ENGR00214799 MX6 PCIe enable the GEN2 mode

* enable PCIe on ARD boards
* Configure the DEEM parameters to pass PCIe GEN2 stress tests
Signed-off-by: Richard Zhu <Hong-Xing.Zhu@freescale.com>

arch/arm/mach-mx6/Kconfig

@@ -200,6 +200,7 @@ config MACH_MX6Q_SABREAUTO
 	select IMX_HAVE_PLATFORM_IMX_MIPI_DSI
 	select IMX_HAVE_PLATFORM_FLEXCAN
 	select IMX_HAVE_PLATFORM_IMX_MIPI_CSI2
+	select IMX_HAVE_PLATFORM_IMX_PCIE
 	help
 	  Include support for i.MX 6Quad SABRE Auto platform. This includes specific
 	  configurations for the board and its peripherals.

arch/arm/mach-mx6/board-mx6q_arm2.c

@@ -2168,6 +2168,7 @@ static void __init mx6_arm2_init(void)
 		mxc_register_device(&max17135_sensor_device, NULL);
 		imx6dl_add_imx_epdc(&epdc_data);
 	}
+	/* Add PCIe RC interface support */
 	imx6q_add_pcie(&mx6_arm2_pcie_data);
 	imx6q_add_busfreq();
 }

arch/arm/mach-mx6/board-mx6q_sabreauto.c

@@ -120,6 +120,7 @@
 #define SABREAUTO_IO_EXP_GPIO2(x)	(SABREAUTO_MAX7310_2_BASE_ADDR + (x))
 #define SABREAUTO_IO_EXP_GPIO3(x)	(SABREAUTO_MAX7310_3_BASE_ADDR + (x))
 
+#define SABREAUTO_PCIE_RST_B_REVB	(SABREAUTO_MAX7310_1_BASE_ADDR + 2)
 /*
  * CAN2 STBY and EN lines are the same as the CAN1. These lines are not
  * independent.
@@ -1297,6 +1298,12 @@ static struct fsl_mxc_capture_platform_data capture_data[] = {
 	},
 };
 
+static const struct imx_pcie_platform_data mx6_sabreauto_pcie_data __initconst = {
+	.pcie_pwr_en	= -EINVAL,
+	.pcie_rst	= SABREAUTO_PCIE_RST_B_REVB,
+	.pcie_wake_up	= -EINVAL,
+	.pcie_dis	= -EINVAL,
+};
 
 /*!
  * Board specific initialization.
@@ -1570,6 +1577,9 @@ static void __init mx6_board_init(void)
 	mxc_register_device(&mxc_si4763_audio_device, &si4763_audio_data);
 
 	imx6q_add_busfreq();
+
+	/* Add PCIe RC interface support */
+	imx6q_add_pcie(&mx6_sabreauto_pcie_data);
 }
 
 extern void __iomem *twd_base;

arch/arm/mach-mx6/board-mx6q_sabresd.c

@@ -1797,6 +1797,7 @@ static void __init mx6_sabresd_board_init(void)
 	pm_power_off = mx6_snvs_poweroff;
 	imx6q_add_busfreq();
 
+	/* Add PCIe RC interface support */
 	imx6q_add_pcie(&mx6_sabresd_pcie_data);
 	if (cpu_is_mx6dl()) {
 		mxc_iomux_v3_setup_multiple_pads(mx6dl_arm2_elan_pads,

arch/arm/mach-mx6/crm_regs.h

@@ -121,6 +121,7 @@
 #define ANADIG_PLL_ENET_POWER_DOWN		(1 << 12)
 #define ANADIG_PLL_ENET_DIV_SELECT_MASK		(0x3)
 #define ANADIG_PLL_ENET_DIV_SELECT_OFFSET	(0)
+#define ANATOP_BYPASS_SRC_LVDS1         0x00004000
 
 /* PFD register defines. */
 #define ANADIG_PFD_FRAC_MASK			0x3F

arch/arm/mach-mx6/pcie.c

@@ -606,6 +606,7 @@ static void imx_pcie_enable_controller(struct device *dev)
 		pr_err("can't enable pcie clock.\n");
 		clk_put(pcie_clk);
 	}
+	imx_pcie_clrset(iomuxc_gpr1_pcie_ref_clk_en, 1 << 16, IOMUXC_GPR1);
 }
 
 static void card_reset(struct device *dev)
@@ -652,6 +653,9 @@ static void __init add_pcie_port(void __iomem *base, void __iomem *dbi_base,
 		clk_disable(pcie_clk);
 		clk_put(pcie_clk);
 
+		imx_pcie_clrset(iomuxc_gpr1_pcie_ref_clk_en, 0 << 16,
+				IOMUXC_GPR1);
+
 		/* Disable PCIE power */
 		gpio_request(pdata->pcie_pwr_en, "PCIE POWER_EN");
 
@@ -669,7 +673,6 @@ static int __devinit imx_pcie_pltfm_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct imx_pcie_platform_data *pdata = dev->platform_data;
 
-
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
 		dev_err(dev, "no mmio space\n");
@@ -698,15 +701,13 @@ static int __devinit imx_pcie_pltfm_probe(struct platform_device *pdev)
 
 	imx_pcie_clrset(iomuxc_gpr8_tx_deemph_gen1, 0 << 0, IOMUXC_GPR8);
 	imx_pcie_clrset(iomuxc_gpr8_tx_deemph_gen2_3p5db, 0 << 6, IOMUXC_GPR8);
-	imx_pcie_clrset(iomuxc_gpr8_tx_deemph_gen2_6db, 0 << 12, IOMUXC_GPR8);
+	imx_pcie_clrset(iomuxc_gpr8_tx_deemph_gen2_6db, 20 << 12, IOMUXC_GPR8);
 	imx_pcie_clrset(iomuxc_gpr8_tx_swing_full, 127 << 18, IOMUXC_GPR8);
 	imx_pcie_clrset(iomuxc_gpr8_tx_swing_low, 127 << 25, IOMUXC_GPR8);
 
 	/* Enable the pwr, clks and so on */
 	imx_pcie_enable_controller(dev);
 
-	imx_pcie_clrset(iomuxc_gpr1_pcie_ref_clk_en, 1 << 16, IOMUXC_GPR1);
-
 	/* togle the external card's reset */
 	card_reset(dev) ;
 
@@ -714,13 +715,6 @@ static int __devinit imx_pcie_pltfm_probe(struct platform_device *pdev)
 	imx_pcie_regions_setup(dbi_base);
 	usleep_range(3000, 4000);
 
-	/*
-	 * Force to GEN1 because of PCIE2USB storage stress tests
-	 * would be failed when GEN2 is enabled
-	 */
-	writel(((readl(dbi_base + LNK_CAP) & 0xfffffff0) | 0x1),
-			dbi_base + LNK_CAP);
-
 	/* start link up */
 	imx_pcie_clrset(iomuxc_gpr12_app_ltssm_enable, 1 << 10, IOMUXC_GPR12);
 
@@ -749,6 +743,8 @@ static int __devexit imx_pcie_pltfm_remove(struct platform_device *pdev)
 		clk_put(pcie_clk);
 	}
 
+	imx_pcie_clrset(iomuxc_gpr1_pcie_ref_clk_en, 0 << 16, IOMUXC_GPR1);
+
 	/* Disable PCIE power */
 	gpio_request(pdata->pcie_pwr_en, "PCIE POWER_EN");