linux-kernel - [PATCH 3/3] serial: pl011: add acpi

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Message-Id: <1453722324-22407-4-git-send-email-aleksey.makarov@linaro.org>
Date:	Mon, 25 Jan 2016 17:45:23 +0600
From:	Aleksey Makarov <aleksey.makarov@...aro.org>
To:	linux-acpi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-serial@...r.kernel.org,
	Aleksey Makarov <aleksey.makarov@...aro.org>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Jiri Slaby <jslaby@...e.com>,
	Robert Moore <robert.moore@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <lenb@...nel.org>, devel@...ica.org
Subject: [PATCH 3/3] serial: pl011: add acpi_match for amba-pl011.c

Add an implementation of acpi_match() to the pl011 driver.
It allows to check if the console matches one specified with
ACPI SPCR table.

Signed-off-by: Aleksey Makarov <aleksey.makarov@...aro.org>
---
 drivers/tty/serial/amba-pl011.c | 14 ++++++++++++++
 include/acpi/actbl2.h           |  4 ++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 899a771..3f4aa1b 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2189,12 +2189,26 @@ static int __init pl011_console_setup(struct console *co, char *options)
 	return uart_set_options(&uap->port, co, baud, parity, bits, flow);
 }
 
+static int __init pl011_console_acpi_match(struct console *co,
+					   struct acpi_table_spcr *spcr)
+{
+	struct uart_amba_port *uap = amba_ports[co->index];
+
+	if (spcr->interface_type == ACPI_DBG2_ARM_PL011 &&
+	    spcr->serial_port.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY &&
+	    spcr->serial_port.address == (u64)uap->port.mapbase)
+		return 0;
+
+	return -ENODEV;
+}
+
 static struct uart_driver amba_reg;
 static struct console amba_console = {
 	.name		= "ttyAMA",
 	.write		= pl011_console_write,
 	.device		= uart_console_device,
 	.setup		= pl011_console_setup,
+	.acpi_match	= pl011_console_acpi_match,
 	.flags		= CON_PRINTBUFFER,
 	.index		= -1,
 	.data		= &amba_reg,
diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index 6e28f54..ce4cb37 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -371,6 +371,10 @@ struct acpi_dbg2_device {
 
 #define ACPI_DBG2_16550_COMPATIBLE  0x0000
 #define ACPI_DBG2_16550_SUBSET      0x0001
+#define ACPI_DBG2_ARM_PL011         0x0003
+#define ACPI_DBG2_ARM_SBSA_GENERIC  0x000e
+#define ACPI_DBG2_ARM_DCC           0x000f
+#define ACPI_DBG2_DCM2835           0x0010
 
 #define ACPI_DBG2_1394_STANDARD     0x0000
 
-- 
2.7.0