8 files changed, 367 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/reset/st,stm32mp1-rcc.txt b/Documentation/devicetree/bindings/reset/st,stm32mp1-rcc.txt
new file mode 100644
index 000000000000..b4edaf7c7ff3
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/st,stm32mp1-rcc.txt
@@ -0,0 +1,6 @@
+STMicroelectronics STM32MP1 Peripheral Reset Controller
+=======================================================
+
+The RCC IP is both a reset and a clock controller.
+
+Please see Documentation/devicetree/bindings/clock/st,stm32mp1-rcc.txt
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 18f152d251d7..c0b292be1b72 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -49,6 +49,7 @@ config RESET_HSDK
 
 config RESET_IMX7
         bool "i.MX7 Reset Driver" if COMPILE_TEST
+        depends on HAS_IOMEM
         default SOC_IMX7D
         select MFD_SYSCON
         help
@@ -96,6 +97,12 @@ config RESET_SIMPLE
            - Allwinner SoCs
            - ZTE's zx2967 family
 
+config RESET_STM32MP157
+        bool "STM32MP157 Reset Driver" if COMPILE_TEST
+        default MACH_STM32MP157
+        help
+          This enables the RCC reset controller driver for STM32 MPUs.
+
 config RESET_SUNXI
         bool "Allwinner SoCs Reset Driver" if COMPILE_TEST && !ARCH_SUNXI
         default ARCH_SUNXI
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 132c24f5ddb5..c1261dcfe9ad 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_RESET_MESON) += reset-meson.o
 obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
 obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
 obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o
+obj-$(CONFIG_RESET_STM32MP157) += reset-stm32mp1.o
 obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
 obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
 obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o
diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index da4292e9de97..6488292e129c 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -23,6 +23,9 @@
 static DEFINE_MUTEX(reset_list_mutex);
 static LIST_HEAD(reset_controller_list);
 
+static DEFINE_MUTEX(reset_lookup_mutex);
+static LIST_HEAD(reset_lookup_list);
+
 /**
  * struct reset_control - a reset control
  * @rcdev: a pointer to the reset controller device
@@ -148,6 +151,33 @@ int devm_reset_controller_register(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(devm_reset_controller_register);
 
+/**
+ * reset_controller_add_lookup - register a set of lookup entries
+ * @lookup: array of reset lookup entries
+ * @num_entries: number of entries in the lookup array
+ */
+void reset_controller_add_lookup(struct reset_control_lookup *lookup,
+                                 unsigned int num_entries)
+{
+        struct reset_control_lookup *entry;
+        unsigned int i;
+
+        mutex_lock(&reset_lookup_mutex);
+        for (i = 0; i < num_entries; i++) {
+                entry = &lookup[i];
+
+                if (!entry->dev_id || !entry->provider) {
+                        pr_warn("%s(): reset lookup entry badly specified, skipping\n",
+                                __func__);
+                        continue;
+                }
+
+                list_add_tail(&entry->list, &reset_lookup_list);
+        }
+        mutex_unlock(&reset_lookup_mutex);
+}
+EXPORT_SYMBOL_GPL(reset_controller_add_lookup);
+
 static inline struct reset_control_array *
 rstc_to_array(struct reset_control *rstc) {
         return container_of(rstc, struct reset_control_array, base);
@@ -493,6 +523,70 @@ struct reset_control *__of_reset_control_get(struct device_node *node,
 }
 EXPORT_SYMBOL_GPL(__of_reset_control_get);
 
