![Heiko Stübner](/assets/img/avatar_default.png)
S3C2412, S3C2443 and their derivatives contain a special software-reset register in their system-controller. Therefore register a restart handler for those. Tested on a s3c2416-based board, s3c2412 compile-tested. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
306 lines
9.3 KiB
C
306 lines
9.3 KiB
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 S3C2412 and S3C2413.
|
|
*/
|
|
|
|
#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/s3c2412.h>
|
|
|
|
#include "clk.h"
|
|
#include "clk-pll.h"
|
|
|
|
#define LOCKTIME 0x00
|
|
#define MPLLCON 0x04
|
|
#define UPLLCON 0x08
|
|
#define CLKCON 0x0c
|
|
#define CLKDIVN 0x14
|
|
#define CLKSRC 0x1c
|
|
#define SWRST 0x30
|
|
|
|
/* list of PLLs to be registered */
|
|
enum s3c2412_plls {
|
|
mpll, upll,
|
|
};
|
|
|
|
static void __iomem *reg_base;
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static struct samsung_clk_reg_dump *s3c2412_save;
|
|
|
|
/*
|
|
* list of controller registers to be saved and restored during a
|
|
* suspend/resume cycle.
|
|
*/
|
|
static unsigned long s3c2412_clk_regs[] __initdata = {
|
|
LOCKTIME,
|
|
MPLLCON,
|
|
UPLLCON,
|
|
CLKCON,
|
|
CLKDIVN,
|
|
CLKSRC,
|
|
};
|
|
|
|
static int s3c2412_clk_suspend(void)
|
|
{
|
|
samsung_clk_save(reg_base, s3c2412_save,
|
|
ARRAY_SIZE(s3c2412_clk_regs));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void s3c2412_clk_resume(void)
|
|
{
|
|
samsung_clk_restore(reg_base, s3c2412_save,
|
|
ARRAY_SIZE(s3c2412_clk_regs));
|
|
}
|
|
|
|
static struct syscore_ops s3c2412_clk_syscore_ops = {
|
|
.suspend = s3c2412_clk_suspend,
|
|
.resume = s3c2412_clk_resume,
|
|
};
|
|
|
|
static void s3c2412_clk_sleep_init(void)
|
|
{
|
|
s3c2412_save = samsung_clk_alloc_reg_dump(s3c2412_clk_regs,
|
|
ARRAY_SIZE(s3c2412_clk_regs));
|
|
if (!s3c2412_save) {
|
|
pr_warn("%s: failed to allocate sleep save data, no sleep support!\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
register_syscore_ops(&s3c2412_clk_syscore_ops);
|
|
return;
|
|
}
|
|
#else
|
|
static void s3c2412_clk_sleep_init(void) {}
|
|
#endif
|
|
|
|
static struct clk_div_table divxti_d[] = {
|
|
{ .val = 0, .div = 1 },
|
|
{ .val = 1, .div = 2 },
|
|
{ .val = 2, .div = 4 },
|
|
{ .val = 3, .div = 6 },
|
|
{ .val = 4, .div = 8 },
|
|
{ .val = 5, .div = 10 },
|
|
{ .val = 6, .div = 12 },
|
|
{ .val = 7, .div = 14 },
|
|
{ /* sentinel */ },
|
|
};
|
|
|
|
struct samsung_div_clock s3c2412_dividers[] __initdata = {
|
|
DIV_T(0, "div_xti", "xti", CLKSRC, 0, 3, divxti_d),
|
|
DIV(0, "div_cam", "mux_cam", CLKDIVN, 16, 4),
|
|
DIV(0, "div_i2s", "mux_i2s", CLKDIVN, 12, 4),
|
|
DIV(0, "div_uart", "mux_uart", CLKDIVN, 8, 4),
|
|
DIV(0, "div_usb", "mux_usb", CLKDIVN, 6, 1),
|
|
DIV(0, "div_hclk_half", "hclk", CLKDIVN, 5, 1),
|
|
DIV(ARMDIV, "armdiv", "msysclk", CLKDIVN, 3, 1),
|
|
DIV(PCLK, "pclk", "hclk", CLKDIVN, 2, 1),
|
|
DIV(HCLK, "hclk", "armdiv", CLKDIVN, 0, 2),
|
|
};
|
|
|
|
struct samsung_fixed_factor_clock s3c2412_ffactor[] __initdata = {
|
|
FFACTOR(0, "ff_hclk", "hclk", 2, 1, CLK_SET_RATE_PARENT),
|
|
};
|
|
|
|
/*
|
|
* The first two use the OM[4] setting, which is not readable from
|
|
* software, so assume it is set to xti.
