Merge branch 'linux-next' of git://git.infradead.org/~dedekind/ubi-2.6
[linux-3.10.git] / drivers / mtd / maps / scx200_docflash.c
1 /* linux/drivers/mtd/maps/scx200_docflash.c
2
3    Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
4
5    National Semiconductor SCx200 flash mapped with DOCCS
6 */
7
8 #include <linux/module.h>
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <asm/io.h>
13 #include <linux/mtd/mtd.h>
14 #include <linux/mtd/map.h>
15 #include <linux/mtd/partitions.h>
16
17 #include <linux/pci.h>
18 #include <linux/scx200.h>
19
20 #define NAME "scx200_docflash"
21
22 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
23 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
24 MODULE_LICENSE("GPL");
25
26 static int probe = 0;           /* Don't autoprobe */
27 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
28 static unsigned width = 8;      /* Default to 8 bits wide */
29 static char *flashtype = "cfi_probe";
30
31 module_param(probe, int, 0);
32 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
33 module_param(size, int, 0);
34 MODULE_PARM_DESC(size, "Size of the flash mapping");
35 module_param(width, int, 0);
36 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
37 module_param(flashtype, charp, 0);
38 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
39
40 static struct resource docmem = {
41         .flags = IORESOURCE_MEM,
42         .name  = "NatSemi SCx200 DOCCS Flash",
43 };
44
45 static struct mtd_info *mymtd;
46
47 #ifdef CONFIG_MTD_PARTITIONS
48 static struct mtd_partition partition_info[] = {
49         {
50                 .name   = "DOCCS Boot kernel",
51                 .offset = 0,
52                 .size   = 0xc0000
53         },
54         {
55                 .name   = "DOCCS Low BIOS",
56                 .offset = 0xc0000,
57                 .size   = 0x40000
58         },
59         {
60                 .name   = "DOCCS File system",
61                 .offset = 0x100000,
62                 .size   = ~0    /* calculate from flash size */
63         },
64         {
65                 .name   = "DOCCS High BIOS",
66                 .offset = ~0,   /* calculate from flash size */
67                 .size   = 0x80000
68         },
69 };
70 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
71 #endif
72
73
74 static struct map_info scx200_docflash_map = {
75         .name      = "NatSemi SCx200 DOCCS Flash",
76 };
77
78 static int __init init_scx200_docflash(void)
79 {
80         unsigned u;
81         unsigned base;
82         unsigned ctrl;
83         unsigned pmr;
84         struct pci_dev *bridge;
85
86         printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
87
88         if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
89                                       PCI_DEVICE_ID_NS_SCx200_BRIDGE,
90                                       NULL)) == NULL)
91                 return -ENODEV;
92
93         /* check that we have found the configuration block */
94         if (!scx200_cb_present()) {
95                 pci_dev_put(bridge);
96                 return -ENODEV;
97         }
98
99         if (probe) {
100                 /* Try to use the present flash mapping if any */
101                 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
102                 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
103                 pci_dev_put(bridge);
104
105                 pmr = inl(scx200_cb_base + SCx200_PMR);
106
107                 if (base == 0
108                     || (ctrl & 0x07000000) != 0x07000000
109                     || (ctrl & 0x0007ffff) == 0)
110                         return -ENODEV;
111
112                 size = ((ctrl&0x1fff)<<13) + (1<<13);
113
114                 for (u = size; u > 1; u >>= 1)
115                         ;
116                 if (u != 1)
117                         return -ENODEV;
118
119                 if (pmr & (1<<6))
120                         width = 16;
121                 else
122                         width = 8;
123
124                 docmem.start = base;
125                 docmem.end = base + size;
126
127                 if (request_resource(&iomem_resource, &docmem)) {
128                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
129                         return -ENOMEM;
130                 }
131         } else {
132                 pci_dev_put(bridge);
133                 for (u = size; u > 1; u >>= 1)
134                         ;
135                 if (u != 1) {
136                         printk(KERN_ERR NAME ": invalid size for flash mapping\n");
137                         return -EINVAL;
138                 }
139
140                 if (width != 8 && width != 16) {
141                         printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
142                         return -EINVAL;
143                 }
144
145                 if (allocate_resource(&iomem_resource, &docmem,
146                                       size,
147                                       0xc0000000, 0xffffffff,
148                                       size, NULL, NULL)) {
149                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
150                         return -ENOMEM;
151                 }
152
153                 ctrl = 0x07000000 | ((size-1) >> 13);
154
155                 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
156
157                 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
158                 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
159                 pmr = inl(scx200_cb_base + SCx200_PMR);
160
161                 if (width == 8) {
162                         pmr &= ~(1<<6);
163                 } else {
164                         pmr |= (1<<6);
165                 }
166                 outl(pmr, scx200_cb_base + SCx200_PMR);
167         }
168
169         printk(KERN_INFO NAME ": DOCCS mapped at 0x%llx-0x%llx, width %d\n",
170                         (unsigned long long)docmem.start,
171                         (unsigned long long)docmem.end, width);
172
173         scx200_docflash_map.size = size;
174         if (width == 8)
175                 scx200_docflash_map.bankwidth = 1;
176         else
177                 scx200_docflash_map.bankwidth = 2;
178
179         simple_map_init(&scx200_docflash_map);
180
181         scx200_docflash_map.phys = docmem.start;
182         scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
183         if (!scx200_docflash_map.virt) {
184                 printk(KERN_ERR NAME ": failed to ioremap the flash\n");
185                 release_resource(&docmem);
186                 return -EIO;
187         }
188
189         mymtd = do_map_probe(flashtype, &scx200_docflash_map);
190         if (!mymtd) {
191                 printk(KERN_ERR NAME ": unable to detect flash\n");
192                 iounmap(scx200_docflash_map.virt);
193                 release_resource(&docmem);
194                 return -ENXIO;
195         }
196
197         if (size < mymtd->size)
198                 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
199
200         mymtd->owner = THIS_MODULE;
201
202 #ifdef CONFIG_MTD_PARTITIONS
203         partition_info[3].offset = mymtd->size-partition_info[3].size;
204         partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
205         add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
206 #else
207         add_mtd_device(mymtd);
208 #endif
209         return 0;
210 }
211
212 static void __exit cleanup_scx200_docflash(void)
213 {
214         if (mymtd) {
215 #ifdef CONFIG_MTD_PARTITIONS
216                 del_mtd_partitions(mymtd);
217 #else
218                 del_mtd_device(mymtd);
219 #endif
220                 map_destroy(mymtd);
221         }
222         if (scx200_docflash_map.virt) {
223                 iounmap(scx200_docflash_map.virt);
224                 release_resource(&docmem);
225         }
226 }
227
228 module_init(init_scx200_docflash);
229 module_exit(cleanup_scx200_docflash);
230
231 /*
232     Local variables:
233         compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
234         c-basic-offset: 8
235     End:
236 */