// SPDX-License-Identifier: GPL-2.0
/*
* pcie-dra7xx - PCIe controller driver for TI DRA7xx SoCs
*
* Copyright (C) 2013-2014 Texas Instruments Incorporated - https://www.ti.com
*
* Authors: Kishon Vijay Abraham I <kishon@ti.com>
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.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.h>
#include <linux/of_gpio.h>
#include <linux/of_pci.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 <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
#include "../../pci.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_TI_CONF_DEVICE_TYPE 0x0100
#define DEVICE_TYPE_EP 0x0
#define DEVICE_TYPE_LEG_EP 0x1
#define DEVICE_TYPE_RC 0x4
#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
#define PCIECTRL_TI_CONF_INTX_ASSERT 0x0124
#define PCIECTRL_TI_CONF_INTX_DEASSERT 0x0128
#define PCIECTRL_TI_CONF_MSI_XMT 0x012c
#define MSI_REQ_GRANT BIT(0)
#define MSI_VECTOR_SHIFT 7
#define PCIE_1LANE_2LANE_SELECTION BIT(13)
#define PCIE_B1C0_MODE_SEL BIT(2)
#define PCIE_B0_B1_TSYNCEN BIT(0)
struct dra7xx_pcie {
struct dw_pcie *pci;
void __iomem *base; /* DT ti_conf */
int phy_count; /* DT phy-names count */
struct phy **phy;
struct irq_domain *irq_domain;
struct clk *clk;
enum dw_pcie_device_mode mode;
};
struct dra7xx_pcie_of_data {
enum dw_pcie_device_mode mode;
u32 b1co_mode_sel_mask;
};
#define to_dra7xx_pcie(x) dev_get_drvdata((x)->dev)
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 u64 dra7xx_pcie_cpu_addr_fixup(struct dw_pcie *pci, u64 pci_addr)
{
return pci_addr & DRA7XX_CPU_TO_BUS_ADDR;
}
static int dra7xx_pcie_link_up(struct dw_pcie *pci)
{
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
u32 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_PHY_CS);
return !!(reg & LINK_UP);
}
static void dra7xx_pcie_stop_link(struct dw_pcie *pci)
{
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
u32 reg;
reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
reg &= ~LTSSM_EN;
dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
}
static int dra7xx_pcie_establish_link(struct dw_pcie *pci)
{
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
struct device *dev = pci->dev;
u32 reg;
if (dw_pcie_link_up(pci)) {
dev_err(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 0;
}
static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
{
dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
LEG_EP_INTERRUPTS | MSI);
dra7xx_pcie_writel(dra7xx,
PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
MSI | LEG_EP_INTERRUPTS);
}
static void dra7xx_pcie_enable_wrapper_interrupts(struct dra7xx_pcie *dra7xx)
{
dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
INTERRUPTS);
dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN,
INTERRUPTS);
}
static void dra7xx_pcie_enable_interrupts(struct dra7xx_pcie *dra7xx)
{
dra7xx_pcie_enable_wrapper_interrupts(dra7xx);
dra7xx_pcie_enable_msi_interrupts(dra7xx);
}
static int dra7xx_pcie_host_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
dra7xx_pcie_enable_interrupts(dra7xx);
return 0;
}
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,
.xlate = pci_irqd_intx_xlate,
};
static int dra7xx_pcie_handle_msi(struct dw_pcie_rp *pp, int index)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
unsigned long val;
int pos;
val = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
(index * MSI_REG_CTRL_BLOCK_SIZE));
if (!val)
return 0;
pos = find_first_bit(&val, MAX_MSI_IRQS_PER_CTRL);
while (pos != MAX_MSI_IRQS_PER_CTRL) {
generic_handle_domain_irq(pp->irq_domain,
(index * MAX_MSI_IRQS_PER_CTRL) + pos);
pos++;
pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL, pos);
}
return 1;
}
static void dra7xx_pcie_handle_msi_irq(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
int ret, i, count, num_ctrls;
num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
/**
* Need to make sure all MSI status bits read 0 before exiting.
* Else, new MSI IRQs are not registered by the wrapper. Have an
* upperbound for the loop and exit the IRQ in case of IRQ flood
* to avoid locking up system in interrupt context.
