summaryrefslogtreecommitdiff
path: root/drivers/clk/samsung/clk.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/samsung/clk.c')
-rw-r--r--drivers/clk/samsung/clk.c102
1 files changed, 100 insertions, 2 deletions
diff --git a/drivers/clk/samsung/clk.c b/drivers/clk/samsung/clk.c
index deab84d9f37d..4bda54095a16 100644
--- a/drivers/clk/samsung/clk.c
+++ b/drivers/clk/samsung/clk.c
@@ -11,9 +11,13 @@
* clock framework for Samsung platforms.
*/
+#include <linux/of_address.h>
#include <linux/syscore_ops.h>
+
#include "clk.h"
+static LIST_HEAD(clock_reg_cache_list);
+
void samsung_clk_save(void __iomem *base,
struct samsung_clk_reg_dump *rd,
unsigned int num_regs)
@@ -281,7 +285,6 @@ void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
* obtain the clock speed of all external fixed clock sources from device
* tree and register it
*/
-#ifdef CONFIG_OF
void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx,
struct samsung_fixed_rate_clock *fixed_rate_clk,
unsigned int nr_fixed_rate_clk,
@@ -298,7 +301,6 @@ void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx,
}
samsung_clk_register_fixed_rate(ctx, fixed_rate_clk, nr_fixed_rate_clk);
}
-#endif
/* utility function to get the rate of a specified clock */
unsigned long _get_rate(const char *clk_name)
@@ -313,3 +315,99 @@ unsigned long _get_rate(const char *clk_name)
return clk_get_rate(clk);
}
+
+#ifdef CONFIG_PM_SLEEP
+static int samsung_clk_suspend(void)
+{
+ struct samsung_clock_reg_cache *reg_cache;
+
+ list_for_each_entry(reg_cache, &clock_reg_cache_list, node)
+ samsung_clk_save(reg_cache->reg_base, reg_cache->rdump,
+ reg_cache->rd_num);
+ return 0;
+}
+
+static void samsung_clk_resume(void)
+{
+ struct samsung_clock_reg_cache *reg_cache;
+
+ list_for_each_entry(reg_cache, &clock_reg_cache_list, node)
+ samsung_clk_restore(reg_cache->reg_base, reg_cache->rdump,
+ reg_cache->rd_num);
+}
+
+static struct syscore_ops samsung_clk_syscore_ops = {
+ .suspend = samsung_clk_suspend,
+ .resume = samsung_clk_resume,
+};
+
+static void samsung_clk_sleep_init(void __iomem *reg_base,
+ const unsigned long *rdump,
+ unsigned long nr_rdump)
+{
+ struct samsung_clock_reg_cache *reg_cache;
+
+ reg_cache = kzalloc(sizeof(struct samsung_clock_reg_cache),
+ GFP_KERNEL);
+ if (!reg_cache)
+ panic("could not allocate register reg_cache.\n");
+ reg_cache->rdump = samsung_clk_alloc_reg_dump(rdump, nr_rdump);
+
+ if (!reg_cache->rdump)
+ panic("could not allocate register dump storage.\n");
+
+ if (list_empty(&clock_reg_cache_list))
+ register_syscore_ops(&samsung_clk_syscore_ops);
+
+ reg_cache->reg_base = reg_base;
+ reg_cache->rd_num = nr_rdump;
+ list_add_tail(&reg_cache->node, &clock_reg_cache_list);
+}
+
+#else
+static void samsung_clk_sleep_init(void __iomem *reg_base,
+ const unsigned long *rdump,
+ unsigned long nr_rdump) {}
+#endif
+
+/*
+ * Common function which registers plls, muxes, dividers and gates
+ * for each CMU. It also add CMU register list to register cache.
+ */
+void __init samsung_cmu_register_one(struct device_node *np,
+ struct samsung_cmu_info *cmu)
+{
+ void __iomem *reg_base;
+ struct samsung_clk_provider *ctx;
+
+ reg_base = of_iomap(np, 0);
+ if (!reg_base)
+ panic("%s: failed to map registers\n", __func__);
+
+ ctx = samsung_clk_init(np, reg_base, cmu->nr_clk_ids);
+ if (!ctx)
+ panic("%s: unable to alllocate ctx\n", __func__);
+
+ if (cmu->pll_clks)
+ samsung_clk_register_pll(ctx, cmu->pll_clks, cmu->nr_pll_clks,
+ reg_base);
+ if (cmu->mux_clks)
+ samsung_clk_register_mux(ctx, cmu->mux_clks,
+ cmu->nr_mux_clks);
+ if (cmu->div_clks)
+ samsung_clk_register_div(ctx, cmu->div_clks, cmu->nr_div_clks);
+ if (cmu->gate_clks)
+ samsung_clk_register_gate(ctx, cmu->gate_clks,
+ cmu->nr_gate_clks);
+ if (cmu->fixed_clks)
+ samsung_clk_register_fixed_rate(ctx, cmu->fixed_clks,
+ cmu->nr_fixed_clks);
+ if (cmu->fixed_factor_clks)
+ samsung_clk_register_fixed_factor(ctx, cmu->fixed_factor_clks,
+ cmu->nr_fixed_factor_clks);
+ if (cmu->clk_regs)
+ samsung_clk_sleep_init(reg_base, cmu->clk_regs,
+ cmu->nr_clk_regs);
+
+ samsung_clk_of_add_provider(np, ctx);
+}