/* * PCIe host controller driver for Tegra SoCs * * Copyright (c) 2010, CompuLab, Ltd. * Author: Mike Rapoport * * Based on NVIDIA PCIe driver * Copyright (c) 2008-2009, NVIDIA Corporation. * * Bits taken from arch/arm/mach-dove/pcie.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define INT_PCI_MSI_NR (8 * 32) /* register definitions */ #define AFI_AXI_BAR0_SZ 0x00 #define AFI_AXI_BAR1_SZ 0x04 #define AFI_AXI_BAR2_SZ 0x08 #define AFI_AXI_BAR3_SZ 0x0c #define AFI_AXI_BAR4_SZ 0x10 #define AFI_AXI_BAR5_SZ 0x14 #define AFI_AXI_BAR0_START 0x18 #define AFI_AXI_BAR1_START 0x1c #define AFI_AXI_BAR2_START 0x20 #define AFI_AXI_BAR3_START 0x24 #define AFI_AXI_BAR4_START 0x28 #define AFI_AXI_BAR5_START 0x2c #define AFI_FPCI_BAR0 0x30 #define AFI_FPCI_BAR1 0x34 #define AFI_FPCI_BAR2 0x38 #define AFI_FPCI_BAR3 0x3c #define AFI_FPCI_BAR4 0x40 #define AFI_FPCI_BAR5 0x44 #define AFI_CACHE_BAR0_SZ 0x48 #define AFI_CACHE_BAR0_ST 0x4c #define AFI_CACHE_BAR1_SZ 0x50 #define AFI_CACHE_BAR1_ST 0x54 #define AFI_MSI_BAR_SZ 0x60 #define AFI_MSI_FPCI_BAR_ST 0x64 #define AFI_MSI_AXI_BAR_ST 0x68 #define AFI_MSI_VEC0 0x6c #define AFI_MSI_VEC1 0x70 #define AFI_MSI_VEC2 0x74 #define AFI_MSI_VEC3 0x78 #define AFI_MSI_VEC4 0x7c #define AFI_MSI_VEC5 0x80 #define AFI_MSI_VEC6 0x84 #define AFI_MSI_VEC7 0x88 #define AFI_MSI_EN_VEC0 0x8c #define AFI_MSI_EN_VEC1 0x90 #define AFI_MSI_EN_VEC2 0x94 #define AFI_MSI_EN_VEC3 0x98 #define AFI_MSI_EN_VEC4 0x9c #define AFI_MSI_EN_VEC5 0xa0 #define AFI_MSI_EN_VEC6 0xa4 #define AFI_MSI_EN_VEC7 0xa8 #define AFI_CONFIGURATION 0xac #define AFI_CONFIGURATION_EN_FPCI (1 << 0) #define AFI_FPCI_ERROR_MASKS 0xb0 #define AFI_INTR_MASK 0xb4 #define AFI_INTR_MASK_INT_MASK (1 << 0) #define AFI_INTR_MASK_MSI_MASK (1 << 8) #define AFI_INTR_CODE 0xb8 #define AFI_INTR_CODE_MASK 0xf #define AFI_INTR_AXI_SLAVE_ERROR 1 #define AFI_INTR_AXI_DECODE_ERROR 2 #define AFI_INTR_TARGET_ABORT 3 #define AFI_INTR_MASTER_ABORT 4 #define AFI_INTR_INVALID_WRITE 5 #define AFI_INTR_LEGACY 6 #define AFI_INTR_FPCI_DECODE_ERROR 7 #define AFI_INTR_SIGNATURE 0xbc #define AFI_UPPER_FPCI_ADDRESS 0xc0 #define AFI_SM_INTR_ENABLE 0xc4 #define AFI_SM_INTR_INTA_ASSERT (1 << 0) #define AFI_SM_INTR_INTB_ASSERT (1 << 1) #define AFI_SM_INTR_INTC_ASSERT (1 << 2) #define AFI_SM_INTR_INTD_ASSERT (1 << 3) #define AFI_SM_INTR_INTA_DEASSERT (1 << 4) #define AFI_SM_INTR_INTB_DEASSERT (1 << 5) #define AFI_SM_INTR_INTC_DEASSERT (1 << 6) #define AFI_SM_INTR_INTD_DEASSERT (1 << 7) #define AFI_AFI_INTR_ENABLE 0xc8 #define AFI_INTR_EN_INI_SLVERR (1 << 0) #define AFI_INTR_EN_INI_DECERR (1 << 1) #define AFI_INTR_EN_TGT_SLVERR (1 << 2) #define AFI_INTR_EN_TGT_DECERR (1 << 3) #define AFI_INTR_EN_TGT_WRERR (1 << 4) #define AFI_INTR_EN_DFPCI_DECERR (1 << 5) #define AFI_INTR_EN_AXI_DECERR (1 << 6) #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7) #define AFI_INTR_EN_PRSNT_SENSE (1 << 8) #define AFI_PCIE_CONFIG 0x0f8 #define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1)) #define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20) #define AFI_FUSE 0x104 #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2) #define AFI_PEX0_CTRL 0x110 #define AFI_PEX1_CTRL 0x118 #define AFI_PEX2_CTRL 0x128 #define AFI_PEX_CTRL_RST (1 << 0) #define AFI_PEX_CTRL_CLKREQ_EN (1 << 1) #define AFI_PEX_CTRL_REFCLK_EN (1 << 3) #define AFI_PEXBIAS_CTRL_0 0x168 #define RP_VEND_XP 0x00000F00 #define RP_VEND_XP_DL_UP (1 << 30) #define RP_LINK_CONTROL_STATUS 0x00000090 #define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000 #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000 #define PADS_CTL_SEL 0x0000009C #define PADS_CTL 0x000000A0 #define PADS_CTL_IDDQ_1L (1 << 0) #define PADS_CTL_TX_DATA_EN_1L (1 << 6) #define PADS_CTL_RX_DATA_EN_1L (1 << 10) #define PADS_PLL_CTL_TEGRA20 0x000000B8 #define PADS_PLL_CTL_TEGRA30 0x000000B4 #define PADS_PLL_CTL_RST_B4SM (1 << 1) #define PADS_PLL_CTL_LOCKDET (1 << 8) #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16) #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16) #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16) #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16) #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20) #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20) #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20) #define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22) #define PADS_REFCLK_CFG0 0x000000C8 #define PADS_REFCLK_CFG1 0x000000CC /* * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit * entries, one entry per PCIe port. These field definitions and desired * values aren't in the TRM, but do come from NVIDIA. */ #define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */ #define PADS_REFCLK_CFG_E_TERM_SHIFT 7 #define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */ #define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */ /* Default value provided by HW engineering is 0xfa5c */ #define PADS_REFCLK_CFG_VALUE \ ( \ (0x17 << PADS_REFCLK_CFG_TERM_SHIFT) | \ (0 << PADS_REFCLK_CFG_E_TERM_SHIFT) | \ (0xa << PADS_REFCLK_CFG_PREDI_SHIFT) | \ (0xf << PADS_REFCLK_CFG_DRVI_SHIFT) \ ) struct tegra_msi { struct msi_chip chip; DECLARE_BITMAP(used, INT_PCI_MSI_NR); struct irq_domain *domain; unsigned long pages; struct mutex lock; int irq; }; /* used to differentiate between Tegra SoC generations */ struct tegra_pcie_soc_data { unsigned int num_ports; unsigned int msi_base_shift; u32 pads_pll_ctl; u32 tx_ref_sel; bool has_pex_clkreq_en; bool has_pex_bias_ctrl; bool has_intr_prsnt_sense; bool has_cml_clk; }; static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip) { return container_of(chip, struct tegra_msi, chip); } struct tegra_pcie { struct device *dev; void __iomem *pads; void __iomem *afi; int irq; struct list_head buses; struct resource *cs; struct resource io; struct resource mem; struct resource prefetch; struct resource busn; struct clk *pex_clk; struct clk *afi_clk; struct clk *pll_e; struct clk *cml_clk; struct reset_control *pex_rst; struct reset_control *afi_rst; struct reset_control *pcie_xrst; struct tegra_msi msi; struct list_head ports; unsigned int num_ports; u32 xbar_config; struct regulator_bulk_data *supplies; unsigned int num_supplies; const struct tegra_pcie_soc_data *soc_data; }; struct tegra_pcie_port { struct tegra_pcie *pcie; struct list_head list; struct resource regs; void __iomem *base; unsigned int index; unsigned int lanes; }; struct tegra_pcie_bus { struct vm_struct *area; struct list_head list; unsigned int nr; }; static inline struct tegra_pcie *sys_to_pcie(struct pci_sys_data *sys) { return sys->private_data; } static inline void afi_writel(struct tegra_pcie *pcie, u32 value, unsigned long offset) { writel(value, pcie->afi + offset); } static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset) { return readl(pcie->afi + offset); } static inline void pads_writel(struct tegra_pcie *pcie, u32 value, unsigned long offset) { writel(value, pcie->pads + offset); } static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset) { return readl(pcie->pads + offset); } /* * The configuration space mapping on Tegra is somewhat similar to the ECAM * defined by PCIe. However it deviates a bit in how the 4 bits for extended * register accesses are mapped: * * [27:24] extended register number * [23:16] bus number * [15:11] device number * [10: 8] function number * [ 7: 0] register number * * Mapping the whole extended configuration space would require 256 MiB of * virtual address space, only a small part of which will actually be used. * To work around this, a 1 MiB of virtual addresses are allocated per bus * when the bus is first accessed. When the physical range is mapped, the * the bus number bits are hidden so that the extended register number bits * appear as bits [19:16]. Therefore the virtual mapping looks like this: * * [19:16] extended register number * [15:11] device number * [10: 8] function number * [ 7: 0] register number * * This is achieved by stitching together 16 chunks of 64 KiB of physical * address space via the MMU. */ static unsigned long tegra_pcie_conf_offset(unsigned int devfn, int where) { return ((where & 0xf00) << 8) | (PCI_SLOT(devfn) << 11) | (PCI_FUNC(devfn) << 8) | (where & 0xfc); } static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie, unsigned int busnr) { pgprot_t prot = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | L_PTE_XN | L_PTE_MT_DEV_SHARED | L_PTE_SHARED; phys_addr_t cs = pcie->cs->start; struct tegra_pcie_bus *bus; unsigned int i; int err; bus = kzalloc(sizeof(*bus), GFP_KERNEL); if (!bus) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&bus->list); bus->nr = busnr; /* allocate 1 MiB of virtual addresses */ bus->area = get_vm_area(SZ_1M, VM_IOREMAP); if (!bus->area) { err = -ENOMEM; goto free; } /* map each of the 16 chunks of 64 KiB each */ for (i = 0; i < 16; i++) { unsigned long virt = (unsigned long)bus->area->addr + i * SZ_64K; phys_addr_t phys = cs + i * SZ_1M + busnr * SZ_64K; err = ioremap_page_range(virt, virt + SZ_64K, phys, prot); if (err < 0) { dev_err(pcie->dev, "ioremap_page_range() failed: %d\n", err); goto unmap; } } return bus; unmap: vunmap(bus->area->addr); free: kfree(bus); return ERR_PTR(err); } /* * Look up a virtual address mapping for the specified bus number. If no such * mapping exists, try to create one. */ static void __iomem *tegra_pcie_bus_map(struct tegra_pcie *pcie, unsigned int busnr) { struct tegra_pcie_bus *bus; list_for_each_entry(bus, &pcie->buses, list) if (bus->nr == busnr) return (void __iomem *)bus->area->addr; bus = tegra_pcie_bus_alloc(pcie, busnr); if (IS_ERR(bus)) return NULL; list_add_tail(&bus->list, &pcie->buses); return (void __iomem *)bus->area->addr; } static void __iomem *tegra_pcie_conf_address(struct pci_bus *bus, unsigned int devfn, int where) { struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata); void __iomem *addr = NULL; if (bus->number == 0) { unsigned int slot = PCI_SLOT(devfn); struct tegra_pcie_port *port; list_for_each_entry(port, &pcie->ports, list) { if (port->index + 1 == slot) { addr = port->base + (where & ~3); break; } } } else { addr = tegra_pcie_bus_map(pcie, bus->number); if (!addr) { dev_err(pcie->dev, "failed to map cfg. space for bus %u\n", bus->number); return NULL; } addr += tegra_pcie_conf_offset(devfn, where); } return addr; } static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value) { void __iomem *addr; addr = tegra_pcie_conf_address(bus, devfn, where); if (!addr) { *value = 0xffffffff; return PCIBIOS_DEVICE_NOT_FOUND; } *value = readl(addr); if (size == 1) *value = (*value >> (8 * (where & 3))) & 0xff; else if (size == 2) *value = (*value >> (8 * (where & 3))) & 0xffff; return PCIBIOS_SUCCESSFUL; } static