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spi: zynqmp_gqspi: Add support for IO mode

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Add support for io-mode transfers. This is necessary for UBIFS to work
properly with spi-nor devices. The driver will work in IO mode when
"has-io-mode" is passed from device tree instead of DMA.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Link: https://lore.kernel.org/r/20220825125906.11581-4-ashok.reddy.soma@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Ashok Reddy Soma 2022-08-25 06:59:03 -06:00 committed by Michal Simek
parent 9e89e30d4d
commit d91b0f4a18
1 changed files with 76 additions and 5 deletions
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81
drivers/spi/zynqmp_gqspi.c
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@ -166,6 +166,7 @@ struct zynqmp_qspi_plat {
struct zynqmp_qspi_dma_regs *dma_regs;
u32 frequency;
u32 speed_hz;
unsigned int io_mode;
};
struct zynqmp_qspi_priv {
@ -174,6 +175,7 @@ struct zynqmp_qspi_priv {
const void *tx_buf;
void *rx_buf;
unsigned int len;
unsigned int io_mode;
int bytes_to_transfer;
int bytes_to_receive;
const struct spi_mem_op *op;
@ -190,6 +192,8 @@ static int zynqmp_qspi_of_to_plat(struct udevice *bus)
plat->dma_regs = (struct zynqmp_qspi_dma_regs *)
(dev_read_addr(bus) + GQSPI_DMA_REG_OFFSET);
plat->io_mode = dev_read_bool(bus, "has-io-mode");
return 0;
}
@ -209,8 +213,11 @@ static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv)
config_reg = readl(&regs->confr);
config_reg &= ~(GQSPI_GFIFO_STRT_MODE_MASK |
GQSPI_CONFIG_MODE_EN_MASK);
config_reg |= GQSPI_CONFIG_DMA_MODE | GQSPI_GFIFO_WP_HOLD |
GQSPI_DFLT_BAUD_RATE_DIV | GQSPI_GFIFO_STRT_MODE_MASK;
config_reg |= GQSPI_GFIFO_WP_HOLD | GQSPI_DFLT_BAUD_RATE_DIV;
config_reg |= GQSPI_GFIFO_STRT_MODE_MASK;
if (!priv->io_mode)
config_reg |= GQSPI_CONFIG_DMA_MODE;
writel(config_reg, &regs->confr);
writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
@ -388,6 +395,7 @@ static int zynqmp_qspi_probe(struct udevice *bus)
priv->regs = plat->regs;
priv->dma_regs = plat->dma_regs;
priv->io_mode = plat->io_mode;
ret = clk_get_by_index(bus, 0, &clk);
if (ret < 0) {
@ -592,6 +600,66 @@ static int zynqmp_qspi_genfifo_fill_tx(struct zynqmp_qspi_priv *priv)
return ret;
}
static int zynqmp_qspi_start_io(struct zynqmp_qspi_priv *priv,
u32 gen_fifo_cmd, u32 *buf)
{
u32 len;
u32 actuallen = priv->len;
u32 config_reg, ier, isr;
u32 timeout = GQSPI_TIMEOUT;
struct zynqmp_qspi_regs *regs = priv->regs;
u32 last_bits;
u32 *traverse = buf;
while (priv->len) {
len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
/* If exponent bit is set, reset immediate to be 2^len */
if (gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK)
priv->bytes_to_receive = (1 << len);
else
priv->bytes_to_receive = len;
zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
/* Manual start */
config_reg = readl(&regs->confr);
config_reg |= GQSPI_STRT_GEN_FIFO;
writel(config_reg, &regs->confr);
/* Enable RX interrupts for IO mode */
ier = readl(&regs->ier);
ier |= GQSPI_IXR_ALL_MASK;
writel(ier, &regs->ier);
while (priv->bytes_to_receive && timeout) {
isr = readl(&regs->isr);
if (isr & GQSPI_IXR_RXNEMTY_MASK) {
if (priv->bytes_to_receive >= 4) {
*traverse = readl(&regs->drxr);
traverse++;
priv->bytes_to_receive -= 4;
} else {
last_bits = readl(&regs->drxr);
memcpy(traverse, &last_bits,
priv->bytes_to_receive);
priv->bytes_to_receive = 0;
}
timeout = GQSPI_TIMEOUT;
} else {
udelay(1);
timeout--;
}
}
debug("buf:0x%lx, rxbuf:0x%lx, *buf:0x%x len: 0x%x\n",
(unsigned long)buf, (unsigned long)priv->rx_buf,
*buf, actuallen);
if (!timeout) {
printf("IO timeout: %d\n", readl(&regs->isr));
return -1;
}
}
return 0;
}
static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
u32 gen_fifo_cmd, u32 *buf)
{
@ -649,10 +717,13 @@ static int zynqmp_qspi_genfifo_fill_rx(struct zynqmp_qspi_priv *priv)
* Check if receive buffer is aligned to 4 byte and length
* is multiples of four byte as we are using dma to receive.
*/
if (!((unsigned long)priv->rx_buf & (GQSPI_DMA_ALIGN - 1)) &&
!(actuallen % GQSPI_DMA_ALIGN)) {
if ((!((unsigned long)priv->rx_buf & (GQSPI_DMA_ALIGN - 1)) &&
!(actuallen % GQSPI_DMA_ALIGN)) || priv->io_mode) {
buf = (u32 *)priv->rx_buf;
return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
if (priv->io_mode)
return zynqmp_qspi_start_io(priv, gen_fifo_cmd, buf);
else
return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
}
ALLOC_CACHE_ALIGN_BUFFER(u8, tmp, roundup(priv->len,