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1/*
2 * MPC52xx PSC in SPI mode driver.
3 *
4 * Maintainer: Dragos Carp
5 *
6 * Copyright (C) 2006 TOPTICA Photonics AG.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/errno.h>
17#include <linux/interrupt.h>
18#include <linux/of_address.h>
19#include <linux/of_platform.h>
20#include <linux/workqueue.h>
21#include <linux/completion.h>
22#include <linux/io.h>
23#include <linux/delay.h>
24#include <linux/spi/spi.h>
25#include <linux/fsl_devices.h>
26#include <linux/slab.h>
27
28#include <asm/mpc52xx.h>
29#include <asm/mpc52xx_psc.h>
30
31#define MCLK 20000000 /* PSC port MClk in hz */
32
33struct mpc52xx_psc_spi {
34 /* fsl_spi_platform data */
35 void (*cs_control)(struct spi_device *spi, bool on);
36 u32 sysclk;
37
38 /* driver internal data */
39 struct mpc52xx_psc __iomem *psc;
40 struct mpc52xx_psc_fifo __iomem *fifo;
41 unsigned int irq;
42 u8 bits_per_word;
43 u8 busy;
44
45 struct workqueue_struct *workqueue;
46 struct work_struct work;
47
48 struct list_head queue;
49 spinlock_t lock;
50
51 struct completion done;
52};
53
54/* controller state */
55struct mpc52xx_psc_spi_cs {
56 int bits_per_word;
57 int speed_hz;
58};
59
60/* set clock freq, clock ramp, bits per work
61 * if t is NULL then reset the values to the default values
62 */
63static int mpc52xx_psc_spi_transfer_setup(struct spi_device *spi,
64 struct spi_transfer *t)
65{
66 struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
67
68 cs->speed_hz = (t && t->speed_hz)
69 ? t->speed_hz : spi->max_speed_hz;
70 cs->bits_per_word = (t && t->bits_per_word)
71 ? t->bits_per_word : spi->bits_per_word;
72 cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8;
73 return 0;
74}
75
76static void mpc52xx_psc_spi_activate_cs(struct spi_device *spi)
77{
78 struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
79 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
80 struct mpc52xx_psc __iomem *psc = mps->psc;
81 u32 sicr;
82 u16 ccr;
83
84 sicr = in_be32(&psc->sicr);
85
86 /* Set clock phase and polarity */
87 if (spi->mode & SPI_CPHA)
88 sicr |= 0x00001000;
89 else
90 sicr &= ~0x00001000;
91 if (spi->mode & SPI_CPOL)
92 sicr |= 0x00002000;
93 else
94 sicr &= ~0x00002000;
95
96 if (spi->mode & SPI_LSB_FIRST)
97 sicr |= 0x10000000;
98 else
99 sicr &= ~0x10000000;
100 out_be32(&psc->sicr, sicr);
101
102 /* Set clock frequency and bits per word
103 * Because psc->ccr is defined as 16bit register instead of 32bit
104 * just set the lower byte of BitClkDiv
105 */
106 ccr = in_be16((u16 __iomem *)&psc->ccr);
107 ccr &= 0xFF00;
108 if (cs->speed_hz)
109 ccr |= (MCLK / cs->speed_hz - 1) & 0xFF;
110 else /* by default SPI Clk 1MHz */
111 ccr |= (MCLK / 1000000 - 1) & 0xFF;
112 out_be16((u16 __iomem *)&psc->ccr, ccr);
113 mps->bits_per_word = cs->bits_per_word;
114
115 if (mps->cs_control)
116 mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0);
117}
118
119static void mpc52xx_psc_spi_deactivate_cs(struct spi_device *spi)
120{
121 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
122
123 if (mps->cs_control)
124 mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
125}
126
127#define MPC52xx_PSC_BUFSIZE (MPC52xx_PSC_RFNUM_MASK + 1)
128/* wake up when 80% fifo full */
129#define MPC52xx_PSC_RFALARM (MPC52xx_PSC_BUFSIZE * 20 / 100)
130
131static int mpc52xx_psc_spi_transfer_rxtx(struct spi_device *spi,
132 struct spi_transfer *t)
133{
134 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
135 struct mpc52xx_psc __iomem *psc = mps->psc;
136 struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
137 unsigned rb = 0; /* number of bytes receieved */
