// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2015 Marvell International Ltd. * * Copyright (C) 2016 Stefan Roese * * Based on: * - drivers/pci/pcie_imx.c * - drivers/pci/pci_mvebu.c * - drivers/pci/pcie_xilinx.c */ #include #include #include #include #include #include #include #include #include DECLARE_GLOBAL_DATA_PTR; /* PCI Config space registers */ #define PCIE_CONFIG_BAR0 0x10 #define PCIE_LINK_STATUS_REG 0x80 #define PCIE_LINK_STATUS_SPEED_OFF 16 #define PCIE_LINK_STATUS_SPEED_MASK (0xf << PCIE_LINK_STATUS_SPEED_OFF) #define PCIE_LINK_STATUS_WIDTH_OFF 20 #define PCIE_LINK_STATUS_WIDTH_MASK (0xf << PCIE_LINK_STATUS_WIDTH_OFF) /* Resizable bar capability registers */ #define RESIZABLE_BAR_CAP 0x250 #define RESIZABLE_BAR_CTL0 0x254 #define RESIZABLE_BAR_CTL1 0x258 /* iATU registers */ #define PCIE_ATU_VIEWPORT 0x900 #define PCIE_ATU_REGION_INBOUND (0x1 << 31) #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31) #define PCIE_ATU_REGION_INDEX1 (0x1 << 0) #define PCIE_ATU_REGION_INDEX0 (0x0 << 0) #define PCIE_ATU_CR1 0x904 #define PCIE_ATU_TYPE_MEM (0x0 << 0) #define PCIE_ATU_TYPE_IO (0x2 << 0) #define PCIE_ATU_TYPE_CFG0 (0x4 << 0) #define PCIE_ATU_TYPE_CFG1 (0x5 << 0) #define PCIE_ATU_CR2 0x908 #define PCIE_ATU_ENABLE (0x1 << 31) #define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30) #define PCIE_ATU_LOWER_BASE 0x90C #define PCIE_ATU_UPPER_BASE 0x910 #define PCIE_ATU_LIMIT 0x914 #define PCIE_ATU_LOWER_TARGET 0x918 #define PCIE_ATU_BUS(x) (((x) & 0xff) << 24) #define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19) #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16) #define PCIE_ATU_UPPER_TARGET 0x91C #define PCIE_LINK_CAPABILITY 0x7C #define PCIE_LINK_CTL_2 0xA0 #define TARGET_LINK_SPEED_MASK 0xF #define LINK_SPEED_GEN_1 0x1 #define LINK_SPEED_GEN_2 0x2 #define LINK_SPEED_GEN_3 0x3 #define PCIE_GEN3_RELATED 0x890 #define GEN3_EQU_DISABLE (1 << 16) #define GEN3_ZRXDC_NON_COMP (1 << 0) #define PCIE_GEN3_EQU_CTRL 0x8A8 #define GEN3_EQU_EVAL_2MS_DISABLE (1 << 5) #define PCIE_ROOT_COMPLEX_MODE_MASK (0xF << 4) #define PCIE_LINK_UP_TIMEOUT_MS 100 #define PCIE_GLOBAL_CONTROL 0x8000 #define PCIE_APP_LTSSM_EN (1 << 2) #define PCIE_DEVICE_TYPE_OFFSET (4) #define PCIE_DEVICE_TYPE_MASK (0xF) #define PCIE_DEVICE_TYPE_EP (0x0) /* Endpoint */ #define PCIE_DEVICE_TYPE_LEP (0x1) /* Legacy endpoint */ #define PCIE_DEVICE_TYPE_RC (0x4) /* Root complex */ #define PCIE_GLOBAL_STATUS 0x8008 #define PCIE_GLB_STS_RDLH_LINK_UP (1 << 1) #define PCIE_GLB_STS_PHY_LINK_UP (1 << 9) #define PCIE_ARCACHE_TRC 0x8050 #define PCIE_AWCACHE_TRC 0x8054 #define ARCACHE_SHAREABLE_CACHEABLE 0x3511 #define AWCACHE_SHAREABLE_CACHEABLE 0x5311 #define LINK_SPEED_GEN_1 0x1 #define LINK_SPEED_GEN_2 0x2 #define LINK_SPEED_GEN_3 0x3 /** * struct pcie_dw_mvebu - MVEBU DW PCIe controller state * * @ctrl_base: The base address of the register space * @cfg_base: The base address of the configuration space * @cfg_size: The size of the configuration space which is needed * as it gets written into the PCIE_ATU_LIMIT register * @first_busno: This driver supports multiple PCIe controllers. * first_busno stores the bus number of the PCIe root-port * number which may vary depending on the PCIe setup * (PEX switches etc). */ struct pcie_dw_mvebu { void *ctrl_base; void *cfg_base; fdt_size_t cfg_size; int first_busno; /* IO and MEM PCI regions */ int region_count; struct pci_region io; struct pci_region mem; }; static int pcie_dw_get_link_speed(const void *regs_base) { return (readl(regs_base + PCIE_LINK_STATUS_REG) & PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF; } static int pcie_dw_get_link_width(const void *regs_base) { return (readl(regs_base + PCIE_LINK_STATUS_REG) & PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF; } /** * pcie_dw_prog_outbound_atu() - Configure ATU for outbound accesses * * @pcie: Pointer to the PCI controller state * @index: ATU region index * @type: ATU accsess type * @cpu_addr: the physical address for the translation entry * @pci_addr: the pcie bus address for the translation entry * @size: the size of the translation entry */ static void pcie_dw_prog_outbound_atu(struct pcie_dw_mvebu *pcie, int index, int type, u64 cpu_addr, u64 pci_addr, u32 size) { writel(PCIE_ATU_REGION_OUTBOUND | index, pcie->ctrl_base + PCIE_ATU_VIEWPORT); writel(lower_32_bits(cpu_addr), pcie->ctrl_base + PCIE_ATU_LOWER_BASE); writel(upper_32_bits(cpu_addr), pcie->ctrl_base + PCIE_ATU_UPPER_BASE); writel(lower_32_bits(cpu_addr + size - 1), pcie->ctrl_base + PCIE_ATU_LIMIT); writel(lower_32_bits(pci_addr), pcie->ctrl_base + PCIE_ATU_LOWER_TARGET); writel(upper_32_bits(pci_addr), pcie->ctrl_base + PCIE_ATU_UPPER_TARGET); writel(type, pcie->ctrl_base + PCIE_ATU_CR1); writel(PCIE_ATU_ENABLE, pcie->ctrl_base + PCIE_ATU_CR2); } /** * set_cfg_address() - Configure the PCIe controller config space access * * @pcie: Pointer to the PCI controller state * @d: PCI device to access * @where: Offset in the configuration space * * Configures the PCIe controller to access the configuration space of * a specific PCIe device and returns the address to use for this * access. * * Return: Address that can be used to access the configation space * of the requested device / offset */ static uintptr_t set_cfg_address(struct pcie_dw_mvebu *pcie, pci_dev_t d, uint where) { uintptr_t va_address; u32 atu_type; /* * Region #0 is used for Outbound CFG space access. * Direction = Outbound * Region Index = 0 */ if (PCI_BUS(d) == (pcie->first_busno + 1)) /* For local bus, change TLP Type field to 4. */ atu_type = PCIE_ATU_TYPE_CFG0; else /* Otherwise, change TLP Type field to 5. */ atu_type = PCIE_ATU_TYPE_CFG1; if (PCI_BUS(d) == pcie->first_busno) { /* Accessing root port configuration space. */ va_address = (uintptr_t)pcie->ctrl_base; } else { d = PCI_MASK_BUS(d) | (PCI_BUS(d) - pcie->first_busno); pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0, atu_type, (u64)pcie->cfg_base, d << 8, pcie->cfg_size); va_address = (uintptr_t)pcie->cfg_base; } va_address += where & ~0x3; return va_address; } /** * pcie_dw_addr_valid() - Check for valid bus address * * @d: The PCI device to access * @first_busno: Bus number of the PCIe controller root complex * * Return 1 (true) if the PCI device can be accessed by this controller. * * Return: 1 on valid, 0 on invalid */ static int pcie_dw_addr_valid(pci_dev_t d, int first_busno) { if ((PCI_BUS(d) == first_busno) && (PCI_DEV(d) > 0)) return 0; if ((PCI_BUS(d) == first_busno + 1) && (PCI_DEV(d) > 0)) return 0; return 1; } /** * pcie_dw_mvebu_read_config() - Read from