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/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <mach/msm_iomap.h>
#define CLOCK_CONTROL_REG 0x00
#define BUS_SMCBC_REG 0x04
#define PSCBC_BUS_REG 0x0C
#define PSCBC_GENI_REG 0x10
#define STANDBY_MODE 0x2
#define ACTIVE_MODE 0x1
#define ASYNC_SW_CLK_EN 0x2
struct msm_spss_dev_t {
void __iomem *base;
struct clk *clk;
};
static struct msm_spss_dev_t msm_spss_dev;
static int msm_spss_probe(struct platform_device *pdev)
{
struct resource *res;
int rc = 0;
msm_spss_dev.clk = clk_get(&pdev->dev, "iface_clk");
if (IS_ERR(msm_spss_dev.clk)) {
rc = PTR_ERR(msm_spss_dev.clk);
dev_err(&pdev->dev, "could not get ahb clk %d\n", rc);
goto err_clk_get;
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
if (!res) {
dev_err(&pdev->dev, "missing memory resource\n");
rc = -EINVAL;
goto err_res;
}
msm_spss_dev.base = ioremap(res->start, resource_size(res));
if (!msm_spss_dev.base) {
dev_err(&pdev->dev, "ioremap failed\n");
rc = -ENOMEM;
goto err_ioremap;
}
rc = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
if (rc) {
dev_err(&pdev->dev, "of_platform_populate failed %d\n", rc);
goto err_of_plat_pop;
}
rc = clk_prepare_enable(msm_spss_dev.clk);
if (rc) {
dev_err(&pdev->dev, "ahb clk enable failed %d\n", rc);
goto err_clk_en;
}
writel_relaxed(ASYNC_SW_CLK_EN, (msm_spss_dev.base + BUS_SMCBC_REG));
writel_relaxed(ASYNC_SW_CLK_EN, (msm_spss_dev.base + PSCBC_BUS_REG));
writel_relaxed(ASYNC_SW_CLK_EN, (msm_spss_dev.base + PSCBC_GENI_REG));
clk_disable_unprepare(msm_spss_dev.clk);
return 0;
err_clk_en:
err_of_plat_pop:
iounmap(msm_spss_dev.base);
err_ioremap:
err_res:
clk_put(msm_spss_dev.clk);
err_clk_get:
return rc;
}
static int __exit msm_spss_remove(struct platform_device *pdev)
{
if (msm_spss_dev.base)
iounmap(msm_spss_dev.base);
if (msm_spss_dev.clk)
clk_put(msm_spss_dev.clk);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int msm_spss_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
int rc;
u32 val;
rc = clk_prepare_enable(msm_spss_dev.clk);
if (rc) {
dev_err(&pdev->dev, "ahb clk enable failed %d\n", rc);
return rc;
}
val = readl_relaxed(msm_spss_dev.base + CLOCK_CONTROL_REG);
val &= ~ACTIVE_MODE;
val |= STANDBY_MODE;
writel_relaxed(val, (msm_spss_dev.base + CLOCK_CONTROL_REG));
wmb();
clk_disable_unprepare(msm_spss_dev.clk);
return 0;
}
static int msm_spss_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
int rc;
u32 val;
rc = clk_prepare_enable(msm_spss_dev.clk);
if (rc) {
dev_err(&pdev->dev, "ahb clk enable failed %d\n", rc);
return rc;
}
val = readl_relaxed(msm_spss_dev.base + CLOCK_CONTROL_REG);
val &= ~STANDBY_MODE;
val |= ACTIVE_MODE;
writel_relaxed(val, (msm_spss_dev.base + CLOCK_CONTROL_REG));
wmb();
clk_disable_unprepare(msm_spss_dev.clk);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops msm_spss_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(
msm_spss_suspend,
msm_spss_resume
)
};
static struct of_device_id msm_spss_match[] = {
{ .compatible = "qcom,msm-spss",
},
{}
};
static struct platform_driver msm_spss_driver = {
.probe = msm_spss_probe,
.remove = msm_spss_remove,
.driver = {
.name = "msm_spss",
.owner = THIS_MODULE,
.pm = &msm_spss_dev_pm_ops,
.of_match_table = msm_spss_match,
},
};
static int __init spss_init(void)
{
return platform_driver_register(&msm_spss_driver);
}
static void __exit spss_exit(void)
{
platform_driver_unregister(&msm_spss_driver);
}
module_init(spss_init);
module_exit(spss_exit);
MODULE_LICENSE("GPL v2");
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