138 unsigned sb = 0; /* number of bytes sent */
139 unsigned char *rx_buf = (unsigned char *)t->rx_buf;
140 unsigned char *tx_buf = (unsigned char *)t->tx_buf;
141 unsigned rfalarm;
142 unsigned send_at_once = MPC52xx_PSC_BUFSIZE;
143 unsigned recv_at_once;
144 int last_block = 0;
145
146 if (!t->tx_buf && !t->rx_buf && t->len)
147 return -EINVAL;
148
149 /* enable transmiter/receiver */
150 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
151 while (rb < t->len) {
152 if (t->len - rb > MPC52xx_PSC_BUFSIZE) {
153 rfalarm = MPC52xx_PSC_RFALARM;
154 last_block = 0;
155 } else {
156 send_at_once = t->len - sb;
157 rfalarm = MPC52xx_PSC_BUFSIZE - (t->len - rb);
158 last_block = 1;
159 }
160
161 dev_dbg(&spi->dev, "send %d bytes...\n", send_at_once);
162 for (; send_at_once; sb++, send_at_once--) {
163 /* set EOF flag before the last word is sent */
164 if (send_at_once == 1 && last_block)
165 out_8(&psc->ircr2, 0x01);
166
167 if (tx_buf)
168 out_8(&psc->mpc52xx_psc_buffer_8, tx_buf[sb]);
169 else
170 out_8(&psc->mpc52xx_psc_buffer_8, 0);
171 }
172
173
174 /* enable interrupts and wait for wake up
175 * if just one byte is expected the Rx FIFO genererates no
176 * FFULL interrupt, so activate the RxRDY interrupt
177 */
178 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
179 if (t->len - rb == 1) {
180 out_8(&psc->mode, 0);
181 } else {
182 out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
183 out_be16(&fifo->rfalarm, rfalarm);
184 }
185 out_be16(&psc->mpc52xx_psc_imr, MPC52xx_PSC_IMR_RXRDY);
186 wait_for_completion(&mps->done);
187 recv_at_once = in_be16(&fifo->rfnum);
188 dev_dbg(&spi->dev, "%d bytes received\n", recv_at_once);
189
190 send_at_once = recv_at_once;
191 if (rx_buf) {
192 for (; recv_at_once; rb++, recv_at_once--)
193 rx_buf[rb] = in_8(&psc->mpc52xx_psc_buffer_8);
194 } else {
195 for (; recv_at_once; rb++, recv_at_once--)
196 in_8(&psc->mpc52xx_psc_buffer_8);
197 }
198 }
199 /* disable transmiter/receiver */
200 out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
201
202 return 0;
203}
204
205static void mpc52xx_psc_spi_work(struct work_struct *work)
206{
207 struct mpc52xx_psc_spi *mps =
208 container_of(work, struct mpc52xx_psc_spi, work);
209
210 spin_lock_irq(&mps->lock);
211 mps->busy = 1;
212 while (!list_empty(&mps->queue)) {
213 struct spi_message *m;
214 struct spi_device *spi;
215 struct spi_transfer *t = NULL;
216 unsigned cs_change;
217 int status;
218
219 m = container_of(mps->queue.next, struct spi_message, queue);
220 list_del_init(&m->queue);
221 spin_unlock_irq(&mps->lock);
222
223 spi = m->spi;
224 cs_change = 1;
225 status = 0;
226 list_for_each_entry (t, &m->transfers, transfer_list) {
227 if (t->bits_per_word || t->speed_hz) {
228 status = mpc52xx_psc_spi_transfer_setup(spi, t);
229 if (status < 0)
230 break;
231 }
232
233 if (cs_change)
234 mpc52xx_psc_spi_activate_cs(spi);
235 cs_change = t->cs_change;
236
237 status = mpc52xx_psc_spi_transfer_rxtx(spi, t);
238 if (status)
239 break;
240 m->actual_length += t->len;
241
242 if (t->delay_usecs)
243 udelay(t->delay_usecs);
244
245 if (cs_change)
246 mpc52xx_psc_spi_deactivate_cs(spi);
247 }
248
249 m->status = status;
250 if (m->complete)
251 m->complete(m->context);
252
253 if (status || !cs_change)
254 mpc52xx_psc_spi_deactivate_cs(spi);
255
256 mpc52xx_psc_spi_transfer_setup(spi, NULL);
257
258 spin_lock_irq(&mps->lock);
259 }
260 mps->busy = 0;
261 spin_unlock_irq(&mps->lock);
262}
263
264static int mpc52xx_psc_spi_setup(struct spi_device *spi)
265{
266 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
267 struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
