blob: 14e202ee70363832f439b073fffd6ac4b36eaa3f [file] [log] [blame]
Kumar Galaccf06992006-05-20 15:00:15 -07001/*
Mingkai Hub36ece82010-10-12 18:18:31 +08002 * Freescale SPI controller driver.
Kumar Galaccf06992006-05-20 15:00:15 -07003 *
4 * Maintainer: Kumar Gala
5 *
6 * Copyright (C) 2006 Polycom, Inc.
Mingkai Hub36ece82010-10-12 18:18:31 +08007 * Copyright 2010 Freescale Semiconductor, Inc.
Kumar Galaccf06992006-05-20 15:00:15 -07008 *
Anton Vorontsov4c1fba42009-10-12 20:49:27 +04009 * CPM SPI and QE buffer descriptors mode support:
10 * Copyright (c) 2009 MontaVista Software, Inc.
11 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
12 *
Andreas Larsson447b0c72013-02-15 16:52:26 +010013 * GRLIB support:
14 * Copyright (c) 2012 Aeroflex Gaisler AB.
15 * Author: Andreas Larsson <andreas@gaisler.com>
16 *
Kumar Galaccf06992006-05-20 15:00:15 -070017 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the
19 * Free Software Foundation; either version 2 of the License, or (at your
20 * option) any later version.
21 */
22#include <linux/module.h>
Kumar Galaccf06992006-05-20 15:00:15 -070023#include <linux/types.h>
24#include <linux/kernel.h>
Kumar Galaccf06992006-05-20 15:00:15 -070025#include <linux/interrupt.h>
26#include <linux/delay.h>
27#include <linux/irq.h>
Kumar Galaccf06992006-05-20 15:00:15 -070028#include <linux/spi/spi.h>
29#include <linux/spi/spi_bitbang.h>
30#include <linux/platform_device.h>
31#include <linux/fsl_devices.h>
Anton Vorontsov4c1fba42009-10-12 20:49:27 +040032#include <linux/dma-mapping.h>
33#include <linux/mm.h>
34#include <linux/mutex.h>
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -070035#include <linux/of.h>
36#include <linux/of_platform.h>
Andreas Larssone8beacb2013-02-15 16:52:21 +010037#include <linux/of_address.h>
38#include <linux/of_irq.h>
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -070039#include <linux/gpio.h>
40#include <linux/of_gpio.h>
Kumar Galaccf06992006-05-20 15:00:15 -070041
Grant Likelyca632f52011-06-06 01:16:30 -060042#include "spi-fsl-lib.h"
Andreas Larssone8beacb2013-02-15 16:52:21 +010043#include "spi-fsl-cpm.h"
44#include "spi-fsl-spi.h"
Kumar Galaccf06992006-05-20 15:00:15 -070045
Andreas Larssonc3f3e772013-02-15 16:52:24 +010046#define TYPE_FSL 0
Andreas Larsson447b0c72013-02-15 16:52:26 +010047#define TYPE_GRLIB 1
Andreas Larssonc3f3e772013-02-15 16:52:24 +010048
49struct fsl_spi_match_data {
50 int type;
51};
52
53static struct fsl_spi_match_data of_fsl_spi_fsl_config = {
54 .type = TYPE_FSL,
55};
56
Andreas Larsson447b0c72013-02-15 16:52:26 +010057static struct fsl_spi_match_data of_fsl_spi_grlib_config = {
58 .type = TYPE_GRLIB,
59};
60
Andreas Larssonc3f3e772013-02-15 16:52:24 +010061static struct of_device_id of_fsl_spi_match[] = {
62 {
63 .compatible = "fsl,spi",
64 .data = &of_fsl_spi_fsl_config,
65 },
Andreas Larsson447b0c72013-02-15 16:52:26 +010066 {
67 .compatible = "aeroflexgaisler,spictrl",
68 .data = &of_fsl_spi_grlib_config,
69 },
Andreas Larssonc3f3e772013-02-15 16:52:24 +010070 {}
71};
72MODULE_DEVICE_TABLE(of, of_fsl_spi_match);
73
74static int fsl_spi_get_type(struct device *dev)
75{
76 const struct of_device_id *match;
77
78 if (dev->of_node) {
79 match = of_match_node(of_fsl_spi_match, dev->of_node);
80 if (match && match->data)
81 return ((struct fsl_spi_match_data *)match->data)->type;
82 }
83 return TYPE_FSL;
84}
85
Mingkai Hub36ece82010-10-12 18:18:31 +080086static void fsl_spi_change_mode(struct spi_device *spi)
Anton Vorontsova35c1712009-10-12 20:49:24 +040087{
88 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
89 struct spi_mpc8xxx_cs *cs = spi->controller_state;
Mingkai Hub36ece82010-10-12 18:18:31 +080090 struct fsl_spi_reg *reg_base = mspi->reg_base;
91 __be32 __iomem *mode = &reg_base->mode;
Anton Vorontsova35c1712009-10-12 20:49:24 +040092 unsigned long flags;
93
94 if (cs->hw_mode == mpc8xxx_spi_read_reg(mode))
95 return;
96
97 /* Turn off IRQs locally to minimize time that SPI is disabled. */
98 local_irq_save(flags);
99
100 /* Turn off SPI unit prior changing mode */
101 mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
Anton Vorontsova35c1712009-10-12 20:49:24 +0400102
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400103 /* When in CPM mode, we need to reinit tx and rx. */
104 if (mspi->flags & SPI_CPM_MODE) {
Andreas Larssone8beacb2013-02-15 16:52:21 +0100105 fsl_spi_cpm_reinit_txrx(mspi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400106 }
Joakim Tjernlundf9218c22010-05-22 02:18:02 -0600107 mpc8xxx_spi_write_reg(mode, cs->hw_mode);
Anton Vorontsova35c1712009-10-12 20:49:24 +0400108 local_irq_restore(flags);
109}
110
Mingkai Hub36ece82010-10-12 18:18:31 +0800111static void fsl_spi_chipselect(struct spi_device *spi, int value)
Kumar Galaccf06992006-05-20 15:00:15 -0700112{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700113 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
Kenth Eriksson5039a862012-03-30 17:05:30 +0200114 struct fsl_spi_platform_data *pdata;
Anton Vorontsov364fdbc2009-03-31 15:24:36 -0700115 bool pol = spi->mode & SPI_CS_HIGH;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700116 struct spi_mpc8xxx_cs *cs = spi->controller_state;
Kumar Galaccf06992006-05-20 15:00:15 -0700117
Kenth Eriksson5039a862012-03-30 17:05:30 +0200118 pdata = spi->dev.parent->parent->platform_data;
