// SPDX-License-Identifier: GPL-2.0+ /* * Rockchip AXI PCIe host controller driver * * Copyright (c) 2016 Rockchip, Inc. * * Author: Shawn Lin * Wenrui Li * * Bits taken from Synopsys DesignWare Host controller driver and * ARM PCI Host generic driver. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * The upper 16 bits of PCIE_CLIENT_CONFIG are a write mask for the lower 16 * bits. This allows atomic updates of the register without locking. */ #define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val)) #define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val) #define ENCODE_LANES(x) ((((x) >> 1) & 3) << 4) #define MAX_LANE_NUM 4 #define PCIE_CLIENT_BASE 0x0 #define PCIE_CLIENT_CONFIG (PCIE_CLIENT_BASE + 0x00) #define PCIE_CLIENT_CONF_ENABLE HIWORD_UPDATE_BIT(0x0001) #define PCIE_CLIENT_LINK_TRAIN_ENABLE HIWORD_UPDATE_BIT(0x0002) #define PCIE_CLIENT_ARI_ENABLE HIWORD_UPDATE_BIT(0x0008) #define PCIE_CLIENT_CONF_LANE_NUM(x) HIWORD_UPDATE(0x0030, ENCODE_LANES(x)) #define PCIE_CLIENT_MODE_RC HIWORD_UPDATE_BIT(0x0040) #define PCIE_CLIENT_GEN_SEL_1 HIWORD_UPDATE(0x0080, 0) #define PCIE_CLIENT_GEN_SEL_2 HIWORD_UPDATE_BIT(0x0080) #define PCIE_CLIENT_DEBUG_OUT_0 (PCIE_CLIENT_BASE + 0x3c) #define PCIE_CLIENT_DEBUG_LTSSM_MASK GENMASK(5, 0) #define PCIE_CLIENT_DEBUG_LTSSM_L1 0x18 #define PCIE_CLIENT_DEBUG_LTSSM_L2 0x19 #define PCIE_CLIENT_BASIC_STATUS1 (PCIE_CLIENT_BASE + 0x48) #define PCIE_CLIENT_LINK_STATUS_UP 0x00300000 #define PCIE_CLIENT_LINK_STATUS_MASK 0x00300000 #define PCIE_CLIENT_INT_MASK (PCIE_CLIENT_BASE + 0x4c) #define PCIE_CLIENT_INT_STATUS (PCIE_CLIENT_BASE + 0x50) #define PCIE_CLIENT_INTR_MASK GENMASK(8, 5) #define PCIE_CLIENT_INTR_SHIFT 5 #define PCIE_CLIENT_INT_LEGACY_DONE BIT(15) #define PCIE_CLIENT_INT_MSG BIT(14) #define PCIE_CLIENT_INT_HOT_RST BIT(13) #define PCIE_CLIENT_INT_DPA BIT(12) #define PCIE_CLIENT_INT_FATAL_ERR BIT(11) #define PCIE_CLIENT_INT_NFATAL_ERR BIT(10) #define PCIE_CLIENT_INT_CORR_ERR BIT(9) #define PCIE_CLIENT_INT_INTD BIT(8) #define PCIE_CLIENT_INT_INTC BIT(7) #define PCIE_CLIENT_INT_INTB BIT(6) #define PCIE_CLIENT_INT_INTA BIT(5) #define PCIE_CLIENT_INT_LOCAL BIT(4) #define PCIE_CLIENT_INT_UDMA BIT(3) #define PCIE_CLIENT_INT_PHY BIT(2) #define PCIE_CLIENT_INT_HOT_PLUG BIT(1) #define PCIE_CLIENT_INT_PWR_STCG BIT(0) #define PCIE_CLIENT_INT_LEGACY \ (PCIE_CLIENT_INT_INTA | PCIE_CLIENT_INT_INTB | \ PCIE_CLIENT_INT_INTC | PCIE_CLIENT_INT_INTD) #define PCIE_CLIENT_INT_CLI \ (PCIE_CLIENT_INT_CORR_ERR | PCIE_CLIENT_INT_NFATAL_ERR | \ PCIE_CLIENT_INT_FATAL_ERR | PCIE_CLIENT_INT_DPA | \ PCIE_CLIENT_INT_HOT_RST | PCIE_CLIENT_INT_MSG | \ PCIE_CLIENT_INT_LEGACY_DONE | PCIE_CLIENT_INT_LEGACY | \ PCIE_CLIENT_INT_PHY) #define PCIE_CORE_CTRL_MGMT_BASE 0x900000 #define PCIE_CORE_CTRL (PCIE_CORE_CTRL_MGMT_BASE + 0x000) #define PCIE_CORE_PL_CONF_SPEED_5G 0x00000008 #define PCIE_CORE_PL_CONF_SPEED_MASK 0x00000018 #define PCIE_CORE_PL_CONF_LANE_MASK 0x00000006 #define PCIE_CORE_PL_CONF_LANE_SHIFT 1 #define PCIE_CORE_CTRL_PLC1 (PCIE_CORE_CTRL_MGMT_BASE + 0x004) #define PCIE_CORE_CTRL_PLC1_FTS_MASK GENMASK(23, 8) #define PCIE_CORE_CTRL_PLC1_FTS_SHIFT 8 #define PCIE_CORE_CTRL_PLC1_FTS_CNT 0xffff #define PCIE_CORE_TXCREDIT_CFG1 (PCIE_CORE_CTRL_MGMT_BASE + 0x020) #define PCIE_CORE_TXCREDIT_CFG1_MUI_MASK 0xFFFF0000 #define PCIE_CORE_TXCREDIT_CFG1_MUI_SHIFT 16 #define PCIE_CORE_TXCREDIT_CFG1_MUI_ENCODE(x) \ (((x) >> 3) << PCIE_CORE_TXCREDIT_CFG1_MUI_SHIFT) #define PCIE_CORE_LANE_MAP (PCIE_CORE_CTRL_MGMT_BASE + 0x200) #define PCIE_CORE_LANE_MAP_MASK 0x0000000f #define PCIE_CORE_LANE_MAP_REVERSE BIT(16) #define PCIE_CORE_INT_STATUS (PCIE_CORE_CTRL_MGMT_BASE + 0x20c) #define PCIE_CORE_INT_PRFPE BIT(0) #define PCIE_CORE_INT_CRFPE BIT(1) #define PCIE_CORE_INT_RRPE BIT(2) #define PCIE_CORE_INT_PRFO BIT(3) #define PCIE_CORE_INT_CRFO BIT(4) #define PCIE_CORE_INT_RT BIT(5) #define PCIE_CORE_INT_RTR BIT(6) #define PCIE_CORE_INT_PE BIT(7) #define PCIE_CORE_INT_MTR BIT(8) #define PCIE_CORE_INT_UCR BIT(9) #define PCIE_CORE_INT_FCE BIT(10) #define PCIE_CORE_INT_CT BIT(11) #define PCIE_CORE_INT_UTC BIT(18) #define PCIE_CORE_INT_MMVC BIT(19) #define PCIE_CORE_CONFIG_VENDOR (PCIE_CORE_CTRL_MGMT_BASE + 0x44) #define PCIE_CORE_INT_MASK (PCIE_CORE_CTRL_MGMT_BASE + 0x210) #define PCIE_RC_BAR_CONF (PCIE_CORE_CTRL_MGMT_BASE + 0x300) #define PCIE_CORE_INT \ (PCIE_CORE_INT_PRFPE | PCIE_CORE_INT_CRFPE | \ PCIE_CORE_INT_RRPE | PCIE_CORE_INT_CRFO | \ PCIE_CORE_INT_RT | PCIE_CORE_INT_RTR | \ PCIE_CORE_INT_PE | PCIE_CORE_INT_MTR | \ PCIE_CORE_INT_UCR | PCIE_CORE_INT_FCE | \ PCIE_CORE_INT_CT | PCIE_CORE_INT_UTC | \ PCIE_CORE_INT_MMVC) #define PCIE_RC_CONFIG_NORMAL_BASE 0x800000 #define PCIE_RC_CONFIG_BASE 0xa00000 #define PCIE_RC_CONFIG_RID_CCR (PCIE_RC_CONFIG_BASE + 0x08) #define PCIE_RC_CONFIG_SCC_SHIFT 16 #define PCIE_RC_CONFIG_DCR (PCIE_RC_CONFIG_BASE + 0xc4) #define PCIE_RC_CONFIG_DCR_CSPL_SHIFT 18 #define PCIE_RC_CONFIG_DCR_CSPL_LIMIT 0xff #define PCIE_RC_CONFIG_DCR_CPLS_SHIFT 26 #define PCIE_RC_CONFIG_DCSR (PCIE_RC_CONFIG_BASE + 0xc8) #define PCIE_RC_CONFIG_DCSR_MPS_MASK GENMASK(7, 5) #define PCIE_RC_CONFIG_DCSR_MPS_256 (0x1 << 5) #define PCIE_RC_CONFIG_LINK_CAP (PCIE_RC_CONFIG_BASE + 0xcc) #define PCIE_RC_CONFIG_LINK_CAP_L0S BIT(10) #define PCIE_RC_CONFIG_LCS (PCIE_RC_CONFIG_BASE + 0xd0) #define PCIE_RC_CONFIG_L1_SUBSTATE_CTRL2 (PCIE_RC_CONFIG_BASE + 0x90c) #define PCIE_RC_CONFIG_THP_CAP (PCIE_RC_CONFIG_BASE + 0x274) #define PCIE_RC_CONFIG_THP_CAP_NEXT_MASK GENMASK(31, 20) #define PCIE_CORE_AXI_CONF_BASE 0xc00000 #define PCIE_CORE_OB_REGION_ADDR0 (PCIE_CORE_AXI_CONF_BASE + 