diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/mips/pci/pci-mt7620.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/arch/mips/pci/pci-mt7620.c b/arch/mips/pci/pci-mt7620.c new file mode 100644 index 000000000..e03293234 --- /dev/null +++ b/arch/mips/pci/pci-mt7620.c @@ -0,0 +1,421 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Ralink MT7620A SoC PCI support + * + * Copyright (C) 2007-2013 Bruce Chang (Mediatek) + * Copyright (C) 2013-2016 John Crispin <john@phrozen.org> + */ + +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/io.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_pci.h> +#include <linux/reset.h> +#include <linux/platform_device.h> + +#include <asm/mach-ralink/ralink_regs.h> +#include <asm/mach-ralink/mt7620.h> + +#define RALINK_PCI_IO_MAP_BASE 0x10160000 +#define RALINK_PCI_MEMORY_BASE 0x0 + +#define RALINK_INT_PCIE0 4 + +#define RALINK_CLKCFG1 0x30 +#define RALINK_GPIOMODE 0x60 + +#define PPLL_CFG1 0x9c +#define PPLL_LD BIT(23) + +#define PPLL_DRV 0xa0 +#define PDRV_SW_SET BIT(31) +#define LC_CKDRVPD BIT(19) +#define LC_CKDRVOHZ BIT(18) +#define LC_CKDRVHZ BIT(17) +#define LC_CKTEST BIT(16) + +/* PCI Bridge registers */ +#define RALINK_PCI_PCICFG_ADDR 0x00 +#define PCIRST BIT(1) + +#define RALINK_PCI_PCIENA 0x0C +#define PCIINT2 BIT(20) + +#define RALINK_PCI_CONFIG_ADDR 0x20 +#define RALINK_PCI_CONFIG_DATA_VIRT_REG 0x24 +#define RALINK_PCI_MEMBASE 0x28 +#define RALINK_PCI_IOBASE 0x2C + +/* PCI RC registers */ +#define RALINK_PCI0_BAR0SETUP_ADDR 0x10 +#define RALINK_PCI0_IMBASEBAR0_ADDR 0x18 +#define RALINK_PCI0_ID 0x30 +#define RALINK_PCI0_CLASS 0x34 +#define RALINK_PCI0_SUBID 0x38 +#define RALINK_PCI0_STATUS 0x50 +#define PCIE_LINK_UP_ST BIT(0) + +#define PCIEPHY0_CFG 0x90 + +#define RALINK_PCIEPHY_P0_CTL_OFFSET 0x7498 +#define RALINK_PCIE0_CLK_EN BIT(26) + +#define BUSY 0x80000000 +#define WAITRETRY_MAX 10 +#define WRITE_MODE (1UL << 23) +#define DATA_SHIFT 0 +#define ADDR_SHIFT 8 + + +static void __iomem *bridge_base; +static void __iomem *pcie_base; + +static struct reset_control *rstpcie0; + +static inline void bridge_w32(u32 val, unsigned reg) +{ + iowrite32(val, bridge_base + reg); +} + +static inline u32 bridge_r32(unsigned reg) +{ + return ioread32(bridge_base + reg); +} + +static inline void pcie_w32(u32 val, unsigned reg) +{ + iowrite32(val, pcie_base + reg); +} + +static inline u32 pcie_r32(unsigned reg) +{ + return ioread32(pcie_base + reg); +} + +static inline void pcie_m32(u32 clr, u32 set, unsigned reg) +{ + u32 val = pcie_r32(reg); + + val &= ~clr; + val |= set; + pcie_w32(val, reg); +} + +static int wait_pciephy_busy(void) +{ + unsigned long reg_value = 0x0, retry = 0; + + while (1) { + reg_value = pcie_r32(PCIEPHY0_CFG); + + if (reg_value & BUSY) + mdelay(100); + else + break; + if (retry++ > WAITRETRY_MAX) { + pr_warn("PCIE-PHY retry failed.\n"); + return -1; + } + } + return 0; +} + +static void pcie_phy(unsigned long addr, unsigned long val) +{ + wait_pciephy_busy(); + pcie_w32(WRITE_MODE | (val << DATA_SHIFT) | (addr << ADDR_SHIFT), + PCIEPHY0_CFG); + mdelay(1); + wait_pciephy_busy(); +} + +static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 *val) +{ + unsigned int slot = PCI_SLOT(devfn); + u8 func = PCI_FUNC(devfn); + u32 address; + u32 data; + u32 num = 0; + + if (bus) + num = bus->number; + + address = (((where & 0xF00) >> 8) << 24) | (num << 16) | (slot << 11) | + (func << 8) | (where & 0xfc) | 