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1/*
2 * SPI bus driver for the Topcliff PCH used by Intel SoCs
3 *
4 * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#include <linux/delay.h>
21#include <linux/pci.h>
22#include <linux/wait.h>
23#include <linux/spi/spi.h>
24#include <linux/interrupt.h>
25#include <linux/sched.h>
26#include <linux/spi/spidev.h>
27#include <linux/module.h>
28#include <linux/device.h>
29#include <linux/platform_device.h>
30
31#include <linux/dmaengine.h>
32#include <linux/pch_dma.h>
33
34/* Register offsets */
35#define PCH_SPCR 0x00 /* SPI control register */
36#define PCH_SPBRR 0x04 /* SPI baud rate register */
37#define PCH_SPSR 0x08 /* SPI status register */
38#define PCH_SPDWR 0x0C /* SPI write data register */
39#define PCH_SPDRR 0x10 /* SPI read data register */
40#define PCH_SSNXCR 0x18 /* SSN Expand Control Register */
41#define PCH_SRST 0x1C /* SPI reset register */
42#define PCH_ADDRESS_SIZE 0x20
43
44#define PCH_SPSR_TFD 0x000007C0
45#define PCH_SPSR_RFD 0x0000F800
46
47#define PCH_READABLE(x) (((x) & PCH_SPSR_RFD)>>11)
48#define PCH_WRITABLE(x) (((x) & PCH_SPSR_TFD)>>6)
49
50#define PCH_RX_THOLD 7
51#define PCH_RX_THOLD_MAX 15
52
53#define PCH_TX_THOLD 2
54
55#define PCH_MAX_BAUDRATE 5000000
56#define PCH_MAX_FIFO_DEPTH 16
57
58#define STATUS_RUNNING 1
59#define STATUS_EXITING 2
60#define PCH_SLEEP_TIME 10
61
62#define SSN_LOW 0x02U
63#define SSN_HIGH 0x03U
64#define SSN_NO_CONTROL 0x00U
65#define PCH_MAX_CS 0xFF
66#define PCI_DEVICE_ID_GE_SPI 0x8816
67
68#define SPCR_SPE_BIT (1 << 0)
69#define SPCR_MSTR_BIT (1 << 1)
70#define SPCR_LSBF_BIT (1 << 4)
71#define SPCR_CPHA_BIT (1 << 5)
72#define SPCR_CPOL_BIT (1 << 6)
73#define SPCR_TFIE_BIT (1 << 8)
74#define SPCR_RFIE_BIT (1 << 9)
75#define SPCR_FIE_BIT (1 << 10)
76#define SPCR_ORIE_BIT (1 << 11)
77#define SPCR_MDFIE_BIT (1 << 12)
78#define SPCR_FICLR_BIT (1 << 24)
79#define SPSR_TFI_BIT (1 << 0)
80#define SPSR_RFI_BIT (1 << 1)
81#define SPSR_FI_BIT (1 << 2)
82#define SPSR_ORF_BIT (1 << 3)
83#define SPBRR_SIZE_BIT (1 << 10)
84
85#define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|\
86 SPCR_ORIE_BIT|SPCR_MDFIE_BIT)
87
88#define SPCR_RFIC_FIELD 20
89#define SPCR_TFIC_FIELD 16
90
91#define MASK_SPBRR_SPBR_BITS ((1 << 10) - 1)
92#define MASK_RFIC_SPCR_BITS (0xf << SPCR_RFIC_FIELD)
93#define MASK_TFIC_SPCR_BITS (0xf << SPCR_TFIC_FIELD)
94
95#define PCH_CLOCK_HZ 50000000
96#define PCH_MAX_SPBR 1023
97
98/* Definition for ML7213/ML7223/ML7831 by LAPIS Semiconductor */
99#define PCI_VENDOR_ID_ROHM 0x10DB
100#define PCI_DEVICE_ID_ML7213_SPI 0x802c
101#define PCI_DEVICE_ID_ML7223_SPI 0x800F
102#define PCI_DEVICE_ID_ML7831_SPI 0x8816
103
104/*
105 * Set the number of SPI instance max
106 * Intel EG20T PCH : 1ch
107 * LAPIS Semiconductor ML7213 IOH : 2ch
108 * LAPIS Semiconductor ML7223 IOH : 1ch
109 * LAPIS Semiconductor ML7831 IOH : 1ch
110*/
111#define PCH_SPI_MAX_DEV 2
112
113#define PCH_BUF_SIZE 4096
114#define PCH_DMA_TRANS_SIZE 12
115
116static int use_dma = 1;
117
118struct pch_spi_dma_ctrl {
119 struct dma_async_tx_descriptor *desc_tx;
120 struct dma_async_tx_descriptor *desc_rx;
121 struct pch_dma_slave param_tx;
122 struct pch_dma_slave param_rx;
123 struct dma_chan *chan_tx;
124 struct dma_chan *chan_rx;
125 struct scatterlist *sg_tx_p;
126 struct scatterlist *sg_rx_p;
127 struct scatterlist sg_tx;
128 struct scatterlist sg_rx;
129 int nent;
130 void *tx_buf_virt;
131 void *rx_buf_virt;
132 dma_addr_t tx_buf_dma;
133 dma_addr_t rx_buf_dma;
134};
135/**
136 * struct pch_spi_data - Holds the SPI channel specific details
137 * @io_remap_addr: The remapped PCI base address
138 * @master: Pointer to the SPI master structure
139 * @work: Reference to work queue handler
140 * @wk: Workqueue for carrying out execution of the
141 * requests
142 * @wait: Wait queue for waking up upon receiving an
143 * interrupt.
144 * @transfer_complete: Status of SPI Transfer
145 * @bcurrent_msg_processing: Status flag for message processing
146 * @lock: Lock for protecting this structure
147 * @queue: SPI Message queue
148 * @status: Status of the SPI driver
149 * @bpw_len: Length of data to be transferred in bits per
150 * word
151 * @transfer_active: Flag showing active transfer
152 * @tx_index: Transmit data count; for bookkeeping during
153 * transfer
154 * @rx_index: Receive data count; for bookkeeping during
155 * transfer
156 * @tx_buff: Buffer for data to be transmitted
157 * @rx_index: Buffer for Received data
158 * @n_curnt_chip: The chip number that this SPI driver currently
159 * operates on
160 * @current_chip: Reference to the current chip that this SPI
161 * driver currently operates on
162 * @current_msg: The current message that this SPI driver is
163 * handling
164 * @cur_trans: The current transfer that this SPI driver is
165 * handling
166 * @board_dat: Reference to the SPI device data structure
167 * @plat_dev: platform_device structure
168 * @ch: SPI channel number
169 * @irq_reg_sts: Status of IRQ registration
170 */
171struct pch_spi_data {
172 void __iomem *io_remap_addr;
173 unsigned long io_base_addr;
174 struct spi_master *master;
175 struct work_struct work;
176 struct workqueue_struct *wk;
177 wait_queue_head_t wait;
178 u8 transfer_complete;
179 u8 bcurrent_msg_processing;
180 spinlock_t lock;
181 struct list_head queue;
182 u8 status;
183 u32 bpw_len;
184 u8 transfer_active;
185 u32 tx_index;
186 u32 rx_index;
187 u16 *pkt_tx_buff;
188 u16 *pkt_rx_buff;
189 u8 n_curnt_chip;
190 struct spi_device *current_chip;
191 struct spi_message *current_msg;
192 struct spi_transfer *cur_trans;
193 struct pch_spi_board_data *board_dat;
194 struct platform_device *plat_dev;
195 int ch;
196 struct pch_spi_dma_ctrl dma;
197 int use_dma;
198 u8 irq_reg_sts;
199 int save_total_len;
200};
201
202/**
203 * struct pch_spi_board_data - Holds the SPI device specific details
204 * @pdev: Pointer to the PCI device
205 * @suspend_sts: Status of suspend
206 * @num: The number of SPI device instance
207 */
208struct pch_spi_board_data {
209 struct pci_dev *pdev;
210 u8 suspend_sts;
211 int num;
212};
213
214struct pch_pd_dev_save {
215 int num;
216 struct platform_device *pd_save[PCH_SPI_MAX_DEV];
217 struct pch_spi_board_data *board_dat;
218};
219
220static DEFINE_PCI_DEVICE_TABLE(pch_spi_pcidev_id) = {
221 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI), 1, },
222 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, },
223 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_SPI), 1, },
224 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_SPI), 1, },
225 { }
226};
227
228/**
229 * pch_spi_writereg() - Performs register writes
230 * @master: Pointer to struct spi_master.
231 * @idx: Register offset.
232 * @val: Value to be written to register.
233 */
234static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val)
235{
236 struct pch_spi_data *data = spi_master_get_devdata(master);
237 iowrite32(val, (data->io_remap_addr + idx));
238}
239
240/**
241 * pch_spi_readreg() - Performs register reads
242 * @master: Pointer to struct spi_master.
243 * @idx: Register offset.
244 */
245static inline u32 pch_spi_readreg(struct spi_master *master, int idx)
246{
247 struct pch_spi_data *data = spi_master_get_devdata(master);
248 return ioread32(data->io_remap_addr + idx);
249}
250
251static inline void pch_spi_setclr_reg(struct spi_master *master, int idx,
252 u32 set, u32 clr)
253{
254 u32 tmp = pch_spi_readreg(master, idx);
255 tmp = (tmp & ~clr) | set;
256 pch_spi_writereg(master, idx, tmp);
257}
258
259static void pch_spi_set_master_mode(struct spi_master *master)
260{
261 pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0);
262}
263
264/**
265 * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs
266 * @master: Pointer to struct spi_master.
267 */
268static void pch_spi_clear_fifo(struct spi_master *master)
269{
270 pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0);
271 pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT);
272}
273
274static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
275 void __iomem *io_remap_addr)
276{
277 u32 n_read, tx_index, rx_index, bpw_len;
278 u16 *pkt_rx_buffer, *pkt_tx_buff;
279 int read_cnt;
280 u32 reg_spcr_val;
281 void __iomem *spsr;
282 void __iomem *spdrr;
283 void __iomem *spdwr;
284
285 spsr = io_remap_addr + PCH_SPSR;
286 iowrite32(reg_spsr_val, spsr);
287
288 if (data->transfer_active) {
289 rx_index = data->rx_index;
290 tx_index = data->tx_index;
291 bpw_len = data->bpw_len;
292 pkt_rx_buffer = data->pkt_rx_buff;
293 pkt_tx_buff = data->pkt_tx_buff;
294
295 spdrr = io_remap_addr + PCH_SPDRR;
296 spdwr = io_remap_addr + PCH_SPDWR;
297
298 n_read = PCH_READABLE(reg_spsr_val);
299
300 for (read_cnt = 0; (read_cnt < n_read); read_cnt++) {
301 pkt_rx_buffer[rx_index++] = ioread32(spdrr);
302 if (tx_index < bpw_len)
303 iowrite32(pkt_tx_buff[tx_index++], spdwr);
304 }
305
306 /* disable RFI if not needed */
307 if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) {
308 reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR);
309 reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */
310
311 /* reset rx threshold */
312 reg_spcr_val &= ~MASK_RFIC_SPCR_BITS;
313 reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD);
314
315 iowrite32(reg_spcr_val, (io_remap_addr + PCH_SPCR));
316 }
317
318 /* update counts */
319 data->tx_index = tx_index;
320 data->rx_index = rx_index;
321
322 /* if transfer complete interrupt */
323 if (reg_spsr_val & SPSR_FI_BIT) {
324 if ((tx_index == bpw_len) && (rx_index == tx_index)) {
325 /* disable interrupts */
326 pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
327 PCH_ALL);
328
329 /* transfer is completed;
330 inform pch_spi_process_messages */
331 data->transfer_complete = true;
332 data->transfer_active = false;
333 wake_up(&data->wait);
334 } else {
335 dev_err(&data->master->dev,
336 "%s : Transfer is not completed",
337 __func__);
338 }
339 }
340 }
341}
342
343/**
344 * pch_spi_handler() - Interrupt handler
345 * @irq: The interrupt number.
346 * @dev_id: Pointer to struct pch_spi_board_data.
347 */
348static irqreturn_t pch_spi_handler(int irq, void *dev_id)
349{
350 u32 reg_spsr_val;
351 void __iomem *spsr;
352 void __iomem *io_remap_addr;
353 irqreturn_t ret = IRQ_NONE;
354 struct pch_spi_data *data = dev_id;
355 struct pch_spi_board_data *board_dat = data->board_dat;
356
357 if (board_dat->suspend_sts) {
358 dev_dbg(&board_dat->pdev->dev,
359 "%s returning due to suspend\n", __func__);
360 return IRQ_NONE;
361 }
362
363 io_remap_addr = data->io_remap_addr;
364 spsr = io_remap_addr + PCH_SPSR;
365
366 reg_spsr_val = ioread32(spsr);
367
368 if (reg_spsr_val & SPSR_ORF_BIT) {
369 dev_err(&board_dat->pdev->dev, "%s Over run error\n", __func__);
370 if (data->current_msg->complete != 0) {
371 data->transfer_complete = true;
372 data->current_msg->status = -EIO;
373 data->current_msg->complete(data->current_msg->context);
374 data->bcurrent_msg_processing = false;
375 data->current_msg = NULL;
376 data->cur_trans = NULL;
377 }
378 }
379
380 if (data->use_dma)
381 return IRQ_NONE;
382
383 /* Check if the interrupt is for SPI device */
384 if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) {
385 pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr);
386 ret = IRQ_HANDLED;
387 }
388
389 dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n",
390 __func__, ret);
391
392 return ret;
393}
394
395/**
396 * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR
397 * @master: Pointer to struct spi_master.
398 * @speed_hz: Baud rate.
399 */
400static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz)
401{
402 u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2);
403
404 /* if baud rate is less than we can support limit it */
405 if (n_spbr > PCH_MAX_SPBR)
406 n_spbr = PCH_MAX_SPBR;
407
408 pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, MASK_SPBRR_SPBR_BITS);
409}
410
411/**
412 * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR
413 * @master: Pointer to struct spi_master.
414 * @bits_per_word: Bits per word for SPI transfer.
415 */
416static void pch_spi_set_bits_per_word(struct spi_master *master,
417 u8 bits_per_word)
418{
419 if (bits_per_word == 8)
420 pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT);
421 else
422 pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0);
423}
424
425/**
426 * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer
427 * @spi: Pointer to struct spi_device.
