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Commit | Line | Data |
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179fdc3f DW |
1 | /* |
2 | * drivers/mtd/nand/cs553x_nand.c | |
3 | * | |
4 | * (C) 2005, 2006 Red Hat Inc. | |
5 | * | |
6 | * Author: David Woodhouse <dwmw2@infradead.org> | |
9d75414b | 7 | * Tom Sylla <tom.sylla@amd.com> |
179fdc3f DW |
8 | * |
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: | |
c9ac5977 | 14 | * This is a device driver for the NAND flash controller found on |
179fdc3f | 15 | * the AMD CS5535/CS5536 companion chipsets for the Geode processor. |
641f4366 MR |
16 | * mtd-id for command line partitioning is cs553x_nand_cs[0-3] |
17 | * where 0-3 reflects the chip select for NAND. | |
179fdc3f DW |
18 | * |
19 | */ | |
20 | ||
641f4366 | 21 | #include <linux/kernel.h> |
179fdc3f DW |
22 | #include <linux/slab.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/delay.h> | |
179fdc3f DW |
26 | #include <linux/mtd/mtd.h> |
27 | #include <linux/mtd/nand.h> | |
9d75414b | 28 | #include <linux/mtd/nand_ecc.h> |
179fdc3f DW |
29 | #include <linux/mtd/partitions.h> |
30 | ||
31 | #include <asm/msr.h> | |
32 | #include <asm/io.h> | |
33 | ||
34 | #define NR_CS553X_CONTROLLERS 4 | |
35 | ||
e4d222ff DW |
36 | #define MSR_DIVIL_GLD_CAP 0x51400000 /* DIVIL capabilitiies */ |
37 | #define CAP_CS5535 0x2df000ULL | |
38 | #define CAP_CS5536 0x5df500ULL | |
39 | ||
179fdc3f DW |
40 | /* 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 | |
e0c7d767 | 59 | #define PIN_OPT_IDE (1<<0) /* 0 for flash, 1 for IDE */ |
179fdc3f DW |
60 | |
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 | ||
9d75414b DW |
98 | static void cs553x_read_buf(struct mtd_info *mtd, u_char *buf, int len) |
99 | { | |
4bd4ebcc | 100 | struct nand_chip *this = mtd_to_nand(mtd); |
9d75414b DW |
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 | ||
110 | static void cs553x_write_buf(struct mtd_info *mtd, const u_char *buf, int len) | |
111 | { | |
4bd4ebcc | 112 | struct nand_chip *this = mtd_to_nand(mtd); |
9d75414b DW |
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 | ||
179fdc3f DW |
122 | static unsigned char cs553x_read_byte(struct mtd_info *mtd) |
123 | { | |
4bd4ebcc | 124 | struct nand_chip *this = mtd_to_nand(mtd); |
9d75414b | 125 | return readb(this->IO_ADDR_R); |
179fdc3f DW |
126 | } |
127 | ||
128 | static void cs553x_write_byte(struct mtd_info *mtd, u_char byte) | |
129 | { | |
4bd4ebcc | 130 | struct nand_chip *this = mtd_to_nand(mtd); |
179fdc3f DW |
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 | } | |
e0c7d767 | 137 | writeb(byte, this->IO_ADDR_W + 0x801); |
179fdc3f DW |
138 | } |
139 | ||
7abd3ef9 TG |
140 | static void cs553x_hwcontrol(struct mtd_info *mtd, int cmd, |
141 | unsigned int ctrl) | |
179fdc3f | 142 | { |
4bd4ebcc | 143 | struct nand_chip *this = mtd_to_nand(mtd); |
179fdc3f | 144 | void __iomem *mmio_base = this->IO_ADDR_R; |
7abd3ef9 TG |
145 | if (ctrl & NAND_CTRL_CHANGE) { |
146 | unsigned char ctl = (ctrl & ~NAND_CTRL_CHANGE ) ^ 0x01; | |
147 | writeb(ctl, mmio_base + MM_NAND_CTL); | |
179fdc3f | 148 | } |
7abd3ef9 TG |
149 | if (cmd != NAND_CMD_NONE) |
150 | cs553x_write_byte(mtd, cmd); | |
179fdc3f DW |
151 | } |
152 | ||
179fdc3f DW |
153 | static int cs553x_device_ready(struct mtd_info *mtd) |
154 | { | |
