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