[U-Boot] [PATCH v2 4/9] dm: reset: add stm32 reset driver
patrice.chotard at st.com
patrice.chotard at st.com
Wed Sep 13 16:00:07 UTC 2017
From: Patrice Chotard <patrice.chotard at st.com>
This driver is adapted from linux drivers/reset/reset-stm32.c
It's compatible with STM32 F4/F7/H7 SoCs.
This driver doesn't implement .of_match as it's binded
by MFD RCC driver.
To add support for each SoC family, a SoC's specific
include/dt-binfings/mfd/stm32xx-rcc.h file must be added.
This patch only includes stm32h7-rcc.h dedicated for STM32H7 SoCs.
Other SoCs support will be added in the future.
Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
---
doc/device-tree-bindings/reset/st,stm32-rcc.txt | 6 ++
drivers/reset/Kconfig | 7 ++
drivers/reset/Makefile | 1 +
drivers/reset/stm32-reset.c | 80 ++++++++++++++
include/dt-bindings/mfd/stm32h7-rcc.h | 138 ++++++++++++++++++++++++
5 files changed, 232 insertions(+)
create mode 100644 doc/device-tree-bindings/reset/st,stm32-rcc.txt
create mode 100644 drivers/reset/stm32-reset.c
create mode 100644 include/dt-bindings/mfd/stm32h7-rcc.h
diff --git a/doc/device-tree-bindings/reset/st,stm32-rcc.txt b/doc/device-tree-bindings/reset/st,stm32-rcc.txt
new file mode 100644
index 0000000..01db343
--- /dev/null
+++ b/doc/device-tree-bindings/reset/st,stm32-rcc.txt
@@ -0,0 +1,6 @@
+STMicroelectronics STM32 Peripheral Reset Controller
+====================================================
+
+The RCC IP is both a reset and a clock controller.
+
+Please see Documentation/devicetree/bindings/clock/st,stm32-rcc.txt
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index e6af7da..ce46e27 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -28,6 +28,13 @@ config STI_RESET
Say Y if you want to control reset signals provided by system config
block.
+config STM32_RESET
+ bool "Enable the STM32 reset"
+ depends on STM32
+ help
+ Support for reset controllers on STMicroelectronics STM32 family SoCs.
+ This resset driver is compatible with STM32 F4/F7 and H7 SoCs.
+
config TEGRA_CAR_RESET
bool "Enable Tegra CAR-based reset driver"
depends on TEGRA_CAR
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index d5e06c2..252cefe 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_DM_RESET) += reset-uclass.o
obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset.o
obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset-test.o
obj-$(CONFIG_STI_RESET) += sti-reset.o
+obj-$(CONFIG_STM32_RESET) += stm32-reset.o
obj-$(CONFIG_TEGRA_CAR_RESET) += tegra-car-reset.o
obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o
obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
diff --git a/drivers/reset/stm32-reset.c b/drivers/reset/stm32-reset.c
new file mode 100644
index 0000000..9c627d8
--- /dev/null
+++ b/drivers/reset/stm32-reset.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ * Author(s): Patrice CHOTARD, <patrice.chotard at st.com> for STMicroelectronics.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <reset-uclass.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct stm32_reset_priv {
