| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * BRIEF MODULE DESCRIPTION |
| * PCI init for Ralink RT2880 solution |
| * |
| * Copyright 2007 Ralink Inc. (bruce_chang@ralinktech.com.tw) |
| * |
| * May 2007 Bruce Chang |
| * Initial Release |
| * |
| * May 2009 Bruce Chang |
| * support RT2880/RT3883 PCIe |
| * |
| * May 2011 Bruce Chang |
| * support RT6855/MT7620 PCIe |
| */ |
| |
| #include <linux/bitops.h> |
| #include <linux/delay.h> |
| #include <linux/iopoll.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/of_irq.h> |
| #include <linux/of_pci.h> |
| #include <linux/of_platform.h> |
| #include <linux/pci.h> |
| #include <linux/platform_device.h> |
| #include <linux/reset.h> |
| #include <mt7621.h> |
| #include <ralink_regs.h> |
| |
| #include "../../pci/pci.h" |
| |
| /* sysctl */ |
| #define MT7621_CHIP_REV_ID 0x0c |
| #define RALINK_CLKCFG1 0x30 |
| #define RALINK_RSTCTRL 0x34 |
| #define CHIP_REV_MT7621_E2 0x0101 |
| |
| /* RALINK_RSTCTRL bits */ |
| #define RALINK_PCIE_RST BIT(23) |
| |
| /* MediaTek specific configuration registers */ |
| #define PCIE_FTS_NUM 0x70c |
| #define PCIE_FTS_NUM_MASK GENMASK(15, 8) |
| #define PCIE_FTS_NUM_L0(x) ((x) & 0xff << 8) |
| |
| /* rt_sysc_membase relative registers */ |
| #define RALINK_PCIE_CLK_GEN 0x7c |
| #define RALINK_PCIE_CLK_GEN1 0x80 |
| |
| /* Host-PCI bridge registers */ |
| #define RALINK_PCI_PCICFG_ADDR 0x0000 |
| #define RALINK_PCI_PCIMSK_ADDR 0x000C |
| #define RALINK_PCI_CONFIG_ADDR 0x0020 |
| #define RALINK_PCI_CONFIG_DATA 0x0024 |
| #define RALINK_PCI_MEMBASE 0x0028 |
| #define RALINK_PCI_IOBASE 0x002C |
| |
| /* PCICFG virtual bridges */ |
| #define MT7621_BR0_MASK GENMASK(19, 16) |
| #define MT7621_BR1_MASK GENMASK(23, 20) |
| #define MT7621_BR2_MASK GENMASK(27, 24) |
| #define MT7621_BR_ALL_MASK GENMASK(27, 16) |
| #define MT7621_BR0_SHIFT 16 |
| #define MT7621_BR1_SHIFT 20 |
| #define MT7621_BR2_SHIFT 24 |
| |
| /* PCIe RC control registers */ |
| #define MT7621_PCIE_OFFSET 0x2000 |
| #define MT7621_NEXT_PORT 0x1000 |
| |
| #define RALINK_PCI_BAR0SETUP_ADDR 0x0010 |
| #define RALINK_PCI_IMBASEBAR0_ADDR 0x0018 |
| #define RALINK_PCI_ID 0x0030 |
| #define RALINK_PCI_CLASS 0x0034 |
| #define RALINK_PCI_SUBID 0x0038 |
| #define RALINK_PCI_STATUS 0x0050 |
| |
| /* Some definition values */ |
| #define PCIE_REVISION_ID BIT(0) |
| #define PCIE_CLASS_CODE (0x60400 << 8) |
| #define PCIE_BAR_MAP_MAX GENMASK(30, 16) |
| #define PCIE_BAR_ENABLE BIT(0) |
| #define PCIE_PORT_INT_EN(x) BIT(20 + (x)) |
| #define PCIE_PORT_CLK_EN(x) BIT(24 + (x)) |
| #define PCIE_PORT_PERST(x) BIT(1 + (x)) |
| #define PCIE_PORT_LINKUP BIT(0) |
| |
| #define PCIE_CLK_GEN_EN BIT(31) |
| #define PCIE_CLK_GEN_DIS 0 |
| #define PCIE_CLK_GEN1_DIS GENMASK(30,24) |
| #define PCIE_CLK_GEN1_EN (BIT(27) | BIT(25)) |
| #define RALINK_PCI_IO_MAP_BASE 0x1e160000 |
| #define MEMORY_BASE 0x0 |
| |
| /* pcie phy related macros */ |
| #define RALINK_PCIEPHY_P0P1_CTL_OFFSET 0x9000 |
| #define RALINK_PCIEPHY_P2_CTL_OFFSET 0xA000 |
| |
| #define RG_P0_TO_P1_WIDTH 0x100 |
| |
| #define RG_PE1_PIPE_REG 0x02c |
| #define RG_PE1_PIPE_RST BIT(12) |
| #define RG_PE1_PIPE_CMD_FRC BIT(4) |
| |
| #define RG_PE1_H_LCDDS_REG 0x49c |
| #define RG_PE1_H_LCDDS_PCW GENMASK(30, 0) |
| #define RG_PE1_H_LCDDS_PCW_VAL(x) ((0x7fffffff & (x)) << 0) |
