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1/*
2 * Freescale SPI controller driver cpm functions.
3 *
4 * Maintainer: Kumar Gala
5 *
6 * Copyright (C) 2006 Polycom, Inc.
7 * Copyright 2010 Freescale Semiconductor, Inc.
8 *
9 * CPM SPI and QE buffer descriptors mode support:
10 * Copyright (c) 2009 MontaVista Software, Inc.
11 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
17 */
18#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/spi/spi.h>
21#include <linux/fsl_devices.h>
22#include <linux/dma-mapping.h>
23#include <linux/of_address.h>
24#include <asm/cpm.h>
25#include <asm/qe.h>
26
27#include "spi-fsl-lib.h"
28#include "spi-fsl-cpm.h"
29#include "spi-fsl-spi.h"
30
31/* CPM1 and CPM2 are mutually exclusive. */
32#ifdef CONFIG_CPM1
33#include <asm/cpm1.h>
34#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0)
35#else
36#include <asm/cpm2.h>
37#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0)
38#endif
39
40#define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */
41#define SPIE_RXB 0x00000100 /* Last char is written to rx buf */
42
43/* SPCOM register values */
44#define SPCOM_STR (1 << 23) /* Start transmit */
45
46#define SPI_PRAM_SIZE 0x100
47#define SPI_MRBLR ((unsigned int)PAGE_SIZE)
48
49static void *fsl_dummy_rx;
50static DEFINE_MUTEX(fsl_dummy_rx_lock);
51static int fsl_dummy_rx_refcnt;
52
53void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi)
54{
55 if (mspi->flags & SPI_QE) {
56 qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock,
57 QE_CR_PROTOCOL_UNSPECIFIED, 0);
58 } else {
59 cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
60 if (mspi->flags & SPI_CPM1) {
61 out_be16(&mspi->pram->rbptr,
62 in_be16(&mspi->pram->rbase));
63 out_be16(&mspi->pram->tbptr,
64 in_be16(&mspi->pram->tbase));
65 }
66 }
67}
68
69static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
70{
71 struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd;
72 struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd;
73 unsigned int xfer_len = min(mspi->count, SPI_MRBLR);
74 unsigned int xfer_ofs;
75 struct fsl_spi_reg *reg_base = mspi->reg_base;
76
77 xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
78
79 if (mspi->rx_dma == mspi->dma_dummy_rx)
80 out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
81 else
82 out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
83 out_be16(&rx_bd->cbd_datlen, 0);
84 out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);
85
86 if (mspi->tx_dma == mspi->dma_dummy_tx)
87 out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
88 else
89 out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
90 out_be16(&tx_bd->cbd_datlen, xfer_len);
91 out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
92 BD_SC_LAST);
93
94 /* start transfer */
95 mpc8xxx_spi_write_reg(®_base->command, SPCOM_STR);
96}
97
98int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
99 struct spi_transfer *t, bool is_dma_mapped)
100{
101 struct device *dev = mspi->dev;
102 struct fsl_spi_reg *reg_base = mspi->reg_base;
103
104 if (is_dma_mapped) {
105 mspi->map_tx_dma = 0;
106 mspi->map_rx_dma = 0;
107 } else {
108 mspi->map_tx_dma = 1;
109 mspi->map_rx_dma = 1;
110 }
111
112 if (!t->tx_buf) {
113 mspi->tx_dma = mspi->dma_dummy_tx;
114 mspi->map_tx_dma = 0;
115 }
116
117 if (!t->rx_buf) {
118 mspi->rx_dma = mspi->dma_dummy_rx;
119 mspi->map_rx_dma = 0;
120 }
121
122 if (mspi->map_tx_dma) {
123 void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */
124
125 mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len,
