// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) ARM Ltd 2015 * * Author: Liviu Dudau */ #include #include #include #include #include #include #include #include "pcie.h" /* XpressRICH3 support */ #define XR3_CONFIG_BASE 0x7ff30000 #define XR3_RESET_BASE 0x7ff20000 #define XR3_PCI_ECAM_START 0x40000000 #define XR3_PCI_ECAM_SIZE 28 /* as power of 2 = 0x10000000 */ #define XR3_PCI_IOSPACE_START 0x5f800000 #define XR3_PCI_IOSPACE_SIZE 23 /* as power of 2 = 0x800000 */ #define XR3_PCI_MEMSPACE_START 0x50000000 #define XR3_PCI_MEMSPACE_SIZE 27 /* as power of 2 = 0x8000000 */ #define XR3_PCI_MEMSPACE64_START 0x4000000000 #define XR3_PCI_MEMSPACE64_SIZE 33 /* as power of 2 = 0x200000000 */ #define JUNO_V2M_MSI_START 0x2c1c0000 #define JUNO_V2M_MSI_SIZE 12 /* as power of 2 = 4096 */ #define XR3PCI_BASIC_STATUS 0x18 #define XR3PCI_BS_GEN_MASK (0xf << 8) #define XR3PCI_BS_LINK_MASK 0xff #define XR3PCI_VIRTCHAN_CREDITS 0x90 #define XR3PCI_BRIDGE_PCI_IDS 0x9c #define XR3PCI_PEX_SPC2 0xd8 #define XR3PCI_ATR_PCIE_WIN0 0x600 #define XR3PCI_ATR_PCIE_WIN1 0x700 #define XR3PCI_ATR_AXI4_SLV0 0x800 #define XR3PCI_ATR_TABLE_SIZE 0x20 #define XR3PCI_ATR_SRC_ADDR_LOW 0x0 #define XR3PCI_ATR_SRC_ADDR_HIGH 0x4 #define XR3PCI_ATR_TRSL_ADDR_LOW 0x8 #define XR3PCI_ATR_TRSL_ADDR_HIGH 0xc #define XR3PCI_ATR_TRSL_PARAM 0x10 /* IDs used in the XR3PCI_ATR_TRSL_PARAM */ #define XR3PCI_ATR_TRSLID_AXIDEVICE (0x420004) #define XR3PCI_ATR_TRSLID_AXIMEMORY (0x4e0004) /* Write-through, read/write allocate */ #define XR3PCI_ATR_TRSLID_PCIE_CONF (0x000001) #define XR3PCI_ATR_TRSLID_PCIE_IO (0x020000) #define XR3PCI_ATR_TRSLID_PCIE_MEMORY (0x000000) #define JUNO_RESET_CTRL 0x1004 #define JUNO_RESET_CTRL_PHY BIT(0) #define JUNO_RESET_CTRL_RC BIT(1) #define JUNO_RESET_STATUS 0x1008 #define JUNO_RESET_STATUS_PLL BIT(0) #define JUNO_RESET_STATUS_PHY BIT(1) #define JUNO_RESET_STATUS_RC BIT(2) #define JUNO_RESET_STATUS_MASK (JUNO_RESET_STATUS_PLL | \ JUNO_RESET_STATUS_PHY | \ JUNO_RESET_STATUS_RC) static void xr3pci_set_atr_entry(unsigned long base, unsigned long src_addr, unsigned long trsl_addr, int window_size, int trsl_param) { /* X3PCI_ATR_SRC_ADDR_LOW: - bit 0: enable entry, - bits 1-6: ATR window size: total size in bytes: 2^(ATR_WSIZE + 1) - bits 7-11: reserved - bits 12-31: start of source address */ writel((u32)(src_addr & 0xfffff000) | (window_size - 1) << 1 | 1, base + XR3PCI_ATR_SRC_ADDR_LOW); writel((u32)(src_addr >> 32), base + XR3PCI_ATR_SRC_ADDR_HIGH); writel((u32)(trsl_addr & 0xfffff000), base + XR3PCI_ATR_TRSL_ADDR_LOW); writel((u32)(trsl_addr >> 32), base + XR3PCI_ATR_TRSL_ADDR_HIGH); writel(trsl_param, base + XR3PCI_ATR_TRSL_PARAM); debug("ATR entry: 0x%010lx %s 0x%010lx [0x%010llx] (param: 0x%06x)\n", src_addr, (trsl_param & 0x400000) ? "<-" : "->", trsl_addr, ((u64)1) << window_size, trsl_param); } static void xr3pci_setup_atr(void) { /* setup