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 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 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);
}
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 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;
}