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/*
* TI OMAP processors UART emulation.
*
* Copyright (C) 2006-2008 Andrzej Zaborowski <balrog@zabor.org>
* Copyright (C) 2007-2009 Nokia Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 or
* (at your option) version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "chardev/char.h"
#include "hw/hw.h"
#include "hw/arm/omap.h"
#include "hw/char/serial.h"
#include "exec/address-spaces.h"
/* UARTs */
struct omap_uart_s {
MemoryRegion iomem;
hwaddr base;
SerialState *serial; /* TODO */
struct omap_target_agent_s *ta;
omap_clk fclk;
qemu_irq irq;
uint8_t eblr;
uint8_t syscontrol;
uint8_t wkup;
uint8_t cfps;
uint8_t mdr[2];
uint8_t scr;
uint8_t clksel;
};
void omap_uart_reset(struct omap_uart_s *s)
{
s->eblr = 0x00;
s->syscontrol = 0;
s->wkup = 0x3f;
s->cfps = 0x69;
s->clksel = 0;
}
struct omap_uart_s *omap_uart_init(hwaddr base,
qemu_irq irq, omap_clk fclk, omap_clk iclk,
qemu_irq txdma, qemu_irq rxdma,
const char *label, Chardev *chr)
{
struct omap_uart_s *s = g_new0(struct omap_uart_s, 1);
s->base = base;
s->fclk = fclk;
s->irq = irq;
s->serial = serial_mm_init(get_system_memory(), base, 2, irq,
omap_clk_getrate(fclk)/16,
chr ?: qemu_chr_new(label, "null"),
DEVICE_NATIVE_ENDIAN);
return s;
}
static uint64_t omap_uart_read(void *opaque, hwaddr addr,
unsigned size)
{
struct omap_uart_s *s = (struct omap_uart_s *) opaque;
if (size == 4) {
return omap_badwidth_read8(opaque, addr);
}
switch (addr) {
case 0x20: /* MDR1 */
return s->mdr[0];
case 0x24: /* MDR2 */
return s->mdr[1];
case 0x40: /* SCR */
return s->scr;
case 0x44: /* SSR */
return 0x0;
case 0x48: /* EBLR (OMAP2) */
return s->eblr;
case 0x4C: /* OSC_12M_SEL (OMAP1) */
return s->clksel;
case 0x50: /* MVR */
return 0x30;
case 0x54: /* SYSC (OMAP2) */
return s->syscontrol;
case 0x58: /* SYSS (OMAP2) */
return 1;
case 0x5c: /* WER (OMAP2) */
return s->wkup;
case 0x60: /* CFPS (OMAP2) */
return s->cfps;
}
OMAP_BAD_REG(addr);
return 0;
}
static void omap_uart_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
struct omap_uart_s *s = (struct omap_uart_s *) opaque;
if (size == 4) {
omap_badwidth_write8(opaque, addr, value);
return;
}
switch (addr) {
case 0x20: /* MDR1 */
s->mdr[0] = value & 0x7f;
break;
case 0x24: /* MDR2 */
s->mdr[1] = value & 0xff;
break;
case 0x40: /* SCR */
s->scr = value & 0xff;
break;
case 0x48: /* EBLR (OMAP2) */
s->eblr = value & 0xff;
break;
case 0x4C: /* OSC_12M_SEL (OMAP1) */
s->clksel = value & 1;
break;
case 0x44: /* SSR */
case 0x50: /* MVR */
case 0x58: /* SYSS (OMAP2) */
OMAP_RO_REG(addr);
break;
case 0x54: /* SYSC (OMAP2) */
s->syscontrol = value & 0x1d;
if (value & 2)
omap_uart_reset(s);
break;
case 0x5c: /* WER (OMAP2) */
s->wkup = value & 0x7f;
break;
case 0x60: /* CFPS (OMAP2) */
s->cfps = value & 0xff;
break;
default:
OMAP_BAD_REG(addr);
}
}
static const MemoryRegionOps omap_uart_ops = {
.read = omap_uart_read,
.write = omap_uart_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
struct omap_uart_s *omap2_uart_init(MemoryRegion *sysmem,
struct omap_target_agent_s *ta,
qemu_irq irq, omap_clk fclk, omap_clk iclk,
qemu_irq txdma, qemu_irq rxdma,
const char *label, Chardev *chr)
{
hwaddr base = omap_l4_attach(ta, 0, NULL);
struct omap_uart_s *s = omap_uart_init(base, irq,
fclk, iclk, txdma, rxdma, label, chr);
memory_region_init_io(&s->iomem, NULL, &omap_uart_ops, s, "omap.uart", 0x100);
s->ta = ta;
memory_region_add_subregion(sysmem, base + 0x20, &s->iomem);
return s;
}
void omap_uart_attach(struct omap_uart_s *s, Chardev *chr)
{
/* TODO: Should reuse or destroy current s->serial */
s->serial = serial_mm_init(get_system_memory(), s->base, 2, s->irq,
omap_clk_getrate(s->fclk) / 16,
chr ?: qemu_chr_new("null", "null"),
DEVICE_NATIVE_ENDIAN);
}
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