1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Map driver for Intel XScale PXA2xx platforms.
4 *
5 * Author: Nicolas Pitre
6 * Copyright: (C) 2001 MontaVista Software Inc.
7 */
8
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/slab.h>
12 #include <linux/kernel.h>
13 #include <linux/platform_device.h>
14 #include <linux/mtd/mtd.h>
15 #include <linux/mtd/map.h>
16 #include <linux/mtd/partitions.h>
17
18 #include <asm/io.h>
19 #include <asm/mach/flash.h>
20
21 #define CACHELINESIZE 32
22
pxa2xx_map_inval_cache(struct map_info * map,unsigned long from,ssize_t len)23 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
24 ssize_t len)
25 {
26 unsigned long start = (unsigned long)map->cached + from;
27 unsigned long end = start + len;
28
29 start &= ~(CACHELINESIZE - 1);
30 while (start < end) {
31 /* invalidate D cache line */
32 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
33 start += CACHELINESIZE;
34 }
35 }
36
37 struct pxa2xx_flash_info {
38 struct mtd_info *mtd;
39 struct map_info map;
40 };
41
42 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
43
pxa2xx_flash_probe(struct platform_device * pdev)44 static int pxa2xx_flash_probe(struct platform_device *pdev)
45 {
46 struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
47 struct pxa2xx_flash_info *info;
48 struct resource *res;
49
50 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
51 if (!res)
52 return -ENODEV;
53
54 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
55 if (!info)
56 return -ENOMEM;
57
58 info->map.name = flash->name;
59 info->map.bankwidth = flash->width;
60 info->map.phys = res->start;
61 info->map.size = resource_size(res);
62
63 info->map.virt = ioremap(info->map.phys, info->map.size);
64 if (!info->map.virt) {
65 printk(KERN_WARNING "Failed to ioremap %s\n",
66 info->map.name);
67 kfree(info);
68 return -ENOMEM;
69 }
70 info->map.cached = ioremap_cache(info->map.phys, info->map.size);
71 if (!info->map.cached)
72 printk(KERN_WARNING "Failed to ioremap cached %s\n",
73 info->map.name);
74 info->map.inval_cache = pxa2xx_map_inval_cache;
75 simple_map_init(&info->map);
76
77 printk(KERN_NOTICE
78 "Probing %s at physical address 0x%08lx"
79 " (%d-bit bankwidth)\n",
80 info->map.name, (unsigned long)info->map.phys,
81 info->map.bankwidth * 8);
82
83 info->mtd = do_map_probe(flash->map_name, &info->map);
84
85 if (!info->mtd) {
86 iounmap((void *)info->map.virt);
87 if (info->map.cached)
88 iounmap(info->map.cached);
89 kfree(info);
90 return -EIO;
91 }
92 info->mtd->dev.parent = &pdev->dev;
93
94 mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
95 flash->nr_parts);
96
97 platform_set_drvdata(pdev, info);
98 return 0;
99 }
100
pxa2xx_flash_remove(struct platform_device * dev)101 static void pxa2xx_flash_remove(struct platform_device *dev)
102 {
103 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
104
105 mtd_device_unregister(info->mtd);
106
107 map_destroy(info->mtd);
108 iounmap(info->map.virt);
109 if (info->map.cached)
110 iounmap(info->map.cached);
111 kfree(info);
112 }
113
114 #ifdef CONFIG_PM
pxa2xx_flash_shutdown(struct platform_device * dev)115 static void pxa2xx_flash_shutdown(struct platform_device *dev)
116 {
117 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
118
119 if (info && mtd_suspend(info->mtd) == 0)
120 mtd_resume(info->mtd);
121 }
122 #else
123 #define pxa2xx_flash_shutdown NULL
124 #endif
125
126 static struct platform_driver pxa2xx_flash_driver = {
127 .driver = {
128 .name = "pxa2xx-flash",
129 },
130 .probe = pxa2xx_flash_probe,
131 .remove = pxa2xx_flash_remove,
132 .shutdown = pxa2xx_flash_shutdown,
133 };
134
135 module_platform_driver(pxa2xx_flash_driver);
136
137 MODULE_LICENSE("GPL");
138 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
139 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
140