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 */
237
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