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;
}
예제 #2
0
파일: pci-dra7xx.c 프로젝트: AK101111/linux
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);
}
예제 #3
0
파일: pci-dra7xx.c 프로젝트: AK101111/linux
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;
}
예제 #4
0
파일: pci-dra7xx.c 프로젝트: AK101111/linux
static int dra7xx_pcie_establish_link(struct pcie_port *pp)
{
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
	u32 reg;

	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);

	return dw_pcie_wait_for_link(pp);
}
예제 #5
0
파일: pci-dra7xx.c 프로젝트: AK101111/linux
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;
}
예제 #6
0
파일: pci-dra7xx.c 프로젝트: AK101111/linux
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];
	int gpio_sel;
	enum of_gpio_flags flags;
	unsigned long gpio_flags;

	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 (ret < 0) {
		dev_err(dev, "pm_runtime_get_sync failed\n");
		goto err_get_sync;
	}

	gpio_sel = of_get_gpio_flags(dev->of_node, 0, &flags);
	if (gpio_is_valid(gpio_sel)) {
		gpio_flags = (flags & OF_GPIO_ACTIVE_LOW) ?
				GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
		ret = devm_gpio_request_one(dev, gpio_sel, gpio_flags,
					    "pcie_reset");
		if (ret) {
			dev_err(&pdev->dev, "gpio%d request failed, ret %d\n",
				gpio_sel, ret);
			goto err_gpio;
		}
	} else if (gpio_sel == -EPROBE_DEFER) {
		ret = -EPROBE_DEFER;
		goto err_gpio;
	}

	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 = dra7xx_add_pcie_port(dra7xx, pdev);
	if (ret < 0)
		goto err_gpio;

	return 0;

err_gpio:
	pm_runtime_put(dev);

err_get_sync:
	pm_runtime_disable(dev);

err_phy:
	while (--i >= 0) {
		phy_power_off(phy[i]);
		phy_exit(phy[i]);
	}

	return ret;
}
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;
}