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-rw-r--r--arch/arm/include/asm/arch-imx9/sys_proto.h11
-rw-r--r--arch/arm/mach-imx/imx9/clock.c31
-rw-r--r--arch/arm/mach-imx/imx9/soc.c107
-rw-r--r--board/freescale/imx93_evk/spl.c2
4 files changed, 143 insertions, 8 deletions
diff --git a/arch/arm/include/asm/arch-imx9/sys_proto.h b/arch/arm/include/asm/arch-imx9/sys_proto.h
index 2f7a1292758..e4bf6a63424 100644
--- a/arch/arm/include/asm/arch-imx9/sys_proto.h
+++ b/arch/arm/include/asm/arch-imx9/sys_proto.h
@@ -8,7 +8,18 @@
#include <asm/mach-imx/sys_proto.h>
+enum imx9_soc_voltage_mode {
+ VOLT_LOW_DRIVE = 0,
+ VOLT_NOMINAL_DRIVE,
+ VOLT_OVER_DRIVE,
+};
+
void soc_power_init(void);
bool m33_is_rom_kicked(void);
int m33_prepare(void);
+
+enum imx9_soc_voltage_mode soc_target_voltage_mode(void);
+
+#define is_voltage_mode(mode) (soc_target_voltage_mode() == (mode))
+
#endif
diff --git a/arch/arm/mach-imx/imx9/clock.c b/arch/arm/mach-imx/imx9/clock.c
index 0abf4579a1e..1433e68874d 100644
--- a/arch/arm/mach-imx/imx9/clock.c
+++ b/arch/arm/mach-imx/imx9/clock.c
@@ -603,7 +603,7 @@ void init_clk_usdhc(u32 index)
{
u32 div;
- if (IS_ENABLED(CONFIG_IMX9_LOW_DRIVE_MODE))
+ if (is_voltage_mode(VOLT_LOW_DRIVE))
div = 3; /* 266.67 Mhz */
else
div = 2; /* 400 Mhz */
@@ -700,8 +700,7 @@ void set_arm_core_max_clk(void)
#endif
-#if IS_ENABLED(CONFIG_IMX9_LOW_DRIVE_MODE)
-struct imx_clk_setting imx_clk_settings[] = {
+struct imx_clk_setting imx_clk_ld_settings[] = {
/* Set A55 clk to 500M */
{ARM_A55_CLK_ROOT, SYS_PLL_PFD0, 2},
/* Set A55 periphal to 200M */
@@ -728,7 +727,7 @@ struct imx_clk_setting imx_clk_settings[] = {
/* NIC_APB to 133M */
{NIC_APB_CLK_ROOT, SYS_PLL_PFD1_DIV2, 3}
};
-#else
+
struct imx_clk_setting imx_clk_settings[] = {
/*
* Set A55 clk to 500M. This clock root is normally used as intermediate
@@ -762,9 +761,18 @@ struct imx_clk_setting imx_clk_settings[] = {
/* NIC_APB to 133M */
{NIC_APB_CLK_ROOT, SYS_PLL_PFD1_DIV2, 3}
};
-#endif
-int clock_init(void)
+void bus_clock_init_low_drive(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(imx_clk_ld_settings); i++) {
+ ccm_clk_root_cfg(imx_clk_ld_settings[i].clk_root,
+ imx_clk_ld_settings[i].src, imx_clk_ld_settings[i].div);
+ }
+}
+
+void bus_clock_init(void)
{
int i;
@@ -772,9 +780,18 @@ int clock_init(void)
ccm_clk_root_cfg(imx_clk_settings[i].clk_root,
imx_clk_settings[i].src, imx_clk_settings[i].div);
}
+}
- if (IS_ENABLED(CONFIG_IMX9_LOW_DRIVE_MODE))
+int clock_init(void)
+{
+ int i;
+
+ if (is_voltage_mode(VOLT_LOW_DRIVE)) {
+ bus_clock_init_low_drive();
set_arm_clk(MHZ(900));
+ } else {
+ bus_clock_init();
+ }
/* allow for non-secure access */
for (i = 0; i < OSCPLL_END; i++)
diff --git a/arch/arm/mach-imx/imx9/soc.c b/arch/arm/mach-imx/imx9/soc.c
index ba04abff262..52aafcbf99c 100644
--- a/arch/arm/mach-imx/imx9/soc.c
+++ b/arch/arm/mach-imx/imx9/soc.c
@@ -615,11 +615,99 @@ int arch_misc_init(void)
return 0;
}
+struct low_drive_freq_entry {
+ const char *node_path;
+ u32 clk;
+ u32 new_rate;
+};
+
+static int low_drive_fdt_fix_clock(void *fdt, int node_off, u32 clk_index, u32 new_rate)
+{
+#define MAX_ASSIGNED_CLKS 8
+ int cnt, j;
