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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 *
Kumar Galaccf06992006-05-20 15:00:15 -070013 * 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/module.h>
Kumar Galaccf06992006-05-20 15:00:15 -070019#include <linux/types.h>
20#include <linux/kernel.h>
Kumar Galaccf06992006-05-20 15:00:15 -070021#include <linux/interrupt.h>
22#include <linux/delay.h>
23#include <linux/irq.h>
Kumar Galaccf06992006-05-20 15:00:15 -070024#include <linux/spi/spi.h>
25#include <linux/spi/spi_bitbang.h>
26#include <linux/platform_device.h>
27#include <linux/fsl_devices.h>
Anton Vorontsov4c1fba42009-10-12 20:49:27 +040028#include <linux/dma-mapping.h>
29#include <linux/mm.h>
30#include <linux/mutex.h>
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -070031#include <linux/of.h>
32#include <linux/of_platform.h>
33#include <linux/gpio.h>
34#include <linux/of_gpio.h>
Kumar Galaccf06992006-05-20 15:00:15 -070035
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -070036#include <sysdev/fsl_soc.h>
Anton Vorontsov4c1fba42009-10-12 20:49:27 +040037#include <asm/cpm.h>
38#include <asm/qe.h>
Mingkai Hub36ece82010-10-12 18:18:31 +080039
40#include "spi_fsl_lib.h"
Kumar Galaccf06992006-05-20 15:00:15 -070041
Anton Vorontsov4c1fba42009-10-12 20:49:27 +040042/* CPM1 and CPM2 are mutually exclusive. */
43#ifdef CONFIG_CPM1
44#include <asm/cpm1.h>
45#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0)
46#else
47#include <asm/cpm2.h>
48#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0)
49#endif
50
Kumar Galaccf06992006-05-20 15:00:15 -070051/* SPI Controller registers */
Mingkai Hub36ece82010-10-12 18:18:31 +080052struct fsl_spi_reg {
Kumar Galaccf06992006-05-20 15:00:15 -070053 u8 res1[0x20];
54 __be32 mode;
55 __be32 event;
56 __be32 mask;
57 __be32 command;
58 __be32 transmit;
59 __be32 receive;
60};
61
62/* SPI Controller mode register definitions */
Anton Vorontsov2a485d72007-07-31 00:38:45 -070063#define SPMODE_LOOP (1 << 30)
Kumar Galaccf06992006-05-20 15:00:15 -070064#define SPMODE_CI_INACTIVEHIGH (1 << 29)
65#define SPMODE_CP_BEGIN_EDGECLK (1 << 28)
66#define SPMODE_DIV16 (1 << 27)
67#define SPMODE_REV (1 << 26)
68#define SPMODE_MS (1 << 25)
69#define SPMODE_ENABLE (1 << 24)
70#define SPMODE_LEN(x) ((x) << 20)
71#define SPMODE_PM(x) ((x) << 16)
Joakim Tjernlundf29ba282007-07-17 04:04:12 -070072#define SPMODE_OP (1 << 14)
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -070073#define SPMODE_CG(x) ((x) << 7)
Kumar Galaccf06992006-05-20 15:00:15 -070074
75/*
76 * Default for SPI Mode:
Mingkai Hub36ece82010-10-12 18:18:31 +080077 * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk
Kumar Galaccf06992006-05-20 15:00:15 -070078 */
79#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \
80 SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf))
81
82/* SPIE register values */
83#define SPIE_NE 0x00000200 /* Not empty */
84#define SPIE_NF 0x00000100 /* Not full */
85
86/* SPIM register values */
87#define SPIM_NE 0x00000200 /* Not empty */
88#define SPIM_NF 0x00000100 /* Not full */
89
Anton Vorontsov4c1fba42009-10-12 20:49:27 +040090#define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */
91#define SPIE_RXB 0x00000100 /* Last char is written to rx buf */
92
93/* SPCOM register values */
94#define SPCOM_STR (1 << 23) /* Start transmit */
95
96#define SPI_PRAM_SIZE 0x100
97#define SPI_MRBLR ((unsigned int)PAGE_SIZE)
98
Mingkai Hub36ece82010-10-12 18:18:31 +080099static void *fsl_dummy_rx;
100static DEFINE_MUTEX(fsl_dummy_rx_lock);
101static int fsl_dummy_rx_refcnt;
Kumar Galaccf06992006-05-20 15:00:15 -0700102
Mingkai Hub36ece82010-10-12 18:18:31 +0800103static void fsl_spi_change_mode(struct spi_device *spi)
Anton Vorontsova35c1712009-10-12 20:49:24 +0400104{
105 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
106 struct spi_mpc8xxx_cs *cs = spi->controller_state;
Mingkai Hub36ece82010-10-12 18:18:31 +0800107 struct fsl_spi_reg *reg_base = mspi->reg_base;
108 __be32 __iomem *mode = &reg_base->mode;
Anton Vorontsova35c1712009-10-12 20:49:24 +0400109 unsigned long flags;
110
111 if (cs->hw_mode == mpc8xxx_spi_read_reg(mode))
112 return;
113
114 /* Turn off IRQs locally to minimize time that SPI is disabled. */
115 local_irq_save(flags);
116
117 /* Turn off SPI unit prior changing mode */
118 mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
Anton Vorontsova35c1712009-10-12 20:49:24 +0400119
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400120 /* When in CPM mode, we need to reinit tx and rx. */
121 if (mspi->flags & SPI_CPM_MODE) {
122 if (mspi->flags & SPI_QE) {
123 qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock,
124 QE_CR_PROTOCOL_UNSPECIFIED, 0);
125 } else {
126 cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
127 if (mspi->flags & SPI_CPM1) {
128 out_be16(&mspi->pram->rbptr,
129 in_be16(&mspi->pram->rbase));
130 out_be16(&mspi->pram->tbptr,
131 in_be16(&mspi->pram->tbase));
132 }
133 }
134 }
Joakim Tjernlundf9218c22010-05-22 02:18:02 -0600135 mpc8xxx_spi_write_reg(mode, cs->hw_mode);
Anton Vorontsova35c1712009-10-12 20:49:24 +0400136 local_irq_restore(flags);
137}
138
Mingkai Hub36ece82010-10-12 18:18:31 +0800139static void fsl_spi_chipselect(struct spi_device *spi, int value)
Kumar Galaccf06992006-05-20 15:00:15 -0700140{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700141 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
Anton Vorontsov364fdbc2009-03-31 15:24:36 -0700142 struct fsl_spi_platform_data *pdata = spi->dev.parent->platform_data;
143 bool pol = spi->mode & SPI_CS_HIGH;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700144 struct spi_mpc8xxx_cs *cs = spi->controller_state;
Kumar Galaccf06992006-05-20 15:00:15 -0700145
Kumar Galaccf06992006-05-20 15:00:15 -0700146 if (value == BITBANG_CS_INACTIVE) {
Anton Vorontsov364fdbc2009-03-31 15:24:36 -0700147 if (pdata->cs_control)
148 pdata->cs_control(spi, !pol);
Kumar Galaccf06992006-05-20 15:00:15 -0700149 }
150
151 if (value == BITBANG_CS_ACTIVE) {
Anton Vorontsov575c5802009-06-18 16:49:08 -0700152 mpc8xxx_spi->rx_shift = cs->rx_shift;
153 mpc8xxx_spi->tx_shift = cs->tx_shift;
154 mpc8xxx_spi->get_rx = cs->get_rx;
155 mpc8xxx_spi->get_tx = cs->get_tx;
