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| author | Eric Miao <eric.y.miao@gmail.com> | 2010-02-19 08:49:39 +0300 |
|---|---|---|
| committer | Eric Miao <eric.y.miao@gmail.com> | 2010-03-02 02:40:58 +0300 |
| commit | c95efee13303d9ff9e67f2600174f492039311ce (patch) | |
| tree | f9bfd75688391f2dc999e8431e049371bba8fc97 /arch | |
| parent | 2029e5643a3c4fdd4ad20169fb950cc16e023d0c (diff) | |
| download | linux-c95efee13303d9ff9e67f2600174f492039311ce.tar.xz | |
[ARM] pxa: refactor uncompress.h for non-PXA uarts
The original patch came from Marc Zyngier where support of 8250-compatible
UART is required to show the uncompress information. Modified a little bit
here, including changes below:
1. #include <mach/regs-uart.h> is actually not necessary
2. introduced uart_{read,write}() for different base and shift
3. introduced uart_is_enabled() and assumed enabled always for
non-PXA uarts
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
Acked-by: Marc Zyngier <maz@misterjones.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-pxa/include/mach/uncompress.h | 35 |
1 files changed, 28 insertions, 7 deletions
diff --git a/arch/arm/mach-pxa/include/mach/uncompress.h b/arch/arm/mach-pxa/include/mach/uncompress.h index 237734b5b1be..4888a21947b0 100644 --- a/arch/arm/mach-pxa/include/mach/uncompress.h +++ b/arch/arm/mach-pxa/include/mach/uncompress.h @@ -10,20 +10,41 @@ */ #include <linux/serial_reg.h> -#include <mach/regs-uart.h> #include <asm/mach-types.h> -#define __REG(x) ((volatile unsigned long *)x) +#define FFUART_BASE (0x40100000) +#define BTUART_BASE (0x40200000) +#define STUART_BASE (0x40700000) -static volatile unsigned long *UART = FFUART; +static unsigned long uart_base = FFUART_BASE; +static unsigned int uart_shift = 2; +static unsigned int uart_is_pxa = 1; + +static inline unsigned char uart_read(int offset) +{ + return *(volatile unsigned char *)(uart_base + (offset << uart_shift)); +} + +static inline void uart_write(unsigned char val, int offset) +{ + *(volatile unsigned char *)(uart_base + (offset << uart_shift)) = val; +} + +static inline int uart_is_enabled(void) +{ + /* assume enabled by default for non-PXA uarts */ + return uart_is_pxa ? uart_read(UART_IER) & UART_IER_UUE : 1; +} static inline void putc(char c) { - if (!(UART[UART_IER] & IER_UUE)) + if (!uart_is_enabled()) return; - while (!(UART[UART_LSR] & LSR_TDRQ)) + + while (!(uart_read(UART_LSR) & UART_LSR_THRE)) barrier(); - UART[UART_TX] = c; + + uart_write(c, UART_TX); } /* @@ -38,7 +59,7 @@ static inline void arch_decomp_setup(void) if (machine_is_littleton() || machine_is_intelmote2() || machine_is_csb726() || machine_is_stargate2() || machine_is_cm_x300() || machine_is_balloon3()) - UART = STUART; + uart_base = STUART_BASE; } /* |