1 /* $Id: sun_uflash.c,v 1.11 2004/11/04 13:24:15 gleixner Exp $
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) {
66 printk("%s: Strange reg property size %d\n",
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): " \
78 "email ebrower@usa.net\n",
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 }
87
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);
158 DEBUG(2, "%s: removing device %s\n",
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 }
169 if(0 != udev->name) {
170 kfree(udev->name);
171 }
172 kfree(udev);
173 }
174 }
175
176 module_init(uflash_init);
177 module_exit(uflash_cleanup);
178
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