163 строки
4.3 KiB
C
163 строки
4.3 KiB
C
/*
|
|
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
|
|
* Author: Tomasz Figa <t.figa@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.
|
|
*
|
|
* Clock driver for Exynos clock output
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/syscore_ops.h>
|
|
|
|
#define EXYNOS_CLKOUT_NR_CLKS 1
|
|
#define EXYNOS_CLKOUT_PARENTS 32
|
|
|
|
#define EXYNOS_PMU_DEBUG_REG 0xa00
|
|
#define EXYNOS_CLKOUT_DISABLE_SHIFT 0
|
|
#define EXYNOS_CLKOUT_MUX_SHIFT 8
|
|
#define EXYNOS4_CLKOUT_MUX_MASK 0xf
|
|
#define EXYNOS5_CLKOUT_MUX_MASK 0x1f
|
|
|
|
struct exynos_clkout {
|
|
struct clk_gate gate;
|
|
struct clk_mux mux;
|
|
spinlock_t slock;
|
|
void __iomem *reg;
|
|
u32 pmu_debug_save;
|
|
struct clk_hw_onecell_data data;
|
|
};
|
|
|
|
static struct exynos_clkout *clkout;
|
|
|
|
static int exynos_clkout_suspend(void)
|
|
{
|
|
clkout->pmu_debug_save = readl(clkout->reg + EXYNOS_PMU_DEBUG_REG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void exynos_clkout_resume(void)
|
|
{
|
|
writel(clkout->pmu_debug_save, clkout->reg + EXYNOS_PMU_DEBUG_REG);
|
|
}
|
|
|
|
static struct syscore_ops exynos_clkout_syscore_ops = {
|
|
.suspend = exynos_clkout_suspend,
|
|
.resume = exynos_clkout_resume,
|
|
};
|
|
|
|
static void __init exynos_clkout_init(struct device_node *node, u32 mux_mask)
|
|
{
|
|
const char *parent_names[EXYNOS_CLKOUT_PARENTS];
|
|
struct clk *parents[EXYNOS_CLKOUT_PARENTS];
|
|
int parent_count;
|
|
int ret;
|
|
int i;
|
|
|
|
clkout = kzalloc(struct_size(clkout, data.hws, EXYNOS_CLKOUT_NR_CLKS),
|
|
GFP_KERNEL);
|
|
if (!clkout)
|
|
return;
|
|
|
|
spin_lock_init(&clkout->slock);
|
|
|
|
parent_count = 0;
|
|
for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i) {
|
|
char name[] = "clkoutXX";
|
|
|
|
snprintf(name, sizeof(name), "clkout%d", i);
|
|
parents[i] = of_clk_get_by_name(node, name);
|
|
if (IS_ERR(parents[i])) {
|
|
parent_names[i] = "none";
|
|
continue;
|
|
}
|
|
|
|
parent_names[i] = __clk_get_name(parents[i]);
|
|
parent_count = i + 1;
|
|
}
|
|
|
|
if (!parent_count)
|
|
goto free_clkout;
|
|
|
|
clkout->reg = of_iomap(node, 0);
|
|
if (!clkout->reg)
|
|
goto clks_put;
|
|
|
|
clkout->gate.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG;
|
|
clkout->gate.bit_idx = EXYNOS_CLKOUT_DISABLE_SHIFT;
|
|
clkout->gate.flags = CLK_GATE_SET_TO_DISABLE;
|
|
clkout->gate.lock = &clkout->slock;
|
|
|
|
clkout->mux.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG;
|
|
clkout->mux.mask = mux_mask;
|
|
clkout->mux.shift = EXYNOS_CLKOUT_MUX_SHIFT;
|
|
clkout->mux.lock = &clkout->slock;
|
|
|
|
clkout->data.hws[0] = clk_hw_register_composite(NULL, "clkout",
|
|
parent_names, parent_count, &clkout->mux.hw,
|
|
&clk_mux_ops, NULL, NULL, &clkout->gate.hw,
|
|
&clk_gate_ops, CLK_SET_RATE_PARENT
|
|
| CLK_SET_RATE_NO_REPARENT);
|
|
if (IS_ERR(clkout->data.hws[0]))
|
|
goto err_unmap;
|
|
|
|
clkout->data.num = EXYNOS_CLKOUT_NR_CLKS;
|
|
ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, &clkout->data);
|
|
if (ret)
|
|
goto err_clk_unreg;
|
|
|
|
register_syscore_ops(&exynos_clkout_syscore_ops);
|
|
|
|
return;
|
|
|
|
err_clk_unreg:
|
|
clk_hw_unregister(clkout->data.hws[0]);
|
|
err_unmap:
|
|
iounmap(clkout->reg);
|
|
clks_put:
|
|
for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i)
|
|
if (!IS_ERR(parents[i]))
|
|
clk_put(parents[i]);
|
|
free_clkout:
|
|
kfree(clkout);
|
|
|
|
pr_err("%s: failed to register clkout clock\n", __func__);
|
|
}
|
|
|
|
/*
|
|
* We use CLK_OF_DECLARE_DRIVER initialization method to avoid setting
|
|
* the OF_POPULATED flag on the pmu device tree node, so later the
|
|
* Exynos PMU platform device can be properly probed with PMU driver.
|
|
*/
|
|
|
|
static void __init exynos4_clkout_init(struct device_node *node)
|
|
{
|
|
exynos_clkout_init(node, EXYNOS4_CLKOUT_MUX_MASK);
|
|
}
|
|
CLK_OF_DECLARE_DRIVER(exynos4210_clkout, "samsung,exynos4210-pmu",
|
|
exynos4_clkout_init);
|
|
CLK_OF_DECLARE_DRIVER(exynos4412_clkout, "samsung,exynos4412-pmu",
|
|
exynos4_clkout_init);
|
|
CLK_OF_DECLARE_DRIVER(exynos3250_clkout, "samsung,exynos3250-pmu",
|
|
exynos4_clkout_init);
|
|
|
|
static void __init exynos5_clkout_init(struct device_node *node)
|
|
{
|
|
exynos_clkout_init(node, EXYNOS5_CLKOUT_MUX_MASK);
|
|
}
|
|
CLK_OF_DECLARE_DRIVER(exynos5250_clkout, "samsung,exynos5250-pmu",
|
|
exynos5_clkout_init);
|
|
CLK_OF_DECLARE_DRIVER(exynos5410_clkout, "samsung,exynos5410-pmu",
|
|
exynos5_clkout_init);
|
|
CLK_OF_DECLARE_DRIVER(exynos5420_clkout, "samsung,exynos5420-pmu",
|
|
exynos5_clkout_init);
|
|
CLK_OF_DECLARE_DRIVER(exynos5433_clkout, "samsung,exynos5433-pmu",
|
|
exynos5_clkout_init);
|