| |
| #define RG_PE1_FRC_H_XTAL_REG 0x400 |
| #define RG_PE1_FRC_H_XTAL_TYPE BIT(8) |
| #define RG_PE1_H_XTAL_TYPE GENMASK(10, 9) |
| #define RG_PE1_H_XTAL_TYPE_VAL(x) ((0x3 & (x)) << 9) |
| |
| #define RG_PE1_FRC_PHY_REG 0x000 |
| #define RG_PE1_FRC_PHY_EN BIT(4) |
| #define RG_PE1_PHY_EN BIT(5) |
| |
| #define RG_PE1_H_PLL_REG 0x490 |
| #define RG_PE1_H_PLL_BC GENMASK(23, 22) |
| #define RG_PE1_H_PLL_BC_VAL(x) ((0x3 & (x)) << 22) |
| #define RG_PE1_H_PLL_BP GENMASK(21, 18) |
| #define RG_PE1_H_PLL_BP_VAL(x) ((0xf & (x)) << 18) |
| #define RG_PE1_H_PLL_IR GENMASK(15, 12) |
| #define RG_PE1_H_PLL_IR_VAL(x) ((0xf & (x)) << 12) |
| #define RG_PE1_H_PLL_IC GENMASK(11, 8) |
| #define RG_PE1_H_PLL_IC_VAL(x) ((0xf & (x)) << 8) |
| #define RG_PE1_H_PLL_PREDIV GENMASK(7, 6) |
| #define RG_PE1_H_PLL_PREDIV_VAL(x) ((0x3 & (x)) << 6) |
| #define RG_PE1_PLL_DIVEN GENMASK(3, 1) |
| #define RG_PE1_PLL_DIVEN_VAL(x) ((0x7 & (x)) << 1) |
| |
| #define RG_PE1_H_PLL_FBKSEL_REG 0x4bc |
| #define RG_PE1_H_PLL_FBKSEL GENMASK(5, 4) |
| #define RG_PE1_H_PLL_FBKSEL_VAL(x) ((0x3 & (x)) << 4) |
| |
| #define RG_PE1_H_LCDDS_SSC_PRD_REG 0x4a4 |
| #define RG_PE1_H_LCDDS_SSC_PRD GENMASK(15, 0) |
| #define RG_PE1_H_LCDDS_SSC_PRD_VAL(x) ((0xffff & (x)) << 0) |
| |
| #define RG_PE1_H_LCDDS_SSC_DELTA_REG 0x4a8 |
| #define RG_PE1_H_LCDDS_SSC_DELTA GENMASK(11, 0) |
| #define RG_PE1_H_LCDDS_SSC_DELTA_VAL(x) ((0xfff & (x)) << 0) |
| #define RG_PE1_H_LCDDS_SSC_DELTA1 GENMASK(27, 16) |
| #define RG_PE1_H_LCDDS_SSC_DELTA1_VAL(x) ((0xff & (x)) << 16) |
| |
| #define RG_PE1_LCDDS_CLK_PH_INV_REG 0x4a0 |
| #define RG_PE1_LCDDS_CLK_PH_INV BIT(5) |
| |
| #define RG_PE1_H_PLL_BR_REG 0x4ac |
| #define RG_PE1_H_PLL_BR GENMASK(18, 16) |
| #define RG_PE1_H_PLL_BR_VAL(x) ((0x7 & (x)) << 16) |
| |
| #define RG_PE1_MSTCKDIV_REG 0x414 |
| #define RG_PE1_MSTCKDIV GENMASK(7, 6) |
| #define RG_PE1_MSTCKDIV_VAL(x) ((0x3 & (x)) << 6) |
| |
| #define RG_PE1_FRC_MSTCKDIV BIT(5) |
| |
| /** |
| * struct mt7621_pcie_port - PCIe port information |
| * @base: I/O mapped register base |
| * @list: port list |
| * @pcie: pointer to PCIe host info |
| * @phy_reg_offset: offset to related phy registers |
| * @pcie_rst: pointer to port reset control |
| * @slot: port slot |
| * @enabled: indicates if port is enabled |
| */ |
| struct mt7621_pcie_port { |
| void __iomem *base; |
| struct list_head list; |
| struct mt7621_pcie *pcie; |
| u32 phy_reg_offset; |
| struct reset_control *pcie_rst; |
| u32 slot; |
| bool enabled; |
| }; |
| |
| /** |
| * struct mt7621_pcie - PCIe host information |
| * @base: IO Mapped Register Base |
| * @io: IO resource |
| * @mem: non-prefetchable memory resource |
| * @busn: bus range |
| * @offset: IO / Memory offset |
| * @dev: Pointer to PCIe device |
| * @ports: pointer to PCIe port information |
| */ |
| struct mt7621_pcie { |
| void __iomem *base; |
| struct device *dev; |
| struct resource io; |
| struct resource mem; |
| struct resource busn; |
| struct { |
| resource_size_t mem; |
| resource_size_t io; |
| } offset; |
| struct list_head ports; |
| }; |
| |
| static inline u32 pcie_read(struct mt7621_pcie *pcie, u32 reg) |
| { |
| return readl(pcie->base + reg); |
| } |
| |
| static inline void pcie_write(struct mt7621_pcie *pcie, u32 val, u32 reg) |
| { |
