blob: 60c590790854242dde41e86135192ca2c1cbb4a9 [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 */
Kumar Galaccf06992006-05-20 15:00:15 -070022#include <linux/delay.h>
Anton Vorontsov4c1fba42009-10-12 20:49:27 +040023#include <linux/dma-mapping.h>
Xiubo Lia3108362014-09-29 10:57:06 +080024#include <linux/fsl_devices.h>
25#include <linux/gpio.h>
26#include <linux/interrupt.h>
27#include <linux/irq.h>
28#include <linux/kernel.h>
Anton Vorontsov4c1fba42009-10-12 20:49:27 +040029#include <linux/mm.h>
Xiubo Lia3108362014-09-29 10:57:06 +080030#include <linux/module.h>
Anton Vorontsov4c1fba42009-10-12 20:49:27 +040031#include <linux/mutex.h>
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -070032#include <linux/of.h>
Andreas Larssone8beacb2013-02-15 16:52:21 +010033#include <linux/of_address.h>
34#include <linux/of_irq.h>
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -070035#include <linux/of_gpio.h>
Xiubo Lia3108362014-09-29 10:57:06 +080036#include <linux/of_platform.h>
37#include <linux/platform_device.h>
38#include <linux/spi/spi.h>
39#include <linux/spi/spi_bitbang.h>
40#include <linux/types.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
Jingoo Han3aea9012014-06-03 21:03:59 +090061static const struct of_device_id of_fsl_spi_match[] = {
Andreas Larssonc3f3e772013-02-15 16:52:24 +010062 {
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
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700242 if (!hz)
243 hz = spi->max_speed_hz;
244
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000245 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
246 bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
247 mpc8xxx_spi,
248 bits_per_word);
249 else if (mpc8xxx_spi->flags & SPI_QE)
250 bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
251 bits_per_word);
Kumar Galaccf06992006-05-20 15:00:15 -0700252
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000253 if (bits_per_word < 0)
254 return bits_per_word;
Kumar Galaccf06992006-05-20 15:00:15 -0700255
256 if (bits_per_word == 32)
257 bits_per_word = 0;
258 else
259 bits_per_word = bits_per_word - 1;
260
Anton Vorontsov32421da2007-07-31 00:38:41 -0700261 /* mask out bits we are going to set */
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700262 cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
263 | SPMODE_PM(0xF));
Kumar Galaccf06992006-05-20 15:00:15 -0700264
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700265 cs->hw_mode |= SPMODE_LEN(bits_per_word);
Kumar Galaccf06992006-05-20 15:00:15 -0700266
Anton Vorontsov575c5802009-06-18 16:49:08 -0700267 if ((mpc8xxx_spi->spibrg / hz) > 64) {
Peter Korsgaard53604db2008-09-13 02:33:14 -0700268 cs->hw_mode |= SPMODE_DIV16;
Ernst Schwab4f4517c2010-02-16 21:02:57 -0700269 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
Anton Vorontsovfd8a11e2009-06-18 16:49:01 -0700270
271 WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. "
272 "Will use %d Hz instead.\n", dev_name(&spi->dev),
Anton Vorontsov575c5802009-06-18 16:49:08 -0700273 hz, mpc8xxx_spi->spibrg / 1024);
Anton Vorontsovfd8a11e2009-06-18 16:49:01 -0700274 if (pm > 16)
Peter Korsgaard53604db2008-09-13 02:33:14 -0700275 pm = 16;
Mingkai Hub36ece82010-10-12 18:18:31 +0800276 } else {
Ernst Schwab4f4517c2010-02-16 21:02:57 -0700277 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
Mingkai Hub36ece82010-10-12 18:18:31 +0800278 }
Chen Gonga61f5342008-07-23 21:29:52 -0700279 if (pm)
280 pm--;
281
282 cs->hw_mode |= SPMODE_PM(pm);
David Brownelldccd5732007-07-17 04:04:02 -0700283
Mingkai Hub36ece82010-10-12 18:18:31 +0800284 fsl_spi_change_mode(spi);
Kumar Galaccf06992006-05-20 15:00:15 -0700285 return 0;
286}
287
Mingkai Hub36ece82010-10-12 18:18:31 +0800288static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400289 struct spi_transfer *t, unsigned int len)
290{
291 u32 word;
Mingkai Hub36ece82010-10-12 18:18:31 +0800292 struct fsl_spi_reg *reg_base = mspi->reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400293
294 mspi->count = len;
295
296 /* enable rx ints */
Mingkai Hub36ece82010-10-12 18:18:31 +0800297 mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400298
299 /* transmit word */
300 word = mspi->get_tx(mspi);
Mingkai Hub36ece82010-10-12 18:18:31 +0800301 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400302
303 return 0;
304}
305
