linux/drivers/pci/controller/pcie-mediatek.c
Jeff Johnson 142a41da39
PCI: controller: Add missing MODULE_DESCRIPTION() macros
When ARCH=x86, make allmodconfig && make W=1 C=1 reports:

  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/dwc/pci-exynos.o
  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/pci-host-generic.o
  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/pcie-altera.o
  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/pcie-altera-msi.o
  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/pcie-mediatek.o
  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/pcie-mediatek-gen3.o
  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/vmd.o
  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/pcie-apple.o
  WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pci/controller/pcie-mt7621.o

Add the missing MODULE_DESCRIPTION() macro.

[kwilczynski: update MODULE_DESCRIPTION() text, commit log]
Link: https://lore.kernel.org/linux-pci/20240626-md-drivers-pci-controller-v2-1-94c811db7a51@quicinc.com
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Nirmal Patel <nirmal.patel@linux.intel.com>
Acked-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> # MT7621
2024-07-08 08:36:14 +00:00

1257 lines
33 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* MediaTek PCIe host controller driver.
*
* Copyright (c) 2017 MediaTek Inc.
* Author: Ryder Lee <ryder.lee@mediatek.com>
* Honghui Zhang <honghui.zhang@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/mfd/syscon.h>
#include <linux/msi.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include "../pci.h"
/* PCIe shared registers */
#define PCIE_SYS_CFG 0x00
#define PCIE_INT_ENABLE 0x0c
#define PCIE_CFG_ADDR 0x20
#define PCIE_CFG_DATA 0x24
/* PCIe per port registers */
#define PCIE_BAR0_SETUP 0x10
#define PCIE_CLASS 0x34
#define PCIE_LINK_STATUS 0x50
#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
#define PCIE_PORT_PERST(x) BIT(1 + (x))
#define PCIE_PORT_LINKUP BIT(0)
#define PCIE_BAR_MAP_MAX GENMASK(31, 16)
#define PCIE_BAR_ENABLE BIT(0)
#define PCIE_REVISION_ID BIT(0)
#define PCIE_CLASS_CODE (0x60400 << 8)
#define PCIE_CONF_REG(regn) (((regn) & GENMASK(7, 2)) | \
((((regn) >> 8) & GENMASK(3, 0)) << 24))
#define PCIE_CONF_FUN(fun) (((fun) << 8) & GENMASK(10, 8))
#define PCIE_CONF_DEV(dev) (((dev) << 11) & GENMASK(15, 11))
#define PCIE_CONF_BUS(bus) (((bus) << 16) & GENMASK(23, 16))
#define PCIE_CONF_ADDR(regn, fun, dev, bus) \
(PCIE_CONF_REG(regn) | PCIE_CONF_FUN(fun) | \
PCIE_CONF_DEV(dev) | PCIE_CONF_BUS(bus))
/* MediaTek specific configuration registers */
#define PCIE_FTS_NUM 0x70c
#define PCIE_FTS_NUM_MASK GENMASK(15, 8)
#define PCIE_FTS_NUM_L0(x) ((x) & 0xff << 8)
#define PCIE_FC_CREDIT 0x73c
#define PCIE_FC_CREDIT_MASK (GENMASK(31, 31) | GENMASK(28, 16))
#define PCIE_FC_CREDIT_VAL(x) ((x) << 16)
/* PCIe V2 share registers */
#define PCIE_SYS_CFG_V2 0x0
#define PCIE_CSR_LTSSM_EN(x) BIT(0 + (x) * 8)
#define PCIE_CSR_ASPM_L1_EN(x) BIT(1 + (x) * 8)
/* PCIe V2 per-port registers */
#define PCIE_MSI_VECTOR 0x0c0
#define PCIE_CONF_VEND_ID 0x100
#define PCIE_CONF_DEVICE_ID 0x102
#define PCIE_CONF_CLASS_ID 0x106
#define PCIE_INT_MASK 0x420
#define INTX_MASK GENMASK(19, 16)
#define INTX_SHIFT 16
#define PCIE_INT_STATUS 0x424
#define MSI_STATUS BIT(23)
#define PCIE_IMSI_STATUS 0x42c
#define PCIE_IMSI_ADDR 0x430
#define MSI_MASK BIT(23)
#define MTK_MSI_IRQS_NUM 32
#define PCIE_AHB_TRANS_BASE0_L 0x438
#define PCIE_AHB_TRANS_BASE0_H 0x43c
#define AHB2PCIE_SIZE(x) ((x) & GENMASK(4, 0))
#define PCIE_AXI_WINDOW0 0x448
#define WIN_ENABLE BIT(7)
/*
* Define PCIe to AHB window size as 2^33 to support max 8GB address space
* translate, support least 4GB DRAM size access from EP DMA(physical DRAM
* start from 0x40000000).