428 */
429static void pch_spi_setup_transfer(struct spi_device *spi)
430{
431 u32 flags = 0;
432
433 dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n",
434 __func__, pch_spi_readreg(spi->master, PCH_SPBRR),
435 spi->max_speed_hz);
436 pch_spi_set_baud_rate(spi->master, spi->max_speed_hz);
437
438 /* set bits per word */
439 pch_spi_set_bits_per_word(spi->master, spi->bits_per_word);
440
441 if (!(spi->mode & SPI_LSB_FIRST))
442 flags |= SPCR_LSBF_BIT;
443 if (spi->mode & SPI_CPOL)
444 flags |= SPCR_CPOL_BIT;
445 if (spi->mode & SPI_CPHA)
446 flags |= SPCR_CPHA_BIT;
447 pch_spi_setclr_reg(spi->master, PCH_SPCR, flags,
448 (SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT));
449
450 /* Clear the FIFO by toggling FICLR to 1 and back to 0 */
451 pch_spi_clear_fifo(spi->master);
452}
453
454/**
455 * pch_spi_reset() - Clears SPI registers
456 * @master: Pointer to struct spi_master.
457 */
458static void pch_spi_reset(struct spi_master *master)
459{
460 /* write 1 to reset SPI */
461 pch_spi_writereg(master, PCH_SRST, 0x1);
462
463 /* clear reset */
464 pch_spi_writereg(master, PCH_SRST, 0x0);
465}
466
467static int pch_spi_setup(struct spi_device *pspi)
468{
469 /* check bits per word */
470 if (pspi->bits_per_word == 0) {
471 pspi->bits_per_word = 8;
472 dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__);
473 }
474
475 if ((pspi->bits_per_word != 8) && (pspi->bits_per_word != 16)) {
476 dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__);
477 return -EINVAL;
478 }
479
480 /* Check baud rate setting */
481 /* if baud rate of chip is greater than
482 max we can support,return error */
483 if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE)
484 pspi->max_speed_hz = PCH_MAX_BAUDRATE;
485
486 dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__,
487 (pspi->mode) & (SPI_CPOL | SPI_CPHA));
488
489 return 0;
490}
491
492static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
493{
494
495 struct spi_transfer *transfer;
496 struct pch_spi_data *data = spi_master_get_devdata(pspi->master);
497 int retval;
498 unsigned long flags;
499
500 /* validate spi message and baud rate */
501 if (unlikely(list_empty(&pmsg->transfers) == 1)) {
502 dev_err(&pspi->dev, "%s list empty\n", __func__);
503 retval = -EINVAL;
504 goto err_out;
505 }
506
507 if (unlikely(pspi->max_speed_hz == 0)) {
508 dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n",
509 __func__, pspi->max_speed_hz);
510 retval = -EINVAL;
511 goto err_out;
512 }
513
514 dev_dbg(&pspi->dev, "%s Transfer List not empty. "
515 "Transfer Speed is set.\n", __func__);
516
517 spin_lock_irqsave(&data->lock, flags);
518 /* validate Tx/Rx buffers and Transfer length */
519 list_for_each_entry(transfer, &pmsg->transfers, transfer_list) {
520 if (!transfer->tx_buf && !transfer->rx_buf) {
521 dev_err(&pspi->dev,
522 "%s Tx and Rx buffer NULL\n", __func__);
523 retval = -EINVAL;
524 goto err_return_spinlock;
525 }
526
527 if (!transfer->len) {
528 dev_err(&pspi->dev, "%s Transfer length invalid\n",
529 __func__);
530 retval = -EINVAL;
531 goto err_return_spinlock;
532 }
533
534 dev_dbg(&pspi->dev, "%s Tx/Rx buffer valid. Transfer length"
535 " valid\n", __func__);
536
537 /* if baud rate has been specified validate the same */
538 if (transfer->speed_hz > PCH_MAX_BAUDRATE)
539 transfer->speed_hz = PCH_MAX_BAUDRATE;
540
541 /* if bits per word has been specified validate the same */
542 if (transfer->bits_per_word) {
543 if ((transfer->bits_per_word != 8)
544 && (transfer->bits_per_word != 16)) {
545 retval = -EINVAL;
546 dev_err(&pspi->dev,
547 "%s Invalid bits per word\n", __func__);
548 goto err_return_spinlock;
549 }
550 }
551 }
552 spin_unlock_irqrestore(&data->lock, flags);
553
554 /* We won't process any messages if we have been asked to terminate */
555 if (data->status == STATUS_EXITING) {
556 dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__);
557 retval = -ESHUTDOWN;
558 goto err_out;
559 }
560
561 /* If suspended ,return -EINVAL */
562 if (data->board_dat->suspend_sts) {
563 dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__);
564 retval = -EINVAL;
565 goto err_out;
566 }
567
568 /* set status of message */
569 pmsg->actual_length = 0;
570 dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status);
571
572 pmsg->status = -EINPROGRESS;
573 spin_lock_irqsave(&data->lock, flags);
574 /* add message to queue */
575 list_add_tail(&pmsg->queue, &data->queue);
576 spin_unlock_irqrestore(&data->lock, flags);
577
578 dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
579
580 /* schedule work queue to run */
581 queue_work(data->wk, &data->work);
582 dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
583
584 retval = 0;
585
586err_out:
587 dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
588 return retval;
589err_return_spinlock:
590 dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
591 spin_unlock_irqrestore(&data->lock, flags);
592 return retval;
593}
594
595static inline void pch_spi_select_chip(struct pch_spi_data *data,
596 struct spi_device *pspi)
597{
598 if (data->current_chip != NULL) {
599 if (pspi->chip_select != data->n_curnt_chip) {
600 dev_dbg(&pspi->dev, "%s : different slave\n", __func__);
601 data->current_chip = NULL;
602 }
603 }
604
605 data->current_chip = pspi;
606
607 data->n_curnt_chip = data->current_chip->chip_select;
608
609 dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__);
610 pch_spi_setup_transfer(pspi);
611}
612
613static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw)
614{
615 int size;
616 u32 n_writes;
617 int j;
618 struct spi_message *pmsg;
619 const u8 *tx_buf;
620 const u16 *tx_sbuf;
621
622 /* set baud rate if needed */
623 if (data->cur_trans->speed_hz) {
624 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
625 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
626 }
627
628 /* set bits per word if needed */
629 if (data->cur_trans->bits_per_word &&
630 (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) {
631 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
632 pch_spi_set_bits_per_word(data->master,
633 data->cur_trans->bits_per_word);
634 *bpw = data->cur_trans->bits_per_word;
635 } else {
636 *bpw = data->current_msg->spi->bits_per_word;
637 }
638
639 /* reset Tx/Rx index */
640 data->tx_index = 0;
641 data->rx_index = 0;
642
643 data->bpw_len = data->cur_trans->len / (*bpw / 8);
644
645 /* find alloc size */
646 size = data->cur_trans->len * sizeof(*data->pkt_tx_buff);
647
648 /* allocate memory for pkt_tx_buff & pkt_rx_buffer */
649 data->pkt_tx_buff = kzalloc(size, GFP_KERNEL);
650 if (data->pkt_tx_buff != NULL) {
651 data->pkt_rx_buff = kzalloc(size, GFP_KERNEL);
652 if (!data->pkt_rx_buff)
653 kfree(data->pkt_tx_buff);
654 }
655
656 if (!data->pkt_rx_buff) {
657 /* flush queue and set status of all transfers to -ENOMEM */
658 dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__);
659 list_for_each_entry(pmsg, data->queue.next, queue) {
660 pmsg->status = -ENOMEM;
661
662 if (pmsg->complete != 0)
663 pmsg->complete(pmsg->context);
664
665 /* delete from queue */
666 list_del_init(&pmsg->queue);
667 }
668 return;
669 }
670
671 /* copy Tx Data */
672 if (data->cur_trans->tx_buf != NULL) {
673 if (*bpw == 8) {
674 tx_buf = data->cur_trans->tx_buf;
675 for (j = 0; j < data->bpw_len; j++)
676 data->pkt_tx_buff[j] = *tx_buf++;
677 } else {
678 tx_sbuf = data->cur_trans->tx_buf;
679 for (j = 0; j < data->bpw_len; j++)
680 data->pkt_tx_buff[j] = *tx_sbuf++;
681 }
682 }
683
684 /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */
685 n_writes = data->bpw_len;
686 if (n_writes > PCH_MAX_FIFO_DEPTH)
687 n_writes = PCH_MAX_FIFO_DEPTH;
688
689 dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
690 "0x2 to SSNXCR\n", __func__);
691 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
692
693 for (j = 0; j < n_writes; j++)
694 pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]);
695
696 /* update tx_index */
697 data->tx_index = j;
698
699 /* reset transfer complete flag */
700 data->transfer_complete = false;
701 data->transfer_active = true;
702}
703
704static void pch_spi_nomore_transfer(struct pch_spi_data *data)
705{
706 struct spi_message *pmsg;
707 dev_dbg(&data->master->dev, "%s called\n", __func__);
708 /* Invoke complete callback
709 * [To the spi core..indicating end of transfer] */
710 data->current_msg->status = 0;
711
712 if (data->current_msg->complete != 0) {
713 dev_dbg(&data->master->dev,
714 "%s:Invoking callback of SPI core\n", __func__);
715 data->current_msg->complete(data->current_msg->context);
716 }
717
718 /* update status in global variable */
719 data->bcurrent_msg_processing = false;
720
721 dev_dbg(&data->master->dev,
722 "%s:data->bcurrent_msg_processing = false\n", __func__);
723
724 data->current_msg = NULL;
725 data->cur_trans = NULL;
726
727 /* check if we have items in list and not suspending
728 * return 1 if list empty */
729 if ((list_empty(&data->queue) == 0) &&
730 (!data->board_dat->suspend_sts) &&
731 (data->status != STATUS_EXITING)) {
732 /* We have some more work to do (either there is more tranint
733 * bpw;sfer requests in the current message or there are
734 *more messages)
735 */
736 dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__);
737 queue_work(data->wk, &data->work);
738 } else if (data->board_dat->suspend_sts ||
739 data->status == STATUS_EXITING) {
740 dev_dbg(&data->master->dev,
741 "%s suspend/remove initiated, flushing queue\n",
742 __func__);
743 list_for_each_entry(pmsg, data->queue.next, queue) {
744 pmsg->status = -EIO;
745
746 if (pmsg->complete)
747 pmsg->complete(pmsg->context);
748
749 /* delete from queue */
750 list_del_init(&pmsg->queue);
751 }
752 }
753}
754
755static void pch_spi_set_ir(struct pch_spi_data *data)
756{
757 /* enable interrupts, set threshold, enable SPI */
758 if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH)
759 /* set receive threshold to PCH_RX_THOLD */
760 pch_spi_setclr_reg(data->master, PCH_SPCR,
761 PCH_RX_THOLD << SPCR_RFIC_FIELD |
762 SPCR_FIE_BIT | SPCR_RFIE_BIT |
763 SPCR_ORIE_BIT | SPCR_SPE_BIT,
764 MASK_RFIC_SPCR_BITS | PCH_ALL);
765 else
766 /* set receive threshold to maximum */
767 pch_spi_setclr_reg(data->master, PCH_SPCR,
768 PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD |
769 SPCR_FIE_BIT | SPCR_ORIE_BIT |
770 SPCR_SPE_BIT,
771 MASK_RFIC_SPCR_BITS | PCH_ALL);
772
773 /* Wait until the transfer completes; go to sleep after
774 initiating the transfer. */
775 dev_dbg(&data->master->dev,
776 "%s:waiting for transfer to get over\n", __func__);
777
778 wait_event_interruptible(data->wait, data->transfer_complete);
779
780 /* clear all interrupts */
781 pch_spi_writereg(data->master, PCH_SPSR,
782 pch_spi_readreg(data->master, PCH_SPSR));
783 /* Disable interrupts and SPI transfer */
784 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT);
785 /* clear FIFO */
786 pch_spi_clear_fifo(data->master);
787}
788
789static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
790{
791 int j;
792 u8 *rx_buf;
793 u16 *rx_sbuf;
794
795 /* copy Rx Data */
796 if (!data->cur_trans->rx_buf)
797 return;
798
799 if (bpw == 8) {
800 rx_buf = data->cur_trans->rx_buf;
801 for (j = 0; j < data->bpw_len; j++)
802 *rx_buf++ = data->pkt_rx_buff[j] & 0xFF;
803 } else {
804 rx_sbuf = data->cur_trans->rx_buf;
805 for (j = 0; j < data->bpw_len; j++)
806 *rx_sbuf++ = data->pkt_rx_buff[j];
807 }
808}
809
810static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw)
811{
812 int j;
813 u8 *rx_buf;
814 u16 *rx_sbuf;
815 const u8 *rx_dma_buf;
816 const u16 *rx_dma_sbuf;
817
818 /* copy Rx Data */
819 if (!data->cur_trans->rx_buf)
820 return;
821
822 if (bpw == 8) {
823 rx_buf = data->cur_trans->rx_buf;
824 rx_dma_buf = data->dma.rx_buf_virt;
825 for (j = 0; j < data->bpw_len; j++)
826 *rx_buf++ = *rx_dma_buf++ & 0xFF;
827 data->cur_trans->rx_buf = rx_buf;
828 } else {
829 rx_sbuf = data->cur_trans->rx_buf;
830 rx_dma_sbuf = data->dma.rx_buf_virt;
831 for (j = 0; j < data->bpw_len; j++)
832 *rx_sbuf++ = *rx_dma_sbuf++;
833 data->cur_trans->rx_buf = rx_sbuf;
834 }
835}
836
837static int pch_spi_start_transfer(struct pch_spi_data *data)
838{
839 struct pch_spi_dma_ctrl *dma;
840 unsigned long flags;
841 int rtn;
842
843 dma = &data->dma;
844
845 spin_lock_irqsave(&data->lock, flags);
846
847 /* disable interrupts, SPI set enable */
848 pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL);
849
850 spin_unlock_irqrestore(&data->lock, flags);
851
852 /* Wait until the transfer completes; go to sleep after
853 initiating the transfer. */
854 dev_dbg(&data->master->dev,
855 "%s:waiting for transfer to get over\n", __func__);
856 rtn = wait_event_interruptible_timeout(data->wait,
857 data->transfer_complete,
858 msecs_to_jiffies(2 * HZ));
859 if (!rtn)
860 dev_err(&data->master->dev,
861 "%s wait-event timeout\n", __func__);
862
863 dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent,
864 DMA_FROM_DEVICE);
865
866 dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent,
867 DMA_FROM_DEVICE);
868 memset(data->dma.tx_buf_virt, 0, PAGE_SIZE);
869
870 async_tx_ack(dma->desc_rx);
