2 * drivers/mtd/nand/cs553x_nand.c
4 * (C) 2005, 2006 Red Hat Inc.
6 * Author: David Woodhouse <dwmw2@infradead.org>
7 * Tom Sylla <tom.sylla@amd.com>
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.
14 * This is a device driver for the NAND flash controller found on
15 * the AMD CS5535/CS5536 companion chipsets for the Geode processor.
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/delay.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/nand.h>
25 #include <linux/mtd/nand_ecc.h>
26 #include <linux/mtd/partitions.h>
31 #define NR_CS553X_CONTROLLERS 4
33 #define MSR_DIVIL_GLD_CAP 0x51400000 /* DIVIL capabilitiies */
34 #define CAP_CS5535 0x2df000ULL
35 #define CAP_CS5536 0x5df500ULL
37 /* NAND Timing MSRs */
38 #define MSR_NANDF_DATA 0x5140001b /* NAND Flash Data Timing MSR */
39 #define MSR_NANDF_CTL 0x5140001c /* NAND Flash Control Timing */
40 #define MSR_NANDF_RSVD 0x5140001d /* Reserved */
43 #define MSR_DIVIL_LBAR_FLSH0 0x51400010 /* Flash Chip Select 0 */
44 #define MSR_DIVIL_LBAR_FLSH1 0x51400011 /* Flash Chip Select 1 */
45 #define MSR_DIVIL_LBAR_FLSH2 0x51400012 /* Flash Chip Select 2 */
46 #define MSR_DIVIL_LBAR_FLSH3 0x51400013 /* Flash Chip Select 3 */
47 /* Each made up of... */
48 #define FLSH_LBAR_EN (1ULL<<32)
49 #define FLSH_NOR_NAND (1ULL<<33) /* 1 for NAND */
50 #define FLSH_MEM_IO (1ULL<<34) /* 1 for MMIO */
51 /* I/O BARs have BASE_ADDR in bits 15:4, IO_MASK in 47:36 */
52 /* MMIO BARs have BASE_ADDR in bits 31:12, MEM_MASK in 63:44 */
54 /* Pin function selection MSR (IDE vs. flash on the IDE pins) */
55 #define MSR_DIVIL_BALL_OPTS 0x51400015
56 #define PIN_OPT_IDE (1<<0) /* 0 for flash, 1 for IDE */
58 /* Registers within the NAND flash controller BAR -- memory mapped */
59 #define MM_NAND_DATA 0x00 /* 0 to 0x7ff, in fact */
60 #define MM_NAND_CTL 0x800 /* Any even address 0x800-0x80e */
61 #define MM_NAND_IO 0x801 /* Any odd address 0x801-0x80f */
62 #define MM_NAND_STS 0x810
63 #define MM_NAND_ECC_LSB 0x811
64 #define MM_NAND_ECC_MSB 0x812
65 #define MM_NAND_ECC_COL 0x813
66 #define MM_NAND_LAC 0x814
67 #define MM_NAND_ECC_CTL 0x815
69 /* Registers within the NAND flash controller BAR -- I/O mapped */
70 #define IO_NAND_DATA 0x00 /* 0 to 3, in fact */
71 #define IO_NAND_CTL 0x04
72 #define IO_NAND_IO 0x05
73 #define IO_NAND_STS 0x06
74 #define IO_NAND_ECC_CTL 0x08
75 #define IO_NAND_ECC_LSB 0x09
76 #define IO_NAND_ECC_MSB 0x0a
77 #define IO_NAND_ECC_COL 0x0b
78 #define IO_NAND_LAC 0x0c
80 #define CS_NAND_CTL_DIST_EN (1<<4) /* Enable NAND Distract interrupt */
81 #define CS_NAND_CTL_RDY_INT_MASK (1<<3) /* Enable RDY/BUSY# interrupt */
82 #define CS_NAND_CTL_ALE (1<<2)
83 #define CS_NAND_CTL_CLE (1<<1)
84 #define CS_NAND_CTL_CE (1<<0) /* Keep low; 1 to reset */
86 #define CS_NAND_STS_FLASH_RDY (1<<3)
87 #define CS_NAND_CTLR_BUSY (1<<2)
88 #define CS_NAND_CMD_COMP (1<<1)
89 #define CS_NAND_DIST_ST (1<<0)
91 #define CS_NAND_ECC_PARITY (1<<2)
