2 * QEMU SCI/SCIF serial port emulation
4 * Copyright (c) 2007 Magnus Damm
6 * Based on serial.c - QEMU 16450 UART emulation
7 * Copyright (c) 2003-2004 Fabrice Bellard
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 //#define DEBUG_SERIAL
32 #define SH_SERIAL_FLAG_TEND (1 << 0)
33 #define SH_SERIAL_FLAG_TDE (1 << 1)
34 #define SH_SERIAL_FLAG_RDF (1 << 2)
35 #define SH_SERIAL_FLAG_BRK (1 << 3)
36 #define SH_SERIAL_FLAG_DR (1 << 4)
42 uint8_t dr; /* ftdr / tdr */
43 uint8_t sr; /* fsr / ssr */
47 uint8_t rx_fifo[16]; /* frdr / rdr */
50 target_phys_addr_t base;
58 static void sh_serial_ioport_write(void *opaque, uint32_t offs, uint32_t val)
60 sh_serial_state *s = opaque;
64 printf("sh_serial: write base=0x%08lx offs=0x%02x val=0x%02x\n",
65 (unsigned long) s->base, offs, val);
69 s->smr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0x7b : 0xff);
75 s->scr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0xfb : 0xff);
76 if (!(val & (1 << 5)))
77 s->flags |= SH_SERIAL_FLAG_TEND;
79 case 0x0c: /* FTDR / TDR */
82 qemu_chr_write(s->chr, &ch, 1);
85 s->flags &= ~SH_SERIAL_FLAG_TDE;
88 case 0x14: /* FRDR / RDR */
93 if (s->feat & SH_SERIAL_FEAT_SCIF) {
96 if (!(val & (1 << 6)))
97 s->flags &= ~SH_SERIAL_FLAG_TEND;
98 if (!(val & (1 << 5)))
99 s->flags &= ~SH_SERIAL_FLAG_TDE;
100 if (!(val & (1 << 4)))
101 s->flags &= ~SH_SERIAL_FLAG_BRK;
102 if (!(val & (1 << 1)))
103 s->flags &= ~SH_SERIAL_FLAG_RDF;
104 if (!(val & (1 << 0)))
105 s->flags &= ~SH_SERIAL_FLAG_DR;
110 case 0x20: /* SPTR */
133 fprintf(stderr, "sh_serial: unsupported write to 0x%02x\n", offs);
137 static uint32_t sh_serial_ioport_read(void *opaque, uint32_t offs)
139 sh_serial_state *s = opaque;
158 if (s->feat & SH_SERIAL_FEAT_SCIF) {
162 if (s->flags & SH_SERIAL_FLAG_TEND)
164 if (s->flags & SH_SERIAL_FLAG_TDE)
166 if (s->flags & SH_SERIAL_FLAG_BRK)
168 if (s->flags & SH_SERIAL_FLAG_RDF)
170 if (s->flags & SH_SERIAL_FLAG_DR)
173 if (s->scr & (1 << 5))
174 s->flags |= SH_SERIAL_FLAG_TDE | SH_SERIAL_FLAG_TEND;
209 printf("sh_serial: read base=0x%08lx offs=0x%02x val=0x%x\n",
210 (unsigned long) s->base, offs, ret);
213 if (ret & ~((1 << 16) - 1)) {
214 fprintf(stderr, "sh_serial: unsupported read from 0x%02x\n", offs);
221 static int sh_serial_can_receive(sh_serial_state *s)
226 static void sh_serial_receive_byte(sh_serial_state *s, int ch)
230 static void sh_serial_receive_break(sh_serial_state *s)
234 static int sh_serial_can_receive1(void *opaque)
236 sh_serial_state *s = opaque;
237 return sh_serial_can_receive(s);
240 static void sh_serial_receive1(void *opaque, const uint8_t *buf, int size)
242 sh_serial_state *s = opaque;
243 sh_serial_receive_byte(s, buf[0]);
246 static void sh_serial_event(void *opaque, int event)
248 sh_serial_state *s = opaque;
249 if (event == CHR_EVENT_BREAK)
250 sh_serial_receive_break(s);
253 uint32_t sh_serial_read (void *opaque, target_phys_addr_t addr)
255 sh_serial_state *s = opaque;
256 return sh_serial_ioport_read(s, addr - s->base);
259 void sh_serial_write (void *opaque,
260 target_phys_addr_t addr, uint32_t value)
262 sh_serial_state *s = opaque;
263 sh_serial_ioport_write(s, addr - s->base, value);
266 static CPUReadMemoryFunc *sh_serial_readfn[] = {
272 static CPUWriteMemoryFunc *sh_serial_writefn[] = {
278 void sh_serial_init (target_phys_addr_t base, int feat,
279 uint32_t freq, CharDriverState *chr)
284 s = qemu_mallocz(sizeof(sh_serial_state));
290 s->flags = SH_SERIAL_FLAG_TEND | SH_SERIAL_FLAG_TDE;
297 if (feat & SH_SERIAL_FEAT_SCIF) {
306 s_io_memory = cpu_register_io_memory(0, sh_serial_readfn,
307 sh_serial_writefn, s);
308 cpu_register_physical_memory(base, 0x28, s_io_memory);
313 qemu_chr_add_handlers(chr, sh_serial_can_receive1, sh_serial_receive1,