clk: mvebu: add Armada 370 SoC-centric clock init

This is moving core clock and clock gating init for Armada 370 to
its own file and adds a Kconfig option. Also init functions are added
and declared so they get called on of_clk_init.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

3 files changed, 182 insertions, 0 deletions

diff --git a/drivers/clk/mvebu/Kconfig b/drivers/clk/mvebu/Kconfig
index 211695cd4db8..1daf61ee5791 100644
--- a/drivers/clk/mvebu/Kconfig
+++ b/drivers/clk/mvebu/Kconfig
@@ -10,6 +10,11 @@ config MVEBU_CLK_GATING
 config MVEBU_CLK_COMMON
         bool
 
+config ARMADA_370_CLK
+        bool
+        select MVEBU_CLK_COMMON
+        select MVEBU_CLK_CPU
+
 config DOVE_CLK
         bool
         select MVEBU_CLK_COMMON
diff --git a/drivers/clk/mvebu/Makefile b/drivers/clk/mvebu/Makefile
index 97d1ab02f014..367b72c4630d 100644
--- a/drivers/clk/mvebu/Makefile
+++ b/drivers/clk/mvebu/Makefile
@@ -3,5 +3,6 @@ obj-$(CONFIG_MVEBU_CLK_CORE) 	+= clk.o clk-core.o
 obj-$(CONFIG_MVEBU_CLK_CPU)     += clk-cpu.o
 obj-$(CONFIG_MVEBU_CLK_GATING)  += clk-gating-ctrl.o
 
+obj-$(CONFIG_ARMADA_370_CLK)    += armada-370.o
 obj-$(CONFIG_DOVE_CLK)          += dove.o
 obj-$(CONFIG_KIRKWOOD_CLK)      += kirkwood.o
diff --git a/drivers/clk/mvebu/armada-370.c b/drivers/clk/mvebu/armada-370.c
new file mode 100644
index 000000000000..079960e7c304
--- /dev/null
+++ b/drivers/clk/mvebu/armada-370.c
@@ -0,0 +1,176 @@
+/*
+ * 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_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 __initconst a370_coreclk_ratios[] = {
+        { .id = A370_CPU_TO_NBCLK, .name = "nbclk" },
+        { .id = A370_CPU_TO_HCLK, .name = "hclk" },
+        { .id = A370_CPU_TO_DRAMCLK, .name = "dramclk" },
+};
+
+static const u32 __initconst a370_tclk_freqs[] = {
+        16600000,
+        20000000,
+};
+
+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 __initconst a370_cpu_freqs[] = {
+        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 __initconst a370_nbclk_ratios[32][2] = {
+        {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 __initconst a370_hclk_ratios[32][2] = {
+        {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 __initconst a370_dramclk_ratios[32][2] = {
+        {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 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,
+        .ratios = a370_coreclk_ratios,
+        .num_ratios = ARRAY_SIZE(a370_coreclk_ratios),
+};
+
+static void __init a370_coreclk_init(struct device_node *np)
+{
+        mvebu_coreclk_setup(np, &a370_coreclks);
+}
+CLK_OF_DECLARE(a370_core_clk, "marvell,armada-370-core-clock",
+               a370_coreclk_init);
+
+/*
+ * Clock Gating Control
+ */
+
+static const struct clk_gating_soc_desc __initconst a370_gating_desc[] = {
+        { "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_gating_init(struct device_node *np)
+{
+        mvebu_clk_gating_setup(np, a370_gating_desc);
+}
+CLK_OF_DECLARE(a370_clk_gating, "marvell,armada-370-gating-clock",
+               a370_clk_gating_init);