linuxdebug/drivers/pci/controller/pcie-mediatek-gen3.c

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2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* MediaTek PCIe host controller driver.
*
* Copyright (c) 2020 MediaTek Inc.
* Author: Jianjun Wang <jianjun.wang@mediatek.com>
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/pci.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include "../pci.h"
#define PCIE_SETTING_REG 0x80
#define PCIE_PCI_IDS_1 0x9c
#define PCI_CLASS(class) (class << 8)
#define PCIE_RC_MODE BIT(0)
#define PCIE_CFGNUM_REG 0x140
#define PCIE_CFG_DEVFN(devfn) ((devfn) & GENMASK(7, 0))
#define PCIE_CFG_BUS(bus) (((bus) << 8) & GENMASK(15, 8))
#define PCIE_CFG_BYTE_EN(bytes) (((bytes) << 16) & GENMASK(19, 16))
#define PCIE_CFG_FORCE_BYTE_EN BIT(20)
#define PCIE_CFG_OFFSET_ADDR 0x1000
#define PCIE_CFG_HEADER(bus, devfn) \
(PCIE_CFG_BUS(bus) | PCIE_CFG_DEVFN(devfn))
#define PCIE_RST_CTRL_REG 0x148
#define PCIE_MAC_RSTB BIT(0)
#define PCIE_PHY_RSTB BIT(1)
#define PCIE_BRG_RSTB BIT(2)
#define PCIE_PE_RSTB BIT(3)
#define PCIE_LTSSM_STATUS_REG 0x150
#define PCIE_LTSSM_STATE_MASK GENMASK(28, 24)
#define PCIE_LTSSM_STATE(val) ((val & PCIE_LTSSM_STATE_MASK) >> 24)
#define PCIE_LTSSM_STATE_L2_IDLE 0x14
#define PCIE_LINK_STATUS_REG 0x154
#define PCIE_PORT_LINKUP BIT(8)
#define PCIE_MSI_SET_NUM 8
#define PCIE_MSI_IRQS_PER_SET 32
#define PCIE_MSI_IRQS_NUM \
(PCIE_MSI_IRQS_PER_SET * PCIE_MSI_SET_NUM)
#define PCIE_INT_ENABLE_REG 0x180
#define PCIE_MSI_ENABLE GENMASK(PCIE_MSI_SET_NUM + 8 - 1, 8)
#define PCIE_MSI_SHIFT 8
#define PCIE_INTX_SHIFT 24
#define PCIE_INTX_ENABLE \
GENMASK(PCIE_INTX_SHIFT + PCI_NUM_INTX - 1, PCIE_INTX_SHIFT)
#define PCIE_INT_STATUS_REG 0x184
#define PCIE_MSI_SET_ENABLE_REG 0x190
#define PCIE_MSI_SET_ENABLE GENMASK(PCIE_MSI_SET_NUM - 1, 0)
#define PCIE_MSI_SET_BASE_REG 0xc00
#define PCIE_MSI_SET_OFFSET 0x10
#define PCIE_MSI_SET_STATUS_OFFSET 0x04
#define PCIE_MSI_SET_ENABLE_OFFSET 0x08
#define PCIE_MSI_SET_ADDR_HI_BASE 0xc80
#define PCIE_MSI_SET_ADDR_HI_OFFSET 0x04
#define PCIE_ICMD_PM_REG 0x198
#define PCIE_TURN_OFF_LINK BIT(4)
#define PCIE_MISC_CTRL_REG 0x348
#define PCIE_DISABLE_DVFSRC_VLT_REQ BIT(1)
#define PCIE_TRANS_TABLE_BASE_REG 0x800
#define PCIE_ATR_SRC_ADDR_MSB_OFFSET 0x4
#define PCIE_ATR_TRSL_ADDR_LSB_OFFSET 0x8
#define PCIE_ATR_TRSL_ADDR_MSB_OFFSET 0xc
#define PCIE_ATR_TRSL_PARAM_OFFSET 0x10
#define PCIE_ATR_TLB_SET_OFFSET 0x20
#define PCIE_MAX_TRANS_TABLES 8
#define PCIE_ATR_EN BIT(0)
#define PCIE_ATR_SIZE(size) \
(((((size) - 1) << 1) & GENMASK(6, 1)) | PCIE_ATR_EN)
#define PCIE_ATR_ID(id) ((id) & GENMASK(3, 0))
#define PCIE_ATR_TYPE_MEM PCIE_ATR_ID(0)
#define PCIE_ATR_TYPE_IO PCIE_ATR_ID(1)
#define PCIE_ATR_TLP_TYPE(type) (((type) << 16) & GENMASK(18, 16))
