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Subject[PATCH v2 1/3] clk: samsung: exynos3250: Register DMC clk provider
Date
Add clock provider for clocks in DMC domain including EPLL and BPLL. The
DMC clocks are necessary for Exynos3 devfreq driver.

The DMC clock domain uses different address space (0x105C0000) than
standard clock domain (0x10030000 - 0x10050000). The difference is huge
enough to add new DT node for the clock provider, rather than extending
existing address space.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

---

Changes since v1:
=================
1. Fix overwritteing main clock provider reg_base with DMC clock domain
reg_basr. This leads to OOPS in suspend.
---
drivers/clk/samsung/clk-exynos3250.c | 195 +++++++++++++++++++++++++++++++++
include/dt-bindings/clock/exynos3250.h | 27 +++++
2 files changed, 222 insertions(+)

diff --git a/drivers/clk/samsung/clk-exynos3250.c b/drivers/clk/samsung/clk-exynos3250.c
index dc85f8e7a2d7..6840dc71c72b 100644
--- a/drivers/clk/samsung/clk-exynos3250.c
+++ b/drivers/clk/samsung/clk-exynos3250.c
@@ -110,7 +110,14 @@ enum exynos3250_plls {
nr_plls
};

+/* list of PLLs in DMC block to be registered */
+enum exynos3250_dmc_plls {
+ bpll, epll,
+ nr_dmc_plls
+};
+
static void __iomem *reg_base;
+static void __iomem *dmc_reg_base;

/*
* Support for CMU save/restore across system suspends
@@ -724,6 +731,25 @@ static struct samsung_pll_rate_table exynos3250_pll_rates[] = {
{ /* sentinel */ }
};

