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linux/drivers/clk/samsung/clk-exynos5410.c
Sylwester Nawrocki be95d2c7d9 clk: samsung: Add support for EPLL on exynos5410 
This patch adds code instantiating the EPLL, which is used as the
audio subsystem's root clock.
The requirement to specify the external root clock in clocks property
is documented.  Having the consumer 'clocks' property ensures proper
initialization order by explicitly specifying dependencies in DT.
It prevents situations when the SoC's clock controller driver has
initialized, the external oscillator clock is not yet registered
and setting clock frequencies through assigned-clock-rates property
doesn't work properly due to unknown external oscillator frequency.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
2016-09-09 17:35:13 +02:00

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/*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* Author: Tarek Dakhran <t.dakhran@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 Exynos5410 SoC.
*/
#include <dt-bindings/clock/exynos5410.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clk.h>
#include "clk.h"
#define APLL_LOCK 0x0
#define APLL_CON0 0x100
#define CPLL_LOCK 0x10020
#define CPLL_CON0 0x10120
#define EPLL_LOCK 0x10040
#define EPLL_CON0 0x10130
#define MPLL_LOCK 0x4000
#define MPLL_CON0 0x4100
#define BPLL_LOCK 0x20010
#define BPLL_CON0 0x20110
#define KPLL_LOCK 0x28000
#define KPLL_CON0 0x28100
#define SRC_CPU 0x200
#define DIV_CPU0 0x500
#define SRC_CPERI1 0x4204
#define GATE_IP_G2D 0x8800
#define DIV_TOP0 0x10510
#define DIV_TOP1 0x10514
#define DIV_FSYS0 0x10548
#define DIV_FSYS1 0x1054c
#define DIV_FSYS2 0x10550
#define DIV_PERIC0 0x10558
#define DIV_PERIC3 0x10564
#define SRC_TOP0 0x10210
#define SRC_TOP1 0x10214
#define SRC_TOP2 0x10218
#define SRC_FSYS 0x10244
#define SRC_PERIC0 0x10250
#define SRC_MASK_FSYS 0x10340
#define SRC_MASK_PERIC0 0x10350
#define GATE_BUS_FSYS0 0x10740
#define GATE_TOP_SCLK_FSYS 0x10840
#define GATE_TOP_SCLK_PERIC 0x10850
#define GATE_IP_FSYS 0x10944
#define GATE_IP_PERIC 0x10950
#define GATE_IP_PERIS 0x10960
#define SRC_CDREX 0x20200
#define SRC_KFC 0x28200
#define DIV_KFC0 0x28500
/* list of PLLs */
enum exynos5410_plls {
apll, cpll, epll, mpll,
bpll, kpll,
nr_plls /* number of PLLs */
};
/* list of all parent clocks */
PNAME(apll_p) = { "fin_pll", "fout_apll", };
PNAME(bpll_p) = { "fin_pll", "fout_bpll", };
PNAME(cpll_p) = { "fin_pll", "fout_cpll" };
PNAME(epll_p) = { "fin_pll", "fout_epll" };
PNAME(mpll_p) = { "fin_pll", "fout_mpll", };
PNAME(kpll_p) = { "fin_pll", "fout_kpll", };
PNAME(mout_cpu_p) = { "mout_apll", "sclk_mpll", };
PNAME(mout_kfc_p) = { "mout_kpll", "sclk_mpll", };
