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authorFeng Tang <feng.tang@intel.com>2009-12-14 17:20:22 -0500
committerGrant Likely <grant.likely@secretlab.ca>2009-12-17 10:39:13 -0500
commite24c745272072fd2abe55209f1949b7b7ee602a7 (patch)
tree5f9db63ad5aafd57587dd9ebf62afa33eb65a095
parentdb389b6143c895d23060179b14928f63d44285a2 (diff)
spi: controller driver for Designware SPI core
Driver for the Designware SPI core, it supports multipul interfaces like PCI/APB etc. User can use "dw_apb_ssi_db.pdf" from Synopsys as HW datasheet. [randy.dunlap@oracle.com: fix build] [akpm@linux-foundation.org: build fix] Signed-off-by: Feng Tang <feng.tang@intel.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat
-rw-r--r--drivers/spi/Kconfig10
-rw-r--r--drivers/spi/Makefile2
-rw-r--r--drivers/spi/dw_spi.c944
-rw-r--r--drivers/spi/dw_spi_pci.c169
-rw-r--r--include/linux/spi/dw_spi.h212
5 files changed, 1337 insertions, 0 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 07e5453f7b18..d7c1741c4c5b 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -292,6 +292,16 @@ config SPI_NUC900
292# Add new SPI master controllers in alphabetical order above this line 292# Add new SPI master controllers in alphabetical order above this line
293# 293#
294 294
295config SPI_DESIGNWARE
296 bool "DesignWare SPI controller core support"
297 depends on SPI_MASTER
298 help
299 general driver for SPI controller core from DesignWare
300
301config SPI_DW_PCI
302 tristate "PCI interface driver for DW SPI core"
303 depends on SPI_DESIGNWARE && PCI
304
295# 305#
296# There are lots of SPI device types, with sensors and memory 306# There are lots of SPI device types, with sensors and memory
297# being probably the most widely used ones. 307# being probably the most widely used ones.
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index ed8c1675b52f..a909e39f7e7c 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -16,6 +16,8 @@ obj-$(CONFIG_SPI_BFIN) += spi_bfin5xx.o
16obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o 16obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o
17obj-$(CONFIG_SPI_AU1550) += au1550_spi.o 17obj-$(CONFIG_SPI_AU1550) += au1550_spi.o
18obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o 18obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o
19obj-$(CONFIG_SPI_DESIGNWARE) += dw_spi.o
20obj-$(CONFIG_SPI_DW_PCI) += dw_spi_pci.o
19obj-$(CONFIG_SPI_GPIO) += spi_gpio.o 21obj-$(CONFIG_SPI_GPIO) += spi_gpio.o
20obj-$(CONFIG_SPI_IMX) += spi_imx.o 22obj-$(CONFIG_SPI_IMX) += spi_imx.o
21obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o 23obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o
diff --git a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c
new file mode 100644
index 000000000000..31620fae77be
--- /dev/null
+++ b/drivers/spi/dw_spi.c
@@ -0,0 +1,944 @@
1/*
2 * dw_spi.c - Designware SPI core controller driver (refer pxa2xx_spi.c)
3 *
4 * Copyright (c) 2009, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20#include <linux/dma-mapping.h>
21#include <linux/interrupt.h>
22#include <linux/highmem.h>
23#include <linux/delay.h>
24
25#include <linux/spi/dw_spi.h>
26#include <linux/spi/spi.h>
27
28#ifdef CONFIG_DEBUG_FS
29#include <linux/debugfs.h>
30#endif
31
32#define START_STATE ((void *)0)
33#define RUNNING_STATE ((void *)1)
34#define DONE_STATE ((void *)2)
35#define ERROR_STATE ((void *)-1)
36
37#define QUEUE_RUNNING 0
38#define QUEUE_STOPPED 1
39
40#define MRST_SPI_DEASSERT 0
41#define MRST_SPI_ASSERT 1
42
43/* Slave spi_dev related */
44struct chip_data {
45 u16 cr0;
46 u8 cs; /* chip select pin */
47 u8 n_bytes; /* current is a 1/2/4 byte op */
48 u8 tmode; /* TR/TO/RO/EEPROM */
49 u8 type; /* SPI/SSP/MicroWire */
50
51 u8 poll_mode; /* 1 means use poll mode */
52
53 u32 dma_width;
54 u32 rx_threshold;
55 u32 tx_threshold;
56 u8 enable_dma;
57 u8 bits_per_word;
58 u16 clk_div; /* baud rate divider */
59 u32 speed_hz; /* baud rate */
60 int (*write)(struct dw_spi *dws);
61 int (*read)(struct dw_spi *dws);
62 void (*cs_control)(u32 command);
63};
64
65#ifdef CONFIG_DEBUG_FS
66static int spi_show_regs_open(struct inode *inode, struct file *file)
67{
68 file->private_data = inode->i_private;
69 return 0;
70}
71
72#define SPI_REGS_BUFSIZE 1024
73static ssize_t spi_show_regs(struct file *file, char __user *user_buf,
74 size_t count, loff_t *ppos)
75{
76 struct dw_spi *dws;
77 char *buf;
78 u32 len = 0;
79 ssize_t ret;
80
81 dws = file->private_data;
82
83 buf = kzalloc(SPI_REGS_BUFSIZE, GFP_KERNEL);
