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 <mach/hardware.h>
20
21 #include <asm/mach/flash.h>
22
23 #define CACHELINESIZE 32
24
pxa2xx_map_inval_cache(struct map_info * map,unsigned long from,ssize_t len)25 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
26 ssize_t len)
27 {
28 unsigned long start = (unsigned long)map->cached + from;
29 unsigned long end = start + len;
30
31 start &= ~(CACHELINESIZE - 1);
32 while (start < end) {
33 /* invalidate D cache line */
34 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
35 start += CACHELINESIZE;
36 }
37 }
38
39 struct pxa2xx_flash_info {
40 struct mtd_info *mtd;
41 struct map_info map;
42 };
43
44 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
45
pxa2xx_flash_probe(struct platform_device * pdev)46 static int pxa2xx_flash_probe(struct platform_device *pdev)
47 {
48 struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
49 struct pxa2xx_flash_info *info;
50 struct resource *res;
51
52 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
53 if (!res)
54 return -ENODEV;
55
56 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
57 if (!info)
58 return -ENOMEM;
59
60 info->map.name = flash->name;
61 info->map.bankwidth = flash->width;
62 info->map.phys = res->start;
63 info->map.size = resource_size(res);
64
65 info->map.virt = ioremap(info->map.phys, info->map.size);
66 if (!info->map.virt) {
67 printk(KERN_WARNING "Failed to ioremap %s\n",
68 info->map.name);
69 return -ENOMEM;
70 }
71 info->map.cached = ioremap_cache(info->map.phys, info->map.size);
72 if (!info->map.cached)
73 printk(KERN_WARNING "Failed to ioremap cached %s\n",
74 info->map.name);
75 info->map.inval_cache = pxa2xx_map_inval_cache;
76 simple_map_init(&info->map);
77
78 printk(KERN_NOTICE
79 "Probing %s at physical address 0x%08lx"
80 " (%d-bit bankwidth)\n",
81 info->map.name, (unsigned long)info->map.phys,
82 info->map.bankwidth * 8);
83
84 info->mtd = do_map_probe(flash->map_name, &info->map);
85
86 if (!info->mtd) {
87 iounmap((void *)info->map.virt);
88 if (info->map.cached)
89 iounmap(info->map.cached);
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 int 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 return 0;
113 }
114
115 #ifdef CONFIG_PM
pxa2xx_flash_shutdown(struct platform_device * dev)116 static void pxa2xx_flash_shutdown(struct platform_device *dev)
117 {
118 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
119
120 if (info && mtd_suspend(info->mtd) == 0)
121 mtd_resume(info->mtd);
122 }
123 #else
124 #define pxa2xx_flash_shutdown NULL
125 #endif
126
127 static struct platform_driver pxa2xx_flash_driver = {
128 .driver = {
129 .name = "pxa2xx-flash",
130 },
131 .probe = pxa2xx_flash_probe,
132 .remove = pxa2xx_flash_remove,
133 .shutdown = pxa2xx_flash_shutdown,
134 };
135
136 module_platform_driver(pxa2xx_flash_driver);
137
138 MODULE_LICENSE("GPL");
139 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
140 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
141