diff options
Diffstat (limited to 'drivers/pci/controller/pcie-mediatek.c')
| -rw-r--r-- | drivers/pci/controller/pcie-mediatek.c | 1257 |
1 files changed, 1257 insertions, 0 deletions
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c new file mode 100644 index 000000000..11bdef206 --- /dev/null +++ b/drivers/pci/controller/pcie-mediatek.c @@ -0,0 +1,1257 @@ +// 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_find_property(dev->of_node, "interrupt-names", NULL)) + 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 int 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); + + return 0; +} + +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 = 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_LICENSE("GPL v2"); |