configuration space * * @bus: Pointer to the PCI bus * @bdf: Identifies the PCIe device to access * @offset: The offset into the device's configuration space * @valuep: A pointer at which to store the read value * @size: Indicates the size of access to perform * * Read a value of size @size from offset @offset within the configuration * space of the device identified by the bus, device & function numbers in @bdf * on the PCI bus @bus. * * Return: 0 on success */ static int pcie_dw_mvebu_read_config(const struct udevice *bus, pci_dev_t bdf, uint offset, ulong *valuep, enum pci_size_t size) { struct pcie_dw_mvebu *pcie = dev_get_priv(bus); uintptr_t va_address; ulong value; debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ", PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) { debug("- out of range\n"); *valuep = pci_get_ff(size); return 0; } va_address = set_cfg_address(pcie, bdf, offset); value = readl(va_address); debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value); *valuep = pci_conv_32_to_size(value, offset, size); if (pcie->region_count > 1) pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0, PCIE_ATU_TYPE_IO, pcie->io.phys_start, pcie->io.bus_start, pcie->io.size); return 0; } /** * pcie_dw_mvebu_write_config() - Write to configuration space * * @bus: Pointer to the PCI bus * @bdf: Identifies the PCIe device to access * @offset: The offset into the device's configuration space * @value: The value to write * @size: Indicates the size of access to perform * * Write the value @value of size @size from offset @offset within the * configuration space of the device identified by the bus, device & function * numbers in @bdf on the PCI bus @bus. * * Return: 0 on success */ static int pcie_dw_mvebu_write_config(struct udevice *bus, pci_dev_t bdf, uint offset, ulong value, enum pci_size_t size) { struct pcie_dw_mvebu *pcie = dev_get_priv(bus); uintptr_t va_address; ulong old; debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ", PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value); if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) { debug("- out of range\n"); return 0; } va_address = set_cfg_address(pcie, bdf, offset); old = readl(va_address); value = pci_conv_size_to_32(old, value, offset, size); writel(value, va_address); if (pcie->region_count > 1) pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0, PCIE_ATU_TYPE_IO, pcie->io.phys_start, pcie->io.bus_start, pcie->io.size); return 0; } /** * pcie_dw_configure() - Configure link capabilities and speed * * @regs_base: A pointer to the PCIe controller registers * @cap_speed: The capabilities and speed to configure * * Configure the link capabilities and speed in the PCIe root complex. */ static void pcie_dw_configure(const void *regs_base, u32 cap_speed) { /* * TODO (shadi@marvell.com, sr@denx.de): * Need to read the serdes speed from the dts and according to it * configure the PCIe gen */ /* Set link to GEN 3 */ clrsetbits_le32(regs_base + PCIE_LINK_CTL_2, TARGET_LINK_SPEED_MASK, cap_speed); clrsetbits_le32(regs_base + PCIE_LINK_CAPABILITY, TARGET_LINK_SPEED_MASK, cap_speed); setbits_le32(regs_base + PCIE_GEN3_EQU_CTRL, GEN3_EQU_EVAL_2MS_DISABLE); } /** * is_link_up() - Return the link state * * @regs_base: A pointer to the PCIe controller