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spi: zynqmp_gqspi: Fix dma alignment issue

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DMA is aligned to ARCH_DMA_MINALIGN(64 bytes), but as per spec, alignment
required is 4bytes only. Change DMA alignment from ARCH_DMA_MINALIGN to
GQSPI_DMA_ALIGN. Remove alignment of data length in non-exponential case.

Some minor improvements in the initialization to initialize gen_fifo
threshold and disable qspi controller while setting config register.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Ashok Reddy Soma 2021-08-20 07:43:17 -06:00 committed by Michal Simek
parent 72022a5b2e
commit 020b353be9
1 changed files with 7 additions and 9 deletions
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16
drivers/spi/zynqmp_gqspi.c
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@ -77,6 +77,7 @@
#define GQSPI_GFIFO_SELECT BIT(0)
#define GQSPI_FIFO_THRESHOLD 1
#define GQSPI_GENFIFO_THRESHOLD 31
#define SPI_XFER_ON_BOTH 0
#define SPI_XFER_ON_LOWER 1
@ -197,7 +198,9 @@ static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv)
writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->idisr);
writel(GQSPI_FIFO_THRESHOLD, &regs->txftr);
writel(GQSPI_FIFO_THRESHOLD, &regs->rxftr);
writel(GQSPI_GENFIFO_THRESHOLD, &regs->gqfthr);
writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->isr);
writel(~GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
config_reg = readl(&regs->confr);
config_reg &= ~(GQSPI_GFIFO_STRT_MODE_MASK |
@ -572,25 +575,20 @@ static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
u32 gen_fifo_cmd, u32 *buf)
{
u32 addr;
u32 size, len;
u32 size;
u32 actuallen = priv->len;
int ret = 0;
struct zynqmp_qspi_dma_regs *dma_regs = priv->dma_regs;
writel((unsigned long)buf, &dma_regs->dmadst);
writel(roundup(priv->len, ARCH_DMA_MINALIGN), &dma_regs->dmasize);
writel(roundup(priv->len, GQSPI_DMA_ALIGN), &dma_regs->dmasize);
writel(GQSPI_DMA_DST_I_STS_MASK, &dma_regs->dmaier);
addr = (unsigned long)buf;
size = roundup(priv->len, ARCH_DMA_MINALIGN);
size = roundup(priv->len, GQSPI_DMA_ALIGN);
flush_dcache_range(addr, addr + size);
while (priv->len) {
len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
if (!(gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK) &&
(len % ARCH_DMA_MINALIGN)) {
gen_fifo_cmd &= ~GENMASK(7, 0);
gen_fifo_cmd |= roundup(len, ARCH_DMA_MINALIGN);
}
zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);