Root/target/linux/cns21xx/patches-3.7/105-cns21xx-spi-driver.patch

1--- a/include/linux/spi/spi.h
2+++ b/include/linux/spi/spi.h
3@@ -507,6 +507,8 @@ struct spi_transfer {
4     u16 delay_usecs;
5     u32 speed_hz;
6 
7+ unsigned last_in_message_list;
8+
9     struct list_head transfer_list;
10 };
11 
12--- a/drivers/spi/Kconfig
13+++ b/drivers/spi/Kconfig
14@@ -179,6 +179,14 @@ config SPI_GPIO_OLD
15 
16       If unsure, say N.
17 
18+config SPI_CNS21XX
19+ tristate "Cavium Netowrks CNS21xx SPI master"
20+ depends on ARCH_CNS21XX && EXPERIMENTAL
21+ select SPI_BITBANG
22+ help
23+ This driver supports the buil-in SPI controller of the Cavium Networks
24+ CNS21xx SoCs.
25+
26 config SPI_IMX
27     tristate "Freescale i.MX SPI controllers"
28     depends on ARCH_MXC
29--- a/drivers/spi/Makefile
30+++ b/drivers/spi/Makefile
31@@ -19,6 +19,7 @@ obj-$(CONFIG_SPI_BFIN5XX) += spi-bfin5x
32 obj-$(CONFIG_SPI_BFIN_SPORT) += spi-bfin-sport.o
33 obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o
34 obj-$(CONFIG_SPI_BUTTERFLY) += spi-butterfly.o
35+obj-$(CONFIG_SPI_CNS21XX) += spi-cns21xx.o
36 obj-$(CONFIG_SPI_COLDFIRE_QSPI) += spi-coldfire-qspi.o
37 obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o
38 obj-$(CONFIG_SPI_DESIGNWARE) += spi-dw.o
39--- a/drivers/spi/spi-bitbang.c
40+++ b/drivers/spi/spi-bitbang.c
41@@ -330,6 +330,13 @@ static void bitbang_work(struct work_str
42                  */
43                 if (!m->is_dma_mapped)
44                     t->rx_dma = t->tx_dma = 0;
45+
46+ if (t->transfer_list.next == &m->transfers) {
47+ t->last_in_message_list = 1;
48+ } else {
49+ t->last_in_message_list = 0;
50+ }
51+
52                 status = bitbang->txrx_bufs(spi, t);
53             }
54             if (status > 0)
55--- /dev/null
56+++ b/drivers/spi/spi-cns21xx.c
57@@ -0,0 +1,521 @@
58+/*
59+ * Copyright (c) 2008 Cavium Networks
60+ * Copyright (c) 2010-2012 Gabor Juhos <juhosg@openwrt.org>
61+ *
62+ * This file is free software; you can redistribute it and/or modify
63+ * it under the terms of the GNU General Public License, Version 2, as
64+ * published by the Free Software Foundation.
65+ */
66+
67+#include <linux/init.h>
68+#include <linux/module.h>
69+#include <linux/spinlock.h>
70+#include <linux/workqueue.h>
71+#include <linux/interrupt.h>
72+#include <linux/delay.h>
73+#include <linux/errno.h>
74+#include <linux/platform_device.h>
75+#include <linux/io.h>
76+#include <linux/spi/spi.h>
77+#include <linux/spi/spi_bitbang.h>
78+
79+#include <mach/hardware.h>
80+#include <mach/cns21xx.h>
81+
82+#define DRIVER_NAME "cns21xx-spi"
83+
84+#ifdef CONFIG_CNS21XX_SPI_DEBUG
85+#define DBG(fmt, args...) pr_info("[CNS21XX_SPI_DEBUG]" fmt, ## args)
86+#else
87+#define DBG(fmt, args...) do {} while (0)
