Re: [v4,2/3] PCI: mediatek: Add new generation controller support

Jianjun Wang
2020-11-23T06:00:54Z

On Thu, 2020-11-19 at 09:22 -0600, Rob Herring wrote:
> On Wed, Nov 18, 2020 at 04:29:34PM +0800, Jianjun Wang wrote:
> > MediaTek's PCIe host controller has three generation HWs, the new
> > generation HW is an individual bridge, it supoorts Gen3 speed and
> > up to 256 MSI interrupt numbers for multi-function devices.
> >
> > Add support for new Gen3 controller which can be found on MT8192.
> >
> > Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
> > Acked-by: Ryder Lee <ryder.lee@mediatek.com>
> > ---
> > drivers/pci/controller/Kconfig | 14 +
> > drivers/pci/controller/Makefile | 1 +
> > drivers/pci/controller/pcie-mediatek-gen3.c | 1031 +++++++++++++++++++
> > 3 files changed, 1046 insertions(+)
> > create mode 100644 drivers/pci/controller/pcie-mediatek-gen3.c
> >
> > diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
> > index f18c3725ef80..83daa772595b 100644
> > --- a/drivers/pci/controller/Kconfig
> > +++ b/drivers/pci/controller/Kconfig
> > @@ -239,6 +239,20 @@ config PCIE_MEDIATEK
> > Say Y here if you want to enable PCIe controller support on
> > MediaTek SoCs.
> >
> > +config PCIE_MEDIATEK_GEN3
> > + tristate "MediaTek GEN3 PCIe controller"
> > + depends on ARCH_MEDIATEK || COMPILE_TEST
> > + depends on OF
> > + depends on PCI_MSI_IRQ_DOMAIN
> > + help
> > + Adds support for PCIe Gen3 MAC controller for MediaTek SoCs.
> > + This PCIe controller provides the capable of Gen3, Gen2 and
> > + Gen1 speed, and support up to 256 MSI interrupt numbers for
> > + multi-function devices.
> > +
> > + Say Y here if you want to enable Gen3 PCIe controller support on
> > + MediaTek SoCs.
> > +
> > config PCIE_TANGO_SMP8759
> > bool "Tango SMP8759 PCIe controller (DANGEROUS)"
> > depends on ARCH_TANGO && PCI_MSI && OF
> > diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
> > index bcdbf49ab1e4..9c1b96777597 100644
> > --- a/drivers/pci/controller/Makefile
> > +++ b/drivers/pci/controller/Makefile
> > @@ -27,6 +27,7 @@ obj-$(CONFIG_PCIE_ROCKCHIP) += pcie-rockchip.o
> > obj-$(CONFIG_PCIE_ROCKCHIP_EP) += pcie-rockchip-ep.o
> > obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o
> > obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
> > +obj-$(CONFIG_PCIE_MEDIATEK_GEN3) += pcie-mediatek-gen3.o
> > obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o
> > obj-$(CONFIG_VMD) += vmd.o
> > obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o
> > diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> > new file mode 100644
> > index 000000000000..dd454cfee373
> > --- /dev/null
> > +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> > @@ -0,0 +1,1031 @@
> > +// 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/of_address.h>
> > +#include <linux/of_clk.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_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(devfn, bus) \
> > + (PCIE_CFG_DEVFN(devfn) | PCIE_CFG_BUS(bus))
> > +
> > +#define PCIE_CFG_HEADER_FORCE_BE(devfn, bus, bytes) \
> > + (PCIE_CFG_HEADER(devfn, bus) | PCIE_CFG_BYTE_EN(bytes) \
> > + | PCIE_CFG_FORCE_BYTE_EN)
> > +
> > +#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_MISC_STATUS_REG 0x14C
> > +#define PCIE_LTR_MSG_RECEIVED BIT(0)
> > +#define PCIE_PCIE_MSG_RECEIVED BIT(1)
> > +
> > +#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_L0 0x10
> > +#define PCIE_LTSSM_STATE_L1_IDLE 0x13
> > +#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_MASK GENMASK(PCIE_MSI_SET_NUM + 8 - 1, 8)
> > +#define PCIE_MSI_SHIFT 8
> > +#define PCIE_INTX_SHIFT 24
> > +#define PCIE_INTX_MASK GENMASK(27, 24)
> > +#define PCIE_MSG_MASK BIT(28)
> > +#define PCIE_AER_MASK BIT(29)
> > +#define PCIE_PM_MASK BIT(30)
> > +
> > +#define PCIE_INT_STATUS_REG 0x184
> > +#define PCIE_MSI_SET_ENABLE_REG 0x190
> > +
> > +#define PCIE_LOW_POWER_CTRL_REG 0x194
> > +#define PCIE_DIS_LOWPWR_MASK GENMASK(3, 0)
> > +#define PCIE_DIS_L0S_MASK BIT(0)
> > +#define PCIE_DIS_L1_MASK BIT(1)
> > +#define PCIE_DIS_L11_MASK BIT(2)
> > +#define PCIE_DIS_L12_MASK BIT(3)
> > +#define PCIE_FORCE_DIS_LOWPWR GENMASK(11, 8)
> > +#define PCIE_FORCE_DIS_L0S BIT(8)
> > +#define PCIE_FORCE_DIS_L1 BIT(9)
> > +#define PCIE_FORCE_DIS_L11 BIT(10)
> > +#define PCIE_FORCE_DIS_L12 BIT(11)
> > +
> > +#define PCIE_ICMD_PM_REG 0x198
