/* * PISMO memory driver - http://www.pismoworld.org/ * * For ARM Realview and Versatile platforms * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License. */ #include #include #include #include #include #include #include #include #include #include #define PISMO_NUM_CS 5 struct pismo_cs_block { u8 type; u8 width; __le16 access; __le32 size; u32 reserved[2]; char device[32]; } __packed; struct pismo_eeprom { struct pismo_cs_block cs[PISMO_NUM_CS]; char board[15]; u8 sum; } __packed; struct pismo_mem { phys_addr_t base; u32 size; u16 access; u8 width; u8 type; }; struct pismo_data { struct i2c_client *client; void (*vpp)(void *, int); void *vpp_data; struct platform_device *dev[PISMO_NUM_CS]; }; static void pismo_set_vpp(struct platform_device *pdev, int on) { struct i2c_client *client = to_i2c_client(pdev->dev.parent); struct pismo_data *pismo = i2c_get_clientdata(client); pismo->vpp(pismo->vpp_data, on); } static unsigned int __devinit pismo_width_to_bytes(unsigned int width) { width &= 15; if (width > 2) return 0; return 1 << width; } static int __devinit pismo_eeprom_read(struct i2c_client *client, void *buf, u8 addr, size_t size) { int ret; struct i2c_msg msg[] = { { .addr = client->addr, .len = sizeof(addr), .buf = &addr, }, { .addr = client->addr, .flags = I2C_M_RD, .len = size, .buf = buf, }, }; ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); return ret == ARRAY_SIZE(msg) ? size : -EIO; } static int __devinit pismo_add_device(struct pismo_data *pismo, int i, struct pismo_mem *region, const char *name, void *pdata, size_t psize) { struct platform_device *dev; struct resource res = { }; phys_addr_t base = region->base; int ret; if (base == ~0) return -ENXIO; res.start = base; res.end = base + region->size - 1; res.flags = IORESOURCE_MEM; dev = platform_device_alloc(name, i); if (!dev) return -ENOMEM; dev->dev.parent = &pismo->client->dev; do { ret = platform_device_add_resources(dev, &res, 1); if (ret) break; ret = platform_device_add_data(dev, pdata, psize); if (ret) break; ret = platform_device_add(dev); if (ret) break; pismo->dev[i] = dev; return 0; } while (0); platform_device_put(dev); return ret; } static int __devinit pismo_add_nor(struct pismo_data *pismo, int i, struct pismo_mem *region) { struct physmap_flash_data data = { .width = region->width, }; if (pismo->vpp) data.set_vpp = pismo_set_vpp; return pismo_add_device(pismo, i, region, "physmap-flash", &data, sizeof(data)); } static int __devinit pismo_add_sram(struct pismo_data *pismo, int i, struct pismo_mem *region) { struct platdata_mtd_ram data = { .bankwidth = region->width, }; return pismo_add_device(pismo, i, region, "mtd-ram", &data, sizeof(data)); } static void __devinit pismo_add_one(struct pismo_data *pismo, int i, const struct pismo_cs_block *cs, phys_addr_t base) { struct device *dev = &pismo->client->dev; struct pismo_mem region; region.base = base; region.type = cs->type; region.width = pismo_width_to_bytes(cs->width); region.access = le16_to_cpu(cs->access); region.size = le32_to_cpu(cs->size); if (region.width == 0) { dev_err(dev, "cs%u: bad width: %02x, ignoring\n", i, cs->width); return; } /* * FIXME: may need to the platforms memory controller here, but at * the moment we assume that it has already been correctly setup. * The memory controller can also tell us the base address as well. */ dev_info(dev, "cs%u: %.32s: type %02x access %u00ps size %uK\n", i, cs->device, region.type, region.access, region.size / 1024); switch (region.type) { case 0: break; case 1: /* static DOC */ break; case 2: /* static NOR */ pismo_add_nor(pismo, i, ®ion); break; case 3: /* static RAM */ pismo_add_sram(pismo, i, ®ion); break; } } static int __devexit pismo_remove(struct i2c_client *client) { struct pismo_data *pismo = i2c_get_clientdata(client); int i; for (i = 0; i < ARRAY_SIZE(pismo->dev); i++) platform_device_unregister(pismo->dev[i]); kfree(pismo); return 0; } static int __devinit pismo_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); struct pismo_pdata *pdata = client->dev.platform_data; struct pismo_eeprom eeprom; struct pismo_data *pismo; int ret, i; if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "functionality mismatch\n"); return -EIO; } pismo = kzalloc(sizeof(*pismo), GFP_KERNEL); if (!pismo) return -ENOMEM; pismo->client = client; if (pdata) { pismo->vpp = pdata->set_vpp; pismo->vpp_data = pdata->vpp_data; } i2c_set_clientdata(client, pismo); ret = pismo_eeprom_read(client, &eeprom, 0, sizeof(eeprom)); if (ret < 0) { dev_err(&client->dev, "error reading EEPROM: %d\n", ret); goto exit_free; } dev_info(&client->dev, "%.15s board found\n", eeprom.board); for (i = 0; i < ARRAY_SIZE(eeprom.cs); i++) if (eeprom.cs[i].type != 0xff) pismo_add_one(pismo, i, &eeprom.cs[i], pdata->cs_addrs[i]); return 0; exit_free: kfree(pismo); return ret; } static const struct i2c_device_id pismo_id[] = { { "pismo" }, { }, }; MODULE_DEVICE_TABLE(i2c, pismo_id); static struct i2c_driver pismo_driver = { .driver = { .name = "pismo", .owner = THIS_MODULE, }, .probe = pismo_probe, .remove = pismo_remove, .id_table = pismo_id, }; static int __init pismo_init(void) { BUILD_BUG_ON(sizeof(struct pismo_cs_block) != 48); BUILD_BUG_ON(sizeof(struct pismo_eeprom) != 256); return i2c_add_driver(&pismo_driver); } module_init(pismo_init); static void __exit pismo_exit(void) { i2c_del_driver(&pismo_driver); } module_exit(pismo_exit); MODULE_AUTHOR("Russell King "); MODULE_DESCRIPTION("PISMO memory driver"); MODULE_LICENSE("GPL");