Commit e6f1fef0 authored by Andrey Smirnov's avatar Andrey Smirnov Committed by Bjorn Helgaas
Browse files

PCI: imx6: Use enum instead of bool for variant indicator 



Use enumerated type instead of a boolean flag to specify the variant of
the PCIe IP block (6Q, 6SX, etc).  This patch has zero functional impact,
however it makes the code easier to extend for the case of more than 2
possible variants of an IP block (of which there are).

[bhelgaas: rewrap comment, remove extra blank line]
Signed-off-by: default avatarAndrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarFabio Estevam <fabio.estevam@nxp.com>
parent a5fcec48

drivers/pci/host/pci-imx6.c

+69 −58
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>

#include <linux/module.h>

#include <linux/of_gpio.h>

#include <linux/of_device.h>

#include <linux/pci.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>
@@ -31,6 +32,11 @@ 


#define to_imx6_pcie(x)	container_of(x, struct imx6_pcie, pp)



enum imx6_pcie_variants {

	IMX6Q,

	IMX6SX

};



struct imx6_pcie {

	int			reset_gpio;

	bool			gpio_active_high;
@@ -40,7 +46,7 @@ struct imx6_pcie { 
	struct clk		*pcie;

	struct pcie_port	pp;

	struct regmap		*iomuxc_gpr;

	bool			is_imx6sx;

	enum imx6_pcie_variants variant;

	void __iomem		*mem_base;

	u32			tx_deemph_gen1;

	u32			tx_deemph_gen2_3p5db;
@@ -240,7 +246,8 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) 
	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);

	u32 val, gpr1, gpr12;



	if (imx6_pcie->is_imx6sx) {

	switch (imx6_pcie->variant) {

	case IMX6SX:

		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,

				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,

				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
@@ -248,19 +255,20 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) 
		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,

				   IMX6SX_GPR5_PCIE_BTNRST_RESET,

				   IMX6SX_GPR5_PCIE_BTNRST_RESET);

		return 0;

	}



		break;

	case IMX6Q:

		/*

	 * If the bootloader already enabled the link we need some special

	 * handling to get the core back into a state where it is safe to

	 * touch it for configuration.  As there is no dedicated reset signal

	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"

	 * state before completely disabling LTSSM, which is a prerequisite

	 * for core configuration.

		 * If the bootloader already enabled the link we need some

		 * special handling to get the core back into a state where

		 * it is safe to touch it for configuration.  As there is

		 * no dedicated reset signal wired up for MX6QDL, we need

		 * to manually force LTSSM into "detect" state before

		 * completely disabling LTSSM, which is a prerequisite for

		 * core configuration.

		 *

	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong

	 * indication that the bootloader activated the link.

		 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we

		 * have a strong indication that the bootloader activated

		 * the link.

		 */

		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);

		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
@@ -280,6 +288,8 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) 
				   IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);

		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,

				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);

		break;

	}



	return 0;

}
@@ -287,20 +297,20 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) 
static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)

{

	struct pcie_port *pp = &imx6_pcie->pp;

	int ret;

	int ret = 0;



	if (imx6_pcie->is_imx6sx) {

	switch (imx6_pcie->variant) {

	case IMX6SX:

		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);

		if (ret) {

			dev_err(pp->dev, "unable to enable pcie_axi clock\n");

			return ret;

			break;

		}



		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,

				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);

		return ret;

	}



		break;

	case IMX6Q:

		/* power up core phy and enable ref clock */

		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,

				   IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
@@ -313,7 +323,10 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) 
		udelay(10);

		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,

				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);

	return 0;

		break;

	}



	return ret;

}



static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
@@ -357,7 +370,7 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) 
					!imx6_pcie->gpio_active_high);

	}



	if (imx6_pcie->is_imx6sx)

	if (imx6_pcie->variant == IMX6SX)

		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,

				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
@@ -371,18 +384,16 @@ err_pcie_bus: 
	clk_disable_unprepare(imx6_pcie->pcie_phy);

err_pcie_phy:

	return ret;



}



static void imx6_pcie_init_phy(struct pcie_port *pp)

{

	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);



	if (imx6_pcie->is_imx6sx) {

	if (imx6_pcie->variant == IMX6SX)

		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,

				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,

				   IMX6SX_GPR12_PCIE_RX_EQ_2);

	}



	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,

			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
@@ -593,8 +604,8 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) 
	pp = &imx6_pcie->pp;

	pp->dev = &pdev->dev;



	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,

						       "fsl,imx6sx-pcie");

	imx6_pcie->variant =

		(enum imx6_pcie_variants)of_device_get_match_data(&pdev->dev);



	/* Added for PCI abort handling */

	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
@@ -643,7 +654,7 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) 
		return PTR_ERR(imx6_pcie->pcie);

	}



	if (imx6_pcie->is_imx6sx) {

	if (imx6_pcie->variant == IMX6SX) {

		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,

							   "pcie_inbound_axi");

		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
@@ -705,8 +716,8 @@ static void imx6_pcie_shutdown(struct platform_device *pdev) 
}



static const struct of_device_id imx6_pcie_of_match[] = {

	{ .compatible = "fsl,imx6q-pcie", },

	{ .compatible = "fsl,imx6sx-pcie", },

	{ .compatible = "fsl,imx6q-pcie",  .data = (void *)IMX6Q,  },

	{ .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, },

	{},

};

MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);

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