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_BASE                MST_FPGA_PHYS
  18 #define MST_LEDDAT1             0x10
  19 #define MST_LEDDAT2             0x14
  20 #define MST_LEDCTRL             0x40
  21 #define MST_GPSWR               0x60
  22 #define MST_MSCWR1              0x80
  23 #define MST_MSCWR2              0x84
  24 #define MST_MSCWR3              0x88
  25 #define MST_MSCRD               0x90
  26 #define MST_INTMSKENA   0xc0
  27 #define MST_INTSETCLR   0xd0
  28 #define MST_PCMCIA0             0xe0
  29 #define MST_PCMCIA1             0xe4
  30
  31 typedef struct mst_irq_state{
  32         target_phys_addr_t target_base;
  33         qemu_irq *parent;
  34         qemu_irq *pins;
  35
  36         uint32_t prev_level;
  37         uint32_t leddat1;
  38         uint32_t leddat2;
  39         uint32_t ledctrl;
  40         uint32_t gpswr;
  41         uint32_t mscwr1;
  42         uint32_t mscwr2;
  43         uint32_t mscwr3;
  44         uint32_t mscrd;
  45         uint32_t intmskena;
  46         uint32_t intsetclr;
  47         uint32_t pcmcia0;
  48         uint32_t pcmcia1;
  49 }mst_irq_state;
  50
  51 static void
  52 mst_fpga_update_gpio(mst_irq_state *s)
  53 {
  54         uint32_t level, diff;
  55         int bit;
  56         level = s->prev_level ^ s->intsetclr;
  57
  58         for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
  59                 bit = ffs(diff) - 1;
  60                 qemu_set_irq(s->pins[bit], (level >> bit) & 1 );
  61         }
  62         s->prev_level = level;
  63 }
  64
  65 static void
  66 mst_fpga_set_irq(void *opaque, int irq, int level)
  67 {
  68         mst_irq_state *s = (mst_irq_state *)opaque;
  69
  70         if (level)
  71                 s->prev_level |= 1u << irq;
  72         else
  73                 s->prev_level &= ~(1u << irq);
  74
  75         if(s->intmskena & (1u << irq)) {
  76                 s->intsetclr = 1u << irq;
  77                 qemu_set_irq(s->parent[0], level);
  78         }
  79 }
  80
  81
  82 static uint32_t
  83 mst_fpga_readb(void *opaque, target_phys_addr_t addr)
  84 {
  85         mst_irq_state *s = (mst_irq_state *) opaque;
  86         addr -= s->target_base;
  87
  88         switch (addr) {
  89         case MST_LEDDAT1:
  90                 return s->leddat1;
  91         case MST_LEDDAT2:
  92                 return s->leddat2;
  93         case MST_LEDCTRL:
  94                 return s->ledctrl;
  95         case MST_GPSWR:
  96                 return s->gpswr;
  97         case MST_MSCWR1:
  98                 return s->mscwr1;
  99         case MST_MSCWR2:
 100                 return s->mscwr2;
 101         case MST_MSCWR3:
 102                 return s->mscwr3;
 103         case MST_MSCRD:
 104                 return s->mscrd;
 105         case MST_INTMSKENA:
 106                 return s->intmskena;
 107         case MST_INTSETCLR:
 108                 return s->intsetclr;
 109         case MST_PCMCIA0:
 110                 return s->pcmcia0;
 111         case MST_PCMCIA1:
 112                 return s->pcmcia1;
 113         default:
 114                 printf("Mainstone - mst_fpga_readb: Bad register offset "
 115                         REG_FMT " \n", addr);
 116         }
 117         return 0;
 118 }
 119
 120 static void
 121 mst_fpga_writeb(void *opaque, target_phys_addr_t addr, uint32_t value)
 122 {
 123         mst_irq_state *s = (mst_irq_state *) opaque;
 124         addr -= s->target_base;
 125         value &= 0xffffffff;
 126
 127         switch (addr) {
 128         case MST_LEDDAT1:
 129                 s->leddat1 = value;
 130                 break;
 131         case MST_LEDDAT2:
 132                 s->leddat2 = value;
 133                 break;
 134         case MST_LEDCTRL:
 135                 s->ledctrl = value;
 136                 break;