0x80000000; + bridge_w32(address, RALINK_PCI_CONFIG_ADDR); + data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRT_REG); + + switch (size) { + case 1: + *val = (data >> ((where & 3) << 3)) & 0xff; + break; + case 2: + *val = (data >> ((where & 3) << 3)) & 0xffff; + break; + case 4: + *val = data; + break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 val) +{ + unsigned int slot = PCI_SLOT(devfn); + u8 func = PCI_FUNC(devfn); + u32 address; + u32 data; + u32 num = 0; + + if (bus) + num = bus->number; + + address = (((where & 0xF00) >> 8) << 24) | (num << 16) | (slot << 11) | + (func << 8) | (where & 0xfc) | 0x80000000; + bridge_w32(address, RALINK_PCI_CONFIG_ADDR); + data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRT_REG); + + switch (size) { + case 1: + data = (data & ~(0xff << ((where & 3) << 3))) | + (val << ((where & 3) << 3)); + break; + case 2: + data = (data & ~(0xffff << ((where & 3) << 3))) | + (val << ((where & 3) << 3)); + break; + case 4: + data = val; + break; + } + + bridge_w32(data, RALINK_PCI_CONFIG_DATA_VIRT_REG); + + return PCIBIOS_SUCCESSFUL; +} + +struct pci_ops mt7620_pci_ops = { + .read = pci_config_read, + .write = pci_config_write, +}; + +static struct resource mt7620_res_pci_mem1; +static struct resource mt7620_res_pci_io1; +struct pci_controller mt7620_controller = { + .pci_ops = &mt7620_pci_ops, + .mem_resource = &mt7620_res_pci_mem1, + .mem_offset = 0x00000000UL, + .io_resource = &mt7620_res_pci_io1, + .io_offset = 0x00000000UL, + .io_map_base = 0xa0000000, +}; + +static int mt7620_pci_hw_init(struct platform_device *pdev) +{ + /* bypass PCIe DLL */ + pcie_phy(0x0, 0x80); + pcie_phy(0x1, 0x04); + + /* Elastic buffer control */ + pcie_phy(0x68, 0xB4); + + /* put core into reset */ + pcie_m32(0, PCIRST, RALINK_PCI_PCICFG_ADDR); + reset_control_assert(rstpcie0); + + /* disable power and all clocks */ + rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1); + rt_sysc_m32(LC_CKDRVPD, PDRV_SW_SET, PPLL_DRV); + + /* bring core out of reset */ + reset_control_deassert(rstpcie0); + rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1); + mdelay(100); + + if (!(rt_sysc_r32(PPLL_CFG1) & PPLL_LD)) { + dev_err(&pdev->dev, "pcie PLL not locked, aborting init\n"); + reset_control_assert(rstpcie0); + rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1); + return -1; + } + + /* power up the bus */ + rt_sysc_m32(LC_CKDRVHZ | LC_CKDRVOHZ, LC_CKDRVPD | PDRV_SW_SET, + PPLL_DRV); + + return 0; +} + +static int mt7628_pci_hw_init(struct platform_device *pdev) +{ + u32 val = 0; + + /* bring the core out of reset */ + rt_sysc_m32(BIT(16), 0, RALINK_GPIOMODE); + reset_control_deassert(rstpcie0); + + /* enable the pci clk */ + rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1); + mdelay(100); + + /* voodoo from the SDK driver */ + pcie_m32(~0xff, 0x5, RALINK_PCIEPHY_P0_CTL_OFFSET); + + pci_config_read(NULL, 0, 0x70c, 4, &val); + val &= ~(0xff) << 8; + val |= 0x50 << 8; + pci_config_write(NULL, 0, 0x70c, 4, val); + + pci_config_read(NULL, 0, 0x70c, 4, &val); + dev_err(&pdev->dev, "Port 0 N_FTS = %x\n", (unsigned int) val); + + return 0; +} + +static int mt7620_pci_probe(struct platform_device *pdev) +{ + struct resource *bridge_res = platform_get_resource(pdev, + IORESOURCE_MEM, 0); + struct resource *pcie_res = platform_get_resource(pdev, + IORESOURCE_MEM, 1); + u32 val = 0; + + rstpcie0 = devm_reset_control_get_exclusive(&pdev->dev, "pcie0"); + if (IS_ERR(rstpcie0)) + return