Initial import

1 files changed, 183 insertions, 0 deletions

diff --git a/drivers/clk/mvebu/armada-370.c b/drivers/clk/mvebu/armada-370.c
new file mode 100644
index 000000000..756f0f39d
--- /dev/null
+++ b/drivers/clk/mvebu/armada-370.c
@@ -0,0 +1,183 @@
+/*
+ * Marvell Armada 370 SoC clocks
+ *
+ * Copyright (C) 2012 Marvell
+ *
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ * Andrew Lunn <andrew@lunn.ch>
+ *
+ * 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"
+
+/*
+ * Core Clocks
+ */
+
+#define SARL				0	/* Low part [0:31] */
+#define	 SARL_A370_SSCG_ENABLE		BIT(10)
+#define	 SARL_A370_PCLK_FREQ_OPT	11
+#define	 SARL_A370_PCLK_FREQ_OPT_MASK	0xF
+#define	 SARL_A370_FAB_FREQ_OPT		15
+#define	 SARL_A370_FAB_FREQ_OPT_MASK	0x1F
+#define	 SARL_A370_TCLK_FREQ_OPT	20
+#define	 SARL_A370_TCLK_FREQ_OPT_MASK	0x1
+
+enum { A370_CPU_TO_NBCLK, A370_CPU_TO_HCLK, A370_CPU_TO_DRAMCLK };
+
+static const struct coreclk_ratio a370_coreclk_ratios[] __initconst = {
+	{ .id = A370_CPU_TO_NBCLK, .name = "nbclk" },
+	{ .id = A370_CPU_TO_HCLK, .name = "hclk" },
+	{ .id = A370_CPU_TO_DRAMCLK, .name = "dramclk" },
+};
+
+static const u32 a370_tclk_freqs[] __initconst = {
+	166000000,
+	200000000,
+};
+
+static u32 __init a370_get_tclk_freq(void __iomem *sar)
+{
+	u8 tclk_freq_select = 0;
+
+	tclk_freq_select = ((readl(sar) >> SARL_A370_TCLK_FREQ_OPT) &
+			    SARL_A370_TCLK_FREQ_OPT_MASK);
+	return a370_tclk_freqs[tclk_freq_select];
+}
+
+static const u32 a370_cpu_freqs[] __initconst = {
+	400000000,
+	533000000,
+	667000000,
+	800000000,
+	1000000000,
+	1067000000,
+	1200000000,
+};
+
+static u32 __init a370_get_cpu_freq(void __iomem *sar)
+{
+	u32 cpu_freq;
+	u8 cpu_freq_select = 0;
+
+	cpu_freq_select = ((readl(sar) >> SARL_A370_PCLK_FREQ_OPT) &
+			   SARL_A370_PCLK_FREQ_OPT_MASK);
+	if (cpu_freq_select >= ARRAY_SIZE(a370_cpu_freqs)) {
+		pr_err("CPU freq select unsupported %d\n", cpu_freq_select);
+		cpu_freq = 0;
+	} else
+		cpu_freq = a370_cpu_freqs[cpu_freq_select];
+
+	return cpu_freq;
+}
+
+static const int a370_nbclk_ratios[32][2] __initconst = {
+	{0, 1}, {1, 2}, {2, 2}, {2, 2},
+	{1, 2}, {1, 2}, {1, 1}, {2, 3},
+	{0, 1}, {1, 2}, {2, 4}, {0, 1},
+	{1, 2}, {0, 1}, {0, 1}, {2, 2},
+	{0, 1}, {0, 1}, {0, 1}, {1, 1},
+	{2, 3}, {0, 1}, {0, 1}, {0, 1},
+	{0, 1}, {0, 1}, {0, 1}, {1, 1},
+	{0, 1}, {0, 1}, {0, 1}, {0, 1},
+};
+
+static const int a370_hclk_ratios[32][2] __initconst = {
