2 * TXx9 NAND flash memory controller driver
3 * Based on RBTX49xx patch from CELF patch archive.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * (C) Copyright TOSHIBA CORPORATION 2004-2007
10 * All Rights Reserved.
12 #include <linux/err.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/delay.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/nand.h>
20 #include <linux/mtd/nand_ecc.h>
21 #include <linux/mtd/partitions.h>
23 #include <asm/txx9/ndfmc.h>
25 /* TXX9 NDFMC Registers */
26 #define TXX9_NDFDTR 0x00
27 #define TXX9_NDFMCR 0x04
28 #define TXX9_NDFSR 0x08
29 #define TXX9_NDFISR 0x0c
30 #define TXX9_NDFIMR 0x10
31 #define TXX9_NDFSPR 0x14
32 #define TXX9_NDFRSTR 0x18 /* not TX4939 */
34 /* NDFMCR : NDFMC Mode Control */
35 #define TXX9_NDFMCR_WE 0x80
36 #define TXX9_NDFMCR_ECC_ALL 0x60
37 #define TXX9_NDFMCR_ECC_RESET 0x60
38 #define TXX9_NDFMCR_ECC_READ 0x40
39 #define TXX9_NDFMCR_ECC_ON 0x20
40 #define TXX9_NDFMCR_ECC_OFF 0x00
41 #define TXX9_NDFMCR_CE 0x10
42 #define TXX9_NDFMCR_BSPRT 0x04 /* TX4925/TX4926 only */
43 #define TXX9_NDFMCR_ALE 0x02
44 #define TXX9_NDFMCR_CLE 0x01
46 #define TXX9_NDFMCR_X16 0x0400
47 #define TXX9_NDFMCR_DMAREQ_MASK 0x0300
48 #define TXX9_NDFMCR_DMAREQ_NODMA 0x0000
49 #define TXX9_NDFMCR_DMAREQ_128 0x0100
50 #define TXX9_NDFMCR_DMAREQ_256 0x0200
51 #define TXX9_NDFMCR_DMAREQ_512 0x0300
52 #define TXX9_NDFMCR_CS_MASK 0x0c
53 #define TXX9_NDFMCR_CS(ch) ((ch) << 2)
55 /* NDFMCR : NDFMC Status */
56 #define TXX9_NDFSR_BUSY 0x80
58 #define TXX9_NDFSR_DMARUN 0x40
60 /* NDFMCR : NDFMC Reset */
61 #define TXX9_NDFRSTR_RST 0x01
63 struct txx9ndfmc_priv {
64 struct platform_device *dev;
65 struct nand_chip chip;
70 #define MAX_TXX9NDFMC_DEV 4
71 struct txx9ndfmc_drvdata {
72 struct mtd_info *mtds[MAX_TXX9NDFMC_DEV];
74 unsigned char hold; /* in gbusclock */
75 unsigned char spw; /* in gbusclock */
76 struct nand_hw_control hw_control;
79 static struct platform_device *mtd_to_platdev(struct mtd_info *mtd)
81 struct nand_chip *chip = mtd_to_nand(mtd);
82 struct txx9ndfmc_priv *txx9_priv = nand_get_controller_data(chip);
83 return txx9_priv->dev;
86 static void __iomem *ndregaddr(struct platform_device *dev, unsigned int reg)
88 struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
89 struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
91 return drvdata->base + (reg << plat->shift);
94 static u32 txx9ndfmc_read(struct platform_device *dev, unsigned int reg)
96 return __raw_readl(ndregaddr(dev, reg));
99 static void txx9ndfmc_write(struct platform_device *dev,
100 u32 val, unsigned int reg)
102 __raw_writel(val, ndregaddr(dev, reg));
105 static uint8_t txx9ndfmc_read_byte(struct mtd_info *mtd)
107 struct platform_device *dev = mtd_to_platdev(mtd);
109 return txx9ndfmc_read(dev, TXX9_NDFDTR);
112 static void txx9ndfmc_write_buf(struct mtd_info *mtd, const uint8_t *buf,
115 struct platform_device *dev = mtd_to_platdev(mtd);
116 void __iomem *ndfdtr = ndregaddr(dev, TXX9_NDFDTR);
117 u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
119 txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_WE, TXX9_NDFMCR);
121 __raw_writel(*buf++, ndfdtr);
122 txx9ndfmc_write(dev, mcr, TXX9_NDFMCR);
125 static void txx9ndfmc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
127 struct platform_device *dev = mtd_to_platdev(mtd);
128 void __iomem *ndfdtr = ndregaddr(dev, TXX9_NDFDTR);