+ u32 assignedclks[MAX_ASSIGNED_CLKS]; /* max 8 clocks*/
+
+ cnt = fdtdec_get_int_array_count(fdt, node_off, "assigned-clock-rates",
+ assignedclks, MAX_ASSIGNED_CLKS);
+ if (cnt > 0) {
+ if (cnt <= clk_index)
+ return -ENOENT;
+
+ if (assignedclks[clk_index] <= new_rate)
+ return 0;
+
+ assignedclks[clk_index] = new_rate;
+ for (j = 0; j < cnt; j++)
+ assignedclks[j] = cpu_to_fdt32(assignedclks[j]);
+
+ return fdt_setprop(fdt, node_off, "assigned-clock-rates", &assignedclks,
+ cnt * sizeof(u32));
+ }
+
+ return -ENOENT;
+}
+
+static int low_drive_freq_update(void *blob)
+{
+ int nodeoff, ret;
+ int i;
+
+ /* Update kernel dtb clocks for low drive mode */
+ struct low_drive_freq_entry table[] = {
+ {"/soc@0/bus@42800000/mmc@42850000", 0, 266666667},
+ {"/soc@0/bus@42800000/mmc@42860000", 0, 266666667},
+ {"/soc@0/bus@42800000/mmc@428b0000", 0, 266666667},
+ };
+
+ for (i = 0; i < ARRAY_SIZE(table); i++) {
+ nodeoff = fdt_path_offset(blob, table[i].node_path);
+ if (nodeoff >= 0) {
+ ret = low_drive_fdt_fix_clock(blob, nodeoff, table[i].clk,
+ table[i].new_rate);
+ if (!ret)
+ printf("%s freq updated\n", table[i].node_path);
+ }
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_OF_BOARD_FIXUP
+#ifndef CONFIG_SPL_BUILD
+int board_fix_fdt(void *fdt)
+{
+ /* Update dtb clocks for low drive mode */
+ if (is_voltage_mode(VOLT_LOW_DRIVE)) {
+ int nodeoff;
+ int i;
+
+ struct low_drive_freq_entry table[] = {
+ {"/soc@0/bus@42800000/mmc@42850000", 0, 266666667},
+ {"/soc@0/bus@42800000/mmc@42860000", 0, 266666667},
+ {"/soc@0/bus@42800000/mmc@428b0000", 0, 266666667},
+ };
+
+ for (i = 0; i < ARRAY_SIZE(table); i++) {
+ nodeoff = fdt_path_offset(fdt, table[i].node_path);
+ if (nodeoff >= 0)
+ low_drive_fdt_fix_clock(fdt, nodeoff, table[i].clk,
+ table[i].new_rate);
+ }
+ }
+
+ return 0;
+}
+#endif
+#endif
+
int ft_system_setup(void *blob, struct bd_info *bd)
{
if (fixup_thermal_trips(blob, "cpu-thermal"))
printf("Failed to update cpu-thermal trip(s)");
+ if (is_voltage_mode(VOLT_LOW_DRIVE))
+ low_drive_freq_update(blob);
+
return 0;
}
@@ -943,3 +1031,22 @@ int psci_sysreset_get_status(struct udevice *dev, char *buf, int size)
return 0;
}
+
+enum imx9_soc_voltage_mode soc_target_voltage_mode(void)
+{
+ u32 speed = get_cpu_speed_grade_hz();
+ enum imx9_soc_voltage_mode voltage = VOLT_OVER_DRIVE;
+
+ if (is_imx93()) {
+ if (speed == 1700000000)
+ voltage = VOLT_OVER_DRIVE;
+ else if (speed == 1400000000)
+ voltage = VOLT_NOMINAL_DRIVE;
+ else if (speed == 900000000 || speed == 800000000)
+ voltage = VOLT_LOW_DRIVE;
+ else
+ printf("Unexpected A55 freq %u, default to OD\n", speed);
+ }
+
+ return voltage;
+}
diff --git a/board/freescale/imx93_evk/spl.c b/board/freescale/imx93_evk/spl.c
index e5807134bb2..e4999baa95f 100644
--- a/board/freescale/imx93_evk/spl.c
+++ b/board/freescale/imx93_evk/spl.c
@@ -77,7 +77,7 @@ int power_init_board(void)
/* enable DVS control through PMIC_STBY_REQ */
pmic_reg_write(dev, PCA9450_BUCK1CTRL, 0x59);
- if (IS_ENABLED(CONFIG_IMX9_LOW_DRIVE_MODE)) {
+ if (is_voltage_mode(VOLT_LOW_DRIVE))
/* 0.75v for Low drive mode
*/
pmic_reg_write(dev, PCA9450_BUCK1OUT_DVS0, 0x0c);
generated by cgit v1.3.1 (git 2.54.0) at 2026-07-29 05:39:08 +0000