[PATCH 5/6] clk: emev2: Add support for emev2 SMU clocks with DT
From: takasi-y
Date: Tue Sep 24 2013 - 00:16:12 EST
Common clock framework version of emev2 clock support.
smu_clkdiv and smu_gclk are handled.
So far, reparent is not implemented, and is fixed to index #0.
SMU and small numbers of clocks are described in emev2.dtsi.
That function and numbers of clocks are equivalent to current
sh-clkfwk version. It is just enough to run kzm9d-reference.
Signed-off-by: Takashi Yoshii <takashi.yoshii.zj@xxxxxxxxxxx>
---
arch/arm/boot/dts/emev2.dtsi | 84 +++++++++++++++++++++++++++++++
drivers/clk/Makefile | 2 +
drivers/clk/shmobile/Makefile | 5 ++
drivers/clk/shmobile/clk-emev2.c | 104 +++++++++++++++++++++++++++++++++++++++
4 files changed, 195 insertions(+)
create mode 100644 drivers/clk/shmobile/Makefile
create mode 100644 drivers/clk/shmobile/clk-emev2.c
diff --git a/arch/arm/boot/dts/emev2.dtsi b/arch/arm/boot/dts/emev2.dtsi
index 9063a44..c6a4767 100644
--- a/arch/arm/boot/dts/emev2.dtsi
+++ b/arch/arm/boot/dts/emev2.dtsi
@@ -52,34 +52,118 @@
<0 121 4>;
};
+ smu {
+ compatible = "renesas,emev2-smu";
+ reg = <0xe0110000 0x10000>;
+ #address-cells = <2>;
+ #size-cells = <0>;
+
+ c32ki: c32ki {
+ compatible = "fixed-clock";
+ clock-frequency = <32768>;
+ #clock-cells = <0>;
+ };
+ pll3_fo: pll3_fo {
+ compatible = "fixed-factor-clock";
+ clocks = <&c32ki>;
+ clock-div = <1>;
+ clock-mult = <7000>;
+ #clock-cells = <0>;
+ };
+ usia_u0_sclkdiv: usia_u0_sclkdiv {
+ compatible = "renesas,emev2-smu-clkdiv";
+ reg = <0x610 0>;
+ clocks = <&pll3_fo>;
+ #clock-cells = <0>;
+ };
+ usib_u1_sclkdiv: usib_u1_sclkdiv {
+ compatible = "renesas,emev2-smu-clkdiv";
+ reg = <0x65c 0>;
+ clocks = <&pll3_fo>;
+ #clock-cells = <0>;
+ };
+ usib_u2_sclkdiv: usib_u2_sclkdiv {
+ compatible = "renesas,emev2-smu-clkdiv";
+ reg = <0x65c 16>;
+ clocks = <&pll3_fo>;
+ #clock-cells = <0>;
+ };
+ usib_u3_sclkdiv: usib_u3_sclkdiv {
+ compatible = "renesas,emev2-smu-clkdiv";
+ reg = <0x660 0>;
+ clocks = <&pll3_fo>;
+ #clock-cells = <0>;
+ };
+ usia_u0_sclk: usia_u0_sclk {
+ compatible = "renesas,emev2-smu-gclk";
+ reg = <0x4a0 1>;
+ clocks = <&usia_u0_sclkdiv>;
+ #clock-cells = <0>;
+ };
+ usib_u1_sclk: usib_u1_sclk {
+ compatible = "renesas,emev2-smu-gclk";
+ reg = <0x4b8 1>;
+ clocks = <&usib_u1_sclkdiv>;
+ #clock-cells = <0>;
+ };
+ usib_u2_sclk: usib_u2_sclk {
+ compatible = "renesas,emev2-smu-gclk";
+ reg = <0x4bc 1>;
+ clocks = <&usib_u2_sclkdiv>;
+ #clock-cells = <0>;
+ };
+ usib_u3_sclk: usib_u3_sclk {
+ compatible = "renesas,emev2-smu-gclk";
+ reg = <0x4c0 1>;
+ clocks = <&usib_u3_sclkdiv>;
+ #clock-cells = <0>;
+ };
+ sti_sclk: sti_sclk {
+ compatible = "renesas,emev2-smu-gclk";
+ reg = <0x528 1>;
+ clocks = <&c32ki>;
+ #clock-cells = <0>;
+ };
+ };
+
sti@e0180000 {
compatible = "renesas,em-sti";
reg = <0xe0180000 0x54>;
interrupts = <0 125 0>;
+ clocks = <&sti_sclk>;
+ clock-names = "sclk";
};
uart@e1020000 {
compatible = "renesas,em-uart";
reg = <0xe1020000 0x38>;
interrupts = <0 8 0>;
+ clocks = <&usia_u0_sclk>;
+ clock-names = "sclk";
};
uart@e1030000 {
compatible = "renesas,em-uart";
reg = <0xe1030000 0x38>;
interrupts = <0 9 0>;
+ clocks = <&usib_u1_sclk>;
+ clock-names = "sclk";
};
uart@e1040000 {
compatible = "renesas,em-uart";
reg = <0xe1040000 0x38>;
interrupts = <0 10 0>;
+ clocks = <&usib_u2_sclk>;
+ clock-names = "sclk";
};
uart@e1050000 {
compatible = "renesas,em-uart";
reg = <0xe1050000 0x38>;
interrupts = <0 11 0>;
+ clocks = <&usib_u3_sclk>;
+ clock-names = "sclk";
