[PATCH v4 18/21] arm/acpi: Add a new ACPI initialized function for UART

From: Shannon Zhao <zhaoshenglong@huawei.com>
To: xen-devel@lists.xen.org
Cc: ian.campbell@citrix.com, stefano.stabellini@eu.citrix.com,
	peter.huangpeng@huawei.com, julien.grall@citrix.com,
	stefano.stabellini@citrix.com, shannon.zhao@linaro.org
Subject: [PATCH v4 18/21] arm/acpi: Add a new ACPI initialized function for UART
Date: Sat, 23 Jan 2016 17:20:10 +0800	[thread overview]
Message-ID: <1453540813-15764-19-git-send-email-zhaoshenglong@huawei.com> (raw)
In-Reply-To: <1453540813-15764-1-git-send-email-zhaoshenglong@huawei.com>

From: Shannon Zhao <shannon.zhao@linaro.org>

This adds a new function to initialize UART for ACPI on ARM.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 xen/arch/arm/setup.c        |  2 +-
 xen/drivers/char/arm-uart.c | 33 +++++++++++++++++++++++++++++++--
 xen/include/xen/serial.h    |  2 +-
 3 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index c15a09d..63feadf 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -766,7 +766,7 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     gic_preinit();
 
-    dt_uart_init();
+    arm_uart_init();
     console_init_preirq();
     console_init_ring();
 
diff --git a/xen/drivers/char/arm-uart.c b/xen/drivers/char/arm-uart.c
index 883e615..a68959b 100644
--- a/xen/drivers/char/arm-uart.c
+++ b/xen/drivers/char/arm-uart.c
@@ -1,7 +1,7 @@
 /*
  * xen/drivers/char/arm-uart.c
  *
- * Generic uart retrieved via the device tree
+ * Generic uart retrieved via the device tree or ACPI
  *
  * Julien Grall <julien.grall@linaro.org>
  * Copyright (c) 2013 Linaro Limited.
@@ -23,6 +23,7 @@
 #include <xen/device_tree.h>
 #include <xen/serial.h>
 #include <xen/errno.h>
+#include <xen/acpi.h>
 
 /*
  * Configure UART port with a string:
@@ -35,7 +36,7 @@
 static char __initdata opt_dtuart[256] = "";
 string_param("dtuart", opt_dtuart);
 
-void __init dt_uart_init(void)
+static void __init dt_uart_init(void)
 {
     struct dt_device_node *dev;
     int ret;
@@ -96,6 +97,34 @@ void __init dt_uart_init(void)
         printk("Unable to initialize dtuart: %d\n", ret);
 }
 
+static void __init acpi_uart_init(void)
+{
+#ifdef CONFIG_ACPI
+    struct acpi_table_spcr *spcr=NULL;
+    int ret;
+
+    acpi_get_table(ACPI_SIG_SPCR, 0,(struct acpi_table_header **)&spcr);
+
+    if ( spcr == NULL )
+        printk("Unable to get spcr table\n");
+    else
+    {
+        ret = acpi_device_init(DEVICE_SERIAL, NULL, spcr->interface_type);
+
+        if ( ret )
+            printk("Unable to initialize acpi uart: %d\n", ret);
+    }
+#endif
+}
+
+void __init arm_uart_init(void)
+{
+    if ( acpi_disabled )
+        dt_uart_init();
+    else
+        acpi_uart_init();
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/xen/serial.h b/xen/include/xen/serial.h
index 71e6ade..5e1a536 100644
--- a/xen/include/xen/serial.h
+++ b/xen/include/xen/serial.h
@@ -170,7 +170,7 @@ struct ns16550_defaults {
 void ns16550_init(int index, struct ns16550_defaults *defaults);
 void ehci_dbgp_init(void);
 
-void __init dt_uart_init(void);
+void __init arm_uart_init(void);
 
 struct physdev_dbgp_op;
 int dbgp_op(const struct physdev_dbgp_op *);
-- 
2.0.4
