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

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Message-ID: <20250313183440.261872-6-Raju.Rangoju@amd.com>
Date: Fri, 14 Mar 2025 00:04:35 +0530
From: Raju Rangoju <Raju.Rangoju@....com>
To: <broonie@...nel.org>, <linux-spi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <Raju.Rangoju@....com>, <krishnamoorthi.m@....com>,
	<akshata.mukundshetty@....com>
Subject: [PATCH 05/10] spi: espi_amd: Add eSPI set IO mode IOCTL command

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@....com>
Signed-off-by: Krishnamoorthi M <krishnamoorthi.m@....com>
Co-developed-by: Akshata MukundShetty <akshata.mukundshetty@....com>
Signed-off-by: Akshata MukundShetty <akshata.mukundshetty@....com>
Signed-off-by: Raju Rangoju <Raju.Rangoju@....com>
---
 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