From: Pavel Fedin <p.fedin@samsung.com>
To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>, Kukjin Kim <kgene@kernel.org>,
Krzysztof Kozlowski <k.kozlowski@samsung.com>
Subject: [PATCH v5 3/4] drivers: exynos-srom: Add support for bank configuration
Date: Tue, 03 Nov 2015 12:16:40 +0300 [thread overview]
Message-ID: <72fa025c634fa477b1d7a89c254bd3c9c43f2b27.1446542020.git.p.fedin@samsung.com> (raw)
In-Reply-To: <cover.1446542020.git.p.fedin@samsung.com>
In-Reply-To: <cover.1446542020.git.p.fedin@samsung.com>
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>
---
arch/arm/mach-exynos/Kconfig | 2 +-
drivers/soc/samsung/Kconfig | 2 +-
drivers/soc/samsung/exynos-srom.c | 60 +++++++++++++++++++++++++++++++++++++--
3 files changed, 60 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 83c85f5..c22dc42 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -16,7 +16,7 @@ menuconfig ARCH_EXYNOS
select ARM_GIC
select COMMON_CLK_SAMSUNG
select EXYNOS_THERMAL
- 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
diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig
index 2833b5b..ea4bc2a 100644
--- a/drivers/soc/samsung/Kconfig
+++ b/drivers/soc/samsung/Kconfig
@@ -8,6 +8,6 @@ config SOC_SAMSUNG
config EXYNOS_SROM
bool
- depends on ARM && ARCH_EXYNOS && PM
+ depends on ARM && ARCH_EXYNOS
endmenu
diff --git a/drivers/soc/samsung/exynos-srom.c b/drivers/soc/samsung/exynos-srom.c
index 57a232d..49b5c9e 100644
--- a/drivers/soc/samsung/exynos-srom.c
+++ b/drivers/soc/samsung/exynos-srom.c
@@ -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 decode_sromc(struct exynos_srom *srom, struct device_node *np)
+{
+ u32 bank, width, pmc;
+ 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_u32(np, "samsung,srom-page-mode", &pmc))
+ pmc = 0;
+ 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 << EXYNOS_SROM_BCX__PMC__SHIFT) |
+ (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 error = 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 (decode_sromc(srom, child)) {
+ dev_err(dev,
+ "Could not decode bank configuration for %s\n",
+ child->name);
+ error = true;
+ }
+ }
+
+ /*
+ * If any bank failed to configure, we still provide suspend/resume,
+ * but do not probe child devices
+ */
+ if (error)
+ return 0;
+
+ return of_platform_populate(np, NULL, NULL, dev);
}
static int exynos_srom_remove(struct platform_device *pdev)
--
2.4.4
next prev parent reply other threads:[~2015-11-03 9:17 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-03 9:16 [PATCH v5 0/4] Exynos SROMc configuration and Ethernet support for SMDK5410 Pavel Fedin
2015-11-03 9:16 ` [PATCH v5 1/4] Documentation: dt-bindings: Describe SROMc configuration Pavel Fedin
2015-11-04 8:09 ` Krzysztof Kozlowski
2015-11-03 9:16 ` [PATCH v5 2/4] ARM: dts: Add SROMc to Exynos 5410 Pavel Fedin
2015-11-04 8:12 ` Krzysztof Kozlowski
2015-11-03 9:16 ` Pavel Fedin [this message]
2015-11-04 8:20 ` [PATCH v5 3/4] drivers: exynos-srom: Add support for bank configuration Krzysztof Kozlowski
2015-11-05 10:40 ` Pavel Fedin
2015-11-05 11:09 ` Krzysztof Kozlowski
2015-11-03 9:16 ` [PATCH v5 4/4] ARM: dts: Add Ethernet chip to SMDK5410 Pavel Fedin
2015-11-04 8:28 ` Krzysztof Kozlowski
2015-11-05 11:14 ` Pavel Fedin
2015-11-05 11:27 ` Krzysztof Kozlowski
2015-11-05 11:36 ` Pavel Fedin
2015-11-04 7:36 ` [PATCH v5 0/4] Exynos SROMc configuration and Ethernet support for SMDK5410 Krzysztof Kozlowski
2015-11-05 7:59 ` Pavel Fedin
2015-11-05 8:07 ` Krzysztof Kozlowski
2015-11-05 8:44 ` Pavel Fedin
2015-11-05 8:51 ` Krzysztof Kozlowski
2015-11-05 9:00 ` Pavel Fedin
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