[PATCH 05/10] spi: espi_amd: Add eSPI set IO mode IOCTL command
From: Raju Rangoju
Date: Thu Mar 13 2025 - 14:36:29 EST
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