84 if (!buf)
85 return 0;
86
87 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
88 "MRST SPI0 registers:\n");
89 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
90 "=================================\n");
91 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
92 "CTRL0: \t\t0x%08x\n", dw_readl(dws, ctrl0));
93 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
94 "CTRL1: \t\t0x%08x\n", dw_readl(dws, ctrl1));
95 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
96 "SSIENR: \t0x%08x\n", dw_readl(dws, ssienr));
97 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
98 "SER: \t\t0x%08x\n", dw_readl(dws, ser));
99 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
100 "BAUDR: \t\t0x%08x\n", dw_readl(dws, baudr));
101 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
102 "TXFTLR: \t0x%08x\n", dw_readl(dws, txfltr));
103 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
104 "RXFTLR: \t0x%08x\n", dw_readl(dws, rxfltr));
105 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
106 "TXFLR: \t\t0x%08x\n", dw_readl(dws, txflr));
107 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
108 "RXFLR: \t\t0x%08x\n", dw_readl(dws, rxflr));
109 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
110 "SR: \t\t0x%08x\n", dw_readl(dws, sr));
111 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
112 "IMR: \t\t0x%08x\n", dw_readl(dws, imr));
113 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
114 "ISR: \t\t0x%08x\n", dw_readl(dws, isr));
115 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
116 "DMACR: \t\t0x%08x\n", dw_readl(dws, dmacr));
117 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
118 "DMATDLR: \t0x%08x\n", dw_readl(dws, dmatdlr));
119 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
120 "DMARDLR: \t0x%08x\n", dw_readl(dws, dmardlr));
121 len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
122 "=================================\n");
123
124 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
125 kfree(buf);
126 return ret;
127}
128
129static const struct file_operations mrst_spi_regs_ops = {
130 .owner = THIS_MODULE,
131 .open = spi_show_regs_open,
132 .read = spi_show_regs,
133};
134
135static int mrst_spi_debugfs_init(struct dw_spi *dws)
136{
137 dws->debugfs = debugfs_create_dir("mrst_spi", NULL);
138 if (!dws->debugfs)
139 return -ENOMEM;
140
141 debugfs_create_file("registers", S_IFREG | S_IRUGO,
142 dws->debugfs, (void *)dws, &mrst_spi_regs_ops);
143 return 0;
144}
145
146static void mrst_spi_debugfs_remove(struct dw_spi *dws)
147{
148 if (dws->debugfs)
149 debugfs_remove_recursive(dws->debugfs);
150}
151
152#else
153static inline int mrst_spi_debugfs_init(struct dw_spi *dws)
154{
155}
156
157static inline void mrst_spi_debugfs_remove(struct dw_spi *dws)
158{
159}
160#endif /* CONFIG_DEBUG_FS */
161
162static void wait_till_not_busy(struct dw_spi *dws)
163{
164 unsigned long end = jiffies + usecs_to_jiffies(1000);
165
166 while (time_before(jiffies, end)) {
167 if (!(dw_readw(dws, sr) & SR_BUSY))
168 return;
169 }
170 dev_err(&dws->master->dev,
171 "DW SPI: Stutus keeps busy for 1000us after a read/write!\n");
172}
173
174static void flush(struct dw_spi *dws)
175{
176 while (dw_readw(dws, sr) & SR_RF_NOT_EMPT)
177 dw_readw(dws, dr);
178
179 wait_till_not_busy(dws);
180}
181
182static void null_cs_control(u32 command)
183{
184}
185
186static int null_writer(struct dw_spi *dws)
187{
188 u8 n_bytes = dws->n_bytes;
189
190 if (!(dw_readw(dws, sr) & SR_TF_NOT_FULL)
191 || (dws->tx == dws->tx_end))
192 return 0;
193 dw_writew(dws, dr, 0);
194 dws->tx += n_bytes;
195
196 wait_till_not_busy(dws);
197 return 1;
198}
199
200static int null_reader(struct dw_spi *dws)
201{
202 u8 n_bytes = dws->n_bytes;
203
204 while ((dw_readw(dws, sr) & SR_RF_NOT_EMPT)
205 && (dws->rx < dws->rx_end)) {
206 dw_readw(dws, dr);
207 dws->rx += n_bytes;
208 }
209 wait_till_not_busy(dws);
210 return dws->rx == dws->rx_end;
211}
212
213static int u8_writer(struct dw_spi *dws)
214{
215 if (!(dw_readw(dws, sr) & SR_TF_NOT_FULL)
216 || (dws->tx == dws->tx_end))
217 return 0;
218
219 dw_writew(dws, dr, *(u8 *)(dws->tx));
220 ++dws->tx;
221
222 wait_till_not_busy(dws);
223 return 1;
224}
225
226static int u8_reader(struct dw_spi *dws)
227{
228 while ((dw_readw(dws, sr) & SR_RF_NOT_EMPT)
229 && (dws->rx < dws->rx_end)) {
230 *(u8 *)(dws->rx) = dw_readw(dws, dr);
231 ++dws->rx;
232 }
233
234 wait_till_not_busy(dws);
235 return dws->rx == dws->rx_end;
236}
237
238static int u16_writer(struct dw_spi *dws)
239{
