blob: 9f1b451005ca14f8ce73aaa3c64e087cf2e7e607 [file] [log] [blame]
David Woodhouse179fdc32006-05-11 22:35:28 +01001/*
2 * drivers/mtd/nand/cs553x_nand.c
3 *
4 * (C) 2005, 2006 Red Hat Inc.
5 *
6 * Author: David Woodhouse <dwmw2@infradead.org>
David Woodhouse9d754142006-05-13 04:12:40 +01007 * Tom Sylla <tom.sylla@amd.com>
David Woodhouse179fdc32006-05-11 22:35:28 +01008 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * Overview:
David Woodhousec9ac5972006-11-30 08:17:38 +000014 * This is a device driver for the NAND flash controller found on
David Woodhouse179fdc32006-05-11 22:35:28 +010015 * the AMD CS5535/CS5536 companion chipsets for the Geode processor.
Mart Raudsepp641f4362008-02-09 08:16:36 +000016 * mtd-id for command line partitioning is cs553x_nand_cs[0-3]
17 * where 0-3 reflects the chip select for NAND.
David Woodhouse179fdc32006-05-11 22:35:28 +010018 *
19 */
20
Mart Raudsepp641f4362008-02-09 08:16:36 +000021#include <linux/kernel.h>
David Woodhouse179fdc32006-05-11 22:35:28 +010022#include <linux/slab.h>
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/delay.h>
David Woodhouse179fdc32006-05-11 22:35:28 +010026#include <linux/mtd/mtd.h>
27#include <linux/mtd/nand.h>
David Woodhouse9d754142006-05-13 04:12:40 +010028#include <linux/mtd/nand_ecc.h>
David Woodhouse179fdc32006-05-11 22:35:28 +010029#include <linux/mtd/partitions.h>
30
31#include <asm/msr.h>
32#include <asm/io.h>
33
34#define NR_CS553X_CONTROLLERS 4
35
David Woodhousee4d222f2006-05-26 02:06:27 +010036#define MSR_DIVIL_GLD_CAP 0x51400000 /* DIVIL capabilitiies */
37#define CAP_CS5535 0x2df000ULL
38#define CAP_CS5536 0x5df500ULL
39
David Woodhouse179fdc32006-05-11 22:35:28 +010040/* NAND Timing MSRs */
41#define MSR_NANDF_DATA 0x5140001b /* NAND Flash Data Timing MSR */
42#define MSR_NANDF_CTL 0x5140001c /* NAND Flash Control Timing */
43#define MSR_NANDF_RSVD 0x5140001d /* Reserved */
44
45/* NAND BAR MSRs */
46#define MSR_DIVIL_LBAR_FLSH0 0x51400010 /* Flash Chip Select 0 */
47#define MSR_DIVIL_LBAR_FLSH1 0x51400011 /* Flash Chip Select 1 */
48#define MSR_DIVIL_LBAR_FLSH2 0x51400012 /* Flash Chip Select 2 */
49#define MSR_DIVIL_LBAR_FLSH3 0x51400013 /* Flash Chip Select 3 */
50 /* Each made up of... */
51#define FLSH_LBAR_EN (1ULL<<32)
52#define FLSH_NOR_NAND (1ULL<<33) /* 1 for NAND */
53#define FLSH_MEM_IO (1ULL<<34) /* 1 for MMIO */
54 /* I/O BARs have BASE_ADDR in bits 15:4, IO_MASK in 47:36 */
55 /* MMIO BARs have BASE_ADDR in bits 31:12, MEM_MASK in 63:44 */
56
57/* Pin function selection MSR (IDE vs. flash on the IDE pins) */
58#define MSR_DIVIL_BALL_OPTS 0x51400015
David Woodhousee0c7d762006-05-13 18:07:53 +010059#define PIN_OPT_IDE (1<<0) /* 0 for flash, 1 for IDE */
David Woodhouse179fdc32006-05-11 22:35:28 +010060
61/* Registers within the NAND flash controller BAR -- memory mapped */
62#define MM_NAND_DATA 0x00 /* 0 to 0x7ff, in fact */
63#define MM_NAND_CTL 0x800 /* Any even address 0x800-0x80e */
64#define MM_NAND_IO 0x801 /* Any odd address 0x801-0x80f */
65#define MM_NAND_STS 0x810
66#define MM_NAND_ECC_LSB 0x811
67#define MM_NAND_ECC_MSB 0x812
68#define MM_NAND_ECC_COL 0x813
69#define MM_NAND_LAC 0x814