88+#endif /* CNS21XX_SPI_DEBUG */
89+
90+#define SPI_REG_CFG 0x40
91+#define SPI_REG_STAT 0x44
92+#define SPI_REG_BIT_RATE 0x48
93+#define SPI_REG_TX_CTRL 0x4c
94+#define SPI_REG_TX_DATA 0x50
95+#define SPI_REG_RX_CTRL 0x54
96+#define SPI_REG_RX_DATA 0x58
97+#define SPI_REG_FIFO_TX_CFG 0x5c
98+#define SPI_REG_FIFO_TX_CTRL 0x60
99+#define SPI_REG_FIFO_RX_CFG 0x64
100+#define SPI_REG_INTR_STAT 0x68
101+#define SPI_REG_INTR_ENA 0x6c
102+
103+#define CFG_SPI_EN BIT(31)
104+#define CFG_SPI_CLKPOL BIT(14)
105+#define CFG_SPI_CLKPHA BIT(13)
106+#define CFG_SPI_MASTER_EN BIT(11)
107+#define CFG_SPI_CHAR_LEN_M 0x3
108+#define CFG_SPI_CHAR_LEN_8BITS 0
109+#define CFG_SPI_CHAR_LEN_16BITS 1
110+#define CFG_SPI_CHAR_LEN_24BITS 2
111+#define CFG_SPI_CHAR_LEN_32BITS 3
112+
113+#define STAT_SPI_BUSY_STA BIT(1)
114+
115+#define BIT_RATE_DIV_1 0
116+#define BIT_RATE_DIV_2 1
117+#define BIT_RATE_DIV_4 2
118+#define BIT_RATE_DIV_8 3
119+#define BIT_RATE_DIV_16 4
120+#define BIT_RATE_DIV_32 5
121+#define BIT_RATE_DIV_64 6
122+#define BIT_RATE_DIV_128 7
123+
124+#define TX_CTRL_SPI_TXDAT_EOF BIT(2)
125+#define TX_CTRL_SPI_TXCH_NUM_M 0x3
126+#define TX_CTRL_CLEAR_MASK (TX_CTRL_SPI_TXDAT_EOF | \
127+ TX_CTRL_SPI_TXCH_NUM_M)
128+
129+#define RX_CTRL_SPI_RXDAT_EOF BIT(2)
130+#define RX_CTRL_SPI_RXCH_NUM_M 0x3
131+
132+#define INTR_STAT_SPI_TXBF_UNRN_FG BIT(7)
133+#define INTR_STAT_SPI_RXBF_OVRN_FG BIT(6)
134+#define INTR_STAT_SPI_TXFF_UNRN_FG BIT(5)
135+#define INTR_STAT_SPI_RXFF_OVRN_FG BIT(4)
136+#define INTR_STAT_SPI_TXBUF_FG BIT(3)
137+#define INTR_STAT_SPI_RXBUF_FG BIT(2)
138+#define INTR_STAT_SPI_TXFF_FG BIT(1)
139+#define INTR_STAT_SPI_RXFF_FG BIT(0)
140+
141+#define INTR_STAT_CLEAR_MASK (INTR_STAT_SPI_TXBF_UNRN_FG | \
142+ INTR_STAT_SPI_RXBF_OVRN_FG | \
143+ INTR_STAT_SPI_TXFF_UNRN_FG | \
144+ INTR_STAT_SPI_RXFF_OVRN_FG)
145+
146+#define FIFO_TX_CFG_SPI_TXFF_THRED_M 0x3
147+#define FIFO_TX_CFG_SPI_TXFF_THRED_S 4
148+#define FIFO_TX_CFG_SPI_TXFF_THRED_2 0
149+#define FIFO_TX_CFG_SPI_TXFF_THRED_4 1
150+#define FIFO_TX_CFG_SPI_TXFF_THRED_6 0
151+#define FIFO_TX_CFG_SPI_TXFF_STATUS_M 0xf
152+
153+#define FIFO_RX_CFG_SPI_RXFF_THRED_M 0x3
154+#define FIFO_RX_CFG_SPI_RXFF_THRED_S 4
155+#define FIFO_RX_CFG_SPI_RXFF_THRED_2 0
156+#define FIFO_RX_CFG_SPI_RXFF_THRED_4 1
157+#define FIFO_RX_CFG_SPI_RXFF_THRED_6 0
158+#define FIFO_RX_CFG_SPI_RXFF_STATUS_M 0xf
159+
160+#define CNS21XX_SPI_NUM_BIT_RATES 8
161+
162+struct cns21xx_spi {
163+ struct spi_bitbang bitbang;
164+
165+ struct spi_master *master;
166+ struct device *dev;
167+ void __iomem *base;
168+ struct resource *region;
169+
170+ unsigned freq_max;
171+ unsigned freq_min;
172+
173+};
174+
175+static inline struct cns21xx_spi *to_hw(struct spi_device *spi)
