This adds support for DUAL/QUAD/OCTAL transfers. This adds dw_spi_supports_op to do some sanity checks which would otherwise live in exec_op. We only support byte transfers, but as far as I could tell only bytes are supported by mem_ops (e.g. every part of the opcode has nbytes).
Signed-off-by: Sean Anderson seanga2@gmail.com ---
drivers/spi/designware_spi.c | 147 +++++++++++++++++++++++++++++++---- 1 file changed, 130 insertions(+), 17 deletions(-)
diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c index 169888a06d..4796d55b20 100644 --- a/drivers/spi/designware_spi.c +++ b/drivers/spi/designware_spi.c @@ -215,7 +215,8 @@ static u32 dw_spi_update_cr0(struct dw_spi_priv *priv) priv->bits_per_word - 1) | FIELD_PREP(DWC_SSI_CTRLR0_FRF_MASK, priv->type) | FIELD_PREP(DWC_SSI_CTRLR0_MODE_MASK, priv->mode) - | FIELD_PREP(DWC_SSI_CTRLR0_TMOD_MASK, priv->tmode); + | FIELD_PREP(DWC_SSI_CTRLR0_TMOD_MASK, priv->tmode) + | FIELD_PREP(DWC_SSI_CTRLR0_SPI_FRF_MASK, priv->spi_frf); } else { if (priv->caps & DW_SPI_CAP_DFS32) cr0 = FIELD_PREP(CTRLR0_DFS_32_MASK, @@ -226,12 +227,36 @@ static u32 dw_spi_update_cr0(struct dw_spi_priv *priv)
cr0 |= FIELD_PREP(CTRLR0_FRF_MASK, priv->type) | FIELD_PREP(CTRLR0_MODE_MASK, priv->mode) - | FIELD_PREP(CTRLR0_TMOD_MASK, priv->tmode); + | FIELD_PREP(CTRLR0_TMOD_MASK, priv->tmode) + | FIELD_PREP(CTRLR0_SPI_FRF_MASK, priv->spi_frf); }
return cr0; }
+static u32 dw_spi_update_spi_cr0(const struct spi_mem_op *op) +{ + uint trans_type, wait_cycles; + + /* This assumes support_op has filtered invalid types */ + if (op->addr.buswidth == 1) + trans_type = SPI_CTRLR0_TRANS_TYPE_1_1_X; + else if (op->cmd.buswidth == 1) + trans_type = SPI_CTRLR0_TRANS_TYPE_1_X_X; + else + trans_type = SPI_CTRLR0_TRANS_TYPE_X_X_X; + + if (op->dummy.buswidth) + wait_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth; + else + wait_cycles = 0; + + return FIELD_PREP(SPI_CTRLR0_TRANS_TYPE, trans_type) + | FIELD_PREP(SPI_CTRLR0_ADDR_L_MASK, op->addr.nbytes * 2) + | FIELD_PREP(SPI_CTRLR0_INST_L_MASK, 2) + | FIELD_PREP(SPI_CTRLR0_WAIT_CYCLES_MASK, wait_cycles); +} + static int request_gpio_cs(struct udevice *bus) { #if CONFIG_IS_ENABLED(DM_GPIO) && !defined(CONFIG_SPL_BUILD) @@ -302,6 +327,17 @@ static void spi_hw_init(struct udevice *bus, struct dw_spi_priv *priv) if (priv->caps & DW_SPI_CAP_DWC_SSI || !FIELD_GET(CTRLR0_DFS_MASK, cr0)) priv->caps |= DW_SPI_CAP_DFS32;
+ /* + * If SPI_FRF exists that means we have DUAL, QUAD, or OCTAL. Since we + * can't differentiate, just set DUAL + */ + if (priv->caps & DW_SPI_CAP_DWC_SSI) { + if (FIELD_GET(DWC_SSI_CTRLR0_SPI_FRF_MASK, cr0)) + priv->caps |= DW_SPI_CAP_DUAL; + } else if (FIELD_GET(CTRLR0_SPI_FRF_MASK, cr0)) { + priv->caps |= DW_SPI_CAP_DUAL; + } + dw_write(priv, DW_SPI_SSIENR, 1);
/* @@ -604,6 +640,13 @@ static int dw_spi_xfer(struct udevice *dev, unsigned int bitlen, u32 val, cs; uint frames;
+ /* DUAL/QUAD/OCTAL only supported by exec_op for now */ + if (priv->mode & (SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL | + SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL)) + return -1; + + priv->spi_frf = CTRLR0_SPI_FRF_BYTE; + /* spi core configured to do 8 bit transfers */ if (bitlen % priv->bits_per_word) { dev_err(dev, "Non byte aligned SPI transfer.