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Tue, 20 Oct 2015 18:21:31 +0900 (KST) From: Pankaj Dubey To: linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 6/8] drivers: soc: add support for exynos SROM driver Date: Tue, 20 Oct 2015 14:45:37 +0530 Message-id: <1445332540-12814-7-git-send-email-pankaj.dubey@samsung.com> X-Mailer: git-send-email 2.4.5 In-reply-to: <1445332540-12814-1-git-send-email-pankaj.dubey@samsung.com> References: <1445332540-12814-1-git-send-email-pankaj.dubey@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCLMWRmVeSWpSXmKPExsWyRsSkWnc2u1qYwY/bWhbbjzxjtXj9wtCi d8FVNotNj6+xWlzeNYfNYsb5fUwWry6tYrNYtPULu0XHMkYHTo/NS+o9+rasYvT4vEkugDmK yyYlNSezLLVI3y6BK+PWxOqC0y4Vm+bOZm1g/G/RxcjJISFgIjH5+y52CFtM4sK99WwgtpDA CkaJ5vtGMDX3t/9k7WLkAorPYpQ4dXoalNPKJLFjWgczSBWbgK7Ek/dzwWwRgWyJK433wWxm gcWMEl/uVHUxcnAIC3hItO3PADFZBFQlfpxWBKngBYpufHedESQsISAnsbS5FiTMKeApsW/K DkaIczwk9l3YzASyVUJgOrvEipdfwG5mERCQ+Db5EAtEr6zEpgPMECdLShxccYNlAqPwAkaG VYyiqQXJBcVJ6UWmesWJucWleel6yfm5mxiBgX3637OJOxjvH7A+xCjAwajEw6sRoxomxJpY VlyZe4jRFGjDRGYp0eR8YPzklcQbGpsZWZiamBobmVuaKYnz6kj/DBYSSE8sSc1OTS1ILYov Ks1JLT7EyMTBKdXA6Mgvx+bFFWvrxqpknvGUhXtlX5iZTb8QX8SjlzkXSwPDK2+/u8bwJ9zk 0t8KJ4+Nl/4dvuR45Edj/Y5EnZVCa099s18V0hB2KM3u5galyP3sJfZ9uat5+v3XPYiuP269 yvRA/GrL9BOWuzOvffARkj84dSHDpSnxWUVPul/cmREcaSd/3GKOEktxRqKhFnNRcSIAa68T iWcCAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsVy+t9jQd3Z7GphBk3NyhbbjzxjtXj9wtCi d8FVNotNj6+xWlzeNYfNYsb5fUwWry6tYrNYtPULu0XHMkYHTo/NS+o9+rasYvT4vEkugDmq gdEmIzUxJbVIITUvOT8lMy/dVsk7ON453tTMwFDX0NLCXEkhLzE31VbJxSdA1y0zB+gIJYWy xJxSoFBAYnGxkr4dpgmhIW66FjCNEbq+IUFwPUYGaCBhDWPGrYnVBaddKjbNnc3awPjfoouR k0NCwETi/vafrBC2mMSFe+vZuhi5OIQEZjFKnDo9jRXCaWWS2DGtgxmkik1AV+LJ+7lgtohA tsSVxvtgNrPAYkaJL3equhg5OIQFPCTa9meAmCwCqhI/TiuCVPACRTe+u84IEpYQkJNY2lwL EuYU8JTYN2UHI4gtBFSy78JmpgmMvAsYGVYxSqQWJBcUJ6XnGuallusVJ+YWl+al6yXn525i BMfPM6kdjAd3uR9iFOBgVOLh1YhRDRNiTSwrrsw9xCjBwawkwqvHphYmxJuSWFmVWpQfX1Sa k1p8iNEU6KyJzFKiyfnA2M4riTc0NjE3NTa1NLEwMbNUEue9cYghTEggPbEkNTs1tSC1CKaP iYNTqoGxV2iLR96B5DunVZtb7GZ55Z+U88/y+z+lr2dPlpu3qO2tCV3b75vxpm1dyPN2v4C7 6OOdcfzHfy17p/eS+4POkUzOTuMHCz0nZS053PTwxIznktF+HJsaTTLPTN7BPE9+xYbpIRF9 IqHfrhS8YG+zzlieoZPpuqkremsj/x5V0d+z6o9HrQ1TYinOSDTUYi4qTgQADXlzkrUCAAA= DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151020_022153_606672_677379A3 X-CRM114-Status: GOOD ( 23.20 ) X-Spam-Score: -6.9 (------) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: k.kozlowski@samsung.com, kgene.kim@samsung.com, Pankaj Dubey , p.fedin@samsung.com, andi.shyti@samsung.com, thomas.ab@samsung.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds Exynos SROM controller driver which will handle save restore of SROM registers during S2R. Signed-off-by: Pankaj Dubey Reviewed-by: Krzysztof Kozlowski --- drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/samsung/Kconfig | 13 +++ drivers/soc/samsung/Makefile | 1 + drivers/soc/samsung/exynos-srom.c | 175 ++++++++++++++++++++++++++++++++++++++ drivers/soc/samsung/exynos-srom.h | 51 +++++++++++ 6 