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/slab.h>
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>
21 #define PISMO_NUM_CS 5
23 struct pismo_cs_block {
33 struct pismo_cs_block cs[PISMO_NUM_CS];
47 struct i2c_client *client;
48 void (*vpp)(void *, int);
50 struct platform_device *dev[PISMO_NUM_CS];
53 static void pismo_set_vpp(struct platform_device *pdev, int on)
55 struct i2c_client *client = to_i2c_client(pdev->dev.parent);
56 struct pismo_data *pismo = i2c_get_clientdata(client);
58 pismo->vpp(pismo->vpp_data, on);
61 static unsigned int __devinit pismo_width_to_bytes(unsigned int width)
69 static int __devinit pismo_eeprom_read(struct i2c_client *client, void *buf,
73 struct i2c_msg msg[] = {
86 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
88 return ret == ARRAY_SIZE(msg) ? size : -EIO;
91 static int __devinit pismo_add_device(struct pismo_data *pismo, int i,
92 struct pismo_mem *region, const char *name, void *pdata, size_t psize)
94 struct platform_device *dev;
95 struct resource res = { };
96 phys_addr_t base = region->base;
103 res.end = base + region->size - 1;
104 res.flags = IORESOURCE_MEM;
106 dev = platform_device_alloc(name, i);
109 dev->dev.parent = &pismo->client->dev;
112 ret = platform_device_add_resources(dev, &res, 1);
116 ret = platform_device_add_data(dev, pdata, psize);
120 ret = platform_device_add(dev);
128 platform_device_put(dev);
132 static int __devinit pismo_add_nor(struct pismo_data *pismo, int i,
133 struct pismo_mem *region)
135 struct physmap_flash_data data = {
136 .width = region->width,
140 data.set_vpp = pismo_set_vpp;
142 return pismo_add_device(pismo, i, region, "physmap-flash",
143 &data, sizeof(data));
146 static int __devinit pismo_add_sram(struct pismo_data *pismo, int i,
147 struct pismo_mem *region)
149 struct platdata_mtd_ram data = {
150 .bankwidth = region->width,
153 return pismo_add_device(pismo, i, region, "mtd-ram",
154 &data, sizeof(data));
157 static void __devinit pismo_add_one(struct pismo_data *pismo, int i,
158 const struct pismo_cs_block *cs, phys_addr_t base)
160 struct device *dev = &pismo->client->dev;
161 struct pismo_mem region;
164 region.type = cs->type;
165 region.width = pismo_width_to_bytes(cs->width);
166 region.access = le16_to_cpu(cs->access);
167 region.size = le32_to_cpu(cs->size);
169 if (region.width == 0) {
170 dev_err(dev, "cs%u: bad width: %02x, ignoring\n", i, cs->width);
175 * FIXME: may need to the platforms memory controller here, but at
176 * the moment we assume that it has already been correctly setup.
177 * The memory controller can also tell us the base address as well.
180 dev_info(dev, "cs%u: %.32s: type %02x access %u00ps size %uK\n",
181 i, cs->device, region.type, region.access, region.size / 1024);
183 switch (region.type) {
191 pismo_add_nor(pismo, i, ®ion);
195 pismo_add_sram(pismo, i, ®ion);
200 static int __devexit pismo_remove(struct i2c_client *client)
202 struct pismo_data *pismo = i2c_get_clientdata(client);
205 for (i = 0; i < ARRAY_SIZE(pismo->dev); i++)
206 platform_device_unregister(pismo->dev[i]);
213 static int __devinit pismo_probe(struct i2c_client *client,
214 const struct i2c_device_id *id)
216 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
217 struct pismo_pdata *pdata = client->dev.platform_data;
218 struct pismo_eeprom eeprom;
219 struct pismo_data *pismo;
222 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
223 dev_err(&client->dev, "functionality mismatch\n");
227 pismo = kzalloc(sizeof(*pismo), GFP_KERNEL);
231 pismo->client = client;
233 pismo->vpp = pdata->set_vpp;
234 pismo->vpp_data = pdata->vpp_data;
236 i2c_set_clientdata(client, pismo);
238 ret = pismo_eeprom_read(client, &eeprom, 0, sizeof(eeprom));
240 dev_err(&client->dev, "error reading EEPROM: %d\n", ret);
244 dev_info(&client->dev, "%.15s board found\n", eeprom.board);
246 for (i = 0; i < ARRAY_SIZE(eeprom.cs); i++)
247 if (eeprom.cs[i].type != 0xff)
248 pismo_add_one(pismo, i, &eeprom.cs[i],
258 static const struct i2c_device_id pismo_id[] = {
262 MODULE_DEVICE_TABLE(i2c, pismo_id);
264 static struct i2c_driver pismo_driver = {
267 .owner = THIS_MODULE,
269 .probe = pismo_probe,
270 .remove = __devexit_p(pismo_remove),
271 .id_table = pismo_id,
274 static int __init pismo_init(void)
276 BUILD_BUG_ON(sizeof(struct pismo_cs_block) != 48);
277 BUILD_BUG_ON(sizeof(struct pismo_eeprom) != 256);
279 return i2c_add_driver(&pismo_driver);
281 module_init(pismo_init);
283 static void __exit pismo_exit(void)
285 i2c_del_driver(&pismo_driver);
287 module_exit(pismo_exit);
289 MODULE_AUTHOR("Russell King <linux@arm.linux.org.uk>");
290 MODULE_DESCRIPTION("PISMO memory driver");
291 MODULE_LICENSE("GPL");