119
Kumar Galaccf06992006-05-20 15:00:15 -0700120 if (value == BITBANG_CS_INACTIVE) {
Anton Vorontsov364fdbc2009-03-31 15:24:36 -0700121 if (pdata->cs_control)
122 pdata->cs_control(spi, !pol);
Kumar Galaccf06992006-05-20 15:00:15 -0700123 }
124
125 if (value == BITBANG_CS_ACTIVE) {
Anton Vorontsov575c5802009-06-18 16:49:08 -0700126 mpc8xxx_spi->rx_shift = cs->rx_shift;
127 mpc8xxx_spi->tx_shift = cs->tx_shift;
128 mpc8xxx_spi->get_rx = cs->get_rx;
129 mpc8xxx_spi->get_tx = cs->get_tx;
Kumar Galaccf06992006-05-20 15:00:15 -0700130
Mingkai Hub36ece82010-10-12 18:18:31 +0800131 fsl_spi_change_mode(spi);
Kumar Galaccf06992006-05-20 15:00:15 -0700132
Anton Vorontsov364fdbc2009-03-31 15:24:36 -0700133 if (pdata->cs_control)
134 pdata->cs_control(spi, pol);
Kumar Galaccf06992006-05-20 15:00:15 -0700135 }
136}
137
Andreas Larssonb48c4e32013-02-15 16:52:23 +0100138static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift,
139 int bits_per_word, int msb_first)
140{
141 *rx_shift = 0;
142 *tx_shift = 0;
143 if (msb_first) {
144 if (bits_per_word <= 8) {
145 *rx_shift = 16;
146 *tx_shift = 24;
147 } else if (bits_per_word <= 16) {
148 *rx_shift = 16;
149 *tx_shift = 16;
150 }
151 } else {
152 if (bits_per_word <= 8)
153 *rx_shift = 8;
154 }
155}
156
Andreas Larsson447b0c72013-02-15 16:52:26 +0100157static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift,
158 int bits_per_word, int msb_first)
159{
160 *rx_shift = 0;
161 *tx_shift = 0;
162 if (bits_per_word <= 16) {
163 if (msb_first) {
164 *rx_shift = 16; /* LSB in bit 16 */
165 *tx_shift = 32 - bits_per_word; /* MSB in bit 31 */
166 } else {
167 *rx_shift = 16 - bits_per_word; /* MSB in bit 15 */
168 }
169 }
170}
171
Mingkai Hub36ece82010-10-12 18:18:31 +0800172static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
173 struct spi_device *spi,
174 struct mpc8xxx_spi *mpc8xxx_spi,
175 int bits_per_word)
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000176{
177 cs->rx_shift = 0;
178 cs->tx_shift = 0;
179 if (bits_per_word <= 8) {
180 cs->get_rx = mpc8xxx_spi_rx_buf_u8;
181 cs->get_tx = mpc8xxx_spi_tx_buf_u8;
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000182 } else if (bits_per_word <= 16) {
183 cs->get_rx = mpc8xxx_spi_rx_buf_u16;
184 cs->get_tx = mpc8xxx_spi_tx_buf_u16;
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000185 } else if (bits_per_word <= 32) {
186 cs->get_rx = mpc8xxx_spi_rx_buf_u32;
187 cs->get_tx = mpc8xxx_spi_tx_buf_u32;
188 } else
189 return -EINVAL;
190
Andreas Larssonb48c4e32013-02-15 16:52:23 +0100191 if (mpc8xxx_spi->set_shifts)
192 mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift,
193 bits_per_word,
194 !(spi->mode & SPI_LSB_FIRST));
195
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000196 mpc8xxx_spi->rx_shift = cs->rx_shift;
197 mpc8xxx_spi->tx_shift = cs->tx_shift;
198 mpc8xxx_spi->get_rx = cs->get_rx;
199 mpc8xxx_spi->get_tx = cs->get_tx;
200
201 return bits_per_word;
202}
203
Mingkai Hub36ece82010-10-12 18:18:31 +0800204static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
205 struct spi_device *spi,
206 int bits_per_word)
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000207{
208 /* QE uses Little Endian for words > 8
209 * so transform all words > 8 into 8 bits
210 * Unfortnatly that doesn't work for LSB so
211 * reject these for now */
212 /* Note: 32 bits word, LSB works iff
213 * tfcr/rfcr is set to CPMFCR_GBL */
214 if (spi->mode & SPI_LSB_FIRST &&
215 bits_per_word > 8)
216 return -EINVAL;
217 if (bits_per_word > 8)
218 return 8; /* pretend its 8 bits */
219 return bits_per_word;
220}
221
Mingkai Hub36ece82010-10-12 18:18:31 +0800222static int fsl_spi_setup_transfer(struct spi_device *spi,
223 struct spi_transfer *t)
Kumar Galaccf06992006-05-20 15:00:15 -0700224{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700225 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +0800226 int bits_per_word = 0;
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000227 u8 pm;
Mingkai Hub36ece82010-10-12 18:18:31 +0800228 u32 hz = 0;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700229 struct spi_mpc8xxx_cs *cs = spi->controller_state;
Kumar Galaccf06992006-05-20 15:00:15 -0700230
Anton Vorontsov575c5802009-06-18 16:49:08 -0700231 mpc8xxx_spi = spi_master_get_devdata(spi->master);
Kumar Galaccf06992006-05-20 15:00:15 -0700232
233 if (t) {
234 bits_per_word = t->bits_per_word;
235 hz = t->speed_hz;
Kumar Galaccf06992006-05-20 15:00:15 -0700236 }
237
238 /* spi_transfer level calls that work per-word */
239 if (!bits_per_word)
240 bits_per_word = spi->bits_per_word;
241
242 /* Make sure its a bit width we support [4..16, 32] */
243 if ((bits_per_word < 4)
Andreas Larsson8922a362013-02-15 16:52:25 +0100244 || ((bits_per_word > 16) && (bits_per_word != 32))
245 || (bits_per_word > mpc8xxx_spi->max_bits_per_word))
Kumar Galaccf06992006-05-20 15:00:15 -0700246 return -EINVAL;
247
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700248 if (!hz)
249 hz = spi->max_speed_hz;
250
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000251 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
252 bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
253 mpc8xxx_spi,
254 bits_per_word);
255 else if (mpc8xxx_spi->flags & SPI_QE)
256 bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