126 DMA_TO_DEVICE);
127 if (dma_mapping_error(dev, mspi->tx_dma)) {
128 dev_err(dev, "unable to map tx dma\n");
129 return -ENOMEM;
130 }
131 } else if (t->tx_buf) {
132 mspi->tx_dma = t->tx_dma;
133 }
134
135 if (mspi->map_rx_dma) {
136 mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len,
137 DMA_FROM_DEVICE);
138 if (dma_mapping_error(dev, mspi->rx_dma)) {
139 dev_err(dev, "unable to map rx dma\n");
140 goto err_rx_dma;
141 }
142 } else if (t->rx_buf) {
143 mspi->rx_dma = t->rx_dma;
144 }
145
146 /* enable rx ints */
147 mpc8xxx_spi_write_reg(®_base->mask, SPIE_RXB);
148
149 mspi->xfer_in_progress = t;
150 mspi->count = t->len;
151
152 /* start CPM transfers */
153 fsl_spi_cpm_bufs_start(mspi);
154
155 return 0;
156
157err_rx_dma:
158 if (mspi->map_tx_dma)
159 dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
160 return -ENOMEM;
161}
162
163void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
164{
165 struct device *dev = mspi->dev;
166 struct spi_transfer *t = mspi->xfer_in_progress;
167
168 if (mspi->map_tx_dma)
169 dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
170 if (mspi->map_rx_dma)
171 dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
172 mspi->xfer_in_progress = NULL;
173}
174
175void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events)
176{
177 u16 len;
178 struct fsl_spi_reg *reg_base = mspi->reg_base;
179
180 dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__,
181 in_be16(&mspi->rx_bd->cbd_datlen), mspi->count);
182
183 len = in_be16(&mspi->rx_bd->cbd_datlen);
184 if (len > mspi->count) {
185 WARN_ON(1);
186 len = mspi->count;
187 }
188
189 /* Clear the events */
190 mpc8xxx_spi_write_reg(®_base->event, events);
191
192 mspi->count -= len;
193 if (mspi->count)
194 fsl_spi_cpm_bufs_start(mspi);
195 else
196 complete(&mspi->done);
197}
198
199static void *fsl_spi_alloc_dummy_rx(void)
200{
201 mutex_lock(&fsl_dummy_rx_lock);
202
203 if (!fsl_dummy_rx)
204 fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL);
205 if (fsl_dummy_rx)
206 fsl_dummy_rx_refcnt++;
207
208 mutex_unlock(&fsl_dummy_rx_lock);
209
210 return fsl_dummy_rx;
211}
212
213static void fsl_spi_free_dummy_rx(void)
214{
215 mutex_lock(&fsl_dummy_rx_lock);
216
217 switch (fsl_dummy_rx_refcnt) {
218 case 0:
219 WARN_ON(1);
220 break;
221 case 1:
222 kfree(fsl_dummy_rx);
223 fsl_dummy_rx = NULL;
224 /* fall through */
225 default:
226 fsl_dummy_rx_refcnt--;
227 break;
228 }
229
230 mutex_unlock(&fsl_dummy_rx_lock);
231}
232
233static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
234{
235 struct device *dev = mspi->dev;
236 struct device_node *np = dev->of_node;
237 const u32 *iprop;
238 int size;
239 void __iomem *spi_base;
240 unsigned long pram_ofs = -ENOMEM;
241
242 /* Can't use of_address_to_resource(), QE muram isn't at 0. */
243 iprop = of_get_property(np, "reg", &size);
244
245 /* QE with a fixed pram location? */
246 if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4)
247 return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE);
248
249 /* QE but with a dynamic pram location? */
250 if (mspi->flags & SPI_QE) {
251 pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
252 qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock,
253 QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs);
254 return pram_ofs;
255 }
256
257 spi_base = of_iomap(np, 1);
258 if (spi_base == NULL)
259 return -EINVAL;
260
261 if (mspi->flags & SPI_CPM2) {
262 pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
