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[POWERPC] 4xx: Add early udbg support for 40x processors

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This adds some basic real mode based early udbg support for 40x
in order to debug things more easily

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This commit is contained in:
Benjamin Herrenschmidt
2007-12-21 15:39:26 +11:00
committed by Josh Boyer
parent 69c0785112
commit 9dae8afdf2
6 changed files with 90 additions and 0 deletions
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33
arch/powerpc/kernel/udbg_16550.c
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@@ -225,3 +225,36 @@ void __init udbg_init_44x_as1(void)
udbg_getc = udbg_44x_as1_getc;
}
#endif /* CONFIG_PPC_EARLY_DEBUG_44x */
#ifdef CONFIG_PPC_EARLY_DEBUG_40x
static void udbg_40x_real_putc(char c)
{
if (udbg_comport) {
while ((real_readb(&udbg_comport->lsr) & LSR_THRE) == 0)
/* wait for idle */;
real_writeb(c, &udbg_comport->thr); eieio();
if (c == '\n')
udbg_40x_real_putc('\r');
}
}
static int udbg_40x_real_getc(void)
{
if (udbg_comport) {
while ((real_readb(&udbg_comport->lsr) & LSR_DR) == 0)
; /* wait for char */
return real_readb(&udbg_comport->rbr);
}
return -1;
}
void __init udbg_init_40x_realmode(void)
{
udbg_comport = (struct NS16550 __iomem *)
CONFIG_PPC_EARLY_DEBUG_40x_PHYSADDR;
udbg_putc = udbg_40x_real_putc;
udbg_getc = udbg_40x_real_getc;
udbg_getc_poll = NULL;
}
#endif /* CONFIG_PPC_EARLY_DEBUG_40x */