// SPDX-License-Identifier: GPL-2.0-or-later /* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX, SBC-GXm and SBC-GX1 series boards. Copyright (C) 2001 Arcom Control System Ltd The SBC-MediaGX / SBC-GXx has up to 16 MiB of Intel StrataFlash (28F320/28F640) in x8 mode. This driver uses the CFI probe and Intel Extended Command Set drivers. The flash is accessed as follows: 16 KiB memory window at 0xdc000-0xdffff Two IO address locations for paging 0x258 bit 0-7: address bit 14-21 0x259 bit 0-1: address bit 22-23 bit 7: 0 - reset/powered down 1 - device enabled The single flash device is divided into 3 partition which appear as separate MTD devices. 25/04/2001 AJL (Arcom) Modified signon strings and partition sizes (to support bzImages up to 638KiB-ish) */ // Includes #include <linux/module.h> #include <linux/ioport.h> #include <linux/init.h> #include <asm/io.h> #include <linux/mtd/mtd.h> #include <linux/mtd/map.h> #include <linux/mtd/partitions.h> // Defines // - Hardware specific #define WINDOW_START … /* Number of bits in offset. */ #define WINDOW_SHIFT … #define WINDOW_LENGTH … /* The bits for the offset into the window. */ #define WINDOW_MASK … #define PAGE_IO … #define PAGE_IO_SIZE … /* bit 7 of 0x259 must be 1 to enable device. */ #define DEVICE_ENABLE … // - Flash / Partition sizing #define MAX_SIZE_KiB … #define BOOT_PARTITION_SIZE_KiB … #define DATA_PARTITION_SIZE_KiB … #define APP_PARTITION_SIZE_KiB … // Globals static volatile int page_in_window = …; // Current page in window. static void __iomem *iomapadr; static DEFINE_SPINLOCK(sbc_gxx_spin); /* partition_info gives details on the logical partitions that the split the * single flash device into. If the size if zero we use up to the end of the * device. */ static const struct mtd_partition partition_info[] = …; #define NUM_PARTITIONS … static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs) { … } static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs) { … } static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) { … } static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr) { … } static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) { … } static struct map_info sbc_gxx_map = …; /* MTD device for all of the flash. */ static struct mtd_info *all_mtd; static void cleanup_sbc_gxx(void) { … } static int __init init_sbc_gxx(void) { … } module_init(…) …; module_exit(cleanup_sbc_gxx); MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
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