+ fdt_addr_t base;
+};
+
+static int stm32_reset_request(struct reset_ctl *reset_ctl)
+{
+ return 0;
+}
+
+static int stm32_reset_free(struct reset_ctl *reset_ctl)
+{
+ return 0;
+}
+
+static int stm32_reset_assert(struct reset_ctl *reset_ctl)
+{
+ struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
+ int offset = reset_ctl->id % BITS_PER_LONG;
+ debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
+ reset_ctl->id, bank, offset);
+
+ setbits_le32(priv->base + bank, BIT(offset));
+
+ return 0;
+}
+
+static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
+{
+ struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
+ int offset = reset_ctl->id % BITS_PER_LONG;
+ debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
+ reset_ctl->id, bank, offset);
+
+ clrbits_le32(priv->base + bank, BIT(offset));
+
+ return 0;
+}
+
+static const struct reset_ops stm32_reset_ops = {
+ .request = stm32_reset_request,
+ .free = stm32_reset_free,
+ .rst_assert = stm32_reset_assert,
+ .rst_deassert = stm32_reset_deassert,
+};
+
+static int stm32_reset_probe(struct udevice *dev)
+{
+ struct stm32_reset_priv *priv = dev_get_priv(dev);
+
+ priv->base = devfdt_get_addr(dev);
+ if (priv->base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ return 0;
+}
+
+U_BOOT_DRIVER(stm32_rcc_reset) = {
+ .name = "stm32_rcc_reset",
+ .id = UCLASS_RESET,
+ .probe = stm32_reset_probe,
+ .priv_auto_alloc_size = sizeof(struct stm32_reset_priv),
+ .ops = &stm32_reset_ops,
+};
diff --git a/include/dt-bindings/mfd/stm32h7-rcc.h b/include/dt-bindings/mfd/stm32h7-rcc.h
new file mode 100644
index 0000000..b96b3c3
--- /dev/null
+++ b/include/dt-bindings/mfd/stm32h7-rcc.h
@@ -0,0 +1,138 @@
+/*
+ * This header provides constants for the STM32H7 RCC IP
+ */
+
+#ifndef _DT_BINDINGS_MFD_STM32H7_RCC_H
+#define _DT_BINDINGS_MFD_STM32H7_RCC_H
+
+/* AHB3 */
+#define STM32H7_RCC_AHB3_MDMA 0
+#define STM32H7_RCC_AHB3_DMA2D 4
+#define STM32H7_RCC_AHB3_JPGDEC 5
+#define STM32H7_RCC_AHB3_FMC 12
+#define STM32H7_RCC_AHB3_QUADSPI 14
+#define STM32H7_RCC_AHB3_SDMMC1 16
+#define STM32H7_RCC_AHB3_CPU1 31
+
+#define STM32H7_AHB3_RESET(bit) (STM32H7_RCC_AHB3_##bit + (0x7C * 8))
+
+/* AHB1 */
+#define STM32H7_RCC_AHB1_DMA1 0
+#define STM32H7_RCC_AHB1_DMA2 1
+#define STM32H7_RCC_AHB1_ADC12 5
+#define STM32H7_RCC_AHB1_ART 14
+#define STM32H7_RCC_AHB1_ETH1MAC 15
+#define STM32H7_RCC_AHB1_USB1OTG 25
+#define STM32H7_RCC_AHB1_USB2OTG 27
+#define STM32H7_RCC_AHB1_CPU2 31
+
+#define STM32H7_AHB1_RESET(bit) (STM32H7_RCC_AHB1_##bit + (0x80 * 8))
+
+/* AHB2 */
+#define STM32H7_RCC_AHB2_CAMITF 0
+#define STM32H7_RCC_AHB2_CRYPT 4
+#define STM32H7_RCC_AHB2_HASH 5
+#define STM32H7_RCC_AHB2_RNG 6
+#define STM32H7_RCC_AHB2_SDMMC2 9
+
+#define STM32H7_AHB2_RESET(bit) (STM32H7_RCC_AHB2_##bit + (0x84 * 8))
+
+/* AHB4 */
+#define STM32H7_RCC_AHB4_GPIOA 0
+#define STM32H7_RCC_AHB4_GPIOB 1
+#define STM32H7_RCC_AHB4_GPIOC 2
+#define STM32H7_RCC_AHB4_GPIOD 3