> > +#define PCIE_TURN_OFF_LINK BIT(4)
> > +
> > +#define PCIE_MSI_ADDR_BASE_REG 0xc00
> > +#define PCIE_MSI_SET_OFFSET 0x10
> > +#define PCIE_MSI_STATUS_OFFSET 0x04
> > +#define PCIE_MSI_ENABLE_OFFSET 0x08
> > +
> > +#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 ATR_EN BIT(0)
> > +#define ATR_SIZE(size) ((((size) - 1) << 1) & GENMASK(6, 1))
> > +#define ATR_ID(id) (id & GENMASK(3, 0))
> > +#define ATR_PARAM(param) (((param) << 16) & GENMASK(27, 16))
> > +
> > +/**
> > + * struct mtk_pcie_msi - MSI information for each set
> > + * @base: IO mapped register base
> > + * @irq: MSI set Interrupt number
> > + * @index: MSI set number
> > + * @msg_addr: MSI message address
> > + * @domain: IRQ domain
> > + */
> > +struct mtk_pcie_msi {
> > + void __iomem *base;
> > + unsigned int irq;
> > + int index;
> > + phys_addr_t msg_addr;
> > + struct irq_domain *domain;
> > +};
> > +
> > +/**
> > + * struct mtk_pcie_port - PCIe port information
> > + * @dev: 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
> > + * @is_suspended: device suspend state
> > + * @irq: PCIe controller interrupt number
> > + * @intx_domain: legacy INTx IRQ domain
> > + * @msi_domain: MSI IRQ domain
> > + * @msi_top_domain: MSI IRQ top domain
> > + * @msi_info: MSI sets information
> > + * @lock: lock protecting IRQ bit map
> > + * @msi_irq_in_use: bit map for assigned MSI IRQ
> > + */
> > +struct mtk_pcie_port {
> > + 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;
> > + bool is_suspended;
> > +
> > + int irq;
> > + struct irq_domain *intx_domain;
> > + struct irq_domain *msi_domain;
> > + struct irq_domain *msi_top_domain;
> > + struct mtk_pcie_msi **msi_info;
> > + struct mutex lock;
> > + DECLARE_BITMAP(msi_irq_in_use, PCIE_MSI_IRQS_NUM);
> > +};
> > +
> > +static int mtk_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
> > + int where, int size, u32 *val)
> > +{
> > + struct mtk_pcie_port *port = bus->sysdata;
> > + int bytes;
> > +
> > + bytes = ((1 << size) - 1) << (where & 0x3);
> > + writel(PCIE_CFG_HEADER_FORCE_BE(devfn, bus->number, bytes),
> > + port->base + PCIE_CFGNUM_REG);
>
> Put this in a map_bus() function and then use pci_generic_config_read32
> and _write32.
>
> 32-bit only accesses are problematic. Do you require 32-bit accesses for
> downstream devices or just root port/bus? You can now define child_ops.

Hi Rob,

Thanks for your review, I will split it to a map_bus() function and
read/write functions with pci_generic_config_read32/write32 in the next
version.

The CPU interface can be 32-bit only accesses, we will enable the
significant bytes which in the TLP header by setting the register of
PCIE_CFGNUM_REG.

Thanks.
>
> > +
> > + *val = readl(port->base + PCIE_CFG_OFFSET_ADDR + (where & ~0x3));
> > +
> > + if (size <= 2)
> > + *val = (*val >> (8 * (where & 0x3))) & ((1 << (size * 8)) - 1);
> > +
> > + return PCIBIOS_SUCCESSFUL;
> > +}
> > +
> > +static int mtk_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
> > + int where, int size, u32 val)
> > +{
> > + struct mtk_pcie_port *port = bus->sysdata;
> > + int bytes;
> > +
> > + bytes = ((1 << size) - 1) << (where & 0x3);
> > + writel(PCIE_CFG_HEADER_FORCE_BE(devfn, bus->number, bytes),
> > + port->base + PCIE_CFGNUM_REG);
> > +
> > + if (size <= 2)
> > + val = (val & ((1 << (size * 8)) - 1)) << ((where & 0x3) * 8);
> > +
> > + writel(val, port->base + PCIE_CFG_OFFSET_ADDR + (where & ~0x3));
> > +
> > + return PCIBIOS_SUCCESSFUL;
> > +}
> > +
> > +static struct pci_ops mtk_pcie_ops = {
> > + .read = mtk_pcie_config_read,
> > + .write = mtk_pcie_config_write,
> > +};
> > +
> > +static void mtk_pcie_set_trans_window(void __iomem *reg,
> > + resource_size_t cpu_addr,
> > + resource_size_t pci_addr, size_t size)
> > +{
> > + writel(lower_32_bits(cpu_addr) | ATR_SIZE(fls(size) - 1) | ATR_EN, reg);
> > + writel(upper_32_bits(cpu_addr), reg + PCIE_ATR_SRC_ADDR_MSB_OFFSET);
> > + writel(lower_32_bits(pci_addr), reg + PCIE_ATR_TRSL_ADDR_LSB_OFFSET);
> > + writel(upper_32_bits(pci_addr), reg + PCIE_ATR_TRSL_ADDR_MSB_OFFSET);
> > + writel(ATR_ID(0) | ATR_PARAM(0), reg + PCIE_ATR_TRSL_PARAM_OFFSET);
> > +}
> > +
> > +static int mtk_pcie_set_trans_table(void __iomem *reg,
> > + resource_size_t cpu_addr,
> > + resource_size_t pci_addr, size_t size,
> > + int num)
>
> Just merge these 2 functions into 1.
