diff options
Diffstat (limited to 'arch/mips/mach-ath79/include/mach/debug_ll_ar9331.h')
| -rw-r--r-- | arch/mips/mach-ath79/include/mach/debug_ll_ar9331.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/mips/mach-ath79/include/mach/debug_ll_ar9331.h b/arch/mips/mach-ath79/include/mach/debug_ll_ar9331.h new file mode 100644 index 0000000000..04bd3ea72b --- /dev/null +++ b/arch/mips/mach-ath79/include/mach/debug_ll_ar9331.h @@ -0,0 +1,176 @@ +/* + * based on linux.git/drivers/tty/serial/ar933x_uart.c + * + * This file is part of barebox. + * See file CREDITS for list of people who contributed to this project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#ifndef __AR933X_DEBUG_LL__ +#define __AR933X_DEBUG_LL__ + +#include <asm/addrspace.h> +#include <mach/ar71xx_regs.h> + +#define DEBUG_LL_UART_ADDR KSEG1ADDR(AR933X_UART_BASE) + +#define AR933X_UART_DATA_REG 0x00 +#define AR933X_UART_DATA_TX_RX_MASK 0xff +#define AR933X_UART_DATA_TX_CSR 0x200 +#define AR933X_UART_DATA_RX_CSR 0x100 + +#ifndef __ASSEMBLY__ + +#include <io.h> + +/* + * C macros + */ + +static inline void ar933x_debug_ll_writel(u32 b, int offset) +{ + __raw_writel(b, (u8 *)DEBUG_LL_UART_ADDR + offset); +} + +static inline u32 ar933x_debug_ll_readl(int offset) +{ + return __raw_readl((u8 *)DEBUG_LL_UART_ADDR + offset); +} + +static inline void PUTC_LL(int ch) +{ + u32 data; + + /* wait transmitter ready */ + data = ar933x_debug_ll_readl(AR933X_UART_DATA_REG); + while (!(data & AR933X_UART_DATA_TX_CSR)) + data = ar933x_debug_ll_readl(AR933X_UART_DATA_REG); + + data = (ch & AR933X_UART_DATA_TX_RX_MASK) | AR933X_UART_DATA_TX_CSR; + ar933x_debug_ll_writel(data, AR933X_UART_DATA_REG); +} +#else /* __ASSEMBLY__ */ +/* + * Macros for use in assembly language code + */ + +#define AR933X_UART_CS_REG 0x04 +#define UART_CS_REG ((KSEG1 | AR933X_UART_BASE) | AR933X_UART_CS_REG) +#define AR933X_UART_CS_IF_MODE_S 2 +#define AR933X_UART_CS_IF_MODE_DCE 2 +#define AR933X_UART_CS_TX_READY_ORIDE BIT(7) +#define AR933X_UART_CS_RX_READY_ORIDE BIT(8) + +/* + * simple uart clock setup + * from u-boot_mod/u-boot/cpu/mips/ar7240/hornet_serial.c + */ +#define BAUD_CLOCK 25000000 +#define CLOCK_SCALE ((BAUD_CLOCK / (16 * CONFIG_BAUDRATE)) - 1) +#define CLOCK_STEP 0x2000 + +#define AR933X_UART_CLOCK_REG 0x08 +#define CLOCK_REG ((KSEG1 | AR933X_UART_BASE) | AR933X_UART_CLOCK_REG) + +.macro debug_ll_ar9331_init +#ifdef CONFIG_DEBUG_LL + + pbl_reg_writel ((AR933X_UART_CS_IF_MODE_DCE << AR933X_UART_CS_IF_MODE_S) \ + | AR933X_UART_CS_TX_READY_ORIDE \ + | AR933X_UART_CS_RX_READY_ORIDE), UART_CS_REG + pbl_reg_writel ((CLOCK_SCALE << 16) | CLOCK_STEP), CLOCK_REG + +#endif /* CONFIG_DEBUG_LL */ +.endm + +/* + * output a character in a0 + */ +.macro debug_ll_outc_a0 +#ifdef CONFIG_DEBUG_LL + .set push + .set reorder + + la t0, DEBUG_LL_UART_ADDR +201: + lw t1, AR933X_UART_DATA_REG(t0) /* get line status */ + andi t1, t1, AR933X_UART_DATA_TX_CSR /* check for transmitter empty */ + beqz t1, 201b /* try again */ + andi a0, a0, AR933X_UART_DATA_TX_RX_MASK + ori a0, a0, AR933X_UART_DATA_TX_CSR + sw a0, 0(t0) /* write the character */ + .set pop +#endif /* CONFIG_DEBUG_LL */ +.endm + +/* + * output a character + */ +.macro debug_ll_outc chr +#ifdef CONFIG_DEBUG_LL + li a0, \chr + debug_ll_outc_a0 +#endif /* CONFIG_DEBUG_LL */ +.endm + +/* + * check character in input buffer + * return value: + * v0 = 0 no character in input buffer + * v0 != 0 character in input buffer + */ +/* FIXME: use tstc */ +.macro debug_ll_tstc +#ifdef CONFIG_DEBUG_LL + .set push + .set reorder + + la t0, DEBUG_LL_UART_ADDR + + /* get line status and check for data present */ + lw v0, AR933X_UART_DATA_REG(t0) + andi v0, v0, AR933X_UART_DATA_RX_CSR + + .set pop +#endif /* CONFIG_DEBUG_LL */ +.endm + +/* + * get character to v0 + */ +.macro debug_ll_getc +#ifdef CONFIG_DEBUG_LL + .set push + .set reorder + + la t0, DEBUG_LL_UART_ADDR +204: + lw v0, AR933X_UART_DATA_REG(t0) + andi v0, v0, AR933X_UART_DATA_RX_CSR + + /* try again */ + beqz v0, 204b + + /* read a character */ + lw v0, AR933X_UART_DATA_REG(t0) + andi v0, v0, AR933X_UART_DATA_TX_RX_MASK + + /* remove the character from the FIFO */ + li t1, AR933X_UART_DATA_RX_CSR + sw t1, AR933X_UART_DATA_REG(t0) + + .set pop +#endif /* CONFIG_DEBUG_LL */ +.endm +#endif /* __ASSEMBLY__ */ + +#endif /* __AR933X_DEBUG_LL__ */ |