#define PCIE_ATR_TLP_TYPE_MEM PCIE_ATR_TLP_TYPE(0)
#define PCIE_ATR_TLP_TYPE_IO PCIE_ATR_TLP_TYPE(2)
/**
* struct mtk_msi_set - MSI information for each set
* @base: IO mapped register base
* @msg_addr: MSI message address
* @saved_irq_state: IRQ enable state saved at suspend time
*/
struct mtk_msi_set {
void __iomem *base;
phys_addr_t msg_addr;
u32 saved_irq_state;
};
/**
* struct mtk_gen3_pcie - PCIe port information
* @dev: pointer to PCIe device
* @base: IO mapped register base
* @reg_base: physical register base
* @mac_reset: MAC reset control
* @phy_reset: PHY reset control
* @phy: PHY controller block
* @clks: PCIe clocks
* @num_clks: PCIe clocks count for this port
* @irq: PCIe controller interrupt number
* @saved_irq_state: IRQ enable state saved at suspend time
* @irq_lock: lock protecting IRQ register access
* @intx_domain: legacy INTx IRQ domain
* @msi_domain: MSI IRQ domain
* @msi_bottom_domain: MSI IRQ bottom domain
* @msi_sets: MSI sets information
* @lock: lock protecting IRQ bit map
* @msi_irq_in_use: bit map for assigned MSI IRQ
*/
struct mtk_gen3_pcie {
struct device *dev;
void __iomem *base;
phys_addr_t reg_base;
struct reset_control *mac_reset;
struct reset_control *phy_reset;
struct phy *phy;
struct clk_bulk_data *clks;
int num_clks;
int irq;
u32 saved_irq_state;
raw_spinlock_t irq_lock;
struct irq_domain *intx_domain;
struct irq_domain *msi_domain;
struct irq_domain *msi_bottom_domain;
struct mtk_msi_set msi_sets[PCIE_MSI_SET_NUM];
struct mutex lock;
DECLARE_BITMAP(msi_irq_in_use, PCIE_MSI_IRQS_NUM);
};
/* LTSSM state in PCIE_LTSSM_STATUS_REG bit[28:24] */
static const char *const ltssm_str[] = {
"detect.quiet", /* 0x00 */
"detect.active", /* 0x01 */
"polling.active", /* 0x02 */
"polling.compliance", /* 0x03 */
"polling.configuration", /* 0x04 */
"config.linkwidthstart", /* 0x05 */
"config.linkwidthaccept", /* 0x06 */
"config.lanenumwait", /* 0x07 */
"config.lanenumaccept", /* 0x08 */
"config.complete", /* 0x09 */
"config.idle", /* 0x0A */
"recovery.receiverlock", /* 0x0B */
"recovery.equalization", /* 0x0C */
"recovery.speed", /* 0x0D */
"recovery.receiverconfig", /* 0x0E */
"recovery.idle", /* 0x0F */
"L0", /* 0x10 */
"L0s", /* 0x11 */
"L1.entry", /* 0x12 */
"L1.idle", /* 0x13 */
"L2.idle", /* 0x14 */
"L2.transmitwake", /* 0x15 */
"disable", /* 0x16 */
"loopback.entry", /* 0x17 */
"loopback.active", /* 0x18 */
"loopback.exit", /* 0x19 */
"hotreset", /* 0x1A */
};
/**
* mtk_pcie_config_tlp_header() - Configure a configuration TLP header
* @bus: PCI bus to query
* @devfn: device/function number
* @where: offset in config space
* @size: data size in TLP header
*
* Set byte enable field and device information in configuration TLP header.