*/
#define PCIE2AHB_SIZE 0x21
/* PCIe V2 configuration transaction header */
#define PCIE_CFG_HEADER0 0x460
#define PCIE_CFG_HEADER1 0x464
#define PCIE_CFG_HEADER2 0x468
#define PCIE_CFG_WDATA 0x470
#define PCIE_APP_TLP_REQ 0x488
#define PCIE_CFG_RDATA 0x48c
#define APP_CFG_REQ BIT(0)
#define APP_CPL_STATUS GENMASK(7, 5)
#define CFG_WRRD_TYPE_0 4
#define CFG_WR_FMT 2
#define CFG_RD_FMT 0
#define CFG_DW0_LENGTH(length) ((length) & GENMASK(9, 0))
#define CFG_DW0_TYPE(type) (((type) << 24) & GENMASK(28, 24))
#define CFG_DW0_FMT(fmt) (((fmt) << 29) & GENMASK(31, 29))
#define CFG_DW2_REGN(regn) ((regn) & GENMASK(11, 2))
#define CFG_DW2_FUN(fun) (((fun) << 16) & GENMASK(18, 16))
#define CFG_DW2_DEV(dev) (((dev) << 19) & GENMASK(23, 19))
#define CFG_DW2_BUS(bus) (((bus) << 24) & GENMASK(31, 24))
#define CFG_HEADER_DW0(type, fmt) \
(CFG_DW0_LENGTH(1) | CFG_DW0_TYPE(type) | CFG_DW0_FMT(fmt))
#define CFG_HEADER_DW1(where, size) \
(GENMASK(((size) - 1), 0) << ((where) & 0x3))
#define CFG_HEADER_DW2(regn, fun, dev, bus) \
(CFG_DW2_REGN(regn) | CFG_DW2_FUN(fun) | \
CFG_DW2_DEV(dev) | CFG_DW2_BUS(bus))
#define PCIE_RST_CTRL 0x510
#define PCIE_PHY_RSTB BIT(0)
#define PCIE_PIPE_SRSTB BIT(1)
#define PCIE_MAC_SRSTB BIT(2)
#define PCIE_CRSTB BIT(3)
#define PCIE_PERSTB BIT(8)
#define PCIE_LINKDOWN_RST_EN GENMASK(15, 13)
#define PCIE_LINK_STATUS_V2 0x804
#define PCIE_PORT_LINKUP_V2 BIT(10)
struct mtk_pcie_port;
/**
* struct mtk_pcie_soc - differentiate between host generations
* @need_fix_class_id: whether this host's class ID needed to be fixed or not
* @need_fix_device_id: whether this host's device ID needed to be fixed or not
* @no_msi: Bridge has no MSI support, and relies on an external block
* @device_id: device ID which this host need to be fixed
* @ops: pointer to configuration access functions
* @startup: pointer to controller setting functions
* @setup_irq: pointer to initialize IRQ functions
*/
struct mtk_pcie_soc {
bool need_fix_class_id;
bool need_fix_device_id;
bool no_msi;
unsigned int device_id;
struct pci_ops *ops;
int (*startup)(struct mtk_pcie_port *port);
int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node);
};
/**
* struct mtk_pcie_port - PCIe port information
* @base: IO mapped register base
* @list: port list
* @pcie: pointer to PCIe host info
* @reset: pointer to port reset control
* @sys_ck: pointer to transaction/data link layer clock
* @ahb_ck: pointer to AHB slave interface operating clock for CSR access
* and RC initiated MMIO access
* @axi_ck: pointer to application layer MMIO channel operating clock
* @aux_ck: pointer to pe2_mac_bridge and pe2_mac_core operating clock
* when pcie_mac_ck/pcie_pipe_ck is turned off
* @obff_ck: pointer to OBFF functional block operating clock
* @pipe_ck: pointer to LTSSM and PHY/MAC layer operating clock
* @phy: pointer to PHY control block
* @slot: port slot
* @irq: GIC irq
* @irq_domain: legacy INTx IRQ domain
* @inner_domain: inner IRQ domain
* @msi_domain: MSI IRQ domain
* @lock: protect the msi_irq_in_use bitmap
* @msi_irq_in_use: bit map for assigned MSI IRQ
*/
struct mtk_pcie_port {
void __iomem *base;
struct list_head list;
struct mtk_pcie *pcie;
struct reset_control *reset;
struct clk *sys_ck;
struct clk *ahb_ck;
struct clk *axi_ck;
struct clk *aux_ck;
struct clk *obff_ck;
struct clk *pipe_ck;
struct phy *phy;
u32 slot;
int irq;
struct irq_domain *irq_domain;
struct irq_domain *inner_domain;
struct irq_domain *msi_domain;
struct mutex lock;
DECLARE_BITMAP(msi_irq_in_use, MTK_MSI_IRQS_NUM);
};
/**