int tegra_pcie_write_conf(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value) { void __iomem *addr; u32 mask, tmp; addr = tegra_pcie_conf_address(bus, devfn, where); if (!addr) return PCIBIOS_DEVICE_NOT_FOUND; if (size == 4) { writel(value, addr); return PCIBIOS_SUCCESSFUL; } if (size == 2) mask = ~(0xffff << ((where & 0x3) * 8)); else if (size == 1) mask = ~(0xff << ((where & 0x3) * 8)); else return PCIBIOS_BAD_REGISTER_NUMBER; tmp = readl(addr) & mask; tmp |= value << ((where & 0x3) * 8); writel(tmp, addr); return PCIBIOS_SUCCESSFUL; } static struct pci_ops tegra_pcie_ops = { .read = tegra_pcie_read_conf, .write = tegra_pcie_write_conf, }; static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port) { unsigned long ret = 0; switch (port->index) { case 0: ret = AFI_PEX0_CTRL; break; case 1: ret = AFI_PEX1_CTRL; break; case 2: ret = AFI_PEX2_CTRL; break; } return ret; } static void tegra_pcie_port_reset(struct tegra_pcie_port *port) { unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port); unsigned long value; /* pulse reset signal */ value = afi_readl(port->pcie, ctrl); value &= ~AFI_PEX_CTRL_RST; afi_writel(port->pcie, value, ctrl); usleep_range(1000, 2000); value = afi_readl(port->pcie, ctrl); value |= AFI_PEX_CTRL_RST; afi_writel(port->pcie, value, ctrl); } static void tegra_pcie_port_enable(struct tegra_pcie_port *port) { const struct tegra_pcie_soc_data *soc = port->pcie->soc_data; unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port); unsigned long value; /* enable reference clock */ value = afi_readl(port->pcie, ctrl); value |= AFI_PEX_CTRL_REFCLK_EN; if (soc->has_pex_clkreq_en) value |= AFI_PEX_CTRL_CLKREQ_EN; afi_writel(port->pcie, value, ctrl); tegra_pcie_port_reset(port); } static void tegra_pcie_port_disable(struct tegra_pcie_port *port) { unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port); unsigned long value; /* assert port reset */ value = afi_readl(port->pcie, ctrl); value &= ~AFI_PEX_CTRL_RST; afi_writel(port->pcie, value, ctrl); /* disable reference clock */ value = afi_readl(port->pcie, ctrl); value &= ~AFI_PEX_CTRL_REFCLK_EN; afi_writel(port->pcie, value, ctrl); } static void tegra_pcie_port_free(struct tegra_pcie_port *port) { struct tegra_pcie *pcie = port->pcie; devm_iounmap(pcie->dev, port->base); devm_release_mem_region(pcie->dev, port->regs.start, resource_size(&port->regs)); list_del(&port->list); devm_kfree(pcie->dev, port); } static void tegra_pcie_fixup_bridge(struct pci_dev *dev) { u16 reg; if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) { pci_read_config_word(dev, PCI_COMMAND, ®); reg |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_SERR); pci_write_config_word(dev, PCI_COMMAND, reg); } } DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_fixup_bridge); /* Tegra PCIE root complex wrongly reports device class */ static void tegra_pcie_fixup_class(struct pci_dev *dev) { dev->class = PCI_CLASS_BRIDGE_PCI << 8; } DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class); /* Tegra PCIE requires relaxed ordering */ static void tegra_pcie_relax_enable(struct pci_dev *dev) { pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN); } DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable); static int tegra_pcie_setup(int nr, struct pci_sys_data *sys) { struct tegra_pcie *pcie = sys_to_pcie(sys); pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset); pci_add_resource_offset(&sys->resources, &pcie->prefetch, sys->mem_offset); pci_add_resource(&sys->resources, &pcie->busn); pci_ioremap_io(nr * SZ_64K, pcie->io.start); return 1; } static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin) { struct tegra_pcie *pcie = sys_to_pcie(pdev->bus->sysdata); int irq; tegra_cpuidle_pcie_irqs_in_use(); irq = of_irq_parse_and_map_pci(pdev, slot, pin); if (!irq) irq = pcie->irq; return irq; } static void tegra_pcie_add_bus(struct pci_bus *bus) { if (IS_ENABLED(CONFIG_PCI_MSI)) { struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata); bus->msi = &pcie->msi.chip; } } static struct pci_bus *tegra_pcie_scan_bus(int nr, struct pci_sys_data *sys) { struct tegra_pcie *pcie = sys_to_pcie(sys); struct pci_bus *bus; bus = pci_create_root_bus(pcie->dev, sys->busnr, &tegra_pcie_ops, sys, &sys->resources); if (!bus) return NULL; pci_scan_child_bus(bus); return bus; } static irqreturn_t tegra_pcie_isr(int irq, void *arg) { const char *err_msg[] = { "Unknown", "AXI slave error", "AXI decode error", "Target abort", "Master abort", "Invalid write", "Response decoding error", "AXI response decoding error", "Transaction timeout", }; struct tegra_pcie *pcie = arg; u32 code, signature; code = afi_readl(pcie, AFI_INTR_CODE) & AFI_INTR_CODE_MASK; signature = afi_readl(pcie, AFI_INTR_SIGNATURE); afi_writel(pcie, 0, AFI_INTR_CODE); if (code == AFI_INTR_LEGACY) return IRQ_NONE; if (code >= ARRAY_SIZE(err_msg)) code = 0; /* * do not pollute kernel log with master abort reports since they * happen a lot during enumeration */ if (code == AFI_INTR_MASTER_ABORT) dev_dbg(pcie->dev, "%s, signature: %08x\n", err_msg[code], signature); else dev_err(pcie->dev, "%s, signature: %08x\n", err_msg[code], signature); if (code == AFI_INTR_TARGET_ABORT || code == AFI_INTR_MASTER_ABORT || code == AFI_INTR_FPCI_DECODE_ERROR) { u32 fpci = afi_readl(pcie, AFI_UPPER_FPCI_ADDRESS) & 0xff; u64 address = (u64)fpci << 32 | (signature & 0xfffffffc); if (code == AFI_INTR_MASTER_ABORT) dev_dbg(pcie->dev, " FPCI address: %10llx\n", address); else dev_err(pcie->dev, " FPCI address: %10llx\n", address); } return IRQ_HANDLED; } /* * FPCI map is as follows: * - 0xfdfc000000: I/O space * - 0xfdfe000000: type 0 configuration space * - 0xfdff000000: type 1 configuration space * - 0xfe00000000: type 0 extended configuration space * - 0xfe10000000: type 1 extended configuration space */ static void tegra_pcie_setup_translations(struct tegra_pcie *pcie) { u32 fpci_bar, size, axi_address; /* Bar 0: type 1 extended configuration space */ fpci_bar = 0xfe100000; size = resource_size(pcie->cs); axi_address = pcie->cs->start; afi_writel(pcie, axi_address, AFI_AXI_BAR0_START); afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ); afi_writel(pcie, fpci_bar, AFI_FPCI_BAR0); /* Bar 1: downstream IO bar */ fpci_bar = 0xfdfc0000; size = resource_size(&pcie->io); axi_address = pcie->io.start; afi_writel(pcie, axi_address, AFI_AXI_BAR1_START); afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ); afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1); /* Bar 2: prefetchable memory BAR */ fpci_bar = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1; size = resource_size(&pcie->prefetch); axi_address = pcie->prefetch.start; afi_writel(pcie, axi_address, AFI_AXI_BAR2_START); afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ); afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2); /* Bar 3: non prefetchable memory BAR */ fpci_bar = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1; size = resource_size(&pcie->mem); axi_address = pcie->mem.start; afi_writel(pcie, axi_address, AFI_AXI_BAR3_START); afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ); afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3); /* NULL out the remaining BARs as they are not used */ afi_writel(pcie, 0, AFI_AXI_BAR4_START); afi_writel(pcie, 0, AFI_AXI_BAR4_SZ); afi_writel(pcie, 0, AFI_FPCI_BAR4); afi_writel(pcie, 0, AFI_AXI_BAR5_START); afi_writel(pcie, 0, AFI_AXI_BAR5_SZ); afi_writel(pcie, 0, AFI_FPCI_BAR5); /* map all upstream transactions as uncached */ afi_writel(pcie, PHYS_OFFSET, AFI_CACHE_BAR0_ST); afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ); afi_writel(pcie, 0, AFI_CACHE_BAR1_ST); afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ); /* MSI translations are setup only when needed */ afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST); afi_writel(pcie, 0, AFI_MSI_BAR_SZ); afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST); afi_writel(pcie, 0, AFI_MSI_BAR_SZ); } static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) { const struct tegra_pcie_soc_data *soc = pcie->soc_data; struct tegra_pcie_port *port; unsigned int timeout; unsigned long value; /* power down PCIe slot clock bias pad */ if (soc->has_pex_bias_ctrl) afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0); /* configure mode and disable all ports */ value = afi_readl(pcie, AFI_PCIE_CONFIG); value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK; value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config; list_for_each_entry(port, &pcie->ports, list) value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index); afi_writel(pcie, value, AFI_PCIE_CONFIG); value = afi_readl(pcie, AFI_FUSE); value |= AFI_FUSE_PCIE_T0_GEN2_DIS; afi_writel(pcie, value, AFI_FUSE); /* initialize internal PHY, enable up to 16 PCIE lanes */ pads_writel(pcie, 0x0, PADS_CTL_SEL); /* override IDDQ to 1 on all 4 lanes */ value = pads_readl(pcie, PADS_CTL); value |= PADS_CTL_IDDQ_1L; pads_writel(pcie, value, PADS_CTL); /* * Set up PHY PLL inputs select PLLE output as refclock, * set TX ref sel to div10 (not div5). */ value = pads_readl(pcie, soc->pads_pll_ctl); value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK); value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel; pads_writel(pcie, value, soc->pads_pll_ctl); /* take PLL out of reset */ value = pads_readl(pcie, soc->pads_pll_ctl); value |= PADS_PLL_CTL_RST_B4SM; pads_writel(pcie, value, soc->pads_pll_ctl); /* Configure the reference clock driver */ value = PADS_REFCLK_CFG_VALUE | (PADS_REFCLK_CFG_VALUE << 16); pads_writel(pcie, value, PADS_REFCLK_CFG0); if (soc->num_ports > 2) pads_writel(pcie, PADS_REFCLK_CFG_VALUE, PADS_REFCLK_CFG1); /* wait for the PLL to lock */ timeout = 300; do { value = pads_readl(pcie, soc->pads_pll_ctl); usleep_range(1000, 2000); if (--timeout == 0) { pr_err("Tegra PCIe error: timeout waiting for PLL\n"); return -EBUSY; } } while (!(value & PADS_PLL_CTL_LOCKDET)); /* turn off IDDQ override */ value = pads_readl(pcie, PADS_CTL); value &= ~PADS_CTL_IDDQ_1L; pads_writel(pcie, value, PADS_CTL); /* enable TX/RX data */ value = pads_readl(pcie, PADS_CTL); value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L; pads_writel(pcie, value, PADS_CTL); /* take the PCIe interface module out of reset */ reset_control_deassert(pcie->pcie_xrst); /* finally enable PCIe */ value = afi_readl(pcie, AFI_CONFIGURATION); value |= AFI_CONFIGURATION_EN_FPCI; afi_writel(pcie, value, AFI_CONFIGURATION); value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR | AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR | AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR; if (soc->has_intr_prsnt_sense) value |= AFI_INTR_EN_PRSNT_SENSE; afi_writel(pcie, value, AFI_AFI_INTR_ENABLE); afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE); /* don't enable MSI for now, only when needed */ afi_writel(pcie, AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK); /* disable all exceptions */ afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS); return 0; } static void tegra_pcie_power_off(struct tegra_pcie *pcie) { int err; /* TODO: disable and unprepare clocks? */ reset_control_assert(pcie->pcie_xrst); reset_control_assert(pcie->afi_rst); reset_control_assert(pcie->pex_rst); tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies); if (err < 0) dev_warn(pcie->dev, "failed to disable regulators: %d\n", err); } static int tegra_pcie_power_on(struct tegra_pcie *pcie) { const struct tegra_pcie_soc_data *soc = pcie->soc_data; int err; reset_control_assert(pcie->pcie_xrst); reset_control_assert(pcie->afi_rst); reset_control_assert(pcie->pex_rst); tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); /* enable regulators */ err = regulator_bulk_enable(pcie->num_supplies, pcie->supplies); if (err < 0) dev_err(pcie->dev, "failed to enable regulators: %d\n", err); err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE, pcie->pex_clk, pcie->pex_rst); if (err) { dev_err(pcie->dev, "powerup sequence failed: %d\n", err); return err; } reset_control_deassert(pcie->afi_rst); err = clk_prepare_enable(pcie->afi_clk); if (err < 0) { dev_err(pcie->dev, "failed to enable AFI clock: %d\n", err); return err; } if (soc->has_cml_clk) { err = clk_prepare_enable(pcie->cml_clk); if (err < 0) { dev_err(pcie->dev, "failed to enable CML clock: %d\n", err); return err; } } err = clk_prepare_enable(pcie->pll_e); if (err < 0) { dev_err(pcie->dev, "failed to enable PLLE clock: %d\n", err); return err; } return 0; } static int tegra_pcie_clocks_get(struct tegra_pcie *pcie) { const struct tegra_pcie_soc_data *soc = pcie->soc_data; pcie->pex_clk = devm_clk_get(pcie->dev, "pex"); if (IS_ERR(pcie->pex_clk)) return PTR_ERR(pcie->pex_clk); pcie->afi_clk = devm_clk_get(pcie->dev, "afi"); if (IS_ERR(pcie->afi_clk)) return PTR_ERR(pcie->afi_clk); pcie->pll_e = devm_clk_get(pcie->dev, "pll_e"); if (IS_ERR(pcie->pll_e)) return PTR_ERR(pcie->pll_e); if (soc->has_cml_clk) { pcie->cml_clk = devm_clk_get(pcie->dev, "cml"); if (IS_ERR(pcie->cml_clk)) return PTR_ERR(pcie->cml_clk); } return 0; } static int tegra_pcie_resets_get(struct tegra_pcie *pcie) { pcie->pex_rst = devm_reset_control_get(pcie->dev, "pex"); if (IS_ERR(pcie->pex_rst)) return PTR_ERR(pcie->pex_rst); pcie->afi_rst = devm_reset_control_get(pcie->dev, "afi"); if (IS_ERR(pcie->afi_rst)) return PTR_ERR(pcie->afi_rst); pcie->pcie_xrst = devm_reset_control_get(pcie->dev, "pcie_x"); if (IS_ERR(pcie->pcie_xrst)) return PTR_ERR(pcie->pcie_xrst); return 0; } static int tegra_pcie_get_resources(struct tegra_pcie *pcie) { struct platform_device *pdev = to_platform_device(pcie->dev); struct resource *pads, *afi, *res; int err; err = tegra_pcie_clocks_get(pcie); if (err) { dev_err(&pdev->dev, "failed to get clocks: %d\n", err); return err; } err = tegra_pcie_resets_get(pcie); if (err) { dev_err(&pdev->dev, "failed to get resets: %d\n", err); return err; } err = tegra_pcie_power_on(pcie); if (err) { dev_err(&pdev->dev, "failed to power up: %d\n", err); return err; } pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads"); pcie->pads = devm_ioremap_resource(&pdev->dev, pads); if (IS_ERR(pcie->pads)) { err = PTR_ERR(pcie->pads); goto poweroff; } afi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "afi"); pcie->afi = devm_ioremap_resource(&pdev->dev, afi); if (IS_ERR(pcie->afi)) { err = PTR_ERR(pcie->afi); goto poweroff; } /* request configuration space, but remap later, on demand */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs"); if (!res) { err = -EADDRNOTAVAIL; goto poweroff; } pcie->cs = devm_request_mem_region(pcie->dev, res->start, resource_size(res), res->name); if (!pcie->cs) { err = -EADDRNOTAVAIL; goto poweroff; } /* request interrupt */ err = platform_get_irq_byname(pdev, "intr"); if (err < 0) { dev_err(&pdev->dev, "failed to get IRQ: %d\n", err); goto poweroff; } pcie->irq = err; err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie); if (err) { dev_err(&pdev->dev, "failed to register IRQ: %d\n", err); goto poweroff; } return 0; poweroff: tegra_pcie_power_off(pcie); return err; } static int tegra_pcie_put_resources(struct tegra_pcie *pcie) { if (pcie->irq > 0) free_irq(pcie->irq, pcie); tegra_pcie_power_off(pcie); return 0; } static int tegra_msi_alloc(struct tegra_msi *chip) { int msi; mutex_lock(&chip->lock); msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR); if (msi < INT_PCI_MSI_NR) set_bit(msi, chip->used); else msi = -ENOSPC; mutex_unlock(&chip->lock); return msi; } static void tegra_msi_free(struct tegra_msi *chip, unsigned long irq) { struct device *dev = chip->chip.dev; mutex_lock(&chip->lock); if (!test_bit(irq, chip->used)) dev_err(dev, "trying to free unused MSI#%lu\n", irq); else clear_bit(irq, chip->used); mutex_unlock(&chip->lock); } static irqreturn_t tegra_pcie_msi_irq(int irq, void *data) { struct tegra_pcie *pcie = data; struct tegra_msi *msi = &pcie->msi; unsigned int i, processed = 0; for (i = 0; i < 8; i++) { unsigned long reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4); while (reg) { unsigned int offset = find_first_bit(®, 32); unsigned