[PATCH v1 05/11] spi: dw: Introduce enhanced single/dual/quad/octal spi

[Changhuang Liang <changhuang.liang@starfivetech.com>]

From: Sudip Mukherjee <sudip.mukherjee@sifive.com>

If the spi transfer is using enhanced single/dual/quad/octal spi mode,
then we need to update the SPI_CTRLR0 register. The SPI_CTRLR0 register
will be updated in dw_spi_update_config() via the values in
dw_spi_enh_cfg.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com>
Co-developed-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
---
 drivers/spi/spi-dw-core.c | 91 +++++++++++++++++++++++++++++++++++++--
 drivers/spi/spi-dw.h      |  9 ++++
 2 files changed, 97 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 0d7c88d2c74d..9f3ee1d78c05 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -815,6 +815,89 @@ static int dw_spi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
 	return ret;
 }
 
+static void dw_spi_init_enh_mem_buf(struct dw_spi *dws, const struct spi_mem_op *op)
+{
+	dws->n_bytes = 1;
+	if (op->data.dir == SPI_MEM_DATA_IN) {
+		dws->rx = op->data.buf.in;
+		dws->rx_len = op->data.nbytes;
+		dws->tx = NULL;
+		dws->tx_len = 0;
+	} else if (op->data.dir == SPI_MEM_DATA_OUT) {
+		dws->tx_len = op->data.nbytes;
+		dws->tx = (void *)op->data.buf.out;
+		dws->rx = NULL;
+		dws->rx_len = 0;
+	} else {
+		dws->rx = NULL;
+		dws->rx_len = 0;
+		dws->tx = NULL;
+		dws->tx_len = 0;
+	}
+}
+
+static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+	struct spi_controller *ctlr = mem->spi->controller;
+	struct dw_spi *dws = spi_controller_get_devdata(ctlr);
+	struct dw_spi_enh_cfg enh_cfg;
+	struct dw_spi_cfg cfg;
+
+	switch (op->data.buswidth) {
+	case 0:
+	case 1:
+		cfg.spi_frf = DW_SPI_CTRLR0_SPI_FRF_STD_SPI;
+		break;
+	case 2:
+		cfg.spi_frf = DW_SPI_CTRLR0_SPI_FRF_DUAL_SPI;
+		break;
+	case 4:
+		cfg.spi_frf = DW_SPI_CTRLR0_SPI_FRF_QUAD_SPI;
+		break;
+	case 8:
+		cfg.spi_frf = DW_SPI_CTRLR0_SPI_FRF_OCT_SPI;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	dw_spi_init_enh_mem_buf(dws, op);
+
+	cfg.dfs = 8;
+	cfg.freq = clamp(mem->spi->max_speed_hz, 0U, dws->max_mem_freq);
+	cfg.ndf = op->data.nbytes;
+	if (op->data.dir == SPI_MEM_DATA_IN)
+		cfg.tmode = DW_SPI_CTRLR0_TMOD_RO;
+	else
+		cfg.tmode = DW_SPI_CTRLR0_TMOD_TO;
+
+	if (op->data.buswidth == op->addr.buswidth &&
+	    op->data.buswidth == op->cmd.buswidth)
+		enh_cfg.trans_t = DW_SPI_ENH_CTRLR0_TRANS_TYPE_TT2;
+	else if (op->data.buswidth == op->addr.buswidth)
+		enh_cfg.trans_t = DW_SPI_ENH_CTRLR0_TRANS_TYPE_TT1;
+	else
+		enh_cfg.trans_t = DW_SPI_ENH_CTRLR0_TRANS_TYPE_TT0;
+
+	enh_cfg.addr_l = op->addr.nbytes << 1;
+	if (op->cmd.nbytes == 2)
+		enh_cfg.inst_l = DW_SPI_ENH_CTRLR0_INST_L_INST_L16;
+	else if (op->cmd.nbytes == 1)
+		enh_cfg.inst_l = DW_SPI_ENH_CTRLR0_INST_L_INST_L8;
+	else
+		enh_cfg.inst_l = DW_SPI_ENH_CTRLR0_INST_L_INST_L0;
+
+	enh_cfg.wait_c = (op->dummy.nbytes * (BITS_PER_BYTE / op->dummy.buswidth));
+
+	dw_spi_enable_chip(dws, 0);
+
+	dw_spi_update_config(dws, mem->spi, &cfg, &enh_cfg);
+
+	dw_spi_enable_chip(dws, 1);
+
+	return 0;
+}
+
 /*
  * Initialize the default memory operations if a glue layer hasn't specified
  * custom ones. Direct mapping operations will be preserved anyway since DW SPI
@@ -829,11 +912,13 @@ static void dw_spi_init_mem_ops(struct dw_spi *dws)
 	if (!dws->mem_ops.exec_op && !(dws->caps & DW_SPI_CAP_CS_OVERRIDE) &&
 	    !dws->set_cs) {
 		dws->mem_ops.adjust_op_size = dw_spi_adjust_mem_op_size;
-		if (dws->caps & DW_SPI_CAP_EMODE)
+		if (dws->caps & DW_SPI_CAP_EMODE) {
+			dws->mem_ops.exec_op = dw_spi_exec_enh_mem_op;
 			dws->mem_ops.supports_op = dw_spi_supports_enh_mem_op;
-		else
+		} else {
+			dws->mem_ops.exec_op = dw_spi_exec_mem_op;
 			dws->mem_ops.supports_op = dw_spi_supports_mem_op;
-		dws->mem_ops.exec_op = dw_spi_exec_mem_op;
+		}
 		if (!dws->max_mem_freq)
 			dws->max_mem_freq = dws->max_freq;
 	}
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
index 81a433ab759b..2dae81c15423 100644
--- a/drivers/spi/spi-dw.h
+++ b/drivers/spi/spi-dw.h
@@ -102,6 +102,9 @@
 #define DW_HSSI_CTRLR0_SPI_FRF_MASK		GENMASK(23, 22)
 #define DW_PSSI_CTRLR0_SPI_FRF_MASK		GENMASK(22, 21)
 #define DW_SPI_CTRLR0_SPI_FRF_STD_SPI		0x0
+#define DW_SPI_CTRLR0_SPI_FRF_DUAL_SPI		0x1
+#define DW_SPI_CTRLR0_SPI_FRF_QUAD_SPI		0x2
+#define DW_SPI_CTRLR0_SPI_FRF_OCT_SPI		0x3
 