 137         case MST_GPSWR:
 138                 s->gpswr = value;
 139                 break;
 140         case MST_MSCWR1:
 141                 s->mscwr1 = value;
 142                 break;
 143         case MST_MSCWR2:
 144                 s->mscwr2 = value;
 145                 break;
 146         case MST_MSCWR3:
 147                 s->mscwr3 = value;
 148                 break;
 149         case MST_MSCRD:
 150                 s->mscrd =  value;
 151                 break;
 152         case MST_INTMSKENA:     /* Mask interupt */
 153                 s->intmskena = (value & 0xFEEFF);
 154                 mst_fpga_update_gpio(s);
 155                 break;
 156         case MST_INTSETCLR:     /* clear or set interrupt */
 157                 s->intsetclr = (value & 0xFEEFF);
 158                 break;
 159         case MST_PCMCIA0:
 160                 s->pcmcia0 = value;
 161                 break;
 162         case MST_PCMCIA1:
 163                 s->pcmcia1 = value;
 164                 break;
 165         default:
 166                 printf("Mainstone - mst_fpga_writeb: Bad register offset "
 167                         REG_FMT " \n", addr);
 168         }
 169 }
 170
 171 static CPUReadMemoryFunc *mst_fpga_readfn[] = {
 172         mst_fpga_readb,
 173         mst_fpga_readb,
 174         mst_fpga_readb,
 175 };
 176 static CPUWriteMemoryFunc *mst_fpga_writefn[] = {
 177         mst_fpga_writeb,
 178         mst_fpga_writeb,
 179         mst_fpga_writeb,
 180 };
 181
 182 static void
 183 mst_fpga_save(QEMUFile *f, void *opaque)
 184 {
 185         struct mst_irq_state *s = (mst_irq_state *) opaque;
 186
 187         qemu_put_be32s(f, &s->prev_level);
 188         qemu_put_be32s(f, &s->leddat1);
 189         qemu_put_be32s(f, &s->leddat2);
 190         qemu_put_be32s(f, &s->ledctrl);
 191         qemu_put_be32s(f, &s->gpswr);
 192         qemu_put_be32s(f, &s->mscwr1);
 193         qemu_put_be32s(f, &s->mscwr2);
 194         qemu_put_be32s(f, &s->mscwr3);
 195         qemu_put_be32s(f, &s->mscrd);
 196         qemu_put_be32s(f, &s->intmskena);
 197         qemu_put_be32s(f, &s->intsetclr);
 198         qemu_put_be32s(f, &s->pcmcia0);
 199         qemu_put_be32s(f, &s->pcmcia1);
 200 }
 201
 202 static int
 203 mst_fpga_load(QEMUFile *f, void *opaque, int version_id)
 204 {
 205         mst_irq_state *s = (mst_irq_state *) opaque;
 206
 207         qemu_get_be32s(f, &s->prev_level);
 208         qemu_get_be32s(f, &s->leddat1);
 209         qemu_get_be32s(f, &s->leddat2);
 210         qemu_get_be32s(f, &s->ledctrl);
 211         qemu_get_be32s(f, &s->gpswr);
 212         qemu_get_be32s(f, &s->mscwr1);
 213         qemu_get_be32s(f, &s->mscwr2);
 214         qemu_get_be32s(f, &s->mscwr3);
 215         qemu_get_be32s(f, &s->mscrd);
 216         qemu_get_be32s(f, &s->intmskena);
 217         qemu_get_be32s(f, &s->intsetclr);
 218         qemu_get_be32s(f, &s->pcmcia0);
 219         qemu_get_be32s(f, &s->pcmcia1);
 220         return 0;
 221 }
 222
 223 qemu_irq *mst_irq_init(struct pxa2xx_state_s *cpu, uint32_t base, int irq)
 224 {
 225         mst_irq_state *s;
 226         int iomemtype;
 227         qemu_irq *qi;
 228
 229         s = (mst_irq_state  *)
 230                 qemu_mallocz(sizeof(mst_irq_state));
 231
 232         if (!s)
 233                 return NULL;
 234         s->target_base = base;
 235         s->parent = &cpu->pic[irq];
 236
 237         /* alloc the external 16 irqs */
 238         qi  = qemu_allocate_irqs(mst_fpga_set_irq, s, MST_NUM_IRQS);
 239         s->pins = qi;
 240
 241         iomemtype = cpu_register_io_memory(0, mst_fpga_readfn,
 242                 mst_fpga_writefn, s);
 243         cpu_register_physical_memory(MST_BASE, 0x00100000, iomemtype);
 244         register_savevm("mainstone_fpga", 0, 0, mst_fpga_save, mst_fpga_load, s);
 245         return qi;
 246 }