*/
static void mtk_pcie_config_tlp_header(struct pci_bus *bus, unsigned int devfn,
int where, int size)
{
struct mtk_gen3_pcie *pcie = bus->sysdata;
int bytes;
u32 val;
bytes = (GENMASK(size - 1, 0) & 0xf) << (where & 0x3);
val = PCIE_CFG_FORCE_BYTE_EN | PCIE_CFG_BYTE_EN(bytes) |
PCIE_CFG_HEADER(bus->number, devfn);
writel_relaxed(val, pcie->base + PCIE_CFGNUM_REG);
}
static void __iomem *mtk_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
int where)
{
struct mtk_gen3_pcie *pcie = bus->sysdata;
return pcie->base + PCIE_CFG_OFFSET_ADDR + where;
}
static int mtk_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
mtk_pcie_config_tlp_header(bus, devfn, where, size);
return pci_generic_config_read32(bus, devfn, where, size, val);
}
static int mtk_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
mtk_pcie_config_tlp_header(bus, devfn, where, size);
if (size <= 2)
val <<= (where & 0x3) * 8;
return pci_generic_config_write32(bus, devfn, where, 4, val);
}
static struct pci_ops mtk_pcie_ops = {
.map_bus = mtk_pcie_map_bus,
.read = mtk_pcie_config_read,
.write = mtk_pcie_config_write,
};
static int mtk_pcie_set_trans_table(struct mtk_gen3_pcie *pcie,
resource_size_t cpu_addr,
resource_size_t pci_addr,
resource_size_t size,
unsigned long type, int num)
{
void __iomem *table;
u32 val;
if (num >= PCIE_MAX_TRANS_TABLES) {
dev_err(pcie->dev, "not enough translate table for addr: %#llx, limited to [%d]\n",
(unsigned long long)cpu_addr, PCIE_MAX_TRANS_TABLES);
return -ENODEV;
}
table = pcie->base + PCIE_TRANS_TABLE_BASE_REG +
num * PCIE_ATR_TLB_SET_OFFSET;
writel_relaxed(lower_32_bits(cpu_addr) | PCIE_ATR_SIZE(fls(size) - 1),
table);
writel_relaxed(upper_32_bits(cpu_addr),
table + PCIE_ATR_SRC_ADDR_MSB_OFFSET);
writel_relaxed(lower_32_bits(pci_addr),
table + PCIE_ATR_TRSL_ADDR_LSB_OFFSET);
writel_relaxed(upper_32_bits(pci_addr),
table + PCIE_ATR_TRSL_ADDR_MSB_OFFSET);
if (type == IORESOURCE_IO)
val = PCIE_ATR_TYPE_IO | PCIE_ATR_TLP_TYPE_IO;
else
val = PCIE_ATR_TYPE_MEM | PCIE_ATR_TLP_TYPE_MEM;
writel_relaxed(val, table + PCIE_ATR_TRSL_PARAM_OFFSET);
return 0;
}
static void mtk_pcie_enable_msi(struct mtk_gen3_pcie *pcie)
{
int i;
u32 val;
for (i = 0; i < PCIE_MSI_SET_NUM; i++) {
struct mtk_msi_set *msi_set = &pcie->msi_sets[i];
msi_set->base = pcie->base + PCIE_MSI_SET_BASE_REG +
i * PCIE_MSI_SET_OFFSET;
msi_set->msg_addr = pcie->reg_base + PCIE_MSI_SET_BASE_REG +
i * PCIE_MSI_SET_OFFSET;
/* Configure the MSI capture address */
writel_relaxed(lower_32_bits(msi_set->msg_addr), msi_set->base);
writel_relaxed(upper_32_bits(msi_set->msg_addr),
pcie->base + PCIE_MSI_SET_ADDR_HI_BASE +
i * PCIE_MSI_SET_ADDR_HI_OFFSET);
}
val = readl_relaxed(pcie->base + PCIE_MSI_SET_ENABLE_REG);
val |= PCIE_MSI_SET_ENABLE;
writel_relaxed(val, pcie->base + PCIE_MSI_SET_ENABLE_REG);
val = readl_relaxed(pcie->base + PCIE_INT_ENABLE_REG);
val |= PCIE_MSI_ENABLE;
writel_relaxed(val, pcie->base + PCIE_INT_ENABLE_REG);
}
static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie)
{
struct resource_entry *entry;
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
unsigned int table_index = 0;
int err;
u32 val;
/* Set as RC mode */
val = readl_relaxed(pcie->base + PCIE_SETTING_REG);
val |= PCIE_RC_MODE;
writel_relaxed(val, pcie->base + PCIE_SETTING_REG);
/* Set class code */
val = readl_relaxed(pcie->base + PCIE_PCI_IDS_1);
val &= ~GENMASK(31, 8);
val |= PCI_CLASS(PCI_CLASS_BRIDGE_PCI_NORMAL);
writel_relaxed(val, pcie->base + PCIE_PCI_IDS_1);
/* Mask all INTx interrupts */
val = readl_relaxed(pcie->base + PCIE_INT_ENABLE_REG);
val &= ~PCIE_INTX_ENABLE;
writel_relaxed(val, pcie->base + PCIE_INT_ENABLE_REG);
/* Disable DVFSRC voltage request */
val = readl_relaxed(pcie->base + PCIE_MISC_CTRL_REG);
val |= PCIE_DISABLE_DVFSRC_VLT_REQ;
writel_relaxed(val, pcie->base + PCIE_MISC_CTRL_REG);
/* Assert all reset signals */
val = readl_relaxed(pcie->base + PCIE_RST_CTRL_REG);
val |= PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB;
writel_relaxed(val, pcie->base + PCIE_RST_CTRL_REG);
/*
* Described in PCIe CEM specification sections 2.2 (PERST# Signal)
* and 2.2.1 (Initial Power-Up (G3 to S0)).
