integrator-flash.c
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上传日期:2013-02-24
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- /*======================================================================
- drivers/mtd/maps/armflash.c: ARM Flash Layout/Partitioning
-
- Copyright (C) 2000 ARM Limited
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-
- This is access code for flashes using ARM's flash partitioning
- standards.
- $Id: integrator-flash.c,v 1.7 2001/11/01 20:55:47 rmk Exp $
- ======================================================================*/
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/ioport.h>
- #include <linux/init.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/map.h>
- #include <linux/mtd/partitions.h>
- #include <asm/hardware.h>
- #include <asm/io.h>
- #include <asm/system.h>
- extern int parse_afs_partitions(struct mtd_info *, struct mtd_partition **);
- // board specific stuff - sorry, it should be in arch/arm/mach-*.
- #ifdef CONFIG_ARCH_INTEGRATOR
- #define FLASH_BASE INTEGRATOR_FLASH_BASE
- #define FLASH_SIZE INTEGRATOR_FLASH_SIZE
- #define FLASH_PART_SIZE 0x400000
- #define SC_CTRLC (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLC_OFFSET)
- #define SC_CTRLS (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLS_OFFSET)
- #define EBI_CSR1 (IO_ADDRESS(INTEGRATOR_EBI_BASE) + INTEGRATOR_EBI_CSR1_OFFSET)
- #define EBI_LOCK (IO_ADDRESS(INTEGRATOR_EBI_BASE) + INTEGRATOR_EBI_LOCK_OFFSET)
- /*
- * Initialise the flash access systems:
- * - Disable VPP
- * - Assert WP
- * - Set write enable bit in EBI reg
- */
- static void armflash_flash_init(void)
- {
- unsigned int tmp;
- __raw_writel(INTEGRATOR_SC_CTRL_nFLVPPEN | INTEGRATOR_SC_CTRL_nFLWP, SC_CTRLC);
- tmp = __raw_readl(EBI_CSR1) | INTEGRATOR_EBI_WRITE_ENABLE;
- __raw_writel(tmp, EBI_CSR1);
- if (!(__raw_readl(EBI_CSR1) & INTEGRATOR_EBI_WRITE_ENABLE)) {
- __raw_writel(0xa05f, EBI_LOCK);
- __raw_writel(tmp, EBI_CSR1);
- __raw_writel(0, EBI_LOCK);
- }
- }
- /*
- * Shutdown the flash access systems:
- * - Disable VPP
- * - Assert WP
- * - Clear write enable bit in EBI reg
- */
- static void armflash_flash_exit(void)
- {
- unsigned int tmp;
- __raw_writel(INTEGRATOR_SC_CTRL_nFLVPPEN | INTEGRATOR_SC_CTRL_nFLWP, SC_CTRLC);
- /*
- * Clear the write enable bit in system controller EBI register.
- */
- tmp = __raw_readl(EBI_CSR1) & ~INTEGRATOR_EBI_WRITE_ENABLE;
- __raw_writel(tmp, EBI_CSR1);
- if (__raw_readl(EBI_CSR1) & INTEGRATOR_EBI_WRITE_ENABLE) {
- __raw_writel(0xa05f, EBI_LOCK);
- __raw_writel(tmp, EBI_CSR1);
- __raw_writel(0, EBI_LOCK);
- }
- }
- static void armflash_flash_wp(int on)
- {
- unsigned int reg;
- if (on)
- reg = SC_CTRLC;
- else
- reg = SC_CTRLS;
- __raw_writel(INTEGRATOR_SC_CTRL_nFLWP, reg);
- }
- static void armflash_set_vpp(struct map_info *map, int on)
- {
- unsigned int reg;
- if (on)
- reg = SC_CTRLS;
- else
- reg = SC_CTRLC;
- __raw_writel(INTEGRATOR_SC_CTRL_nFLVPPEN, reg);
- }
- #endif
- #ifdef CONFIG_ARCH_P720T
- #define FLASH_BASE (0x04000000)
- #define FLASH_SIZE (64*1024*1024)
- #define FLASH_PART_SIZE (4*1024*1024)
- #define FLASH_BLOCK_SIZE (128*1024)
- static void armflash_flash_init(void)
- {
- }
- static void armflash_flash_exit(void)
- {
- }
- static void armflash_flash_wp(int on)