Mingkai Hub36ece82010-10-12 18:18:31 +0800306static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400307 bool is_dma_mapped)
308{
309 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
Mingkai Hub36ece82010-10-12 18:18:31 +0800310 struct fsl_spi_reg *reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400311 unsigned int len = t->len;
312 u8 bits_per_word;
313 int ret;
314
Mingkai Hub36ece82010-10-12 18:18:31 +0800315 reg_base = mpc8xxx_spi->reg_base;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700316 bits_per_word = spi->bits_per_word;
317 if (t->bits_per_word)
318 bits_per_word = t->bits_per_word;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400319
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700320 if (bits_per_word > 8) {
321 /* invalid length? */
322 if (len & 1)
323 return -EINVAL;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700324 len /= 2;
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700325 }
326 if (bits_per_word > 16) {
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 }
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400332
333 mpc8xxx_spi->tx = t->tx_buf;
334 mpc8xxx_spi->rx = t->rx_buf;
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700335
Wolfram Sang16735d02013-11-14 14:32:02 -0800336 reinit_completion(&mpc8xxx_spi->done);
Kumar Galaccf06992006-05-20 15:00:15 -0700337
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400338 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800339 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400340 else
Mingkai Hub36ece82010-10-12 18:18:31 +0800341 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400342 if (ret)
343 return ret;
Kumar Galaccf06992006-05-20 15:00:15 -0700344
Anton Vorontsov575c5802009-06-18 16:49:08 -0700345 wait_for_completion(&mpc8xxx_spi->done);
Kumar Galaccf06992006-05-20 15:00:15 -0700346
347 /* disable rx ints */
Mingkai Hub36ece82010-10-12 18:18:31 +0800348 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
Kumar Galaccf06992006-05-20 15:00:15 -0700349
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400350 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800351 fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400352
Anton Vorontsov575c5802009-06-18 16:49:08 -0700353 return mpc8xxx_spi->count;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700354}
355
Heiner Kallweitc592bec2014-12-03 07:56:17 +0100356static int fsl_spi_do_one_msg(struct spi_master *master,
357 struct spi_message *m)
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700358{
359 struct spi_device *spi = m->spi;
Stefan Roese4302a5962014-01-31 13:44:59 +0100360 struct spi_transfer *t, *first;
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700361 unsigned int cs_change;
362 const int nsecs = 50;
363 int status;
364
Stefan Roese4302a5962014-01-31 13:44:59 +0100365 /* Don't allow changes if CS is active */
366 first = list_first_entry(&m->transfers, struct spi_transfer,
367 transfer_list);
368 list_for_each_entry(t, &m->transfers, transfer_list) {
369 if ((first->bits_per_word != t->bits_per_word) ||
370 (first->speed_hz != t->speed_hz)) {
Stefan Roese4302a5962014-01-31 13:44:59 +0100371 dev_err(&spi->dev,
372 "bits_per_word/speed_hz should be same for the same SPI transfer\n");
Fabio Estevam75c41082014-12-04 11:15:47 -0200373 return -EINVAL;
Stefan Roese4302a5962014-01-31 13:44:59 +0100374 }
375 }
376
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700377 cs_change = 1;
Stefan Roese4302a5962014-01-31 13:44:59 +0100378 status = -EINVAL;
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700379 list_for_each_entry(t, &m->transfers, transfer_list) {
380 if (t->bits_per_word || t->speed_hz) {
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700381 if (cs_change)
Mingkai Hub36ece82010-10-12 18:18:31 +0800382 status = fsl_spi_setup_transfer(spi, t);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700383 if (status < 0)
384 break;
385 }
386
387 if (cs_change) {
Mingkai Hub36ece82010-10-12 18:18:31 +0800388 fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700389 ndelay(nsecs);
390 }
391 cs_change = t->cs_change;
392 if (t->len)
Mingkai Hub36ece82010-10-12 18:18:31 +0800393 status = fsl_spi_bufs(spi, t, m->is_dma_mapped);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700394 if (status) {
395 status = -EMSGSIZE;
396 break;
397 }
398 m->actual_length += t->len;
399
400 if (t->delay_usecs)