131 *buf++ = __raw_readl(ndfdtr);
134 static void txx9ndfmc_cmd_ctrl(struct mtd_info *mtd, int cmd,
137 struct nand_chip *chip = mtd_to_nand(mtd);
138 struct txx9ndfmc_priv *txx9_priv = nand_get_controller_data(chip);
139 struct platform_device *dev = txx9_priv->dev;
140 struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
142 if (ctrl & NAND_CTRL_CHANGE) {
143 u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
145 mcr &= ~(TXX9_NDFMCR_CLE | TXX9_NDFMCR_ALE | TXX9_NDFMCR_CE);
146 mcr |= ctrl & NAND_CLE ? TXX9_NDFMCR_CLE : 0;
147 mcr |= ctrl & NAND_ALE ? TXX9_NDFMCR_ALE : 0;
148 /* TXX9_NDFMCR_CE bit is 0:high 1:low */
149 mcr |= ctrl & NAND_NCE ? TXX9_NDFMCR_CE : 0;
150 if (txx9_priv->cs >= 0 && (ctrl & NAND_NCE)) {
151 mcr &= ~TXX9_NDFMCR_CS_MASK;
152 mcr |= TXX9_NDFMCR_CS(txx9_priv->cs);
154 txx9ndfmc_write(dev, mcr, TXX9_NDFMCR);
156 if (cmd != NAND_CMD_NONE)
157 txx9ndfmc_write(dev, cmd & 0xff, TXX9_NDFDTR);
158 if (plat->flags & NDFMC_PLAT_FLAG_DUMMYWRITE) {
159 /* dummy write to update external latch */
160 if ((ctrl & NAND_CTRL_CHANGE) && cmd == NAND_CMD_NONE)
161 txx9ndfmc_write(dev, 0, TXX9_NDFDTR);
166 static int txx9ndfmc_dev_ready(struct mtd_info *mtd)
168 struct platform_device *dev = mtd_to_platdev(mtd);
170 return !(txx9ndfmc_read(dev, TXX9_NDFSR) & TXX9_NDFSR_BUSY);
173 static int txx9ndfmc_calculate_ecc(struct mtd_info *mtd, const uint8_t *dat,
176 struct platform_device *dev = mtd_to_platdev(mtd);
177 struct nand_chip *chip = mtd_to_nand(mtd);
179 u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
181 mcr &= ~TXX9_NDFMCR_ECC_ALL;
182 txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
183 txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_READ, TXX9_NDFMCR);
184 for (eccbytes = chip->ecc.bytes; eccbytes > 0; eccbytes -= 3) {
185 ecc_code[1] = txx9ndfmc_read(dev, TXX9_NDFDTR);
186 ecc_code[0] = txx9ndfmc_read(dev, TXX9_NDFDTR);
187 ecc_code[2] = txx9ndfmc_read(dev, TXX9_NDFDTR);
190 txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
194 static int txx9ndfmc_correct_data(struct mtd_info *mtd, unsigned char *buf,
195 unsigned char *read_ecc, unsigned char *calc_ecc)
197 struct nand_chip *chip = mtd_to_nand(mtd);
202 for (eccsize = chip->ecc.size; eccsize > 0; eccsize -= 256) {
203 stat = __nand_correct_data(buf, read_ecc, calc_ecc, 256);
214 static void txx9ndfmc_enable_hwecc(struct mtd_info *mtd, int mode)
216 struct platform_device *dev = mtd_to_platdev(mtd);
217 u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
219 mcr &= ~TXX9_NDFMCR_ECC_ALL;
220 txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_RESET, TXX9_NDFMCR);
221 txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
222 txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_ON, TXX9_NDFMCR);
225 static void txx9ndfmc_initialize(struct platform_device *dev)
227 struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
228 struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
231 if (plat->flags & NDFMC_PLAT_FLAG_NO_RSTR)
232 ; /* no NDFRSTR. Write to NDFSPR resets the NDFMC. */
236 txx9ndfmc_read(dev, TXX9_NDFRSTR) |
239 while (txx9ndfmc_read(dev, TXX9_NDFRSTR) & TXX9_NDFRSTR_RST) {
241 dev_err(&dev->dev, "reset failed.\n");
247 /* setup Hold Time, Strobe Pulse Width */
248 txx9ndfmc_write(dev, (drvdata->hold << 4) | drvdata->spw, TXX9_NDFSPR);
250 (plat->flags & NDFMC_PLAT_FLAG_USE_BSPRT) ?
