drivers/pci/pci_sh7751.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * SH7751 PCI Controller (PCIC) for U-Boot.
   4  * (C) Dustin McIntire (dustin@sensoria.com)
   5  * (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
   6  */
   7
   8 #include <common.h>
   9 #include <pci.h>
  10 #include <asm/processor.h>
  11 #include <asm/io.h>
  12 #include <asm/pci.h>
  13
  14 /* Register addresses and such */
  15 #define SH7751_BCR1     (vu_long *)0xFF800000
  16 #define SH7751_BCR2     (vu_short *)0xFF800004
  17 #define SH7751_WCR1     (vu_long *)0xFF800008
  18 #define SH7751_WCR2     (vu_long *)0xFF80000C
  19 #define SH7751_WCR3     (vu_long *)0xFF800010
  20 #define SH7751_MCR      (vu_long *)0xFF800014
  21 #define SH7751_BCR3     (vu_short *)0xFF800050
  22 #define SH7751_PCICONF0 (vu_long *)0xFE200000
  23 #define SH7751_PCICONF1 (vu_long *)0xFE200004
  24 #define SH7751_PCICONF2 (vu_long *)0xFE200008
  25 #define SH7751_PCICONF3 (vu_long *)0xFE20000C
  26 #define SH7751_PCICONF4 (vu_long *)0xFE200010
  27 #define SH7751_PCICONF5 (vu_long *)0xFE200014
  28 #define SH7751_PCICONF6 (vu_long *)0xFE200018
  29 #define SH7751_PCICR    (vu_long *)0xFE200100
  30 #define SH7751_PCILSR0  (vu_long *)0xFE200104
  31 #define SH7751_PCILSR1  (vu_long *)0xFE200108
  32 #define SH7751_PCILAR0  (vu_long *)0xFE20010C
  33 #define SH7751_PCILAR1  (vu_long *)0xFE200110
  34 #define SH7751_PCIMBR   (vu_long *)0xFE2001C4
  35 #define SH7751_PCIIOBR  (vu_long *)0xFE2001C8
  36 #define SH7751_PCIPINT  (vu_long *)0xFE2001CC
  37 #define SH7751_PCIPINTM (vu_long *)0xFE2001D0
  38 #define SH7751_PCICLKR  (vu_long *)0xFE2001D4
  39 #define SH7751_PCIBCR1  (vu_long *)0xFE2001E0
  40 #define SH7751_PCIBCR2  (vu_long *)0xFE2001E4
  41 #define SH7751_PCIWCR1  (vu_long *)0xFE2001E8
  42 #define SH7751_PCIWCR2  (vu_long *)0xFE2001EC
  43 #define SH7751_PCIWCR3  (vu_long *)0xFE2001F0
  44 #define SH7751_PCIMCR   (vu_long *)0xFE2001F4
  45 #define SH7751_PCIBCR3  (vu_long *)0xFE2001F8
  46
  47 #define BCR1_BREQEN                             0x00080000
  48 #define PCI_SH7751_ID                   0x35051054
  49 #define PCI_SH7751R_ID                  0x350E1054
  50 #define SH7751_PCICONF1_WCC             0x00000080
  51 #define SH7751_PCICONF1_PER             0x00000040
  52 #define SH7751_PCICONF1_BUM             0x00000004
  53 #define SH7751_PCICONF1_MES             0x00000002
  54 #define SH7751_PCICONF1_CMDS    0x000000C6
  55 #define SH7751_PCI_HOST_BRIDGE  0x6
  56 #define SH7751_PCICR_PREFIX             0xa5000000
  57 #define SH7751_PCICR_PRST               0x00000002
  58 #define SH7751_PCICR_CFIN               0x00000001
  59 #define SH7751_PCIPINT_D3               0x00000002
  60 #define SH7751_PCIPINT_D0               0x00000001
  61 #define SH7751_PCICLKR_PREFIX   0xa5000000
  62
  63 #define SH7751_PCI_MEM_BASE             0xFD000000
  64 #define SH7751_PCI_MEM_SIZE             0x01000000
  65 #define SH7751_PCI_IO_BASE              0xFE240000
  66 #define SH7751_PCI_IO_SIZE              0x00040000
  67
  68 #define SH7751_PCIPAR   (vu_long *)0xFE2001C0
  69 #define SH7751_PCIPDR   (vu_long *)0xFE200220
  70
  71 #define p4_in(addr)     (*addr)
  72 #define p4_out(data, addr) (*addr) = (data)
  73
  74 /* Double word */
  75 int pci_sh4_read_config_dword(struct pci_controller *hose,
  76                               pci_dev_t dev, int offset, u32 *value)
  77 {
  78         u32 par_data = 0x80000000 | dev;
  79
  80         p4_out(par_data | (offset & 0xfc), SH7751_PCIPAR);
  81         *value = p4_in(SH7751_PCIPDR);
  82
  83         return 0;
  84 }
  85
  86 int pci_sh4_write_config_dword(struct pci_controller *hose,
  87                                pci_dev_t dev, int offset, u32 value)
  88 {
  89         u32 par_data = 0x80000000 | dev;
  90
  91         p4_out(par_data | (offset & 0xfc), SH7751_PCIPAR);
