diff options
| -rw-r--r-- | Documentation/devicetree/bindings/clock/exynos5440-clock.txt | 61 | ||||
| -rw-r--r-- | drivers/clk/samsung/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clk/samsung/clk-exynos5440.c | 139 |
3 files changed, 201 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/clock/exynos5440-clock.txt b/Documentation/devicetree/bindings/clock/exynos5440-clock.txt new file mode 100644 index 0000000..4499e99 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/exynos5440-clock.txt @@ -0,0 +1,61 @@ +* Samsung Exynos5440 Clock Controller + +The Exynos5440 clock controller generates and supplies clock to various +controllers within the Exynos5440 SoC. + +Required Properties: + +- comptible: should be "samsung,exynos5440-clock". + +- reg: physical base address of the controller and length of memory mapped + region. + +- #clock-cells: should be 1. + +The following is the list of clocks generated by the controller. Each clock is +assigned an identifier and client nodes use this identifier to specify the +clock which they consume. + + + [Core Clocks] + + Clock ID + ---------------------------- + + xtal 1 + arm_clk 2 + + [Peripheral Clock Gates] + + Clock ID + ---------------------------- + + spi_baud 16 + pb0_250 17 + pr0_250 18 + pr1_250 19 + b_250 20 + b_125 21 + b_200 22 + sata 23 + usb 24 + gmac0 25 + cs250 26 + pb0_250_o 27 + pr0_250_o 28 + pr1_250_o 29 + b_250_o 30 + b_125_o 31 + b_200_o 32 + sata_o 33 + usb_o 34 + gmac0_o 35 + cs250_o 36 + +Example: An example of a clock controller node is listed below. + + clock: clock-controller@0x10010000 { + compatible = "samsung,exynos5440-clock"; + reg = <0x160000 0x10000>; + #clock-cells = <1>; + }; diff --git a/drivers/clk/samsung/Makefile b/drivers/clk/samsung/Makefile index f18fb07..b7c232e 100644 --- a/drivers/clk/samsung/Makefile +++ b/drivers/clk/samsung/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_COMMON_CLK) += clk.o clk-pll.o obj-$(CONFIG_ARCH_EXYNOS4) += clk-exynos4.o obj-$(CONFIG_SOC_EXYNOS5250) += clk-exynos5250.o +obj-$(CONFIG_SOC_EXYNOS5440) += clk-exynos5440.o diff --git a/drivers/clk/samsung/clk-exynos5440.c b/drivers/clk/samsung/clk-exynos5440.c new file mode 100644 index 0000000..d588e93 --- /dev/null +++ b/drivers/clk/samsung/clk-exynos5440.c @@ -0,0 +1,139 @@ +/* + * Copyright (c) 2013 Samsung Electronics Co., Ltd. + * Author: Thomas Abraham <thomas.ab@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Common Clock Framework support for Exynos5440 SoC. +*/ + +#include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/clk-provider.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#include <plat/cpu.h> +#include "clk.h" +#include "clk-pll.h" + +#define CLKEN_OV_VAL 0xf8 +#define CPU_CLK_STATUS 0xfc +#define MISC_DOUT1 0x558 + +/* + * Let each supported clock get a unique id. This id is used to lookup the clock + * for device tree based platforms. + */ +enum exynos5440_clks { + none, xtal, arm_clk, + + spi_baud = 16, pb0_250, pr0_250, pr1_250, b_250, b_125, b_200, sata, + usb, gmac0, cs250, pb0_250_o, pr0_250_o, pr1_250_o, b_250_o, b_125_o, + b_200_o, sata_o, usb_o, gmac0_o, cs250_o, + + nr_clks, +}; + +/* parent clock name list */ +PNAME(mout_armclk_p) = { "cplla", "cpllb" }; +PNAME(mout_spi_p) = { "div125", "div200" }; + +/* fixed rate clocks generated outside the soc */ +struct samsung_fixed_rate_clock exynos5440_fixed_rate_ext_clks[] __initdata = { + FRATE(none, "xtal", NULL, CLK_IS_ROOT, 0), +}; + +/* fixed rate clocks */ +struct samsung_fixed_rate_clock exynos5440_fixed_rate_clks[] __initdata = { + FRATE(none, "ppll", NULL, CLK_IS_ROOT, 