drivers/clk/samsung/clk-exynos5440.c

   1 /*
   2  * Copyright (c) 2013 Samsung Electronics Co., Ltd.
   3  * Author: Thomas Abraham <thomas.ab@samsung.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Common Clock Framework support for Exynos5440 SoC.
  10 */
  11
  12 #include <dt-bindings/clock/exynos5440.h>
  13 #include <linux/clk.h>
  14 #include <linux/clkdev.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/of.h>
  17 #include <linux/of_address.h>
  18
  19 #include "clk.h"
  20 #include "clk-pll.h"
  21
  22 #define CLKEN_OV_VAL            0xf8
  23 #define CPU_CLK_STATUS          0xfc
  24 #define MISC_DOUT1              0x558
  25
  26 /* parent clock name list */
  27 PNAME(mout_armclk_p)    = { "cplla", "cpllb" };
  28 PNAME(mout_spi_p)       = { "div125", "div200" };
  29
  30 /* fixed rate clocks generated outside the soc */
  31 static struct samsung_fixed_rate_clock exynos5440_fixed_rate_ext_clks[] __initdata = {
  32         FRATE(0, "xtal", NULL, CLK_IS_ROOT, 0),
  33 };
  34
  35 /* fixed rate clocks */
  36 static struct samsung_fixed_rate_clock exynos5440_fixed_rate_clks[] __initdata = {
  37         FRATE(0, "ppll", NULL, CLK_IS_ROOT, 1000000000),
  38         FRATE(0, "usb_phy0", NULL, CLK_IS_ROOT, 60000000),
  39         FRATE(0, "usb_phy1", NULL, CLK_IS_ROOT, 60000000),
  40         FRATE(0, "usb_ohci12", NULL, CLK_IS_ROOT, 12000000),
  41         FRATE(0, "usb_ohci48", NULL, CLK_IS_ROOT, 48000000),
  42 };
  43
  44 /* fixed factor clocks */
  45 static struct samsung_fixed_factor_clock exynos5440_fixed_factor_clks[] __initdata = {
  46         FFACTOR(0, "div250", "ppll", 1, 4, 0),
  47         FFACTOR(0, "div200", "ppll", 1, 5, 0),
  48         FFACTOR(0, "div125", "div250", 1, 2, 0),
  49 };
  50
  51 /* mux clocks */
  52 static struct samsung_mux_clock exynos5440_mux_clks[] __initdata = {
  53         MUX(0, "mout_spi", mout_spi_p, MISC_DOUT1, 5, 1),
  54         MUX_A(CLK_ARM_CLK, "arm_clk", mout_armclk_p,
  55                         CPU_CLK_STATUS, 0, 1, "armclk"),
  56 };
  57
  58 /* divider clocks */
  59 static struct samsung_div_clock exynos5440_div_clks[] __initdata = {
  60         DIV(CLK_SPI_BAUD, "div_spi", "mout_spi", MISC_DOUT1, 3, 2),
  61 };
  62
  63 /* gate clocks */
  64 static struct samsung_gate_clock exynos5440_gate_clks[] __initdata = {
  65         GATE(CLK_PB0_250, "pb0_250", "div250", CLKEN_OV_VAL, 3, 0, 0),
  66         GATE(CLK_PR0_250, "pr0_250", "div250", CLKEN_OV_VAL, 4, 0, 0),
  67         GATE(CLK_PR1_250, "pr1_250", "div250", CLKEN_OV_VAL, 5, 0, 0),
  68         GATE(CLK_B_250, "b_250", "div250", CLKEN_OV_VAL, 9, 0, 0),
  69         GATE(CLK_B_125, "b_125", "div125", CLKEN_OV_VAL, 10, 0, 0),
  70         GATE(CLK_B_200, "b_200", "div200", CLKEN_OV_VAL, 11, 0, 0),
  71         GATE(CLK_SATA, "sata", "div200", CLKEN_OV_VAL, 12, 0, 0),
  72         GATE(CLK_USB, "usb", "div200", CLKEN_OV_VAL, 13, 0, 0),
  73         GATE(CLK_GMAC0, "gmac0", "div200", CLKEN_OV_VAL, 14, 0, 0),
