159 lines
5.5 KiB
C
159 lines
5.5 KiB
C
/*
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* Copyright (c) 2013 Samsung Electronics Co., Ltd.
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* Author: Thomas Abraham <thomas.ab@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Common Clock Framework support for Exynos5440 SoC.
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*/
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#include <dt-bindings/clock/exynos5440.h>
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include "clk.h"
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#include "clk-pll.h"
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#define CLKEN_OV_VAL 0xf8
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#define CPU_CLK_STATUS 0xfc
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#define MISC_DOUT1 0x558
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static void __iomem *reg_base;
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/* parent clock name list */
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PNAME(mout_armclk_p) = { "cplla", "cpllb" };
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PNAME(mout_spi_p) = { "div125", "div200" };
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/* fixed rate clocks generated outside the soc */
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static struct samsung_fixed_rate_clock exynos5440_fixed_rate_ext_clks[] __initdata = {
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FRATE(0, "xtal", NULL, CLK_IS_ROOT, 0),
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};
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/* fixed rate clocks */
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static struct samsung_fixed_rate_clock exynos5440_fixed_rate_clks[] __initdata = {
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FRATE(0, "ppll", NULL, CLK_IS_ROOT, 1000000000),
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FRATE(0, "usb_phy0", NULL, CLK_IS_ROOT, 60000000),
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FRATE(0, "usb_phy1", NULL, CLK_IS_ROOT, 60000000),
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FRATE(0, "usb_ohci12", NULL, CLK_IS_ROOT, 12000000),
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FRATE(0, "usb_ohci48", NULL, CLK_IS_ROOT, 48000000),
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};
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/* fixed factor clocks */
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static struct samsung_fixed_factor_clock exynos5440_fixed_factor_clks[] __initdata = {
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FFACTOR(0, "div250", "ppll", 1, 4, 0),
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FFACTOR(0, "div200", "ppll", 1, 5, 0),
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FFACTOR(0, "div125", "div250", 1, 2, 0),
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};
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/* mux clocks */
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static struct samsung_mux_clock exynos5440_mux_clks[] __initdata = {
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MUX(0, "mout_spi", mout_spi_p, MISC_DOUT1, 5, 1),
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MUX_A(CLK_ARM_CLK, "arm_clk", mout_armclk_p,
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CPU_CLK_STATUS, 0, 1, "armclk"),
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};
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/* divider clocks */
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static struct samsung_div_clock exynos5440_div_clks[] __initdata = {
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DIV(CLK_SPI_BAUD, "div_spi", "mout_spi", MISC_DOUT1, 3, 2),
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};
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/* gate clocks */
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static struct samsung_gate_clock exynos5440_gate_clks[] __initdata = {
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GATE(CLK_PB0_250, "pb0_250", "div250", CLKEN_OV_VAL, 3, 0, 0),
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GATE(CLK_PR0_250, "pr0_250", "div250", CLKEN_OV_VAL, 4, 0, 0),
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GATE(CLK_PR1_250, "pr1_250", "div250", CLKEN_OV_VAL, 5, 0, 0),
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GATE(CLK_B_250, "b_250", "div250", CLKEN_OV_VAL, 9, 0, 0),
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GATE(CLK_B_125, "b_125", "div125", CLKEN_OV_VAL, 10, 0, 0),
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GATE(CLK_B_200, "b_200", "div200", CLKEN_OV_VAL, 11, 0, 0),
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GATE(CLK_SATA, "sata", "div200", CLKEN_OV_VAL, 12, 0, 0),
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GATE(CLK_USB, "usb", "div200", CLKEN_OV_VAL, 13, 0, 0),
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GATE(CLK_GMAC0, "gmac0", "div200", CLKEN_OV_VAL, 14, 0, 0),
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GATE(CLK_CS250, "cs250", "div250", CLKEN_OV_VAL, 19, 0, 0),
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GATE(CLK_PB0_250_O, "pb0_250_o", "pb0_250", CLKEN_OV_VAL, 3, 0, 0),
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GATE(CLK_PR0_250_O, "pr0_250_o", "pr0_250", CLKEN_OV_VAL, 4, 0, 0),
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GATE(CLK_PR1_250_O, "pr1_250_o", "pr1_250", CLKEN_OV_VAL, 5, 0, 0),
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GATE(CLK_B_250_O, "b_250_o", "b_250", CLKEN_OV_VAL, 9, 0, 0),
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GATE(CLK_B_125_O, "b_125_o", "b_125", CLKEN_OV_VAL, 10, 0, 0),
