[PATCH v3 36/62] arm/acpi: Initialize serial port from ACPI SPCR table
shannon.zhao at linaro.org
shannon.zhao at linaro.org
Tue Nov 17 01:40:35 PST 2015
From: Parth Dixit <parth.dixit at linaro.org>
Parse ACPI SPCR (Serial Port Console Redirection table) table and
initialize the serial port pl011.
Signed-off-by: Naresh Bhat <naresh.bhat at linaro.org>
Signed-off-by: Parth Dixit <parth.dixit at linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
---
xen/drivers/char/pl011.c | 37 +++++++++++++++++++++++++++++++++++++
xen/include/acpi/actbl2.h | 5 +++++
2 files changed, 42 insertions(+)
diff --git a/xen/drivers/char/pl011.c b/xen/drivers/char/pl011.c
index 1efb1cf..7106f1c 100644
--- a/xen/drivers/char/pl011.c
+++ b/xen/drivers/char/pl011.c
@@ -27,6 +27,7 @@
#include <asm/device.h>
#include <xen/mm.h>
#include <xen/vmap.h>
+#include <xen/acpi.h>
#include <asm/pl011-uart.h>
#include <asm/io.h>
@@ -308,6 +309,42 @@ DT_DEVICE_START(pl011, "PL011 UART", DEVICE_SERIAL)
.init = dt_pl011_uart_init,
DT_DEVICE_END
+#ifdef CONFIG_ACPI
+static int __init acpi_pl011_uart_init(const void *data)
+{
+ acpi_status status;
+ struct acpi_table_spcr *spcr=NULL;
+ int res;
+
+ status = acpi_get_table(ACPI_SIG_SPCR, 0,
+ (struct acpi_table_header **)&spcr);
+
+ if ( ACPI_FAILURE(status) )
+ {
+ printk("pl011: Failed to get SPCR table\n");
+ return -EINVAL;
+ }
+
+ /* trigger/polarity information is not available in spcr */
+ irq_set_type(spcr->interrupt, ACPI_IRQ_TYPE_EDGE_BOTH);
+
+ res = pl011_uart_init(spcr->interrupt, spcr->serial_port.address,
+ PAGE_SIZE);
+ if ( res < 0 )
+ {
+ printk("pl011: Unable to initialize\n");
+ return res;
+ }
+
+ return 0;
+}
+
+ACPI_DEVICE_START(apl011, "PL011 UART", DEVICE_SERIAL)
+ .class_type = ACPI_SPCR_TYPE_PL011,
+ .init = acpi_pl011_uart_init,
+ACPI_DEVICE_END
+#endif
+
/*
* Local variables:
* mode: C
diff --git a/xen/include/acpi/actbl2.h b/xen/include/acpi/actbl2.h
index 87bc6b3..25be429 100644
--- a/xen/include/acpi/actbl2.h
+++ b/xen/include/acpi/actbl2.h
@@ -815,6 +815,11 @@ struct acpi_table_spcr {
#define ACPI_SPCR_DO_NOT_DISABLE (1)
+/* UART Interface type */
+#define ACPI_SPCR_TYPE_16550 0
+#define ACPI_SPCR_TYPE_16550_SUB 1
+#define ACPI_SPCR_TYPE_PL011 3
+
/*******************************************************************************
*
* SPMI - Server Platform Management Interface table
--
2.1.0
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