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Message-ID: <20250313183440.261872-4-Raju.Rangoju@amd.com>
Date: Fri, 14 Mar 2025 00:04:33 +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 03/10] spi: espi_amd: Add eSPI get config IOCTL command
This patch introduces an IOCTL command to retrieve the configuration of
the eSPI controller and eSPI slave0. The configuration parameters include
the frequency, channel, and IO mode.
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 | 69 ++++++++++++++++++++++++++++++++++++++
drivers/spi/espi-amd.h | 1 +
2 files changed, 70 insertions(+)
diff --git a/drivers/spi/espi-amd-dev.c b/drivers/spi/espi-amd-dev.c
index 5f25ad2b1eef..79224f4f86fa 100644
--- a/drivers/spi/espi-amd-dev.c
+++ b/drivers/spi/espi-amd-dev.c
@@ -100,6 +100,72 @@ static int amd_espi_ioctl_set_conf(struct amd_espi *amd_espi, unsigned long arg)
return ret;
}
+static int amd_espi_ioctl_get_conf(struct amd_espi *amd_espi, unsigned long arg)
+{
+ u32 op_freq, io_mode, slave_conf;
+ struct config *config;
+ int ret;
+
+ config = kzalloc(sizeof(*config), GFP_KERNEL);
+ if (!config)
+ return -ENOMEM;
+
+ ret = amd_espi_get_general_config(amd_espi, &slave_conf);
+ if (ret != CB_SUCCESS)
+ goto get_config_free;
+
+ /* Get IO mode configuration */
+ io_mode = (slave_conf & GENMASK(27, 26)) >> ESPI_SLAVE_IO_MODE_SEL_SHIFT;
+ switch (io_mode) {
+ case IO_MODE_SINGLE:
+ case IO_MODE_DUAL:
+ case IO_MODE_QUAD:
+ config->io_mode = io_mode;
+ break;
+ default:
+ dev_err(amd_espi->dev, "Invalid IO mode\n");
+ ret = -EOPNOTSUPP;
+ goto get_config_free;
+ }
+
+ /* Get operating frequency configuration */
+ op_freq = (slave_conf & GENMASK(22, 20)) >> ESPI_SLAVE_OP_FREQ_SEL_SHIFT;
+ switch (op_freq) {
+ case SLAVE_OP_FREQ_16:
+ case SLAVE_OP_FREQ_33:
+ case SLAVE_OP_FREQ_66:
+ config->op_freq = op_freq;
+ break;
+ default:
+ dev_err(amd_espi->dev, "Invalid operating frequency\n");
+ ret = -EOPNOTSUPP;
+ goto get_config_free;
+ }
+
+ /* Get channel configuration */
+ ret = amd_espi_get_channel_config(amd_espi);
+ config->channel_mode = 0;
+
+ if (ret == -EOPNOTSUPP) {
+ config->channel_mode = CHAN_NOT_ENABLED;
+ } else {
+ if (ret & CHANNEL_MODE_PC)
+ config->channel_mode |= CHANNEL_MODE_PC;
+ if (ret & CHANNEL_MODE_VW)
+ config->channel_mode |= CHANNEL_MODE_VW;
+ }
+
+ if (copy_to_user((void __user *)arg, config, sizeof(struct config))) {
+ ret = -EFAULT;
+ goto get_config_free;
+ }
+ ret = 0;
+
+get_config_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;
@@ -113,6 +179,9 @@ static long amd_espi_ioctl(struct file *filp, unsigned int cmd, unsigned long ar
case ESPI_SET_CONFIG:
ret = amd_espi_ioctl_set_conf(amd_espi, arg);
break;
+ case ESPI_GET_CONFIG:
+ ret = amd_espi_ioctl_get_conf(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 1de53426059b..bc15f7417c37 100644
--- a/drivers/spi/espi-amd.h
+++ b/drivers/spi/espi-amd.h
@@ -141,6 +141,7 @@
/* IOCTL calls */
#define ESPI_MAGIC_NUMBER 'i'
#define ESPI_SET_CONFIG _IOW(ESPI_MAGIC_NUMBER, 0x1, struct config)
+#define ESPI_GET_CONFIG _IOR(ESPI_MAGIC_NUMBER, 0x2, struct config)
/*
* enum amd_espi_versions - eSPI controller versions
--
2.34.1
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