PNAME(mpll_user_p) = { "fin_pll", "sclk_mpll", };
PNAME(bpll_user_p) = { "fin_pll", "sclk_bpll", };
PNAME(mpll_bpll_p) = { "sclk_mpll_muxed", "sclk_bpll_muxed", };
PNAME(sclk_mpll_bpll_p) = { "sclk_mpll_bpll", "fin_pll", };
PNAME(group2_p) = { "fin_pll", "fin_pll", "none", "none",
"none", "none", "sclk_mpll_bpll",
"none", "none", "sclk_cpll" };
static const struct samsung_mux_clock exynos5410_mux_clks[] __initconst = {
MUX(0, "mout_apll", apll_p, SRC_CPU, 0, 1),
MUX(0, "mout_cpu", mout_cpu_p, SRC_CPU, 16, 1),
MUX(0, "mout_kpll", kpll_p, SRC_KFC, 0, 1),
MUX(0, "mout_kfc", mout_kfc_p, SRC_KFC, 16, 1),
MUX(0, "sclk_mpll", mpll_p, SRC_CPERI1, 8, 1),
MUX(0, "sclk_mpll_muxed", mpll_user_p, SRC_TOP2, 20, 1),
MUX(0, "sclk_bpll", bpll_p, SRC_CDREX, 0, 1),
MUX(0, "sclk_bpll_muxed", bpll_user_p, SRC_TOP2, 24, 1),
MUX(0, "sclk_epll", epll_p, SRC_TOP2, 12, 1),
MUX(0, "sclk_cpll", cpll_p, SRC_TOP2, 8, 1),
MUX(0, "sclk_mpll_bpll", mpll_bpll_p, SRC_TOP1, 20, 1),
MUX(0, "mout_mmc0", group2_p, SRC_FSYS, 0, 4),
MUX(0, "mout_mmc1", group2_p, SRC_FSYS, 4, 4),
MUX(0, "mout_mmc2", group2_p, SRC_FSYS, 8, 4),
MUX(0, "mout_usbd300", sclk_mpll_bpll_p, SRC_FSYS, 28, 1),
MUX(0, "mout_usbd301", sclk_mpll_bpll_p, SRC_FSYS, 29, 1),
MUX(0, "mout_uart0", group2_p, SRC_PERIC0, 0, 4),
MUX(0, "mout_uart1", group2_p, SRC_PERIC0, 4, 4),
MUX(0, "mout_uart2", group2_p, SRC_PERIC0, 8, 4),
MUX(0, "mout_uart3", group2_p, SRC_PERIC0, 12, 4),
MUX(0, "mout_pwm", group2_p, SRC_PERIC0, 24, 4),
MUX(0, "mout_aclk200", mpll_bpll_p, SRC_TOP0, 12, 1),
MUX(0, "mout_aclk400", mpll_bpll_p, SRC_TOP0, 20, 1),
};
static const struct samsung_div_clock exynos5410_div_clks[] __initconst = {
DIV(0, "div_arm", "mout_cpu", DIV_CPU0, 0, 3),
DIV(0, "div_arm2", "div_arm", DIV_CPU0, 28, 3),
DIV(0, "div_acp", "div_arm2", DIV_CPU0, 8, 3),
DIV(0, "div_cpud", "div_arm2", DIV_CPU0, 4, 3),
DIV(0, "div_atb", "div_arm2", DIV_CPU0, 16, 3),
DIV(0, "pclk_dbg", "div_arm2", DIV_CPU0, 20, 3),
DIV(0, "div_kfc", "mout_kfc", DIV_KFC0, 0, 3),
DIV(0, "div_aclk", "div_kfc", DIV_KFC0, 4, 3),
DIV(0, "div_pclk", "div_kfc", DIV_KFC0, 20, 3),
DIV(0, "aclk66_pre", "sclk_mpll_muxed", DIV_TOP1, 24, 3),
DIV(0, "aclk66", "aclk66_pre", DIV_TOP0, 0, 3),
DIV(0, "dout_usbphy300", "mout_usbd300", DIV_FSYS0, 16, 4),
DIV(0, "dout_usbphy301", "mout_usbd301", DIV_FSYS0, 20, 4),
DIV(0, "dout_usbd300", "mout_usbd300", DIV_FSYS0, 24, 4),
DIV(0, "dout_usbd301", "mout_usbd301", DIV_FSYS0, 28, 4),
DIV(0, "div_mmc0", "mout_mmc0", DIV_FSYS1, 0, 4),
DIV(0, "div_mmc1", "mout_mmc1", DIV_FSYS1, 16, 4),
DIV(0, "div_mmc2", "mout_mmc2", DIV_FSYS2, 0, 4),
DIV_F(0, "div_mmc_pre0", "div_mmc0",
DIV_FSYS1, 8, 8, CLK_SET_RATE_PARENT, 0),
DIV_F(0, "div_mmc_pre1", "div_mmc1",
DIV_FSYS1, 24, 8, CLK_SET_RATE_PARENT, 0),