+static struct reset_controller_dev *
+__reset_controller_by_name(const char *name)
+{
+        struct reset_controller_dev *rcdev;
+
+        lockdep_assert_held(&reset_list_mutex);
+
+        list_for_each_entry(rcdev, &reset_controller_list, list) {
+                if (!rcdev->dev)
+                        continue;
+
+                if (!strcmp(name, dev_name(rcdev->dev)))
+                        return rcdev;
+        }
+
+        return NULL;
+}
+
+static struct reset_control *
+__reset_control_get_from_lookup(struct device *dev, const char *con_id,
+                                bool shared, bool optional)
+{
+        const struct reset_control_lookup *lookup;
+        struct reset_controller_dev *rcdev;
+        const char *dev_id = dev_name(dev);
+        struct reset_control *rstc = NULL;
+
+        if (!dev)
+                return ERR_PTR(-EINVAL);
+
+        mutex_lock(&reset_lookup_mutex);
+
+        list_for_each_entry(lookup, &reset_lookup_list, list) {
+                if (strcmp(lookup->dev_id, dev_id))
+                        continue;
+
+                if ((!con_id && !lookup->con_id) ||
+                    ((con_id && lookup->con_id) &&
+                     !strcmp(con_id, lookup->con_id))) {
+                        mutex_lock(&reset_list_mutex);
+                        rcdev = __reset_controller_by_name(lookup->provider);
+                        if (!rcdev) {
+                                mutex_unlock(&reset_list_mutex);
+                                mutex_unlock(&reset_lookup_mutex);
+                                /* Reset provider may not be ready yet. */
+                                return ERR_PTR(-EPROBE_DEFER);
+                        }
+
+                        rstc = __reset_control_get_internal(rcdev,
+                                                            lookup->index,
+                                                            shared);
+                        mutex_unlock(&reset_list_mutex);
+                        break;
+                }
+        }
+
+        mutex_unlock(&reset_lookup_mutex);
+
+        if (!rstc)
+                return optional ? NULL : ERR_PTR(-ENOENT);
+
+        return rstc;
+}
+
 struct reset_control *__reset_control_get(struct device *dev, const char *id,
                                           int index, bool shared, bool optional)
 {
@@ -500,7 +594,7 @@ struct reset_control *__reset_control_get(struct device *dev, const char *id,
                 return __of_reset_control_get(dev->of_node, id, index, shared,
                                               optional);
 
-        return optional ? NULL : ERR_PTR(-EINVAL);
+        return __reset_control_get_from_lookup(dev, id, shared, optional);
 }
 EXPORT_SYMBOL_GPL(__reset_control_get);
 
diff --git a/drivers/reset/reset-stm32mp1.c b/drivers/reset/reset-stm32mp1.c
new file mode 100644
index 000000000000..b221a28041fa
--- /dev/null
+++ b/drivers/reset/reset-stm32mp1.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
+ * Author: Gabriel Fernandez <gabriel.fernandez@st.com> for STMicroelectronics.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+#define CLR_OFFSET 0x4
+
+struct stm32_reset_data {
+        struct reset_controller_dev     rcdev;
+        void __iomem                    *membase;
+};
+
+static inline struct stm32_reset_data *
+to_stm32_reset_data(struct reset_controller_dev *rcdev)
+{
+        return container_of(rcdev, struct stm32_reset_data, rcdev);
+}
+
+static int stm32_reset_update(struct reset_controller_dev *rcdev,
+                              unsigned long id, bool assert)
+{
+        struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
+        int reg_width = sizeof(u32);
+        int bank = id / (reg_width * BITS_PER_BYTE);
+        int offset = id % (reg_width * BITS_PER_BYTE);
+        void __iomem *addr;
+
+        addr = data->membase + (bank * reg_width);
+        if (!assert)
+                addr += CLR_OFFSET;
+
+        writel(BIT(offset), addr);
+
+        return 0;
+}
+
+static int stm32_reset_assert(struct reset_controller_dev *rcdev,
+                              unsigned long id)
+{
+        return stm32_reset_update(rcdev, id, true);
+}
+
+static int stm32_reset_deassert(struct reset_controller_dev *rcdev,
+                                unsigned long id)
+{
+        return stm32_reset_update(rcdev, id, false);
+}
+
+static int stm32_reset_status(struct reset_controller_dev *rcdev,
+                              unsigned long id)
+{
+        struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
+        int reg_width = sizeof(u32);
+        int bank = id / (reg_width * BITS_PER_BYTE);
+        int offset = id % (reg_width * BITS_PER_BYTE);
+        u32 reg;
+
+        reg = readl(data->membase + (bank * reg_width));
+
+        return !!(reg & BIT(offset));
+}
+
+static const struct reset_control_ops stm32_reset_ops = {
+        .assert         = stm32_reset_assert,
+        .deassert       = stm32_reset_deassert,
+        .status         = stm32_reset_status,
+};
+
+static const struct of_device_id stm32_reset_dt_ids[] = {
+        { .compatible = "st,stm32mp1-rcc"},
+        { /* sentinel */ },
+};
+
+static int stm32_reset_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct stm32_reset_data *data;
+        void __iomem *membase;
+        struct resource *res;
+
+        data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+        if (!data)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        membase = devm_ioremap_resource(dev, res);
+        if (IS_ERR(membase))
+                return PTR_ERR(membase);
+
+        data->membase = membase;
+        data->rcdev.owner = THIS_MODULE;
+        data->rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
+        data->rcdev.ops = &stm32_reset_ops;
+        data->rcdev.of_node = dev->of_node;
+
+        return devm_reset_controller_register(dev, &data->rcdev);
+}
+
+static struct platform_driver stm32_reset_driver = {
+        .probe  = stm32_reset_probe,
+        .driver = {
+                .name           = "stm32mp1-reset",
+                .of_match_table = stm32_reset_dt_ids,
+        },
+};
+
+builtin_platform_driver(stm32_reset_driver);
diff --git a/drivers/reset/reset-uniphier.c b/drivers/reset/reset-uniphier.c
index e8bb023ff15e..360e06b20c53 100644
--- a/drivers/reset/reset-uniphier.c
+++ b/drivers/reset/reset-uniphier.c
@@ -63,6 +63,7 @@ static const struct uniphier_reset_data uniphier_pro4_sys_reset_data[] = {
         UNIPHIER_RESETX(12, 0x2000, 6),         /* GIO (Ether, SATA, USB3) */
         UNIPHIER_RESETX(14, 0x2000, 17),        /* USB30 */
         UNIPHIER_RESETX(15, 0x2004, 17),        /* USB31 */
+        UNIPHIER_RESETX(40, 0x2000, 13),        /* AIO */
         UNIPHIER_RESET_END,
 };
 
