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Linux/drivers/mtd/maps/pxa2xx-flash.c

  1 /*
  2  * Map driver for Intel XScale PXA2xx platforms.
  3  *
  4  * Author:      Nicolas Pitre
  5  * Copyright:   (C) 2001 MontaVista Software Inc.
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/types.h>
 14 #include <linux/slab.h>
 15 #include <linux/kernel.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/mtd/mtd.h>
 18 #include <linux/mtd/map.h>
 19 #include <linux/mtd/partitions.h>
 20 
 21 #include <asm/io.h>
 22 #include <mach/hardware.h>
 23 
 24 #include <asm/mach/flash.h>
 25 
 26 #define CACHELINESIZE   32
 27 
 28 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
 29                                       ssize_t len)
 30 {
 31         unsigned long start = (unsigned long)map->cached + from;
 32         unsigned long end = start + len;
 33 
 34         start &= ~(CACHELINESIZE - 1);
 35         while (start < end) {
 36                 /* invalidate D cache line */
 37                 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
 38                 start += CACHELINESIZE;
 39         }
 40 }
 41 
 42 struct pxa2xx_flash_info {
 43         struct mtd_info         *mtd;
 44         struct map_info         map;
 45 };
 46 
 47 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
 48 
 49 static int pxa2xx_flash_probe(struct platform_device *pdev)
 50 {
 51         struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
 52         struct pxa2xx_flash_info *info;
 53         struct resource *res;
 54 
 55         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 56         if (!res)
 57                 return -ENODEV;
 58 
 59         info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
 60         if (!info)
 61                 return -ENOMEM;
 62 
 63         info->map.name = flash->name;
 64         info->map.bankwidth = flash->width;
 65         info->map.phys = res->start;
 66         info->map.size = resource_size(res);
 67 
 68         info->map.virt = ioremap(info->map.phys, info->map.size);
 69         if (!info->map.virt) {
 70                 printk(KERN_WARNING "Failed to ioremap %s\n",
 71                        info->map.name);
 72                 return -ENOMEM;
 73         }
 74         info->map.cached =
 75                 ioremap_cache(info->map.phys, info->map.size);
 76         if (!info->map.cached)
 77                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
 78                        info->map.name);
 79         info->map.inval_cache = pxa2xx_map_inval_cache;
 80         simple_map_init(&info->map);
 81 
 82         printk(KERN_NOTICE
 83                "Probing %s at physical address 0x%08lx"
 84                " (%d-bit bankwidth)\n",
 85                info->map.name, (unsigned long)info->map.phys,
 86                info->map.bankwidth * 8);
 87 
 88         info->mtd = do_map_probe(flash->map_name, &info->map);
 89 
 90         if (!info->mtd) {
 91                 iounmap((void *)info->map.virt);
 92                 if (info->map.cached)
 93                         iounmap(info->map.cached);
 94                 return -EIO;
 95         }
 96         info->mtd->owner = THIS_MODULE;
 97 
 98         mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
 99                                   flash->nr_parts);
100 
101         platform_set_drvdata(pdev, info);
102         return 0;
103 }
104 
105 static int pxa2xx_flash_remove(struct platform_device *dev)
106 {
107         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
108 
109         mtd_device_unregister(info->mtd);
110 
111         map_destroy(info->mtd);
112         iounmap(info->map.virt);
113         if (info->map.cached)
114                 iounmap(info->map.cached);
115         kfree(info);
116         return 0;
117 }
118 
119 #ifdef CONFIG_PM
120 static void pxa2xx_flash_shutdown(struct platform_device *dev)
121 {
122         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
123 
124         if (info && mtd_suspend(info->mtd) == 0)
125                 mtd_resume(info->mtd);
126 }
127 #else
128 #define pxa2xx_flash_shutdown NULL
129 #endif
130 
131 static struct platform_driver pxa2xx_flash_driver = {
132         .driver = {
133                 .name           = "pxa2xx-flash",
134                 .owner          = THIS_MODULE,
135         },
136         .probe          = pxa2xx_flash_probe,
137         .remove         = pxa2xx_flash_remove,
138         .shutdown       = pxa2xx_flash_shutdown,
139 };
140 
141 module_platform_driver(pxa2xx_flash_driver);
142 
143 MODULE_LICENSE("GPL");
144 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
145 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
146 

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