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authorLinus Walleij <linus.walleij@linaro.org>2016-08-30 12:23:55 +0200
committerLinus Walleij <linus.walleij@linaro.org>2016-08-31 09:30:34 +0200
commitbdb249fce9ad44aab340be3b7a77060114f7193b (patch)
tree41da4891fb1ccd914eaef5d9b0bd1e6496d66d14 /arch/arm/mach-integrator
parentARM: integrator: cut down on static maps (diff)
downloadlinux-bdb249fce9ad44aab340be3b7a77060114f7193b.tar.xz
linux-bdb249fce9ad44aab340be3b7a77060114f7193b.zip
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>
Diffstat (limited to 'arch/arm/mach-integrator')
-rw-r--r--arch/arm/mach-integrator/integrator_cp.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/arch/arm/mach-integrator/integrator_cp.c b/arch/arm/mach-integrator/integrator_cp.c
index 8db029fa6052..772a7cf2010e 100644
--- a/arch/arm/mach-integrator/integrator_cp.c
+++ b/arch/arm/mach-integrator/integrator_cp.c
@@ -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);
}