提交 8ac2266d 编写于 作者: P Pavel Fedin 提交者: Krzysztof Kozlowski

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

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: NPavel Fedin <p.fedin@samsung.com>
Reviewed-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NPankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
上级 5901f4c2
......@@ -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
......
......@@ -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
......@@ -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)
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册