diff options
Diffstat (limited to 'drivers/mtd/nand/raw/cs553x_nand.c')
| -rw-r--r-- | drivers/mtd/nand/raw/cs553x_nand.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/cs553x_nand.c b/drivers/mtd/nand/raw/cs553x_nand.c new file mode 100644 index 000000000..d4be416bb --- /dev/null +++ b/drivers/mtd/nand/raw/cs553x_nand.c @@ -0,0 +1,355 @@ +/* + * (C) 2005, 2006 Red Hat Inc. + * + * Author: David Woodhouse <dwmw2@infradead.org> + * Tom Sylla <tom.sylla@amd.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Overview: + * This is a device driver for the NAND flash controller found on + * the AMD CS5535/CS5536 companion chipsets for the Geode processor. + * mtd-id for command line partitioning is cs553x_nand_cs[0-3] + * where 0-3 reflects the chip select for NAND. + * + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/rawnand.h> +#include <linux/mtd/nand_ecc.h> +#include <linux/mtd/partitions.h> + +#include <asm/msr.h> +#include <asm/io.h> + +#define NR_CS553X_CONTROLLERS 4 + +#define MSR_DIVIL_GLD_CAP 0x51400000 /* DIVIL capabilitiies */ +#define CAP_CS5535 0x2df000ULL +#define CAP_CS5536 0x5df500ULL + +/* NAND Timing MSRs */ +#define MSR_NANDF_DATA 0x5140001b /* NAND Flash Data Timing MSR */ +#define MSR_NANDF_CTL 0x5140001c /* NAND Flash Control Timing */ +#define MSR_NANDF_RSVD 0x5140001d /* Reserved */ + +/* NAND BAR MSRs */ +#define MSR_DIVIL_LBAR_FLSH0 0x51400010 /* Flash Chip Select 0 */ +#define MSR_DIVIL_LBAR_FLSH1 0x51400011 /* Flash Chip Select 1 */ +#define MSR_DIVIL_LBAR_FLSH2 0x51400012 /* Flash Chip Select 2 */ +#define MSR_DIVIL_LBAR_FLSH3 0x51400013 /* Flash Chip Select 3 */ + /* Each made up of... */ +#define FLSH_LBAR_EN (1ULL<<32) +#define FLSH_NOR_NAND (1ULL<<33) /* 1 for NAND */ +#define FLSH_MEM_IO (1ULL<<34) /* 1 for MMIO */ + /* I/O BARs have BASE_ADDR in bits 15:4, IO_MASK in 47:36 */ + /* MMIO BARs have BASE_ADDR in bits 31:12, MEM_MASK in 63:44 */ + +/* Pin function selection MSR (IDE vs. flash on the IDE pins) */ +#define MSR_DIVIL_BALL_OPTS 0x51400015 +#define PIN_OPT_IDE (1<<0) /* 0 for flash, 1 for IDE */ + +/* Registers within the NAND flash controller BAR -- memory mapped */ +#define MM_NAND_DATA 0x00 /* 0 to 0x7ff, in fact */ +#define MM_NAND_CTL 0x800 /* Any even address 0x800-0x80e */ +#define MM_NAND_IO 0x801 /* Any odd address 0x801-0x80f */ +#define MM_NAND_STS 0x810 +#define MM_NAND_ECC_LSB 0x811 +#define MM_NAND_ECC_MSB 0x812 +#define MM_NAND_ECC_COL 0x813 +#define MM_NAND_LAC 0x814 +#define MM_NAND_ECC_CTL 0x815 + +/* Registers within the NAND flash controller BAR -- I/O mapped */ +#define IO_NAND_DATA 0x00 /* 0 to 3, in fact */ +#define IO_NAND_CTL 0x04 +#define IO_NAND_IO 0x05 +#define IO_NAND_STS 0x06 +#define IO_NAND_ECC_CTL 0x08 +#define IO_NAND_ECC_LSB 0x09 +#define IO_NAND_ECC_MSB 0x0a +#define IO_NAND_ECC_COL 0x0b +#define IO_NAND_LAC 0x0c + +#define CS_NAND_CTL_DIST_EN (1<<4) /* Enable NAND Distract interrupt */ +#define CS_NAND_CTL_RDY_INT_MASK (1<<3) /* Enable RDY/BUSY# interrupt */ +#define CS_NAND_CTL_ALE (1<<2) +#define CS_NAND_CTL_CLE (1<<1) +#define CS_NAND_CTL_CE (1<<0) /* Keep low; 1 to reset */ + +#define CS_NAND_STS_FLASH_RDY (1<<3) +#define CS_NAND_CTLR_BUSY (1<<2) +#define CS_NAND_CMD_COMP (1<<1) +#define