- 根目录:
- drivers
- clk
- samsung
- clk-s3c2443.c
/*
* Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de>
*
* 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 S3C2443 and following SoCs.
*/
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/syscore_ops.h>
#include <linux/reboot.h>
#include <dt-bindings/clock/s3c2443.h>
#include "clk.h"
#include "clk-pll.h"
/* S3C2416 clock controller register offsets */
#define LOCKCON0 0x00
#define LOCKCON1 0x04
#define MPLLCON 0x10
#define EPLLCON 0x18
#define EPLLCON_K 0x1C
#define CLKSRC 0x20
#define CLKDIV0 0x24
#define CLKDIV1 0x28
#define CLKDIV2 0x2C
#define HCLKCON 0x30
#define PCLKCON 0x34
#define SCLKCON 0x38
#define SWRST 0x44
/* the soc types */
enum supported_socs {
S3C2416,
S3C2443,
S3C2450,
};
/* list of PLLs to be registered */
enum s3c2443_plls {
mpll, epll,
};
static void __iomem *reg_base;
#ifdef CONFIG_PM_SLEEP
static struct samsung_clk_reg_dump *s3c2443_save;
/*
* list of controller registers to be saved and restored during a
* suspend/resume cycle.
*/
static unsigned long s3c2443_clk_regs[] __initdata = {
LOCKCON0,
LOCKCON1,
MPLLCON,
EPLLCON,
EPLLCON_K,
CLKSRC,
CLKDIV0,
CLKDIV1,
CLKDIV2,
PCLKCON,
HCLKCON,
SCLKCON,
};
static int s3c2443_clk_suspend(void)
{
samsung_clk_save(reg_base, s3c2443_save,
ARRAY_SIZE(s3c2443_clk_regs));
return 0;
}
static void s3c2443_clk_resume(void)
{
samsung_clk_restore(reg_base, s3c2443_save,
ARRAY_SIZE(s3c2443_clk_regs));
}
static struct syscore_ops s3c2443_clk_syscore_ops = {
.suspend = s3c2443_clk_suspend,
.resume = s3c2443_clk_resume,
};
static void s3c2443_clk_sleep_init(void)
{
s3c2443_save = samsung_clk_alloc_reg_dump(s3c2443_clk_regs,
ARRAY_SIZE(s3c2443_clk_regs));
if (!s3c2443_save) {
pr_warn("%s: failed to allocate sleep save data, no sleep support!\n",
__func__);
return;
}
register_syscore_ops(&s3c2443_clk_syscore_ops);
return;
}
#else
static void s3c2443_clk_sleep_init(void) {}
#endif
PNAME(epllref_p) = { "mpllref", "mpllref", "xti", "ext" };
PNAME(esysclk_p) = { "epllref", "epll" };
PNAME(mpllref_p) = { "xti", "mdivclk" };
PNAME(msysclk_p) = { "mpllref", "mpll" };
PNAME(armclk_p) = { "armdiv" , "hclk" };
PNAME(i2s0_p) = { "div_i2s0", "ext_i2s", "epllref", "epllref" };
struct samsung_mux_clock s3c2443_common_muxes[] __initdata = {
MUX(0, "epllref", epllref_p, CLKSRC, 7, 2),
MUX(ESYSCLK, "esysclk", esysclk_p, CLKSRC, 6, 1),
MUX(0, "mpllref", mpllref_p, CLKSRC, 3, 1),
MUX_A(MSYSCLK, "msysclk", msysclk_p, CLKSRC, 4, 1, "msysclk"),
MUX_A(ARMCLK, "armclk", armclk_p, CLKDIV0, 13, 1, "armclk"),
MUX(0, "mux_i2s0", i2s0_p, CLKSRC, 14, 2),
