From 906e20a613abdcba5f558ac8e93cb6fad464f786 Mon Sep 17 00:00:00 2001
From: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Date: Fri, 25 Nov 2022 16:14:13 +0530
Subject: [PATCH] spi: zynqmp_qspi: Add support for 64-bit read/write
When we pass the 64-bit address to read/write, only lower 32-bit
address is getting updated. Program the upper 32-bit address in the
DMA destination memory address MSBs register, which can handle upto
44-bit destination address.
Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Link: https://lore.kernel.org/r/20221125104413.26140-1-venkatesh.abbarapu@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
---
drivers/spi/zynqmp_gqspi.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/zynqmp_gqspi.c b/drivers/spi/zynqmp_gqspi.c
index 83a5c8aebf..335b458cb9 100644
--- a/drivers/spi/zynqmp_gqspi.c
+++ b/drivers/spi/zynqmp_gqspi.c
@@ -662,7 +662,7 @@ static int zynqmp_qspi_start_io(struct zynqmp_qspi_priv *priv,
static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
u32 gen_fifo_cmd, u32 *buf)
{
- u32 addr;
+ unsigned long addr;
u32 size;
u32 actuallen = priv->len;
u32 totallen = priv->len;
@@ -678,7 +678,9 @@ static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
totallen -= priv->len; /* Save remaining bytes length to read */
actuallen = priv->len; /* Actual number of bytes reading */
- writel((unsigned long)buf, &dma_regs->dmadst);
+ writel(lower_32_bits((unsigned long)buf), &dma_regs->dmadst);
+ writel(upper_32_bits((unsigned long)buf) & GENMASK(11, 0),
+ &dma_regs->dmadstmsb);
writel(roundup(priv->len, GQSPI_DMA_ALIGN), &dma_regs->dmasize);
writel(GQSPI_DMA_DST_I_STS_MASK, &dma_regs->dmaier);
addr = (unsigned long)buf;
--
2.39.5