176+{
177+ return spi_master_get_devdata(spi->master);
178+}
179+
180+static inline u32 cns21xx_spi_rr(struct cns21xx_spi *hw, unsigned int reg)
181+{
182+ return __raw_readl(hw->base + reg);
183+}
184+
185+static inline void cns21xx_spi_wr(struct cns21xx_spi *hw, u32 val,
186+ unsigned int reg)
187+{
188+ __raw_writel(val, hw->base + reg);
189+}
190+
191+#define CNS21XX_SPI_RETRY_COUNT 100
192+static inline int cns21xx_spi_wait(struct cns21xx_spi *hw, unsigned int reg,
193+ u32 mask, u32 val)
194+{
195+ int retry_cnt = 0;
196+
197+ do {
198+ if ((cns21xx_spi_rr(hw, reg) & mask) == val)
199+ break;
200+
201+ if (++retry_cnt > CNS21XX_SPI_RETRY_COUNT) {
202+ dev_err(hw->dev, "timeout waiting on register %02x\n",
203+ reg);
204+ return -EIO;
205+ }
206+ } while (1);
207+
208+ return 0;
209+}
210+
211+static int cns21xx_spi_txrx_word(struct cns21xx_spi *hw, u8 tx_channel,
212+ u8 tx_eof_flag, u32 tx_data, u32 *rx_data)
213+{
214+ unsigned int tx_ctrl;
215+ u8 rx_channel;
216+ u8 rx_eof_flag;
217+ int err = 0;
218+
219+ err = cns21xx_spi_wait(hw, SPI_REG_STAT, STAT_SPI_BUSY_STA, 0);
220+ if (err)
221+ return err;
222+
223+ err = cns21xx_spi_wait(hw, SPI_REG_INTR_STAT, INTR_STAT_SPI_TXBUF_FG,
224+ INTR_STAT_SPI_TXBUF_FG);
225+ if (err)
226+ return err;
227+
228+ tx_ctrl = cns21xx_spi_rr(hw, SPI_REG_TX_CTRL);
229+ tx_ctrl &= ~(TX_CTRL_CLEAR_MASK);
230+ tx_ctrl |= (tx_channel & TX_CTRL_SPI_TXCH_NUM_M);
231+ tx_ctrl |= (tx_eof_flag) ? TX_CTRL_SPI_TXDAT_EOF : 0;
232+ cns21xx_spi_wr(hw, tx_ctrl, SPI_REG_TX_CTRL);
233+
234+ cns21xx_spi_wr(hw, tx_data, SPI_REG_TX_DATA);
235+
236+ err = cns21xx_spi_wait(hw, SPI_REG_INTR_STAT, INTR_STAT_SPI_RXBUF_FG,
237+ INTR_STAT_SPI_RXBUF_FG);
238+ if (err)
239+ return err;
240+
241+ rx_channel = cns21xx_spi_rr(hw, SPI_REG_RX_CTRL) &
242+ RX_CTRL_SPI_RXCH_NUM_M;
243+
244+ rx_eof_flag = (cns21xx_spi_rr(hw, SPI_REG_RX_CTRL) &
245+ RX_CTRL_SPI_RXDAT_EOF) ? 1 : 0;
246+
247+ *rx_data = cns21xx_spi_rr(hw, SPI_REG_RX_DATA);
248+
249+ if ((tx_channel != rx_channel) || (tx_eof_flag != rx_eof_flag))
250+ return -EPROTO;
251+
252+ return 0;
253+}
254+
255+static void cns21xx_spi_chipselect(struct spi_device *spi, int value)
256+{
257+ struct cns21xx_spi *hw = to_hw(spi);
258+ unsigned int spi_config;
259+ unsigned int tx_ctrl;
260+
261+ switch (value) {
262+ case BITBANG_CS_INACTIVE:
263+ break;
264+
265+ case BITBANG_CS_ACTIVE:
266+ spi_config = cns21xx_spi_rr(hw, SPI_REG_CFG);
267+
268+ if (spi->mode & SPI_CPHA)
269+ spi_config |= CFG_SPI_CLKPHA;
270+ else
271+ spi_config &= ~CFG_SPI_CLKPHA;
272+
273+ if (spi->mode & SPI_CPOL)
274+ spi_config |= CFG_SPI_CLKPOL;
275+ else
276+ spi_config &= ~CFG_SPI_CLKPOL;
277+
278+ cns21xx_spi_wr(hw, spi_config, SPI_REG_CFG);
279+
