7391fd544e86fc7351e46fb4efa209afe31fbb25
[linux-2.6.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    $Id: scx200_docflash.c,v 1.12 2005/11/07 11:14:28 gleixner Exp $
6
7    National Semiconductor SCx200 flash mapped with DOCCS
8 */
9
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <asm/io.h>
15 #include <linux/mtd/mtd.h>
16 #include <linux/mtd/map.h>
17 #include <linux/mtd/partitions.h>
18
19 #include <linux/pci.h>
20 #include <linux/scx200.h>
21
22 #define NAME "scx200_docflash"
23
24 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
25 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
26 MODULE_LICENSE("GPL");
27
28 static int probe = 0;           /* Don't autoprobe */
29 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
30 static unsigned width = 8;      /* Default to 8 bits wide */
31 static char *flashtype = "cfi_probe";
32
33 module_param(probe, int, 0);
34 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
35 module_param(size, int, 0);
36 MODULE_PARM_DESC(size, "Size of the flash mapping");
37 module_param(width, int, 0);
38 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
39 module_param(flashtype, charp, 0);
40 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
41
42 static struct resource docmem = {
43         .flags = IORESOURCE_MEM,
44         .name  = "NatSemi SCx200 DOCCS Flash",
45 };
46
47 static struct mtd_info *mymtd;
48
49 #ifdef CONFIG_MTD_PARTITIONS
50 static struct mtd_partition partition_info[] = {
51         {
52                 .name   = "DOCCS Boot kernel",
53                 .offset = 0,
54                 .size   = 0xc0000
55         },
56         {
57                 .name   = "DOCCS Low BIOS",
58                 .offset = 0xc0000,
59                 .size   = 0x40000
60         },
61         {
62                 .name   = "DOCCS File system",
63                 .offset = 0x100000,
64                 .size   = ~0    /* calculate from flash size */
65         },
66         {
67                 .name   = "DOCCS High BIOS",
68                 .offset = ~0,   /* calculate from flash size */
69                 .size   = 0x80000
70         },
71 };
72 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
73 #endif
74
75
76 static struct map_info scx200_docflash_map = {
77         .name      = "NatSemi SCx200 DOCCS Flash",
78 };
79
80 static int __init init_scx200_docflash(void)
81 {
82         unsigned u;
83         unsigned base;
84         unsigned ctrl;
85         unsigned pmr;
86         struct pci_dev *bridge;
87
88         printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
89
90         if ((bridge = pci_find_device(PCI_VENDOR_ID_NS,
91                                       PCI_DEVICE_ID_NS_SCx200_BRIDGE,
92                                       NULL)) == NULL)
93                 return -ENODEV;
94
95         /* check that we have found the configuration block */
96         if (!scx200_cb_present())
97                 return -ENODEV;
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                 pmr = inl(scx200_cb_base + SCx200_PMR);
104
105                 if (base == 0
106                     || (ctrl & 0x07000000) != 0x07000000
107                     || (ctrl & 0x0007ffff) == 0)
108                         return -ENODEV;
109
110                 size = ((ctrl&0x1fff)<<13) + (1<<13);
111
112                 for (u = size; u > 1; u >>= 1)
113                         ;
114                 if (u != 1)
115                         return -ENODEV;
116
117                 if (pmr & (1<<6))
118                         width = 16;
119                 else
120                         width = 8;
121
122                 docmem.start = base;
123                 docmem.end = base + size;
124
125                 if (request_resource(&iomem_resource, &docmem)) {
126                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
127                         return -ENOMEM;
128                 }
129         } else {
130                 for (u = size; u > 1; u >>= 1)
131                         ;
132                 if (u != 1) {
133                         printk(KERN_ERR NAME ": invalid size for flash mapping\n");
134                         return -EINVAL;
135                 }
136
137                 if (width != 8 && width != 16) {
138                         printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
139                         return -EINVAL;
140                 }
141
142                 if (allocate_resource(&iomem_resource, &docmem,
143                                       size,
144                                       0xc0000000, 0xffffffff,
145                                       size, NULL, NULL)) {
146                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
147                         return -ENOMEM;
148                 }
149
150                 ctrl = 0x07000000 | ((size-1) >> 13);
151
152                 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
153
154                 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
155                 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
156                 pmr = inl(scx200_cb_base + SCx200_PMR);
157
158                 if (width == 8) {
159                         pmr &= ~(1<<6);
160                 } else {
161                         pmr |= (1<<6);
162                 }
163                 outl(pmr, scx200_cb_base + SCx200_PMR);
164         }
165
166         printk(KERN_INFO NAME ": DOCCS mapped at 0x%llx-0x%llx, width %d\n",
167                         (unsigned long long)docmem.start,
168                         (unsigned long long)docmem.end, width);
169
170         scx200_docflash_map.size = size;
171         if (width == 8)
172                 scx200_docflash_map.bankwidth = 1;
173         else
174                 scx200_docflash_map.bankwidth = 2;
175
176         simple_map_init(&scx200_docflash_map);
177
178         scx200_docflash_map.phys = docmem.start;
179         scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
180         if (!scx200_docflash_map.virt) {
181                 printk(KERN_ERR NAME ": failed to ioremap the flash\n");
182                 release_resource(&docmem);
183                 return -EIO;
184         }
185
186         mymtd = do_map_probe(flashtype, &scx200_docflash_map);
187         if (!mymtd) {
188                 printk(KERN_ERR NAME ": unable to detect flash\n");
189                 iounmap(scx200_docflash_map.virt);
190                 release_resource(&docmem);
191                 return -ENXIO;
192         }
193
194         if (size < mymtd->size)
195                 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
196
197         mymtd->owner = THIS_MODULE;
198
199 #ifdef CONFIG_MTD_PARTITIONS
200         partition_info[3].offset = mymtd->size-partition_info[3].size;
201         partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
202         add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
203 #else
204         add_mtd_device(mymtd);
205 #endif
206         return 0;
207 }
208
209 static void __exit cleanup_scx200_docflash(void)
210 {
211         if (mymtd) {
212 #ifdef CONFIG_MTD_PARTITIONS
213                 del_mtd_partitions(mymtd);
214 #else
215                 del_mtd_device(mymtd);
216 #endif
217                 map_destroy(mymtd);
218         }
219         if (scx200_docflash_map.virt) {
220                 iounmap(scx200_docflash_map.virt);
221                 release_resource(&docmem);
222         }
223 }
224
225 module_init(init_scx200_docflash);
226 module_exit(cleanup_scx200_docflash);
227
228 /*
229     Local variables:
230         compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
231         c-basic-offset: 8
232     End:
233 */