stm32mp1: Add clock and reset support

The clock driver is under dual license, BSD and GPLv2.
The clock driver uses device tree, so a minimal support for this is added.
The required files for driver and DTS files are in include/dt-bindings/.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>

drivers/st/clk/stm32mp1_clkfunc.c

@@ -0,0 +1,365 @@
+/*
+ * Copyright (c) 2017-2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <dt-bindings/clock/stm32mp1-clksrc.h>
+#include <errno.h>
+#include <libfdt.h>
+#include <stm32mp1_clk.h>
+#include <stm32mp1_clkfunc.h>
+#include <stm32mp1_dt.h>
+
+#define DT_RCC_NODE_NAME	"rcc@50000000"
+#define DT_RCC_CLK_COMPAT	"st,stm32mp1-rcc"
+#define DT_RCC_COMPAT		"syscon"
+#define DT_STGEN_COMPAT		"st,stm32-stgen"
+#define DT_UART_COMPAT		"st,stm32h7-uart"
+#define DT_USART_COMPAT		"st,stm32h7-usart"
+
+const char *stm32mp_osc_node_label[NB_OSC] = {
+	[_LSI] = "clk-lsi",
+	[_LSE] = "clk-lse",
+	[_HSI] = "clk-hsi",
+	[_HSE] = "clk-hse",
+	[_CSI] = "clk-csi",
+	[_I2S_CKIN] = "i2s_ckin",
+	[_USB_PHY_48] = "ck_usbo_48m"
+};
+
+/*******************************************************************************
+ * This function reads the frequency of an oscillator from its name.
+ * It reads the value indicated inside the device tree.
+ * Returns 0 if success, and a negative value else.
+ * If success, value is stored in the second parameter.
+ ******************************************************************************/
+int fdt_osc_read_freq(const char *name, uint32_t *freq)
+{
+	int node, subnode;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return -ENOENT;
+	}
+
+	node = fdt_path_offset(fdt, "/clocks");
+	if (node < 0) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	fdt_for_each_subnode(subnode, fdt, node) {
+		const char *cchar;
+		int ret;
+
+		cchar = fdt_get_name(fdt, subnode, &ret);
+		if (cchar == NULL) {
+			return ret;
+		}
+
+		if (strncmp(cchar, name, (size_t)ret) == 0) {
+			const fdt32_t *cuint;
+
+			cuint = fdt_getprop(fdt, subnode, "clock-frequency",
+					    &ret);
+			if (cuint == NULL) {
+				return ret;
+			}
+
+			*freq = fdt32_to_cpu(*cuint);
+
+			return 0;
+		}
+	}
+
+	/* Oscillator not found, freq=0 */
+	*freq = 0;
+	return 0;
+}
+
+/*******************************************************************************
+ * This function checks the presence of an oscillator property from its id.
+ * The search is done inside the device tree.
+ * Returns true/false regarding search result.
+ ******************************************************************************/
+bool fdt_osc_read_bool(enum stm32mp_osc_id osc_id, const char *prop_name)
+{
+	int node, subnode;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return false;
+	}
+
+	if (osc_id >= NB_OSC) {
+		return false;
+	}
+
+	node = fdt_path_offset(fdt, "/clocks");
+	if (node < 0) {
+		return false;
+	}
+
+	fdt_for_each_subnode(subnode, fdt, node) {
+		const char *cchar;
+		int ret;
+
+		cchar = fdt_get_name(fdt, subnode, &ret);
+		if (cchar == NULL) {
+			return false;
+		}
+
+		if (strncmp(cchar, stm32mp_osc_node_label[osc_id],
+			    (size_t)ret) != 0) {
+			continue;
+		}
+
+		if (fdt_getprop(fdt, subnode, prop_name, NULL) != NULL) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
+/*******************************************************************************
+ * This function reads a value of a oscillator property from its id.
+ * Returns value if success, and a default value if property not found.
+ * Default value is passed as parameter.
+ ******************************************************************************/
+uint32_t fdt_osc_read_uint32_default(enum stm32mp_osc_id osc_id,
+				     const char *prop_name, uint32_t dflt_value)
+{
+	int node, subnode;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return dflt_value;
+	}
+
+	if (osc_id >= NB_OSC) {
+		return dflt_value;
+	}
+
+	node = fdt_path_offset(fdt, "/clocks");
+	if (node < 0) {
+		return dflt_value;
+	}
+
+	fdt_for_each_subnode(subnode, fdt, node) {
+		const char *cchar;
+		int ret;
+
+		cchar = fdt_get_name(fdt, subnode, &ret);
+		if (cchar == NULL) {
+			return dflt_value;
+		}
+
+		if (strncmp(cchar, stm32mp_osc_node_label[osc_id],
+			    (size_t)ret) != 0) {
+			continue;
+		}
+
+		return fdt_read_uint32_default(subnode, prop_name, dflt_value);
+	}
+
+	return dflt_value;
+}
+
+/*******************************************************************************
+ * This function reads the rcc base address.
+ * It reads the value indicated inside the device tree.
+ * Returns address if success, and 0 value else.
+ ******************************************************************************/
+uint32_t fdt_rcc_read_addr(void)
+{
+	int node, subnode;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return 0;
+	}
+
+	node = fdt_path_offset(fdt, "/soc");
+	if (node < 0) {
+		return 0;
+	}
+
+	fdt_for_each_subnode(subnode, fdt, node) {
+		const char *cchar;
+		int ret;
+
+		cchar = fdt_get_name(fdt, subnode, &ret);
+		if (cchar == NULL) {
+			return 0;
+		}
+
+		if (strncmp(cchar, DT_RCC_NODE_NAME, (size_t)ret) == 0) {
+			const fdt32_t *cuint;
+
+			cuint = fdt_getprop(fdt, subnode, "reg", NULL);
+			if (cuint == NULL) {
+				return 0;
+			}
+
+			return fdt32_to_cpu(*cuint);
+		}
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+ * This function reads a series of parameters in rcc-clk section.
+ * It reads the values indicated inside the device tree, from property name.
+ * The number of parameters is also indicated as entry parameter.
+ * Returns 0 if success, and a negative value else.
+ * If success, values are stored at the second parameter address.
+ ******************************************************************************/
+int fdt_rcc_read_uint32_array(const char *prop_name,
+			      uint32_t *array, uint32_t count)
+{
+	int node;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return -ENOENT;
+	}
+
+	node = fdt_node_offset_by_compatible(fdt, -1, DT_RCC_CLK_COMPAT);
+	if (node < 0) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	return fdt_read_uint32_array(node, prop_name, array, count);
+}
+
+/*******************************************************************************
+ * This function gets the subnode offset in rcc-clk section from its name.
+ * It reads the values indicated inside the device tree.
+ * Returns offset if success, and a negative value else.
+ ******************************************************************************/
+int fdt_rcc_subnode_offset(const char *name)
+{
+	int node, subnode;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return -ENOENT;
+	}
+
+	node = fdt_node_offset_by_compatible(fdt, -1, DT_RCC_CLK_COMPAT);
+	if (node < 0) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	subnode = fdt_subnode_offset(fdt, node, name);
+	if (subnode <= 0) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	return subnode;
+}
+
+/*******************************************************************************
+ * This function gets the pointer to a rcc-clk property from its name.
+ * It reads the values indicated inside the device tree.
+ * Length of the property is stored in the second parameter.
+ * Returns pointer if success, and NULL value else.
+ ******************************************************************************/
+const uint32_t *fdt_rcc_read_prop(const char *prop_name, int *lenp)
+{
+	const uint32_t *cuint;
+	int node, len;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return NULL;
+	}
+
+	node = fdt_node_offset_by_compatible(fdt, -1, DT_RCC_CLK_COMPAT);
+	if (node < 0) {
+		return NULL;
+	}
+
+	cuint = fdt_getprop(fdt, node, prop_name, &len);
+	if (cuint == NULL) {
+		return NULL;
+	}
+
+	*lenp = len;
+	return cuint;
+}
+
+/*******************************************************************************
+ * This function gets the secure status for rcc node.
+ * It reads secure-status in device tree.
+ * Returns 1 if rcc is available from secure world, 0 else.
+ ******************************************************************************/
+bool fdt_get_rcc_secure_status(void)
+{
+	int node;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return false;
+	}
+
+	node = fdt_node_offset_by_compatible(fdt, -1, DT_RCC_COMPAT);
+	if (node < 0) {
+		return false;
+	}
+
+	return fdt_check_secure_status(node);
+}
+
+/*******************************************************************************
+ * This function reads the stgen base address.
+ * It reads the value indicated inside the device tree.
+ * Returns address if success, and NULL value else.
+ ******************************************************************************/
+uintptr_t fdt_get_stgen_base(void)
+{
+	int node;
+	const fdt32_t *cuint;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return 0;
+	}
+
+	node = fdt_node_offset_by_compatible(fdt, -1, DT_STGEN_COMPAT);
+	if (node < 0) {
+		return 0;
+	}
+
+	cuint = fdt_getprop(fdt, node, "reg", NULL);
+	if (cuint == NULL) {
+		return 0;
+	}
+
+	return fdt32_to_cpu(*cuint);
+}
+
+/*******************************************************************************
+ * This function gets the clock ID of the given node.
+ * It reads the value indicated inside the device tree.
+ * Returns ID if success, and a negative value else.
+ ******************************************************************************/
+int fdt_get_clock_id(int node)
+{
+	const fdt32_t *cuint;
+	void *fdt;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return -ENOENT;
+	}
+
+	cuint = fdt_getprop(fdt, node, "clocks", NULL);
+	if (cuint == NULL) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	cuint++;
+	return (int)fdt32_to_cpu(*cuint);
+}

