From 8ac2266d88318d348fa5f1dad5b525e0d2c665ef Mon Sep 17 00:00:00 2001 From: Pavel Fedin Date: Mon, 11 Apr 2016 13:12:27 +0530 Subject: [PATCH] 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: Pavel Fedin Reviewed-by: Krzysztof Kozlowski Signed-off-by: Pankaj Dubey Signed-off-by: Krzysztof Kozlowski --- arch/arm/mach-exynos/Kconfig | 2 +- drivers/memory/samsung/Kconfig | 2 +- drivers/memory/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 28f992886d67..e65aa7d11b20 100644 --- a/arch/arm/mach-exynos/Kconfig +++ b/arch/arm/mach-exynos/Kconfig @@ -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 diff --git a/drivers/memory/samsung/Kconfig b/drivers/memory/samsung/Kconfig index 64ab5dd9f626..9de12222061c 100644 --- a/drivers/memory/samsung/Kconfig +++ b/drivers/memory/samsung/Kconfig @@ -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 diff --git a/drivers/memory/samsung/exynos-srom.c b/drivers/memory/samsung/exynos-srom.c index 68e073c1651c..96756fb4d6bd 100644 --- a/drivers/memory/samsung/exynos-srom.c +++ b/drivers/memory/samsung/exynos-srom.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -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) -- 2.20.1