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qemu/hw/xilinx_spips.c

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/*
* QEMU model of the Xilinx Zynq SPI controller
*
* Copyright (c) 2012 Peter A. G. Crosthwaite
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysbus.h"
#include "sysemu.h"
#include "ptimer.h"
#include "qemu-log.h"
#include "fifo.h"
#include "ssi.h"
#ifdef XILINX_SPIPS_ERR_DEBUG
#define DB_PRINT(...) do { \
fprintf(stderr, ": %s: ", __func__); \
fprintf(stderr, ## __VA_ARGS__); \
} while (0);
#else
#define DB_PRINT(...)
#endif
/* config register */
#define R_CONFIG (0x00 / 4)
#define MODEFAIL_GEN_EN (1 << 17)
#define MAN_START_COM (1 << 16)
#define MAN_START_EN (1 << 15)
#define MANUAL_CS (1 << 14)
#define CS (0xF << 10)
#define CS_SHIFT (10)
#define PERI_SEL (1 << 9)
#define REF_CLK (1 << 8)
#define FIFO_WIDTH (3 << 6)
#define BAUD_RATE_DIV (7 << 3)
#define CLK_PH (1 << 2)
#define CLK_POL (1 << 1)
#define MODE_SEL (1 << 0)
/* interrupt mechanism */
#define R_INTR_STATUS (0x04 / 4)
#define R_INTR_EN (0x08 / 4)
#define R_INTR_DIS (0x0C / 4)
#define R_INTR_MASK (0x10 / 4)
#define IXR_TX_FIFO_UNDERFLOW (1 << 6)
#define IXR_RX_FIFO_FULL (1 << 5)
#define IXR_RX_FIFO_NOT_EMPTY (1 << 4)
#define IXR_TX_FIFO_FULL (1 << 3)
#define IXR_TX_FIFO_NOT_FULL (1 << 2)
#define IXR_TX_FIFO_MODE_FAIL (1 << 1)
#define IXR_RX_FIFO_OVERFLOW (1 << 0)
#define IXR_ALL ((IXR_TX_FIFO_UNDERFLOW<<1)-1)
#define R_EN (0x14 / 4)
#define R_DELAY (0x18 / 4)
#define R_TX_DATA (0x1C / 4)
#define R_RX_DATA (0x20 / 4)
#define R_SLAVE_IDLE_COUNT (0x24 / 4)
#define R_TX_THRES (0x28 / 4)
#define R_RX_THRES (0x2C / 4)
#define R_MOD_ID (0xFC / 4)
#define R_MAX (R_MOD_ID+1)
/* size of TXRX FIFOs */
#define NUM_CS_LINES 4
#define RXFF_A 32
#define TXFF_A 32
typedef struct {
SysBusDevice busdev;
MemoryRegion iomem;
qemu_irq irq;
int irqline;
qemu_irq cs_lines[NUM_CS_LINES];
SSIBus *spi;
Fifo8 rx_fifo;
Fifo8 tx_fifo;
uint32_t regs[R_MAX];
} XilinxSPIPS;
static void xilinx_spips_update_cs_lines(XilinxSPIPS *s)
{
int i;
bool found = false;
int field = s->regs[R_CONFIG] >> CS_SHIFT;
for (i = 0; i < NUM_CS_LINES; i++) {
if (~field & (1 << i) && !found) {
found = true;
DB_PRINT("selecting slave %d\n", i);
qemu_set_irq(s->cs_lines[i], 0);
} else {
qemu_set_irq(s->cs_lines[i], 1);
}
}
}
static void xilinx_spips_update_ixr(XilinxSPIPS *s)
{
/* These are set/cleared as they occur */
s->regs[R_INTR_STATUS] &= (IXR_TX_FIFO_UNDERFLOW | IXR_RX_FIFO_OVERFLOW |
IXR_TX_FIFO_MODE_FAIL);
/* these are pure functions of fifo state, set them here */
s->regs[R_INTR_STATUS] |=
(fifo8_is_full(&s->rx_fifo) ? IXR_RX_FIFO_FULL : 0) |
(s->rx_fifo.num >= s->regs[R_RX_THRES] ? IXR_RX_FIFO_NOT_EMPTY : 0) |
(fifo8_is_full(&s->tx_fifo) ? IXR_TX_FIFO_FULL : 0) |
(s->tx_fifo.num < s->regs[R_TX_THRES] ? IXR_TX_FIFO_NOT_FULL : 0);
/* drive external interrupt pin */
int new_irqline = !!(s->regs[R_INTR_MASK] & s->regs[R_INTR_STATUS] &
IXR_ALL);
if (new_irqline != s->irqline) {
s->irqline = new_irqline;
qemu_set_irq(s->irq, s->irqline);
}
}
static void xilinx_spips_reset(DeviceState *d)
{
XilinxSPIPS *s = DO_UPCAST(XilinxSPIPS, busdev.qdev, d);
int i;
for (i = 0; i < R_MAX; i++) {
s->regs[i] = 0;
}
fifo8_reset(&s->rx_fifo);
fifo8_reset(&s->rx_fifo);
/* non zero resets */
s->regs[R_CONFIG] |= MODEFAIL_GEN_EN;
s->regs[R_SLAVE_IDLE_COUNT] = 0xFF;
s->regs[R_TX_THRES] = 1;
s->regs[R_RX_THRES] = 1;
/* FIXME: move magic number definition somewhere sensible */
s->regs[R_MOD_ID] = 0x01090106;
xilinx_spips_update_ixr(s);
xilinx_spips_update_cs_lines(s);
}
static void xilinx_spips_flush_txfifo(XilinxSPIPS *s)
{
for (;;) {
uint32_t r;
uint8_t value;
if (fifo8_is_empty(&s->tx_fifo)) {
s->regs[R_INTR_STATUS] |= IXR_TX_FIFO_UNDERFLOW;
break;
} else {
value = fifo8_pop(&s->tx_fifo);
}