871 async_tx_ack(dma->desc_tx);
872 kfree(dma->sg_tx_p);
873 kfree(dma->sg_rx_p);
874
875 spin_lock_irqsave(&data->lock, flags);
876
877 /* clear fifo threshold, disable interrupts, disable SPI transfer */
878 pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
879 MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS | PCH_ALL |
880 SPCR_SPE_BIT);
881 /* clear all interrupts */
882 pch_spi_writereg(data->master, PCH_SPSR,
883 pch_spi_readreg(data->master, PCH_SPSR));
884 /* clear FIFO */
885 pch_spi_clear_fifo(data->master);
886
887 spin_unlock_irqrestore(&data->lock, flags);
888
889 return rtn;
890}
891
892static void pch_dma_rx_complete(void *arg)
893{
894 struct pch_spi_data *data = arg;
895
896 /* transfer is completed;inform pch_spi_process_messages_dma */
897 data->transfer_complete = true;
898 wake_up_interruptible(&data->wait);
899}
900
901static bool pch_spi_filter(struct dma_chan *chan, void *slave)
902{
903 struct pch_dma_slave *param = slave;
904
905 if ((chan->chan_id == param->chan_id) &&
906 (param->dma_dev == chan->device->dev)) {
907 chan->private = param;
908 return true;
909 } else {
910 return false;
911 }
912}
913
914static void pch_spi_request_dma(struct pch_spi_data *data, int bpw)
915{
916 dma_cap_mask_t mask;
917 struct dma_chan *chan;
918 struct pci_dev *dma_dev;
919 struct pch_dma_slave *param;
920 struct pch_spi_dma_ctrl *dma;
921 unsigned int width;
922
923 if (bpw == 8)
924 width = PCH_DMA_WIDTH_1_BYTE;
925 else
926 width = PCH_DMA_WIDTH_2_BYTES;
927
928 dma = &data->dma;
929 dma_cap_zero(mask);
930 dma_cap_set(DMA_SLAVE, mask);
931
932 /* Get DMA's dev information */
933 dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number,
934 PCI_DEVFN(12, 0));
935
936 /* Set Tx DMA */
937 param = &dma->param_tx;
938 param->dma_dev = &dma_dev->dev;
939 param->chan_id = data->master->bus_num * 2; /* Tx = 0, 2 */
940 param->tx_reg = data->io_base_addr + PCH_SPDWR;
941 param->width = width;
942 chan = dma_request_channel(mask, pch_spi_filter, param);
943 if (!chan) {
944 dev_err(&data->master->dev,
945 "ERROR: dma_request_channel FAILS(Tx)\n");
946 data->use_dma = 0;
947 return;
948 }
949 dma->chan_tx = chan;
950
951 /* Set Rx DMA */
952 param = &dma->param_rx;
953 param->dma_dev = &dma_dev->dev;
954 param->chan_id = data->master->bus_num * 2 + 1; /* Rx = Tx + 1 */
955 param->rx_reg = data->io_base_addr + PCH_SPDRR;
956 param->width = width;
957 chan = dma_request_channel(mask, pch_spi_filter, param);
958 if (!chan) {
959 dev_err(&data->master->dev,
960 "ERROR: dma_request_channel FAILS(Rx)\n");
961 dma_release_channel(dma->chan_tx);
962 dma->chan_tx = NULL;
963 data->use_dma = 0;
964 return;
965 }
966 dma->chan_rx = chan;
967}
968
969static void pch_spi_release_dma(struct pch_spi_data *data)
970{
971 struct pch_spi_dma_ctrl *dma;
972
973 dma = &data->dma;
974 if (dma->chan_tx) {
975 dma_release_channel(dma->chan_tx);
976 dma->chan_tx = NULL;
977 }
978 if (dma->chan_rx) {
979 dma_release_channel(dma->chan_rx);
980 dma->chan_rx = NULL;
981 }
982 return;
983}
984
985static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
986{
987 const u8 *tx_buf;
988 const u16 *tx_sbuf;
989 u8 *tx_dma_buf;
990 u16 *tx_dma_sbuf;
991 struct scatterlist *sg;
992 struct dma_async_tx_descriptor *desc_tx;
993 struct dma_async_tx_descriptor *desc_rx;
994 int num;
995 int i;
996 int size;
997 int rem;
998 int head;
999 unsigned long flags;
1000 struct pch_spi_dma_ctrl *dma;
1001
1002 dma = &data->dma;
1003
1004 /* set baud rate if needed */
1005 if (data->cur_trans->speed_hz) {
1006 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
1007 spin_lock_irqsave(&data->lock, flags);
1008 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
1009 spin_unlock_irqrestore(&data->lock, flags);
1010 }
1011
1012 /* set bits per word if needed */
1013 if (data->cur_trans->bits_per_word &&
1014 (data->current_msg->spi->bits_per_word !=
1015 data->cur_trans->bits_per_word)) {
1016 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
1017 spin_lock_irqsave(&data->lock, flags);
1018 pch_spi_set_bits_per_word(data->master,
1019 data->cur_trans->bits_per_word);
1020 spin_unlock_irqrestore(&data->lock, flags);
1021 *bpw = data->cur_trans->bits_per_word;
1022 } else {
1023 *bpw = data->current_msg->spi->bits_per_word;
1024 }
1025 data->bpw_len = data->cur_trans->len / (*bpw / 8);
1026
1027 if (data->bpw_len > PCH_BUF_SIZE) {
1028 data->bpw_len = PCH_BUF_SIZE;
1029 data->cur_trans->len -= PCH_BUF_SIZE;
1030 }
1031
1032 /* copy Tx Data */
1033 if (data->cur_trans->tx_buf != NULL) {
1034 if (*bpw == 8) {
1035 tx_buf = data->cur_trans->tx_buf;
1036 tx_dma_buf = dma->tx_buf_virt;
1037 for (i = 0; i < data->bpw_len; i++)
1038 *tx_dma_buf++ = *tx_buf++;
1039 } else {
1040 tx_sbuf = data->cur_trans->tx_buf;
1041 tx_dma_sbuf = dma->tx_buf_virt;
1042 for (i = 0; i < data->bpw_len; i++)
1043 *tx_dma_sbuf++ = *tx_sbuf++;
1044 }
1045 }
1046
1047 /* Calculate Rx parameter for DMA transmitting */
1048 if (data->bpw_len > PCH_DMA_TRANS_SIZE) {
1049 if (data->bpw_len % PCH_DMA_TRANS_SIZE) {
1050 num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
1051 rem = data->bpw_len % PCH_DMA_TRANS_SIZE;
1052 } else {
1053 num = data->bpw_len / PCH_DMA_TRANS_SIZE;
1054 rem = PCH_DMA_TRANS_SIZE;
1055 }
1056 size = PCH_DMA_TRANS_SIZE;
1057 } else {
1058 num = 1;
1059 size = data->bpw_len;
1060 rem = data->bpw_len;
1061 }
1062 dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n",
1063 __func__, num, size, rem);
1064 spin_lock_irqsave(&data->lock, flags);
1065
1066 /* set receive fifo threshold and transmit fifo threshold */
1067 pch_spi_setclr_reg(data->master, PCH_SPCR,
1068 ((size - 1) << SPCR_RFIC_FIELD) |
1069 (PCH_TX_THOLD << SPCR_TFIC_FIELD),
1070 MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS);
1071
1072 spin_unlock_irqrestore(&data->lock, flags);
1073
1074 /* RX */
1075 dma->sg_rx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1076 sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */
1077 /* offset, length setting */
1078 sg = dma->sg_rx_p;
1079 for (i = 0; i < num; i++, sg++) {
1080 if (i == (num - 2)) {
1081 sg->offset = size * i;
1082 sg->offset = sg->offset * (*bpw / 8);
1083 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem,
1084 sg->offset);
1085 sg_dma_len(sg) = rem;
1086 } else if (i == (num - 1)) {
1087 sg->offset = size * (i - 1) + rem;
1088 sg->offset = sg->offset * (*bpw / 8);
1089 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size,
1090 sg->offset);
1091 sg_dma_len(sg) = size;
1092 } else {
1093 sg->offset = size * i;
1094 sg->offset = sg->offset * (*bpw / 8);
1095 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size,
1096 sg->offset);
1097 sg_dma_len(sg) = size;
1098 }
1099 sg_dma_address(sg) = dma->rx_buf_dma + sg->offset;
1100 }
1101 sg = dma->sg_rx_p;
1102 desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg,
1103 num, DMA_DEV_TO_MEM,
1104 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1105 if (!desc_rx) {
1106 dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
1107 __func__);
1108 return;
1109 }
1110 dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE);
1111 desc_rx->callback = pch_dma_rx_complete;
1112 desc_rx->callback_param = data;
1113 dma->nent = num;
1114 dma->desc_rx = desc_rx;
1115
1116 /* Calculate Tx parameter for DMA transmitting */
1117 if (data->bpw_len > PCH_MAX_FIFO_DEPTH) {
1118 head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE;
1119 if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) {
1120 num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
1121 rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head;
1122 } else {
1123 num = data->bpw_len / PCH_DMA_TRANS_SIZE;
1124 rem = data->bpw_len % PCH_DMA_TRANS_SIZE +
1125 PCH_DMA_TRANS_SIZE - head;
1126 }
1127 size = PCH_DMA_TRANS_SIZE;
1128 } else {
1129 num = 1;
1130 size = data->bpw_len;
1131 rem = data->bpw_len;
1132 head = 0;
1133 }
1134
1135 dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1136 sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */
1137 /* offset, length setting */
1138 sg = dma->sg_tx_p;
1139 for (i = 0; i < num; i++, sg++) {
1140 if (i == 0) {
1141 sg->offset = 0;
1142 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head,
1143 sg->offset);
1144 sg_dma_len(sg) = size + head;
1145 } else if (i == (num - 1)) {
1146 sg->offset = head + size * i;
1147 sg->offset = sg->offset * (*bpw / 8);
1148 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem,
1149 sg->offset);
1150 sg_dma_len(sg) = rem;
1151 } else {
1152 sg->offset = head + size * i;
1153 sg->offset = sg->offset * (*bpw / 8);
1154 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size,
1155 sg->offset);
1156 sg_dma_len(sg) = size;
1157 }
1158 sg_dma_address(sg) = dma->tx_buf_dma + sg->offset;
1159 }
1160 sg = dma->sg_tx_p;
1161 desc_tx = dmaengine_prep_slave_sg(dma->chan_tx,
1162 sg, num, DMA_MEM_TO_DEV,
1163 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1164 if (!desc_tx) {
1165 dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
1166 __func__);
1167 return;
1168 }
1169 dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE);
1170 desc_tx->callback = NULL;
1171 desc_tx->callback_param = data;
1172 dma->nent = num;
1173 dma->desc_tx = desc_tx;
1174
1175 dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
1176 "0x2 to SSNXCR\n", __func__);
1177
1178 spin_lock_irqsave(&data->lock, flags);
1179 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
1180 desc_rx->tx_submit(desc_rx);
1181 desc_tx->tx_submit(desc_tx);
1182 spin_unlock_irqrestore(&data->lock, flags);
1183
1184 /* reset transfer complete flag */
1185 data->transfer_complete = false;
1186}
1187
1188static void pch_spi_process_messages(struct work_struct *pwork)
1189{
1190 struct spi_message *pmsg;
1191 struct pch_spi_data *data;
1192 int bpw;
1193
1194 data = container_of(pwork, struct pch_spi_data, work);
1195 dev_dbg(&data->master->dev, "%s data initialized\n", __func__);
1196
1197 spin_lock(&data->lock);
1198 /* check if suspend has been initiated;if yes flush queue */
1199 if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) {
1200 dev_dbg(&data->master->dev, "%s suspend/remove initiated,"
1201 "flushing queue\n", __func__);
1202 list_for_each_entry(pmsg, data->queue.next, queue) {
1203 pmsg->status = -EIO;
1204
1205 if (pmsg->complete != 0) {
1206 spin_unlock(&data->lock);
1207 pmsg->complete(pmsg->context);
1208 spin_lock(&data->lock);
1209 }
1210
1211 /* delete from queue */
1212 list_del_init(&pmsg->queue);
1213 }
1214
1215 spin_unlock(&data->lock);
1216 return;
1217 }
1218
1219 data->bcurrent_msg_processing = true;
1220 dev_dbg(&data->master->dev,
1221 "%s Set data->bcurrent_msg_processing= true\n", __func__);
1222
1223 /* Get the message from the queue and delete it from there. */
1224 data->current_msg = list_entry(data->queue.next, struct spi_message,
1225 queue);
1226
1227 list_del_init(&data->current_msg->queue);
1228
1229 data->current_msg->status = 0;
1230
1231 pch_spi_select_chip(data, data->current_msg->spi);
1232
1233 spin_unlock(&data->lock);
1234
1235 if (data->use_dma)
1236 pch_spi_request_dma(data,
1237 data->current_msg->spi->bits_per_word);
1238 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
1239 do {
1240 int cnt;
1241 /* If we are already processing a message get the next
1242 transfer structure from the message otherwise retrieve
1243 the 1st transfer request from the message. */
1244 spin_lock(&data->lock);
1245 if (data->cur_trans == NULL) {
1246 data->cur_trans =
1247 list_entry(data->current_msg->transfers.next,
1248 struct spi_transfer, transfer_list);
1249 dev_dbg(&data->master->dev, "%s "
1250 ":Getting 1st transfer message\n", __func__);
1251 } else {
1252 data->cur_trans =
1253 list_entry(data->cur_trans->transfer_list.next,
1254 struct spi_transfer, transfer_list);
1255 dev_dbg(&data->master->dev, "%s "
1256 ":Getting next transfer message\n", __func__);
1257 }
1258 spin_unlock(&data->lock);
1259
1260 if (!data->cur_trans->len)
1261 goto out;
1262 cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1;
1263 data->save_total_len = data->cur_trans->len;
1264 if (data->use_dma) {
1265 int i;
1266 char *save_rx_buf = data->cur_trans->rx_buf;
1267 for (i = 0; i < cnt; i ++) {
1268 pch_spi_handle_dma(data, &bpw);
1269 if (!pch_spi_start_transfer(data)) {
1270 data->transfer_complete = true;
1271 data->current_msg->status = -EIO;
1272 data->current_msg->complete
1273 (data->current_msg->context);
1274 data->bcurrent_msg_processing = false;
1275 data->current_msg = NULL;
1276 data->cur_trans = NULL;
1277 goto out;
1278 }
1279 pch_spi_copy_rx_data_for_dma(data, bpw);
1280 }
1281 data->cur_trans->rx_buf = save_rx_buf;
1282 } else {
1283 pch_spi_set_tx(data, &bpw);
1284 pch_spi_set_ir(data);
1285 pch_spi_copy_rx_data(data, bpw);
1286 kfree(data->pkt_rx_buff);
1287 data->pkt_rx_buff = NULL;
1288 kfree(data->pkt_tx_buff);
1289 data->pkt_tx_buff = NULL;
1290 }
1291 /* increment message count */
1292 data->cur_trans->len = data->save_total_len;
1293 data->current_msg->actual_length += data->cur_trans->len;
1294