92 #define CS_NAND_ECC_CLRECC (1<<1)
93 #define CS_NAND_ECC_ENECC (1<<0)
95 static void cs553x_read_buf(struct mtd_info *mtd, u_char *buf, int len)
97 struct nand_chip *this = mtd->priv;
99 while (unlikely(len > 0x800)) {
100 memcpy_fromio(buf, this->IO_ADDR_R, 0x800);
104 memcpy_fromio(buf, this->IO_ADDR_R, len);
107 static void cs553x_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
109 struct nand_chip *this = mtd->priv;
111 while (unlikely(len > 0x800)) {
112 memcpy_toio(this->IO_ADDR_R, buf, 0x800);
116 memcpy_toio(this->IO_ADDR_R, buf, len);
119 static unsigned char cs553x_read_byte(struct mtd_info *mtd)
121 struct nand_chip *this = mtd->priv;
122 return readb(this->IO_ADDR_R);
125 static void cs553x_write_byte(struct mtd_info *mtd, u_char byte)
127 struct nand_chip *this = mtd->priv;
130 while (i && readb(this->IO_ADDR_R + MM_NAND_STS) & CS_NAND_CTLR_BUSY) {
134 writeb(byte, this->IO_ADDR_W + 0x801);
137 static void cs553x_hwcontrol(struct mtd_info *mtd, int cmd,
140 struct nand_chip *this = mtd->priv;
141 void __iomem *mmio_base = this->IO_ADDR_R;
142 if (ctrl & NAND_CTRL_CHANGE) {
143 unsigned char ctl = (ctrl & ~NAND_CTRL_CHANGE ) ^ 0x01;
144 writeb(ctl, mmio_base + MM_NAND_CTL);
146 if (cmd != NAND_CMD_NONE)
147 cs553x_write_byte(mtd, cmd);
150 static int cs553x_device_ready(struct mtd_info *mtd)
152 struct nand_chip *this = mtd->priv;
153 void __iomem *mmio_base = this->IO_ADDR_R;
154 unsigned char foo = readb(mmio_base + MM_NAND_STS);
156 return (foo & CS_NAND_STS_FLASH_RDY) && !(foo & CS_NAND_CTLR_BUSY);
159 static void cs_enable_hwecc(struct mtd_info *mtd, int mode)
161 struct nand_chip *this = mtd->priv;
162 void __iomem *mmio_base = this->IO_ADDR_R;
164 writeb(0x07, mmio_base + MM_NAND_ECC_CTL);
167 static int cs_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
170 struct nand_chip *this = mtd->priv;
171 void __iomem *mmio_base = this->IO_ADDR_R;
173 ecc = readl(mmio_base + MM_NAND_STS);
175 ecc_code[1] = ecc >> 8;
176 ecc_code[0] = ecc >> 16;
177 ecc_code[2] = ecc >> 24;
181 static struct mtd_info *cs553x_mtd[4];
183 static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
186 struct nand_chip *this;
187 struct mtd_info *new_mtd;
189 printk(KERN_NOTICE "Probing CS553x NAND controller CS#%d at %sIO 0x%08lx\n", cs, mmio?"MM":"P", adr);
192 printk(KERN_NOTICE "PIO mode not yet implemented for CS553X NAND controller\n");
196 /* Allocate memory for MTD device structure and private data */
197 new_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
199 printk(KERN_WARNING "Unable to allocate CS553X NAND MTD device structure.\n");
204 /* Get pointer to private data */
205 this = (struct nand_chip *)(&new_mtd[1]);
207 /* Initialize structures */
208 memset(new_mtd, 0, sizeof(struct mtd_info));
209 memset(this, 0, sizeof(struct nand_chip));
211 /* Link the private data with the MTD structure */
212 new_mtd->priv = this;
213 new_mtd->owner = THIS_MODULE;
215 /* map physical address */