* struct mtk_pcie - PCIe host information
* @dev: pointer to PCIe device
* @base: IO mapped register base
* @cfg: IO mapped register map for PCIe config
* @free_ck: free-run reference clock
* @mem: non-prefetchable memory resource
* @ports: pointer to PCIe port information
* @soc: pointer to SoC-dependent operations
*/
struct mtk_pcie {
struct device *dev;
void __iomem *base;
struct regmap *cfg;
struct clk *free_ck;
struct list_head ports;
const struct mtk_pcie_soc *soc;
};
static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie)
{
struct device *dev = pcie->dev;
clk_disable_unprepare(pcie->free_ck);
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
}
static void mtk_pcie_port_free(struct mtk_pcie_port *port)
{
struct mtk_pcie *pcie = port->pcie;
struct device *dev = pcie->dev;
devm_iounmap(dev, port->base);
list_del(&port->list);
devm_kfree(dev, port);
}
static void mtk_pcie_put_resources(struct mtk_pcie *pcie)
{
struct mtk_pcie_port *port, *tmp;
list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
phy_power_off(port->phy);
phy_exit(port->phy);
clk_disable_unprepare(port->pipe_ck);
clk_disable_unprepare(port->obff_ck);
clk_disable_unprepare(port->axi_ck);
clk_disable_unprepare(port->aux_ck);
clk_disable_unprepare(port->ahb_ck);
clk_disable_unprepare(port->sys_ck);
mtk_pcie_port_free(port);
}
mtk_pcie_subsys_powerdown(pcie);
}
static int mtk_pcie_check_cfg_cpld(struct mtk_pcie_port *port)
{
u32 val;
int err;
err = readl_poll_timeout_atomic(port->base + PCIE_APP_TLP_REQ, val,
!(val & APP_CFG_REQ), 10,
100 * USEC_PER_MSEC);
if (err)
return PCIBIOS_SET_FAILED;
if (readl(port->base + PCIE_APP_TLP_REQ) & APP_CPL_STATUS)
return PCIBIOS_SET_FAILED;
return PCIBIOS_SUCCESSFUL;
}
static int mtk_pcie_hw_rd_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
int where, int size, u32 *val)
{
u32 tmp;
/* Write PCIe configuration transaction header for Cfgrd */
writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_RD_FMT),
port->base + PCIE_CFG_HEADER0);
writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_SLOT(devfn), bus),
port->base + PCIE_CFG_HEADER2);
/* Trigger h/w to transmit Cfgrd TLP */
tmp = readl(port->base + PCIE_APP_TLP_REQ);
tmp |= APP_CFG_REQ;
writel(tmp, port->base + PCIE_APP_TLP_REQ);
/* Check completion status */
if (mtk_pcie_check_cfg_cpld(port))
return PCIBIOS_SET_FAILED;
/* Read cpld payload of Cfgrd */
*val = readl(port->base + PCIE_CFG_RDATA);
if (size == 1)
*val = (*val >> (8 * (where & 3))) & 0xff;
else if (size == 2)
*val = (*val >> (8 * (where & 3))) & 0xffff;
return PCIBIOS_SUCCESSFUL;
}
static int mtk_pcie_hw_wr_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
int where, int size, u32 val)
{
/* Write PCIe configuration transaction header for Cfgwr */
writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_WR_FMT),
port->base + PCIE_CFG_HEADER0);
writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_SLOT(devfn), bus),
port->base + PCIE_CFG_HEADER2);
/* Write Cfgwr data */
val = val << 8 * (where & 3);
writel(val, port->base + PCIE_CFG_WDATA);
/* Trigger h/w to transmit Cfgwr TLP */
val = readl(port->base + PCIE_APP_TLP_REQ);
val |= APP_CFG_REQ;
writel(val, port->base + PCIE_APP_TLP_REQ);
/* Check completion status */
return mtk_pcie_check_cfg_cpld(port);
}
static struct mtk_pcie_port *mtk_pcie_find_port(struct pci_bus *bus,
unsigned int devfn)
{
struct mtk_pcie *pcie = bus->sysdata;
struct mtk_pcie_port *port;
struct pci_dev *dev = NULL;
/*
* Walk the bus hierarchy to get the devfn value
* of the port in the root bus.