* The deassertion of PERST# should be delayed 100ms (TPVPERL)
* for the power and clock to become stable.
*/
msleep(100);
/* De-assert reset signals */
val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB);
writel_relaxed(val, pcie->base + PCIE_RST_CTRL_REG);
/* Check if the link is up or not */
err = readl_poll_timeout(pcie->base + PCIE_LINK_STATUS_REG, val,
!!(val & PCIE_PORT_LINKUP), 20,
PCI_PM_D3COLD_WAIT * USEC_PER_MSEC);
if (err) {
const char *ltssm_state;
int ltssm_index;
val = readl_relaxed(pcie->base + PCIE_LTSSM_STATUS_REG);
ltssm_index = PCIE_LTSSM_STATE(val);
ltssm_state = ltssm_index >= ARRAY_SIZE(ltssm_str) ?
"Unknown state" : ltssm_str[ltssm_index];
dev_err(pcie->dev,
"PCIe link down, current LTSSM state: %s (%#x)\n",
ltssm_state, val);
return err;
}
mtk_pcie_enable_msi(pcie);
/* Set PCIe translation windows */
resource_list_for_each_entry(entry, &host->windows) {
struct resource *res = entry->res;
unsigned long type = resource_type(res);
resource_size_t cpu_addr;
resource_size_t pci_addr;
resource_size_t size;
const char *range_type;
if (type == IORESOURCE_IO) {
cpu_addr = pci_pio_to_address(res->start);
range_type = "IO";
} else if (type == IORESOURCE_MEM) {
cpu_addr = res->start;
range_type = "MEM";
} else {
continue;
}
pci_addr = res->start - entry->offset;
size = resource_size(res);
err = mtk_pcie_set_trans_table(pcie, cpu_addr, pci_addr, size,
type, table_index);
if (err)
return err;
dev_dbg(pcie->dev, "set %s trans window[%d]: cpu_addr = %#llx, pci_addr = %#llx, size = %#llx\n",
range_type, table_index, (unsigned long long)cpu_addr,
(unsigned long long)pci_addr, (unsigned long long)size);
table_index++;
}
return 0;
}
static int mtk_pcie_set_affinity(struct irq_data *data,
const struct cpumask *mask, bool force)
{
return -EINVAL;
}
static void mtk_pcie_msi_irq_mask(struct irq_data *data)
{
pci_msi_mask_irq(data);
irq_chip_mask_parent(data);
}
static void mtk_pcie_msi_irq_unmask(struct irq_data *data)
{
pci_msi_unmask_irq(data);
irq_chip_unmask_parent(data);
}
static struct irq_chip mtk_msi_irq_chip = {
.irq_ack = irq_chip_ack_parent,
.irq_mask = mtk_pcie_msi_irq_mask,
.irq_unmask = mtk_pcie_msi_irq_unmask,
.name = "MSI",
};
static struct msi_domain_info mtk_msi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
.chip = &mtk_msi_irq_chip,
};
static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
{
struct mtk_msi_set *msi_set = irq_data_get_irq_chip_data(data);
struct mtk_gen3_pcie *pcie = data->domain->host_data;
unsigned long hwirq;
hwirq = data->hwirq % PCIE_MSI_IRQS_PER_SET;
msg->address_hi = upper_32_bits(msi_set->msg_addr);
msg->address_lo = lower_32_bits(msi_set->msg_addr);
msg->data = hwirq;
dev_dbg(pcie->dev, "msi#%#lx address_hi %#x address_lo %#x data %d\n",
hwirq, msg->address_hi, msg->address_lo, msg->data);
}
static void mtk_msi_bottom_irq_ack(struct irq_data *data)
{
struct mtk_msi_set *msi_set = irq_data_get_irq_chip_data(data);
unsigned long hwirq;
hwirq = data->hwirq % PCIE_MSI_IRQS_PER_SET;
writel_relaxed(BIT(hwirq), msi_set->base + PCIE_MSI_SET_STATUS_OFFSET);
}
static void mtk_msi_bottom_irq_mask(struct irq_data *data)
{
struct mtk_msi_set *msi_set = irq_data_get_irq_chip_data(data);
struct mtk_gen3_pcie *pcie = data->domain->host_data;
unsigned long hwirq, flags;
u32 val;
hwirq = data->hwirq % PCIE_MSI_IRQS_PER_SET;