240 if (!(dw_readw(dws, sr) & SR_TF_NOT_FULL)
241 || (dws->tx == dws->tx_end))
242 return 0;
243
244 dw_writew(dws, dr, *(u16 *)(dws->tx));
245 dws->tx += 2;
246
247 wait_till_not_busy(dws);
248 return 1;
249}
250
251static int u16_reader(struct dw_spi *dws)
252{
253 u16 temp;
254
255 while ((dw_readw(dws, sr) & SR_RF_NOT_EMPT)
256 && (dws->rx < dws->rx_end)) {
257 temp = dw_readw(dws, dr);
258 *(u16 *)(dws->rx) = temp;
259 dws->rx += 2;
260 }
261
262 wait_till_not_busy(dws);
263 return dws->rx == dws->rx_end;
264}
265
266static void *next_transfer(struct dw_spi *dws)
267{
268 struct spi_message *msg = dws->cur_msg;
269 struct spi_transfer *trans = dws->cur_transfer;
270
271 /* Move to next transfer */
272 if (trans->transfer_list.next != &msg->transfers) {
273 dws->cur_transfer =
274 list_entry(trans->transfer_list.next,
275 struct spi_transfer,
276 transfer_list);
277 return RUNNING_STATE;
278 } else
279 return DONE_STATE;
280}
281
282/*
283 * Note: first step is the protocol driver prepares
284 * a dma-capable memory, and this func just need translate
285 * the virt addr to physical
286 */
287static int map_dma_buffers(struct dw_spi *dws)
288{
289 if (!dws->cur_msg->is_dma_mapped || !dws->dma_inited
290 || !dws->cur_chip->enable_dma)
291 return 0;
292
293 if (dws->cur_transfer->tx_dma)
294 dws->tx_dma = dws->cur_transfer->tx_dma;
295
296 if (dws->cur_transfer->rx_dma)
297 dws->rx_dma = dws->cur_transfer->rx_dma;
298
299 return 1;
300}
301
302/* Caller already set message->status; dma and pio irqs are blocked */
303static void giveback(struct dw_spi *dws)
304{
305 struct spi_transfer *last_transfer;
306 unsigned long flags;
307 struct spi_message *msg;
308
309 spin_lock_irqsave(&dws->lock, flags);
310 msg = dws->cur_msg;
311 dws->cur_msg = NULL;
312 dws->cur_transfer = NULL;
313 dws->prev_chip = dws->cur_chip;
314 dws->cur_chip = NULL;
315 dws->dma_mapped = 0;
316 queue_work(dws->workqueue, &dws->pump_messages);
317 spin_unlock_irqrestore(&dws->lock, flags);
318
319 last_transfer = list_entry(msg->transfers.prev,
320 struct spi_transfer,
321 transfer_list);
322
323 if (!last_transfer->cs_change)
324 dws->cs_control(MRST_SPI_DEASSERT);
325
326 msg->state = NULL;
327 if (msg->complete)
328 msg->complete(msg->context);
329}
330
331static void int_error_stop(struct dw_spi *dws, const char *msg)
332{
333 /* Stop and reset hw */
334 flush(dws);
335 spi_enable_chip(dws, 0);
336
337 dev_err(&dws->master->dev, "%s\n", msg);
338 dws->cur_msg->state = ERROR_STATE;
339 tasklet_schedule(&dws->pump_transfers);
340}
341
342static void transfer_complete(struct dw_spi *dws)
343{
344 /* Update total byte transfered return count actual bytes read */
345 dws->cur_msg->actual_length += dws->len;
346
347 /* Move to next transfer */
348 dws->cur_msg->state = next_transfer(dws);
349
350 /* Handle end of message */
351 if (dws->cur_msg->state == DONE_STATE) {
352 dws->cur_msg->status = 0;
353 giveback(dws);
354 } else
355 tasklet_schedule(&dws->pump_transfers);
356}
357
358static irqreturn_t interrupt_transfer(struct dw_spi *dws)
359{
360 u16 irq_status, irq_mask = 0x3f;
361
362 irq_status = dw_readw(dws, isr) & irq_mask;
363 /* Error handling */
364 if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) {
365 dw_readw(dws, txoicr);
366 dw_readw(dws, rxoicr);
367 dw_readw(dws, rxuicr);
368 int_error_stop(dws, "interrupt_transfer: fifo overrun");
369 return IRQ_HANDLED;
370 }
371
372 /* INT comes from tx */
373 if (dws->tx && (irq_status & SPI_INT_TXEI)) {
374 while (dws->tx < dws->tx_end)
375 dws->write(dws);
376
377 if (dws->tx == dws->tx_end) {
378 spi_mask_intr(dws, SPI_INT_TXEI);
379 transfer_complete(dws);
380 }
381 }
382
383 /* INT comes from rx */
384 if (dws->rx && (irq_status & SPI_INT_RXFI)) {
385 if (dws->read(dws))
386 transfer_complete(dws);
387 }
388 return IRQ_HANDLED;
389}
390
391static irqreturn_t dw_spi_irq(int irq, void *dev_id)
392{
393 struct dw_spi *dws = dev_id;
394
395 if (!dws->cur_msg) {
396 spi_mask_intr(dws, SPI_INT_TXEI);
397 /* Never fail */
398 return IRQ_HANDLED;
399 }
400
401 return dws->transfer_handler(dws);
402}
403
404/* Must be called inside pump_transfers() */
405static void poll_transfer(struct dw_spi *dws)
406{
407 if (dws->tx) {
408 while (dws->write(dws))
409 dws->read(dws);
410 }
411
412 dws->read(dws);
413 transfer_complete(dws);
414}
415
416static void dma_transfer(struct dw_spi *dws, int cs_change)
417{
418}
419
420static void pump_transfers(unsigned long data)
421{
422 struct dw_spi *dws = (struct dw_spi *)data;
