target/linux/ar71xx/files/arch/mips/ath79/pci-ath9k-fixup.c

   1 /*
   2  *  Atheros AP94 reference board PCI initialization
   3  *
   4  *  Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  */
  10
  11 #include <linux/pci.h>
  12 #include <linux/delay.h>
  13
  14 #include <asm/mach-ath79/ar71xx_regs.h>
  15 #include <asm/mach-ath79/ath79.h>
  16
  17 struct ath9k_fixup {
  18         u16             *cal_data;
  19         unsigned        slot;
  20 };
  21
  22 static int ath9k_num_fixups;
  23 static struct ath9k_fixup ath9k_fixups[2];
  24
  25 static void ath9k_pci_fixup(struct pci_dev *dev)
  26 {
  27         void __iomem *mem;
  28         u16 *cal_data = NULL;
  29         u16 cmd;
  30         u32 bar0;
  31         u32 val;
  32         unsigned i;
  33
  34         for (i = 0; i < ath9k_num_fixups; i++) {
  35                 if (ath9k_fixups[i].cal_data == NULL)
  36                         continue;
  37
  38                 if (ath9k_fixups[i].slot != PCI_SLOT(dev->devfn))
  39                         continue;
  40
  41                 cal_data = ath9k_fixups[i].cal_data;
  42                 break;
  43         }
  44
  45         if (cal_data == NULL)
  46                 return;
  47
  48         if (*cal_data != 0xa55a) {
  49                 pr_err("pci %s: invalid calibration data\n", pci_name(dev));
  50                 return;
  51         }
  52
  53         pr_info("pci %s: fixup device configuration\n", pci_name(dev));
  54
  55         mem = ioremap(AR71XX_PCI_MEM_BASE, 0x10000);
  56         if (!mem) {
  57                 pr_err("pci %s: ioremap error\n", pci_name(dev));
  58                 return;
  59         }
  60
  61         pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &bar0);
  62
  63         switch (ath79_soc) {
  64         case ATH79_SOC_AR7161:
  65                 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
  66                                        AR71XX_PCI_MEM_BASE);
  67                 break;
  68         case ATH79_SOC_AR7240:
  69                 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0xffff);
  70                 break;
  71
  72         case ATH79_SOC_AR7241:
  73         case ATH79_SOC_AR7242:
  74                 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0x1000ffff);
  75                 break;
  76         case ATH79_SOC_AR9344:
  77                 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0x1000ffff);
  78                 break;
  79
  80         default:
  81                 BUG();
  82         }
  83
  84         pci_read_config_word(dev, PCI_COMMAND, &cmd);
  85         cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
  86         pci_write_config_word(dev, PCI_COMMAND, cmd);
  87
  88         /* set pointer to first reg address */
  89         cal_data += 3;
  90         while (*cal_data != 0xffff) {
  91                 u32 reg;
  92                 reg = *cal_data++;
  93                 val = *cal_data++;
  94                 val |= (*cal_data++) << 16;
  95
  96                 __raw_writel(val, mem + reg);
  97                 udelay(100);
  98         }
  99
 100         pci_read_config_dword(dev, PCI_VENDOR_ID, &val);
 101         dev->vendor = val & 0xffff;
 102         dev->device = (val >> 16) & 0xffff;
 103
 104         pci_read_config_dword(dev, PCI_CLASS_REVISION, &val);
 105         dev->revision = val & 0xff;
 106         dev->class = val >> 8; /* upper 3 bytes */
 107
 108         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 109         cmd &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
 110         pci_write_config_word(dev, PCI_COMMAND, cmd);
 111
 112         pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, bar0);
 113
 114         iounmap(mem);
 115 }
 116 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATHEROS, PCI_ANY_ID, ath9k_pci_fixup);
 117
 118 void __init pci_enable_ath9k_fixup(unsigned slot, u16 *cal_data)
 119 {
 120         if (ath9k_num_fixups >= ARRAY_SIZE(ath9k_fixups))
 121                 return;
 122
 123         ath9k_fixups[ath9k_num_fixups].slot = slot;
 124         ath9k_fixups[ath9k_num_fixups].cal_data = cal_data;
 125         ath9k_num_fixups++;
 126 }