*/
while (bus && bus->number) {
dev = bus->self;
bus = dev->bus;
devfn = dev->devfn;
}
list_for_each_entry(port, &pcie->ports, list)
if (port->slot == PCI_SLOT(devfn))
return port;
return NULL;
}
static int mtk_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
struct mtk_pcie_port *port;
u32 bn = bus->number;
port = mtk_pcie_find_port(bus, devfn);
if (!port)
return PCIBIOS_DEVICE_NOT_FOUND;
return mtk_pcie_hw_rd_cfg(port, bn, devfn, where, size, val);
}
static int mtk_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
struct mtk_pcie_port *port;
u32 bn = bus->number;
port = mtk_pcie_find_port(bus, devfn);
if (!port)
return PCIBIOS_DEVICE_NOT_FOUND;
return mtk_pcie_hw_wr_cfg(port, bn, devfn, where, size, val);
}
static struct pci_ops mtk_pcie_ops_v2 = {
.read = mtk_pcie_config_read,
.write = mtk_pcie_config_write,
};
static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
{
struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
phys_addr_t addr;
/* MT2712/MT7622 only support 32-bit MSI addresses */
addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
msg->address_hi = 0;
msg->address_lo = lower_32_bits(addr);
msg->data = data->hwirq;
dev_dbg(port->pcie->dev, "msi#%d address_hi %#x address_lo %#x\n",
(int)data->hwirq, msg->address_hi, msg->address_lo);
}
static int mtk_msi_set_affinity(struct irq_data *irq_data,
const struct cpumask *mask, bool force)
{
return -EINVAL;
}
static void mtk_msi_ack_irq(struct irq_data *data)
{
struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
u32 hwirq = data->hwirq;
writel(1 << hwirq, port->base + PCIE_IMSI_STATUS);
}
static struct irq_chip mtk_msi_bottom_irq_chip = {
.name = "MTK MSI",
.irq_compose_msi_msg = mtk_compose_msi_msg,
.irq_set_affinity = mtk_msi_set_affinity,
.irq_ack = mtk_msi_ack_irq,
};
static int mtk_pcie_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *args)
{
struct mtk_pcie_port *port = domain->host_data;
unsigned long bit;
WARN_ON(nr_irqs != 1);
mutex_lock(&port->lock);
bit = find_first_zero_bit(port->msi_irq_in_use, MTK_MSI_IRQS_NUM);
if (bit >= MTK_MSI_IRQS_NUM) {
mutex_unlock(&port->lock);
return -ENOSPC;
}
__set_bit(bit, port->msi_irq_in_use);
mutex_unlock(&port->lock);
irq_domain_set_info(domain, virq, bit, &mtk_msi_bottom_irq_chip,
domain->host_data, handle_edge_irq,
NULL, NULL);
return 0;
}
static void mtk_pcie_irq_domain_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
struct mtk_pcie_port *port = irq_data_get_irq_chip_data(d);
mutex_lock(&port->lock);
if (!test_bit(d->hwirq, port->msi_irq_in_use))
dev_err(port->pcie->dev, "trying to free unused MSI#%lu\n",
d->hwirq);
else
__clear_bit(d->hwirq, port->msi_irq_in_use);
mutex_unlock(&port->lock);
irq_domain_free_irqs_parent(domain, virq, nr_irqs);
}
static const struct irq_domain_ops msi_domain_ops = {
.alloc = mtk_pcie_irq_domain_alloc,
.free = mtk_pcie_irq_domain_free,
};
static struct irq_chip mtk_msi_irq_chip = {
.name = "MTK PCIe MSI",
.irq_ack = irq_chip_ack_parent,
.irq_mask = pci_msi_mask_irq,
.irq_unmask = pci_msi_unmask_irq,
};
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),
.chip = &mtk_msi_irq_chip,
};
static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
{
struct fwnode_handle *fwnode = of_node_to_fwnode(port->pcie->dev->of_node);
mutex_init(&port->lock);
port->inner_domain = irq_domain_create_linear(fwnode, MTK_MSI_IRQS_NUM,
&msi_domain_ops, port);
if (!port->inner_domain) {
dev_err(port->pcie->dev, "failed to create IRQ domain\n");
return -ENOMEM;
}
port->msi_domain = pci_msi_create_irq_domain(fwnode, &mtk_msi_domain_info,
port->inner_domain);
if (!port->msi_domain) {
dev_err(port->pcie->dev, "failed to create MSI domain\n");
irq_domain_remove(port->inner_domain);
return -ENOMEM;
}
return 0;
}
static void mtk_pcie_enable_msi(struct mtk_pcie_port *port)
{
u32 val;
phys_addr_t msg_addr;
msg_addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
val = lower_32_bits(msg_addr);
writel(val, port->base + PCIE_IMSI_ADDR);
val = readl(port->base + PCIE_INT_MASK);
val &= ~MSI_MASK;
writel(val, port->base + PCIE_INT_MASK);
}
static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
{
struct mtk_pcie_port *port, *tmp;
list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
irq_set_chained_handler_and_data(port->irq, NULL, NULL);
if (port->irq_domain)
irq_domain_remove(port->irq_domain);
if (IS_ENABLED(CONFIG_PCI_MSI)) {
if (port->msi_domain)
irq_domain_remove(port->msi_domain);
if (port->inner_domain)
irq_domain_remove(port->inner_domain);
}
irq_dispose_mapping(port->irq);
}
}
static int mtk_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 = mtk_pcie_intx_map,
};
static int mtk_pcie_init_irq_domain(struct mtk_pcie_port *port,
struct device_node *node)
{
struct device *dev = port->pcie->dev;
struct device_node *pcie_intc_node;
int ret;
/* Setup INTx */
pcie_intc_node = of_get_next_child(node, NULL);
if (!pcie_intc_node) {
dev_err(dev, "no PCIe Intc node found\n");
return -ENODEV;
}
port->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
&intx_domain_ops, port);
of_node_put(pcie_intc_node);
if (!port->irq_domain) {
dev_err(dev, "failed to get INTx IRQ domain\n");
return -ENODEV;
}
if (IS_ENABLED(CONFIG_PCI_MSI)) {
ret = mtk_pcie_allocate_msi_domains(port);
if (ret)
return ret;
}
return 0;
}
static void mtk_pcie_intr_handler(struct irq_desc *desc)
{
struct mtk_pcie_port *port = irq_desc_get_handler_data(desc);
struct irq_chip *irqchip = irq_desc_get_chip(desc);
unsigned long status;
u32 bit = INTX_SHIFT;
chained_irq_enter(irqchip, desc);
status = readl(port->base + PCIE_INT_STATUS);
if (status & INTX_MASK) {
for_each_set_bit_from(bit, &status, PCI_NUM_INTX + INTX_SHIFT) {
/* Clear the INTx */
writel(1 << bit, port->base + PCIE_INT_STATUS);
generic_handle_domain_irq(port->irq_domain,
bit - INTX_SHIFT);
}
}
if (IS_ENABLED(CONFIG_PCI_MSI)) {
if (status & MSI_STATUS){
unsigned long imsi_status;
/*
* The interrupt status can be cleared even if the
* MSI status remains pending. As such, given the
* edge-triggered interrupt type, its status should
* be cleared before being dispatched to the
* handler of the underlying device.
