target/linux/adm5120/files/arch/mips/pci/pci-adm5120.c

   1 /*
   2  *  ADM5120 PCI Host Controller driver
   3  *
   4  *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This code was based on the ADM5120 specific port of the Linux 2.6.10 kernel
   7  *  done by Jeroen Vreeken
   8  *      Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
   9  *
  10  *  Jeroen's code was based on the Linux 2.4.xx source codes found in various
  11  *  tarballs released by Edimax for it's ADM5120 based devices
  12  *      Copyright (C) ADMtek Incorporated
  13  *
  14  *  This program is free software; you can redistribute it and/or modify it
  15  *  under the terms of the GNU General Public License version 2 as published
  16  *  by the Free Software Foundation.
  17  *
  18  */
  19 #include <linux/types.h>
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/io.h>
  24
  25 #include <linux/pci.h>
  26 #include <linux/pci_ids.h>
  27 #include <linux/pci_regs.h>
  28
  29 #include <asm/delay.h>
  30 #include <asm/bootinfo.h>
  31
  32 #include <asm/mach-adm5120/adm5120_defs.h>
  33 #include <asm/mach-adm5120/adm5120_info.h>
  34 #include <asm/mach-adm5120/adm5120_defs.h>
  35 #include <asm/mach-adm5120/adm5120_platform.h>
  36
  37 #undef DEBUG
  38
  39 #ifdef DEBUG
  40 #define DBG(f, a...)    printk(KERN_DEBUG f, ## a)
  41 #else
  42 #define DBG(f, a...)    do {} while (0)
  43 #endif
  44
  45 #define PCI_ENABLE 0x80000000
  46
  47 /* -------------------------------------------------------------------------*/
  48
  49 static unsigned int adm5120_pci_nr_irqs __initdata;
  50 static struct adm5120_pci_irq *adm5120_pci_irq_map __initdata;
  51
  52 static spinlock_t pci_lock = SPIN_LOCK_UNLOCKED;
  53
  54 /* -------------------------------------------------------------------------*/
  55
  56 static inline void write_cfgaddr(u32 addr)
  57 {
  58         __raw_writel((addr | PCI_ENABLE),
  59                 (void __iomem *)(KSEG1ADDR(ADM5120_PCICFG_ADDR)));
  60 }
  61
  62 static inline void write_cfgdata(u32 data)
  63 {
  64         __raw_writel(data, (void __iomem *)KSEG1ADDR(ADM5120_PCICFG_DATA));
  65 }
  66
  67 static inline u32 read_cfgdata(void)
  68 {
  69         return __raw_readl((void __iomem *)KSEG1ADDR(ADM5120_PCICFG_DATA));
  70 }
  71
  72 static inline u32 mkaddr(struct pci_bus *bus, unsigned int devfn, int where)
  73 {
  74         return (((bus->number & 0xFF) << 16) | ((devfn & 0xFF) << 8) | \
  75                 (where & 0xFC));
  76 }
  77
  78 /* -------------------------------------------------------------------------*/
  79
  80 static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
  81                 int size, u32 *val)
  82 {
  83         unsigned long flags;
  84         u32 data;
  85
  86         spin_lock_irqsave(&pci_lock, flags);
  87
  88         write_cfgaddr(mkaddr(bus, devfn, where));
  89         data = read_cfgdata();
  90
  91         DBG("PCI: cfg_read  %02u.%02u.%01u/%02X:%01d, cfg:0x%08X",
  92                 bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
  93                 where, size, data);
  94
  95         switch (size) {
  96         case 1:
  97                 if (where & 1)
  98                         data >>= 8;
  99                 if (where & 2)
 100                         data >>= 16;
 101                 data &= 0xFF;
 102                 break;
 103         case 2:
 104                 if (where & 2)
 105                         data >>= 16;
 106                 data &= 0xFFFF;
 107                 break;
 108         }
 109
 110         *val = data;
 111         DBG(", 0x%08X returned\n", data);
 112
 113         spin_unlock_irqrestore(&pci_lock, flags);
 114
 115         return PCIBIOS_SUCCESSFUL;
 116 }
 117
 118 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
 119                 int size, u32 val)
 120 {
 121         unsigned long flags;
 122         u32 data;
 123         int s;
 124
 125         spin_lock_irqsave(&pci_lock, flags);
 126
 127         write_cfgaddr(mkaddr(bus, devfn, where));
 128         data = read_cfgdata();
 129
 130         DBG("PCI: cfg_write %02u.%02u.%01u/%02X:%01d, cfg:0x%08X",
 131                 bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
 132                 where, size, data);
 133
 134         switch (size) {
 135         case 1:
 136                 s = ((where & 3) << 3);
 137                 data &= ~(0xFF << s);
 138                 data |= ((val & 0xFF) << s);
 139                 break;
 140         case 2:
 141                 s = ((where & 2) << 4);