423 struct spi_message *message = NULL;
424 struct spi_transfer *transfer = NULL;
425 struct spi_transfer *previous = NULL;
426 struct spi_device *spi = NULL;
427 struct chip_data *chip = NULL;
428 u8 bits = 0;
429 u8 imask = 0;
430 u8 cs_change = 0;
431 u16 clk_div = 0;
432 u32 speed = 0;
433 u32 cr0 = 0;
434
435 /* Get current state information */
436 message = dws->cur_msg;
437 transfer = dws->cur_transfer;
438 chip = dws->cur_chip;
439 spi = message->spi;
440
441 if (message->state == ERROR_STATE) {
442 message->status = -EIO;
443 goto early_exit;
444 }
445
446 /* Handle end of message */
447 if (message->state == DONE_STATE) {
448 message->status = 0;
449 goto early_exit;
450 }
451
452 /* Delay if requested at end of transfer*/
453 if (message->state == RUNNING_STATE) {
454 previous = list_entry(transfer->transfer_list.prev,
455 struct spi_transfer,
456 transfer_list);
457 if (previous->delay_usecs)
458 udelay(previous->delay_usecs);
459 }
460
461 dws->n_bytes = chip->n_bytes;
462 dws->dma_width = chip->dma_width;
463 dws->cs_control = chip->cs_control;
464
465 dws->rx_dma = transfer->rx_dma;
466 dws->tx_dma = transfer->tx_dma;
467 dws->tx = (void *)transfer->tx_buf;
468 dws->tx_end = dws->tx + transfer->len;
469 dws->rx = transfer->rx_buf;
470 dws->rx_end = dws->rx + transfer->len;
471 dws->write = dws->tx ? chip->write : null_writer;
472 dws->read = dws->rx ? chip->read : null_reader;
473 dws->cs_change = transfer->cs_change;
474 dws->len = dws->cur_transfer->len;
475 if (chip != dws->prev_chip)
476 cs_change = 1;
477
478 cr0 = chip->cr0;
479
480 /* Handle per transfer options for bpw and speed */
481 if (transfer->speed_hz) {
482 speed = chip->speed_hz;
483
484 if (transfer->speed_hz != speed) {
485 speed = transfer->speed_hz;
486 if (speed > dws->max_freq) {
487 printk(KERN_ERR "MRST SPI0: unsupported"
488 "freq: %dHz\n", speed);
489 message->status = -EIO;
490 goto early_exit;
491 }
492
493 /* clk_div doesn't support odd number */
494 clk_div = dws->max_freq / speed;
495 clk_div = (clk_div >> 1) << 1;
496
497 chip->speed_hz = speed;
498 chip->clk_div = clk_div;
499 }
500 }
501 if (transfer->bits_per_word) {
502 bits = transfer->bits_per_word;
503
504 switch (bits) {
505 case 8:
506 dws->n_bytes = 1;
507 dws->dma_width = 1;
508 dws->read = (dws->read != null_reader) ?
509 u8_reader : null_reader;
510 dws->write = (dws->write != null_writer) ?
511 u8_writer : null_writer;
512 break;
513 case 16:
514 dws->n_bytes = 2;
515 dws->dma_width = 2;
516 dws->read = (dws->read != null_reader) ?
517 u16_reader : null_reader;
518 dws->write = (dws->write != null_writer) ?
519 u16_writer : null_writer;
520 break;
521 default:
522 printk(KERN_ERR "MRST SPI0: unsupported bits:"
523 "%db\n", bits);
524 message->status = -EIO;
525 goto early_exit;
526 }
527
528 cr0 = (bits - 1)
529 | (chip->type << SPI_FRF_OFFSET)
530 | (spi->mode << SPI_MODE_OFFSET)
531 | (chip->tmode << SPI_TMOD_OFFSET);
532 }
533 message->state = RUNNING_STATE;
534
535 /* Check if current transfer is a DMA transaction */
536 dws->dma_mapped = map_dma_buffers(dws);
537
538 if (!dws->dma_mapped && !chip->poll_mode) {
539 if (dws->rx)
540 imask |= SPI_INT_RXFI;
541 if (dws->tx)
542 imask |= SPI_INT_TXEI;
543 dws->transfer_handler = interrupt_transfer;
544 }
545
546 /*
547 * Reprogram registers only if
548 * 1. chip select changes
549 * 2. clk_div is changed
550 * 3. control value changes
551 */
552 if (dw_readw(dws, ctrl0) != cr0 || cs_change || clk_div) {
553 spi_enable_chip(dws, 0);
554
555 if (dw_readw(dws, ctrl0) != cr0)
556 dw_writew(dws, ctrl0, cr0);
557
558 /* Set the interrupt mask, for poll mode just diable all int */
559 spi_mask_intr(dws, 0xff);
560 if (!chip->poll_mode)
561 spi_umask_intr(dws, imask);
562
563 spi_set_clk(dws, clk_div ? clk_div : chip->clk_div);
564 spi_chip_sel(dws, spi->chip_select);
565 spi_enable_chip(dws, 1);
566
567 if (cs_change)
568 dws->prev_chip = chip;
569 }
570
571 if (dws->dma_mapped)
572 dma_transfer(dws, cs_change);
573
574 if (chip->poll_mode)
575 poll_transfer(dws);
576
577 return;
578
579early_exit:
580 giveback(dws);
581 return;
582}
583
584static void pump_messages(struct work_struct *work)
585{
586 struct dw_spi *dws =
587 container_of(work, struct dw_spi, pump_messages);
588 unsigned long flags;
589
590 /* Lock queue and check for queue work */
591 spin_lock_irqsave(&dws->lock, flags);
592 if (list_empty(&dws->queue) || dws->run == QUEUE_STOPPED) {
593 dws->busy = 0;
594 spin_unlock_irqrestore(&dws->lock, flags);
