/*
* Copyright (c) 2014 Tomasz Figa <t.figa@samsung.com>
*
* Based on Exynos Audio Subsystem Clock Controller driver:
*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* Author: Padmavathi Venna <padma.v@samsung.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.
*
* Driver for Audio Subsystem Clock Controller of S5PV210-compatible SoCs.
*/
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/of_address.h>
#include <linux/syscore_ops.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <dt-bindings/clock/s5pv210-audss.h>
static DEFINE_SPINLOCK(lock);
static struct clk **clk_table;
static void __iomem *reg_base;
static struct clk_onecell_data clk_data;
#define ASS_CLK_SRC 0x0
#define ASS_CLK_DIV 0x4
#define ASS_CLK_GATE 0x8
#ifdef CONFIG_PM_SLEEP
static unsigned long reg_save[][2] = {
{ASS_CLK_SRC, 0},
{ASS_CLK_DIV, 0},
{ASS_CLK_GATE, 0},
};
static int s5pv210_audss_clk_suspend(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(reg_save); i++)
reg_save[i][1] = readl(reg_base + reg_save[i][0]);
return 0;
}
static void s5pv210_audss_clk_resume(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(reg_save); i++)
writel(reg_save[i][1], reg_base + reg_save[i][0]);
}
static struct syscore_ops s5pv210_audss_clk_syscore_ops = {
.suspend = s5pv210_audss_clk_suspend,
.resume = s5pv210_audss_clk_resume,
};
#endif /* CONFIG_PM_SLEEP */
/* register s5pv210_audss clocks */
static int s5pv210_audss_clk_probe(struct platform_device *pdev)
{
int i, ret = 0;
struct resource *res;
const char *mout_audss_p[2];
const char *mout_i2s_p[3];
const char *hclk_p;
struct clk *hclk, *pll_ref, *pll_in, *cdclk, *sclk_audio;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(reg_base)) {
dev_err(&pdev->dev, "failed to map audss registers\n");
return PTR_ERR(reg_base);
}
clk_table = devm_kzalloc(&pdev->dev,
sizeof(struct clk *) * AUDSS_MAX_CLKS,
GFP_KERNEL);
if (!clk_table)
return -ENOMEM;
clk_data.clks = clk_table;
clk_data.clk_num = AUDSS_MAX_CLKS;
hclk = devm_clk_get(&pdev->dev, "hclk");
if (IS_ERR(hclk)) {
dev_err(&pdev->dev, "failed to get hclk clock\n");
return PTR_ERR(hclk);
}
pll_in = devm_clk_get(&pdev->dev, "fout_epll");
if (IS_ERR(pll_in)) {
dev_err(&pdev->dev, "failed to get fout_epll clock\n");
return PTR_ERR(pll_in);
}
sclk_audio = devm_clk_get(&pdev->dev, "sclk_audio0");
if (IS_ERR(sclk_audio)) {
dev_err(&pdev->dev, "failed to get sclk_audio0 clock\n");
return PTR_ERR(sclk_audio);
}
/* iiscdclk0 is an optional external I2S codec clock */
cdclk = devm_clk_get(&pdev->dev, "iiscdclk0");
pll_ref = devm_clk_get(&pdev->dev, "xxti");
if (!IS_ERR(pll_ref))
mout_audss_p[0] = __clk_get_name(pll_ref);
else
mout_audss_p[0] = "xxti";
mout_audss_p[1] = __clk_get_name(pll_in);
clk_table[CLK_MOUT_AUDSS] = clk_register_mux(NULL, "mout_audss",
mout_audss_p, ARRAY_SIZE(mout_audss_p),
CLK_SET_RATE_NO_REPARENT,
reg_base + ASS_CLK_SRC, 0, 1, 0, &lock);
mout_i2s_p[0] = "mout_audss";
if (!IS_ERR(cdclk))
mout_i2s_p[1] = __clk_get_name(cdclk);
else
mout_i2s_p[1] = "iiscdclk0";
mout_i2s_p[2] = __clk_get_name(sclk_audio);