@@ -72,6 +73,7 @@ static const struct uniphier_reset_data uniphier_pro5_sys_reset_data[] = {
         UNIPHIER_RESETX(12, 0x2000, 6),         /* GIO (PCIe, USB3) */
         UNIPHIER_RESETX(14, 0x2000, 17),        /* USB30 */
         UNIPHIER_RESETX(15, 0x2004, 17),        /* USB31 */
+        UNIPHIER_RESETX(40, 0x2000, 13),        /* AIO */
         UNIPHIER_RESET_END,
 };
 
@@ -88,6 +90,7 @@ static const struct uniphier_reset_data uniphier_pxs2_sys_reset_data[] = {
         UNIPHIER_RESETX(21, 0x2014, 1),         /* USB31-PHY1 */
         UNIPHIER_RESETX(28, 0x2014, 12),        /* SATA */
         UNIPHIER_RESET(29, 0x2014, 8),          /* SATA-PHY (active high) */
+        UNIPHIER_RESETX(40, 0x2000, 13),        /* AIO */
         UNIPHIER_RESET_END,
 };
 
@@ -121,6 +124,8 @@ static const struct uniphier_reset_data uniphier_ld20_sys_reset_data[] = {
 static const struct uniphier_reset_data uniphier_pxs3_sys_reset_data[] = {
         UNIPHIER_RESETX(2, 0x200c, 0),          /* NAND */
         UNIPHIER_RESETX(4, 0x200c, 2),          /* eMMC */
+        UNIPHIER_RESETX(6, 0x200c, 9),          /* Ether0 */
+        UNIPHIER_RESETX(7, 0x200c, 10),         /* Ether1 */
         UNIPHIER_RESETX(8, 0x200c, 12),         /* STDMAC */
         UNIPHIER_RESETX(12, 0x200c, 4),         /* USB30 link (GIO0) */
         UNIPHIER_RESETX(13, 0x200c, 5),         /* USB31 link (GIO1) */
diff --git a/include/dt-bindings/reset/stm32mp1-resets.h b/include/dt-bindings/reset/stm32mp1-resets.h
new file mode 100644
index 000000000000..f0c3aaef67a0
--- /dev/null
+++ b/include/dt-bindings/reset/stm32mp1-resets.h
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
+/*
+ * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
+ * Author: Gabriel Fernandez <gabriel.fernandez@st.com> for STMicroelectronics.
+ */
+
+#ifndef _DT_BINDINGS_STM32MP1_RESET_H_
+#define _DT_BINDINGS_STM32MP1_RESET_H_
+
+#define LTDC_R          3072
+#define DSI_R           3076
+#define DDRPERFM_R      3080
+#define USBPHY_R        3088
+#define SPI6_R          3136
+#define I2C4_R          3138
+#define I2C6_R          3139
+#define USART1_R        3140
+#define STGEN_R         3156
+#define GPIOZ_R         3200
+#define CRYP1_R         3204
+#define HASH1_R         3205
+#define RNG1_R          3206
+#define AXIM_R          3216
+#define GPU_R           3269
+#define ETHMAC_R        3274
+#define FMC_R           3276
+#define QSPI_R          3278
+#define SDMMC1_R        3280
+#define SDMMC2_R        3281
+#define CRC1_R          3284
+#define USBH_R          3288
+#define MDMA_R          3328
+#define MCU_R           8225
+#define TIM2_R          19456
+#define TIM3_R          19457
+#define TIM4_R          19458
+#define TIM5_R          19459
+#define TIM6_R          19460
+#define TIM7_R          19461
+#define TIM12_R         16462
+#define TIM13_R         16463
+#define TIM14_R         16464
+#define LPTIM1_R        19465
+#define SPI2_R          19467
+#define SPI3_R          19468
+#define USART2_R        19470
+#define USART3_R        19471
+#define UART4_R         19472
+#define UART5_R         19473
+#define UART7_R         19474
+#define UART8_R         19475
+#define I2C1_R          19477
+#define I2C2_R          19478
+#define I2C3_R          19479
+#define I2C5_R          19480
+#define SPDIF_R         19482
+#define CEC_R           19483
+#define DAC12_R         19485
+#define MDIO_R          19847
+#define TIM1_R          19520
+#define TIM8_R          19521
+#define TIM15_R         19522
+#define TIM16_R         19523
+#define TIM17_R         19524
+#define SPI1_R          19528
+#define SPI4_R          19529
+#define SPI5_R          19530
+#define USART6_R        19533
+#define SAI1_R          19536
+#define SAI2_R          19537
