For now, the clock dividers are only accessible from mx28_mem_init, and
the old prescaler of 2 is hardcoded in mx23_mem_init. I'm not sure
if it makes sense to change it at all.
Signed-off-by: Roland Hieber <r.hieber@xxxxxxxxxxxxxx>
---
arch/arm/boards/duckbill/lowlevel.c | 2 ++
arch/arm/boards/freescale-mx28-evk/lowlevel.c | 2 ++
arch/arm/boards/karo-tx28/lowlevel.c | 2 ++
arch/arm/mach-mxs/include/mach/init.h | 6 +++---
arch/arm/mach-mxs/mem-init.c | 16 ++++++++--------
5 files changed, 17 insertions(+), 11 deletions(-)
diff --git a/arch/arm/boards/duckbill/lowlevel.c b/arch/arm/boards/duckbill/lowlevel.c
index 3adda68d77..393d4e1e12 100644
--- a/arch/arm/boards/duckbill/lowlevel.c
+++ b/arch/arm/boards/duckbill/lowlevel.c
@@ -56,6 +56,8 @@ static noinline void duckbill_init(void)
pr_debug("initializing SDRAM...\n");
mx28_mem_init(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
+ /* EMI_CLK of 480 / 2 * (18/21) = 205.7 MHz */
+ 2, 21,
mx28_dram_vals_default);
pr_debug("DONE\n");
diff --git a/arch/arm/boards/freescale-mx28-evk/lowlevel.c b/arch/arm/boards/freescale-mx28-evk/lowlevel.c
index 9df60210e6..196efe0346 100644
--- a/arch/arm/boards/freescale-mx28-evk/lowlevel.c
+++ b/arch/arm/boards/freescale-mx28-evk/lowlevel.c
@@ -48,6 +48,8 @@ static noinline void freescale_mx28evk_init(void)
pr_debug("initializing SDRAM...\n");
mx28_mem_init(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
+ /* EMI_CLK of 480 / 2 * (18/21) = 205.7 MHz */
+ 2, 21,
mx28_dram_vals_default);
pr_debug("DONE\n");
diff --git a/arch/arm/boards/karo-tx28/lowlevel.c b/arch/arm/boards/karo-tx28/lowlevel.c
index 99f8a562cc..c01c760109 100644
--- a/arch/arm/boards/karo-tx28/lowlevel.c
+++ b/arch/arm/boards/karo-tx28/lowlevel.c
@@ -48,6 +48,8 @@ static noinline void karo_tx28_init(void)
pr_debug("initializing SDRAM...\n");
mx28_mem_init(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
+ /* EMI_CLK of 480 / 2 * (18/21) = 205.7 MHz */
+ 2, 21,
mx28_dram_vals_default);
pr_debug("DONE\n");
diff --git a/arch/arm/mach-mxs/include/mach/init.h b/arch/arm/mach-mxs/include/mach/init.h
index 7021981d41..4b826363f1 100644
--- a/arch/arm/mach-mxs/include/mach/init.h
+++ b/arch/arm/mach-mxs/include/mach/init.h
@@ -26,11 +26,11 @@ extern uint32_t mx23_dram_vals[];
#define PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2 (0b11 << 16)
void mx23_mem_init(void);
-void mx28_mem_init(const int emi_ds_ctrl_ddr_mode,
- const uint32_t dram_vals[190]);
+void mx28_mem_init(const int emi_ds_ctrl_ddr_mode, const uint8_t clk_emi_div,
+ const uint8_t clk_emi_frac_div, const uint32_t dram_vals[190]);
void mxs_mem_setup_cpu_and_hbus(void);
void mxs_mem_setup_vdda(void);
-void mxs_mem_init_clock(unsigned char divider);
+void mxs_mem_init_clock(const uint8_t clk_emi_div, const uint8_t clk_emi_frac);
void mxs_lradc_init(void);
void mxs_lradc_enable_batt_measurement(void);
diff --git a/arch/arm/mach-mxs/mem-init.c b/arch/arm/mach-mxs/mem-init.c
index 7bc6be00b4..585c3173f5 100644
--- a/arch/arm/mach-mxs/mem-init.c
+++ b/arch/arm/mach-mxs/mem-init.c
@@ -192,7 +192,7 @@ static void mx23_initialize_dram_values(void)
writel((1 << 24), IMX_SDRAMC_BASE + (4 * 8));
}
-void mxs_mem_init_clock(unsigned char divider)
+void mxs_mem_init_clock(const uint8_t clk_emi_div, const uint8_t clk_emi_frac)
{
struct mxs_clkctrl_regs *clkctrl_regs =
(struct mxs_clkctrl_regs *)IMX_CCM_BASE;
@@ -202,7 +202,7 @@ void mxs_mem_init_clock(unsigned char divider)
&clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
/* Set fractional divider for ref_emi */
- writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
+ writeb(CLKCTRL_FRAC_CLKGATE | (clk_emi_frac & CLKCTRL_FRAC_FRAC_MASK),
&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
/* Ungate EMI clock */
@@ -211,8 +211,8 @@ void mxs_mem_init_clock(unsigned char divider)
mxs_early_delay(11000);
- /* Set EMI clock divider for EMI clock to 411 / 2 = 205MHz */
- writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
+ /* Set EMI clock divider for EMI clock */
+ writel(((clk_emi_div & CLKCTRL_EMI_DIV_EMI_MASK) << CLKCTRL_EMI_DIV_EMI_OFFSET) |
(1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
&clkctrl_regs->hw_clkctrl_emi);
@@ -274,7 +274,7 @@ void mx23_mem_init(void)
mxs_early_delay(11000);
/* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
- mxs_mem_init_clock(33);
+ mxs_mem_init_clock(2, 33);
/*
* Reset/ungate the EMI block. This is essential, otherwise the system
@@ -318,12 +318,12 @@ void mx23_mem_init(void)
mxs_mem_setup_cpu_and_hbus();
}
-void mx28_mem_init(const int emi_ds_ctrl_ddr_mode, const uint32_t dram_vals[190])
+void mx28_mem_init(const int emi_ds_ctrl_ddr_mode, const uint8_t clk_emi_div,
+ const uint8_t clk_emi_frac_div, const uint32_t dram_vals[190])
{
mxs_early_delay(11000);
- /* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
- mxs_mem_init_clock(21);
+ mxs_mem_init_clock(clk_emi_div, clk_emi_frac_div);
/* Set DDR mode */
writel(emi_ds_ctrl_ddr_mode, IMX_IOMUXC_BASE + 0x1b80);
--
2.18.0
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