2007-10-08 17:26:33 +04:00
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/*
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* QEMU ETRAX System Emulator
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*
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* Copyright (c) 2007 Edgar E. Iglesias, Axis Communications AB.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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2016-01-26 21:17:30 +03:00
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#include "qemu/osdep.h"
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2013-02-04 18:40:22 +04:00
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#include "hw/sysbus.h"
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2013-04-08 18:55:25 +04:00
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#include "sysemu/char.h"
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2012-12-17 21:20:00 +04:00
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#include "qemu/log.h"
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2007-10-08 17:26:33 +04:00
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2008-03-01 20:25:33 +03:00
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#define D(x)
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2009-05-05 15:13:18 +04:00
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#define RW_TR_CTRL (0x00 / 4)
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#define RW_TR_DMA_EN (0x04 / 4)
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#define RW_REC_CTRL (0x08 / 4)
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#define RW_DOUT (0x1c / 4)
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#define RS_STAT_DIN (0x20 / 4)
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#define R_STAT_DIN (0x24 / 4)
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#define RW_INTR_MASK (0x2c / 4)
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#define RW_ACK_INTR (0x30 / 4)
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#define R_INTR (0x34 / 4)
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#define R_MASKED_INTR (0x38 / 4)
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#define R_MAX (0x3c / 4)
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2007-10-08 17:26:33 +04:00
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2008-05-03 02:21:55 +04:00
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#define STAT_DAV 16
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#define STAT_TR_IDLE 22
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#define STAT_TR_RDY 24
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2013-07-24 23:52:26 +04:00
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#define TYPE_ETRAX_FS_SERIAL "etraxfs,serial"
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#define ETRAX_SERIAL(obj) \
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OBJECT_CHECK(ETRAXSerial, (obj), TYPE_ETRAX_FS_SERIAL)
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typedef struct ETRAXSerial {
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SysBusDevice parent_obj;
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2011-08-11 15:47:45 +04:00
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MemoryRegion mmio;
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2016-10-22 12:52:51 +03:00
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CharBackend chr;
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2009-05-16 03:44:24 +04:00
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qemu_irq irq;
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2008-05-03 02:21:55 +04:00
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2009-05-16 03:44:24 +04:00
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int pending_tx;
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2008-05-03 02:21:55 +04:00
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2010-06-14 20:41:12 +04:00
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uint8_t rx_fifo[16];
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unsigned int rx_fifo_pos;
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unsigned int rx_fifo_len;
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2009-05-16 03:44:24 +04:00
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/* Control registers. */
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uint32_t regs[R_MAX];
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2013-07-24 23:52:26 +04:00
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} ETRAXSerial;
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2008-05-03 02:21:55 +04:00
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2013-07-24 23:52:26 +04:00
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static void ser_update_irq(ETRAXSerial *s)
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2008-05-03 02:21:55 +04:00
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{
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2009-05-05 15:13:18 +04:00
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2010-06-14 20:41:12 +04:00
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if (s->rx_fifo_len) {
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s->regs[R_INTR] |= 8;
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} else {
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s->regs[R_INTR] &= ~8;
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}
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s->regs[R_MASKED_INTR] = s->regs[R_INTR] & s->regs[RW_INTR_MASK];
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2009-05-16 03:44:24 +04:00
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qemu_set_irq(s->irq, !!s->regs[R_MASKED_INTR]);
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2007-10-08 17:26:33 +04:00
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}
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2008-05-03 02:21:55 +04:00
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2011-08-11 15:47:45 +04:00
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static uint64_t
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2012-10-23 14:30:10 +04:00
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ser_read(void *opaque, hwaddr addr, unsigned int size)
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2007-10-08 17:26:33 +04:00
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{
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2013-07-24 23:52:26 +04:00
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ETRAXSerial *s = opaque;
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2009-05-16 03:44:24 +04:00
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uint32_t r = 0;
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addr >>= 2;
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switch (addr)
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{
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case R_STAT_DIN:
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2010-06-14 20:41:12 +04:00
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r = s->rx_fifo[(s->rx_fifo_pos - s->rx_fifo_len) & 15];
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if (s->rx_fifo_len) {
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r |= 1 << STAT_DAV;
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}
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r |= 1 << STAT_TR_RDY;
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r |= 1 << STAT_TR_IDLE;
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2009-05-16 03:44:24 +04:00
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break;
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case RS_STAT_DIN:
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2010-06-14 20:41:12 +04:00
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r = s->rx_fifo[(s->rx_fifo_pos - s->rx_fifo_len) & 15];
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if (s->rx_fifo_len) {
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r |= 1 << STAT_DAV;
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s->rx_fifo_len--;