registers * * Return: 1 (true) for active line and 0 (false) for no link */ static int is_link_up(const void *regs_base) { u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP; u32 reg; reg = readl(regs_base + PCIE_GLOBAL_STATUS); if ((reg & mask) == mask) return 1; return 0; } /** * wait_link_up() - Wait for the link to come up * * @regs_base: A pointer to the PCIe controller registers * * Return: 1 (true) for active line and 0 (false) for no link (timeout) */ static int wait_link_up(const void *regs_base) { unsigned long timeout; timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS; while (!is_link_up(regs_base)) { if (get_timer(0) > timeout) return 0; }; return 1; } /** * pcie_dw_mvebu_pcie_link_up() - Configure the PCIe root port * * @regs_base: A pointer to the PCIe controller registers * @cap_speed: The capabilities and speed to configure * * Configure the PCIe controller root complex depending on the * requested link capabilities and speed. * * Return: 1 (true) for active line and 0 (false) for no link */ static int pcie_dw_mvebu_pcie_link_up(const void *regs_base, u32 cap_speed) { if (!is_link_up(regs_base)) { /* Disable LTSSM state machine to enable configuration */ clrbits_le32(regs_base + PCIE_GLOBAL_CONTROL, PCIE_APP_LTSSM_EN); } clrsetbits_le32(regs_base + PCIE_GLOBAL_CONTROL, PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_OFFSET, PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_OFFSET); /* Set the PCIe master AXI attributes */ writel(ARCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_ARCACHE_TRC); writel(AWCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_AWCACHE_TRC); /* DW pre link configurations */ pcie_dw_configure(regs_base, cap_speed); if (!is_link_up(regs_base)) { /* Configuration done. Start LTSSM */ setbits_le32(regs_base + PCIE_GLOBAL_CONTROL, PCIE_APP_LTSSM_EN); } /* Check that link was established */ if (!wait_link_up(regs_base)) return 0; /* * Link can be established in Gen 1. still need to wait * till MAC nagaotiation is completed */ udelay(100); return 1; } /** * pcie_dw_set_host_bars() - Configure the host BARs * * @regs_base: A pointer to the PCIe controller registers * * Configure the host BARs of the PCIe controller root port so that * PCI(e) devices may access the system memory. */ static void pcie_dw_set_host_bars(const void *regs_base) { u32 size = gd->ram_size; u64 max_size; u32 reg; u32 bar0; /* Verify the maximal BAR size */ reg = readl(regs_base + RESIZABLE_BAR_CAP); max_size = 1ULL << (5 + (reg + (1 << 4))); if (size > max_size) { size = max_size; printf("Warning: PCIe BARs can't map all DRAM space\n"); } /* Set the BAR base and size towards DDR */ bar0 = CFG_SYS_SDRAM_BASE & ~0xf; bar0 |= PCI_BASE_ADDRESS_MEM_TYPE_32; writel(CFG_SYS_SDRAM_BASE, regs_base + PCIE_CONFIG_BAR0); reg = ((size >> 20) - 1) << 12; writel(size, regs_base + RESIZABLE_BAR_CTL0); } /** * pcie_dw_mvebu_probe() - Probe the PCIe bus for active link * * @dev: A pointer to the device being operated on * * Probe for an active link on the PCIe bus and configure the controller * to enable this port. * * Return: 0 on success, else -ENODEV */ static int pcie_dw_mvebu_probe(struct udevice *dev) { struct pcie_dw_mvebu *pcie = dev_get_priv(dev); struct udevice *ctlr = pci_get_controller(dev); struct