int index = i * 32 + offset; unsigned int irq; /* clear the interrupt */ afi_writel(pcie, 1 << offset, AFI_MSI_VEC0 + i * 4); irq = irq_find_mapping(msi->domain, index); if (irq) { if (test_bit(index, msi->used)) generic_handle_irq(irq); else dev_info(pcie->dev, "unhandled MSI\n"); } else { /* * that's weird who triggered this? * just clear it */ dev_info(pcie->dev, "unexpected MSI\n"); } /* see if there's any more pending in this vector */ reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4); processed++; } } return processed > 0 ? IRQ_HANDLED : IRQ_NONE; } static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev, struct msi_desc *desc) { struct tegra_msi *msi = to_tegra_msi(chip); struct msi_msg msg; unsigned int irq; int hwirq; hwirq = tegra_msi_alloc(msi); if (hwirq < 0) return hwirq; irq = irq_create_mapping(msi->domain, hwirq); if (!irq) return -EINVAL; irq_set_msi_desc(irq, desc); msg.address_lo = virt_to_phys((void *)msi->pages); /* 32 bit address only */ msg.address_hi = 0; msg.data = hwirq; write_msi_msg(irq, &msg); return 0; } static void tegra_msi_teardown_irq(struct msi_chip *chip, unsigned int irq) { struct tegra_msi *msi = to_tegra_msi(chip); struct irq_data *d = irq_get_irq_data(irq); tegra_msi_free(msi, d->hwirq); } static struct irq_chip tegra_msi_irq_chip = { .name = "Tegra PCIe MSI", .irq_enable = unmask_msi_irq, .irq_disable = mask_msi_irq, .irq_mask = mask_msi_irq, .irq_unmask = unmask_msi_irq, }; static int tegra_msi_map(struct irq_domain *domain, unsigned int irq, irq_hw_number_t hwirq) { irq_set_chip_and_handler(irq, &tegra_msi_irq_chip, handle_simple_irq); irq_set_chip_data(irq, domain->host_data); set_irq_flags(irq, IRQF_VALID); tegra_cpuidle_pcie_irqs_in_use(); return 0; } static const struct irq_domain_ops msi_domain_ops = { .map = tegra_msi_map, }; static int tegra_pcie_enable_msi(struct tegra_pcie *pcie) { struct platform_device *pdev = to_platform_device(pcie->dev); const struct tegra_pcie_soc_data *soc = pcie->soc_data; struct tegra_msi *msi = &pcie->msi; unsigned long base; int err; u32 reg; mutex_init(&msi->lock); msi->chip.dev = pcie->dev; msi->chip.setup_irq = tegra_msi_setup_irq; msi->chip.teardown_irq = tegra_msi_teardown_irq; msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR, &msi_domain_ops, &msi->chip); if (!msi->domain) { dev_err(&pdev->dev, "failed to create IRQ domain\n"); return -ENOMEM; } err = platform_get_irq_byname(pdev, "msi"); if (err < 0) { dev_err(&pdev->dev, "failed to get IRQ: %d\n", err); goto err; } msi->irq = err; err = request_irq(msi->irq, tegra_pcie_msi_irq, 0, tegra_msi_irq_chip.name, pcie); if (err < 0) { dev_err(&pdev->dev, "failed to request IRQ: %d\n", err); goto err; } /* setup AFI/FPCI range */ msi->pages = __get_free_pages(GFP_KERNEL, 0); base = virt_to_phys((void *)msi->pages); afi_writel(pcie, base >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST); afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST); /* this register is in 4K increments */ afi_writel(pcie, 1, AFI_MSI_BAR_SZ); /* enable all MSI vectors */ afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0); afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1); afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2); afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3); afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4); afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5); afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6); afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7); /* and unmask the MSI interrupt */ reg = afi_readl(pcie, AFI_INTR_MASK); reg |= AFI_INTR_MASK_MSI_MASK; afi_writel(pcie, reg, AFI_INTR_MASK); return 0; err: irq_domain_remove(msi->domain); return err; } static int tegra_pcie_disable_msi(struct tegra_pcie *pcie) { struct tegra_msi *msi = &pcie->msi; unsigned int i, irq; u32 value; /* mask the MSI interrupt */ value = afi_readl(pcie, AFI_INTR_MASK); value &= ~AFI_INTR_MASK_MSI_MASK; afi_writel(pcie, value, AFI_INTR_MASK); /* disable all MSI vectors */ afi_writel(pcie, 0, AFI_MSI_EN_VEC0); afi_writel(pcie, 0, AFI_MSI_EN_VEC1); afi_writel(pcie, 0, AFI_MSI_EN_VEC2); afi_writel(pcie, 0, AFI_MSI_EN_VEC3); afi_writel(pcie, 0, AFI_MSI_EN_VEC4); afi_writel(pcie, 0, AFI_MSI_EN_VEC5); afi_writel(pcie, 0, AFI_MSI_EN_VEC6); afi_writel(pcie, 0, AFI_MSI_EN_VEC7); free_pages(msi->pages, 0); if (msi->irq > 0) free_irq(msi->irq, pcie); for (i = 0; i < INT_PCI_MSI_NR; i++) { irq = irq_find_mapping(msi->domain, i); if (irq > 0) irq_dispose_mapping(irq); } irq_domain_remove(msi->domain); return 0; } static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes, u32 *xbar) { struct device_node *np = pcie->dev->of_node; if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) { switch (lanes) { case 0x00000204: dev_info(pcie->dev, "4x1, 2x1 configuration\n"); *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420; return 0; case 0x00020202: dev_info(pcie->dev, "2x3 configuration\n"); *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222; return 0; case 0x00010104: dev_info(pcie->dev, "4x1, 1x2 configuration\n"); *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411; return 0; } } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) { switch (lanes) { case 0x00000004: dev_info(pcie->dev, "single-mode configuration\n"); *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE; return 