raw_spin_lock_irqsave(&pcie->irq_lock, flags);
val = readl_relaxed(msi_set->base + PCIE_MSI_SET_ENABLE_OFFSET);
val &= ~BIT(hwirq);
writel_relaxed(val, msi_set->base + PCIE_MSI_SET_ENABLE_OFFSET);
raw_spin_unlock_irqrestore(&pcie->irq_lock, flags);
}
static void mtk_msi_bottom_irq_unmask(struct irq_data *data)
{
struct mtk_msi_set *msi_set = irq_data_get_irq_chip_data(data);
struct mtk_gen3_pcie *pcie = data->domain->host_data;
unsigned long hwirq, flags;
u32 val;
hwirq = data->hwirq % PCIE_MSI_IRQS_PER_SET;
raw_spin_lock_irqsave(&pcie->irq_lock, flags);
val = readl_relaxed(msi_set->base + PCIE_MSI_SET_ENABLE_OFFSET);
val |= BIT(hwirq);
writel_relaxed(val, msi_set->base + PCIE_MSI_SET_ENABLE_OFFSET);
raw_spin_unlock_irqrestore(&pcie->irq_lock, flags);
}
static struct irq_chip mtk_msi_bottom_irq_chip = {
.irq_ack = mtk_msi_bottom_irq_ack,
.irq_mask = mtk_msi_bottom_irq_mask,
.irq_unmask = mtk_msi_bottom_irq_unmask,
.irq_compose_msi_msg = mtk_compose_msi_msg,
.irq_set_affinity = mtk_pcie_set_affinity,
.name = "MSI",
};
static int mtk_msi_bottom_domain_alloc(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs,
void *arg)
{
struct mtk_gen3_pcie *pcie = domain->host_data;
struct mtk_msi_set *msi_set;
int i, hwirq, set_idx;
mutex_lock(&pcie->lock);
hwirq = bitmap_find_free_region(pcie->msi_irq_in_use, PCIE_MSI_IRQS_NUM,
order_base_2(nr_irqs));
mutex_unlock(&pcie->lock);
if (hwirq < 0)
return -ENOSPC;
set_idx = hwirq / PCIE_MSI_IRQS_PER_SET;
msi_set = &pcie->msi_sets[set_idx];
for (i = 0; i < nr_irqs; i++)
irq_domain_set_info(domain, virq + i, hwirq + i,
&mtk_msi_bottom_irq_chip, msi_set,
handle_edge_irq, NULL, NULL);
return 0;
}
static void mtk_msi_bottom_domain_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
struct mtk_gen3_pcie *pcie = domain->host_data;
struct irq_data *data = irq_domain_get_irq_data(domain, virq);
mutex_lock(&pcie->lock);
bitmap_release_region(pcie->msi_irq_in_use, data->hwirq,
order_base_2(nr_irqs));
mutex_unlock(&pcie->lock);
irq_domain_free_irqs_common(domain, virq, nr_irqs);
}
static const struct irq_domain_ops mtk_msi_bottom_domain_ops = {
.alloc = mtk_msi_bottom_domain_alloc,
.free = mtk_msi_bottom_domain_free,
};
static void mtk_intx_mask(struct irq_data *data)
{
struct mtk_gen3_pcie *pcie = irq_data_get_irq_chip_data(data);
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&pcie->irq_lock, flags);
val = readl_relaxed(pcie->base + PCIE_INT_ENABLE_REG);
val &= ~BIT(data->hwirq + PCIE_INTX_SHIFT);
writel_relaxed(val, pcie->base + PCIE_INT_ENABLE_REG);
raw_spin_unlock_irqrestore(&pcie->irq_lock, flags);
}
static void mtk_intx_unmask(struct irq_data *data)
{
struct mtk_gen3_pcie *pcie = irq_data_get_irq_chip_data(data);
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&pcie->irq_lock, flags);
val = readl_relaxed(pcie->base + PCIE_INT_ENABLE_REG);
val |= BIT(data->hwirq + PCIE_INTX_SHIFT);
writel_relaxed(val, pcie->base + PCIE_INT_ENABLE_REG);
raw_spin_unlock_irqrestore(&pcie->irq_lock, flags);
}
/**
* mtk_intx_eoi() - Clear INTx IRQ status at the end of interrupt
* @data: pointer to chip specific data
*
* As an emulated level IRQ, its interrupt status will remain
* until the corresponding de-assert message is received; hence that
* the status can only be cleared when the interrupt has been serviced.
