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f6a8c609 RKAL |
1 | /* |
2 | * PISMO memory driver - http://www.pismoworld.org/ | |
3 | * | |
4 | * For ARM Realview and Versatile platforms | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License. | |
9 | */ | |
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/i2c.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
f6a8c609 RKAL |
14 | #include <linux/platform_device.h> |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/mtd/physmap.h> | |
18 | #include <linux/mtd/plat-ram.h> | |
19 | #include <linux/mtd/pismo.h> | |
20 | ||
21 | #define PISMO_NUM_CS 5 | |
22 | ||
23 | struct pismo_cs_block { | |
24 | u8 type; | |
25 | u8 width; | |
26 | __le16 access; | |
27 | __le32 size; | |
28 | u32 reserved[2]; | |
29 | char device[32]; | |
30 | } __packed; | |
31 | ||
32 | struct pismo_eeprom { | |
33 | struct pismo_cs_block cs[PISMO_NUM_CS]; | |
34 | char board[15]; | |
35 | u8 sum; | |
36 | } __packed; | |
37 | ||
38 | struct pismo_mem { | |
39 | phys_addr_t base; | |
40 | u32 size; | |
41 | u16 access; | |
42 | u8 width; | |
43 | u8 type; | |
44 | }; | |
45 | ||
46 | struct pismo_data { | |
47 | struct i2c_client *client; | |
48 | void (*vpp)(void *, int); | |
49 | void *vpp_data; | |
50 | struct platform_device *dev[PISMO_NUM_CS]; | |
51 | }; | |
52 | ||
667f390b | 53 | static void pismo_set_vpp(struct platform_device *pdev, int on) |
f6a8c609 | 54 | { |
667f390b MZ |
55 | struct i2c_client *client = to_i2c_client(pdev->dev.parent); |
56 | struct pismo_data *pismo = i2c_get_clientdata(client); | |
f6a8c609 RKAL |
57 | |
58 | pismo->vpp(pismo->vpp_data, on); | |
59 | } | |
f6a8c609 | 60 | |
06f25510 | 61 | static unsigned int pismo_width_to_bytes(unsigned int width) |
f6a8c609 RKAL |
62 | { |
63 | width &= 15; | |
64 | if (width > 2) | |
65 | return 0; | |
66 | return 1 << width; | |
67 | } | |
68 | ||
d8929942 GKH |
69 | static int pismo_eeprom_read(struct i2c_client *client, void *buf, u8 addr, |
70 | size_t size) | |
f6a8c609 RKAL |
71 | { |
72 | int ret; | |
73 | struct i2c_msg msg[] = { | |
74 | { | |
75 | .addr = client->addr, | |
76 | .len = sizeof(addr), | |
77 | .buf = &addr, | |
78 | }, { | |
79 | .addr = client->addr, | |
80 | .flags = I2C_M_RD, | |
81 | .len = size, | |
82 | .buf = buf, | |
83 | }, | |
84 | }; | |
85 | ||
86 | ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); | |
87 | ||
88 | return ret == ARRAY_SIZE(msg) ? size : -EIO; | |
89 | } | |
90 | ||
06f25510 | 91 | static int pismo_add_device(struct pismo_data *pismo, int i, |
d8929942 GKH |
92 | struct pismo_mem *region, const char *name, |
93 | void *pdata, size_t psize) | |
f6a8c609 RKAL |
94 | { |
95 | struct platform_device *dev; | |
96 | struct resource res = { }; | |
1d40ddd1 | 97 | phys_addr_t base = region->base; |
f6a8c609 RKAL |
98 | int ret; |
99 | ||
100 | if (base == ~0) | |
101 | return -ENXIO; | |
102 | ||
103 | res.start = base; | |
104 | res.end = base + region->size - 1; | |
105 | res.flags = IORESOURCE_MEM; | |
106 | ||
107 | dev = platform_device_alloc(name, i); | |
108 | if (!dev) | |
109 | return -ENOMEM; | |
110 | dev->dev.parent = &pismo->client->dev; | |
111 | ||
112 | do { | |
113 | ret = platform_device_add_resources(dev, &res, 1); | |
114 | if (ret) | |
115 | break; | |
116 | ||
117 | ret = platform_device_add_data(dev, pdata, psize); | |
118 | if (ret) | |
119 | break; | |
120 | ||
121 | ret = platform_device_add(dev); | |
122 | if (ret) | |
123 | break; | |
124 | ||
125 | pismo->dev[i] = dev; | |
126 | return 0; | |
127 | } while (0); | |
128 | ||
129 | platform_device_put(dev); | |
130 | return ret; | |
131 | } | |
132 | ||
06f25510 | 133 | static int pismo_add_nor(struct pismo_data *pismo, int i, |
d8929942 | 134 | struct pismo_mem *region) |
f6a8c609 RKAL |
135 | { |
136 | struct physmap_flash_data data = { | |
137 | .width = region->width, | |
138 | }; | |
139 | ||
140 | if (pismo->vpp) | |
141 | data.set_vpp = pismo_set_vpp; | |
142 | ||
143 | return pismo_add_device(pismo, i, region, "physmap-flash", | |
144 | &data, sizeof(data)); | |
145 | } | |
146 | ||
06f25510 | 147 | static int pismo_add_sram(struct pismo_data *pismo, int i, |
d8929942 | 148 | struct pismo_mem *region) |
f6a8c609 RKAL |
149 | { |
150 | struct platdata_mtd_ram data = { | |
151 | .bankwidth = region->width, | |
152 | }; | |
153 | ||
154 | return pismo_add_device(pismo, i, region, "mtd-ram", | |
155 | &data, sizeof(data)); | |