1295 dev_dbg(&data->master->dev,
1296 "%s:data->current_msg->actual_length=%d\n",
1297 __func__, data->current_msg->actual_length);
1298
1299 /* check for delay */
1300 if (data->cur_trans->delay_usecs) {
1301 dev_dbg(&data->master->dev, "%s:"
1302 "delay in usec=%d\n", __func__,
1303 data->cur_trans->delay_usecs);
1304 udelay(data->cur_trans->delay_usecs);
1305 }
1306
1307 spin_lock(&data->lock);
1308
1309 /* No more transfer in this message. */
1310 if ((data->cur_trans->transfer_list.next) ==
1311 &(data->current_msg->transfers)) {
1312 pch_spi_nomore_transfer(data);
1313 }
1314
1315 spin_unlock(&data->lock);
1316
1317 } while (data->cur_trans != NULL);
1318
1319out:
1320 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH);
1321 if (data->use_dma)
1322 pch_spi_release_dma(data);
1323}
1324
1325static void pch_spi_free_resources(struct pch_spi_board_data *board_dat,
1326 struct pch_spi_data *data)
1327{
1328 dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1329
1330 /* free workqueue */
1331 if (data->wk != NULL) {
1332 destroy_workqueue(data->wk);
1333 data->wk = NULL;
1334 dev_dbg(&board_dat->pdev->dev,
1335 "%s destroy_workqueue invoked successfully\n",
1336 __func__);
1337 }
1338}
1339
1340static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
1341 struct pch_spi_data *data)
1342{
1343 int retval = 0;
1344
1345 dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1346
1347 /* create workqueue */
1348 data->wk = create_singlethread_workqueue(KBUILD_MODNAME);
1349 if (!data->wk) {
1350 dev_err(&board_dat->pdev->dev,
1351 "%s create_singlet hread_workqueue failed\n", __func__);
1352 retval = -EBUSY;
1353 goto err_return;
1354 }
1355
1356 /* reset PCH SPI h/w */
1357 pch_spi_reset(data->master);
1358 dev_dbg(&board_dat->pdev->dev,
1359 "%s pch_spi_reset invoked successfully\n", __func__);
1360
1361 dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__);
1362
1363err_return:
1364 if (retval != 0) {
1365 dev_err(&board_dat->pdev->dev,
1366 "%s FAIL:invoking pch_spi_free_resources\n", __func__);
1367 pch_spi_free_resources(board_dat, data);
1368 }
1369
1370 dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval);
1371
1372 return retval;
1373}
1374
1375static void pch_free_dma_buf(struct pch_spi_board_data *board_dat,
1376 struct pch_spi_data *data)
1377{
1378 struct pch_spi_dma_ctrl *dma;
1379
1380 dma = &data->dma;
1381 if (dma->tx_buf_dma)
1382 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
1383 dma->tx_buf_virt, dma->tx_buf_dma);
1384 if (dma->rx_buf_dma)
1385 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
1386 dma->rx_buf_virt, dma->rx_buf_dma);
1387 return;
1388}
1389
1390static void pch_alloc_dma_buf(struct pch_spi_board_data *board_dat,
1391 struct pch_spi_data *data)
1392{
1393 struct pch_spi_dma_ctrl *dma;
1394
1395 dma = &data->dma;
1396 /* Get Consistent memory for Tx DMA */
1397 dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev,
1398 PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL);
1399 /* Get Consistent memory for Rx DMA */
1400 dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev,
1401 PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL);
1402}
1403
1404static int __devinit pch_spi_pd_probe(struct platform_device *plat_dev)
1405{
1406 int ret;
1407 struct spi_master *master;
1408 struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev);
1409 struct pch_spi_data *data;
1410
1411 dev_dbg(&plat_dev->dev, "%s:debug\n", __func__);
1412
1413 master = spi_alloc_master(&board_dat->pdev->dev,
1414 sizeof(struct pch_spi_data));
1415 if (!master) {
1416 dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n",
1417 plat_dev->id);
1418 return -ENOMEM;
1419 }
1420
1421 data = spi_master_get_devdata(master);
1422 data->master = master;
1423
1424 platform_set_drvdata(plat_dev, data);
1425
1426 /* baseaddress + address offset) */
1427 data->io_base_addr = pci_resource_start(board_dat->pdev, 1) +
1428 PCH_ADDRESS_SIZE * plat_dev->id;
1429 data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0) +
1430 PCH_ADDRESS_SIZE * plat_dev->id;
1431 if (!data->io_remap_addr) {
1432 dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__);
1433 ret = -ENOMEM;
1434 goto err_pci_iomap;
1435 }
1436
1437 dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n",
1438 plat_dev->id, data->io_remap_addr);
1439
1440 /* initialize members of SPI master */
1441 master->num_chipselect = PCH_MAX_CS;
1442 master->setup = pch_spi_setup;
1443 master->transfer = pch_spi_transfer;
1444 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
1445
1446 data->board_dat = board_dat;
1447 data->plat_dev = plat_dev;
1448 data->n_curnt_chip = 255;
1449 data->status = STATUS_RUNNING;
1450 data->ch = plat_dev->id;
1451 data->use_dma = use_dma;
1452
1453 INIT_LIST_HEAD(&data->queue);
1454 spin_lock_init(&data->lock);
1455 INIT_WORK(&data->work, pch_spi_process_messages);
1456 init_waitqueue_head(&data->wait);
1457
1458 ret = pch_spi_get_resources(board_dat, data);
1459 if (ret) {
1460 dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret);
1461 goto err_spi_get_resources;
1462 }
1463
1464 ret = request_irq(board_dat->pdev->irq, pch_spi_handler,
1465 IRQF_SHARED, KBUILD_MODNAME, data);
1466 if (ret) {
1467 dev_err(&plat_dev->dev,
1468 "%s request_irq failed\n", __func__);
1469 goto err_request_irq;
1470 }
1471 data->irq_reg_sts = true;
1472
1473 pch_spi_set_master_mode(master);
1474
1475 ret = spi_register_master(master);
1476 if (ret != 0) {
1477 dev_err(&plat_dev->dev,
1478 "%s spi_register_master FAILED\n", __func__);
1479 goto err_spi_register_master;
1480 }
1481
1482 if (use_dma) {
1483 dev_info(&plat_dev->dev, "Use DMA for data transfers\n");
1484 pch_alloc_dma_buf(board_dat, data);
1485 }
1486
1487 return 0;
1488
1489err_spi_register_master:
1490 free_irq(board_dat->pdev->irq, board_dat);
1491err_request_irq:
1492 pch_spi_free_resources(board_dat, data);
1493err_spi_get_resources:
1494 pci_iounmap(board_dat->pdev, data->io_remap_addr);
1495err_pci_iomap:
1496 spi_master_put(master);
1497
1498 return ret;
1499}
1500
1501static int __devexit pch_spi_pd_remove(struct platform_device *plat_dev)
1502{
1503 struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev);
1504 struct pch_spi_data *data = platform_get_drvdata(plat_dev);
1505 int count;
1506 unsigned long flags;
1507
1508 dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n",
1509 __func__, plat_dev->id, board_dat->pdev->irq);
1510
1511 if (use_dma)
1512 pch_free_dma_buf(board_dat, data);
1513
1514 /* check for any pending messages; no action is taken if the queue
1515 * is still full; but at least we tried. Unload anyway */
1516 count = 500;
1517 spin_lock_irqsave(&data->lock, flags);
1518 data->status = STATUS_EXITING;
1519 while ((list_empty(&data->queue) == 0) && --count) {
1520 dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n",
1521 __func__);
1522 spin_unlock_irqrestore(&data->lock, flags);
1523 msleep(PCH_SLEEP_TIME);
1524 spin_lock_irqsave(&data->lock, flags);
1525 }
1526 spin_unlock_irqrestore(&data->lock, flags);
1527
1528 pch_spi_free_resources(board_dat, data);
1529 /* disable interrupts & free IRQ */
1530 if (data->irq_reg_sts) {
1531 /* disable interrupts */
1532 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
1533 data->irq_reg_sts = false;
1534 free_irq(board_dat->pdev->irq, data);
1535 }
1536
1537 pci_iounmap(board_dat->pdev, data->io_remap_addr);
1538 spi_unregister_master(data->master);
1539 spi_master_put(data->master);
1540 platform_set_drvdata(plat_dev, NULL);
1541
1542 return 0;
1543}
1544#ifdef CONFIG_PM
1545static int pch_spi_pd_suspend(struct platform_device *pd_dev,
1546 pm_message_t state)
1547{
1548 u8 count;
1549 struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev);
1550 struct pch_spi_data *data = platform_get_drvdata(pd_dev);
1551
1552 dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__);
1553
1554 if (!board_dat) {
1555 dev_err(&pd_dev->dev,
1556 "%s pci_get_drvdata returned NULL\n", __func__);
1557 return -EFAULT;
1558 }
1559
1560 /* check if the current message is processed:
1561 Only after thats done the transfer will be suspended */
1562 count = 255;
1563 while ((--count) > 0) {
1564 if (!(data->bcurrent_msg_processing))
1565 break;
1566 msleep(PCH_SLEEP_TIME);
1567 }
1568
1569 /* Free IRQ */
1570 if (data->irq_reg_sts) {
1571 /* disable all interrupts */
1572 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
1573 pch_spi_reset(data->master);
1574 free_irq(board_dat->pdev->irq, data);
1575
1576 data->irq_reg_sts = false;
1577 dev_dbg(&pd_dev->dev,
1578 "%s free_irq invoked successfully.\n", __func__);
1579 }
1580
1581 return 0;
1582}
1583
1584static int pch_spi_pd_resume(struct platform_device *pd_dev)
1585{
1586 struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev);
1587 struct pch_spi_data *data = platform_get_drvdata(pd_dev);
1588 int retval;
1589
1590 if (!board_dat) {
1591 dev_err(&pd_dev->dev,
1592 "%s pci_get_drvdata returned NULL\n", __func__);
1593 return -EFAULT;
1594 }
1595
1596 if (!data->irq_reg_sts) {
1597 /* register IRQ */
1598 retval = request_irq(board_dat->pdev->irq, pch_spi_handler,
1599 IRQF_SHARED, KBUILD_MODNAME, data);
1600 if (retval < 0) {
1601 dev_err(&pd_dev->dev,
1602 "%s request_irq failed\n", __func__);
1603 return retval;
1604 }
1605
1606 /* reset PCH SPI h/w */
1607 pch_spi_reset(data->master);
1608 pch_spi_set_master_mode(data->master);
1609 data->irq_reg_sts = true;
1610 }
1611 return 0;
1612}
1613#else
1614#define pch_spi_pd_suspend NULL
1615#define pch_spi_pd_resume NULL
1616#endif
1617
1618static struct platform_driver pch_spi_pd_driver = {
1619 .driver = {
1620 .name = "pch-spi",
1621 .owner = THIS_MODULE,
1622 },
1623 .probe = pch_spi_pd_probe,
1624 .remove = __devexit_p(pch_spi_pd_remove),
1625 .suspend = pch_spi_pd_suspend,
1626 .resume = pch_spi_pd_resume
1627};
1628
1629static int __devinit pch_spi_probe(struct pci_dev *pdev,
1630 const struct pci_device_id *id)
1631{
1632 struct pch_spi_board_data *board_dat;
1633 struct platform_device *pd_dev = NULL;
1634 int retval;
1635 int i;
1636 struct pch_pd_dev_save *pd_dev_save;
1637
1638 pd_dev_save = kzalloc(sizeof(struct pch_pd_dev_save), GFP_KERNEL);
1639 if (!pd_dev_save) {
1640 dev_err(&pdev->dev, "%s Can't allocate pd_dev_sav\n", __func__);
1641 return -ENOMEM;
1642 }
1643
1644 board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL);
1645 if (!board_dat) {
1646 dev_err(&pdev->dev, "%s Can't allocate board_dat\n", __func__);
1647 retval = -ENOMEM;
1648 goto err_no_mem;
1649 }
1650
1651 retval = pci_request_regions(pdev, KBUILD_MODNAME);
1652 if (retval) {
1653 dev_err(&pdev->dev, "%s request_region failed\n", __func__);
1654 goto pci_request_regions;
1655 }
1656
1657 board_dat->pdev = pdev;
1658 board_dat->num = id->driver_data;
1659 pd_dev_save->num = id->driver_data;
1660 pd_dev_save->board_dat = board_dat;
1661
1662 retval = pci_enable_device(pdev);
1663 if (retval) {
1664 dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__);
1665 goto pci_enable_device;
1666 }
1667
1668 for (i = 0; i < board_dat->num; i++) {
1669 pd_dev = platform_device_alloc("pch-spi", i);
1670 if (!pd_dev) {
1671 dev_err(&pdev->dev, "platform_device_alloc failed\n");
1672 goto err_platform_device;
1673 }
1674 pd_dev_save->pd_save[i] = pd_dev;
1675 pd_dev->dev.parent = &pdev->dev;
1676
1677 retval = platform_device_add_data(pd_dev, board_dat,
1678 sizeof(*board_dat));
1679 if (retval) {
1680 dev_err(&pdev->dev,
1681 "platform_device_add_data failed\n");
1682 platform_device_put(pd_dev);
1683 goto err_platform_device;
1684 }
1685
1686 retval = platform_device_add(pd_dev);
1687 if (retval) {
1688 dev_err(&pdev->dev, "platform_device_add failed\n");
1689 platform_device_put(pd_dev);
1690 goto err_platform_device;
1691 }
1692 }
1693
1694 pci_set_drvdata(pdev, pd_dev_save);
1695
1696 return 0;
1697
1698err_platform_device:
1699 pci_disable_device(pdev);
1700pci_enable_device:
1701 pci_release_regions(pdev);
1702pci_request_regions:
1703 kfree(board_dat);
1704err_no_mem:
1705 kfree(pd_dev_save);
1706
1707 return retval;
1708}
1709
1710static void __devexit pch_spi_remove(struct pci_dev *pdev)
1711{
1712 int i;
1713 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1714
1715 dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev);
1716
1717 for (i = 0; i < pd_dev_save->num; i++)
1718 platform_device_unregister(pd_dev_save->pd_save[i]);
1719
1720 pci_disable_device(pdev);
1721 pci_release_regions(pdev);
1722 kfree(pd_dev_save->board_dat);
1723 kfree(pd_dev_save);
1724}
1725
1726#ifdef CONFIG_PM
1727static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
1728{
1729 int retval;
1730 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1731
1732 dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1733
1734 pd_dev_save->board_dat->suspend_sts = true;
1735
1736 /* save config space */
1737 retval = pci_save_state(pdev);
1738 if (retval == 0) {
1739 pci_enable_wake(pdev, PCI_D3hot, 0);
1740 pci_disable_device(pdev);
1741 pci_set_power_state(pdev, PCI_D3hot);
1742 } else {
1743 dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__);