257 bits_per_word);
Kumar Galaccf06992006-05-20 15:00:15 -0700258
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000259 if (bits_per_word < 0)
260 return bits_per_word;
Kumar Galaccf06992006-05-20 15:00:15 -0700261
262 if (bits_per_word == 32)
263 bits_per_word = 0;
264 else
265 bits_per_word = bits_per_word - 1;
266
Anton Vorontsov32421da2007-07-31 00:38:41 -0700267 /* mask out bits we are going to set */
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700268 cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
269 | SPMODE_PM(0xF));
Kumar Galaccf06992006-05-20 15:00:15 -0700270
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700271 cs->hw_mode |= SPMODE_LEN(bits_per_word);
Kumar Galaccf06992006-05-20 15:00:15 -0700272
Anton Vorontsov575c5802009-06-18 16:49:08 -0700273 if ((mpc8xxx_spi->spibrg / hz) > 64) {
Peter Korsgaard53604db2008-09-13 02:33:14 -0700274 cs->hw_mode |= SPMODE_DIV16;
Ernst Schwab4f4517c2010-02-16 21:02:57 -0700275 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
Anton Vorontsovfd8a11e2009-06-18 16:49:01 -0700276
277 WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. "
278 "Will use %d Hz instead.\n", dev_name(&spi->dev),
Anton Vorontsov575c5802009-06-18 16:49:08 -0700279 hz, mpc8xxx_spi->spibrg / 1024);
Anton Vorontsovfd8a11e2009-06-18 16:49:01 -0700280 if (pm > 16)
Peter Korsgaard53604db2008-09-13 02:33:14 -0700281 pm = 16;
Mingkai Hub36ece82010-10-12 18:18:31 +0800282 } else {
Ernst Schwab4f4517c2010-02-16 21:02:57 -0700283 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
Mingkai Hub36ece82010-10-12 18:18:31 +0800284 }
Chen Gonga61f5342008-07-23 21:29:52 -0700285 if (pm)
286 pm--;
287
288 cs->hw_mode |= SPMODE_PM(pm);
David Brownelldccd5732007-07-17 04:04:02 -0700289
Mingkai Hub36ece82010-10-12 18:18:31 +0800290 fsl_spi_change_mode(spi);
Kumar Galaccf06992006-05-20 15:00:15 -0700291 return 0;
292}
293
Mingkai Hub36ece82010-10-12 18:18:31 +0800294static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400295 struct spi_transfer *t, unsigned int len)
296{
297 u32 word;
Mingkai Hub36ece82010-10-12 18:18:31 +0800298 struct fsl_spi_reg *reg_base = mspi->reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400299
300 mspi->count = len;
301
302 /* enable rx ints */
Mingkai Hub36ece82010-10-12 18:18:31 +0800303 mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400304
305 /* transmit word */
306 word = mspi->get_tx(mspi);
Mingkai Hub36ece82010-10-12 18:18:31 +0800307 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400308
309 return 0;
310}
311
Mingkai Hub36ece82010-10-12 18:18:31 +0800312static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400313 bool is_dma_mapped)
314{
315 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
Mingkai Hub36ece82010-10-12 18:18:31 +0800316 struct fsl_spi_reg *reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400317 unsigned int len = t->len;
318 u8 bits_per_word;
319 int ret;
320
Mingkai Hub36ece82010-10-12 18:18:31 +0800321 reg_base = mpc8xxx_spi->reg_base;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700322 bits_per_word = spi->bits_per_word;
323 if (t->bits_per_word)
324 bits_per_word = t->bits_per_word;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400325
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700326 if (bits_per_word > 8) {
327 /* invalid length? */
328 if (len & 1)
329 return -EINVAL;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700330 len /= 2;
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700331 }
332 if (bits_per_word > 16) {
333 /* invalid length? */
334 if (len & 1)
335 return -EINVAL;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700336 len /= 2;
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700337 }
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400338
339 mpc8xxx_spi->tx = t->tx_buf;
340 mpc8xxx_spi->rx = t->rx_buf;
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700341
Anton Vorontsov575c5802009-06-18 16:49:08 -0700342 INIT_COMPLETION(mpc8xxx_spi->done);
Kumar Galaccf06992006-05-20 15:00:15 -0700343
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400344 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800345 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400346 else
Mingkai Hub36ece82010-10-12 18:18:31 +0800347 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400348 if (ret)
349 return ret;
Kumar Galaccf06992006-05-20 15:00:15 -0700350
Anton Vorontsov575c5802009-06-18 16:49:08 -0700351 wait_for_completion(&mpc8xxx_spi->done);
Kumar Galaccf06992006-05-20 15:00:15 -0700352
353 /* disable rx ints */
Mingkai Hub36ece82010-10-12 18:18:31 +0800354 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
Kumar Galaccf06992006-05-20 15:00:15 -0700355
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400356 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800357 fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400358
Anton Vorontsov575c5802009-06-18 16:49:08 -0700359 return mpc8xxx_spi->count;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700360}
361
Mingkai Hub36ece82010-10-12 18:18:31 +0800362static void fsl_spi_do_one_msg(struct spi_message *m)
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700363{
364 struct spi_device *spi = m->spi;
365 struct spi_transfer *t;
366 unsigned int cs_change;
367 const int nsecs = 50;
368 int status;