*/
count = 0;
do {
ret = 0;
for (i = 0; i < num_ctrls; i++)
ret |= dra7xx_pcie_handle_msi(pp, i);
count++;
} while (ret && count <= 1000);
if (count > 1000)
dev_warn_ratelimited(pci->dev,
"Too many MSI IRQs to handle\n");
}
static void dra7xx_pcie_msi_irq_handler(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct dra7xx_pcie *dra7xx;
struct dw_pcie_rp *pp;
struct dw_pcie *pci;
unsigned long reg;
u32 bit;
chained_irq_enter(chip, desc);
pp = irq_desc_get_handler_data(desc);
pci = to_dw_pcie_from_pp(pp);
dra7xx = to_dra7xx_pcie(pci);
reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI);
dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI, reg);
switch (reg) {
case MSI:
dra7xx_pcie_handle_msi_irq(pp);
break;
case INTA:
case INTB:
case INTC:
case INTD:
for_each_set_bit(bit, ®, PCI_NUM_INTX)
generic_handle_domain_irq(dra7xx->irq_domain, bit);
break;
}
chained_irq_exit(chip, desc);
}
static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg)
{
struct dra7xx_pcie *dra7xx = arg;
struct dw_pcie *pci = dra7xx->pci;
struct device *dev = pci->dev;
struct dw_pcie_ep *ep = &pci->ep;
u32 reg;
reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN);
if (reg & ERR_SYS)
dev_dbg(dev, "System Error\n");
if (reg & ERR_FATAL)
dev_dbg(dev, "Fatal Error\n");
if (reg & ERR_NONFATAL)
dev_dbg(dev, "Non Fatal Error\n");
if (reg & ERR_COR)
dev_dbg(dev, "Correctable Error\n");
if (reg & ERR_AXI)
dev_dbg(dev, "AXI tag lookup fatal Error\n");
if (reg & ERR_ECRC)
dev_dbg(dev, "ECRC Error\n");
if (reg & PME_TURN_OFF)
dev_dbg(dev,
"Power Management Event Turn-Off message received\n");
if (reg & PME_TO_ACK)
dev_dbg(dev,
"Power Management Turn-Off Ack message received\n");
if (reg & PM_PME)
dev_dbg(dev, "PM Power Management Event message received\n");
if (reg & LINK_REQ_RST)
dev_dbg(dev, "Link Request Reset\n");
if (reg & LINK_UP_EVT) {
if (dra7xx->mode == DW_PCIE_EP_TYPE)
dw_pcie_ep_linkup(ep);
dev_dbg(dev, "Link-up state change\n");
}
if (reg & CFG_BME_EVT)
dev_dbg(dev, "CFG 'Bus Master Enable' change\n");
if (reg & CFG_MSE_EVT)
dev_dbg(dev, "CFG 'Memory Space Enable' change\n");
dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN, reg);
return IRQ_HANDLED;
}
static int dra7xx_pcie_init_irq_domain(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct device *dev = pci->dev;
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
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 -ENODEV;
}
irq_set_chained_handler_and_data(pp->irq, dra7xx_pcie_msi_irq_handler,
pp);
dra7xx->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
&intx_domain_ops, pp);
of_node_put(pcie_intc_node);
if (!dra7xx->irq_domain) {
dev_err(dev, "Failed to get a INTx IRQ domain\n");
return -ENODEV;
}
return 0;
}
static const struct dw_pcie_host_ops dra7xx_pcie_host_ops = {
.init = dra7xx_pcie_host_init,
};
static void dra7xx_pcie_ep_init(struct dw_pcie_ep *ep)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
enum pci_barno bar;
for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
dw_pcie_ep_reset_bar(pci, bar);
dra7xx_pcie_enable_wrapper_interrupts(dra7xx);
}
static void dra7xx_pcie_raise_intx_irq(struct dra7xx_pcie *dra7xx)
{
dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_INTX_ASSERT, 0x1);
mdelay(1);
dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_INTX_DEASSERT, 0x1);
}
static void dra7xx_pcie_raise_msi_irq(struct dra7xx_pcie *dra7xx,
u8 interrupt_num)
{
u32 reg;
reg = (interrupt_num - 1) << MSI_VECTOR_SHIFT;
reg |= MSI_REQ_GRANT;
dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_MSI_XMT, reg);
}
static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
unsigned int type, u16 interrupt_num)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
switch (type) {
case PCI_IRQ_INTX:
dra7xx_pcie_raise_intx_irq(dra7xx);
break;
case PCI_IRQ_MSI:
dra7xx_pcie_raise_msi_irq(dra7xx, interrupt_num);
break;
default:
dev_err(pci->dev, "UNKNOWN IRQ type\n");
}
return 0;
}
static const struct pci_epc_features dra7xx_pcie_epc_features = {
