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/*
* Freescale QIXIS system controller driver.
*
* Copyright 2015 Freescale Semiconductor, Inc.
*
* 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, or (at your option) any later version.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fsl/qixis_ctrl.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#ifdef CONFIG_PPC
#include <asm/machdep.h>
#endif
static struct regmap *qixis_regmap;
/* QIXIS Power Management Control*/
#define QIXIS_PWR_CTL2_PWR 0x80
static void fsl_qixis_power_off(void)
{
u32 val;
local_irq_disable();
regmap_read(qixis_regmap, offsetof(struct fsl_qixis_regs, pwr_ctrl2),
&val);
val |= QIXIS_PWR_CTL2_PWR;
regmap_write(qixis_regmap, offsetof(struct fsl_qixis_regs, pwr_ctrl2),
val);
while (1)
;
}
static void fsl_qixis_pm_init(void)
{
#if defined(CONFIG_PPC)
ppc_md.power_off = fsl_qixis_power_off;
ppc_md.halt = fsl_qixis_power_off;
#elif defined(CONFIG_ARM)
pm_power_off = fsl_qixis_power_off;
#endif
}
static void fsl_qixis_pm_release(void)
{
#if defined(CONFIG_PPC)
ppc_md.power_off = NULL;
ppc_md.halt = NULL;
#elif defined(CONFIG_ARM)
pm_power_off = NULL;
#endif
}
static struct regmap_config qixis_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static int fsl_qixis_probe(struct platform_device *pdev)
{
static struct fsl_qixis_regs __iomem *qixis;
struct resource *res;
u32 qver;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
qixis = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(qixis)) {
pr_err("%s: Could not map qixis registers\n", __func__);
return PTR_ERR(qixis);
}
qixis_regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, qixis,
&qixis_regmap_config);
fsl_qixis_pm_init();
regmap_read(qixis_regmap, offsetof(struct fsl_qixis_regs, qixis_ver),
&qver);
pr_info("Freescale QIXIS Version: 0x%08x\n", qver);
return 0;
}
static int fsl_qixis_remove(struct platform_device *pdev)
{
fsl_qixis_pm_release();
return 0;
}
static const struct of_device_id fsl_qixis_table[] = {
{ .compatible = "fsl,fpga-qixis", },
{ .compatible = "fsl,ls1021aqds-fpga", },
{},
};
static struct platform_driver fsl_qixis_driver = {
.driver = {
.name = "fsl-qixis",
.owner = THIS_MODULE,
.of_match_table = fsl_qixis_table,
},
.probe = fsl_qixis_probe,
.remove = fsl_qixis_remove,
};
module_platform_driver(fsl_qixis_driver);
static int fsl_qixis_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
u32 qver;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EOPNOTSUPP;
qixis_regmap = regmap_init_i2c(client, &qixis_regmap_config);
fsl_qixis_pm_init();
regmap_read(qixis_regmap, offsetof(struct fsl_qixis_regs, qixis_ver),
&qver);
pr_info("Freescale QIXIS Version: 0x%08x\n", qver);
return 0;
}
static int fsl_qixis_i2c_remove(struct i2c_client *client)
{
fsl_qixis_pm_release();
return 0;
}
static const struct i2c_device_id fsl_qixis_id[] = {
{ "fpga-qixis-i2c", 0 },
{ "bsc9132qds-fpga", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, fsl_qixis_id);
static struct i2c_driver fsl_qixis_i2c_driver = {
.driver = {
.name = "fpga-qixis-i2c",
.owner = THIS_MODULE,
},
.probe = fsl_qixis_i2c_probe,
.remove = fsl_qixis_i2c_remove,
.id_table = fsl_qixis_id,
};
module_i2c_driver(fsl_qixis_i2c_driver);
MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");
MODULE_DESCRIPTION("Freescale QIXIS system controller driver");
MODULE_LICENSE("GPL v2");
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