+/* EPLL */
+static struct samsung_pll_rate_table exynos3250_epll_rates[] = {
+ PLL_36XX_RATE(800000000, 200, 3, 1, 0),
+ PLL_36XX_RATE(288000000, 96, 2, 2, 0),
+ PLL_36XX_RATE(192000000, 128, 2, 3, 0),
+ PLL_36XX_RATE(144000000, 96, 2, 3, 0),
+ PLL_36XX_RATE( 96000000, 128, 2, 4, 0),
+ PLL_36XX_RATE( 84000000, 112, 2, 4, 0),
+ PLL_36XX_RATE( 80000004, 106, 2, 4, 43691),
+ PLL_36XX_RATE( 73728000, 98, 2, 4, 19923),
+ PLL_36XX_RATE( 67737598, 270, 3, 5, 62285),
+ PLL_36XX_RATE( 65535999, 174, 2, 5, 49982),
+ PLL_36XX_RATE( 50000000, 200, 3, 5, 0),
+ PLL_36XX_RATE( 49152002, 131, 2, 5, 4719),
+ PLL_36XX_RATE( 48000000, 128, 2, 5, 0),
+ PLL_36XX_RATE( 45158401, 180, 3, 5, 41524),
+ { /* sentinel */ }
+};
+
/* VPLL */
static struct samsung_pll_rate_table exynos3250_vpll_rates[] = {
PLL_36XX_RATE(600000000, 100, 2, 1, 0),
@@ -821,3 +847,172 @@ static void __init exynos3250_cmu_init(struct device_node *np)
samsung_clk_of_add_provider(np, ctx);
}
CLK_OF_DECLARE(exynos3250_cmu, "samsung,exynos3250-cmu", exynos3250_cmu_init);
+
+/*
+ * CMU DMC
+ */
+
+#define BPLL_LOCK 0x0118
+#define BPLL_CON0 0x0218
+#define BPLL_CON1 0x021c
+#define BPLL_CON2 0x0220
+#define SRC_DMC 0x0300
+#define DIV_DMC1 0x0504
+#define GATE_BUS_DMC0 0x0700
+#define GATE_BUS_DMC1 0x0704
+#define GATE_BUS_DMC2 0x0708
+#define GATE_BUS_DMC3 0x070c
+#define GATE_SCLK_DMC 0x0800
+#define GATE_IP_DMC0 0x0900
+#define GATE_IP_DMC1 0x0904
+#define EPLL_LOCK 0x1110
+#define EPLL_CON0 0x1114
+#define EPLL_CON1 0x1118
+#define EPLL_CON2 0x111c
+#define SRC_EPLL 0x1120
+
+/*
+ * Support for CMU save/restore across system suspends
+ */
+#ifdef CONFIG_PM_SLEEP
+static struct samsung_clk_reg_dump *exynos3250_dmc_clk_regs;
+
+static unsigned long exynos3250_cmu_dmc_clk_regs[] __initdata = {
+ BPLL_LOCK,
+ BPLL_CON0,
+ BPLL_CON1,
+ BPLL_CON2,
+ SRC_DMC,
+ DIV_DMC1,
+ GATE_BUS_DMC0,
+ GATE_BUS_DMC1,
+ GATE_BUS_DMC2,
+ GATE_BUS_DMC3,
+ GATE_SCLK_DMC,
+ GATE_IP_DMC0,
+ GATE_IP_DMC1,
+ EPLL_LOCK,
+ EPLL_CON0,
+ EPLL_CON1,
+ EPLL_CON2,
+ SRC_EPLL,
+};
+
+static int exynos3250_dmc_clk_suspend(void)
+{
+ samsung_clk_save(dmc_reg_base, exynos3250_dmc_clk_regs,
+ ARRAY_SIZE(exynos3250_cmu_dmc_clk_regs));
+ return 0;
+}
+
+static void exynos3250_dmc_clk_resume(void)
+{
+ samsung_clk_restore(dmc_reg_base, exynos3250_dmc_clk_regs,
+ ARRAY_SIZE(exynos3250_cmu_dmc_clk_regs));
+}
+
+static struct syscore_ops exynos3250_dmc_clk_syscore_ops = {
+ .suspend = exynos3250_dmc_clk_suspend,
+ .resume = exynos3250_dmc_clk_resume,
+};
+
+static void exynos3250_dmc_clk_sleep_init(void)
+{
+ exynos3250_dmc_clk_regs =
+ samsung_clk_alloc_reg_dump(exynos3250_cmu_dmc_clk_regs,
+ ARRAY_SIZE(exynos3250_cmu_dmc_clk_regs));
+ if (!exynos3250_dmc_clk_regs) {
+ pr_warn("%s: Failed to allocate sleep save data\n", __func__);
+ goto err;
+ }
+
+ register_syscore_ops(&exynos3250_dmc_clk_syscore_ops);
+ return;
+err:
+ kfree(exynos3250_dmc_clk_regs);
+}
+#else
+static inline void exynos3250_dmc_clk_sleep_init(void) { }
+#endif
+
+PNAME(mout_epll_p) = { "fin_pll", "fout_epll", };
+PNAME(mout_bpll_p) = { "fin_pll", "fout_bpll", };
+PNAME(mout_mpll_mif_p) = { "fin_pll", "sclk_mpll_mif", };
+PNAME(mout_dphy_p) = { "mout_mpll_mif", "mout_bpll", };
+
+static struct samsung_mux_clock dmc_mux_clks[] __initdata = {
+ /*
+ * NOTE: Following table is sorted by register address in ascending
+ * order and then bitfield shift in descending order, as it is done
+ * in the User's Manual. When adding new entries, please make sure
+ * that the order is preserved, to avoid merge conflicts and make
