1/* 2 * $Id: walnut.c,v 1.1.1.1 2007/08/03 18:52:44 Exp $ 3 * 4 * Mapping for Walnut flash 5 * (used ebony.c as a "framework") 6 * 7 * Heikki Lindholm <holindho@infradead.org> 8 * 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the 12 * Free Software Foundation; either version 2 of the License, or (at your 13 * option) any later version. 14 */ 15 16#include <linux/module.h> 17#include <linux/types.h> 18#include <linux/kernel.h> 19#include <linux/init.h> 20#include <linux/mtd/mtd.h> 21#include <linux/mtd/map.h> 22#include <linux/mtd/partitions.h> 23#include <asm/io.h> 24#include <asm/ibm4xx.h> 25#include <platforms/4xx/walnut.h> 26 27/* these should be in platforms/4xx/walnut.h ? */ 28#define WALNUT_FLASH_ONBD_N(x) (x & 0x02) 29#define WALNUT_FLASH_SRAM_SEL(x) (x & 0x01) 30#define WALNUT_FLASH_LOW 0xFFF00000 31#define WALNUT_FLASH_HIGH 0xFFF80000 32#define WALNUT_FLASH_SIZE 0x80000 33 34static struct mtd_info *flash; 35 36static struct map_info walnut_map = { 37 .name = "Walnut flash", 38 .size = WALNUT_FLASH_SIZE, 39 .bankwidth = 1, 40}; 41 42/* Actually, OpenBIOS is the last 128 KiB of the flash - better 43 * partitioning could be made */ 44static struct mtd_partition walnut_partitions[] = { 45 { 46 .name = "OpenBIOS", 47 .offset = 0x0, 48 .size = WALNUT_FLASH_SIZE, 49 /*.mask_flags = MTD_WRITEABLE, */ /* force read-only */ 50 } 51}; 52 53int __init init_walnut(void) 54{ 55 u8 fpga_brds1; 56 void *fpga_brds1_adr; 57 void *fpga_status_adr; 58 unsigned long flash_base; 59 60 /* this should already be mapped (platform/4xx/walnut.c) */ 61 fpga_status_adr = ioremap(WALNUT_FPGA_BASE, 8); 62 if (!fpga_status_adr) 63 return -ENOMEM; 64 65 fpga_brds1_adr = fpga_status_adr+5; 66 fpga_brds1 = readb(fpga_brds1_adr); 67 /* iounmap(fpga_status_adr); */ 68 69 if (WALNUT_FLASH_ONBD_N(fpga_brds1)) { 70 printk("The on-board flash is disabled (U79 sw 5)!"); 71 iounmap(fpga_status_adr); 72 return -EIO; 73 } 74 if (WALNUT_FLASH_SRAM_SEL(fpga_brds1)) 75 flash_base = WALNUT_FLASH_LOW; 76 else 77 flash_base = WALNUT_FLASH_HIGH; 78 79 walnut_map.phys = flash_base; 80 walnut_map.virt = 81 (void __iomem *)ioremap(flash_base, walnut_map.size); 82 83 if (!walnut_map.virt) { 84 printk("Failed to ioremap flash.\n"); 85 iounmap(fpga_status_adr); 86 return -EIO; 87 } 88 89 simple_map_init(&walnut_map); 90 91 flash = do_map_probe("jedec_probe", &walnut_map); 92 if (flash) { 93 flash->owner = THIS_MODULE; 94 add_mtd_partitions(flash, walnut_partitions, 95 ARRAY_SIZE(walnut_partitions)); 96 } else { 97 printk("map probe failed for flash\n"); 98 iounmap(fpga_status_adr); 99 return -ENXIO; 100 } 101 102 iounmap(fpga_status_adr); 103 return 0; 104} 105 106static void __exit cleanup_walnut(void) 107{ 108 if (flash) { 109 del_mtd_partitions(flash); 110 map_destroy(flash); 111 } 112 113 if (walnut_map.virt) { 114 iounmap((void *)walnut_map.virt); 115 walnut_map.virt = 0; 116 } 117} 118 119module_init(init_walnut); 120module_exit(cleanup_walnut); 121 122MODULE_LICENSE("GPL"); 123MODULE_AUTHOR("Heikki Lindholm <holindho@infradead.org>"); 124MODULE_DESCRIPTION("MTD map and partitions for IBM 405GP Walnut boards"); 125