mx35: Fix clock dividers

The clock dividers that were used do not match at all the reference manual. They
were either completely broken, or came from an early silicon revision
incompatible with the current one.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>

1 files changed, 18 insertions, 30 deletions

diff --git a/arch/arm/cpu/arm1136/mx35/generic.c b/arch/arm/cpu/arm1136/mx35/generic.c
index de7503c015..e4b07d0744 100644
--- a/arch/arm/cpu/arm1136/mx35/generic.c
+++ b/arch/arm/cpu/arm1136/mx35/generic.c
@@ -174,17 +174,14 @@ static u32 get_ipg_per_clk(void)
 	u32 pdr4 = readl(&ccm->pdr4);
 	u32 div;
 	if (pdr0 & MXC_CCM_PDR0_PER_SEL) {
-		div = (CCM_GET_DIVIDER(pdr4,
-			MXC_CCM_PDR4_PER0_PRDF_MASK,
-			MXC_CCM_PDR4_PER0_PODF_OFFSET) + 1) *
-			(CCM_GET_DIVIDER(pdr4,
+		div = CCM_GET_DIVIDER(pdr4,
 			MXC_CCM_PDR4_PER0_PODF_MASK,
-			MXC_CCM_PDR4_PER0_PODF_OFFSET) + 1);
+			MXC_CCM_PDR4_PER0_PODF_OFFSET) + 1;
 	} else {
 		div = CCM_GET_DIVIDER(pdr0,
 			MXC_CCM_PDR0_PER_PODF_MASK,
 			MXC_CCM_PDR0_PER_PODF_OFFSET) + 1;
-		freq /= get_ahb_div(pdr0);
+		div *= get_ahb_div(pdr0);
 	}
 	return freq / div;
 }
@@ -202,19 +199,16 @@ u32 imx_get_uartclk(void)
 		freq = decode_pll(readl(&ccm->ppctl),
 			CONFIG_MX35_HCLK_FREQ);
 	}
-	freq /= ((CCM_GET_DIVIDER(pdr4,
-			MXC_CCM_PDR4_UART_PRDF_MASK,
-			MXC_CCM_PDR4_UART_PRDF_OFFSET) + 1) *
-		(CCM_GET_DIVIDER(pdr4,
+	freq /= CCM_GET_DIVIDER(pdr4,
 			MXC_CCM_PDR4_UART_PODF_MASK,
-			MXC_CCM_PDR4_UART_PODF_OFFSET) + 1));
+			MXC_CCM_PDR4_UART_PODF_OFFSET) + 1;
 	return freq;
 }
 
 unsigned int mxc_get_main_clock(enum mxc_main_clock clk)
 {
 	u32 nfc_pdf, hsp_podf;
-	u32 pll, ret_val = 0, usb_prdf, usb_podf;
+	u32 pll, ret_val = 0, usb_podf;
 	struct ccm_regs *ccm =
 		(struct ccm_regs *)IMX_CCM_BASE;
 
@@ -258,8 +252,7 @@ unsigned int mxc_get_main_clock(enum mxc_main_clock clk)
 		ret_val = pll / (nfc_pdf + 1);
 		break;
 	case USB_CLK:
-		usb_prdf = (reg4 >> 25) & 0x7;
-		usb_podf = (reg4 >> 22) & 0x7;
+		usb_podf = (reg4 >> 22) & 0x3F;
 		if (reg4 & 0x200) {
 			pll = get_mcu_main_clk();
 		} else {
@@ -267,7 +260,7 @@ unsigned int mxc_get_main_clock(enum mxc_main_clock clk)
 				CONFIG_MX35_HCLK_FREQ);
 		}
 
-		ret_val = pll / ((usb_prdf + 1) * (usb_podf + 1));
+		ret_val = pll / (usb_podf + 1);
 		break;
 	default:
 		printf("Unknown clock: %d\n", clk);
@@ -290,11 +283,10 @@ unsigned int mxc_get_peri_clock(enum mxc_peri_clock clk)
 	case UART2_BAUD:
 	case UART3_BAUD:
 		clk_sel = mpdr3 & (1 << 14);
-		pre_pdf = (mpdr4 >> 13) & 0x7;
-		pdf = (mpdr4 >> 10) & 0x7;
+		pdf = (mpdr4 >> 10) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) /
-				((pre_pdf + 1) * (pdf + 1));
+				(pdf + 1);
 		break;
 	case SSI1_BAUD:
 		pre_pdf = (mpdr2 >> 24) & 0x7;
@@ -314,11 +306,10 @@ unsigned int mxc_get_peri_clock(enum mxc_peri_clock clk)
 		break;
 	case CSI_BAUD:
 		clk_sel = mpdr2 & (1 << 7);
-		pre_pdf = (mpdr2 >> 16) & 0x7;
-		pdf = (mpdr2 >> 19) & 0x7;
+		pdf = (mpdr2 >> 16) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) /
-				((pre_pdf + 1) * (pdf + 1));
+				(pdf + 1);
 		break;
 	case MSHC_CLK:
 		pre_pdf = readl(&ccm->pdr1);
@@ -331,27 +322,24 @@ unsigned int mxc_get_peri_clock(enum mxc_peri_clock clk)
 		break;
 	case ESDHC1_CLK:
 		clk_sel = mpdr3 & 0x40;
-		pre_pdf = mpdr3 & 0x7;
-		pdf = (mpdr3>>3) & 0x7;
+		pdf = mpdr3 & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) /
-				((pre_pdf + 1) * (pdf + 1));
+				(pdf + 1);
 		break;
 	case ESDHC2_CLK:
 		clk_sel = mpdr3 & 0x40;
-		pre_pdf = (mpdr3 >> 8) & 0x7;
-		pdf = (mpdr3 >> 11) & 0x7;
+		pdf = (mpdr3 >> 8) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) /
-				((pre_pdf + 1) * (pdf + 1));
+				(pdf + 1);
 		break;
 	case ESDHC3_CLK:
 		clk_sel = mpdr3 & 0x40;
-		pre_pdf = (mpdr3 >> 16) & 0x7;
-		pdf = (mpdr3 >> 19) & 0x7;
+		pdf = (mpdr3 >> 16) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) /
-				((pre_pdf + 1) * (pdf + 1));
+				(pdf + 1);
 		break;
 	case SPDIF_CLK:
 		clk_sel = mpdr3 & 0x400000;