DIV_F(0, "div_mmc_pre2", "div_mmc2",
DIV_FSYS2, 8, 8, CLK_SET_RATE_PARENT, 0),
DIV(0, "div_uart0", "mout_uart0", DIV_PERIC0, 0, 4),
DIV(0, "div_uart1", "mout_uart1", DIV_PERIC0, 4, 4),
DIV(0, "div_uart2", "mout_uart2", DIV_PERIC0, 8, 4),
DIV(0, "div_uart3", "mout_uart3", DIV_PERIC0, 12, 4),
DIV(0, "dout_pwm", "mout_pwm", DIV_PERIC3, 0, 4),
DIV(0, "aclk200", "mout_aclk200", DIV_TOP0, 12, 3),
DIV(0, "aclk266", "mpll_user_p", DIV_TOP0, 16, 3),
DIV(0, "aclk400", "mout_aclk400", DIV_TOP0, 24, 3),
};
static const struct samsung_gate_clock exynos5410_gate_clks[] __initconst = {
GATE(CLK_SSS, "sss", "aclk266", GATE_IP_G2D, 2, 0, 0),
GATE(CLK_MCT, "mct", "aclk66", GATE_IP_PERIS, 18, 0, 0),
GATE(CLK_WDT, "wdt", "aclk66", GATE_IP_PERIS, 19, 0, 0),
GATE(CLK_RTC, "rtc", "aclk66", GATE_IP_PERIS, 20, 0, 0),
GATE(CLK_TMU, "tmu", "aclk66", GATE_IP_PERIS, 21, 0, 0),
GATE(CLK_SCLK_MMC0, "sclk_mmc0", "div_mmc_pre0",
SRC_MASK_FSYS, 0, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_MMC1, "sclk_mmc1", "div_mmc_pre1",
SRC_MASK_FSYS, 4, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_MMC2, "sclk_mmc2", "div_mmc_pre2",
SRC_MASK_FSYS, 8, CLK_SET_RATE_PARENT, 0),
GATE(CLK_MMC0, "sdmmc0", "aclk200", GATE_BUS_FSYS0, 12, 0, 0),
GATE(CLK_MMC1, "sdmmc1", "aclk200", GATE_BUS_FSYS0, 13, 0, 0),
GATE(CLK_MMC2, "sdmmc2", "aclk200", GATE_BUS_FSYS0, 14, 0, 0),
GATE(CLK_PDMA1, "pdma1", "aclk200", GATE_BUS_FSYS0, 2, 0, 0),
GATE(CLK_PDMA0, "pdma0", "aclk200", GATE_BUS_FSYS0, 1, 0, 0),
GATE(CLK_SCLK_USBPHY301, "sclk_usbphy301", "dout_usbphy301",
GATE_TOP_SCLK_FSYS, 7, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_USBPHY300, "sclk_usbphy300", "dout_usbphy300",
GATE_TOP_SCLK_FSYS, 8, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_USBD300, "sclk_usbd300", "dout_usbd300",
GATE_TOP_SCLK_FSYS, 9, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_USBD301, "sclk_usbd301", "dout_usbd301",
GATE_TOP_SCLK_FSYS, 10, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_PWM, "sclk_pwm", "dout_pwm",
GATE_TOP_SCLK_PERIC, 11, CLK_SET_RATE_PARENT, 0),
GATE(CLK_UART0, "uart0", "aclk66", GATE_IP_PERIC, 0, 0, 0),
GATE(CLK_UART1, "uart1", "aclk66", GATE_IP_PERIC, 1, 0, 0),
GATE(CLK_UART2, "uart2", "aclk66", GATE_IP_PERIC, 2, 0, 0),
GATE(CLK_UART3, "uart3", "aclk66", GATE_IP_PERIC, 3, 0, 0),
GATE(CLK_I2C0, "i2c0", "aclk66", GATE_IP_PERIC, 6, 0, 0),
GATE(CLK_I2C1, "i2c1", "aclk66", GATE_IP_PERIC, 7, 0, 0),
GATE(CLK_I2C2, "i2c2", "aclk66", GATE_IP_PERIC, 8, 0, 0),
GATE(CLK_I2C3, "i2c3", "aclk66", GATE_IP_PERIC, 9, 0, 0),
GATE(CLK_USI0, "usi0", "aclk66", GATE_IP_PERIC, 10, 0, 0),
GATE(CLK_USI1, "usi1", "aclk66", GATE_IP_PERIC, 11, 0, 0),
GATE(CLK_USI2, "usi2", "aclk66", GATE_IP_PERIC, 12, 0, 0),