clk_table[CLK_MOUT_I2S_A] = clk_register_mux(NULL, "mout_i2s_audss",
mout_i2s_p, ARRAY_SIZE(mout_i2s_p),
CLK_SET_RATE_NO_REPARENT,
reg_base + ASS_CLK_SRC, 2, 2, 0, &lock);
clk_table[CLK_DOUT_AUD_BUS] = clk_register_divider(NULL,
"dout_aud_bus", "mout_audss", 0,
reg_base + ASS_CLK_DIV, 0, 4, 0, &lock);
clk_table[CLK_DOUT_I2S_A] = clk_register_divider(NULL, "dout_i2s_audss",
"mout_i2s_audss", 0, reg_base + ASS_CLK_DIV,
4, 4, 0, &lock);
clk_table[CLK_I2S] = clk_register_gate(NULL, "i2s_audss",
"dout_i2s_audss", CLK_SET_RATE_PARENT,
reg_base + ASS_CLK_GATE, 6, 0, &lock);
hclk_p = __clk_get_name(hclk);
clk_table[CLK_HCLK_I2S] = clk_register_gate(NULL, "hclk_i2s_audss",
hclk_p, CLK_IGNORE_UNUSED,
reg_base + ASS_CLK_GATE, 5, 0, &lock);
clk_table[CLK_HCLK_UART] = clk_register_gate(NULL, "hclk_uart_audss",
hclk_p, CLK_IGNORE_UNUSED,
reg_base + ASS_CLK_GATE, 4, 0, &lock);
clk_table[CLK_HCLK_HWA] = clk_register_gate(NULL, "hclk_hwa_audss",
hclk_p, CLK_IGNORE_UNUSED,
reg_base + ASS_CLK_GATE, 3, 0, &lock);
clk_table[CLK_HCLK_DMA] = clk_register_gate(NULL, "hclk_dma_audss",
hclk_p, CLK_IGNORE_UNUSED,
reg_base + ASS_CLK_GATE, 2, 0, &lock);
clk_table[CLK_HCLK_BUF] = clk_register_gate(NULL, "hclk_buf_audss",
hclk_p, CLK_IGNORE_UNUSED,
reg_base + ASS_CLK_GATE, 1, 0, &lock);
clk_table[CLK_HCLK_RP] = clk_register_gate(NULL, "hclk_rp_audss",
hclk_p, CLK_IGNORE_UNUSED,
reg_base + ASS_CLK_GATE, 0, 0, &lock);
for (i = 0; i < clk_data.clk_num; i++) {
if (IS_ERR(clk_table[i])) {
dev_err(&pdev->dev, "failed to register clock %d\n", i);
ret = PTR_ERR(clk_table[i]);
goto unregister;
}
}
ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get,
&clk_data);
if (ret) {
dev_err(&pdev->dev, "failed to add clock provider\n");
goto unregister;
}
#ifdef CONFIG_PM_SLEEP
register_syscore_ops(&s5pv210_audss_clk_syscore_ops);
#endif
return 0;
unregister:
for (i = 0; i < clk_data.clk_num; i++) {
if (!IS_ERR(clk_table[i]))
clk_unregister(clk_table[i]);
}
return ret;
}
static int s5pv210_audss_clk_remove(struct platform_device *pdev)
{
int i;
of_clk_del_provider(pdev->dev.of_node);
for (i = 0; i < clk_data.clk_num; i++) {
if (!IS_ERR(clk_table[i]))
clk_unregister(clk_table[i]);
}
return 0;
}
static const struct of_device_id s5pv210_audss_clk_of_match[] = {
{ .compatible = "samsung,s5pv210-audss-clock", },
{},
};
static struct platform_driver s5pv210_audss_clk_driver = {
.driver = {
.name = "s5pv210-audss-clk",
.of_match_table = s5pv210_audss_clk_of_match,
},
.probe = s5pv210_audss_clk_probe,
.remove = s5pv210_audss_clk_remove,
};
static int __init s5pv210_audss_clk_init(void)
{
return platform_driver_register(&s5pv210_audss_clk_driver);
}
core_initcall(s5pv210_audss_clk_init);
static void __exit s5pv210_audss_clk_exit(void)
{
platform_driver_unregister(&s5pv210_audss_clk_driver);
}
module_exit(s5pv210_audss_clk_exit);
MODULE_AUTHOR("Tomasz Figa <t.figa@samsung.com>");
MODULE_DESCRIPTION("S5PV210 Audio Subsystem Clock Controller");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:s5pv210-audss-clk");