\n"); @@ -682,6 +725,9 @@ static int dw_spi_xfer(struct udevice *dev, unsigned int bitlen, /* * This function is necessary for reading SPI flash with the native CS * c.f. https://lkml.org/lkml/2015/12/23/132 + * + * It also lets us handle DUAL/QUAD/OCTAL transfers in a much more idiomatic + * way. */ static int dw_spi_exec_op(struct spi_slave *slave, const struct spi_mem_op *op) { @@ -692,37 +738,72 @@ static int dw_spi_exec_op(struct spi_slave *slave, const struct spi_mem_op *op) struct spi_mem_op *mut_op = (struct spi_mem_op *)op; u8 op_len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes; u8 op_buf[op_len]; - u32 cr0, val; + u32 cr0, spi_cr0, val; + + /* Only bytes are supported for spi-mem transfers */ + if (priv->bits_per_word != 8) + return -EINVAL; + + switch (op->data.buswidth) { + case 0: + case 1: + priv->spi_frf = CTRLR0_SPI_FRF_BYTE; + break; + case 2: + priv->spi_frf = CTRLR0_SPI_FRF_DUAL; + break; + case 4: + priv->spi_frf = CTRLR0_SPI_FRF_QUAD; + break; + case 8: + priv->spi_frf = CTRLR0_SPI_FRF_OCTAL; + break; + /* BUG: should have been filtered out by supports_op */ + default: + return -EINVAL; + }
if (read) - priv->tmode = CTRLR0_TMOD_EPROMREAD; + if (priv->spi_frf == CTRLR0_SPI_FRF_BYTE) + priv->tmode = CTRLR0_TMOD_EPROMREAD; + else + priv->tmode = CTRLR0_TMOD_RO; else priv->tmode = CTRLR0_TMOD_TO;
cr0 = dw_spi_update_cr0(priv); - dev_dbg(bus, "cr0=%08x buf=%p len=%u [bytes]\n", cr0, op->data.buf.in, - op->data.nbytes); + spi_cr0 = dw_spi_update_spi_cr0(op); + dev_dbg(bus, "cr0=%08x spi_cr0=%08x buf=%p len=%u [bytes]\n", cr0, + spi_cr0, op->data.buf.in, op->data.nbytes);
dw_write(priv, DW_SPI_SSIENR, 0); dw_write(priv, DW_SPI_CTRLR0, cr0); if (read) dw_write(priv, DW_SPI_CTRLR1, op->data.nbytes - 1); + if (priv->spi_frf != CTRLR0_SPI_FRF_BYTE) + dw_write(priv, DW_SPI_SPI_CTRL0, spi_cr0); dw_write(priv, DW_SPI_SSIENR, 1);
- /* From spi_mem_exec_op */ - pos = 0; - op_buf[pos++] = op->cmd.opcode; - if (op->addr.nbytes) { - for (i = 0; i < op->addr.nbytes; i++) - op_buf[pos + i] = op->addr.val >> - (8 * (op->addr.nbytes - i - 1)); + /* Write out the instruction */ + if (priv->spi_frf == CTRLR0_SPI_FRF_BYTE) { + /* From spi_mem_exec_op */ + pos = 0; + op_buf[pos++] = op->cmd.opcode; + if (op->addr.nbytes) { + for (i = 0; i < op->addr.nbytes; i++) + op_buf[pos + i] = op->addr.val >> + (8 * (op->addr.nbytes - i - 1));
- pos += op->addr.nbytes; - } - if (op->dummy.nbytes) + pos += op->addr.nbytes; + } memset(op_buf + pos, 0xff, op->dummy.nbytes);
- dw_writer(priv, &op_buf, 0, op_len, 0, sizeof(u8)); + dw_writer(priv, &op_buf, 0, op_len, 0, sizeof(u8)); + } else { + /* MUST be written as byte/long; don't ask me why */ + writeb(op->cmd.opcode, priv->regs + DW_SPI_DR); + writel(op->addr.val, priv->regs + DW_SPI_DR); + }
external_cs_manage(slave->dev, false); dw_write(priv, DW_SPI_SER, 1 << spi_chip_select(slave->dev)); @@ -756,6 +837,37 @@ static int dw_spi_exec_op(struct spi_slave *slave, const struct spi_mem_op *op) return ret; }
+bool dw_spi_supports_op(struct spi_slave *slave, const struct spi_mem_op *op) +{ + struct dw_spi_priv *priv = dev_get_priv(slave->dev->parent); + + if (!spi_mem_default_supports_op(slave, op)) + return false; + + /* + * Everything before the data must fit in the fifo. + * In EEPROM mode we also need to fit the dummy. + */ + if (1 + op->addr.nbytes + + (op->data.buswidth == 1 ? op->dummy.nbytes : 0) > priv->fifo_len) + return false; + + /* We only support 1_1_X, 1_X_X, and X_X_X formats */ + if (op->cmd.buswidth == 1 && + (!op->addr.nbytes || op->addr.buswidth == 1)) + return true; + + if (op->cmd.buswidth == 1 && + (!op->addr.nbytes || op->addr.buswidth == op->data.buswidth)) + return true; + + if (op->cmd.buswidth == op->data.buswidth && + (!op->addr.nbytes || op->addr.buswidth == op->data.buswidth)) + return true; + + return false; +} + /* The size of ctrl1 limits data transfers to 64K */ static int dw_spi_adjust_op_size(struct spi_slave *slave, struct spi_mem_op *op) { @@ -766,6 +878,7 @@ static int dw_spi_adjust_op_size(struct spi_slave *slave, struct spi_mem_op *op)
static const struct spi_controller_mem_ops dw_spi_mem_ops = { .exec_op = dw_spi_exec_op, + .supports_op = dw_spi_supports_op, .adjust_op_size = dw_spi_adjust_op_size, };