diff options
Diffstat (limited to 'arch/arm/mach-socfpga/include/mach/debug_ll.h')
| -rw-r--r-- | arch/arm/mach-socfpga/include/mach/debug_ll.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/arm/mach-socfpga/include/mach/debug_ll.h b/arch/arm/mach-socfpga/include/mach/debug_ll.h new file mode 100644 index 0000000000..f378435970 --- /dev/null +++ b/arch/arm/mach-socfpga/include/mach/debug_ll.h @@ -0,0 +1,55 @@ +#ifndef __MACH_DEBUG_LL_H__ +#define __MACH_DEBUG_LL_H__ + +#include <io.h> + +#define UART_BASE 0xffc02000 + +#define LSR_THRE 0x20 /* Xmit holding register empty */ +#define LSR (5 << 2) +#define THR (0 << 2) + +#define LCR_BKSE 0x80 /* Bank select enable */ +#define LSR (5 << 2) +#define THR (0 << 2) +#define DLL (0 << 2) +#define IER (1 << 2) +#define DLM (1 << 2) +#define FCR (2 << 2) +#define LCR (3 << 2) +#define MCR (4 << 2) +#define MDR (8 << 2) + +static inline unsigned int ns16550_calc_divisor(unsigned int clk, + unsigned int baudrate) +{ + return (clk / 16 / baudrate); +} + +static inline void INIT_LL(void) +{ + unsigned int clk = 100000000; + unsigned int divisor = clk / 16 / 115200; + + writeb(0x00, UART_BASE + LCR); + writeb(0x00, UART_BASE + IER); + writeb(0x07, UART_BASE + MDR); + writeb(LCR_BKSE, UART_BASE + LCR); + writeb(divisor & 0xff, UART_BASE + DLL); + writeb(divisor >> 8, UART_BASE + DLM); + writeb(0x03, UART_BASE + LCR); + writeb(0x03, UART_BASE + MCR); + writeb(0x07, UART_BASE + FCR); + writeb(0x00, UART_BASE + MDR); +} + +static inline void PUTC_LL(char c) +{ + /* Wait until there is space in the FIFO */ + while ((readb(UART_BASE + LSR) & LSR_THRE) == 0); + /* Send the character */ + writeb(c, UART_BASE + THR); + /* Wait to make sure it hits the line, in case we die too soon. */ + while ((readb(UART_BASE + LSR) & LSR_THRE) == 0); +} +#endif |