drivers/st/reset/stm32mp1_reset.c

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <bl_common.h>
+#include <debug.h>
+#include <limits.h>
+#include <mmio.h>
+#include <platform_def.h>
+#include <stm32mp1_rcc.h>
+#include <stm32mp1_reset.h>
+#include <utils_def.h>
+
+#define RST_CLR_OFFSET	4U
+
+void stm32mp1_reset_assert(uint32_t id)
+{
+	uint32_t offset = (id / (uint32_t)__LONG_BIT) * sizeof(uintptr_t);
+	uint32_t bit = id % (uint32_t)__LONG_BIT;
+
+	mmio_write_32(RCC_BASE + offset, BIT(bit));
+	while ((mmio_read_32(RCC_BASE + offset) & BIT(bit)) == 0U) {
+		;
+	}
+}
+
+void stm32mp1_reset_deassert(uint32_t id)
+{
+	uint32_t offset = ((id / (uint32_t)__LONG_BIT) * sizeof(uintptr_t)) +
+			  RST_CLR_OFFSET;
+	uint32_t bit = id % (uint32_t)__LONG_BIT;
+
+	mmio_write_32(RCC_BASE + offset, BIT(bit));
+	while ((mmio_read_32(RCC_BASE + offset) & BIT(bit)) != 0U) {
+		;
+	}
+}