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}
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r |= 1 << STAT_TR_RDY;
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r |= 1 << STAT_TR_IDLE;
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2009-05-16 03:44:24 +04:00
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break;
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default:
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r = s->regs[addr];
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2011-08-11 11:17:28 +04:00
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D(qemu_log("%s " TARGET_FMT_plx "=%x\n", __func__, addr, r));
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2009-05-16 03:44:24 +04:00
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break;
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}
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return r;
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2007-10-08 17:26:33 +04:00
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}
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static void
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2012-10-23 14:30:10 +04:00
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ser_write(void *opaque, hwaddr addr,
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2011-08-11 15:47:45 +04:00
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uint64_t val64, unsigned int size)
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2007-10-08 17:26:33 +04:00
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{
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2013-07-24 23:52:26 +04:00
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ETRAXSerial *s = opaque;
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2011-08-11 15:47:45 +04:00
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uint32_t value = val64;
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unsigned char ch = val64;
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2009-05-16 03:44:24 +04:00
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2011-08-11 11:17:28 +04:00
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D(qemu_log("%s " TARGET_FMT_plx "=%x\n", __func__, addr, value));
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2009-05-16 03:44:24 +04:00
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addr >>= 2;
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switch (addr)
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{
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case RW_DOUT:
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2016-09-06 16:56:04 +03:00
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/* XXX this blocks entire thread. Rewrite to use
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* qemu_chr_fe_write and background I/O callbacks */
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2016-10-22 12:52:55 +03:00
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qemu_chr_fe_write_all(&s->chr, &ch, 1);
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2010-06-14 20:41:12 +04:00
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s->regs[R_INTR] |= 3;
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2009-05-16 03:44:24 +04:00
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s->pending_tx = 1;
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s->regs[addr] = value;
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break;
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case RW_ACK_INTR:
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2010-06-14 20:41:12 +04:00
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if (s->pending_tx) {
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value &= ~1;
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2009-05-16 03:44:24 +04:00
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s->pending_tx = 0;
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2011-08-11 11:17:28 +04:00
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D(qemu_log("fixedup value=%x r_intr=%x\n",
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value, s->regs[R_INTR]));
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2009-05-16 03:44:24 +04:00
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}
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2010-06-14 20:41:12 +04:00
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s->regs[addr] = value;
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s->regs[R_INTR] &= ~value;
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D(printf("r_intr=%x\n", s->regs[R_INTR]));
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2009-05-16 03:44:24 +04:00
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break;
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default:
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s->regs[addr] = value;
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break;
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}
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ser_update_irq(s);
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2007-10-08 17:26:33 +04:00
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}
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2011-08-11 15:47:45 +04:00
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static const MemoryRegionOps ser_ops = {
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.read = ser_read,
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.write = ser_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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.valid = {
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.min_access_size = 4,
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.max_access_size = 4
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}
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2007-10-08 17:26:33 +04:00
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};
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2016-05-25 09:39:01 +03:00
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static Property etraxfs_ser_properties[] = {
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DEFINE_PROP_CHR("chardev", ETRAXSerial, chr),
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DEFINE_PROP_END_OF_LIST(),
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};
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2008-05-03 02:21:55 +04:00
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static void serial_receive(void *opaque, const uint8_t *buf, int size)
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2007-10-08 17:26:33 +04:00
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{
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2013-07-24 23:52:26 +04:00
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ETRAXSerial *s = opaque;
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2010-06-14 20:41:12 +04:00
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int i;
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/* Got a byte. */
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if (s->rx_fifo_len >= 16) {
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2015-11-13 15:24:26 +03:00
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D(qemu_log("WARNING: UART dropped char.\n"));
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2010-06-14 20:41:12 +04:00
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return;
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}
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for (i = 0; i < size; i++) {
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s->rx_fifo[s->rx_fifo_pos] = buf[i];
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s->rx_fifo_pos++;
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s->rx_fifo_pos &= 15;
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s->rx_fifo_len++;
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}
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2008-05-03 02:21:55 +04:00
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2009-05-16 03:44:24 +04:00
