Merge tag 'mvebu-clk-4.1' of git://git.infradead.org/linux-mvebu into clk-next

clock changes for mvebu for v4.1

- Add clock support for Armada 39x

5 files changed, 179 insertions, 0 deletions

diff --git a/drivers/clk/mvebu/Kconfig b/drivers/clk/mvebu/Kconfig
index 3b34dba9178d..27696255486d 100644
--- a/drivers/clk/mvebu/Kconfig
+++ b/drivers/clk/mvebu/Kconfig
@@ -21,6 +21,10 @@ config ARMADA_38X_CLK
 	bool
 	select MVEBU_CLK_COMMON
 
+config ARMADA_39X_CLK
+	bool
+	select MVEBU_CLK_COMMON
+
 config ARMADA_XP_CLK
 	bool
 	select MVEBU_CLK_COMMON
diff --git a/drivers/clk/mvebu/Makefile b/drivers/clk/mvebu/Makefile
index a9a56fc01901..645ac7ea3565 100644
--- a/drivers/clk/mvebu/Makefile
+++ b/drivers/clk/mvebu/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_MVEBU_CLK_COREDIV)	+= clk-corediv.o
 obj-$(CONFIG_ARMADA_370_CLK)	+= armada-370.o
 obj-$(CONFIG_ARMADA_375_CLK)	+= armada-375.o
 obj-$(CONFIG_ARMADA_38X_CLK)	+= armada-38x.o
+obj-$(CONFIG_ARMADA_39X_CLK)	+= armada-39x.o
 obj-$(CONFIG_ARMADA_XP_CLK)	+= armada-xp.o
 obj-$(CONFIG_DOVE_CLK)		+= dove.o
 obj-$(CONFIG_KIRKWOOD_CLK)	+= kirkwood.o
diff --git a/drivers/clk/mvebu/armada-39x.c b/drivers/clk/mvebu/armada-39x.c
new file mode 100644
index 000000000000..efb974df9822
--- /dev/null
+++ b/drivers/clk/mvebu/armada-39x.c
@@ -0,0 +1,156 @@
+/*
+ * Marvell Armada 39x SoC clocks
+ *
+ * Copyright (C) 2015 Marvell
+ *
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ * Andrew Lunn <andrew@lunn.ch>
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include "common.h"
+
+/*
+ * SARL[14:10] : Ratios between CPU, NBCLK, HCLK and DCLK.
+ *
+ * SARL[15]    : TCLK frequency
+ *		 0 = 250 MHz
+ *		 1 = 200 MHz
+ *
+ * SARH[0]     : Reference clock frequency
+ *               0 = 25 Mhz
+ *               1 = 40 Mhz
+ */
+
+#define SARL 					0
+#define  SARL_A390_TCLK_FREQ_OPT		15
+#define  SARL_A390_TCLK_FREQ_OPT_MASK		0x1
+#define  SARL_A390_CPU_DDR_L2_FREQ_OPT		10
+#define  SARL_A390_CPU_DDR_L2_FREQ_OPT_MASK	0x1F
+#define SARH					4
+#define  SARH_A390_REFCLK_FREQ			BIT(0)
+
+static const u32 armada_39x_tclk_frequencies[] __initconst = {
+	250000000,
+	200000000,
+};
+
+static u32 __init armada_39x_get_tclk_freq(void __iomem *sar)
+{
+	u8 tclk_freq_select;
+
+	tclk_freq_select = ((readl(sar + SARL) >> SARL_A390_TCLK_FREQ_OPT) &
+			    SARL_A390_TCLK_FREQ_OPT_MASK);
+	return armada_39x_tclk_frequencies[tclk_freq_select];
+}
+
+static const u32 armada_39x_cpu_frequencies[] __initconst = {
+	[0x0] = 666 * 1000 * 1000,
+	[0x2] = 800 * 1000 * 1000,
+	[0x3] = 800 * 1000 * 1000,
+	[0x4] = 1066 * 1000 * 1000,
+	[0x5] = 1066 * 1000 * 1000,
+	[0x6] = 1200 * 1000 * 1000,
+	[0x8] = 1332 * 1000 * 1000,
+	[0xB] = 1600 * 1000 * 1000,
+	[0xC] = 1600 * 1000 * 1000,
+	[0x12] = 1800 * 1000 * 1000,
+	[0x1E] = 1800 * 1000 * 1000,
+};
+
+static u32 __init armada_39x_get_cpu_freq(void __iomem *sar)
+{
+	u8 cpu_freq_select;
+
+	cpu_freq_select = ((readl(sar + SARL) >> SARL_A390_CPU_DDR_L2_FREQ_OPT) &
+			   SARL_A390_CPU_DDR_L2_FREQ_OPT_MASK);
+	if (cpu_freq_select >= ARRAY_SIZE(armada_39x_cpu_frequencies)) {
+		pr_err("Selected CPU frequency (%d) unsupported\n",
+			cpu_freq_select);
+		return 0;
+	}
+
+	return armada_39x_cpu_frequencies[cpu_freq_select];
+}
+
+enum { A390_CPU_TO_NBCLK, A390_CPU_TO_HCLK, A390_CPU_TO_DCLK };
+
+static const struct coreclk_ratio armada_39x_coreclk_ratios[] __initconst = {
+	{ .id = A390_CPU_TO_NBCLK, .name = "nbclk" },
+	{ .id = A390_CPU_TO_HCLK, .name = "hclk" },
+	{ .id = A390_CPU_TO_DCLK, .name = "dclk" },
+};
+
+static void __init armada_39x_get_clk_ratio(
+	void __iomem *sar, int id, int *mult, int *div)
+{
+	switch (id) {
+	case A390_CPU_TO_NBCLK:
+		*mult = 1;
+		*div = 2;
+		break;
+	case A390_CPU_TO_HCLK:
+		*mult = 1;
+		*div = 4;
+		break;
+	case A390_CPU_TO_DCLK:
+		*mult = 1;
+		*div = 2;
+		break;
+	}
+}
+
+static u32 __init armada_39x_refclk_ratio(void __iomem *sar)
+{
+	if (readl(sar + SARH) & SARH_A390_REFCLK_FREQ)
+		return 40 * 1000 * 1000;
+	else
+		return 25 * 1000 * 1000;
+}
+
+static const struct coreclk_soc_desc armada_39x_coreclks = {
+	.get_tclk_freq = armada_39x_get_tclk_freq,
+	.get_cpu_freq = armada_39x_get_cpu_freq,
+	.get_clk_ratio = armada_39x_get_clk_ratio,
+	.get_refclk_freq = armada_39x_refclk_ratio,
+	.ratios = armada_39x_coreclk_ratios,
+	.num_ratios = ARRAY_SIZE(armada_39x_coreclk_ratios),
+};
+
+static void __init armada_39x_coreclk_init(struct device_node *np)
+{
+	mvebu_coreclk_setup(np, &armada_39x_coreclks);
+}
+CLK_OF_DECLARE(armada_39x_core_clk, "marvell,armada-390-core-clock",
+	       armada_39x_coreclk_init);
+
+/*
+ * Clock Gating Control
+ */
+static const struct clk_gating_soc_desc armada_39x_gating_desc[] __initconst = {
+	{ "pex1", NULL, 5 },
+	{ "pex2", NULL, 6 },
+	{ "pex3", NULL, 7 },
+	{ "pex0", NULL, 8 },
+	{ "usb3h0", NULL, 9 },
+	{ "sdio", NULL, 17 },
+	{ "xor0", NULL, 22 },
+	{ "xor1", NULL, 28 },
+	{ }
+};
+
+static void __init armada_39x_clk_gating_init(struct device_node *np)
+{
+	mvebu_clk_gating_setup(np, armada_39x_gating_desc);
+}
+CLK_OF_DECLARE(armada_39x_clk_gating, "marvell,armada-390-gating-clock",
+	       armada_39x_clk_gating_init);
diff --git a/drivers/clk/mvebu/common.c b/drivers/clk/mvebu/common.c
index 0d4d1216f2dd..15b370ff3748 100644
--- a/drivers/clk/mvebu/common.c
+++ b/drivers/clk/mvebu/common.c
@@ -121,6 +121,11 @@ void __init mvebu_coreclk_setup(struct device_node *np,
 
