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x86: baytrail: Add option to disable the internal UART to setup_early_uart()

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This patch adds a parameter to the function setup_early_uart() to either
enable or disable the internal BayTrail legacy UART. Since the name
setup_early_uart() does not match its functionality any more, lets
rename it to setup_internal_uart() as well in this patch.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Stefan Roese 2016-01-19 14:24:12 +01:00 committed by Bin Meng
parent 85056932f2
commit d521197d69
4 changed files with 10 additions and 6 deletions
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10
arch/x86/cpu/baytrail/early_uart.c
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@ -59,11 +59,15 @@ static void x86_pci_write_config32(int dev, unsigned int where, u32 value)
}
/* This can be called after memory-mapped PCI is working */
int setup_early_uart(void)
int setup_internal_uart(int enable)
{
/* Enable the legacy UART hardware. */
/* Enable or disable the legacy UART hardware */
x86_pci_write_config32(PCI_DEV_CONFIG(0, LPC_DEV, LPC_FUNC), UART_CONT,
1);
enable);
/* All done for the disable part, so just return */
if (!enable)
return 0;
/*
* Set up the pads to the UART function. This allows the signals to

2
arch/x86/include/asm/u-boot-x86.h
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@ -45,7 +45,7 @@ void dram_init_banksize(void);
int default_print_cpuinfo(void);
/* Set up a UART which can be used with printch(), printhex8(), etc. */
int setup_early_uart(void);
int setup_internal_uart(int enable);
void setup_pcat_compatibility(void);

2
arch/x86/lib/fsp/fsp_support.c
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@ -111,7 +111,7 @@ void fsp_init(u32 stack_top, u32 boot_mode, void *nvs_buf)
#endif
#ifdef CONFIG_DEBUG_UART
setup_early_uart();
setup_internal_uart(1);
#endif
fsp_hdr = find_fsp_header();

2
doc/README.x86
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@ -706,7 +706,7 @@ the board, then you can use post_code() calls from C or assembler to monitor
boot progress. This can be good for debugging.
If not, you can try to get serial working as early as possible. The early
debug serial port may be useful here. See setup_early_uart() for an example.
debug serial port may be useful here. See setup_internal_uart() for an example.
During the U-Boot porting, one of the important steps is to write correct PIRQ
routing information in the board device tree. Without it, device drivers in the