include/drivers/st/stm32mp1_clk.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __STM32MP1_CLK_H__
+#define __STM32MP1_CLK_H__
+
+#include <arch_helpers.h>
+#include <stdbool.h>
+
+int stm32mp1_clk_probe(void);
+int stm32mp1_clk_init(void);
+bool stm32mp1_clk_is_enabled(unsigned long id);
+int stm32mp1_clk_enable(unsigned long id);
+int stm32mp1_clk_disable(unsigned long id);
+unsigned long stm32mp1_clk_get_rate(unsigned long id);
+void stm32mp1_stgen_increment(unsigned long long offset_in_ms);
+
+static inline uint32_t get_timer(uint32_t base)
+{
+	if (base == 0U) {
+		return (uint32_t)(~read_cntpct_el0());
+	}
+
+	return base - (uint32_t)(~read_cntpct_el0());
+}
+
+#endif /* __STM32MP1_CLK_H__ */

include/drivers/st/stm32mp1_clkfunc.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2017-2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __STM32MP1_CLKFUNC_H__
+#define __STM32MP1_CLKFUNC_H__
+
+#include <stdbool.h>
+
+enum stm32mp_osc_id {
+	_HSI,
+	_HSE,
+	_CSI,
+	_LSI,
+	_LSE,
+	_I2S_CKIN,
+	_USB_PHY_48,
+	NB_OSC,
+	_UNKNOWN_OSC_ID = 0xFF
+};
+
+extern const char *stm32mp_osc_node_label[NB_OSC];
+
+int fdt_osc_read_freq(const char *name, uint32_t *freq);
+bool fdt_osc_read_bool(enum stm32mp_osc_id osc_id, const char *prop_name);
+uint32_t fdt_osc_read_uint32_default(enum stm32mp_osc_id osc_id,
+				     const char *prop_name,
+				     uint32_t dflt_value);
+
+uint32_t fdt_rcc_read_addr(void);
+int fdt_rcc_read_uint32_array(const char *prop_name,
+			      uint32_t *array, uint32_t count);
+int fdt_rcc_subnode_offset(const char *name);
+const uint32_t *fdt_rcc_read_prop(const char *prop_name, int *lenp);
+bool fdt_get_rcc_secure_status(void);
+
+uintptr_t fdt_get_stgen_base(void);
+int fdt_get_clock_id(int node);
+
+#endif /* __STM32MP1_CLKFUNC_H__ */

include/drivers/st/stm32mp1_reset.h

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __STM32MP1_RESET_H__
+#define __STM32MP1_RESET_H__
+
+#include <stdint.h>
+
+void stm32mp1_reset_assert(uint32_t reset_id);
+void stm32mp1_reset_deassert(uint32_t reset_id);
+
+#endif /* __STM32MP1_RESET_H__ */