|
|
*/
|
|
PNAME(erefclk_p) = { "xti", "xti", "xti", "ext" };
|
|
PNAME(urefclk_p) = { "xti", "xti", "xti", "ext" };
|
|
|
|
PNAME(camclk_p) = { "usysclk", "hclk" };
|
|
PNAME(usbclk_p) = { "usysclk", "hclk" };
|
|
PNAME(i2sclk_p) = { "erefclk", "mpll" };
|
|
PNAME(uartclk_p) = { "erefclk", "mpll" };
|
|
PNAME(usysclk_p) = { "urefclk", "upll" };
|
|
PNAME(msysclk_p) = { "mdivclk", "mpll" };
|
|
PNAME(mdivclk_p) = { "xti", "div_xti" };
|
|
PNAME(armclk_p) = { "armdiv", "hclk" };
|
|
|
|
struct samsung_mux_clock s3c2412_muxes[] __initdata = {
|
|
MUX(0, "erefclk", erefclk_p, CLKSRC, 14, 2),
|
|
MUX(0, "urefclk", urefclk_p, CLKSRC, 12, 2),
|
|
MUX(0, "mux_cam", camclk_p, CLKSRC, 11, 1),
|
|
MUX(0, "mux_usb", usbclk_p, CLKSRC, 10, 1),
|
|
MUX(0, "mux_i2s", i2sclk_p, CLKSRC, 9, 1),
|
|
MUX(0, "mux_uart", uartclk_p, CLKSRC, 8, 1),
|
|
MUX(USYSCLK, "usysclk", usysclk_p, CLKSRC, 5, 1),
|
|
MUX(MSYSCLK, "msysclk", msysclk_p, CLKSRC, 4, 1),
|
|
MUX(MDIVCLK, "mdivclk", mdivclk_p, CLKSRC, 3, 1),
|
|
MUX(ARMCLK, "armclk", armclk_p, CLKDIVN, 4, 1),
|
|
};
|
|
|
|
static struct samsung_pll_clock s3c2412_plls[] __initdata = {
|
|
[mpll] = PLL(pll_s3c2440_mpll, MPLL, "mpll", "xti",
|
|
LOCKTIME, MPLLCON, NULL),
|
|
[upll] = PLL(pll_s3c2410_upll, UPLL, "upll", "urefclk",
|
|
LOCKTIME, UPLLCON, NULL),
|
|
};
|
|
|
|
struct samsung_gate_clock s3c2412_gates[] __initdata = {
|
|
GATE(PCLK_WDT, "wdt", "pclk", CLKCON, 28, 0, 0),
|
|
GATE(PCLK_SPI, "spi", "pclk", CLKCON, 27, 0, 0),
|
|
GATE(PCLK_I2S, "i2s", "pclk", CLKCON, 26, 0, 0),
|
|
GATE(PCLK_I2C, "i2c", "pclk", CLKCON, 25, 0, 0),
|
|
GATE(PCLK_ADC, "adc", "pclk", CLKCON, 24, 0, 0),
|
|
GATE(PCLK_RTC, "rtc", "pclk", CLKCON, 23, 0, 0),
|
|
GATE(PCLK_GPIO, "gpio", "pclk", CLKCON, 22, CLK_IGNORE_UNUSED, 0),
|
|
GATE(PCLK_UART2, "uart2", "pclk", CLKCON, 21, 0, 0),
|
|
GATE(PCLK_UART1, "uart1", "pclk", CLKCON, 20, 0, 0),
|
|
GATE(PCLK_UART0, "uart0", "pclk", CLKCON, 19, 0, 0),
|
|
GATE(PCLK_SDI, "sdi", "pclk", CLKCON, 18, 0, 0),
|
|
GATE(PCLK_PWM, "pwm", "pclk", CLKCON, 17, 0, 0),
|
|
GATE(PCLK_USBD, "usb-device", "pclk", CLKCON, 16, 0, 0),
|
|
GATE(SCLK_CAM, "sclk_cam", "div_cam", CLKCON, 15, 0, 0),
|
