1 // SPDX-License-Identifier: GPL-2.0-only
2 /* linux/drivers/mtd/maps/scx200_docflash.c
3
4 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
5
6 National Semiconductor SCx200 flash mapped with DOCCS
7 */
8
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <asm/io.h>
14 #include <linux/mtd/mtd.h>
15 #include <linux/mtd/map.h>
16 #include <linux/mtd/partitions.h>
17
18 #include <linux/pci.h>
19 #include <linux/scx200.h>
20
21 #define NAME "scx200_docflash"
22
23 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
24 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
25 MODULE_LICENSE("GPL");
26
27 static int probe = 0; /* Don't autoprobe */
28 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
29 static unsigned width = 8; /* Default to 8 bits wide */
30 static char *flashtype = "cfi_probe";
31
32 module_param(probe, int, 0);
33 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
34 module_param(size, int, 0);
35 MODULE_PARM_DESC(size, "Size of the flash mapping");
36 module_param(width, int, 0);
37 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
38 module_param(flashtype, charp, 0);
39 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
40
41 static struct resource docmem = {
42 .flags = IORESOURCE_MEM,
43 .name = "NatSemi SCx200 DOCCS Flash",
44 };
45
46 static struct mtd_info *mymtd;
47
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
72 static struct map_info scx200_docflash_map = {
73 .name = "NatSemi SCx200 DOCCS Flash",
74 };
75
init_scx200_docflash(void)76 static int __init init_scx200_docflash(void)
77 {
78 unsigned u;
79 unsigned base;
80 unsigned ctrl;
81 unsigned pmr;
82 struct pci_dev *bridge;
83
84 printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
85
86 if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
87 PCI_DEVICE_ID_NS_SCx200_BRIDGE,
88 NULL)) == NULL)
89 return -ENODEV;
90
91 /* check that we have found the configuration block */
92 if (!scx200_cb_present()) {
93 pci_dev_put(bridge);
94 return -ENODEV;
95 }
96
97 if (probe) {
98 /* Try to use the present flash mapping if any */
99 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
100 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
101 pci_dev_put(bridge);
102
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 pci_dev_put(bridge);
131 for (u = size; u > 1; u >>= 1)
132 ;
133 if (u != 1) {
134 printk(KERN_ERR NAME ": invalid size for flash mapping\n");
135 return -EINVAL;
136 }
137
138 if (width != 8 && width != 16) {
139 printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
140 return -EINVAL;
141 }
142
143 if (allocate_resource(&iomem_resource, &docmem,
144 size,
145 0xc0000000, 0xffffffff,
146 size, NULL, NULL)) {
147 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
148 return -ENOMEM;
149 }
150
151 ctrl = 0x07000000 | ((size-1) >> 13);
152
153 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
154
155 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
156 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
157 pmr = inl(scx200_cb_base + SCx200_PMR);
158
159 if (width == 8) {
160 pmr &= ~(1<<6);
161 } else {
162 pmr |= (1<<6);
163 }
164 outl(pmr, scx200_cb_base + SCx200_PMR);
165 }
166
167 printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n",
168 &docmem, 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 partition_info[3].offset = mymtd->size-partition_info[3].size;
200 partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
201 mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
202
203 return 0;
204 }
205
cleanup_scx200_docflash(void)206 static void __exit cleanup_scx200_docflash(void)
207 {
208 if (mymtd) {
209 mtd_device_unregister(mymtd);
210 map_destroy(mymtd);
211 }
212 if (scx200_docflash_map.virt) {
213 iounmap(scx200_docflash_map.virt);
214 release_resource(&docmem);
215 }
216 }
217
218 module_init(init_scx200_docflash);
219 module_exit(cleanup_scx200_docflash);
220