| writel(val, pcie->base + reg); |
| } |
| |
| static inline u32 pcie_port_read(struct mt7621_pcie_port *port, u32 reg) |
| { |
| return readl(port->base + reg); |
| } |
| |
| static inline void pcie_port_write(struct mt7621_pcie_port *port, |
| u32 val, u32 reg) |
| { |
| writel(val, port->base + reg); |
| } |
| |
| static inline u32 mt7621_pci_get_cfgaddr(unsigned int bus, unsigned int slot, |
| unsigned int func, unsigned int where) |
| { |
| return (((where & 0xF00) >> 8) << 24) | (bus << 16) | (slot << 11) | |
| (func << 8) | (where & 0xfc) | 0x80000000; |
| } |
| |
| static void __iomem *mt7621_pcie_map_bus(struct pci_bus *bus, |
| unsigned int devfn, int where) |
| { |
| struct mt7621_pcie *pcie = bus->sysdata; |
| u32 address = mt7621_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn), |
| PCI_FUNC(devfn), where); |
| |
| writel(address, pcie->base + RALINK_PCI_CONFIG_ADDR); |
| |
| return pcie->base + RALINK_PCI_CONFIG_DATA + (where & 3); |
| } |
| |
| struct pci_ops mt7621_pci_ops = { |
| .map_bus = mt7621_pcie_map_bus, |
| .read = pci_generic_config_read, |
| .write = pci_generic_config_write, |
| }; |
| |
| static u32 read_config(struct mt7621_pcie *pcie, unsigned int dev, u32 reg) |
| { |
| u32 address = mt7621_pci_get_cfgaddr(0, dev, 0, reg); |
| |
| pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR); |
| return pcie_read(pcie, RALINK_PCI_CONFIG_DATA); |
| } |
| |
| static void write_config(struct mt7621_pcie *pcie, unsigned int dev, |
| u32 reg, u32 val) |
| { |
| u32 address = mt7621_pci_get_cfgaddr(0, dev, 0, reg); |
| |
| pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR); |
| pcie_write(pcie, val, RALINK_PCI_CONFIG_DATA); |
| } |
| |
| static void bypass_pipe_rst(struct mt7621_pcie_port *port) |
| { |
| struct mt7621_pcie *pcie = port->pcie; |
| u32 phy_offset = port->phy_reg_offset; |
| u32 offset = (port->slot != 1) ? |
| phy_offset + RG_PE1_PIPE_REG : |
| phy_offset + RG_PE1_PIPE_REG + RG_P0_TO_P1_WIDTH; |
| u32 reg = pcie_read(pcie, offset); |
| |
| reg &= ~(RG_PE1_PIPE_RST | RG_PE1_PIPE_CMD_FRC); |
| reg |= (RG_PE1_PIPE_RST | RG_PE1_PIPE_CMD_FRC); |
| pcie_write(pcie, reg, offset); |
| } |
| |
| static void set_phy_for_ssc(struct mt7621_pcie_port *port) |
| { |
| struct mt7621_pcie *pcie = port->pcie; |
| struct device *dev = pcie->dev; |
| u32 phy_offset = port->phy_reg_offset; |
| u32 reg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0); |
| u32 offset; |
| u32 val; |
| |
| reg = (reg >> 6) & 0x7; |
| /* Set PCIe Port PHY to disable SSC */ |
| /* Debug Xtal Type */ |
| offset = phy_offset + RG_PE1_FRC_H_XTAL_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_FRC_H_XTAL_TYPE | RG_PE1_H_XTAL_TYPE); |
| val |= RG_PE1_FRC_H_XTAL_TYPE; |
| val |= RG_PE1_H_XTAL_TYPE_VAL(0x00); |
| pcie_write(pcie, val, offset); |
| |
| /* disable port */ |
| offset = (port->slot != 1) ? |
| phy_offset + RG_PE1_FRC_PHY_REG : |
| phy_offset + RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN); |
| val |= RG_PE1_FRC_PHY_EN; |
| pcie_write(pcie, val, offset); |
| |
| /* Set Pre-divider ratio (for host mode) */ |
| offset = phy_offset + RG_PE1_H_PLL_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_H_PLL_PREDIV); |
| |
| if (reg <= 5 && reg >= 3) { /* 40MHz Xtal */ |
| val |= RG_PE1_H_PLL_PREDIV_VAL(0x01); |