369
370 cs_change = 1;
371 status = 0;
372 list_for_each_entry(t, &m->transfers, transfer_list) {
373 if (t->bits_per_word || t->speed_hz) {
374 /* Don't allow changes if CS is active */
375 status = -EINVAL;
376
377 if (cs_change)
Mingkai Hub36ece82010-10-12 18:18:31 +0800378 status = fsl_spi_setup_transfer(spi, t);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700379 if (status < 0)
380 break;
381 }
382
383 if (cs_change) {
Mingkai Hub36ece82010-10-12 18:18:31 +0800384 fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700385 ndelay(nsecs);
386 }
387 cs_change = t->cs_change;
388 if (t->len)
Mingkai Hub36ece82010-10-12 18:18:31 +0800389 status = fsl_spi_bufs(spi, t, m->is_dma_mapped);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700390 if (status) {
391 status = -EMSGSIZE;
392 break;
393 }
394 m->actual_length += t->len;
395
396 if (t->delay_usecs)
397 udelay(t->delay_usecs);
398
399 if (cs_change) {
400 ndelay(nsecs);
Mingkai Hub36ece82010-10-12 18:18:31 +0800401 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700402 ndelay(nsecs);
403 }
404 }
405
406 m->status = status;
407 m->complete(m->context);
408
409 if (status || !cs_change) {
410 ndelay(nsecs);
Mingkai Hub36ece82010-10-12 18:18:31 +0800411 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700412 }
413
Mingkai Hub36ece82010-10-12 18:18:31 +0800414 fsl_spi_setup_transfer(spi, NULL);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700415}
416
Mingkai Hub36ece82010-10-12 18:18:31 +0800417static int fsl_spi_setup(struct spi_device *spi)
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700418{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700419 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +0800420 struct fsl_spi_reg *reg_base;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700421 int retval;
422 u32 hw_mode;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700423 struct spi_mpc8xxx_cs *cs = spi->controller_state;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700424
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700425 if (!spi->max_speed_hz)
426 return -EINVAL;
427
428 if (!cs) {
429 cs = kzalloc(sizeof *cs, GFP_KERNEL);
430 if (!cs)
431 return -ENOMEM;
432 spi->controller_state = cs;
433 }
Anton Vorontsov575c5802009-06-18 16:49:08 -0700434 mpc8xxx_spi = spi_master_get_devdata(spi->master);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700435
Mingkai Hub36ece82010-10-12 18:18:31 +0800436 reg_base = mpc8xxx_spi->reg_base;
437
Thomas Weber88393162010-03-16 11:47:56 +0100438 hw_mode = cs->hw_mode; /* Save original settings */
Mingkai Hub36ece82010-10-12 18:18:31 +0800439 cs->hw_mode = mpc8xxx_spi_read_reg(&reg_base->mode);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700440 /* mask out bits we are going to set */
441 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
442 | SPMODE_REV | SPMODE_LOOP);
443
444 if (spi->mode & SPI_CPHA)
445 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
446 if (spi->mode & SPI_CPOL)
447 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
448 if (!(spi->mode & SPI_LSB_FIRST))
449 cs->hw_mode |= SPMODE_REV;
450 if (spi->mode & SPI_LOOP)
451 cs->hw_mode |= SPMODE_LOOP;
452
Mingkai Hub36ece82010-10-12 18:18:31 +0800453 retval = fsl_spi_setup_transfer(spi, NULL);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700454 if (retval < 0) {
455 cs->hw_mode = hw_mode; /* Restore settings */
456 return retval;
457 }
Andreas Larssonf482cd02013-02-15 16:52:22 +0100458
Andreas Larsson76a74982013-02-15 16:52:27 +0100459 if (mpc8xxx_spi->type == TYPE_GRLIB) {
460 if (gpio_is_valid(spi->cs_gpio)) {
461 int desel;
462
463 retval = gpio_request(spi->cs_gpio,
464 dev_name(&spi->dev));
465 if (retval)
466 return retval;
467
468 desel = !(spi->mode & SPI_CS_HIGH);
469 retval = gpio_direction_output(spi->cs_gpio, desel);
470 if (retval) {
471 gpio_free(spi->cs_gpio);
472 return retval;
473 }
474 } else if (spi->cs_gpio != -ENOENT) {
475 if (spi->cs_gpio < 0)
476 return spi->cs_gpio;
477 return -EINVAL;
478 }
479 /* When spi->cs_gpio == -ENOENT, a hole in the phandle list
480 * indicates to use native chipselect if present, or allow for
481 * an always selected chip
482 */
483 }
484
Andreas Larssonf482cd02013-02-15 16:52:22 +0100485 /* Initialize chipselect - might be active for SPI_CS_HIGH mode */
486 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
487
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700488 return 0;
Kumar Galaccf06992006-05-20 15:00:15 -0700489}
490
Andreas Larsson76a74982013-02-15 16:52:27 +0100491static void fsl_spi_cleanup(struct spi_device *spi)
492{
493 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
494
495 if (mpc8xxx_spi->type == TYPE_GRLIB && gpio_is_valid(spi->cs_gpio))
496 gpio_free(spi->cs_gpio);
497}
498
Mingkai Hub36ece82010-10-12 18:18:31 +0800499static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400500{
Mingkai Hub36ece82010-10-12 18:18:31 +0800501 struct fsl_spi_reg *reg_base = mspi->reg_base;
502
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400503 /* We need handle RX first */
504 if (events & SPIE_NE) {
Mingkai Hub36ece82010-10-12 18:18:31 +0800505 u32 rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400506
507 if (mspi->rx)
508 mspi->get_rx(rx_data, mspi);
509 }
510
511 if ((events & SPIE_NF) == 0)