+	{0, 1}, {1, 2}, {2, 6}, {2, 3},
+	{1, 3}, {1, 4}, {1, 2}, {2, 6},
+	{0, 1}, {1, 6}, {2, 10}, {0, 1},
+	{1, 4}, {0, 1}, {0, 1}, {2, 5},
+	{0, 1}, {0, 1}, {0, 1}, {1, 2},
+	{2, 6}, {0, 1}, {0, 1}, {0, 1},
+	{0, 1}, {0, 1}, {0, 1}, {1, 1},
+	{0, 1}, {0, 1}, {0, 1}, {0, 1},
+};
+
+static const int a370_dramclk_ratios[32][2] __initconst = {
+	{0, 1}, {1, 2}, {2, 3}, {2, 3},
+	{1, 3}, {1, 2}, {1, 2}, {2, 6},
+	{0, 1}, {1, 3}, {2, 5}, {0, 1},
+	{1, 4}, {0, 1}, {0, 1}, {2, 5},
+	{0, 1}, {0, 1}, {0, 1}, {1, 1},
+	{2, 3}, {0, 1}, {0, 1}, {0, 1},
+	{0, 1}, {0, 1}, {0, 1}, {1, 1},
+	{0, 1}, {0, 1}, {0, 1}, {0, 1},
+};
+
+static void __init a370_get_clk_ratio(
+	void __iomem *sar, int id, int *mult, int *div)
+{
+	u32 opt = ((readl(sar) >> SARL_A370_FAB_FREQ_OPT) &
+		SARL_A370_FAB_FREQ_OPT_MASK);
+
+	switch (id) {
+	case A370_CPU_TO_NBCLK:
+		*mult = a370_nbclk_ratios[opt][0];
+		*div = a370_nbclk_ratios[opt][1];
+		break;
+	case A370_CPU_TO_HCLK:
+		*mult = a370_hclk_ratios[opt][0];
+		*div = a370_hclk_ratios[opt][1];
+		break;
+	case A370_CPU_TO_DRAMCLK:
+		*mult = a370_dramclk_ratios[opt][0];
+		*div = a370_dramclk_ratios[opt][1];
+		break;
+	}
+}
+
+static bool a370_is_sscg_enabled(void __iomem *sar)
+{
+	return !(readl(sar) & SARL_A370_SSCG_ENABLE);
+}
+
+static const struct coreclk_soc_desc a370_coreclks = {
+	.get_tclk_freq = a370_get_tclk_freq,
+	.get_cpu_freq = a370_get_cpu_freq,
+	.get_clk_ratio = a370_get_clk_ratio,
+	.is_sscg_enabled = a370_is_sscg_enabled,
+	.fix_sscg_deviation = kirkwood_fix_sscg_deviation,
+	.ratios = a370_coreclk_ratios,
+	.num_ratios = ARRAY_SIZE(a370_coreclk_ratios),
+};
+
+/*
+ * Clock Gating Control
+ */
+
+static const struct clk_gating_soc_desc a370_gating_desc[] __initconst = {
+	{ "audio", NULL, 0, 0 },
+	{ "pex0_en", NULL, 1, 0 },
+	{ "pex1_en", NULL,  2, 0 },
+	{ "ge1", NULL, 3, 0 },
+	{ "ge0", NULL, 4, 0 },
+	{ "pex0", "pex0_en", 5, 0 },
+	{ "pex1", "pex1_en", 9, 0 },
+	{ "sata0", NULL, 15, 0 },
+	{ "sdio", NULL, 17, 0 },
+	{ "tdm", NULL, 25, 0 },
+	{ "ddr", NULL, 28, CLK_IGNORE_UNUSED },
+	{ "sata1", NULL, 30, 0 },
+	{ }
+};
+
+static void __init a370_clk_init(struct device_node *np)
+{
+	struct device_node *cgnp =
+		of_find_compatible_node(NULL, NULL, "marvell,armada-370-gating-clock");
+
+	mvebu_coreclk_setup(np, &a370_coreclks);
+
+	if (cgnp)
+		mvebu_clk_gating_setup(cgnp, a370_gating_desc);
+}
+CLK_OF_DECLARE(a370_clk, "marvell,armada-370-core-clock", a370_clk_init);
+