[PATCH 05/10] spi: espi_amd: Add eSPI set IO mode IOCTL command

[Raju Rangoju <Raju.Rangoju@xxxxxxx>]

This patch introduces an IOCTL command to allow users to dynamically
configure the supported IO modes such as single, dual and quad modes.

Co-developed-by: Krishnamoorthi M <krishnamoorthi.m@xxxxxxx>
Signed-off-by: Krishnamoorthi M <krishnamoorthi.m@xxxxxxx>
Co-developed-by: Akshata MukundShetty <akshata.mukundshetty@xxxxxxx>
Signed-off-by: Akshata MukundShetty <akshata.mukundshetty@xxxxxxx>
Signed-off-by: Raju Rangoju <Raju.Rangoju@xxxxxxx>
---
 drivers/spi/espi-amd-dev.c | 40 ++++++++++++++++++++++++++++++++++++++
 drivers/spi/espi-amd.h     |  1 +
 2 files changed, 41 insertions(+)

diff --git a/drivers/spi/espi-amd-dev.c b/drivers/spi/espi-amd-dev.c
index ba2becdec8e6..821cc0486657 100644
--- a/drivers/spi/espi-amd-dev.c
+++ b/drivers/spi/espi-amd-dev.c
@@ -166,6 +166,43 @@ static int amd_espi_ioctl_get_conf(struct amd_espi *amd_espi, unsigned long arg)
 	return ret;
 }
 
+static int amd_espi_ioctl_set_io_mode(struct amd_espi *amd_espi, unsigned long arg)
+{
+	u32 ctrlr_config, slave_config;
+	struct config *config;
+	int ret;
+
+	config = kzalloc(sizeof(*config), GFP_KERNEL);
+	if (!config)
+		return -ENOMEM;
+
+	if (copy_from_user(config, (void __user *)arg, sizeof(struct config))) {
+		ret = -EFAULT;
+		goto set_io_mode_free;
+	}
+
+	ctrlr_config = readl(ESPI_BASE + AMD_ESPI_SLAVE0_CONFIG_REG);
+
+	ret = amd_espi_get_general_config(amd_espi, &slave_config);
+	if (ret != CB_SUCCESS)
+		goto set_io_mode_free;
+
+	ret = amd_espi_set_iomode(amd_espi, &slave_config, &ctrlr_config, config->io_mode);
+	if (ret != CB_SUCCESS)
+		goto set_io_mode_free;
+
+	ret = amd_espi_set_config(amd_espi, slave_config, ESPI_SLAVE_GENERAL_CAPS_CFG);
+	if (ret != CB_SUCCESS) {
+		dev_err(amd_espi->dev, "Set IO mode failed\n");
+		goto set_io_mode_free;
+	}
+	writel(ctrlr_config, (ESPI_BASE + AMD_ESPI_SLAVE0_CONFIG_REG));
+
+set_io_mode_free:
+	kfree(config);
+	return ret;
+}
+
 static long amd_espi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct amd_espi *amd_espi = filp->private_data;
@@ -187,6 +224,9 @@ static long amd_espi_ioctl(struct file *filp, unsigned int cmd, unsigned long ar
 		if (ret != CB_SUCCESS)
 			dev_err(amd_espi->dev, "In-band reset failed!\n");
 		break;
+	case ESPI_SET_IO_MODE:
+		ret = amd_espi_ioctl_set_io_mode(amd_espi, arg);
+		break;
 	default:
 		dev_err(amd_espi->dev, "ESPI command not found, returning error\n");
 		ret = -EINVAL;
diff --git a/drivers/spi/espi-amd.h b/drivers/spi/espi-amd.h
index 3c6e9b92c08d..f1185f877a05 100644
--- a/drivers/spi/espi-amd.h
+++ b/drivers/spi/espi-amd.h
@@ -143,6 +143,7 @@
 #define ESPI_SET_CONFIG              _IOW(ESPI_MAGIC_NUMBER, 0x1, struct config)
 #define ESPI_GET_CONFIG              _IOR(ESPI_MAGIC_NUMBER, 0x2, struct config)
 #define ESPI_INBAND_RESET            _IO(ESPI_MAGIC_NUMBER, 0x3)
+#define ESPI_SET_IO_MODE             _IOW(ESPI_MAGIC_NUMBER, 0x4, struct config)
 
 /*
  * enum amd_espi_versions - eSPI controller versions
-- 
2.34.1