*/
writel(MSI_STATUS, port->base + PCIE_INT_STATUS);
while ((imsi_status = readl(port->base + PCIE_IMSI_STATUS))) {
for_each_set_bit(bit, &imsi_status, MTK_MSI_IRQS_NUM)
generic_handle_domain_irq(port->inner_domain, bit);
}
}
}
chained_irq_exit(irqchip, desc);
}
static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
struct device_node *node)
{
struct mtk_pcie *pcie = port->pcie;
struct device *dev = pcie->dev;
struct platform_device *pdev = to_platform_device(dev);
int err;
err = mtk_pcie_init_irq_domain(port, node);
if (err) {
dev_err(dev, "failed to init PCIe IRQ domain\n");
return err;
}
if (of_property_present(dev->of_node, "interrupt-names"))
port->irq = platform_get_irq_byname(pdev, "pcie_irq");
else
port->irq = platform_get_irq(pdev, port->slot);
if (port->irq < 0)
return port->irq;
irq_set_chained_handler_and_data(port->irq,
mtk_pcie_intr_handler, port);
return 0;
}
static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
{
struct mtk_pcie *pcie = port->pcie;
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
struct resource *mem = NULL;
struct resource_entry *entry;
const struct mtk_pcie_soc *soc = port->pcie->soc;
u32 val;
int err;
entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
if (entry)
mem = entry->res;
if (!mem)
return -EINVAL;
/* MT7622 platforms need to enable LTSSM and ASPM from PCIe subsys */
if (pcie->base) {
val = readl(pcie->base + PCIE_SYS_CFG_V2);
val |= PCIE_CSR_LTSSM_EN(port->slot) |
PCIE_CSR_ASPM_L1_EN(port->slot);
writel(val, pcie->base + PCIE_SYS_CFG_V2);
} else if (pcie->cfg) {
val = PCIE_CSR_LTSSM_EN(port->slot) |
PCIE_CSR_ASPM_L1_EN(port->slot);
regmap_update_bits(pcie->cfg, PCIE_SYS_CFG_V2, val, val);
}
/* Assert all reset signals */
writel(0, port->base + PCIE_RST_CTRL);
/*
* Enable PCIe link down reset, if link status changed from link up to
* link down, this will reset MAC control registers and configuration
* space.
*/
writel(PCIE_LINKDOWN_RST_EN, port->base + PCIE_RST_CTRL);
/*
* 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 PHY, PE, PIPE, MAC and configuration reset */
val = readl(port->base + PCIE_RST_CTRL);
val |= PCIE_PHY_RSTB | PCIE_PERSTB | PCIE_PIPE_SRSTB |
PCIE_MAC_SRSTB | PCIE_CRSTB;
writel(val, port->base + PCIE_RST_CTRL);
/* Set up vendor ID and class code */
if (soc->need_fix_class_id) {
val = PCI_VENDOR_ID_MEDIATEK;
writew(val, port->base + PCIE_CONF_VEND_ID);
val = PCI_CLASS_BRIDGE_PCI;
writew(val, port->base + PCIE_CONF_CLASS_ID);
}
if (soc->need_fix_device_id)
writew(soc->device_id, port->base + PCIE_CONF_DEVICE_ID);
/* 100ms timeout value should be enough for Gen1/2 training */
err = readl_poll_timeout(port->base + PCIE_LINK_STATUS_V2, val,
!!(val & PCIE_PORT_LINKUP_V2), 20,
100 * USEC_PER_MSEC);
if (err)
return -ETIMEDOUT;
/* Set INTx mask */
val = readl(port->base + PCIE_INT_MASK);
val &= ~INTX_MASK;
writel(val, port->base + PCIE_INT_MASK);
if (IS_ENABLED(CONFIG_PCI_MSI))
mtk_pcie_enable_msi(port);
/* Set AHB to PCIe translation windows */
val = lower_32_bits(mem->start) |
AHB2PCIE_SIZE(fls(resource_size(mem)));
writel(val, port->base + PCIE_AHB_TRANS_BASE0_L);
val = upper_32_bits(mem->start);
writel(val, port->base + PCIE_AHB_TRANS_BASE0_H);
/* Set PCIe to AXI translation memory space.*/
val = PCIE2AHB_SIZE | WIN_ENABLE;
writel(val, port->base + PCIE_AXI_WINDOW0);
return 0;
}
static void __iomem *mtk_pcie_map_bus(struct pci_bus *bus,
unsigned int devfn, int where)
{
struct mtk_pcie *pcie = bus->sysdata;
writel(PCIE_CONF_ADDR(where, PCI_FUNC(devfn), PCI_SLOT(devfn),
bus->number), pcie->base + PCIE_CFG_ADDR);
return pcie->base + PCIE_CFG_DATA + (where & 3);
}
static struct pci_ops mtk_pcie_ops = {
.map_bus = mtk_pcie_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
};
static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