280+ tx_ctrl = cns21xx_spi_rr(hw, SPI_REG_TX_CTRL);
281+ tx_ctrl &= ~(TX_CTRL_CLEAR_MASK);
282+ tx_ctrl |= (spi->chip_select & TX_CTRL_SPI_TXCH_NUM_M);
283+ cns21xx_spi_wr(hw, tx_ctrl, SPI_REG_TX_CTRL);
284+
285+ break;
286+ }
287+}
288+
289+static int cns21xx_spi_setup(struct spi_device *spi)
290+{
291+ struct cns21xx_spi *hw = to_hw(spi);
292+
293+ if (spi->bits_per_word != 8) {
294+ dev_err(&spi->dev, "%s: invalid bits_per_word=%u\n",
295+ __func__, spi->bits_per_word);
296+ return -EINVAL;
297+ }
298+
299+ if (spi->max_speed_hz == 0)
300+ spi->max_speed_hz = hw->freq_max;
301+
302+ if (spi->max_speed_hz > hw->freq_max ||
303+ spi->max_speed_hz < hw->freq_min) {
304+ dev_err(&spi->dev, "%s: max_speed_hz=%u out of range\n",
305+ __func__, spi->max_speed_hz);
306+ return -EINVAL;
307+ }
308+
309+ return 0;
310+}
311+
312+static int cns21xx_spi_setup_transfer(struct spi_device *spi,
313+ struct spi_transfer *t)
314+{
315+ struct cns21xx_spi *hw = to_hw(spi);
316+ u8 bits_per_word;
317+ u32 hz;
318+ int i;
319+
320+ bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
321+ hz = t ? t->speed_hz : spi->max_speed_hz;
322+
323+ if (!bits_per_word)
324+ bits_per_word = spi->bits_per_word;
325+
326+ if (!hz)
327+ hz = spi->max_speed_hz;
328+
329+ if (bits_per_word != 8) {
330+ dev_err(&spi->dev, "%s: invalid bits_per_word=%u\n",
331+ __func__, bits_per_word);
332+ return -EINVAL;
333+ }
334+
335+ if (hz > spi->max_speed_hz || hz > hw->freq_max || hz < hw->freq_min) {
336+ dev_err(&spi->dev, "%s: max_speed_hz=%u out of range\n",
337+ __func__, hz);
338+ return -EINVAL;
339+ }
340+
341+ for (i = 0; i < CNS21XX_SPI_NUM_BIT_RATES; i++)
342+ if (spi->max_speed_hz > (cns21xx_get_apb_freq() >> i))
343+ break;
344+
345+ DBG("max_speed:%uHz, curr_speed:%luHz, rate_index=%d\n",
346+ spi->max_speed_hz, cns21xx_get_apb_freq() / (1 << i), i);
347+
348+ cns21xx_spi_wr(hw, i, SPI_REG_BIT_RATE);
349+
350+ return 0;
351+}
352+
353+static int cns21xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
354+{
355+ struct cns21xx_spi *hw = to_hw(spi);
356+ const unsigned char *tx_buf;
357+ unsigned char *rx_buf;
358+ u32 rx_data;
359+ int tx_eof;
360+ int err = 0;
361+ int i;
362+
363+ tx_buf = t->tx_buf;
364+ rx_buf = t->rx_buf;
365+ tx_eof = t->last_in_message_list;
366+
367+ DBG("txrx: tx %p, rx %p, len %d\n", tx_buf, rx_buf, t->len);
368+
369+ if (tx_buf) {
370+ for (i = 0; i < t->len; i++)
371+ DBG("tx_buf[%02d]: 0x%02x\n", i, tx_buf[i]);
372+
373+ for (i = 0; i < (t->len - 1); i++) {
374+ err = cns21xx_spi_txrx_word(hw, spi->chip_select, 0,
375+ tx_buf[i], &rx_data);
376+ if (err)
377+ goto done;
378+
379+ if (rx_buf) {
380+ rx_buf[i] = rx_data;
381+ DBG("rx_buf[%02d]:0x%02x\n", i, rx_buf[i]);
382+ }
383+ }
384+