0x0) #define PCIE_CORE_OB_REGION_ADDR0_NUM_BITS 0x3f #define PCIE_CORE_OB_REGION_ADDR0_LO_ADDR 0xffffff00 #define PCIE_CORE_OB_REGION_ADDR1 (PCIE_CORE_AXI_CONF_BASE + 0x4) #define PCIE_CORE_OB_REGION_DESC0 (PCIE_CORE_AXI_CONF_BASE + 0x8) #define PCIE_CORE_OB_REGION_DESC1 (PCIE_CORE_AXI_CONF_BASE + 0xc) #define PCIE_CORE_AXI_INBOUND_BASE 0xc00800 #define PCIE_RP_IB_ADDR0 (PCIE_CORE_AXI_INBOUND_BASE + 0x0) #define PCIE_CORE_IB_REGION_ADDR0_NUM_BITS 0x3f #define PCIE_CORE_IB_REGION_ADDR0_LO_ADDR 0xffffff00 #define PCIE_RP_IB_ADDR1 (PCIE_CORE_AXI_INBOUND_BASE + 0x4) /* Size of one AXI Region (not Region 0) */ #define AXI_REGION_SIZE BIT(20) /* Size of Region 0, equal to sum of sizes of other regions */ #define AXI_REGION_0_SIZE (32 * (0x1 << 20)) #define OB_REG_SIZE_SHIFT 5 #define IB_ROOT_PORT_REG_SIZE_SHIFT 3 #define AXI_WRAPPER_IO_WRITE 0x6 #define AXI_WRAPPER_MEM_WRITE 0x2 #define AXI_WRAPPER_TYPE0_CFG 0xa #define AXI_WRAPPER_TYPE1_CFG 0xb #define AXI_WRAPPER_NOR_MSG 0xc #define MAX_AXI_IB_ROOTPORT_REGION_NUM 3 #define MIN_AXI_ADDR_BITS_PASSED 8 #define PCIE_RC_SEND_PME_OFF 0x11960 #define ROCKCHIP_VENDOR_ID 0x1d87 #define PCIE_ECAM_BUS(x) (((x) & 0xff) << 20) #define PCIE_ECAM_DEV(x) (((x) & 0x1f) << 15) #define PCIE_ECAM_FUNC(x) (((x) & 0x7) << 12) #define PCIE_ECAM_REG(x) (((x) & 0xfff) << 0) #define PCIE_ECAM_ADDR(bus, dev, func, reg) \ (PCIE_ECAM_BUS(bus) | PCIE_ECAM_DEV(dev) | \ PCIE_ECAM_FUNC(func) | PCIE_ECAM_REG(reg)) #define PCIE_LINK_IS_L2(x) \ (((x) & PCIE_CLIENT_DEBUG_LTSSM_MASK) == PCIE_CLIENT_DEBUG_LTSSM_L2) #define PCIE_LINK_UP(x) \ (((x) & PCIE_CLIENT_LINK_STATUS_MASK) == PCIE_CLIENT_LINK_STATUS_UP) #define PCIE_LINK_IS_GEN2(x) \ (((x) & PCIE_CORE_PL_CONF_SPEED_MASK) == PCIE_CORE_PL_CONF_SPEED_5G) #define RC_REGION_0_ADDR_TRANS_H 0x00000000 #define RC_REGION_0_ADDR_TRANS_L 0x00000000 #define RC_REGION_0_PASS_BITS (25 - 1) #define RC_REGION_0_TYPE_MASK GENMASK(3, 0) #define MAX_AXI_WRAPPER_REGION_NUM 33 struct rockchip_pcie { void __iomem *reg_base; /* DT axi-base */ void __iomem *apb_base; /* DT apb-base */ bool legacy_phy; struct phy *phys[MAX_LANE_NUM]; struct reset_control *core_rst; struct reset_control *mgmt_rst; struct reset_control *mgmt_sticky_rst; struct reset_control *pipe_rst; struct reset_control *pm_rst; struct reset_control *aclk_rst; struct reset_control *pclk_rst; struct clk *aclk_pcie; struct clk *aclk_perf_pcie; struct clk *hclk_pcie; struct clk *clk_pcie_pm; struct regulator *vpcie12v; /* 12V power supply */ struct regulator *vpcie3v3; /* 3.3V power supply */ struct regulator *vpcie1v8; /* 1.8V power supply */ struct regulator *vpcie0v9; /* 0.9V power supply */ struct gpio_desc *ep_gpio; u32 lanes; u8 lanes_map; u8 root_bus_nr; int link_gen; struct device *dev; struct irq_domain *irq_domain; int offset; struct pci_bus *root_bus; struct resource *io; phys_addr_t io_bus_addr; u32 io_size; void __iomem *msg_region; u32 mem_size; phys_addr_t msg_bus_addr; phys_addr_t mem_bus_addr; }; static u32 rockchip_pcie_read(struct rockchip_pcie *rockchip, u32 reg) { return readl(rockchip->apb_base + reg); } static void rockchip_pcie_write(struct rockchip_pcie *rockchip, u32 val, u32 reg) { writel(val, rockchip->apb_base + reg); } static void rockchip_pcie_enable_bw_int(struct rockchip_pcie *rockchip) { u32 status; status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS); status |= (PCI_EXP_LNKCTL_LBMIE | PCI_EXP_LNKCTL_LABIE); rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS); } static void rockchip_pcie_clr_bw_int(struct rockchip_pcie *rockchip) { u32 status; status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS); status |= (PCI_EXP_LNKSTA_LBMS | PCI_EXP_LNKSTA_LABS) << 16; rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS); } static void rockchip_pcie_update_txcredit_mui(struct rockchip_pcie *rockchip) { u32 val; /* Update Tx credit maximum update interval */ val = rockchip_pcie_read(rockchip, PCIE_CORE_TXCREDIT_CFG1); val &= ~PCIE_CORE_TXCREDIT_CFG1_MUI_MASK; val |= PCIE_CORE_TXCREDIT_CFG1_MUI_ENCODE(24000); /* ns */ rockchip_pcie_write(rockchip, val, PCIE_CORE_TXCREDIT_CFG1); } static int rockchip_pcie_valid_device(struct rockchip_pcie *rockchip, struct pci_bus *bus, int dev) { /* access only one slot on each root port */ if (bus->number == rockchip->root_bus_nr && dev > 0) return 0; /* * do not read more than one device on the bus directly attached * to RC's downstream side. */ if (bus->primary == rockchip->root_bus_nr && dev > 0) return 0; return 1; } static u8 rockchip_pcie_lane_map(struct rockchip_pcie *rockchip) { u32 val; u8 map; if (rockchip->legacy_phy) return GENMASK(MAX_LANE_NUM - 1, 0); val = rockchip_pcie_read(rockchip, PCIE_CORE_LANE_MAP); map = val & PCIE_CORE_LANE_MAP_MASK; /* The link may be using a reverse-indexed mapping. */ if (val & PCIE_CORE_LANE_MAP_REVERSE) map = bitrev8(map) >> 4; return map; } static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip, int where, int size, u32 *val) { void __iomem *addr; addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + where; if (!IS_ALIGNED((uintptr_t)addr, size)) { *val = 0; return PCIBIOS_BAD_REGISTER_NUMBER; } if (size == 4) { *val = readl(addr); } else if (size == 2) { *val = readw(addr); } else if (size == 1) { *val = readb(addr); } else { *val = 0; return PCIBIOS_BAD_REGISTER_NUMBER; } return PCIBIOS_SUCCESSFUL; } static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip, int where, int size, u32 val) { u32 mask, tmp, offset; void __iomem *addr; offset = where & ~0x3; addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + offset; if (size == 