hw/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-char.h"
  21 #include "hw.h"
  22 #include "omap.h"
  23 /* We use pc-style serial ports.  */
  24 #include "pc.h"
  25
  26 /* UARTs */
  27 struct omap_uart_s {
  28     target_phys_addr_t base;
  29     SerialState *serial; /* TODO */
  30     struct omap_target_agent_s *ta;
  31     omap_clk fclk;
  32     qemu_irq irq;
  33
  34     uint8_t eblr;
  35     uint8_t syscontrol;
  36     uint8_t wkup;
  37     uint8_t cfps;
  38     uint8_t mdr[2];
  39     uint8_t scr;
  40     uint8_t clksel;
  41 };
  42
  43 void omap_uart_reset(struct omap_uart_s *s)
  44 {
  45     s->eblr = 0x00;
  46     s->syscontrol = 0;
  47     s->wkup = 0x3f;
  48     s->cfps = 0x69;
  49     s->clksel = 0;
  50 }
  51
  52 struct omap_uart_s *omap_uart_init(target_phys_addr_t base,
  53                 qemu_irq irq, omap_clk fclk, omap_clk iclk,
  54                 qemu_irq txdma, qemu_irq rxdma,
  55                 const char *label, CharDriverState *chr)
  56 {
  57     struct omap_uart_s *s = (struct omap_uart_s *)
  58             qemu_mallocz(sizeof(struct omap_uart_s));
  59
  60     s->base = base;
  61     s->fclk = fclk;
  62     s->irq = irq;
  63 #ifdef TARGET_WORDS_BIGENDIAN
  64     s->serial = serial_mm_init(base, 2, irq, omap_clk_getrate(fclk)/16,
  65                                chr ?: qemu_chr_open(label, "null", NULL), 1,
  66                                1);
  67 #else
  68     s->serial = serial_mm_init(base, 2, irq, omap_clk_getrate(fclk)/16,
  69                                chr ?: qemu_chr_open(label, "null", NULL), 1,
  70                                0);
  71 #endif
  72     return s;
  73 }
  74
  75 static uint32_t omap_uart_read(void *opaque, target_phys_addr_t addr)
  76 {
  77     struct omap_uart_s *s = (struct omap_uart_s *) opaque;
  78
  79     addr &= 0xff;
  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, target_phys_addr_t addr,
 110                 uint32_t value)
 111 {
 112     struct omap_uart_s *s = (struct omap_uart_s *) opaque;
 113
 114     addr &= 0xff;
 115     switch (addr) {
 116     case 0x20:  /* MDR1 */
 117         s->mdr[0] = value & 0x7f;
 118         break;
 119     case 0x24:  /* MDR2 */
 120         s->mdr[1] = value & 0xff;
 121         break;
 122     case 0x40:  /* SCR */
 123         s->scr = value & 0xff;
 124         break;
 125     case 0x48:  /* EBLR (OMAP2) */
 126         s->eblr = value & 0xff;
 127         break;
 128     case 0x4C:  /* OSC_12M_SEL (OMAP1) */
 129         s->clksel = value & 1;
 130         break;
 131     case 0x44:  /* SSR */
 132     case 0x50:  /* MVR */
 133     case 0x58:  /* SYSS (OMAP2) */
 134         OMAP_RO_REG(addr);
 135         break;
 136     case 0x54:  /* SYSC (OMAP2) */
 137         s->syscontrol = value & 0x1d;
 138         if (value & 2)
 139             omap_uart_reset(s);
 140         break;
 141     case 0x5c:  /* WER (OMAP2) */
 142         s->wkup = value & 0x7f;
 143         break;
 144     case 0x60:  /* CFPS (OMAP2) */
 145         s->cfps = value & 0xff;
 146         break;
 147     default:
 148         OMAP_BAD_REG(addr);
 149     }
 150 }
 151
 152 static CPUReadMemoryFunc * const omap_uart_readfn[] = {
 153     omap_uart_read,
 154     omap_uart_read,
 155     omap_badwidth_read8,
 156 };
 157
 158 static CPUWriteMemoryFunc * const omap_uart_writefn[] = {
 159     omap_uart_write,
 160     omap_uart_write,
 161     omap_badwidth_write8,
 162 };
 163
 164 struct omap_uart_s *omap2_uart_init(struct omap_target_agent_s *ta,
 165                 qemu_irq irq, omap_clk fclk, omap_clk iclk,
 166                 qemu_irq txdma, qemu_irq rxdma,
 167                 const char *label, CharDriverState *chr)
 168 {
 169     target_phys_addr_t base = omap_l4_attach(ta, 0, 0);
 170     struct omap_uart_s *s = omap_uart_init(base, irq,
 171                     fclk, iclk, txdma, rxdma, label, chr);
 172     int iomemtype = cpu_register_io_memory(omap_uart_readfn,
 173                     omap_uart_writefn, s);
 174
 175     s->ta = ta;
 176
 177     cpu_register_physical_memory(base + 0x20, 0x100, iomemtype);
 178
 179     return s;
 180 }
 181
 182 void omap_uart_attach(struct omap_uart_s *s, CharDriverState *chr)
 183 {
 184     /* TODO: Should reuse or destroy current s->serial */
 185 #ifdef TARGET_WORDS_BIGENDIAN
 186     s->serial = serial_mm_init(s->base, 2, s->irq,
 187                                omap_clk_getrate(s->fclk) / 16,
 188                                chr ?: qemu_chr_open("null", "null", NULL), 1,
 189                                1);
 190 #else
 191     s->serial = serial_mm_init(s->base, 2, s->irq,
 192                                omap_clk_getrate(s->fclk) / 16,
 193                                chr ?: qemu_chr_open("null", "null", NULL), 1,
 194                                0);
 195 #endif
 196 }