board/armltd/vexpress64/pcie.c

   1 /*
   2  * Copyright (C) ARM Ltd 2015
   3  *
   4  * Author: Liviu Dudau <Liviu.Dudau@arm.com>
   5  *
   6  * SPDX-Licence-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <asm/io.h>
  11 #include <linux/bitops.h>
  12 #include <pci_ids.h>
  13 #include "pcie.h"
  14
  15 /* XpressRICH3 support */
  16 #define XR3_CONFIG_BASE                 0x7ff30000
  17 #define XR3_RESET_BASE                  0x7ff20000
  18
  19 #define XR3_PCI_ECAM_START              0x40000000
  20 #define XR3_PCI_ECAM_SIZE               28      /* as power of 2 = 0x10000000 */
  21 #define XR3_PCI_IOSPACE_START           0x5f800000
  22 #define XR3_PCI_IOSPACE_SIZE            23      /* as power of 2 = 0x800000 */
  23 #define XR3_PCI_MEMSPACE_START          0x50000000
  24 #define XR3_PCI_MEMSPACE_SIZE           27      /* as power of 2 = 0x8000000 */
  25 #define XR3_PCI_MEMSPACE64_START        0x4000000000
  26 #define XR3_PCI_MEMSPACE64_SIZE         33      /* as power of 2 = 0x200000000 */
  27
  28 #define JUNO_V2M_MSI_START              0x2c1c0000
  29 #define JUNO_V2M_MSI_SIZE               12      /* as power of 2 = 4096 */
  30
  31 #define XR3PCI_BASIC_STATUS             0x18
  32 #define XR3PCI_BS_GEN_MASK              (0xf << 8)
  33 #define XR3PCI_BS_LINK_MASK             0xff
  34
  35 #define XR3PCI_VIRTCHAN_CREDITS         0x90
  36 #define XR3PCI_BRIDGE_PCI_IDS           0x9c
  37 #define XR3PCI_PEX_SPC2                 0xd8
  38
  39 #define XR3PCI_ATR_PCIE_WIN0            0x600
  40 #define XR3PCI_ATR_PCIE_WIN1            0x700
  41 #define XR3PCI_ATR_AXI4_SLV0            0x800
  42
  43 #define XR3PCI_ATR_TABLE_SIZE           0x20
  44 #define XR3PCI_ATR_SRC_ADDR_LOW         0x0
  45 #define XR3PCI_ATR_SRC_ADDR_HIGH        0x4
  46 #define XR3PCI_ATR_TRSL_ADDR_LOW        0x8
  47 #define XR3PCI_ATR_TRSL_ADDR_HIGH       0xc
  48 #define XR3PCI_ATR_TRSL_PARAM           0x10
  49
  50 /* IDs used in the XR3PCI_ATR_TRSL_PARAM */
  51 #define XR3PCI_ATR_TRSLID_AXIDEVICE     (0x420004)
  52 #define XR3PCI_ATR_TRSLID_AXIMEMORY     (0x4e0004)  /* Write-through, read/write allocate */
  53 #define XR3PCI_ATR_TRSLID_PCIE_CONF     (0x000001)
  54 #define XR3PCI_ATR_TRSLID_PCIE_IO       (0x020000)
  55 #define XR3PCI_ATR_TRSLID_PCIE_MEMORY   (0x000000)
  56
  57 #define XR3PCI_ECAM_OFFSET(b, d, o)     (((b) << 20) | \
  58                                         (PCI_SLOT(d) << 15) | \
  59                                         (PCI_FUNC(d) << 12) | o)
  60
  61 #define JUNO_RESET_CTRL                 0x1004
  62 #define JUNO_RESET_CTRL_PHY             BIT(0)
  63 #define JUNO_RESET_CTRL_RC              BIT(1)
  64
  65 #define JUNO_RESET_STATUS               0x1008
  66 #define JUNO_RESET_STATUS_PLL           BIT(0)
  67 #define JUNO_RESET_STATUS_PHY           BIT(1)
  68 #define JUNO_RESET_STATUS_RC            BIT(2)
  69 #define JUNO_RESET_STATUS_MASK          (JUNO_RESET_STATUS_PLL | \
  70                                          JUNO_RESET_STATUS_PHY | \
  71                                          JUNO_RESET_STATUS_RC)
  72
  73 void xr3pci_set_atr_entry(unsigned long base, unsigned long src_addr,
  74                         unsigned long trsl_addr, int window_size,
  75                         int trsl_param)
  76 {
  77         /* X3PCI_ATR_SRC_ADDR_LOW:
  78              - bit 0: enable entry,
  79              - bits 1-6: ATR window size: total size in bytes: 2^(ATR_WSIZE + 1)
  80              - bits 7-11: reserved
  81              - bits 12-31: start of source address
  82         */
  83         writel((u32)(src_addr & 0xfffff000) | (window_size - 1) << 1 | 1,
  84                base + XR3PCI_ATR_SRC_ADDR_LOW);
  85         writel((u32)(src_addr >> 32), base + XR3PCI_ATR_SRC_ADDR_HIGH);
  86         writel((u32)(trsl_addr & 0xfffff000), base + XR3PCI_ATR_TRSL_ADDR_LOW);
  87         writel((u32)(trsl_addr >> 32), base + XR3PCI_ATR_TRSL_ADDR_HIGH);
  88         writel(trsl_param, base + XR3PCI_ATR_TRSL_PARAM);
  89
  90         debug("ATR entry: 0x%010lx %s 0x%010lx [0x%010llx] (param: 0x%06x)\n",
  91                src_addr, (trsl_param & 0x400000) ? "<-" : "->", trsl_addr,
