arch/alpha/kernel/core_polaris.c

   1 /*
   2  *      linux/arch/alpha/kernel/core_polaris.c
   3  *
   4  * POLARIS chip-specific code
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9 #include <linux/pci.h>
  10 #include <linux/sched.h>
  11 #include <linux/init.h>
  12
  13 #include <asm/system.h>
  14 #include <asm/ptrace.h>
  15 #include <asm/pci.h>
  16
  17 #define __EXTERN_INLINE inline
  18 #include <asm/io.h>
  19 #include <asm/core_polaris.h>
  20 #undef __EXTERN_INLINE
  21
  22 #include "proto.h"
  23 #include "pci_impl.h"
  24
  25 /*
  26  * BIOS32-style PCI interface:
  27  */
  28
  29 #define DEBUG_CONFIG 0
  30
  31 #if DEBUG_CONFIG
  32 # define DBG_CFG(args)  printk args
  33 #else
  34 # define DBG_CFG(args)
  35 #endif
  36
  37
  38 /*
  39  * Given a bus, device, and function number, compute resulting
  40  * configuration space address.  This is fairly straightforward
  41  * on POLARIS, since the chip itself generates Type 0 or Type 1
  42  * cycles automatically depending on the bus number (Bus 0 is
  43  * hardwired to Type 0, all others are Type 1.  Peer bridges
  44  * are not supported).
  45  *
  46  * All types:
  47  *
  48  *  3 3 3 3|3 3 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
  49  *  9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
  50  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  51  * |1|1|1|1|1|0|0|1|1|1|1|1|1|1|1|0|B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|x|x|
  52  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  53  *
  54  *      23:16   bus number (8 bits = 128 possible buses)
  55  *      15:11   Device number (5 bits)
  56  *      10:8    function number
  57  *       7:2    register number
  58  *
  59  * Notes:
  60  *      The function number selects which function of a multi-function device
  61  *      (e.g., scsi and ethernet).
  62  *
  63  *      The register selects a DWORD (32 bit) register offset.  Hence it
  64  *      doesn't get shifted by 2 bits as we want to "drop" the bottom two
  65  *      bits.
  66  */
  67
  68 static int
  69 mk_conf_addr(struct pci_dev *dev, int where, unsigned long *pci_addr, u8 *type1)
  70 {
  71         u8 bus = dev->bus->number;
  72         u8 device_fn = dev->devfn;
  73
  74         *type1 = (bus == 0) ? 0 : 1;
  75         *pci_addr = (bus << 16) | (device_fn << 8) | (where) |
  76                     POLARIS_DENSE_CONFIG_BASE;
  77
  78         DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x,"
  79                  " returning address 0x%p\n"
  80                  bus, device_fn, where, *pci_addr));
  81
  82         return 0;
  83 }
  84
  85 static int
  86 polaris_read_config_byte(struct pci_dev *dev, int where, u8 *value)
  87 {
  88         unsigned long pci_addr;
  89         unsigned char type1;
  90
  91         if (mk_conf_addr(dev, where, &pci_addr, &type1))
  92                 return PCIBIOS_DEVICE_NOT_FOUND;
  93
  94         *value = __kernel_ldbu(*(vucp)pci_addr);
  95         return PCIBIOS_SUCCESSFUL;
  96 }
  97
  98 static int
  99 polaris_read_config_word(struct pci_dev *dev, int where, u16 *value)
 100 {
 101         unsigned long pci_addr;
 102         unsigned char type1;
 103
 104         if (mk_conf_addr(dev, where, &pci_addr, &type1))
 105                 return PCIBIOS_DEVICE_NOT_FOUND;
 106
 107         *value = __kernel_ldwu(*(vusp)pci_addr);
 108         return PCIBIOS_SUCCESSFUL;
 109 }
 110
 111 static int
 112 polaris_read_config_dword(struct pci_dev *dev, int where, u32 *value)
 113 {
