spi: bcm-qspi: Remove hardcoded settings and spi-nor.h dependency

The newly added broadcom qspi driver in drivers/spi produces a build
warning when CONFIG_MTD is disabled:
include/linux/mtd/cfi.h:76:2: #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work. [-Werror=cpp]

There has been discussion on this in the link provided below. This fix in
SPI controller drivers implementing the ->spi_flash_read handler, now uses the
settings provided inside the 'struct spi_flash_read_message' parameter instead
of hardcoding them. Made changes to bcm_qspi_bspi_set_flex_mode() to set the BSPI
controller using the passed msg structure and remove the need to include
<linux/mtd/spi-nor.h> file by removing all use of SPINOR_OP_READ* macros.

Fixes: 4e3b2d236fe0 ("spi: bcm-qspi: Add BSPI spi-nor flash controller driver")
Link: https://patchwork.kernel.org/patch/9624585/
Signed-off-by: Kamal Dasu <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 b19722b..6ef6c44 100644 (file)
--- a/drivers/spi/spi-bcm-qspi.c
+++ b/drivers/spi/spi-bcm-qspi.c
@@ -25,7 +25,6 @@
 #include <linux/ioport.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/mtd/spi-nor.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
@@ -349,76 +348,60 @@ static void bcm_qspi_bspi_set_xfer_params(struct bcm_qspi *qspi, u8 cmd_byte,
        bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, flex_mode);
 }
 
-static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi, int width,
-                                      int addrlen, int hp)
+static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi,
+                                      struct spi_flash_read_message *msg,
+                                      int hp)
 {
        int bpc = 0, bpp = 0;
-       u8 command = SPINOR_OP_READ_FAST;
-       int flex_mode = 1, rv = 0;
-       bool spans_4byte = false;
+       u8 command = msg->read_opcode;
+       int width  = msg->data_nbits ? msg->data_nbits : SPI_NBITS_SINGLE;
+       int addrlen = msg->addr_width;
+       int addr_nbits = msg->addr_nbits ? msg->addr_nbits : SPI_NBITS_SINGLE;
+       int flex_mode = 1;
 
        dev_dbg(&qspi->pdev->dev, "set flex mode w %x addrlen %x hp %d\n",
                width, addrlen, hp);
 
-       if (addrlen == BSPI_ADDRLEN_4BYTES) {
+       if (addrlen == BSPI_ADDRLEN_4BYTES)
                bpp = BSPI_BPP_ADDR_SELECT_MASK;
-               spans_4byte = true;
-       }
 
-       bpp |= 8;
+       bpp |= msg->dummy_bytes * (8/addr_nbits);
 
        switch (width) {
        case SPI_NBITS_SINGLE:
                if (addrlen == BSPI_ADDRLEN_3BYTES)
                        /* default mode, does not need flex_cmd */
                        flex_mode = 0;
-               else
-                       command = SPINOR_OP_READ_FAST_4B;
                break;
        case SPI_NBITS_DUAL:
                bpc = 0x00000001;
                if (hp) {
                        bpc |= 0x00010100; /* address and mode are 2-bit */
                        bpp = BSPI_BPP_MODE_SELECT_MASK;
-                       command = OPCODE_DIOR;
-                       if (spans_4byte)
-                               command = OPCODE_DIOR_4B;
-               } else {
-                       command = SPINOR_OP_READ_1_1_2;
-                       if (spans_4byte)
-                               command = SPINOR_OP_READ_1_1_2_4B;
                }
                break;
        case SPI_NBITS_QUAD:
                bpc = 0x00000002;
                if (hp) {
                        bpc |= 0x00020200; /* address and mode are 4-bit */
-                       bpp = 4; /* dummy cycles */
-                       bpp |= BSPI_BPP_ADDR_SELECT_MASK;
-                       command = OPCODE_QIOR;
-                       if (spans_4byte)
-                               command = OPCODE_QIOR_4B;
-               } else {
-                       command = SPINOR_OP_READ_1_1_4;
-                       if (spans_4byte)
-                               command = SPINOR_OP_READ_1_1_4_4B;
+                       bpp |= BSPI_BPP_MODE_SELECT_MASK;
                }
                break;
        default:
-               rv = -EINVAL;
-               break;
+               return -EINVAL;
        }
 