*/
static void mtk_intx_eoi(struct irq_data *data)
{
struct mtk_gen3_pcie *pcie = irq_data_get_irq_chip_data(data);
unsigned long hwirq;
hwirq = data->hwirq + PCIE_INTX_SHIFT;
writel_relaxed(BIT(hwirq), pcie->base + PCIE_INT_STATUS_REG);
}
static struct irq_chip mtk_intx_irq_chip = {
.irq_mask = mtk_intx_mask,
.irq_unmask = mtk_intx_unmask,
.irq_eoi = mtk_intx_eoi,
.irq_set_affinity = mtk_pcie_set_affinity,
.name = "INTx",
};
static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_chip_data(irq, domain->host_data);
irq_set_chip_and_handler_name(irq, &mtk_intx_irq_chip,
handle_fasteoi_irq, "INTx");
return 0;
}
static const struct irq_domain_ops intx_domain_ops = {
.map = mtk_pcie_intx_map,
};
static int mtk_pcie_init_irq_domains(struct mtk_gen3_pcie *pcie)
{
struct device *dev = pcie->dev;
struct device_node *intc_node, *node = dev->of_node;
int ret;
raw_spin_lock_init(&pcie->irq_lock);
/* Setup INTx */
intc_node = of_get_child_by_name(node, "interrupt-controller");
if (!intc_node) {
dev_err(dev, "missing interrupt-controller node\n");
return -ENODEV;
}
pcie->intx_domain = irq_domain_add_linear(intc_node, PCI_NUM_INTX,
&intx_domain_ops, pcie);
if (!pcie->intx_domain) {
dev_err(dev, "failed to create INTx IRQ domain\n");
ret = -ENODEV;
goto out_put_node;
}
/* Setup MSI */
mutex_init(&pcie->lock);
pcie->msi_bottom_domain = irq_domain_add_linear(node, PCIE_MSI_IRQS_NUM,
&mtk_msi_bottom_domain_ops, pcie);
if (!pcie->msi_bottom_domain) {
dev_err(dev, "failed to create MSI bottom domain\n");
ret = -ENODEV;
goto err_msi_bottom_domain;
}
pcie->msi_domain = pci_msi_create_irq_domain(dev->fwnode,
&mtk_msi_domain_info,
pcie->msi_bottom_domain);
if (!pcie->msi_domain) {
dev_err(dev, "failed to create MSI domain\n");
ret = -ENODEV;
goto err_msi_domain;
}
of_node_put(intc_node);
return 0;
err_msi_domain:
irq_domain_remove(pcie->msi_bottom_domain);
err_msi_bottom_domain:
irq_domain_remove(pcie->intx_domain);
out_put_node:
of_node_put(intc_node);
return ret;
}
static void mtk_pcie_irq_teardown(struct mtk_gen3_pcie *pcie)
{
irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
if (pcie->intx_domain)
irq_domain_remove(pcie->intx_domain);
if (pcie->msi_domain)
irq_domain_remove(pcie->msi_domain);
if (pcie->msi_bottom_domain)
irq_domain_remove(pcie->msi_bottom_domain);
irq_dispose_mapping(pcie->irq);
}
static void mtk_pcie_msi_handler(struct mtk_gen3_pcie *pcie, int set_idx)
{
struct mtk_msi_set *msi_set = &pcie->msi_sets[set_idx];
unsigned long msi_enable, msi_status;
irq_hw_number_t bit, hwirq;
msi_enable = readl_relaxed(msi_set->base + PCIE_MSI_SET_ENABLE_OFFSET);
do {
msi_status = readl_relaxed(msi_set->base +
PCIE_MSI_SET_STATUS_OFFSET);
msi_status &= msi_enable;
if (!msi_status)
break;
for_each_set_bit(bit, &msi_status, PCIE_MSI_IRQS_PER_SET) {
hwirq = bit + set_idx * PCIE_MSI_IRQS_PER_SET;
generic_handle_domain_irq(pcie->msi_bottom_domain, hwirq);
}
} while (true);
}
static void mtk_pcie_irq_handler(struct irq_desc *desc)
{
struct mtk_gen3_pcie *pcie = irq_desc_get_handler_data(desc);
struct irq_chip *irqchip = irq_desc_get_chip(desc);
unsigned long status;
irq_hw_number_t irq_bit = PCIE_INTX_SHIFT;
chained_irq_enter(irqchip, desc);
status = readl_relaxed(pcie->base + PCIE_INT_STATUS_REG);
for_each_set_bit_from(irq_bit, &status, PCI_NUM_INTX +
PCIE_INTX_SHIFT)
generic_handle_domain_irq(pcie->intx_domain,
irq_bit - PCIE_INTX_SHIFT);
