[v1,2/3] PCI: mediatek: Add new generation controller support

Jianjun Wang
2020-09-07T12:18:04Z

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.

Acked-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
---
drivers/pci/controller/Kconfig | 14 +
drivers/pci/controller/Makefile | 1 +
drivers/pci/controller/pcie-mediatek-gen3.c | 1063 +++++++++++++++++++
3 files changed, 1078 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..b76baeac3b98
--- /dev/null
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -0,0 +1,1063 @@
+// 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
+ * @hwirq: Hardware interrupt number
+ * @irq: MSI set Interrupt number
+ * @index: MSI set number
+ * @msg_addr: MSI message address
+ * @domain: IRQ domain
+ */
+struct mtk_pcie_msi {
+ void __iomem *base;
+ int hwirq;
+ 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 **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);
+
+ *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)
+{
+ 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);
+ u32 val;
+ int err = 0, table_index = 0;
+
+ /* 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);
+
+ 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)
+ 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);
+
+ 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 int 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);
+ int 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);
+ int 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_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);
+ int 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_ack(struct irq_data *data)
+{
+ struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
+ int 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_ack = mtk_msi_top_irq_ack,
+ .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;
+ u32 virq, bit, hwirq;
+
+ raw_spin_lock(&desc->lock);
+
+ 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);
+ }
+ }
+
+ irqchip->irq_ack(&desc->irq_data);
+
+ raw_spin_unlock(&desc->lock);
+}
+
+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_ack(struct irq_data *data)
+{
+ struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
+ int hwirq;
+
+ hwirq = data->hwirq + PCIE_INTX_SHIFT;
+ writel(1 << hwirq, port->base + PCIE_INT_STATUS_REG);
+}
+
+static void mtk_intx_mask(struct irq_data *data)
+{
+ struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
+ int 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);
+ int val, hwirq;
+
+ /**
+ * As an emulated level irq, this interrupt status will be remained
+ * until receive the corresponding message of de-assert, hence that
+ * the status can only be cleared at this point.
+ */
+ hwirq = data->hwirq + PCIE_INTX_SHIFT;
+ writel(1 << hwirq, port->base + PCIE_INT_STATUS_REG);
+
+ val = readl(port->base + PCIE_INT_ENABLE_REG);
+ val |= 1 << (data->hwirq + PCIE_INTX_SHIFT);
+ writel(val, port->base + PCIE_INT_ENABLE_REG);
+}
+
+static struct irq_chip mtk_intx_irq_chip = {
+ .irq_ack = mtk_intx_ack,
+ .irq_mask = mtk_intx_mask,
+ .irq_unmask = mtk_intx_unmask,
+ .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_level_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, val, ret;
+
+ /* Setup INTx */
+ intc_node = of_get_child_by_name(node, "legacy-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;
+
+ 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->hwirq = i;
+ 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 < 0) {
+ 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)
+{
+ 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)
+ 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;
+ u32 virq;
+ u32 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)
+{
+ struct device *dev = port->dev;
+ struct device_node *np = dev->of_node;
+ int i;
+
+ port->num_clks = of_clk_get_parent_count(np);
+ if (port->num_clks == 0) {
