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. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