irq_bit = PCIE_MSI_SHIFT;
for_each_set_bit_from(irq_bit, &status, PCIE_MSI_SET_NUM +
PCIE_MSI_SHIFT) {
mtk_pcie_msi_handler(pcie, irq_bit - PCIE_MSI_SHIFT);
writel_relaxed(BIT(irq_bit), pcie->base + PCIE_INT_STATUS_REG);
}
chained_irq_exit(irqchip, desc);
}
static int mtk_pcie_setup_irq(struct mtk_gen3_pcie *pcie)
{
struct device *dev = pcie->dev;
struct platform_device *pdev = to_platform_device(dev);
int err;
err = mtk_pcie_init_irq_domains(pcie);
if (err)
return err;
pcie->irq = platform_get_irq(pdev, 0);
if (pcie->irq < 0)
return pcie->irq;
irq_set_chained_handler_and_data(pcie->irq, mtk_pcie_irq_handler, pcie);
return 0;
}
static int mtk_pcie_parse_port(struct mtk_gen3_pcie *pcie)
{
struct device *dev = pcie->dev;
struct platform_device *pdev = to_platform_device(dev);
struct resource *regs;
int ret;
regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcie-mac");
if (!regs)
return -EINVAL;
pcie->base = devm_ioremap_resource(dev, regs);
if (IS_ERR(pcie->base)) {
dev_err(dev, "failed to map register base\n");
return PTR_ERR(pcie->base);
}
pcie->reg_base = regs->start;
pcie->phy_reset = devm_reset_control_get_optional_exclusive(dev, "phy");
if (IS_ERR(pcie->phy_reset)) {
ret = PTR_ERR(pcie->phy_reset);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to get PHY reset\n");
return ret;
}
pcie->mac_reset = devm_reset_control_get_optional_exclusive(dev, "mac");
if (IS_ERR(pcie->mac_reset)) {
ret = PTR_ERR(pcie->mac_reset);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to get MAC reset\n");
return ret;
}
pcie->phy = devm_phy_optional_get(dev, "pcie-phy");
if (IS_ERR(pcie->phy)) {
ret = PTR_ERR(pcie->phy);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to get PHY\n");
return ret;
}
pcie->num_clks = devm_clk_bulk_get_all(dev, &pcie->clks);
if (pcie->num_clks < 0) {
dev_err(dev, "failed to get clocks\n");
return pcie->num_clks;
}
return 0;
}
static int mtk_pcie_power_up(struct mtk_gen3_pcie *pcie)
{
struct device *dev = pcie->dev;
int err;
/* PHY power on and enable pipe clock */
reset_control_deassert(pcie->phy_reset);
err = phy_init(pcie->phy);
if (err) {
dev_err(dev, "failed to initialize PHY\n");
goto err_phy_init;
}
err = phy_power_on(pcie->phy);
if (err) {
dev_err(dev, "failed to power on PHY\n");
goto err_phy_on;
}
/* MAC power on and enable transaction layer clocks */
reset_control_deassert(pcie->mac_reset);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
err = clk_bulk_prepare_enable(pcie->num_clks, pcie->clks);
if (err) {
dev_err(dev, "failed to enable clocks\n");
goto err_clk_init;
}
return 0;
err_clk_init:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
reset_control_assert(pcie->mac_reset);
phy_power_off(pcie->phy);
err_phy_on:
phy_exit(pcie->phy);
err_phy_init:
reset_control_assert(pcie->phy_reset);
return err;
}
static void mtk_pcie_power_down(struct mtk_gen3_pcie *pcie)
{
clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
pm_runtime_put_sync(pcie->dev);
pm_runtime_disable(pcie->dev);
reset_control_assert(pcie->mac_reset);
phy_power_off(pcie->phy);
phy_exit(pcie->phy);
reset_control_assert(pcie->phy_reset);
}
static int mtk_pcie_setup(struct mtk_gen3_pcie *pcie)
{
int err;
err = mtk_pcie_parse_port(pcie);
if (err)
return err;
/*
* The controller may have been left out of reset by the bootloader
* so make sure that we get a clean start by asserting resets here.