| pcie_write(pcie, val, offset); |
| dev_info(dev, "Xtal is 40MHz\n"); |
| } else { /* 25MHz | 20MHz Xtal */ |
| val |= RG_PE1_H_PLL_PREDIV_VAL(0x00); |
| pcie_write(pcie, val, offset); |
| if (reg >= 6) { |
| dev_info(dev, "Xtal is 25MHz\n"); |
| |
| /* Select feedback clock */ |
| offset = phy_offset + RG_PE1_H_PLL_FBKSEL_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_H_PLL_FBKSEL); |
| val |= RG_PE1_H_PLL_FBKSEL_VAL(0x01); |
| pcie_write(pcie, val, offset); |
| |
| /* DDS NCPO PCW (for host mode) */ |
| offset = phy_offset + RG_PE1_H_LCDDS_SSC_PRD_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_H_LCDDS_SSC_PRD); |
| val |= RG_PE1_H_LCDDS_SSC_PRD_VAL(0x18000000); |
| pcie_write(pcie, val, offset); |
| |
| /* DDS SSC dither period control */ |
| offset = phy_offset + RG_PE1_H_LCDDS_SSC_PRD_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_H_LCDDS_SSC_PRD); |
| val |= RG_PE1_H_LCDDS_SSC_PRD_VAL(0x18d); |
| pcie_write(pcie, val, offset); |
| |
| /* DDS SSC dither amplitude control */ |
| offset = phy_offset + RG_PE1_H_LCDDS_SSC_DELTA_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_H_LCDDS_SSC_DELTA | |
| RG_PE1_H_LCDDS_SSC_DELTA1); |
| val |= RG_PE1_H_LCDDS_SSC_DELTA_VAL(0x4a); |
| val |= RG_PE1_H_LCDDS_SSC_DELTA1_VAL(0x4a); |
| pcie_write(pcie, val, offset); |
| } else { |
| dev_info(dev, "Xtal is 20MHz\n"); |
| } |
| } |
| |
| /* DDS clock inversion */ |
| offset = phy_offset + RG_PE1_LCDDS_CLK_PH_INV_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_LCDDS_CLK_PH_INV); |
| val |= RG_PE1_LCDDS_CLK_PH_INV; |
| pcie_write(pcie, val, offset); |
| |
| /* Set PLL bits */ |
| offset = phy_offset + RG_PE1_H_PLL_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_H_PLL_BC | RG_PE1_H_PLL_BP | RG_PE1_H_PLL_IR | |
| RG_PE1_H_PLL_IC | RG_PE1_PLL_DIVEN); |
| val |= RG_PE1_H_PLL_BC_VAL(0x02); |
| val |= RG_PE1_H_PLL_BP_VAL(0x06); |
| val |= RG_PE1_H_PLL_IR_VAL(0x02); |
| val |= RG_PE1_H_PLL_IC_VAL(0x01); |
| val |= RG_PE1_PLL_DIVEN_VAL(0x02); |
| pcie_write(pcie, val, offset); |
| |
| offset = phy_offset + RG_PE1_H_PLL_BR_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_H_PLL_BR); |
| val |= RG_PE1_H_PLL_BR_VAL(0x00); |
| pcie_write(pcie, val, offset); |
| |
| if (reg <= 5 && reg >= 3) { /* 40MHz Xtal */ |
| /* set force mode enable of da_pe1_mstckdiv */ |
| offset = phy_offset + RG_PE1_MSTCKDIV_REG; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_MSTCKDIV | RG_PE1_FRC_MSTCKDIV); |
| val |= (RG_PE1_MSTCKDIV_VAL(0x01) | RG_PE1_FRC_MSTCKDIV); |
| pcie_write(pcie, val, offset); |
| } |
| |
| /* Enable PHY and disable force mode */ |
| offset = (port->slot != 1) ? |
| phy_offset + RG_PE1_FRC_PHY_REG : |
| phy_offset + RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH; |
| val = pcie_read(pcie, offset); |
| val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN); |
| val |= (RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN); |
| pcie_write(pcie, val, offset); |
| } |
| |
| static void mt7621_enable_phy(struct mt7621_pcie_port *port) |
| { |
| u32 chip_rev_id = rt_sysc_r32(MT7621_CHIP_REV_ID); |
| |
| if ((chip_rev_id & 0xFFFF) == CHIP_REV_MT7621_E2) |
| bypass_pipe_rst(port); |
| set_phy_for_ssc(port); |
| } |
| |
| static inline void mt7621_control_assert(struct mt7621_pcie_port *port) |
| { |
| u32 chip_rev_id = rt_sysc_r32(MT7621_CHIP_REV_ID); |