0; case 0x00000202: dev_info(pcie->dev, "dual-mode configuration\n"); *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL; return 0; } } return -EINVAL; } /* * Check whether a given set of supplies is available in a device tree node. * This is used to check whether the new or the legacy device tree bindings * should be used. */ static bool of_regulator_bulk_available(struct device_node *np, struct regulator_bulk_data *supplies, unsigned int num_supplies) { char property[32]; unsigned int i; for (i = 0; i < num_supplies; i++) { snprintf(property, 32, "%s-supply", supplies[i].supply); if (of_find_property(np, property, NULL) == NULL) return false; } return true; } /* * Old versions of the device tree binding for this device used a set of power * supplies that didn't match the hardware inputs. This happened to work for a * number of cases but is not future proof. However to preserve backwards- * compatibility with old device trees, this function will try to use the old * set of supplies. */ static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie) { struct device_node *np = pcie->dev->of_node; if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) pcie->num_supplies = 3; else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) pcie->num_supplies = 2; if (pcie->num_supplies == 0) { dev_err(pcie->dev, "device %s not supported in legacy mode\n", np->full_name); return -ENODEV; } pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies, sizeof(*pcie->supplies), GFP_KERNEL); if (!pcie->supplies) return -ENOMEM; pcie->supplies[0].supply = "pex-clk"; pcie->supplies[1].supply = "vdd"; if (pcie->num_supplies > 2) pcie->supplies[2].supply = "avdd"; return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies, pcie->supplies); } /* * Obtains the list of regulators required for a particular generation of the * IP block. * * This would've been nice to do simply by providing static tables for use * with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky * in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB) * and either seems to be optional depending on which ports are being used. */ static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask) { struct device_node *np = pcie->dev->of_node; unsigned int i = 0; if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) { bool need_pexa = false, need_pexb = false; /* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */ if (lane_mask & 0x0f) need_pexa = true; /* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */ if (lane_mask & 0x30) need_pexb = true; pcie->num_supplies = 4 + (need_pexa ? 2 : 0) + (need_pexb ? 2 : 0); pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies, sizeof(*pcie->supplies), GFP_KERNEL); if (!pcie->supplies) return -ENOMEM; pcie->supplies[i++].supply = "avdd-pex-pll"; pcie->supplies[i++].supply = "hvdd-pex"; pcie->supplies[i++].supply = "vddio-pex-ctl"; pcie->supplies[i++].supply = "avdd-plle"; if (need_pexa) { pcie->supplies[i++].supply = "avdd-pexa"; pcie->supplies[i++].supply = "vdd-pexa"; } if (need_pexb) { pcie->supplies[i++].supply = "avdd-pexb"; pcie->supplies[i++].supply = "vdd-pexb"; } } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) { pcie->num_supplies = 5; pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies, sizeof(*pcie->supplies), GFP_KERNEL); if (!pcie->supplies) return -ENOMEM; pcie->supplies[0].supply = "avdd-pex"; pcie->supplies[1].supply = "vdd-pex"; pcie->supplies[2].supply = "avdd-pex-pll"; pcie->supplies[3].supply = "avdd-plle"; pcie->supplies[4].supply = "vddio-pex-clk"; } if (of_regulator_bulk_available(pcie->dev->of_node, pcie->supplies, pcie->num_supplies)) return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies, pcie->supplies); /* * If not all regulators are available for this new scheme, assume * that the device tree complies with an older version of the device * tree binding. */ dev_info(pcie->dev, "using legacy DT binding for power supplies\n"); devm_kfree(pcie->dev, pcie->supplies); pcie->num_supplies = 0; return tegra_pcie_get_legacy_regulators(pcie); } static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) { const struct tegra_pcie_soc_data *soc = pcie->soc_data; struct device_node *np = pcie->dev->of_node, *port; struct of_pci_range_parser parser; struct of_pci_range range; u32 lanes = 0, mask = 0; unsigned int lane = 0; struct resource res; int err; if (of_pci_range_parser_init(&parser, np)) { dev_err(pcie->dev, "missing \"ranges\" property\n"); return -EINVAL; } for_each_of_pci_range(&parser, &range) { of_pci_range_to_resource(&range, np, &res); switch (res.flags & IORESOURCE_TYPE_BITS) { case IORESOURCE_IO: memcpy(&pcie->io, &res, sizeof(res)); pcie->io.name = "I/O"; break; case IORESOURCE_MEM: if (res.flags & IORESOURCE_PREFETCH) { memcpy(&pcie->prefetch, &res, sizeof(res)); pcie->prefetch.name = "PREFETCH"; } else { memcpy(&pcie->mem, &res, sizeof(res)); pcie->mem.name = "MEM"; } break; } } err = of_pci_parse_bus_range(np, &pcie->busn); if (err < 0) { dev_err(pcie->dev, "failed to parse ranges property: %d\n", err); pcie->busn.name = np->name; pcie->busn.start = 0; pcie->busn.end = 0xff; pcie->busn.flags = IORESOURCE_BUS; } /* parse root ports */ for_each_child_of_node(np, port) { struct tegra_pcie_port *rp; unsigned int index; u32 value; err = of_pci_get_devfn(port); if (err < 0) { dev_err(pcie->dev, "failed