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69f34c98 | 1 | /* $Id: sun_uflash.c,v 1.13 2005/11/07 11:14:28 gleixner Exp $ |
1da177e4 LT |
2 | * |
3 | * sun_uflash - Driver implementation for user-programmable flash | |
4 | * present on many Sun Microsystems SME boardsets. | |
5 | * | |
6 | * This driver does NOT provide access to the OBP-flash for | |
7 | * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead. | |
8 | * | |
9 | * Copyright (c) 2001 Eric Brower (ebrower@usa.net) | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/ioport.h> | |
19 | #include <asm/ebus.h> | |
20 | #include <asm/oplib.h> | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/io.h> | |
23 | ||
24 | #include <linux/mtd/mtd.h> | |
25 | #include <linux/mtd/map.h> | |
26 | ||
27 | #define UFLASH_OBPNAME "flashprom" | |
28 | #define UFLASH_DEVNAME "userflash" | |
29 | ||
30 | #define UFLASH_WINDOW_SIZE 0x200000 | |
31 | #define UFLASH_BUSWIDTH 1 /* EBus is 8-bit */ | |
32 | ||
33 | MODULE_AUTHOR | |
34 | ("Eric Brower <ebrower@usa.net>"); | |
35 | MODULE_DESCRIPTION | |
36 | ("User-programmable flash device on Sun Microsystems boardsets"); | |
37 | MODULE_SUPPORTED_DEVICE | |
38 | ("userflash"); | |
39 | MODULE_LICENSE | |
40 | ("GPL"); | |
41 | ||
42 | static LIST_HEAD(device_list); | |
43 | struct uflash_dev { | |
44 | char * name; /* device name */ | |
45 | struct map_info map; /* mtd map info */ | |
46 | struct mtd_info * mtd; /* mtd info */ | |
47 | struct list_head list; | |
48 | }; | |
49 | ||
50 | ||
51 | struct map_info uflash_map_templ = { | |
52 | .name = "SUNW,???-????", | |
53 | .size = UFLASH_WINDOW_SIZE, | |
54 | .bankwidth = UFLASH_BUSWIDTH, | |
55 | }; | |
56 | ||
57 | int uflash_devinit(struct linux_ebus_device* edev) | |
58 | { | |
59 | int iTmp, nregs; | |
60 | struct linux_prom_registers regs[2]; | |
61 | struct uflash_dev *pdev; | |
62 | ||
63 | iTmp = prom_getproperty( | |
64 | edev->prom_node, "reg", (void *)regs, sizeof(regs)); | |
65 | if ((iTmp % sizeof(regs[0])) != 0) { | |
69f34c98 | 66 | printk("%s: Strange reg property size %d\n", |
1da177e4 LT |
67 | UFLASH_DEVNAME, iTmp); |
68 | return -ENODEV; | |
69 | } | |
70 | ||
71 | nregs = iTmp / sizeof(regs[0]); | |
72 | ||
73 | if (nregs != 1) { | |
74 | /* Non-CFI userflash device-- once I find one we | |
75 | * can work on supporting it. | |
76 | */ | |
77 | printk("%s: unsupported device at 0x%lx (%d regs): " \ | |
69f34c98 | 78 | "email ebrower@usa.net\n", |
1da177e4 LT |
79 | UFLASH_DEVNAME, edev->resource[0].start, nregs); |
80 | return -ENODEV; | |
81 | } | |
82 | ||
83 | if(0 == (pdev = kmalloc(sizeof(struct uflash_dev), GFP_KERNEL))) { | |
84 | printk("%s: unable to kmalloc new device\n", UFLASH_DEVNAME); | |
85 | return(-ENOMEM); | |
86 | } | |
69f34c98 | 87 | |
1da177e4 LT |
88 | /* copy defaults and tweak parameters */ |
89 | memcpy(&pdev->map, &uflash_map_templ, sizeof(uflash_map_templ)); | |
90 | pdev->map.size = regs[0].reg_size; | |
91 | ||
92 | iTmp = prom_getproplen(edev->prom_node, "model"); | |
93 | pdev->name = kmalloc(iTmp, GFP_KERNEL); | |
94 | prom_getstring(edev->prom_node, "model", pdev->name, iTmp); | |
95 | if(0 != pdev->name && 0 < strlen(pdev->name)) { | |
96 | pdev->map.name = pdev->name; | |
97 | } | |
98 | pdev->map.phys = edev->resource[0].start; | |
99 | pdev->map.virt = ioremap_nocache(edev->resource[0].start, pdev->map.size); | |
100 | if(0 == pdev->map.virt) { | |
101 | printk("%s: failed to map device\n", __FUNCTION__); | |
102 | kfree(pdev->name); | |
103 | kfree(pdev); | |
104 | return(-1); | |
105 | } | |
106 | ||
107 | simple_map_init(&pdev->map); | |
108 | ||
109 | /* MTD registration */ | |
110 | pdev->mtd = do_map_probe("cfi_probe", &pdev->map); | |
111 | if(0 == pdev->mtd) { | |
112 | iounmap(pdev->map.virt); | |
113 | kfree(pdev->name); | |
114 | kfree(pdev); | |
115 | return(-ENXIO); | |
116 | } | |
117 | ||
118 | list_add(&pdev->list, &device_list); | |
119 | ||
120 | pdev->mtd->owner = THIS_MODULE; | |
121 | ||
122 | add_mtd_device(pdev->mtd); | |
123 | return(0); | |
124 | } | |
125 | ||
126 | static int __init uflash_init(void) | |
127 | { | |
128 | struct linux_ebus *ebus = NULL; | |
129 | struct linux_ebus_device *edev = NULL; | |
130 | ||
131 | for_each_ebus(ebus) { | |
132 | for_each_ebusdev(edev, ebus) { | |
133 | if (!strcmp(edev->prom_name, UFLASH_OBPNAME)) { | |
134 | if(0 > prom_getproplen(edev->prom_node, "user")) { | |
135 | DEBUG(2, "%s: ignoring device at 0x%lx\n", | |
136 | UFLASH_DEVNAME, edev->resource[0].start); | |
137 | } else { | |
138 | uflash_devinit(edev); | |
139 | } | |
140 | } | |
141 | } | |
142 | } | |
143 | ||
144 | if(list_empty(&device_list)) { | |
145 | printk("%s: unable to locate device\n", UFLASH_DEVNAME); | |
146 | return -ENODEV; | |
147 | } | |
148 | return(0); | |
149 | } | |
150 | ||
151 | static void __exit uflash_cleanup(void) | |
152 | { | |
153 | struct list_head *udevlist; | |
154 | struct uflash_dev *udev; | |
155 | ||
156 | list_for_each(udevlist, &device_list) { | |
157 | udev = list_entry(udevlist, struct uflash_dev, list); | |
69f34c98 | 158 | DEBUG(2, "%s: removing device %s\n", |
1da177e4 LT |
159 | UFLASH_DEVNAME, udev->name); |
160 | ||
161 | if(0 != udev->mtd) { | |
162 | del_mtd_device(udev->mtd); | |
163 | map_destroy(udev->mtd); | |
164 | } | |
165 | if(0 != udev->map.virt) { | |
166 | iounmap(udev->map.virt); | |
167 | udev->map.virt = NULL; | |
168 | } | |
fa671646 | 169 | kfree(udev->name); |
1da177e4 | 170 | kfree(udev); |
69f34c98 | 171 | } |
1da177e4 LT |
172 | } |
173 | ||
174 | module_init(uflash_init); | |
175 | module_exit(uflash_cleanup); |