Message-id: <008c01cfa169$0ca6cdd0$25f46970$%han@samsung.com>
Date:	Thu, 17 Jul 2014 11:44:37 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Kishon Vijay Abraham I' <kishon@...com>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>
Cc:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-pci@...r.kernel.org, 'Mohit Kumar' <mohit.kumar@...com>,
	linux-kernel@...r.kernel.org,
	'Grant Likely' <grant.likely@...aro.org>,
	'Jason Gunthorpe' <jgunthorpe@...idianresearch.com>,
	'Marek Vasut' <marex@...x.de>, 'Arnd Bergmann' <arnd@...db.de>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v2 4/4] PCI: host: pcie-dra7xx: add support for pcie-dra7xx
 controller

On Monday, July 14, 2014 11:55 PM, Kishon Vijay Abraham I wrote:
> 
> Added support for pcie controller in dra7xx. This driver re-uses
> the designware core code that is already present in kernel.
> 
> Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Mohit Kumar <mohit.kumar@...com>
> Cc: Jingoo Han <jg1.han@...sung.com>

Acked-by: Jingoo Han <jg1.han@...sung.com>

Best regards,
Jingoo Han

> Cc: Marek Vasut <marex@...x.de>
> Cc: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/pci/host/Kconfig      |   10 +
>  drivers/pci/host/Makefile     |    1 +
>  drivers/pci/host/pci-dra7xx.c |  458 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 469 insertions(+)
>  create mode 100644 drivers/pci/host/pci-dra7xx.c
> 
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index 21df477..22117b0 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -1,6 +1,16 @@
>  menu "PCI host controller drivers"
>  	depends on PCI
> 
> +config PCI_DRA7XX
> +	bool "TI DRA7xx PCIe controller"
> +	select PCIE_DW
> +	depends on OF && HAS_IOMEM && TI_PIPE3
> +	help
> +	 Enables support for the PCIE controller present in DRA7xx SoC. There
> +	 are two instances of PCIE controller in DRA7xx. This controller can
> +	 act both as EP and RC. This reuses the same Designware core as used
> +	 by other SoCs.
> +
>  config PCI_MVEBU
>  	bool "Marvell EBU PCIe controller"
>  	depends on ARCH_MVEBU || ARCH_DOVE || ARCH_KIRKWOOD
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index 611ba4b..c42844d 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -1,4 +1,5 @@
>  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> +obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
>  obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
>  obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
>  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
> diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
> new file mode 100644
> index 0000000..52b34fe
> --- /dev/null
> +++ b/drivers/pci/host/pci-dra7xx.c
> @@ -0,0 +1,458 @@
> +/*
> + * pcie-dra7xx - PCIe controller driver for TI DRA7xx SoCs
> + *
> + * Copyright (C) 2013-2014 Texas Instruments Incorporated - http://www.ti.com
> + *
> + * Authors: Kishon Vijay Abraham I <kishon@...com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/resource.h>
> +#include <linux/types.h>
> +
> +#include "pcie-designware.h"
> +
> +/* PCIe controller wrapper DRA7XX configuration registers */
> +
> +#define	PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN		0x0024
> +#define	PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN		0x0028
> +#define	ERR_SYS						BIT(0)
> +#define	ERR_FATAL					BIT(1)
> +#define	ERR_NONFATAL					BIT(2)
> +#define	ERR_COR						BIT(3)
> +#define	ERR_AXI						BIT(4)
> +#define	ERR_ECRC					BIT(5)
> +#define	PME_TURN_OFF					BIT(8)
> +#define	PME_TO_ACK					BIT(9)
> +#define	PM_PME						BIT(10)
> +#define	LINK_REQ_RST					BIT(11)
> +#define	LINK_UP_EVT					BIT(12)