PCIe to CPU address translation tables */ unsigned long base = XR3_CONFIG_BASE + XR3PCI_ATR_PCIE_WIN0; /* forward all writes from PCIe to GIC V2M (used for MSI) */ xr3pci_set_atr_entry(base, JUNO_V2M_MSI_START, JUNO_V2M_MSI_START, JUNO_V2M_MSI_SIZE, XR3PCI_ATR_TRSLID_AXIDEVICE); base += XR3PCI_ATR_TABLE_SIZE; /* PCIe devices can write anywhere in memory */ xr3pci_set_atr_entry(base, PHYS_SDRAM_1, PHYS_SDRAM_1, 31 /* grant access to all RAM under 4GB */, XR3PCI_ATR_TRSLID_AXIMEMORY); base += XR3PCI_ATR_TABLE_SIZE; xr3pci_set_atr_entry(base, PHYS_SDRAM_2, PHYS_SDRAM_2, XR3_PCI_MEMSPACE64_SIZE, XR3PCI_ATR_TRSLID_AXIMEMORY); /* setup CPU to PCIe address translation table */ base = XR3_CONFIG_BASE + XR3PCI_ATR_AXI4_SLV0; /* setup ECAM space to bus configuration interface */ xr3pci_set_atr_entry(base, XR3_PCI_ECAM_START, 0, XR3_PCI_ECAM_SIZE, XR3PCI_ATR_TRSLID_PCIE_CONF); base += XR3PCI_ATR_TABLE_SIZE; /* setup IO space translation */ xr3pci_set_atr_entry(base, XR3_PCI_IOSPACE_START, 0, XR3_PCI_IOSPACE_SIZE, XR3PCI_ATR_TRSLID_PCIE_IO); base += XR3PCI_ATR_TABLE_SIZE; /* setup 32bit MEM space translation */ xr3pci_set_atr_entry(base, XR3_PCI_MEMSPACE_START, XR3_PCI_MEMSPACE_START, XR3_PCI_MEMSPACE_SIZE, XR3PCI_ATR_TRSLID_PCIE_MEMORY); base += XR3PCI_ATR_TABLE_SIZE; /* setup 64bit MEM space translation */ xr3pci_set_atr_entry(base, XR3_PCI_MEMSPACE64_START, XR3_PCI_MEMSPACE64_START, XR3_PCI_MEMSPACE64_SIZE, XR3PCI_ATR_TRSLID_PCIE_MEMORY); } static void xr3pci_init(void) { u32 val; int timeout = 200; /* Initialise the XpressRICH3 PCIe host bridge */ /* add credits */ writel(0x00f0b818, XR3_CONFIG_BASE + XR3PCI_VIRTCHAN_CREDITS); writel(0x1, XR3_CONFIG_BASE + XR3PCI_VIRTCHAN_CREDITS + 4); /* allow ECRC */ writel(0x6006, XR3_CONFIG_BASE + XR3PCI_PEX_SPC2); /* setup the correct class code for the host bridge */ writel(PCI_CLASS_BRIDGE_PCI << 16, XR3_CONFIG_BASE + XR3PCI_BRIDGE_PCI_IDS); /* reset phy and root complex */ writel(JUNO_RESET_CTRL_PHY | JUNO_RESET_CTRL_RC, XR3_RESET_BASE + JUNO_RESET_CTRL); do { mdelay(1); val = readl(XR3_RESET_BASE + JUNO_RESET_STATUS); } while (--timeout && (val & JUNO_RESET_STATUS_MASK) != JUNO_RESET_STATUS_MASK); if (!timeout) { printf("PCI XR3 Root complex reset timed out\n"); return; } /* Wait for the link to train */ mdelay(20); timeout = 20; do { mdelay(1); val = readl(XR3_CONFIG_BASE + XR3PCI_BASIC_STATUS); } while (--timeout && !(val & XR3PCI_BS_LINK_MASK)); if (!(val & XR3PCI_BS_LINK_MASK)) { printf("Failed to negotiate a link!\n"); return; } printf("PCIe XR3 Host Bridge enabled: x%d link (Gen %d)\n", val & XR3PCI_BS_LINK_MASK, (val & XR3PCI_BS_GEN_MASK) >> 8); xr3pci_setup_atr(); } void vexpress64_pcie_init(void) { /* Initialise and configure the PCIe host bridge. */ xr3pci_init(); /* Register the now ECAM complaint PCIe host controller with U-Boot. */ pci_init(); }