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ser_update_irq(s);
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2008-05-03 02:21:55 +04:00
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}
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static int serial_can_receive(void *opaque)
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{
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2013-07-24 23:52:26 +04:00
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ETRAXSerial *s = opaque;
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2008-05-03 02:21:55 +04:00
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2009-05-16 03:44:24 +04:00
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/* Is the receiver enabled? */
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2010-06-14 20:41:12 +04:00
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if (!(s->regs[RW_REC_CTRL] & (1 << 3))) {
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return 0;
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}
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2008-05-03 02:21:55 +04:00
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2015-09-25 17:36:02 +03:00
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return sizeof(s->rx_fifo) - s->rx_fifo_len;
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2008-05-03 02:21:55 +04:00
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}
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static void serial_event(void *opaque, int event)
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{
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}
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2011-06-30 12:52:22 +04:00
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static void etraxfs_ser_reset(DeviceState *d)
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2008-05-03 02:21:55 +04:00
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{
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2013-07-24 23:52:26 +04:00
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ETRAXSerial *s = ETRAX_SERIAL(d);
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2009-05-16 03:44:24 +04:00
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/* transmitter begins ready and idle. */
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s->regs[RS_STAT_DIN] |= (1 << STAT_TR_RDY);
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s->regs[RS_STAT_DIN] |= (1 << STAT_TR_IDLE);
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2011-06-30 12:52:22 +04:00
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s->regs[RW_REC_CTRL] = 0x10000;
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}
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2016-05-25 09:39:01 +03:00
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static void etraxfs_ser_init(Object *obj)
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2011-06-30 12:52:22 +04:00
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{
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2016-05-25 09:39:01 +03:00
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ETRAXSerial *s = ETRAX_SERIAL(obj);
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SysBusDevice *dev = SYS_BUS_DEVICE(obj);
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2011-06-30 12:52:22 +04:00
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2009-05-16 03:44:24 +04:00
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sysbus_init_irq(dev, &s->irq);
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2016-05-25 09:39:01 +03:00
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memory_region_init_io(&s->mmio, obj, &ser_ops, s,
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2013-06-07 05:25:08 +04:00
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"etraxfs-serial", R_MAX * 4);
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2011-11-27 13:38:10 +04:00
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sysbus_init_mmio(dev, &s->mmio);
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2016-05-25 09:39:01 +03:00
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}
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static void etraxfs_ser_realize(DeviceState *dev, Error **errp)
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{
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ETRAXSerial *s = ETRAX_SERIAL(dev);
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2011-08-11 15:47:45 +04:00
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2016-10-22 12:52:59 +03:00
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qemu_chr_fe_set_handlers(&s->chr,
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serial_can_receive, serial_receive,
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2016-10-22 12:53:03 +03:00
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serial_event, s, NULL, true);
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2007-10-08 17:26:33 +04:00
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}
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2009-05-16 03:40:46 +04:00
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2012-01-24 23:12:29 +04:00
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static void etraxfs_ser_class_init(ObjectClass *klass, void *data)
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{
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2011-12-08 07:34:16 +04:00
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DeviceClass *dc = DEVICE_CLASS(klass);
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2012-01-24 23:12:29 +04:00
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2011-12-08 07:34:16 +04:00
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dc->reset = etraxfs_ser_reset;
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2016-05-25 09:39:01 +03:00
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dc->props = etraxfs_ser_properties;
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dc->realize = etraxfs_ser_realize;
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2012-01-24 23:12:29 +04:00
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}
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2013-01-10 19:19:07 +04:00
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static const TypeInfo etraxfs_ser_info = {
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2013-07-24 23:52:26 +04:00
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.name = TYPE_ETRAX_FS_SERIAL,
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2011-12-08 07:34:16 +04:00
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.parent = TYPE_SYS_BUS_DEVICE,
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2013-07-24 23:52:26 +04:00
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.instance_size = sizeof(ETRAXSerial),
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2016-05-25 09:39:01 +03:00
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.instance_init = etraxfs_ser_init,
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2011-12-08 07:34:16 +04:00
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.class_init = etraxfs_ser_class_init,
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2011-06-30 12:52:22 +04:00
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};
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2012-02-09 18:20:55 +04:00
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static void etraxfs_serial_register_types(void)
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2009-05-16 03:40:46 +04:00
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{
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2011-12-08 07:34:16 +04:00
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type_register_static(&etraxfs_ser_info);
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2009-05-16 03:40:46 +04:00
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}
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2012-02-09 18:20:55 +04:00
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type_init(etraxfs_serial_register_types)
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