1744 }
1745
1746 return retval;
1747}
1748
1749static int pch_spi_resume(struct pci_dev *pdev)
1750{
1751 int retval;
1752 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1753 dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1754
1755 pci_set_power_state(pdev, PCI_D0);
1756 pci_restore_state(pdev);
1757
1758 retval = pci_enable_device(pdev);
1759 if (retval < 0) {
1760 dev_err(&pdev->dev,
1761 "%s pci_enable_device failed\n", __func__);
1762 } else {
1763 pci_enable_wake(pdev, PCI_D3hot, 0);
1764
1765 /* set suspend status to false */
1766 pd_dev_save->board_dat->suspend_sts = false;
1767 }
1768
1769 return retval;
1770}
1771#else
1772#define pch_spi_suspend NULL
1773#define pch_spi_resume NULL
1774
1775#endif
1776
1777static struct pci_driver pch_spi_pcidev_driver = {
1778 .name = "pch_spi",
1779 .id_table = pch_spi_pcidev_id,
1780 .probe = pch_spi_probe,
1781 .remove = __devexit_p(pch_spi_remove),
1782 .suspend = pch_spi_suspend,
1783 .resume = pch_spi_resume,
1784};
1785
1786static int __init pch_spi_init(void)
1787{
1788 int ret;
1789 ret = platform_driver_register(&pch_spi_pd_driver);
1790 if (ret)
1791 return ret;
1792
1793 ret = pci_register_driver(&pch_spi_pcidev_driver);
1794 if (ret)
1795 return ret;
1796
1797 return 0;
1798}
1799module_init(pch_spi_init);
1800
1801static void __exit pch_spi_exit(void)
1802{
1803 pci_unregister_driver(&pch_spi_pcidev_driver);
1804 platform_driver_unregister(&pch_spi_pd_driver);
1805}
1806module_exit(pch_spi_exit);
1807
1808module_param(use_dma, int, 0644);
1809MODULE_PARM_DESC(use_dma,
1810 "to use DMA for data transfers pass 1 else 0; default 1");
1811
1812MODULE_LICENSE("GPL");
1813MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver");
1/*
2 * SPI bus driver for the Topcliff PCH used by Intel SoCs
3 *
4 * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/delay.h>
17#include <linux/pci.h>
18#include <linux/wait.h>
19#include <linux/spi/spi.h>
20#include <linux/interrupt.h>
21#include <linux/sched.h>
22#include <linux/spi/spidev.h>
23#include <linux/module.h>
24#include <linux/device.h>
25#include <linux/platform_device.h>
26
27#include <linux/dmaengine.h>
28#include <linux/pch_dma.h>
29
30/* Register offsets */
31#define PCH_SPCR 0x00 /* SPI control register */
32#define PCH_SPBRR 0x04 /* SPI baud rate register */
33#define PCH_SPSR 0x08 /* SPI status register */
34#define PCH_SPDWR 0x0C /* SPI write data register */
35#define PCH_SPDRR 0x10 /* SPI read data register */
36#define PCH_SSNXCR 0x18 /* SSN Expand Control Register */
37#define PCH_SRST 0x1C /* SPI reset register */
38#define PCH_ADDRESS_SIZE 0x20
39
40#define PCH_SPSR_TFD 0x000007C0
41#define PCH_SPSR_RFD 0x0000F800
42
43#define PCH_READABLE(x) (((x) & PCH_SPSR_RFD)>>11)
44#define PCH_WRITABLE(x) (((x) & PCH_SPSR_TFD)>>6)
45
46#define PCH_RX_THOLD 7
47#define PCH_RX_THOLD_MAX 15
48
49#define PCH_TX_THOLD 2
50
51#define PCH_MAX_BAUDRATE 5000000
52#define PCH_MAX_FIFO_DEPTH 16
53
54#define STATUS_RUNNING 1
55#define STATUS_EXITING 2
56#define PCH_SLEEP_TIME 10
57
58#define SSN_LOW 0x02U
59#define SSN_HIGH 0x03U
60#define SSN_NO_CONTROL 0x00U
61#define PCH_MAX_CS 0xFF
62#define PCI_DEVICE_ID_GE_SPI 0x8816
63
64#define SPCR_SPE_BIT (1 << 0)
65#define SPCR_MSTR_BIT (1 << 1)
66#define SPCR_LSBF_BIT (1 << 4)
67#define SPCR_CPHA_BIT (1 << 5)
68#define SPCR_CPOL_BIT (1 << 6)
69#define SPCR_TFIE_BIT (1 << 8)
70#define SPCR_RFIE_BIT (1 << 9)
71#define SPCR_FIE_BIT (1 << 10)
72#define SPCR_ORIE_BIT (1 << 11)
73#define SPCR_MDFIE_BIT (1 << 12)
74#define SPCR_FICLR_BIT (1 << 24)
75#define SPSR_TFI_BIT (1 << 0)
76#define SPSR_RFI_BIT (1 << 1)
77#define SPSR_FI_BIT (1 << 2)
78#define SPSR_ORF_BIT (1 << 3)
79#define SPBRR_SIZE_BIT (1 << 10)
80
81#define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|\
82 SPCR_ORIE_BIT|SPCR_MDFIE_BIT)
83
84#define SPCR_RFIC_FIELD 20
85#define SPCR_TFIC_FIELD 16
86
87#define MASK_SPBRR_SPBR_BITS ((1 << 10) - 1)
88#define MASK_RFIC_SPCR_BITS (0xf << SPCR_RFIC_FIELD)
89#define MASK_TFIC_SPCR_BITS (0xf << SPCR_TFIC_FIELD)
90
91#define PCH_CLOCK_HZ 50000000
92#define PCH_MAX_SPBR 1023
93
94/* Definition for ML7213/ML7223/ML7831 by LAPIS Semiconductor */
95#define PCI_VENDOR_ID_ROHM 0x10DB
96#define PCI_DEVICE_ID_ML7213_SPI 0x802c
97#define PCI_DEVICE_ID_ML7223_SPI 0x800F
98#define PCI_DEVICE_ID_ML7831_SPI 0x8816
99
100/*
101 * Set the number of SPI instance max
102 * Intel EG20T PCH : 1ch
103 * LAPIS Semiconductor ML7213 IOH : 2ch
104 * LAPIS Semiconductor ML7223 IOH : 1ch
105 * LAPIS Semiconductor ML7831 IOH : 1ch
106*/
107#define PCH_SPI_MAX_DEV 2
108
109#define PCH_BUF_SIZE 4096
110#define PCH_DMA_TRANS_SIZE 12
111
112static int use_dma = 1;
113
114struct pch_spi_dma_ctrl {
115 struct dma_async_tx_descriptor *desc_tx;
116 struct dma_async_tx_descriptor *desc_rx;
117 struct pch_dma_slave param_tx;
118 struct pch_dma_slave param_rx;
119 struct dma_chan *chan_tx;
120 struct dma_chan *chan_rx;
121 struct scatterlist *sg_tx_p;
122 struct scatterlist *sg_rx_p;
123 struct scatterlist sg_tx;
124 struct scatterlist sg_rx;
125 int nent;
126 void *tx_buf_virt;
127 void *rx_buf_virt;
128 dma_addr_t tx_buf_dma;
129 dma_addr_t rx_buf_dma;
130};
131/**
132 * struct pch_spi_data - Holds the SPI channel specific details
133 * @io_remap_addr: The remapped PCI base address
134 * @master: Pointer to the SPI master structure
135 * @work: Reference to work queue handler
136 * @wait: Wait queue for waking up upon receiving an
137 * interrupt.
138 * @transfer_complete: Status of SPI Transfer
139 * @bcurrent_msg_processing: Status flag for message processing
140 * @lock: Lock for protecting this structure
141 * @queue: SPI Message queue
142 * @status: Status of the SPI driver
143 * @bpw_len: Length of data to be transferred in bits per
144 * word
145 * @transfer_active: Flag showing active transfer
146 * @tx_index: Transmit data count; for bookkeeping during
147 * transfer
148 * @rx_index: Receive data count; for bookkeeping during
149 * transfer
150 * @tx_buff: Buffer for data to be transmitted
151 * @rx_index: Buffer for Received data
152 * @n_curnt_chip: The chip number that this SPI driver currently
153 * operates on
154 * @current_chip: Reference to the current chip that this SPI
155 * driver currently operates on
156 * @current_msg: The current message that this SPI driver is
157 * handling
158 * @cur_trans: The current transfer that this SPI driver is
159 * handling
160 * @board_dat: Reference to the SPI device data structure
161 * @plat_dev: platform_device structure
162 * @ch: SPI channel number
163 * @irq_reg_sts: Status of IRQ registration
164 */
165struct pch_spi_data {
166 void __iomem *io_remap_addr;
167 unsigned long io_base_addr;
168 struct spi_master *master;
169 struct work_struct work;
170 wait_queue_head_t wait;
171 u8 transfer_complete;
172 u8 bcurrent_msg_processing;
173 spinlock_t lock;
174 struct list_head queue;
175 u8 status;
176 u32 bpw_len;
177 u8 transfer_active;
178 u32 tx_index;
179 u32 rx_index;
180 u16 *pkt_tx_buff;
181 u16 *pkt_rx_buff;
182 u8 n_curnt_chip;
183 struct spi_device *current_chip;
184 struct spi_message *current_msg;
185 struct spi_transfer *cur_trans;
186 struct pch_spi_board_data *board_dat;
187 struct platform_device *plat_dev;
188 int ch;
189 struct pch_spi_dma_ctrl dma;
190 int use_dma;
191 u8 irq_reg_sts;
192 int save_total_len;
193};
194
195/**
196 * struct pch_spi_board_data - Holds the SPI device specific details
197 * @pdev: Pointer to the PCI device
198 * @suspend_sts: Status of suspend
199 * @num: The number of SPI device instance
200 */
201struct pch_spi_board_data {
202 struct pci_dev *pdev;
203 u8 suspend_sts;
204 int num;
205};
206
207struct pch_pd_dev_save {
208 int num;
209 struct platform_device *pd_save[PCH_SPI_MAX_DEV];
210 struct pch_spi_board_data *board_dat;
211};
212
213static const struct pci_device_id pch_spi_pcidev_id[] = {
214 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI), 1, },
215 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, },
216 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_SPI), 1, },
217 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_SPI), 1, },
218 { }
219};
220
221/**
222 * pch_spi_writereg() - Performs register writes
223 * @master: Pointer to struct spi_master.
224 * @idx: Register offset.
225 * @val: Value to be written to register.
226 */
227static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val)
228{
229 struct pch_spi_data *data = spi_master_get_devdata(master);
230 iowrite32(val, (data->io_remap_addr + idx));
231}
232
233/**
234 * pch_spi_readreg() - Performs register reads
235 * @master: Pointer to struct spi_master.
236 * @idx: Register offset.
237 */
238static inline u32 pch_spi_readreg(struct spi_master *master, int idx)
239{
240 struct pch_spi_data *data = spi_master_get_devdata(master);
241 return ioread32(data->io_remap_addr + idx);
242}
243
244static inline void pch_spi_setclr_reg(struct spi_master *master, int idx,
245 u32 set, u32 clr)
246{
247 u32 tmp = pch_spi_readreg(master, idx);
248 tmp = (tmp & ~clr) | set;
249 pch_spi_writereg(master, idx, tmp);
250}
251
252static void pch_spi_set_master_mode(struct spi_master *master)
253{
254 pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0);
255}
256
257/**
258 * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs
259 * @master: Pointer to struct spi_master.
260 */
261static void pch_spi_clear_fifo(struct spi_master *master)
262{
263 pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0);
264 pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT);
265}
266
267static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
268 void __iomem *io_remap_addr)
269{
270 u32 n_read, tx_index, rx_index, bpw_len;
271 u16 *pkt_rx_buffer, *pkt_tx_buff;
272 int read_cnt;
273 u32 reg_spcr_val;
274 void __iomem *spsr;
275 void __iomem *spdrr;
276 void __iomem *spdwr;
277
278 spsr = io_remap_addr + PCH_SPSR;
279 iowrite32(reg_spsr_val, spsr);
280
281 if (data->transfer_active) {
282 rx_index = data->rx_index;
283 tx_index = data->tx_index;
284 bpw_len = data->bpw_len;
285 pkt_rx_buffer = data->pkt_rx_buff;
286 pkt_tx_buff = data->pkt_tx_buff;
287
288 spdrr = io_remap_addr + PCH_SPDRR;
289 spdwr = io_remap_addr + PCH_SPDWR;
290
291 n_read = PCH_READABLE(reg_spsr_val);
292
293 for (read_cnt = 0; (read_cnt < n_read); read_cnt++) {
294 pkt_rx_buffer[rx_index++] = ioread32(spdrr);
295 if (tx_index < bpw_len)
296 iowrite32(pkt_tx_buff[tx_index++], spdwr);
297 }
298
299 /* disable RFI if not needed */
300 if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) {
301 reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR);
302 reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */
303
304 /* reset rx threshold */
305 reg_spcr_val &= ~MASK_RFIC_SPCR_BITS;
306 reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD);
307
308 iowrite32(reg_spcr_val, (io_remap_addr + PCH_SPCR));
309 }
310
311 /* update counts */
312 data->tx_index = tx_index;
313 data->rx_index = rx_index;
314
315 /* if transfer complete interrupt */
316 if (reg_spsr_val & SPSR_FI_BIT) {
317 if ((tx_index == bpw_len) && (rx_index == tx_index)) {
318 /* disable interrupts */
319 pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
320 PCH_ALL);
321
322 /* transfer is completed;
323 inform pch_spi_process_messages */
324 data->transfer_complete = true;
325 data->transfer_active = false;
326 wake_up(&data->wait);
327 } else {
328 dev_vdbg(&data->master->dev,
329 "%s : Transfer is not completed",
330 __func__);
331 }
332 }
333 }
334}
335
336/**
337 * pch_spi_handler() - Interrupt handler
338 * @irq: The interrupt number.
339 * @dev_id: Pointer to struct pch_spi_board_data.
340 */
341static irqreturn_t pch_spi_handler(int irq, void *dev_id)
342{
343 u32 reg_spsr_val;
344 void __iomem *spsr;
345 void __iomem *io_remap_addr;
346 irqreturn_t ret = IRQ_NONE;
347 struct pch_spi_data *data = dev_id;
348 struct pch_spi_board_data *board_dat = data->board_dat;
349
350 if (board_dat->suspend_sts) {
351 dev_dbg(&board_dat->pdev->dev,
352 "%s returning due to suspend\n", __func__);
353 return IRQ_NONE;
354 }
355
356 io_remap_addr = data->io_remap_addr;
357 spsr = io_remap_addr + PCH_SPSR;
358
359 reg_spsr_val = ioread32(spsr);
360
361 if (reg_spsr_val & SPSR_ORF_BIT) {
362 dev_err(&board_dat->pdev->dev, "%s Over run error\n", __func__);
363 if (data->current_msg->complete) {
364 data->transfer_complete = true;
365 data->current_msg->status = -EIO;
366 data->current_msg->complete(data->current_msg->context);
367 data->bcurrent_msg_processing = false;
368 data->current_msg = NULL;
369 data->cur_trans = NULL;
370 }
371 }
372
373 if (data->use_dma)
374 return IRQ_NONE;
375
376 /* Check if the interrupt is for SPI device */
377 if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) {
378 pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr);
379 ret = IRQ_HANDLED;
380 }
381
382 dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n",
383 __func__, ret);
384
385 return ret;
386}
387
388/**
389 * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR
390 * @master: Pointer to struct spi_master.