 142                 data &= ~(0xFFFF << s);
 143                 data |= ((val & 0xFFFF) << s);
 144                 break;
 145         case 4:
 146                 data = val;
 147                 break;
 148         }
 149
 150         write_cfgdata(data);
 151         DBG(", 0x%08X written\n", data);
 152
 153         spin_unlock_irqrestore(&pci_lock, flags);
 154
 155         return PCIBIOS_SUCCESSFUL;
 156 }
 157
 158 struct pci_ops adm5120_pci_ops = {
 159         .read   = pci_config_read,
 160         .write  = pci_config_write,
 161 };
 162
 163 /* -------------------------------------------------------------------------*/
 164
 165 static void adm5120_pci_fixup(struct pci_dev *dev)
 166 {
 167         if (dev->devfn != 0)
 168                 return;
 169
 170         /* setup COMMAND register */
 171         pci_write_config_word(dev, PCI_COMMAND,
 172                 (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER));
 173
 174         /* setup CACHE_LINE_SIZE register */
 175         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 4);
 176
 177         /* setup BARS */
 178         pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0);
 179         pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);
 180 }
 181
 182 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ADMTEK, PCI_DEVICE_ID_ADMTEK_ADM5120,
 183         adm5120_pci_fixup);
 184
 185 /* -------------------------------------------------------------------------*/
 186
 187 void __init adm5120_pci_set_irq_map(unsigned int nr_irqs,
 188                 struct adm5120_pci_irq *map)
 189 {
 190         adm5120_pci_nr_irqs = nr_irqs;
 191         adm5120_pci_irq_map = map;
 192 }
 193
 194 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 195 {
 196         int irq = -1;
 197         int i;
 198
 199         if ((!adm5120_pci_nr_irqs) || (!adm5120_pci_irq_map)) {
 200                 printk(KERN_ALERT "PCI: pci_irq_map is not initialized\n");
 201                 goto out;
 202         }
 203
 204         if (slot < 1 || slot > 3) {
 205                 printk(KERN_ALERT "PCI: slot number %u is not supported\n",
 206                         slot);
 207                 goto out;
 208         }
 209
 210         for (i = 0; i < adm5120_pci_nr_irqs; i++) {
 211                 if ((adm5120_pci_irq_map[i].slot == slot)
 212                         && (adm5120_pci_irq_map[i].func == PCI_FUNC(dev->devfn))
 213                         && (adm5120_pci_irq_map[i].pin == pin)) {
 214                         irq = adm5120_pci_irq_map[i].irq;
 215                         break;
 216                 }
 217         }
 218
 219         if (irq < 0) {
 220                 printk(KERN_ALERT "PCI: no irq found for %s pin:%u\n",
 221                         pci_name((struct pci_dev *)dev), pin);
 222         } else {
 223                 printk(KERN_INFO "PCI: mapping irq for %s pin:%u, irq:%d\n",
 224                         pci_name((struct pci_dev *)dev), pin, irq);
 225         }
 226
 227 out:
 228         return irq;
 229 }
 230
 231 int pcibios_plat_dev_init(struct pci_dev *dev)
 232 {
 233         return 0;
 234 }
 235
 236 /* -------------------------------------------------------------------------*/
 237
 238 static struct resource pci_io_resource = {
 239         .name   = "ADM5120 PCI I/O",
 240         .start  = ADM5120_PCIIO_BASE,
 241         .end    = ADM5120_PCICFG_ADDR-1,
 242         .flags  = IORESOURCE_IO
 243 };
 244
 245 static struct resource pci_mem_resource = {
 246         .name   = "ADM5120 PCI MEM",
 247         .start  = ADM5120_PCIMEM_BASE,
 248         .end    = ADM5120_PCIIO_BASE-1,
 249         .flags  = IORESOURCE_MEM
 250 };
 251
 252 static struct pci_controller adm5120_controller = {
 253         .pci_ops        = &adm5120_pci_ops,
 254         .io_resource    = &pci_io_resource,
 255         .mem_resource   = &pci_mem_resource,
 256 };
 257
 258 static int __init adm5120_pci_setup(void)
 259 {
 260         if (adm5120_package_pqfp()) {
 261                 printk(KERN_INFO "PCI: not available on ADM5120P\n");
 262                 return -1;
 263         }
 264
 265         /* Avoid ISA compat ranges.  */
 266         PCIBIOS_MIN_IO = 0x00000000;
 267         PCIBIOS_MIN_MEM = 0x00000000;
 268
 269         /* Set I/O resource limits.  */
 270         ioport_resource.end = 0x1fffffff;
 271         iomem_resource.end = 0xffffffff;
 272
 273         register_pci_controller(&adm5120_controller);
 274         return 0;
 275 }
 276
 277 arch_initcall(adm5120_pci_setup);