include/dt-bindings/clock/stm32mp1-clks.h

@@ -0,0 +1,251 @@
+/* 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_CLKS_H_
+#define _DT_BINDINGS_STM32MP1_CLKS_H_
+
+/* OSCILLATOR clocks */
+#define CK_HSE		0
+#define CK_CSI		1
+#define CK_LSI		2
+#define CK_LSE		3
+#define CK_HSI		4
+#define CK_HSE_DIV2	5
+
+/* Bus clocks */
+#define TIM2		6
+#define TIM3		7
+#define TIM4		8
+#define TIM5		9
+#define TIM6		10
+#define TIM7		11
+#define TIM12		12
+#define TIM13		13
+#define TIM14		14
+#define LPTIM1		15
+#define SPI2		16
+#define SPI3		17
+#define USART2		18
+#define USART3		19
+#define UART4		20
+#define UART5		21
+#define UART7		22
+#define UART8		23
+#define I2C1		24
+#define I2C2		25
+#define I2C3		26
+#define I2C5		27
+#define SPDIF		28
+#define CEC		29
+#define DAC12		30
+#define MDIO		31
+#define TIM1		32
+#define TIM8		33
+#define TIM15		34
+#define TIM16		35
+#define TIM17		36
+#define SPI1		37
+#define SPI4		38
+#define SPI5		39
+#define USART6		40
+#define SAI1		41
+#define SAI2		42
+#define SAI3		43
+#define DFSDM		44
+#define FDCAN		45
+#define LPTIM2		46
+#define LPTIM3		47
+#define LPTIM4		48
+#define LPTIM5		49
+#define SAI4		50
+#define SYSCFG		51
+#define VREF		52
+#define TMPSENS		53
+#define PMBCTRL		54
+#define HDP		55
+#define LTDC		56
+#define DSI		57
+#define IWDG2		58
+#define USBPHY		59
+#define STGENRO		60
+#define SPI6		61
+#define I2C4		62
+#define I2C6		63
+#define USART1		64
+#define RTCAPB		65
+#define TZC1		66
+#define TZPC		67
+#define IWDG1		68
+#define BSEC		69
+#define STGEN		70
+#define DMA1		71
+#define DMA2		72
+#define DMAMUX		73
+#define ADC12		74
+#define USBO		75
+#define SDMMC3		76
+#define DCMI		77
+#define CRYP2		78
+#define HASH2		79
+#define RNG2		80
+#define CRC2		81
+#define HSEM		82
+#define IPCC		83
+#define GPIOA		84
+#define GPIOB		85
+#define GPIOC		86
+#define GPIOD		87
+#define GPIOE		88
+#define GPIOF		89
+#define GPIOG		90
+#define GPIOH		91
+#define GPIOI		92
+#define GPIOJ		93
+#define GPIOK		94
+#define GPIOZ		95
+#define CRYP1		96
+#define HASH1		97
+#define RNG1		98
+#define BKPSRAM		99
+#define MDMA		100
+#define GPU		101
+#define ETHCK		102
+#define ETHTX		103
+#define ETHRX		104
+#define ETHMAC		105
+#define FMC		106
+#define QSPI		107
+#define SDMMC1		108
+#define SDMMC2		109
+#define CRC1		110
+#define USBH		111
+#define ETHSTP		112
+#define TZC2		113
+
+/* Kernel clocks */
+#define SDMMC1_K	118
+#define SDMMC2_K	119
+#define SDMMC3_K	120
+#define FMC_K		121
+#define QSPI_K		122
+#define ETHCK_K		123
+#define RNG1_K		124
+#define RNG2_K		125
+#define GPU_K		126
+#define USBPHY_K	127
+#define STGEN_K		128
+#define SPDIF_K		129
+#define SPI1_K		130
+#define SPI2_K		131
+#define SPI3_K		132
+#define SPI4_K		133
+#define SPI5_K		134
+#define SPI6_K		135
+#define CEC_K		136
+#define I2C1_K		137
+#define I2C2_K		138
+#define I2C3_K		139
+#define I2C4_K		140
+#define I2C5_K		141
+#define I2C6_K		142
+#define LPTIM1_K	143
+#define LPTIM2_K	144
+#define LPTIM3_K	145
+#define LPTIM4_K	146
+#define LPTIM5_K	147
+#define USART1_K	148
+#define USART2_K	149
+#define USART3_K	150
+#define UART4_K		151
+#define UART5_K		152
+#define USART6_K	153
+#define UART7_K		154
+#define UART8_K		155
+#define DFSDM_K		156
+#define FDCAN_K		157
+#define SAI1_K		158
+#define SAI2_K		159
+#define SAI3_K		160
+#define SAI4_K		161
+#define ADC12_K		162
+#define DSI_K		163
+#define DSI_PX		164
+#define ADFSDM_K	165
+#define USBO_K		166
+#define LTDC_PX		167
+#define DAC12_K		168
+#define ETHPTP_K	169
+
+/* PLL */
+#define PLL1		176
+#define PLL2		177
+#define PLL3		178
+#define PLL4		179
+
+/* ODF */
+#define PLL1_P		180
+#define PLL1_Q		181
+#define PLL1_R		182
+#define PLL2_P		183
+#define PLL2_Q		184
+#define PLL2_R		185
+#define PLL3_P		186
+#define PLL3_Q		187
+#define PLL3_R		188
+#define PLL4_P		189
+#define PLL4_Q		190
+#define PLL4_R		191
+
+/* AUX */
+#define RTC		192
+
+/* MCLK */
+#define CK_PER		193
+#define CK_MPU		194
+#define CK_AXI		195
+#define CK_MCU		196
+
+/* Time base */
+#define TIM2_K		197
+#define TIM3_K		198
+#define TIM4_K		199
+#define TIM5_K		200
+#define TIM6_K		201
+#define TIM7_K		202
+#define TIM12_K		203
+#define TIM13_K		204
+#define TIM14_K		205
+#define TIM1_K		206
+#define TIM8_K		207
+#define TIM15_K		208
+#define TIM16_K		209
+#define TIM17_K		210
+
+/* MCO clocks */
+#define CK_MCO1		211
+#define CK_MCO2		212
+
+/* TRACE & DEBUG clocks */
+#define CK_DBG		214
+#define CK_TRACE	215
+
+/* DDR */
+#define DDRC1		220
+#define DDRC1LP		221
+#define DDRC2		222
+#define DDRC2LP		223
+#define DDRPHYC		224
+#define DDRPHYCLP	225
+#define DDRCAPB		226
+#define DDRCAPBLP	227
+#define AXIDCG		228
+#define DDRPHYCAPB	229
+#define DDRPHYCAPBLP	230
+#define DDRPERFM	231
+
+#define STM32MP1_LAST_CLK 232
+
+#endif /* _DT_BINDINGS_STM32MP1_CLKS_H_ */