391 * @speed_hz: Baud rate.
392 */
393static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz)
394{
395 u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2);
396
397 /* if baud rate is less than we can support limit it */
398 if (n_spbr > PCH_MAX_SPBR)
399 n_spbr = PCH_MAX_SPBR;
400
401 pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, MASK_SPBRR_SPBR_BITS);
402}
403
404/**
405 * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR
406 * @master: Pointer to struct spi_master.
407 * @bits_per_word: Bits per word for SPI transfer.
408 */
409static void pch_spi_set_bits_per_word(struct spi_master *master,
410 u8 bits_per_word)
411{
412 if (bits_per_word == 8)
413 pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT);
414 else
415 pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0);
416}
417
418/**
419 * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer
420 * @spi: Pointer to struct spi_device.
421 */
422static void pch_spi_setup_transfer(struct spi_device *spi)
423{
424 u32 flags = 0;
425
426 dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n",
427 __func__, pch_spi_readreg(spi->master, PCH_SPBRR),
428 spi->max_speed_hz);
429 pch_spi_set_baud_rate(spi->master, spi->max_speed_hz);
430
431 /* set bits per word */
432 pch_spi_set_bits_per_word(spi->master, spi->bits_per_word);
433
434 if (!(spi->mode & SPI_LSB_FIRST))
435 flags |= SPCR_LSBF_BIT;
436 if (spi->mode & SPI_CPOL)
437 flags |= SPCR_CPOL_BIT;
438 if (spi->mode & SPI_CPHA)
439 flags |= SPCR_CPHA_BIT;
440 pch_spi_setclr_reg(spi->master, PCH_SPCR, flags,
441 (SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT));
442
443 /* Clear the FIFO by toggling FICLR to 1 and back to 0 */
444 pch_spi_clear_fifo(spi->master);
445}
446
447/**
448 * pch_spi_reset() - Clears SPI registers
449 * @master: Pointer to struct spi_master.
450 */
451static void pch_spi_reset(struct spi_master *master)
452{
453 /* write 1 to reset SPI */
454 pch_spi_writereg(master, PCH_SRST, 0x1);
455
456 /* clear reset */
457 pch_spi_writereg(master, PCH_SRST, 0x0);
458}
459
460static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
461{
462
463 struct spi_transfer *transfer;
464 struct pch_spi_data *data = spi_master_get_devdata(pspi->master);
465 int retval;
466 unsigned long flags;
467
468 spin_lock_irqsave(&data->lock, flags);
469 /* validate Tx/Rx buffers and Transfer length */
470 list_for_each_entry(transfer, &pmsg->transfers, transfer_list) {
471 if (!transfer->tx_buf && !transfer->rx_buf) {
472 dev_err(&pspi->dev,
473 "%s Tx and Rx buffer NULL\n", __func__);
474 retval = -EINVAL;
475 goto err_return_spinlock;
476 }
477
478 if (!transfer->len) {
479 dev_err(&pspi->dev, "%s Transfer length invalid\n",
480 __func__);
481 retval = -EINVAL;
482 goto err_return_spinlock;
483 }
484
485 dev_dbg(&pspi->dev,
486 "%s Tx/Rx buffer valid. Transfer length valid\n",
487 __func__);
488 }
489 spin_unlock_irqrestore(&data->lock, flags);
490
491 /* We won't process any messages if we have been asked to terminate */
492 if (data->status == STATUS_EXITING) {
493 dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__);
494 retval = -ESHUTDOWN;
495 goto err_out;
496 }
497
498 /* If suspended ,return -EINVAL */
499 if (data->board_dat->suspend_sts) {
500 dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__);
501 retval = -EINVAL;
502 goto err_out;
503 }
504
505 /* set status of message */
506 pmsg->actual_length = 0;
507 dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status);
508
509 pmsg->status = -EINPROGRESS;
510 spin_lock_irqsave(&data->lock, flags);
511 /* add message to queue */
512 list_add_tail(&pmsg->queue, &data->queue);
513 spin_unlock_irqrestore(&data->lock, flags);
514
515 dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
516
517 schedule_work(&data->work);
518 dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
519
520 retval = 0;
521
522err_out:
523 dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
524 return retval;
525err_return_spinlock:
526 dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
527 spin_unlock_irqrestore(&data->lock, flags);
528 return retval;
529}
530
531static inline void pch_spi_select_chip(struct pch_spi_data *data,
532 struct spi_device *pspi)
533{
534 if (data->current_chip != NULL) {
535 if (pspi->chip_select != data->n_curnt_chip) {
536 dev_dbg(&pspi->dev, "%s : different slave\n", __func__);
537 data->current_chip = NULL;
538 }
539 }
540
541 data->current_chip = pspi;
542
543 data->n_curnt_chip = data->current_chip->chip_select;
544
545 dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__);
546 pch_spi_setup_transfer(pspi);
547}
548
549static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw)
550{
551 int size;
552 u32 n_writes;
553 int j;
554 struct spi_message *pmsg, *tmp;
555 const u8 *tx_buf;
556 const u16 *tx_sbuf;
557
558 /* set baud rate if needed */
559 if (data->cur_trans->speed_hz) {
560 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
561 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
562 }
563
564 /* set bits per word if needed */
565 if (data->cur_trans->bits_per_word &&
566 (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) {
567 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
568 pch_spi_set_bits_per_word(data->master,
569 data->cur_trans->bits_per_word);
570 *bpw = data->cur_trans->bits_per_word;
571 } else {
572 *bpw = data->current_msg->spi->bits_per_word;
573 }
574
575 /* reset Tx/Rx index */
576 data->tx_index = 0;
577 data->rx_index = 0;
578
579 data->bpw_len = data->cur_trans->len / (*bpw / 8);
580
581 /* find alloc size */
582 size = data->cur_trans->len * sizeof(*data->pkt_tx_buff);
583
584 /* allocate memory for pkt_tx_buff & pkt_rx_buffer */
585 data->pkt_tx_buff = kzalloc(size, GFP_KERNEL);
586 if (data->pkt_tx_buff != NULL) {
587 data->pkt_rx_buff = kzalloc(size, GFP_KERNEL);
588 if (!data->pkt_rx_buff)
589 kfree(data->pkt_tx_buff);
590 }
591
592 if (!data->pkt_rx_buff) {
593 /* flush queue and set status of all transfers to -ENOMEM */
594 dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__);
595 list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
596 pmsg->status = -ENOMEM;
597
598 if (pmsg->complete)
599 pmsg->complete(pmsg->context);
600
601 /* delete from queue */
602 list_del_init(&pmsg->queue);
603 }
604 return;
605 }
606
607 /* copy Tx Data */
608 if (data->cur_trans->tx_buf != NULL) {
609 if (*bpw == 8) {
610 tx_buf = data->cur_trans->tx_buf;
611 for (j = 0; j < data->bpw_len; j++)
612 data->pkt_tx_buff[j] = *tx_buf++;
613 } else {
614 tx_sbuf = data->cur_trans->tx_buf;
615 for (j = 0; j < data->bpw_len; j++)
616 data->pkt_tx_buff[j] = *tx_sbuf++;
617 }
618 }
619
620 /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */
621 n_writes = data->bpw_len;
622 if (n_writes > PCH_MAX_FIFO_DEPTH)
623 n_writes = PCH_MAX_FIFO_DEPTH;
624
625 dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
626 "0x2 to SSNXCR\n", __func__);
627 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
628
629 for (j = 0; j < n_writes; j++)
630 pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]);
631
632 /* update tx_index */
633 data->tx_index = j;
634
635 /* reset transfer complete flag */
636 data->transfer_complete = false;
637 data->transfer_active = true;
638}
639
640static void pch_spi_nomore_transfer(struct pch_spi_data *data)
641{
642 struct spi_message *pmsg, *tmp;
643 dev_dbg(&data->master->dev, "%s called\n", __func__);
644 /* Invoke complete callback
645 * [To the spi core..indicating end of transfer] */
646 data->current_msg->status = 0;
647
648 if (data->current_msg->complete) {
649 dev_dbg(&data->master->dev,
650 "%s:Invoking callback of SPI core\n", __func__);
651 data->current_msg->complete(data->current_msg->context);
652 }
653
654 /* update status in global variable */
655 data->bcurrent_msg_processing = false;
656
657 dev_dbg(&data->master->dev,
658 "%s:data->bcurrent_msg_processing = false\n", __func__);
659
660 data->current_msg = NULL;
661 data->cur_trans = NULL;
662
663 /* check if we have items in list and not suspending
664 * return 1 if list empty */
665 if ((list_empty(&data->queue) == 0) &&
666 (!data->board_dat->suspend_sts) &&
667 (data->status != STATUS_EXITING)) {
668 /* We have some more work to do (either there is more tranint
669 * bpw;sfer requests in the current message or there are
670 *more messages)
671 */
672 dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__);
673 schedule_work(&data->work);
674 } else if (data->board_dat->suspend_sts ||
675 data->status == STATUS_EXITING) {
676 dev_dbg(&data->master->dev,
677 "%s suspend/remove initiated, flushing queue\n",
678 __func__);
679 list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
680 pmsg->status = -EIO;
681
682 if (pmsg->complete)
683 pmsg->complete(pmsg->context);
684
685 /* delete from queue */
686 list_del_init(&pmsg->queue);
687 }
688 }
689}
690
691static void pch_spi_set_ir(struct pch_spi_data *data)
692{
693 /* enable interrupts, set threshold, enable SPI */
694 if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH)
695 /* set receive threshold to PCH_RX_THOLD */
696 pch_spi_setclr_reg(data->master, PCH_SPCR,
697 PCH_RX_THOLD << SPCR_RFIC_FIELD |
698 SPCR_FIE_BIT | SPCR_RFIE_BIT |
699 SPCR_ORIE_BIT | SPCR_SPE_BIT,
700 MASK_RFIC_SPCR_BITS | PCH_ALL);
701 else
702 /* set receive threshold to maximum */
703 pch_spi_setclr_reg(data->master, PCH_SPCR,
704 PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD |
705 SPCR_FIE_BIT | SPCR_ORIE_BIT |
706 SPCR_SPE_BIT,
707 MASK_RFIC_SPCR_BITS | PCH_ALL);
708
709 /* Wait until the transfer completes; go to sleep after
710 initiating the transfer. */
711 dev_dbg(&data->master->dev,
712 "%s:waiting for transfer to get over\n", __func__);
713
714 wait_event_interruptible(data->wait, data->transfer_complete);
715
716 /* clear all interrupts */
717 pch_spi_writereg(data->master, PCH_SPSR,
718 pch_spi_readreg(data->master, PCH_SPSR));
719 /* Disable interrupts and SPI transfer */
720 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT);
721 /* clear FIFO */
722 pch_spi_clear_fifo(data->master);
723}
724
725static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
726{
727 int j;
728 u8 *rx_buf;
729 u16 *rx_sbuf;
730
731 /* copy Rx Data */
732 if (!data->cur_trans->rx_buf)
733 return;
734
735 if (bpw == 8) {
736 rx_buf = data->cur_trans->rx_buf;
737 for (j = 0; j < data->bpw_len; j++)
738 *rx_buf++ = data->pkt_rx_buff[j] & 0xFF;
739 } else {
740 rx_sbuf = data->cur_trans->rx_buf;
741 for (j = 0; j < data->bpw_len; j++)
742 *rx_sbuf++ = data->pkt_rx_buff[j];
743 }
744}
745
746static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw)
747{
748 int j;
749 u8 *rx_buf;
750 u16 *rx_sbuf;
751 const u8 *rx_dma_buf;
752 const u16 *rx_dma_sbuf;
753
754 /* copy Rx Data */
755 if (!data->cur_trans->rx_buf)
756 return;
757
758 if (bpw == 8) {
759 rx_buf = data->cur_trans->rx_buf;
760 rx_dma_buf = data->dma.rx_buf_virt;
761 for (j = 0; j < data->bpw_len; j++)
762 *rx_buf++ = *rx_dma_buf++ & 0xFF;
763 data->cur_trans->rx_buf = rx_buf;
764 } else {
765 rx_sbuf = data->cur_trans->rx_buf;
766 rx_dma_sbuf = data->dma.rx_buf_virt;
767 for (j = 0; j < data->bpw_len; j++)
768 *rx_sbuf++ = *rx_dma_sbuf++;
769 data->cur_trans->rx_buf = rx_sbuf;
770 }
771}
772
773static int pch_spi_start_transfer(struct pch_spi_data *data)
774{
775 struct pch_spi_dma_ctrl *dma;
776 unsigned long flags;
777 int rtn;
778
779 dma = &data->dma;
780
781 spin_lock_irqsave(&data->lock, flags);
782
783 /* disable interrupts, SPI set enable */
784 pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL);
785
786 spin_unlock_irqrestore(&data->lock, flags);
787
788 /* Wait until the transfer completes; go to sleep after
789 initiating the transfer. */
790 dev_dbg(&data->master->dev,
791 "%s:waiting for transfer to get over\n", __func__);
792 rtn = wait_event_interruptible_timeout(data->wait,
793 data->transfer_complete,
794 msecs_to_jiffies(2 * HZ));
795 if (!rtn)
796 dev_err(&data->master->dev,
797 "%s wait-event timeout\n", __func__);
798
799 dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent,
800 DMA_FROM_DEVICE);
801
802 dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent,
803 DMA_FROM_DEVICE);
804 memset(data->dma.tx_buf_virt, 0, PAGE_SIZE);
805
806 async_tx_ack(dma->desc_rx);
807 async_tx_ack(dma->desc_tx);
808 kfree(dma->sg_tx_p);
809 kfree(dma->sg_rx_p);
810
811 spin_lock_irqsave(&data->lock, flags);
812
813 /* clear fifo threshold, disable interrupts, disable SPI transfer */
814 pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
815 MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS | PCH_ALL |
816 SPCR_SPE_BIT);
817 /* clear all interrupts */
818 pch_spi_writereg(data->master, PCH_SPSR,
819 pch_spi_readreg(data->master, PCH_SPSR));
820 /* clear FIFO */
821 pch_spi_clear_fifo(data->master);
822
823 spin_unlock_irqrestore(&data->lock, flags);
824
825 return rtn;
826}
827
828static void pch_dma_rx_complete(void *arg)
829{
830 struct pch_spi_data *data = arg;
831
832 /* transfer is completed;inform pch_spi_process_messages_dma */
833 data->transfer_complete = true;
834 wake_up_interruptible(&data->wait);