|
GATE(SCLK_UART, "sclk_uart", "div_uart", CLKCON, 14, 0, 0),
|
|
GATE(SCLK_I2S, "sclk_i2s", "div_i2s", CLKCON, 13, 0, 0),
|
|
GATE(SCLK_USBH, "sclk_usbh", "div_usb", CLKCON, 12, 0, 0),
|
|
GATE(SCLK_USBD, "sclk_usbd", "div_usb", CLKCON, 11, 0, 0),
|
|
GATE(HCLK_HALF, "hclk_half", "div_hclk_half", CLKCON, 10, CLK_IGNORE_UNUSED, 0),
|
|
GATE(HCLK_X2, "hclkx2", "ff_hclk", CLKCON, 9, CLK_IGNORE_UNUSED, 0),
|
|
GATE(HCLK_SDRAM, "sdram", "hclk", CLKCON, 8, CLK_IGNORE_UNUSED, 0),
|
|
GATE(HCLK_USBH, "usb-host", "hclk", CLKCON, 6, 0, 0),
|
|
GATE(HCLK_LCD, "lcd", "hclk", CLKCON, 5, 0, 0),
|
|
GATE(HCLK_NAND, "nand", "hclk", CLKCON, 4, 0, 0),
|
|
GATE(HCLK_DMA3, "dma3", "hclk", CLKCON, 3, CLK_IGNORE_UNUSED, 0),
|
|
GATE(HCLK_DMA2, "dma2", "hclk", CLKCON, 2, CLK_IGNORE_UNUSED, 0),
|
|
GATE(HCLK_DMA1, "dma1", "hclk", CLKCON, 1, CLK_IGNORE_UNUSED, 0),
|
|
GATE(HCLK_DMA0, "dma0", "hclk", CLKCON, 0, CLK_IGNORE_UNUSED, 0),
|
|
};
|
|
|
|
struct samsung_clock_alias s3c2412_aliases[] __initdata = {
|
|
ALIAS(PCLK_UART0, "s3c2412-uart.0", "uart"),
|
|
ALIAS(PCLK_UART1, "s3c2412-uart.1", "uart"),
|
|
ALIAS(PCLK_UART2, "s3c2412-uart.2", "uart"),
|
|
ALIAS(PCLK_UART0, "s3c2412-uart.0", "clk_uart_baud2"),
|
|
ALIAS(PCLK_UART1, "s3c2412-uart.1", "clk_uart_baud2"),
|
|
ALIAS(PCLK_UART2, "s3c2412-uart.2", "clk_uart_baud2"),
|
|
ALIAS(SCLK_UART, NULL, "clk_uart_baud3"),
|
|
ALIAS(PCLK_I2C, "s3c2410-i2c.0", "i2c"),
|
|
ALIAS(PCLK_ADC, NULL, "adc"),
|
|
ALIAS(PCLK_RTC, NULL, "rtc"),
|
|
ALIAS(PCLK_PWM, NULL, "timers"),
|
|
ALIAS(HCLK_LCD, NULL, "lcd"),
|
|
ALIAS(PCLK_USBD, NULL, "usb-device"),
|
|
ALIAS(SCLK_USBD, NULL, "usb-bus-gadget"),
|
|
ALIAS(HCLK_USBH, NULL, "usb-host"),
|
|
ALIAS(SCLK_USBH, NULL, "usb-bus-host"),
|
|
ALIAS(ARMCLK, NULL, "armclk"),
|
|
ALIAS(HCLK, NULL, "hclk"),
|
|
ALIAS(MPLL, NULL, "mpll"),
|
|
ALIAS(MSYSCLK, NULL, "fclk"),
|
|
};
|
|
|
|
static int s3c2412_restart(struct notifier_block *this,
|
|
unsigned long mode, void *cmd)
|
|
{
|
|
/* errata "Watch-dog/Software Reset Problem" specifies that
|
|
* this reset must be done with the SYSCLK sourced from
|
|
* EXTCLK instead of FOUT to avoid a glitch in the reset
|
|
* mechanism.