};
static struct clk_div_table hclk_d[] = {
{ .val = 0, .div = 1 },
{ .val = 1, .div = 2 },
{ .val = 3, .div = 4 },
{ /* sentinel */ },
};
static struct clk_div_table mdivclk_d[] = {
{ .val = 0, .div = 1 },
{ .val = 1, .div = 3 },
{ .val = 2, .div = 5 },
{ .val = 3, .div = 7 },
{ .val = 4, .div = 9 },
{ .val = 5, .div = 11 },
{ .val = 6, .div = 13 },
{ .val = 7, .div = 15 },
{ /* sentinel */ },
};
struct samsung_div_clock s3c2443_common_dividers[] __initdata = {
DIV_T(0, "mdivclk", "xti", CLKDIV0, 6, 3, mdivclk_d),
DIV(0, "prediv", "msysclk", CLKDIV0, 4, 2),
DIV_T(HCLK, "hclk", "prediv", CLKDIV0, 0, 2, hclk_d),
DIV(PCLK, "pclk", "hclk", CLKDIV0, 2, 1),
DIV(0, "div_hsspi0_epll", "esysclk", CLKDIV1, 24, 2),
DIV(0, "div_fimd", "esysclk", CLKDIV1, 16, 8),
DIV(0, "div_i2s0", "esysclk", CLKDIV1, 12, 4),
DIV(0, "div_uart", "esysclk", CLKDIV1, 8, 4),
DIV(0, "div_hsmmc1", "esysclk", CLKDIV1, 6, 2),
DIV(0, "div_usbhost", "esysclk", CLKDIV1, 4, 2),
};
struct samsung_gate_clock s3c2443_common_gates[] __initdata = {
GATE(SCLK_HSMMC_EXT, "sclk_hsmmcext", "ext", SCLKCON, 13, 0, 0),
GATE(SCLK_HSMMC1, "sclk_hsmmc1", "div_hsmmc1", SCLKCON, 12, 0, 0),
GATE(SCLK_FIMD, "sclk_fimd", "div_fimd", SCLKCON, 10, 0, 0),
GATE(SCLK_I2S0, "sclk_i2s0", "mux_i2s0", SCLKCON, 9, 0, 0),
GATE(SCLK_UART, "sclk_uart", "div_uart", SCLKCON, 8, 0, 0),
GATE(SCLK_USBH, "sclk_usbhost", "div_usbhost", SCLKCON, 1, 0, 0),
GATE(HCLK_DRAM, "dram", "hclk", HCLKCON, 19, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_SSMC, "ssmc", "hclk", HCLKCON, 18, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_HSMMC1, "hsmmc1", "hclk", HCLKCON, 16, 0, 0),
GATE(HCLK_USBD, "usb-device", "hclk", HCLKCON, 12, 0, 0),
GATE(HCLK_USBH, "usb-host", "hclk", HCLKCON, 11, 0, 0),
GATE(HCLK_LCD, "lcd", "hclk", HCLKCON, 9, 0, 0),
GATE(HCLK_DMA5, "dma5", "hclk", HCLKCON, 5, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_DMA4, "dma4", "hclk", HCLKCON, 4, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_DMA3, "dma3", "hclk", HCLKCON, 3, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_DMA2, "dma2", "hclk", HCLKCON, 2, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_DMA1, "dma1", "hclk", HCLKCON, 1, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_DMA0, "dma0", "hclk", HCLKCON, 0, CLK_IGNORE_UNUSED, 0),
GATE(PCLK_GPIO, "gpio", "pclk", PCLKCON, 13, CLK_IGNORE_UNUSED, 0),
GATE(PCLK_RTC, "rtc", "pclk", PCLKCON, 12, 0, 0),
GATE(PCLK_WDT, "wdt", "pclk", PCLKCON, 11, 0, 0),
GATE(PCLK_PWM, "pwm", "pclk", PCLKCON, 10, 0, 0),
GATE(PCLK_I2S0, "i2s0", "pclk", PCLKCON, 9, 0, 0),