268 unsigned long flags;
269
270 if (spi->bits_per_word%8)
271 return -EINVAL;
272
273 if (!cs) {
274 cs = kzalloc(sizeof *cs, GFP_KERNEL);
275 if (!cs)
276 return -ENOMEM;
277 spi->controller_state = cs;
278 }
279
280 cs->bits_per_word = spi->bits_per_word;
281 cs->speed_hz = spi->max_speed_hz;
282
283 spin_lock_irqsave(&mps->lock, flags);
284 if (!mps->busy)
285 mpc52xx_psc_spi_deactivate_cs(spi);
286 spin_unlock_irqrestore(&mps->lock, flags);
287
288 return 0;
289}
290
291static int mpc52xx_psc_spi_transfer(struct spi_device *spi,
292 struct spi_message *m)
293{
294 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
295 unsigned long flags;
296
297 m->actual_length = 0;
298 m->status = -EINPROGRESS;
299
300 spin_lock_irqsave(&mps->lock, flags);
301 list_add_tail(&m->queue, &mps->queue);
302 queue_work(mps->workqueue, &mps->work);
303 spin_unlock_irqrestore(&mps->lock, flags);
304
305 return 0;
306}
307
308static void mpc52xx_psc_spi_cleanup(struct spi_device *spi)
309{
310 kfree(spi->controller_state);
311}
312
313static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps)
314{
315 struct mpc52xx_psc __iomem *psc = mps->psc;
316 struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
317 u32 mclken_div;
318 int ret;
319
320 /* default sysclk is 512MHz */
321 mclken_div = (mps->sysclk ? mps->sysclk : 512000000) / MCLK;
322 ret = mpc52xx_set_psc_clkdiv(psc_id, mclken_div);
323 if (ret)
324 return ret;
325
326 /* Reset the PSC into a known state */
327 out_8(&psc->command, MPC52xx_PSC_RST_RX);
328 out_8(&psc->command, MPC52xx_PSC_RST_TX);
329 out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
330
331 /* Disable interrupts, interrupts are based on alarm level */
332 out_be16(&psc->mpc52xx_psc_imr, 0);
333 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
334 out_8(&fifo->rfcntl, 0);
335 out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
336
337 /* Configure 8bit codec mode as a SPI master and use EOF flags */
338 /* SICR_SIM_CODEC8|SICR_GENCLK|SICR_SPI|SICR_MSTR|SICR_USEEOF */
339 out_be32(&psc->sicr, 0x0180C800);
340 out_be16((u16 __iomem *)&psc->ccr, 0x070F); /* default SPI Clk 1MHz */
341
342 /* Set 2ms DTL delay */
343 out_8(&psc->ctur, 0x00);
344 out_8(&psc->ctlr, 0x84);
345
346 mps->bits_per_word = 8;
347
348 return 0;
349}
350
351static irqreturn_t mpc52xx_psc_spi_isr(int irq, void *dev_id)
352{
353 struct mpc52xx_psc_spi *mps = (struct mpc52xx_psc_spi *)dev_id;
354 struct mpc52xx_psc __iomem *psc = mps->psc;
355
356 /* disable interrupt and wake up the work queue */
357 if (in_be16(&psc->mpc52xx_psc_isr) & MPC52xx_PSC_IMR_RXRDY) {
358 out_be16(&psc->mpc52xx_psc_imr, 0);
359 complete(&mps->done);
360 return IRQ_HANDLED;
361 }
362 return IRQ_NONE;
363}
364
365/* bus_num is used only for the case dev->platform_data == NULL */
366static int mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
367 u32 size, unsigned int irq, s16 bus_num)
368{
369 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
370 struct mpc52xx_psc_spi *mps;
371 struct spi_master *master;
372 int ret;
373
374 master = spi_alloc_master(dev, sizeof *mps);
375 if (master == NULL)
376 return -ENOMEM;
377
378 dev_set_drvdata(dev, master);
379 mps = spi_master_get_devdata(master);
380
381 /* the spi->mode bits understood by this driver: */
382 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
383
384 mps->irq = irq;
385 if (pdata == NULL) {
386 dev_warn(dev,
387 "probe called without platform data, no cs_control function will be called\n");
388 mps->cs_control = NULL;
389 mps->sysclk = 0;
390 master->bus_num = bus_num;
391 master->num_chipselect = 255;
392 } else {