512 /* spin until TX is done */
513 while (((events =
Mingkai Hub36ece82010-10-12 18:18:31 +0800514 mpc8xxx_spi_read_reg(&reg_base->event)) &
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400515 SPIE_NF) == 0)
516 cpu_relax();
517
518 /* Clear the events */
Mingkai Hub36ece82010-10-12 18:18:31 +0800519 mpc8xxx_spi_write_reg(&reg_base->event, events);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400520
521 mspi->count -= 1;
522 if (mspi->count) {
523 u32 word = mspi->get_tx(mspi);
524
Mingkai Hub36ece82010-10-12 18:18:31 +0800525 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400526 } else {
527 complete(&mspi->done);
528 }
529}
530
Mingkai Hub36ece82010-10-12 18:18:31 +0800531static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400532{
533 struct mpc8xxx_spi *mspi = context_data;
534 irqreturn_t ret = IRQ_NONE;
535 u32 events;
Mingkai Hub36ece82010-10-12 18:18:31 +0800536 struct fsl_spi_reg *reg_base = mspi->reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400537
538 /* Get interrupt events(tx/rx) */
Mingkai Hub36ece82010-10-12 18:18:31 +0800539 events = mpc8xxx_spi_read_reg(&reg_base->event);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400540 if (events)
541 ret = IRQ_HANDLED;
542
543 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
544
545 if (mspi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800546 fsl_spi_cpm_irq(mspi, events);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400547 else
Mingkai Hub36ece82010-10-12 18:18:31 +0800548 fsl_spi_cpu_irq(mspi, events);
Kumar Galaccf06992006-05-20 15:00:15 -0700549
550 return ret;
551}
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400552
Mingkai Hub36ece82010-10-12 18:18:31 +0800553static void fsl_spi_remove(struct mpc8xxx_spi *mspi)
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400554{
Mingkai Hub36ece82010-10-12 18:18:31 +0800555 iounmap(mspi->reg_base);
556 fsl_spi_cpm_free(mspi);
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400557}
558
Andreas Larsson447b0c72013-02-15 16:52:26 +0100559static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on)
560{
561 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
562 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base;
563 u32 slvsel;
564 u16 cs = spi->chip_select;
565
Andreas Larsson76a74982013-02-15 16:52:27 +0100566 if (gpio_is_valid(spi->cs_gpio)) {
567 gpio_set_value(spi->cs_gpio, on);
568 } else if (cs < mpc8xxx_spi->native_chipselects) {
569 slvsel = mpc8xxx_spi_read_reg(&reg_base->slvsel);
570 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs));
571 mpc8xxx_spi_write_reg(&reg_base->slvsel, slvsel);
572 }
Andreas Larsson447b0c72013-02-15 16:52:26 +0100573}
574
575static void fsl_spi_grlib_probe(struct device *dev)
576{
577 struct fsl_spi_platform_data *pdata = dev->platform_data;
578 struct spi_master *master = dev_get_drvdata(dev);
579 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
580 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base;
581 int mbits;
582 u32 capabilities;
583
584 capabilities = mpc8xxx_spi_read_reg(&reg_base->cap);
585
586 mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts;
587 mbits = SPCAP_MAXWLEN(capabilities);
588 if (mbits)
589 mpc8xxx_spi->max_bits_per_word = mbits + 1;
590
Andreas Larsson76a74982013-02-15 16:52:27 +0100591 mpc8xxx_spi->native_chipselects = 0;
Andreas Larsson447b0c72013-02-15 16:52:26 +0100592 if (SPCAP_SSEN(capabilities)) {
Andreas Larsson76a74982013-02-15 16:52:27 +0100593 mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities);
Andreas Larsson447b0c72013-02-15 16:52:26 +0100594 mpc8xxx_spi_write_reg(&reg_base->slvsel, 0xffffffff);
595 }
Andreas Larsson76a74982013-02-15 16:52:27 +0100596 master->num_chipselect = mpc8xxx_spi->native_chipselects;
Andreas Larsson447b0c72013-02-15 16:52:26 +0100597 pdata->cs_control = fsl_spi_grlib_cs_control;
598}
599
Grant Likelyfd4a3192012-12-07 16:57:14 +0000600static struct spi_master * fsl_spi_probe(struct device *dev,
Mingkai Hub36ece82010-10-12 18:18:31 +0800601 struct resource *mem, unsigned int irq)
Kumar Galaccf06992006-05-20 15:00:15 -0700602{
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700603 struct fsl_spi_platform_data *pdata = dev->platform_data;
Kumar Galaccf06992006-05-20 15:00:15 -0700604 struct spi_master *master;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700605 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +0800606 struct fsl_spi_reg *reg_base;
Kumar Galaccf06992006-05-20 15:00:15 -0700607 u32 regval;
608 int ret = 0;
609
Anton Vorontsov575c5802009-06-18 16:49:08 -0700610 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
Kumar Galaccf06992006-05-20 15:00:15 -0700611 if (master == NULL) {
612 ret = -ENOMEM;
613 goto err;
614 }
615
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700616 dev_set_drvdata(dev, master);
Kumar Galaccf06992006-05-20 15:00:15 -0700617
Mingkai Hub36ece82010-10-12 18:18:31 +0800618 ret = mpc8xxx_spi_probe(dev, mem, irq);
619 if (ret)
620 goto err_probe;
David Brownelle7db06b2009-06-17 16:26:04 -0700621
Mingkai Hub36ece82010-10-12 18:18:31 +0800622 master->setup = fsl_spi_setup;
Andreas Larsson76a74982013-02-15 16:52:27 +0100623 master->cleanup = fsl_spi_cleanup;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700624
Anton Vorontsov575c5802009-06-18 16:49:08 -0700625 mpc8xxx_spi = spi_master_get_devdata(master);
