1 /*
2 * Octeon Bootbus flash setup
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2007, 2008 Cavium Networks
9 */
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/semaphore.h>
13 #include <linux/mtd/mtd.h>
14 #include <linux/mtd/map.h>
15 #include <linux/of_platform.h>
16 #include <linux/mtd/partitions.h>
17
18 #include <asm/octeon/octeon.h>
19
20 static struct map_info flash_map;
21 static struct mtd_info *mymtd;
22 static const char *part_probe_types[] = {
23 "cmdlinepart",
24 #ifdef CONFIG_MTD_REDBOOT_PARTS
25 "RedBoot",
26 #endif
27 NULL
28 };
29
octeon_flash_map_read(struct map_info * map,unsigned long ofs)30 static map_word octeon_flash_map_read(struct map_info *map, unsigned long ofs)
31 {
32 map_word r;
33
34 down(&octeon_bootbus_sem);
35 r = inline_map_read(map, ofs);
36 up(&octeon_bootbus_sem);
37
38 return r;
39 }
40
octeon_flash_map_write(struct map_info * map,const map_word datum,unsigned long ofs)41 static void octeon_flash_map_write(struct map_info *map, const map_word datum,
42 unsigned long ofs)
43 {
44 down(&octeon_bootbus_sem);
45 inline_map_write(map, datum, ofs);
46 up(&octeon_bootbus_sem);
47 }
48
octeon_flash_map_copy_from(struct map_info * map,void * to,unsigned long from,ssize_t len)49 static void octeon_flash_map_copy_from(struct map_info *map, void *to,
50 unsigned long from, ssize_t len)
51 {
52 down(&octeon_bootbus_sem);
53 inline_map_copy_from(map, to, from, len);
54 up(&octeon_bootbus_sem);
55 }
56
octeon_flash_map_copy_to(struct map_info * map,unsigned long to,const void * from,ssize_t len)57 static void octeon_flash_map_copy_to(struct map_info *map, unsigned long to,
58 const void *from, ssize_t len)
59 {
60 down(&octeon_bootbus_sem);
61 inline_map_copy_to(map, to, from, len);
62 up(&octeon_bootbus_sem);
63 }
64
65 /*
66 * Module/ driver initialization.
67 *
68 * Returns Zero on success
69 */
octeon_flash_probe(struct platform_device * pdev)70 static int octeon_flash_probe(struct platform_device *pdev)
71 {
72 union cvmx_mio_boot_reg_cfgx region_cfg;
73 u32 cs;
74 int r;
75 struct device_node *np = pdev->dev.of_node;
76
77 r = of_property_read_u32(np, "reg", &cs);
78 if (r)
79 return r;
80
81 /*
82 * Read the bootbus region 0 setup to determine the base
83 * address of the flash.
84 */
85 region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
86 if (region_cfg.s.en) {
87 /*
88 * The bootloader always takes the flash and sets its
89 * address so the entire flash fits below
90 * 0x1fc00000. This way the flash aliases to
91 * 0x1fc00000 for booting. Software can access the
92 * full flash at the true address, while core boot can
93 * access 4MB.
94 */
95 /* Use this name so old part lines work */
96 flash_map.name = "phys_mapped_flash";
97 flash_map.phys = region_cfg.s.base << 16;
98 flash_map.size = 0x1fc00000 - flash_map.phys;
99 /* 8-bit bus (0 + 1) or 16-bit bus (1 + 1) */
100 flash_map.bankwidth = region_cfg.s.width + 1;
101 flash_map.virt = ioremap(flash_map.phys, flash_map.size);
102 pr_notice("Bootbus flash: Setting flash for %luMB flash at "
103 "0x%08llx\n", flash_map.size >> 20, flash_map.phys);
104 WARN_ON(!map_bankwidth_supported(flash_map.bankwidth));
105 flash_map.read = octeon_flash_map_read;
106 flash_map.write = octeon_flash_map_write;
107 flash_map.copy_from = octeon_flash_map_copy_from;
108 flash_map.copy_to = octeon_flash_map_copy_to;
109 mymtd = do_map_probe("cfi_probe", &flash_map);
110 if (mymtd) {
111 mymtd->owner = THIS_MODULE;
112 mtd_device_parse_register(mymtd, part_probe_types,
113 NULL, NULL, 0);
114 } else {
115 pr_err("Failed to register MTD device for flash\n");
116 }
117 }
118 return 0;
119 }
120
121 static const struct of_device_id of_flash_match[] = {
122 {
123 .compatible = "cfi-flash",
124 },
125 { },
126 };
127 MODULE_DEVICE_TABLE(of, of_flash_match);
128
129 static struct platform_driver of_flash_driver = {
130 .driver = {
131 .name = "octeon-of-flash",
132 .of_match_table = of_flash_match,
133 },
134 .probe = octeon_flash_probe,
135 };
136
octeon_flash_init(void)137 static int octeon_flash_init(void)
138 {
139 return platform_driver_register(&of_flash_driver);
140 }
141 late_initcall(octeon_flash_init);
142
143 MODULE_LICENSE("GPL");
144