393 mps->cs_control = pdata->cs_control;
394 mps->sysclk = pdata->sysclk;
395 master->bus_num = pdata->bus_num;
396 master->num_chipselect = pdata->max_chipselect;
397 }
398 master->setup = mpc52xx_psc_spi_setup;
399 master->transfer = mpc52xx_psc_spi_transfer;
400 master->cleanup = mpc52xx_psc_spi_cleanup;
401 master->dev.of_node = dev->of_node;
402
403 mps->psc = ioremap(regaddr, size);
404 if (!mps->psc) {
405 dev_err(dev, "could not ioremap I/O port range\n");
406 ret = -EFAULT;
407 goto free_master;
408 }
409 /* On the 5200, fifo regs are immediately ajacent to the psc regs */
410 mps->fifo = ((void __iomem *)mps->psc) + sizeof(struct mpc52xx_psc);
411
412 ret = request_irq(mps->irq, mpc52xx_psc_spi_isr, 0, "mpc52xx-psc-spi",
413 mps);
414 if (ret)
415 goto free_master;
416
417 ret = mpc52xx_psc_spi_port_config(master->bus_num, mps);
418 if (ret < 0) {
419 dev_err(dev, "can't configure PSC! Is it capable of SPI?\n");
420 goto free_irq;
421 }
422
423 spin_lock_init(&mps->lock);
424 init_completion(&mps->done);
425 INIT_WORK(&mps->work, mpc52xx_psc_spi_work);
426 INIT_LIST_HEAD(&mps->queue);
427
428 mps->workqueue = create_singlethread_workqueue(
429 dev_name(master->dev.parent));
430 if (mps->workqueue == NULL) {
431 ret = -EBUSY;
432 goto free_irq;
433 }
434
435 ret = spi_register_master(master);
436 if (ret < 0)
437 goto unreg_master;
438
439 return ret;
440
441unreg_master:
442 destroy_workqueue(mps->workqueue);
443free_irq:
444 free_irq(mps->irq, mps);
445free_master:
446 if (mps->psc)
447 iounmap(mps->psc);
448 spi_master_put(master);
449
450 return ret;
451}
452
453static int mpc52xx_psc_spi_of_probe(struct platform_device *op)
454{
455 const u32 *regaddr_p;
456 u64 regaddr64, size64;
457 s16 id = -1;
458
459 regaddr_p = of_get_address(op->dev.of_node, 0, &size64, NULL);
460 if (!regaddr_p) {
461 dev_err(&op->dev, "Invalid PSC address\n");
462 return -EINVAL;
463 }
464 regaddr64 = of_translate_address(op->dev.of_node, regaddr_p);
465
466 /* get PSC id (1..6, used by port_config) */
467 if (op->dev.platform_data == NULL) {
468 const u32 *psc_nump;
469
470 psc_nump = of_get_property(op->dev.of_node, "cell-index", NULL);
471 if (!psc_nump || *psc_nump > 5) {
472 dev_err(&op->dev, "Invalid cell-index property\n");
473 return -EINVAL;
474 }
475 id = *psc_nump + 1;
476 }
477
478 return mpc52xx_psc_spi_do_probe(&op->dev, (u32)regaddr64, (u32)size64,
479 irq_of_parse_and_map(op->dev.of_node, 0), id);
480}
481
482static int mpc52xx_psc_spi_of_remove(struct platform_device *op)
483{
484 struct spi_master *master = spi_master_get(platform_get_drvdata(op));
485 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master);
486
487 flush_workqueue(mps->workqueue);
488 destroy_workqueue(mps->workqueue);
489 spi_unregister_master(master);
490 free_irq(mps->irq, mps);
491 if (mps->psc)
492 iounmap(mps->psc);
493 spi_master_put(master);
494
495 return 0;
496}
497
498static const struct of_device_id mpc52xx_psc_spi_of_match[] = {
499 { .compatible = "fsl,mpc5200-psc-spi", },
500 { .compatible = "mpc5200-psc-spi", }, /* old */
501 {}
502};
503
504MODULE_DEVICE_TABLE(of, mpc52xx_psc_spi_of_match);
505
506static struct platform_driver mpc52xx_psc_spi_of_driver = {
507 .probe = mpc52xx_psc_spi_of_probe,
508 .remove = mpc52xx_psc_spi_of_remove,
509 .driver = {
510 .name = "mpc52xx-psc-spi",
511 .of_match_table = mpc52xx_psc_spi_of_match,
512 },
513};
514module_platform_driver(mpc52xx_psc_spi_of_driver);
515
516MODULE_AUTHOR("Dragos Carp");
517MODULE_DESCRIPTION("MPC52xx PSC SPI Driver");
518MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * MPC52xx PSC in SPI mode driver.