> +#define	CFG_BME_EVT					BIT(13)
> +#define	CFG_MSE_EVT					BIT(14)
> +#define	INTERRUPTS (ERR_SYS | ERR_FATAL | ERR_NONFATAL | ERR_COR | ERR_AXI | \
> +			ERR_ECRC | PME_TURN_OFF | PME_TO_ACK | PM_PME | \
> +			LINK_REQ_RST | LINK_UP_EVT | CFG_BME_EVT | CFG_MSE_EVT)
> +
> +#define	PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI		0x0034
> +#define	PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI		0x0038
> +#define	INTA						BIT(0)
> +#define	INTB						BIT(1)
> +#define	INTC						BIT(2)
> +#define	INTD						BIT(3)
> +#define	MSI						BIT(4)
> +#define	LEG_EP_INTERRUPTS (INTA | INTB | INTC | INTD)
> +
> +#define	PCIECTRL_DRA7XX_CONF_DEVICE_CMD			0x0104
> +#define	LTSSM_EN					0x1
> +
> +#define	PCIECTRL_DRA7XX_CONF_PHY_CS			0x010C
> +#define	LINK_UP						BIT(16)
> +
> +struct dra7xx_pcie {
> +	void __iomem		*base;
> +	struct phy		**phy;
> +	int			phy_count;
> +	struct device		*dev;
> +	struct pcie_port	pp;
> +};
> +
> +#define to_dra7xx_pcie(x)	container_of((x), struct dra7xx_pcie, pp)
> +
> +static inline u32 dra7xx_pcie_readl(struct dra7xx_pcie *pcie, u32 offset)
> +{
> +	return readl(pcie->base + offset);
> +}
> +
> +static inline void dra7xx_pcie_writel(struct dra7xx_pcie *pcie, u32 offset,
> +				      u32 value)
> +{
> +	writel(value, pcie->base + offset);
> +}
> +
> +static int dra7xx_pcie_link_up(struct pcie_port *pp)
> +{
> +	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
> +	u32 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_PHY_CS);
> +
> +	return !!(reg & LINK_UP);
> +}
> +
> +static int dra7xx_pcie_establish_link(struct pcie_port *pp)
> +{
> +	u32 reg;
> +	unsigned int retries = 1000;
> +	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
> +
> +	if (dw_pcie_link_up(pp)) {
> +		dev_err(pp->dev, "link is already up\n");
> +		return 0;
> +	}
> +
> +	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
> +	reg |= LTSSM_EN;
> +	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
> +
> +	while (retries--) {
> +		reg = dra7xx_pcie_readl(dra7xx,	PCIECTRL_DRA7XX_CONF_PHY_CS);
> +		if (reg & LINK_UP)
> +			break;
> +		usleep_range(10, 20);
> +	}
> +
> +	if (retries == 0) {
> +		dev_err(pp->dev, "link is not up\n");
> +		return -ETIMEDOUT;
> +	}
> +
> +	return 0;
> +}
> +
> +static void dra7xx_pcie_enable_interrupts(struct pcie_port *pp)
> +{
> +	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
> +
> +	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
> +			   ~INTERRUPTS);
> +	dra7xx_pcie_writel(dra7xx,
> +			   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN, INTERRUPTS);
> +	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
> +			   ~LEG_EP_INTERRUPTS & ~MSI);
> +
> +	if (IS_ENABLED(CONFIG_PCI_MSI))
> +		dra7xx_pcie_writel(dra7xx,
> +				   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI, MSI);
> +	else
> +		dra7xx_pcie_writel(dra7xx,
> +				   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
> +				   LEG_EP_INTERRUPTS);
> +}
> +
> +static void dra7xx_pcie_host_init(struct pcie_port *pp)
> +{
> +	dw_pcie_setup_rc(pp);
> +	dra7xx_pcie_establish_link(pp);
> +	if (IS_ENABLED(CONFIG_PCI_MSI))
> +		dw_pcie_msi_init(pp);
> +	dra7xx_pcie_enable_interrupts(pp);
> +}
> +
> +static struct pcie_host_ops dra7xx_pcie_host_ops = {
> +	.link_up = dra7xx_pcie_link_up,
> +	.host_init = dra7xx_pcie_host_init,
> +};
> +
> +static int dra7xx_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
> +				irq_hw_number_t hwirq)
> +{
> +	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
> +	irq_set_chip_data(irq, domain->host_data);
> +	set_irq_flags(irq, IRQF_VALID);
> +
> +	return 0;
> +}
> +
> +static const struct irq_domain_ops intx_domain_ops = {
