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rtc: dw: Add support for optional clock gating

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Clock gating is platform specific and not mandatory. Thus making in
Kconfig based as well as generic.

Change-Id: I01b7831536efd87cc66a95060fcf1faf4a340073
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This commit is contained in:
Tomasz Bursztyka 2015-12-03 13:49:45 +01:00 • committed by Anas Nashif
commit 61c15ba1e1
6 changed files with 73 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

1
arch/x86/platforms/quark_d2000/board.h
View file

@ -136,7 +136,6 @@ struct scss_interrupt {
/* RTC */
#define RTC_DW_INT_MASK (SCSS_INT_BASE + 0x78)
#define CCU_RTC_CLK_DIV_OFFSET 0x3
#define CCU_RTC_PCLK_EN_SW (1 << 11)

6
arch/x86/platforms/quark_se/Kconfig
View file

@ -179,6 +179,12 @@ endif
if RTC
config RTC_DW
def_bool y
config RTC_DW_CLOCK_GATE
def_bool n
config RTC_DW_CLOCK_GATE_DRV_NAME
default CLOCK_CONTROL_QUARK_SE_PERIPHERAL_DRV_NAME
config RTC_DW_CLOCK_GATE_SUBSYS
default 11
config RTC_DW_BASE_ADDR
default 0xB0000400
config RTC_DW_IRQ

1
arch/x86/platforms/quark_se/board.h
View file

@ -227,7 +227,6 @@ struct scss_interrupt {
/* RTC */
#define RTC_DW_INT_MASK (SCSS_INT_BASE + 0x78)
#define CCU_RTC_CLK_DIV_OFFSET (3)
#define CCU_RTC_PCLK_EN_SW (1 << 11)
/* Clock */
#define CLOCK_PERIPHERAL_BASE_ADDR (SCSS_REGISTER_BASE + 0x18)

18
drivers/rtc/Kconfig
View file

@ -40,6 +40,24 @@ config RTC_DW_DRV_NAME
help
Designware RTC driver instance name
config RTC_DW_CLOCK_GATE
bool "Enable clock gating"
depends on RTC_DW
select CLOCK_CONTROL
default n
help
Enable clock gating on RTC DesignWare controller
config RTC_DW_CLOCK_GATE_DRV_NAME
string "Clock gating driver name"
depends on RTC_DW_CLOCK_GATE
default ""
config RTC_DW_CLOCK_GATE_SUBSYS
int "Clock controller's subsystem"
depends on RTC_DW_CLOCK_GATE
default 0
config RTC_DW_BASE_ADDR
hex "Base address"
depends on RTC_DW

50
drivers/rtc/rtc_dw.c
View file

@ -19,6 +19,7 @@
#include <stdio.h>
#include <rtc.h>
#include <init.h>
#include <clock_control.h>
#include "board.h"
#include "rtc_dw.h"
@ -36,6 +37,41 @@ static inline void _rtc_dw_int_unmask(void)
#define _rtc_dw_int_unmask()
#endif
#ifdef CONFIG_RTC_DW_CLOCK_GATE
static inline void _rtc_dw_clock_config(struct device *dev)
{
char *drv = CONFIG_RTC_DW_CLOCK_GATE_DRV_NAME;
struct device *clk;
clk = device_get_binding(drv);
if (clk) {
struct rtc_dw_runtime *context = dev->driver_data;
context->clock = clk;
}
}
static inline void _rtc_dw_clock_on(struct device *dev)
{
struct rtc_dw_dev_config *config = dev->config->config_info;
struct rtc_dw_runtime *context = dev->driver_data;
clock_control_on(context->clock, config->clock_data);
}
static inline void _rtc_dw_clock_off(struct device *dev)
{
struct rtc_dw_dev_config *config = dev->config->config_info;
struct rtc_dw_runtime *context = dev->driver_data;
clock_control_off(context->clock, config->clock_data);
}
#else
#define _rtc_dw_clock_config(...)
#define _rtc_dw_clock_on(...)
#define _rtc_dw_clock_off(...)
#endif
static void rtc_dw_set_div(const enum clk_rtc_div div)
{
/* set default division mask */
@ -53,10 +89,7 @@ static void rtc_dw_set_div(const enum clk_rtc_div div)
*/
static void rtc_dw_enable(struct device *dev)
{
ARG_UNUSED(dev);
sys_set_bit(CLOCK_PERIPHERAL_BASE_ADDR, 11);
sys_set_bit(CLOCK_PERIPHERAL_BASE_ADDR, 1);
_rtc_dw_clock_on(dev);
}
/**
@ -65,9 +98,7 @@ static void rtc_dw_enable(struct device *dev)
*/
static void rtc_dw_disable(struct device *dev)
{
ARG_UNUSED(dev);
sys_clear_bit(CLOCK_PERIPHERAL_BASE_ADDR, 11);
_rtc_dw_clock_off(dev);
}
/**
@ -169,6 +200,8 @@ int rtc_dw_init(struct device *dev)
_rtc_dw_int_unmask();
_rtc_dw_clock_config(dev);
dev->driver_api = &funcs;
return DEV_OK;
@ -178,6 +211,9 @@ struct rtc_dw_runtime rtc_runtime;
struct rtc_dw_dev_config rtc_dev = {
.base_address = CONFIG_RTC_DW_BASE_ADDR,
#ifdef CONFIG_RTC_DW_CLOCK_GATE
.clock_data = UINT_TO_POINTER(CONFIG_RTC_DW_CLOCK_GATE_SUBSYS),
#endif
};
DECLARE_DEVICE_INIT_CONFIG(rtc, CONFIG_RTC_DW_DRV_NAME,

6
drivers/rtc/rtc_dw.h
View file

@ -44,10 +44,16 @@
struct rtc_dw_runtime {
void (*rtc_dw_cb_fn)(struct device *dev);
#ifdef CONFIG_RTC_DW_CLOCK_GATE
struct device *clock;
#endif
};
struct rtc_dw_dev_config {
uint32_t base_address;
#ifdef CONFIG_RTC_DW_CLOCK_GATE
void *clock_data;
#endif
};
int rtc_dw_init(struct device *dev);