W dniu 29.04.2015 o 17:38, Pankaj Dubey pisze: > This patch adds Exynos SROM controller driver which will handle > save restore of SROM registers during S2R. > > Change-Id: Iaddaaebc1d7090c9889e948e68e886519562c43c Please remove it. > Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> > --- > drivers/soc/Kconfig | 1 + > drivers/soc/Makefile | 1 + > drivers/soc/samsung/Kconfig | 14 ++++ > drivers/soc/samsung/Makefile | 1 + > drivers/soc/samsung/exynos-srom.c | 142 ++++++++++++++++++++++++++++++++++++++ > drivers/soc/samsung/exynos-srom.h | 51 ++++++++++++++ > 6 files changed, 210 insertions(+) > create mode 100644 drivers/soc/samsung/Kconfig > create mode 100644 drivers/soc/samsung/Makefile > create mode 100644 drivers/soc/samsung/exynos-srom.c > create mode 100644 drivers/soc/samsung/exynos-srom.h > > diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig > index 76d6bd4..c3abfbe 100644 > --- a/drivers/soc/Kconfig > +++ b/drivers/soc/Kconfig > @@ -1,6 +1,7 @@ > menu "SOC (System On Chip) specific Drivers" > > source "drivers/soc/qcom/Kconfig" > +source "drivers/soc/samsung/Kconfig" > source "drivers/soc/ti/Kconfig" > source "drivers/soc/versatile/Kconfig" > > diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile > index 063113d..620366f 100644 > --- a/drivers/soc/Makefile > +++ b/drivers/soc/Makefile > @@ -3,6 +3,7 @@ > # > > obj-$(CONFIG_ARCH_QCOM) += qcom/ > +obj-$(CONFIG_SOC_SAMSUNG) += samsung/ > obj-$(CONFIG_ARCH_TEGRA) += tegra/ > obj-$(CONFIG_SOC_TI) += ti/ > obj-$(CONFIG_PLAT_VERSATILE) += versatile/ > diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig > new file mode 100644 > index 0000000..b6fa4e6 > --- /dev/null > +++ b/drivers/soc/samsung/Kconfig > @@ -0,0 +1,14 @@ > +# > +# SAMSUNG SoC drivers > +# > +menu "Samsung SOC driver support" > + > +config SOC_SAMSUNG > + bool Any reason for not using menuconfig? > + > +config EXYNOS_SROM > + bool > + depends on ARM && ARCH_EXYNOS > + select SOC_BUS Why we need to select SOC_BUS? > + > +endmenu > diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile > new file mode 100644 > index 0000000..9c554d5 > --- /dev/null > +++ b/drivers/soc/samsung/Makefile > @@ -0,0 +1 @@ > +obj-$(CONFIG_EXYNOS_SROM) += exynos-srom.o > diff --git a/drivers/soc/samsung/exynos-srom.c b/drivers/soc/samsung/exynos-srom.c > new file mode 100644 > index 0000000..8aae762 > --- /dev/null > +++ b/drivers/soc/samsung/exynos-srom.c > @@ -0,0 +1,142 @@ > +/* > + * Copyright (c) 2015 Samsung Electronics Co., Ltd. > + * http://www.samsung.com/ > + * > + * EXYNOS - SROM Controller support > + * Author: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + */ > + > +#include <linux/io.h> > +#include <linux/of.h> > +#include <linux/of_address.h> > +#include <linux/of_platform.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > +#include "exynos-srom.h" > + > +static void __iomem *exynos_srom_base; > + > +static unsigned long exynos_srom_offsets[] = { static const > + /* SROM side */ > + S5P_SROM_BW, > + S5P_SROM_BC0, > + S5P_SROM_BC1, > + S5P_SROM_BC2, > + S5P_SROM_BC3, > +}; > + > +/** > + * struct exynos_srom_reg_dump: register dump of SROM Controller registers. > + * @offset: srom register offset from the controller base address. > + * @value: the value to be register at offset. Maybe: @value: the value of register under the offset > + */ > +struct exynos_srom_reg_dump { > + u32 offset; > + u32 value; > +}; > + > +static struct exynos_srom_reg_dump *exynos_srom_regs; > + > +static struct exynos_srom_reg_dump *exynos_srom_alloc_reg_dump( > + const unsigned long *rdump, > + unsigned long nr_rdump) > +{ > + struct exynos_srom_reg_dump *rd; > + unsigned int i; > + > + rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL); > + if (!rd) > + return NULL; > + > + for (i = 0; i < nr_rdump; ++i) > + rd[i].offset = rdump[i]; > + > + return rd; > +} > + > +static void exynos_srom_save(void __iomem *base, > + struct exynos_srom_reg_dump *rd, > + unsigned int num_regs) > +{ > + for (; num_regs > 0; --num_regs, ++rd) > + rd->value = readl(base + rd->offset); > + > +} > + > +static void exynos_srom_restore(void __iomem *base, > + const struct exynos_srom_reg_dump *rd, > + unsigned int num_regs) > +{ > + for (; num_regs > 0; --num_regs, ++rd) > + writel(rd->value, base + rd->offset); > + > +} > + > +static const struct of_device_id of_exynos_srom_ids[] = { > + { > + .compatible = "samsung,exynos-srom", > + }, > + {}, > +}; > + > +static int exynos_srom_probe(struct platform_device *pdev) > +{ > + struct device_node *np; > + struct device *dev = &pdev->dev; > + > + np = dev->of_node; > + exynos_srom_base = of_iomap(np, 0); > + > + if (!exynos_srom_base) > + return PTR_ERR(exynos_srom_base); This looks wrong. If this is NULL, do not convert it to ERR. What will be the value of PTR_ERR(NULL)? > + > + exynos_srom_regs = exynos_srom_alloc_reg_dump(exynos_srom_offsets, > + sizeof(exynos_srom_offsets)); if (NULL) then what? Have you tested the error paths in the probe? > + > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int exynos_srom_suspend(struct device *dev) > +{ > + exynos_srom_save(exynos_srom_base, exynos_srom_regs, > + ARRAY_SIZE(exynos_srom_offsets)); > + > + return 0; > +} > + > +static int exynos_srom_resume(struct device *dev) > +{ > + exynos_srom_restore(exynos_srom_base, exynos_srom_regs, > + ARRAY_SIZE(exynos_srom_offsets)); > + > + return 0; > +} > + > +static const struct dev_pm_ops exynos_srom_dev_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(exynos_srom_suspend, exynos_srom_resume) > +}; > + > +#define DEV_PM_OPS (&exynos_srom_dev_pm_ops) > +#else > +#define DEV_PM_OPS NULL > +#endif /* CONFIG_PM_SLEEP */ That look like an old code. Please use SIMPLE_DEV_PM_OPS unless there is a reason not to. > + > +static struct platform_driver exynos_srom_driver = { > + .probe = exynos_srom_probe, > + .driver = { > + .name = "exynos-srom", > + .of_match_table = of_exynos_srom_ids, > + .pm = DEV_PM_OPS, > + }, > +}; > + > +static int __init exynos_srom_init(void) > +{ > + return platform_driver_register(&exynos_srom_driver); > +} > +device_initcall(exynos_srom_init); > diff --git a/drivers/soc/samsung/exynos-srom.h b/drivers/soc/samsung/exynos-srom.h > new file mode 100644 > index 0000000..e6ee438 > --- /dev/null > +++ b/drivers/soc/samsung/exynos-srom.h > @@ -0,0 +1,51 @@ > +/* > + * Copyright (c) 2015 Samsung Electronics Co., Ltd. > + * http://www.samsung.com > + * > + * Exynos SROMC register definitions > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > +*/ > + > +#ifndef __SAMSUNG_REGS_SROM_H > +#define __SAMSUNG_REGS_SROM_H __FILE__ The double-inclusion protection looks different than file path and name. Please make it similar. > +#define S5P_SROMREG(x) (x) > + > +#define S5P_SROM_BW S5P_SROMREG(0x0) > +#define S5P_SROM_BC0 S5P_SROMREG(0x4) > +#define S5P_SROM_BC1 S5P_SROMREG(0x8) > +#define S5P_SROM_BC2 S5P_SROMREG(0xc) > +#define S5P_SROM_BC3 S5P_SROMREG(0x10) > +#define S5P_SROM_BC4 S5P_SROMREG(0x14) > +#define S5P_SROM_BC5 S5P_SROMREG(0x18) > + > +/* one register BW holds 4 x 4-bit packed settings for NCS0 - NCS3 */ > + > +#define S5P_SROM_BW__DATAWIDTH__SHIFT 0 > +#define S5P_SROM_BW__ADDRMODE__SHIFT 1 > +#define S5P_SROM_BW__WAITENABLE__SHIFT 2 > +#define S5P_SROM_BW__BYTEENABLE__SHIFT 3 > + > +#define S5P_SROM_BW__CS_MASK 0xf > + > +#define S5P_SROM_BW__NCS0__SHIFT 0 > +#define S5P_SROM_BW__NCS1__SHIFT 4 > +#define S5P_SROM_BW__NCS2__SHIFT 8 > +#define S5P_SROM_BW__NCS3__SHIFT 12 > +#define S5P_SROM_BW__NCS4__SHIFT 16 > +#define S5P_SROM_BW__NCS5__SHIFT 20 > + > +/* applies to same to BCS0 - BCS3 */ > + > +#define S5P_SROM_BCX__PMC__SHIFT 0 > +#define S5P_SROM_BCX__TACP__SHIFT 4 > +#define S5P_SROM_BCX__TCAH__SHIFT 8 > +#define S5P_SROM_BCX__TCOH__SHIFT 12 > +#define S5P_SROM_BCX__TACC__SHIFT 16 > +#define S5P_SROM_BCX__TCOS__SHIFT 24 > +#define S5P_SROM_BCX__TACS__SHIFT 28 s/S5P/EXYNOS/ > + > +#endif /* __SAMSUNG_REGS_SROM_H */ > -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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