595 return;
596 }
597
598 /* Make sure we are not already running a message */
599 if (dws->cur_msg) {
600 spin_unlock_irqrestore(&dws->lock, flags);
601 return;
602 }
603
604 /* Extract head of queue */
605 dws->cur_msg = list_entry(dws->queue.next, struct spi_message, queue);
606 list_del_init(&dws->cur_msg->queue);
607
608 /* Initial message state*/
609 dws->cur_msg->state = START_STATE;
610 dws->cur_transfer = list_entry(dws->cur_msg->transfers.next,
611 struct spi_transfer,
612 transfer_list);
613 dws->cur_chip = spi_get_ctldata(dws->cur_msg->spi);
614
615 /* Mark as busy and launch transfers */
616 tasklet_schedule(&dws->pump_transfers);
617
618 dws->busy = 1;
619 spin_unlock_irqrestore(&dws->lock, flags);
620}
621
622/* spi_device use this to queue in their spi_msg */
623static int dw_spi_transfer(struct spi_device *spi, struct spi_message *msg)
624{
625 struct dw_spi *dws = spi_master_get_devdata(spi->master);
626 unsigned long flags;
627
628 spin_lock_irqsave(&dws->lock, flags);
629
630 if (dws->run == QUEUE_STOPPED) {
631 spin_unlock_irqrestore(&dws->lock, flags);
632 return -ESHUTDOWN;
633 }
634
635 msg->actual_length = 0;
636 msg->status = -EINPROGRESS;
637 msg->state = START_STATE;
638
639 list_add_tail(&msg->queue, &dws->queue);
640
641 if (dws->run == QUEUE_RUNNING && !dws->busy) {
642
643 if (dws->cur_transfer || dws->cur_msg)
644 queue_work(dws->workqueue,
645 &dws->pump_messages);
646 else {
647 /* If no other data transaction in air, just go */
648 spin_unlock_irqrestore(&dws->lock, flags);
649 pump_messages(&dws->pump_messages);
650 return 0;
651 }
652 }
653
654 spin_unlock_irqrestore(&dws->lock, flags);
655 return 0;
656}
657
658/* This may be called twice for each spi dev */
659static int dw_spi_setup(struct spi_device *spi)
660{
661 struct dw_spi_chip *chip_info = NULL;
662 struct chip_data *chip;
663
664 if (spi->bits_per_word != 8 && spi->bits_per_word != 16)
665 return -EINVAL;
666
667 /* Only alloc on first setup */
668 chip = spi_get_ctldata(spi);
669 if (!chip) {
670 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
671 if (!chip)
672 return -ENOMEM;
673
674 chip->cs_control = null_cs_control;
675 chip->enable_dma = 0;
676 }
677
678 /*
679 * Protocol drivers may change the chip settings, so...
680 * if chip_info exists, use it
681 */
682 chip_info = spi->controller_data;
683
684 /* chip_info doesn't always exist */
685 if (chip_info) {
686 if (chip_info->cs_control)
687 chip->cs_control = chip_info->cs_control;
688
689 chip->poll_mode = chip_info->poll_mode;
690 chip->type = chip_info->type;
691
692 chip->rx_threshold = 0;
693 chip->tx_threshold = 0;
694
695 chip->enable_dma = chip_info->enable_dma;
696 }
697
698 if (spi->bits_per_word <= 8) {
699 chip->n_bytes = 1;
700 chip->dma_width = 1;
701 chip->read = u8_reader;
702 chip->write = u8_writer;
703 } else if (spi->bits_per_word <= 16) {
704 chip->n_bytes = 2;
705 chip->dma_width = 2;
706 chip->read = u16_reader;
707 chip->write = u16_writer;
708 } else {
709 /* Never take >16b case for MRST SPIC */
710 dev_err(&spi->dev, "invalid wordsize\n");
711 return -EINVAL;
712 }
713 chip->bits_per_word = spi->bits_per_word;
714
715 chip->speed_hz = spi->max_speed_hz;
716 if (chip->speed_hz)
717 chip->clk_div = 25000000 / chip->speed_hz;
718 else
719 chip->clk_div = 8; /* default value */
720
721 chip->tmode = 0; /* Tx & Rx */
722 /* Default SPI mode is SCPOL = 0, SCPH = 0 */
723 chip->cr0 = (chip->bits_per_word - 1)
724 | (chip->type << SPI_FRF_OFFSET)
725 | (spi->mode << SPI_MODE_OFFSET)
726 | (chip->tmode << SPI_TMOD_OFFSET);
727
728 spi_set_ctldata(spi, chip);
729 return 0;
730}
731
732static void dw_spi_cleanup(struct spi_device *spi)
733{
734 struct chip_data *chip = spi_get_ctldata(spi);
735 kfree(chip);
736}
737
738static int __init init_queue(struct dw_spi *dws)
739{
740 INIT_LIST_HEAD(&dws->queue);
741 spin_lock_init(&dws->lock);
742
743 dws->run = QUEUE_STOPPED;
744 dws->busy = 0;
745
746 tasklet_init(&dws->pump_transfers,
747 pump_transfers, (unsigned long)dws);
748
749 INIT_WORK(&dws->pump_messages, pump_messages);
750 dws->workqueue = create_singlethread_workqueue(
751 dev_name(dws->master->dev.parent));
752 if (dws->workqueue == NULL)
753 return -EBUSY;
754
755 return 0;
756}
757
758static int start_queue(struct dw_spi *dws)
759{
760 unsigned long flags;
761
762 spin_lock_irqsave(&dws->lock, flags);
763
764 if (dws->run == QUEUE_RUNNING || dws->busy) {
765 spin_unlock_irqrestore(&dws->lock, flags);
766 return -EBUSY;
767 }
768
