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/*
* Copyright 2015 Toradex AG
*
* Author: Sanchayan Maity <sanchayan.maity@toradex.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
*/
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#define DRIVER_NAME "vf610-soc-bus"
#define MSCM_CPxCOUNT_OFFSET 0x0000002C
#define MSCM_CPxCFG1_OFFSET 0x00000014
static struct soc_device_attribute *soc_dev_attr;
static struct soc_device *soc_dev;
static int vf610_soc_probe(struct platform_device *pdev)
{
struct regmap *ocotp_regmap, *mscm_regmap, *rom_regmap;
struct device *dev = &pdev->dev;
struct device_node *node = pdev->dev.of_node;
struct device_node *soc_node;
struct of_phandle_args pargs;
char soc_type[] = "xx0";
u32 cfg0_offset, cfg1_offset, rom_rev_offset;
u32 soc_id1, soc_id2, rom_rev;
u32 cpxcount, cpxcfg1;
u64 soc_id;
int ret;
mscm_regmap = syscon_node_to_regmap(node);
if (IS_ERR(mscm_regmap)) {
dev_err(dev, "regmap lookup for mscm failed\n");
return PTR_ERR(mscm_regmap);
}
soc_node = of_find_node_by_path("/soc");
ret = of_parse_phandle_with_fixed_args(soc_node,
"ocotp-cfg", 2, 0, &pargs);
if (ret) {
dev_err(dev, "lookup failed for ocotp-cfg node %d\n", ret);
return ret;
}
ocotp_regmap = syscon_node_to_regmap(pargs.np);
if (IS_ERR(ocotp_regmap)) {
of_node_put(pargs.np);
dev_err(dev, "regmap lookup for ocotp failed\n");
return PTR_ERR(ocotp_regmap);
}
cfg0_offset = pargs.args[0];
cfg1_offset = pargs.args[1];
of_node_put(pargs.np);
ret = of_parse_phandle_with_fixed_args(soc_node,
"rom-revision", 1, 0, &pargs);
if (ret) {
dev_err(dev, "lookup failed for rom-revision node %d\n", ret);
return ret;
}
rom_regmap = syscon_node_to_regmap(pargs.np);
if (IS_ERR(rom_regmap)) {
of_node_put(pargs.np);
dev_err(dev, "regmap lookup for ocrom failed\n");
return PTR_ERR(rom_regmap);
}
rom_rev_offset = pargs.args[0];
of_node_put(pargs.np);
ret = regmap_read(ocotp_regmap, cfg0_offset, &soc_id1);
if (ret)
return -ENODEV;
ret = regmap_read(ocotp_regmap, cfg1_offset, &soc_id2);
if (ret)
return -ENODEV;
soc_id = (u64) soc_id1 << 32 | soc_id2;
add_device_randomness(&soc_id, sizeof(soc_id));
ret = regmap_read(mscm_regmap, MSCM_CPxCOUNT_OFFSET, &cpxcount);
if (ret)
return -ENODEV;
ret = regmap_read(mscm_regmap, MSCM_CPxCFG1_OFFSET, &cpxcfg1);
if (ret)
return -ENODEV;
soc_type[0] = cpxcount ? '6' : '5'; /* Dual Core => VF6x0 */
soc_type[1] = cpxcfg1 ? '1' : '0'; /* L2 Cache => VFx10 */
ret = regmap_read(rom_regmap, rom_rev_offset, &rom_rev);
if (ret)
return -ENODEV;
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return -ENOMEM;
soc_dev_attr->machine = kasprintf(GFP_KERNEL, "Freescale Vybrid");
soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%016llx", soc_id);
soc_dev_attr->family = kasprintf(GFP_KERNEL, "Freescale Vybrid VF%s",
soc_type);
soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%08x", rom_rev);
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
kfree(soc_dev_attr->revision);
kfree(soc_dev_attr->family);
kfree(soc_dev_attr->soc_id);
kfree(soc_dev_attr->machine);
kfree(soc_dev_attr);
return -ENODEV;
}
return 0;
}
static int vf610_soc_remove(struct platform_device *pdev)
{
if (soc_dev_attr) {
kfree(soc_dev_attr->revision);
kfree(soc_dev_attr->family);
kfree(soc_dev_attr->soc_id);
kfree(soc_dev_attr->machine);
kfree(soc_dev_attr);
}
if (soc_dev)
soc_device_unregister(soc_dev);
return 0;
}
static const struct of_device_id vf610_soc_bus_match[] = {
{ .compatible = "fsl,vf610-mscm-cpucfg", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, vf610_soc_bus_match);
static struct platform_driver vf610_soc_driver = {
.probe = vf610_soc_probe,
.remove = vf610_soc_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = vf610_soc_bus_match,
},
};
module_platform_driver(vf610_soc_driver);
MODULE_DESCRIPTION("Freescale VF610 SoC bus driver");
MODULE_LICENSE("GPL v2");
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