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omap_spi.c
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/*
* TI OMAP processor's Multichannel SPI emulation.
*
* Copyright (C) 2007-2009 Nokia Corporation
*
* Original code for OMAP2 by Andrzej Zaborowski <[email protected]>
*
* 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) any later version 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "hw.h"
#include "omap.h"
/* Multichannel SPI */
struct omap_mcspi_s {
MemoryRegion iomem;
qemu_irq irq;
int chnum;
uint32_t sysconfig;
uint32_t systest;
uint32_t irqst;
uint32_t irqen;
uint32_t wken;
uint32_t control;
struct omap_mcspi_ch_s {
qemu_irq txdrq;
qemu_irq rxdrq;
uint32_t (*txrx)(void *opaque, uint32_t, int);
void *opaque;
uint32_t tx;
uint32_t rx;
uint32_t config;
uint32_t status;
uint32_t control;
} ch[4];
};
static inline void omap_mcspi_interrupt_update(struct omap_mcspi_s *s)
{
qemu_set_irq(s->irq, s->irqst & s->irqen);
}
static inline void omap_mcspi_dmarequest_update(struct omap_mcspi_ch_s *ch)
{
qemu_set_irq(ch->txdrq,
(ch->control & 1) && /* EN */
(ch->config & (1 << 14)) && /* DMAW */
(ch->status & (1 << 1)) && /* TXS */
((ch->config >> 12) & 3) != 1); /* TRM */
qemu_set_irq(ch->rxdrq,
(ch->control & 1) && /* EN */
(ch->config & (1 << 15)) && /* DMAW */
(ch->status & (1 << 0)) && /* RXS */
((ch->config >> 12) & 3) != 2); /* TRM */
}
static void omap_mcspi_transfer_run(struct omap_mcspi_s *s, int chnum)
{
struct omap_mcspi_ch_s *ch = s->ch + chnum;
if (!(ch->control & 1)) /* EN */
return;
if ((ch->status & (1 << 0)) && /* RXS */
((ch->config >> 12) & 3) != 2 && /* TRM */
!(ch->config & (1 << 19))) /* TURBO */
goto intr_update;
if ((ch->status & (1 << 1)) && /* TXS */
((ch->config >> 12) & 3) != 1) /* TRM */
goto intr_update;
if (!(s->control & 1) || /* SINGLE */
(ch->config & (1 << 20))) { /* FORCE */
if (ch->txrx)
ch->rx = ch->txrx(ch->opaque, ch->tx, /* WL */
1 + (0x1f & (ch->config >> 7)));
}
ch->tx = 0;
ch->status |= 1 << 2; /* EOT */
ch->status |= 1 << 1; /* TXS */
if (((ch->config >> 12) & 3) != 2) /* TRM */
ch->status |= 1 << 0; /* RXS */
intr_update:
if ((ch->status & (1 << 0)) && /* RXS */
((ch->config >> 12) & 3) != 2 && /* TRM */
!(ch->config & (1 << 19))) /* TURBO */
s->irqst |= 1 << (2 + 4 * chnum); /* RX_FULL */
if ((ch->status & (1 << 1)) && /* TXS */
((ch->config >> 12) & 3) != 1) /* TRM */
s->irqst |= 1 << (0 + 4 * chnum); /* TX_EMPTY */
omap_mcspi_interrupt_update(s);
omap_mcspi_dmarequest_update(ch);
}
void omap_mcspi_reset(struct omap_mcspi_s *s)
{
int ch;
s->sysconfig = 0;
s->systest = 0;
s->irqst = 0;
s->irqen = 0;
s->wken = 0;
s->control = 4;
for (ch = 0; ch < 4; ch ++) {
s->ch[ch].config = 0x060000;
s->ch[ch].status = 2; /* TXS */
s->ch[ch].control = 0;
omap_mcspi_dmarequest_update(s->ch + ch);
}
omap_mcspi_interrupt_update(s);
}
static uint64_t omap_mcspi_read(void *opaque, hwaddr addr,
unsigned size)
{
struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque;
int ch = 0;
uint32_t ret;
if (size != 4) {
return omap_badwidth_read32(opaque, addr);
}
switch (addr) {
case 0x00: /* MCSPI_REVISION */
return 0x91;
case 0x10: /* MCSPI_SYSCONFIG */
return s->sysconfig;
case 0x14: /* MCSPI_SYSSTATUS */
return 1; /* RESETDONE */
case 0x18: /* MCSPI_IRQSTATUS */
return s->irqst;
case 0x1c: /* MCSPI_IRQENABLE */
return s->irqen;
case 0x20: /* MCSPI_WAKEUPENABLE */
return s->wken;
case 0x24: /* MCSPI_SYST */
return s->systest;
case 0x28: /* MCSPI_MODULCTRL */
return s->control;
case 0x68: ch ++;
case 0x54: ch ++;
case 0x40: ch ++;
case 0x2c: /* MCSPI_CHCONF */
return s->ch[ch].config;
case 0x6c: ch ++;
case 0x58: ch ++;
case 0x44: ch ++;
case 0x30: /* MCSPI_CHSTAT */
return s->ch[ch].status;