769 dws->run = QUEUE_RUNNING;
770 dws->cur_msg = NULL;
771 dws->cur_transfer = NULL;
772 dws->cur_chip = NULL;
773 dws->prev_chip = NULL;
774 spin_unlock_irqrestore(&dws->lock, flags);
775
776 queue_work(dws->workqueue, &dws->pump_messages);
777
778 return 0;
779}
780
781static int stop_queue(struct dw_spi *dws)
782{
783 unsigned long flags;
784 unsigned limit = 50;
785 int status = 0;
786
787 spin_lock_irqsave(&dws->lock, flags);
788 dws->run = QUEUE_STOPPED;
789 while (!list_empty(&dws->queue) && dws->busy && limit--) {
790 spin_unlock_irqrestore(&dws->lock, flags);
791 msleep(10);
792 spin_lock_irqsave(&dws->lock, flags);
793 }
794
795 if (!list_empty(&dws->queue) || dws->busy)
796 status = -EBUSY;
797 spin_unlock_irqrestore(&dws->lock, flags);
798
799 return status;
800}
801
802static int destroy_queue(struct dw_spi *dws)
803{
804 int status;
805
806 status = stop_queue(dws);
807 if (status != 0)
808 return status;
809 destroy_workqueue(dws->workqueue);
810 return 0;
811}
812
813/* Restart the controller, disable all interrupts, clean rx fifo */
814static void spi_hw_init(struct dw_spi *dws)
815{
816 spi_enable_chip(dws, 0);
817 spi_mask_intr(dws, 0xff);
818 spi_enable_chip(dws, 1);
819 flush(dws);
820}
821
822int __devinit dw_spi_add_host(struct dw_spi *dws)
823{
824 struct spi_master *master;
825 int ret;
826
827 BUG_ON(dws == NULL);
828
829 master = spi_alloc_master(dws->parent_dev, 0);
830 if (!master) {
831 ret = -ENOMEM;
832 goto exit;
833 }
834
835 dws->master = master;
836 dws->type = SSI_MOTO_SPI;
837 dws->prev_chip = NULL;
838 dws->dma_inited = 0;
839 dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60);
840
841 ret = request_irq(dws->irq, dw_spi_irq, 0,
842 "dw_spi", dws);
843 if (ret < 0) {
844 dev_err(&master->dev, "can not get IRQ\n");
845 goto err_free_master;
846 }
847
848 master->mode_bits = SPI_CPOL | SPI_CPHA;
849 master->bus_num = dws->bus_num;
850 master->num_chipselect = dws->num_cs;
851 master->cleanup = dw_spi_cleanup;
852 master->setup = dw_spi_setup;
853 master->transfer = dw_spi_transfer;
854
855 dws->dma_inited = 0;
856
857 /* Basic HW init */
858 spi_hw_init(dws);
859
860 /* Initial and start queue */
861 ret = init_queue(dws);
862 if (ret) {
863 dev_err(&master->dev, "problem initializing queue\n");
864 goto err_diable_hw;
865 }
866 ret = start_queue(dws);
867 if (ret) {
868 dev_err(&master->dev, "problem starting queue\n");
869 goto err_diable_hw;
870 }
871
872 spi_master_set_devdata(master, dws);
873 ret = spi_register_master(master);
874 if (ret) {
875 dev_err(&master->dev, "problem registering spi master\n");
876 goto err_queue_alloc;
877 }
878
879 mrst_spi_debugfs_init(dws);
880 return 0;
881
882err_queue_alloc:
883 destroy_queue(dws);
884err_diable_hw:
885 spi_enable_chip(dws, 0);
886 free_irq(dws->irq, dws);
887err_free_master:
888 spi_master_put(master);
889exit:
890 return ret;
891}
892EXPORT_SYMBOL(dw_spi_add_host);
893
894void __devexit dw_spi_remove_host(struct dw_spi *dws)
895{
896 int status = 0;
897
898 if (!dws)
899 return;
900 mrst_spi_debugfs_remove(dws);
901
902 /* Remove the queue */
903 status = destroy_queue(dws);
904 if (status != 0)
905 dev_err(&dws->master->dev, "dw_spi_remove: workqueue will not "
906 "complete, message memory not freed\n");
907
908 spi_enable_chip(dws, 0);
909 /* Disable clk */
910 spi_set_clk(dws, 0);
911 free_irq(dws->irq, dws);
912
913 /* Disconnect from the SPI framework */
914 spi_unregister_master(dws->master);
915}
916
917int dw_spi_suspend_host(struct dw_spi *dws)
918{
919 int ret = 0;
920
921 ret = stop_queue(dws);
922 if (ret)
923 return ret;
924 spi_enable_chip(dws, 0);
925 spi_set_clk(dws, 0);
926 return ret;
927}
928EXPORT_SYMBOL(dw_spi_suspend_host);
929
930int dw_spi_resume_host(struct dw_spi *dws)
931{
932 int ret;
933
934 spi_hw_init(dws);
935 ret = start_queue(dws);
936 if (ret)
937 dev_err(&dws->master->dev, "fail to start queue (%d)\n", ret);
938 return ret;
939}
940EXPORT_SYMBOL(dw_spi_resume_host);
941
942MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
943MODULE_DESCRIPTION("Driver for DesignWare SPI controller core");
944MODULE_LICENSE("GPL v2");
diff --git a/drivers/spi/dw_spi_pci.c b/drivers/spi/dw_spi_pci.c
new file mode 100644
index 000000000000..34ba69161734
--- /dev/null
+++ b/drivers/spi/dw_spi_pci.c
@@ -0,0 +1,169 @@
1/*
2 * mrst_spi_pci.c - PCI interface driver for DW SPI Core
3 *
4 * Copyright (c) 2009, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20#include <linux/interrupt.h>
21#include <linux/pci.h>
