sandbox: Convert serial driver to use driver model

Adjust the sandbox serial driver to use the new driver model uclass. The
driver works much as before, but within the new framework.

Signed-off-by: Simon Glass <sjg@chromium.org>

2 files changed, 39 insertions, 31 deletions

diff --git a/drivers/serial/sandbox.c b/drivers/serial/sandbox.c
index 51fd871..ac54e01 100644
--- a/drivers/serial/sandbox.c
+++ b/drivers/serial/sandbox.c
@@ -11,12 +11,16 @@
  */
 
 #include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
 #include <lcd.h>
 #include <os.h>
 #include <serial.h>
 #include <linux/compiler.h>
 #include <asm/state.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 /*
  *
  *   serial_buf: A buffer that holds keyboard characters for the
@@ -30,27 +34,21 @@ static char serial_buf[16];
 static unsigned int serial_buf_write;
 static unsigned int serial_buf_read;
 
-static int sandbox_serial_init(void)
+static int sandbox_serial_probe(struct udevice *dev)
 {
 	struct sandbox_state *state = state_get_current();
 
 	if (state->term_raw != STATE_TERM_COOKED)
 		os_tty_raw(0, state->term_raw == STATE_TERM_RAW_WITH_SIGS);
-	return 0;
-}
 
-static void sandbox_serial_setbrg(void)
-{
+	return 0;
 }
 
-static void sandbox_serial_putc(const char ch)
+static int sandbox_serial_putc(struct udevice *dev, const char ch)
 {
 	os_write(1, &ch, 1);
-}
 
-static void sandbox_serial_puts(const char *str)
-{
-	os_write(1, str, strlen(str));
+	return 0;
 }
 
 static unsigned int increment_buffer_index(unsigned int index)
@@ -58,12 +56,15 @@ static unsigned int increment_buffer_index(unsigned int index)
 	return (index + 1) % ARRAY_SIZE(serial_buf);
 }
 
-static int sandbox_serial_tstc(void)
+static int sandbox_serial_pending(struct udevice *dev, bool input)
 {
 	const unsigned int next_index =
 		increment_buffer_index(serial_buf_write);
 	ssize_t count;
 
+	if (!input)
+		return 0;
+
 	os_usleep(100);
 #ifdef CONFIG_LCD
 	lcd_sync();
@@ -74,38 +75,42 @@ static int sandbox_serial_tstc(void)
 	count = os_read_no_block(0, &serial_buf[serial_buf_write], 1);
 	if (count == 1)
 		serial_buf_write = next_index;
+
 	return serial_buf_write != serial_buf_read;
 }
 
-static int sandbox_serial_getc(void)
+static int sandbox_serial_getc(struct udevice *dev)
 {
 	int result;
 
-	while (!sandbox_serial_tstc())
-		;	/* buffer empty */
+	if (!sandbox_serial_pending(dev, true))
+		return -EAGAIN;	/* buffer empty */
 
 	result = serial_buf[serial_buf_read];
 	serial_buf_read = increment_buffer_index(serial_buf_read);
 	return result;
 }
 
-static struct serial_device sandbox_serial_drv = {
-	.name	= "sandbox_serial",
-	.start	= sandbox_serial_init,
-	.stop	= NULL,
-	.setbrg	= sandbox_serial_setbrg,
-	.putc	= sandbox_serial_putc,
-	.puts	= sandbox_serial_puts,
-	.getc	= sandbox_serial_getc,
-	.tstc	= sandbox_serial_tstc,
+static const struct dm_serial_ops sandbox_serial_ops = {
+	.putc = sandbox_serial_putc,
+	.pending = sandbox_serial_pending,
+	.getc = sandbox_serial_getc,
 };
 
-void sandbox_serial_initialize(void)
-{
-	serial_register(&sandbox_serial_drv);
-}
+static const struct udevice_id sandbox_serial_ids[] = {
+	{ .compatible = "sandbox,serial" },
+	{ }
+};
 
-__weak struct serial_device *default_serial_console(void)
-{
-	return &sandbox_serial_drv;
-}
+U_BOOT_DRIVER(serial_sandbox) = {
+	.name	= "serial_sandbox",
+	.id	= UCLASS_SERIAL,
+	.of_match = sandbox_serial_ids,
+	.probe = sandbox_serial_probe,
+	.ops	= &sandbox_serial_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
+
+U_BOOT_DEVICE(serial_sandbox_non_fdt) = {
+	.name = "serial_sandbox",
+};
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index bf2d25c..f5fa4b3 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -31,6 +31,9 @@
 #define CONFIG_DM_DEMO_SHAPE
 #define CONFIG_DM_GPIO
 #define CONFIG_DM_TEST
+#define CONFIG_DM_SERIAL
+
+#define CONFIG_SYS_STDIO_DEREGISTER
 
 /* Number of bits in a C 'long' on this architecture */
 #define CONFIG_SANDBOX_BITS_PER_LONG	64