4) { writel(val, addr); return PCIBIOS_SUCCESSFUL; } mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8)); /* * N.B. This read/modify/write isn't safe in general because it can * corrupt RW1C bits in adjacent registers. But the hardware * doesn't support smaller writes. */ tmp = readl(addr) & mask; tmp |= val << ((where & 0x3) * 8); writel(tmp, addr); return PCIBIOS_SUCCESSFUL; } static void rockchip_pcie_cfg_configuration_accesses( struct rockchip_pcie *rockchip, u32 type) { u32 ob_desc_0; /* Configuration Accesses for region 0 */ rockchip_pcie_write(rockchip, 0x0, PCIE_RC_BAR_CONF); rockchip_pcie_write(rockchip, (RC_REGION_0_ADDR_TRANS_L + RC_REGION_0_PASS_BITS), PCIE_CORE_OB_REGION_ADDR0); rockchip_pcie_write(rockchip, RC_REGION_0_ADDR_TRANS_H, PCIE_CORE_OB_REGION_ADDR1); ob_desc_0 = rockchip_pcie_read(rockchip, PCIE_CORE_OB_REGION_DESC0); ob_desc_0 &= ~(RC_REGION_0_TYPE_MASK); ob_desc_0 |= (type | (0x1 << 23)); rockchip_pcie_write(rockchip, ob_desc_0, PCIE_CORE_OB_REGION_DESC0); rockchip_pcie_write(rockchip, 0x0, PCIE_CORE_OB_REGION_DESC1); } static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip, struct pci_bus *bus, u32 devfn, int where, int size, u32 *val) { u32 busdev; busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where); if (!IS_ALIGNED(busdev, size)) { *val = 0; return PCIBIOS_BAD_REGISTER_NUMBER; } if (bus->parent->number == rockchip->root_bus_nr) rockchip_pcie_cfg_configuration_accesses(rockchip, AXI_WRAPPER_TYPE0_CFG); else rockchip_pcie_cfg_configuration_accesses(rockchip, AXI_WRAPPER_TYPE1_CFG); if (size == 4) { *val = readl(rockchip->reg_base + busdev); } else if (size == 2) { *val = readw(rockchip->reg_base + busdev); } else if (size == 1) { *val = readb(rockchip->reg_base + busdev); } else { *val = 0; return PCIBIOS_BAD_REGISTER_NUMBER; } return PCIBIOS_SUCCESSFUL; } static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip, struct pci_bus *bus, u32 devfn, int where, int size, u32 val) { u32 busdev; busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where); if (!IS_ALIGNED(busdev, size)) return PCIBIOS_BAD_REGISTER_NUMBER; if (bus->parent->number == rockchip->root_bus_nr) rockchip_pcie_cfg_configuration_accesses(rockchip, AXI_WRAPPER_TYPE0_CFG); else rockchip_pcie_cfg_configuration_accesses(rockchip, AXI_WRAPPER_TYPE1_CFG); if (size == 4) writel(val, rockchip->reg_base + busdev); else if (size == 2) writew(val, rockchip->reg_base + busdev); else if (size == 1) writeb(val, rockchip->reg_base + busdev); else return PCIBIOS_BAD_REGISTER_NUMBER; return PCIBIOS_SUCCESSFUL; } static int rockchip_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, int size, u32 *val) { struct rockchip_pcie *rockchip = bus->sysdata; if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn))) { *val = 0xffffffff; return PCIBIOS_DEVICE_NOT_FOUND; } if (bus->number == rockchip->root_bus_nr) return rockchip_pcie_rd_own_conf(rockchip, where, size, val); return rockchip_pcie_rd_other_conf(rockchip, bus, devfn, where, size, val); } static int rockchip_pcie_wr_conf(struct pci_bus *bus, u32 devfn, int where, int size, u32 val) { struct rockchip_pcie *rockchip = bus->sysdata; if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn))) return PCIBIOS_DEVICE_NOT_FOUND; if (bus->number == rockchip->root_bus_nr) return rockchip_pcie_wr_own_conf(rockchip, where, size, val); return rockchip_pcie_wr_other_conf(rockchip, bus, devfn, where, size, val); } static struct pci_ops rockchip_pcie_ops = { .read = rockchip_pcie_rd_conf, .write = rockchip_pcie_wr_conf, }; static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip) { int curr; u32 status, scale, power; if (IS_ERR(rockchip->vpcie3v3)) return; /* * Set RC's captured slot power limit and scale if * vpcie3v3 available. The default values are both zero * which means the software should set these two according * to the actual power supply. */ curr = regulator_get_current_limit(rockchip->vpcie3v3); if (curr <= 0) return; scale = 3; /* 0.001x */ curr = curr / 1000; /* convert to mA */ power = (curr * 3300) / 1000; /* milliwatt */ while (power > PCIE_RC_CONFIG_DCR_CSPL_LIMIT) { if (!scale) { dev_warn(rockchip->dev, "invalid power supply\n"); return; } scale--; power = power / 10; } status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCR); status |= (power << PCIE_RC_CONFIG_DCR_CSPL_SHIFT) | (scale << PCIE_RC_CONFIG_DCR_CPLS_SHIFT); rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR); } /** * rockchip_pcie_init_port - Initialize hardware * @rockchip: PCIe port information */ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; int err, i; u32 status; gpiod_set_value_cansleep(rockchip->ep_gpio, 0); err = reset_control_assert(rockchip->aclk_rst); if (err) { dev_err(dev, "assert aclk_rst err %d\n", err); return err; } err = reset_control_assert(rockchip->pclk_rst); if (err) { dev_err(dev, "assert pclk_rst err %d\n", err); return err; } err = reset_control_assert(rockchip->pm_rst); if (err) { dev_err(dev, "assert pm_rst err %d\n", err); return err; } for (i = 0; i < MAX_LANE_NUM; i++) { err = phy_init(rockchip->phys[i]); if (err) { dev_err(dev, "init phy%d err %d\n", i, err); goto err_exit_phy; } } err = reset_control_assert(rockchip->core_rst); if (err) { dev_err(dev, "assert core_rst err %d\n", err); goto err_exit_phy; } err = reset_control_assert(rockchip->mgmt_rst); if (err) { dev_err(dev, "assert mgmt_rst err %d\n", err); goto err_exit_phy; } err = reset_control_assert(rockchip->mgmt_sticky_rst); if (err) { dev_err(dev, "assert mgmt_sticky_rst err %d\n", err); goto err_exit_phy; } err = reset_control_assert(rockchip->pipe_rst); if (err) { dev_err(dev, "assert pipe_rst err %d\n", err); goto err_exit_phy; } udelay(10); err = reset_control_deassert(rockchip->pm_rst); if (err) { dev_err(dev, "deassert pm_rst err %d\n", err); goto err_exit_phy; } err = reset_control_deassert(rockchip->aclk_rst); if (err) { dev_err(dev, "deassert aclk_rst err %d\n", err); goto err_exit_phy; } err = reset_control_deassert(rockchip->pclk_rst); if (err) { dev_err(dev, "deassert pclk_rst err %d\n", err); goto err_exit_phy; } if (rockchip->link_gen == 2) rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_2, PCIE_CLIENT_CONFIG); else rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_1, PCIE_CLIENT_CONFIG); rockchip_pcie_write(rockchip, PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_LINK_TRAIN_ENABLE | PCIE_CLIENT_ARI_ENABLE | PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes) | PCIE_CLIENT_MODE_RC, PCIE_CLIENT_CONFIG); for (i = 0; i < MAX_LANE_NUM; i++) { err = phy_power_on(rockchip->phys[i]); if (err) { dev_err(dev, "power on phy%d err %d\n", i, err); goto err_power_off_phy; } } /* * Please don't reorder the deassert sequence of the following * four reset pins. */ err = reset_control_deassert(rockchip->mgmt_sticky_rst); if (err) { dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err); goto err_power_off_phy; } err = reset_control_deassert(rockchip->core_rst); if (err) { dev_err(dev, "deassert core_rst err %d\n", err); goto err_power_off_phy; } err = reset_control_deassert(rockchip->mgmt_rst); if (err) { dev_err(dev, "deassert mgmt_rst err %d\n", err); goto err_power_off_phy; } err = reset_control_deassert(rockchip->pipe_rst); if (err) { dev_err(dev, "deassert pipe_rst err %d\n", err); goto err_power_off_phy; } /* Fix the transmitted FTS count desired to exit from L0s. */ status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1); status = (status & ~PCIE_CORE_CTRL_PLC1_FTS_MASK) | (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT); rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1); rockchip_pcie_set_power_limit(rockchip); /* Set RC's clock architecture as common clock */ status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS); status |= PCI_EXP_LNKSTA_SLC << 16; rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS); /* Set RC's RCB to 128 */ status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS); status |= PCI_EXP_LNKCTL_RCB; rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS); /* Enable Gen1 training */ rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE, PCIE_CLIENT_CONFIG); gpiod_set_value_cansleep(rockchip->ep_gpio, 1); /* 500ms timeout value should be enough for Gen1/2 training */ err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_BASIC_STATUS1, status, PCIE_LINK_UP(status), 20, 500 * USEC_PER_MSEC); if (err) { dev_err(dev, "PCIe link training gen1 timeout!\n"); goto err_power_off_phy; } if (rockchip->link_gen == 2) { /* * Enable retrain for gen2. This should be configured only after * gen1 finished. */ status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS); status |= PCI_EXP_LNKCTL_RL; rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS); err = readl_poll_timeout(rockchip->apb_base + PCIE_CORE_CTRL, status, PCIE_LINK_IS_GEN2(status), 20, 500 * USEC_PER_MSEC); if (err) dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n"); } /* Check the final link width from negotiated lane counter from MGMT */ status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL); status = 0x1 << ((status & PCIE_CORE_PL_CONF_LANE_MASK) >> PCIE_CORE_PL_CONF_LANE_SHIFT); dev_dbg(dev, "current link width is x%d\n", status); /* Power off unused lane(s) */ rockchip->lanes_map = rockchip_pcie_lane_map(rockchip); for (i = 0; i < MAX_LANE_NUM; i++) { if (!(rockchip->lanes_map & BIT(i))) { dev_dbg(dev, "idling lane %d\n", i); phy_power_off(rockchip->phys[i]); } } rockchip_pcie_write(rockchip, ROCKCHIP_VENDOR_ID, PCIE_CORE_CONFIG_VENDOR); rockchip_pcie_write(rockchip, PCI_CLASS_BRIDGE_PCI << PCIE_RC_CONFIG_SCC_SHIFT, PCIE_RC_CONFIG_RID_CCR); /* Clear THP cap's next cap pointer to remove L1 substate cap */ status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_THP_CAP); status &= ~PCIE_RC_CONFIG_THP_CAP_NEXT_MASK; rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_THP_CAP); /* Clear L0s from RC's link cap */ if (of_property_read_bool(dev->of_node, "aspm-no-l0s")) { status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LINK_CAP); status &= ~PCIE_RC_CONFIG_LINK_CAP_L0S; rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LINK_CAP); } status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCSR); status &= ~PCIE_RC_CONFIG_DCSR_MPS_MASK; status |= PCIE_RC_CONFIG_DCSR_MPS_256; rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCSR); return 0; err_power_off_phy: while (i--) phy_power_off(rockchip->phys[i]); i = MAX_LANE_NUM; err_exit_phy: while (i--) phy_exit(rockchip->phys[i]); return err; } static void rockchip_pcie_deinit_phys(struct rockchip_pcie *rockchip) { int i; for (i = 0; i < MAX_LANE_NUM; i++) { /* inactive lanes are already powered off */ if (rockchip->lanes_map & BIT(i)) phy_power_off(rockchip->phys[i]); phy_exit(rockchip->phys[i]); } } static irqreturn_t rockchip_pcie_subsys_irq_handler(int irq, void *arg) { struct rockchip_pcie *rockchip = arg; struct device *dev = rockchip->dev; u32 reg; u32 sub_reg; reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS); if (reg & PCIE_CLIENT_INT_LOCAL) { dev_dbg(dev, "local interrupt received\n"); sub_reg = rockchip_pcie_read(rockchip, PCIE_CORE_INT_STATUS); if (sub_reg & PCIE_CORE_INT_PRFPE) dev_dbg(dev, "parity error detected while reading from the PNP receive FIFO RAM\n"); if (sub_reg & PCIE_CORE_INT_CRFPE) dev_dbg(dev, "parity error detected while reading from the Completion Receive FIFO RAM\n"); if (sub_reg & PCIE_CORE_INT_RRPE) dev_dbg(dev, "parity error detected while reading from replay buffer RAM\n"); if (sub_reg & PCIE_CORE_INT_PRFO) dev_dbg(dev, "overflow occurred in the PNP receive FIFO\n"); if (sub_reg & PCIE_CORE_INT_CRFO) dev_dbg(dev, "overflow occurred in the completion receive FIFO\n"); if (sub_reg & PCIE_CORE_INT_RT) dev_dbg(dev, "replay timer timed out\n"); if (sub_reg & PCIE_CORE_INT_RTR) dev_dbg(dev, "replay timer rolled over after 4 transmissions of the same TLP\n"); if (sub_reg & PCIE_CORE_INT_PE) dev_dbg(dev, "phy error detected on receive side\n"); if (sub_reg & PCIE_CORE_INT_MTR) dev_dbg(dev, "malformed TLP received from the link\n"); if (sub_reg & PCIE_CORE_INT_UCR) dev_dbg(dev, "malformed TLP received from the link\n"); if (sub_reg & PCIE_CORE_INT_FCE) dev_dbg(dev, "an error was observed in the flow control advertisements from the other side\n"); if (sub_reg & PCIE_CORE_INT_CT) dev_dbg(dev, "a request timed out waiting for completion\n"); if (sub_reg & PCIE_CORE_INT_UTC) dev_dbg(dev, "unmapped TC error\n"); if (sub_reg & PCIE_CORE_INT_MMVC) dev_dbg(dev, "MSI mask register changes\n"); rockchip_pcie_write(rockchip, sub_reg, PCIE_CORE_INT_STATUS); } else if (reg & PCIE_CLIENT_INT_PHY) { dev_dbg(dev, "phy link changes\n"); rockchip_pcie_update_txcredit_mui(rockchip); rockchip_pcie_clr_bw_int(rockchip); } rockchip_pcie_write(rockchip, reg & PCIE_CLIENT_INT_LOCAL, PCIE_CLIENT_INT_STATUS); return IRQ_HANDLED; } static irqreturn_t rockchip_pcie_client_irq_handler(int irq, void *arg) { struct rockchip_pcie *rockchip = arg; struct device *dev = rockchip->dev; u32 reg; reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS); if (reg & PCIE_CLIENT_INT_LEGACY_DONE) dev_dbg(dev, "legacy done interrupt received\n"); if (reg & PCIE_CLIENT_INT_MSG) dev_dbg(dev, "message done interrupt received\n"); if (reg & PCIE_CLIENT_INT_HOT_RST) dev_dbg(dev, "hot reset interrupt received\n"); if (reg & PCIE_CLIENT_INT_DPA) dev_dbg(dev, "dpa interrupt received\n"); if (reg & PCIE_CLIENT_INT_FATAL_ERR) dev_dbg(dev, "fatal error interrupt received\n"); if (reg & PCIE_CLIENT_INT_NFATAL_ERR) dev_dbg(dev, "no fatal error interrupt received\n"); if (reg & PCIE_CLIENT_INT_CORR_ERR) dev_dbg(dev, "correctable error interrupt received\n"); if (reg & PCIE_CLIENT_INT_PHY) dev_dbg(dev, "phy interrupt received\n"); rockchip_pcie_write(rockchip, reg & (PCIE_CLIENT_INT_LEGACY_DONE | PCIE_CLIENT_INT_MSG | PCIE_CLIENT_INT_HOT_RST | PCIE_CLIENT_INT_DPA | PCIE_CLIENT_INT_FATAL_ERR | PCIE_CLIENT_INT_NFATAL_ERR | PCIE_CLIENT_INT_CORR_ERR | PCIE_CLIENT_INT_PHY), PCIE_CLIENT_INT_STATUS); return IRQ_HANDLED; } static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc); struct device *dev = rockchip->dev; u32 reg; u32 hwirq; u32 virq; chained_irq_enter(chip, desc); reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS); reg = (reg & PCIE_CLIENT_INTR_MASK) >> PCIE_CLIENT_INTR_SHIFT; while (reg) { hwirq = ffs(reg) - 1; reg &= ~BIT(hwirq); virq = irq_find_mapping(rockchip->irq_domain, hwirq); if (virq) generic_handle_irq(virq); else dev_err(dev, "unexpected IRQ, INT%d\n", hwirq); } chained_irq_exit(chip, desc); } static int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; struct phy *phy; char *name; u32 i; phy = devm_phy_get(dev, "pcie-phy"); if (!IS_ERR(phy)) { rockchip->legacy_phy = true; rockchip->phys[0] = phy; dev_warn(dev, "legacy phy model is deprecated!\n"); return 0; } if (PTR_ERR(phy) == -EPROBE_DEFER) return PTR_ERR(phy); dev_dbg(dev, "missing legacy phy; search for per-lane PHY\n"); for (i = 0; i < MAX_LANE_NUM; i++) { name = kasprintf(GFP_KERNEL, "pcie-phy-%u", i); if (!name) return -ENOMEM; phy = devm_of_phy_get(dev, dev->of_node, name); kfree(name); if (IS_ERR(phy)) { if (PTR_ERR(phy) != -EPROBE_DEFER) dev_err(dev, "missing phy for lane %d: %ld\n", i, PTR_ERR(phy)); return PTR_ERR(phy); } rockchip->phys[i] = phy; } return 0; } static int rockchip_pcie_setup_irq(struct rockchip_pcie *rockchip) { int irq, err; struct device *dev = rockchip->dev; struct platform_device *pdev = to_platform_device(dev); irq = platform_get_irq_byname(pdev, "sys"); if (irq < 0) { dev_err(dev, "missing sys IRQ resource\n"); return irq; } err = devm_request_irq(dev, irq, rockchip_pcie_subsys_irq_handler, IRQF_SHARED, "pcie-sys", rockchip); if (err) { dev_err(dev, "failed to request PCIe subsystem IRQ\n"); return err; } irq = platform_get_irq_byname(pdev, "legacy"); if (irq < 0) { dev_err(dev, "missing legacy IRQ resource\n"); return irq; } irq_set_chained_handler_and_data(irq, rockchip_pcie_legacy_int_handler, rockchip); irq = platform_get_irq_byname(pdev, "client"); if (irq < 0) { dev_err(dev, "missing client IRQ resource\n"); return irq; } err = devm_request_irq(dev, irq, rockchip_pcie_client_irq_handler, IRQF_SHARED, "pcie-client", rockchip); if (err) { dev_err(dev, "failed to request PCIe client IRQ\n"); return err; } return 0; } /** * rockchip_pcie_parse_dt - Parse Device Tree * @rockchip: PCIe port information * * Return: '0' on success and error value on failure */ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; struct platform_device *pdev = to_platform_device(dev); struct device_node *node = dev->of_node; struct resource *regs; int err; regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "axi-base"); rockchip->reg_base = devm_pci_remap_cfg_resource(dev, regs); if (IS_ERR(rockchip->reg_base)) return PTR_ERR(rockchip->reg_base); regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "apb-base"); rockchip->apb_base = devm_ioremap_resource(dev, regs); if (IS_ERR(rockchip->apb_base)) return PTR_ERR(rockchip->apb_base); err = rockchip_pcie_get_phys(rockchip); if (err) return err; rockchip->lanes = 1; err = of_property_read_u32(node, "num-lanes", &rockchip->lanes); if (!err && (rockchip->lanes == 0 || rockchip->lanes == 3 || rockchip->lanes > 4)) { dev_warn(dev, "invalid num-lanes, default to use one lane\n"); rockchip->lanes = 1; } rockchip->link_gen = of_pci_get_max_link_speed(node); if (rockchip->link_gen < 0 || rockchip->link_gen > 2) rockchip->link_gen = 2; rockchip->core_rst = devm_reset_control_get_exclusive(dev, "core"); if (IS_ERR(rockchip->core_rst)) { if (PTR_ERR(rockchip->core_rst) != -EPROBE_DEFER) dev_err(dev, "missing core reset property in node\n"); return PTR_ERR(rockchip->core_rst); } rockchip->mgmt_rst = devm_reset_control_get_exclusive(dev, "mgmt"); if (IS_ERR(rockchip->mgmt_rst)) { if (PTR_ERR(rockchip->mgmt_rst) != -EPROBE_DEFER) dev_err(dev, "missing mgmt reset property in node\n"); return PTR_ERR(rockchip->mgmt_rst); } rockchip->mgmt_sticky_rst = devm_reset_control_get_exclusive(dev, "mgmt-sticky"); if (IS_ERR(rockchip->mgmt_sticky_rst)) { if (PTR_ERR(rockchip->mgmt_sticky_rst) != -EPROBE_DEFER) dev_err(dev, "missing mgmt-sticky reset property in node\n"); return PTR_ERR(rockchip->mgmt_sticky_rst); } rockchip->pipe_rst = devm_reset_control_get_exclusive(dev, "pipe"); if (IS_ERR(rockchip->pipe_rst)) { if (PTR_ERR(rockchip->pipe_rst) != -EPROBE_DEFER) dev_err(dev, "missing pipe reset property in node\n"); return PTR_ERR(rockchip->pipe_rst); } rockchip->pm_rst = devm_reset_control_get_exclusive(dev, "pm"); if (IS_ERR(rockchip->pm_rst)) { if (PTR_ERR(rockchip->pm_rst) != -EPROBE_DEFER) dev_err(dev, "missing pm reset property in node\n"); return PTR_ERR(rockchip->pm_rst); } rockchip->pclk_rst = devm_reset_control_get_exclusive(dev, "pclk"); if (IS_ERR(rockchip->pclk_rst)) { if (PTR_ERR(rockchip->pclk_rst) != -EPROBE_DEFER) dev_err(dev, "missing pclk reset property in node\n"); return PTR_ERR(rockchip->pclk_rst); } rockchip->aclk_rst = devm_reset_control_get_exclusive(dev, "aclk"); if (IS_ERR(rockchip->aclk_rst)) { if (PTR_ERR(rockchip->aclk_rst) != -EPROBE_DEFER) dev_err(dev, "missing aclk reset property in node\n"); return PTR_ERR(rockchip->aclk_rst); } rockchip->ep_gpio = devm_gpiod_get(dev, "ep", GPIOD_OUT_HIGH); if (IS_ERR(rockchip->ep_gpio)) { dev_err(dev, "missing ep-gpios property in node\n"); return PTR_ERR(rockchip->ep_gpio); } rockchip->aclk_pcie = devm_clk_get(dev, "aclk"); if (IS_ERR(rockchip->aclk_pcie)) { dev_err(dev, "aclk clock not found\n"); return PTR_ERR(rockchip->aclk_pcie); } rockchip->aclk_perf_pcie = devm_clk_get(dev, "aclk-perf"); if (IS_ERR(rockchip->aclk_perf_pcie)) { dev_err(dev, "aclk_perf clock not found\n"); return PTR_ERR(rockchip->aclk_perf_pcie); } rockchip->hclk_pcie = devm_clk_get(dev, "hclk"); if (IS_ERR(rockchip->hclk_pcie)) { dev_err(dev, "hclk clock not found\n"); return PTR_ERR(rockchip->hclk_pcie); } rockchip->clk_pcie_pm = devm_clk_get(dev, "pm"); if (IS_ERR(rockchip->clk_pcie_pm)) { dev_err(dev, "pm clock not found\n"); return PTR_ERR(rockchip->clk_pcie_pm); } err = rockchip_pcie_setup_irq(rockchip); if (err) return err; rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v"); if (IS_ERR(rockchip->vpcie12v)) { if (PTR_ERR(rockchip->vpcie12v) == -EPROBE_DEFER) return -EPROBE_DEFER; dev_info(dev, "no vpcie12v regulator found\n"); } rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3"); if (IS_ERR(rockchip->vpcie3v3)) { if (PTR_ERR(rockchip->vpcie3v3) == -EPROBE_DEFER) return -EPROBE_DEFER; dev_info(dev, "no vpcie3v3 regulator found\n"); } rockchip->vpcie1v8 = devm_regulator_get_optional(dev, "vpcie1v8"); if (IS_ERR(rockchip->vpcie1v8)) { if (PTR_ERR(rockchip->vpcie1v8) == -EPROBE_DEFER) return -EPROBE_DEFER; dev_info(dev, "no vpcie1v8 regulator found\n"); } rockchip->vpcie0v9 = devm_regulator_get_optional(dev, "vpcie0v9"); if (IS_ERR(rockchip->vpcie0v9)) { if (PTR_ERR(rockchip->vpcie0v9) == -EPROBE_DEFER) return -EPROBE_DEFER; dev_info(dev, "no vpcie0v9 regulator found\n"); } return 0; } static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; int err; if (!IS_ERR(rockchip->vpcie12v)) { err = regulator_enable(rockchip->vpcie12v); if (err) { dev_err(dev, "fail to enable vpcie12v regulator\n"); goto err_out; } } if (!IS_ERR(rockchip->vpcie3v3)) { err = regulator_enable(rockchip->vpcie3v3); if (err) { dev_err(dev, "fail to enable vpcie3v3 regulator\n"); goto err_disable_12v; } } if (!IS_ERR(rockchip->vpcie1v8)) { err = regulator_enable(rockchip->vpcie1v8); if (err) { dev_err(dev, "fail to enable vpcie1v8 regulator\n"); goto err_disable_3v3; } } if (!IS_ERR(rockchip->vpcie0v9)) { err = regulator_enable(rockchip->vpcie0v9); if (err) { dev_err(dev, "fail to enable vpcie0v9 regulator\n"); goto err_disable_1v8; } } return 0; err_disable_1v8: if (!IS_ERR(rockchip->vpcie1v8)) regulator_disable(rockchip->vpcie1v8); err_disable_3v3: if (!IS_ERR(rockchip->vpcie3v3)) regulator_disable(rockchip->vpcie3v3); err_disable_12v: if (!IS_ERR(rockchip->vpcie12v)) regulator_disable(rockchip->vpcie12v); err_out: return err; } static void rockchip_pcie_enable_interrupts(struct rockchip_pcie *rockchip) { rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) & (~PCIE_CLIENT_INT_CLI), PCIE_CLIENT_INT_MASK); rockchip_pcie_write(rockchip, (u32)(~PCIE_CORE_INT), PCIE_CORE_INT_MASK); rockchip_pcie_enable_bw_int(rockchip); } static