Commit fd806575 authored by Chuanhong Guo's avatar Chuanhong Guo Committed by Mark Brown

spi: spi-mtk-nor: add helper for checking prg mode ops

op checking/resizing logic for the newly added mtk_nor_spi_mem_prg is
more complicated. Add two helper functions for them:
mtk_nor_match_prg: check whether an op is supported by prg mode.
mtk_nor_adj_prg_size: adjust data size for mtk_nor_spi_mem_prg.

mtk_nor_match_prg isn't called yet because supports_op is currently
broken. It'll be used in the next fix commit.
Signed-off-by: default avatarChuanhong Guo <gch981213@gmail.com>
Link: https://lore.kernel.org/r/20200924152730.733243-3-gch981213@gmail.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent e7edd2cf
...@@ -168,10 +168,76 @@ static bool mtk_nor_match_read(const struct spi_mem_op *op) ...@@ -168,10 +168,76 @@ static bool mtk_nor_match_read(const struct spi_mem_op *op)
return false; return false;
} }
static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) static bool mtk_nor_match_prg(const struct spi_mem_op *op)
{ {
size_t len; int tx_len, rx_len, prg_len, prg_left;
// prg mode is spi-only.
if ((op->cmd.buswidth > 1) || (op->addr.buswidth > 1) ||
(op->dummy.buswidth > 1) || (op->data.buswidth > 1))
return false;
tx_len = op->cmd.nbytes + op->addr.nbytes;
if (op->data.dir == SPI_MEM_DATA_OUT) {
// count dummy bytes only if we need to write data after it
tx_len += op->dummy.nbytes;
// leave at least one byte for data
if (tx_len > MTK_NOR_REG_PRGDATA_MAX)
return false;
// if there's no addr, meaning adjust_op_size is impossible,
// check data length as well.
if ((!op->addr.nbytes) &&
(tx_len + op->data.nbytes > MTK_NOR_REG_PRGDATA_MAX + 1))
return false;
} else if (op->data.dir == SPI_MEM_DATA_IN) {
if (tx_len > MTK_NOR_REG_PRGDATA_MAX + 1)
return false;
rx_len = op->data.nbytes;
prg_left = MTK_NOR_PRG_CNT_MAX / 8 - tx_len - op->dummy.nbytes;
if (prg_left > MTK_NOR_REG_SHIFT_MAX + 1)
prg_left = MTK_NOR_REG_SHIFT_MAX + 1;
if (rx_len > prg_left) {
if (!op->addr.nbytes)
return false;
rx_len = prg_left;
}
prg_len = tx_len + op->dummy.nbytes + rx_len;
if (prg_len > MTK_NOR_PRG_CNT_MAX / 8)
return false;
} else {
prg_len = tx_len + op->dummy.nbytes;
if (prg_len > MTK_NOR_PRG_CNT_MAX / 8)
return false;
}
return true;
}
static void mtk_nor_adj_prg_size(struct spi_mem_op *op)
{
int tx_len, tx_left, prg_left;
tx_len = op->cmd.nbytes + op->addr.nbytes;
if (op->data.dir == SPI_MEM_DATA_OUT) {
tx_len += op->dummy.nbytes;
tx_left = MTK_NOR_REG_PRGDATA_MAX + 1 - tx_len;
if (op->data.nbytes > tx_left)
op->data.nbytes = tx_left;
} else if (op->data.dir == SPI_MEM_DATA_IN) {
prg_left = MTK_NOR_PRG_CNT_MAX / 8 - tx_len - op->dummy.nbytes;
if (prg_left > MTK_NOR_REG_SHIFT_MAX + 1)
prg_left = MTK_NOR_REG_SHIFT_MAX + 1;
if (op->data.nbytes > prg_left)
op->data.nbytes = prg_left;
}
}
static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
{
if (!op->data.nbytes) if (!op->data.nbytes)
return 0; return 0;
...@@ -200,11 +266,7 @@ static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) ...@@ -200,11 +266,7 @@ static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
} }
} }
len = MTK_NOR_PRG_MAX_SIZE - op->cmd.nbytes - op->addr.nbytes - mtk_nor_adj_prg_size(op);
op->dummy.nbytes;
if (op->data.nbytes > len)
op->data.nbytes = len;
return 0; return 0;
} }
......
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