 	/* Allocate struct for TCLK, cpu clk, and core ratio clocks */
 	clk_data.clk_num = 2 + desc->num_ratios;
+
+	/* One more clock for the optional refclk */
+	if (desc->get_refclk_freq)
+		clk_data.clk_num += 1;
+
 	clk_data.clks = kzalloc(clk_data.clk_num * sizeof(struct clk *),
 				GFP_KERNEL);
 	if (WARN_ON(!clk_data.clks)) {
@@ -162,6 +167,18 @@ void __init mvebu_coreclk_setup(struct device_node *np,
 		WARN_ON(IS_ERR(clk_data.clks[2+n]));
 	};
 
+	/* Register optional refclk */
+	if (desc->get_refclk_freq) {
+		const char *name = "refclk";
+		of_property_read_string_index(np, "clock-output-names",
+					      2 + desc->num_ratios, &name);
+		rate = desc->get_refclk_freq(base);
+		clk_data.clks[2 + desc->num_ratios] =
+			clk_register_fixed_rate(NULL, name, NULL,
+						CLK_IS_ROOT, rate);
+		WARN_ON(IS_ERR(clk_data.clks[2 + desc->num_ratios]));
+	}
+
 	/* SAR register isn't needed anymore */
 	iounmap(base);
 
diff --git a/drivers/clk/mvebu/common.h b/drivers/clk/mvebu/common.h
index 783b5631a453..f0de6c8a494a 100644
--- a/drivers/clk/mvebu/common.h
+++ b/drivers/clk/mvebu/common.h
@@ -30,6 +30,7 @@ struct coreclk_soc_desc {
 	u32 (*get_tclk_freq)(void __iomem *sar);
 	u32 (*get_cpu_freq)(void __iomem *sar);
 	void (*get_clk_ratio)(void __iomem *sar, int id, int *mult, int *div);
+	u32 (*get_refclk_freq)(void __iomem *sar);
 	bool (*is_sscg_enabled)(void __iomem *sar);
 	u32 (*fix_sscg_deviation)(u32 system_clk);
 	const struct coreclk_ratio *ratios;