+ dev_notice(dev, "pcie clock is not found\n");
+ return -EINVAL;
+ }
+
+ port->clks = devm_kzalloc(dev, port->num_clks, GFP_KERNEL);
+ if (!port->clks)
+ return -ENOMEM;
+
+ for (i = 0; i < port->num_clks; i++) {
+ struct clk *clk;
+ int ret;
+
+ clk = of_clk_get(np, i);
+ if (IS_ERR(clk)) {
+ while (--i >= 0)
+ clk_put(port->clks[i]);
+ return PTR_ERR(clk);
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret < 0) {
+ while (--i >= 0) {
+ clk_disable_unprepare(port->clks[i]);
+ clk_put(port->clks[i]);
+ }
+ clk_put(clk);
+
+ return ret;
+ }
+
+ port->clks[i] = clk;
+ }
+
+ return 0;
+}
+
+static int mtk_pcie_disable_clk(struct mtk_pcie_port *port)
+{
+ int i;
+
+ if (port->num_clks == 0)
+ return 0;
+
+ for (i = 0; i < port->num_clks; i++) {
+ clk_disable_unprepare(port->clks[i]);
+ clk_put(port->clks[i]);
+ }
+
+ port->num_clks = 0;
+
+ 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(dev, "phy-rst");
+ if (PTR_ERR(port->phy_reset) == -EPROBE_DEFER)
+ return PTR_ERR(port->phy_reset);
+
+ reset_control_deassert(port->phy_reset);
+
+ /* phy power on and enable pipe clock */
+ port->phy = devm_phy_optional_get(dev, "pcie-phy");
+ if (IS_ERR(port->phy))
+ port->phy = NULL;
+
+ err = phy_init(port->phy);
+ if (err) {
+ dev_notice(dev, "failed to initialize pcie phy\n");
+ return -ENODEV;
+ }
+
+ err = phy_power_on(port->phy);
+ if (err) {
+ dev_notice(dev, "failed to power on pcie phy\n");
+ goto err_phy_on;
+ }
+
+ port->mac_reset = devm_reset_control_get_optional(dev, "mac-rst");
+ if (PTR_ERR(port->mac_reset) == -EPROBE_DEFER)
+ return PTR_ERR(port->mac_reset);
+
+ 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);
+ phy_power_off(port->phy);
+err_phy_on:
+ phy_exit(port->phy);
+ reset_control_assert(port->phy_reset);
+
+ return -EBUSY;
+}
+
+static void mtk_pcie_power_down(struct mtk_pcie_port *port)
+{
+ phy_power_off(port->phy);
+ phy_exit(port->phy);
+
+ mtk_pcie_disable_clk(port);
+
+ pm_runtime_put_sync(port->dev);
+ pm_runtime_disable(port->dev);
+}
+
+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;
+
+ err = mtk_pcie_setup_irq(port, dev->of_node);
+ if (err)
+ return err;
+
+ /* Try link up */
+ err = mtk_pcie_startup_port(port);
+ if (err) {
+ dev_notice(dev, "PCIe link down\n");
+ mtk_pcie_power_down(port);
+ return err;
+ }
+
+ dev_info(dev, "PCIe link up success!\n");
+
+ return 0;
+}
+
+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->dev.parent = port->dev;
+ host->ops = &mtk_pcie_ops;
+ host->sysdata = port;
+
+ err = pci_host_probe(host);
+ if (err) {
+ mtk_pcie_power_down(port);
+ 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_stop_root_bus(host->bus);
+ pci_remove_root_bus(host->bus);
+
+ 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)
+{
+ int 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 i, err, val;
+
+ if (port->is_suspended)
+ return 0;
+
+ /* Trigger link to L2 state */
+ err = mtk_pcie_turn_off_link(port);
+ if (err) {
+ dev_notice(port->dev, "can not enter L2 state\n");
+ 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");
+
+power_off:
+ phy_power_off(port->phy);
+
+ for (i = 0; i < port->num_clks; i++)
+ clk_disable_unprepare(port->clks[i]);
+
+ pm_runtime_put_sync(port->dev);
+
+ 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 i, err;
+
+ if (!port->is_suspended)
+ return 0;
+
+ phy_power_on(port->phy);
+
+ pm_runtime_get_sync(port->dev);
+
+ for (i = 0; i < port->num_clks; i++) {
+ err = clk_prepare_enable(port->clks[i]);
+ if (err < 0) {
+ while (--i >= 0)
+ clk_disable_unprepare(port->clks[i]);
+ 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");
+
+ 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,gen3-pcie" },
+ { .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,
+ .suppress_bind_attrs = true,
+ .pm = &mtk_pcie_pm_ops,
+ },
+};
+
+module_platform_driver(mtk_pcie_driver);
+MODULE_LICENSE("GPL v2");
--
2.25.1