Kumar Galaccf06992006-05-20 15:00:15 -0700156
Mingkai Hub36ece82010-10-12 18:18:31 +0800157 fsl_spi_change_mode(spi);
Kumar Galaccf06992006-05-20 15:00:15 -0700158
Anton Vorontsov364fdbc2009-03-31 15:24:36 -0700159 if (pdata->cs_control)
160 pdata->cs_control(spi, pol);
Kumar Galaccf06992006-05-20 15:00:15 -0700161 }
162}
163
Mingkai Hub36ece82010-10-12 18:18:31 +0800164static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
165 struct spi_device *spi,
166 struct mpc8xxx_spi *mpc8xxx_spi,
167 int bits_per_word)
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000168{
169 cs->rx_shift = 0;
170 cs->tx_shift = 0;
171 if (bits_per_word <= 8) {
172 cs->get_rx = mpc8xxx_spi_rx_buf_u8;
173 cs->get_tx = mpc8xxx_spi_tx_buf_u8;
174 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
175 cs->rx_shift = 16;
176 cs->tx_shift = 24;
177 }
178 } else if (bits_per_word <= 16) {
179 cs->get_rx = mpc8xxx_spi_rx_buf_u16;
180 cs->get_tx = mpc8xxx_spi_tx_buf_u16;
181 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
182 cs->rx_shift = 16;
183 cs->tx_shift = 16;
184 }
185 } 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
191 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE &&
192 spi->mode & SPI_LSB_FIRST) {
193 cs->tx_shift = 0;
194 if (bits_per_word <= 8)
195 cs->rx_shift = 8;
196 else
197 cs->rx_shift = 0;
198 }
199 mpc8xxx_spi->rx_shift = cs->rx_shift;
200 mpc8xxx_spi->tx_shift = cs->tx_shift;
201 mpc8xxx_spi->get_rx = cs->get_rx;
202 mpc8xxx_spi->get_tx = cs->get_tx;
203
204 return bits_per_word;
205}
206
Mingkai Hub36ece82010-10-12 18:18:31 +0800207static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
208 struct spi_device *spi,
209 int bits_per_word)
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000210{
211 /* QE uses Little Endian for words > 8
212 * so transform all words > 8 into 8 bits
213 * Unfortnatly that doesn't work for LSB so
214 * reject these for now */
215 /* Note: 32 bits word, LSB works iff
216 * tfcr/rfcr is set to CPMFCR_GBL */
217 if (spi->mode & SPI_LSB_FIRST &&
218 bits_per_word > 8)
219 return -EINVAL;
220 if (bits_per_word > 8)
221 return 8; /* pretend its 8 bits */
222 return bits_per_word;
223}
224
Mingkai Hub36ece82010-10-12 18:18:31 +0800225static int fsl_spi_setup_transfer(struct spi_device *spi,
226 struct spi_transfer *t)
Kumar Galaccf06992006-05-20 15:00:15 -0700227{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700228 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +0800229 int bits_per_word = 0;
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000230 u8 pm;
Mingkai Hub36ece82010-10-12 18:18:31 +0800231 u32 hz = 0;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700232 struct spi_mpc8xxx_cs *cs = spi->controller_state;
Kumar Galaccf06992006-05-20 15:00:15 -0700233
Anton Vorontsov575c5802009-06-18 16:49:08 -0700234 mpc8xxx_spi = spi_master_get_devdata(spi->master);
Kumar Galaccf06992006-05-20 15:00:15 -0700235
236 if (t) {
237 bits_per_word = t->bits_per_word;
238 hz = t->speed_hz;
Kumar Galaccf06992006-05-20 15:00:15 -0700239 }
240
241 /* spi_transfer level calls that work per-word */
242 if (!bits_per_word)
243 bits_per_word = spi->bits_per_word;
244
245 /* Make sure its a bit width we support [4..16, 32] */
246 if ((bits_per_word < 4)
247 || ((bits_per_word > 16) && (bits_per_word != 32)))
248 return -EINVAL;
249
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700250 if (!hz)
251 hz = spi->max_speed_hz;
252
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000253 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
254 bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
255 mpc8xxx_spi,
256 bits_per_word);
257 else if (mpc8xxx_spi->flags & SPI_QE)
258 bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
259 bits_per_word);
Kumar Galaccf06992006-05-20 15:00:15 -0700260
Joakim Tjernlund0398fb72010-05-14 09:14:26 +0000261 if (bits_per_word < 0)
262 return bits_per_word;
Kumar Galaccf06992006-05-20 15:00:15 -0700263
264 if (bits_per_word == 32)
265 bits_per_word = 0;
266 else
267 bits_per_word = bits_per_word - 1;
268
Anton Vorontsov32421da2007-07-31 00:38:41 -0700269 /* mask out bits we are going to set */
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700270 cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
271 | SPMODE_PM(0xF));
Kumar Galaccf06992006-05-20 15:00:15 -0700272
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700273 cs->hw_mode |= SPMODE_LEN(bits_per_word);
Kumar Galaccf06992006-05-20 15:00:15 -0700274
Anton Vorontsov575c5802009-06-18 16:49:08 -0700275 if ((mpc8xxx_spi->spibrg / hz) > 64) {
Peter Korsgaard53604db2008-09-13 02:33:14 -0700276 cs->hw_mode |= SPMODE_DIV16;
Ernst Schwab4f4517c2010-02-16 21:02:57 -0700277 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
Anton Vorontsovfd8a11e2009-06-18 16:49:01 -0700278
279 WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. "
280 "Will use %d Hz instead.\n", dev_name(&spi->dev),
Anton Vorontsov575c5802009-06-18 16:49:08 -0700281 hz, mpc8xxx_spi->spibrg / 1024);
Anton Vorontsovfd8a11e2009-06-18 16:49:01 -0700282 if (pm > 16)
Peter Korsgaard53604db2008-09-13 02:33:14 -0700283 pm = 16;
Mingkai Hub36ece82010-10-12 18:18:31 +0800284 } else {
Ernst Schwab4f4517c2010-02-16 21:02:57 -0700285 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
Mingkai Hub36ece82010-10-12 18:18:31 +0800286 }
Chen Gonga61f5342008-07-23 21:29:52 -0700287 if (pm)
288 pm--;
289
290 cs->hw_mode |= SPMODE_PM(pm);
David Brownelldccd5732007-07-17 04:04:02 -0700291
Mingkai Hub36ece82010-10-12 18:18:31 +0800292 fsl_spi_change_mode(spi);
Kumar Galaccf06992006-05-20 15:00:15 -0700293 return 0;
294}
295
Mingkai Hub36ece82010-10-12 18:18:31 +0800296static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
Kumar Galaccf06992006-05-20 15:00:15 -0700297{
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400298 struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd;
299 struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd;
300 unsigned int xfer_len = min(mspi->count, SPI_MRBLR);
301 unsigned int xfer_ofs;
Mingkai Hub36ece82010-10-12 18:18:31 +0800302 struct fsl_spi_reg *reg_base = mspi->reg_base;
Kumar Galaccf06992006-05-20 15:00:15 -0700303
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400304 xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