401 udelay(t->delay_usecs);
402
403 if (cs_change) {
404 ndelay(nsecs);
Mingkai Hub36ece82010-10-12 18:18:31 +0800405 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700406 ndelay(nsecs);
407 }
408 }
409
410 m->status = status;
Heiner Kallweitc592bec2014-12-03 07:56:17 +0100411 spi_finalize_current_message(master);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700412
413 if (status || !cs_change) {
414 ndelay(nsecs);
Mingkai Hub36ece82010-10-12 18:18:31 +0800415 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700416 }
417
Mingkai Hub36ece82010-10-12 18:18:31 +0800418 fsl_spi_setup_transfer(spi, NULL);
Heiner Kallweitc592bec2014-12-03 07:56:17 +0100419 return 0;
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700420}
421
Mingkai Hub36ece82010-10-12 18:18:31 +0800422static int fsl_spi_setup(struct spi_device *spi)
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700423{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700424 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +0800425 struct fsl_spi_reg *reg_base;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700426 int retval;
427 u32 hw_mode;
Axel Lind9f26742014-08-31 12:44:09 +0800428 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700429
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700430 if (!spi->max_speed_hz)
431 return -EINVAL;
432
433 if (!cs) {
Axel Lind9f26742014-08-31 12:44:09 +0800434 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700435 if (!cs)
436 return -ENOMEM;
Axel Lind9f26742014-08-31 12:44:09 +0800437 spi_set_ctldata(spi, cs);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700438 }
Anton Vorontsov575c5802009-06-18 16:49:08 -0700439 mpc8xxx_spi = spi_master_get_devdata(spi->master);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700440
Mingkai Hub36ece82010-10-12 18:18:31 +0800441 reg_base = mpc8xxx_spi->reg_base;
442
Thomas Weber88393162010-03-16 11:47:56 +0100443 hw_mode = cs->hw_mode; /* Save original settings */
Mingkai Hub36ece82010-10-12 18:18:31 +0800444 cs->hw_mode = mpc8xxx_spi_read_reg(&reg_base->mode);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700445 /* mask out bits we are going to set */
446 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
447 | SPMODE_REV | SPMODE_LOOP);
448
449 if (spi->mode & SPI_CPHA)
450 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
451 if (spi->mode & SPI_CPOL)
452 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
453 if (!(spi->mode & SPI_LSB_FIRST))
454 cs->hw_mode |= SPMODE_REV;
455 if (spi->mode & SPI_LOOP)
456 cs->hw_mode |= SPMODE_LOOP;
457
Mingkai Hub36ece82010-10-12 18:18:31 +0800458 retval = fsl_spi_setup_transfer(spi, NULL);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700459 if (retval < 0) {
460 cs->hw_mode = hw_mode; /* Restore settings */
461 return retval;
462 }
Andreas Larssonf482cd02013-02-15 16:52:22 +0100463
Andreas Larsson76a74982013-02-15 16:52:27 +0100464 if (mpc8xxx_spi->type == TYPE_GRLIB) {
465 if (gpio_is_valid(spi->cs_gpio)) {
466 int desel;
467
468 retval = gpio_request(spi->cs_gpio,
469 dev_name(&spi->dev));
470 if (retval)
471 return retval;
472
473 desel = !(spi->mode & SPI_CS_HIGH);
474 retval = gpio_direction_output(spi->cs_gpio, desel);
475 if (retval) {
476 gpio_free(spi->cs_gpio);
477 return retval;
478 }
479 } else if (spi->cs_gpio != -ENOENT) {
480 if (spi->cs_gpio < 0)
481 return spi->cs_gpio;
482 return -EINVAL;
483 }
484 /* When spi->cs_gpio == -ENOENT, a hole in the phandle list
485 * indicates to use native chipselect if present, or allow for
486 * an always selected chip
487 */
488 }
489
Andreas Larssonf482cd02013-02-15 16:52:22 +0100490 /* Initialize chipselect - might be active for SPI_CS_HIGH mode */
491 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
492
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700493 return 0;
Kumar Galaccf06992006-05-20 15:00:15 -0700494}
495
Andreas Larsson76a74982013-02-15 16:52:27 +0100496static void fsl_spi_cleanup(struct spi_device *spi)
497{
498 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
Axel Lind9f26742014-08-31 12:44:09 +0800499 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
Andreas Larsson76a74982013-02-15 16:52:27 +0100500
501 if (mpc8xxx_spi->type == TYPE_GRLIB && gpio_is_valid(spi->cs_gpio))
502 gpio_free(spi->cs_gpio);
Axel Lind9f26742014-08-31 12:44:09 +0800503
504 kfree(cs);
505 spi_set_ctldata(spi, NULL);