files changed, 242 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 96ddecb..69107c9 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -2,6 +2,7 @@ menu "SOC (System On Chip) specific Drivers" source "drivers/soc/mediatek/Kconfig" source "drivers/soc/qcom/Kconfig" +source "drivers/soc/samsung/Kconfig" source "drivers/soc/sunxi/Kconfig" source "drivers/soc/ti/Kconfig" source "drivers/soc/versatile/Kconfig" diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 0b12d77..a623616 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_MACH_DOVE) += dove/ obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/ obj-$(CONFIG_ARCH_QCOM) += qcom/ +obj-$(CONFIG_SOC_SAMSUNG) += samsung/ obj-$(CONFIG_ARCH_SUNXI) += sunxi/ obj-$(CONFIG_ARCH_TEGRA) += tegra/ obj-$(CONFIG_SOC_TI) += ti/ diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig new file mode 100644 index 0000000..2833b5b --- /dev/null +++ b/drivers/soc/samsung/Kconfig @@ -0,0 +1,13 @@ +# +# SAMSUNG SoC drivers +# +menu "Samsung SOC driver support" + +config SOC_SAMSUNG + bool + +config EXYNOS_SROM + bool + depends on ARM && ARCH_EXYNOS && PM + +endmenu diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile new file mode 100644 index 0000000..9c554d5 --- /dev/null +++ b/drivers/soc/samsung/Makefile @@ -0,0 +1 @@ +obj-$(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..57a232d --- /dev/null +++ b/drivers/soc/samsung/exynos-srom.c @@ -0,0 +1,175 @@ +/* + * Copyright (c) 2015 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * + * EXYNOS - SROM Controller support + * Author: Pankaj Dubey + * + * 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 +#include +#include +#include +#include +#include + +#include "exynos-srom.h" + +static const unsigned long exynos_srom_offsets[] = { + /* SROM side */ + EXYNOS_SROM_BW, + EXYNOS_SROM_BC0, + EXYNOS_SROM_BC1, + EXYNOS_SROM_BC2, + EXYNOS_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 of register under the offset. + */ +struct exynos_srom_reg_dump { + u32 offset; + u32 value; +}; + +/** + * struct exynos_srom: platform data for exynos srom controller driver. + * @dev: platform device pointer + * @reg_base: srom base address + * @reg_offset: exynos_srom_reg_dump pointer to hold offset and its value. + */ +struct exynos_srom { + struct device *dev; + void __iomem *reg_base; + struct exynos_srom_reg_dump *reg_offset; +}; + +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 int exynos_srom_probe(struct platform_device *pdev) +{ + struct device_node *np; + struct exynos_srom *srom; + struct device *dev = &pdev->dev; + + np = dev->of_node; + if (!np) { + dev_err(&pdev->dev, "could not find device info\n"); + return -EINVAL; + } + + srom = devm_kzalloc(&pdev->dev, + sizeof(struct exynos_srom), GFP_KERNEL); + if (!srom) + return -ENOMEM; + + srom->dev = dev; + srom->reg_base = of_iomap(np, 0); + if (!srom->reg_base) { + dev_err(&pdev->dev, "iomap of exynos srom controller failed\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, srom); + + srom->reg_offset = exynos_srom_alloc_reg_dump(exynos_srom_offsets, + sizeof(exynos_srom_offsets)); + if (!srom->reg_offset) { + iounmap(srom->reg_base); + return -ENOMEM; + } + + return 0; +} + +static int exynos_srom_remove(struct platform_device *pdev) +{ + struct exynos_srom *srom = platform_get_drvdata(pdev); + + kfree(srom->reg_offset); + iounmap(srom->reg_base); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +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 int exynos_srom_suspend(struct device *dev) +{ + struct exynos_srom *srom = dev_get_drvdata(dev); + + exynos_srom_save(srom->reg_base, srom->reg_offset, + ARRAY_SIZE(exynos_srom_offsets)); + return 0; +} + +static int exynos_srom_resume(struct device *dev) +{ + struct exynos_srom *srom = dev_get_drvdata(dev); + + exynos_srom_restore(srom->reg_base, srom->reg_offset, + ARRAY_SIZE(exynos_srom_offsets)); + return 0; +} +#endif + +static const struct of_device_id of_exynos_srom_ids[] = { + { + .compatible = "samsung,exynos-srom", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_exynos_srom_ids); + +static SIMPLE_DEV_PM_OPS(exynos_srom_pm_ops, exynos_srom_suspend, exynos_srom_resume); + +static struct platform_driver exynos_srom_driver = { + .probe = exynos_srom_probe, + .remove = exynos_srom_remove, + .driver = { + .name = "exynos-srom", + .of_match_table = of_exynos_srom_ids, + .pm = &exynos_srom_pm_ops, + }, +}; +module_platform_driver(exynos_srom_driver); + +MODULE_AUTHOR("Pankaj Dubey "); +MODULE_DESCRIPTION("Exynos SROM Controller Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/soc/samsung/exynos-srom.h b/drivers/soc/samsung/exynos-srom.h new file mode 100644 index 0000000..34660c6 --- /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 __EXYNOS_SROM_H +#define __EXYNOS_SROM_H __FILE__ + +#define EXYNOS_SROMREG(x) (x) + +#define EXYNOS_SROM_BW EXYNOS_SROMREG(0x0) +#define EXYNOS_SROM_BC0 EXYNOS_SROMREG(0x4) +#define EXYNOS_SROM_BC1 EXYNOS_SROMREG(0x8) +#define EXYNOS_SROM_BC2 EXYNOS_SROMREG(0xc) +#define EXYNOS_SROM_BC3 EXYNOS_SROMREG(0x10) +#define EXYNOS_SROM_BC4 EXYNOS_SROMREG(0x14) +#define EXYNOS_SROM_BC5 EXYNOS_SROMREG(0x18) + +/* one register BW holds 4 x 4-bit packed settings for NCS0 - NCS3 */ + +#define EXYNOS_SROM_BW__DATAWIDTH__SHIFT 0 +#define EXYNOS_SROM_BW__ADDRMODE__SHIFT 1 +#define EXYNOS_SROM_BW__WAITENABLE__SHIFT 2 +#define EXYNOS_SROM_BW__BYTEENABLE__SHIFT 3 + +#define EXYNOS_SROM_BW__CS_MASK 0xf + +#define EXYNOS_SROM_BW__NCS0__SHIFT 0 +#define EXYNOS_SROM_BW__NCS1__SHIFT 4 +#define EXYNOS_SROM_BW__NCS2__SHIFT 8 +#define EXYNOS_SROM_BW__NCS3__SHIFT 12 +#define EXYNOS_SROM_BW__NCS4__SHIFT 16 +#define EXYNOS_SROM_BW__NCS5__SHIFT 20 + +/* applies to same to BCS0 - BCS3 */ + +#define EXYNOS_SROM_BCX__PMC__SHIFT 0 +#define EXYNOS_SROM_BCX__TACP__SHIFT 4 +#define EXYNOS_SROM_BCX__TCAH__SHIFT 8 +#define EXYNOS_SROM_BCX__TCOH__SHIFT 12 +#define EXYNOS_SROM_BCX__TACC__SHIFT 16 +#define EXYNOS_SROM_BCX__TCOS__SHIFT 24 +#define EXYNOS_SROM_BCX__TACS__SHIFT 28 + +#endif /* __EXYNOS_SROM_H */