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ARM: zynq: Split slcr in two parts 

Split the slcr into an early part for unlocking and cpu starting
and a later syscon driver.
Also add "syscon" compatible property for slcr.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2013-11-26 15:41:31 +01:00
parent 6f69c7f21c
commit 016f4dcae8
5 changed files with 30 additions and 4 deletions
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2
arch/arm/boot/dts/zynq-7000.dtsi
View File

@ -123,7 +123,7 @@
} ;
slcr: slcr@f8000000 {
compatible = "xlnx,zynq-slcr";
compatible = "xlnx,zynq-slcr", "syscon";
reg = <0xF8000000 0x1000>;
clocks {

1
arch/arm/mach-zynq/Kconfig
View File

@ -14,5 +14,6 @@ config ARCH_ZYNQ
select SPARSE_IRQ
select CADENCE_TTC_TIMER
select ARM_GLOBAL_TIMER
select MFD_SYSCON
help
Support for Xilinx Zynq ARM Cortex A9 Platform

4
arch/arm/mach-zynq/common.c
View File

@ -59,11 +59,13 @@ static void __init zynq_init_machine(void)
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
platform_device_register(&zynq_cpuidle_device);
zynq_slcr_init();
}
static void __init zynq_timer_init(void)
{
zynq_slcr_init();
zynq_early_slcr_init();
zynq_clock_init(zynq_slcr_base);
clocksource_of_init();

1
arch/arm/mach-zynq/common.h
View File

@ -20,6 +20,7 @@
void zynq_secondary_startup(void);
extern int zynq_slcr_init(void);
extern int zynq_early_slcr_init(void);
extern void zynq_slcr_system_reset(void);
extern void zynq_slcr_cpu_stop(int cpu);
extern void zynq_slcr_cpu_start(int cpu);

26
arch/arm/mach-zynq/slcr.c
View File

@ -15,7 +15,9 @@
*/
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/clk/zynq.h>
#include "common.h"
@ -30,6 +32,7 @@
#define SLCR_A9_CPU_RST 0x1
void __iomem *zynq_slcr_base;
static struct regmap *zynq_slcr_regmap;
/**
* zynq_slcr_system_reset - Reset the entire system.
@ -80,12 +83,31 @@ void zynq_slcr_cpu_stop(int cpu)
}
/**
* zynq_slcr_init
* Returns 0 on success, negative errno otherwise.
* zynq_slcr_init - Regular slcr driver init
*
* Return: 0 on success, negative errno otherwise.
*
* Called early during boot from platform code to remap SLCR area.
*/
int __init zynq_slcr_init(void)
{
zynq_slcr_regmap = syscon_regmap_lookup_by_compatible("xlnx,zynq-slcr");
if (IS_ERR(zynq_slcr_regmap)) {
pr_err("%s: failed to find zynq-slcr\n", __func__);
return -ENODEV;
}
return 0;
}
/**
* zynq_early_slcr_init - Early slcr init function
*
* Return: 0 on success, negative errno otherwise.
*
* Called very early during boot from platform code to unlock SLCR.
*/
int __init zynq_early_slcr_init(void)
{
struct device_node *np;