pci_controller *hose = dev_get_uclass_priv(ctlr); #if CONFIG_IS_ENABLED(DM_GPIO) struct gpio_desc reset_gpio; gpio_request_by_name(dev, "marvell,reset-gpio", 0, &reset_gpio, GPIOD_IS_OUT); /* * Issue reset to add-in card trough the dedicated GPIO. * Some boards are connecting the card reset pin to common system * reset wire and others are using separate GPIO port. * In the last case we have to release a reset of the addon card * using this GPIO. */ if (dm_gpio_is_valid(&reset_gpio)) { dm_gpio_set_value(&reset_gpio, 1); /* assert */ mdelay(200); dm_gpio_set_value(&reset_gpio, 0); /* de-assert */ mdelay(200); } #else debug("PCIE Reset on GPIO support is missing\n"); #endif /* DM_GPIO */ pcie->first_busno = dev_seq(dev); /* Don't register host if link is down */ if (!pcie_dw_mvebu_pcie_link_up(pcie->ctrl_base, LINK_SPEED_GEN_3)) { printf("PCIE-%d: Link down\n", dev_seq(dev)); } else { printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev_seq(dev), pcie_dw_get_link_speed(pcie->ctrl_base), pcie_dw_get_link_width(pcie->ctrl_base), hose->first_busno); } pcie->region_count = hose->region_count - CONFIG_NR_DRAM_BANKS; /* Store the IO and MEM windows settings for future use by the ATU */ if (pcie->region_count > 1) { /* IO base */ pcie->io.phys_start = hose->regions[0].phys_start; /* IO_bus_addr */ pcie->io.bus_start = hose->regions[0].bus_start; /* IO size */ pcie->io.size = hose->regions[0].size; } /* MEM base */ pcie->mem.phys_start = hose->regions[pcie->region_count - 1].phys_start; /* MEM_bus_addr */ pcie->mem.bus_start = hose->regions[pcie->region_count - 1].bus_start; /* MEM size */ pcie->mem.size = hose->regions[pcie->region_count - 1].size; pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX1, PCIE_ATU_TYPE_MEM, pcie->mem.phys_start, pcie->mem.bus_start, pcie->mem.size); /* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI_NORMAL */ clrsetbits_le32(pcie->ctrl_base + PCI_CLASS_REVISION, 0xffffff << 8, PCI_CLASS_BRIDGE_PCI_NORMAL << 8); pcie_dw_set_host_bars(pcie->ctrl_base); return 0; } /** * pcie_dw_mvebu_of_to_plat() - Translate from DT to device state * * @dev: A pointer to the device being operated on * * Translate relevant data from the device tree pertaining to device @dev into * state that the driver will later make use of. This state is stored in the * device's private data structure. * * Return: 0 on success, else -EINVAL */ static int pcie_dw_mvebu_of_to_plat(struct udevice *dev) { struct pcie_dw_mvebu *pcie = dev_get_priv(dev); /* Get the controller base address */ pcie->ctrl_base = devfdt_get_addr_index_ptr(dev, 0); if (!pcie->ctrl_base) return -EINVAL; /* Get the config space base address and size */ pcie->cfg_base = devfdt_get_addr_size_index_ptr(dev, 1, &pcie->cfg_size); if (!pcie->cfg_base) return -EINVAL; return 0; } static const struct dm_pci_ops pcie_dw_mvebu_ops = { .read_config = pcie_dw_mvebu_read_config, .write_config = pcie_dw_mvebu_write_config, }; static const struct udevice_id pcie_dw_mvebu_ids[] = { { .compatible = "marvell,armada8k-pcie" }, { } }; U_BOOT_DRIVER(pcie_dw_mvebu) = { .name = "pcie_dw_mvebu", .id = UCLASS_PCI, .of_match = pcie_dw_mvebu_ids, .ops = &pcie_dw_mvebu_ops, .of_to_plat = pcie_dw_mvebu_of_to_plat, .probe = pcie_dw_mvebu_probe, .priv_auto = sizeof(struct pcie_dw_mvebu), };