diff options
Diffstat (limited to 'arch/ppc64/kernel/pmac_nvram.c')
| -rw-r--r-- | arch/ppc64/kernel/pmac_nvram.c | 493 |
1 files changed, 0 insertions, 493 deletions
diff --git a/arch/ppc64/kernel/pmac_nvram.c b/arch/ppc64/kernel/pmac_nvram.c deleted file mode 100644 index 5fe9785ad7d8..000000000000 --- a/arch/ppc64/kernel/pmac_nvram.c +++ /dev/null @@ -1,493 +0,0 @@ -/* - * arch/ppc/platforms/pmac_nvram.c - * - * Copyright (C) 2002 Benjamin Herrenschmidt (benh@kernel.crashing.org) - * - * 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. - * - * Todo: - add support for the OF persistent properties - */ -#include <linux/config.h> -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/stddef.h> -#include <linux/string.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/bootmem.h> -#include <linux/completion.h> -#include <linux/spinlock.h> -#include <asm/sections.h> -#include <asm/io.h> -#include <asm/system.h> -#include <asm/prom.h> -#include <asm/machdep.h> -#include <asm/nvram.h> - -#define DEBUG - -#ifdef DEBUG -#define DBG(x...) printk(x) -#else -#define DBG(x...) -#endif - -#define NVRAM_SIZE 0x2000 /* 8kB of non-volatile RAM */ - -#define CORE99_SIGNATURE 0x5a -#define CORE99_ADLER_START 0x14 - -/* On Core99, nvram is either a sharp, a micron or an AMD flash */ -#define SM_FLASH_STATUS_DONE 0x80 -#define SM_FLASH_STATUS_ERR 0x38 - -#define SM_FLASH_CMD_ERASE_CONFIRM 0xd0 -#define SM_FLASH_CMD_ERASE_SETUP 0x20 -#define SM_FLASH_CMD_RESET 0xff -#define SM_FLASH_CMD_WRITE_SETUP 0x40 -#define SM_FLASH_CMD_CLEAR_STATUS 0x50 -#define SM_FLASH_CMD_READ_STATUS 0x70 - -/* CHRP NVRAM header */ -struct chrp_header { - u8 signature; - u8 cksum; - u16 len; - char name[12]; - u8 data[0]; -}; - -struct core99_header { - struct chrp_header hdr; - u32 adler; - u32 generation; - u32 reserved[2]; -}; - -/* - * Read and write the non-volatile RAM on PowerMacs and CHRP machines. - */ -static volatile unsigned char *nvram_data; -static int core99_bank = 0; -// XXX Turn that into a sem -static DEFINE_SPINLOCK(nv_lock); - -extern int system_running; - -static int (*core99_write_bank)(int bank, u8* datas); -static int (*core99_erase_bank)(int bank); - -static char *nvram_image; - - -static ssize_t core99_nvram_read(char *buf, size_t count, loff_t *index) -{ - int i; - - if (nvram_image == NULL) - return -ENODEV; - if (*index > NVRAM_SIZE) - return 0; - - i = *index; - if (i + count > NVRAM_SIZE) - count = NVRAM_SIZE - i; - - memcpy(buf, &nvram_image[i], count); - *index = i + count; - return count; -} - -static ssize_t core99_nvram_write(char *buf, size_t count, loff_t *index) -{ - int i; - - if (nvram_image == NULL) - return -ENODEV; - if (*index > NVRAM_SIZE) - return 0; - - i = *index; - if (i + count > NVRAM_SIZE) - count = NVRAM_SIZE - i; - - memcpy(&nvram_image[i], buf, count); - *index = i + count; - return count; -} - -static ssize_t core99_nvram_size(void) -{ - if (nvram_image == NULL) - return -ENODEV; - return NVRAM_SIZE; -} - -static u8 chrp_checksum(struct chrp_header* hdr) -{ - u8 *ptr; - u16 sum = hdr->signature; - for (ptr = (u8 *)&hdr->len; ptr < hdr->data; ptr++) - sum += *ptr; - while (sum > 0xFF) - sum = (sum & 0xFF) + (sum>>8); - return sum; -} - -static u32 core99_calc_adler(u8 *buffer) -{ - int cnt; - u32 low, high; - - buffer += CORE99_ADLER_START; - low = 1; - high = 0; - for (cnt=0; cnt<(NVRAM_SIZE-CORE99_ADLER_START); cnt++) { - if ((cnt % 5000) == 0) { - high %= 65521UL; - high %= 65521UL; - } - low += buffer[cnt]; - high += low; - } - low %= 65521UL; - high %= 65521UL; - - return (high << 16) | low; -} - -static u32 core99_check(u8* datas) -{ - struct core99_header* hdr99 = (struct core99_header*)datas; - - if (hdr99->hdr.signature != CORE99_SIGNATURE) { - DBG("Invalid signature\n"); - return 0; - } - if (hdr99->hdr.cksum != chrp_checksum(&hdr99->hdr)) { - DBG("Invalid checksum\n"); - return 0; - } - if (hdr99->adler != core99_calc_adler(datas)) { - DBG("Invalid adler\n"); - return 0; - } - return hdr99->generation; -} - -static int sm_erase_bank(int bank) -{ - int stat, i; - unsigned long timeout; - - u8* base = (u8 *)nvram_data + core99_bank*NVRAM_SIZE; - - DBG("nvram: Sharp/Micron Erasing bank %d...