22#include <linux/spi/dw_spi.h>
23#include <linux/spi/spi.h>
24
25#define DRIVER_NAME "dw_spi_pci"
26
27struct dw_spi_pci {
28 struct pci_dev *pdev;
29 struct dw_spi dws;
30};
31
32static int __devinit spi_pci_probe(struct pci_dev *pdev,
33 const struct pci_device_id *ent)
34{
35 struct dw_spi_pci *dwpci;
36 struct dw_spi *dws;
37 int pci_bar = 0;
38 int ret;
39
40 printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n",
41 pdev->vendor, pdev->device);
42
43 ret = pci_enable_device(pdev);
44 if (ret)
45 return ret;
46
47 dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL);
48 if (!dwpci) {
49 ret = -ENOMEM;
50 goto err_disable;
51 }
52
53 dwpci->pdev = pdev;
54 dws = &dwpci->dws;
55
56 /* Get basic io resource and map it */
57 dws->paddr = pci_resource_start(pdev, pci_bar);
58 dws->iolen = pci_resource_len(pdev, pci_bar);
59
60 ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
61 if (ret)
62 goto err_kfree;
63
64 dws->regs = ioremap_nocache((unsigned long)dws->paddr,
65 pci_resource_len(pdev, pci_bar));
66 if (!dws->regs) {
67 ret = -ENOMEM;
68 goto err_release_reg;
69 }
70
71 dws->parent_dev = &pdev->dev;
72 dws->bus_num = 0;
73 dws->num_cs = 4;
74 dws->max_freq = 25000000; /* for Moorestwon */
75 dws->irq = pdev->irq;
76
77 ret = dw_spi_add_host(dws);
78 if (ret)
79 goto err_unmap;
80
81 /* PCI hook and SPI hook use the same drv data */
82 pci_set_drvdata(pdev, dwpci);
83 return 0;
84
85err_unmap:
86 iounmap(dws->regs);
87err_release_reg:
88 pci_release_region(pdev, pci_bar);
89err_kfree:
90 kfree(dwpci);
91err_disable:
92 pci_disable_device(pdev);
93 return ret;
94}
95
96static void __devexit spi_pci_remove(struct pci_dev *pdev)
97{
98 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
99
100 pci_set_drvdata(pdev, NULL);
101 iounmap(dwpci->dws.regs);
102 pci_release_region(pdev, 0);
103 kfree(dwpci);
104 pci_disable_device(pdev);
105}
106
107#ifdef CONFIG_PM
108static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
109{
110 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
111 int ret;
112
113 ret = dw_spi_suspend_host(&dwpci->dws);
114 if (ret)
115 return ret;
116 pci_save_state(pdev);
117 pci_disable_device(pdev);
118 pci_set_power_state(pdev, pci_choose_state(pdev, state));
119 return ret;
120}
121
122static int spi_resume(struct pci_dev *pdev)
123{
124 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
125 int ret;
126
127 pci_set_power_state(pdev, PCI_D0);
128 pci_restore_state(pdev);
129 ret = pci_enable_device(pdev);
130 if (ret)
131 return ret;
132 return dw_spi_resume_host(&dwpci->dws);
133}
134#else
135#define spi_suspend NULL
136#define spi_resume NULL
137#endif
138
139static const struct pci_device_id pci_ids[] __devinitdata = {
140 /* Intel Moorestown platform SPI controller 0 */
141 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
142 {},
143};
144
145static struct pci_driver dw_spi_driver = {
146 .name = DRIVER_NAME,
147 .id_table = pci_ids,
148 .probe = spi_pci_probe,
149 .remove = __devexit_p(spi_pci_remove),
150 .suspend = spi_suspend,
151 .resume = spi_resume,
152};
153
154static int __init mrst_spi_init(void)
155{
156 return pci_register_driver(&dw_spi_driver);
157}
158
159static void __exit mrst_spi_exit(void)
160{
161 pci_unregister_driver(&dw_spi_driver);
162}
163
164module_init(mrst_spi_init);
165module_exit(mrst_spi_exit);
166
167MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
168MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
169MODULE_LICENSE("GPL v2");
diff --git a/include/linux/spi/dw_spi.h b/include/linux/spi/dw_spi.h
new file mode 100644
index 000000000000..51b3e771a9a3
--- /dev/null
+++ b/include/linux/spi/dw_spi.h
@@ -0,0 +1,212 @@
1#ifndef DW_SPI_HEADER_H
2#define DW_SPI_HEADER_H
3#include <linux/io.h>
4
5/* Bit fields in CTRLR0 */
6#define SPI_DFS_OFFSET 0
7
8#define SPI_FRF_OFFSET 4
9#define SPI_FRF_SPI 0x0
10#define SPI_FRF_SSP 0x1
11#define SPI_FRF_MICROWIRE 0x2
12#define SPI_FRF_RESV 0x3
13
14#define SPI_MODE_OFFSET 6
15#define SPI_SCPH_OFFSET 6
16#define SPI_SCOL_OFFSET 7
17#define SPI_TMOD_OFFSET 8
18#define SPI_TMOD_TR 0x0 /* xmit & recv */
19#define SPI_TMOD_TO 0x1 /* xmit only */
20#define SPI_TMOD_RO 0x2 /* recv only */
21#define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */
22
23#define SPI_SLVOE_OFFSET 10
24#define SPI_SRL_OFFSET 11
25#define SPI_CFS_OFFSET 12
26
27/* Bit fields in SR, 7 bits */
28#define SR_MASK 0x7f /* cover 7 bits */
29#define SR_BUSY (1 << 0)
30#define SR_TF_NOT_FULL (1 << 1)
31#define SR_TF_EMPT (1 << 2)