GATE(CLK_USI3, "usi3", "aclk66", GATE_IP_PERIC, 13, 0, 0),
GATE(CLK_PWM, "pwm", "aclk66", GATE_IP_PERIC, 24, 0, 0),
GATE(CLK_SCLK_UART0, "sclk_uart0", "div_uart0",
SRC_MASK_PERIC0, 0, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_UART1, "sclk_uart1", "div_uart1",
SRC_MASK_PERIC0, 4, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_UART2, "sclk_uart2", "div_uart2",
SRC_MASK_PERIC0, 8, CLK_SET_RATE_PARENT, 0),
GATE(CLK_SCLK_UART3, "sclk_uart3", "div_uart3",
SRC_MASK_PERIC0, 12, CLK_SET_RATE_PARENT, 0),
GATE(CLK_USBH20, "usbh20", "aclk200_fsys", GATE_IP_FSYS, 18, 0, 0),
GATE(CLK_USBD300, "usbd300", "aclk200_fsys", GATE_IP_FSYS, 19, 0, 0),
GATE(CLK_USBD301, "usbd301", "aclk200_fsys", GATE_IP_FSYS, 20, 0, 0),
};
static const struct samsung_pll_rate_table exynos5410_pll2550x_24mhz_tbl[] __initconst = {
PLL_36XX_RATE(400000000U, 200, 3, 2, 0),
PLL_36XX_RATE(333000000U, 111, 2, 2, 0),
PLL_36XX_RATE(300000000U, 100, 2, 2, 0),
PLL_36XX_RATE(266000000U, 266, 3, 3, 0),
PLL_36XX_RATE(200000000U, 200, 3, 3, 0),
PLL_36XX_RATE(192000000U, 192, 3, 3, 0),
PLL_36XX_RATE(166000000U, 166, 3, 3, 0),
PLL_36XX_RATE(133000000U, 266, 3, 4, 0),
PLL_36XX_RATE(100000000U, 200, 3, 4, 0),
PLL_36XX_RATE(66000000U, 176, 2, 5, 0),
};
static struct samsung_pll_clock exynos5410_plls[nr_plls] __initdata = {
[apll] = PLL(pll_35xx, CLK_FOUT_APLL, "fout_apll", "fin_pll", APLL_LOCK,
APLL_CON0, NULL),
[cpll] = PLL(pll_35xx, CLK_FOUT_CPLL, "fout_cpll", "fin_pll", CPLL_LOCK,
CPLL_CON0, NULL),
[epll] = PLL(pll_2650x, CLK_FOUT_EPLL, "fout_epll", "fin_pll", EPLL_LOCK,
EPLL_CON0, NULL),
[mpll] = PLL(pll_35xx, CLK_FOUT_MPLL, "fout_mpll", "fin_pll", MPLL_LOCK,
MPLL_CON0, NULL),
[bpll] = PLL(pll_35xx, CLK_FOUT_BPLL, "fout_bpll", "fin_pll", BPLL_LOCK,
BPLL_CON0, NULL),
[kpll] = PLL(pll_35xx, CLK_FOUT_KPLL, "fout_kpll", "fin_pll", KPLL_LOCK,
KPLL_CON0, NULL),
};
static const struct samsung_cmu_info cmu __initconst = {
.pll_clks = exynos5410_plls,
.nr_pll_clks = ARRAY_SIZE(exynos5410_plls),
.mux_clks = exynos5410_mux_clks,
.nr_mux_clks = ARRAY_SIZE(exynos5410_mux_clks),
.div_clks = exynos5410_div_clks,
.nr_div_clks = ARRAY_SIZE(exynos5410_div_clks),
.gate_clks = exynos5410_gate_clks,
.nr_gate_clks = ARRAY_SIZE(exynos5410_gate_clks),
.nr_clk_ids = CLK_NR_CLKS,
};
/* register exynos5410 clocks */
static void __init exynos5410_clk_init(struct device_node *np)
{
struct clk *xxti = of_clk_get(np, 0);
if (!IS_ERR(xxti) && clk_get_rate(xxti) == 24 * MHZ)
exynos5410_plls[epll].rate_table = exynos5410_pll2550x_24mhz_tbl;
samsung_cmu_register_one(np, &cmu);
pr_debug("Exynos5410: clock setup completed.\n");
}
CLK_OF_DECLARE(exynos5410_clk, "samsung,exynos5410-clock", exynos5410_clk_init);
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