{
struct mtk_pcie *pcie = port->pcie;
u32 func = PCI_FUNC(port->slot);
u32 slot = PCI_SLOT(port->slot << 3);
u32 val;
int err;
/* assert port PERST_N */
val = readl(pcie->base + PCIE_SYS_CFG);
val |= PCIE_PORT_PERST(port->slot);
writel(val, pcie->base + PCIE_SYS_CFG);
/* de-assert port PERST_N */
val = readl(pcie->base + PCIE_SYS_CFG);
val &= ~PCIE_PORT_PERST(port->slot);
writel(val, pcie->base + PCIE_SYS_CFG);
/* 100ms timeout value should be enough for Gen1/2 training */
err = readl_poll_timeout(port->base + PCIE_LINK_STATUS, val,
!!(val & PCIE_PORT_LINKUP), 20,
100 * USEC_PER_MSEC);
if (err)
return -ETIMEDOUT;
/* enable interrupt */
val = readl(pcie->base + PCIE_INT_ENABLE);
val |= PCIE_PORT_INT_EN(port->slot);
writel(val, pcie->base + PCIE_INT_ENABLE);
/* map to all DDR region. We need to set it before cfg operation. */
writel(PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
port->base + PCIE_BAR0_SETUP);
/* configure class code and revision ID */
writel(PCIE_CLASS_CODE | PCIE_REVISION_ID, port->base + PCIE_CLASS);
/* configure FC credit */
writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
pcie->base + PCIE_CFG_ADDR);
val = readl(pcie->base + PCIE_CFG_DATA);
val &= ~PCIE_FC_CREDIT_MASK;
val |= PCIE_FC_CREDIT_VAL(0x806c);
writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
pcie->base + PCIE_CFG_ADDR);
writel(val, pcie->base + PCIE_CFG_DATA);
/* configure RC FTS number to 250 when it leaves L0s */
writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
pcie->base + PCIE_CFG_ADDR);
val = readl(pcie->base + PCIE_CFG_DATA);
val &= ~PCIE_FTS_NUM_MASK;
val |= PCIE_FTS_NUM_L0(0x50);
writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
pcie->base + PCIE_CFG_ADDR);
writel(val, pcie->base + PCIE_CFG_DATA);
return 0;
}
static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
{
struct mtk_pcie *pcie = port->pcie;
struct device *dev = pcie->dev;
int err;
err = clk_prepare_enable(port->sys_ck);
if (err) {
dev_err(dev, "failed to enable sys_ck%d clock\n", port->slot);
goto err_sys_clk;
}
err = clk_prepare_enable(port->ahb_ck);
if (err) {
dev_err(dev, "failed to enable ahb_ck%d\n", port->slot);
goto err_ahb_clk;
}
err = clk_prepare_enable(port->aux_ck);
if (err) {
dev_err(dev, "failed to enable aux_ck%d\n", port->slot);
goto err_aux_clk;
}
err = clk_prepare_enable(port->axi_ck);
if (err) {
dev_err(dev, "failed to enable axi_ck%d\n", port->slot);
goto err_axi_clk;
}
err = clk_prepare_enable(port->obff_ck);
if (err) {
dev_err(dev, "failed to enable obff_ck%d\n", port->slot);
goto err_obff_clk;
}
err = clk_prepare_enable(port->pipe_ck);
if (err) {
dev_err(dev, "failed to enable pipe_ck%d\n", port->slot);
goto err_pipe_clk;
}
reset_control_assert(port->reset);
reset_control_deassert(port->reset);
err = phy_init(port->phy);
if (err) {
dev_err(dev, "failed to initialize port%d phy\n", port->slot);
goto err_phy_init;
}
err = phy_power_on(port->phy);
if (err) {
dev_err(dev, "failed to power on port%d phy\n", port->slot);
goto err_phy_on;
}
if (!pcie->soc->startup(port))
return;
dev_info(dev, "Port%d link down\n", port->slot);
phy_power_off(port->phy);
err_phy_on:
phy_exit(port->phy);
err_phy_init:
clk_disable_unprepare(port->pipe_ck);
err_pipe_clk:
clk_disable_unprepare(port->obff_ck);
err_obff_clk:
clk_disable_unprepare(port->axi_ck);
err_axi_clk:
clk_disable_unprepare(port->aux_ck);
err_aux_clk:
clk_disable_unprepare(port->ahb_ck);
err_ahb_clk:
clk_disable_unprepare(port->sys_ck);
err_sys_clk:
mtk_pcie_port_free(port);
}
static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
struct device_node *node,
int slot)
{
struct mtk_pcie_port *port;
struct device *dev = pcie->dev;
struct platform_device *pdev = to_platform_device(dev);
char name[10];
int err;