| |
| if ((chip_rev_id & 0xFFFF) == CHIP_REV_MT7621_E2) |
| reset_control_assert(port->pcie_rst); |
| else |
| reset_control_deassert(port->pcie_rst); |
| } |
| |
| static inline void mt7621_control_deassert(struct mt7621_pcie_port *port) |
| { |
| u32 chip_rev_id = rt_sysc_r32(MT7621_CHIP_REV_ID); |
| |
| if ((chip_rev_id & 0xFFFF) == CHIP_REV_MT7621_E2) |
| reset_control_deassert(port->pcie_rst); |
| else |
| reset_control_assert(port->pcie_rst); |
| } |
| |
| static void mt7621_reset_port(struct mt7621_pcie_port *port) |
| { |
| mt7621_control_assert(port); |
| msleep(100); |
| mt7621_control_deassert(port); |
| } |
| |
| static void setup_cm_memory_region(struct mt7621_pcie *pcie) |
| { |
| struct resource *mem_resource = &pcie->mem; |
| struct device *dev = pcie->dev; |
| resource_size_t mask; |
| |
| if (mips_cps_numiocu(0)) { |
| /* |
| * FIXME: hardware doesn't accept mask values with 1s after |
| * 0s (e.g. 0xffef), so it would be great to warn if that's |
| * about to happen |
| */ |
| mask = ~(mem_resource->end - mem_resource->start); |
| |
| write_gcr_reg1_base(mem_resource->start); |
| write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0); |
| dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n", |
| (unsigned long long)read_gcr_reg1_base(), |
| (unsigned long long)read_gcr_reg1_mask()); |
| } |
| } |
| |
| static int mt7621_pci_parse_request_of_pci_ranges(struct mt7621_pcie *pcie) |
| { |
| struct device *dev = pcie->dev; |
| struct device_node *node = dev->of_node; |
| struct of_pci_range_parser parser; |
| struct of_pci_range range; |
| int err; |
| |
| if (of_pci_range_parser_init(&parser, node)) { |
| dev_err(dev, "missing \"ranges\" property\n"); |
| return -EINVAL; |
| } |
| |
| for_each_of_pci_range(&parser, &range) { |
| struct resource *res = NULL; |
| |
| switch (range.flags & IORESOURCE_TYPE_BITS) { |
| case IORESOURCE_IO: |
| ioremap(range.cpu_addr, range.size); |
| res = &pcie->io; |
| pcie->offset.io = 0x00000000UL; |
| break; |
| case IORESOURCE_MEM: |
| res = &pcie->mem; |
| pcie->offset.mem = 0x00000000UL; |
| break; |
| } |
| |
| if (res != NULL) |
| of_pci_range_to_resource(&range, node, res); |
| } |
| |
| err = of_pci_parse_bus_range(node, &pcie->busn); |
| if (err < 0) { |
| dev_err(dev, "failed to parse bus ranges property: %d\n", err); |
| pcie->busn.name = node->name; |
| pcie->busn.start = 0; |
| pcie->busn.end = 0xff; |
| pcie->busn.flags = IORESOURCE_BUS; |
| } |
| |
| return 0; |
| } |
| |
| static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie, |
| struct device_node *node, |
| int slot) |
| { |
| struct mt7621_pcie_port *port; |
| struct device *dev = pcie->dev; |
| struct device_node *pnode = dev->of_node; |
| struct resource regs; |
| char name[6]; |
| int err; |
| |
| port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); |
| if (!port) |
| return -ENOMEM; |
| |
| err = of_address_to_resource(pnode, slot + 1, ®s); |
| if (err) { |
| dev_err(dev, "missing \"reg\" property\n"); |
| return err; |
| } |
| |
| port->base = devm_ioremap_resource(dev, ®s); |
| if (IS_ERR(port->base)) |
| return PTR_ERR(port->base); |
| |
| snprintf(name, sizeof(name), "pcie%d", slot); |
| port->pcie_rst = devm_reset_control_get_exclusive(dev, name); |