>
> > +{
> > + void __iomem *table_base;
> > +
> > + if (num > PCIE_MAX_TRANS_TABLES)
> > + return -ENODEV;
> > +
> > + table_base = reg + num * PCIE_ATR_TLB_SET_OFFSET;
> > + mtk_pcie_set_trans_window(table_base, cpu_addr, pci_addr, size);
> > +
> > + return 0;
> > +}
> > +
> > +static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
> > +{
> > + struct resource_entry *entry;
> > + struct pci_host_bridge *host = pci_host_bridge_from_priv(port);
> > + unsigned int table_index = 0;
> > + int err;
> > + u32 val;
> > +
> > + /* Set as RC mode */
> > + val = readl(port->base + PCIE_SETTING_REG);
> > + val |= PCIE_RC_MODE;
> > + writel(val, port->base + PCIE_SETTING_REG);
> > +
> > + /* Set class code */
> > + val = readl(port->base + PCIE_PCI_IDS_1);
> > + val &= ~GENMASK(31, 8);
> > + val |= PCI_CLASS(PCI_CLASS_BRIDGE_PCI << 8);
> > + writel(val, port->base + PCIE_PCI_IDS_1);
> > +
> > + /* Assert all reset signals */
> > + val = readl(port->base + PCIE_RST_CTRL_REG);
> > + val |= PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB;
> > + writel(val, port->base + PCIE_RST_CTRL_REG);
> > +
> > + /* De-assert reset signals*/
> > + val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB);
> > + writel(val, port->base + PCIE_RST_CTRL_REG);
> > +
> > + /* Delay 100ms to wait the reference clocks become stable */
> > + usleep_range(100 * 1000, 120 * 1000);
> > +
> > + /* De-assert pe reset*/
> > + val &= ~PCIE_PE_RSTB;
> > + writel(val, port->base + PCIE_RST_CTRL_REG);
> > +
> > + /* Check if the link is up or not */
> > + err = readl_poll_timeout(port->base + PCIE_LINK_STATUS_REG, val,
> > + !!(val & PCIE_PORT_LINKUP), 20,
> > + 50 * USEC_PER_MSEC);
> > + if (err) {
> > + val = readl(port->base + PCIE_LTSSM_STATUS_REG);
> > + dev_dbg(port->dev, "ltssm reg val: %#x\n", val);
> > + return err;
> > + }
> > +
> > + /* Set PCIe translation windows */
> > + resource_list_for_each_entry(entry, &host->windows) {
> > + unsigned long type = resource_type(entry->res);
> > + struct resource *res = NULL;
> > + resource_size_t cpu_addr;
> > + resource_size_t pci_addr;
> > +
> > + if (!(type & (IORESOURCE_MEM | IORESOURCE_IO)))
> > + continue;
> > +
> > + res = entry->res;
> > + cpu_addr = res->start;
> > + pci_addr = res->start - entry->offset;
> > + mtk_pcie_set_trans_table(port->base + PCIE_TRANS_TABLE_BASE_REG,
> > + cpu_addr, pci_addr, resource_size(res),
> > + table_index);
>
> You don't distinguish IO regions in any way. How can that work?

The IO regions need additional settings, I will fix it in the next
version.
