[U-Boot] [PATCH v1 1/2] WIP: serial: Introduce ->getinfo() callback

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

TBD

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/serial/ns16550.c       | 14 ++++++++++++++
 drivers/serial/serial-uclass.c | 21 +++++++++++++++++++++
 include/common.h               |  3 +++
 include/serial.h               | 14 ++++++++++++++
 4 files changed, 52 insertions(+)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index f9041aa626..a996446936 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -334,6 +334,19 @@ static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
 	return 0;
 }
 
+static int ns16550_serial_getinfo(struct udevice *dev, struct serial_device_info *info)
+{
+	struct NS16550 *const com_port = dev_get_priv(dev);
+	struct ns16550_platdata *plat = com_port->plat;
+
+	info->addr_space = 0;
+	info->reg_width = 8;
+	info->reg_shift = plat->reg_shift;
+	info->reg_offset = plat->reg_offset;
+	info->addr = plat->base;
+	return 0;
+}
+
 int ns16550_serial_probe(struct udevice *dev)
 {
 	struct NS16550 *const com_port = dev_get_priv(dev);
@@ -440,6 +453,7 @@ const struct dm_serial_ops ns16550_serial_ops = {
 	.pending = ns16550_serial_pending,
 	.getc = ns16550_serial_getc,
 	.setbrg = ns16550_serial_setbrg,
+	.getinfo = ns16550_serial_getinfo,
 };
 
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c
index ffdcae0931..4778302e8f 100644
--- a/drivers/serial/serial-uclass.c
+++ b/drivers/serial/serial-uclass.c
@@ -304,6 +304,25 @@ int serial_setconfig(uint config)
 	return 0;
 }
 
+int serial_getinfo(struct serial_device_info *info)
+{
+	struct dm_serial_ops *ops;
+
+	if (!gd->cur_serial_dev)
+		return -ENODEV;
+
+	if (!info)
+		return -EINVAL;
+
+	info->baudrate = gd->baudrate;
+
+	ops = serial_get_ops(gd->cur_serial_dev);
+	if (ops->getinfo)
+		return ops->getinfo(gd->cur_serial_dev, info);
+
+	return -EINVAL;
+}
+
 void serial_stdio_init(void)
 {
 }
@@ -421,6 +440,8 @@ static int serial_post_probe(struct udevice *dev)
 	if (ops->loop)
 		ops->loop += gd->reloc_off
 #endif
+	if (ops->getinfo)
+		ops->getinfo += gd->reloc_off;
 #endif
 	/* Set the baud rate */
 	if (ops->setbrg) {
diff --git a/include/common.h b/include/common.h
index 83b3bdc58d..0479f3eac1 100644
--- a/include/common.h
+++ b/include/common.h
@@ -349,6 +349,8 @@ void smp_set_core_boot_addr(unsigned long addr, int corenr);
 void smp_kick_all_cpus(void);
 
 /* $(CPU)/serial.c */
+struct serial_device_info;
+
 int	serial_init   (void);
 void	serial_setbrg (void);
 void	serial_putc   (const char);
@@ -357,6 +359,7 @@ void	serial_puts   (const char *);
 int	serial_getc   (void);
 int	serial_tstc   (void);
 int	serial_setconfig(uint config);
+int	serial_getinfo(struct serial_device_info *info);
 
 /* $(CPU)/speed.c */
 int	get_clocks (void);
diff --git a/include/serial.h b/include/serial.h
index 020cd392e8..c73477b079 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -111,6 +111,16 @@ enum serial_stop {
 				SERIAL_8_BITS << SERIAL_BITS_SHIFT | \
 				SERIAL_ONE_STOP << SERIAL_STOP_SHIFT
 
+/* REVISIT: ACPI GAS specification implied */
+struct serial_device_info {
+	unsigned int baudrate;
+	u8	addr_space; /* 0 - MMIO, 1 - IO */
+	u8	reg_width;
+	u8	reg_offset;
+	u8	reg_shift;
+	u64	addr;
+};
+
 /**
  * struct struct dm_serial_ops - Driver model serial operations
  *
@@ -201,6 +211,10 @@ struct dm_serial_ops {
 	 * @return 0 if OK, -ve on error
 	 */
 	int (*setconfig)(struct udevice *dev, uint serial_config);
+	/**
+	 * getinfo() - Get serial device information
+	 */
+	int (*getinfo)(struct udevice *dev, struct serial_device_info *info);
 };
 
 /**
-- 
2.18.0