- {
- }
- static void armflash_set_vpp(struct map_info *map, int on)
- {
- }
- #endif
- static __u8 armflash_read8(struct map_info *map, unsigned long ofs)
- {
- return readb(ofs + map->map_priv_2);
- }
- static __u16 armflash_read16(struct map_info *map, unsigned long ofs)
- {
- return readw(ofs + map->map_priv_2);
- }
- static __u32 armflash_read32(struct map_info *map, unsigned long ofs)
- {
- return readl(ofs + map->map_priv_2);
- }
- static void armflash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
- {
- memcpy(to, (void *) (from + map->map_priv_2), len);
- }
- static void armflash_write8(struct map_info *map, __u8 d, unsigned long adr)
- {
- writeb(d, adr + map->map_priv_2);
- }
- static void armflash_write16(struct map_info *map, __u16 d, unsigned long adr)
- {
- writew(d, adr + map->map_priv_2);
- }
- static void armflash_write32(struct map_info *map, __u32 d, unsigned long adr)
- {
- writel(d, adr + map->map_priv_2);
- }
- static void armflash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
- {
- memcpy((void *) (to + map->map_priv_2), from, len);
- }
- static struct map_info armflash_map =
- {
- name: "AFS",
- read8: armflash_read8,
- read16: armflash_read16,
- read32: armflash_read32,
- copy_from: armflash_copy_from,
- write8: armflash_write8,
- write16: armflash_write16,
- write32: armflash_write32,
- copy_to: armflash_copy_to,
- set_vpp: armflash_set_vpp,
- };
- static struct mtd_info *mtd;
- static struct mtd_partition *parts;
- static int __init armflash_cfi_init(void *base, u_int size)
- {
- int ret;
- armflash_flash_init();
- armflash_flash_wp(1);
- /*
- * look for CFI based flash parts fitted to this board
- */
- armflash_map.size = size;
- armflash_map.buswidth = 4;
- armflash_map.map_priv_2 = (unsigned long) base;
- /*
- * Also, the CFI layer automatically works out what size
- * of chips we have, and does the necessary identification
- * for us automatically.
- */
- mtd = do_map_probe("cfi_probe", &armflash_map);
- if (!mtd)
- return -ENXIO;
- mtd->module = THIS_MODULE;
- ret = parse_afs_partitions(mtd, &parts);
- if (ret > 0) {
- ret = add_mtd_partitions(mtd, parts, ret);
- if (ret)
- printk(KERN_ERR "mtd partition registration "
- "failed: %dn", ret);
- }
- /*
- * If we got an error, free all resources.
- */
- if (ret < 0) {
- del_mtd_partitions(mtd);
- map_destroy(mtd);
- }
- return ret;
- }
- static void armflash_cfi_exit(void)
- {
- if (mtd) {
- del_mtd_partitions(mtd);
- map_destroy(mtd);
- }
- if (parts)
- kfree(parts);
- }
- static int __init armflash_init(void)
- {
- int err = -EBUSY;
- void *base;
- if (request_mem_region(FLASH_BASE, FLASH_SIZE, "flash") == NULL)
- goto out;
- base = ioremap(FLASH_BASE, FLASH_SIZE);
- err = -ENOMEM;
- if (base == NULL)
- goto release;
- err = armflash_cfi_init(base, FLASH_SIZE);
- if (err) {
- iounmap(base);
- release:
- release_mem_region(FLASH_BASE, FLASH_SIZE);
- }
- out:
- return err;
- }
- static void __exit armflash_exit(void)
- {
- armflash_cfi_exit();
- iounmap((void *)armflash_map.map_priv_2);
- release_mem_region(FLASH_BASE, FLASH_SIZE);
- armflash_flash_exit();
- }
- module_init(armflash_init);
- module_exit(armflash_exit);
- MODULE_AUTHOR("ARM Ltd");
- MODULE_DESCRIPTION("ARM Integrator CFI map driver");
- MODULE_LICENSE("GPL");