ENGR00325255 pcie:enable pcie support on imx6sx sd

Enable pcie support in uboot on imx6sx sd boards
- enable_pcie_clock should be call before ssp_en is set,
  since that ssp_en control the phy_ref clk gate, turn on
  it after the source of the pcie clks are stable.
- add debug info
- add rx_eq of gpr12 on imx6sx
- there are random link down issue on imx6sx. It's
  pcie ep reset issue.
  solution:reset ep, then retry link can fix it.

(cherry picked from commit ec78595a24b5ff1020baa97b6d6e79a3a3326307)
Signed-off-by: Richard Zhu <r65037@freescale.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 81fd30250110d72992758f08b66c07306126892b)

3 files changed, 35 insertions, 5 deletions

diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
index 51e5211..a334f49 100644
--- a/arch/arm/cpu/armv7/mx6/clock.c
+++ b/arch/arm/cpu/armv7/mx6/clock.c
@@ -1166,6 +1166,15 @@ void disable_sata_clock(void)
 #endif
 
 #ifdef CONFIG_PCIE_IMX
+static void ungate_disp_axi_clock(void)
+{
+	struct mxc_ccm_reg *const imx_ccm =
+		(struct mxc_ccm_reg *)CCM_BASE_ADDR;
+
+	/* Enable display axi clock. */
+	setbits_le32(&imx_ccm->CCGR3, MXC_CCM_CCGR3_DISP_AXI_MASK);
+}
+
 static void ungate_pcie_clock(void)
 {
 	struct mxc_ccm_reg *const imx_ccm =
@@ -1213,14 +1222,22 @@ int enable_pcie_clock(void)
 	/* PCIe reference clock sourced from AXI. */
 	clrbits_le32(&ccm_regs->cbcmr, MXC_CCM_CBCMR_PCIE_AXI_CLK_SEL);
 
-	/* Party time! Ungate the clock to the PCIe. */
+	if (!is_cpu_type(MXC_CPU_MX6SX)) {
+		/* Party time! Ungate the clock to the PCIe. */
 #ifdef CONFIG_CMD_SATA
-	ungate_sata_clock();
+		ungate_sata_clock();
 #endif
-	ungate_pcie_clock();
+		ungate_pcie_clock();
 
-	return enable_enet_pll(BM_ANADIG_PLL_ENET_ENABLE_SATA |
-			       BM_ANADIG_PLL_ENET_ENABLE_PCIE);
+		return enable_enet_pll(BM_ANADIG_PLL_ENET_ENABLE_SATA |
+				       BM_ANADIG_PLL_ENET_ENABLE_PCIE);
+	} else {
+		/* Party time! Ungate the clock to the PCIe. */
+		ungate_disp_axi_clock();
+		ungate_pcie_clock();
+
+		return enable_enet_pll(BM_ANADIG_PLL_ENET_ENABLE_PCIE);
+	}
 }
 #endif
 
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index 5e77d29..0a97f0d 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -406,6 +406,16 @@ void vadc_power_down(void)
 	val &= ~IMX6SX_GPR5_CSI1_MUX_CTRL_MASK,
 	writel(val, &iomux->gpr[5]);
 }
+
+void pcie_power_up(void)
+{
+	set_ldo_voltage(LDO_PU, 1100);	/* Set VDDPU to 1.1V */
+}
+
+void pcie_power_off(void)
+{
+	set_ldo_voltage(LDO_PU, 0);	/* Set VDDPU to 1.1V */
+}
 #endif
 
 static void set_uart_from_osc(void)
diff --git a/arch/arm/include/asm/imx-common/sys_proto.h b/arch/arm/include/asm/imx-common/sys_proto.h
index 3a58a25..660240a 100644
--- a/arch/arm/include/asm/imx-common/sys_proto.h
+++ b/arch/arm/include/asm/imx-common/sys_proto.h
@@ -72,4 +72,7 @@ void board_late_mmc_env_init(void);
 
 void vadc_power_up(void);
 void vadc_power_down(void);
+
+void pcie_power_up(void);
+void pcie_power_off(void);
 #endif