|
|
*
|
|
* See the watchdog section of the S3C2412 manual for more
|
|
* information on this fix.
|
|
*/
|
|
|
|
__raw_writel(0x00, reg_base + CLKSRC);
|
|
__raw_writel(0x533C2412, reg_base + SWRST);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block s3c2412_restart_handler = {
|
|
.notifier_call = s3c2412_restart,
|
|
.priority = 129,
|
|
};
|
|
|
|
/*
|
|
* fixed rate clocks generated outside the soc
|
|
* Only necessary until the devicetree-move is complete
|
|
*/
|
|
#define XTI 1
|
|
struct samsung_fixed_rate_clock s3c2412_common_frate_clks[] __initdata = {
|
|
FRATE(XTI, "xti", NULL, CLK_IS_ROOT, 0),
|
|
FRATE(0, "ext", NULL, CLK_IS_ROOT, 0),
|
|
};
|
|
|
|
static void __init s3c2412_common_clk_register_fixed_ext(
|
|
struct samsung_clk_provider *ctx,
|
|
unsigned long xti_f, unsigned long ext_f)
|
|
{
|
|
/* xtal alias is necessary for the current cpufreq driver */
|
|
struct samsung_clock_alias xti_alias = ALIAS(XTI, NULL, "xtal");
|
|
|
|
s3c2412_common_frate_clks[0].fixed_rate = xti_f;
|
|
s3c2412_common_frate_clks[1].fixed_rate = ext_f;
|
|
samsung_clk_register_fixed_rate(ctx, s3c2412_common_frate_clks,
|
|
ARRAY_SIZE(s3c2412_common_frate_clks));
|
|
|
|
samsung_clk_register_alias(ctx, &xti_alias, 1);
|
|
}
|
|
|
|
void __init s3c2412_common_clk_init(struct device_node *np, unsigned long xti_f,
|
|
unsigned long ext_f, 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)
|
|
s3c2412_common_clk_register_fixed_ext(ctx, xti_f, ext_f);
|
|
|
|
/* Register PLLs. */
|
|
samsung_clk_register_pll(ctx, s3c2412_plls, ARRAY_SIZE(s3c2412_plls),
|
|
reg_base);
|
|
|
|
/* Register common internal clocks. */
|
|
samsung_clk_register_mux(ctx, s3c2412_muxes, ARRAY_SIZE(s3c2412_muxes));
|
|
samsung_clk_register_div(ctx, s3c2412_dividers,
|
|
ARRAY_SIZE(s3c2412_dividers));
|
|
samsung_clk_register_gate(ctx, s3c2412_gates,
|
|
ARRAY_SIZE(s3c2412_gates));
|
|
samsung_clk_register_fixed_factor(ctx, s3c2412_ffactor,
|
|
ARRAY_SIZE(s3c2412_ffactor));
|
|
samsung_clk_register_alias(ctx, s3c2412_aliases,
|
|
ARRAY_SIZE(s3c2412_aliases));
|
|
|
|
s3c2412_clk_sleep_init();
|
|
|
|
samsung_clk_of_add_provider(np, ctx);
|
|
|
|
ret = register_restart_handler(&s3c2412_restart_handler);
|
|
if (ret)
|
|
pr_warn("cannot register restart handler, %d\n", ret);
|
|
}
|
|
|
|
static void __init s3c2412_clk_init(struct device_node *np)
|
|
{
|
|
s3c2412_common_clk_init(np, 0, 0, 0);
|
|
}
|
|
CLK_OF_DECLARE(s3c2412_clk, "samsung,s3c2412-clock", s3c2412_clk_init);
|