CS_NAND_DIST_ST (1<<0) + +#define CS_NAND_ECC_PARITY (1<<2) +#define CS_NAND_ECC_CLRECC (1<<1) +#define CS_NAND_ECC_ENECC (1<<0) + +static void cs553x_read_buf(struct mtd_info *mtd, u_char *buf, int len) +{ + struct nand_chip *this = mtd_to_nand(mtd); + + while (unlikely(len > 0x800)) { + memcpy_fromio(buf, this->IO_ADDR_R, 0x800); + buf += 0x800; + len -= 0x800; + } + memcpy_fromio(buf, this->IO_ADDR_R, len); +} + +static void cs553x_write_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + struct nand_chip *this = mtd_to_nand(mtd); + + while (unlikely(len > 0x800)) { + memcpy_toio(this->IO_ADDR_R, buf, 0x800); + buf += 0x800; + len -= 0x800; + } + memcpy_toio(this->IO_ADDR_R, buf, len); +} + +static unsigned char cs553x_read_byte(struct mtd_info *mtd) +{ + struct nand_chip *this = mtd_to_nand(mtd); + return readb(this->IO_ADDR_R); +} + +static void cs553x_write_byte(struct mtd_info *mtd, u_char byte) +{ + struct nand_chip *this = mtd_to_nand(mtd); + int i = 100000; + + while (i && readb(this->IO_ADDR_R + MM_NAND_STS) & CS_NAND_CTLR_BUSY) { + udelay(1); + i--; + } + writeb(byte, this->IO_ADDR_W + 0x801); +} + +static void cs553x_hwcontrol(struct mtd_info *mtd, int cmd, + unsigned int ctrl) +{ + struct nand_chip *this = mtd_to_nand(mtd); + void __iomem *mmio_base = this->IO_ADDR_R; + if (ctrl & NAND_CTRL_CHANGE) { + unsigned char ctl = (ctrl & ~NAND_CTRL_CHANGE ) ^ 0x01; + writeb(ctl, mmio_base + MM_NAND_CTL); + } + if (cmd != NAND_CMD_NONE) + cs553x_write_byte(mtd, cmd); +} + +static int cs553x_device_ready(struct mtd_info *mtd) +{ + struct nand_chip *this = mtd_to_nand(mtd); + void __iomem *mmio_base = this->IO_ADDR_R; + unsigned char foo = readb(mmio_base + MM_NAND_STS); + + return (foo & CS_NAND_STS_FLASH_RDY) && !(foo & CS_NAND_CTLR_BUSY); +} + +static void cs_enable_hwecc(struct mtd_info *mtd, int mode) +{ + struct nand_chip *this = mtd_to_nand(mtd); + void __iomem *mmio_base = this->IO_ADDR_R; + + writeb(0x07, mmio_base + MM_NAND_ECC_CTL); +} + +static int cs_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code) +{ + uint32_t ecc; + struct nand_chip *this = mtd_to_nand(mtd); + void __iomem *mmio_base = this->IO_ADDR_R; + + ecc = readl(mmio_base + MM_NAND_STS); + + ecc_code[1] = ecc >> 8; + ecc_code[0] = ecc >> 16; + ecc_code[2] = ecc >> 24; + return 0; +} + +static struct mtd_info *cs553x_mtd[4]; + +static int __init cs553x_init_one(int cs, int mmio, unsigned long adr) +{ + int err = 0; + struct nand_chip *this; + struct mtd_info *new_mtd; + + pr_notice("Probing CS553x NAND controller CS#%d at %sIO 0x%08lx\n", + cs, mmio ? "MM" : "P", adr); + + if (!mmio) { + pr_notice("PIO mode not yet implemented for CS553X NAND controller\n"); + return -ENXIO; + } + + /* Allocate memory for MTD device structure and private data */ + this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL); + if (!this) { + err = -ENOMEM; + goto out; + } + + new_mtd = nand_to_mtd(this); + + /* Link the private data with the MTD structure */ + new_mtd->owner = THIS_MODULE; + + /* map physical address */ + this->IO_ADDR_R = this->IO_ADDR_W = ioremap(adr, 4096); + if (!this->IO_ADDR_R) { + pr_warn("ioremap cs553x NAND @0x%08lx failed\n", adr); + err = -EIO; + goto out_mtd; + } + + this->cmd_ctrl = cs553x_hwcontrol; + this->dev_ready = cs553x_device_ready; + this->read_byte = cs553x_read_byte; + this->read_buf = cs553x_read_buf; + this->write_buf = cs553x_write_buf; + + this->chip_delay = 0; + + this->ecc.mode = NAND_ECC_HW; + this->ecc.size = 256; + this->ecc.bytes = 3; + this->ecc.hwctl = cs_enable_hwecc; + this->ecc.calculate = cs_calculate_ecc; + this->ecc.correct = nand_correct_data; + this->ecc.strength = 1; + + /* Enable the following for a flash based bad block table */ + this->bbt_options = NAND_BBT_USE_FLASH; + + new_mtd->name = kasprintf(GFP_KERNEL, "cs553x_nand_cs%d", cs); + if (!new_mtd->name) { + err = -ENOMEM; + goto out_ior; + } + + /* Scan to find existence of the device */ + err = nand_scan(this, 1); + if (err) + goto out_free; + + cs553x_mtd[cs] = new_mtd; + goto out; + +out_free: + kfree(new_mtd->name); +out_ior: + iounmap(this->IO_ADDR_R); +out_mtd: + kfree(this); +out: + return err; +} + +static int is_geode(void) +{ + /* These are the CPUs which will have a CS553[56] companion chip */ + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && + boot_cpu_data.x86 == 5 && + boot_cpu_data.x86_model == 10) + return 1; /* Geode LX */ + + if ((boot_cpu_data.x86_vendor == X86_VENDOR_NSC || + boot_cpu_data.x86_vendor == X86_VENDOR_CYRIX) && + boot_cpu_data.x86 == 5 && + boot_cpu_data.x86_model == 5) + return 1; /* Geode GX (née GX2) */ + + return 0; +} + +static int __init cs553x_init(void) +{ + int err = -ENXIO; + int i; + uint64_t val; + + /* If the CPU isn't a Geode GX or LX, abort */ + if (!is_geode()) + return -ENXIO; + + /* If it doesn't have the CS553[56], abort */ + rdmsrl(MSR_DIVIL_GLD_CAP, val); + val &= ~0xFFULL; + if (val != CAP_CS5535 && val != CAP_CS5536) + return -ENXIO; + + /* If it doesn't have the NAND controller enabled, abort */ + rdmsrl(MSR_DIVIL_BALL_OPTS, val); + if (val & PIN_OPT_IDE) { + pr_info("CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n"); + return -ENXIO; + } + + for (i = 0; i < NR_CS553X_CONTROLLERS; i++) { + rdmsrl(MSR_DIVIL_LBAR_FLSH0 + i, val); + + if ((val & (FLSH_LBAR_EN|FLSH_NOR_NAND)) == (FLSH_LBAR_EN|FLSH_NOR_NAND)) + err = cs553x_init_one(i, !!(val & FLSH_MEM_IO), val & 0xFFFFFFFF); + } + + /* Register all devices together here. This means we can easily hack it to + do mtdconcat etc. if we want to. */ + for (i = 0; i < NR_CS553X_CONTROLLERS; i++) { + if (cs553x_mtd[i]) { + /* If any devices registered, return success. Else the last error. */ + mtd_device_register(cs553x_mtd[i], NULL, 0); + err = 0; + } + } + + return err; +} + +module_init(cs553x_init); + +static void __exit cs553x_cleanup(void) +{ + int i; + + for (i = 0; i < NR_CS553X_CONTROLLERS; i++) { + struct mtd_info *mtd = cs553x_mtd[i]; + struct nand_chip *this; + void __iomem *mmio_base; + + if (!mtd) + continue; + + this = mtd_to_nand(mtd); + mmio_base = this->IO_ADDR_R; + + /* Release resources, unregister device */ + nand_release(this); + kfree(mtd->name); + cs553x_mtd[i] = NULL; + + /* unmap physical address */ + iounmap(mmio_base); + + /* Free the MTD device structure */ + kfree(this); + } +} + +module_exit(cs553x_cleanup); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); +MODULE_DESCRIPTION("NAND controller driver for AMD CS5535/CS5536 companion chip"); |