> +	.map = dra7xx_pcie_intx_map,
> +};
> +
> +static int dra7xx_pcie_init_irq_domain(struct pcie_port *pp)
> +{
> +	struct device *dev = pp->dev;
> +	struct device_node *node = dev->of_node;
> +	struct device_node *pcie_intc_node =  of_get_next_child(node, NULL);
> +
> +	if (!pcie_intc_node) {
> +		dev_err(dev, "No PCIe Intc node found\n");
> +		return PTR_ERR(pcie_intc_node);
> +	}
> +
> +	pp->irq_domain = irq_domain_add_linear(pcie_intc_node, 4,
> +					       &intx_domain_ops, pp);
> +	if (!pp->irq_domain) {
> +		dev_err(dev, "Failed to get a INTx IRQ domain\n");
> +		return PTR_ERR(pp->irq_domain);
> +	}
> +
> +	return 0;
> +}
> +
> +static irqreturn_t dra7xx_pcie_msi_irq_handler(int irq, void *arg)
> +{
> +	struct pcie_port *pp = arg;
> +	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
> +	u32 reg;
> +
> +	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI);
> +
> +	switch (reg) {
> +	case MSI:
> +		dw_handle_msi_irq(pp);
> +		break;
> +	case INTA:
> +	case INTB:
> +	case INTC:
> +	case INTD:
> +		generic_handle_irq(irq_find_mapping(pp->irq_domain, ffs(reg)));
> +		break;
> +	}
> +
> +	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI, reg);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +
> +static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg)
> +{
> +	struct dra7xx_pcie *dra7xx = arg;
> +	u32 reg;
> +
> +	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN);
> +
> +	if (reg & ERR_SYS)
> +		dev_dbg(dra7xx->dev, "System Error\n");
> +
> +	if (reg & ERR_FATAL)
> +		dev_dbg(dra7xx->dev, "Fatal Error\n");
> +
> +	if (reg & ERR_NONFATAL)
> +		dev_dbg(dra7xx->dev, "Non Fatal Error\n");
> +
> +	if (reg & ERR_COR)
> +		dev_dbg(dra7xx->dev, "Correctable Error\n");
> +
> +	if (reg & ERR_AXI)
> +		dev_dbg(dra7xx->dev, "AXI tag lookup fatal Error\n");
> +
> +	if (reg & ERR_ECRC)
> +		dev_dbg(dra7xx->dev, "ECRC Error\n");
> +
> +	if (reg & PME_TURN_OFF)
> +		dev_dbg(dra7xx->dev,
> +			"Power Management Event Turn-Off message received\n");
> +
> +	if (reg & PME_TO_ACK)
> +		dev_dbg(dra7xx->dev,
> +			"Power Management Turn-Off Ack message received\n");
> +
> +	if (reg & PM_PME)
> +		dev_dbg(dra7xx->dev,
> +			"PM Power Management Event message received\n");
> +
> +	if (reg & LINK_REQ_RST)
> +		dev_dbg(dra7xx->dev, "Link Request Reset\n");
> +
> +	if (reg & LINK_UP_EVT)
> +		dev_dbg(dra7xx->dev, "Link-up state change\n");
> +
> +	if (reg & CFG_BME_EVT)
> +		dev_dbg(dra7xx->dev, "CFG 'Bus Master Enable' change\n");
> +
> +	if (reg & CFG_MSE_EVT)
> +		dev_dbg(dra7xx->dev, "CFG 'Memory Space Enable' change\n");
> +
> +	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN, reg);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int add_pcie_port(struct dra7xx_pcie *dra7xx,
> +			  struct platform_device *pdev)
> +{
> +	int ret;
> +	struct pcie_port *pp;
> +	struct resource *res;
> +	struct device *dev = &pdev->dev;
> +
> +	pp = &dra7xx->pp;
> +	pp->dev = dev;
> +	pp->ops = &dra7xx_pcie_host_ops;
> +
> +	pp->irq = platform_get_irq(pdev, 1);
> +	if (pp->irq < 0) {
> +		dev_err(dev, "missing IRQ resource\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, pp->irq,
> +			       dra7xx_pcie_msi_irq_handler, IRQF_SHARED,
> +			       "dra7-pcie-msi",	pp);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to request irq\n");
> +		return ret;
> +	}
> +
> +	if (!IS_ENABLED(CONFIG_PCI_MSI)) {
> +		ret = dra7xx_pcie_init_irq_domain(pp);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbics");
> +	pp->dbi_base = devm_ioremap(dev, res->start, resource_size(res));
> +	if (!pp->dbi_base)
> +		return -ENOMEM;
> +
> +	ret = dw_pcie_host_init(pp);
> +	if (ret) {
