arch/s390/pci/pci_insn.c

   1 /*
   2  * s390 specific pci instructions
   3  *
   4  * Copyright IBM Corp. 2013
   5  */
   6
   7 #include <linux/export.h>
   8 #include <linux/errno.h>
   9 #include <linux/delay.h>
  10 #include <asm/pci_insn.h>
  11 #include <asm/pci_debug.h>
  12 #include <asm/processor.h>
  13
  14 #define ZPCI_INSN_BUSY_DELAY    1       /* 1 microsecond */
  15
  16 static inline void zpci_err_insn(u8 cc, u8 status, u64 req, u64 offset)
  17 {
  18         struct {
  19                 u64 req;
  20                 u64 offset;
  21                 u8 cc;
  22                 u8 status;
  23         } __packed data = {req, offset, cc, status};
  24
  25         zpci_err_hex(&data, sizeof(data));
  26 }
  27
  28 /* Modify PCI Function Controls */
  29 static inline u8 __mpcifc(u64 req, struct zpci_fib *fib, u8 *status)
  30 {
  31         u8 cc;
  32
  33         asm volatile (
  34                 "       .insn   rxy,0xe300000000d0,%[req],%[fib]\n"
  35                 "       ipm     %[cc]\n"
  36                 "       srl     %[cc],28\n"
  37                 : [cc] "=d" (cc), [req] "+d" (req), [fib] "+Q" (*fib)
  38                 : : "cc");
  39         *status = req >> 24 & 0xff;
  40         return cc;
  41 }
  42
  43 int zpci_mod_fc(u64 req, struct zpci_fib *fib)
  44 {
  45         u8 cc, status;
  46
  47         do {
  48                 cc = __mpcifc(req, fib, &status);
  49                 if (cc == 2)
  50                         msleep(ZPCI_INSN_BUSY_DELAY);
  51         } while (cc == 2);
  52
  53         if (cc)
  54                 zpci_err_insn(cc, status, req, 0);
  55
  56         return (cc) ? -EIO : 0;
  57 }
  58
  59 /* Refresh PCI Translations */
  60 static inline u8 __rpcit(u64 fn, u64 addr, u64 range, u8 *status)
  61 {
  62         register u64 __addr asm("2") = addr;
  63         register u64 __range asm("3") = range;
  64         u8 cc;
  65
  66         asm volatile (
  67                 "       .insn   rre,0xb9d30000,%[fn],%[addr]\n"
  68                 "       ipm     %[cc]\n"
  69                 "       srl     %[cc],28\n"
  70                 : [cc] "=d" (cc), [fn] "+d" (fn)
  71                 : [addr] "d" (__addr), "d" (__range)
  72                 : "cc");
  73         *status = fn >> 24 & 0xff;
  74         return cc;
  75 }
  76
  77 int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
  78 {
  79         u8 cc, status;
  80
  81         do {
  82                 cc = __rpcit(fn, addr, range, &status);
  83                 if (cc == 2)
  84                         udelay(ZPCI_INSN_BUSY_DELAY);
  85         } while (cc == 2);
  86
  87         if (cc)
  88                 zpci_err_insn(cc, status, addr, range);
  89
  90         return (cc) ? -EIO : 0;
  91 }
  92
  93 /* Set Interruption Controls */
  94 void zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc)
  95 {
  96         asm volatile (
  97                 "       .insn   rsy,0xeb00000000d1,%[ctl],%[isc],%[u]\n"
  98                 : : [ctl] "d" (ctl), [isc] "d" (isc << 27), [u] "Q" (*unused));
  99 }
 100
 101 /* PCI Load */
 102 static inline int __pcilg(u64 *data, u64 req, u64 offset, u8 *status)
 103 {
 104         register u64 __req asm("2") = req;
 105         register u64 __offset asm("3") = offset;
 106         int cc = -ENXIO;
 107         u64 __data;
 108
 109         asm volatile (
