arch/s390/include/asm/pci_io.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_S390_PCI_IO_H
   3 #define _ASM_S390_PCI_IO_H
   4
   5 #ifdef CONFIG_PCI
   6
   7 #include <linux/kernel.h>
   8 #include <linux/slab.h>
   9 #include <asm/pci_insn.h>
  10
  11 /* I/O Map */
  12 #define ZPCI_IOMAP_SHIFT                48
  13 #define ZPCI_IOMAP_ADDR_BASE            0x8000000000000000UL
  14 #define ZPCI_IOMAP_ADDR_OFF_MASK        ((1UL << ZPCI_IOMAP_SHIFT) - 1)
  15 #define ZPCI_IOMAP_MAX_ENTRIES                                                  \
  16         ((ULONG_MAX - ZPCI_IOMAP_ADDR_BASE + 1) / (1UL << ZPCI_IOMAP_SHIFT))
  17 #define ZPCI_IOMAP_ADDR_IDX_MASK                                                \
  18         (~ZPCI_IOMAP_ADDR_OFF_MASK - ZPCI_IOMAP_ADDR_BASE)
  19
  20 struct zpci_iomap_entry {
  21         u32 fh;
  22         u8 bar;
  23         u16 count;
  24 };
  25
  26 extern struct zpci_iomap_entry *zpci_iomap_start;
  27
  28 #define ZPCI_ADDR(idx) (ZPCI_IOMAP_ADDR_BASE | ((u64) idx << ZPCI_IOMAP_SHIFT))
  29 #define ZPCI_IDX(addr)                                                          \
  30         (((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> ZPCI_IOMAP_SHIFT)
  31 #define ZPCI_OFFSET(addr)                                                       \
  32         ((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)
  33
  34 #define ZPCI_CREATE_REQ(handle, space, len)                                     \
  35         ((u64) handle << 32 | space << 16 | len)
  36
  37 #define zpci_read(LENGTH, RETTYPE)                                              \
  38 static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr)    \
  39 {                                                                               \
  40         u64 data;                                                               \
  41         int rc;                                                                 \
  42                                                                                 \
  43         rc = zpci_load(&data, addr, LENGTH);                                    \
  44         if (rc)                                                                 \
  45                 data = -1ULL;                                                   \
  46         return (RETTYPE) data;                                                  \
  47 }
  48
  49 #define zpci_write(LENGTH, VALTYPE)                                             \
  50 static inline void zpci_write_##VALTYPE(VALTYPE val,                            \
  51                                         const volatile void __iomem *addr)      \
  52 {                                                                               \
  53         u64 data = (VALTYPE) val;                                               \
  54                                                                                 \
  55         zpci_store(addr, data, LENGTH);                                         \
  56 }
  57
  58 zpci_read(8, u64)
  59 zpci_read(4, u32)
  60 zpci_read(2, u16)
  61 zpci_read(1, u8)
  62 zpci_write(8, u64)
  63 zpci_write(4, u32)
  64 zpci_write(2, u16)
  65 zpci_write(1, u8)
  66
  67 static inline int zpci_write_single(volatile void __iomem *dst, const void *src,
  68                                     unsigned long len)
  69 {
  70         u64 val;
  71
  72         switch (len) {
  73         case 1:
  74                 val = (u64) *((u8 *) src);
  75                 break;
  76         case 2:
  77                 val = (u64) *((u16 *) src);
  78                 break;
  79         case 4:
  80                 val = (u64) *((u32 *) src);
  81                 break;
  82         case 8:
  83                 val = (u64) *((u64 *) src);
  84                 break;
  85         default:
  86                 val = 0;                /* let FW report error */
  87                 break;
  88         }
  89         return zpci_store(dst, val, len);
  90 }
  91
  92 static inline int zpci_read_single(void *dst, const volatile void __iomem *src,
  93                                    unsigned long len)
  94 {
  95         u64 data;
  96         int cc;
  97
  98         cc = zpci_load(&data, src, len);
  99         if (cc)
 100                 goto out;
 101
 102         switch (len) {
 103         case 1:
 104                 *((u8 *) dst) = (u8) data;
 105                 break;
 106         case 2:
 107                 *((u16 *) dst) = (u16) data;
 108                 break;
 109         case 4:
 110                 *((u32 *) dst) = (u32) data;
 111                 break;
 112         case 8:
 113                 *((u64 *) dst) = (u64) data;
 114                 break;
 115         }
 116 out:
 117         return cc;
 118 }
 119
 120 int zpci_write_block(volatile void __iomem *dst, const void *src,
 121                      unsigned long len);
 122
 123 static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
 124 {
 125         int count = len > max ? max : len, size = 1;
 126
 127         while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
 128                 dst = dst >> 1;
 129                 src = src >> 1;
 130                 size = size << 1;
 131         }
 132         return size;
 133 }
 134
 135 static inline int zpci_memcpy_fromio(void *dst,
 136                                      const volatile void __iomem *src,
 137                                      unsigned long n)
 138 {
 139         int size, rc = 0;
 140
 141         while (n > 0) {
 142                 size = zpci_get_max_write_size((u64 __force) src,
 143                                                (u64) dst, n, 8);
 144                 rc = zpci_read_single(dst, src, size);
 145                 if (rc)
 146                         break;
 147                 src += size;
 148                 dst += size;
 149                 n -= size;
 150         }
 151         return rc;
 152 }
 153
 154 static inline int zpci_memcpy_toio(volatile void __iomem *dst,
 155                                    const void *src, unsigned long n)
 156 {
 157         int size, rc = 0;
 158
 159         if (!src)
 160                 return -EINVAL;
 161
 162         while (n > 0) {
 163                 size = zpci_get_max_write_size((u64 __force) dst,
 164                                                (u64) src, n, 128);
 165                 if (size > 8) /* main path */
 166                         rc = zpci_write_block(dst, src, size);
 167                 else
 168                         rc = zpci_write_single(dst, src, size);
 169                 if (rc)
 170                         break;
 171                 src += size;
 172                 dst += size;
 173                 n -= size;
 174         }
 175         return rc;
 176 }
 177
 178 static inline int zpci_memset_io(volatile void __iomem *dst,
 179                                  unsigned char val, size_t count)
 180 {
 181         u8 *src = kmalloc(count, GFP_KERNEL);
 182         int rc;
 183
 184         if (src == NULL)
 185                 return -ENOMEM;
 186         memset(src, val, count);
 187
 188         rc = zpci_memcpy_toio(dst, src, count);
 189         kfree(src);
 190         return rc;
 191 }
 192
 193 #endif /* CONFIG_PCI */
 194
 195 #endif /* _ASM_S390_PCI_IO_H */