835}
836
837static bool pch_spi_filter(struct dma_chan *chan, void *slave)
838{
839 struct pch_dma_slave *param = slave;
840
841 if ((chan->chan_id == param->chan_id) &&
842 (param->dma_dev == chan->device->dev)) {
843 chan->private = param;
844 return true;
845 } else {
846 return false;
847 }
848}
849
850static void pch_spi_request_dma(struct pch_spi_data *data, int bpw)
851{
852 dma_cap_mask_t mask;
853 struct dma_chan *chan;
854 struct pci_dev *dma_dev;
855 struct pch_dma_slave *param;
856 struct pch_spi_dma_ctrl *dma;
857 unsigned int width;
858
859 if (bpw == 8)
860 width = PCH_DMA_WIDTH_1_BYTE;
861 else
862 width = PCH_DMA_WIDTH_2_BYTES;
863
864 dma = &data->dma;
865 dma_cap_zero(mask);
866 dma_cap_set(DMA_SLAVE, mask);
867
868 /* Get DMA's dev information */
869 dma_dev = pci_get_slot(data->board_dat->pdev->bus,
870 PCI_DEVFN(PCI_SLOT(data->board_dat->pdev->devfn), 0));
871
872 /* Set Tx DMA */
873 param = &dma->param_tx;
874 param->dma_dev = &dma_dev->dev;
875 param->chan_id = data->ch * 2; /* Tx = 0, 2 */;
876 param->tx_reg = data->io_base_addr + PCH_SPDWR;
877 param->width = width;
878 chan = dma_request_channel(mask, pch_spi_filter, param);
879 if (!chan) {
880 dev_err(&data->master->dev,
881 "ERROR: dma_request_channel FAILS(Tx)\n");
882 data->use_dma = 0;
883 return;
884 }
885 dma->chan_tx = chan;
886
887 /* Set Rx DMA */
888 param = &dma->param_rx;
889 param->dma_dev = &dma_dev->dev;
890 param->chan_id = data->ch * 2 + 1; /* Rx = Tx + 1 */;
891 param->rx_reg = data->io_base_addr + PCH_SPDRR;
892 param->width = width;
893 chan = dma_request_channel(mask, pch_spi_filter, param);
894 if (!chan) {
895 dev_err(&data->master->dev,
896 "ERROR: dma_request_channel FAILS(Rx)\n");
897 dma_release_channel(dma->chan_tx);
898 dma->chan_tx = NULL;
899 data->use_dma = 0;
900 return;
901 }
902 dma->chan_rx = chan;
903}
904
905static void pch_spi_release_dma(struct pch_spi_data *data)
906{
907 struct pch_spi_dma_ctrl *dma;
908
909 dma = &data->dma;
910 if (dma->chan_tx) {
911 dma_release_channel(dma->chan_tx);
912 dma->chan_tx = NULL;
913 }
914 if (dma->chan_rx) {
915 dma_release_channel(dma->chan_rx);
916 dma->chan_rx = NULL;
917 }
918 return;
919}
920
921static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
922{
923 const u8 *tx_buf;
924 const u16 *tx_sbuf;
925 u8 *tx_dma_buf;
926 u16 *tx_dma_sbuf;
927 struct scatterlist *sg;
928 struct dma_async_tx_descriptor *desc_tx;
929 struct dma_async_tx_descriptor *desc_rx;
930 int num;
931 int i;
932 int size;
933 int rem;
934 int head;
935 unsigned long flags;
936 struct pch_spi_dma_ctrl *dma;
937
938 dma = &data->dma;
939
940 /* set baud rate if needed */
941 if (data->cur_trans->speed_hz) {
942 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
943 spin_lock_irqsave(&data->lock, flags);
944 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
945 spin_unlock_irqrestore(&data->lock, flags);
946 }
947
948 /* set bits per word if needed */
949 if (data->cur_trans->bits_per_word &&
950 (data->current_msg->spi->bits_per_word !=
951 data->cur_trans->bits_per_word)) {
952 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
953 spin_lock_irqsave(&data->lock, flags);
954 pch_spi_set_bits_per_word(data->master,
955 data->cur_trans->bits_per_word);
956 spin_unlock_irqrestore(&data->lock, flags);
957 *bpw = data->cur_trans->bits_per_word;
958 } else {
959 *bpw = data->current_msg->spi->bits_per_word;
960 }
961 data->bpw_len = data->cur_trans->len / (*bpw / 8);
962
963 if (data->bpw_len > PCH_BUF_SIZE) {
964 data->bpw_len = PCH_BUF_SIZE;
965 data->cur_trans->len -= PCH_BUF_SIZE;
966 }
967
968 /* copy Tx Data */
969 if (data->cur_trans->tx_buf != NULL) {
970 if (*bpw == 8) {
971 tx_buf = data->cur_trans->tx_buf;
972 tx_dma_buf = dma->tx_buf_virt;
973 for (i = 0; i < data->bpw_len; i++)
974 *tx_dma_buf++ = *tx_buf++;
975 } else {
976 tx_sbuf = data->cur_trans->tx_buf;
977 tx_dma_sbuf = dma->tx_buf_virt;
978 for (i = 0; i < data->bpw_len; i++)
979 *tx_dma_sbuf++ = *tx_sbuf++;
980 }
981 }
982
983 /* Calculate Rx parameter for DMA transmitting */
984 if (data->bpw_len > PCH_DMA_TRANS_SIZE) {
985 if (data->bpw_len % PCH_DMA_TRANS_SIZE) {
986 num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
987 rem = data->bpw_len % PCH_DMA_TRANS_SIZE;
988 } else {
989 num = data->bpw_len / PCH_DMA_TRANS_SIZE;
990 rem = PCH_DMA_TRANS_SIZE;
991 }
992 size = PCH_DMA_TRANS_SIZE;
993 } else {
994 num = 1;
995 size = data->bpw_len;
996 rem = data->bpw_len;
997 }
998 dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n",
999 __func__, num, size, rem);
1000 spin_lock_irqsave(&data->lock, flags);
1001
1002 /* set receive fifo threshold and transmit fifo threshold */
1003 pch_spi_setclr_reg(data->master, PCH_SPCR,
1004 ((size - 1) << SPCR_RFIC_FIELD) |
1005 (PCH_TX_THOLD << SPCR_TFIC_FIELD),
1006 MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS);
1007
1008 spin_unlock_irqrestore(&data->lock, flags);
1009
1010 /* RX */
1011 dma->sg_rx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1012 sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */
1013 /* offset, length setting */
1014 sg = dma->sg_rx_p;
1015 for (i = 0; i < num; i++, sg++) {
1016 if (i == (num - 2)) {
1017 sg->offset = size * i;
1018 sg->offset = sg->offset * (*bpw / 8);
1019 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem,
1020 sg->offset);
1021 sg_dma_len(sg) = rem;
1022 } else if (i == (num - 1)) {
1023 sg->offset = size * (i - 1) + rem;
1024 sg->offset = sg->offset * (*bpw / 8);
1025 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size,
1026 sg->offset);
1027 sg_dma_len(sg) = size;
1028 } else {
1029 sg->offset = size * i;
1030 sg->offset = sg->offset * (*bpw / 8);
1031 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size,
1032 sg->offset);
1033 sg_dma_len(sg) = size;
1034 }
1035 sg_dma_address(sg) = dma->rx_buf_dma + sg->offset;
1036 }
1037 sg = dma->sg_rx_p;
1038 desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg,
1039 num, DMA_DEV_TO_MEM,
1040 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1041 if (!desc_rx) {
1042 dev_err(&data->master->dev,
1043 "%s:dmaengine_prep_slave_sg Failed\n", __func__);
1044 return;
1045 }
1046 dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE);
1047 desc_rx->callback = pch_dma_rx_complete;
1048 desc_rx->callback_param = data;
1049 dma->nent = num;
1050 dma->desc_rx = desc_rx;
1051
1052 /* Calculate Tx parameter for DMA transmitting */
1053 if (data->bpw_len > PCH_MAX_FIFO_DEPTH) {
1054 head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE;
1055 if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) {
1056 num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
1057 rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head;
1058 } else {
1059 num = data->bpw_len / PCH_DMA_TRANS_SIZE;
1060 rem = data->bpw_len % PCH_DMA_TRANS_SIZE +
1061 PCH_DMA_TRANS_SIZE - head;
1062 }
1063 size = PCH_DMA_TRANS_SIZE;
1064 } else {
1065 num = 1;
1066 size = data->bpw_len;
1067 rem = data->bpw_len;
1068 head = 0;
1069 }
1070
1071 dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1072 sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */
1073 /* offset, length setting */
1074 sg = dma->sg_tx_p;
1075 for (i = 0; i < num; i++, sg++) {
1076 if (i == 0) {
1077 sg->offset = 0;
1078 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head,
1079 sg->offset);
1080 sg_dma_len(sg) = size + head;
1081 } else if (i == (num - 1)) {
1082 sg->offset = head + size * i;
1083 sg->offset = sg->offset * (*bpw / 8);
1084 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem,
1085 sg->offset);
1086 sg_dma_len(sg) = rem;
1087 } else {
1088 sg->offset = head + size * i;
1089 sg->offset = sg->offset * (*bpw / 8);
1090 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size,
1091 sg->offset);
1092 sg_dma_len(sg) = size;
1093 }
1094 sg_dma_address(sg) = dma->tx_buf_dma + sg->offset;
1095 }
1096 sg = dma->sg_tx_p;
1097 desc_tx = dmaengine_prep_slave_sg(dma->chan_tx,
1098 sg, num, DMA_MEM_TO_DEV,
1099 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1100 if (!desc_tx) {
1101 dev_err(&data->master->dev,
1102 "%s:dmaengine_prep_slave_sg Failed\n", __func__);
1103 return;
1104 }
1105 dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE);
1106 desc_tx->callback = NULL;
1107 desc_tx->callback_param = data;
1108 dma->nent = num;
1109 dma->desc_tx = desc_tx;
1110
1111 dev_dbg(&data->master->dev, "%s:Pulling down SSN low - writing 0x2 to SSNXCR\n", __func__);
1112
1113 spin_lock_irqsave(&data->lock, flags);
1114 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
1115 desc_rx->tx_submit(desc_rx);
1116 desc_tx->tx_submit(desc_tx);
1117 spin_unlock_irqrestore(&data->lock, flags);
1118
1119 /* reset transfer complete flag */
1120 data->transfer_complete = false;
1121}
1122
1123static void pch_spi_process_messages(struct work_struct *pwork)
1124{
1125 struct spi_message *pmsg, *tmp;
1126 struct pch_spi_data *data;
1127 int bpw;
1128
1129 data = container_of(pwork, struct pch_spi_data, work);
1130 dev_dbg(&data->master->dev, "%s data initialized\n", __func__);
1131
1132 spin_lock(&data->lock);
1133 /* check if suspend has been initiated;if yes flush queue */
1134 if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) {
1135 dev_dbg(&data->master->dev,
1136 "%s suspend/remove initiated, flushing queue\n", __func__);
1137 list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
1138 pmsg->status = -EIO;
1139
1140 if (pmsg->complete) {
1141 spin_unlock(&data->lock);
1142 pmsg->complete(pmsg->context);
1143 spin_lock(&data->lock);
1144 }
1145
1146 /* delete from queue */
1147 list_del_init(&pmsg->queue);
1148 }
1149
1150 spin_unlock(&data->lock);
1151 return;
1152 }
1153
1154 data->bcurrent_msg_processing = true;
1155 dev_dbg(&data->master->dev,
1156 "%s Set data->bcurrent_msg_processing= true\n", __func__);
1157
1158 /* Get the message from the queue and delete it from there. */
1159 data->current_msg = list_entry(data->queue.next, struct spi_message,
1160 queue);
1161
1162 list_del_init(&data->current_msg->queue);
1163
1164 data->current_msg->status = 0;
1165
1166 pch_spi_select_chip(data, data->current_msg->spi);
1167
1168 spin_unlock(&data->lock);
1169
1170 if (data->use_dma)
1171 pch_spi_request_dma(data,
1172 data->current_msg->spi->bits_per_word);
1173 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
1174 do {
1175 int cnt;
1176 /* If we are already processing a message get the next
1177 transfer structure from the message otherwise retrieve
1178 the 1st transfer request from the message. */
1179 spin_lock(&data->lock);
1180 if (data->cur_trans == NULL) {
1181 data->cur_trans =
1182 list_entry(data->current_msg->transfers.next,
1183 struct spi_transfer, transfer_list);
1184 dev_dbg(&data->master->dev, "%s "
1185 ":Getting 1st transfer message\n", __func__);
1186 } else {
1187 data->cur_trans =
1188 list_entry(data->cur_trans->transfer_list.next,
1189 struct spi_transfer, transfer_list);
1190 dev_dbg(&data->master->dev, "%s "
1191 ":Getting next transfer message\n", __func__);
1192 }
1193 spin_unlock(&data->lock);
1194
1195 if (!data->cur_trans->len)
1196 goto out;
1197 cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1;
1198 data->save_total_len = data->cur_trans->len;
1199 if (data->use_dma) {
1200 int i;
1201 char *save_rx_buf = data->cur_trans->rx_buf;
1202 for (i = 0; i < cnt; i ++) {
1203 pch_spi_handle_dma(data, &bpw);
1204 if (!pch_spi_start_transfer(data)) {
1205 data->transfer_complete = true;
1206 data->current_msg->status = -EIO;
1207 data->current_msg->complete
1208 (data->current_msg->context);
1209 data->bcurrent_msg_processing = false;
1210 data->current_msg = NULL;
1211 data->cur_trans = NULL;
1212 goto out;
1213 }
1214 pch_spi_copy_rx_data_for_dma(data, bpw);
1215 }
1216 data->cur_trans->rx_buf = save_rx_buf;
1217 } else {
1218 pch_spi_set_tx(data, &bpw);
1219 pch_spi_set_ir(data);
1220 pch_spi_copy_rx_data(data, bpw);
1221 kfree(data->pkt_rx_buff);
1222 data->pkt_rx_buff = NULL;
1223 kfree(data->pkt_tx_buff);
1224 data->pkt_tx_buff = NULL;
1225 }
1226 /* increment message count */
1227 data->cur_trans->len = data->save_total_len;
1228 data->current_msg->actual_length += data->cur_trans->len;
1229
1230 dev_dbg(&data->master->dev,
1231 "%s:data->current_msg->actual_length=%d\n",
1232 __func__, data->current_msg->actual_length);
1233
1234 /* check for delay */
1235 if (data->cur_trans->delay_usecs) {
1236 dev_dbg(&data->master->dev, "%s:"
1237 "delay in usec=%d\n", __func__,
1238 data->cur_trans->delay_usecs);
1239 udelay(data->cur_trans->delay_usecs);
1240 }
1241
1242 spin_lock(&data->lock);
1243
1244 /* No more transfer in this message. */
1245 if ((data->cur_trans->transfer_list.next) ==
1246 &(data->current_msg->transfers)) {
1247 pch_spi_nomore_transfer(data);
1248 }
1249
1250 spin_unlock(&data->lock);
1251
1252 } while (data->cur_trans != NULL);
1253
1254out:
1255 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH);
1256 if (data->use_dma)
1257 pch_spi_release_dma(data);
1258}
1259
1260static void pch_spi_free_resources(struct pch_spi_board_data *board_dat,
1261 struct pch_spi_data *data)
1262{