port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
snprintf(name, sizeof(name), "port%d", slot);
port->base = devm_platform_ioremap_resource_byname(pdev, name);
if (IS_ERR(port->base)) {
dev_err(dev, "failed to map port%d base\n", slot);
return PTR_ERR(port->base);
}
snprintf(name, sizeof(name), "sys_ck%d", slot);
port->sys_ck = devm_clk_get(dev, name);
if (IS_ERR(port->sys_ck)) {
dev_err(dev, "failed to get sys_ck%d clock\n", slot);
return PTR_ERR(port->sys_ck);
}
/* sys_ck might be divided into the following parts in some chips */
snprintf(name, sizeof(name), "ahb_ck%d", slot);
port->ahb_ck = devm_clk_get_optional(dev, name);
if (IS_ERR(port->ahb_ck))
return PTR_ERR(port->ahb_ck);
snprintf(name, sizeof(name), "axi_ck%d", slot);
port->axi_ck = devm_clk_get_optional(dev, name);
if (IS_ERR(port->axi_ck))
return PTR_ERR(port->axi_ck);
snprintf(name, sizeof(name), "aux_ck%d", slot);
port->aux_ck = devm_clk_get_optional(dev, name);
if (IS_ERR(port->aux_ck))
return PTR_ERR(port->aux_ck);
snprintf(name, sizeof(name), "obff_ck%d", slot);
port->obff_ck = devm_clk_get_optional(dev, name);
if (IS_ERR(port->obff_ck))
return PTR_ERR(port->obff_ck);
snprintf(name, sizeof(name), "pipe_ck%d", slot);
port->pipe_ck = devm_clk_get_optional(dev, name);
if (IS_ERR(port->pipe_ck))
return PTR_ERR(port->pipe_ck);
snprintf(name, sizeof(name), "pcie-rst%d", slot);
port->reset = devm_reset_control_get_optional_exclusive(dev, name);
if (PTR_ERR(port->reset) == -EPROBE_DEFER)
return PTR_ERR(port->reset);
/* some platforms may use default PHY setting */
snprintf(name, sizeof(name), "pcie-phy%d", slot);
port->phy = devm_phy_optional_get(dev, name);
if (IS_ERR(port->phy))
return PTR_ERR(port->phy);
port->slot = slot;
port->pcie = pcie;
if (pcie->soc->setup_irq) {
err = pcie->soc->setup_irq(port, node);
if (err)
return err;
}
INIT_LIST_HEAD(&port->list);
list_add_tail(&port->list, &pcie->ports);
return 0;
}
static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
{
struct device *dev = pcie->dev;
struct platform_device *pdev = to_platform_device(dev);
struct resource *regs;
struct device_node *cfg_node;
int err;
/* get shared registers, which are optional */
regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "subsys");
if (regs) {
pcie->base = devm_ioremap_resource(dev, regs);
if (IS_ERR(pcie->base))
return PTR_ERR(pcie->base);
}
cfg_node = of_find_compatible_node(NULL, NULL,
"mediatek,generic-pciecfg");
if (cfg_node) {
pcie->cfg = syscon_node_to_regmap(cfg_node);
of_node_put(cfg_node);
if (IS_ERR(pcie->cfg))
return PTR_ERR(pcie->cfg);
}
pcie->free_ck = devm_clk_get(dev, "free_ck");
if (IS_ERR(pcie->free_ck)) {
if (PTR_ERR(pcie->free_ck) == -EPROBE_DEFER)
return -EPROBE_DEFER;
pcie->free_ck = NULL;
}
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
/* enable top level clock */
err = clk_prepare_enable(pcie->free_ck);
if (err) {
dev_err(dev, "failed to enable free_ck\n");
goto err_free_ck;
}
return 0;
err_free_ck:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
return err;
}
static int mtk_pcie_setup(struct mtk_pcie *pcie)
{
struct device *dev = pcie->dev;
struct device_node *node = dev->of_node, *child;
struct mtk_pcie_port *port, *tmp;
int err, slot;
slot = of_get_pci_domain_nr(dev->of_node);
if (slot < 0) {
for_each_available_child_of_node(node, child) {
err = of_pci_get_devfn(child);
if (err < 0) {
dev_err(dev, "failed to get devfn: %d\n", err);
goto error_put_node;
}
slot = PCI_SLOT(err);
err = mtk_pcie_parse_port(pcie, child, slot);
if (err)
goto error_put_node;
}
} else {
err = mtk_pcie_parse_port(pcie, node, slot);
if (err)
return err;
}
err = mtk_pcie_subsys_powerup(pcie);
if (err)
return err;
/* enable each port, and then check link status */
list_for_each_entry_safe(port, tmp, &pcie->ports, list)
