UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

ARM: integrator: read counter using syscon/regmap 

Look up the core module base address from the device tree and
register a sched_clock() using the regmap to the core module
on the Integrator/CP.

MFD_SYSCON is selected by the arch so it is always available.

This further makes it possible to remove one more static map.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2016-08-30 12:23:55 +02:00
parent 359a3d38e6
commit bdb249fce9
1 changed files with 14 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/arm/mach-integrator/integrator_cp.c
View File

@ -15,6 +15,8 @@
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/sched_clock.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
@ -23,12 +25,15 @@
#include "cm.h"
#include "common.h"
/* Base address to the core module header */
static struct regmap *cm_map;
/* Base address to the CP controller */
static void __iomem *intcp_con_base;
#define CM_COUNTER_OFFSET 0x28
/*
* Logical Physical
* f1000000 10000000 Core module registers
* f1400000 14000000 Interrupt controller
* f1600000 16000000 UART 0
* fca00000 ca000000 SIC
@ -36,11 +41,6 @@ static void __iomem *intcp_con_base;
static struct map_desc intcp_io_desc[] __initdata __maybe_unused = {
{
.virtual = IO_ADDRESS(INTEGRATOR_HDR_BASE),
.pfn = __phys_to_pfn(INTEGRATOR_HDR_BASE),
.length = SZ_4K,
.type = MT_DEVICE
}, {
.virtual = IO_ADDRESS(INTEGRATOR_IC_BASE),
.pfn = __phys_to_pfn(INTEGRATOR_IC_BASE),
.length = SZ_4K,
@ -84,15 +84,20 @@ static struct mmci_platform_data mmc_data = {
.gpio_cd = -1,
};
#define REFCOUNTER (__io_address(INTEGRATOR_HDR_BASE) + 0x28)
static u64 notrace intcp_read_sched_clock(void)
{
return readl(REFCOUNTER);
unsigned int val;
/* MMIO so discard return code */
regmap_read(cm_map, CM_COUNTER_OFFSET, &val);
return val;
}
static void __init intcp_init_early(void)
{
cm_map = syscon_regmap_lookup_by_compatible("arm,core-module-integrator");
if (IS_ERR(cm_map))
return;
sched_clock_register(intcp_read_sched_clock, 32, 24000000);
}