385+ err = cns21xx_spi_txrx_word(hw, spi->chip_select, tx_eof,
386+ tx_buf[i], &rx_data);
387+ if (err)
388+ goto done;
389+
390+ if ((tx_eof) && rx_buf) {
391+ rx_buf[i] = rx_data;
392+ DBG("rx_buf[%02d]:0x%02x\n", i, rx_buf[i]);
393+ }
394+ } else if (rx_buf) {
395+ for (i = 0; i < (t->len - 1); i++) {
396+ err = cns21xx_spi_txrx_word(hw, spi->chip_select, 0,
397+ 0xff, &rx_data);
398+ if (err)
399+ goto done;
400+
401+ rx_buf[i] = rx_data;
402+ DBG("rx_buf[%02d]:0x%02x\n", i, rx_buf[i]);
403+ }
404+
405+ err = cns21xx_spi_txrx_word(hw, spi->chip_select, tx_eof,
406+ 0xff, &rx_data);
407+ if (err)
408+ goto done;
409+
410+ rx_buf[i] = rx_data;
411+ DBG("rx_buf[%02d]:0x%02x\n", i, rx_buf[i]);
412+ }
413+
414+ done:
415+ return (err) ? err : t->len;
416+}
417+
418+static void __init cns21xx_spi_hw_init(struct cns21xx_spi *hw)
419+{
420+ u32 t;
421+ u32 pclk;
422+
423+ /* Setup configuration register */
424+ cns21xx_spi_wr(hw, CFG_SPI_MASTER_EN, SPI_REG_CFG);
425+
426+ /* Set default clock to PCLK/2 */
427+ cns21xx_spi_wr(hw, BIT_RATE_DIV_2, SPI_REG_BIT_RATE);
428+
429+ /* Configure SPI's Tx channel */
430+ cns21xx_spi_wr(hw, 0, SPI_REG_TX_CTRL);
431+
432+ /* Configure Tx FIFO Threshold */
433+ t = cns21xx_spi_rr(hw, SPI_REG_FIFO_TX_CFG);
434+ t &= ~(FIFO_TX_CFG_SPI_TXFF_THRED_M << FIFO_TX_CFG_SPI_TXFF_THRED_S);
435+ t |= (FIFO_TX_CFG_SPI_TXFF_THRED_2 << FIFO_TX_CFG_SPI_TXFF_THRED_S);
436+ cns21xx_spi_wr(hw, t, SPI_REG_FIFO_TX_CFG);
437+
438+ /* Configure Rx FIFO Threshold */
439+ t = cns21xx_spi_rr(hw, SPI_REG_FIFO_RX_CFG);
440+ t &= ~(FIFO_RX_CFG_SPI_RXFF_THRED_M << FIFO_RX_CFG_SPI_RXFF_THRED_S);
441+ t |= (FIFO_RX_CFG_SPI_RXFF_THRED_2 << FIFO_RX_CFG_SPI_RXFF_THRED_S);
442+ cns21xx_spi_wr(hw, t, SPI_REG_FIFO_RX_CFG);
443+
444+ /* Disable interrupts, and clear interrupt status */
445+ cns21xx_spi_wr(hw, 0, SPI_REG_INTR_ENA);
446+ cns21xx_spi_wr(hw, INTR_STAT_CLEAR_MASK, SPI_REG_INTR_STAT);
447+
448+ (void) cns21xx_spi_rr(hw, SPI_REG_RX_DATA);
449+
450+ /* Enable SPI */
451+ t = cns21xx_spi_rr(hw, SPI_REG_CFG);
452+ t |= CFG_SPI_EN;
453+ cns21xx_spi_wr(hw, t, SPI_REG_CFG);
454+
455+ pclk = cns21xx_get_apb_freq();
456+ hw->freq_max = pclk;
457+ hw->freq_min = pclk / (1 << BIT_RATE_DIV_128);
458+}
459+
460+static int __init cns21xx_spi_probe(struct platform_device *pdev)
461+{
462+ struct cns21xx_spi *hw;
463+ struct spi_master *master;
464+ struct resource *res;
465+ int err = 0;
466+
467+ master = spi_alloc_master(&pdev->dev, sizeof(struct cns21xx_spi));
468+ if (!master) {
469+ dev_err(&pdev->dev, "No memory for spi_master\n");
470+ return -ENOMEM;
471+ }
472+
473+ hw = spi_master_get_devdata(master);
474+
475+ platform_set_drvdata(pdev, hw);
476+ hw->master = spi_master_get(master);
477+ hw->dev = &pdev->dev;