Kumar Galaccf06992006-05-20 15:00:15 -0700305
christophe leroy37880c92010-09-16 09:05:25 +0200306 if (mspi->rx_dma == mspi->dma_dummy_rx)
307 out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
308 else
309 out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400310 out_be16(&rx_bd->cbd_datlen, 0);
311 out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);
312
christophe leroy37880c92010-09-16 09:05:25 +0200313 if (mspi->tx_dma == mspi->dma_dummy_tx)
314 out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
315 else
316 out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400317 out_be16(&tx_bd->cbd_datlen, xfer_len);
318 out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
319 BD_SC_LAST);
320
321 /* start transfer */
Mingkai Hub36ece82010-10-12 18:18:31 +0800322 mpc8xxx_spi_write_reg(&reg_base->command, SPCOM_STR);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400323}
324
Mingkai Hub36ece82010-10-12 18:18:31 +0800325static int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400326 struct spi_transfer *t, bool is_dma_mapped)
327{
328 struct device *dev = mspi->dev;
Mingkai Hub36ece82010-10-12 18:18:31 +0800329 struct fsl_spi_reg *reg_base = mspi->reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400330
331 if (is_dma_mapped) {
332 mspi->map_tx_dma = 0;
333 mspi->map_rx_dma = 0;
334 } else {
335 mspi->map_tx_dma = 1;
336 mspi->map_rx_dma = 1;
337 }
338
339 if (!t->tx_buf) {
340 mspi->tx_dma = mspi->dma_dummy_tx;
341 mspi->map_tx_dma = 0;
342 }
343
344 if (!t->rx_buf) {
345 mspi->rx_dma = mspi->dma_dummy_rx;
346 mspi->map_rx_dma = 0;
347 }
348
349 if (mspi->map_tx_dma) {
350 void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */
351
352 mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len,
353 DMA_TO_DEVICE);
354 if (dma_mapping_error(dev, mspi->tx_dma)) {
355 dev_err(dev, "unable to map tx dma\n");
356 return -ENOMEM;
357 }
Joakim Tjernlundf9218c22010-05-22 02:18:02 -0600358 } else if (t->tx_buf) {
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400359 mspi->tx_dma = t->tx_dma;
360 }
361
362 if (mspi->map_rx_dma) {
363 mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len,
364 DMA_FROM_DEVICE);
365 if (dma_mapping_error(dev, mspi->rx_dma)) {
366 dev_err(dev, "unable to map rx dma\n");
367 goto err_rx_dma;
368 }
Joakim Tjernlundf9218c22010-05-22 02:18:02 -0600369 } else if (t->rx_buf) {
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400370 mspi->rx_dma = t->rx_dma;
371 }
372
373 /* enable rx ints */
Mingkai Hub36ece82010-10-12 18:18:31 +0800374 mpc8xxx_spi_write_reg(&reg_base->mask, SPIE_RXB);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400375
376 mspi->xfer_in_progress = t;
377 mspi->count = t->len;
378
379 /* start CPM transfers */
Mingkai Hub36ece82010-10-12 18:18:31 +0800380 fsl_spi_cpm_bufs_start(mspi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400381
382 return 0;
383
384err_rx_dma:
385 if (mspi->map_tx_dma)
386 dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
387 return -ENOMEM;
388}
389
Mingkai Hub36ece82010-10-12 18:18:31 +0800390static void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400391{
392 struct device *dev = mspi->dev;
393 struct spi_transfer *t = mspi->xfer_in_progress;
394
395 if (mspi->map_tx_dma)
396 dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
Joakim Tjernlund338ff292010-05-17 13:17:10 +0000397 if (mspi->map_rx_dma)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400398 dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
399 mspi->xfer_in_progress = NULL;
400}
401
Mingkai Hub36ece82010-10-12 18:18:31 +0800402static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400403 struct spi_transfer *t, unsigned int len)
404{
405 u32 word;
Mingkai Hub36ece82010-10-12 18:18:31 +0800406 struct fsl_spi_reg *reg_base = mspi->reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400407
408 mspi->count = len;
409
410 /* enable rx ints */
Mingkai Hub36ece82010-10-12 18:18:31 +0800411 mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400412
413 /* transmit word */
414 word = mspi->get_tx(mspi);
Mingkai Hub36ece82010-10-12 18:18:31 +0800415 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400416
417 return 0;
418}
419
Mingkai Hub36ece82010-10-12 18:18:31 +0800420static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400421 bool is_dma_mapped)
422{
423 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
Mingkai Hub36ece82010-10-12 18:18:31 +0800424 struct fsl_spi_reg *reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400425 unsigned int len = t->len;
426 u8 bits_per_word;
427 int ret;
428
Mingkai Hub36ece82010-10-12 18:18:31 +0800429 reg_base = mpc8xxx_spi->reg_base;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700430 bits_per_word = spi->bits_per_word;
431 if (t->bits_per_word)
432 bits_per_word = t->bits_per_word;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400433
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700434 if (bits_per_word > 8) {
435 /* invalid length? */
436 if (len & 1)
437 return -EINVAL;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700438 len /= 2;
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700439 }
440 if (bits_per_word > 16) {
441 /* invalid length? */
442 if (len & 1)
443 return -EINVAL;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700444 len /= 2;
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700445 }
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400446
447 mpc8xxx_spi->tx = t->tx_buf;
448 mpc8xxx_spi->rx = t->rx_buf;
Peter Korsgaardaa77d962008-09-13 02:33:15 -0700449
Anton Vorontsov575c5802009-06-18 16:49:08 -0700450 INIT_COMPLETION(mpc8xxx_spi->done);
Kumar Galaccf06992006-05-20 15:00:15 -0700451
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400452 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800453 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400454 else
Mingkai Hub36ece82010-10-12 18:18:31 +0800455 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400456 if (ret)
457 return ret;
Kumar Galaccf06992006-05-20 15:00:15 -0700458
Anton Vorontsov575c5802009-06-18 16:49:08 -0700459 wait_for_completion(&mpc8xxx_spi->done);
Kumar Galaccf06992006-05-20 15:00:15 -0700460