GATE(PCLK_AC97, "ac97", "pclk", PCLKCON, 8, 0, 0),
GATE(PCLK_ADC, "adc", "pclk", PCLKCON, 7, 0, 0),
GATE(PCLK_SPI0, "spi0", "pclk", PCLKCON, 6, 0, 0),
GATE(PCLK_I2C0, "i2c0", "pclk", PCLKCON, 4, 0, 0),
GATE(PCLK_UART3, "uart3", "pclk", PCLKCON, 3, 0, 0),
GATE(PCLK_UART2, "uart2", "pclk", PCLKCON, 2, 0, 0),
GATE(PCLK_UART1, "uart1", "pclk", PCLKCON, 1, 0, 0),
GATE(PCLK_UART0, "uart0", "pclk", PCLKCON, 0, 0, 0),
};
struct samsung_clock_alias s3c2443_common_aliases[] __initdata = {
ALIAS(HCLK, NULL, "hclk"),
ALIAS(HCLK_SSMC, NULL, "nand"),
ALIAS(PCLK_UART0, "s3c2440-uart.0", "uart"),
ALIAS(PCLK_UART1, "s3c2440-uart.1", "uart"),
ALIAS(PCLK_UART2, "s3c2440-uart.2", "uart"),
ALIAS(PCLK_UART3, "s3c2440-uart.3", "uart"),
ALIAS(PCLK_UART0, "s3c2440-uart.0", "clk_uart_baud2"),
ALIAS(PCLK_UART1, "s3c2440-uart.1", "clk_uart_baud2"),
ALIAS(PCLK_UART2, "s3c2440-uart.2", "clk_uart_baud2"),
ALIAS(PCLK_UART3, "s3c2440-uart.3", "clk_uart_baud2"),
ALIAS(SCLK_UART, NULL, "clk_uart_baud3"),
ALIAS(PCLK_PWM, NULL, "timers"),
ALIAS(PCLK_RTC, NULL, "rtc"),
ALIAS(PCLK_WDT, NULL, "watchdog"),
ALIAS(PCLK_ADC, NULL, "adc"),
ALIAS(PCLK_I2C0, "s3c2410-i2c.0", "i2c"),
ALIAS(HCLK_USBD, NULL, "usb-device"),
ALIAS(HCLK_USBH, NULL, "usb-host"),
ALIAS(SCLK_USBH, NULL, "usb-bus-host"),
ALIAS(PCLK_SPI0, "s3c2443-spi.0", "spi"),
ALIAS(PCLK_SPI0, "s3c2443-spi.0", "spi_busclk0"),
ALIAS(HCLK_HSMMC1, "s3c-sdhci.1", "hsmmc"),
ALIAS(HCLK_HSMMC1, "s3c-sdhci.1", "mmc_busclk.0"),
ALIAS(PCLK_I2S0, "samsung-i2s.0", "iis"),
ALIAS(SCLK_I2S0, NULL, "i2s-if"),
ALIAS(HCLK_LCD, NULL, "lcd"),
ALIAS(SCLK_FIMD, NULL, "sclk_fimd"),
};
/* S3C2416 specific clocks */
static struct samsung_pll_clock s3c2416_pll_clks[] __initdata = {
[mpll] = PLL(pll_6552_s3c2416, 0, "mpll", "mpllref",
LOCKCON0, MPLLCON, NULL),
[epll] = PLL(pll_6553, 0, "epll", "epllref",
LOCKCON1, EPLLCON, NULL),
};
PNAME(s3c2416_hsmmc0_p) = { "sclk_hsmmc0", "sclk_hsmmcext" };
PNAME(s3c2416_hsmmc1_p) = { "sclk_hsmmc1", "sclk_hsmmcext" };
PNAME(s3c2416_hsspi0_p) = { "hsspi0_epll", "hsspi0_mpll" };
static struct clk_div_table armdiv_s3c2416_d[] = {
{ .val = 0, .div = 1 },
{ .val = 1, .div = 2 },
{ .val = 2, .div = 3 },
{ .val = 3, .div = 4 },
{ .val = 5, .div = 6 },
{ .val = 7, .div = 8 },
{ /* sentinel */ },
};
struct samsung_div_clock s3c2416_dividers[] __initdata = {
DIV_T(ARMDIV, "armdiv", "msysclk", CLKDIV0, 9, 3, armdiv_s3c2416_d),
DIV(0, "div_hsspi0_mpll", "msysclk", CLKDIV2, 0, 4),
DIV(0, "div_hsmmc0", "esysclk", CLKDIV2, 6, 2),
};
struct samsung_mux_clock s3c2416_muxes[] __initdata = {
