static void imx_spi_update_irq(IMXSPIState *s)
{
int level;
if (fifo32_is_empty(&s->rx_fifo)) {
s->regs[ECSPI_STATREG] &= ~ECSPI_STATREG_RR;
} else {
s->regs[ECSPI_STATREG] |= ECSPI_STATREG_RR;
}
if (fifo32_is_full(&s->rx_fifo)) {
s->regs[ECSPI_STATREG] |= ECSPI_STATREG_RF;
} else {
s->regs[ECSPI_STATREG] &= ~ECSPI_STATREG_RF;
}
if (fifo32_is_empty(&s->tx_fifo)) {
s->regs[ECSPI_STATREG] |= ECSPI_STATREG_TE;
} else {
s->regs[ECSPI_STATREG] &= ~ECSPI_STATREG_TE;
}
if (fifo32_is_full(&s->tx_fifo)) {
s->regs[ECSPI_STATREG] |= ECSPI_STATREG_TF;
} else {
s->regs[ECSPI_STATREG] &= ~ECSPI_STATREG_TF;
}
level = s->regs[ECSPI_STATREG] & s->regs[ECSPI_INTREG] ? 1 : 0;
qemu_set_irq(s->irq, level);
DPRINTF("IRQ level is %d\n", level);
}
static void xlnx_zynqmp_qspips_update_ixr(XlnxZynqMPQSPIPS *s)
{
uint32_t gqspi_int;
int new_irqline;
s->regs[R_GQSPI_ISR] &= ~IXR_SELF_CLEAR;
s->regs[R_GQSPI_ISR] |=
(fifo32_is_empty(&s->fifo_g) ? IXR_GENERIC_FIFO_EMPTY : 0) |
(fifo32_is_full(&s->fifo_g) ? IXR_GENERIC_FIFO_FULL : 0) |
(s->fifo_g.fifo.num < s->regs[R_GQSPI_GFIFO_THRESH] ?
IXR_GENERIC_FIFO_NOT_FULL : 0) |
(fifo8_is_empty(&s->rx_fifo_g) ? IXR_RX_FIFO_EMPTY : 0) |
(fifo8_is_full(&s->rx_fifo_g) ? IXR_RX_FIFO_FULL : 0) |
(s->rx_fifo_g.num >= s->regs[R_GQSPI_RX_THRESH] ?
IXR_RX_FIFO_NOT_EMPTY : 0) |
(fifo8_is_empty(&s->tx_fifo_g) ? IXR_TX_FIFO_EMPTY : 0) |
(fifo8_is_full(&s->tx_fifo_g) ? IXR_TX_FIFO_FULL : 0) |
(s->tx_fifo_g.num < s->regs[R_GQSPI_TX_THRESH] ?
IXR_TX_FIFO_NOT_FULL : 0);
/* GQSPI Interrupt Trigger Status */
gqspi_int = (~s->regs[R_GQSPI_IMR]) & s->regs[R_GQSPI_ISR] & GQSPI_IXR_MASK;
new_irqline = !!(gqspi_int & IXR_ALL);
/* drive external interrupt pin */
if (new_irqline != s->gqspi_irqline) {
s->gqspi_irqline = new_irqline;
qemu_set_irq(XILINX_SPIPS(s)->irq, s->gqspi_irqline);
}
}
static void imx_spi_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
IMXSPIState *s = opaque;
uint32_t index = offset >> 2;
uint32_t change_mask;
if (index >= ECSPI_MAX) {
qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
HWADDR_PRIx "\n", TYPE_IMX_SPI, __func__, offset);
return;
}
DPRINTF("reg[%s] <= 0x%" PRIx32 "\n", imx_spi_reg_name(index),
(uint32_t)value);
change_mask = s->regs[index] ^ value;
switch (index) {
case ECSPI_RXDATA:
qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Trying to write to RX FIFO\n",
TYPE_IMX_SPI, __func__);
break;
case ECSPI_TXDATA:
case ECSPI_MSGDATA:
/* Is there any difference between TXDATA and MSGDATA ? */
/* I'll have to look in the linux driver */
if (!imx_spi_is_enabled(s)) {
/* Ignore writes if device is disabled */
break;
} else if (fifo32_is_full(&s->tx_fifo)) {
/* Ignore writes if queue is full */
break;
}
fifo32_push(&s->tx_fifo, (uint32_t)value);
if (imx_spi_channel_is_master(s) &&
(s->regs[ECSPI_CONREG] & ECSPI_CONREG_SMC)) {
/*
* Start emitting if current channel is master and SMC bit is
* set.