461 /* disable rx ints */
Mingkai Hub36ece82010-10-12 18:18:31 +0800462 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
Kumar Galaccf06992006-05-20 15:00:15 -0700463
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400464 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800465 fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400466
Anton Vorontsov575c5802009-06-18 16:49:08 -0700467 return mpc8xxx_spi->count;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700468}
469
Mingkai Hub36ece82010-10-12 18:18:31 +0800470static void fsl_spi_do_one_msg(struct spi_message *m)
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700471{
472 struct spi_device *spi = m->spi;
473 struct spi_transfer *t;
474 unsigned int cs_change;
475 const int nsecs = 50;
476 int status;
477
478 cs_change = 1;
479 status = 0;
480 list_for_each_entry(t, &m->transfers, transfer_list) {
481 if (t->bits_per_word || t->speed_hz) {
482 /* Don't allow changes if CS is active */
483 status = -EINVAL;
484
485 if (cs_change)
Mingkai Hub36ece82010-10-12 18:18:31 +0800486 status = fsl_spi_setup_transfer(spi, t);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700487 if (status < 0)
488 break;
489 }
490
491 if (cs_change) {
Mingkai Hub36ece82010-10-12 18:18:31 +0800492 fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700493 ndelay(nsecs);
494 }
495 cs_change = t->cs_change;
496 if (t->len)
Mingkai Hub36ece82010-10-12 18:18:31 +0800497 status = fsl_spi_bufs(spi, t, m->is_dma_mapped);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700498 if (status) {
499 status = -EMSGSIZE;
500 break;
501 }
502 m->actual_length += t->len;
503
504 if (t->delay_usecs)
505 udelay(t->delay_usecs);
506
507 if (cs_change) {
508 ndelay(nsecs);
Mingkai Hub36ece82010-10-12 18:18:31 +0800509 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700510 ndelay(nsecs);
511 }
512 }
513
514 m->status = status;
515 m->complete(m->context);
516
517 if (status || !cs_change) {
518 ndelay(nsecs);
Mingkai Hub36ece82010-10-12 18:18:31 +0800519 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700520 }
521
Mingkai Hub36ece82010-10-12 18:18:31 +0800522 fsl_spi_setup_transfer(spi, NULL);
Anton Vorontsovb9b9af12009-06-18 16:49:06 -0700523}
524
Mingkai Hub36ece82010-10-12 18:18:31 +0800525static int fsl_spi_setup(struct spi_device *spi)
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700526{
Anton Vorontsov575c5802009-06-18 16:49:08 -0700527 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +0800528 struct fsl_spi_reg *reg_base;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700529 int retval;
530 u32 hw_mode;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700531 struct spi_mpc8xxx_cs *cs = spi->controller_state;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700532
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700533 if (!spi->max_speed_hz)
534 return -EINVAL;
535
536 if (!cs) {
537 cs = kzalloc(sizeof *cs, GFP_KERNEL);
538 if (!cs)
539 return -ENOMEM;
540 spi->controller_state = cs;
541 }
Anton Vorontsov575c5802009-06-18 16:49:08 -0700542 mpc8xxx_spi = spi_master_get_devdata(spi->master);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700543
Mingkai Hub36ece82010-10-12 18:18:31 +0800544 reg_base = mpc8xxx_spi->reg_base;
545
Thomas Weber88393162010-03-16 11:47:56 +0100546 hw_mode = cs->hw_mode; /* Save original settings */
Mingkai Hub36ece82010-10-12 18:18:31 +0800547 cs->hw_mode = mpc8xxx_spi_read_reg(&reg_base->mode);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700548 /* mask out bits we are going to set */
549 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
550 | SPMODE_REV | SPMODE_LOOP);
551
552 if (spi->mode & SPI_CPHA)
553 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
554 if (spi->mode & SPI_CPOL)
555 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
556 if (!(spi->mode & SPI_LSB_FIRST))
557 cs->hw_mode |= SPMODE_REV;
558 if (spi->mode & SPI_LOOP)
559 cs->hw_mode |= SPMODE_LOOP;
560
Mingkai Hub36ece82010-10-12 18:18:31 +0800561 retval = fsl_spi_setup_transfer(spi, NULL);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700562 if (retval < 0) {
563 cs->hw_mode = hw_mode; /* Restore settings */
564 return retval;
565 }
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700566 return 0;
Kumar Galaccf06992006-05-20 15:00:15 -0700567}
568
Mingkai Hub36ece82010-10-12 18:18:31 +0800569static void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events)
Kumar Galaccf06992006-05-20 15:00:15 -0700570{
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400571 u16 len;
Mingkai Hub36ece82010-10-12 18:18:31 +0800572 struct fsl_spi_reg *reg_base = mspi->reg_base;
Kumar Galaccf06992006-05-20 15:00:15 -0700573
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400574 dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__,
575 in_be16(&mspi->rx_bd->cbd_datlen), mspi->count);
Kumar Galaccf06992006-05-20 15:00:15 -0700576
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400577 len = in_be16(&mspi->rx_bd->cbd_datlen);
578 if (len > mspi->count) {
579 WARN_ON(1);
580 len = mspi->count;
Kumar Galaccf06992006-05-20 15:00:15 -0700581 }
582
583 /* Clear the events */
Mingkai Hub36ece82010-10-12 18:18:31 +0800584 mpc8xxx_spi_write_reg(&reg_base->event, events);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400585
586 mspi->count -= len;
587 if (mspi->count)
Mingkai Hub36ece82010-10-12 18:18:31 +0800588 fsl_spi_cpm_bufs_start(mspi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400589 else
590 complete(&mspi->done);
591}
592
Mingkai Hub36ece82010-10-12 18:18:31 +0800593static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400594{
Mingkai Hub36ece82010-10-12 18:18:31 +0800595 struct fsl_spi_reg *reg_base = mspi->reg_base;
596
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400597 /* We need handle RX first */
598 if (events & SPIE_NE) {
Mingkai Hub36ece82010-10-12 18:18:31 +0800599 u32 rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400600
601 if (mspi->rx)
602 mspi->get_rx(rx_data, mspi);
603 }
604
605 if ((events & SPIE_NF) == 0)
606 /* spin until TX is done */
607 while (((events =
Mingkai Hub36ece82010-10-12 18:18:31 +0800608 mpc8xxx_spi_read_reg(&reg_base->event)) &