-       if (rv == 0)
-               bcm_qspi_bspi_set_xfer_params(qspi, command, bpp, bpc,
-                                             flex_mode);
+       bcm_qspi_bspi_set_xfer_params(qspi, command, bpp, bpc, flex_mode);
 
-       return rv;
+       return 0;
 }
 
-static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi, int width,
-                                     int addrlen, int hp)
+static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi,
+                                     struct spi_flash_read_message *msg,
+                                     int hp)
 {
+       int width = msg->data_nbits ? msg->data_nbits : SPI_NBITS_SINGLE;
+       int addrlen = msg->addr_width;
        u32 data = bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL);
 
        dev_dbg(&qspi->pdev->dev, "set override mode w %x addrlen %x hp %d\n",
@@ -430,7 +413,6 @@ static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi, int width,
                data &= ~(BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD |
                          BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL);
                break;
-
        case SPI_NBITS_QUAD:
                /* clear dual mode and set quad mode */
                data &= ~BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL;
@@ -455,15 +437,17 @@ static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi, int width,
        /* set the override mode */
        data |= BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE;
        bcm_qspi_write(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL, data);
-       bcm_qspi_bspi_set_xfer_params(qspi, SPINOR_OP_READ_FAST, 0, 0, 0);
+       bcm_qspi_bspi_set_xfer_params(qspi, msg->read_opcode, 0, 0, 0);
 
        return 0;
 }
 
 static int bcm_qspi_bspi_set_mode(struct bcm_qspi *qspi,
-                                 int width, int addrlen, int hp)
+                                 struct spi_flash_read_message *msg, int hp)
 {
        int error = 0;
+       int width = msg->data_nbits ? msg->data_nbits : SPI_NBITS_SINGLE;
+       int addrlen = msg->addr_width;
 
        /* default mode */
        qspi->xfer_mode.flex_mode = true;
@@ -475,23 +459,13 @@ static int bcm_qspi_bspi_set_mode(struct bcm_qspi *qspi,
                mask = BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE;
                if (val & mask || qspi->s3_strap_override_ctrl & mask) {
                        qspi->xfer_mode.flex_mode = false;
-                       bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE,
-                                      0);
-
-                       if ((val | qspi->s3_strap_override_ctrl) &
-                           BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL)
-                               width = SPI_NBITS_DUAL;
-                       else if ((val |  qspi->s3_strap_override_ctrl) &
-                                BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD)
-                               width = SPI_NBITS_QUAD;
-
-                       error = bcm_qspi_bspi_set_override(qspi, width, addrlen,
-                                                          hp);
+                       bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, 0);
+                       error = bcm_qspi_bspi_set_override(qspi, msg, hp);
                }
        }
 
        if (qspi->xfer_mode.flex_mode)
-               error = bcm_qspi_bspi_set_flex_mode(qspi, width, addrlen, hp);
+               error = bcm_qspi_bspi_set_flex_mode(qspi, msg, hp);
 
        if (error) {
                dev_warn(&qspi->pdev->dev,
@@ -981,7 +955,7 @@ static int bcm_qspi_flash_read(struct spi_device *spi,
        struct bcm_qspi *qspi = spi_master_get_devdata(spi->master);
        int ret = 0;
        bool mspi_read = false;
-       u32 io_width, addrlen, addr, len;
+       u32 addr, len;
        u_char *buf;
 
        buf = msg->buf;
@@ -1010,9 +984,7 @@ static int bcm_qspi_flash_read(struct spi_device *spi,
        if (mspi_read)
                return bcm_qspi_mspi_flash_read(spi, msg);
 
-       io_width = msg->data_nbits ? msg->data_nbits : SPI_NBITS_SINGLE;
-       addrlen = msg->addr_width;
-       ret = bcm_qspi_bspi_set_mode(qspi, io_width, addrlen, -1);
+       ret = bcm_qspi_bspi_set_mode(qspi, msg, -1);
 
        if (!ret)
                ret = bcm_qspi_bspi_flash_read(spi, msg);
@@ -1422,6 +1394,11 @@ static int __maybe_unused bcm_qspi_suspend(struct device *dev)
 {
        struct bcm_qspi *qspi = dev_get_drvdata(dev);
 
+       /* store the override strap value */
+       if (!bcm_qspi_bspi_ver_three(qspi))
+               qspi->s3_strap_override_ctrl =
+                       bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL);
+
        spi_master_suspend(qspi->master);
        clk_disable(qspi->clk);
        bcm_qspi_hw_uninit(qspi);