diff options
Diffstat (limited to 'arch/powerpc/kernel/udbg_16550.c')
| -rw-r--r-- | arch/powerpc/kernel/udbg_16550.c | 43 |
1 files changed, 38 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c index 833a3d0bcfa..cb01ebc5938 100644 --- a/arch/powerpc/kernel/udbg_16550.c +++ b/arch/powerpc/kernel/udbg_16550.c @@ -46,7 +46,7 @@ struct NS16550 { #define LCR_DLAB 0x80 -static volatile struct NS16550 __iomem *udbg_comport; +static struct NS16550 __iomem *udbg_comport; static void udbg_550_putc(char c) { @@ -117,7 +117,7 @@ unsigned int udbg_probe_uart_speed(void __iomem *comport, unsigned int clock) { unsigned int dll, dlm, divisor, prescaler, speed; u8 old_lcr; - volatile struct NS16550 __iomem *port = comport; + struct NS16550 __iomem *port = comport; old_lcr = in_8(&port->lcr); @@ -162,7 +162,7 @@ void udbg_maple_real_putc(char c) void __init udbg_init_maple_realmode(void) { - udbg_comport = (volatile struct NS16550 __iomem *)0xf40003f8; + udbg_comport = (struct NS16550 __iomem *)0xf40003f8; udbg_putc = udbg_maple_real_putc; udbg_getc = NULL; @@ -184,7 +184,7 @@ void udbg_pas_real_putc(char c) void udbg_init_pas_realmode(void) { - udbg_comport = (volatile struct NS16550 __iomem *)0xfcff03f8UL; + udbg_comport = (struct NS16550 __iomem *)0xfcff03f8UL; udbg_putc = udbg_pas_real_putc; udbg_getc = NULL; @@ -219,9 +219,42 @@ static int udbg_44x_as1_getc(void) void __init udbg_init_44x_as1(void) { udbg_comport = - (volatile struct NS16550 __iomem *)PPC44x_EARLY_DEBUG_VIRTADDR; + (struct NS16550 __iomem *)PPC44x_EARLY_DEBUG_VIRTADDR; udbg_putc = udbg_44x_as1_putc; 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 */ |