216 this->IO_ADDR_R = this->IO_ADDR_W = ioremap(adr, 4096);
217 if (!this->IO_ADDR_R) {
218 printk(KERN_WARNING "ioremap cs553x NAND @0x%08lx failed\n", adr);
223 this->cmd_ctrl = cs553x_hwcontrol;
224 this->dev_ready = cs553x_device_ready;
225 this->read_byte = cs553x_read_byte;
226 this->read_buf = cs553x_read_buf;
227 this->write_buf = cs553x_write_buf;
229 this->chip_delay = 0;
231 this->ecc.mode = NAND_ECC_HW;
232 this->ecc.size = 256;
234 this->ecc.hwctl = cs_enable_hwecc;
235 this->ecc.calculate = cs_calculate_ecc;
236 this->ecc.correct = nand_correct_data;
238 /* Enable the following for a flash based bad block table */
239 this->options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR;
241 /* Scan to find existance of the device */
242 if (nand_scan(new_mtd, 1)) {
247 cs553x_mtd[cs] = new_mtd;
251 iounmap(this->IO_ADDR_R);
258 static int is_geode(void)
260 /* These are the CPUs which will have a CS553[56] companion chip */
261 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
262 boot_cpu_data.x86 == 5 &&
263 boot_cpu_data.x86_model == 10)
264 return 1; /* Geode LX */
266 if ((boot_cpu_data.x86_vendor == X86_VENDOR_NSC ||
267 boot_cpu_data.x86_vendor == X86_VENDOR_CYRIX) &&
268 boot_cpu_data.x86 == 5 &&
269 boot_cpu_data.x86_model == 5)
270 return 1; /* Geode GX (née GX2) */
275 static int __init cs553x_init(void)
281 /* If the CPU isn't a Geode GX or LX, abort */
285 /* If it doesn't have the CS553[56], abort */
286 rdmsrl(MSR_DIVIL_GLD_CAP, val);
288 if (val != CAP_CS5535 && val != CAP_CS5536)
291 /* If it doesn't have the NAND controller enabled, abort */
292 rdmsrl(MSR_DIVIL_BALL_OPTS, val);
294 printk(KERN_INFO "CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n");
298 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
299 rdmsrl(MSR_DIVIL_LBAR_FLSH0 + i, val);
301 if ((val & (FLSH_LBAR_EN|FLSH_NOR_NAND)) == (FLSH_LBAR_EN|FLSH_NOR_NAND))
302 err = cs553x_init_one(i, !!(val & FLSH_MEM_IO), val & 0xFFFFFFFF);
305 /* Register all devices together here. This means we can easily hack it to
306 do mtdconcat etc. if we want to. */
307 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
309 add_mtd_device(cs553x_mtd[i]);
311 /* If any devices registered, return success. Else the last error. */
319 module_init(cs553x_init);
321 static void __exit cs553x_cleanup(void)
325 for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
326 struct mtd_info *mtd = cs553x_mtd[i];
327 struct nand_chip *this;
328 void __iomem *mmio_base;
333 this = cs553x_mtd[i]->priv;
334 mmio_base = this->IO_ADDR_R;
336 /* Release resources, unregister device */
337 nand_release(cs553x_mtd[i]);
338 cs553x_mtd[i] = NULL;
340 /* unmap physical address */
343 /* Free the MTD device structure */
348 module_exit(cs553x_cleanup);
350 MODULE_LICENSE("GPL");
351 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
352 MODULE_DESCRIPTION("NAND controller driver for AMD CS5535/CS5536 companion chip");