MUX(MUX_HSMMC0, "mux_hsmmc0", s3c2416_hsmmc0_p, CLKSRC, 16, 1),
MUX(MUX_HSMMC1, "mux_hsmmc1", s3c2416_hsmmc1_p, CLKSRC, 17, 1),
MUX(MUX_HSSPI0, "mux_hsspi0", s3c2416_hsspi0_p, CLKSRC, 18, 1),
};
struct samsung_gate_clock s3c2416_gates[] __initdata = {
GATE(0, "hsspi0_mpll", "div_hsspi0_mpll", SCLKCON, 19, 0, 0),
GATE(0, "hsspi0_epll", "div_hsspi0_epll", SCLKCON, 14, 0, 0),
GATE(0, "sclk_hsmmc0", "div_hsmmc0", SCLKCON, 6, 0, 0),
GATE(HCLK_2D, "2d", "hclk", HCLKCON, 20, 0, 0),
GATE(HCLK_HSMMC0, "hsmmc0", "hclk", HCLKCON, 15, 0, 0),
GATE(HCLK_IROM, "irom", "hclk", HCLKCON, 13, CLK_IGNORE_UNUSED, 0),
GATE(PCLK_PCM, "pcm", "pclk", PCLKCON, 19, 0, 0),
};
struct samsung_clock_alias s3c2416_aliases[] __initdata = {
ALIAS(HCLK_HSMMC0, "s3c-sdhci.0", "hsmmc"),
ALIAS(HCLK_HSMMC0, "s3c-sdhci.0", "mmc_busclk.0"),
ALIAS(MUX_HSMMC0, "s3c-sdhci.0", "mmc_busclk.2"),
ALIAS(MUX_HSMMC1, "s3c-sdhci.1", "mmc_busclk.2"),
ALIAS(MUX_HSSPI0, "s3c2443-spi.0", "spi_busclk2"),
ALIAS(ARMDIV, NULL, "armdiv"),
};
/* S3C2443 specific clocks */
static struct samsung_pll_clock s3c2443_pll_clks[] __initdata = {
[mpll] = PLL(pll_3000, 0, "mpll", "mpllref",
LOCKCON0, MPLLCON, NULL),
[epll] = PLL(pll_2126, 0, "epll", "epllref",
LOCKCON1, EPLLCON, NULL),
};
static struct clk_div_table armdiv_s3c2443_d[] = {
{ .val = 0, .div = 1 },
{ .val = 8, .div = 2 },
{ .val = 2, .div = 3 },
{ .val = 9, .div = 4 },
{ .val = 10, .div = 6 },
{ .val = 11, .div = 8 },
{ .val = 13, .div = 12 },
{ .val = 15, .div = 16 },
{ /* sentinel */ },
};
struct samsung_div_clock s3c2443_dividers[] __initdata = {
DIV_T(ARMDIV, "armdiv", "msysclk", CLKDIV0, 9, 4, armdiv_s3c2443_d),
DIV(0, "div_cam", "esysclk", CLKDIV1, 26, 4),
};
struct samsung_gate_clock s3c2443_gates[] __initdata = {
GATE(SCLK_HSSPI0, "sclk_hsspi0", "div_hsspi0_epll", SCLKCON, 14, 0, 0),
GATE(SCLK_CAM, "sclk_cam", "div_cam", SCLKCON, 11, 0, 0),
GATE(HCLK_CFC, "cfc", "hclk", HCLKCON, 17, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_CAM, "cam", "hclk", HCLKCON, 8, 0, 0),
GATE(PCLK_SPI1, "spi1", "pclk", PCLKCON, 15, 0, 0),
GATE(PCLK_SDI, "sdi", "pclk", PCLKCON, 5, 0, 0),
};
struct samsung_clock_alias s3c2443_aliases[] __initdata = {
ALIAS(SCLK_HSSPI0, "s3c2443-spi.0", "spi_busclk2"),
ALIAS(SCLK_HSMMC1, "s3c-sdhci.1", "mmc_busclk.2"),
ALIAS(SCLK_CAM, NULL, "camif-upll"),
ALIAS(PCLK_SPI1, "s3c2410-spi.0", "spi"),
ALIAS(PCLK_SDI, NULL, "sdi"),
ALIAS(HCLK_CFC, NULL, "cfc"),
ALIAS(ARMDIV, NULL, "armdiv"),
};
/* S3C2450 specific clocks */
PNAME(s3c2450_cam_p) = { "div_cam", "hclk" };
PNAME(s3c2450_hsspi1_p) = { "hsspi1_epll", "hsspi1_mpll" };
