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Subject[PATCH v3 12/14] spi: mxic: patch for octal DTR mode support
Date
Driver patch for octal 8D-8D-8D mode support.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
---
drivers/spi/spi-mxic.c | 101 +++++++++++++++++++++++++++++++++----------------
1 file changed, 69 insertions(+), 32 deletions(-)

diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c
index 69491f3..c83c8c2 100644
--- a/drivers/spi/spi-mxic.c
+++ b/drivers/spi/spi-mxic.c
@@ -280,10 +280,58 @@ static void mxic_spi_hw_init(struct mxic_spi *mxic)
mxic->regs + HC_CFG);
}

+static u32 mxic_spi_mem_prep_op_cfg(const struct spi_mem_op *op)
+{
+ u32 cfg = OP_CMD_BYTES(op->cmd.nbytes) |
+ OP_CMD_BUSW(fls(op->cmd.buswidth) - 1) |
+ (op->cmd.dtr ? OP_CMD_DDR : 0);
+
+ if (op->addr.nbytes)
+ cfg |= OP_ADDR_BYTES(op->addr.nbytes) |
+ OP_ADDR_BUSW(fls(op->addr.buswidth) - 1) |
+ (op->addr.dtr ? OP_ADDR_DDR : 0);
+
+ if (op->dummy.nbytes)
+ cfg |= OP_DUMMY_CYC(op->dummy.nbytes);
+
+ if (op->data.nbytes) {
+ cfg |= OP_DATA_BUSW(fls(op->data.buswidth) - 1) |
+ (op->data.dtr ? OP_DATA_DDR : 0);
+ if (op->data.dir == SPI_MEM_DATA_IN) {
+ cfg |= OP_READ;
+ if (op->data.dtr == OP_DATA_DDR)
+ cfg |= OP_DQS_EN;
+ }
+ }
+
+ return cfg;
+}
+
+static void mxic_spi_set_hc_cfg(struct spi_device *spi, u32 flags)
+{
+ struct mxic_spi *mxic = spi_master_get_devdata(spi->master);
+ int nio = 1;
+
+ if (spi->mode & (SPI_RX_OCTAL | SPI_TX_OCTAL))
+ nio = 8;
+ else if (spi->mode & (SPI_TX_QUAD | SPI_RX_QUAD))
+ nio = 4;
+ else if (spi->mode & (SPI_TX_DUAL | SPI_RX_DUAL))
+ nio = 2;
+
+ writel(flags | HC_CFG_NIO(nio) |
+ HC_CFG_TYPE(spi->chip_select, HC_CFG_TYPE_SPI_NOR) |
+ HC_CFG_SLV_ACT(spi->chip_select) | HC_CFG_IDLE_SIO_LVL(1),
+ mxic->regs + HC_CFG);
+}
+
static int mxic_spi_data_xfer(struct mxic_spi *mxic, const void *txbuf,
void *rxbuf, unsigned int len)
{
unsigned int pos = 0;
+ bool dtr_enabled;
+
+ dtr_enabled = (readl(mxic->regs + SS_CTRL(0)) & OP_DATA_DDR);

while (pos < len) {
unsigned int nbytes = len - pos;
@@ -302,6 +350,9 @@ static int mxic_spi_data_xfer(struct mxic_spi *mxic, const void *txbuf,
if (ret)
return ret;

+ if (dtr_enabled && len & 0x1)
+ nbytes++;
+
writel(data, mxic->regs + TXD(nbytes % 4));

if (rxbuf) {
@@ -319,6 +370,8 @@ static int mxic_spi_data_xfer(struct mxic_spi *mxic, const void *txbuf,

