spi: bcm-qspi: add support for 3-wire mode for half duplex transfer

This change configures the MSPI controller to use 3-wire interface when
a slave device devictree nodes indicates this via the optional property.

Signed-off-by: Kamal Dasu <kdasu@broadcom.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20211008203603.40915-4-kdasu.kdev@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c
index c7c467f..6cb2019 100644 (file)
--- a/drivers/spi/spi-bcm-qspi.c
+++ b/drivers/spi/spi-bcm-qspi.c
@@ -103,6 +103,7 @@
 #define MSPI_MASTER_BIT                        BIT(7)
 
 #define MSPI_NUM_CDRAM                         16
+#define MSPI_CDRAM_OUTP                                BIT(8)
 #define MSPI_CDRAM_CONT_BIT                    BIT(7)
 #define MSPI_CDRAM_BITSE_BIT                   BIT(6)
 #define MSPI_CDRAM_DT_BIT                      BIT(5)
@@ -122,6 +123,8 @@
 #define MSPI_SPCR3_DAM_8BYTE                   0
 #define MSPI_SPCR3_DAM_16BYTE                  (BIT(2) | BIT(4))
 #define MSPI_SPCR3_DAM_32BYTE                  (BIT(3) | BIT(5))
+#define MSPI_SPCR3_HALFDUPLEX                  BIT(6)
+#define MSPI_SPCR3_HDOUTTYPE                   BIT(7)
 #define MSPI_SPCR3_DATA_REG_SZ                 BIT(8)
 #define MSPI_SPCR3_CPHARX                      BIT(9)
 
@@ -613,6 +616,9 @@ static void bcm_qspi_hw_set_parms(struct bcm_qspi *qspi,
                /* enable fastbr */
                spcr |= MSPI_SPCR3_FASTBR;
 
+               if (xp->mode & SPI_3WIRE)
+                       spcr |= MSPI_SPCR3_HALFDUPLEX |  MSPI_SPCR3_HDOUTTYPE;
+
                if (bcm_qspi_has_sysclk_108(qspi)) {
                        /* SYSCLK_108 */
                        spcr |= MSPI_SPCR3_SYSCLKSEL_108;
@@ -940,6 +946,10 @@ static int write_to_hw(struct bcm_qspi *qspi, struct spi_device *spi)
                mspi_cdram |= ((tp.trans->bits_per_word <= 8) ? 0 :
                               MSPI_CDRAM_BITSE_BIT);
 
+               /* set 3wrire halfduplex mode data from master to slave */
+               if ((spi->mode & SPI_3WIRE) && tp.trans->tx_buf)
+                       mspi_cdram |= MSPI_CDRAM_OUTP;
+
                if (has_bspi(qspi))
                        mspi_cdram &= ~1;
                else
@@ -1480,7 +1490,8 @@ int bcm_qspi_probe(struct platform_device *pdev,
        qspi->master = master;
 
        master->bus_num = -1;
-       master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_RX_DUAL | SPI_RX_QUAD;
+       master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_RX_DUAL | SPI_RX_QUAD |
+                               SPI_3WIRE;
        master->setup = bcm_qspi_setup;
        master->transfer_one = bcm_qspi_transfer_one;
        master->mem_ops = &bcm_qspi_mem_ops;