Mingkai Hub36ece82010-10-12 18:18:31 +0800626 mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
627 mpc8xxx_spi->spi_remove = fsl_spi_remove;
Andreas Larsson8922a362013-02-15 16:52:25 +0100628 mpc8xxx_spi->max_bits_per_word = 32;
Andreas Larssonc3f3e772013-02-15 16:52:24 +0100629 mpc8xxx_spi->type = fsl_spi_get_type(dev);
Mingkai Hub36ece82010-10-12 18:18:31 +0800630
631 ret = fsl_spi_cpm_init(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400632 if (ret)
633 goto err_cpm_init;
634
Andreas Larsson447b0c72013-02-15 16:52:26 +0100635 mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
636 if (mpc8xxx_spi->reg_base == NULL) {
637 ret = -ENOMEM;
638 goto err_ioremap;
639 }
640
641 if (mpc8xxx_spi->type == TYPE_GRLIB)
642 fsl_spi_grlib_probe(dev);
643
Andreas Larssonb48c4e32013-02-15 16:52:23 +0100644 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
645 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;
646
647 if (mpc8xxx_spi->set_shifts)
648 /* 8 bits per word and MSB first */
649 mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift,
650 &mpc8xxx_spi->tx_shift, 8, 1);
Joakim Tjernlundf29ba282007-07-17 04:04:12 -0700651
Kumar Galaccf06992006-05-20 15:00:15 -0700652 /* Register for SPI Interrupt */
Mingkai Hub36ece82010-10-12 18:18:31 +0800653 ret = request_irq(mpc8xxx_spi->irq, fsl_spi_irq,
654 0, "fsl_spi", mpc8xxx_spi);
Kumar Galaccf06992006-05-20 15:00:15 -0700655
656 if (ret != 0)
Mingkai Hub36ece82010-10-12 18:18:31 +0800657 goto free_irq;
Kumar Galaccf06992006-05-20 15:00:15 -0700658
Mingkai Hub36ece82010-10-12 18:18:31 +0800659 reg_base = mpc8xxx_spi->reg_base;
Kumar Galaccf06992006-05-20 15:00:15 -0700660
661 /* SPI controller initializations */
Mingkai Hub36ece82010-10-12 18:18:31 +0800662 mpc8xxx_spi_write_reg(&reg_base->mode, 0);
663 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
664 mpc8xxx_spi_write_reg(&reg_base->command, 0);
665 mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
Kumar Galaccf06992006-05-20 15:00:15 -0700666
667 /* Enable SPI interface */
668 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
Andreas Larsson8922a362013-02-15 16:52:25 +0100669 if (mpc8xxx_spi->max_bits_per_word < 8) {
670 regval &= ~SPMODE_LEN(0xF);
671 regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
672 }
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400673 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
Joakim Tjernlundf29ba282007-07-17 04:04:12 -0700674 regval |= SPMODE_OP;
675
Mingkai Hub36ece82010-10-12 18:18:31 +0800676 mpc8xxx_spi_write_reg(&reg_base->mode, regval);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700677
678 ret = spi_register_master(master);
679 if (ret < 0)
680 goto unreg_master;
Kumar Galaccf06992006-05-20 15:00:15 -0700681
Mingkai Hub36ece82010-10-12 18:18:31 +0800682 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400683 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
Kumar Galaccf06992006-05-20 15:00:15 -0700684
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700685 return master;
Kumar Galaccf06992006-05-20 15:00:15 -0700686
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700687unreg_master:
Anton Vorontsov575c5802009-06-18 16:49:08 -0700688 free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
Mingkai Hub36ece82010-10-12 18:18:31 +0800689free_irq:
690 iounmap(mpc8xxx_spi->reg_base);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400691err_ioremap:
Mingkai Hub36ece82010-10-12 18:18:31 +0800692 fsl_spi_cpm_free(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400693err_cpm_init:
Mingkai Hub36ece82010-10-12 18:18:31 +0800694err_probe:
Kumar Galaccf06992006-05-20 15:00:15 -0700695 spi_master_put(master);
Kumar Galaccf06992006-05-20 15:00:15 -0700696err:
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700697 return ERR_PTR(ret);
Kumar Galaccf06992006-05-20 15:00:15 -0700698}
699
Mingkai Hub36ece82010-10-12 18:18:31 +0800700static void fsl_spi_cs_control(struct spi_device *spi, bool on)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700701{
Herton Ronaldo Krzesinski067aa482012-05-11 15:29:50 -0700702 struct device *dev = spi->dev.parent->parent;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700703 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700704 u16 cs = spi->chip_select;
705 int gpio = pinfo->gpios[cs];
706 bool alow = pinfo->alow_flags[cs];
707
708 gpio_set_value(gpio, on ^ alow);
709}
710
Mingkai Hub36ece82010-10-12 18:18:31 +0800711static int of_fsl_spi_get_chipselects(struct device *dev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700712{
Grant Likely61c7a082010-04-13 16:12:29 -0700713 struct device_node *np = dev->of_node;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700714 struct fsl_spi_platform_data *pdata = dev->platform_data;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700715 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
Grant Likelye80beb22013-02-12 17:48:37 +0000716 int ngpios;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700717 int i = 0;
718 int ret;
719
720 ngpios = of_gpio_count(np);
Grant Likelye80beb22013-02-12 17:48:37 +0000721 if (ngpios <= 0) {
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700722 /*
723 * SPI w/o chip-select line. One SPI device is still permitted
724 * though.