*/
imx_spi_flush_txfifo(s);
}
break;
case ECSPI_STATREG:
/* the RO and TC bits are write-one-to-clear */
value &= ECSPI_STATREG_RO | ECSPI_STATREG_TC;
s->regs[ECSPI_STATREG] &= ~value;
break;
case ECSPI_CONREG:
s->regs[ECSPI_CONREG] = value;
if (!imx_spi_is_enabled(s)) {
/* device is disabled, so this is a reset */
imx_spi_reset(DEVICE(s));
return;
}
if (imx_spi_channel_is_master(s)) {
int i;
/* We are in master mode */
for (i = 0; i < 4; i++) {
qemu_set_irq(s->cs_lines[i],
i == imx_spi_selected_channel(s) ? 0 : 1);
}
if ((value & change_mask & ECSPI_CONREG_SMC) &&
!fifo32_is_empty(&s->tx_fifo)) {
/* SMC bit is set and TX FIFO has some slots filled in */
imx_spi_flush_txfifo(s);
} else if ((value & change_mask & ECSPI_CONREG_XCH) &&
!(value & ECSPI_CONREG_SMC)) {
/* This is a request to start emitting */
imx_spi_flush_txfifo(s);
}
}
break;
default:
s->regs[index] = value;
break;
}
imx_spi_update_irq(s);
}
static void imx_spi_flush_txfifo(IMXSPIState *s)
{
uint32_t tx;
uint32_t rx;
DPRINTF("Begin: TX Fifo Size = %d, RX Fifo Size = %d\n",
fifo32_num_used(&s->tx_fifo), fifo32_num_used(&s->rx_fifo));
while (!fifo32_is_empty(&s->tx_fifo)) {
int tx_burst = 0;
int index = 0;
if (s->burst_length <= 0) {
s->burst_length = imx_spi_burst_length(s);
DPRINTF("Burst length = %d\n", s->burst_length);
if (imx_spi_is_multiple_master_burst(s)) {
s->regs[ECSPI_CONREG] |= ECSPI_CONREG_XCH;
}
}
tx = fifo32_pop(&s->tx_fifo);
DPRINTF("data tx:0x%08x\n", tx);
tx_burst = MIN(s->burst_length, 32);
rx = 0;
while (tx_burst) {
uint8_t byte = tx & 0xff;
DPRINTF("writing 0x%02x\n", (uint32_t)byte);
/* We need to write one byte at a time */
byte = ssi_transfer(s->bus, byte);
DPRINTF("0x%02x read\n", (uint32_t)byte);
tx = tx >> 8;
rx |= (byte << (index * 8));
/* Remove 8 bits from the actual burst */
tx_burst -= 8;
s->burst_length -= 8;
index++;
}
DPRINTF("data rx:0x%08x\n", rx);
if (fifo32_is_full(&s->rx_fifo)) {
s->regs[ECSPI_STATREG] |= ECSPI_STATREG_RO;
} else {
fifo32_push(&s->rx_fifo, (uint8_t)rx);
}
if (s->burst_length <= 0) {
s->regs[ECSPI_CONREG] &= ~ECSPI_CONREG_XCH;
if (!imx_spi_is_multiple_master_burst(s)) {
s->regs[ECSPI_STATREG] |= ECSPI_STATREG_TC;
break;
}
}
}
if (fifo32_is_empty(&s->tx_fifo)) {
s->regs[ECSPI_STATREG] |= ECSPI_STATREG_TC;
}
/* TODO: We should also use TDR and RDR bits */
DPRINTF("End: TX Fifo Size = %d, RX Fifo Size = %d\n",
fifo32_num_used(&s->tx_fifo), fifo32_num_used(&s->rx_fifo));
}
