[PATCH V3 3/5] ARM: tegra: decouple uncompress.h and debug-macro.S
Stephen Warren
swarren at wwwdotorg.org
Mon Oct 22 12:24:32 EDT 2012
On 10/22/2012 02:18 AM, Peter De Schrijver wrote:
>> +
>> +#define checkuart(rp, rv, lhu, bit, uart) \
>> + /* Load address of CLK_RST register */ \
>> + movw rp, #TEGRA_CLK_RST_DEVICES_##lhu & 0xffff ; \
>> + movt rp, #TEGRA_CLK_RST_DEVICES_##lhu >> 16 ; \
>> + /* Load value from CLK_RST register */ \
>> + ldr rp, [rp, #0] ; \
>> + /* Test UART's reset bit */ \
>> + tst rp, #(1 << bit) ; \
>> + /* If set, can't use UART; jump to save no UART */ \
>> + bne 90f ; \
>> + /* Load address of CLK_OUT_ENB register */ \
>> + movw rp, #TEGRA_CLK_OUT_ENB_##lhu & 0xffff ; \
>> + movt rp, #TEGRA_CLK_OUT_ENB_##lhu >> 16 ; \
>> + /* Load value from CLK_OUT_ENB register */ \
>> + ldr rp, [rp, #0] ; \
>> + /* Test UART's clock enable bit */ \
>> + tst rp, #(1 << bit) ; \
>> + /* If clear, can't use UART; jump to save no UART */ \
>> + beq 90f ; \
>> + /* Passed all tests, load address of UART registers */ \
>> + movw rp, #TEGRA_UART##uart##_BASE & 0xffff ; \
>> + movt rp, #TEGRA_UART##uart##_BASE >> 16 ; \
>> + /* Jump to save UART address */ \
>> + b 91f
>>
>
> Maybe make this a subroutine?
The addruart macro (which in turn uses the checkuart macro) is only
allowed to use 3 registers; rp, rv, rtmp. I'm also not 100% sure if the
stack is guaranteed to be set up when addruart is called either. So, I
don't think making this a function is possible.
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