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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
22MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
23MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
24MODULE_LICENSE("GPL");
25
26static int probe = 0;
27static unsigned size = 0x1000000;
28static unsigned width = 8;
29static char *flashtype = "cfi_probe";
30
31module_param(probe, int, 0);
32MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
33module_param(size, int, 0);
34MODULE_PARM_DESC(size, "Size of the flash mapping");
35module_param(width, int, 0);
36MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
37module_param(flashtype, charp, 0);
38MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
39
40static struct resource docmem = {
41 .flags = IORESOURCE_MEM,
42 .name = "NatSemi SCx200 DOCCS Flash",
43};
44
45static struct mtd_info *mymtd;
46
47#ifdef CONFIG_MTD_PARTITIONS
48static 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
63 },
64 {
65 .name = "DOCCS High BIOS",
66 .offset = ~0,
67 .size = 0x80000
68 },
69};
70#define NUM_PARTITIONS ARRAY_SIZE(partition_info)
71#endif
72
73
74static struct map_info scx200_docflash_map = {
75 .name = "NatSemi SCx200 DOCCS Flash",
76};
77
78static 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
94 if (!scx200_cb_present()) {
95 pci_dev_put(bridge);
96 return -ENODEV;
97 }
98
99 if (probe) {
100
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 %pR, width %d\n",
170 &docmem, width);
171
172 scx200_docflash_map.size = size;
173 if (width == 8)
174 scx200_docflash_map.bankwidth = 1;
175 else
176 scx200_docflash_map.bankwidth = 2;
177
178 simple_map_init(&scx200_docflash_map);
179
180 scx200_docflash_map.phys = docmem.start;
181 scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
182 if (!scx200_docflash_map.virt) {
183 printk(KERN_ERR NAME ": failed to ioremap the flash\n");
184 release_resource(&docmem);
185 return -EIO;
186 }
187
188 mymtd = do_map_probe(flashtype, &scx200_docflash_map);
189 if (!mymtd) {
190 printk(KERN_ERR NAME ": unable to detect flash\n");
191 iounmap(scx200_docflash_map.virt);
192 release_resource(&docmem);
193 return -ENXIO;
194 }
195
196 if (size < mymtd->size)
197 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
198
199 mymtd->owner = THIS_MODULE;
200
201#ifdef CONFIG_MTD_PARTITIONS
202 partition_info[3].offset = mymtd->size-partition_info[3].size;
203 partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
204 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
205#else
206 add_mtd_device(mymtd);
207#endif
208 return 0;
209}
210
211static void __exit cleanup_scx200_docflash(void)
212{
213 if (mymtd) {
214#ifdef CONFIG_MTD_PARTITIONS
215 del_mtd_partitions(mymtd);
216#else
217 del_mtd_device(mymtd);
218#endif
219 map_destroy(mymtd);
220 }
221 if (scx200_docflash_map.virt) {
222 iounmap(scx200_docflash_map.virt);
223 release_resource(&docmem);
224 }
225}
226
227module_init(init_scx200_docflash);
228module_exit(cleanup_scx200_docflash);
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