diff --git a/Documentation/devicetree/bindings/clock/emev2-clock.txt b/Documentation/devicetree/bindings/clock/emev2-clock.txt new file mode 100644 index 000000000000..60bbb1a8c69a --- /dev/null +++ b/Documentation/devicetree/bindings/clock/emev2-clock.txt @@ -0,0 +1,98 @@ +Device tree Clock bindings for Renesas EMMA Mobile EV2 + +This binding uses the common clock binding. + +* SMU +System Management Unit described in user's manual R19UH0037EJ1000_SMU. +This is not a clock provider, but clocks under SMU depend on it. + +Required properties: +- compatible: Should be "renesas,emev2-smu" +- reg: Address and Size of SMU registers + +* SMU_CLKDIV +Function block with an input mux and a divider, which corresponds to +"Serial clock generator" in fig."Clock System Overview" of the manual, +and "xxx frequency division setting register" (XXXCLKDIV) registers. +This makes internal (neither input nor output) clock that is provided +to input of xxxGCLK block. + +Required properties: +- compatible: Should be "renesas,emev2-smu-clkdiv" +- reg: Byte offset from SMU base and Bit position in the register +- clocks: Parent clocks. Input clocks as described in clock-bindings.txt +- #clock-cells: Should be <0> + +* SMU_GCLK +Clock gating node shown as "Clock stop processing block" in the +fig."Clock System Overview" of the manual. +Registers are "xxx clock gate control register" (XXXGCLKCTRL). + +Required properties: +- compatible: Should be "renesas,emev2-smu-gclk" +- reg: Byte offset from SMU base and Bit position in the register +- clocks: Input clock as described in clock-bindings.txt +- #clock-cells: Should be <0> + +Example of provider: + +usia_u0_sclkdiv: usia_u0_sclkdiv { + compatible = "renesas,emev2-smu-clkdiv"; + reg = <0x610 0>; + clocks = <&pll3_fo>, <&pll4_fo>, <&pll1_fo>, <&osc1_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>; +}; + +Example of consumer: + +uart@e1020000 { + compatible = "renesas,em-uart"; + reg = <0xe1020000 0x38>; + interrupts = <0 8 0>; + clocks = <&usia_u0_sclk>; + clock-names = "sclk"; +}; + +Example of clock-tree description: + + This describes a clock path in the clock tree + c32ki -> pll3_fo -> usia_u0_sclkdiv -> usia_u0_sclk + +smu@e0110000 { + 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>; + }; + usia_u0_sclk: usia_u0_sclk { + compatible = "renesas,emev2-smu-gclk"; + reg = <0x4a0 1>; + clocks = <&usia_u0_sclkdiv>; + #clock-cells = <0>; + }; +}; diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile index 706adc6ae70c..9ecef140dba7 100644 --- a/drivers/clk/shmobile/Makefile +++ b/drivers/clk/shmobile/Makefile @@ -1,7 +1,7 @@ +obj-$(CONFIG_ARCH_EMEV2) += clk-emev2.o obj-$(CONFIG_ARCH_R8A7790) += clk-rcar-gen2.o obj-$(CONFIG_ARCH_R8A7791) += clk-rcar-gen2.o obj-$(CONFIG_ARCH_SHMOBILE_MULTI) += clk-div6.o obj-$(CONFIG_ARCH_SHMOBILE_MULTI) += clk-mstp.o - # 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 000000000000..6c7c929c7765 --- /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 + * 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 +#include +#include +#include +#include + +/* 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);