+ if (!rc && (flags & (SCOM_RESET_PIB | SCOM_RESET_INTF)))
+ rc = fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG,
&dummy,
+ sizeof(uint32_t));
+ return rc;
+}
+
+static int scom_check(struct scom_device *scom, void __user *argp)
+{
+ /* Still need to find out how to get "protected" */
+ return put_user(SCOM_CHECK_SUPPORTED, (__u32 __user *)argp);
+}
+
+static long scom_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct miscdevice *mdev = file->private_data;
+ struct scom_device *scom = to_scom_dev(mdev);
+ void __user *argp = (void __user *)arg;
+ int rc = -ENOTTY;
+
+ mutex_lock(&scom->lock);
+ switch(cmd) {
+ case FSI_SCOM_CHECK:
+ rc = scom_check(scom, argp);
+ break;
+ case FSI_SCOM_READ:
+ rc = scom_raw_read(scom, argp);
+ break;
+ case FSI_SCOM_WRITE:
+ rc = scom_raw_write(scom, argp);
+ break;
+ case FSI_SCOM_RESET:
+ rc = scom_reset(scom, argp);
+ break;
+ }
+ mutex_unlock(&scom->lock);
+ return rc;
+}
+
static const struct file_operations scom_fops = {
- .owner = THIS_MODULE,
- .llseek = scom_llseek,
- .read = scom_read,
- .write = scom_write,
+ .owner = THIS_MODULE,
+ .llseek = scom_llseek,
+ .read = scom_read,
+ .write = scom_write,
+ .unlocked_ioctl = scom_ioctl,
};
static int scom_probe(struct device *dev)
diff --git a/include/uapi/linux/fsi.h b/include/uapi/linux/fsi.h
new file mode 100644
index 000000000000..6008d93f2e48
--- /dev/null
+++ b/include/uapi/linux/fsi.h
@@ -0,0 +1,56 @@
+#ifndef _UAPI_LINUX_FSI_H
+#define _UAPI_LINUX_FSI_H
+
+#include <linux/ioctl.h>
+
+/*
+ * /dev/scom "raw" ioctl interface
+ *
+ * The driver supports a high level "read/write" interface which
+ * handles retries and converts the status to Linux error codes,
+ * however low level tools an debugger need to access the "raw"
+ * HW status information and interpret it themselves, so this
+ * ioctl interface is also provided for their use case.
+ */
+
+/* Structure for SCOM read/write */
+struct scom_access {
+ __u64 addr; /* SCOM address, supports indirect */
+ __u64 data; /* SCOM data (in for write, out for read) */
+ __u64 mask; /* Data mask for writes */
+ __u32 intf_errors; /* Interface error flags */
+#define SCOM_INTF_ERR_PARITY 0x00000001 /* Parity error */
+#define SCOM_INTF_ERR_PROTECTION 0x00000002 /* Blocked by secure boot */
+#define SCOM_INTF_ERR_ABORT 0x00000004 /* PIB reset during access */
+#define SCOM_INTF_ERR_UNKNOWN 0x80000000 /* Unknown error */
+ /*
+ * Note: Any other bit set in intf_errors need to be considered as an
+ * error. Future implementations may define new error conditions. The
+ * pib_status below is only valid if intf_errors is 0.
+ */
+ __u8 pib_status; /* 3-bit PIB status */
+#define SCOM_PIB_SUCCESS 0 /* Access successful */
+#define SCOM_PIB_BLOCKED 1 /* PIB blocked, pls retry */
+#define SCOM_PIB_OFFLINE 2 /* Chiplet offline */
+#define SCOM_PIB_PARTIAL 3 /* Partial good */
+#define SCOM_PIB_BAD_ADDR 4 /* Invalid address */
+#define SCOM_PIB_CLK_ERR 5 /* Clock error */
+#define SCOM_PIB_PARITY_ERR 6 /* Parity error on the PIB bus */
+#define SCOM_PIB_TIMEOUT 7 /* Bus timeout */
+ __u8 pad;
+};
+
+/* Flags for SCOM check */
+#define SCOM_CHECK_SUPPORTED 0x00000001 /* Interface supported */
+#define SCOM_CHECK_PROTECTED 0x00000002 /* Interface blocked by secure
boot */
+
+/* Flags for SCOM reset */
+#define SCOM_RESET_INTF 0x00000001 /* Reset interface */
+#define SCOM_RESET_PIB 0x00000002 /* Reset PIB */
+
+#define FSI_SCOM_CHECK _IOR('s', 0x00, __u32)
+#define FSI_SCOM_READ _IOWR('s', 0x01, struct scom_access)
+#define FSI_SCOM_WRITE _IOWR('s', 0x02, struct scom_access)
+#define FSI_SCOM_RESET _IOW('s', 0x03, __u32)
+
+#endif /* _UAPI_LINUX_FSI_H */