4 *
5 * Maintainer: Dragos Carp
6 *
7 * Copyright (C) 2006 TOPTICA Photonics AG.
8 */
9
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/errno.h>
13#include <linux/interrupt.h>
14#include <linux/of_address.h>
15#include <linux/of_platform.h>
16#include <linux/workqueue.h>
17#include <linux/completion.h>
18#include <linux/io.h>
19#include <linux/delay.h>
20#include <linux/spi/spi.h>
21#include <linux/fsl_devices.h>
22#include <linux/slab.h>
23
24#include <asm/mpc52xx.h>
25#include <asm/mpc52xx_psc.h>
26
27#define MCLK 20000000 /* PSC port MClk in hz */
28
29struct mpc52xx_psc_spi {
30 /* fsl_spi_platform data */
31 void (*cs_control)(struct spi_device *spi, bool on);
32 u32 sysclk;
33
34 /* driver internal data */
35 struct mpc52xx_psc __iomem *psc;
36 struct mpc52xx_psc_fifo __iomem *fifo;
37 unsigned int irq;
38 u8 bits_per_word;
39 u8 busy;
40
41 struct work_struct work;
42
43 struct list_head queue;
44 spinlock_t lock;
45
46 struct completion done;
47};
48
49/* controller state */
50struct mpc52xx_psc_spi_cs {
51 int bits_per_word;
52 int speed_hz;
53};
54
55/* set clock freq, clock ramp, bits per work
56 * if t is NULL then reset the values to the default values
57 */
58static int mpc52xx_psc_spi_transfer_setup(struct spi_device *spi,
59 struct spi_transfer *t)
60{
61 struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
62
63 cs->speed_hz = (t && t->speed_hz)
64 ? t->speed_hz : spi->max_speed_hz;
65 cs->bits_per_word = (t && t->bits_per_word)
66 ? t->bits_per_word : spi->bits_per_word;
67 cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8;
68 return 0;
69}
70
71static void mpc52xx_psc_spi_activate_cs(struct spi_device *spi)
72{
73 struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
74 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
75 struct mpc52xx_psc __iomem *psc = mps->psc;
76 u32 sicr;
77 u16 ccr;
78
79 sicr = in_be32(&psc->sicr);
80
81 /* Set clock phase and polarity */
82 if (spi->mode & SPI_CPHA)
83 sicr |= 0x00001000;
84 else
85 sicr &= ~0x00001000;
86 if (spi->mode & SPI_CPOL)
87 sicr |= 0x00002000;
88 else
89 sicr &= ~0x00002000;
90
91 if (spi->mode & SPI_LSB_FIRST)
92 sicr |= 0x10000000;
93 else
94 sicr &= ~0x10000000;
95 out_be32(&psc->sicr, sicr);
96
97 /* Set clock frequency and bits per word
98 * Because psc->ccr is defined as 16bit register instead of 32bit
99 * just set the lower byte of BitClkDiv
100 */
101 ccr = in_be16((u16 __iomem *)&psc->ccr);
102 ccr &= 0xFF00;
103 if (cs->speed_hz)
104 ccr |= (MCLK / cs->speed_hz - 1) & 0xFF;
105 else /* by default SPI Clk 1MHz */
106 ccr |= (MCLK / 1000000 - 1) & 0xFF;
107 out_be16((u16 __iomem *)&psc->ccr, ccr);
108 mps->bits_per_word = cs->bits_per_word;
109
110 if (mps->cs_control)
111 mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0);
112}
113
114static void mpc52xx_psc_spi_deactivate_cs(struct spi_device *spi)
115{
116 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
117
118 if (mps->cs_control)
119 mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
120}
121
122#define MPC52xx_PSC_BUFSIZE (MPC52xx_PSC_RFNUM_MASK + 1)
123/* wake up when 80% fifo full */
124#define MPC52xx_PSC_RFALARM (MPC52xx_PSC_BUFSIZE * 20 / 100)
125
126static int mpc52xx_psc_spi_transfer_rxtx(struct spi_device *spi,
127 struct spi_transfer *t)
128{
129 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
130 struct mpc52xx_psc __iomem *psc = mps->psc;
131 struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
132 unsigned rb = 0; /* number of bytes receieved */