| if (PTR_ERR(port->pcie_rst) == -EPROBE_DEFER) { |
| dev_err(dev, "failed to get pcie%d reset control\n", slot); |
| return PTR_ERR(port->pcie_rst); |
| } |
| |
| port->slot = slot; |
| port->pcie = pcie; |
| port->phy_reg_offset = (slot != 2) ? |
| RALINK_PCIEPHY_P0P1_CTL_OFFSET : |
| RALINK_PCIEPHY_P2_CTL_OFFSET; |
| |
| INIT_LIST_HEAD(&port->list); |
| list_add_tail(&port->list, &pcie->ports); |
| |
| return 0; |
| } |
| |
| static int mt7621_pcie_parse_dt(struct mt7621_pcie *pcie) |
| { |
| struct device *dev = pcie->dev; |
| struct device_node *node = dev->of_node, *child; |
| struct resource regs; |
| int err; |
| |
| err = of_address_to_resource(node, 0, ®s); |
| if (err) { |
| dev_err(dev, "missing \"reg\" property\n"); |
| return err; |
| } |
| |
| pcie->base = devm_ioremap_resource(dev, ®s); |
| if (IS_ERR(pcie->base)) |
| return PTR_ERR(pcie->base); |
| |
| for_each_available_child_of_node(node, child) { |
| int slot; |
| |
| err = of_pci_get_devfn(child); |
| if (err < 0) { |
| dev_err(dev, "failed to parse devfn: %d\n", err); |
| return err; |
| } |
| |
| slot = PCI_SLOT(err); |
| |
| err = mt7621_pcie_parse_port(pcie, child, slot); |
| if (err) |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| static int mt7621_pcie_init_port(struct mt7621_pcie_port *port) |
| { |
| struct mt7621_pcie *pcie = port->pcie; |
| struct device *dev = pcie->dev; |
| u32 slot = port->slot; |
| u32 val = 0; |
| |
| /* |
| * Any MT7621 Ralink pcie controller that doesn't have 0x0101 at |
| * the end of the chip_id has inverted PCI resets. |
| */ |
| mt7621_reset_port(port); |
| |
| val = read_config(pcie, slot, PCIE_FTS_NUM); |
| dev_info(dev, "Port %d N_FTS = %x\n", (unsigned int)val, slot); |
| |
| if ((pcie_port_read(port, RALINK_PCI_STATUS) & PCIE_PORT_LINKUP) == 0) { |
| dev_err(dev, "pcie%d no card, disable it (RST & CLK)\n", slot); |
| mt7621_control_assert(port); |
| rt_sysc_m32(PCIE_PORT_CLK_EN(slot), 0, RALINK_CLKCFG1); |
| port->enabled = false; |
| } else { |
| port->enabled = true; |
| } |
| |
| mt7621_enable_phy(port); |
| |
| return 0; |
| } |
| |
| static void mt7621_pcie_init_ports(struct mt7621_pcie *pcie) |
| { |
| struct device *dev = pcie->dev; |
| struct mt7621_pcie_port *port, *tmp; |
| int err; |
| |
| list_for_each_entry_safe(port, tmp, &pcie->ports, list) { |
| u32 slot = port->slot; |
| |
| err = mt7621_pcie_init_port(port); |
| if (err) { |
| dev_err(dev, "Initiating port %d failed\n", slot); |
| list_del(&port->list); |
| } |
| } |
| |
| rt_sysc_m32(0, RALINK_PCIE_RST, RALINK_RSTCTRL); |
| rt_sysc_m32(0x30, 2 << 4, SYSC_REG_SYSTEM_CONFIG1); |
| rt_sysc_m32(PCIE_CLK_GEN_EN, PCIE_CLK_GEN_DIS, RALINK_PCIE_CLK_GEN); |
| rt_sysc_m32(PCIE_CLK_GEN1_DIS, PCIE_CLK_GEN1_EN, RALINK_PCIE_CLK_GEN1); |
| rt_sysc_m32(PCIE_CLK_GEN_DIS, PCIE_CLK_GEN_EN, RALINK_PCIE_CLK_GEN); |
| msleep(50); |
| rt_sysc_m32(RALINK_PCIE_RST, 0, RALINK_RSTCTRL); |
| } |
| |
| static int mt7621_pcie_enable_port(struct mt7621_pcie_port *port) |
| { |
| struct mt7621_pcie *pcie = port->pcie; |
| u32 slot = port->slot; |
| u32 offset = MT7621_PCIE_OFFSET + (slot * MT7621_NEXT_PORT); |
| u32 val; |
| int err; |
| |
| /* assert port PERST_N */ |
| val = pcie_read(pcie, RALINK_PCI_PCICFG_ADDR); |
| val |= PCIE_PORT_PERST(slot); |
| pcie_write(pcie, val, RALINK_PCI_PCICFG_ADDR); |
| |