>
> > +
> > + dev_dbg(port->dev, "Set %s trans window[%d]: cpu_addr = %#llx, pci_addr = %#llx, size = %#llx\n",
> > + (!!(type & IORESOURCE_MEM) ? "MEM" : "IO"), table_index,
> > + cpu_addr, pci_addr, resource_size(res));
> > +
> > + table_index++;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static inline struct mtk_pcie_msi *mtk_get_msi_info(struct mtk_pcie_port *port,
> > + unsigned long hwirq)
> > +{
> > + return port->msi_info[hwirq / PCIE_MSI_IRQS_PER_SET];
> > +}
> > +
> > +static int mtk_pcie_set_affinity(struct irq_data *data,
> > + const struct cpumask *mask, bool force)
> > +{
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > + int ret;
> > +
> > + ret = irq_set_affinity_hint(port->irq, mask);
> > + if (ret)
> > + return ret;
> > +
> > + irq_data_update_effective_affinity(data, mask);
> > +
> > + return 0;
> > +}
> > +
> > +static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
> > +{
> > + struct mtk_pcie_msi *msi_info;
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > +
> > + msi_info = mtk_get_msi_info(port, data->hwirq);
> > +
> > + msg->address_hi = 0;
> > + msg->address_lo = lower_32_bits(msi_info->msg_addr);
> > +
> > + msg->data = data->hwirq;
> > + dev_dbg(port->dev, "msi#%#lx address_hi %#x address_lo %#x data %d\n",
> > + data->hwirq, msg->address_hi, msg->address_lo, msg->data);
> > +}
> > +
> > +static void mtk_msi_irq_ack(struct irq_data *data)
> > +{
> > + struct mtk_pcie_msi *msi_info;
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > + unsigned long hwirq;
> > +
> > + msi_info = mtk_get_msi_info(port, data->hwirq);
> > +
> > + hwirq = data->hwirq % PCIE_MSI_IRQS_PER_SET;
> > +
> > + writel(1 << hwirq, msi_info->base + PCIE_MSI_STATUS_OFFSET);
> > +}
> > +
> > +static void mtk_msi_irq_mask(struct irq_data *data)
> > +{
> > + struct mtk_pcie_msi *msi_info;
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > + u32 val;
> > +
> > + msi_info = mtk_get_msi_info(port, data->hwirq);
> > + val = readl(msi_info->base + PCIE_MSI_ENABLE_OFFSET);
> > + val &= ~(1 << data->hwirq);
>
> Use BIT() macro here and elsewhere.
>
> > + writel(val, msi_info->base + PCIE_MSI_ENABLE_OFFSET);
> > +
> > + pci_msi_mask_irq(data);
> > +}
> > +
> > +static void mtk_msi_irq_unmask(struct irq_data *data)
> > +{
> > + struct mtk_pcie_msi *msi_info;
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > + u32 val;
> > +
> > + msi_info = mtk_get_msi_info(port, data->hwirq);
> > + val = readl(msi_info->base + PCIE_MSI_ENABLE_OFFSET);
> > + val |= (1 << data->hwirq);
> > + writel(val, msi_info->base + PCIE_MSI_ENABLE_OFFSET);
> > +
> > + pci_msi_unmask_irq(data);
> > +}
> > +
> > +static struct irq_chip mtk_msi_irq_chip = {
> > + .irq_ack = mtk_msi_irq_ack,
> > + .irq_compose_msi_msg = mtk_compose_msi_msg,
> > + .irq_mask = mtk_msi_irq_mask,
> > + .irq_unmask = mtk_msi_irq_unmask,
> > + .irq_set_affinity = mtk_pcie_set_affinity,
> > + .name = "PCIe",
> > +};
> > +
> > +static irq_hw_number_t mtk_pcie_msi_get_hwirq(struct msi_domain_info *info,
> > + msi_alloc_info_t *arg)
> > +{
> > + struct msi_desc *entry = arg->desc;
> > + struct mtk_pcie_port *port = info->chip_data;
> > + int hwirq;
> > +
> > + mutex_lock(&port->lock);
> > +
> > + hwirq = bitmap_find_free_region(port->msi_irq_in_use, PCIE_MSI_IRQS_NUM,
> > + order_base_2(entry->nvec_used));
> > + if (hwirq < 0) {
> > + mutex_unlock(&port->lock);
> > + return -ENOSPC;
> > + }
> > +
> > + mutex_unlock(&port->lock);
> > +
> > + return hwirq;
> > +}
> > +
> > +static void mtk_pcie_msi_free(struct irq_domain *domain,
> > + struct msi_domain_info *info, unsigned int virq)
> > +{
> > + struct irq_data *data = irq_domain_get_irq_data(domain, virq);
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > +
> > + mutex_lock(&port->lock);
> > +
> > + bitmap_clear(port->msi_irq_in_use, data->hwirq, 1);
> > +
> > + mutex_unlock(&port->lock);
> > +}
> > +
> > +static struct msi_domain_ops mtk_msi_domain_ops = {
> > + .get_hwirq = mtk_pcie_msi_get_hwirq,
> > + .msi_free = mtk_pcie_msi_free,
> > +};
> > +
> > +static struct msi_domain_info mtk_msi_domain_info = {
> > + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_PCI_MSIX |
> > + MSI_FLAG_USE_DEF_CHIP_OPS | MSI_FLAG_MULTI_PCI_MSI),
> > + .chip = &mtk_msi_irq_chip,
> > + .ops = &mtk_msi_domain_ops,
