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 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