 114         unsigned long pci_addr;
 115         unsigned char type1;
 116
 117         if (mk_conf_addr(dev, where, &pci_addr, &type1))
 118                 return PCIBIOS_DEVICE_NOT_FOUND;
 119
 120         *value = *(vuip)pci_addr;
 121         return PCIBIOS_SUCCESSFUL;
 122 }
 123
 124 static int
 125 polaris_write_config_byte(struct pci_dev *dev, int where, u8 value)
 126 {
 127         unsigned long pci_addr;
 128         unsigned char type1;
 129
 130         if (mk_conf_addr(dev, where, &pci_addr, &type1))
 131                 return PCIBIOS_DEVICE_NOT_FOUND;
 132
 133         __kernel_stb(value, *(vucp)pci_addr);
 134         mb();
 135         __kernel_ldbu(*(vucp)pci_addr);
 136         return PCIBIOS_SUCCESSFUL;
 137 }
 138
 139 static int
 140 polaris_write_config_word(struct pci_dev *dev, int where, u16 value)
 141 {
 142         unsigned long pci_addr;
 143         unsigned char type1;
 144
 145         if (mk_conf_addr(dev, where, &pci_addr, &type1))
 146                 return PCIBIOS_DEVICE_NOT_FOUND;
 147
 148         __kernel_stw(value, *(vusp)pci_addr);
 149         mb();
 150         __kernel_ldbu(*(vusp)pci_addr);
 151         return PCIBIOS_SUCCESSFUL;
 152 }
 153
 154 static int
 155 polaris_write_config_dword(struct pci_dev *dev, int where, u32 value)
 156 {
 157         unsigned long pci_addr;
 158         unsigned char type1;
 159
 160         if (mk_conf_addr(dev, where, &pci_addr, &type1))
 161                 return PCIBIOS_DEVICE_NOT_FOUND;
 162
 163         *(vuip)pci_addr = value;
 164         mb();
 165         *(vuip)pci_addr;
 166         return PCIBIOS_SUCCESSFUL;
 167 }
 168
 169 struct pci_ops polaris_pci_ops =
 170 {
 171         read_byte:      polaris_read_config_byte,
 172         read_word:      polaris_read_config_word,
 173         read_dword:     polaris_read_config_dword,
 174         write_byte:     polaris_write_config_byte,
 175         write_word:     polaris_write_config_word,
 176         write_dword:    polaris_write_config_dword
 177 };
 178 \f
 179 void __init
 180 polaris_init_arch(unsigned long *mem_start, unsigned long *mem_end)
 181 {
 182         struct pci_controler *hose;
 183
 184         /* May need to initialize error reporting (see PCICTL0/1), but
 185          * for now assume that the firmware has done the right thing
 186          * already.
 187          */
 188 #if 0
 189         printk("polaris_init_arch(): trusting firmware for setup\n");
 190 #endif
 191
 192         /*
 193          * Create our single hose.
 194          */
 195
 196         hose = alloc_pci_controler(mem_start);
 197         hose->io_space = &ioport_resource;
 198         hose->mem_space = &iomem_resource;
 199         hose->config_space = POLARIS_DENSE_CONFIG_BASE;
 200         hose->index = 0;
 201 }
 202
 203 static inline void
 204 polaris_pci_clr_err(void)
 205 {
 206         *(vusp)POLARIS_W_STATUS;
 207         /* Write 1's to settable bits to clear errors */
 208         *(vusp)POLARIS_W_STATUS = 0x7800;
 209         mb();
 210         *(vusp)POLARIS_W_STATUS;
 211 }
 212
 213 void
 214 polaris_machine_check(unsigned long vector, unsigned long la_ptr,
 215                       struct pt_regs * regs)
 216 {
 217         /* Clear the error before any reporting.  */
 218         mb();
 219         mb();
 220         draina();
 221         polaris_pci_clr_err();
 222         wrmces(0x7);
 223         mb();
 224
 225         process_mcheck_info(vector, la_ptr, regs, "POLARIS",
 226                             mcheck_expected(0));
 227 }