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ARM: highbank: abstract out SCU usage 

In preparation for A15 support on ECX-2000, the direct calls to SCU
registers must be conditional. The SCU power mode register is replaced by
a custom register on ECX-2000.

Rather than read the number of cores from the SCU, just hardcode it to 4.
This removes one use of SCU and removes the need for the SCU to be
statically mapped. The cpu initialization will ultimately come from DT.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Rob Herring 2012-10-25 12:13:47 -05:00
parent 0336517b38
commit 7a2848d369
6 changed files with 29 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
arch/arm/mach-highbank/highbank.c
View File

@ -28,30 +28,19 @@
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <asm/smp_twd.h>
#include <asm/hardware/arm_timer.h>
#include <asm/hardware/timer-sp.h>
#include <asm/hardware/gic.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
#include "core.h"
#include "sysregs.h"
void __iomem *sregs_base;
#define HB_SCU_VIRT_BASE 0xfee00000
void __iomem *scu_base_addr = ((void __iomem *)(HB_SCU_VIRT_BASE));
static struct map_desc scu_io_desc __initdata = {
.virtual = HB_SCU_VIRT_BASE,
.pfn = 0, /* run-time */
.length = SZ_4K,
.type = MT_DEVICE,
};
void __iomem *scu_base_addr;
static void __init highbank_scu_map_io(void)
{
@ -60,13 +49,11 @@ static void __init highbank_scu_map_io(void)
/* Get SCU base */
asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
scu_io_desc.pfn = __phys_to_pfn(base);
iotable_init(&scu_io_desc, 1);
scu_base_addr = ioremap(base, SZ_4K);
}
static void __init highbank_map_io(void)
{
highbank_scu_map_io();
highbank_lluart_map_io();
}
@ -99,6 +86,9 @@ static void __init highbank_init_irq(void)
{
of_irq_init(irq_match);
if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
highbank_scu_map_io();
#ifdef CONFIG_CACHE_L2X0
/* Enable PL310 L2 Cache controller */
highbank_smc1(0x102, 0x1);
@ -145,7 +135,6 @@ static struct sys_timer highbank_timer = {
static void highbank_power_off(void)
{
hignbank_set_pwr_shutdown();
scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
while (1)
cpu_do_idle();

6
arch/arm/mach-highbank/hotplug.c
View File

@ -14,13 +14,11 @@
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <asm/smp_scu.h>
#include <asm/cacheflush.h>
#include "core.h"
#include "sysregs.h"
extern void secondary_startup(void);
@ -33,7 +31,7 @@ void __ref highbank_cpu_die(unsigned int cpu)
flush_cache_all();
highbank_set_cpu_jump(cpu, secondary_startup);
scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
highbank_set_core_pwr();
cpu_do_idle();

7
arch/arm/mach-highbank/platsmp.c
View File

@ -42,9 +42,7 @@ static int __cpuinit highbank_boot_secondary(unsigned int cpu, struct task_struc
*/
static void __init highbank_smp_init_cpus(void)
{
unsigned int i, ncores;
ncores = scu_get_core_count(scu_base_addr);
unsigned int i, ncores = 4;
/* sanity check */
if (ncores > NR_CPUS) {
@ -65,7 +63,8 @@ static void __init highbank_smp_prepare_cpus(unsigned int max_cpus)
{
int i;
scu_enable(scu_base_addr);
if (scu_base_addr)
scu_enable(scu_base_addr);
/*
* Write the address of secondary startup into the jump table

3
arch/arm/mach-highbank/pm.c
View File

@ -19,7 +19,6 @@
#include <linux/suspend.h>
#include <asm/proc-fns.h>
#include <asm/smp_scu.h>
#include <asm/suspend.h>
#include "core.h"
@ -35,8 +34,6 @@ static int highbank_pm_enter(suspend_state_t state)
{
hignbank_set_pwr_suspend();
highbank_set_cpu_jump(0, cpu_resume);
scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
cpu_suspend(0, highbank_suspend_finish);
return 0;

19
arch/arm/mach-highbank/sysregs.h
View File

@ -17,6 +17,10 @@
#define _MACH_HIGHBANK__SYSREGS_H_
#include <linux/io.h>
#include <linux/smp.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include "core.h"
extern void __iomem *sregs_base;
@ -29,24 +33,39 @@ extern void __iomem *sregs_base;
#define HB_PWR_HARD_RESET 2
#define HB_PWR_SHUTDOWN 3
#define SREG_CPU_PWR_CTRL(c) (0x200 + ((c) * 4))
static inline void highbank_set_core_pwr(void)
{
int cpu = cpu_logical_map(smp_processor_id());
if (scu_base_addr)
scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
else
writel_relaxed(1, sregs_base + SREG_CPU_PWR_CTRL(cpu));
}
static inline void hignbank_set_pwr_suspend(void)
{
writel(HB_PWR_SUSPEND, sregs_base + HB_SREG_A9_PWR_REQ);
highbank_set_core_pwr();
}
static inline void hignbank_set_pwr_shutdown(void)
{
writel(HB_PWR_SHUTDOWN, sregs_base + HB_SREG_A9_PWR_REQ);
highbank_set_core_pwr();
}
static inline void hignbank_set_pwr_soft_reset(void)
{
writel(HB_PWR_SOFT_RESET, sregs_base + HB_SREG_A9_PWR_REQ);
highbank_set_core_pwr();
}
static inline void hignbank_set_pwr_hard_reset(void)
{
writel(HB_PWR_HARD_RESET, sregs_base + HB_SREG_A9_PWR_REQ);
highbank_set_core_pwr();
}
#endif

2
arch/arm/mach-highbank/system.c
View File

@ -14,7 +14,6 @@
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/io.h>
#include <asm/smp_scu.h>
#include <asm/proc-fns.h>
#include "core.h"
@ -27,7 +26,6 @@ void highbank_restart(char mode, const char *cmd)
else
hignbank_set_pwr_soft_reset();
scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
cpu_do_idle();
}