| /* de-assert port PERST_N */ |
| val = pcie_read(pcie, RALINK_PCI_PCICFG_ADDR); |
| val &= ~PCIE_PORT_PERST(slot); |
| pcie_write(pcie, val, RALINK_PCI_PCICFG_ADDR); |
| |
| /* 100ms timeout value should be enough for Gen1 training */ |
| err = readl_poll_timeout(port->base + RALINK_PCI_STATUS, |
| val, !!(val & PCIE_PORT_LINKUP), |
| 20, 100 * USEC_PER_MSEC); |
| if (err) |
| return -ETIMEDOUT; |
| |
| /* enable pcie interrupt */ |
| val = pcie_read(pcie, RALINK_PCI_PCIMSK_ADDR); |
| val |= PCIE_PORT_INT_EN(slot); |
| pcie_write(pcie, val, RALINK_PCI_PCIMSK_ADDR); |
| |
| /* map 2G DDR region */ |
| pcie_write(pcie, PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE, |
| offset + RALINK_PCI_BAR0SETUP_ADDR); |
| pcie_write(pcie, MEMORY_BASE, |
| offset + RALINK_PCI_IMBASEBAR0_ADDR); |
| |
| /* configure class code and revision ID */ |
| pcie_write(pcie, PCIE_CLASS_CODE | PCIE_REVISION_ID, |
| offset + RALINK_PCI_CLASS); |
| |
| return 0; |
| } |
| |
| static void mt7621_pcie_enable_ports(struct mt7621_pcie *pcie) |
| { |
| struct device *dev = pcie->dev; |
| struct mt7621_pcie_port *port; |
| u8 num_slots_enabled = 0; |
| u32 slot; |
| u32 val; |
| |
| list_for_each_entry(port, &pcie->ports, list) { |
| if (port->enabled) { |
| if (!mt7621_pcie_enable_port(port)) { |
| dev_err(dev, "de-assert port %d PERST_N\n", |
| port->slot); |
| continue; |
| } |
| dev_info(dev, "PCIE%d enabled\n", slot); |
| num_slots_enabled++; |
| } |
| } |
| |
| for (slot = 0; slot < num_slots_enabled; slot++) { |
| val = read_config(pcie, slot, 0x4); |
| write_config(pcie, slot, 0x4, val | 0x4); |
| /* configure RC FTS number to 250 when it leaves L0s */ |
| val = read_config(pcie, slot, PCIE_FTS_NUM); |
| val &= ~PCIE_FTS_NUM_MASK; |
| val |= PCIE_FTS_NUM_L0(0x50); |
| write_config(pcie, slot, PCIE_FTS_NUM, val); |
| } |
| } |
| |
| static int mt7621_pcie_init_virtual_bridges(struct mt7621_pcie *pcie) |
| { |
| u32 pcie_link_status = 0; |
| u32 val= 0; |
| struct mt7621_pcie_port *port; |
| |
| list_for_each_entry(port, &pcie->ports, list) { |
| u32 slot = port->slot; |
| |
| if (port->enabled) |
| pcie_link_status |= BIT(slot); |
| } |
| |
| if (pcie_link_status == 0) |
| return -1; |
| |
| /* |
| * pcie(2/1/0) link status pcie2_num pcie1_num pcie0_num |
| * 3'b000 x x x |
| * 3'b001 x x 0 |
| * 3'b010 x 0 x |
| * 3'b011 x 1 0 |
| * 3'b100 0 x x |
| * 3'b101 1 x 0 |
| * 3'b110 1 0 x |
| * 3'b111 2 1 0 |
| */ |
| switch (pcie_link_status) { |
| case 2: |
| val = pcie_read(pcie, RALINK_PCI_PCICFG_ADDR); |
| val &= ~(MT7621_BR0_MASK | MT7621_BR1_MASK); |
| val |= 0x1 << MT7621_BR0_SHIFT; |
| val |= 0x0 << MT7621_BR1_SHIFT; |
| pcie_write(pcie, val, RALINK_PCI_PCICFG_ADDR); |
| break; |
| case 4: |
| val = pcie_read(pcie, RALINK_PCI_PCICFG_ADDR); |
| val &= ~MT7621_BR_ALL_MASK; |
| val |= 0x1 << MT7621_BR0_SHIFT; |
| val |= 0x2 << MT7621_BR1_SHIFT; |
| val |= 0x0 << MT7621_BR2_SHIFT; |
| pcie_write(pcie, val, RALINK_PCI_PCICFG_ADDR); |
| break; |
| case 5: |
| val = pcie_read(pcie, RALINK_PCI_PCICFG_ADDR); |
| val &= ~MT7621_BR_ALL_MASK; |
| val |= 0x0 << MT7621_BR0_SHIFT; |
| val |= 0x2 << MT7621_BR1_SHIFT; |
| val |= 0x1 << MT7621_BR2_SHIFT; |
| pcie_write(pcie, val, RALINK_PCI_PCICFG_ADDR); |
| break; |
| case 6: |
| val = pcie_read(pcie, RALINK_PCI_PCICFG_ADDR); |