Andreas Larsson76a74982013-02-15 16:52:27 +0100506}
507
Mingkai Hub36ece82010-10-12 18:18:31 +0800508static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400509{
Mingkai Hub36ece82010-10-12 18:18:31 +0800510 struct fsl_spi_reg *reg_base = mspi->reg_base;
511
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400512 /* We need handle RX first */
513 if (events & SPIE_NE) {
Mingkai Hub36ece82010-10-12 18:18:31 +0800514 u32 rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400515
516 if (mspi->rx)
517 mspi->get_rx(rx_data, mspi);
518 }
519
520 if ((events & SPIE_NF) == 0)
521 /* spin until TX is done */
522 while (((events =
Mingkai Hub36ece82010-10-12 18:18:31 +0800523 mpc8xxx_spi_read_reg(&reg_base->event)) &
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400524 SPIE_NF) == 0)
525 cpu_relax();
526
527 /* Clear the events */
Mingkai Hub36ece82010-10-12 18:18:31 +0800528 mpc8xxx_spi_write_reg(&reg_base->event, events);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400529
530 mspi->count -= 1;
531 if (mspi->count) {
532 u32 word = mspi->get_tx(mspi);
533
Mingkai Hub36ece82010-10-12 18:18:31 +0800534 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400535 } else {
536 complete(&mspi->done);
537 }
538}
539
Mingkai Hub36ece82010-10-12 18:18:31 +0800540static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400541{
542 struct mpc8xxx_spi *mspi = context_data;
543 irqreturn_t ret = IRQ_NONE;
544 u32 events;
Mingkai Hub36ece82010-10-12 18:18:31 +0800545 struct fsl_spi_reg *reg_base = mspi->reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400546
547 /* Get interrupt events(tx/rx) */
Mingkai Hub36ece82010-10-12 18:18:31 +0800548 events = mpc8xxx_spi_read_reg(&reg_base->event);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400549 if (events)
550 ret = IRQ_HANDLED;
551
552 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
553
554 if (mspi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800555 fsl_spi_cpm_irq(mspi, events);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400556 else
Mingkai Hub36ece82010-10-12 18:18:31 +0800557 fsl_spi_cpu_irq(mspi, events);
Kumar Galaccf06992006-05-20 15:00:15 -0700558
559 return ret;
560}
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400561
Mingkai Hub36ece82010-10-12 18:18:31 +0800562static void fsl_spi_remove(struct mpc8xxx_spi *mspi)
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400563{
Mingkai Hub36ece82010-10-12 18:18:31 +0800564 iounmap(mspi->reg_base);
565 fsl_spi_cpm_free(mspi);
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400566}
567
Andreas Larsson447b0c72013-02-15 16:52:26 +0100568static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on)
569{
570 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
571 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base;
572 u32 slvsel;
573 u16 cs = spi->chip_select;
574
Andreas Larsson76a74982013-02-15 16:52:27 +0100575 if (gpio_is_valid(spi->cs_gpio)) {
576 gpio_set_value(spi->cs_gpio, on);
577 } else if (cs < mpc8xxx_spi->native_chipselects) {
578 slvsel = mpc8xxx_spi_read_reg(&reg_base->slvsel);
579 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs));
580 mpc8xxx_spi_write_reg(&reg_base->slvsel, slvsel);
581 }
Andreas Larsson447b0c72013-02-15 16:52:26 +0100582}
583
584static void fsl_spi_grlib_probe(struct device *dev)
585{
Jingoo Han8074cf02013-07-30 16:58:59 +0900586 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
Andreas Larsson447b0c72013-02-15 16:52:26 +0100587 struct spi_master *master = dev_get_drvdata(dev);
588 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
589 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base;
590 int mbits;
591 u32 capabilities;
592
593 capabilities = mpc8xxx_spi_read_reg(&reg_base->cap);
594
595 mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts;
596 mbits = SPCAP_MAXWLEN(capabilities);
597 if (mbits)
598 mpc8xxx_spi->max_bits_per_word = mbits + 1;
599
Andreas Larsson76a74982013-02-15 16:52:27 +0100600 mpc8xxx_spi->native_chipselects = 0;
Andreas Larsson447b0c72013-02-15 16:52:26 +0100601 if (SPCAP_SSEN(capabilities)) {
Andreas Larsson76a74982013-02-15 16:52:27 +0100602 mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities);
Andreas Larsson447b0c72013-02-15 16:52:26 +0100603 mpc8xxx_spi_write_reg(&reg_base->slvsel, 0xffffffff);
604 }