+ * further work with defined data easier.
+ */
+
+ /* SRC_DMC */
+ MUX(CLK_MOUT_MPLL_MIF, "mout_mpll_mif", mout_mpll_mif_p, SRC_DMC, 12, 1),
+ MUX(CLK_MOUT_BPLL, "mout_bpll", mout_bpll_p, SRC_DMC, 10, 1),
+ MUX(CLK_MOUT_DPHY, "mout_dphy", mout_dphy_p, SRC_DMC, 8, 1),
+ MUX(CLK_MOUT_DMC_BUS, "mout_dmc_bus", mout_dphy_p, SRC_DMC, 4, 1),
+
+ /* SRC_EPLL */
+ MUX(CLK_MOUT_EPLL, "mout_epll", mout_epll_p, SRC_EPLL, 4, 1),
+};
+
+static struct samsung_div_clock dmc_div_clks[] __initdata = {
+ /*
+ * NOTE: Following table is sorted by register address in ascending
+ * order and then bitfield shift in descending order, as it is done
+ * in the User's Manual. When adding new entries, please make sure
+ * that the order is preserved, to avoid merge conflicts and make
+ * further work with defined data easier.
+ */
+
+ /* DIV_DMC1 */
+ DIV(CLK_DIV_DMC, "div_dmc", "div_dmc_pre", DIV_DMC1, 27, 3),
+ DIV(CLK_DIV_DPHY, "div_dphy", "mout_dphy", DIV_DMC1, 23, 3),
+ DIV(CLK_DIV_DMC_PRE, "div_dmc_pre", "mout_dmc_bus", DIV_DMC1, 19, 2),
+ DIV(CLK_DIV_DMCP, "div_dmcp", "div_dmcd", DIV_DMC1, 15, 3),
+ DIV(CLK_DIV_DMCD, "div_dmcd", "div_dmc", DIV_DMC1, 11, 3),
+};
+
+static struct samsung_pll_clock exynos3250_dmc_plls[nr_dmc_plls] __initdata = {
+ [bpll] = PLL(pll_35xx, CLK_FOUT_BPLL, "fout_bpll", "fin_pll",
+ BPLL_LOCK, BPLL_CON0, NULL),
+ [epll] = PLL(pll_36xx, CLK_FOUT_EPLL, "fout_epll", "fin_pll",
+ EPLL_LOCK, EPLL_CON0, NULL),
+};
+
+static void __init exynos3250_cmu_dmc_init(struct device_node *np)
+{
+ struct samsung_clk_provider *ctx;
+
+ dmc_reg_base = of_iomap(np, 0);
+ if (!dmc_reg_base)
+ panic("%s: failed to map registers\n", __func__);
+
+ ctx = samsung_clk_init(np, dmc_reg_base, NR_CLKS_DMC);
+ if (!ctx)
+ panic("%s: unable to allocate context.\n", __func__);
+
+ exynos3250_dmc_plls[bpll].rate_table = exynos3250_pll_rates;
+ exynos3250_dmc_plls[epll].rate_table = exynos3250_epll_rates;
+
+ pr_err("CLK registering epll bpll: %d, %d, %d, %d\n",
+ exynos3250_dmc_plls[bpll].rate_table[0].rate,
+ exynos3250_dmc_plls[bpll].rate_table[0].mdiv,
+ exynos3250_dmc_plls[bpll].rate_table[0].pdiv,
+ exynos3250_dmc_plls[bpll].rate_table[0].sdiv
+ );
+ samsung_clk_register_pll(ctx, exynos3250_dmc_plls,
+ ARRAY_SIZE(exynos3250_dmc_plls), dmc_reg_base);
+
+ samsung_clk_register_mux(ctx, dmc_mux_clks, ARRAY_SIZE(dmc_mux_clks));
+ samsung_clk_register_div(ctx, dmc_div_clks, ARRAY_SIZE(dmc_div_clks));
+
+ exynos3250_dmc_clk_sleep_init();
+
+ samsung_clk_of_add_provider(np, ctx);
+}
+CLK_OF_DECLARE(exynos3250_cmu_dmc, "samsung,exynos3250-cmu-dmc",
+ exynos3250_cmu_dmc_init);
diff --git a/include/dt-bindings/clock/exynos3250.h b/include/dt-bindings/clock/exynos3250.h
index b535e9da7de6..961b9c130ea9 100644
--- a/include/dt-bindings/clock/exynos3250.h
+++ b/include/dt-bindings/clock/exynos3250.h
@@ -255,4 +255,31 @@
*/
#define CLK_NR_CLKS 248

+/*
+ * CMU DMC
+ */
+
+#define CLK_FOUT_BPLL 1
+#define CLK_FOUT_EPLL 2
+
+/* Muxes */
+#define CLK_MOUT_MPLL_MIF 8
+#define CLK_MOUT_BPLL 9
+#define CLK_MOUT_DPHY 10
+#define CLK_MOUT_DMC_BUS 11
+#define CLK_MOUT_EPLL 12
+
+/* Dividers */
+#define CLK_DIV_DMC 16
+#define CLK_DIV_DPHY 17
+#define CLK_DIV_DMC_PRE 18
+#define CLK_DIV_DMCP 19
+#define CLK_DIV_DMCD 20
+
+/*
+ * Total number of clocks of main CMU.
+ * NOTE: Must be equal to last clock ID increased by one.
+ */
+#define NR_CLKS_DMC 21
+
#endif /* _DT_BINDINGS_CLOCK_SAMSUNG_EXYNOS3250_CLOCK_H */
--
1.9.1


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