.linkup_notifier = true,
.msi_capable = true,
.msix_capable = false,
};
static const struct pci_epc_features*
dra7xx_pcie_get_features(struct dw_pcie_ep *ep)
{
return &dra7xx_pcie_epc_features;
}
static const struct dw_pcie_ep_ops pcie_ep_ops = {
.init = dra7xx_pcie_ep_init,
.raise_irq = dra7xx_pcie_raise_irq,
.get_features = dra7xx_pcie_get_features,
};
static int dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
struct platform_device *pdev)
{
int ret;
struct dw_pcie_ep *ep;
struct device *dev = &pdev->dev;
struct dw_pcie *pci = dra7xx->pci;
ep = &pci->ep;
ep->ops = &pcie_ep_ops;
pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "ep_dbics");
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
pci->dbi_base2 =
devm_platform_ioremap_resource_byname(pdev, "ep_dbics2");
if (IS_ERR(pci->dbi_base2))
return PTR_ERR(pci->dbi_base2);
ret = dw_pcie_ep_init(ep);
if (ret) {
dev_err(dev, "failed to initialize endpoint\n");
return ret;
}
return 0;
}
static int dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
struct platform_device *pdev)
{
int ret;
struct dw_pcie *pci = dra7xx->pci;
struct dw_pcie_rp *pp = &pci->pp;
struct device *dev = pci->dev;
pp->irq = platform_get_irq(pdev, 1);
if (pp->irq < 0)
return pp->irq;
/* MSI IRQ is muxed */
pp->msi_irq[0] = -ENODEV;
ret = dra7xx_pcie_init_irq_domain(pp);
if (ret < 0)
return ret;
pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "rc_dbics");
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
pp->ops = &dra7xx_pcie_host_ops;
ret = dw_pcie_host_init(pp);
if (ret) {
dev_err(dev, "failed to initialize host\n");
return ret;
}
return 0;
}
static const struct dw_pcie_ops dw_pcie_ops = {
.cpu_addr_fixup = dra7xx_pcie_cpu_addr_fixup,
.start_link = dra7xx_pcie_establish_link,
.stop_link = dra7xx_pcie_stop_link,
.link_up = dra7xx_pcie_link_up,
};
static void dra7xx_pcie_disable_phy(struct dra7xx_pcie *dra7xx)
{
int phy_count = dra7xx->phy_count;
while (phy_count--) {
phy_power_off(dra7xx->phy[phy_count]);
phy_exit(dra7xx->phy[phy_count]);
}
}
static int dra7xx_pcie_enable_phy(struct dra7xx_pcie *dra7xx)
{
int phy_count = dra7xx->phy_count;
int ret;
int i;
for (i = 0; i < phy_count; i++) {
ret = phy_set_mode(dra7xx->phy[i], PHY_MODE_PCIE);
if (ret < 0)
goto err_phy;
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;
}
static const struct dra7xx_pcie_of_data dra7xx_pcie_rc_of_data = {
.mode = DW_PCIE_RC_TYPE,
};
static const struct dra7xx_pcie_of_data dra7xx_pcie_ep_of_data = {
.mode = DW_PCIE_EP_TYPE,
};
static const struct dra7xx_pcie_of_data dra746_pcie_rc_of_data = {
.b1co_mode_sel_mask = BIT(2),
.mode = DW_PCIE_RC_TYPE,
};
static const struct dra7xx_pcie_of_data dra726_pcie_rc_of_data = {
.b1co_mode_sel_mask = GENMASK(3, 2),
.mode = DW_PCIE_RC_TYPE,
};
static const struct dra7xx_pcie_of_data dra746_pcie_ep_of_data = {
.b1co_mode_sel_mask = BIT(2),
.mode = DW_PCIE_EP_TYPE,
};
static const struct dra7xx_pcie_of_data dra726_pcie_ep_of_data = {
.b1co_mode_sel_mask = GENMASK(3, 2),
.mode = DW_PCIE_EP_TYPE,
};
static const struct of_device_id of_dra7xx_pcie_match[] = {
{
.compatible = "ti,dra7-pcie",
.data = &dra7xx_pcie_rc_of_data,
},
{
.compatible = "ti,dra7-pcie-ep",
.data = &dra7xx_pcie_ep_of_data,
},
{
.compatible = "ti,dra746-pcie-rc",
.data = &dra746_pcie_rc_of_data,
},
{
.compatible = "ti,dra726-pcie-rc",
.data = &dra726_pcie_rc_of_data,
},
{
.compatible = "ti,dra746-pcie-ep",
.data = &dra746_pcie_ep_of_data,
},
{
.compatible = "ti,dra726-pcie-ep",
.data = &dra726_pcie_ep_of_data,
},
{},
};
MODULE_DEVICE_TABLE(of, of_dra7xx_pcie_match);
/*
* dra7xx_pcie_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
* @dra7xx: the dra7xx device where the workaround should be applied
*
* Access to the PCIe slave port that are not 32-bit aligned will result
* in incorrect mapping to TLP Address and Byte enable fields. Therefore,
* byte and half-word accesses are not possible to byte offset 0x1, 0x2, or
* 0x3.