  74         GATE(CLK_CS250, "cs250", "div250", CLKEN_OV_VAL, 19, 0, 0),
  75         GATE(CLK_PB0_250_O, "pb0_250_o", "pb0_250", CLKEN_OV_VAL, 3, 0, 0),
  76         GATE(CLK_PR0_250_O, "pr0_250_o", "pr0_250", CLKEN_OV_VAL, 4, 0, 0),
  77         GATE(CLK_PR1_250_O, "pr1_250_o", "pr1_250", CLKEN_OV_VAL, 5, 0, 0),
  78         GATE(CLK_B_250_O, "b_250_o", "b_250", CLKEN_OV_VAL, 9, 0, 0),
  79         GATE(CLK_B_125_O, "b_125_o", "b_125", CLKEN_OV_VAL, 10, 0, 0),
  80         GATE(CLK_B_200_O, "b_200_o", "b_200", CLKEN_OV_VAL, 11, 0, 0),
  81         GATE(CLK_SATA_O, "sata_o", "sata", CLKEN_OV_VAL, 12, 0, 0),
  82         GATE(CLK_USB_O, "usb_o", "usb", CLKEN_OV_VAL, 13, 0, 0),
  83         GATE(CLK_GMAC0_O, "gmac0_o", "gmac", CLKEN_OV_VAL, 14, 0, 0),
  84         GATE(CLK_CS250_O, "cs250_o", "cs250", CLKEN_OV_VAL, 19, 0, 0),
  85 };
  86
  87 static struct of_device_id ext_clk_match[] __initdata = {
  88         { .compatible = "samsung,clock-xtal", .data = (void *)0, },
  89         {},
  90 };
  91
  92 /* register exynos5440 clocks */
  93 static void __init exynos5440_clk_init(struct device_node *np)
  94 {
  95         void __iomem *reg_base;
  96         struct samsung_clk_provider *ctx;
  97
  98         reg_base = of_iomap(np, 0);
  99         if (!reg_base) {
 100                 pr_err("%s: failed to map clock controller registers,"
 101                         " aborting clock initialization\n", __func__);
 102                 return;
 103         }
 104
 105         ctx = samsung_clk_init(np, reg_base, CLK_NR_CLKS);
 106         if (!ctx)
 107                 panic("%s: unable to allocate context.\n", __func__);
 108
 109         samsung_clk_of_register_fixed_ext(ctx, exynos5440_fixed_rate_ext_clks,
 110                 ARRAY_SIZE(exynos5440_fixed_rate_ext_clks), ext_clk_match);
 111
 112         samsung_clk_register_pll2550x("cplla", "xtal", reg_base + 0x1c, 0x10);
 113         samsung_clk_register_pll2550x("cpllb", "xtal", reg_base + 0x20, 0x10);
 114
 115         samsung_clk_register_fixed_rate(ctx, exynos5440_fixed_rate_clks,
 116                         ARRAY_SIZE(exynos5440_fixed_rate_clks));
 117         samsung_clk_register_fixed_factor(ctx, exynos5440_fixed_factor_clks,
 118                         ARRAY_SIZE(exynos5440_fixed_factor_clks));
 119         samsung_clk_register_mux(ctx, exynos5440_mux_clks,
 120                         ARRAY_SIZE(exynos5440_mux_clks));
 121         samsung_clk_register_div(ctx, exynos5440_div_clks,
 122                         ARRAY_SIZE(exynos5440_div_clks));
 123         samsung_clk_register_gate(ctx, exynos5440_gate_clks,
 124                         ARRAY_SIZE(exynos5440_gate_clks));
 125
 126         pr_info("Exynos5440: arm_clk = %ldHz\n", _get_rate("arm_clk"));
 127         pr_info("exynos5440 clock initialization complete\n");
 128 }
 129 CLK_OF_DECLARE(exynos5440_clk, "samsung,exynos5440-clock", exynos5440_clk_init);