/*
* 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@ti.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/of_gpio.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)
#define DRA7XX_CPU_TO_BUS_ADDR 0x0FFFFFFF
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 inline u32 dra7xx_pcie_readl_rc(struct pcie_port *pp, u32 offset)
{
return readl(pp->dbi_base + offset);
}
static inline void dra7xx_pcie_writel_rc(struct pcie_port *pp, u32 offset,
u32 value)
{
writel(value, pp->dbi_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)
{
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
u32 reg;
unsigned int retries;
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);
for (retries = 0; retries < 1000; retries++) {
if (dw_pcie_link_up(pp))
return 0;
usleep_range(10, 20);
}
dev_err(pp->dev, "link is not up\n");
return -EINVAL;
}
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);
pp->io_base &= DRA7XX_CPU_TO_BUS_ADDR;
pp->mem_base &= DRA7XX_CPU_TO_BUS_ADDR;
pp->cfg0_base &= DRA7XX_CPU_TO_BUS_ADDR;
pp->cfg1_base &= DRA7XX_CPU_TO_BUS_ADDR;
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);
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 __init dra7xx_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 | IRQF_NO_THREAD,
"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];
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 __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;
}
#ifdef CONFIG_PM_SLEEP
static int dra7xx_pcie_suspend(struct device *dev)
{
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
struct pcie_port *pp = &dra7xx->pp;
u32 val;
/* clear MSE */
val = dra7xx_pcie_readl_rc(pp, PCI_COMMAND);
val &= ~PCI_COMMAND_MEMORY;
dra7xx_pcie_writel_rc(pp, PCI_COMMAND, val);
return 0;
}
static int dra7xx_pcie_resume(struct device *dev)
{
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
struct pcie_port *pp = &dra7xx->pp;
u32 val;
/* set MSE */
val = dra7xx_pcie_readl_rc(pp, PCI_COMMAND);
val |= PCI_COMMAND_MEMORY;
dra7xx_pcie_writel_rc(pp, PCI_COMMAND, val);
return 0;
}
static int dra7xx_pcie_suspend_noirq(struct device *dev)
{
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
int count = dra7xx->phy_count;
while (count--) {
phy_power_off(dra7xx->phy[count]);
phy_exit(dra7xx->phy[count]);
}
return 0;
}
static int dra7xx_pcie_resume_noirq(struct device *dev)
{
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
int phy_count = dra7xx->phy_count;
int ret;
int i;
for (i = 0; i < phy_count; i++) {
ret = phy_init(dra7xx->phy[i]);
if (ret < 0)
goto err_phy;
ret = phy_power_on(dra7xx->phy[i]);
if (ret < 0) {
phy_exit(dra7xx->phy[i]);
goto err_phy;
}
}
return 0;
err_phy:
while (--i >= 0) {
phy_power_off(dra7xx->phy[i]);
phy_exit(dra7xx->phy[i]);
}
return ret;
}
#endif
static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
dra7xx_pcie_resume_noirq)
};
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",
.of_match_table = of_dra7xx_pcie_match,
.pm = &dra7xx_pcie_pm_ops,
},
};
module_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
MODULE_DESCRIPTION("TI PCIe controller driver");
MODULE_LICENSE("GPL v2");