PNAME(i2s1_p) = { "div_i2s1", "ext_i2s", "epllref", "epllref" };
struct samsung_div_clock s3c2450_dividers[] __initdata = {
DIV(0, "div_cam", "esysclk", CLKDIV1, 26, 4),
DIV(0, "div_hsspi1_epll", "esysclk", CLKDIV2, 24, 2),
DIV(0, "div_hsspi1_mpll", "msysclk", CLKDIV2, 16, 4),
DIV(0, "div_i2s1", "esysclk", CLKDIV2, 12, 4),
};
struct samsung_mux_clock s3c2450_muxes[] __initdata = {
MUX(0, "mux_cam", s3c2450_cam_p, CLKSRC, 20, 1),
MUX(MUX_HSSPI1, "mux_hsspi1", s3c2450_hsspi1_p, CLKSRC, 19, 1),
MUX(0, "mux_i2s1", i2s1_p, CLKSRC, 12, 2),
};
struct samsung_gate_clock s3c2450_gates[] __initdata = {
GATE(SCLK_I2S1, "sclk_i2s1", "div_i2s1", SCLKCON, 5, 0, 0),
GATE(HCLK_CFC, "cfc", "hclk", HCLKCON, 17, 0, 0),
GATE(HCLK_CAM, "cam", "hclk", HCLKCON, 8, 0, 0),
GATE(HCLK_DMA7, "dma7", "hclk", HCLKCON, 7, CLK_IGNORE_UNUSED, 0),
GATE(HCLK_DMA6, "dma6", "hclk", HCLKCON, 6, CLK_IGNORE_UNUSED, 0),
GATE(PCLK_I2S1, "i2s1", "pclk", PCLKCON, 17, 0, 0),
GATE(PCLK_I2C1, "i2c1", "pclk", PCLKCON, 16, 0, 0),
GATE(PCLK_SPI1, "spi1", "pclk", PCLKCON, 14, 0, 0),
};
struct samsung_clock_alias s3c2450_aliases[] __initdata = {
ALIAS(PCLK_SPI1, "s3c2443-spi.1", "spi"),
ALIAS(PCLK_SPI1, "s3c2443-spi.1", "spi_busclk0"),
ALIAS(MUX_HSSPI1, "s3c2443-spi.1", "spi_busclk2"),
ALIAS(PCLK_I2C1, "s3c2410-i2c.1", "i2c"),
};
static int s3c2443_restart(struct notifier_block *this,
unsigned long mode, void *cmd)
{
__raw_writel(0x533c2443, reg_base + SWRST);
return NOTIFY_DONE;
}
static struct notifier_block s3c2443_restart_handler = {
.notifier_call = s3c2443_restart,
.priority = 129,
};
/*
* fixed rate clocks generated outside the soc
* Only necessary until the devicetree-move is complete
*/
struct samsung_fixed_rate_clock s3c2443_common_frate_clks[] __initdata = {
FRATE(0, "xti", NULL, CLK_IS_ROOT, 0),
FRATE(0, "ext", NULL, CLK_IS_ROOT, 0),
FRATE(0, "ext_i2s", NULL, CLK_IS_ROOT, 0),
FRATE(0, "ext_uart", NULL, CLK_IS_ROOT, 0),
};
static void __init s3c2443_common_clk_register_fixed_ext(
struct samsung_clk_provider *ctx, unsigned long xti_f)
{
s3c2443_common_frate_clks[0].fixed_rate = xti_f;
samsung_clk_register_fixed_rate(ctx, s3c2443_common_frate_clks,
ARRAY_SIZE(s3c2443_common_frate_clks));
}
void __init s3c2443_common_clk_init(struct device_node *np, unsigned long xti_f,
int current_soc,
void __iomem *base)
{
struct samsung_clk_provider *ctx;
int ret;
reg_base = base;
if (np) {
reg_base = of_iomap(np, 0);
if (!reg_base)
panic("%s: failed to map registers\n", __func__);
}
ctx = samsung_clk_init(np, reg_base, NR_CLKS);
if (!ctx)
