clk: mvebu: add Orion5x clock driver

This commit adds a core clock driver for the Orion5x SoC, with support
for the tclk, the CPU frequency and the DDR frequency. All the details
about the Sample-At-Reset register were extracted from the U-Boot
sources for Orion5x.

Note that Orion5x does not have gatable clocks, so this core clock
driver is sufficient to support clocking on Orion5x platforms.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: https://lkml.kernel.org/r/1398202002-28530-5-git-send-email-thomas.petazzoni@free-electrons.com
Cc: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt b/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt
index 307a503c5db882cc600710aae58381ea131977ae..dc5ea5b22da90dbf43f0d5e15b28141d3c7e0e4d 100644 (file)
--- a/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt
+++ b/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt
@@ -29,6 +29,11 @@ The following is a list of provided IDs and clock names on Kirkwood and Dove:
  2 = l2clk  (L2 Cache clock derived from CPU0 clock)
  3 = ddrclk (DDR controller clock derived from CPU0 clock)
 
+The following is a list of provided IDs and clock names on Orion5x:
+ 0 = tclk   (Internal Bus clock)
+ 1 = cpuclk (CPU0 clock)
+ 2 = ddrclk (DDR controller clock derived from CPU0 clock)
+
 Required properties:
 - compatible : shall be one of the following:
        "marvell,armada-370-core-clock" - For Armada 370 SoC core clocks
@@ -38,6 +43,9 @@ Required properties:
        "marvell,dove-core-clock" - for Dove SoC core clocks
        "marvell,kirkwood-core-clock" - for Kirkwood SoC (except mv88f6180)
        "marvell,mv88f6180-core-clock" - for Kirkwood MV88f6180 SoC
+       "marvell,mv88f5182-core-clock" - for Orion MV88F5182 SoC
+       "marvell,mv88f5281-core-clock" - for Orion MV88F5281 SoC
+       "marvell,mv88f6183-core-clock" - for Orion MV88F6183 SoC
 - reg : shall be the register address of the Sample-At-Reset (SAR) register
 - #clock-cells : from common clock binding; shall be set to 1
 

diff --git a/drivers/clk/mvebu/Kconfig b/drivers/clk/mvebu/Kconfig
index 693f7be129f12a0d159727c33cd126e68cf957e0..3b34dba9178d9c792fffa5f5afa5b2c0e00d83dd 100644 (file)
--- a/drivers/clk/mvebu/Kconfig
+++ b/drivers/clk/mvebu/Kconfig
@@ -34,3 +34,7 @@ config DOVE_CLK
 config KIRKWOOD_CLK
        bool
        select MVEBU_CLK_COMMON
+
+config ORION_CLK
+       bool
+       select MVEBU_CLK_COMMON

diff --git a/drivers/clk/mvebu/Makefile b/drivers/clk/mvebu/Makefile
index 4c66162fb0b440ca326f3f5b1510f71dbf3b755f..a9a56fc01901580f36804efb6d21968cf7d749f0 100644 (file)
--- a/drivers/clk/mvebu/Makefile
+++ b/drivers/clk/mvebu/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_ARMADA_38X_CLK)    += armada-38x.o
 obj-$(CONFIG_ARMADA_XP_CLK)    += armada-xp.o
 obj-$(CONFIG_DOVE_CLK)         += dove.o
 obj-$(CONFIG_KIRKWOOD_CLK)     += kirkwood.o
+obj-$(CONFIG_ORION_CLK)                += orion.o