PTR_ERR(rstpcie0); + + bridge_base = devm_ioremap_resource(&pdev->dev, bridge_res); + if (IS_ERR(bridge_base)) + return PTR_ERR(bridge_base); + + pcie_base = devm_ioremap_resource(&pdev->dev, pcie_res); + if (IS_ERR(pcie_base)) + return PTR_ERR(pcie_base); + + iomem_resource.start = 0; + iomem_resource.end = ~0; + ioport_resource.start = 0; + ioport_resource.end = ~0; + + /* bring up the pci core */ + switch (ralink_soc) { + case MT762X_SOC_MT7620A: + if (mt7620_pci_hw_init(pdev)) + return -1; + break; + + case MT762X_SOC_MT7628AN: + case MT762X_SOC_MT7688: + if (mt7628_pci_hw_init(pdev)) + return -1; + break; + + default: + dev_err(&pdev->dev, "pcie is not supported on this hardware\n"); + return -1; + } + mdelay(50); + + /* enable write access */ + pcie_m32(PCIRST, 0, RALINK_PCI_PCICFG_ADDR); + mdelay(100); + + /* check if there is a card present */ + if ((pcie_r32(RALINK_PCI0_STATUS) & PCIE_LINK_UP_ST) == 0) { + reset_control_assert(rstpcie0); + rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1); + if (ralink_soc == MT762X_SOC_MT7620A) + rt_sysc_m32(LC_CKDRVPD, PDRV_SW_SET, PPLL_DRV); + dev_err(&pdev->dev, "PCIE0 no card, disable it(RST&CLK)\n"); + return -1; + } + + /* setup ranges */ + bridge_w32(0xffffffff, RALINK_PCI_MEMBASE); + bridge_w32(RALINK_PCI_IO_MAP_BASE, RALINK_PCI_IOBASE); + + pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR); + pcie_w32(RALINK_PCI_MEMORY_BASE, RALINK_PCI0_IMBASEBAR0_ADDR); + pcie_w32(0x06040001, RALINK_PCI0_CLASS); + + /* enable interrupts */ + pcie_m32(0, PCIINT2, RALINK_PCI_PCIENA); + + /* voodoo from the SDK driver */ + pci_config_read(NULL, 0, 4, 4, &val); + pci_config_write(NULL, 0, 4, 4, val | 0x7); + + pci_load_of_ranges(&mt7620_controller, pdev->dev.of_node); + register_pci_controller(&mt7620_controller); + + return 0; +} + +int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + u16 cmd; + u32 val; + int irq = 0; + + if ((dev->bus->number == 0) && (slot == 0)) { + pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR); + pci_config_write(dev->bus, 0, PCI_BASE_ADDRESS_0, 4, + RALINK_PCI_MEMORY_BASE); + pci_config_read(dev->bus, 0, PCI_BASE_ADDRESS_0, 4, &val); + } else if ((dev->bus->number == 1) && (slot == 0x0)) { + irq = RALINK_INT_PCIE0; + } else { + dev_err(&dev->dev, "no irq found - bus=0x%x, slot = 0x%x\n", + dev->bus->number, slot); + return 0; + } + dev_err(&dev->dev, "card - bus=0x%x, slot = 0x%x irq=%d\n", + dev->bus->number, slot, irq); + + /* configure the cache line size to 0x14 */ + pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x14); + + /* configure latency timer to 0xff */ + pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xff); + pci_read_config_word(dev, PCI_COMMAND, &cmd); + + /* setup the slot */ + cmd = cmd | PCI_COMMAND_MASTER | PCI_COMMAND_IO | PCI_COMMAND_MEMORY; + pci_write_config_word(dev, PCI_COMMAND, cmd); + pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq); + + return irq; +} + +int pcibios_plat_dev_init(struct pci_dev *dev) +{ + return 0; +} + +static const struct of_device_id mt7620_pci_ids[] = { + { .compatible = "mediatek,mt7620-pci" }, + {}, +}; + +static struct platform_driver mt7620_pci_driver = { + .probe = mt7620_pci_probe, + .driver = { + .name = "mt7620-pci", + .of_match_table = of_match_ptr(mt7620_pci_ids), + }, +}; + +static int __init mt7620_pci_init(void) +{ + return platform_driver_register(&mt7620_pci_driver); +} + +arch_initcall(mt7620_pci_init); |