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Thomas Gleixner69f34c92005-11-07 11:15:40 +00001/* linux/drivers/mtd/maps/scx200_docflash.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07002
3 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
4
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 National Semiconductor SCx200 flash mapped with DOCCS
6*/
7
8#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#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; /* Don't autoprobe */
27static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
28static unsigned width = 8; /* Default to 8 bits wide */
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070047static struct mtd_partition partition_info[] = {
Thomas Gleixner69f34c92005-11-07 11:15:40 +000048 {
49 .name = "DOCCS Boot kernel",
50 .offset = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 .size = 0xc0000
52 },
Thomas Gleixner69f34c92005-11-07 11:15:40 +000053 {
54 .name = "DOCCS Low BIOS",
55 .offset = 0xc0000,
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 .size = 0x40000
57 },
Thomas Gleixner69f34c92005-11-07 11:15:40 +000058 {
59 .name = "DOCCS File system",
60 .offset = 0x100000,
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 .size = ~0 /* calculate from flash size */
62 },
Thomas Gleixner69f34c92005-11-07 11:15:40 +000063 {
64 .name = "DOCCS High BIOS",
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 .offset = ~0, /* calculate from flash size */
66 .size = 0x80000
67 },
68};
Tobias Klauser87d10f32006-03-31 02:29:45 -080069#define NUM_PARTITIONS ARRAY_SIZE(partition_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71static struct map_info scx200_docflash_map = {
72 .name = "NatSemi SCx200 DOCCS Flash",
73};
74
75static 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
Alan Coxdd8e9ed2006-09-22 10:19:20 +010085 if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 PCI_DEVICE_ID_NS_SCx200_BRIDGE,
87 NULL)) == NULL)
88 return -ENODEV;
89
90 /* check that we have found the configuration block */
Alan Coxdd8e9ed2006-09-22 10:19:20 +010091 if (!scx200_cb_present()) {
92 pci_dev_put(bridge);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return -ENODEV;
Alan Coxdd8e9ed2006-09-22 10:19:20 +010094 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
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);
Alan Coxdd8e9ed2006-09-22 10:19:20 +0100100 pci_dev_put(bridge);
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 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 {
Alan Coxdd8e9ed2006-09-22 10:19:20 +0100129 pci_dev_put(bridge);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 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 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (width != 8 && width != 16) {
138 printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
139 return -EINVAL;
140 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000141
142 if (allocate_resource(&iomem_resource, &docmem,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 size,
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000144 0xc0000000, 0xffffffff,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 size, NULL, NULL)) {
146 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
147 return -ENOMEM;
148 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 ctrl = 0x07000000 | ((size-1) >> 13);
151
152 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 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);
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 if (width == 8) {
159 pmr &= ~(1<<6);
160 } else {
161 pmr |= (1<<6);
162 }
163 outl(pmr, scx200_cb_base + SCx200_PMR);
164 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000165
Joe Perchesf9a52792010-11-12 13:37:57 -0800166 printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n",
167 &docmem, width);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 partition_info[3].offset = mymtd->size-partition_info[3].size;
199 partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
Jamie Ilesf6c11c12011-05-23 10:23:10 +0100200 mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return 0;
203}
204
205static void __exit cleanup_scx200_docflash(void)
206{
207 if (mymtd) {
Jamie Ilesf6c11c12011-05-23 10:23:10 +0100208 mtd_device_unregister(mymtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 map_destroy(mymtd);
210 }
211 if (scx200_docflash_map.virt) {
212 iounmap(scx200_docflash_map.virt);
213 release_resource(&docmem);
214 }
215}
216
217module_init(init_scx200_docflash);
218module_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*/