725 */
726 pdata->max_chipselect = 1;
727 return 0;
728 }
729
Roel Kluin02141542009-06-16 15:31:15 -0700730 pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700731 if (!pinfo->gpios)
732 return -ENOMEM;
Roel Kluin02141542009-06-16 15:31:15 -0700733 memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios));
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700734
Roel Kluin02141542009-06-16 15:31:15 -0700735 pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags),
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700736 GFP_KERNEL);
737 if (!pinfo->alow_flags) {
738 ret = -ENOMEM;
739 goto err_alloc_flags;
740 }
741
742 for (; i < ngpios; i++) {
743 int gpio;
744 enum of_gpio_flags flags;
745
746 gpio = of_get_gpio_flags(np, i, &flags);
747 if (!gpio_is_valid(gpio)) {
748 dev_err(dev, "invalid gpio #%d: %d\n", i, gpio);
Anton Vorontsov783058f2009-10-12 20:49:22 +0400749 ret = gpio;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700750 goto err_loop;
751 }
752
753 ret = gpio_request(gpio, dev_name(dev));
754 if (ret) {
755 dev_err(dev, "can't request gpio #%d: %d\n", i, ret);
756 goto err_loop;
757 }
758
759 pinfo->gpios[i] = gpio;
760 pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW;
761
762 ret = gpio_direction_output(pinfo->gpios[i],
763 pinfo->alow_flags[i]);
764 if (ret) {
765 dev_err(dev, "can't set output direction for gpio "
766 "#%d: %d\n", i, ret);
767 goto err_loop;
768 }
769 }
770
771 pdata->max_chipselect = ngpios;
Mingkai Hub36ece82010-10-12 18:18:31 +0800772 pdata->cs_control = fsl_spi_cs_control;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700773
774 return 0;
775
776err_loop:
777 while (i >= 0) {
778 if (gpio_is_valid(pinfo->gpios[i]))
779 gpio_free(pinfo->gpios[i]);
780 i--;
781 }
782
783 kfree(pinfo->alow_flags);
784 pinfo->alow_flags = NULL;
785err_alloc_flags:
786 kfree(pinfo->gpios);
787 pinfo->gpios = NULL;
788 return ret;
789}
790
Mingkai Hub36ece82010-10-12 18:18:31 +0800791static int of_fsl_spi_free_chipselects(struct device *dev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700792{
793 struct fsl_spi_platform_data *pdata = dev->platform_data;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700794 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700795 int i;
796
797 if (!pinfo->gpios)
798 return 0;
799
800 for (i = 0; i < pdata->max_chipselect; i++) {
801 if (gpio_is_valid(pinfo->gpios[i]))
802 gpio_free(pinfo->gpios[i]);
803 }
804
805 kfree(pinfo->gpios);
806 kfree(pinfo->alow_flags);
807 return 0;
808}
809
Grant Likelyfd4a3192012-12-07 16:57:14 +0000810static int of_fsl_spi_probe(struct platform_device *ofdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700811{
812 struct device *dev = &ofdev->dev;
Grant Likely61c7a082010-04-13 16:12:29 -0700813 struct device_node *np = ofdev->dev.of_node;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700814 struct spi_master *master;
815 struct resource mem;
Andreas Larsson447b0c72013-02-15 16:52:26 +0100816 int irq, type;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700817 int ret = -ENOMEM;
818
Grant Likely18d306d2011-02-22 21:02:43 -0700819 ret = of_mpc8xxx_spi_probe(ofdev);
Mingkai Hub36ece82010-10-12 18:18:31 +0800820 if (ret)
821 return ret;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700822
Andreas Larsson447b0c72013-02-15 16:52:26 +0100823 type = fsl_spi_get_type(&ofdev->dev);
824 if (type == TYPE_FSL) {
825 ret = of_fsl_spi_get_chipselects(dev);
826 if (ret)
827 goto err;
828 }
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700829
830 ret = of_address_to_resource(np, 0, &mem);
831 if (ret)
832 goto err;
833
Andreas Larssone8beacb2013-02-15 16:52:21 +0100834 irq = irq_of_parse_and_map(np, 0);
835 if (!irq) {
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700836 ret = -EINVAL;
837 goto err;
838 }
839
Andreas Larssone8beacb2013-02-15 16:52:21 +0100840 master = fsl_spi_probe(dev, &mem, irq);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700841 if (IS_ERR(master)) {
842 ret = PTR_ERR(master);
843 goto err;
844 }
845
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700846 return 0;
847
848err:
Andreas Larsson447b0c72013-02-15 16:52:26 +0100849 if (type == TYPE_FSL)
850 of_fsl_spi_free_chipselects(dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700851 return ret;
852}
853
Grant Likelyfd4a3192012-12-07 16:57:14 +0000854static int of_fsl_spi_remove(struct platform_device *ofdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700855{
Andreas Larsson447b0c72013-02-15 16:52:26 +0100856 struct spi_master *master = dev_get_drvdata(&ofdev->dev);
857 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700858 int ret;
859
Anton Vorontsov575c5802009-06-18 16:49:08 -0700860 ret = mpc8xxx_spi_remove(&ofdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700861 if (ret)