include/dt-bindings/clock/stm32mp1-clksrc.h

@@ -0,0 +1,283 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
+/*
+ * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
+ */
+
+#ifndef _DT_BINDINGS_CLOCK_STM32MP1_CLKSRC_H_
+#define _DT_BINDINGS_CLOCK_STM32MP1_CLKSRC_H_
+
+/* PLL output is enable when x=1, with x=p,q or r */
+#define PQR(p, q, r)	(((p) & 1) | (((q) & 1) << 1) | (((r) & 1) << 2))
+
+/* st,clksrc: mandatory clock source */
+
+#define CLK_MPU_HSI		0x00000200
+#define CLK_MPU_HSE		0x00000201
+#define CLK_MPU_PLL1P		0x00000202
+#define CLK_MPU_PLL1P_DIV	0x00000203
+
+#define CLK_AXI_HSI		0x00000240
+#define CLK_AXI_HSE		0x00000241
+#define CLK_AXI_PLL2P		0x00000242
+
+#define CLK_MCU_HSI		0x00000480
+#define CLK_MCU_HSE		0x00000481
+#define CLK_MCU_CSI		0x00000482
+#define CLK_MCU_PLL3P		0x00000483
+
+#define CLK_PLL12_HSI		0x00000280
+#define CLK_PLL12_HSE		0x00000281
+
+#define CLK_PLL3_HSI		0x00008200
+#define CLK_PLL3_HSE		0x00008201
+#define CLK_PLL3_CSI		0x00008202
+
+#define CLK_PLL4_HSI		0x00008240
+#define CLK_PLL4_HSE		0x00008241
+#define CLK_PLL4_CSI		0x00008242
+#define CLK_PLL4_I2SCKIN	0x00008243
+
+#define CLK_RTC_DISABLED	0x00001400
+#define CLK_RTC_LSE		0x00001401
+#define CLK_RTC_LSI		0x00001402
+#define CLK_RTC_HSE		0x00001403
+
+#define CLK_MCO1_HSI		0x00008000
+#define CLK_MCO1_HSE		0x00008001
+#define CLK_MCO1_CSI		0x00008002
+#define CLK_MCO1_LSI		0x00008003
+#define CLK_MCO1_LSE		0x00008004
+#define CLK_MCO1_DISABLED	0x0000800F
+
+#define CLK_MCO2_MPU		0x00008040
+#define CLK_MCO2_AXI		0x00008041
+#define CLK_MCO2_MCU		0x00008042
+#define CLK_MCO2_PLL4P		0x00008043
+#define CLK_MCO2_HSE		0x00008044
+#define CLK_MCO2_HSI		0x00008045
+#define CLK_MCO2_DISABLED	0x0000804F
+
+/* st,pkcs: peripheral kernel clock source */
+
+#define CLK_I2C12_PCLK1		0x00008C00
+#define CLK_I2C12_PLL4R		0x00008C01
+#define CLK_I2C12_HSI		0x00008C02
+#define CLK_I2C12_CSI		0x00008C03
+#define CLK_I2C12_DISABLED	0x00008C07
+
+#define CLK_I2C35_PCLK1		0x00008C40
+#define CLK_I2C35_PLL4R		0x00008C41
+#define CLK_I2C35_HSI		0x00008C42
+#define CLK_I2C35_CSI		0x00008C43
+#define CLK_I2C35_DISABLED	0x00008C47
+
+#define CLK_I2C46_PCLK5		0x00000C00
+#define CLK_I2C46_PLL3Q		0x00000C01
+#define CLK_I2C46_HSI		0x00000C02
+#define CLK_I2C46_CSI		0x00000C03
+#define CLK_I2C46_DISABLED	0x00000C07
+
+#define CLK_SAI1_PLL4Q		0x00008C80
+#define CLK_SAI1_PLL3Q		0x00008C81
+#define CLK_SAI1_I2SCKIN	0x00008C82
+#define CLK_SAI1_CKPER		0x00008C83
+#define CLK_SAI1_PLL3R		0x00008C84
+#define CLK_SAI1_DISABLED	0x00008C87
+
+#define CLK_SAI2_PLL4Q		0x00008CC0
+#define CLK_SAI2_PLL3Q		0x00008CC1
+#define CLK_SAI2_I2SCKIN	0x00008CC2
+#define CLK_SAI2_CKPER		0x00008CC3
+#define CLK_SAI2_SPDIF		0x00008CC4
+#define CLK_SAI2_PLL3R		0x00008CC5
+#define CLK_SAI2_DISABLED	0x00008CC7
+
+#define CLK_SAI3_PLL4Q		0x00008D00
+#define CLK_SAI3_PLL3Q		0x00008D01
+#define CLK_SAI3_I2SCKIN	0x00008D02
+#define CLK_SAI3_CKPER		0x00008D03
+#define CLK_SAI3_PLL3R		0x00008D04
+#define CLK_SAI3_DISABLED	0x00008D07
+
+#define CLK_SAI4_PLL4Q		0x00008D40
+#define CLK_SAI4_PLL3Q		0x00008D41
+#define CLK_SAI4_I2SCKIN	0x00008D42
+#define CLK_SAI4_CKPER		0x00008D43
+#define CLK_SAI4_PLL3R		0x00008D44
+#define CLK_SAI4_DISABLED	0x00008D47
+
+#define CLK_SPI2S1_PLL4P	0x00008D80
+#define CLK_SPI2S1_PLL3Q	0x00008D81
+#define CLK_SPI2S1_I2SCKIN	0x00008D82
+#define CLK_SPI2S1_CKPER	0x00008D83
+#define CLK_SPI2S1_PLL3R	0x00008D84
+#define CLK_SPI2S1_DISABLED	0x00008D87
+
+#define CLK_SPI2S23_PLL4P	0x00008DC0
+#define CLK_SPI2S23_PLL3Q	0x00008DC1
+#define CLK_SPI2S23_I2SCKIN	0x00008DC2
+#define CLK_SPI2S23_CKPER	0x00008DC3
+#define CLK_SPI2S23_PLL3R	0x00008DC4
+#define CLK_SPI2S23_DISABLED	0x00008DC7
+
+#define CLK_SPI45_PCLK2		0x00008E00
+#define CLK_SPI45_PLL4Q		0x00008E01
+#define CLK_SPI45_HSI		0x00008E02
+#define CLK_SPI45_CSI		0x00008E03
+#define CLK_SPI45_HSE		0x00008E04
+#define CLK_SPI45_DISABLED	0x00008E07
+
+#define CLK_SPI6_PCLK5		0x00000C40
+#define CLK_SPI6_PLL4Q		0x00000C41
+#define CLK_SPI6_HSI		0x00000C42
+#define CLK_SPI6_CSI		0x00000C43
+#define CLK_SPI6_HSE		0x00000C44
+#define CLK_SPI6_PLL3Q		0x00000C45
+#define CLK_SPI6_DISABLED	0x00000C47
+
+#define CLK_UART6_PCLK2		0x00008E40
+#define CLK_UART6_PLL4Q		0x00008E41