| val &= ~MT7621_BR_ALL_MASK; |
| val |= 0x2 << MT7621_BR0_SHIFT; |
| val |= 0x0 << MT7621_BR1_SHIFT; |
| val |= 0x1 << MT7621_BR2_SHIFT; |
| pcie_write(pcie, val, RALINK_PCI_PCICFG_ADDR); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int mt7621_pcie_request_resources(struct mt7621_pcie *pcie, |
| struct list_head *res) |
| { |
| struct device *dev = pcie->dev; |
| int err; |
| |
| pci_add_resource_offset(res, &pcie->io, pcie->offset.io); |
| pci_add_resource_offset(res, &pcie->mem, pcie->offset.mem); |
| pci_add_resource(res, &pcie->busn); |
| |
| err = devm_request_pci_bus_resources(dev, res); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| |
| static int mt7621_pcie_register_host(struct pci_host_bridge *host, |
| struct list_head *res) |
| { |
| struct mt7621_pcie *pcie = pci_host_bridge_priv(host); |
| |
| list_splice_init(res, &host->windows); |
| host->busnr = pcie->busn.start; |
| host->dev.parent = pcie->dev; |
| host->ops = &mt7621_pci_ops; |
| host->map_irq = of_irq_parse_and_map_pci; |
| host->swizzle_irq = pci_common_swizzle; |
| host->sysdata = pcie; |
| |
| return pci_host_probe(host); |
| } |
| |
| static int mt7621_pci_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct mt7621_pcie *pcie; |
| struct pci_host_bridge *bridge; |
| int err; |
| LIST_HEAD(res); |
| |
| if (!dev->of_node) |
| return -ENODEV; |
| |
| bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie)); |
| if (!bridge) |
| return -ENOMEM; |
| |
| pcie = pci_host_bridge_priv(bridge); |
| pcie->dev = dev; |
| platform_set_drvdata(pdev, pcie); |
| INIT_LIST_HEAD(&pcie->ports); |
| |
| err = mt7621_pcie_parse_dt(pcie); |
| if (err) { |
| dev_err(dev, "Parsing DT failed\n"); |
| return err; |
| } |
| |
| /* set resources limits */ |
| iomem_resource.start = 0; |
| iomem_resource.end = ~0UL; /* no limit */ |
| ioport_resource.start = 0; |
| ioport_resource.end = ~0UL; /* no limit */ |
| |
| mt7621_pcie_init_ports(pcie); |
| |
| err = mt7621_pcie_init_virtual_bridges(pcie); |
| if (err) { |
| dev_err(dev, "Nothing is connected in virtual bridges. Exiting..."); |
| return 0; |
| } |
| |
| pcie_write(pcie, 0xffffffff, RALINK_PCI_MEMBASE); |
| pcie_write(pcie, RALINK_PCI_IO_MAP_BASE, RALINK_PCI_IOBASE); |
| |
| mt7621_pcie_enable_ports(pcie); |
| |
| err = mt7621_pci_parse_request_of_pci_ranges(pcie); |
| if (err) { |
| dev_err(dev, "Error requesting pci resources from ranges"); |
| return err; |
| } |
| |
| setup_cm_memory_region(pcie); |
| |
| err = mt7621_pcie_request_resources(pcie, &res); |
| if (err) { |
| dev_err(dev, "Error requesting resources\n"); |
| return err; |
| } |
| |
| err = mt7621_pcie_register_host(bridge, &res); |
| if (err) { |
| dev_err(dev, "Error registering host\n"); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| static const struct of_device_id mt7621_pci_ids[] = { |
| { .compatible = "mediatek,mt7621-pci" }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, mt7621_pci_ids); |
| |
| static struct platform_driver mt7621_pci_driver = { |
| .probe = mt7621_pci_probe, |
| .driver = { |
| .name = "mt7621-pci", |
| .of_match_table = of_match_ptr(mt7621_pci_ids), |
| }, |
| }; |
| |
| static int __init mt7621_pci_init(void) |
| { |
| return platform_driver_register(&mt7621_pci_driver); |
| } |
| |
| arch_initcall(mt7621_pci_init); |