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path: root/drivers/clk/samsung/clk-exynos4.c
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Diffstat (limited to 'drivers/clk/samsung/clk-exynos4.c')
-rw-r--r--drivers/clk/samsung/clk-exynos4.c172
1 files changed, 152 insertions, 20 deletions
diff --git a/drivers/clk/samsung/clk-exynos4.c b/drivers/clk/samsung/clk-exynos4.c
index 010f071af88..b4f96721017 100644
--- a/drivers/clk/samsung/clk-exynos4.c
+++ b/drivers/clk/samsung/clk-exynos4.c
@@ -16,6 +16,7 @@
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/syscore_ops.h>
#include "clk.h"
@@ -130,6 +131,17 @@ enum exynos4_plls {
nr_plls /* number of PLLs */
};
+static void __iomem *reg_base;
+static enum exynos4_soc exynos4_soc;
+
+/*
+ * Support for CMU save/restore across system suspends
+ */
+#ifdef CONFIG_PM_SLEEP
+static struct samsung_clk_reg_dump *exynos4_save_common;
+static struct samsung_clk_reg_dump *exynos4_save_soc;
+static struct samsung_clk_reg_dump *exynos4_save_pll;
+
/*
* list of controller registers to be saved and restored during a
* suspend/resume cycle.
@@ -154,6 +166,17 @@ static unsigned long exynos4x12_clk_save[] __initdata = {
E4X12_MPLL_CON0,
};
+static unsigned long exynos4_clk_pll_regs[] __initdata = {
+ EPLL_LOCK,
+ VPLL_LOCK,
+ EPLL_CON0,
+ EPLL_CON1,
+ EPLL_CON2,
+ VPLL_CON0,
+ VPLL_CON1,
+ VPLL_CON2,
+};
+
static unsigned long exynos4_clk_regs[] __initdata = {
SRC_LEFTBUS,
DIV_LEFTBUS,
@@ -161,12 +184,6 @@ static unsigned long exynos4_clk_regs[] __initdata = {
SRC_RIGHTBUS,
DIV_RIGHTBUS,
GATE_IP_RIGHTBUS,
- EPLL_CON0,
- EPLL_CON1,
- EPLL_CON2,
- VPLL_CON0,
- VPLL_CON1,
- VPLL_CON2,
SRC_TOP0,
SRC_TOP1,
SRC_CAM,
@@ -227,6 +244,124 @@ static unsigned long exynos4_clk_regs[] __initdata = {
GATE_IP_CPU,
};
+static const struct samsung_clk_reg_dump src_mask_suspend[] = {
+ { .offset = SRC_MASK_TOP, .value = 0x00000001, },
+ { .offset = SRC_MASK_CAM, .value = 0x11111111, },
+ { .offset = SRC_MASK_TV, .value = 0x00000111, },
+ { .offset = SRC_MASK_LCD0, .value = 0x00001111, },
+ { .offset = SRC_MASK_MAUDIO, .value = 0x00000001, },
+ { .offset = SRC_MASK_FSYS, .value = 0x01011111, },
+ { .offset = SRC_MASK_PERIL0, .value = 0x01111111, },
+ { .offset = SRC_MASK_PERIL1, .value = 0x01110111, },
+ { .offset = SRC_MASK_DMC, .value = 0x00010000, },
+};
+
+static const struct samsung_clk_reg_dump src_mask_suspend_e4210[] = {
+ { .offset = E4210_SRC_MASK_LCD1, .value = 0x00001111, },
+};
+
+#define PLL_ENABLED (1 << 31)
+#define PLL_LOCKED (1 << 29)
+
+static void exynos4_clk_wait_for_pll(u32 reg)
+{
+ u32 pll_con;
+
+ pll_con = readl(reg_base + reg);
+ if (!(pll_con & PLL_ENABLED))
+ return;
+
+ while (!(pll_con & PLL_LOCKED)) {
+ cpu_relax();
+ pll_con = readl(reg_base + reg);
+ }
+}
+
+static int exynos4_clk_suspend(void)
+{
+ samsung_clk_save(reg_base, exynos4_save_common,
+ ARRAY_SIZE(exynos4_clk_regs));
+ samsung_clk_save(reg_base, exynos4_save_pll,
+ ARRAY_SIZE(exynos4_clk_pll_regs));
+
+ if (exynos4_soc == EXYNOS4210) {
+ samsung_clk_save(reg_base, exynos4_save_soc,
+ ARRAY_SIZE(exynos4210_clk_save));
+ samsung_clk_restore(reg_base, src_mask_suspend_e4210,
+ ARRAY_SIZE(src_mask_suspend_e4210));
+ } else {
+ samsung_clk_save(reg_base, exynos4_save_soc,
+ ARRAY_SIZE(exynos4x12_clk_save));
+ }
+
+ samsung_clk_restore(reg_base, src_mask_suspend,
+ ARRAY_SIZE(src_mask_suspend));
+
+ return 0;
+}
+
+static void exynos4_clk_resume(void)
+{
+ samsung_clk_restore(reg_base, exynos4_save_pll,
+ ARRAY_SIZE(exynos4_clk_pll_regs));
+
+ exynos4_clk_wait_for_pll(EPLL_CON0);
+ exynos4_clk_wait_for_pll(VPLL_CON0);
+
+ samsung_clk_restore(reg_base, exynos4_save_common,
+ ARRAY_SIZE(exynos4_clk_regs));
+
+ if (exynos4_soc == EXYNOS4210)
+ samsung_clk_restore(reg_base, exynos4_save_soc,