Andreas Larsson76a74982013-02-15 16:52:27 +0100605 master->num_chipselect = mpc8xxx_spi->native_chipselects;
Andreas Larsson447b0c72013-02-15 16:52:26 +0100606 pdata->cs_control = fsl_spi_grlib_cs_control;
607}
608
Grant Likelyfd4a3192012-12-07 16:57:14 +0000609static struct spi_master * fsl_spi_probe(struct device *dev,
Mingkai Hub36ece82010-10-12 18:18:31 +0800610 struct resource *mem, unsigned int irq)
Kumar Galaccf06992006-05-20 15:00:15 -0700611{
Jingoo Han8074cf02013-07-30 16:58:59 +0900612 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
Kumar Galaccf06992006-05-20 15:00:15 -0700613 struct spi_master *master;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700614 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +0800615 struct fsl_spi_reg *reg_base;
Kumar Galaccf06992006-05-20 15:00:15 -0700616 u32 regval;
617 int ret = 0;
618
Anton Vorontsov575c5802009-06-18 16:49:08 -0700619 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
Kumar Galaccf06992006-05-20 15:00:15 -0700620 if (master == NULL) {
621 ret = -ENOMEM;
622 goto err;
623 }
624
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700625 dev_set_drvdata(dev, master);
Kumar Galaccf06992006-05-20 15:00:15 -0700626
Heiner Kallweitc592bec2014-12-03 07:56:17 +0100627 mpc8xxx_spi_probe(dev, mem, irq);
David Brownelle7db06b2009-06-17 16:26:04 -0700628
Mingkai Hub36ece82010-10-12 18:18:31 +0800629 master->setup = fsl_spi_setup;
Andreas Larsson76a74982013-02-15 16:52:27 +0100630 master->cleanup = fsl_spi_cleanup;
Heiner Kallweitc592bec2014-12-03 07:56:17 +0100631 master->transfer_one_message = fsl_spi_do_one_msg;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700632
Anton Vorontsov575c5802009-06-18 16:49:08 -0700633 mpc8xxx_spi = spi_master_get_devdata(master);
Mingkai Hub36ece82010-10-12 18:18:31 +0800634 mpc8xxx_spi->spi_remove = fsl_spi_remove;
Andreas Larsson8922a362013-02-15 16:52:25 +0100635 mpc8xxx_spi->max_bits_per_word = 32;
Andreas Larssonc3f3e772013-02-15 16:52:24 +0100636 mpc8xxx_spi->type = fsl_spi_get_type(dev);
Mingkai Hub36ece82010-10-12 18:18:31 +0800637
638 ret = fsl_spi_cpm_init(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400639 if (ret)
640 goto err_cpm_init;
641
Andreas Larsson447b0c72013-02-15 16:52:26 +0100642 mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
643 if (mpc8xxx_spi->reg_base == NULL) {
644 ret = -ENOMEM;
645 goto err_ioremap;
646 }
647
648 if (mpc8xxx_spi->type == TYPE_GRLIB)
649 fsl_spi_grlib_probe(dev);
650
Axel Linf7343942014-02-13 19:05:38 +0800651 master->bits_per_word_mask =
652 (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32)) &
653 SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word);
654
Andreas Larssonb48c4e32013-02-15 16:52:23 +0100655 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
656 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;
657
658 if (mpc8xxx_spi->set_shifts)
659 /* 8 bits per word and MSB first */
660 mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift,
661 &mpc8xxx_spi->tx_shift, 8, 1);
Joakim Tjernlundf29ba282007-07-17 04:04:12 -0700662
Kumar Galaccf06992006-05-20 15:00:15 -0700663 /* Register for SPI Interrupt */
Mingkai Hub36ece82010-10-12 18:18:31 +0800664 ret = request_irq(mpc8xxx_spi->irq, fsl_spi_irq,
665 0, "fsl_spi", mpc8xxx_spi);
Kumar Galaccf06992006-05-20 15:00:15 -0700666
667 if (ret != 0)
Mingkai Hub36ece82010-10-12 18:18:31 +0800668 goto free_irq;
Kumar Galaccf06992006-05-20 15:00:15 -0700669
Mingkai Hub36ece82010-10-12 18:18:31 +0800670 reg_base = mpc8xxx_spi->reg_base;
Kumar Galaccf06992006-05-20 15:00:15 -0700671
672 /* SPI controller initializations */
Mingkai Hub36ece82010-10-12 18:18:31 +0800673 mpc8xxx_spi_write_reg(&reg_base->mode, 0);
674 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
675 mpc8xxx_spi_write_reg(&reg_base->command, 0);
676 mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
Kumar Galaccf06992006-05-20 15:00:15 -0700677
678 /* Enable SPI interface */
679 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
Andreas Larsson8922a362013-02-15 16:52:25 +0100680 if (mpc8xxx_spi->max_bits_per_word < 8) {
681 regval &= ~SPMODE_LEN(0xF);
682 regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
683 }
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400684 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
Joakim Tjernlundf29ba282007-07-17 04:04:12 -0700685 regval |= SPMODE_OP;
686
