1 /* sun_uflash.c - Driver for user-programmable flash on 2 * Sun Microsystems SME boardsets. 3 * 4 * This driver does NOT provide access to the OBP-flash for 5 * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead. 6 * 7 * Copyright (c) 2001 Eric Brower (ebrower@usa.net) 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/fs.h> 13 #include <linux/errno.h> 14 #include <linux/ioport.h> 15 #include <linux/of.h> 16 #include <linux/of_device.h> 17 #include <linux/slab.h> 18 #include <asm/prom.h> 19 #include <linux/uaccess.h> 20 #include <asm/io.h> 21 22 #include <linux/mtd/mtd.h> 23 #include <linux/mtd/map.h> 24 25 #define UFLASH_OBPNAME "flashprom" 26 #define DRIVER_NAME "sun_uflash" 27 #define PFX DRIVER_NAME ": " 28 29 #define UFLASH_WINDOW_SIZE 0x200000 30 #define UFLASH_BUSWIDTH 1 /* EBus is 8-bit */ 31 32 MODULE_AUTHOR("Eric Brower <ebrower@usa.net>"); 33 MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets"); 34 MODULE_SUPPORTED_DEVICE(DRIVER_NAME); 35 MODULE_LICENSE("GPL"); 36 MODULE_VERSION("2.1"); 37 38 struct uflash_dev { 39 const char *name; /* device name */ 40 struct map_info map; /* mtd map info */ 41 struct mtd_info *mtd; /* mtd info */ 42 }; 43 44 struct map_info uflash_map_templ = { 45 .name = "SUNW,???-????", 46 .size = UFLASH_WINDOW_SIZE, 47 .bankwidth = UFLASH_BUSWIDTH, 48 }; 49 50 int uflash_devinit(struct platform_device *op, struct device_node *dp) 51 { 52 struct uflash_dev *up; 53 54 if (op->resource[1].flags) { 55 /* Non-CFI userflash device-- once I find one we 56 * can work on supporting it. 57 */ 58 printk(KERN_ERR PFX "Unsupported device at %pOF, 0x%llx\n", 59 dp, (unsigned long long)op->resource[0].start); 60 61 return -ENODEV; 62 } 63 64 up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL); 65 if (!up) { 66 printk(KERN_ERR PFX "Cannot allocate struct uflash_dev\n"); 67 return -ENOMEM; 68 } 69 70 /* copy defaults and tweak parameters */ 71 memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ)); 72 73 up->map.size = resource_size(&op->resource[0]); 74 75 up->name = of_get_property(dp, "model", NULL); 76 if (up->name && 0 < strlen(up->name)) 77 up->map.name = up->name; 78 79 up->map.phys = op->resource[0].start; 80 81 up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size, 82 DRIVER_NAME); 83 if (!up->map.virt) { 84 printk(KERN_ERR PFX "Failed to map device.\n"); 85 kfree(up); 86 87 return -EINVAL; 88 } 89 90 simple_map_init(&up->map); 91 92 /* MTD registration */ 93 up->mtd = do_map_probe("cfi_probe", &up->map); 94 if (!up->mtd) { 95 of_iounmap(&op->resource[0], up->map.virt, up->map.size); 96 kfree(up); 97 98 return -ENXIO; 99 } 100 101 up->mtd->owner = THIS_MODULE; 102 103 mtd_device_register(up->mtd, NULL, 0); 104 105 dev_set_drvdata(&op->dev, up); 106 107 return 0; 108 } 109 110 static int uflash_probe(struct platform_device *op) 111 { 112 struct device_node *dp = op->dev.of_node; 113 114 /* Flashprom must have the "user" property in order to 115 * be used by this driver. 116 */ 117 if (!of_find_property(dp, "user", NULL)) 118 return -ENODEV; 119 120 return uflash_devinit(op, dp); 121 } 122 123 static int uflash_remove(struct platform_device *op) 124 { 125 struct uflash_dev *up = dev_get_drvdata(&op->dev); 126 127 if (up->mtd) { 128 mtd_device_unregister(up->mtd); 129 map_destroy(up->mtd); 130 } 131 if (up->map.virt) { 132 of_iounmap(&op->resource[0], up->map.virt, up->map.size); 133 up->map.virt = NULL; 134 } 135 136 kfree(up); 137 138 return 0; 139 } 140 141 static const struct of_device_id uflash_match[] = { 142 { 143 .name = UFLASH_OBPNAME, 144 }, 145 {}, 146 }; 147 148 MODULE_DEVICE_TABLE(of, uflash_match); 149 150 static struct platform_driver uflash_driver = { 151 .driver = { 152 .name = DRIVER_NAME, 153 .of_match_table = uflash_match, 154 }, 155 .probe = uflash_probe, 156 .remove = uflash_remove, 157 }; 158 159 module_platform_driver(uflash_driver); 160