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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
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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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