  92         p4_out(value, SH7751_PCIPDR);
  93
  94         return 0;
  95 }
  96
  97 int pci_sh7751_init(struct pci_controller *hose)
  98 {
  99         /* Double-check that we're a 7751 or 7751R chip */
 100         if (p4_in(SH7751_PCICONF0) != PCI_SH7751_ID
 101             && p4_in(SH7751_PCICONF0) != PCI_SH7751R_ID) {
 102                 printf("PCI: Unknown PCI host bridge.\n");
 103                 return 1;
 104         }
 105         printf("PCI: SH7751 PCI host bridge found.\n");
 106
 107         /* Double-check some BSC config settings */
 108         /* (Area 3 non-MPX 32-bit, PCI bus pins) */
 109         if ((p4_in(SH7751_BCR1) & 0x20008) == 0x20000) {
 110                 printf("SH7751_BCR1 value is wrong(0x%08X)\n",
 111                         (unsigned int)p4_in(SH7751_BCR1));
 112                 return 2;
 113         }
 114         if ((p4_in(SH7751_BCR2) & 0xC0) != 0xC0) {
 115                 printf("SH7751_BCR2 value is wrong(0x%08X)\n",
 116                         (unsigned int)p4_in(SH7751_BCR2));
 117                 return 3;
 118         }
 119         if (p4_in(SH7751_BCR2) & 0x01) {
 120                 printf("SH7751_BCR2 value is wrong(0x%08X)\n",
 121                         (unsigned int)p4_in(SH7751_BCR2));
 122                 return 4;
 123         }
 124
 125         /* Force BREQEN in BCR1 to allow PCIC access */
 126         p4_out((p4_in(SH7751_BCR1) | BCR1_BREQEN), SH7751_BCR1);
 127
 128         /* Toggle PCI reset pin */
 129         p4_out((SH7751_PCICR_PREFIX | SH7751_PCICR_PRST), SH7751_PCICR);
 130         udelay(32);
 131         p4_out(SH7751_PCICR_PREFIX, SH7751_PCICR);
 132
 133         /* Set cmd bits: WCC, PER, BUM, MES */
 134         /* (Addr/Data stepping, Parity enabled, Bus Master, Memory enabled) */
 135         p4_out(0xfb900047, SH7751_PCICONF1);    /* K.Kino */
 136
 137         /* Define this host as the host bridge */
 138         p4_out((SH7751_PCI_HOST_BRIDGE << 24), SH7751_PCICONF2);
 139
 140         /* Force PCI clock(s) on */
 141         p4_out(0, SH7751_PCICLKR);
 142         p4_out(0x03, SH7751_PCICLKR);
 143
 144         /* Clear powerdown IRQs, also mask them (unused) */
 145         p4_out((SH7751_PCIPINT_D0 | SH7751_PCIPINT_D3), SH7751_PCIPINT);
 146         p4_out(0, SH7751_PCIPINTM);
 147
 148         p4_out(0xab000001, SH7751_PCICONF4);
 149
 150         /* Set up target memory mappings (for external DMA access) */
 151         /* Map both P0 and P2 range to Area 3 RAM for ease of use */
 152         p4_out(CONFIG_SYS_SDRAM_SIZE - 0x100000, SH7751_PCILSR0);
 153         p4_out(CONFIG_SYS_SDRAM_BASE & 0x1FF00000, SH7751_PCILAR0);
 154         p4_out(CONFIG_SYS_SDRAM_BASE & 0xFFF00000, SH7751_PCICONF5);
 155
 156         p4_out(0, SH7751_PCILSR1);
 157         p4_out(0, SH7751_PCILAR1);
 158         p4_out(0xd0000000, SH7751_PCICONF6);
 159
 160         /* Map memory window to same address on PCI bus */
 161         p4_out(SH7751_PCI_MEM_BASE, SH7751_PCIMBR);
 162
 163         /* Map IO window to same address on PCI bus */
 164         p4_out(SH7751_PCI_IO_BASE, SH7751_PCIIOBR);
 165
 166         /* set BREQEN */
 167         p4_out(inl(SH7751_BCR1) | 0x00080000, SH7751_BCR1);
 168
 169         /* Copy BSC registers into PCI BSC */
 170         p4_out(inl(SH7751_BCR1), SH7751_PCIBCR1);
 171         p4_out(inw(SH7751_BCR2), SH7751_PCIBCR2);
 172         p4_out(inw(SH7751_BCR3), SH7751_PCIBCR3);
 173         p4_out(inl(SH7751_WCR1), SH7751_PCIWCR1);
 174         p4_out(inl(SH7751_WCR2), SH7751_PCIWCR2);
 175         p4_out(inl(SH7751_WCR3), SH7751_PCIWCR3);
 176         p4_out(inl(SH7751_MCR), SH7751_PCIMCR);
 177
 178         /* Finally, set central function init complete */
 179         p4_out((SH7751_PCICR_PREFIX | SH7751_PCICR_CFIN), SH7751_PCICR);
 180
 181         pci_sh4_init(hose);
 182
 183         return 0;
 184 }