133 unsigned sb = 0; /* number of bytes sent */
134 unsigned char *rx_buf = (unsigned char *)t->rx_buf;
135 unsigned char *tx_buf = (unsigned char *)t->tx_buf;
136 unsigned rfalarm;
137 unsigned send_at_once = MPC52xx_PSC_BUFSIZE;
138 unsigned recv_at_once;
139 int last_block = 0;
140
141 if (!t->tx_buf && !t->rx_buf && t->len)
142 return -EINVAL;
143
144 /* enable transmiter/receiver */
145 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
146 while (rb < t->len) {
147 if (t->len - rb > MPC52xx_PSC_BUFSIZE) {
148 rfalarm = MPC52xx_PSC_RFALARM;
149 last_block = 0;
150 } else {
151 send_at_once = t->len - sb;
152 rfalarm = MPC52xx_PSC_BUFSIZE - (t->len - rb);
153 last_block = 1;
154 }
155
156 dev_dbg(&spi->dev, "send %d bytes...\n", send_at_once);
157 for (; send_at_once; sb++, send_at_once--) {
158 /* set EOF flag before the last word is sent */
159 if (send_at_once == 1 && last_block)
160 out_8(&psc->ircr2, 0x01);
161
162 if (tx_buf)
163 out_8(&psc->mpc52xx_psc_buffer_8, tx_buf[sb]);
164 else
165 out_8(&psc->mpc52xx_psc_buffer_8, 0);
166 }
167
168
169 /* enable interrupts and wait for wake up
170 * if just one byte is expected the Rx FIFO genererates no
171 * FFULL interrupt, so activate the RxRDY interrupt
172 */
173 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
174 if (t->len - rb == 1) {
175 out_8(&psc->mode, 0);
176 } else {
177 out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
178 out_be16(&fifo->rfalarm, rfalarm);
179 }
180 out_be16(&psc->mpc52xx_psc_imr, MPC52xx_PSC_IMR_RXRDY);
181 wait_for_completion(&mps->done);
182 recv_at_once = in_be16(&fifo->rfnum);
183 dev_dbg(&spi->dev, "%d bytes received\n", recv_at_once);
184
185 send_at_once = recv_at_once;
186 if (rx_buf) {
187 for (; recv_at_once; rb++, recv_at_once--)
188 rx_buf[rb] = in_8(&psc->mpc52xx_psc_buffer_8);
189 } else {
190 for (; recv_at_once; rb++, recv_at_once--)
191 in_8(&psc->mpc52xx_psc_buffer_8);
192 }
193 }
194 /* disable transmiter/receiver */
195 out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
196
197 return 0;
198}
199
200static void mpc52xx_psc_spi_work(struct work_struct *work)
201{
202 struct mpc52xx_psc_spi *mps =
203 container_of(work, struct mpc52xx_psc_spi, work);
204
205 spin_lock_irq(&mps->lock);
206 mps->busy = 1;
207 while (!list_empty(&mps->queue)) {
208 struct spi_message *m;
209 struct spi_device *spi;
210 struct spi_transfer *t = NULL;
211 unsigned cs_change;
212 int status;
213
214 m = container_of(mps->queue.next, struct spi_message, queue);
215 list_del_init(&m->queue);
216 spin_unlock_irq(&mps->lock);
217
218 spi = m->spi;
219 cs_change = 1;
220 status = 0;
221 list_for_each_entry (t, &m->transfers, transfer_list) {
222 if (t->bits_per_word || t->speed_hz) {
223 status = mpc52xx_psc_spi_transfer_setup(spi, t);
224 if (status < 0)
225 break;
226 }
227
228 if (cs_change)
229 mpc52xx_psc_spi_activate_cs(spi);
230 cs_change = t->cs_change;
231
232 status = mpc52xx_psc_spi_transfer_rxtx(spi, t);
233 if (status)
234 break;
235 m->actual_length += t->len;
236
237 spi_transfer_delay_exec(t);
238
239 if (cs_change)
240 mpc52xx_psc_spi_deactivate_cs(spi);
241 }
242
243 m->status = status;
244 if (m->complete)
245 m->complete(m->context);
246
247 if (status || !cs_change)
248 mpc52xx_psc_spi_deactivate_cs(spi);
249
250 mpc52xx_psc_spi_transfer_setup(spi, NULL);
251
252 spin_lock_irq(&mps->lock);
253 }
254 mps->busy = 0;
255 spin_unlock_irq(&mps->lock);
256}
257
258static int mpc52xx_psc_spi_setup(struct spi_device *spi)
259{
