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1/*
2 * drivers/mtd/nand/cs553x_nand.c
3 *
4 * (C) 2005, 2006 Red Hat Inc.
5 *
6 * Author: David Woodhouse <dwmw2@infradead.org>
7 * Tom Sylla <tom.sylla@amd.com>
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:
14 * This is a device driver for the NAND flash controller found on
15 * the AMD CS5535/CS5536 companion chipsets for the Geode processor.
16 * mtd-id for command line partitioning is cs553x_nand_cs[0-3]
17 * where 0-3 reflects the chip select for NAND.
18 *
19 */
20
21#include <linux/kernel.h>
22#include <linux/slab.h>
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/delay.h>
26#include <linux/mtd/mtd.h>
27#include <linux/mtd/nand.h>
28#include <linux/mtd/nand_ecc.h>
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
36#define MSR_DIVIL_GLD_CAP 0x51400000 /* DIVIL capabilitiies */
37#define CAP_CS5535 0x2df000ULL
38#define CAP_CS5536 0x5df500ULL
39
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
59#define PIN_OPT_IDE (1<<0) /* 0 for flash, 1 for IDE */
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
98static void cs553x_read_buf(struct mtd_info *mtd, u_char *buf, int len)
99{
100 struct nand_chip *this = mtd_to_nand(mtd);
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_to_nand(mtd);
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
122static unsigned char cs553x_read_byte(struct mtd_info *mtd)
123{
124 struct nand_chip *this = mtd_to_nand(mtd);
125 return readb(this->IO_ADDR_R);
126}
127
128static void cs553x_write_byte(struct mtd_info *mtd, u_char byte)
129{
130 struct nand_chip *this = mtd_to_nand(mtd);
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 }
137 writeb(byte, this->IO_ADDR_W + 0x801);
138}
139
140static void cs553x_hwcontrol(struct mtd_info *mtd, int cmd,
141 unsigned int ctrl)
142{
143 struct nand_chip *this = mtd_to_nand(mtd);
144 void __iomem *mmio_base = this->IO_ADDR_R;
145 if (ctrl & NAND_CTRL_CHANGE) {
146 unsigned char ctl = (ctrl & ~NAND_CTRL_CHANGE ) ^ 0x01;
147 writeb(ctl, mmio_base + MM_NAND_CTL);
148 }
149 if (cmd != NAND_CMD_NONE)
150 cs553x_write_byte(mtd, cmd);
151}
152
153static int cs553x_device_ready(struct mtd_info *mtd)
154{
155 struct nand_chip *this = mtd_to_nand(mtd);
156 void __iomem *mmio_base = this->IO_ADDR_R;
157 unsigned char foo = readb(mmio_base + MM_NAND_STS);
158
159 return (foo & CS_NAND_STS_FLASH_RDY) && !(foo & CS_NAND_CTLR_BUSY);
160}
161
162static void cs_enable_hwecc(struct mtd_info *mtd, int mode)
163{
164 struct nand_chip *this = mtd_to_nand(mtd);
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_to_nand(mtd);
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
184static 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 */
200 this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
201 if (!this) {
202 err = -ENOMEM;
203 goto out;
204 }
205
206 new_mtd = nand_to_mtd(this);
207
208 /* Link the private data with the MTD structure */
209 new_mtd->owner = THIS_MODULE;
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
219 this->cmd_ctrl = cs553x_hwcontrol;
220 this->dev_ready = cs553x_device_ready;
221 this->read_byte = cs553x_read_byte;
222 this->read_buf = cs553x_read_buf;
223 this->write_buf = cs553x_write_buf;
224
225 this->chip_delay = 0;
226
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;
233 this->ecc.strength = 1;
234
235 /* Enable the following for a flash based bad block table */
236 this->bbt_options = NAND_BBT_USE_FLASH;
237
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
244 /* Scan to find existence of the device */
245 err = nand_scan(new_mtd, 1);
246 if (err)
247 goto out_free;
248
249 cs553x_mtd[cs] = new_mtd;
250 goto out;
251
252out_free:
253 kfree(new_mtd->name);
254out_ior:
255 iounmap(this->IO_ADDR_R);
256out_mtd:
257 kfree(this);
258out:
259 return err;
260}
261
262static 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
279static int __init cs553x_init(void)
280{
281 int err = -ENXIO;
282 int i;
283 uint64_t val;
284
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)
293 return -ENXIO;
294
295 /* If it doesn't have the NAND controller enabled, abort */
296 rdmsrl(MSR_DIVIL_BALL_OPTS, val);
297 if (val & PIN_OPT_IDE) {
298 printk(KERN_INFO "CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n");
299 return -ENXIO;
300 }
301
302 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
303 rdmsrl(MSR_DIVIL_LBAR_FLSH0 + i, val);
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 }
308
309 /* Register all devices together here. This means we can easily hack it to
310 do mtdconcat etc. if we want to. */
311 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
312 if (cs553x_mtd[i]) {
313 /* If any devices registered, return success. Else the last error. */
314 mtd_device_parse_register(cs553x_mtd[i], NULL, NULL,
315 NULL, 0);
316 err = 0;
317 }
318 }
319
320 return err;
321}
322
323module_init(cs553x_init);
324
325static void __exit cs553x_cleanup(void)
326{
327 int i;
328
329 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
330 struct mtd_info *mtd = cs553x_mtd[i];
331 struct nand_chip *this;
332 void __iomem *mmio_base;
333
334 if (!mtd)
335 continue;
336
337 this = mtd_to_nand(mtd);
338 mmio_base = this->IO_ADDR_R;
339
340 /* Release resources, unregister device */
341 nand_release(mtd);
342 kfree(mtd->name);
343 cs553x_mtd[i] = NULL;
344
345 /* unmap physical address */
346 iounmap(mmio_base);
347
348 /* Free the MTD device structure */
349 kfree(this);
350 }
351}
352
353module_exit(cs553x_cleanup);
354
355MODULE_LICENSE("GPL");
356MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
357MODULE_DESCRIPTION("NAND controller driver for AMD CS5535/CS5536 companion chip");