 110                 "       .insn   rre,0xb9d20000,%[data],%[req]\n"
 111                 "0:     ipm     %[cc]\n"
 112                 "       srl     %[cc],28\n"
 113                 "1:\n"
 114                 EX_TABLE(0b, 1b)
 115                 : [cc] "+d" (cc), [data] "=d" (__data), [req] "+d" (__req)
 116                 :  "d" (__offset)
 117                 : "cc");
 118         *status = __req >> 24 & 0xff;
 119         if (!cc)
 120                 *data = __data;
 121
 122         return cc;
 123 }
 124
 125 int zpci_load(u64 *data, u64 req, u64 offset)
 126 {
 127         u8 status;
 128         int cc;
 129
 130         do {
 131                 cc = __pcilg(data, req, offset, &status);
 132                 if (cc == 2)
 133                         udelay(ZPCI_INSN_BUSY_DELAY);
 134         } while (cc == 2);
 135
 136         if (cc)
 137                 zpci_err_insn(cc, status, req, offset);
 138
 139         return (cc > 0) ? -EIO : cc;
 140 }
 141 EXPORT_SYMBOL_GPL(zpci_load);
 142
 143 /* PCI Store */
 144 static inline int __pcistg(u64 data, u64 req, u64 offset, u8 *status)
 145 {
 146         register u64 __req asm("2") = req;
 147         register u64 __offset asm("3") = offset;
 148         int cc = -ENXIO;
 149
 150         asm volatile (
 151                 "       .insn   rre,0xb9d00000,%[data],%[req]\n"
 152                 "0:     ipm     %[cc]\n"
 153                 "       srl     %[cc],28\n"
 154                 "1:\n"
 155                 EX_TABLE(0b, 1b)
 156                 : [cc] "+d" (cc), [req] "+d" (__req)
 157                 : "d" (__offset), [data] "d" (data)
 158                 : "cc");
 159         *status = __req >> 24 & 0xff;
 160         return cc;
 161 }
 162
 163 int zpci_store(u64 data, u64 req, u64 offset)
 164 {
 165         u8 status;
 166         int cc;
 167
 168         do {
 169                 cc = __pcistg(data, req, offset, &status);
 170                 if (cc == 2)
 171                         udelay(ZPCI_INSN_BUSY_DELAY);
 172         } while (cc == 2);
 173
 174         if (cc)
 175                 zpci_err_insn(cc, status, req, offset);
 176
 177         return (cc > 0) ? -EIO : cc;
 178 }
 179 EXPORT_SYMBOL_GPL(zpci_store);
 180
 181 /* PCI Store Block */
 182 static inline int __pcistb(const u64 *data, u64 req, u64 offset, u8 *status)
 183 {
 184         int cc = -ENXIO;
 185
 186         asm volatile (
 187                 "       .insn   rsy,0xeb00000000d0,%[req],%[offset],%[data]\n"
 188                 "0:     ipm     %[cc]\n"
 189                 "       srl     %[cc],28\n"
 190                 "1:\n"
 191                 EX_TABLE(0b, 1b)
 192                 : [cc] "+d" (cc), [req] "+d" (req)
 193                 : [offset] "d" (offset), [data] "Q" (*data)
 194                 : "cc");
 195         *status = req >> 24 & 0xff;
 196         return cc;
 197 }
 198
 199 int zpci_store_block(const u64 *data, u64 req, u64 offset)
 200 {
 201         u8 status;
 202         int cc;
 203
 204         do {
 205                 cc = __pcistb(data, req, offset, &status);
 206                 if (cc == 2)
 207                         udelay(ZPCI_INSN_BUSY_DELAY);
 208         } while (cc == 2);
 209
 210         if (cc)
 211                 zpci_err_insn(cc, status, req, offset);
 212
 213         return (cc > 0) ? -EIO : cc;
 214 }
 215 EXPORT_SYMBOL_GPL(zpci_store_block);