70#define MM_NAND_ECC_CTL 0x815
71
72/* Registers within the NAND flash controller BAR -- I/O mapped */
73#define IO_NAND_DATA 0x00 /* 0 to 3, in fact */
74#define IO_NAND_CTL 0x04
75#define IO_NAND_IO 0x05
76#define IO_NAND_STS 0x06
77#define IO_NAND_ECC_CTL 0x08
78#define IO_NAND_ECC_LSB 0x09
79#define IO_NAND_ECC_MSB 0x0a
80#define IO_NAND_ECC_COL 0x0b
81#define IO_NAND_LAC 0x0c
82
83#define CS_NAND_CTL_DIST_EN (1<<4) /* Enable NAND Distract interrupt */
84#define CS_NAND_CTL_RDY_INT_MASK (1<<3) /* Enable RDY/BUSY# interrupt */
85#define CS_NAND_CTL_ALE (1<<2)
86#define CS_NAND_CTL_CLE (1<<1)
87#define CS_NAND_CTL_CE (1<<0) /* Keep low; 1 to reset */
88
89#define CS_NAND_STS_FLASH_RDY (1<<3)
90#define CS_NAND_CTLR_BUSY (1<<2)
91#define CS_NAND_CMD_COMP (1<<1)
92#define CS_NAND_DIST_ST (1<<0)
93
94#define CS_NAND_ECC_PARITY (1<<2)
95#define CS_NAND_ECC_CLRECC (1<<1)
96#define CS_NAND_ECC_ENECC (1<<0)
97
David Woodhouse9d754142006-05-13 04:12:40 +010098static void cs553x_read_buf(struct mtd_info *mtd, u_char *buf, int len)
99{
100 struct nand_chip *this = mtd->priv;
101
102 while (unlikely(len > 0x800)) {
103 memcpy_fromio(buf, this->IO_ADDR_R, 0x800);
104 buf += 0x800;
105 len -= 0x800;
106 }
107 memcpy_fromio(buf, this->IO_ADDR_R, len);
108}
109
110static void cs553x_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
111{
112 struct nand_chip *this = mtd->priv;
113
114 while (unlikely(len > 0x800)) {
115 memcpy_toio(this->IO_ADDR_R, buf, 0x800);
116 buf += 0x800;
117 len -= 0x800;
118 }
119 memcpy_toio(this->IO_ADDR_R, buf, len);
120}
121
David Woodhouse179fdc32006-05-11 22:35:28 +0100122static unsigned char cs553x_read_byte(struct mtd_info *mtd)
123{
124 struct nand_chip *this = mtd->priv;
David Woodhouse9d754142006-05-13 04:12:40 +0100125 return readb(this->IO_ADDR_R);
David Woodhouse179fdc32006-05-11 22:35:28 +0100126}
127
128static void cs553x_write_byte(struct mtd_info *mtd, u_char byte)
129{
130 struct nand_chip *this = mtd->priv;
131 int i = 100000;
132
133 while (i && readb(this->IO_ADDR_R + MM_NAND_STS) & CS_NAND_CTLR_BUSY) {
134 udelay(1);
135 i--;
136 }
David Woodhousee0c7d762006-05-13 18:07:53 +0100137 writeb(byte, this->IO_ADDR_W + 0x801);
David Woodhouse179fdc32006-05-11 22:35:28 +0100138}
139
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200140static void cs553x_hwcontrol(struct mtd_info *mtd, int cmd,
141 unsigned int ctrl)
David Woodhouse179fdc32006-05-11 22:35:28 +0100142{
143 struct nand_chip *this = mtd->priv;
144 void __iomem *mmio_base = this->IO_ADDR_R;
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200145 if (ctrl & NAND_CTRL_CHANGE) {
146 unsigned char ctl = (ctrl & ~NAND_CTRL_CHANGE ) ^ 0x01;
147 writeb(ctl, mmio_base + MM_NAND_CTL);
David Woodhouse179fdc32006-05-11 22:35:28 +0100148 }
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200149 if (cmd != NAND_CMD_NONE)
150 cs553x_write_byte(mtd, cmd);
David Woodhouse179fdc32006-05-11 22:35:28 +0100151}
152
David Woodhouse179fdc32006-05-11 22:35:28 +0100153static int cs553x_device_ready(struct mtd_info *mtd)
154{
155 struct nand_chip *this = mtd->priv;
156 void __iomem *mmio_base = this->IO_ADDR_R;