\n", bank); - - out_8(base, SM_FLASH_CMD_ERASE_SETUP); - out_8(base, SM_FLASH_CMD_ERASE_CONFIRM); - timeout = 0; - do { - if (++timeout > 1000000) { - printk(KERN_ERR "nvram: Sharp/Miron flash erase timeout !\n"); - break; - } - out_8(base, SM_FLASH_CMD_READ_STATUS); - stat = in_8(base); - } while (!(stat & SM_FLASH_STATUS_DONE)); - - out_8(base, SM_FLASH_CMD_CLEAR_STATUS); - out_8(base, SM_FLASH_CMD_RESET); - - for (i=0; i<NVRAM_SIZE; i++) - if (base[i] != 0xff) { - printk(KERN_ERR "nvram: Sharp/Micron flash erase failed !\n"); - return -ENXIO; - } - return 0; -} - -static int sm_write_bank(int bank, u8* datas) -{ - int i, stat = 0; - unsigned long timeout; - - u8* base = (u8 *)nvram_data + core99_bank*NVRAM_SIZE; - - DBG("nvram: Sharp/Micron Writing bank %d...\n", bank); - - for (i=0; i<NVRAM_SIZE; i++) { - out_8(base+i, SM_FLASH_CMD_WRITE_SETUP); - udelay(1); - out_8(base+i, datas[i]); - timeout = 0; - do { - if (++timeout > 1000000) { - printk(KERN_ERR "nvram: Sharp/Micron flash write timeout !\n"); - break; - } - out_8(base, SM_FLASH_CMD_READ_STATUS); - stat = in_8(base); - } while (!(stat & SM_FLASH_STATUS_DONE)); - if (!(stat & SM_FLASH_STATUS_DONE)) - break; - } - out_8(base, SM_FLASH_CMD_CLEAR_STATUS); - out_8(base, SM_FLASH_CMD_RESET); - for (i=0; i<NVRAM_SIZE; i++) - if (base[i] != datas[i]) { - printk(KERN_ERR "nvram: Sharp/Micron flash write failed !\n"); - return -ENXIO; - } - return 0; -} - -static int amd_erase_bank(int bank) -{ - int i, stat = 0; - unsigned long timeout; - - u8* base = (u8 *)nvram_data + core99_bank*NVRAM_SIZE; - - DBG("nvram: AMD Erasing bank %d...\n", bank); - - /* Unlock 1 */ - out_8(base+0x555, 0xaa); - udelay(1); - /* Unlock 2 */ - out_8(base+0x2aa, 0x55); - udelay(1); - - /* Sector-Erase */ - out_8(base+0x555, 0x80); - udelay(1); - out_8(base+0x555, 0xaa); - udelay(1); - out_8(base+0x2aa, 0x55); - udelay(1); - out_8(base, 0x30); - udelay(1); - - timeout = 0; - do { - if (++timeout > 1000000) { - printk(KERN_ERR "nvram: AMD flash erase timeout !\n"); - break; - } - stat = in_8(base) ^ in_8(base); - } while (stat != 0); - - /* Reset */ - out_8(base, 0xf0); - udelay(1); - - for (i=0; i<NVRAM_SIZE; i++) - if (base[i] != 0xff) { - printk(KERN_ERR "nvram: AMD flash erase failed !\n"); - return -ENXIO; - } - return 0; -} - -static int amd_write_bank(int bank, u8* datas) -{ - int i, stat = 0; - unsigned long timeout; - - u8* base = (u8 *)nvram_data + core99_bank*NVRAM_SIZE; - - DBG("nvram: AMD Writing bank %d...\n", bank); - - for (i=0; i<NVRAM_SIZE; i++) { - /* Unlock 1 */ - out_8(base+0x555, 0xaa); - udelay(1); - /* Unlock 2 */ - out_8(base+0x2aa, 0x55); - udelay(1); - - /* Write single word */ - out_8(base+0x555, 0xa0); - udelay(1); - out_8(base+i, datas[i]); - - timeout = 0; - do { - if (++timeout > 1000000) { - printk(KERN_ERR "nvram: AMD flash write timeout !\n"); - break; - } - stat = in_8(base) ^ in_8(base); - } while (stat != 0); - if (stat != 0) - break; - } - - /* Reset */ - out_8(base, 0xf0); - udelay(1); - - for (i=0; i<NVRAM_SIZE; i++) - if (base[i] != datas[i]) { - printk(KERN_ERR "nvram: AMD flash write failed !