+#define CLK_UART6_HSI		0x00008E42
+#define CLK_UART6_CSI		0x00008E43
+#define CLK_UART6_HSE		0x00008E44
+#define CLK_UART6_DISABLED	0x00008E47
+
+#define CLK_UART24_PCLK1	0x00008E80
+#define CLK_UART24_PLL4Q	0x00008E81
+#define CLK_UART24_HSI		0x00008E82
+#define CLK_UART24_CSI		0x00008E83
+#define CLK_UART24_HSE		0x00008E84
+#define CLK_UART24_DISABLED	0x00008E87
+
+#define CLK_UART35_PCLK1	0x00008EC0
+#define CLK_UART35_PLL4Q	0x00008EC1
+#define CLK_UART35_HSI		0x00008EC2
+#define CLK_UART35_CSI		0x00008EC3
+#define CLK_UART35_HSE		0x00008EC4
+#define CLK_UART35_DISABLED	0x00008EC7
+
+#define CLK_UART78_PCLK1	0x00008F00
+#define CLK_UART78_PLL4Q	0x00008F01
+#define CLK_UART78_HSI		0x00008F02
+#define CLK_UART78_CSI		0x00008F03
+#define CLK_UART78_HSE		0x00008F04
+#define CLK_UART78_DISABLED	0x00008F07
+
+#define CLK_UART1_PCLK5		0x00000C80
+#define CLK_UART1_PLL3Q		0x00000C81
+#define CLK_UART1_HSI		0x00000C82
+#define CLK_UART1_CSI		0x00000C83
+#define CLK_UART1_PLL4Q		0x00000C84
+#define CLK_UART1_HSE		0x00000C85
+#define CLK_UART1_DISABLED	0x00000C87
+
+#define CLK_SDMMC12_HCLK6	0x00008F40
+#define CLK_SDMMC12_PLL3R	0x00008F41
+#define CLK_SDMMC12_PLL4P	0x00008F42
+#define CLK_SDMMC12_HSI		0x00008F43
+#define CLK_SDMMC12_DISABLED	0x00008F47
+
+#define CLK_SDMMC3_HCLK2	0x00008F80
+#define CLK_SDMMC3_PLL3R	0x00008F81
+#define CLK_SDMMC3_PLL4P	0x00008F82
+#define CLK_SDMMC3_HSI		0x00008F83
+#define CLK_SDMMC3_DISABLED	0x00008F87
+
+#define CLK_ETH_PLL4P		0x00008FC0
+#define CLK_ETH_PLL3Q		0x00008FC1
+#define CLK_ETH_DISABLED	0x00008FC3
+
+#define CLK_QSPI_ACLK		0x00009000
+#define CLK_QSPI_PLL3R		0x00009001
+#define CLK_QSPI_PLL4P		0x00009002
+#define CLK_QSPI_CKPER		0x00009003
+
+#define CLK_FMC_ACLK		0x00009040
+#define CLK_FMC_PLL3R		0x00009041
+#define CLK_FMC_PLL4P		0x00009042
+#define CLK_FMC_CKPER		0x00009043
+
+#define CLK_FDCAN_HSE		0x000090C0
+#define CLK_FDCAN_PLL3Q		0x000090C1
+#define CLK_FDCAN_PLL4Q		0x000090C2
+#define CLK_FDCAN_PLL4R		0x000090C3
+
+#define CLK_SPDIF_PLL4P		0x00009140
+#define CLK_SPDIF_PLL3Q		0x00009141
+#define CLK_SPDIF_HSI		0x00009142
+#define CLK_SPDIF_DISABLED	0x00009143
+
+#define CLK_CEC_LSE		0x00009180
+#define CLK_CEC_LSI		0x00009181
+#define CLK_CEC_CSI_DIV122	0x00009182
+#define CLK_CEC_DISABLED	0x00009183
+
+#define CLK_USBPHY_HSE		0x000091C0
+#define CLK_USBPHY_PLL4R	0x000091C1
+#define CLK_USBPHY_HSE_DIV2	0x000091C2
+#define CLK_USBPHY_DISABLED	0x000091C3
+
+#define CLK_USBO_PLL4R		0x800091C0
+#define CLK_USBO_USBPHY		0x800091C1
+
+#define CLK_RNG1_CSI		0x00000CC0
+#define CLK_RNG1_PLL4R		0x00000CC1
+#define CLK_RNG1_LSE		0x00000CC2
+#define CLK_RNG1_LSI		0x00000CC3
+
+#define CLK_RNG2_CSI		0x00009200
+#define CLK_RNG2_PLL4R		0x00009201
+#define CLK_RNG2_LSE		0x00009202
+#define CLK_RNG2_LSI		0x00009203
+
+#define CLK_CKPER_HSI		0x00000D00
+#define CLK_CKPER_CSI		0x00000D01
+#define CLK_CKPER_HSE		0x00000D02
+#define CLK_CKPER_DISABLED	0x00000D03
+
+#define CLK_STGEN_HSI		0x00000D40
+#define CLK_STGEN_HSE		0x00000D41
+#define CLK_STGEN_DISABLED	0x00000D43
+
+#define CLK_DSI_DSIPLL		0x00009240
+#define CLK_DSI_PLL4P		0x00009241
+
+#define CLK_ADC_PLL4R		0x00009280
+#define CLK_ADC_CKPER		0x00009281
+#define CLK_ADC_PLL3Q		0x00009282
+#define CLK_ADC_DISABLED	0x00009283
+
+#define CLK_LPTIM45_PCLK3	0x000092C0
+#define CLK_LPTIM45_PLL4P	0x000092C1
+#define CLK_LPTIM45_PLL3Q	0x000092C2
+#define CLK_LPTIM45_LSE		0x000092C3
+#define CLK_LPTIM45_LSI		0x000092C4
+#define CLK_LPTIM45_CKPER	0x000092C5
+#define CLK_LPTIM45_DISABLED	0x000092C7
+
+#define CLK_LPTIM23_PCLK3	0x00009300
+#define CLK_LPTIM23_PLL4Q	0x00009301
+#define CLK_LPTIM23_CKPER	0x00009302
+#define CLK_LPTIM23_LSE		0x00009303
+#define CLK_LPTIM23_LSI		0x00009304
+#define CLK_LPTIM23_DISABLED	0x00009307
+
+#define CLK_LPTIM1_PCLK1	0x00009340
+#define CLK_LPTIM1_PLL4P	0x00009341
+#define CLK_LPTIM1_PLL3Q	0x00009342
+#define CLK_LPTIM1_LSE		0x00009343
+#define CLK_LPTIM1_LSI		0x00009344
+#define CLK_LPTIM1_CKPER	0x00009345
+#define CLK_LPTIM1_DISABLED	0x00009347
+
+/* define for st,pll /csg */
+#define SSCG_MODE_CENTER_SPREAD	0
+#define SSCG_MODE_DOWN_SPREAD	1
+
+/* define for st,drive */
+#define LSEDRV_LOWEST		0
+#define LSEDRV_MEDIUM_LOW	1
+#define LSEDRV_MEDIUM_HIGH	2
+#define LSEDRV_HIGHEST		3
+
+#endif