32#define SR_RF_NOT_EMPT (1 << 3)
33#define SR_RF_FULL (1 << 4)
34#define SR_TX_ERR (1 << 5)
35#define SR_DCOL (1 << 6)
36
37/* Bit fields in ISR, IMR, RISR, 7 bits */
38#define SPI_INT_TXEI (1 << 0)
39#define SPI_INT_TXOI (1 << 1)
40#define SPI_INT_RXUI (1 << 2)
41#define SPI_INT_RXOI (1 << 3)
42#define SPI_INT_RXFI (1 << 4)
43#define SPI_INT_MSTI (1 << 5)
44
45/* TX RX interrupt level threshhold, max can be 256 */
46#define SPI_INT_THRESHOLD 32
47
48enum dw_ssi_type {
49 SSI_MOTO_SPI = 0,
50 SSI_TI_SSP,
51 SSI_NS_MICROWIRE,
52};
53
54struct dw_spi_reg {
55 u32 ctrl0;
56 u32 ctrl1;
57 u32 ssienr;
58 u32 mwcr;
59 u32 ser;
60 u32 baudr;
61 u32 txfltr;
62 u32 rxfltr;
63 u32 txflr;
64 u32 rxflr;
65 u32 sr;
66 u32 imr;
67 u32 isr;
68 u32 risr;
69 u32 txoicr;
70 u32 rxoicr;
71 u32 rxuicr;
72 u32 msticr;
73 u32 icr;
74 u32 dmacr;
75 u32 dmatdlr;
76 u32 dmardlr;
77 u32 idr;
78 u32 version;
79 u32 dr; /* Currently oper as 32 bits,
80 though only low 16 bits matters */
81} __packed;
82
83struct dw_spi {
84 struct spi_master *master;
85 struct spi_device *cur_dev;
86 struct device *parent_dev;
87 enum dw_ssi_type type;
88
89 void __iomem *regs;
90 unsigned long paddr;
91 u32 iolen;
92 int irq;
93 u32 max_freq; /* max bus freq supported */
94
95 u16 bus_num;
96 u16 num_cs; /* supported slave numbers */
97
98 /* Driver message queue */
99 struct workqueue_struct *workqueue;
100 struct work_struct pump_messages;
101 spinlock_t lock;
102 struct list_head queue;
103 int busy;
104 int run;
105
106 /* Message Transfer pump */
107 struct tasklet_struct pump_transfers;
108
109 /* Current message transfer state info */
110 struct spi_message *cur_msg;
111 struct spi_transfer *cur_transfer;
112 struct chip_data *cur_chip;
113 struct chip_data *prev_chip;
114 size_t len;
115 void *tx;
116 void *tx_end;
117 void *rx;
118 void *rx_end;
119 int dma_mapped;
120 dma_addr_t rx_dma;
121 dma_addr_t tx_dma;
122 size_t rx_map_len;
123 size_t tx_map_len;
124 u8 n_bytes; /* current is a 1/2 bytes op */
125 u8 max_bits_per_word; /* maxim is 16b */
126 u32 dma_width;
127 int cs_change;
128 int (*write)(struct dw_spi *dws);
129 int (*read)(struct dw_spi *dws);
130 irqreturn_t (*transfer_handler)(struct dw_spi *dws);
131 void (*cs_control)(u32 command);
132
133 /* Dma info */
134 int dma_inited;
135 struct dma_chan *txchan;
136 struct dma_chan *rxchan;
137 int txdma_done;
138 int rxdma_done;
139 u64 tx_param;
140 u64 rx_param;
141 struct device *dma_dev;
142 dma_addr_t dma_addr;
143
144 /* Bus interface info */
145 void *priv;
146#ifdef CONFIG_DEBUG_FS
147 struct dentry *debugfs;
148#endif
149};
150
151#define dw_readl(dw, name) \
152 __raw_readl(&(((struct dw_spi_reg *)dw->regs)->name))
153#define dw_writel(dw, name, val) \
154 __raw_writel((val), &(((struct dw_spi_reg *)dw->regs)->name))
155#define dw_readw(dw, name) \
156 __raw_readw(&(((struct dw_spi_reg *)dw->regs)->name))
157#define dw_writew(dw, name, val) \
158 __raw_writew((val), &(((struct dw_spi_reg *)dw->regs)->name))
159
160static inline void spi_enable_chip(struct dw_spi *dws, int enable)
161{
162 dw_writel(dws, ssienr, (enable ? 1 : 0));
163}
164
165static inline void spi_set_clk(struct dw_spi *dws, u16 div)
166{
167 dw_writel(dws, baudr, div);
168}
169
170static inline void spi_chip_sel(struct dw_spi *dws, u16 cs)
171{
172 if (cs > dws->num_cs)
173 return;
174 dw_writel(dws, ser, 1 << cs);
175}
176
177/* Disable IRQ bits */
178static inline void spi_mask_intr(struct dw_spi *dws, u32 mask)
179{
180 u32 new_mask;
181
182 new_mask = dw_readl(dws, imr) & ~mask;
183 dw_writel(dws, imr, new_mask);
184}
185
186/* Enable IRQ bits */
187static inline void spi_umask_intr(struct dw_spi *dws, u32 mask)
188{
189 u32 new_mask;
190
191 new_mask = dw_readl(dws, imr) | mask;
192 dw_writel(dws, imr, new_mask);
193}
194
195/*
196 * Each SPI slave device to work with dw_api controller should
197 * has such a structure claiming its working mode (PIO/DMA etc),
198 * which can be save in the "controller_data" member of the
199 * struct spi_device
200 */
201struct dw_spi_chip {
202 u8 poll_mode; /* 0 for contoller polling mode */
203 u8 type; /* SPI/SSP/Micrwire */
204 u8 enable_dma;
205 void (*cs_control)(u32 command);
206};
207
208extern int dw_spi_add_host(struct dw_spi *dws);
209extern void dw_spi_remove_host(struct dw_spi *dws);
210extern int dw_spi_suspend_host(struct dw_spi *dws);
211extern int dw_spi_resume_host(struct dw_spi *dws);
212#endif /* DW_SPI_HEADER_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 14:29:27 -0500