157 unsigned char foo = readb(mmio_base + MM_NAND_STS);
158
David Woodhousee0c7d762006-05-13 18:07:53 +0100159 return (foo & CS_NAND_STS_FLASH_RDY) && !(foo & CS_NAND_CTLR_BUSY);
David Woodhouse179fdc32006-05-11 22:35:28 +0100160}
161
David Woodhouse9d754142006-05-13 04:12:40 +0100162static void cs_enable_hwecc(struct mtd_info *mtd, int mode)
163{
164 struct nand_chip *this = mtd->priv;
165 void __iomem *mmio_base = this->IO_ADDR_R;
166
167 writeb(0x07, mmio_base + MM_NAND_ECC_CTL);
168}
169
170static int cs_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
171{
172 uint32_t ecc;
173 struct nand_chip *this = mtd->priv;
174 void __iomem *mmio_base = this->IO_ADDR_R;
175
176 ecc = readl(mmio_base + MM_NAND_STS);
177
178 ecc_code[1] = ecc >> 8;
179 ecc_code[0] = ecc >> 16;
180 ecc_code[2] = ecc >> 24;
181 return 0;
182}
183
David Woodhouse179fdc32006-05-11 22:35:28 +0100184static struct mtd_info *cs553x_mtd[4];
185
186static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
187{
188 int err = 0;
189 struct nand_chip *this;
190 struct mtd_info *new_mtd;
191
192 printk(KERN_NOTICE "Probing CS553x NAND controller CS#%d at %sIO 0x%08lx\n", cs, mmio?"MM":"P", adr);
193
194 if (!mmio) {
195 printk(KERN_NOTICE "PIO mode not yet implemented for CS553X NAND controller\n");
196 return -ENXIO;
197 }
198
199 /* Allocate memory for MTD device structure and private data */
David Woodhousee0c7d762006-05-13 18:07:53 +0100200 new_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
David Woodhouse179fdc32006-05-11 22:35:28 +0100201 if (!new_mtd) {
202 printk(KERN_WARNING "Unable to allocate CS553X NAND MTD device structure.\n");
203 err = -ENOMEM;
204 goto out;
205 }
206
207 /* Get pointer to private data */
David Woodhousee0c7d762006-05-13 18:07:53 +0100208 this = (struct nand_chip *)(&new_mtd[1]);
David Woodhouse179fdc32006-05-11 22:35:28 +0100209
210 /* Initialize structures */
David Woodhouse9d754142006-05-13 04:12:40 +0100211 memset(new_mtd, 0, sizeof(struct mtd_info));
212 memset(this, 0, sizeof(struct nand_chip));
David Woodhouse179fdc32006-05-11 22:35:28 +0100213
214 /* Link the private data with the MTD structure */
215 new_mtd->priv = this;
David Woodhouse552d9202006-05-14 01:20:46 +0100216 new_mtd->owner = THIS_MODULE;
David Woodhouse179fdc32006-05-11 22:35:28 +0100217
218 /* map physical address */
219 this->IO_ADDR_R = this->IO_ADDR_W = ioremap(adr, 4096);
220 if (!this->IO_ADDR_R) {
221 printk(KERN_WARNING "ioremap cs553x NAND @0x%08lx failed\n", adr);
222 err = -EIO;
223 goto out_mtd;
224 }
225
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200226 this->cmd_ctrl = cs553x_hwcontrol;
David Woodhouse179fdc32006-05-11 22:35:28 +0100227 this->dev_ready = cs553x_device_ready;
228 this->read_byte = cs553x_read_byte;
David Woodhouse9d754142006-05-13 04:12:40 +0100229 this->read_buf = cs553x_read_buf;
230 this->write_buf = cs553x_write_buf;
David Woodhouse179fdc32006-05-11 22:35:28 +0100231
David Woodhouse9d754142006-05-13 04:12:40 +0100232 this->chip_delay = 0;
David Woodhouse179fdc32006-05-11 22:35:28 +0100233
Thomas Gleixner6dfc6d22006-05-23 12:00:46 +0200234 this->ecc.mode = NAND_ECC_HW;
235 this->ecc.size = 256;
