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143 lines
3.6 KiB
143 lines
3.6 KiB
/* |
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* Octeon Bootbus flash setup |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 2007, 2008 Cavium Networks |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/semaphore.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/of_platform.h> |
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#include <linux/mtd/partitions.h> |
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#include <asm/octeon/octeon.h> |
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static struct map_info flash_map; |
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static struct mtd_info *mymtd; |
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static const char *part_probe_types[] = { |
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"cmdlinepart", |
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#ifdef CONFIG_MTD_REDBOOT_PARTS |
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"RedBoot", |
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#endif |
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NULL |
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}; |
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static map_word octeon_flash_map_read(struct map_info *map, unsigned long ofs) |
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{ |
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map_word r; |
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down(&octeon_bootbus_sem); |
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r = inline_map_read(map, ofs); |
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up(&octeon_bootbus_sem); |
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return r; |
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} |
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static void octeon_flash_map_write(struct map_info *map, const map_word datum, |
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unsigned long ofs) |
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{ |
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down(&octeon_bootbus_sem); |
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inline_map_write(map, datum, ofs); |
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up(&octeon_bootbus_sem); |
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} |
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static void octeon_flash_map_copy_from(struct map_info *map, void *to, |
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unsigned long from, ssize_t len) |
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{ |
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down(&octeon_bootbus_sem); |
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inline_map_copy_from(map, to, from, len); |
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up(&octeon_bootbus_sem); |
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} |
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static void octeon_flash_map_copy_to(struct map_info *map, unsigned long to, |
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const void *from, ssize_t len) |
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{ |
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down(&octeon_bootbus_sem); |
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inline_map_copy_to(map, to, from, len); |
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up(&octeon_bootbus_sem); |
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} |
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/* |
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* Module/ driver initialization. |
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* |
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* Returns Zero on success |
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*/ |
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static int octeon_flash_probe(struct platform_device *pdev) |
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{ |
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union cvmx_mio_boot_reg_cfgx region_cfg; |
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u32 cs; |
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int r; |
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struct device_node *np = pdev->dev.of_node; |
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r = of_property_read_u32(np, "reg", &cs); |
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if (r) |
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return r; |
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/* |
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* Read the bootbus region 0 setup to determine the base |
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* address of the flash. |
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*/ |
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region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs)); |
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if (region_cfg.s.en) { |
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/* |
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* The bootloader always takes the flash and sets its |
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* address so the entire flash fits below |
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* 0x1fc00000. This way the flash aliases to |
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* 0x1fc00000 for booting. Software can access the |
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* full flash at the true address, while core boot can |
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* access 4MB. |
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*/ |
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/* Use this name so old part lines work */ |
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flash_map.name = "phys_mapped_flash"; |
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flash_map.phys = region_cfg.s.base << 16; |
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flash_map.size = 0x1fc00000 - flash_map.phys; |
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/* 8-bit bus (0 + 1) or 16-bit bus (1 + 1) */ |
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flash_map.bankwidth = region_cfg.s.width + 1; |
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flash_map.virt = ioremap(flash_map.phys, flash_map.size); |
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pr_notice("Bootbus flash: Setting flash for %luMB flash at " |
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"0x%08llx\n", flash_map.size >> 20, flash_map.phys); |
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WARN_ON(!map_bankwidth_supported(flash_map.bankwidth)); |
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flash_map.read = octeon_flash_map_read; |
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flash_map.write = octeon_flash_map_write; |
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flash_map.copy_from = octeon_flash_map_copy_from; |
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flash_map.copy_to = octeon_flash_map_copy_to; |
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mymtd = do_map_probe("cfi_probe", &flash_map); |
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if (mymtd) { |
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mymtd->owner = THIS_MODULE; |
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mtd_device_parse_register(mymtd, part_probe_types, |
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NULL, NULL, 0); |
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} else { |
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pr_err("Failed to register MTD device for flash\n"); |
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} |
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} |
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return 0; |
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} |
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static const struct of_device_id of_flash_match[] = { |
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{ |
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.compatible = "cfi-flash", |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, of_flash_match); |
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static struct platform_driver of_flash_driver = { |
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.driver = { |
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.name = "octeon-of-flash", |
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.of_match_table = of_flash_match, |
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}, |
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.probe = octeon_flash_probe, |
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}; |
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static int octeon_flash_init(void) |
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{ |
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return platform_driver_register(&of_flash_driver); |
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} |
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late_initcall(octeon_flash_init); |
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MODULE_LICENSE("GPL");
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