> +		dev_err(dra7xx->dev, "failed to initialize host\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int __init dra7xx_pcie_probe(struct platform_device *pdev)
> +{
> +	u32 reg;
> +	int ret;
> +	int irq;
> +	int i;
> +	int phy_count;
> +	struct phy **phy;
> +	void __iomem *base;
> +	struct resource *res;
> +	struct dra7xx_pcie *dra7xx;
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	char name[10];
> +
> +	dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
> +	if (!dra7xx)
> +		return -ENOMEM;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev, "missing IRQ resource\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = devm_request_irq(dev, irq, dra7xx_pcie_irq_handler,
> +			       IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
> +	if (ret) {
> +		dev_err(dev, "failed to request irq\n");
> +		return ret;
> +	}
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ti_conf");
> +	base = devm_ioremap_nocache(dev, res->start, resource_size(res));
> +	if (!base)
> +		return -ENOMEM;
> +
> +	phy_count = of_property_count_strings(np, "phy-names");
> +	if (phy_count < 0) {
> +		dev_err(dev, "unable to find the strings\n");
> +		return phy_count;
> +	}
> +
> +	phy = devm_kzalloc(dev, sizeof(*phy) * phy_count, GFP_KERNEL);
> +	if (!phy)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < phy_count; i++) {
> +		snprintf(name, sizeof(name), "pcie-phy%d", i);
> +		phy[i] = devm_phy_get(dev, name);
> +		if (IS_ERR(phy[i]))
> +			return PTR_ERR(phy[i]);
> +
> +		ret = phy_init(phy[i]);
> +		if (ret < 0)
> +			goto err_phy;
> +
> +		ret = phy_power_on(phy[i]);
> +		if (ret < 0) {
> +			phy_exit(phy[i]);
> +			goto err_phy;
> +		}
> +	}
> +
> +	dra7xx->base = base;
> +	dra7xx->phy = phy;
> +	dra7xx->dev = dev;
> +	dra7xx->phy_count = phy_count;
> +
> +	pm_runtime_enable(dev);
> +	ret = pm_runtime_get_sync(dev);
> +	if (IS_ERR_VALUE(ret)) {
> +		dev_err(dev, "pm_runtime_get_sync failed\n");
> +		goto err_phy;
> +	}
> +
> +	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
> +	reg &= ~LTSSM_EN;
> +	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
> +
> +	platform_set_drvdata(pdev, dra7xx);
> +
> +	ret = add_pcie_port(dra7xx, pdev);
> +	if (ret < 0)
> +		goto err_add_port;
> +
> +	return 0;
> +
> +err_add_port:
> +	pm_runtime_put(dev);
> +	pm_runtime_disable(dev);
> +
> +err_phy:
> +	while (--i >= 0) {
> +		phy_power_off(phy[i]);
> +		phy_exit(phy[i]);
> +	}
> +
> +	return ret;
> +}
> +
> +static int __exit dra7xx_pcie_remove(struct platform_device *pdev)
> +{
> +	struct dra7xx_pcie *dra7xx = platform_get_drvdata(pdev);
> +	struct pcie_port *pp = &dra7xx->pp;
> +	struct device *dev = &pdev->dev;
> +	int count = dra7xx->phy_count;
> +
> +	if (pp->irq_domain)
> +		irq_domain_remove(pp->irq_domain);
> +	pm_runtime_put(dev);
> +	pm_runtime_disable(dev);
> +	while (count--) {
> +		phy_power_off(dra7xx->phy[count]);
> +		phy_exit(dra7xx->phy[count]);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id of_dra7xx_pcie_match[] = {
> +	{ .compatible = "ti,dra7-pcie", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, of_dra7xx_pcie_match);
> +
> +static struct platform_driver dra7xx_pcie_driver = {
> +	.remove		= __exit_p(dra7xx_pcie_remove),
> +	.driver = {
> +		.name	= "dra7-pcie",
> +		.owner	= THIS_MODULE,
> +		.of_match_table = of_dra7xx_pcie_match,
> +	},
> +};
> +
> +module_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
> +
> +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@...com>");
> +MODULE_DESCRIPTION("TI PCIe controller driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.9.5

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