1263 dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1264
1265 flush_work(&data->work);
1266}
1267
1268static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
1269 struct pch_spi_data *data)
1270{
1271 dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1272
1273 /* reset PCH SPI h/w */
1274 pch_spi_reset(data->master);
1275 dev_dbg(&board_dat->pdev->dev,
1276 "%s pch_spi_reset invoked successfully\n", __func__);
1277
1278 dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__);
1279
1280 return 0;
1281}
1282
1283static void pch_free_dma_buf(struct pch_spi_board_data *board_dat,
1284 struct pch_spi_data *data)
1285{
1286 struct pch_spi_dma_ctrl *dma;
1287
1288 dma = &data->dma;
1289 if (dma->tx_buf_dma)
1290 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
1291 dma->tx_buf_virt, dma->tx_buf_dma);
1292 if (dma->rx_buf_dma)
1293 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
1294 dma->rx_buf_virt, dma->rx_buf_dma);
1295 return;
1296}
1297
1298static void pch_alloc_dma_buf(struct pch_spi_board_data *board_dat,
1299 struct pch_spi_data *data)
1300{
1301 struct pch_spi_dma_ctrl *dma;
1302
1303 dma = &data->dma;
1304 /* Get Consistent memory for Tx DMA */
1305 dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev,
1306 PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL);
1307 /* Get Consistent memory for Rx DMA */
1308 dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev,
1309 PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL);
1310}
1311
1312static int pch_spi_pd_probe(struct platform_device *plat_dev)
1313{
1314 int ret;
1315 struct spi_master *master;
1316 struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev);
1317 struct pch_spi_data *data;
1318
1319 dev_dbg(&plat_dev->dev, "%s:debug\n", __func__);
1320
1321 master = spi_alloc_master(&board_dat->pdev->dev,
1322 sizeof(struct pch_spi_data));
1323 if (!master) {
1324 dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n",
1325 plat_dev->id);
1326 return -ENOMEM;
1327 }
1328
1329 data = spi_master_get_devdata(master);
1330 data->master = master;
1331
1332 platform_set_drvdata(plat_dev, data);
1333
1334 /* baseaddress + address offset) */
1335 data->io_base_addr = pci_resource_start(board_dat->pdev, 1) +
1336 PCH_ADDRESS_SIZE * plat_dev->id;
1337 data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0);
1338 if (!data->io_remap_addr) {
1339 dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__);
1340 ret = -ENOMEM;
1341 goto err_pci_iomap;
1342 }
1343 data->io_remap_addr += PCH_ADDRESS_SIZE * plat_dev->id;
1344
1345 dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n",
1346 plat_dev->id, data->io_remap_addr);
1347
1348 /* initialize members of SPI master */
1349 master->num_chipselect = PCH_MAX_CS;
1350 master->transfer = pch_spi_transfer;
1351 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
1352 master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
1353 master->max_speed_hz = PCH_MAX_BAUDRATE;
1354
1355 data->board_dat = board_dat;
1356 data->plat_dev = plat_dev;
1357 data->n_curnt_chip = 255;
1358 data->status = STATUS_RUNNING;
1359 data->ch = plat_dev->id;
1360 data->use_dma = use_dma;
1361
1362 INIT_LIST_HEAD(&data->queue);
1363 spin_lock_init(&data->lock);
1364 INIT_WORK(&data->work, pch_spi_process_messages);
1365 init_waitqueue_head(&data->wait);
1366
1367 ret = pch_spi_get_resources(board_dat, data);
1368 if (ret) {
1369 dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret);
1370 goto err_spi_get_resources;
1371 }
1372
1373 ret = request_irq(board_dat->pdev->irq, pch_spi_handler,
1374 IRQF_SHARED, KBUILD_MODNAME, data);
1375 if (ret) {
1376 dev_err(&plat_dev->dev,
1377 "%s request_irq failed\n", __func__);
1378 goto err_request_irq;
1379 }
1380 data->irq_reg_sts = true;
1381
1382 pch_spi_set_master_mode(master);
1383
1384 if (use_dma) {
1385 dev_info(&plat_dev->dev, "Use DMA for data transfers\n");
1386 pch_alloc_dma_buf(board_dat, data);
1387 }
1388
1389 ret = spi_register_master(master);
1390 if (ret != 0) {
1391 dev_err(&plat_dev->dev,
1392 "%s spi_register_master FAILED\n", __func__);
1393 goto err_spi_register_master;
1394 }
1395
1396 return 0;
1397
1398err_spi_register_master:
1399 pch_free_dma_buf(board_dat, data);
1400 free_irq(board_dat->pdev->irq, data);
1401err_request_irq:
1402 pch_spi_free_resources(board_dat, data);
1403err_spi_get_resources:
1404 pci_iounmap(board_dat->pdev, data->io_remap_addr);
1405err_pci_iomap:
1406 spi_master_put(master);
1407
1408 return ret;
1409}
1410
1411static int pch_spi_pd_remove(struct platform_device *plat_dev)
1412{
1413 struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev);
1414 struct pch_spi_data *data = platform_get_drvdata(plat_dev);
1415 int count;
1416 unsigned long flags;
1417
1418 dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n",
1419 __func__, plat_dev->id, board_dat->pdev->irq);
1420
1421 if (use_dma)
1422 pch_free_dma_buf(board_dat, data);
1423
1424 /* check for any pending messages; no action is taken if the queue
1425 * is still full; but at least we tried. Unload anyway */
1426 count = 500;
1427 spin_lock_irqsave(&data->lock, flags);
1428 data->status = STATUS_EXITING;
1429 while ((list_empty(&data->queue) == 0) && --count) {
1430 dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n",
1431 __func__);
1432 spin_unlock_irqrestore(&data->lock, flags);
1433 msleep(PCH_SLEEP_TIME);
1434 spin_lock_irqsave(&data->lock, flags);
1435 }
1436 spin_unlock_irqrestore(&data->lock, flags);
1437
1438 pch_spi_free_resources(board_dat, data);
1439 /* disable interrupts & free IRQ */
1440 if (data->irq_reg_sts) {
1441 /* disable interrupts */
1442 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
1443 data->irq_reg_sts = false;
1444 free_irq(board_dat->pdev->irq, data);
1445 }
1446
1447 pci_iounmap(board_dat->pdev, data->io_remap_addr);
1448 spi_unregister_master(data->master);
1449
1450 return 0;
1451}
1452#ifdef CONFIG_PM
1453static int pch_spi_pd_suspend(struct platform_device *pd_dev,
1454 pm_message_t state)
1455{
1456 u8 count;
1457 struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev);
1458 struct pch_spi_data *data = platform_get_drvdata(pd_dev);
1459
1460 dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__);
1461
1462 if (!board_dat) {
1463 dev_err(&pd_dev->dev,
1464 "%s pci_get_drvdata returned NULL\n", __func__);
1465 return -EFAULT;
1466 }
1467
1468 /* check if the current message is processed:
1469 Only after thats done the transfer will be suspended */
1470 count = 255;
1471 while ((--count) > 0) {
1472 if (!(data->bcurrent_msg_processing))
1473 break;
1474 msleep(PCH_SLEEP_TIME);
1475 }
1476
1477 /* Free IRQ */
1478 if (data->irq_reg_sts) {
1479 /* disable all interrupts */
1480 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
1481 pch_spi_reset(data->master);
1482 free_irq(board_dat->pdev->irq, data);
1483
1484 data->irq_reg_sts = false;
1485 dev_dbg(&pd_dev->dev,
1486 "%s free_irq invoked successfully.\n", __func__);
1487 }
1488
1489 return 0;
1490}
1491
1492static int pch_spi_pd_resume(struct platform_device *pd_dev)
1493{
1494 struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev);
1495 struct pch_spi_data *data = platform_get_drvdata(pd_dev);
1496 int retval;
1497
1498 if (!board_dat) {
1499 dev_err(&pd_dev->dev,
1500 "%s pci_get_drvdata returned NULL\n", __func__);
1501 return -EFAULT;
1502 }
1503
1504 if (!data->irq_reg_sts) {
1505 /* register IRQ */
1506 retval = request_irq(board_dat->pdev->irq, pch_spi_handler,
1507 IRQF_SHARED, KBUILD_MODNAME, data);
1508 if (retval < 0) {
1509 dev_err(&pd_dev->dev,
1510 "%s request_irq failed\n", __func__);
1511 return retval;
1512 }
1513
1514 /* reset PCH SPI h/w */
1515 pch_spi_reset(data->master);
1516 pch_spi_set_master_mode(data->master);
1517 data->irq_reg_sts = true;
1518 }
1519 return 0;
1520}
1521#else
1522#define pch_spi_pd_suspend NULL
1523#define pch_spi_pd_resume NULL
1524#endif
1525
1526static struct platform_driver pch_spi_pd_driver = {
1527 .driver = {
1528 .name = "pch-spi",
1529 },
1530 .probe = pch_spi_pd_probe,
1531 .remove = pch_spi_pd_remove,
1532 .suspend = pch_spi_pd_suspend,
1533 .resume = pch_spi_pd_resume
1534};
1535
1536static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1537{
1538 struct pch_spi_board_data *board_dat;
1539 struct platform_device *pd_dev = NULL;
1540 int retval;
1541 int i;
1542 struct pch_pd_dev_save *pd_dev_save;
1543
1544 pd_dev_save = kzalloc(sizeof(struct pch_pd_dev_save), GFP_KERNEL);
1545 if (!pd_dev_save)
1546 return -ENOMEM;
1547
1548 board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL);
1549 if (!board_dat) {
1550 retval = -ENOMEM;
1551 goto err_no_mem;
1552 }
1553
1554 retval = pci_request_regions(pdev, KBUILD_MODNAME);
1555 if (retval) {
1556 dev_err(&pdev->dev, "%s request_region failed\n", __func__);
1557 goto pci_request_regions;
1558 }
1559
1560 board_dat->pdev = pdev;
1561 board_dat->num = id->driver_data;
1562 pd_dev_save->num = id->driver_data;
1563 pd_dev_save->board_dat = board_dat;
1564
1565 retval = pci_enable_device(pdev);
1566 if (retval) {
1567 dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__);
1568 goto pci_enable_device;
1569 }
1570
1571 for (i = 0; i < board_dat->num; i++) {
1572 pd_dev = platform_device_alloc("pch-spi", i);
1573 if (!pd_dev) {
1574 dev_err(&pdev->dev, "platform_device_alloc failed\n");
1575 retval = -ENOMEM;
1576 goto err_platform_device;
1577 }
1578 pd_dev_save->pd_save[i] = pd_dev;
1579 pd_dev->dev.parent = &pdev->dev;
1580
1581 retval = platform_device_add_data(pd_dev, board_dat,
1582 sizeof(*board_dat));
1583 if (retval) {
1584 dev_err(&pdev->dev,
1585 "platform_device_add_data failed\n");
1586 platform_device_put(pd_dev);
1587 goto err_platform_device;
1588 }
1589
1590 retval = platform_device_add(pd_dev);
1591 if (retval) {
1592 dev_err(&pdev->dev, "platform_device_add failed\n");
1593 platform_device_put(pd_dev);
1594 goto err_platform_device;
1595 }
1596 }
1597
1598 pci_set_drvdata(pdev, pd_dev_save);
1599
1600 return 0;
1601
1602err_platform_device:
1603 while (--i >= 0)
1604 platform_device_unregister(pd_dev_save->pd_save[i]);
1605 pci_disable_device(pdev);
1606pci_enable_device:
1607 pci_release_regions(pdev);
1608pci_request_regions:
1609 kfree(board_dat);
1610err_no_mem:
1611 kfree(pd_dev_save);
1612
1613 return retval;
1614}
1615
1616static void pch_spi_remove(struct pci_dev *pdev)
1617{
1618 int i;
1619 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1620
1621 dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev);
1622
1623 for (i = 0; i < pd_dev_save->num; i++)
1624 platform_device_unregister(pd_dev_save->pd_save[i]);
1625
1626 pci_disable_device(pdev);
1627 pci_release_regions(pdev);
1628 kfree(pd_dev_save->board_dat);
1629 kfree(pd_dev_save);
1630}
1631
1632#ifdef CONFIG_PM
1633static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
1634{
1635 int retval;
1636 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1637
1638 dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1639
1640 pd_dev_save->board_dat->suspend_sts = true;
1641
1642 /* save config space */
1643 retval = pci_save_state(pdev);
1644 if (retval == 0) {
1645 pci_enable_wake(pdev, PCI_D3hot, 0);
1646 pci_disable_device(pdev);
1647 pci_set_power_state(pdev, PCI_D3hot);
1648 } else {
1649 dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__);
1650 }
1651
1652 return retval;
1653}
1654
1655static int pch_spi_resume(struct pci_dev *pdev)
1656{
1657 int retval;
1658 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1659 dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1660
1661 pci_set_power_state(pdev, PCI_D0);
1662 pci_restore_state(pdev);
1663
1664 retval = pci_enable_device(pdev);
1665 if (retval < 0) {
1666 dev_err(&pdev->dev,
1667 "%s pci_enable_device failed\n", __func__);
1668 } else {
1669 pci_enable_wake(pdev, PCI_D3hot, 0);
1670
1671 /* set suspend status to false */
1672 pd_dev_save->board_dat->suspend_sts = false;
1673 }
1674
1675 return retval;
1676}
1677#else
1678#define pch_spi_suspend NULL
1679#define pch_spi_resume NULL
1680
1681#endif
1682
1683static struct pci_driver pch_spi_pcidev_driver = {
1684 .name = "pch_spi",
1685 .id_table = pch_spi_pcidev_id,
1686 .probe = pch_spi_probe,
1687 .remove = pch_spi_remove,
1688 .suspend = pch_spi_suspend,
1689 .resume = pch_spi_resume,
1690};
1691
1692static int __init pch_spi_init(void)
1693{
1694 int ret;
1695 ret = platform_driver_register(&pch_spi_pd_driver);
1696 if (ret)
1697 return ret;
1698
1699 ret = pci_register_driver(&pch_spi_pcidev_driver);
1700 if (ret) {
1701 platform_driver_unregister(&pch_spi_pd_driver);
1702 return ret;
1703 }
1704
1705 return 0;
1706}
1707module_init(pch_spi_init);
1708
1709static void __exit pch_spi_exit(void)
1710{
1711 pci_unregister_driver(&pch_spi_pcidev_driver);
1712 platform_driver_unregister(&pch_spi_pd_driver);
1713}
1714module_exit(pch_spi_exit);
1715
1716module_param(use_dma, int, 0644);
1717MODULE_PARM_DESC(use_dma,
1718 "to use DMA for data transfers pass 1 else 0; default 1");
1719
1720MODULE_LICENSE("GPL");
1721MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver");
1722MODULE_DEVICE_TABLE(pci, pch_spi_pcidev_id);
1723