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>
diff --git a/drivers/st/clk/stm32mp1_clkfunc.c b/drivers/st/clk/stm32mp1_clkfunc.c
new file mode 100644
index 0000000..d4c69cb
--- /dev/null
+++ b/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);
+}