plat/st/stm32mp1/bl2_plat_setup.c

@@ -16,6 +16,8 @@
 #include <mmio.h>
 #include <platform.h>
 #include <platform_def.h>
+#include <stm32mp1_clk.h>
+#include <stm32mp1_dt.h>
 #include <stm32mp1_private.h>
 #include <stm32mp1_pwr.h>
 #include <stm32mp1_rcc.h>
@@ -76,5 +78,17 @@ void bl2_el3_plat_arch_setup(void)
 
 	generic_delay_timer_init();
 
+	if (dt_open_and_check() < 0) {
+		panic();
+	}
+
+	if (stm32mp1_clk_probe() < 0) {
+		panic();
+	}
+
+	if (stm32mp1_clk_init() < 0) {
+		panic();
+	}
+
 	stm32mp1_io_setup();
 }

plat/st/stm32mp1/include/stm32mp1_dt.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __STM32MP1_DT_H__
+#define __STM32MP1_DT_H__
+
+#include <stdbool.h>
+
+/*******************************************************************************
+ * Function and variable prototypes
+ ******************************************************************************/
+int dt_open_and_check(void);
+int fdt_get_address(void **fdt_addr);
+bool fdt_check_node(int node);
+bool fdt_check_status(int node);
+bool fdt_check_secure_status(int node);
+uint32_t fdt_read_uint32_default(int node, const char *prop_name,
+				 uint32_t dflt_value);
+int fdt_read_uint32_array(int node, const char *prop_name,
+			  uint32_t *array, uint32_t count);
+
+#endif /* __STM32MP1_DT_H__ */

plat/st/stm32mp1/platform.mk

@@ -39,6 +39,10 @@ PLAT_BL_COMMON_SOURCES	+=	lib/cpus/aarch32/cortex_a7.S
 PLAT_BL_COMMON_SOURCES	+=	${LIBFDT_SRCS}						\
 				drivers/delay_timer/delay_timer.c			\
 				drivers/delay_timer/generic_delay_timer.c		\
+				drivers/st/clk/stm32mp1_clk.c				\
+				drivers/st/clk/stm32mp1_clkfunc.c			\
+				drivers/st/reset/stm32mp1_reset.c			\
+				plat/st/stm32mp1/stm32mp1_dt.c				\
 				plat/st/stm32mp1/stm32mp1_helper.S
 