 /* Bit fields in CTRLR1 */
 #define DW_SPI_NDF_MASK				GENMASK(15, 0)
@@ -133,7 +136,13 @@
 #define DW_SPI_ENH_CTRLR0_CLK_STRETCH_EN	BIT(30)
 #define DW_SPI_ENH_CTRLR0_WAIT_CYCLE_MASK	GENMASK(15, 11)
 #define DW_SPI_ENH_CTRLR0_INST_L_MASK		GENMASK(9, 8)
+#define DW_SPI_ENH_CTRLR0_INST_L_INST_L0	0x0
+#define DW_SPI_ENH_CTRLR0_INST_L_INST_L8	0x2
+#define DW_SPI_ENH_CTRLR0_INST_L_INST_L16	0x3
 #define DW_SPI_ENH_CTRLR0_ADDR_L_MASK		GENMASK(5, 2)
+#define DW_SPI_ENH_CTRLR0_TRANS_TYPE_TT0	0x0
+#define DW_SPI_ENH_CTRLR0_TRANS_TYPE_TT1	0x1
+#define DW_SPI_ENH_CTRLR0_TRANS_TYPE_TT2	0x2
 #define DW_SPI_ENH_CTRLR0_TRANS_TYPE_MASK	GENMASK(1, 0)
 
 /* Mem/DMA operations helpers */
-- 
2.25.1