1000000000), + FRATE(none, "usb_phy0", NULL, CLK_IS_ROOT, 60000000), + FRATE(none, "usb_phy1", NULL, CLK_IS_ROOT, 60000000), + FRATE(none, "usb_ohci12", NULL, CLK_IS_ROOT, 12000000), + FRATE(none, "usb_ohci48", NULL, CLK_IS_ROOT, 48000000), +}; + +/* fixed factor clocks */ +struct samsung_fixed_factor_clock exynos5440_fixed_factor_clks[] __initdata = { + FFACTOR(none, "div250", "ppll", 1, 4, 0), + FFACTOR(none, "div200", "ppll", 1, 5, 0), + FFACTOR(none, "div125", "div250", 1, 2, 0), +}; + +/* mux clocks */ +struct samsung_mux_clock exynos5440_mux_clks[] __initdata = { + MUX(none, "mout_spi", mout_spi_p, MISC_DOUT1, 5, 1), + MUX_A(arm_clk, "arm_clk", mout_armclk_p, + CPU_CLK_STATUS, 0, 1, "armclk"), +}; + +/* divider clocks */ +struct samsung_div_clock exynos5440_div_clks[] __initdata = { + DIV(spi_baud, "div_spi", "mout_spi", MISC_DOUT1, 3, 2), +}; + +/* gate clocks */ +struct samsung_gate_clock exynos5440_gate_clks[] __initdata = { + GATE(pb0_250, "pb0_250", "div250", CLKEN_OV_VAL, 3, 0, 0), + GATE(pr0_250, "pr0_250", "div250", CLKEN_OV_VAL, 4, 0, 0), + GATE(pr1_250, "pr1_250", "div250", CLKEN_OV_VAL, 5, 0, 0), + GATE(b_250, "b_250", "div250", CLKEN_OV_VAL, 9, 0, 0), + GATE(b_125, "b_125", "div125", CLKEN_OV_VAL, 10, 0, 0), + GATE(b_200, "b_200", "div200", CLKEN_OV_VAL, 11, 0, 0), + GATE(sata, "sata", "div200", CLKEN_OV_VAL, 12, 0, 0), + GATE(usb, "usb", "div200", CLKEN_OV_VAL, 13, 0, 0), + GATE(gmac0, "gmac0", "div200", CLKEN_OV_VAL, 14, 0, 0), + GATE(cs250, "cs250", "div250", CLKEN_OV_VAL, 19, 0, 0), + GATE(pb0_250_o, "pb0_250_o", "pb0_250", CLKEN_OV_VAL, 3, 0, 0), + GATE(pr0_250_o, "pr0_250_o", "pr0_250", CLKEN_OV_VAL, 4, 0, 0), + GATE(pr1_250_o, "pr1_250_o", "pr1_250", CLKEN_OV_VAL, 5, 0, 0), + GATE(b_250_o, "b_250_o", "b_250", CLKEN_OV_VAL, 9, 0, 0), + GATE(b_125_o, "b_125_o", "b_125", CLKEN_OV_VAL, 10, 0, 0), + GATE(b_200_o, "b_200_o", "b_200", CLKEN_OV_VAL, 11, 0, 0), + GATE(sata_o, "sata_o", "sata", CLKEN_OV_VAL, 12, 0, 0), + GATE(usb_o, "usb_o", "usb", CLKEN_OV_VAL, 13, 0, 0), + GATE(gmac0_o, "gmac0_o", "gmac", CLKEN_OV_VAL, 14, 0, 0), + GATE(cs250_o, "cs250_o", "cs250", CLKEN_OV_VAL, 19, 0, 0), +}; + +static __initdata struct of_device_id ext_clk_match[] = { + { .compatible = "samsung,clock-xtal", .data = (void *)0, }, + {}, +}; + +/* register exynos5440 clocks */ +void __init exynos5440_clk_init(struct device_node *np) +{ + void __iomem *reg_base; + + reg_base = of_iomap(np, 0); + if (!reg_base) { + pr_err("%s: failed to map clock controller registers," + " aborting clock initialization\n", __func__); + return; + } + + samsung_clk_init(np, reg_base, nr_clks, NULL, 0); + samsung_clk_of_register_fixed_ext(exynos5440_fixed_rate_ext_clks, + ARRAY_SIZE(exynos5440_fixed_rate_ext_clks), ext_clk_match); + + samsung_clk_register_pll2550x("cplla", "xtal", reg_base + 0x1c, 0x10); + samsung_clk_register_pll2550x("cpllb", "xtal", reg_base + 0x20, 0x10); + + samsung_clk_register_fixed_rate(exynos5440_fixed_rate_clks, + ARRAY_SIZE(exynos5440_fixed_rate_clks)); + samsung_clk_register_fixed_factor(exynos5440_fixed_factor_clks, + ARRAY_SIZE(exynos5440_fixed_factor_clks)); + samsung_clk_register_mux(exynos5440_mux_clks, + ARRAY_SIZE(exynos5440_mux_clks)); + samsung_clk_register_div(exynos5440_div_clks, + ARRAY_SIZE(exynos5440_div_clks)); + samsung_clk_register_gate(exynos5440_gate_clks, + ARRAY_SIZE(exynos5440_gate_clks)); + + pr_info("Exynos5440: arm_clk = %ldHz\n", _get_rate("armclk")); + pr_info("exynos5440 clock initialization complete\n"); +} +CLK_OF_DECLARE(exynos5440_clk, "samsung,exynos5440-clock", exynos5440_clk_init); |