260 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
261 struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
262 unsigned long flags;
263
264 if (spi->bits_per_word%8)
265 return -EINVAL;
266
267 if (!cs) {
268 cs = kzalloc(sizeof *cs, GFP_KERNEL);
269 if (!cs)
270 return -ENOMEM;
271 spi->controller_state = cs;
272 }
273
274 cs->bits_per_word = spi->bits_per_word;
275 cs->speed_hz = spi->max_speed_hz;
276
277 spin_lock_irqsave(&mps->lock, flags);
278 if (!mps->busy)
279 mpc52xx_psc_spi_deactivate_cs(spi);
280 spin_unlock_irqrestore(&mps->lock, flags);
281
282 return 0;
283}
284
285static int mpc52xx_psc_spi_transfer(struct spi_device *spi,
286 struct spi_message *m)
287{
288 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
289 unsigned long flags;
290
291 m->actual_length = 0;
292 m->status = -EINPROGRESS;
293
294 spin_lock_irqsave(&mps->lock, flags);
295 list_add_tail(&m->queue, &mps->queue);
296 schedule_work(&mps->work);
297 spin_unlock_irqrestore(&mps->lock, flags);
298
299 return 0;
300}
301
302static void mpc52xx_psc_spi_cleanup(struct spi_device *spi)
303{
304 kfree(spi->controller_state);
305}
306
307static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps)
308{
309 struct mpc52xx_psc __iomem *psc = mps->psc;
310 struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
311 u32 mclken_div;
312 int ret;
313
314 /* default sysclk is 512MHz */
315 mclken_div = (mps->sysclk ? mps->sysclk : 512000000) / MCLK;
316 ret = mpc52xx_set_psc_clkdiv(psc_id, mclken_div);
317 if (ret)
318 return ret;
319
320 /* Reset the PSC into a known state */
321 out_8(&psc->command, MPC52xx_PSC_RST_RX);
322 out_8(&psc->command, MPC52xx_PSC_RST_TX);
323 out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
324
325 /* Disable interrupts, interrupts are based on alarm level */
326 out_be16(&psc->mpc52xx_psc_imr, 0);
327 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
328 out_8(&fifo->rfcntl, 0);
329 out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
330
331 /* Configure 8bit codec mode as a SPI master and use EOF flags */
332 /* SICR_SIM_CODEC8|SICR_GENCLK|SICR_SPI|SICR_MSTR|SICR_USEEOF */
333 out_be32(&psc->sicr, 0x0180C800);
334 out_be16((u16 __iomem *)&psc->ccr, 0x070F); /* default SPI Clk 1MHz */
335
336 /* Set 2ms DTL delay */
337 out_8(&psc->ctur, 0x00);
338 out_8(&psc->ctlr, 0x84);
339
340 mps->bits_per_word = 8;
341
342 return 0;
343}
344
345static irqreturn_t mpc52xx_psc_spi_isr(int irq, void *dev_id)
346{
347 struct mpc52xx_psc_spi *mps = (struct mpc52xx_psc_spi *)dev_id;
348 struct mpc52xx_psc __iomem *psc = mps->psc;
349
350 /* disable interrupt and wake up the work queue */
351 if (in_be16(&psc->mpc52xx_psc_isr) & MPC52xx_PSC_IMR_RXRDY) {
352 out_be16(&psc->mpc52xx_psc_imr, 0);
353 complete(&mps->done);
354 return IRQ_HANDLED;
355 }
356 return IRQ_NONE;
357}
358
359/* bus_num is used only for the case dev->platform_data == NULL */
360static int mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
361 u32 size, unsigned int irq, s16 bus_num)
362{
363 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
364 struct mpc52xx_psc_spi *mps;
365 struct spi_master *master;
366 int ret;
367
368 master = spi_alloc_master(dev, sizeof *mps);
369 if (master == NULL)
370 return -ENOMEM;
371
372 dev_set_drvdata(dev, master);
373 mps = spi_master_get_devdata(master);
374
375 /* the spi->mode bits understood by this driver: */
376 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
377
378 mps->irq = irq;
379 if (pdata == NULL) {
380 dev_warn(dev,
