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authorSimon Glass <sjg@chromium.org>2014-09-04 16:27:26 -0600
committerSimon Glass <sjg@chromium.org>2014-09-10 13:00:00 -0600
commit57d92753d4cada5c314a7d6bcfe7ad79b00c2eb8 (patch)
tree33a0908febf5da246e703633fcb51622c64db7e3 /include
parent1f359e3611c55d9cfae88dafce04db1833033bd0 (diff)
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dm: Add a uclass for serial devices
Serial devices support simple byte input/output and a few operations to find out whether data is available. Add a basic uclass for serial devices to be used by drivers that are converted to driver model. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include')
-rw-r--r--include/dm/uclass-id.h1
-rw-r--r--include/serial.h92
2 files changed, 93 insertions, 0 deletions
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index dd95fca..7f0e37b 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -21,6 +21,7 @@ enum uclass_id {
/* U-Boot uclasses start here */
UCLASS_GPIO, /* Bank of general-purpose I/O pins */
+ UCLASS_SERIAL, /* Serial UART */
UCLASS_COUNT,
UCLASS_INVALID = -1,
diff --git a/include/serial.h b/include/serial.h
index d232d47..8f574e4 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -72,4 +72,96 @@ extern int write_port(struct stdio_dev *port, char *buf);
extern int read_port(struct stdio_dev *port, char *buf, int size);
#endif
+struct udevice;
+
+/**
+ * struct struct dm_serial_ops - Driver model serial operations
+ *
+ * The uclass interface is implemented by all serial devices which use
+ * driver model.
+ */
+struct dm_serial_ops {
+ /**
+ * setbrg() - Set up the baud rate generator
+ *
+ * Adjust baud rate divisors to set up a new baud rate for this
+ * device. Not all devices will support all rates. If the rate
+ * cannot be supported, the driver is free to select the nearest
+ * available rate. or return -EINVAL if this is not possible.
+ *
+ * @dev: Device pointer
+ * @baudrate: New baud rate to use
+ * @return 0 if OK, -ve on error
+ */
+ int (*setbrg)(struct udevice *dev, int baudrate);
+ /**
+ * getc() - Read a character and return it
+ *
+ * If no character is available, this should return -EAGAIN without
+ * waiting.
+ *
+ * @dev: Device pointer
+ * @return character (0..255), -ve on error
+ */
+ int (*getc)(struct udevice *dev);
+ /**
+ * putc() - Write a character
+ *
+ * @dev: Device pointer
+ * @ch: character to write
+ * @return 0 if OK, -ve on error
+ */
+ int (*putc)(struct udevice *dev, const char ch);
+ /**
+ * pending() - Check if input/output characters are waiting
+ *
+ * This can be used to return an indication of the number of waiting
+ * characters if the driver knows this (e.g. by looking at the FIFO
+ * level). It is acceptable to return 1 if an indeterminant number
+ * of characters is waiting.
+ *
+ * This method is optional.
+ *
+ * @dev: Device pointer
+ * @input: true to check input characters, false for output
+ * @return number of waiting characters, 0 for none, -ve on error
+ */
+ int (*pending)(struct udevice *dev, bool input);
+ /**
+ * clear() - Clear the serial FIFOs/holding registers
+ *
+ * This method is optional.
+ *
+ * This quickly clears any input/output characters from the UART.
+ * If this is not possible, but characters still exist, then it
+ * is acceptable to return -EAGAIN (try again) or -EINVAL (not
+ * supported).
+ *
+ * @dev: Device pointer
+ * @return 0 if OK, -ve on error
+ */
+ int (*clear)(struct udevice *dev);
+#if CONFIG_POST & CONFIG_SYS_POST_UART
+ /**
+ * loop() - Control serial device loopback mode
+ *
+ * @dev: Device pointer
+ * @on: 1 to turn loopback on, 0 to turn if off
+ */
+ int (*loop)(struct udevice *dev, int on);
+#endif
+};
+
+/**
+ * struct serial_dev_priv - information about a device used by the uclass
+ *
+ * @sdev: stdio device attached to this uart
+ */
+struct serial_dev_priv {
+ struct stdio_dev *sdev;
+};
+
+/* Access the serial operations for a device */
+#define serial_get_ops(dev) ((struct dm_serial_ops *)(dev)->driver->ops)
+
#endif