mtk_pcie_enable_port(port);
/* power down PCIe subsys if slots are all empty (link down) */
if (list_empty(&pcie->ports))
mtk_pcie_subsys_powerdown(pcie);
return 0;
error_put_node:
of_node_put(child);
return err;
}
static int mtk_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_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;
pcie->soc = of_device_get_match_data(dev);
platform_set_drvdata(pdev, pcie);
INIT_LIST_HEAD(&pcie->ports);
err = mtk_pcie_setup(pcie);
if (err)
return err;
host->ops = pcie->soc->ops;
host->sysdata = pcie;
host->msi_domain = pcie->soc->no_msi;
err = pci_host_probe(host);
if (err)
goto put_resources;
return 0;
put_resources:
if (!list_empty(&pcie->ports))
mtk_pcie_put_resources(pcie);
return err;
}
static void mtk_pcie_free_resources(struct mtk_pcie *pcie)
{
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
struct list_head *windows = &host->windows;
pci_free_resource_list(windows);
}
static void mtk_pcie_remove(struct platform_device *pdev)
{
struct mtk_pcie *pcie = platform_get_drvdata(pdev);
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
pci_stop_root_bus(host->bus);
pci_remove_root_bus(host->bus);
mtk_pcie_free_resources(pcie);
mtk_pcie_irq_teardown(pcie);
mtk_pcie_put_resources(pcie);
}
static int mtk_pcie_suspend_noirq(struct device *dev)
{
struct mtk_pcie *pcie = dev_get_drvdata(dev);
struct mtk_pcie_port *port;
if (list_empty(&pcie->ports))
return 0;
list_for_each_entry(port, &pcie->ports, list) {
clk_disable_unprepare(port->pipe_ck);
clk_disable_unprepare(port->obff_ck);
clk_disable_unprepare(port->axi_ck);
clk_disable_unprepare(port->aux_ck);
clk_disable_unprepare(port->ahb_ck);
clk_disable_unprepare(port->sys_ck);
phy_power_off(port->phy);
phy_exit(port->phy);
}
clk_disable_unprepare(pcie->free_ck);
return 0;
}
static int mtk_pcie_resume_noirq(struct device *dev)
{
struct mtk_pcie *pcie = dev_get_drvdata(dev);
struct mtk_pcie_port *port, *tmp;
if (list_empty(&pcie->ports))
return 0;
clk_prepare_enable(pcie->free_ck);
list_for_each_entry_safe(port, tmp, &pcie->ports, list)
mtk_pcie_enable_port(port);
/* In case of EP was removed while system suspend. */
if (list_empty(&pcie->ports))
clk_disable_unprepare(pcie->free_ck);
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 mtk_pcie_soc mtk_pcie_soc_v1 = {
.no_msi = true,
.ops = &mtk_pcie_ops,
.startup = mtk_pcie_startup_port,
};
static const struct mtk_pcie_soc mtk_pcie_soc_mt2712 = {
.ops = &mtk_pcie_ops_v2,
.startup = mtk_pcie_startup_port_v2,
.setup_irq = mtk_pcie_setup_irq,
};
static const struct mtk_pcie_soc mtk_pcie_soc_mt7622 = {
.need_fix_class_id = true,
.ops = &mtk_pcie_ops_v2,
.startup = mtk_pcie_startup_port_v2,
.setup_irq = mtk_pcie_setup_irq,
};
static const struct mtk_pcie_soc mtk_pcie_soc_mt7629 = {
.need_fix_class_id = true,
.need_fix_device_id = true,
.device_id = PCI_DEVICE_ID_MEDIATEK_7629,
.ops = &mtk_pcie_ops_v2,
.startup = mtk_pcie_startup_port_v2,
.setup_irq = mtk_pcie_setup_irq,
};
static const struct of_device_id mtk_pcie_ids[] = {
{ .compatible = "mediatek,mt2701-pcie", .data = &mtk_pcie_soc_v1 },
{ .compatible = "mediatek,mt7623-pcie", .data = &mtk_pcie_soc_v1 },
{ .compatible = "mediatek,mt2712-pcie", .data = &mtk_pcie_soc_mt2712 },
{ .compatible = "mediatek,mt7622-pcie", .data = &mtk_pcie_soc_mt7622 },
{ .compatible = "mediatek,mt7629-pcie", .data = &mtk_pcie_soc_mt7629 },
{},
};
MODULE_DEVICE_TABLE(of, mtk_pcie_ids);
static struct platform_driver mtk_pcie_driver = {
.probe = mtk_pcie_probe,
.remove_new = mtk_pcie_remove,
.driver = {
.name = "mtk-pcie",
.of_match_table = mtk_pcie_ids,
.suppress_bind_attrs = true,
.pm = &mtk_pcie_pm_ops,
},
};
module_platform_driver(mtk_pcie_driver);
MODULE_DESCRIPTION("MediaTek PCIe host controller driver");
MODULE_LICENSE("GPL v2");