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