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 static struct mtd_partition partition_info[] = {
48 {
49 .name = "DOCCS Boot kernel",
50 .offset = 0,
51 .size = 0xc0000
52 },
53 {
54 .name = "DOCCS Low BIOS",
55 .offset = 0xc0000,
56 .size = 0x40000
57 },
58 {
59 .name = "DOCCS File system",
60 .offset = 0x100000,
61 .size = ~0 /* calculate from flash size */
62 },
63 {
64 .name = "DOCCS High BIOS",
65 .offset = ~0, /* calculate from flash size */
66 .size = 0x80000
67 },
68 };
69 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
70
71 static struct map_info scx200_docflash_map = {
72 .name = "NatSemi SCx200 DOCCS Flash",
73 };
74
init_scx200_docflash(void)75 static int __init init_scx200_docflash(void)
76 {
77 unsigned u;
78 unsigned base;
79 unsigned ctrl;
80 unsigned pmr;
81 struct pci_dev *bridge;
82
83 printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
84
85 if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
86 PCI_DEVICE_ID_NS_SCx200_BRIDGE,
87 NULL)) == NULL)
88 return -ENODEV;
89
90 /* check that we have found the configuration block */
91 if (!scx200_cb_present()) {
92 pci_dev_put(bridge);
93 return -ENODEV;
94 }
95
96 if (probe) {
97 /* Try to use the present flash mapping if any */
98 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
99 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
100 pci_dev_put(bridge);
101
102 pmr = inl(scx200_cb_base + SCx200_PMR);
103
104 if (base == 0
105 || (ctrl & 0x07000000) != 0x07000000
106 || (ctrl & 0x0007ffff) == 0)
107 return -ENODEV;
108
109 size = ((ctrl&0x1fff)<<13) + (1<<13);
110
111 for (u = size; u > 1; u >>= 1)
112 ;
113 if (u != 1)
114 return -ENODEV;
115
116 if (pmr & (1<<6))
117 width = 16;
118 else
119 width = 8;
120
121 docmem.start = base;
122 docmem.end = base + size;
123
124 if (request_resource(&iomem_resource, &docmem)) {
125 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
126 return -ENOMEM;
127 }
128 } else {
129 pci_dev_put(bridge);
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 %pR, width %d\n",
167 &docmem, width);
168
169 scx200_docflash_map.size = size;
170 if (width == 8)
171 scx200_docflash_map.bankwidth = 1;
172 else
173 scx200_docflash_map.bankwidth = 2;
174
175 simple_map_init(&scx200_docflash_map);
176
177 scx200_docflash_map.phys = docmem.start;
178 scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
179 if (!scx200_docflash_map.virt) {
180 printk(KERN_ERR NAME ": failed to ioremap the flash\n");
181 release_resource(&docmem);
182 return -EIO;
183 }
184
185 mymtd = do_map_probe(flashtype, &scx200_docflash_map);
186 if (!mymtd) {
187 printk(KERN_ERR NAME ": unable to detect flash\n");
188 iounmap(scx200_docflash_map.virt);
189 release_resource(&docmem);
190 return -ENXIO;
191 }
192
193 if (size < mymtd->size)
194 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
195
196 mymtd->owner = THIS_MODULE;
197
198 partition_info[3].offset = mymtd->size-partition_info[3].size;
199 partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
200 mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
201
202 return 0;
203 }
204
cleanup_scx200_docflash(void)205 static void __exit cleanup_scx200_docflash(void)
206 {
207 if (mymtd) {
208 mtd_device_unregister(mymtd);
209 map_destroy(mymtd);
210 }
211 if (scx200_docflash_map.virt) {
212 iounmap(scx200_docflash_map.virt);
213 release_resource(&docmem);
214 }
215 }
216
217 module_init(init_scx200_docflash);
218 module_exit(cleanup_scx200_docflash);
219
220 /*
221 Local variables:
222 compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
223 c-basic-offset: 8
224 End:
225 */
226