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400609 SPIE_NF) == 0)
610 cpu_relax();
611
612 /* Clear the events */
Mingkai Hub36ece82010-10-12 18:18:31 +0800613 mpc8xxx_spi_write_reg(&reg_base->event, events);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400614
615 mspi->count -= 1;
616 if (mspi->count) {
617 u32 word = mspi->get_tx(mspi);
618
Mingkai Hub36ece82010-10-12 18:18:31 +0800619 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400620 } else {
621 complete(&mspi->done);
622 }
623}
624
Mingkai Hub36ece82010-10-12 18:18:31 +0800625static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400626{
627 struct mpc8xxx_spi *mspi = context_data;
628 irqreturn_t ret = IRQ_NONE;
629 u32 events;
Mingkai Hub36ece82010-10-12 18:18:31 +0800630 struct fsl_spi_reg *reg_base = mspi->reg_base;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400631
632 /* Get interrupt events(tx/rx) */
Mingkai Hub36ece82010-10-12 18:18:31 +0800633 events = mpc8xxx_spi_read_reg(&reg_base->event);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400634 if (events)
635 ret = IRQ_HANDLED;
636
637 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
638
639 if (mspi->flags & SPI_CPM_MODE)
Mingkai Hub36ece82010-10-12 18:18:31 +0800640 fsl_spi_cpm_irq(mspi, events);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400641 else
Mingkai Hub36ece82010-10-12 18:18:31 +0800642 fsl_spi_cpu_irq(mspi, events);
Kumar Galaccf06992006-05-20 15:00:15 -0700643
644 return ret;
645}
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400646
Mingkai Hub36ece82010-10-12 18:18:31 +0800647static void *fsl_spi_alloc_dummy_rx(void)
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700648{
Mingkai Hub36ece82010-10-12 18:18:31 +0800649 mutex_lock(&fsl_dummy_rx_lock);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700650
Mingkai Hub36ece82010-10-12 18:18:31 +0800651 if (!fsl_dummy_rx)
652 fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL);
653 if (fsl_dummy_rx)
654 fsl_dummy_rx_refcnt++;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700655
Mingkai Hub36ece82010-10-12 18:18:31 +0800656 mutex_unlock(&fsl_dummy_rx_lock);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700657
Mingkai Hub36ece82010-10-12 18:18:31 +0800658 return fsl_dummy_rx;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700659}
660
Mingkai Hub36ece82010-10-12 18:18:31 +0800661static void fsl_spi_free_dummy_rx(void)
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700662{
Mingkai Hub36ece82010-10-12 18:18:31 +0800663 mutex_lock(&fsl_dummy_rx_lock);
Kumar Galaccf06992006-05-20 15:00:15 -0700664
Mingkai Hub36ece82010-10-12 18:18:31 +0800665 switch (fsl_dummy_rx_refcnt) {
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400666 case 0:
667 WARN_ON(1);
668 break;
669 case 1:
Mingkai Hub36ece82010-10-12 18:18:31 +0800670 kfree(fsl_dummy_rx);
671 fsl_dummy_rx = NULL;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400672 /* fall through */
673 default:
Mingkai Hub36ece82010-10-12 18:18:31 +0800674 fsl_dummy_rx_refcnt--;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400675 break;
676 }
677
Mingkai Hub36ece82010-10-12 18:18:31 +0800678 mutex_unlock(&fsl_dummy_rx_lock);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400679}
680
Mingkai Hub36ece82010-10-12 18:18:31 +0800681static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400682{
683 struct device *dev = mspi->dev;
Grant Likely61c7a082010-04-13 16:12:29 -0700684 struct device_node *np = dev->of_node;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400685 const u32 *iprop;
686 int size;
687 unsigned long spi_base_ofs;
688 unsigned long pram_ofs = -ENOMEM;
689
690 /* Can't use of_address_to_resource(), QE muram isn't at 0. */
691 iprop = of_get_property(np, "reg", &size);
692
693 /* QE with a fixed pram location? */
694 if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4)
695 return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE);
696
697 /* QE but with a dynamic pram location? */
698 if (mspi->flags & SPI_QE) {
699 pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
700 qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock,
701 QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs);
702 return pram_ofs;
703 }
704
705 /* CPM1 and CPM2 pram must be at a fixed addr. */
706 if (!iprop || size != sizeof(*iprop) * 4)
707 return -ENOMEM;
708
709 spi_base_ofs = cpm_muram_alloc_fixed(iprop[2], 2);
710 if (IS_ERR_VALUE(spi_base_ofs))
711 return -ENOMEM;
712
713 if (mspi->flags & SPI_CPM2) {
714 pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
715 if (!IS_ERR_VALUE(pram_ofs)) {
716 u16 __iomem *spi_base = cpm_muram_addr(spi_base_ofs);
717
718 out_be16(spi_base, pram_ofs);
719 }
720 } else {
721 struct spi_pram __iomem *pram = cpm_muram_addr(spi_base_ofs);
722 u16 rpbase = in_be16(&pram->rpbase);
723
724 /* Microcode relocation patch applied? */
725 if (rpbase)
726 pram_ofs = rpbase;
727 else
728 return spi_base_ofs;
729 }
730
731 cpm_muram_free(spi_base_ofs);
732 return pram_ofs;
733}
734
Mingkai Hub36ece82010-10-12 18:18:31 +0800735static int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400736{
737 struct device *dev = mspi->dev;
Grant Likely61c7a082010-04-13 16:12:29 -0700738 struct device_node *np = dev->of_node;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400739 const u32 *iprop;
740 int size;
741 unsigned long pram_ofs;
742 unsigned long bds_ofs;
743
744 if (!(mspi->flags & SPI_CPM_MODE))
745 return 0;
746
Mingkai Hub36ece82010-10-12 18:18:31 +0800747 if (!fsl_spi_alloc_dummy_rx())
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400748 return -ENOMEM;
749
750 if (mspi->flags & SPI_QE) {
751 iprop = of_get_property(np, "cell-index", &size);
752 if (iprop && size == sizeof(*iprop))
753 mspi->subblock = *iprop;
754
755 switch (mspi->subblock) {
756 default:
757 dev_warn(dev, "cell-index unspecified, assuming SPI1");
758 /* fall through */
759 case 0:
760 mspi->subblock = QE_CR_SUBBLOCK_SPI1;
761 break;
762 case 1:
763 mspi->subblock = QE_CR_SUBBLOCK_SPI2;
764 break;
765 }
766 }
767
Mingkai Hub36ece82010-10-12 18:18:31 +0800768 pram_ofs = fsl_spi_cpm_get_pram(mspi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400769 if (IS_ERR_VALUE(pram_ofs)) {