};
gpio0: gpio@e0050000 {
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 7b11106..3e64ac4 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -32,6 +32,8 @@ obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
obj-$(CONFIG_ARCH_ZYNQ) += zynq/
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_PLAT_SAMSUNG) += samsung/
+obj-$(CONFIG_ARCH_SHMOBILE) += shmobile/
+obj-$(CONFIG_ARCH_SHMOBILE_MULTI) += shmobile/
obj-$(CONFIG_X86) += x86/
diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile
new file mode 100644
index 0000000..6a26eb6
--- /dev/null
+++ b/drivers/clk/shmobile/Makefile
@@ -0,0 +1,5 @@
+ifeq ($(CONFIG_COMMON_CLK), y)
+obj-$(CONFIG_ARCH_EMEV2) += clk-emev2.o
+endif
+# for emply built-in.o
+obj-n := dummy
diff --git a/drivers/clk/shmobile/clk-emev2.c b/drivers/clk/shmobile/clk-emev2.c
new file mode 100644
index 0000000..6c7c929
--- /dev/null
+++ b/drivers/clk/shmobile/clk-emev2.c
@@ -0,0 +1,104 @@
+/*
+ * EMMA Mobile EV2 common clock framework support
+ *
+ * Copyright (C) 2013 Takashi Yoshii <takashi.yoshii.ze@xxxxxxxxxxx>
+ * Copyright (C) 2012 Magnus Damm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+/* EMEV2 SMU registers */
+#define USIAU0_RSTCTRL 0x094
+#define USIBU1_RSTCTRL 0x0ac
+#define USIBU2_RSTCTRL 0x0b0
+#define USIBU3_RSTCTRL 0x0b4
+#define STI_RSTCTRL 0x124
+#define STI_CLKSEL 0x688
+
+static DEFINE_SPINLOCK(lock);
+
+/* not pretty, but hey */
+void __iomem *smu_base;
+
+static void __init emev2_smu_write(unsigned long value, int offs)
+{
+ BUG_ON(!smu_base || (offs >= PAGE_SIZE));
+ writel_relaxed(value, smu_base + offs);
+}
+
+static const struct of_device_id smu_id[] __initconst = {
+ { .compatible = "renesas,emev2-smu", },
+ {},
+};
+
+static void __init emev2_smu_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_matching_node(NULL, smu_id);
+ BUG_ON(!np);
+ smu_base = of_iomap(np, 0);
+ BUG_ON(!smu_base);
+ of_node_put(np);
+
+ /* setup STI timer to run on 32.768 kHz and deassert reset */
+ emev2_smu_write(0, STI_CLKSEL);
+ emev2_smu_write(1, STI_RSTCTRL);
+
+ /* deassert reset for UART0->UART3 */
+ emev2_smu_write(2, USIAU0_RSTCTRL);
+ emev2_smu_write(2, USIBU1_RSTCTRL);
+ emev2_smu_write(2, USIBU2_RSTCTRL);
+ emev2_smu_write(2, USIBU3_RSTCTRL);
+}
+
+static void __init emev2_smu_clkdiv_init(struct device_node *np)
+{
+ u32 reg[2];
+ struct clk *clk;
+ const char *parent_name = of_clk_get_parent_name(np, 0);
+ if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2)))
+ return;
+ if (!smu_base)
+ emev2_smu_init();
+ clk = clk_register_divider(NULL, np->name, parent_name, 0,
+ smu_base + reg[0], reg[1], 8, 0, &lock);
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ clk_register_clkdev(clk, np->name, NULL);
+ pr_debug("## %s %s %p\n", __func__, np->name, clk);
+}
+CLK_OF_DECLARE(emev2_smu_clkdiv, "renesas,emev2-smu-clkdiv",
+ emev2_smu_clkdiv_init);
+
+static void __init emev2_smu_gclk_init(struct device_node *np)
+{
+ u32 reg[2];
+ struct clk *clk;
+ const char *parent_name = of_clk_get_parent_name(np, 0);
+ if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2)))
+ return;
+ if (!smu_base)
+ emev2_smu_init();
+ clk = clk_register_gate(NULL, np->name, parent_name, 0,
+ smu_base + reg[0], reg[1], 0, &lock);
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ clk_register_clkdev(clk, np->name, NULL);
+ pr_debug("## %s %s %p\n", __func__, np->name, clk);
+}
+CLK_OF_DECLARE(emev2_smu_gclk, "renesas,emev2-smu-gclk", emev2_smu_gclk_init);
--
1.8.1.5
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