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serial: serial_xen: add DEBUG_UART support
By using a hypervisor call, we can implement DEBUG_UART on xen. This will allow us to see messages even earlier than serial_init(). Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
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@ -401,11 +401,19 @@ config DEBUG_UART_MTK
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driver will be available until the real driver model serial is
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driver will be available until the real driver model serial is
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running.
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running.
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config DEBUG_UART_XEN
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bool "XEN Hypervisor Console"
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depends on XEN_SERIAL
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help
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Select this to enable a debug UART using the serial_xen driver. You
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will not have to provide any parameters to make this work. The driver
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will be available until the real driver-model serial is running.
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endchoice
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endchoice
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config DEBUG_UART_BASE
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config DEBUG_UART_BASE
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hex "Base address of UART"
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hex "Base address of UART"
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depends on DEBUG_UART
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depends on DEBUG_UART && !DEBUG_UART_XEN
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default 0 if DEBUG_UART_SANDBOX
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default 0 if DEBUG_UART_SANDBOX
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help
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help
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This is the base address of your UART for memory-mapped UARTs.
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This is the base address of your UART for memory-mapped UARTs.
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@ -415,7 +423,7 @@ config DEBUG_UART_BASE
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config DEBUG_UART_CLOCK
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config DEBUG_UART_CLOCK
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int "UART input clock"
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int "UART input clock"
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depends on DEBUG_UART
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depends on DEBUG_UART && !DEBUG_UART_XEN
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default 0 if DEBUG_UART_SANDBOX
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default 0 if DEBUG_UART_SANDBOX
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help
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help
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The UART input clock determines the speed of the internal UART
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The UART input clock determines the speed of the internal UART
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@ -427,7 +435,7 @@ config DEBUG_UART_CLOCK
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config DEBUG_UART_SHIFT
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config DEBUG_UART_SHIFT
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int "UART register shift"
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int "UART register shift"
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depends on DEBUG_UART
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depends on DEBUG_UART && !DEBUG_UART_XEN
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default 0 if DEBUG_UART
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default 0 if DEBUG_UART
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help
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help
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Some UARTs (notably ns16550) support different register layouts
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Some UARTs (notably ns16550) support different register layouts
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@ -5,6 +5,7 @@
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*/
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*/
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#include <common.h>
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#include <common.h>
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#include <cpu_func.h>
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#include <cpu_func.h>
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#include <debug_uart.h>
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#include <dm.h>
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#include <dm.h>
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#include <serial.h>
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#include <serial.h>
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#include <watchdog.h>
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#include <watchdog.h>
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@ -15,11 +16,14 @@
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#include <xen/events.h>
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#include <xen/events.h>
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#include <xen/interface/sched.h>
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#include <xen/interface/sched.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/hvm/hvm_op.h>
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#include <xen/interface/hvm/hvm_op.h>
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#include <xen/interface/hvm/params.h>
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#include <xen/interface/hvm/params.h>
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#include <xen/interface/io/console.h>
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#include <xen/interface/io/console.h>
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#include <xen/interface/io/ring.h>
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#include <xen/interface/io/ring.h>
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#include <asm/xen/hypercall.h>
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DECLARE_GLOBAL_DATA_PTR;
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DECLARE_GLOBAL_DATA_PTR;
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u32 console_evtchn;
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u32 console_evtchn;
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@ -178,3 +182,19 @@ U_BOOT_DRIVER(serial_xen) = {
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.flags = DM_FLAG_PRE_RELOC,
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.flags = DM_FLAG_PRE_RELOC,
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};
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};
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#if defined(CONFIG_DEBUG_UART_XEN)
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static inline void _debug_uart_init(void) {}
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static inline void _debug_uart_putc(int c)
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{
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#if CONFIG_IS_ENABLED(ARM)
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xen_debug_putc(c);
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#else
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/* the type cast should work on LE only */
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HYPERVISOR_console_io(CONSOLEIO_write, 1, (char *)&ch);
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#endif
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}
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DEBUG_UART_FUNCS
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#endif
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