case 0x70: ch ++;
case 0x5c: ch ++;
case 0x48: ch ++;
case 0x34: /* MCSPI_CHCTRL */
return s->ch[ch].control;
case 0x74: ch ++;
case 0x60: ch ++;
case 0x4c: ch ++;
case 0x38: /* MCSPI_TX */
return s->ch[ch].tx;
case 0x78: ch ++;
case 0x64: ch ++;
case 0x50: ch ++;
case 0x3c: /* MCSPI_RX */
s->ch[ch].status &= ~(1 << 0); /* RXS */
ret = s->ch[ch].rx;
omap_mcspi_transfer_run(s, ch);
return ret;
}
OMAP_BAD_REG(addr);
return 0;
}
static void omap_mcspi_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque;
int ch = 0;
if (size != 4) {
return omap_badwidth_write32(opaque, addr, value);
}
switch (addr) {
case 0x00: /* MCSPI_REVISION */
case 0x14: /* MCSPI_SYSSTATUS */
case 0x30: /* MCSPI_CHSTAT0 */
case 0x3c: /* MCSPI_RX0 */
case 0x44: /* MCSPI_CHSTAT1 */
case 0x50: /* MCSPI_RX1 */
case 0x58: /* MCSPI_CHSTAT2 */
case 0x64: /* MCSPI_RX2 */
case 0x6c: /* MCSPI_CHSTAT3 */
case 0x78: /* MCSPI_RX3 */
OMAP_RO_REG(addr);
return;
case 0x10: /* MCSPI_SYSCONFIG */
if (value & (1 << 1)) /* SOFTRESET */
omap_mcspi_reset(s);
s->sysconfig = value & 0x31d;
break;
case 0x18: /* MCSPI_IRQSTATUS */
if (!((s->control & (1 << 3)) && (s->systest & (1 << 11)))) {
s->irqst &= ~value;
omap_mcspi_interrupt_update(s);
}
break;
case 0x1c: /* MCSPI_IRQENABLE */
s->irqen = value & 0x1777f;
omap_mcspi_interrupt_update(s);
break;
case 0x20: /* MCSPI_WAKEUPENABLE */
s->wken = value & 1;
break;
case 0x24: /* MCSPI_SYST */
if (s->control & (1 << 3)) /* SYSTEM_TEST */
if (value & (1 << 11)) { /* SSB */
s->irqst |= 0x1777f;
omap_mcspi_interrupt_update(s);
}
s->systest = value & 0xfff;
break;
case 0x28: /* MCSPI_MODULCTRL */
if (value & (1 << 3)) /* SYSTEM_TEST */
if (s->systest & (1 << 11)) { /* SSB */
s->irqst |= 0x1777f;
omap_mcspi_interrupt_update(s);
}
s->control = value & 0xf;
break;
case 0x68: ch ++;
case 0x54: ch ++;
case 0x40: ch ++;
case 0x2c: /* MCSPI_CHCONF */
if ((value ^ s->ch[ch].config) & (3 << 14)) /* DMAR | DMAW */
omap_mcspi_dmarequest_update(s->ch + ch);
if (((value >> 12) & 3) == 3) /* TRM */
fprintf(stderr, "%s: invalid TRM value (3)\n", __FUNCTION__);
if (((value >> 7) & 0x1f) < 3) /* WL */
fprintf(stderr, "%s: invalid WL value (%" PRIx64 ")\n",
__FUNCTION__, (value >> 7) & 0x1f);
s->ch[ch].config = value & 0x7fffff;
break;
case 0x70: ch ++;
case 0x5c: ch ++;
case 0x48: ch ++;
case 0x34: /* MCSPI_CHCTRL */
if (value & ~s->ch[ch].control & 1) { /* EN */
s->ch[ch].control |= 1;
omap_mcspi_transfer_run(s, ch);
} else
s->ch[ch].control = value & 1;
break;
case 0x74: ch ++;
case 0x60: ch ++;
case 0x4c: ch ++;
case 0x38: /* MCSPI_TX */
s->ch[ch].tx = value;
s->ch[ch].status &= ~(1 << 1); /* TXS */
omap_mcspi_transfer_run(s, ch);
break;
default:
OMAP_BAD_REG(addr);
return;
}
}
static const MemoryRegionOps omap_mcspi_ops = {
.read = omap_mcspi_read,
.write = omap_mcspi_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
struct omap_mcspi_s *omap_mcspi_init(struct omap_target_agent_s *ta, int chnum,
qemu_irq irq, qemu_irq *drq, omap_clk fclk, omap_clk iclk)
{
struct omap_mcspi_s *s = (struct omap_mcspi_s *)
g_malloc0(sizeof(struct omap_mcspi_s));
struct omap_mcspi_ch_s *ch = s->ch;
s->irq = irq;
s->chnum = chnum;
while (chnum --) {
ch->txdrq = *drq ++;
ch->rxdrq = *drq ++;
ch ++;
}
omap_mcspi_reset(s);
memory_region_init_io(&s->iomem, &omap_mcspi_ops, s, "omap.mcspi",
omap_l4_region_size(ta, 0));
omap_l4_attach(ta, 0, &s->iomem);
return s;
}
void omap_mcspi_attach(struct omap_mcspi_s *s,
uint32_t (*txrx)(void *opaque, uint32_t, int), void *opaque,
int chipselect)
{
if (chipselect < 0 || chipselect >= s->chnum)
hw_error("%s: Bad chipselect %i\n", __FUNCTION__, chipselect);
s->ch[chipselect].txrx = txrx;
s->ch[chipselect].opaque = opaque;
}