156 | } | |
157 | ||
06f25510 | 158 | static void pismo_add_one(struct pismo_data *pismo, int i, |
d8929942 | 159 | const struct pismo_cs_block *cs, phys_addr_t base) |
f6a8c609 RKAL |
160 | { |
161 | struct device *dev = &pismo->client->dev; | |
162 | struct pismo_mem region; | |
163 | ||
164 | region.base = base; | |
165 | region.type = cs->type; | |
166 | region.width = pismo_width_to_bytes(cs->width); | |
167 | region.access = le16_to_cpu(cs->access); | |
168 | region.size = le32_to_cpu(cs->size); | |
169 | ||
170 | if (region.width == 0) { | |
171 | dev_err(dev, "cs%u: bad width: %02x, ignoring\n", i, cs->width); | |
172 | return; | |
173 | } | |
174 | ||
175 | /* | |
176 | * FIXME: may need to the platforms memory controller here, but at | |
177 | * the moment we assume that it has already been correctly setup. | |
178 | * The memory controller can also tell us the base address as well. | |
179 | */ | |
180 | ||
181 | dev_info(dev, "cs%u: %.32s: type %02x access %u00ps size %uK\n", | |
182 | i, cs->device, region.type, region.access, region.size / 1024); | |
183 | ||
184 | switch (region.type) { | |
185 | case 0: | |
186 | break; | |
187 | case 1: | |
188 | /* static DOC */ | |
189 | break; | |
190 | case 2: | |
191 | /* static NOR */ | |
192 | pismo_add_nor(pismo, i, ®ion); | |
193 | break; | |
194 | case 3: | |
195 | /* static RAM */ | |
196 | pismo_add_sram(pismo, i, ®ion); | |
197 | break; | |
198 | } | |
199 | } | |
200 | ||
810b7e06 | 201 | static int pismo_remove(struct i2c_client *client) |
f6a8c609 RKAL |
202 | { |
203 | struct pismo_data *pismo = i2c_get_clientdata(client); | |
204 | int i; | |
205 | ||
206 | for (i = 0; i < ARRAY_SIZE(pismo->dev); i++) | |
207 | platform_device_unregister(pismo->dev[i]); | |
208 | ||
f6a8c609 RKAL |
209 | kfree(pismo); |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
06f25510 | 214 | static int pismo_probe(struct i2c_client *client, |
d8929942 | 215 | const struct i2c_device_id *id) |
f6a8c609 RKAL |
216 | { |
217 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
218 | struct pismo_pdata *pdata = client->dev.platform_data; | |
219 | struct pismo_eeprom eeprom; | |
220 | struct pismo_data *pismo; | |
221 | int ret, i; | |
222 | ||
223 | if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) { | |
224 | dev_err(&client->dev, "functionality mismatch\n"); | |
225 | return -EIO; | |
226 | } | |
227 | ||
228 | pismo = kzalloc(sizeof(*pismo), GFP_KERNEL); | |
229 | if (!pismo) | |
230 | return -ENOMEM; | |
231 | ||
f6a8c609 RKAL |
232 | pismo->client = client; |
233 | if (pdata) { | |
234 | pismo->vpp = pdata->set_vpp; | |
235 | pismo->vpp_data = pdata->vpp_data; | |
236 | } | |
237 | i2c_set_clientdata(client, pismo); | |
238 | ||
239 | ret = pismo_eeprom_read(client, &eeprom, 0, sizeof(eeprom)); | |
240 | if (ret < 0) { | |
241 | dev_err(&client->dev, "error reading EEPROM: %d\n", ret); | |
395b2288 | 242 | goto exit_free; |
f6a8c609 RKAL |
243 | } |
244 | ||
245 | dev_info(&client->dev, "%.15s board found\n", eeprom.board); | |
246 | ||
247 | for (i = 0; i < ARRAY_SIZE(eeprom.cs); i++) | |
248 | if (eeprom.cs[i].type != 0xff) | |
249 | pismo_add_one(pismo, i, &eeprom.cs[i], | |
250 | pdata->cs_addrs[i]); | |
251 | ||
252 | return 0; | |
395b2288 WS |
253 | |
254 | exit_free: | |
395b2288 WS |
255 | kfree(pismo); |
256 | return ret; | |
f6a8c609 RKAL |
257 | } |
258 | ||
259 | static const struct i2c_device_id pismo_id[] = { | |
260 | { "pismo" }, | |
261 | { }, | |
262 | }; | |
263 | MODULE_DEVICE_TABLE(i2c, pismo_id); | |
264 | ||
265 | static struct i2c_driver pismo_driver = { | |
266 | .driver = { | |
267 | .name = "pismo", | |
268 | .owner = THIS_MODULE, | |
269 | }, | |
270 | .probe = pismo_probe, | |
5153b88c | 271 | .remove = pismo_remove, |
f6a8c609 RKAL |
272 | .id_table = pismo_id, |
273 | }; | |
274 | ||
275 | static int __init pismo_init(void) | |
276 | { | |
277 | BUILD_BUG_ON(sizeof(struct pismo_cs_block) != 48); | |
278 | BUILD_BUG_ON(sizeof(struct pismo_eeprom) != 256); | |
279 | ||
280 | return i2c_add_driver(&pismo_driver); | |
281 | } | |
282 | module_init(pismo_init); | |
283 | ||
284 | static void __exit pismo_exit(void) | |
285 | { | |
286 | i2c_del_driver(&pismo_driver); | |
287 | } | |
288 | module_exit(pismo_exit); | |
289 | ||
290 | MODULE_AUTHOR("Russell King <linux@arm.linux.org.uk>"); | |
291 | MODULE_DESCRIPTION("PISMO memory driver"); | |
292 | MODULE_LICENSE("GPL"); |