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.h>
16 #include <linux/platform_device.h>
17 #include <linux/mtd/partitions.h>
18
19 #include <asm/octeon/octeon.h>
20
21 static struct map_info flash_map;
22 static struct mtd_info *mymtd;
23 static const char *part_probe_types[] = {
24 "cmdlinepart",
25 #ifdef CONFIG_MTD_REDBOOT_PARTS
26 "RedBoot",
27 #endif
28 NULL
29 };
30
31 static map_word octeon_flash_map_read(struct map_info *map, unsigned long ofs)
32 {
33 map_word r;
34
35 down(&octeon_bootbus_sem);
36 r = inline_map_read(map, ofs);
37 up(&octeon_bootbus_sem);
38
39 return r;
40 }
41
42 static void octeon_flash_map_write(struct map_info *map, const map_word datum,
43 unsigned long ofs)
44 {
45 down(&octeon_bootbus_sem);
46 inline_map_write(map, datum, ofs);
47 up(&octeon_bootbus_sem);
48 }
49
50 static void octeon_flash_map_copy_from(struct map_info *map, void *to,
51 unsigned long from, ssize_t len)
52 {
53 down(&octeon_bootbus_sem);
54 inline_map_copy_from(map, to, from, len);
55 up(&octeon_bootbus_sem);
56 }
57
58 static void octeon_flash_map_copy_to(struct map_info *map, unsigned long to,
59 const void *from, ssize_t len)
60 {
61 down(&octeon_bootbus_sem);
62 inline_map_copy_to(map, to, from, len);
63 up(&octeon_bootbus_sem);
64 }
65
66 /*
67 * Module/ driver initialization.
68 *
69 * Returns Zero on success
70 */
71 static int octeon_flash_probe(struct platform_device *pdev)
72 {
73 union cvmx_mio_boot_reg_cfgx region_cfg;
74 u32 cs;
75 int r;
76 struct device_node *np = pdev->dev.of_node;
77
78 r = of_property_read_u32(np, "reg", &cs);
79 if (r)
80 return r;
81
82 /*
83 * Read the bootbus region 0 setup to determine the base
84 * address of the flash.
85 */
86 region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
87 if (region_cfg.s.en) {
88 /*
89 * The bootloader always takes the flash and sets its
90 * address so the entire flash fits below
91 * 0x1fc00000. This way the flash aliases to
92 * 0x1fc00000 for booting. Software can access the
93 * full flash at the true address, while core boot can
94 * access 4MB.
95 */
96 /* Use this name so old part lines work */
97 flash_map.name = "phys_mapped_flash";
98 flash_map.phys = region_cfg.s.base << 16;
99 flash_map.size = 0x1fc00000 - flash_map.phys;
100 /* 8-bit bus (0 + 1) or 16-bit bus (1 + 1) */
101 flash_map.bankwidth = region_cfg.s.width + 1;
102 flash_map.virt = ioremap(flash_map.phys, flash_map.size);
103 pr_notice("Bootbus flash: Setting flash for %luMB flash at "
104 "0x%08llx\n", flash_map.size >> 20, flash_map.phys);
105 WARN_ON(!map_bankwidth_supported(flash_map.bankwidth));
106 flash_map.read = octeon_flash_map_read;
107 flash_map.write = octeon_flash_map_write;
108 flash_map.copy_from = octeon_flash_map_copy_from;
109 flash_map.copy_to = octeon_flash_map_copy_to;
110 mymtd = do_map_probe("cfi_probe", &flash_map);
111 if (mymtd) {
112 mymtd->owner = THIS_MODULE;
113 mtd_device_parse_register(mymtd, part_probe_types,
114 NULL, NULL, 0);
115 } else {
116 pr_err("Failed to register MTD device for flash\n");
117 }
118 }
119 return 0;
120 }
121
122 static const struct of_device_id of_flash_match[] = {
123 {
124 .compatible = "cfi-flash",
125 },
126 { },
127 };
128 MODULE_DEVICE_TABLE(of, of_flash_match);
129
130 static struct platform_driver of_flash_driver = {
131 .driver = {
132 .name = "octeon-of-flash",
133 .of_match_table = of_flash_match,
134 },
135 .probe = octeon_flash_probe,
136 };
137
138 static int octeon_flash_init(void)
139 {
140 return platform_driver_register(&of_flash_driver);
141 }
142 late_initcall(octeon_flash_init);
143
144 MODULE_LICENSE("GPL");
145
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