4bd4ebcc | 155 | struct nand_chip *this = mtd_to_nand(mtd); |
179fdc3f DW |
156 | void __iomem *mmio_base = this->IO_ADDR_R; |
157 | unsigned char foo = readb(mmio_base + MM_NAND_STS); | |
158 | ||
e0c7d767 | 159 | return (foo & CS_NAND_STS_FLASH_RDY) && !(foo & CS_NAND_CTLR_BUSY); |
179fdc3f DW |
160 | } |
161 | ||
9d75414b DW |
162 | static void cs_enable_hwecc(struct mtd_info *mtd, int mode) |
163 | { | |
4bd4ebcc | 164 | struct nand_chip *this = mtd_to_nand(mtd); |
9d75414b DW |
165 | void __iomem *mmio_base = this->IO_ADDR_R; |
166 | ||
167 | writeb(0x07, mmio_base + MM_NAND_ECC_CTL); | |
168 | } | |
169 | ||
170 | static int cs_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code) | |
171 | { | |
172 | uint32_t ecc; | |
4bd4ebcc | 173 | struct nand_chip *this = mtd_to_nand(mtd); |
9d75414b DW |
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 | ||
179fdc3f DW |
184 | static struct mtd_info *cs553x_mtd[4]; |
185 | ||
186 | static 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 */ | |
8cd65d1a BB |
200 | this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL); |
201 | if (!this) { | |
179fdc3f DW |
202 | err = -ENOMEM; |
203 | goto out; | |
204 | } | |
205 | ||
8cd65d1a | 206 | new_mtd = nand_to_mtd(this); |
179fdc3f | 207 | |
179fdc3f | 208 | /* Link the private data with the MTD structure */ |
552d9205 | 209 | new_mtd->owner = THIS_MODULE; |
179fdc3f DW |
210 | |
211 | /* map physical address */ | |
212 | this->IO_ADDR_R = this->IO_ADDR_W = ioremap(adr, 4096); | |
213 | if (!this->IO_ADDR_R) { | |
214 | printk(KERN_WARNING "ioremap cs553x NAND @0x%08lx failed\n", adr); | |
215 | err = -EIO; | |
216 | goto out_mtd; | |
217 | } | |
218 | ||
7abd3ef9 | 219 | this->cmd_ctrl = cs553x_hwcontrol; |
179fdc3f DW |
220 | this->dev_ready = cs553x_device_ready; |
221 | this->read_byte = cs553x_read_byte; | |
9d75414b DW |
222 | this->read_buf = cs553x_read_buf; |
223 | this->write_buf = cs553x_write_buf; | |
179fdc3f | 224 | |
9d75414b | 225 | this->chip_delay = 0; |
179fdc3f | 226 | |
6dfc6d25 TG |
227 | this->ecc.mode = NAND_ECC_HW; |
228 | this->ecc.size = 256; | |
229 | this->ecc.bytes = 3; | |
230 | this->ecc.hwctl = cs_enable_hwecc; | |
231 | this->ecc.calculate = cs_calculate_ecc; | |
232 | this->ecc.correct = nand_correct_data; | |
d1f3b65d | 233 | this->ecc.strength = 1; |
6dfc6d25 | 234 | |
179fdc3f | 235 | /* Enable the following for a flash based bad block table */ |
bb9ebd4e | 236 | this->bbt_options = NAND_BBT_USE_FLASH; |
179fdc3f | 237 | |
bc349da0 RW |
238 | new_mtd->name = kasprintf(GFP_KERNEL, "cs553x_nand_cs%d", cs); |
239 | if (!new_mtd->name) { | |
240 | err = -ENOMEM; | |
241 | goto out_ior; | |
242 | } | |
243 | ||
25985edc | 244 | /* Scan to find existence of the device */ |
29453ba4 MY |
245 | err = nand_scan(new_mtd, 1); |
246 | if (err) | |
bc349da0 | 247 | goto out_free; |
179fdc3f DW |
248 | |
249 | cs553x_mtd[cs] = new_mtd; | |
250 | goto out; | |
251 | ||
bc349da0 RW |
252 | out_free: |
253 | kfree(new_mtd->name); | |
179fdc3f | 254 | out_ior: |
afc12d30 | 255 | iounmap(this->IO_ADDR_R); |
179fdc3f | 256 | out_mtd: |
8cd65d1a | 257 | kfree(this); |
179fdc3f DW |
258 | out: |
259 | return err; | |
260 | } | |
261 | ||
e4d222ff DW |
262 | static int is_geode(void) |
263 | { | |
264 | /* These are the CPUs which will have a CS553[56] companion chip */ | |
265 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