> > + .handler = handle_edge_irq,
> > + .handler_name = "MSI",
> > +};
> > +
> > +static void mtk_msi_top_irq_eoi(struct irq_data *data)
> > +{
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > + unsigned long msi_irq = data->hwirq + PCIE_MSI_SHIFT;
> > +
> > + writel(1 << msi_irq, port->base + PCIE_INT_STATUS_REG);
> > +}
> > +
> > +static struct irq_chip mtk_msi_top_irq_chip = {
> > + .irq_eoi = mtk_msi_top_irq_eoi,
> > + .name = "PCIe",
> > +};
> > +
> > +static void mtk_pcie_msi_handler(struct irq_desc *desc)
> > +{
> > + struct mtk_pcie_msi *msi_info = irq_desc_get_handler_data(desc);
> > + struct irq_chip *irqchip = irq_desc_get_chip(desc);
> > + unsigned long msi_enable, msi_status;
> > + unsigned int virq;
> > + irq_hw_number_t bit, hwirq;
> > +
> > + chained_irq_enter(irqchip, desc);
> > +
> > + msi_enable = readl(msi_info->base + PCIE_MSI_ENABLE_OFFSET);
> > + while ((msi_status = readl(msi_info->base + PCIE_MSI_STATUS_OFFSET))) {
> > + msi_status &= msi_enable;
> > + for_each_set_bit(bit, &msi_status, PCIE_MSI_IRQS_PER_SET) {
> > + hwirq = bit + msi_info->index * PCIE_MSI_IRQS_PER_SET;
> > + virq = irq_find_mapping(msi_info->domain, hwirq);
> > + generic_handle_irq(virq);
> > + }
> > + }
> > +
> > + chained_irq_exit(irqchip, desc);
> > +}
> > +
> > +static int mtk_msi_top_domain_map(struct irq_domain *domain,
> > + unsigned int virq, irq_hw_number_t hwirq)
> > +{
> > + struct mtk_pcie_port *port = domain->host_data;
> > + struct mtk_pcie_msi *msi_info = port->msi_info[hwirq];
> > +
> > + irq_domain_set_info(domain, virq, hwirq,
> > + &mtk_msi_top_irq_chip, domain->host_data,
> > + mtk_pcie_msi_handler, msi_info, NULL);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct irq_domain_ops mtk_msi_top_domain_ops = {
> > + .map = mtk_msi_top_domain_map,
> > +};
> > +
> > +static void mtk_intx_mask(struct irq_data *data)
> > +{
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > + u32 val;
> > +
> > + val = readl(port->base + PCIE_INT_ENABLE_REG);
> > + val &= ~(1 << (data->hwirq + PCIE_INTX_SHIFT));
> > + writel(val, port->base + PCIE_INT_ENABLE_REG);
> > +}
> > +
> > +static void mtk_intx_unmask(struct irq_data *data)
> > +{
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > + u32 val;
> > +
> > + val = readl(port->base + PCIE_INT_ENABLE_REG);
> > + val |= 1 << (data->hwirq + PCIE_INTX_SHIFT);
> > + writel(val, port->base + PCIE_INT_ENABLE_REG);
> > +}
> > +
> > +static void mtk_intx_eoi(struct irq_data *data)
> > +{
> > + struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > + unsigned long hwirq;
> > +
> > + /**
> > + * As an emulated level irq, its interrupt status will be remained
> > + * until receive the corresponding message of de-assert, hence that
> > + * the status can only be cleared when the interrupt has been serviced.
> > + */
> > + hwirq = data->hwirq + PCIE_INTX_SHIFT;
> > + writel(1 << hwirq, port->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 = "PCIe",
> > +};
> > +
> > +static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
> > + irq_hw_number_t hwirq)
> > +{
> > + irq_set_chip_and_handler_name(irq, &mtk_intx_irq_chip,
> > + handle_fasteoi_irq, "INTx");
> > + 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_domains(struct mtk_pcie_port *port,
> > + struct device_node *node)
> > +{
> > + struct device *dev = port->dev;
> > + struct device_node *intc_node;
> > + struct fwnode_handle *fwnode = of_node_to_fwnode(node);
> > + struct mtk_pcie_msi *msi_info;
> > + struct msi_domain_info *info;
> > + int i, ret;
> > +
> > + /* Setup INTx */
> > + intc_node = of_get_child_by_name(node, "interrupt-controller");
> > + if (!intc_node) {
> > + dev_notice(dev, "Missing PCIe Intc node\n");
> > + return -ENODEV;
> > + }
> > +
> > + port->intx_domain = irq_domain_add_linear(intc_node, PCI_NUM_INTX,
> > + &intx_domain_ops, port);
> > + if (!port->intx_domain) {
> > + dev_notice(dev, "failed to get INTx IRQ domain\n");
> > + return -ENODEV;
> > + }
> > +
> > + /* Setup MSI */
> > + mutex_init(&port->lock);
> > +
> > + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
> > + if (!info)
> > + return -ENOMEM;
> > +
> > + memcpy(info, &mtk_msi_domain_info, sizeof(*info));
> > + info->chip_data = port;
> > +
> > + port->msi_domain = pci_msi_create_irq_domain(fwnode, info, NULL);