*
* To avoid this issue set PCIE_SS1_AXI2OCP_LEGACY_MODE_ENABLE to 1.
*/
static int dra7xx_pcie_unaligned_memaccess(struct device *dev)
{
int ret;
struct device_node *np = dev->of_node;
struct of_phandle_args args;
struct regmap *regmap;
regmap = syscon_regmap_lookup_by_phandle(np,
"ti,syscon-unaligned-access");
if (IS_ERR(regmap)) {
dev_dbg(dev, "can't get ti,syscon-unaligned-access\n");
return -EINVAL;
}
ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-unaligned-access",
2, 0, &args);
if (ret) {
dev_err(dev, "failed to parse ti,syscon-unaligned-access\n");
return ret;
}
ret = regmap_update_bits(regmap, args.args[0], args.args[1],
args.args[1]);
if (ret)
dev_err(dev, "failed to enable unaligned access\n");
of_node_put(args.np);
return ret;
}
static int dra7xx_pcie_configure_two_lane(struct device *dev,
u32 b1co_mode_sel_mask)
{
struct device_node *np = dev->of_node;
struct regmap *pcie_syscon;
unsigned int pcie_reg;
u32 mask;
u32 val;
pcie_syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-lane-sel");
if (IS_ERR(pcie_syscon)) {
dev_err(dev, "unable to get ti,syscon-lane-sel\n");
return -EINVAL;
}
if (of_property_read_u32_index(np, "ti,syscon-lane-sel", 1,
&pcie_reg)) {
dev_err(dev, "couldn't get lane selection reg offset\n");
return -EINVAL;
}
mask = b1co_mode_sel_mask | PCIE_B0_B1_TSYNCEN;
val = PCIE_B1C0_MODE_SEL | PCIE_B0_B1_TSYNCEN;
regmap_update_bits(pcie_syscon, pcie_reg, mask, val);
return 0;
}
static int dra7xx_pcie_probe(struct platform_device *pdev)
{
u32 reg;
int ret;
int irq;
int i;
int phy_count;
struct phy **phy;
struct device_link **link;
void __iomem *base;
struct dw_pcie *pci;
struct dra7xx_pcie *dra7xx;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
char name[10];
struct gpio_desc *reset;
const struct dra7xx_pcie_of_data *data;
enum dw_pcie_device_mode mode;
u32 b1co_mode_sel_mask;
data = of_device_get_match_data(dev);
if (!data)
return -EINVAL;
mode = (enum dw_pcie_device_mode)data->mode;
b1co_mode_sel_mask = data->b1co_mode_sel_mask;
dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
if (!dra7xx)
return -ENOMEM;
pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
if (!pci)
return -ENOMEM;
pci->dev = dev;
pci->ops = &dw_pcie_ops;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
base = devm_platform_ioremap_resource_byname(pdev, "ti_conf");
if (IS_ERR(base))
return PTR_ERR(base);
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_kcalloc(dev, phy_count, sizeof(*phy), GFP_KERNEL);
if (!phy)
return -ENOMEM;
link = devm_kcalloc(dev, phy_count, sizeof(*link), GFP_KERNEL);
if (!link)
return -ENOMEM;
dra7xx->clk = devm_clk_get_optional(dev, NULL);
if (IS_ERR(dra7xx->clk))
return dev_err_probe(dev, PTR_ERR(dra7xx->clk),
"clock request failed");
ret = clk_prepare_enable(dra7xx->clk);
if (ret)
return ret;
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]);
link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
if (!link[i]) {
ret = -EINVAL;
goto err_link;
}
}
dra7xx->base = base;
dra7xx->phy = phy;
dra7xx->pci = pci;
dra7xx->phy_count = phy_count;
if (phy_count == 2) {
ret = dra7xx_pcie_configure_two_lane(dev, b1co_mode_sel_mask);
if (ret < 0)
dra7xx->phy_count = 1; /* Fallback to x1 lane mode */
}
ret = dra7xx_pcie_enable_phy(dra7xx);
if (ret) {
dev_err(dev, "failed to enable phy\n");
return ret;
}
platform_set_drvdata(pdev, dra7xx);