r = ssi_transfer(s->spi, (uint32_t)value);
DB_PRINT("tx = %02x rx = %02x\n", value, r);
if (fifo8_is_full(&s->rx_fifo)) {
s->regs[R_INTR_STATUS] |= IXR_RX_FIFO_OVERFLOW;
DB_PRINT("rx FIFO overflow");
} else {
fifo8_push(&s->rx_fifo, (uint8_t)r);
}
}
xilinx_spips_update_ixr(s);
}
static uint64_t xilinx_spips_read(void *opaque, hwaddr addr,
unsigned size)
{
XilinxSPIPS *s = opaque;
uint32_t mask = ~0;
uint32_t ret;
addr >>= 2;
switch (addr) {
case R_CONFIG:
mask = 0x0002FFFF;
break;
case R_INTR_STATUS:
case R_INTR_MASK:
mask = IXR_ALL;
break;
case R_EN:
mask = 0x1;
break;
case R_SLAVE_IDLE_COUNT:
mask = 0xFF;
break;
case R_MOD_ID:
mask = 0x01FFFFFF;
break;
case R_INTR_EN:
case R_INTR_DIS:
case R_TX_DATA:
mask = 0;
break;
case R_RX_DATA:
ret = (uint32_t)fifo8_pop(&s->rx_fifo);
DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr * 4, ret);
xilinx_spips_update_ixr(s);
return ret;
}
DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr * 4, s->regs[addr] & mask);
return s->regs[addr] & mask;
}
static void xilinx_spips_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
int mask = ~0;
int man_start_com = 0;
XilinxSPIPS *s = opaque;
DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr, (unsigned)value);
addr >>= 2;
switch (addr) {
case R_CONFIG:
mask = 0x0002FFFF;
if (value & MAN_START_COM) {
man_start_com = 1;
}
break;
case R_INTR_STATUS:
mask = IXR_ALL;
s->regs[R_INTR_STATUS] &= ~(mask & value);
goto no_reg_update;
case R_INTR_DIS:
mask = IXR_ALL;
s->regs[R_INTR_MASK] &= ~(mask & value);
goto no_reg_update;
case R_INTR_EN:
mask = IXR_ALL;
s->regs[R_INTR_MASK] |= mask & value;
goto no_reg_update;
case R_EN:
mask = 0x1;
break;
case R_SLAVE_IDLE_COUNT:
mask = 0xFF;
break;
case R_RX_DATA:
case R_INTR_MASK:
case R_MOD_ID:
mask = 0;
break;
case R_TX_DATA:
fifo8_push(&s->tx_fifo, (uint8_t)value);
goto no_reg_update;
}
s->regs[addr] = (s->regs[addr] & ~mask) | (value & mask);
no_reg_update:
if (man_start_com) {
xilinx_spips_flush_txfifo(s);
}
xilinx_spips_update_ixr(s);
xilinx_spips_update_cs_lines(s);
}
static const MemoryRegionOps spips_ops = {
.read = xilinx_spips_read,
.write = xilinx_spips_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static int xilinx_spips_init(SysBusDevice *dev)
{
XilinxSPIPS *s = FROM_SYSBUS(typeof(*s), dev);
int i;
DB_PRINT("inited device model\n");
s->spi = ssi_create_bus(&dev->qdev, "spi");
ssi_auto_connect_slaves(DEVICE(s), s->cs_lines, s->spi);
sysbus_init_irq(dev, &s->irq);
for (i = 0; i < NUM_CS_LINES; ++i) {
sysbus_init_irq(dev, &s->cs_lines[i]);
}
memory_region_init_io(&s->iomem, &spips_ops, s, "spi", R_MAX*4);
sysbus_init_mmio(dev, &s->iomem);
s->irqline = -1;
fifo8_create(&s->rx_fifo, RXFF_A);
fifo8_create(&s->tx_fifo, TXFF_A);
return 0;
}
static int xilinx_spips_post_load(void *opaque, int version_id)
{
xilinx_spips_update_ixr((XilinxSPIPS *)opaque);
xilinx_spips_update_cs_lines((XilinxSPIPS *)opaque);
return 0;
}
static const VMStateDescription vmstate_xilinx_spips = {
.name = "xilinx_spips",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.post_load = xilinx_spips_post_load,
.fields = (VMStateField[]) {
VMSTATE_FIFO8(tx_fifo, XilinxSPIPS),
VMSTATE_FIFO8(rx_fifo, XilinxSPIPS),
VMSTATE_UINT32_ARRAY(regs, XilinxSPIPS, R_MAX),
VMSTATE_END_OF_LIST()
}
};
static void xilinx_spips_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
sdc->init = xilinx_spips_init;
dc->reset = xilinx_spips_reset;
dc->vmsd = &vmstate_xilinx_spips;
}
static const TypeInfo xilinx_spips_info = {
.name = "xilinx,spips",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(XilinxSPIPS),
.class_init = xilinx_spips_class_init,
};
static void xilinx_spips_register_types(void)
{
type_register_static(&xilinx_spips_info);
}
type_init(xilinx_spips_register_types)
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