blob: 19dfe1b25417df5f9146157851edf2dcbd0d3819 [file] [log] [blame]
/*
* Copyright (c) 2017-2019, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <errno.h>
#include <libfdt.h>
#include <platform_def.h>
#include <drivers/st/stm32mp1_clk.h>
#include <drivers/st/stm32mp1_clkfunc.h>
#include <dt-bindings/clock/stm32mp1-clksrc.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 returns the RCC node in the device tree.
******************************************************************************/
static int fdt_get_rcc_node(void *fdt)
{
return fdt_node_offset_by_compatible(fdt, -1, DT_RCC_CLK_COMPAT);
}
/*******************************************************************************
* This function reads the frequency of an oscillator from its name.
* It reads the value indicated inside the device tree.
* Returns 0 on success, and a negative FDT/ERRNO error code on failure.
* On 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 on 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 on success, and a negative FDT/ERRNO error code on failure.
******************************************************************************/
int fdt_rcc_subnode_offset(const char *name)
{
int node, subnode;
void *fdt;
if (fdt_get_address(&fdt) == 0) {
return -ENOENT;
}
node = fdt_get_rcc_node(fdt);
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 on success, and NULL value on failure.
******************************************************************************/
const fdt32_t *fdt_rcc_read_prop(const char *prop_name, int *lenp)
{
const fdt32_t *cuint;
int node, len;
void *fdt;
if (fdt_get_address(&fdt) == 0) {
return NULL;
}
node = fdt_get_rcc_node(fdt);
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 true if rcc is available from secure world, false if not.
******************************************************************************/
bool fdt_get_rcc_secure_status(void)
{
int node;
void *fdt;
if (fdt_get_address(&fdt) == 0) {
return false;
}
node = fdt_get_rcc_node(fdt);
if (node < 0) {
return false;
}
return (fdt_get_status(node) & DT_SECURE) != 0U;
}
/*******************************************************************************
* This function reads the stgen base address.
* It reads the value indicated inside the device tree.
* Returns address on success, and NULL value on failure.
******************************************************************************/
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 on success, and a negative FDT/ERRNO error code on failure.
******************************************************************************/
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);
}