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;
}
reset = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
if (IS_ERR(reset)) {
ret = PTR_ERR(reset);
dev_err(&pdev->dev, "gpio request failed, ret %d\n", ret);
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);
switch (mode) {
case DW_PCIE_RC_TYPE:
if (!IS_ENABLED(CONFIG_PCI_DRA7XX_HOST)) {
ret = -ENODEV;
goto err_gpio;
}
dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
DEVICE_TYPE_RC);
ret = dra7xx_pcie_unaligned_memaccess(dev);
if (ret)
dev_err(dev, "WA for Errata i870 not applied\n");
ret = dra7xx_add_pcie_port(dra7xx, pdev);
if (ret < 0)
goto err_gpio;
break;
case DW_PCIE_EP_TYPE:
if (!IS_ENABLED(CONFIG_PCI_DRA7XX_EP)) {
ret = -ENODEV;
goto err_gpio;
}
dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
DEVICE_TYPE_EP);
ret = dra7xx_pcie_unaligned_memaccess(dev);
if (ret)
goto err_gpio;
ret = dra7xx_add_pcie_ep(dra7xx, pdev);
if (ret < 0)
goto err_gpio;
break;
default:
dev_err(dev, "INVALID device type %d\n", mode);
}
dra7xx->mode = mode;
ret = devm_request_threaded_irq(dev, irq, NULL, dra7xx_pcie_irq_handler,
IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
if (ret) {
dev_err(dev, "failed to request irq\n");
goto err_gpio;
}
return 0;
err_gpio:
err_get_sync:
pm_runtime_put(dev);
pm_runtime_disable(dev);
dra7xx_pcie_disable_phy(dra7xx);
err_link:
while (--i >= 0)
device_link_del(link[i]);
return ret;
}
static int dra7xx_pcie_suspend(struct device *dev)
{
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
struct dw_pcie *pci = dra7xx->pci;
u32 val;
if (dra7xx->mode != DW_PCIE_RC_TYPE)
return 0;
/* clear MSE */
val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
val &= ~PCI_COMMAND_MEMORY;
dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
return 0;
}
static int dra7xx_pcie_resume(struct device *dev)
{
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
struct dw_pcie *pci = dra7xx->pci;
u32 val;
if (dra7xx->mode != DW_PCIE_RC_TYPE)
return 0;
/* set MSE */
val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
val |= PCI_COMMAND_MEMORY;
dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
return 0;
}
static int dra7xx_pcie_suspend_noirq(struct device *dev)
{
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
dra7xx_pcie_disable_phy(dra7xx);
return 0;
}
static int dra7xx_pcie_resume_noirq(struct device *dev)
{
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
int ret;
ret = dra7xx_pcie_enable_phy(dra7xx);
if (ret) {
dev_err(dev, "failed to enable phy\n");
return ret;
}
return 0;
}
static void dra7xx_pcie_shutdown(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
int ret;
dra7xx_pcie_stop_link(dra7xx->pci);
ret = pm_runtime_put_sync(dev);
if (ret < 0)
dev_dbg(dev, "pm_runtime_put_sync failed\n");
pm_runtime_disable(dev);
dra7xx_pcie_disable_phy(dra7xx);
clk_disable_unprepare(dra7xx->clk);
}
static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
dra7xx_pcie_resume_noirq)
};
static struct platform_driver dra7xx_pcie_driver = {
.probe = dra7xx_pcie_probe,
.driver = {
.name = "dra7-pcie",
.of_match_table = of_dra7xx_pcie_match,
.suppress_bind_attrs = true,
.pm = &dra7xx_pcie_pm_ops,
},
.shutdown = dra7xx_pcie_shutdown,
};
module_platform_driver(dra7xx_pcie_driver);
MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
MODULE_DESCRIPTION("PCIe controller driver for TI DRA7xx SoCs");
MODULE_LICENSE("GPL v2");
