From: Pankaj Dubey <pankaj.dubey@samsung.com>
To: linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: kgene.kim@samsung.com, k.kozlowski@samsung.com,
thomas.ab@samsung.com, p.fedin@samsung.com,
andi.shyti@samsung.com, Pankaj Dubey <pankaj.dubey@samsung.com>,
Kukjin Kim <kgene@kernel.org>
Subject: [RESEND PATCH v5 6/8] drivers: soc: add support for exynos SROM driver
Date: Sat, 12 Dec 2015 13:14:00 +0530 [thread overview]
Message-ID: <1449906242-20843-7-git-send-email-pankaj.dubey@samsung.com> (raw)
In-Reply-To: <1449906242-20843-1-git-send-email-pankaj.dubey@samsung.com>
This patch adds Exynos SROM controller driver which will handle
save restore of SROM registers during S2R.
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
[p.fedin@samsung.com: tested on SMDK5410]
Tested-by: Pavel Fedin <p.fedin@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
---
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 4e853ed..332c19f 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -4,6 +4,7 @@ source "drivers/soc/brcmstb/Kconfig"
source "drivers/soc/mediatek/Kconfig"
source "drivers/soc/qcom/Kconfig"
source "drivers/soc/rockchip/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 f2ba2e9..3b8bb23 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_MACH_DOVE) += dove/
obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
obj-$(CONFIG_ARCH_QCOM) += qcom/
obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
+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 <pankaj.dubey@samsung.com>
+ *
+ * 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/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#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 <pankaj.dubey@samsung.com>");
+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 */
--
1.9.1
next prev parent reply other threads:[~2015-12-12 7:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-12 7:43 [RESEND PATCH v5 0/8] Add support for Exynos SROM Controller driver Pankaj Dubey
2015-12-12 7:43 ` [RESEND PATCH v5 1/8] ARM: EXYNOS: remove unused static mapping of CMU for exynos5 Pankaj Dubey
2015-12-12 7:43 ` [RESEND PATCH v5 2/8] ARM: EXYNOS: code cleanup in map.h Pankaj Dubey
2015-12-12 7:43 ` [RESEND PATCH v5 3/8] dt-bindings: add exynos-srom device tree binding Pankaj Dubey
2015-12-12 7:43 ` [RESEND PATCH v5 4/8] ARM: dts: add SROM device node for exynos4 Pankaj Dubey
2015-12-12 7:43 ` [RESEND PATCH v5 5/8] ARM: dts: add SROM device node for exynos5 Pankaj Dubey
2015-12-12 7:44 ` Pankaj Dubey [this message]
2015-12-12 7:44 ` [RESEND PATCH v5 7/8] MAINTAINERS: add maintainers entry for drivers/soc/samsung Pankaj Dubey
2015-12-12 7:44 ` [RESEND PATCH v5 8/8] ARM: EXYNOS: Remove SROM related register settings from mach-exynos Pankaj Dubey
2015-12-14 7:39 ` [RESEND PATCH v5 0/8] Add support for Exynos SROM Controller driver Pavel Fedin
2015-12-17 5:14 ` Krzysztof Kozlowski
2015-12-18 3:39 ` pankaj.dubey
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1449906242-20843-7-git-send-email-pankaj.dubey@samsung.com \
--to=pankaj.dubey@samsung.com \
--cc=andi.shyti@samsung.com \
--cc=k.kozlowski@samsung.com \
--cc=kgene.kim@samsung.com \
--cc=kgene@kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-samsung-soc@vger.kernel.org \
--cc=p.fedin@samsung.com \
--cc=thomas.ab@samsung.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).