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ARM: at91: pm: use the mmio-sram pool to access SRAM 

Now that the SRAM is part of a genpool, use it to allocate memory to use for the
slowclock implementation.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Alexandre Belloni 2015-01-15 15:59:25 +01:00 committed by Nicolas Ferre
parent f5598d346e
commit d2e4679055
2 changed files with 46 additions and 1 deletions
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1
arch/arm/mach-at91/Kconfig
View File

@ -178,6 +178,7 @@ comment "AT91 Feature Selections"
config AT91_SLOW_CLOCK
bool "Suspend-to-RAM disables main oscillator"
select SRAM
depends on SUSPEND
help
Select this if you want Suspend-to-RAM to save the most power

46
arch/arm/mach-at91/pm.c
View File

@ -14,10 +14,12 @@
#include <linux/suspend.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/genalloc.h>
#include <linux/interrupt.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk/at91_pmc.h>
@ -222,10 +224,52 @@ void at91_pm_set_standby(void (*at91_standby)(void))
}
}
#ifdef CONFIG_AT91_SLOW_CLOCK
static void __init at91_pm_sram_init(void)
{
struct gen_pool *sram_pool;
phys_addr_t sram_pbase;
unsigned long sram_base;
struct device_node *node;
struct platform_device *pdev;
node = of_find_compatible_node(NULL, NULL, "mmio-sram");
if (!node) {
pr_warn("%s: failed to find sram node!\n", __func__);
return;
}
pdev = of_find_device_by_node(node);
if (!pdev) {
pr_warn("%s: failed to find sram device!\n", __func__);
goto put_node;
}
sram_pool = dev_get_gen_pool(&pdev->dev);
if (!sram_pool) {
pr_warn("%s: sram pool unavailable!\n", __func__);
goto put_node;
}
sram_base = gen_pool_alloc(sram_pool, at91_slow_clock_sz);
if (!sram_base) {
pr_warn("%s: unable to alloc ocram!\n", __func__);
goto put_node;
}
sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
slow_clock = __arm_ioremap_exec(sram_pbase, at91_slow_clock_sz, false);
put_node:
of_node_put(node);
}
#endif
static int __init at91_pm_init(void)
{
#ifdef CONFIG_AT91_SLOW_CLOCK
slow_clock = (void *) (AT91_IO_VIRT_BASE - at91_slow_clock_sz);
at91_pm_sram_init();
#endif
pr_info("AT91: Power Management%s\n", (slow_clock ? " (with slow clock mode)" : ""));