> > + if (!port->msi_domain) {
> > + dev_info(dev, "failed to create msi domain\n");
> > + ret = -ENODEV;
> > + goto err_msi_domain;
> > + }
> > +
> > + /* Enable MSI and setup pcie domains */
> > + port->msi_top_domain = irq_domain_add_hierarchy(NULL, 0, 0, node,
> > + &mtk_msi_top_domain_ops,
> > + port);
> > + if (!port->msi_top_domain) {
> > + dev_info(dev, "failed to create msi top domain\n");
> > + ret = -ENODEV;
> > + goto err_msi_top_domain;
> > + }
> > +
> > + port->msi_info = devm_kzalloc(dev, PCIE_MSI_SET_NUM, GFP_KERNEL);
> > + if (!port->msi_info) {
> > + ret = -ENOMEM;
> > + goto err_msi_info;
> > + }
> > +
> > + for (i = 0; i < PCIE_MSI_SET_NUM; i++) {
> > + int offset = i * PCIE_MSI_SET_OFFSET;
> > + u32 val;
> > +
> > + msi_info = devm_kzalloc(dev, sizeof(*msi_info), GFP_KERNEL);
> > + if (!msi_info) {
> > + ret = -ENOMEM;
> > + goto err_msi_set;
> > + }
> > +
> > + msi_info->base = port->base + PCIE_MSI_ADDR_BASE_REG + offset;
> > + msi_info->msg_addr = port->reg_base + PCIE_MSI_ADDR_BASE_REG +
> > + offset;
> > +
> > + writel(lower_32_bits(msi_info->msg_addr), msi_info->base);
> > +
> > + msi_info->index = i;
> > + msi_info->domain = port->msi_domain;
> > +
> > + port->msi_info[i] = msi_info;
> > +
> > + /* Alloc irq for each msi set */
> > + msi_info->irq = irq_create_mapping(port->msi_top_domain, i);
> > + if (!msi_info->irq) {
> > + dev_info(dev, "allocate msi top irq failed\n");
> > + ret = -ENOSPC;
> > + goto err_msi_set;
> > + }
> > +
> > + val = readl(port->base + PCIE_INT_ENABLE_REG);
> > + val |= (1 << (i + PCIE_MSI_SHIFT));
> > + writel(val, port->base + PCIE_INT_ENABLE_REG);
> > +
> > + val = readl(port->base + PCIE_MSI_SET_ENABLE_REG);
> > + val |= (1 << i);
> > + writel(val, port->base + PCIE_MSI_SET_ENABLE_REG);
> > + }
> > +
> > + return 0;
> > +
> > +err_msi_set:
> > + while (--i >= 0) {
> > + msi_info = port->msi_info[i];
> > + irq_dispose_mapping(msi_info->irq);
> > + }
> > +err_msi_info:
> > + irq_domain_remove(port->msi_top_domain);
> > +err_msi_top_domain:
> > + irq_domain_remove(port->msi_domain);
> > +err_msi_domain:
> > + irq_domain_remove(port->intx_domain);
> > +
> > + return ret;
> > +}
> > +
> > +static void mtk_pcie_irq_teardown(struct mtk_pcie_port *port)
> > +{
> > + struct mtk_pcie_msi *msi_info;
> > + int i;
> > +
> > + irq_set_chained_handler_and_data(port->irq, NULL, NULL);
> > +
> > + if (port->intx_domain)
> > + irq_domain_remove(port->intx_domain);
> > +
> > + if (port->msi_domain)
> > + irq_domain_remove(port->msi_domain);
> > +
> > + if (port->msi_top_domain) {
> > + for (i = 0; i < PCIE_MSI_SET_NUM; i++) {
> > + msi_info = port->msi_info[i];
> > + irq_dispose_mapping(msi_info->irq);
> > + }
> > +
> > + irq_domain_remove(port->msi_top_domain);
> > + }
> > +
> > + irq_dispose_mapping(port->irq);
> > +}
> > +
> > +static void mtk_pcie_irq_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;
> > + unsigned int virq;
> > + irq_hw_number_t irq_bit = PCIE_INTX_SHIFT;
> > +
> > + chained_irq_enter(irqchip, desc);
> > +
> > + status = readl(port->base + PCIE_INT_STATUS_REG);
> > + if (status & PCIE_INTX_MASK) {
> > + for_each_set_bit_from(irq_bit, &status, PCI_NUM_INTX +
> > + PCIE_INTX_SHIFT) {
> > + virq = irq_find_mapping(port->intx_domain,
> > + irq_bit - PCIE_INTX_SHIFT);
> > + generic_handle_irq(virq);
> > + }
> > + }
> > +
> > + if (status & PCIE_MSI_MASK) {
> > + irq_bit = PCIE_MSI_SHIFT;
> > + for_each_set_bit_from(irq_bit, &status, PCIE_MSI_SET_NUM +
> > + PCIE_MSI_SHIFT) {
> > + virq = irq_find_mapping(port->msi_top_domain,
> > + irq_bit - PCIE_MSI_SHIFT);
> > + generic_handle_irq(virq);
> > + }
> > + }
> > +
> > + chained_irq_exit(irqchip, desc);
> > +}
> > +
> > +static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
> > + struct device_node *node)
> > +{
> > + struct device *dev = port->dev;
> > + struct platform_device *pdev = to_platform_device(dev);
> > + int err;
> > +
> > + err = mtk_pcie_init_irq_domains(port, node);
> > + if (err) {
> > + dev_notice(dev, "failed to init PCIe IRQ domain\n");
> > + return err;
> > + }
> > +
> > + port->irq = platform_get_irq(pdev, 0);
> > + if (port->irq < 0)
> > + return port->irq;
> > +
> > + irq_set_chained_handler_and_data(port->irq, mtk_pcie_irq_handler, port);