263 out_be16(spi_base, pram_ofs);
264 } else {
265 struct spi_pram __iomem *pram = spi_base;
266 u16 rpbase = in_be16(&pram->rpbase);
267
268 /* Microcode relocation patch applied? */
269 if (rpbase) {
270 pram_ofs = rpbase;
271 } else {
272 pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
273 out_be16(spi_base, pram_ofs);
274 }
275 }
276
277 iounmap(spi_base);
278 return pram_ofs;
279}
280
281int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
282{
283 struct device *dev = mspi->dev;
284 struct device_node *np = dev->of_node;
285 const u32 *iprop;
286 int size;
287 unsigned long pram_ofs;
288 unsigned long bds_ofs;
289
290 if (!(mspi->flags & SPI_CPM_MODE))
291 return 0;
292
293 if (!fsl_spi_alloc_dummy_rx())
294 return -ENOMEM;
295
296 if (mspi->flags & SPI_QE) {
297 iprop = of_get_property(np, "cell-index", &size);
298 if (iprop && size == sizeof(*iprop))
299 mspi->subblock = *iprop;
300
301 switch (mspi->subblock) {
302 default:
303 dev_warn(dev, "cell-index unspecified, assuming SPI1\n");
304 /* fall through */
305 case 0:
306 mspi->subblock = QE_CR_SUBBLOCK_SPI1;
307 break;
308 case 1:
309 mspi->subblock = QE_CR_SUBBLOCK_SPI2;
310 break;
311 }
312 }
313
314 pram_ofs = fsl_spi_cpm_get_pram(mspi);
315 if (IS_ERR_VALUE(pram_ofs)) {
316 dev_err(dev, "can't allocate spi parameter ram\n");
317 goto err_pram;
318 }
319
320 bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) +
321 sizeof(*mspi->rx_bd), 8);
322 if (IS_ERR_VALUE(bds_ofs)) {
323 dev_err(dev, "can't allocate bds\n");
324 goto err_bds;
325 }
326
327 mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE,
328 DMA_TO_DEVICE);
329 if (dma_mapping_error(dev, mspi->dma_dummy_tx)) {
330 dev_err(dev, "unable to map dummy tx buffer\n");
331 goto err_dummy_tx;
332 }
333
334 mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR,
335 DMA_FROM_DEVICE);
336 if (dma_mapping_error(dev, mspi->dma_dummy_rx)) {
337 dev_err(dev, "unable to map dummy rx buffer\n");
338 goto err_dummy_rx;
339 }
340
341 mspi->pram = cpm_muram_addr(pram_ofs);
342
343 mspi->tx_bd = cpm_muram_addr(bds_ofs);
344 mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));
345
346 /* Initialize parameter ram. */
347 out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd));
348 out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd));
349 out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL);
350 out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL);
351 out_be16(&mspi->pram->mrblr, SPI_MRBLR);
352 out_be32(&mspi->pram->rstate, 0);
353 out_be32(&mspi->pram->rdp, 0);
354 out_be16(&mspi->pram->rbptr, 0);
355 out_be16(&mspi->pram->rbc, 0);
356 out_be32(&mspi->pram->rxtmp, 0);
357 out_be32(&mspi->pram->tstate, 0);
358 out_be32(&mspi->pram->tdp, 0);
359 out_be16(&mspi->pram->tbptr, 0);
360 out_be16(&mspi->pram->tbc, 0);
361 out_be32(&mspi->pram->txtmp, 0);
362
363 return 0;
364
365err_dummy_rx:
366 dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
367err_dummy_tx:
368 cpm_muram_free(bds_ofs);
369err_bds:
370 cpm_muram_free(pram_ofs);
371err_pram:
372 fsl_spi_free_dummy_rx();
373 return -ENOMEM;
374}
375
376void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi)
377{
378 struct device *dev = mspi->dev;
379
380 if (!(mspi->flags & SPI_CPM_MODE))
381 return;
382
383 dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
384 dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
385 cpm_muram_free(cpm_muram_offset(mspi->tx_bd));
386 cpm_muram_free(cpm_muram_offset(mspi->pram));
387 fsl_spi_free_dummy_rx();
388}