\n"); - return -ENXIO; - } - return 0; -} - - -static void core99_nvram_sync(void) -{ - struct core99_header* hdr99; - unsigned long flags; - - spin_lock_irqsave(&nv_lock, flags); - if (!memcmp(nvram_image, (u8*)nvram_data + core99_bank*NVRAM_SIZE, - NVRAM_SIZE)) - goto bail; - - DBG("Updating nvram...\n"); - - hdr99 = (struct core99_header*)nvram_image; - hdr99->generation++; - hdr99->hdr.signature = CORE99_SIGNATURE; - hdr99->hdr.cksum = chrp_checksum(&hdr99->hdr); - hdr99->adler = core99_calc_adler(nvram_image); - core99_bank = core99_bank ? 0 : 1; - if (core99_erase_bank) - if (core99_erase_bank(core99_bank)) { - printk("nvram: Error erasing bank %d\n", core99_bank); - goto bail; - } - if (core99_write_bank) - if (core99_write_bank(core99_bank, nvram_image)) - printk("nvram: Error writing bank %d\n", core99_bank); - bail: - spin_unlock_irqrestore(&nv_lock, flags); -} - -int __init pmac_nvram_init(void) -{ - struct device_node *dp; - u32 gen_bank0, gen_bank1; - int i; - - dp = find_devices("nvram"); - if (dp == NULL) { - printk(KERN_ERR "Can't find NVRAM device\n"); - return -ENODEV; - } - if (!device_is_compatible(dp, "nvram,flash")) { - printk(KERN_ERR "Incompatible type of NVRAM\n"); - return -ENXIO; - } - - nvram_image = alloc_bootmem(NVRAM_SIZE); - if (nvram_image == NULL) { - printk(KERN_ERR "nvram: can't allocate ram image\n"); - return -ENOMEM; - } - nvram_data = ioremap(dp->addrs[0].address, NVRAM_SIZE*2); - - DBG("nvram: Checking bank 0...\n"); - - gen_bank0 = core99_check((u8 *)nvram_data); - gen_bank1 = core99_check((u8 *)nvram_data + NVRAM_SIZE); - core99_bank = (gen_bank0 < gen_bank1) ? 1 : 0; - - DBG("nvram: gen0=%d, gen1=%d\n", gen_bank0, gen_bank1); - DBG("nvram: Active bank is: %d\n", core99_bank); - - for (i=0; i<NVRAM_SIZE; i++) - nvram_image[i] = nvram_data[i + core99_bank*NVRAM_SIZE]; - - ppc_md.nvram_read = core99_nvram_read; - ppc_md.nvram_write = core99_nvram_write; - ppc_md.nvram_size = core99_nvram_size; - ppc_md.nvram_sync = core99_nvram_sync; - - /* - * Maybe we could be smarter here though making an exclusive list - * of known flash chips is a bit nasty as older OF didn't provide us - * with a useful "compatible" entry. A solution would be to really - * identify the chip using flash id commands and base ourselves on - * a list of known chips IDs - */ - if (device_is_compatible(dp, "amd-0137")) { - core99_erase_bank = amd_erase_bank; - core99_write_bank = amd_write_bank; - } else { - core99_erase_bank = sm_erase_bank; - core99_write_bank = sm_write_bank; - } - - return 0; -} - -int pmac_get_partition(int partition) -{ - struct nvram_partition *part; - const char *name; - int sig; - - switch(partition) { - case pmac_nvram_OF: - name = "common"; - sig = NVRAM_SIG_SYS; - break; - case pmac_nvram_XPRAM: - name = "APL,MacOS75"; - sig = NVRAM_SIG_OS; - break; - case pmac_nvram_NR: - default: - /* Oldworld stuff */ - return -ENODEV; - } - - part = nvram_find_partition(sig, name); - if (part == NULL) - return 0; - - return part->index; -} - -u8 pmac_xpram_read(int xpaddr) -{ - int offset = pmac_get_partition(pmac_nvram_XPRAM); - loff_t index; - u8 buf; - ssize_t count; - - if (offset < 0 || xpaddr < 0 || xpaddr > 0x100) - return 0xff; - index = offset + xpaddr; - - count = ppc_md.nvram_read(&buf, 1, &index); - if (count != 1) - return 0xff; - return buf; -} - -void pmac_xpram_write(int xpaddr, u8 data) -{ - int offset = pmac_get_partition(pmac_nvram_XPRAM); - loff_t index; - u8 buf; - - if (offset < 0 || xpaddr < 0 || xpaddr > 0x100) - return; - index = offset + xpaddr; - buf = data; - - ppc_md.nvram_write(&buf, 1, &index); -} - -EXPORT_SYMBOL(pmac_get_partition); -EXPORT_SYMBOL(pmac_xpram_read); -EXPORT_SYMBOL(pmac_xpram_write); |