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GATE(CLK_B_200_O, "b_200_o", "b_200", CLKEN_OV_VAL, 11, 0, 0),
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GATE(CLK_SATA_O, "sata_o", "sata", CLKEN_OV_VAL, 12, 0, 0),
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GATE(CLK_USB_O, "usb_o", "usb", CLKEN_OV_VAL, 13, 0, 0),
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GATE(CLK_GMAC0_O, "gmac0_o", "gmac", CLKEN_OV_VAL, 14, 0, 0),
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GATE(CLK_CS250_O, "cs250_o", "cs250", CLKEN_OV_VAL, 19, 0, 0),
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};
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static const struct of_device_id ext_clk_match[] __initconst = {
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{ .compatible = "samsung,clock-xtal", .data = (void *)0, },
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{},
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};
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static int exynos5440_clk_restart_notify(struct notifier_block *this,
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unsigned long code, void *unused)
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{
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u32 val, status;
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status = readl_relaxed(reg_base + 0xbc);
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val = readl_relaxed(reg_base + 0xcc);
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val = (val & 0xffff0000) | (status & 0xffff);
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writel_relaxed(val, reg_base + 0xcc);
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return NOTIFY_DONE;
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}
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/*
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* Exynos5440 Clock restart notifier, handles restart functionality
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*/
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static struct notifier_block exynos5440_clk_restart_handler = {
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.notifier_call = exynos5440_clk_restart_notify,
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.priority = 128,
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};
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/* register exynos5440 clocks */
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static void __init exynos5440_clk_init(struct device_node *np)
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{
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struct samsung_clk_provider *ctx;
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reg_base = of_iomap(np, 0);
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if (!reg_base) {
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pr_err("%s: failed to map clock controller registers,"
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" aborting clock initialization\n", __func__);
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return;
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}
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ctx = samsung_clk_init(np, reg_base, CLK_NR_CLKS);
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if (!ctx)
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panic("%s: unable to allocate context.\n", __func__);
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samsung_clk_of_register_fixed_ext(ctx, exynos5440_fixed_rate_ext_clks,
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ARRAY_SIZE(exynos5440_fixed_rate_ext_clks), ext_clk_match);
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samsung_clk_register_pll2550x("cplla", "xtal", reg_base + 0x1c, 0x10);
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samsung_clk_register_pll2550x("cpllb", "xtal", reg_base + 0x20, 0x10);
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samsung_clk_register_fixed_rate(ctx, exynos5440_fixed_rate_clks,
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ARRAY_SIZE(exynos5440_fixed_rate_clks));
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samsung_clk_register_fixed_factor(ctx, exynos5440_fixed_factor_clks,
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ARRAY_SIZE(exynos5440_fixed_factor_clks));
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samsung_clk_register_mux(ctx, exynos5440_mux_clks,
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ARRAY_SIZE(exynos5440_mux_clks));
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samsung_clk_register_div(ctx, exynos5440_div_clks,
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ARRAY_SIZE(exynos5440_div_clks));
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samsung_clk_register_gate(ctx, exynos5440_gate_clks,
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ARRAY_SIZE(exynos5440_gate_clks));
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samsung_clk_of_add_provider(np, ctx);
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if (register_restart_handler(&exynos5440_clk_restart_handler))
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pr_warn("exynos5440 clock can't register restart handler\n");
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pr_info("Exynos5440: arm_clk = %ldHz\n", _get_rate("arm_clk"));
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pr_info("exynos5440 clock initialization complete\n");
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}
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CLK_OF_DECLARE(exynos5440_clk, "samsung,exynos5440-clock", exynos5440_clk_init);
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