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124 lines
2.9 KiB
124 lines
2.9 KiB
/*
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* $Id: walnut.c,v 1.3 2005/11/07 11:14:29 gleixner Exp $
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*
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* Mapping for Walnut flash
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* (used ebony.c as a "framework")
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*
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* Heikki Lindholm <holindho@infradead.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/ibm4xx.h>
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#include <platforms/4xx/walnut.h>
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/* these should be in platforms/4xx/walnut.h ? */
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#define WALNUT_FLASH_ONBD_N(x) (x & 0x02)
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#define WALNUT_FLASH_SRAM_SEL(x) (x & 0x01)
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#define WALNUT_FLASH_LOW 0xFFF00000
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#define WALNUT_FLASH_HIGH 0xFFF80000
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#define WALNUT_FLASH_SIZE 0x80000
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static struct mtd_info *flash;
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static struct map_info walnut_map = {
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.name = "Walnut flash",
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.size = WALNUT_FLASH_SIZE,
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.bankwidth = 1,
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};
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/* Actually, OpenBIOS is the last 128 KiB of the flash - better
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* partitioning could be made */
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static struct mtd_partition walnut_partitions[] = {
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{
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.name = "OpenBIOS",
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.offset = 0x0,
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.size = WALNUT_FLASH_SIZE,
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/*.mask_flags = MTD_WRITEABLE, */ /* force read-only */
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}
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};
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int __init init_walnut(void)
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{
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u8 fpga_brds1;
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void *fpga_brds1_adr;
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void *fpga_status_adr;
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unsigned long flash_base;
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/* this should already be mapped (platform/4xx/walnut.c) */
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fpga_status_adr = ioremap(WALNUT_FPGA_BASE, 8);
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if (!fpga_status_adr)
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return -ENOMEM;
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fpga_brds1_adr = fpga_status_adr+5;
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fpga_brds1 = readb(fpga_brds1_adr);
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/* iounmap(fpga_status_adr); */
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if (WALNUT_FLASH_ONBD_N(fpga_brds1)) {
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printk("The on-board flash is disabled (U79 sw 5)!");
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iounmap(fpga_status_adr);
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return -EIO;
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}
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if (WALNUT_FLASH_SRAM_SEL(fpga_brds1))
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flash_base = WALNUT_FLASH_LOW;
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else
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flash_base = WALNUT_FLASH_HIGH;
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walnut_map.phys = flash_base;
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walnut_map.virt =
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(void __iomem *)ioremap(flash_base, walnut_map.size);
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if (!walnut_map.virt) {
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printk("Failed to ioremap flash.\n");
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iounmap(fpga_status_adr);
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return -EIO;
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}
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simple_map_init(&walnut_map);
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flash = do_map_probe("jedec_probe", &walnut_map);
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if (flash) {
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flash->owner = THIS_MODULE;
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add_mtd_partitions(flash, walnut_partitions,
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ARRAY_SIZE(walnut_partitions));
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} else {
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printk("map probe failed for flash\n");
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iounmap(fpga_status_adr);
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return -ENXIO;
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}
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iounmap(fpga_status_adr);
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return 0;
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}
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static void __exit cleanup_walnut(void)
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{
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if (flash) {
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del_mtd_partitions(flash);
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map_destroy(flash);
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}
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if (walnut_map.virt) {
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iounmap((void *)walnut_map.virt);
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walnut_map.virt = 0;
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}
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}
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module_init(init_walnut);
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module_exit(cleanup_walnut);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Heikki Lindholm <holindho@infradead.org>");
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MODULE_DESCRIPTION("MTD map and partitions for IBM 405GP Walnut boards");
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