data = readl(mxic->regs + RXD);
data >>= (8 * (4 - nbytes));
+ if (dtr_enabled && len & 0x1)
+ nbytes++;
memcpy(rxbuf + pos, &data, nbytes);
WARN_ON(readl(mxic->regs + INT_STS) & INT_RX_NOT_EMPTY);
} else {
@@ -335,8 +388,8 @@ static int mxic_spi_data_xfer(struct mxic_spi *mxic, const void *txbuf,
static bool mxic_spi_mem_supports_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
- if (op->data.buswidth > 4 || op->addr.buswidth > 4 ||
- op->dummy.buswidth > 4 || op->cmd.buswidth > 4)
+ if (op->data.buswidth > 8 || op->addr.buswidth > 8 ||
+ op->dummy.buswidth > 8 || op->cmd.buswidth > 8)
return false;

if (op->data.nbytes && op->dummy.nbytes &&
@@ -346,6 +399,9 @@ static bool mxic_spi_mem_supports_op(struct spi_mem *mem,
if (op->addr.nbytes > 7)
return false;

+ if (op->cmd.buswidth == 8 && op->cmd.nbytes == 2)
+ return true;
+
return spi_mem_default_supports_op(mem, op);
}

@@ -353,47 +409,27 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
struct mxic_spi *mxic = spi_master_get_devdata(mem->spi->master);
- int nio = 1, i, ret;
- u32 ss_ctrl;
- u8 addr[8];
+ int i, ret;
+ u8 addr[8], cmd[2];

ret = mxic_spi_set_freq(mxic, mem->spi->max_speed_hz);
if (ret)
return ret;

- if (mem->spi->mode & (SPI_TX_QUAD | SPI_RX_QUAD))
- nio = 4;
- else if (mem->spi->mode & (SPI_TX_DUAL | SPI_RX_DUAL))
- nio = 2;
+ mxic_spi_set_hc_cfg(mem->spi, HC_CFG_MAN_CS_EN);

- writel(HC_CFG_NIO(nio) |
- HC_CFG_TYPE(mem->spi->chip_select, HC_CFG_TYPE_SPI_NOR) |
- HC_CFG_SLV_ACT(mem->spi->chip_select) | HC_CFG_IDLE_SIO_LVL(1) |
- HC_CFG_MAN_CS_EN,
- mxic->regs + HC_CFG);
writel(HC_EN_BIT, mxic->regs + HC_EN);

- ss_ctrl = OP_CMD_BYTES(1) | OP_CMD_BUSW(fls(op->cmd.buswidth) - 1);
-
- if (op->addr.nbytes)
- ss_ctrl |= OP_ADDR_BYTES(op->addr.nbytes) |
- OP_ADDR_BUSW(fls(op->addr.buswidth) - 1);
-
- if (op->dummy.nbytes)
- ss_ctrl |= OP_DUMMY_CYC(op->dummy.nbytes);
-
- if (op->data.nbytes) {
- ss_ctrl |= OP_DATA_BUSW(fls(op->data.buswidth) - 1);
- if (op->data.dir == SPI_MEM_DATA_IN)
- ss_ctrl |= OP_READ;
- }
-
- writel(ss_ctrl, mxic->regs + SS_CTRL(mem->spi->chip_select));
+ writel(mxic_spi_mem_prep_op_cfg(op),
+ mxic->regs + SS_CTRL(mem->spi->chip_select));

writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT,
mxic->regs + HC_CFG);

- ret = mxic_spi_data_xfer(mxic, &op->cmd.opcode, NULL, 1);
+ for (i = 0; i < op->cmd.nbytes; i++)
+ cmd[i] = op->cmd.opcode >> (8 * (op->cmd.nbytes - i - 1));
+
+ ret = mxic_spi_data_xfer(mxic, cmd, NULL, op->cmd.nbytes);
if (ret)
goto out;

@@ -566,7 +602,8 @@ static int mxic_spi_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->mode_bits = SPI_CPOL | SPI_CPHA |
SPI_RX_DUAL | SPI_TX_DUAL |
- SPI_RX_QUAD | SPI_TX_QUAD;
+ SPI_RX_QUAD | SPI_TX_QUAD |
+ SPI_RX_OCTAL | SPI_TX_OCTAL;

mxic_spi_hw_init(mxic);

--
1.9.1
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