int rockchip_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 = rockchip_pcie_intx_map, }; static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; struct device_node *intc = of_get_next_child(dev->of_node, NULL); if (!intc) { dev_err(dev, "missing child interrupt-controller node\n"); return -EINVAL; } rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX, &intx_domain_ops, rockchip); if (!rockchip->irq_domain) { dev_err(dev, "failed to get a INTx IRQ domain\n"); return -EINVAL; } return 0; } static int rockchip_pcie_prog_ob_atu(struct rockchip_pcie *rockchip, int region_no, int type, u8 num_pass_bits, u32 lower_addr, u32 upper_addr) { u32 ob_addr_0; u32 ob_addr_1; u32 ob_desc_0; u32 aw_offset; if (region_no >= MAX_AXI_WRAPPER_REGION_NUM) return -EINVAL; if (num_pass_bits + 1 < 8) return -EINVAL; if (num_pass_bits > 63) return -EINVAL; if (region_no == 0) { if (AXI_REGION_0_SIZE < (2ULL << num_pass_bits)) return -EINVAL; } if (region_no != 0) { if (AXI_REGION_SIZE < (2ULL << num_pass_bits)) return -EINVAL; } aw_offset = (region_no << OB_REG_SIZE_SHIFT); ob_addr_0 = num_pass_bits & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS; ob_addr_0 |= lower_addr & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR; ob_addr_1 = upper_addr; ob_desc_0 = (1 << 23 | type); rockchip_pcie_write(rockchip, ob_addr_0, PCIE_CORE_OB_REGION_ADDR0 + aw_offset); rockchip_pcie_write(rockchip, ob_addr_1, PCIE_CORE_OB_REGION_ADDR1 + aw_offset); rockchip_pcie_write(rockchip, ob_desc_0, PCIE_CORE_OB_REGION_DESC0 + aw_offset); rockchip_pcie_write(rockchip, 0, PCIE_CORE_OB_REGION_DESC1 + aw_offset); return 0; } static int rockchip_pcie_prog_ib_atu(struct rockchip_pcie *rockchip, int region_no, u8 num_pass_bits, u32 lower_addr, u32 upper_addr) { u32 ib_addr_0; u32 ib_addr_1; u32 aw_offset; if (region_no > MAX_AXI_IB_ROOTPORT_REGION_NUM) return -EINVAL; if (num_pass_bits + 1 < MIN_AXI_ADDR_BITS_PASSED) return -EINVAL; if (num_pass_bits > 63) return -EINVAL; aw_offset = (region_no << IB_ROOT_PORT_REG_SIZE_SHIFT); ib_addr_0 = num_pass_bits & PCIE_CORE_IB_REGION_ADDR0_NUM_BITS; ib_addr_0 |= (lower_addr << 8) & PCIE_CORE_IB_REGION_ADDR0_LO_ADDR; ib_addr_1 = upper_addr; rockchip_pcie_write(rockchip, ib_addr_0, PCIE_RP_IB_ADDR0 + aw_offset); rockchip_pcie_write(rockchip, ib_addr_1, PCIE_RP_IB_ADDR1 + aw_offset); return 0; } static int rockchip_pcie_cfg_atu(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; int offset; int err; int reg_no; rockchip_pcie_cfg_configuration_accesses(rockchip, AXI_WRAPPER_TYPE0_CFG); for (reg_no = 0; reg_no < (rockchip->mem_size >> 20); reg_no++) { err = rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1, AXI_WRAPPER_MEM_WRITE, 20 - 1, rockchip->mem_bus_addr + (reg_no << 20), 0); if (err) { dev_err(dev, "program RC mem outbound ATU failed\n"); return err; } } err = rockchip_pcie_prog_ib_atu(rockchip, 2, 32 - 1, 0x0, 0); if (err) { dev_err(dev, "program RC mem inbound ATU failed\n"); return err; } offset = rockchip->mem_size >> 20; for (reg_no = 0; reg_no < (rockchip->io_size >> 20); reg_no++) { err = rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1 + offset, AXI_WRAPPER_IO_WRITE, 20 - 1, rockchip->io_bus_addr + (reg_no << 20), 0); if (err) { dev_err(dev, "program RC io outbound ATU failed\n"); return err; } } /* assign message regions */ rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1 + offset, AXI_WRAPPER_NOR_MSG, 20 - 1, 0, 0); rockchip->msg_bus_addr = rockchip->mem_bus_addr + ((reg_no + offset) << 20); return err; } static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip) { u32 value; int err; /* send PME_TURN_OFF message */ writel(0x0, rockchip->msg_region + PCIE_RC_SEND_PME_OFF); /* read LTSSM and wait for falling into L2 link state */ err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_DEBUG_OUT_0, value, PCIE_LINK_IS_L2(value), 20, jiffies_to_usecs(5 * HZ)); if (err) { dev_err(rockchip->dev, "PCIe link enter L2 timeout!\n"); return err; } return 0; } static int rockchip_pcie_enable_clocks(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; int err; err = clk_prepare_enable(rockchip->aclk_pcie); if (err) { dev_err(dev, "unable to enable aclk_pcie clock\n"); return err; } err = clk_prepare_enable(rockchip->aclk_perf_pcie); if (err) { dev_err(dev, "unable to enable aclk_perf_pcie clock\n"); goto err_aclk_perf_pcie; } err = clk_prepare_enable(rockchip->hclk_pcie); if (err) { dev_err(dev, "unable to enable hclk_pcie clock\n"); goto err_hclk_pcie; } err = clk_prepare_enable(rockchip->clk_pcie_pm); if (err) { dev_err(dev, "unable to enable clk_pcie_pm clock\n"); goto err_clk_pcie_pm; } return 0; err_clk_pcie_pm: clk_disable_unprepare(rockchip->hclk_pcie); err_hclk_pcie: clk_disable_unprepare(rockchip->aclk_perf_pcie); err_aclk_perf_pcie: clk_disable_unprepare(rockchip->aclk_pcie); return err; } static void rockchip_pcie_disable_clocks(void *data) { struct rockchip_pcie *rockchip = data; clk_disable_unprepare(rockchip->clk_pcie_pm); clk_disable_unprepare(rockchip->hclk_pcie); clk_disable_unprepare(rockchip->aclk_perf_pcie); clk_disable_unprepare(rockchip->aclk_pcie); } static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev) { struct rockchip_pcie *rockchip = dev_get_drvdata(dev); int ret; /* disable core and cli int since we don't need to ack PME_ACK */ rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) | PCIE_CLIENT_INT_CLI, PCIE_CLIENT_INT_MASK); rockchip_pcie_write(rockchip, (u32)PCIE_CORE_INT, PCIE_CORE_INT_MASK); ret = rockchip_pcie_wait_l2(rockchip); if (ret) { rockchip_pcie_enable_interrupts(rockchip); return ret; } rockchip_pcie_deinit_phys(rockchip); rockchip_pcie_disable_clocks(rockchip); if (!IS_ERR(rockchip->vpcie0v9)) regulator_disable(rockchip->vpcie0v9); return ret; } static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev) { struct rockchip_pcie *rockchip = dev_get_drvdata(dev); int err; if (!IS_ERR(rockchip->vpcie0v9)) { err = regulator_enable(rockchip->vpcie0v9); if (err) { dev_err(dev, "fail to enable vpcie0v9 regulator\n"); return err; } } err = rockchip_pcie_enable_clocks(rockchip); if (err) goto err_disable_0v9; err = rockchip_pcie_init_port(rockchip); if (err) goto err_pcie_resume; err = rockchip_pcie_cfg_atu(rockchip); if (err) goto err_err_deinit_port; /* Need this to enter L1 again */ rockchip_pcie_update_txcredit_mui(rockchip); rockchip_pcie_enable_interrupts(rockchip); return 0; err_err_deinit_port: rockchip_pcie_deinit_phys(rockchip); err_pcie_resume: rockchip_pcie_disable_clocks(rockchip); err_disable_0v9: if (!IS_ERR(rockchip->vpcie0v9)) regulator_disable(rockchip->vpcie0v9); return err; } static int rockchip_pcie_probe(struct platform_device *pdev) { struct rockchip_pcie *rockchip; struct device *dev = &pdev->dev; struct pci_bus *bus, *child; struct pci_host_bridge *bridge; struct resource_entry *win; resource_size_t io_base; struct resource *mem; struct resource *io; int err; LIST_HEAD(res); if (!dev->of_node) return -ENODEV; bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rockchip)); if (!bridge) return -ENOMEM; rockchip = pci_host_bridge_priv(bridge); platform_set_drvdata(pdev, rockchip); rockchip->dev = dev; err = rockchip_pcie_parse_dt(rockchip); if (err) return err; err = rockchip_pcie_enable_clocks(rockchip); if (err) return err; err = rockchip_pcie_set_vpcie(rockchip); if (err) { dev_err(dev, "failed to set vpcie regulator\n"); goto err_set_vpcie; } err = rockchip_pcie_init_port(rockchip); if (err) goto err_vpcie; rockchip_pcie_enable_interrupts(rockchip); err = rockchip_pcie_init_irq_domain(rockchip); if (err < 0) goto err_deinit_port; err = of_pci_get_host_bridge_resources(dev, 0, 0xff, &res, &io_base); if (err) goto err_remove_irq_domain; err = devm_request_pci_bus_resources(dev, &res); if (err) goto err_free_res; /* Get the I/O and memory ranges from DT */ resource_list_for_each_entry(win, &res) { switch (resource_type(win->res)) { case IORESOURCE_IO: io = win->res; io->name = "I/O"; rockchip->io_size = resource_size(io); rockchip->io_bus_addr = io->start - win->offset; err = pci_remap_iospace(io, io_base); if (err) { dev_warn(dev, "error %d: failed to map resource %pR\n", err, io); continue; } rockchip->io = io; break; case IORESOURCE_MEM: mem = win->res; mem->name = "MEM"; rockchip->mem_size = resource_size(mem); rockchip->mem_bus_addr = mem->start - win->offset; break; case IORESOURCE_BUS: rockchip->root_bus_nr = win->res->start; break; default: continue; } } err = rockchip_pcie_cfg_atu(rockchip); if (err) goto err_unmap_iospace; rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M); if (!rockchip->msg_region) { err = -ENOMEM; goto err_unmap_iospace; } list_splice_init(&res, &bridge->windows); bridge->dev.parent = dev; bridge->sysdata = rockchip; bridge->busnr = 0; bridge->ops = &rockchip_pcie_ops; bridge->map_irq = of_irq_parse_and_map_pci; bridge->swizzle_irq = pci_common_swizzle; err = pci_scan_root_bus_bridge(bridge); if (err < 0) goto err_unmap_iospace; bus = bridge->bus; rockchip->root_bus = bus; pci_bus_size_bridges(bus); pci_bus_assign_resources(bus); list_for_each_entry(child, &bus->children, node) pcie_bus_configure_settings(child); pci_bus_add_devices(bus); return 0; err_unmap_iospace: pci_unmap_iospace(rockchip->io); err_free_res: pci_free_resource_list(&res); err_remove_irq_domain: irq_domain_remove(rockchip->irq_domain); err_deinit_port: rockchip_pcie_deinit_phys(rockchip); err_vpcie: if (!IS_ERR(rockchip->vpcie12v)) regulator_disable(rockchip->vpcie12v); if (!IS_ERR(rockchip->vpcie3v3)) regulator_disable(rockchip->vpcie3v3); if (!IS_ERR(rockchip->vpcie1v8)) regulator_disable(rockchip->vpcie1v8); if (!IS_ERR(rockchip->vpcie0v9)) regulator_disable(rockchip->vpcie0v9); err_set_vpcie: rockchip_pcie_disable_clocks(rockchip); return err; } static int rockchip_pcie_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rockchip_pcie *rockchip = dev_get_drvdata(dev); pci_stop_root_bus(rockchip->root_bus); pci_remove_root_bus(rockchip->root_bus); pci_unmap_iospace(rockchip->io); irq_domain_remove(rockchip->irq_domain); rockchip_pcie_deinit_phys(rockchip); rockchip_pcie_disable_clocks(rockchip); if (!IS_ERR(rockchip->vpcie12v)) regulator_disable(rockchip->vpcie12v); if (!IS_ERR(rockchip->vpcie3v3)) regulator_disable(rockchip->vpcie3v3); if (!IS_ERR(rockchip->vpcie1v8)) regulator_disable(rockchip->vpcie1v8); if (!IS_ERR(rockchip->vpcie0v9)) regulator_disable(rockchip->vpcie0v9); return 0; } static const struct dev_pm_ops rockchip_pcie_pm_ops = { SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq, rockchip_pcie_resume_noirq) }; static const struct of_device_id rockchip_pcie_of_match[] = { { .compatible = "rockchip,rk3399-pcie", }, {} }; MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match); static struct platform_driver rockchip_pcie_driver = { .driver = { .name = "rockchip-pcie", .of_match_table = rockchip_pcie_of_match, .pm = &rockchip_pcie_pm_ops, }, .probe = rockchip_pcie_probe, .remove = rockchip_pcie_remove, }; module_platform_driver(rockchip_pcie_driver); MODULE_AUTHOR("Rockchip Inc"); MODULE_DESCRIPTION("Rockchip AXI PCIe driver"); MODULE_LICENSE("GPL v2");