+#define SAI3_R          19538
+#define DFSDM_R         19540
+#define FDCAN_R         19544
+#define LPTIM2_R        19584
+#define LPTIM3_R        19585
+#define LPTIM4_R        19586
+#define LPTIM5_R        19587
+#define SAI4_R          19592
+#define SYSCFG_R        19595
+#define VREF_R          19597
+#define TMPSENS_R       19600
+#define PMBCTRL_R       19601
+#define DMA1_R          19648
+#define DMA2_R          19649
+#define DMAMUX_R        19650
+#define ADC12_R         19653
+#define USBO_R          19656
+#define SDMMC3_R        19664
+#define CAMITF_R        19712
+#define CRYP2_R         19716
+#define HASH2_R         19717
+#define RNG2_R          19718
+#define CRC2_R          19719
+#define HSEM_R          19723
+#define MBOX_R          19724
+#define GPIOA_R         19776
+#define GPIOB_R         19777
+#define GPIOC_R         19778
+#define GPIOD_R         19779
+#define GPIOE_R         19780
+#define GPIOF_R         19781
+#define GPIOG_R         19782
+#define GPIOH_R         19783
+#define GPIOI_R         19784
+#define GPIOJ_R         19785
+#define GPIOK_R         19786
+
+#endif /* _DT_BINDINGS_STM32MP1_RESET_H_ */
diff --git a/include/linux/reset-controller.h b/include/linux/reset-controller.h
index adb88f8cefbc..9326d671b6e6 100644
--- a/include/linux/reset-controller.h
+++ b/include/linux/reset-controller.h
@@ -27,12 +27,38 @@ struct device_node;
 struct of_phandle_args;
 
 /**
+ * struct reset_control_lookup - represents a single lookup entry
+ *
+ * @list: internal list of all reset lookup entries
+ * @provider: name of the reset controller device controlling this reset line
+ * @index: ID of the reset controller in the reset controller device
+ * @dev_id: name of the device associated with this reset line
+ * @con_id name of the reset line (can be NULL)
+ */
+struct reset_control_lookup {
+        struct list_head list;
+        const char *provider;
+        unsigned int index;
+        const char *dev_id;
+        const char *con_id;
+};
+
+#define RESET_LOOKUP(_provider, _index, _dev_id, _con_id)               \
+        {                                                               \
+                .provider = _provider,                                  \
+                .index = _index,                                        \
+                .dev_id = _dev_id,                                      \
+                .con_id = _con_id,                                      \
+        }
+
+/**
  * struct reset_controller_dev - reset controller entity that might
  *                               provide multiple reset controls
  * @ops: a pointer to device specific struct reset_control_ops
  * @owner: kernel module of the reset controller driver
  * @list: internal list of reset controller devices
  * @reset_control_head: head of internal list of requested reset controls
+ * @dev: corresponding driver model device struct
  * @of_node: corresponding device tree node as phandle target
  * @of_reset_n_cells: number of cells in reset line specifiers
  * @of_xlate: translation function to translate from specifier as found in the
@@ -44,6 +70,7 @@ struct reset_controller_dev {
         struct module *owner;
         struct list_head list;
         struct list_head reset_control_head;
+        struct device *dev;
         struct device_node *of_node;
         int of_reset_n_cells;
         int (*of_xlate)(struct reset_controller_dev *rcdev,
@@ -58,4 +85,7 @@ struct device;
 int devm_reset_controller_register(struct device *dev,
                                    struct reset_controller_dev *rcdev);
 
+void reset_controller_add_lookup(struct reset_control_lookup *lookup,
+                                 unsigned int num_entries);
+
 #endif