381 "probe called without platform data, no cs_control function will be called\n");
382 mps->cs_control = NULL;
383 mps->sysclk = 0;
384 master->bus_num = bus_num;
385 master->num_chipselect = 255;
386 } else {
387 mps->cs_control = pdata->cs_control;
388 mps->sysclk = pdata->sysclk;
389 master->bus_num = pdata->bus_num;
390 master->num_chipselect = pdata->max_chipselect;
391 }
392 master->setup = mpc52xx_psc_spi_setup;
393 master->transfer = mpc52xx_psc_spi_transfer;
394 master->cleanup = mpc52xx_psc_spi_cleanup;
395 master->dev.of_node = dev->of_node;
396
397 mps->psc = ioremap(regaddr, size);
398 if (!mps->psc) {
399 dev_err(dev, "could not ioremap I/O port range\n");
400 ret = -EFAULT;
401 goto free_master;
402 }
403 /* On the 5200, fifo regs are immediately ajacent to the psc regs */
404 mps->fifo = ((void __iomem *)mps->psc) + sizeof(struct mpc52xx_psc);
405
406 ret = request_irq(mps->irq, mpc52xx_psc_spi_isr, 0, "mpc52xx-psc-spi",
407 mps);
408 if (ret)
409 goto free_master;
410
411 ret = mpc52xx_psc_spi_port_config(master->bus_num, mps);
412 if (ret < 0) {
413 dev_err(dev, "can't configure PSC! Is it capable of SPI?\n");
414 goto free_irq;
415 }
416
417 spin_lock_init(&mps->lock);
418 init_completion(&mps->done);
419 INIT_WORK(&mps->work, mpc52xx_psc_spi_work);
420 INIT_LIST_HEAD(&mps->queue);
421
422 ret = spi_register_master(master);
423 if (ret < 0)
424 goto free_irq;
425
426 return ret;
427
428free_irq:
429 free_irq(mps->irq, mps);
430free_master:
431 if (mps->psc)
432 iounmap(mps->psc);
433 spi_master_put(master);
434
435 return ret;
436}
437
438static int mpc52xx_psc_spi_of_probe(struct platform_device *op)
439{
440 const u32 *regaddr_p;
441 u64 regaddr64, size64;
442 s16 id = -1;
443
444 regaddr_p = of_get_address(op->dev.of_node, 0, &size64, NULL);
445 if (!regaddr_p) {
446 dev_err(&op->dev, "Invalid PSC address\n");
447 return -EINVAL;
448 }
449 regaddr64 = of_translate_address(op->dev.of_node, regaddr_p);
450
451 /* get PSC id (1..6, used by port_config) */
452 if (op->dev.platform_data == NULL) {
453 const u32 *psc_nump;
454
455 psc_nump = of_get_property(op->dev.of_node, "cell-index", NULL);
456 if (!psc_nump || *psc_nump > 5) {
457 dev_err(&op->dev, "Invalid cell-index property\n");
458 return -EINVAL;
459 }
460 id = *psc_nump + 1;
461 }
462
463 return mpc52xx_psc_spi_do_probe(&op->dev, (u32)regaddr64, (u32)size64,
464 irq_of_parse_and_map(op->dev.of_node, 0), id);
465}
466
467static int mpc52xx_psc_spi_of_remove(struct platform_device *op)
468{
469 struct spi_master *master = spi_master_get(platform_get_drvdata(op));
470 struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master);
471
472 flush_work(&mps->work);
473 spi_unregister_master(master);
474 free_irq(mps->irq, mps);
475 if (mps->psc)
476 iounmap(mps->psc);
477 spi_master_put(master);
478
479 return 0;
480}
481
482static const struct of_device_id mpc52xx_psc_spi_of_match[] = {
483 { .compatible = "fsl,mpc5200-psc-spi", },
484 { .compatible = "mpc5200-psc-spi", }, /* old */
485 {}
486};
487
488MODULE_DEVICE_TABLE(of, mpc52xx_psc_spi_of_match);
489
490static struct platform_driver mpc52xx_psc_spi_of_driver = {
491 .probe = mpc52xx_psc_spi_of_probe,
492 .remove = mpc52xx_psc_spi_of_remove,
493 .driver = {
494 .name = "mpc52xx-psc-spi",
495 .of_match_table = mpc52xx_psc_spi_of_match,
496 },
497};
498module_platform_driver(mpc52xx_psc_spi_of_driver);
499
500MODULE_AUTHOR("Dragos Carp");
501MODULE_DESCRIPTION("MPC52xx PSC SPI Driver");
502MODULE_LICENSE("GPL");