266 | boot_cpu_data.x86 == 5 && | |
267 | boot_cpu_data.x86_model == 10) | |
268 | return 1; /* Geode LX */ | |
269 | ||
270 | if ((boot_cpu_data.x86_vendor == X86_VENDOR_NSC || | |
271 | boot_cpu_data.x86_vendor == X86_VENDOR_CYRIX) && | |
272 | boot_cpu_data.x86 == 5 && | |
273 | boot_cpu_data.x86_model == 5) | |
274 | return 1; /* Geode GX (née GX2) */ | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
cead4dbc | 279 | static int __init cs553x_init(void) |
179fdc3f DW |
280 | { |
281 | int err = -ENXIO; | |
282 | int i; | |
283 | uint64_t val; | |
641f4366 | 284 | |
e4d222ff DW |
285 | /* If the CPU isn't a Geode GX or LX, abort */ |
286 | if (!is_geode()) | |
287 | return -ENXIO; | |
288 | ||
289 | /* If it doesn't have the CS553[56], abort */ | |
290 | rdmsrl(MSR_DIVIL_GLD_CAP, val); | |
291 | val &= ~0xFFULL; | |
292 | if (val != CAP_CS5535 && val != CAP_CS5536) | |
179fdc3f DW |
293 | return -ENXIO; |
294 | ||
e4d222ff | 295 | /* If it doesn't have the NAND controller enabled, abort */ |
179fdc3f | 296 | rdmsrl(MSR_DIVIL_BALL_OPTS, val); |
641f4366 | 297 | if (val & PIN_OPT_IDE) { |
179fdc3f DW |
298 | printk(KERN_INFO "CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n"); |
299 | return -ENXIO; | |
300 | } | |
301 | ||
e0c7d767 DW |
302 | for (i = 0; i < NR_CS553X_CONTROLLERS; i++) { |
303 | rdmsrl(MSR_DIVIL_LBAR_FLSH0 + i, val); | |
179fdc3f DW |
304 | |
305 | if ((val & (FLSH_LBAR_EN|FLSH_NOR_NAND)) == (FLSH_LBAR_EN|FLSH_NOR_NAND)) | |
306 | err = cs553x_init_one(i, !!(val & FLSH_MEM_IO), val & 0xFFFFFFFF); | |
307 | } | |
e0c7d767 | 308 | |
c9ac5977 | 309 | /* Register all devices together here. This means we can easily hack it to |
179fdc3f | 310 | do mtdconcat etc. if we want to. */ |
e0c7d767 | 311 | for (i = 0; i < NR_CS553X_CONTROLLERS; i++) { |
179fdc3f | 312 | if (cs553x_mtd[i]) { |
179fdc3f | 313 | /* If any devices registered, return success. Else the last error. */ |
42d7fbe2 | 314 | mtd_device_parse_register(cs553x_mtd[i], NULL, NULL, |
bbd86c9c | 315 | NULL, 0); |
179fdc3f DW |
316 | err = 0; |
317 | } | |
318 | } | |
319 | ||
320 | return err; | |
321 | } | |
e0c7d767 | 322 | |
179fdc3f DW |
323 | module_init(cs553x_init); |
324 | ||
e0c7d767 | 325 | static void __exit cs553x_cleanup(void) |
179fdc3f DW |
326 | { |
327 | int i; | |
328 | ||
e0c7d767 | 329 | for (i = 0; i < NR_CS553X_CONTROLLERS; i++) { |
179fdc3f DW |
330 | struct mtd_info *mtd = cs553x_mtd[i]; |
331 | struct nand_chip *this; | |
332 | void __iomem *mmio_base; | |
333 | ||
334 | if (!mtd) | |
641f4366 | 335 | continue; |
179fdc3f | 336 | |
8cd65d1a | 337 | this = mtd_to_nand(mtd); |
179fdc3f DW |
338 | mmio_base = this->IO_ADDR_R; |
339 | ||
340 | /* Release resources, unregister device */ | |
8cd65d1a BB |
341 | nand_release(mtd); |
342 | kfree(mtd->name); | |
179fdc3f DW |
343 | cs553x_mtd[i] = NULL; |
344 | ||
8e87d782 | 345 | /* unmap physical address */ |
179fdc3f DW |
346 | iounmap(mmio_base); |
347 | ||
348 | /* Free the MTD device structure */ | |
8cd65d1a | 349 | kfree(this); |
179fdc3f DW |
350 | } |
351 | } | |
e0c7d767 | 352 | |
179fdc3f DW |
353 | module_exit(cs553x_cleanup); |
354 | ||
355 | MODULE_LICENSE("GPL"); | |
356 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
357 | MODULE_DESCRIPTION("NAND controller driver for AMD CS5535/CS5536 companion chip"); |