> > +
> > + return 0;
> > +}
> > +
> > +static int mtk_pcie_clk_init(struct mtk_pcie_port *port)
> > +{
> > + int ret;
> > +
> > + port->num_clks = devm_clk_bulk_get_all(port->dev, &port->clks);
> > + if (port->num_clks < 0) {
> > + dev_notice(port->dev, "failed to get pcie clock\n");
> > + return port->num_clks;
> > + }
> > +
> > + ret = clk_bulk_prepare_enable(port->num_clks, port->clks);
> > + if (ret) {
> > + dev_notice(port->dev, "failed to enable pcie clocks\n");
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int mtk_pcie_power_up(struct mtk_pcie_port *port)
> > +{
> > + struct device *dev = port->dev;
> > + int err;
> > +
> > + port->phy_reset = devm_reset_control_get_optional_exclusive(dev, "phy");
> > + if (IS_ERR(port->phy_reset))
> > + return PTR_ERR(port->phy_reset);
> > +
> > + /* PHY power on and enable pipe clock */
> > + port->phy = devm_phy_optional_get(dev, "pcie-phy");
> > + if (IS_ERR(port->phy))
> > + return PTR_ERR(port->phy);
> > +
> > + reset_control_deassert(port->phy_reset);
> > +
> > + err = phy_power_on(port->phy);
> > + if (err) {
> > + dev_notice(dev, "failed to power on pcie phy\n");
> > + goto err_phy_on;
> > + }
> > +
> > + err = phy_init(port->phy);
> > + if (err) {
> > + dev_notice(dev, "failed to initialize pcie phy\n");
> > + goto err_phy_init;
> > + }
> > +
> > + port->mac_reset = devm_reset_control_get_optional_exclusive(dev, "mac");
> > + if (IS_ERR(port->mac_reset)) {
> > + err = PTR_ERR(port->mac_reset);
> > + goto err_mac_rst;
> > + }
> > +
> > + reset_control_deassert(port->mac_reset);
> > +
> > + /* MAC power on and enable transaction layer clocks */
> > + pm_runtime_enable(dev);
> > + pm_runtime_get_sync(dev);
> > +
> > + err = mtk_pcie_clk_init(port);
> > + if (err) {
> > + dev_notice(dev, "clock init failed\n");
> > + goto err_clk_init;
> > + }
> > +
> > + return 0;
> > +
> > +err_clk_init:
> > + pm_runtime_put_sync(dev);
> > + pm_runtime_disable(dev);
> > + reset_control_assert(port->mac_reset);
> > +err_mac_rst:
> > + phy_exit(port->phy);
> > +err_phy_init:
> > + phy_power_off(port->phy);
> > +err_phy_on:
> > + reset_control_assert(port->phy_reset);
> > +
> > + return err;
> > +}
> > +
> > +static void mtk_pcie_power_down(struct mtk_pcie_port *port)
> > +{
> > + clk_bulk_disable_unprepare(port->num_clks, port->clks);
> > +
> > + pm_runtime_put_sync(port->dev);
> > + pm_runtime_disable(port->dev);
> > + reset_control_assert(port->mac_reset);
> > +
> > + phy_power_off(port->phy);
> > + phy_exit(port->phy);
> > + reset_control_assert(port->phy_reset);
> > +}
> > +
> > +static int mtk_pcie_setup(struct mtk_pcie_port *port)
> > +{
> > + struct device *dev = port->dev;
> > + struct platform_device *pdev = to_platform_device(dev);
> > + struct resource *regs;
> > + int err;
> > +
> > + regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcie-mac");
> > + port->base = devm_ioremap_resource(dev, regs);
> > + if (IS_ERR(port->base)) {
> > + dev_notice(dev, "failed to map register base\n");
> > + return PTR_ERR(port->base);
> > + }
> > +
> > + port->reg_base = regs->start;
> > +
> > + /* Don't touch the hardware registers before power up */
> > + err = mtk_pcie_power_up(port);
> > + if (err)
> > + return err;
> > +
> > + /* Try link up */
> > + err = mtk_pcie_startup_port(port);
> > + if (err) {
> > + dev_notice(dev, "PCIe link down\n");
> > + goto err_setup;
> > + }
> > +
> > + err = mtk_pcie_setup_irq(port, dev->of_node);
> > + if (err)
> > + goto err_setup;
> > +
> > + dev_info(dev, "PCIe link up success!\n");
> > +
> > + return 0;
> > +
> > +err_setup:
> > + mtk_pcie_power_down(port);
> > +
> > + return err;
> > +}
> > +
> > +static int mtk_pcie_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct mtk_pcie_port *port;
> > + struct pci_host_bridge *host;
> > + int err;
> > +
> > + host = devm_pci_alloc_host_bridge(dev, sizeof(*port));
> > + if (!host)
> > + return -ENOMEM;
> > +
> > + port = pci_host_bridge_priv(host);
> > +
> > + port->dev = dev;
> > + platform_set_drvdata(pdev, port);
> > +
> > + err = mtk_pcie_setup(port);
> > + if (err)
> > + return err;
> > +
> > + host->ops = &mtk_pcie_ops;
> > + host->sysdata = port;
> > +
> > + err = pci_host_probe(host);
> > + if (err) {
> > + mtk_pcie_power_down(port);
>
> mtk_pcie_irq_teardown needed here?