770 dev_err(dev, "can't allocate spi parameter ram\n");
771 goto err_pram;
772 }
773
774 bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) +
775 sizeof(*mspi->rx_bd), 8);
776 if (IS_ERR_VALUE(bds_ofs)) {
777 dev_err(dev, "can't allocate bds\n");
778 goto err_bds;
779 }
780
781 mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE,
782 DMA_TO_DEVICE);
783 if (dma_mapping_error(dev, mspi->dma_dummy_tx)) {
784 dev_err(dev, "unable to map dummy tx buffer\n");
785 goto err_dummy_tx;
786 }
787
Mingkai Hub36ece82010-10-12 18:18:31 +0800788 mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR,
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400789 DMA_FROM_DEVICE);
790 if (dma_mapping_error(dev, mspi->dma_dummy_rx)) {
791 dev_err(dev, "unable to map dummy rx buffer\n");
792 goto err_dummy_rx;
793 }
794
795 mspi->pram = cpm_muram_addr(pram_ofs);
796
797 mspi->tx_bd = cpm_muram_addr(bds_ofs);
798 mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));
799
800 /* Initialize parameter ram. */
801 out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd));
802 out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd));
803 out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL);
804 out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL);
805 out_be16(&mspi->pram->mrblr, SPI_MRBLR);
806 out_be32(&mspi->pram->rstate, 0);
807 out_be32(&mspi->pram->rdp, 0);
808 out_be16(&mspi->pram->rbptr, 0);
809 out_be16(&mspi->pram->rbc, 0);
810 out_be32(&mspi->pram->rxtmp, 0);
811 out_be32(&mspi->pram->tstate, 0);
812 out_be32(&mspi->pram->tdp, 0);
813 out_be16(&mspi->pram->tbptr, 0);
814 out_be16(&mspi->pram->tbc, 0);
815 out_be32(&mspi->pram->txtmp, 0);
816
817 return 0;
818
819err_dummy_rx:
820 dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
821err_dummy_tx:
822 cpm_muram_free(bds_ofs);
823err_bds:
824 cpm_muram_free(pram_ofs);
825err_pram:
Mingkai Hub36ece82010-10-12 18:18:31 +0800826 fsl_spi_free_dummy_rx();
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400827 return -ENOMEM;
828}
829
Mingkai Hub36ece82010-10-12 18:18:31 +0800830static void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi)
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400831{
832 struct device *dev = mspi->dev;
833
834 dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
835 dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
836 cpm_muram_free(cpm_muram_offset(mspi->tx_bd));
837 cpm_muram_free(cpm_muram_offset(mspi->pram));
Mingkai Hub36ece82010-10-12 18:18:31 +0800838 fsl_spi_free_dummy_rx();
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400839}
840
Mingkai Hub36ece82010-10-12 18:18:31 +0800841static void fsl_spi_remove(struct mpc8xxx_spi *mspi)
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400842{
Mingkai Hub36ece82010-10-12 18:18:31 +0800843 iounmap(mspi->reg_base);
844 fsl_spi_cpm_free(mspi);
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400845}
846
Mingkai Hub36ece82010-10-12 18:18:31 +0800847static struct spi_master * __devinit fsl_spi_probe(struct device *dev,
848 struct resource *mem, unsigned int irq)
Kumar Galaccf06992006-05-20 15:00:15 -0700849{
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700850 struct fsl_spi_platform_data *pdata = dev->platform_data;
Kumar Galaccf06992006-05-20 15:00:15 -0700851 struct spi_master *master;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700852 struct mpc8xxx_spi *mpc8xxx_spi;
Mingkai Hub36ece82010-10-12 18:18:31 +0800853 struct fsl_spi_reg *reg_base;
Kumar Galaccf06992006-05-20 15:00:15 -0700854 u32 regval;
855 int ret = 0;
856
Anton Vorontsov575c5802009-06-18 16:49:08 -0700857 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
Kumar Galaccf06992006-05-20 15:00:15 -0700858 if (master == NULL) {
859 ret = -ENOMEM;
860 goto err;
861 }
862
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700863 dev_set_drvdata(dev, master);
Kumar Galaccf06992006-05-20 15:00:15 -0700864
Mingkai Hub36ece82010-10-12 18:18:31 +0800865 ret = mpc8xxx_spi_probe(dev, mem, irq);
866 if (ret)
867 goto err_probe;
David Brownelle7db06b2009-06-17 16:26:04 -0700868
Mingkai Hub36ece82010-10-12 18:18:31 +0800869 master->setup = fsl_spi_setup;
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700870
Anton Vorontsov575c5802009-06-18 16:49:08 -0700871 mpc8xxx_spi = spi_master_get_devdata(master);
Mingkai Hub36ece82010-10-12 18:18:31 +0800872 mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
873 mpc8xxx_spi->spi_remove = fsl_spi_remove;
Anton Vorontsove24a4d12007-08-10 13:01:01 -0700874
Mingkai Hub36ece82010-10-12 18:18:31 +0800875
876 ret = fsl_spi_cpm_init(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400877 if (ret)
878 goto err_cpm_init;
879
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400880 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
Anton Vorontsov575c5802009-06-18 16:49:08 -0700881 mpc8xxx_spi->rx_shift = 16;
882 mpc8xxx_spi->tx_shift = 24;
Joakim Tjernlundf29ba282007-07-17 04:04:12 -0700883 }
884
Mingkai Hub36ece82010-10-12 18:18:31 +0800885 mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
886 if (mpc8xxx_spi->reg_base == NULL) {
Kumar Galaccf06992006-05-20 15:00:15 -0700887 ret = -ENOMEM;
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400888 goto err_ioremap;
Kumar Galaccf06992006-05-20 15:00:15 -0700889 }
890
Kumar Galaccf06992006-05-20 15:00:15 -0700891 /* Register for SPI Interrupt */
Mingkai Hub36ece82010-10-12 18:18:31 +0800892 ret = request_irq(mpc8xxx_spi->irq, fsl_spi_irq,
893 0, "fsl_spi", mpc8xxx_spi);
Kumar Galaccf06992006-05-20 15:00:15 -0700894
895 if (ret != 0)
Mingkai Hub36ece82010-10-12 18:18:31 +0800896 goto free_irq;
Kumar Galaccf06992006-05-20 15:00:15 -0700897
Mingkai Hub36ece82010-10-12 18:18:31 +0800898 reg_base = mpc8xxx_spi->reg_base;
Kumar Galaccf06992006-05-20 15:00:15 -0700899
900 /* SPI controller initializations */
Mingkai Hub36ece82010-10-12 18:18:31 +0800901 mpc8xxx_spi_write_reg(&reg_base->mode, 0);
902 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
903 mpc8xxx_spi_write_reg(&reg_base->command, 0);
904 mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
Kumar Galaccf06992006-05-20 15:00:15 -0700905
906 /* Enable SPI interface */
907 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400908 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