251 TXX9_NDFMCR_BSPRT : 0, TXX9_NDFMCR);
254 #define TXX9NDFMC_NS_TO_CYC(gbusclk, ns) \
255 DIV_ROUND_UP((ns) * DIV_ROUND_UP(gbusclk, 1000), 1000000)
257 static int txx9ndfmc_nand_scan(struct mtd_info *mtd)
259 struct nand_chip *chip = mtd_to_nand(mtd);
262 ret = nand_scan_ident(mtd, 1, NULL);
264 if (mtd->writesize >= 512) {
265 /* Hardware ECC 6 byte ECC per 512 Byte data */
266 chip->ecc.size = 512;
269 ret = nand_scan_tail(mtd);
274 static int __init txx9ndfmc_probe(struct platform_device *dev)
276 struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
279 struct txx9ndfmc_drvdata *drvdata;
280 unsigned long gbusclk = plat->gbus_clock;
281 struct resource *res;
283 drvdata = devm_kzalloc(&dev->dev, sizeof(*drvdata), GFP_KERNEL);
286 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
287 drvdata->base = devm_ioremap_resource(&dev->dev, res);
288 if (IS_ERR(drvdata->base))
289 return PTR_ERR(drvdata->base);
291 hold = plat->hold ?: 20; /* tDH */
292 spw = plat->spw ?: 90; /* max(tREADID, tWP, tRP) */
294 hold = TXX9NDFMC_NS_TO_CYC(gbusclk, hold);
295 spw = TXX9NDFMC_NS_TO_CYC(gbusclk, spw);
296 if (plat->flags & NDFMC_PLAT_FLAG_HOLDADD)
297 hold -= 2; /* actual hold time : (HOLD + 2) BUSCLK */
298 spw -= 1; /* actual wait time : (SPW + 1) BUSCLK */
299 hold = clamp(hold, 1, 15);
300 drvdata->hold = hold;
301 spw = clamp(spw, 1, 15);
303 dev_info(&dev->dev, "CLK:%ldMHz HOLD:%d SPW:%d\n",
304 (gbusclk + 500000) / 1000000, hold, spw);
306 nand_hw_control_init(&drvdata->hw_control);
308 platform_set_drvdata(dev, drvdata);
309 txx9ndfmc_initialize(dev);
311 for (i = 0; i < MAX_TXX9NDFMC_DEV; i++) {
312 struct txx9ndfmc_priv *txx9_priv;
313 struct nand_chip *chip;
314 struct mtd_info *mtd;
316 if (!(plat->ch_mask & (1 << i)))
318 txx9_priv = kzalloc(sizeof(struct txx9ndfmc_priv),
322 chip = &txx9_priv->chip;
323 mtd = nand_to_mtd(chip);
324 mtd->dev.parent = &dev->dev;
326 chip->read_byte = txx9ndfmc_read_byte;
327 chip->read_buf = txx9ndfmc_read_buf;
328 chip->write_buf = txx9ndfmc_write_buf;
329 chip->cmd_ctrl = txx9ndfmc_cmd_ctrl;
330 chip->dev_ready = txx9ndfmc_dev_ready;
331 chip->ecc.calculate = txx9ndfmc_calculate_ecc;
332 chip->ecc.correct = txx9ndfmc_correct_data;
333 chip->ecc.hwctl = txx9ndfmc_enable_hwecc;
334 chip->ecc.mode = NAND_ECC_HW;
335 /* txx9ndfmc_nand_scan will overwrite ecc.size and ecc.bytes */
336 chip->ecc.size = 256;
338 chip->ecc.strength = 1;
339 chip->chip_delay = 100;
340 chip->controller = &drvdata->hw_control;
342 nand_set_controller_data(chip, txx9_priv);
343 txx9_priv->dev = dev;
345 if (plat->ch_mask != 1) {
347 txx9_priv->mtdname = kasprintf(GFP_KERNEL, "%s.%u",
348 dev_name(&dev->dev), i);
351 txx9_priv->mtdname = kstrdup(dev_name(&dev->dev),
354 if (!txx9_priv->mtdname) {
356 dev_err(&dev->dev, "Unable to allocate MTD name.\n");
359 if (plat->wide_mask & (1 << i))
360 chip->options |= NAND_BUSWIDTH_16;
362 if (txx9ndfmc_nand_scan(mtd)) {
363 kfree(txx9_priv->mtdname);
367 mtd->name = txx9_priv->mtdname;
369 mtd_device_parse_register(mtd, NULL, NULL, NULL, 0);
370 drvdata->mtds[i] = mtd;
376 static int __exit txx9ndfmc_remove(struct platform_device *dev)
378 struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
383 for (i = 0; i < MAX_TXX9NDFMC_DEV; i++) {
384 struct mtd_info *mtd = drvdata->mtds[i];
385 struct nand_chip *chip;
386 struct txx9ndfmc_priv *txx9_priv;
390 chip = mtd_to_nand(mtd);
391 txx9_priv = nand_get_controller_data(chip);
394 kfree(txx9_priv->mtdname);
401 static int txx9ndfmc_resume(struct platform_device *dev)
403 if (platform_get_drvdata(dev))
404 txx9ndfmc_initialize(dev);
408 #define txx9ndfmc_resume NULL
411 static struct platform_driver txx9ndfmc_driver = {
412 .remove = __exit_p(txx9ndfmc_remove),
413 .resume = txx9ndfmc_resume,
419 module_platform_driver_probe(txx9ndfmc_driver, txx9ndfmc_probe);
421 MODULE_LICENSE("GPL");
422 MODULE_DESCRIPTION("TXx9 SoC NAND flash controller driver");
423 MODULE_ALIAS("platform:txx9ndfmc");