+ ARRAY_SIZE(exynos4210_clk_save));
+ else
+ samsung_clk_restore(reg_base, exynos4_save_soc,
+ ARRAY_SIZE(exynos4x12_clk_save));
+}
+
+static struct syscore_ops exynos4_clk_syscore_ops = {
+ .suspend = exynos4_clk_suspend,
+ .resume = exynos4_clk_resume,
+};
+
+static void exynos4_clk_sleep_init(void)
+{
+ exynos4_save_common = samsung_clk_alloc_reg_dump(exynos4_clk_regs,
+ ARRAY_SIZE(exynos4_clk_regs));
+ if (!exynos4_save_common)
+ goto err_warn;
+
+ if (exynos4_soc == EXYNOS4210)
+ exynos4_save_soc = samsung_clk_alloc_reg_dump(
+ exynos4210_clk_save,
+ ARRAY_SIZE(exynos4210_clk_save));
+ else
+ exynos4_save_soc = samsung_clk_alloc_reg_dump(
+ exynos4x12_clk_save,
+ ARRAY_SIZE(exynos4x12_clk_save));
+ if (!exynos4_save_soc)
+ goto err_common;
+
+ exynos4_save_pll = samsung_clk_alloc_reg_dump(exynos4_clk_pll_regs,
+ ARRAY_SIZE(exynos4_clk_pll_regs));
+ if (!exynos4_save_pll)
+ goto err_soc;
+
+ register_syscore_ops(&exynos4_clk_syscore_ops);
+ return;
+
+err_soc:
+ kfree(exynos4_save_soc);
+err_common:
+ kfree(exynos4_save_common);
+err_warn:
+ pr_warn("%s: failed to allocate sleep save data, no sleep support!\n",
+ __func__);
+}
+#else
+static void exynos4_clk_sleep_init(void) {}
+#endif
+
/* list of all parent clock list */
PNAME(mout_apll_p) = { "fin_pll", "fout_apll", };
PNAME(mout_mpll_p) = { "fin_pll", "fout_mpll", };
@@ -908,12 +1043,13 @@ static unsigned long exynos4_get_xom(void)
return xom;
}
-static void __init exynos4_clk_register_finpll(unsigned long xom)
+static void __init exynos4_clk_register_finpll(void)
{
struct samsung_fixed_rate_clock fclk;
struct clk *clk;
unsigned long finpll_f = 24000000;
char *parent_name;
+ unsigned int xom = exynos4_get_xom();
parent_name = xom & 1 ? "xusbxti" : "xxti";
clk = clk_get(NULL, parent_name);
@@ -1038,27 +1174,21 @@ static struct samsung_pll_clock exynos4x12_plls[nr_plls] __initdata = {
/* register exynos4 clocks */
static void __init exynos4_clk_init(struct device_node *np,
- enum exynos4_soc exynos4_soc,
- void __iomem *reg_base, unsigned long xom)
+ enum exynos4_soc soc)
{
+ exynos4_soc = soc;
+
reg_base = of_iomap(np, 0);
if (!reg_base)
panic("%s: failed to map registers\n", __func__);
- if (exynos4_soc == EXYNOS4210)
- samsung_clk_init(np, reg_base, CLK_NR_CLKS,
- exynos4_clk_regs, ARRAY_SIZE(exynos4_clk_regs),
- exynos4210_clk_save, ARRAY_SIZE(exynos4210_clk_save));
- else
- samsung_clk_init(np, reg_base, CLK_NR_CLKS,
- exynos4_clk_regs, ARRAY_SIZE(exynos4_clk_regs),
- exynos4x12_clk_save, ARRAY_SIZE(exynos4x12_clk_save));
+ samsung_clk_init(np, reg_base, CLK_NR_CLKS);
samsung_clk_of_register_fixed_ext(exynos4_fixed_rate_ext_clks,
ARRAY_SIZE(exynos4_fixed_rate_ext_clks),
ext_clk_match);
- exynos4_clk_register_finpll(xom);
+ exynos4_clk_register_finpll();
if (exynos4_soc == EXYNOS4210) {
samsung_clk_register_mux(exynos4210_mux_early,
@@ -1125,6 +1255,8 @@ static void __init exynos4_clk_init(struct device_node *np,
samsung_clk_register_alias(exynos4_aliases,
ARRAY_SIZE(exynos4_aliases));
+ exynos4_clk_sleep_init();
+
pr_info("%s clocks: sclk_apll = %ld, sclk_mpll = %ld\n"
"\tsclk_epll = %ld, sclk_vpll = %ld, arm_clk = %ld\n",
exynos4_soc == EXYNOS4210 ? "Exynos4210" : "Exynos4x12",
@@ -1136,12 +1268,12 @@ static void __init exynos4_clk_init(struct device_node *np,
static void __init exynos4210_clk_init(struct device_node *np)
{
- exynos4_clk_init(np, EXYNOS4210, NULL, exynos4_get_xom());
+ exynos4_clk_init(np, EXYNOS4210);
}
CLK_OF_DECLARE(exynos4210_clk, "samsung,exynos4210-clock", exynos4210_clk_init);
static void __init exynos4412_clk_init(struct device_node *np)
{
- exynos4_clk_init(np, EXYNOS4X12, NULL, exynos4_get_xom());
+ exynos4_clk_init(np, EXYNOS4X12);
}
CLK_OF_DECLARE(exynos4412_clk, "samsung,exynos4412-clock", exynos4412_clk_init);