[U-Boot] [PATCH 18/18] mxs: Fix the memory init for MX23

[Marek Vasut]

From: Otavio Salvador <otavio at ossystems.com.br>

The memory init is slightly different on MX23, thus split the memory
init for mx23 and mx28 into different functions.

Signed-off-by: Marek Vasut <marex at denx.de>
Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>
Cc: Fabio Estevam <fabio.estevam at freescale.com>
Cc: Stefano Babic <sbabic at denx.de>
---
 arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c |   93 ++++++++++++++++++++++++-----
 1 file changed, 78 insertions(+), 15 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
index 9d05f83..5944dd2 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
@@ -128,13 +128,20 @@ static void mxs_mem_init_clock(void)
 {
 	struct mxs_clkctrl_regs *clkctrl_regs =
 		(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
+#if defined(CONFIG_MX23)
+	/* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
+	const unsigned char divider = 33;
+#elif defined(CONFIG_MX28)
+	/* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
+	const unsigned char divider = 21;
+#endif
 
 	/* Gate EMI clock */
 	writeb(CLKCTRL_FRAC_CLKGATE,
 		&clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
 
-	/* Set fractional divider for ref_emi to 480 * 18 / 21 = 411MHz */
-	writeb(CLKCTRL_FRAC_CLKGATE | (21 & CLKCTRL_FRAC_FRAC_MASK),
+	/* Set fractional divider for ref_emi */
+	writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
 		&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
 
 	/* Ungate EMI clock */
@@ -217,10 +224,60 @@ uint32_t mxs_mem_get_size(void)
 	return sz;
 }
 
-void mxs_mem_init(void)
+#ifdef CONFIG_MX23
+static void mx23_mem_setup_vddmem(void)
+{
+	struct mxs_power_regs *power_regs =
+		(struct mxs_power_regs *)MXS_POWER_BASE;
+
+	writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) |
+		POWER_VDDMEMCTRL_ENABLE_ILIMIT |
+		POWER_VDDMEMCTRL_ENABLE_LINREG |
+		POWER_VDDMEMCTRL_PULLDOWN_ACTIVE,
+		&power_regs->hw_power_vddmemctrl);
+
+	early_delay(10000);
+
+	writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) |
+		POWER_VDDMEMCTRL_ENABLE_LINREG,
+		&power_regs->hw_power_vddmemctrl);
+}
+
+static void mx23_mem_init(void)
+{
+	mx23_mem_setup_vddmem();
+
+	/*
+	 * Configure the DRAM registers
+	 */
+
+	/* Clear START and SREFRESH bit from DRAM_CTL8 */
+	clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8));
+
+	initialize_dram_values();
+
+	/* Set START bit in DRAM_CTL16 */
+	setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
+
+	clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
+	early_delay(20000);
+
+	/* Adjust EMI port priority. */
+	clrsetbits_le32(0x80020000, 0x1f << 16, 0x8);
+	early_delay(20000);
+
+	setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
+	setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
+
+	/* Wait for bit 10 (DRAM init complete) in DRAM_CTL18 */
+	while (!(readl(MXS_DRAM_BASE + 0x48) & (1 << 10)))
+		;
+}
+#endif
+
+#ifdef CONFIG_MX28
+static void mx28_mem_init(void)
 {
-	struct mxs_clkctrl_regs *clkctrl_regs =
-		(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
 	struct mxs_pinctrl_regs *pinctrl_regs =
 		(struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
 
@@ -228,16 +285,6 @@ void mxs_mem_init(void)
 	writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
 		&pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
 
-	/* Power up PLL0 */
-	writel(CLKCTRL_PLL0CTRL0_POWER,
-		&clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
-
-	early_delay(11000);
-
-	mxs_mem_init_clock();
-
-	mxs_mem_setup_vdda();
-
 	/*
 	 * Configure the DRAM registers
 	 */
@@ -256,6 +303,22 @@ void mxs_mem_init(void)
 	/* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
 	while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
 		;
+}
+#endif
+
+void mxs_mem_init(void)
+{
+	early_delay(11000);
+
+	mxs_mem_init_clock();
+
+	mxs_mem_setup_vdda();
+
+#if defined(CONFIG_MX23)
+	mx23_mem_init();
+#elif defined(CONFIG_MX28)
+	mx28_mem_init();
+#endif
 
 	early_delay(10000);
 
-- 
1.7.10.4