Yes, I will add this function in the next version.
>
> > + return err;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int mtk_pcie_remove(struct platform_device *pdev)
> > +{
> > + struct mtk_pcie_port *port = platform_get_drvdata(pdev);
> > + struct pci_host_bridge *host = pci_host_bridge_from_priv(port);
> > +
> > + pci_lock_rescan_remove();
> > + pci_stop_root_bus(host->bus);
> > + pci_remove_root_bus(host->bus);
> > + pci_unlock_rescan_remove();
> > +
> > + mtk_pcie_irq_teardown(port);
> > + mtk_pcie_power_down(port);
> > +
> > + return 0;
> > +}
> > +
> > +static int __maybe_unused mtk_pcie_turn_off_link(struct mtk_pcie_port *port)
> > +{
> > + u32 val;
> > +
> > + val = readl(port->base + PCIE_ICMD_PM_REG);
> > + val |= PCIE_TURN_OFF_LINK;
> > + writel(val, port->base + PCIE_ICMD_PM_REG);
> > +
> > + /* Check the link is L2 */
> > + return readl_poll_timeout(port->base + PCIE_LTSSM_STATUS_REG, val,
> > + (PCIE_LTSSM_STATE(val) ==
> > + PCIE_LTSSM_STATE_L2_IDLE), 20,
> > + 50 * USEC_PER_MSEC);
> > +}
> > +
> > +static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev)
> > +{
> > + struct mtk_pcie_port *port = dev_get_drvdata(dev);
> > + int err;
> > + u32 val;
> > +
> > + if (port->is_suspended)
> > + return 0;
>
> I don't think this variable is needed. The core should track calling
> suspend/resume.

OK, I will remove it in the next version.
>
> > +
> > + /* Trigger link to L2 state */
> > + err = mtk_pcie_turn_off_link(port);
> > + if (err) {
> > + dev_notice(port->dev, "can not enter L2 state\n");
>
> Seems more like an error.
>
> > + goto power_off;
> > + }
> > +
> > + /* Pull down the PERST# pin */
> > + val = readl(port->base + PCIE_RST_CTRL_REG);
> > + val |= PCIE_PE_RSTB;
> > + writel(val, port->base + PCIE_RST_CTRL_REG);
> > +
> > + dev_info(port->dev, "enter L2 state success");
>
> Seems like debug.
>
> > +
> > +power_off:
> > + clk_bulk_disable_unprepare(port->num_clks, port->clks);
> > +
> > + phy_power_off(port->phy);
> > +
> > + port->is_suspended = true;
> > +
> > + return 0;
> > +}
> > +
> > +static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
> > +{
> > + struct mtk_pcie_port *port = dev_get_drvdata(dev);
> > + int err;
> > +
> > + if (!port->is_suspended)
> > + return 0;
> > +
> > + phy_power_on(port->phy);
> > +
> > + err = clk_bulk_prepare_enable(port->num_clks, port->clks);
> > + if (err) {
> > + dev_dbg(dev, "failed to enable pcie clocks\n");
> > + return err;
> > + }
> > +
> > + err = mtk_pcie_startup_port(port);
> > + if (err) {
> > + dev_notice(port->dev, "resume failed\n");
> > + return err;
> > + }
> > +
> > + port->is_suspended = false;
> > +
> > + dev_info(port->dev, "resume done\n");
>
> Debug...
>
> > +
> > + return 0;
> > +}
> > +
> > +static const struct dev_pm_ops mtk_pcie_pm_ops = {
> > + SET_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" },
> > + {},
> > +};
> > +
> > +static struct platform_driver mtk_pcie_driver = {
> > + .probe = mtk_pcie_probe,
> > + .remove = mtk_pcie_remove,
> > + .driver = {
> > + .name = "mtk-pcie",
> > + .of_match_table = mtk_pcie_of_match,
> > + .pm = &mtk_pcie_pm_ops,
> > + },
> > +};
> > +
> > +module_platform_driver(mtk_pcie_driver);
> > +MODULE_LICENSE("GPL v2");
> > --
> > 2.25.1
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