 BL2_SOURCES		+=	drivers/io/io_dummy.c					\

plat/st/stm32mp1/stm32mp1_dt.c

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <debug.h>
+#include <libfdt.h>
+#include <platform_def.h>
+#include <stm32mp1_clk.h>
+#include <stm32mp1_clkfunc.h>
+#include <stm32mp1_dt.h>
+
+#define DT_GPIO_BANK_SHIFT	12
+#define DT_GPIO_BANK_MASK	0x1F000U
+#define DT_GPIO_PIN_SHIFT	8
+#define DT_GPIO_PIN_MASK	0xF00U
+#define DT_GPIO_MODE_MASK	0xFFU
+
+static int fdt_checked;
+
+static void *fdt = (void *)(uintptr_t)STM32MP1_DTB_BASE;
+
+/*******************************************************************************
+ * This function checks device tree file with its header.
+ * Returns 0 if success, and a negative value else.
+ ******************************************************************************/
+int dt_open_and_check(void)
+{
+	int ret = fdt_check_header(fdt);
+
+	if (ret == 0) {
+		fdt_checked = 1;
+	}
+
+	return ret;
+}
+
+/*******************************************************************************
+ * This function gets the address of the DT.
+ * If DT is OK, fdt_addr is filled with DT address.
+ * Returns 1 if success, 0 otherwise.
+ ******************************************************************************/
+int fdt_get_address(void **fdt_addr)
+{
+	if (fdt_checked == 1) {
+		*fdt_addr = fdt;
+	}
+
+	return fdt_checked;
+}
+
+/*******************************************************************************
+ * This function check the presence of a node (generic use of fdt library).
+ * Returns true if present, false else.
+ ******************************************************************************/
+bool fdt_check_node(int node)
+{
+	int len;
+	const char *cchar;
+
+	cchar = fdt_get_name(fdt, node, &len);
+
+	return (cchar != NULL) && (len >= 0);
+}
+
+/*******************************************************************************
+ * This function check the status of a node (generic use of fdt library).
+ * Returns true if "okay" or missing, false else.
+ ******************************************************************************/
+bool fdt_check_status(int node)
+{
+	int len;
+	const char *cchar;
+
+	cchar = fdt_getprop(fdt, node, "status", &len);
+	if (cchar == NULL) {
+		return true;
+	}
+
+	return strncmp(cchar, "okay", (size_t)len) == 0;
+}
+
+/*******************************************************************************
+ * This function check the secure-status of a node (generic use of fdt library).
+ * Returns true if "okay" or missing, false else.
+ ******************************************************************************/
+bool fdt_check_secure_status(int node)
+{
+	int len;
+	const char *cchar;
+
+	cchar = fdt_getprop(fdt, node, "secure-status", &len);
+	if (cchar == NULL) {
+		return true;
+	}
+
+	return strncmp(cchar, "okay", (size_t)len) == 0;
+}
+
+/*******************************************************************************
+ * This function reads a value of a node property (generic use of fdt
+ * library).
+ * Returns value if success, and a default value if property not found.
+ * Default value is passed as parameter.
+ ******************************************************************************/
+uint32_t fdt_read_uint32_default(int node, const char *prop_name,
+				 uint32_t dflt_value)
+{
+	const fdt32_t *cuint;
+	int lenp;
+
+	cuint = fdt_getprop(fdt, node, prop_name, &lenp);
+	if (cuint == NULL) {
+		return dflt_value;
+	}
+
+	return fdt32_to_cpu(*cuint);
+}
+
+/*******************************************************************************
+ * This function reads a series of parameters in a node property
+ * (generic use of fdt library).
+ * It reads the values inside the device tree, from property name and node.
+ * The number of parameters is also indicated as entry parameter.
+ * Returns 0 if success, and a negative value else.
+ * If success, values are stored at the third parameter address.
+ ******************************************************************************/
+int fdt_read_uint32_array(int node, const char *prop_name, uint32_t *array,
+			  uint32_t count)
+{
+	const fdt32_t *cuint;
+	int len;
+	uint32_t i;
+
+	cuint = fdt_getprop(fdt, node, prop_name, &len);
+	if (cuint == NULL) {
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	if ((uint32_t)len != (count * sizeof(uint32_t))) {
+		return -FDT_ERR_BADLAYOUT;
+	}
+
+	for (i = 0; i < ((uint32_t)len / sizeof(uint32_t)); i++) {
+		*array = fdt32_to_cpu(*cuint);
+		array++;
+		cuint++;
+	}
+
+	return 0;
+}