Joakim Tjernlundf29ba282007-07-17 04:04:12 -0700909 regval |= SPMODE_OP;
910
Mingkai Hub36ece82010-10-12 18:18:31 +0800911 mpc8xxx_spi_write_reg(&reg_base->mode, regval);
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700912
913 ret = spi_register_master(master);
914 if (ret < 0)
915 goto unreg_master;
Kumar Galaccf06992006-05-20 15:00:15 -0700916
Mingkai Hub36ece82010-10-12 18:18:31 +0800917 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
Anton Vorontsov87ec0e92009-10-12 20:49:25 +0400918 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
Kumar Galaccf06992006-05-20 15:00:15 -0700919
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700920 return master;
Kumar Galaccf06992006-05-20 15:00:15 -0700921
Joakim Tjernlundc9bfcb32008-05-12 14:02:30 -0700922unreg_master:
Anton Vorontsov575c5802009-06-18 16:49:08 -0700923 free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
Mingkai Hub36ece82010-10-12 18:18:31 +0800924free_irq:
925 iounmap(mpc8xxx_spi->reg_base);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400926err_ioremap:
Mingkai Hub36ece82010-10-12 18:18:31 +0800927 fsl_spi_cpm_free(mpc8xxx_spi);
Anton Vorontsov4c1fba42009-10-12 20:49:27 +0400928err_cpm_init:
Mingkai Hub36ece82010-10-12 18:18:31 +0800929err_probe:
Kumar Galaccf06992006-05-20 15:00:15 -0700930 spi_master_put(master);
Kumar Galaccf06992006-05-20 15:00:15 -0700931err:
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700932 return ERR_PTR(ret);
Kumar Galaccf06992006-05-20 15:00:15 -0700933}
934
Mingkai Hub36ece82010-10-12 18:18:31 +0800935static void fsl_spi_cs_control(struct spi_device *spi, bool on)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700936{
937 struct device *dev = spi->dev.parent;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700938 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700939 u16 cs = spi->chip_select;
940 int gpio = pinfo->gpios[cs];
941 bool alow = pinfo->alow_flags[cs];
942
943 gpio_set_value(gpio, on ^ alow);
944}
945
Mingkai Hub36ece82010-10-12 18:18:31 +0800946static int of_fsl_spi_get_chipselects(struct device *dev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700947{
Grant Likely61c7a082010-04-13 16:12:29 -0700948 struct device_node *np = dev->of_node;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700949 struct fsl_spi_platform_data *pdata = dev->platform_data;
Anton Vorontsov575c5802009-06-18 16:49:08 -0700950 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700951 unsigned int ngpios;
952 int i = 0;
953 int ret;
954
955 ngpios = of_gpio_count(np);
956 if (!ngpios) {
957 /*
958 * SPI w/o chip-select line. One SPI device is still permitted
959 * though.
960 */
961 pdata->max_chipselect = 1;
962 return 0;
963 }
964
Roel Kluin02141542009-06-16 15:31:15 -0700965 pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700966 if (!pinfo->gpios)
967 return -ENOMEM;
Roel Kluin02141542009-06-16 15:31:15 -0700968 memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios));
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700969
Roel Kluin02141542009-06-16 15:31:15 -0700970 pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags),
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700971 GFP_KERNEL);
972 if (!pinfo->alow_flags) {
973 ret = -ENOMEM;
974 goto err_alloc_flags;
975 }
976
977 for (; i < ngpios; i++) {
978 int gpio;
979 enum of_gpio_flags flags;
980
981 gpio = of_get_gpio_flags(np, i, &flags);
982 if (!gpio_is_valid(gpio)) {
983 dev_err(dev, "invalid gpio #%d: %d\n", i, gpio);
Anton Vorontsov783058f2009-10-12 20:49:22 +0400984 ret = gpio;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -0700985 goto err_loop;
986 }
987
988 ret = gpio_request(gpio, dev_name(dev));
989 if (ret) {
990 dev_err(dev, "can't request gpio #%d: %d\n", i, ret);
991 goto err_loop;
992 }
993
994 pinfo->gpios[i] = gpio;
995 pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW;
996
997 ret = gpio_direction_output(pinfo->gpios[i],
998 pinfo->alow_flags[i]);
999 if (ret) {
1000 dev_err(dev, "can't set output direction for gpio "
1001 "#%d: %d\n", i, ret);
1002 goto err_loop;
1003 }
1004 }
1005
1006 pdata->max_chipselect = ngpios;
Mingkai Hub36ece82010-10-12 18:18:31 +08001007 pdata->cs_control = fsl_spi_cs_control;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001008
1009 return 0;
1010
1011err_loop:
1012 while (i >= 0) {
1013 if (gpio_is_valid(pinfo->gpios[i]))
1014 gpio_free(pinfo->gpios[i]);
1015 i--;
1016 }
1017
1018 kfree(pinfo->alow_flags);
1019 pinfo->alow_flags = NULL;
1020err_alloc_flags:
1021 kfree(pinfo->gpios);
1022 pinfo->gpios = NULL;
1023 return ret;
1024}
1025
Mingkai Hub36ece82010-10-12 18:18:31 +08001026static int of_fsl_spi_free_chipselects(struct device *dev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001027{
1028 struct fsl_spi_platform_data *pdata = dev->platform_data;
Anton Vorontsov575c5802009-06-18 16:49:08 -07001029 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001030 int i;
1031
1032 if (!pinfo->gpios)
1033 return 0;
1034
1035 for (i = 0; i < pdata->max_chipselect; i++) {
1036 if (gpio_is_valid(pinfo->gpios[i]))
1037 gpio_free(pinfo->gpios[i]);
1038 }
1039
1040 kfree(pinfo->gpios);
1041 kfree(pinfo->alow_flags);
1042 return 0;
1043}
1044
Mingkai Hub36ece82010-10-12 18:18:31 +08001045static int __devinit of_fsl_spi_probe(struct platform_device *ofdev,
1046 const struct of_device_id *ofid)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001047{
1048 struct device *dev = &ofdev->dev;
Grant Likely61c7a082010-04-13 16:12:29 -07001049 struct device_node *np = ofdev->dev.of_node;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001050 struct spi_master *master;
1051 struct resource mem;
1052 struct resource irq;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001053 int ret = -ENOMEM;
1054
Mingkai Hub36ece82010-10-12 18:18:31 +08001055 ret = of_mpc8xxx_spi_probe(ofdev, ofid);
1056 if (ret)
1057 return ret;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001058
Mingkai Hub36ece82010-10-12 18:18:31 +08001059 ret = of_fsl_spi_get_chipselects(dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001060 if (ret)
1061 goto err;
1062
1063 ret = of_address_to_resource(np, 0, &mem);
1064 if (ret)
1065 goto err;
1066
