reset: Add i.MX7 SRC reset driver
Add reset controller driver exposing various reset faculties,
implemented by System Reset Controller IP block.
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index f4cdfe9..c9e7459 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -27,6 +27,13 @@
help
This enables the reset controller driver for Marvell Berlin SoCs.
+config RESET_IMX7
+ bool "i.MX7 Reset Driver" if COMPILE_TEST
+ default SOC_IMX7D
+ select MFD_SYSCON
+ help
+ This enables the reset controller driver for i.MX7 SoCs.
+
config RESET_LPC18XX
bool "LPC18xx/43xx Reset Driver" if COMPILE_TEST
default ARCH_LPC18XX
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 2cd3f6c..c7ac1d6 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -4,6 +4,7 @@
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
+obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o
obj-$(CONFIG_RESET_MESON) += reset-meson.o
obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
@@ -15,3 +16,4 @@
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_RESET_ZX2967) += reset-zx2967.o
obj-$(CONFIG_RESET_ZYNQ) += reset-zynq.o
+
diff --git a/drivers/reset/reset-imx7.c b/drivers/reset/reset-imx7.c
new file mode 100644
index 0000000..4db177b
--- /dev/null
+++ b/drivers/reset/reset-imx7.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2017, Impinj, Inc.
+ *
+ * i.MX7 System Reset Controller (SRC) driver
+ *
+ * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/regmap.h>
+#include <dt-bindings/reset/imx7-reset.h>
+
+struct imx7_src {
+ struct reset_controller_dev rcdev;
+ struct regmap *regmap;
+};
+
+enum imx7_src_registers {
+ SRC_A7RCR0 = 0x0004,
+ SRC_M4RCR = 0x000c,
+ SRC_ERCR = 0x0014,
+ SRC_HSICPHY_RCR = 0x001c,
+ SRC_USBOPHY1_RCR = 0x0020,
+ SRC_USBOPHY2_RCR = 0x0024,
+ SRC_MIPIPHY_RCR = 0x0028,
+ SRC_PCIEPHY_RCR = 0x002c,
+ SRC_DDRC_RCR = 0x1000,
+};
+
+struct imx7_src_signal {
+ unsigned int offset, bit;
+};
+
+static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
+ [IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
+ [IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
+ [IMX7_RESET_A7_CORE_RESET0] = { SRC_A7RCR0, BIT(4) },
+ [IMX7_RESET_A7_CORE_RESET1] = { SRC_A7RCR0, BIT(5) },
+ [IMX7_RESET_A7_DBG_RESET0] = { SRC_A7RCR0, BIT(8) },
+ [IMX7_RESET_A7_DBG_RESET1] = { SRC_A7RCR0, BIT(9) },
+ [IMX7_RESET_A7_ETM_RESET0] = { SRC_A7RCR0, BIT(12) },
+ [IMX7_RESET_A7_ETM_RESET1] = { SRC_A7RCR0, BIT(13) },
+ [IMX7_RESET_A7_SOC_DBG_RESET] = { SRC_A7RCR0, BIT(20) },
+ [IMX7_RESET_A7_L2RESET] = { SRC_A7RCR0, BIT(21) },
+ [IMX7_RESET_SW_M4C_RST] = { SRC_M4RCR, BIT(1) },
+ [IMX7_RESET_SW_M4P_RST] = { SRC_M4RCR, BIT(2) },
+ [IMX7_RESET_EIM_RST] = { SRC_ERCR, BIT(0) },
+ [IMX7_RESET_HSICPHY_PORT_RST] = { SRC_HSICPHY_RCR, BIT(1) },
+ [IMX7_RESET_USBPHY1_POR] = { SRC_USBOPHY1_RCR, BIT(0) },
+ [IMX7_RESET_USBPHY1_PORT_RST] = { SRC_USBOPHY1_RCR, BIT(1) },
+ [IMX7_RESET_USBPHY2_POR] = { SRC_USBOPHY2_RCR, BIT(0) },
+ [IMX7_RESET_USBPHY2_PORT_RST] = { SRC_USBOPHY2_RCR, BIT(1) },
+ [IMX7_RESET_MIPI_PHY_MRST] = { SRC_MIPIPHY_RCR, BIT(1) },
+ [IMX7_RESET_MIPI_PHY_SRST] = { SRC_MIPIPHY_RCR, BIT(2) },
+ [IMX7_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR, BIT(2) | BIT(1) },
+ [IMX7_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
+ [IMX7_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
+ [IMX7_RESET_DDRC_PRST] = { SRC_DDRC_RCR, BIT(0) },
+ [IMX7_RESET_DDRC_CORE_RST] = { SRC_DDRC_RCR, BIT(1) },
+};
+
+static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct imx7_src, rcdev);
+}
+
+static int imx7_reset_set(struct reset_controller_dev *rcdev,
+ unsigned long id, bool assert)
+{
+ struct imx7_src *imx7src = to_imx7_src(rcdev);
+ const struct imx7_src_signal *signal = &imx7_src_signals[id];
+ unsigned int value = 0;
+
+ switch (id) {
+ case IMX7_RESET_PCIEPHY:
+ /*
+ * wait for more than 10us to release phy g_rst and
+ * btnrst
+ */
+ if (!assert)
+ udelay(10);
+ break;
+
+ case IMX7_RESET_PCIE_CTRL_APPS_EN:
+ value = (assert) ? 0 : signal->bit;
+ break;
+ }
+
+ return regmap_update_bits(imx7src->regmap,
+ signal->offset, signal->bit, value);
+}
+
+static int imx7_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ return imx7_reset_set(rcdev, id, true);
+}
+
+static int imx7_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ return imx7_reset_set(rcdev, id, false);
+}
+
+static const struct reset_control_ops imx7_reset_ops = {
+ .assert = imx7_reset_assert,
+ .deassert = imx7_reset_deassert,
+};
+
+static int imx7_reset_probe(struct platform_device *pdev)
+{
+ struct imx7_src *imx7src;
+ struct device *dev = &pdev->dev;
+ struct regmap_config config = { .name = "src" };
+
+ imx7src = devm_kzalloc(dev, sizeof(*imx7src), GFP_KERNEL);
+ if (!imx7src)
+ return -ENOMEM;
+
+ imx7src->regmap = syscon_node_to_regmap(dev->of_node);
+ if (IS_ERR(imx7src->regmap)) {
+ dev_err(dev, "Unable to get imx7-src regmap");
+ return PTR_ERR(imx7src->regmap);
+ }
+ regmap_attach_dev(dev, imx7src->regmap, &config);
+
+ imx7src->rcdev.owner = THIS_MODULE;
+ imx7src->rcdev.nr_resets = IMX7_RESET_NUM;
+ imx7src->rcdev.ops = &imx7_reset_ops;
+ imx7src->rcdev.of_node = dev->of_node;
+
+ return devm_reset_controller_register(dev, &imx7src->rcdev);
+}
+
+static const struct of_device_id imx7_reset_dt_ids[] = {
+ { .compatible = "fsl,imx7d-src", },
+ { /* sentinel */ },
+};
+
+static struct platform_driver imx7_reset_driver = {
+ .probe = imx7_reset_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = imx7_reset_dt_ids,
+ },
+};
+builtin_platform_driver(imx7_reset_driver);