862 return ret;
Andreas Larsson447b0c72013-02-15 16:52:26 +0100863 if (mpc8xxx_spi->type == TYPE_FSL)
864 of_fsl_spi_free_chipselects(&ofdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700865 return 0;
866}
867
Grant Likely18d306d2011-02-22 21:02:43 -0700868static struct platform_driver of_fsl_spi_driver = {
Grant Likely40182942010-04-13 16:13:02 -0700869 .driver = {
Mingkai Hub36ece82010-10-12 18:18:31 +0800870 .name = "fsl_spi",
Grant Likely40182942010-04-13 16:13:02 -0700871 .owner = THIS_MODULE,
Mingkai Hub36ece82010-10-12 18:18:31 +0800872 .of_match_table = of_fsl_spi_match,
Grant Likely40182942010-04-13 16:13:02 -0700873 },
Mingkai Hub36ece82010-10-12 18:18:31 +0800874 .probe = of_fsl_spi_probe,
Grant Likelyfd4a3192012-12-07 16:57:14 +0000875 .remove = of_fsl_spi_remove,
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700876};
877
878#ifdef CONFIG_MPC832x_RDB
879/*
Mingkai Hub36ece82010-10-12 18:18:31 +0800880 * XXX XXX XXX
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700881 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
882 * only. The driver should go away soon, since newer MPC8323E-RDB's device
883 * tree can work with OpenFirmware driver. But for now we support old trees
884 * as well.
885 */
Grant Likelyfd4a3192012-12-07 16:57:14 +0000886static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700887{
888 struct resource *mem;
Uwe Kleine-Könige9a172f2010-01-20 13:49:44 -0700889 int irq;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700890 struct spi_master *master;
891
892 if (!pdev->dev.platform_data)
893 return -EINVAL;
894
895 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
896 if (!mem)
897 return -EINVAL;
898
899 irq = platform_get_irq(pdev, 0);
Uwe Kleine-Könige9a172f2010-01-20 13:49:44 -0700900 if (irq <= 0)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700901 return -EINVAL;
902
Mingkai Hub36ece82010-10-12 18:18:31 +0800903 master = fsl_spi_probe(&pdev->dev, mem, irq);
Alexandru Gheorghiue4d43782013-03-14 11:07:31 +0200904 return PTR_RET(master);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700905}
906
Grant Likelyfd4a3192012-12-07 16:57:14 +0000907static int plat_mpc8xxx_spi_remove(struct platform_device *pdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700908{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700909 return mpc8xxx_spi_remove(&pdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700910}
911
Anton Vorontsov575c5802009-06-18 16:49:08 -0700912MODULE_ALIAS("platform:mpc8xxx_spi");
913static struct platform_driver mpc8xxx_spi_driver = {
914 .probe = plat_mpc8xxx_spi_probe,
Grant Likelyfd4a3192012-12-07 16:57:14 +0000915 .remove = plat_mpc8xxx_spi_remove,
Kumar Galaccf06992006-05-20 15:00:15 -0700916 .driver = {
Anton Vorontsov575c5802009-06-18 16:49:08 -0700917 .name = "mpc8xxx_spi",
Kay Sievers7e38c3c2008-04-10 21:29:20 -0700918 .owner = THIS_MODULE,
Kumar Galaccf06992006-05-20 15:00:15 -0700919 },
920};
921
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700922static bool legacy_driver_failed;
923
924static void __init legacy_driver_register(void)
925{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700926 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700927}
928
929static void __exit legacy_driver_unregister(void)
930{
931 if (legacy_driver_failed)
932 return;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700933 platform_driver_unregister(&mpc8xxx_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700934}
935#else
936static void __init legacy_driver_register(void) {}
937static void __exit legacy_driver_unregister(void) {}
938#endif /* CONFIG_MPC832x_RDB */
939
Mingkai Hub36ece82010-10-12 18:18:31 +0800940static int __init fsl_spi_init(void)
Kumar Galaccf06992006-05-20 15:00:15 -0700941{
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700942 legacy_driver_register();
Grant Likely18d306d2011-02-22 21:02:43 -0700943 return platform_driver_register(&of_fsl_spi_driver);
Kumar Galaccf06992006-05-20 15:00:15 -0700944}
Mingkai Hub36ece82010-10-12 18:18:31 +0800945module_init(fsl_spi_init);
Kumar Galaccf06992006-05-20 15:00:15 -0700946
Mingkai Hub36ece82010-10-12 18:18:31 +0800947static void __exit fsl_spi_exit(void)
Kumar Galaccf06992006-05-20 15:00:15 -0700948{
Grant Likely18d306d2011-02-22 21:02:43 -0700949 platform_driver_unregister(&of_fsl_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700950 legacy_driver_unregister();
Kumar Galaccf06992006-05-20 15:00:15 -0700951}
Mingkai Hub36ece82010-10-12 18:18:31 +0800952module_exit(fsl_spi_exit);
Kumar Galaccf06992006-05-20 15:00:15 -0700953
954MODULE_AUTHOR("Kumar Gala");
Mingkai Hub36ece82010-10-12 18:18:31 +0800955MODULE_DESCRIPTION("Simple Freescale SPI Driver");
Kumar Galaccf06992006-05-20 15:00:15 -0700956MODULE_LICENSE("GPL");