struct list_head link;
struct fsi_device *fsi_dev;
struct miscdevice mdev;
+ struct mutex lock;
char name[32];
int idx;
};
int rc;
uint32_t data;
+ mutex_lock(&scom_dev->lock);
+
data = cpu_to_be32((value >> 32) & 0xffffffff);
rc = fsi_device_write(scom_dev->fsi_dev, SCOM_DATA0_REG, &data,
sizeof(uint32_t));
if (rc)
- return rc;
+ goto bail;
data = cpu_to_be32(value & 0xffffffff);
rc = fsi_device_write(scom_dev->fsi_dev, SCOM_DATA1_REG, &data,
sizeof(uint32_t));
if (rc)
- return rc;
+ goto bail;
data = cpu_to_be32(SCOM_WRITE_CMD | addr);
- return fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
+ rc = fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
sizeof(uint32_t));
+ bail:
+ mutex_unlock(&scom_dev->lock);
+ return rc;
}
static int get_scom(struct scom_device *scom_dev, uint64_t *value,
uint32_t result, data;
int rc;
+
+ mutex_lock(&scom_dev->lock);
*value = 0ULL;
data = cpu_to_be32(addr);
rc = fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
sizeof(uint32_t));
if (rc)
- return rc;
+ goto bail;
rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA0_REG, &result,
sizeof(uint32_t));
if (rc)
- return rc;
+ goto bail;
*value |= (uint64_t)cpu_to_be32(result) << 32;
rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA1_REG, &result,
sizeof(uint32_t));
if (rc)
- return rc;
+ goto bail;
*value |= cpu_to_be32(result);
- return 0;
+ bail:
+ mutex_unlock(&scom_dev->lock);
+ return rc;
}
static ssize_t scom_read(struct file *filep, char __user *buf, size_t len,
if (!scom)
return -ENOMEM;
+ mutex_init(&scom->lock);
scom->idx = ida_simple_get(&scom_ida, 1, INT_MAX, GFP_KERNEL);
snprintf(scom->name, sizeof(scom->name), "scom%d", scom->idx);
scom->fsi_dev = fsi_dev;