478+
479+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
480+ if (!res) {
481+ dev_dbg(&pdev->dev, "no MEM resource found\n");
482+ err = -ENOENT;
483+ goto err_put_master;
484+ }
485+
486+ hw->region = request_mem_region(res->start, resource_size(res),
487+ dev_name(&pdev->dev));
488+ if (!hw->region) {
489+ dev_err(&pdev->dev, "unable to reserve iomem region\n");
490+ err = -ENXIO;
491+ goto err_put_master;
492+ }
493+
494+ hw->base = ioremap(res->start, resource_size(res));
495+ if (!hw->base) {
496+ dev_err(&pdev->dev, "ioremap failed\n");
497+ err = -ENOENT;
498+ goto err_release_region;
499+ }
500+
501+ cns21xx_spi_hw_init(hw);
502+
503+ master->bus_num = pdev->id;
504+ if (master->bus_num == -1)
505+ master->bus_num = 0;
506+
507+ master->num_chipselect = 4;
508+ master->setup = cns21xx_spi_setup;
509+
510+ hw->bitbang.master = hw->master;
511+ hw->bitbang.chipselect = cns21xx_spi_chipselect;
512+ hw->bitbang.txrx_bufs = cns21xx_spi_txrx;
513+ hw->bitbang.setup_transfer = cns21xx_spi_setup_transfer;
514+
515+ err = spi_bitbang_start(&hw->bitbang);
516+ if (err) {
517+ dev_err(hw->dev, "unable to register SPI master\n");
518+ goto err_unmap;
519+ }
520+
521+ dev_info(hw->dev, "iomem at %08x\n", res->start);
522+
523+ return 0;
524+
525+ err_unmap:
526+ iounmap(hw->base);
527+
528+ err_release_region:
529+ release_resource(hw->region);
530+ kfree(hw->region);
531+
532+ err_put_master:
533+ spi_master_put(hw->bitbang.master);
534+ platform_set_drvdata(pdev, NULL);
535+
536+ return err;
537+}
538+
539+static int __devexit cns21xx_spi_remove(struct platform_device *pdev)
540+{
541+ struct cns21xx_spi *hw = platform_get_drvdata(pdev);
542+
543+ spi_bitbang_stop(&hw->bitbang);
544+ iounmap(hw->base);
545+ release_resource(hw->region);
546+ kfree(hw->region);
547+ spi_master_put(hw->bitbang.master);
548+ platform_set_drvdata(pdev, NULL);
549+
550+ return 0;
551+}
552+
553+static struct platform_driver cns21xx_spi_driver = {
554+ .remove = __devexit_p(cns21xx_spi_remove),
555+ .driver = {
556+ .name = DRIVER_NAME,
557+ .owner = THIS_MODULE,
558+ },
559+};
560+
561+static int __init cns21xx_spi_init(void)
562+{
563+ return platform_driver_probe(&cns21xx_spi_driver, cns21xx_spi_probe);
564+}
565+
566+static void __exit cns21xx_spi_exit(void)
567+{
568+ platform_driver_unregister(&cns21xx_spi_driver);
569+}
570+
571+module_init(cns21xx_spi_init);
572+module_exit(cns21xx_spi_exit);
573+
574+MODULE_DESCRIPTION("Cavium Networks CNS21xx SPI Controller driver");
575+MODULE_AUTHOR("STAR Semi Corp.");
576+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
577+MODULE_LICENSE("GPL v2");
578+MODULE_ALIAS("platform:" DRIVER_NAME);
579

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