+#define STM32H7_RCC_AHB4_GPIOE 4
+#define STM32H7_RCC_AHB4_GPIOF 5
+#define STM32H7_RCC_AHB4_GPIOG 6
+#define STM32H7_RCC_AHB4_GPIOH 7
+#define STM32H7_RCC_AHB4_GPIOI 8
+#define STM32H7_RCC_AHB4_GPIOJ 9
+#define STM32H7_RCC_AHB4_GPIOK 10
+#define STM32H7_RCC_AHB4_CRC 19
+#define STM32H7_RCC_AHB4_BDMA 21
+#define STM32H7_RCC_AHB4_ADC3 24
+#define STM32H7_RCC_AHB4_HSEM 25
+
+#define STM32H7_AHB4_RESET(bit) (STM32H7_RCC_AHB4_##bit + (0x88 * 8))
+
+
+/* APB3 */
+#define STM32H7_RCC_APB3_LTDC 3
+#define STM32H7_RCC_APB3_DSI 4
+
+#define STM32H7_APB3_RESET(bit) (STM32H7_RCC_APB3_##bit + (0x8C * 8))
+
+/* APB1L */
+#define STM32H7_RCC_APB1L_TIM2 0
+#define STM32H7_RCC_APB1L_TIM3 1
+#define STM32H7_RCC_APB1L_TIM4 2
+#define STM32H7_RCC_APB1L_TIM5 3
+#define STM32H7_RCC_APB1L_TIM6 4
+#define STM32H7_RCC_APB1L_TIM7 5
+#define STM32H7_RCC_APB1L_TIM12 6
+#define STM32H7_RCC_APB1L_TIM13 7
+#define STM32H7_RCC_APB1L_TIM14 8
+#define STM32H7_RCC_APB1L_LPTIM1 9
+#define STM32H7_RCC_APB1L_SPI2 14
+#define STM32H7_RCC_APB1L_SPI3 15
+#define STM32H7_RCC_APB1L_SPDIF_RX 16
+#define STM32H7_RCC_APB1L_USART2 17
+#define STM32H7_RCC_APB1L_USART3 18
+#define STM32H7_RCC_APB1L_UART4 19
+#define STM32H7_RCC_APB1L_UART5 20
+#define STM32H7_RCC_APB1L_I2C1 21
+#define STM32H7_RCC_APB1L_I2C2 22
+#define STM32H7_RCC_APB1L_I2C3 23
+#define STM32H7_RCC_APB1L_HDMICEC 27
+#define STM32H7_RCC_APB1L_DAC12 29
+#define STM32H7_RCC_APB1L_USART7 30
+#define STM32H7_RCC_APB1L_USART8 31
+
+#define STM32H7_APB1L_RESET(bit) (STM32H7_RCC_APB1L_##bit + (0x90 * 8))
+
+/* APB1H */
+#define STM32H7_RCC_APB1H_CRS 1
+#define STM32H7_RCC_APB1H_SWP 2
+#define STM32H7_RCC_APB1H_OPAMP 4
+#define STM32H7_RCC_APB1H_MDIOS 5
+#define STM32H7_RCC_APB1H_FDCAN 8
+
+#define STM32H7_APB1H_RESET(bit) (STM32H7_RCC_APB1H_##bit + (0x94 * 8))
+
+/* APB2 */
+#define STM32H7_RCC_APB2_TIM1 0
+#define STM32H7_RCC_APB2_TIM8 1
+#define STM32H7_RCC_APB2_USART1 4
+#define STM32H7_RCC_APB2_USART6 5
+#define STM32H7_RCC_APB2_SPI1 12
+#define STM32H7_RCC_APB2_SPI4 13
+#define STM32H7_RCC_APB2_TIM15 16
+#define STM32H7_RCC_APB2_TIM16 17
+#define STM32H7_RCC_APB2_TIM17 18
+#define STM32H7_RCC_APB2_SPI5 20
+#define STM32H7_RCC_APB2_SAI1 22
+#define STM32H7_RCC_APB2_SAI2 23
+#define STM32H7_RCC_APB2_SAI3 24
+#define STM32H7_RCC_APB2_DFSDM1 28
+#define STM32H7_RCC_APB2_HRTIM 29
+
+#define STM32H7_APB2_RESET(bit) (STM32H7_RCC_APB2_##bit + (0x98 * 8))
+
+/* APB4 */
+#define STM32H7_RCC_APB4_SYSCFG 1
+#define STM32H7_RCC_APB4_LPUART1 3
+#define STM32H7_RCC_APB4_SPI6 5
+#define STM32H7_RCC_APB4_I2C4 7
+#define STM32H7_RCC_APB4_LPTIM2 9
+#define STM32H7_RCC_APB4_LPTIM3 10
+#define STM32H7_RCC_APB4_LPTIM4 11
+#define STM32H7_RCC_APB4_LPTIM5 12
+#define STM32H7_RCC_APB4_COMP12 14
+#define STM32H7_RCC_APB4_VREF 15
+#define STM32H7_RCC_APB4_SAI4 21
+#define STM32H7_RCC_APB4_TMPSENS 26
+
+#define STM32H7_APB4_RESET(bit) (STM32H7_RCC_APB4_##bit + (0x9C * 8))
+
+#endif /* _DT_BINDINGS_MFD_STM32H7_RCC_H */
--
1.9.1
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