diff --git a/drivers/clk/mvebu/orion.c b/drivers/clk/mvebu/orion.c
new file mode 100644 (file)
index 0000000..fd12956
--- /dev/null
+++ b/drivers/clk/mvebu/orion.c
@@ -0,0 +1,210 @@
+/*
+ * Marvell Orion SoC clocks
+ *
+ * Copyright (C) 2014 Thomas Petazzoni
+ *
+ * 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"
+
+static const struct coreclk_ratio orion_coreclk_ratios[] __initconst = {
+       { .id = 0, .name = "ddrclk", }
+};
+
+/*
+ * Orion 5182
+ */
+
+#define SAR_MV88F5182_TCLK_FREQ      8
+#define SAR_MV88F5182_TCLK_FREQ_MASK 0x3
+
+static u32 __init mv88f5182_get_tclk_freq(void __iomem *sar)
+{
+       u32 opt = (readl(sar) >> SAR_MV88F5182_TCLK_FREQ) &
+               SAR_MV88F5182_TCLK_FREQ_MASK;
+       if (opt == 1)
+               return 150000000;
+       else if (opt == 2)
+               return 166666667;
+       else
+               return 0;
+}
+
+#define SAR_MV88F5182_CPU_FREQ       4
+#define SAR_MV88F5182_CPU_FREQ_MASK  0xf
+
+static u32 __init mv88f5182_get_cpu_freq(void __iomem *sar)
+{
+       u32 opt = (readl(sar) >> SAR_MV88F5182_CPU_FREQ) &
+               SAR_MV88F5182_CPU_FREQ_MASK;
+       if (opt == 0)
+               return 333333333;
+       else if (opt == 1 || opt == 2)
+               return 400000000;
+       else if (opt == 3)
+               return 500000000;
+       else
+               return 0;
+}
+
+static void __init mv88f5182_get_clk_ratio(void __iomem *sar, int id,
+                                          int *mult, int *div)
+{
+       u32 opt = (readl(sar) >> SAR_MV88F5182_CPU_FREQ) &
+               SAR_MV88F5182_CPU_FREQ_MASK;
+       if (opt == 0 || opt == 1) {
+               *mult = 1;
+               *div  = 2;
+       } else if (opt == 2 || opt == 3) {
+               *mult = 1;
+               *div  = 3;
+       } else {
+               *mult = 0;
+               *div  = 1;
+       }
+}
+
+static const struct coreclk_soc_desc mv88f5182_coreclks = {
+       .get_tclk_freq = mv88f5182_get_tclk_freq,
+       .get_cpu_freq = mv88f5182_get_cpu_freq,
+       .get_clk_ratio = mv88f5182_get_clk_ratio,
+       .ratios = orion_coreclk_ratios,
+       .num_ratios = ARRAY_SIZE(orion_coreclk_ratios),
+};
+
+static void __init mv88f5182_clk_init(struct device_node *np)
+{
+       return mvebu_coreclk_setup(np, &mv88f5182_coreclks);
+}
+
+CLK_OF_DECLARE(mv88f5182_clk, "marvell,mv88f5182-core-clock", mv88f5182_clk_init);
+
+/*
+ * Orion 5281
+ */
+
+static u32 __init mv88f5281_get_tclk_freq(void __iomem *sar)
+{
+       /* On 5281, tclk is always 166 Mhz */
+       return 166666667;
+}
+
+#define SAR_MV88F5281_CPU_FREQ       4
+#define SAR_MV88F5281_CPU_FREQ_MASK  0xf
+
+static u32 __init mv88f5281_get_cpu_freq(void __iomem *sar)
+{
+       u32 opt = (readl(sar) >> SAR_MV88F5281_CPU_FREQ) &
+               SAR_MV88F5281_CPU_FREQ_MASK;
+       if (opt == 1 || opt == 2)
+               return 400000000;
+       else if (opt == 3)
+               return 500000000;
+       else
+               return 0;
+}
+
+static void __init mv88f5281_get_clk_ratio(void __iomem *sar, int id,
+                                          int *mult, int *div)
+{
+       u32 opt = (readl(sar) >> SAR_MV88F5281_CPU_FREQ) &
+               SAR_MV88F5281_CPU_FREQ_MASK;
+       if (opt == 1) {
+               *mult = 1;
+               *div = 2;
+       } else if (opt == 2 || opt == 3) {
+               *mult = 1;
+               *div = 3;
+       } else {
+               *mult = 0;
+               *div = 1;
+       }
+}
+
+static const struct coreclk_soc_desc mv88f5281_coreclks = {
+       .get_tclk_freq = mv88f5281_get_tclk_freq,
+       .get_cpu_freq = mv88f5281_get_cpu_freq,
+       .get_clk_ratio = mv88f5281_get_clk_ratio,
+       .ratios = orion_coreclk_ratios,
+       .num_ratios = ARRAY_SIZE(orion_coreclk_ratios),
+};
+
+static void __init mv88f5281_clk_init(struct device_node *np)
+{
+       return mvebu_coreclk_setup(np, &mv88f5281_coreclks);
+}
+
+CLK_OF_DECLARE(mv88f5281_clk, "marvell,mv88f5281-core-clock", mv88f5281_clk_init);
+
+/*
+ * Orion 6183
+ */
+
+#define SAR_MV88F6183_TCLK_FREQ      9
+#define SAR_MV88F6183_TCLK_FREQ_MASK 0x1
+
+static u32 __init mv88f6183_get_tclk_freq(void __iomem *sar)
+{
+       u32 opt = (readl(sar) >> SAR_MV88F6183_TCLK_FREQ) &
+               SAR_MV88F6183_TCLK_FREQ_MASK;
+       if (opt == 0)
+               return 133333333;
+       else if (opt == 1)
+               return 166666667;
+       else
+               return 0;
+}
+
+#define SAR_MV88F6183_CPU_FREQ       1
+#define SAR_MV88F6183_CPU_FREQ_MASK  0x3f
+
+static u32 __init mv88f6183_get_cpu_freq(void __iomem *sar)
+{
+       u32 opt = (readl(sar) >> SAR_MV88F6183_CPU_FREQ) &
+               SAR_MV88F6183_CPU_FREQ_MASK;
+       if (opt == 9)
+               return 333333333;
+       else if (opt == 17)
+               return 400000000;
+       else
+               return 0;
+}
+
+static void __init mv88f6183_get_clk_ratio(void __iomem *sar, int id,
+                                          int *mult, int *div)
+{
+       u32 opt = (readl(sar) >> SAR_MV88F6183_CPU_FREQ) &
+               SAR_MV88F6183_CPU_FREQ_MASK;
+       if (opt == 9 || opt == 17) {
+               *mult = 1;
+               *div  = 2;
+       } else {
+               *mult = 0;
+               *div  = 1;
+       }
+}
+
+static const struct coreclk_soc_desc mv88f6183_coreclks = {
+       .get_tclk_freq = mv88f6183_get_tclk_freq,
+       .get_cpu_freq = mv88f6183_get_cpu_freq,
+       .get_clk_ratio = mv88f6183_get_clk_ratio,
+       .ratios = orion_coreclk_ratios,
+       .num_ratios = ARRAY_SIZE(orion_coreclk_ratios),
+};
+
+
+static void __init mv88f6183_clk_init(struct device_node *np)
+{
+       return mvebu_coreclk_setup(np, &mv88f6183_coreclks);
+}
+
+CLK_OF_DECLARE(mv88f6183_clk, "marvell,mv88f6183-core-clock", mv88f6183_clk_init);