236 this->ecc.bytes = 3;
237 this->ecc.hwctl = cs_enable_hwecc;
238 this->ecc.calculate = cs_calculate_ecc;
239 this->ecc.correct = nand_correct_data;
240
David Woodhouse179fdc32006-05-11 22:35:28 +0100241 /* Enable the following for a flash based bad block table */
David Woodhouse9d754142006-05-13 04:12:40 +0100242 this->options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR;
David Woodhouse179fdc32006-05-11 22:35:28 +0100243
244 /* Scan to find existance of the device */
David Woodhouse9d754142006-05-13 04:12:40 +0100245 if (nand_scan(new_mtd, 1)) {
David Woodhouse179fdc32006-05-11 22:35:28 +0100246 err = -ENXIO;
247 goto out_ior;
248 }
249
Mart Raudsepp641f4362008-02-09 08:16:36 +0000250 new_mtd->name = kasprintf(GFP_KERNEL, "cs553x_nand_cs%d", cs);
251
David Woodhouse179fdc32006-05-11 22:35:28 +0100252 cs553x_mtd[cs] = new_mtd;
253 goto out;
254
255out_ior:
Al Viroafc12d32006-10-10 22:46:37 +0100256 iounmap(this->IO_ADDR_R);
David Woodhouse179fdc32006-05-11 22:35:28 +0100257out_mtd:
David Woodhouse9d754142006-05-13 04:12:40 +0100258 kfree(new_mtd);
David Woodhouse179fdc32006-05-11 22:35:28 +0100259out:
260 return err;
261}
262
David Woodhousee4d222f2006-05-26 02:06:27 +0100263static int is_geode(void)
264{
265 /* These are the CPUs which will have a CS553[56] companion chip */
266 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
267 boot_cpu_data.x86 == 5 &&
268 boot_cpu_data.x86_model == 10)
269 return 1; /* Geode LX */
270
271 if ((boot_cpu_data.x86_vendor == X86_VENDOR_NSC ||
272 boot_cpu_data.x86_vendor == X86_VENDOR_CYRIX) &&
273 boot_cpu_data.x86 == 5 &&
274 boot_cpu_data.x86_model == 5)
275 return 1; /* Geode GX (née GX2) */
276
277 return 0;
278}
279
Mart Raudsepp641f4362008-02-09 08:16:36 +0000280
281#ifdef CONFIG_MTD_PARTITIONS
Adrian Bunkec12cc74e2008-04-18 13:44:12 -0700282static const char *part_probes[] = { "cmdlinepart", NULL };
Mart Raudsepp641f4362008-02-09 08:16:36 +0000283#endif
284
285
David Woodhousecead4db2006-05-16 13:54:50 +0100286static int __init cs553x_init(void)
David Woodhouse179fdc32006-05-11 22:35:28 +0100287{
288 int err = -ENXIO;
289 int i;
290 uint64_t val;
291
Manish Katiyar6b852022008-10-14 23:43:29 +0530292#ifdef CONFIG_MTD_PARTITIONS
Mart Raudsepp641f4362008-02-09 08:16:36 +0000293 int mtd_parts_nb = 0;
294 struct mtd_partition *mtd_parts = NULL;
Manish Katiyar6b852022008-10-14 23:43:29 +0530295#endif
Mart Raudsepp641f4362008-02-09 08:16:36 +0000296
David Woodhousee4d222f2006-05-26 02:06:27 +0100297 /* If the CPU isn't a Geode GX or LX, abort */
298 if (!is_geode())
David Woodhouse179fdc32006-05-11 22:35:28 +0100299 return -ENXIO;
300
David Woodhousee4d222f2006-05-26 02:06:27 +0100301 /* If it doesn't have the CS553[56], abort */
302 rdmsrl(MSR_DIVIL_GLD_CAP, val);
303 val &= ~0xFFULL;
304 if (val != CAP_CS5535 && val != CAP_CS5536)
305 return -ENXIO;
306
307 /* If it doesn't have the NAND controller enabled, abort */
David Woodhouse179fdc32006-05-11 22:35:28 +0100308 rdmsrl(MSR_DIVIL_BALL_OPTS, val);
Mart Raudsepp641f4362008-02-09 08:16:36 +0000309 if (val & PIN_OPT_IDE) {
David Woodhouse179fdc32006-05-11 22:35:28 +0100310 printk(KERN_INFO "CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n");