to parse address: %d\n", err); return err; } index = PCI_SLOT(err); if (index < 1 || index > soc->num_ports) { dev_err(pcie->dev, "invalid port number: %d\n", index); return -EINVAL; } index--; err = of_property_read_u32(port, "nvidia,num-lanes", &value); if (err < 0) { dev_err(pcie->dev, "failed to parse # of lanes: %d\n", err); return err; } if (value > 16) { dev_err(pcie->dev, "invalid # of lanes: %u\n", value); return -EINVAL; } lanes |= value << (index << 3); if (!of_device_is_available(port)) { lane += value; continue; } mask |= ((1 << value) - 1) << lane; lane += value; rp = devm_kzalloc(pcie->dev, sizeof(*rp), GFP_KERNEL); if (!rp) return -ENOMEM; err = of_address_to_resource(port, 0, &rp->regs); if (err < 0) { dev_err(pcie->dev, "failed to parse address: %d\n", err); return err; } INIT_LIST_HEAD(&rp->list); rp->index = index; rp->lanes = value; rp->pcie = pcie; rp->base = devm_ioremap_resource(pcie->dev, &rp->regs); if (IS_ERR(rp->base)) return PTR_ERR(rp->base); list_add_tail(&rp->list, &pcie->ports); } err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config); if (err < 0) { dev_err(pcie->dev, "invalid lane configuration\n"); return err; } err = tegra_pcie_get_regulators(pcie, mask); if (err < 0) return err; return 0; } /* * FIXME: If there are no PCIe cards attached, then calling this function * can result in the increase of the bootup time as there are big timeout * loops. */ #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */ static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port) { unsigned int retries = 3; unsigned long value; do { unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT; do { value = readl(port->base + RP_VEND_XP); if (value & RP_VEND_XP_DL_UP) break; usleep_range(1000, 2000); } while (--timeout); if (!timeout) { dev_err(port->pcie->dev, "link %u down, retrying\n", port->index); goto retry; } timeout = TEGRA_PCIE_LINKUP_TIMEOUT; do { value = readl(port->base + RP_LINK_CONTROL_STATUS); if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE) return true; usleep_range(1000, 2000); } while (--timeout); retry: tegra_pcie_port_reset(port); } while (--retries); return false; } static int tegra_pcie_enable(struct tegra_pcie *pcie) { struct tegra_pcie_port *port, *tmp; struct hw_pci hw; list_for_each_entry_safe(port, tmp, &pcie->ports, list) { dev_info(pcie->dev, "probing port %u, using %u lanes\n", port->index, port->lanes); tegra_pcie_port_enable(port); if (tegra_pcie_port_check_link(port)) continue; dev_info(pcie->dev, "link %u down, ignoring\n", port->index); tegra_pcie_port_disable(port); tegra_pcie_port_free(port); } memset(&hw, 0, sizeof(hw)); hw.nr_controllers = 1; hw.private_data = (void **)&pcie; hw.setup = tegra_pcie_setup; hw.map_irq = tegra_pcie_map_irq; hw.add_bus = tegra_pcie_add_bus; hw.scan = tegra_pcie_scan_bus; hw.ops = &tegra_pcie_ops; pci_common_init_dev(pcie->dev, &hw); return 0; } static const struct tegra_pcie_soc_data tegra20_pcie_data = { .num_ports = 2, .msi_base_shift = 0, .pads_pll_ctl = PADS_PLL_CTL_TEGRA20, .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10, .has_pex_clkreq_en = false, .has_pex_bias_ctrl = false, .has_intr_prsnt_sense = false, .has_cml_clk = false, }; static const struct tegra_pcie_soc_data tegra30_pcie_data = { .num_ports = 3, .msi_base_shift = 8, .pads_pll_ctl = PADS_PLL_CTL_TEGRA30, .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN, .has_pex_clkreq_en = true, .has_pex_bias_ctrl = true, .has_intr_prsnt_sense = true, .has_cml_clk = true, }; static const struct of_device_id tegra_pcie_of_match[] = { { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie_data }, { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie_data }, { }, }; MODULE_DEVICE_TABLE(of, tegra_pcie_of_match); static int tegra_pcie_probe(struct platform_device *pdev) { const struct of_device_id *match; struct tegra_pcie *pcie; int err; match = of_match_device(tegra_pcie_of_match, &pdev->dev); if (!match) return -ENODEV; pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL); if (!pcie) return -ENOMEM; INIT_LIST_HEAD(&pcie->buses); INIT_LIST_HEAD(&pcie->ports); pcie->soc_data = match->data; pcie->dev = &pdev->dev; err = tegra_pcie_parse_dt(pcie); if (err < 0) return err; pcibios_min_mem = 0; err = tegra_pcie_get_resources(pcie); if (err < 0) { dev_err(&pdev->dev, "failed to request resources: %d\n", err); return err; } err = tegra_pcie_enable_controller(pcie); if (err) goto put_resources; /* setup the AFI address translations */ tegra_pcie_setup_translations(pcie); if (IS_ENABLED(CONFIG_PCI_MSI)) { err = tegra_pcie_enable_msi(pcie); if (err < 0) { dev_err(&pdev->dev, "failed to enable MSI support: %d\n", err); goto put_resources; } } err = tegra_pcie_enable(pcie); if (err < 0) { dev_err(&pdev->dev, "failed to enable PCIe ports: %d\n", err); goto disable_msi; } platform_set_drvdata(pdev, pcie); return 0; disable_msi: if (IS_ENABLED(CONFIG_PCI_MSI)) tegra_pcie_disable_msi(pcie); put_resources: tegra_pcie_put_resources(pcie); return err; } static struct platform_driver tegra_pcie_driver = { .driver = { .name = "tegra-pcie", .owner = THIS_MODULE, .of_match_table = tegra_pcie_of_match, .suppress_bind_attrs = true, }, .probe = tegra_pcie_probe, }; module_platform_driver(tegra_pcie_driver); MODULE_AUTHOR("Thierry Reding "); MODULE_DESCRIPTION("NVIDIA Tegra PCIe driver"); MODULE_LICENSE("GPLv2");