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memory: samsung: exynos-srom: Add support for bank configuration

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Implement handling properties in subnodes and adding child devices to the
system. Child devices will not be added if configuration fails.

Since the driver now does more than suspend-resume support, dependency on
CONFIG_PM is removed.

Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This commit is contained in:
Pavel Fedin 2016-04-11 13:12:27 +05:30 committed by Krzysztof Kozlowski
parent 5901f4c279
commit 8ac2266d88
3 changed files with 60 additions and 4 deletions
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2
arch/arm/mach-exynos/Kconfig
View file

@ -18,7 +18,7 @@ menuconfig ARCH_EXYNOS
select COMMON_CLK_SAMSUNG
select EXYNOS_THERMAL
select EXYNOS_PMU
select EXYNOS_SROM if PM
select EXYNOS_SROM
select HAVE_ARM_SCU if SMP
select HAVE_S3C2410_I2C if I2C
select HAVE_S3C2410_WATCHDOG if WATCHDOG

2
drivers/memory/samsung/Kconfig
View file

@ -8,6 +8,6 @@ if SAMSUNG_MC
config EXYNOS_SROM
bool "Exynos SROM controller driver" if COMPILE_TEST
depends on (ARM && ARCH_EXYNOS && PM) || (COMPILE_TEST && HAS_IOMEM)
depends on (ARM && ARCH_EXYNOS) || (COMPILE_TEST && HAS_IOMEM)
endif

60
drivers/memory/samsung/exynos-srom.c
View file

@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@ -67,11 +68,50 @@ static struct exynos_srom_reg_dump *exynos_srom_alloc_reg_dump(
return rd;
}
static int exynos_srom_configure_bank(struct exynos_srom *srom,
struct device_node *np)
{
u32 bank, width, pmc = 0;
u32 timing[6];
u32 cs, bw;
if (of_property_read_u32(np, "reg", &bank))
return -EINVAL;
if (of_property_read_u32(np, "reg-io-width", &width))
width = 1;
if (of_property_read_bool(np, "samsung,srom-page-mode"))
pmc = 1 << EXYNOS_SROM_BCX__PMC__SHIFT;
if (of_property_read_u32_array(np, "samsung,srom-timing", timing,
ARRAY_SIZE(timing)))
return -EINVAL;
bank *= 4; /* Convert bank into shift/offset */
cs = 1 << EXYNOS_SROM_BW__BYTEENABLE__SHIFT;
if (width == 2)
cs |= 1 << EXYNOS_SROM_BW__DATAWIDTH__SHIFT;
bw = __raw_readl(srom->reg_base + EXYNOS_SROM_BW);
bw = (bw & ~(EXYNOS_SROM_BW__CS_MASK << bank)) | (cs << bank);
__raw_writel(bw, srom->reg_base + EXYNOS_SROM_BW);
__raw_writel(pmc | (timing[0] << EXYNOS_SROM_BCX__TACP__SHIFT) |
(timing[1] << EXYNOS_SROM_BCX__TCAH__SHIFT) |
(timing[2] << EXYNOS_SROM_BCX__TCOH__SHIFT) |
(timing[3] << EXYNOS_SROM_BCX__TACC__SHIFT) |
(timing[4] << EXYNOS_SROM_BCX__TCOS__SHIFT) |
(timing[5] << EXYNOS_SROM_BCX__TACS__SHIFT),
srom->reg_base + EXYNOS_SROM_BC0 + bank);
return 0;
}
static int exynos_srom_probe(struct platform_device *pdev)
{
struct device_node *np;
struct device_node *np, *child;
struct exynos_srom *srom;
struct device *dev = &pdev->dev;
bool bad_bank_config = false;
np = dev->of_node;
if (!np) {
@ -100,7 +140,23 @@ static int exynos_srom_probe(struct platform_device *pdev)
return -ENOMEM;
}
return 0;
for_each_child_of_node(np, child) {
if (exynos_srom_configure_bank(srom, child)) {
dev_err(dev,
"Could not decode bank configuration for %s\n",
child->name);
bad_bank_config = true;
}
}
/*
* If any bank failed to configure, we still provide suspend/resume,
* but do not probe child devices
*/
if (bad_bank_config)
return 0;
return of_platform_populate(np, NULL, NULL, dev);
}
static int exynos_srom_remove(struct platform_device *pdev)