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Commit d2e46790 authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Nicolas Ferre
Browse files

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: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
parent f5598d34

arch/arm/mach-at91/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/mach-at91/pm.c

+45 −1
Original line number Diff line number Diff line
@@ -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)" : ""));