311 return -ENXIO;
312 }
313
David Woodhousee0c7d762006-05-13 18:07:53 +0100314 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
315 rdmsrl(MSR_DIVIL_LBAR_FLSH0 + i, val);
David Woodhouse179fdc32006-05-11 22:35:28 +0100316
317 if ((val & (FLSH_LBAR_EN|FLSH_NOR_NAND)) == (FLSH_LBAR_EN|FLSH_NOR_NAND))
318 err = cs553x_init_one(i, !!(val & FLSH_MEM_IO), val & 0xFFFFFFFF);
319 }
David Woodhousee0c7d762006-05-13 18:07:53 +0100320
David Woodhousec9ac5972006-11-30 08:17:38 +0000321 /* Register all devices together here. This means we can easily hack it to
David Woodhouse179fdc32006-05-11 22:35:28 +0100322 do mtdconcat etc. if we want to. */
David Woodhousee0c7d762006-05-13 18:07:53 +0100323 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
David Woodhouse179fdc32006-05-11 22:35:28 +0100324 if (cs553x_mtd[i]) {
David Woodhouse179fdc32006-05-11 22:35:28 +0100325
326 /* If any devices registered, return success. Else the last error. */
Mart Raudsepp641f4362008-02-09 08:16:36 +0000327#ifdef CONFIG_MTD_PARTITIONS
328 mtd_parts_nb = parse_mtd_partitions(cs553x_mtd[i], part_probes, &mtd_parts, 0);
329 if (mtd_parts_nb > 0) {
330 printk(KERN_NOTICE "Using command line partition definition\n");
331 add_mtd_partitions(cs553x_mtd[i], mtd_parts, mtd_parts_nb);
332 } else {
333 add_mtd_device(cs553x_mtd[i]);
334 }
335#else
336 add_mtd_device(cs553x_mtd[i]);
337#endif
David Woodhouse179fdc32006-05-11 22:35:28 +0100338 err = 0;
339 }
340 }
341
342 return err;
343}
David Woodhousee0c7d762006-05-13 18:07:53 +0100344
David Woodhouse179fdc32006-05-11 22:35:28 +0100345module_init(cs553x_init);
346
David Woodhousee0c7d762006-05-13 18:07:53 +0100347static void __exit cs553x_cleanup(void)
David Woodhouse179fdc32006-05-11 22:35:28 +0100348{
349 int i;
350
David Woodhousee0c7d762006-05-13 18:07:53 +0100351 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
David Woodhouse179fdc32006-05-11 22:35:28 +0100352 struct mtd_info *mtd = cs553x_mtd[i];
353 struct nand_chip *this;
354 void __iomem *mmio_base;
355
356 if (!mtd)
Mart Raudsepp641f4362008-02-09 08:16:36 +0000357 continue;
David Woodhouse179fdc32006-05-11 22:35:28 +0100358
359 this = cs553x_mtd[i]->priv;
360 mmio_base = this->IO_ADDR_R;
361
362 /* Release resources, unregister device */
David Woodhousee0c7d762006-05-13 18:07:53 +0100363 nand_release(cs553x_mtd[i]);
Mart Raudsepp641f4362008-02-09 08:16:36 +0000364 kfree(cs553x_mtd[i]->name);
David Woodhouse179fdc32006-05-11 22:35:28 +0100365 cs553x_mtd[i] = NULL;
366
Joe Perches8e87d782008-02-03 17:22:34 +0200367 /* unmap physical address */
David Woodhouse179fdc32006-05-11 22:35:28 +0100368 iounmap(mmio_base);
369
370 /* Free the MTD device structure */
David Woodhouse9d754142006-05-13 04:12:40 +0100371 kfree(mtd);
David Woodhouse179fdc32006-05-11 22:35:28 +0100372 }
373}
David Woodhousee0c7d762006-05-13 18:07:53 +0100374
David Woodhouse179fdc32006-05-11 22:35:28 +0100375module_exit(cs553x_cleanup);
376
377MODULE_LICENSE("GPL");
378MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
379MODULE_DESCRIPTION("NAND controller driver for AMD CS5535/CS5536 companion chip");