hw/mst_fpga.c

   1 /*
   2  * PXA270-based Intel Mainstone platforms.
   3  * FPGA driver
   4  *
   5  * Copyright (c) 2007 by Armin Kuster <akuster@kama-aina.net> or
   6  *                                    <akuster@mvista.com>
   7  *
   8  * This code is licensed under the GNU GPL v2.
   9  */
  10 #include "hw.h"
  11 #include "pxa.h"
  12 #include "mainstone.h"
  13
  14 /* Mainstone FPGA for extern irqs */
  15 #define FPGA_GPIO_PIN   0
  16 #define MST_NUM_IRQS    16
  17 #define MST_LEDDAT1             0x10
  18 #define MST_LEDDAT2             0x14
  19 #define MST_LEDCTRL             0x40
  20 #define MST_GPSWR               0x60
  21 #define MST_MSCWR1              0x80
  22 #define MST_MSCWR2              0x84
  23 #define MST_MSCWR3              0x88
  24 #define MST_MSCRD               0x90
  25 #define MST_INTMSKENA   0xc0
  26 #define MST_INTSETCLR   0xd0
  27 #define MST_PCMCIA0             0xe0
  28 #define MST_PCMCIA1             0xe4
  29
  30 typedef struct mst_irq_state{
  31         qemu_irq *parent;
  32         qemu_irq *pins;
  33
  34         uint32_t prev_level;
  35         uint32_t leddat1;
  36         uint32_t leddat2;
  37         uint32_t ledctrl;
  38         uint32_t gpswr;
  39         uint32_t mscwr1;
  40         uint32_t mscwr2;
  41         uint32_t mscwr3;
  42         uint32_t mscrd;
  43         uint32_t intmskena;
  44         uint32_t intsetclr;
  45         uint32_t pcmcia0;
  46         uint32_t pcmcia1;
  47 }mst_irq_state;
  48
  49 static void
  50 mst_fpga_update_gpio(mst_irq_state *s)
  51 {
  52         uint32_t level, diff;
  53         int bit;
  54         level = s->prev_level ^ s->intsetclr;
  55
  56         for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
  57                 bit = ffs(diff) - 1;
  58                 qemu_set_irq(s->pins[bit], (level >> bit) & 1 );
  59         }
  60         s->prev_level = level;
  61 }
  62
  63 static void
  64 mst_fpga_set_irq(void *opaque, int irq, int level)
  65 {
  66         mst_irq_state *s = (mst_irq_state *)opaque;
  67
  68         if (level)
  69                 s->prev_level |= 1u << irq;
  70         else
  71                 s->prev_level &= ~(1u << irq);
  72
  73         if(s->intmskena & (1u << irq)) {
  74                 s->intsetclr = 1u << irq;
  75                 qemu_set_irq(s->parent[0], level);
  76         }
  77 }
  78
  79
  80 static uint32_t
  81 mst_fpga_readb(void *opaque, target_phys_addr_t addr)
  82 {
  83         mst_irq_state *s = (mst_irq_state *) opaque;
  84
  85         switch (addr) {
  86         case MST_LEDDAT1:
  87                 return s->leddat1;
  88         case MST_LEDDAT2:
  89                 return s->leddat2;
  90         case MST_LEDCTRL:
  91                 return s->ledctrl;
  92         case MST_GPSWR:
  93                 return s->gpswr;
  94         case MST_MSCWR1:
  95                 return s->mscwr1;
  96         case MST_MSCWR2:
  97                 return s->mscwr2;
  98         case MST_MSCWR3:
  99                 return s->mscwr3;
 100         case MST_MSCRD:
 101                 return s->mscrd;
 102         case MST_INTMSKENA:
 103                 return s->intmskena;
 104         case MST_INTSETCLR:
 105                 return s->intsetclr;
 106         case MST_PCMCIA0:
 107                 return s->pcmcia0;
 108         case MST_PCMCIA1:
 109                 return s->pcmcia1;
 110         default:
 111                 printf("Mainstone - mst_fpga_readb: Bad register offset "
 112                         REG_FMT " \n", addr);
 113         }
 114         return 0;
 115 }
 116
 117 static void
 118 mst_fpga_writeb(void *opaque, target_phys_addr_t addr, uint32_t value)
 119 {
 120         mst_irq_state *s = (mst_irq_state *) opaque;
 121         value &= 0xffffffff;
 122
 123         switch (addr) {
 124         case MST_LEDDAT1:
 125                 s->leddat1 = value;
 126                 break;
 127         case MST_LEDDAT2:
 128                 s->leddat2 = value;
 129                 break;
 130         case MST_LEDCTRL:
 131                 s->ledctrl = value;
 132                 break;
 133         case MST_GPSWR:
 134                 s->gpswr = value;
 135                 break;
 136         case MST_MSCWR1:
 137                 s->mscwr1 = value;
 138                 break;
 139         case MST_MSCWR2:
 140                 s->mscwr2 = value;
 141                 break;
 142         case MST_MSCWR3:
 143                 s->mscwr3 = value;
 144                 break;
 145         case MST_MSCRD:
 146                 s->mscrd =  value;
 147                 break;
 148         case MST_INTMSKENA:     /* Mask interupt */
 149                 s->intmskena = (value & 0xFEEFF);
 150                 mst_fpga_update_gpio(s);
 151                 break;
 152         case MST_INTSETCLR:     /* clear or set interrupt */
 153                 s->intsetclr = (value & 0xFEEFF);
 154                 break;
 155         case MST_PCMCIA0:
 156                 s->pcmcia0 = value;
 157                 break;
 158         case MST_PCMCIA1:
 159                 s->pcmcia1 = value;
 160                 break;
 161         default:
 162                 printf("Mainstone - mst_fpga_writeb: Bad register offset "
 163                         REG_FMT " \n", addr);
 164         }
 165 }
 166
 167 static CPUReadMemoryFunc * const mst_fpga_readfn[] = {
 168         mst_fpga_readb,
 169         mst_fpga_readb,
 170         mst_fpga_readb,
 171 };
 172 static CPUWriteMemoryFunc * const mst_fpga_writefn[] = {
 173         mst_fpga_writeb,
 174         mst_fpga_writeb,
 175         mst_fpga_writeb,
 176 };
 177
 178 static void
 179 mst_fpga_save(QEMUFile *f, void *opaque)
 180 {
 181         struct mst_irq_state *s = (mst_irq_state *) opaque;
 182
 183         qemu_put_be32s(f, &s->prev_level);
 184         qemu_put_be32s(f, &s->leddat1);
 185         qemu_put_be32s(f, &s->leddat2);
 186         qemu_put_be32s(f, &s->ledctrl);
 187         qemu_put_be32s(f, &s->gpswr);
 188         qemu_put_be32s(f, &s->mscwr1);
 189         qemu_put_be32s(f, &s->mscwr2);
 190         qemu_put_be32s(f, &s->mscwr3);
 191         qemu_put_be32s(f, &s->mscrd);
 192         qemu_put_be32s(f, &s->intmskena);
 193         qemu_put_be32s(f, &s->intsetclr);
 194         qemu_put_be32s(f, &s->pcmcia0);
 195         qemu_put_be32s(f, &s->pcmcia1);
 196 }
 197
 198 static int
 199 mst_fpga_load(QEMUFile *f, void *opaque, int version_id)
 200 {
 201         mst_irq_state *s = (mst_irq_state *) opaque;
 202
 203         qemu_get_be32s(f, &s->prev_level);
 204         qemu_get_be32s(f, &s->leddat1);
 205         qemu_get_be32s(f, &s->leddat2);
 206         qemu_get_be32s(f, &s->ledctrl);
 207         qemu_get_be32s(f, &s->gpswr);
 208         qemu_get_be32s(f, &s->mscwr1);
 209         qemu_get_be32s(f, &s->mscwr2);
 210         qemu_get_be32s(f, &s->mscwr3);
 211         qemu_get_be32s(f, &s->mscrd);
 212         qemu_get_be32s(f, &s->intmskena);
 213         qemu_get_be32s(f, &s->intsetclr);
 214         qemu_get_be32s(f, &s->pcmcia0);
 215         qemu_get_be32s(f, &s->pcmcia1);
 216         return 0;
 217 }
 218
 219 qemu_irq *mst_irq_init(PXA2xxState *cpu, uint32_t base, int irq)
 220 {
 221         mst_irq_state *s;
 222         int iomemtype;
 223         qemu_irq *qi;
 224
 225         s = (mst_irq_state  *)
 226                 qemu_mallocz(sizeof(mst_irq_state));
 227
 228         s->parent = &cpu->pic[irq];
 229
 230         /* alloc the external 16 irqs */
 231         qi  = qemu_allocate_irqs(mst_fpga_set_irq, s, MST_NUM_IRQS);
 232         s->pins = qi;
 233
 234         iomemtype = cpu_register_io_memory(mst_fpga_readfn,
 235                 mst_fpga_writefn, s);
 236         cpu_register_physical_memory(base, 0x00100000, iomemtype);
 237         register_savevm(NULL, "mainstone_fpga", 0, 0, mst_fpga_save,
 238                         mst_fpga_load, s);
 239         return qi;
 240 }