Mingkai Hub36ece82010-10-12 18:18:31 +0800687 mpc8xxx_spi_write_reg(&reg_base->mode, regval);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700688
689 ret = spi_register_master(master);
690 if (ret < 0)
691 goto unreg_master;
Kumar Galaccf06992006-05-20 15:00:15 -0700692
Mingkai Hub36ece82010-10-12 18:18:31 +0800693 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400694 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
Kumar Galaccf06992006-05-20 15:00:15 -0700695
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700696 return master;
Kumar Galaccf06992006-05-20 15:00:15 -0700697
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700698unreg_master:
Anton Vorontsov575c5802009-06-18 16:49:08 -0700699 free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
Mingkai Hub36ece82010-10-12 18:18:31 +0800700free_irq:
701 iounmap(mpc8xxx_spi->reg_base);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400702err_ioremap:
Mingkai Hub36ece82010-10-12 18:18:31 +0800703 fsl_spi_cpm_free(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400704err_cpm_init:
Kumar Galaccf06992006-05-20 15:00:15 -0700705 spi_master_put(master);
Kumar Galaccf06992006-05-20 15:00:15 -0700706err:
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700707 return ERR_PTR(ret);
Kumar Galaccf06992006-05-20 15:00:15 -0700708}
709
Mingkai Hub36ece82010-10-12 18:18:31 +0800710static void fsl_spi_cs_control(struct spi_device *spi, bool on)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700711{
Herton Ronaldo Krzesinski067aa482012-05-11 15:29:50 -0700712 struct device *dev = spi->dev.parent->parent;
Jingoo Han8074cf02013-07-30 16:58:59 +0900713 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
714 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700715 u16 cs = spi->chip_select;
716 int gpio = pinfo->gpios[cs];
717 bool alow = pinfo->alow_flags[cs];
718
719 gpio_set_value(gpio, on ^ alow);
720}
721
Mingkai Hub36ece82010-10-12 18:18:31 +0800722static int of_fsl_spi_get_chipselects(struct device *dev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700723{
Grant Likely61c7a082010-04-13 16:12:29 -0700724 struct device_node *np = dev->of_node;
Jingoo Han8074cf02013-07-30 16:58:59 +0900725 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
Anton Vorontsov575c5802009-06-18 16:49:08 -0700726 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
Grant Likelye80beb22013-02-12 17:48:37 +0000727 int ngpios;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700728 int i = 0;
729 int ret;
730
731 ngpios = of_gpio_count(np);
Grant Likelye80beb22013-02-12 17:48:37 +0000732 if (ngpios <= 0) {
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700733 /*
734 * SPI w/o chip-select line. One SPI device is still permitted
735 * though.
736 */
737 pdata->max_chipselect = 1;
738 return 0;
739 }
740
Roel Kluin02141542009-06-16 15:31:15 -0700741 pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700742 if (!pinfo->gpios)
743 return -ENOMEM;
Roel Kluin02141542009-06-16 15:31:15 -0700744 memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios));
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700745
Roel Kluin02141542009-06-16 15:31:15 -0700746 pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags),
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700747 GFP_KERNEL);
748 if (!pinfo->alow_flags) {
749 ret = -ENOMEM;
750 goto err_alloc_flags;
751 }
752
753 for (; i < ngpios; i++) {
754 int gpio;
755 enum of_gpio_flags flags;
756
757 gpio = of_get_gpio_flags(np, i, &flags);
758 if (!gpio_is_valid(gpio)) {
759 dev_err(dev, "invalid gpio #%d: %d\n", i, gpio);
Anton Vorontsov783058f2009-10-12 20:49:22 +0400760 ret = gpio;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700761 goto err_loop;
762 }
763
764 ret = gpio_request(gpio, dev_name(dev));
765 if (ret) {
766 dev_err(dev, "can't request gpio #%d: %d\n", i, ret);
767 goto err_loop;
768 }
769
770 pinfo->gpios[i] = gpio;
771 pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW;
772
773 ret = gpio_direction_output(pinfo->gpios[i],
774 pinfo->alow_flags[i]);
775 if (ret) {
776 dev_err(dev, "can't set output direction for gpio "
777 "#%d: %d\n", i, ret);
778 goto err_loop;
779 }
780 }
781
782 pdata->max_chipselect = ngpios;
Mingkai Hub36ece82010-10-12 18:18:31 +0800783 pdata->cs_control = fsl_spi_cs_control;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700784
785 return 0;
786
787err_loop:
788 while (i >= 0) {