  92                ((u64)1) << window_size, trsl_param);
  93 }
  94
  95 void xr3pci_setup_atr(void)
  96 {
  97         /* setup PCIe to CPU address translation tables */
  98         unsigned long base = XR3_CONFIG_BASE + XR3PCI_ATR_PCIE_WIN0;
  99
 100         /* forward all writes from PCIe to GIC V2M (used for MSI) */
 101         xr3pci_set_atr_entry(base, JUNO_V2M_MSI_START, JUNO_V2M_MSI_START,
 102                              JUNO_V2M_MSI_SIZE, XR3PCI_ATR_TRSLID_AXIDEVICE);
 103
 104         base += XR3PCI_ATR_TABLE_SIZE;
 105
 106         /* PCIe devices can write anywhere in memory */
 107         xr3pci_set_atr_entry(base, PHYS_SDRAM_1, PHYS_SDRAM_1,
 108                              31 /* grant access to all RAM under 4GB */,
 109                              XR3PCI_ATR_TRSLID_AXIMEMORY);
 110         base += XR3PCI_ATR_TABLE_SIZE;
 111         xr3pci_set_atr_entry(base, PHYS_SDRAM_2, PHYS_SDRAM_2,
 112                              XR3_PCI_MEMSPACE64_SIZE,
 113                              XR3PCI_ATR_TRSLID_AXIMEMORY);
 114
 115
 116         /* setup CPU to PCIe address translation table */
 117         base = XR3_CONFIG_BASE + XR3PCI_ATR_AXI4_SLV0;
 118
 119         /* setup ECAM space to bus configuration interface */
 120         xr3pci_set_atr_entry(base, XR3_PCI_ECAM_START, 0, XR3_PCI_ECAM_SIZE,
 121                              XR3PCI_ATR_TRSLID_PCIE_CONF);
 122
 123         base += XR3PCI_ATR_TABLE_SIZE;
 124
 125         /* setup IO space translation */
 126         xr3pci_set_atr_entry(base, XR3_PCI_IOSPACE_START, XR3_PCI_IOSPACE_START,
 127                              XR3_PCI_IOSPACE_SIZE, XR3PCI_ATR_TRSLID_PCIE_IO);
 128
 129         base += XR3PCI_ATR_TABLE_SIZE;
 130
 131         /* setup 32bit MEM space translation */
 132         xr3pci_set_atr_entry(base, XR3_PCI_MEMSPACE_START, XR3_PCI_MEMSPACE_START,
 133                              XR3_PCI_MEMSPACE_SIZE, XR3PCI_ATR_TRSLID_PCIE_MEMORY);
 134
 135         base += XR3PCI_ATR_TABLE_SIZE;
 136
 137         /* setup 64bit MEM space translation */
 138         xr3pci_set_atr_entry(base, XR3_PCI_MEMSPACE64_START, XR3_PCI_MEMSPACE64_START,
 139                              XR3_PCI_MEMSPACE64_SIZE, XR3PCI_ATR_TRSLID_PCIE_MEMORY);
 140 }
 141
 142 void xr3pci_init(void)
 143 {
 144         u32 val;
 145         int timeout = 200;
 146
 147         /* Initialise the XpressRICH3 PCIe host bridge */
 148
 149         /* add credits */
 150         writel(0x00f0b818, XR3_CONFIG_BASE + XR3PCI_VIRTCHAN_CREDITS);
 151         writel(0x1, XR3_CONFIG_BASE + XR3PCI_VIRTCHAN_CREDITS + 4);
 152         /* allow ECRC */
 153         writel(0x6006, XR3_CONFIG_BASE + XR3PCI_PEX_SPC2);
 154         /* setup the correct class code for the host bridge */
 155         writel(PCI_CLASS_BRIDGE_PCI << 16, XR3_CONFIG_BASE + XR3PCI_BRIDGE_PCI_IDS);
 156
 157         /* reset phy and root complex */
 158         writel(JUNO_RESET_CTRL_PHY | JUNO_RESET_CTRL_RC,
 159                XR3_RESET_BASE + JUNO_RESET_CTRL);
 160
 161         do {
 162                 mdelay(1);
 163                 val = readl(XR3_RESET_BASE + JUNO_RESET_STATUS);
 164         } while (--timeout &&
 165                 (val & JUNO_RESET_STATUS_MASK) != JUNO_RESET_STATUS_MASK);
 166
 167         if (!timeout) {
 168                 printf("PCI XR3 Root complex reset timed out\n");
 169                 return;
 170         }
 171
 172         /* Wait for the link to train */
 173         mdelay(20);
 174         timeout = 20;
 175
 176         do {
 177                 mdelay(1);
 178                 val = readl(XR3_CONFIG_BASE + XR3PCI_BASIC_STATUS);
 179         } while (--timeout && !(val & XR3PCI_BS_LINK_MASK));
 180
 181         if (!(val & XR3PCI_BS_LINK_MASK)) {
 182                 printf("Failed to negotiate a link!\n");
 183                 return;
 184         }
 185
 186         printf("PCIe XR3 Host Bridge enabled: x%d link (Gen %d)\n",
 187                val & XR3PCI_BS_LINK_MASK, (val & XR3PCI_BS_GEN_MASK) >> 8);
 188
 189         xr3pci_setup_atr();
 190 }
 191
 192 void vexpress64_pcie_init(void)
 193 {
 194         xr3pci_init();
 195 }