panic("%s: unable to allocate context.\n", __func__);
/* Register external clocks only in non-dt cases */
if (!np)
s3c2443_common_clk_register_fixed_ext(ctx, xti_f);
/* Register PLLs. */
if (current_soc == S3C2416 || current_soc == S3C2450)
samsung_clk_register_pll(ctx, s3c2416_pll_clks,
ARRAY_SIZE(s3c2416_pll_clks), reg_base);
else
samsung_clk_register_pll(ctx, s3c2443_pll_clks,
ARRAY_SIZE(s3c2443_pll_clks), reg_base);
/* Register common internal clocks. */
samsung_clk_register_mux(ctx, s3c2443_common_muxes,
ARRAY_SIZE(s3c2443_common_muxes));
samsung_clk_register_div(ctx, s3c2443_common_dividers,
ARRAY_SIZE(s3c2443_common_dividers));
samsung_clk_register_gate(ctx, s3c2443_common_gates,
ARRAY_SIZE(s3c2443_common_gates));
samsung_clk_register_alias(ctx, s3c2443_common_aliases,
ARRAY_SIZE(s3c2443_common_aliases));
/* Register SoC-specific clocks. */
switch (current_soc) {
case S3C2450:
samsung_clk_register_div(ctx, s3c2450_dividers,
ARRAY_SIZE(s3c2450_dividers));
samsung_clk_register_mux(ctx, s3c2450_muxes,
ARRAY_SIZE(s3c2450_muxes));
samsung_clk_register_gate(ctx, s3c2450_gates,
ARRAY_SIZE(s3c2450_gates));
samsung_clk_register_alias(ctx, s3c2450_aliases,
ARRAY_SIZE(s3c2450_aliases));
/* fall through, as s3c2450 extends the s3c2416 clocks */
case S3C2416:
samsung_clk_register_div(ctx, s3c2416_dividers,
ARRAY_SIZE(s3c2416_dividers));
samsung_clk_register_mux(ctx, s3c2416_muxes,
ARRAY_SIZE(s3c2416_muxes));
samsung_clk_register_gate(ctx, s3c2416_gates,
ARRAY_SIZE(s3c2416_gates));
samsung_clk_register_alias(ctx, s3c2416_aliases,
ARRAY_SIZE(s3c2416_aliases));
break;
case S3C2443:
samsung_clk_register_div(ctx, s3c2443_dividers,
ARRAY_SIZE(s3c2443_dividers));
samsung_clk_register_gate(ctx, s3c2443_gates,
ARRAY_SIZE(s3c2443_gates));
samsung_clk_register_alias(ctx, s3c2443_aliases,
ARRAY_SIZE(s3c2443_aliases));
break;
}
s3c2443_clk_sleep_init();
samsung_clk_of_add_provider(np, ctx);
ret = register_restart_handler(&s3c2443_restart_handler);
if (ret)
pr_warn("cannot register restart handler, %d\n", ret);
}
static void __init s3c2416_clk_init(struct device_node *np)
{
s3c2443_common_clk_init(np, 0, S3C2416, 0);
}
CLK_OF_DECLARE(s3c2416_clk, "samsung,s3c2416-clock", s3c2416_clk_init);
static void __init s3c2443_clk_init(struct device_node *np)
{
s3c2443_common_clk_init(np, 0, S3C2443, 0);
}
CLK_OF_DECLARE(s3c2443_clk, "samsung,s3c2443-clock", s3c2443_clk_init);
static void __init s3c2450_clk_init(struct device_node *np)
{
s3c2443_common_clk_init(np, 0, S3C2450, 0);
}
CLK_OF_DECLARE(s3c2450_clk, "samsung,s3c2450-clock", s3c2450_clk_init);