789 if (gpio_is_valid(pinfo->gpios[i]))
790 gpio_free(pinfo->gpios[i]);
791 i--;
792 }
793
794 kfree(pinfo->alow_flags);
795 pinfo->alow_flags = NULL;
796err_alloc_flags:
797 kfree(pinfo->gpios);
798 pinfo->gpios = NULL;
799 return ret;
800}
801
Mingkai Hub36ece82010-10-12 18:18:31 +0800802static int of_fsl_spi_free_chipselects(struct device *dev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700803{
Jingoo Han8074cf02013-07-30 16:58:59 +0900804 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
Anton Vorontsov575c5802009-06-18 16:49:08 -0700805 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700806 int i;
807
808 if (!pinfo->gpios)
809 return 0;
810
811 for (i = 0; i < pdata->max_chipselect; i++) {
812 if (gpio_is_valid(pinfo->gpios[i]))
813 gpio_free(pinfo->gpios[i]);
814 }
815
816 kfree(pinfo->gpios);
817 kfree(pinfo->alow_flags);
818 return 0;
819}
820
Grant Likelyfd4a3192012-12-07 16:57:14 +0000821static int of_fsl_spi_probe(struct platform_device *ofdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700822{
823 struct device *dev = &ofdev->dev;
Grant Likely61c7a082010-04-13 16:12:29 -0700824 struct device_node *np = ofdev->dev.of_node;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700825 struct spi_master *master;
826 struct resource mem;
Andreas Larsson447b0c72013-02-15 16:52:26 +0100827 int irq, type;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700828 int ret = -ENOMEM;
829
Grant Likely18d306d2011-02-22 21:02:43 -0700830 ret = of_mpc8xxx_spi_probe(ofdev);
Mingkai Hub36ece82010-10-12 18:18:31 +0800831 if (ret)
832 return ret;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700833
Andreas Larsson447b0c72013-02-15 16:52:26 +0100834 type = fsl_spi_get_type(&ofdev->dev);
835 if (type == TYPE_FSL) {
836 ret = of_fsl_spi_get_chipselects(dev);
837 if (ret)
838 goto err;
839 }
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700840
841 ret = of_address_to_resource(np, 0, &mem);
842 if (ret)
843 goto err;
844
Andreas Larssone8beacb2013-02-15 16:52:21 +0100845 irq = irq_of_parse_and_map(np, 0);
846 if (!irq) {
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700847 ret = -EINVAL;
848 goto err;
849 }
850
Andreas Larssone8beacb2013-02-15 16:52:21 +0100851 master = fsl_spi_probe(dev, &mem, irq);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700852 if (IS_ERR(master)) {
853 ret = PTR_ERR(master);
854 goto err;
855 }
856
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700857 return 0;
858
859err:
Andreas Larsson447b0c72013-02-15 16:52:26 +0100860 if (type == TYPE_FSL)
861 of_fsl_spi_free_chipselects(dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700862 return ret;
863}
864
Grant Likelyfd4a3192012-12-07 16:57:14 +0000865static int of_fsl_spi_remove(struct platform_device *ofdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700866{
Jingoo Han24b5a822013-05-23 19:20:40 +0900867 struct spi_master *master = platform_get_drvdata(ofdev);
Andreas Larsson447b0c72013-02-15 16:52:26 +0100868 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700869 int ret;
870
Anton Vorontsov575c5802009-06-18 16:49:08 -0700871 ret = mpc8xxx_spi_remove(&ofdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700872 if (ret)
873 return ret;
Andreas Larsson447b0c72013-02-15 16:52:26 +0100874 if (mpc8xxx_spi->type == TYPE_FSL)
875 of_fsl_spi_free_chipselects(&ofdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700876 return 0;
877}
878
Grant Likely18d306d2011-02-22 21:02:43 -0700879static struct platform_driver of_fsl_spi_driver = {
Grant Likely40182942010-04-13 16:13:02 -0700880 .driver = {
Mingkai Hub36ece82010-10-12 18:18:31 +0800881 .name = "fsl_spi",
Mingkai Hub36ece82010-10-12 18:18:31 +0800882 .of_match_table = of_fsl_spi_match,
Grant Likely40182942010-04-13 16:13:02 -0700883 },
Mingkai Hub36ece82010-10-12 18:18:31 +0800884 .probe = of_fsl_spi_probe,
Grant Likelyfd4a3192012-12-07 16:57:14 +0000885 .remove = of_fsl_spi_remove,
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700886};
887
888#ifdef CONFIG_MPC832x_RDB
889/*
Mingkai Hub36ece82010-10-12 18:18:31 +0800890 * XXX XXX XXX
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700891 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
892 * only. The driver should go away soon, since newer MPC8323E-RDB's device
893 * tree can work with OpenFirmware driver. But for now we support old trees
894 * as well.
