Update Kconfig to select GENERIC_UART_INIT for basic UART init ( find a dt node
and call device specific device_init() ).
Drop `default n if RISCV` statement for config HAS_NS16550 as now ns16550 is
ready to be compiled and used by RISC-V. Also, make the config user selectable
for everyone except X86.
Initialize a minimal amount of stuff to have UART and Xen console:
- Initialize uart by calling uart_init().
- Initialize Xen console by calling console_init_{pre,post}irq().
- Initialize timer and its internal lists which are used by
init_timer() which is called by ns16550_init_postirq(); otherwise
"Unhandled exception: Store/AMO Page Fault" occurs.
- Enable local interrupt to recieve an input from UART
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
---
Changes in v2:
- Drop #include <xen/keyhandler.h> in setup.c, isn't needed anymore.
- Drop call of percpu_init_areas() as it was needed when I used polling
mode for UART, for this case percpu is used to receive serial port info:
struct serial_port *port = this_cpu(poll_port);
So percpu isn't really needed at the current development state.
- Make HAS_NS16550 user selectable for everyone, except X86.
- Update the commit message.
---
xen/arch/riscv/Kconfig | 1 +
xen/arch/riscv/setup.c | 13 +++++++++++++
xen/drivers/char/Kconfig | 3 +--
3 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/xen/arch/riscv/Kconfig b/xen/arch/riscv/Kconfig
index 60520dab57..eb44318dda 100644
--- a/xen/arch/riscv/Kconfig
+++ b/xen/arch/riscv/Kconfig
@@ -2,6 +2,7 @@ config RISCV
def_bool y
select FUNCTION_ALIGNMENT_16B
select GENERIC_BUG_FRAME
+ select GENERIC_UART_INIT
select HAS_DEVICE_TREE
select HAS_PMAP
select HAS_UBSAN
diff --git a/xen/arch/riscv/setup.c b/xen/arch/riscv/setup.c
index 4f92266224..5c7cd568f0 100644
--- a/xen/arch/riscv/setup.c
+++ b/xen/arch/riscv/setup.c
@@ -4,12 +4,16 @@
#include <xen/bug.h>
#include <xen/bootfdt.h>
#include <xen/compile.h>
+#include <xen/console.h>
#include <xen/device_tree.h>
#include <xen/init.h>
#include <xen/irq.h>
#include <xen/mm.h>
+#include <xen/percpu.h>
+#include <xen/serial.h>
#include <xen/shutdown.h>
#include <xen/smp.h>
+#include <xen/timer.h>
#include <xen/vmap.h>
#include <xen/xvmalloc.h>
@@ -136,8 +140,17 @@ void __init noreturn start_xen(unsigned long bootcpu_id,
intc_preinit();
+ uart_init();
+ console_init_preirq();
+
intc_init();
+ timer_init();
+
+ local_irq_enable();
+
+ console_init_postirq();
+
printk("All set up\n");
machine_halt();
diff --git a/xen/drivers/char/Kconfig b/xen/drivers/char/Kconfig
index e6e12bb413..8e49a52c73 100644
--- a/xen/drivers/char/Kconfig
+++ b/xen/drivers/char/Kconfig
@@ -2,8 +2,7 @@ config GENERIC_UART_INIT
bool
config HAS_NS16550
- bool "NS16550 UART driver" if ARM
- default n if RISCV
+ bool "NS16550 UART driver" if !X86
default y
help
This selects the 16550-series UART support. For most systems, say Y.
--
2.49.0