*/
reset_control_assert(pcie->phy_reset);
reset_control_assert(pcie->mac_reset);
usleep_range(10, 20);
/* Don't touch the hardware registers before power up */
err = mtk_pcie_power_up(pcie);
if (err)
return err;
/* Try link up */
err = mtk_pcie_startup_port(pcie);
if (err)
goto err_setup;
err = mtk_pcie_setup_irq(pcie);
if (err)
goto err_setup;
return 0;
err_setup:
mtk_pcie_power_down(pcie);
return err;
}
static int mtk_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_gen3_pcie *pcie;
struct pci_host_bridge *host;
int err;
host = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
if (!host)
return -ENOMEM;
pcie = pci_host_bridge_priv(host);
pcie->dev = dev;
platform_set_drvdata(pdev, pcie);
err = mtk_pcie_setup(pcie);
if (err)
return err;
host->ops = &mtk_pcie_ops;
host->sysdata = pcie;
err = pci_host_probe(host);
if (err) {
mtk_pcie_irq_teardown(pcie);
mtk_pcie_power_down(pcie);
return err;
}
return 0;
}
static int mtk_pcie_remove(struct platform_device *pdev)
{
struct mtk_gen3_pcie *pcie = platform_get_drvdata(pdev);
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
pci_lock_rescan_remove();
pci_stop_root_bus(host->bus);
pci_remove_root_bus(host->bus);
pci_unlock_rescan_remove();
mtk_pcie_irq_teardown(pcie);
mtk_pcie_power_down(pcie);
return 0;
}
static void mtk_pcie_irq_save(struct mtk_gen3_pcie *pcie)
{
int i;
raw_spin_lock(&pcie->irq_lock);
pcie->saved_irq_state = readl_relaxed(pcie->base + PCIE_INT_ENABLE_REG);
for (i = 0; i < PCIE_MSI_SET_NUM; i++) {
struct mtk_msi_set *msi_set = &pcie->msi_sets[i];
msi_set->saved_irq_state = readl_relaxed(msi_set->base +
PCIE_MSI_SET_ENABLE_OFFSET);
}
raw_spin_unlock(&pcie->irq_lock);
}
static void mtk_pcie_irq_restore(struct mtk_gen3_pcie *pcie)
{
int i;
raw_spin_lock(&pcie->irq_lock);
writel_relaxed(pcie->saved_irq_state, pcie->base + PCIE_INT_ENABLE_REG);
for (i = 0; i < PCIE_MSI_SET_NUM; i++) {
struct mtk_msi_set *msi_set = &pcie->msi_sets[i];
writel_relaxed(msi_set->saved_irq_state,
msi_set->base + PCIE_MSI_SET_ENABLE_OFFSET);
}
raw_spin_unlock(&pcie->irq_lock);
}
static int mtk_pcie_turn_off_link(struct mtk_gen3_pcie *pcie)
{
u32 val;
val = readl_relaxed(pcie->base + PCIE_ICMD_PM_REG);
val |= PCIE_TURN_OFF_LINK;
writel_relaxed(val, pcie->base + PCIE_ICMD_PM_REG);
/* Check the link is L2 */
return readl_poll_timeout(pcie->base + PCIE_LTSSM_STATUS_REG, val,
(PCIE_LTSSM_STATE(val) ==
PCIE_LTSSM_STATE_L2_IDLE), 20,
50 * USEC_PER_MSEC);
}
static int mtk_pcie_suspend_noirq(struct device *dev)
{
struct mtk_gen3_pcie *pcie = dev_get_drvdata(dev);
int err;
u32 val;
/* Trigger link to L2 state */
err = mtk_pcie_turn_off_link(pcie);
if (err) {
dev_err(pcie->dev, "cannot enter L2 state\n");
return err;
}
/* Pull down the PERST# pin */
val = readl_relaxed(pcie->base + PCIE_RST_CTRL_REG);
val |= PCIE_PE_RSTB;
writel_relaxed(val, pcie->base + PCIE_RST_CTRL_REG);
dev_dbg(pcie->dev, "entered L2 states successfully");
mtk_pcie_irq_save(pcie);
mtk_pcie_power_down(pcie);
return 0;
}
static int mtk_pcie_resume_noirq(struct device *dev)
{
struct mtk_gen3_pcie *pcie = dev_get_drvdata(dev);
int err;
err = mtk_pcie_power_up(pcie);
if (err)
return err;
err = mtk_pcie_startup_port(pcie);
if (err) {
mtk_pcie_power_down(pcie);
return err;
}
mtk_pcie_irq_restore(pcie);
return 0;
}
static const struct dev_pm_ops mtk_pcie_pm_ops = {
NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq,
mtk_pcie_resume_noirq)
};
static const struct of_device_id mtk_pcie_of_match[] = {
{ .compatible = "mediatek,mt8192-pcie" },
{},
};
MODULE_DEVICE_TABLE(of, mtk_pcie_of_match);
static struct platform_driver mtk_pcie_driver = {
.probe = mtk_pcie_probe,
.remove = mtk_pcie_remove,
.driver = {
.name = "mtk-pcie-gen3",
.of_match_table = mtk_pcie_of_match,
.pm = &mtk_pcie_pm_ops,
},
};
module_platform_driver(mtk_pcie_driver);
MODULE_LICENSE("GPL v2");