895 */
Grant Likelyfd4a3192012-12-07 16:57:14 +0000896static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700897{
898 struct resource *mem;
Uwe Kleine-Könige9a172f2010-01-20 13:49:44 -0700899 int irq;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700900 struct spi_master *master;
901
Jingoo Han8074cf02013-07-30 16:58:59 +0900902 if (!dev_get_platdata(&pdev->dev))
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700903 return -EINVAL;
904
905 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
906 if (!mem)
907 return -EINVAL;
908
909 irq = platform_get_irq(pdev, 0);
Uwe Kleine-Könige9a172f2010-01-20 13:49:44 -0700910 if (irq <= 0)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700911 return -EINVAL;
912
Mingkai Hub36ece82010-10-12 18:18:31 +0800913 master = fsl_spi_probe(&pdev->dev, mem, irq);
Rusty Russell8c6ffba2013-07-15 11:20:32 +0930914 return PTR_ERR_OR_ZERO(master);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700915}
916
Grant Likelyfd4a3192012-12-07 16:57:14 +0000917static int plat_mpc8xxx_spi_remove(struct platform_device *pdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700918{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700919 return mpc8xxx_spi_remove(&pdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700920}
921
Anton Vorontsov575c5802009-06-18 16:49:08 -0700922MODULE_ALIAS("platform:mpc8xxx_spi");
923static struct platform_driver mpc8xxx_spi_driver = {
924 .probe = plat_mpc8xxx_spi_probe,
Grant Likelyfd4a3192012-12-07 16:57:14 +0000925 .remove = plat_mpc8xxx_spi_remove,
Kumar Galaccf06992006-05-20 15:00:15 -0700926 .driver = {
Anton Vorontsov575c5802009-06-18 16:49:08 -0700927 .name = "mpc8xxx_spi",
Kumar Galaccf06992006-05-20 15:00:15 -0700928 },
929};
930
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700931static bool legacy_driver_failed;
932
933static void __init legacy_driver_register(void)
934{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700935 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700936}
937
938static void __exit legacy_driver_unregister(void)
939{
940 if (legacy_driver_failed)
941 return;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700942 platform_driver_unregister(&mpc8xxx_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700943}
944#else
945static void __init legacy_driver_register(void) {}
946static void __exit legacy_driver_unregister(void) {}
947#endif /* CONFIG_MPC832x_RDB */
948
Mingkai Hub36ece82010-10-12 18:18:31 +0800949static int __init fsl_spi_init(void)
Kumar Galaccf06992006-05-20 15:00:15 -0700950{
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700951 legacy_driver_register();
Grant Likely18d306d2011-02-22 21:02:43 -0700952 return platform_driver_register(&of_fsl_spi_driver);
Kumar Galaccf06992006-05-20 15:00:15 -0700953}
Mingkai Hub36ece82010-10-12 18:18:31 +0800954module_init(fsl_spi_init);
Kumar Galaccf06992006-05-20 15:00:15 -0700955
Mingkai Hub36ece82010-10-12 18:18:31 +0800956static void __exit fsl_spi_exit(void)
Kumar Galaccf06992006-05-20 15:00:15 -0700957{
Grant Likely18d306d2011-02-22 21:02:43 -0700958 platform_driver_unregister(&of_fsl_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700959 legacy_driver_unregister();
Kumar Galaccf06992006-05-20 15:00:15 -0700960}
Mingkai Hub36ece82010-10-12 18:18:31 +0800961module_exit(fsl_spi_exit);
Kumar Galaccf06992006-05-20 15:00:15 -0700962
963MODULE_AUTHOR("Kumar Gala");
Mingkai Hub36ece82010-10-12 18:18:31 +0800964MODULE_DESCRIPTION("Simple Freescale SPI Driver");
Kumar Galaccf06992006-05-20 15:00:15 -0700965MODULE_LICENSE("GPL");