hw/char/omap_uart.c

   1 /*
   2  * TI OMAP processors UART emulation.
   3  *
   4  * Copyright (C) 2006-2008 Andrzej Zaborowski  <balrog@zabor.org>
   5  * Copyright (C) 2007-2009 Nokia Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 or
  10  * (at your option) version 3 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20 #include "qemu/osdep.h"
  21 #include "chardev/char.h"
  22 #include "hw/hw.h"
  23 #include "hw/arm/omap.h"
  24 #include "hw/char/serial.h"
  25 #include "exec/address-spaces.h"
  26
  27 /* UARTs */
  28 struct omap_uart_s {
  29     MemoryRegion iomem;
  30     hwaddr base;
  31     SerialState *serial; /* TODO */
  32     struct omap_target_agent_s *ta;
  33     omap_clk fclk;
  34     qemu_irq irq;
  35
  36     uint8_t eblr;
  37     uint8_t syscontrol;
  38     uint8_t wkup;
  39     uint8_t cfps;
  40     uint8_t mdr[2];
  41     uint8_t scr;
  42     uint8_t clksel;
  43 };
  44
  45 void omap_uart_reset(struct omap_uart_s *s)
  46 {
  47     s->eblr = 0x00;
  48     s->syscontrol = 0;
  49     s->wkup = 0x3f;
  50     s->cfps = 0x69;
  51     s->clksel = 0;
  52 }
  53
  54 struct omap_uart_s *omap_uart_init(hwaddr base,
  55                 qemu_irq irq, omap_clk fclk, omap_clk iclk,
  56                 qemu_irq txdma, qemu_irq rxdma,
  57                 const char *label, Chardev *chr)
  58 {
  59     struct omap_uart_s *s = g_new0(struct omap_uart_s, 1);
  60
  61     s->base = base;
  62     s->fclk = fclk;
  63     s->irq = irq;
  64     s->serial = serial_mm_init(get_system_memory(), base, 2, irq,
  65                                omap_clk_getrate(fclk)/16,
  66                                chr ?: qemu_chr_new(label, "null", NULL),
  67                                DEVICE_NATIVE_ENDIAN);
  68     return s;
  69 }
  70
  71 static uint64_t omap_uart_read(void *opaque, hwaddr addr,
  72                                unsigned size)
  73 {
  74     struct omap_uart_s *s = (struct omap_uart_s *) opaque;
  75
  76     if (size == 4) {
  77         return omap_badwidth_read8(opaque, addr);
  78     }
  79
  80     switch (addr) {
  81     case 0x20:  /* MDR1 */
  82         return s->mdr[0];
  83     case 0x24:  /* MDR2 */
  84         return s->mdr[1];
  85     case 0x40:  /* SCR */
  86         return s->scr;
  87     case 0x44:  /* SSR */
  88         return 0x0;
  89     case 0x48:  /* EBLR (OMAP2) */
  90         return s->eblr;
  91     case 0x4C:  /* OSC_12M_SEL (OMAP1) */
  92         return s->clksel;
  93     case 0x50:  /* MVR */
  94         return 0x30;
  95     case 0x54:  /* SYSC (OMAP2) */
  96         return s->syscontrol;
  97     case 0x58:  /* SYSS (OMAP2) */
  98         return 1;
  99     case 0x5c:  /* WER (OMAP2) */
 100         return s->wkup;
 101     case 0x60:  /* CFPS (OMAP2) */
 102         return s->cfps;
 103     }
 104
 105     OMAP_BAD_REG(addr);
 106     return 0;
 107 }
 108
 109 static void omap_uart_write(void *opaque, hwaddr addr,
 110                             uint64_t value, unsigned size)
 111 {
 112     struct omap_uart_s *s = (struct omap_uart_s *) opaque;
 113
 114     if (size == 4) {
 115         omap_badwidth_write8(opaque, addr, value);
 116         return;
 117     }
 118
 119     switch (addr) {
 120     case 0x20:  /* MDR1 */
 121         s->mdr[0] = value & 0x7f;
 122         break;
 123     case 0x24:  /* MDR2 */
 124         s->mdr[1] = value & 0xff;
 125         break;
 126     case 0x40:  /* SCR */
 127         s->scr = value & 0xff;
 128         break;
 129     case 0x48:  /* EBLR (OMAP2) */
 130         s->eblr = value & 0xff;
 131         break;
 132     case 0x4C:  /* OSC_12M_SEL (OMAP1) */
 133         s->clksel = value & 1;
 134         break;
 135     case 0x44:  /* SSR */
 136     case 0x50:  /* MVR */
 137     case 0x58:  /* SYSS (OMAP2) */
 138         OMAP_RO_REG(addr);
 139         break;
 140     case 0x54:  /* SYSC (OMAP2) */
 141         s->syscontrol = value & 0x1d;
 142         if (value & 2)
 143             omap_uart_reset(s);
 144         break;
 145     case 0x5c:  /* WER (OMAP2) */
 146         s->wkup = value & 0x7f;
 147         break;
 148     case 0x60:  /* CFPS (OMAP2) */
 149         s->cfps = value & 0xff;
 150         break;
 151     default:
 152         OMAP_BAD_REG(addr);
 153     }
 154 }
 155
 156 static const MemoryRegionOps omap_uart_ops = {
 157     .read = omap_uart_read,
 158     .write = omap_uart_write,
 159     .endianness = DEVICE_NATIVE_ENDIAN,
 160 };
 161
 162 struct omap_uart_s *omap2_uart_init(MemoryRegion *sysmem,
 163                 struct omap_target_agent_s *ta,
 164                 qemu_irq irq, omap_clk fclk, omap_clk iclk,
 165                 qemu_irq txdma, qemu_irq rxdma,
 166                 const char *label, Chardev *chr)
 167 {
 168     hwaddr base = omap_l4_attach(ta, 0, NULL);
 169     struct omap_uart_s *s = omap_uart_init(base, irq,
 170                     fclk, iclk, txdma, rxdma, label, chr);
 171
 172     memory_region_init_io(&s->iomem, NULL, &omap_uart_ops, s, "omap.uart", 0x100);
 173
 174     s->ta = ta;
 175
 176     memory_region_add_subregion(sysmem, base + 0x20, &s->iomem);
 177
 178     return s;
 179 }
 180
 181 void omap_uart_attach(struct omap_uart_s *s, Chardev *chr)
 182 {
 183     /* TODO: Should reuse or destroy current s->serial */
 184     s->serial = serial_mm_init(get_system_memory(), s->base, 2, s->irq,
 185                                omap_clk_getrate(s->fclk) / 16,
 186                                chr ?: qemu_chr_new("null", "null", NULL),
 187                                DEVICE_NATIVE_ENDIAN);
 188 }