1067 ret = of_irq_to_resource(np, 0, &irq);
1068 if (!ret) {
1069 ret = -EINVAL;
1070 goto err;
1071 }
1072
Mingkai Hub36ece82010-10-12 18:18:31 +08001073 master = fsl_spi_probe(dev, &mem, irq.start);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001074 if (IS_ERR(master)) {
1075 ret = PTR_ERR(master);
1076 goto err;
1077 }
1078
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001079 return 0;
1080
1081err:
Mingkai Hub36ece82010-10-12 18:18:31 +08001082 of_fsl_spi_free_chipselects(dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001083 return ret;
1084}
1085
Mingkai Hub36ece82010-10-12 18:18:31 +08001086static int __devexit of_fsl_spi_remove(struct platform_device *ofdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001087{
1088 int ret;
1089
Anton Vorontsov575c5802009-06-18 16:49:08 -07001090 ret = mpc8xxx_spi_remove(&ofdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001091 if (ret)
1092 return ret;
Mingkai Hub36ece82010-10-12 18:18:31 +08001093 of_fsl_spi_free_chipselects(&ofdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001094 return 0;
1095}
1096
Mingkai Hub36ece82010-10-12 18:18:31 +08001097static const struct of_device_id of_fsl_spi_match[] = {
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001098 { .compatible = "fsl,spi" },
Mingkai Hub36ece82010-10-12 18:18:31 +08001099 {}
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001100};
Mingkai Hub36ece82010-10-12 18:18:31 +08001101MODULE_DEVICE_TABLE(of, of_fsl_spi_match);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001102
Mingkai Hub36ece82010-10-12 18:18:31 +08001103static struct of_platform_driver of_fsl_spi_driver = {
Grant Likely40182942010-04-13 16:13:02 -07001104 .driver = {
Mingkai Hub36ece82010-10-12 18:18:31 +08001105 .name = "fsl_spi",
Grant Likely40182942010-04-13 16:13:02 -07001106 .owner = THIS_MODULE,
Mingkai Hub36ece82010-10-12 18:18:31 +08001107 .of_match_table = of_fsl_spi_match,
Grant Likely40182942010-04-13 16:13:02 -07001108 },
Mingkai Hub36ece82010-10-12 18:18:31 +08001109 .probe = of_fsl_spi_probe,
1110 .remove = __devexit_p(of_fsl_spi_remove),
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001111};
1112
1113#ifdef CONFIG_MPC832x_RDB
1114/*
Mingkai Hub36ece82010-10-12 18:18:31 +08001115 * XXX XXX XXX
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001116 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
1117 * only. The driver should go away soon, since newer MPC8323E-RDB's device
1118 * tree can work with OpenFirmware driver. But for now we support old trees
1119 * as well.
1120 */
Anton Vorontsov575c5802009-06-18 16:49:08 -07001121static int __devinit plat_mpc8xxx_spi_probe(struct platform_device *pdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001122{
1123 struct resource *mem;
Uwe Kleine-Könige9a172f2010-01-20 13:49:44 -07001124 int irq;
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001125 struct spi_master *master;
1126
1127 if (!pdev->dev.platform_data)
1128 return -EINVAL;
1129
1130 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1131 if (!mem)
1132 return -EINVAL;
1133
1134 irq = platform_get_irq(pdev, 0);
Uwe Kleine-Könige9a172f2010-01-20 13:49:44 -07001135 if (irq <= 0)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001136 return -EINVAL;
1137
Mingkai Hub36ece82010-10-12 18:18:31 +08001138 master = fsl_spi_probe(&pdev->dev, mem, irq);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001139 if (IS_ERR(master))
1140 return PTR_ERR(master);
1141 return 0;
1142}
1143
Anton Vorontsov575c5802009-06-18 16:49:08 -07001144static int __devexit plat_mpc8xxx_spi_remove(struct platform_device *pdev)
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001145{
Anton Vorontsov575c5802009-06-18 16:49:08 -07001146 return mpc8xxx_spi_remove(&pdev->dev);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001147}
1148
Anton Vorontsov575c5802009-06-18 16:49:08 -07001149MODULE_ALIAS("platform:mpc8xxx_spi");
1150static struct platform_driver mpc8xxx_spi_driver = {
1151 .probe = plat_mpc8xxx_spi_probe,
Uwe Kleine-Königb3a08942009-11-24 21:07:27 +00001152 .remove = __devexit_p(plat_mpc8xxx_spi_remove),
Kumar Galaccf06992006-05-20 15:00:15 -07001153 .driver = {
Anton Vorontsov575c5802009-06-18 16:49:08 -07001154 .name = "mpc8xxx_spi",
Kay Sievers7e38c3c2008-04-10 21:29:20 -07001155 .owner = THIS_MODULE,
Kumar Galaccf06992006-05-20 15:00:15 -07001156 },
1157};
1158
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001159static bool legacy_driver_failed;
1160
1161static void __init legacy_driver_register(void)
1162{
Anton Vorontsov575c5802009-06-18 16:49:08 -07001163 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001164}
1165
1166static void __exit legacy_driver_unregister(void)
1167{
1168 if (legacy_driver_failed)
1169 return;
Anton Vorontsov575c5802009-06-18 16:49:08 -07001170 platform_driver_unregister(&mpc8xxx_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001171}
1172#else
1173static void __init legacy_driver_register(void) {}
1174static void __exit legacy_driver_unregister(void) {}
1175#endif /* CONFIG_MPC832x_RDB */
1176
Mingkai Hub36ece82010-10-12 18:18:31 +08001177static int __init fsl_spi_init(void)
Kumar Galaccf06992006-05-20 15:00:15 -07001178{
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001179 legacy_driver_register();
Mingkai Hub36ece82010-10-12 18:18:31 +08001180 return of_register_platform_driver(&of_fsl_spi_driver);
Kumar Galaccf06992006-05-20 15:00:15 -07001181}
Mingkai Hub36ece82010-10-12 18:18:31 +08001182module_init(fsl_spi_init);
Kumar Galaccf06992006-05-20 15:00:15 -07001183
Mingkai Hub36ece82010-10-12 18:18:31 +08001184static void __exit fsl_spi_exit(void)
Kumar Galaccf06992006-05-20 15:00:15 -07001185{
Mingkai Hub36ece82010-10-12 18:18:31 +08001186 of_unregister_platform_driver(&of_fsl_spi_driver);
Anton Vorontsov35b4b3c2009-03-31 15:24:37 -07001187 legacy_driver_unregister();
Kumar Galaccf06992006-05-20 15:00:15 -07001188}
Mingkai Hub36ece82010-10-12 18:18:31 +08001189module_exit(fsl_spi_exit);
Kumar Galaccf06992006-05-20 15:00:15 -07001190
1191MODULE_AUTHOR("Kumar Gala");
Mingkai Hub36ece82010-10-12 18:18:31 +08001192MODULE_DESCRIPTION("Simple Freescale SPI Driver");
Kumar Galaccf06992006-05-20 15:00:15 -07001193MODULE_LICENSE("GPL");