2 * PISMO memory driver - http://www.pismoworld.org/
4 * For ARM Realview and Versatile platforms
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.
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/i2c.h>
13 #include <linux/platform_device.h>
14 #include <linux/spinlock.h>
15 #include <linux/mutex.h>
16 #include <linux/mtd/physmap.h>
17 #include <linux/mtd/plat-ram.h>
18 #include <linux/mtd/pismo.h>
20 #define PISMO_NUM_CS 5
22 struct pismo_cs_block {
32 struct pismo_cs_block cs[PISMO_NUM_CS];
46 struct i2c_client *client;
47 void (*vpp)(void *, int);
49 struct platform_device *dev[PISMO_NUM_CS];
52 /* FIXME: set_vpp could do with a better calling convention */
53 static struct pismo_data *vpp_pismo;
54 static DEFINE_MUTEX(pismo_mutex);
56 static int pismo_setvpp_probe_fix(struct pismo_data *pismo)
58 mutex_lock(&pismo_mutex);
60 mutex_unlock(&pismo_mutex);
65 mutex_unlock(&pismo_mutex);
69 static void pismo_setvpp_remove_fix(struct pismo_data *pismo)
71 mutex_lock(&pismo_mutex);
72 if (vpp_pismo == pismo)
74 mutex_unlock(&pismo_mutex);
77 static void pismo_set_vpp(struct map_info *map, int on)
79 struct pismo_data *pismo = vpp_pismo;
81 pismo->vpp(pismo->vpp_data, on);
86 static unsigned int __devinit pismo_width_to_bytes(unsigned int width)
94 static int __devinit pismo_eeprom_read(struct i2c_client *client, void *buf,
98 struct i2c_msg msg[] = {
100 .addr = client->addr,
104 .addr = client->addr,
111 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
113 return ret == ARRAY_SIZE(msg) ? size : -EIO;
116 static int __devinit pismo_add_device(struct pismo_data *pismo, int i,
117 struct pismo_mem *region, const char *name, void *pdata, size_t psize)
119 struct platform_device *dev;
120 struct resource res = { };
121 phys_addr_t base = region.base;
128 res.end = base + region->size - 1;
129 res.flags = IORESOURCE_MEM;
131 dev = platform_device_alloc(name, i);
134 dev->dev.parent = &pismo->client->dev;
137 ret = platform_device_add_resources(dev, &res, 1);
141 ret = platform_device_add_data(dev, pdata, psize);
145 ret = platform_device_add(dev);
153 platform_device_put(dev);
157 static int __devinit pismo_add_nor(struct pismo_data *pismo, int i,
158 struct pismo_mem *region)
160 struct physmap_flash_data data = {
161 .width = region->width,
165 data.set_vpp = pismo_set_vpp;
167 return pismo_add_device(pismo, i, region, "physmap-flash",
168 &data, sizeof(data));
171 static int __devinit pismo_add_sram(struct pismo_data *pismo, int i,
172 struct pismo_mem *region)
174 struct platdata_mtd_ram data = {
175 .bankwidth = region->width,
178 return pismo_add_device(pismo, i, region, "mtd-ram",
179 &data, sizeof(data));
182 static void __devinit pismo_add_one(struct pismo_data *pismo, int i,
183 const struct pismo_cs_block *cs, phys_addr_t base)
185 struct device *dev = &pismo->client->dev;
186 struct pismo_mem region;
189 region.type = cs->type;
190 region.width = pismo_width_to_bytes(cs->width);
191 region.access = le16_to_cpu(cs->access);
192 region.size = le32_to_cpu(cs->size);
194 if (region.width == 0) {
195 dev_err(dev, "cs%u: bad width: %02x, ignoring\n", i, cs->width);
200 * FIXME: may need to the platforms memory controller here, but at
201 * the moment we assume that it has already been correctly setup.
202 * The memory controller can also tell us the base address as well.
205 dev_info(dev, "cs%u: %.32s: type %02x access %u00ps size %uK\n",
206 i, cs->device, region.type, region.access, region.size / 1024);
208 switch (region.type) {
216 pismo_add_nor(pismo, i, ®ion);
220 pismo_add_sram(pismo, i, ®ion);
225 static int __devexit pismo_remove(struct i2c_client *client)
227 struct pismo_data *pismo = i2c_get_clientdata(client);
230 for (i = 0; i < ARRAY_SIZE(pismo->dev); i++)
231 platform_device_unregister(pismo->dev[i]);
233 /* FIXME: set_vpp needs saner arguments */
234 pismo_setvpp_remove_fix(pismo);
236 i2c_set_clientdata(client, NULL);
242 static int __devinit pismo_probe(struct i2c_client *client,
243 const struct i2c_device_id *id)
245 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
246 struct pismo_pdata *pdata = client->dev.platform_data;
247 struct pismo_eeprom eeprom;
248 struct pismo_data *pismo;
251 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
252 dev_err(&client->dev, "functionality mismatch\n");
256 pismo = kzalloc(sizeof(*pismo), GFP_KERNEL);
260 /* FIXME: set_vpp needs saner arguments */
261 ret = pismo_setvpp_probe_fix(pismo);
265 pismo->client = client;
267 pismo->vpp = pdata->set_vpp;
268 pismo->vpp_data = pdata->vpp_data;
270 i2c_set_clientdata(client, pismo);
272 ret = pismo_eeprom_read(client, &eeprom, 0, sizeof(eeprom));
274 dev_err(&client->dev, "error reading EEPROM: %d\n", ret);
278 dev_info(&client->dev, "%.15s board found\n", eeprom.board);
280 for (i = 0; i < ARRAY_SIZE(eeprom.cs); i++)
281 if (eeprom.cs[i].type != 0xff)
282 pismo_add_one(pismo, i, &eeprom.cs[i],
288 i2c_set_clientdata(client, NULL);
293 static const struct i2c_device_id pismo_id[] = {
297 MODULE_DEVICE_TABLE(i2c, pismo_id);
299 static struct i2c_driver pismo_driver = {
302 .owner = THIS_MODULE,
304 .probe = pismo_probe,
305 .remove = __devexit_p(pismo_remove),
306 .id_table = pismo_id,
309 static int __init pismo_init(void)
311 BUILD_BUG_ON(sizeof(struct pismo_cs_block) != 48);
312 BUILD_BUG_ON(sizeof(struct pismo_eeprom) != 256);
314 return i2c_add_driver(&pismo_driver);
316 module_init(pismo_init);
318 static void __exit pismo_exit(void)
320 i2c_del_driver(&pismo_driver);
322 module_exit(pismo_exit);
324 MODULE_AUTHOR("Russell King <linux@arm.linux.org.uk>");
325 MODULE_DESCRIPTION("PISMO memory driver");
326 MODULE_LICENSE("GPL");