diff options
Diffstat (limited to 'arch/mips/basler/excite/excite_dbg_io.c')
| -rw-r--r-- | arch/mips/basler/excite/excite_dbg_io.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/arch/mips/basler/excite/excite_dbg_io.c b/arch/mips/basler/excite/excite_dbg_io.c new file mode 100644 index 0000000..83f6bdd --- /dev/null +++ b/arch/mips/basler/excite/excite_dbg_io.c @@ -0,0 +1,122 @@ +/* + * Copyright (C) 2004 by Basler Vision Technologies AG + * Author: Thomas Koeller <thomas.koeller@baslerweb.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/config.h> +#include <linux/linkage.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <asm/gdb-stub.h> +#include <asm/rm9k-ocd.h> +#include <excite.h> + +#if defined(CONFIG_SERIAL_8250) && CONFIG_SERIAL_8250_NR_UARTS > 1 +#error Debug port used by serial driver +#endif + +#define UART_CLK 25000000 +#define BASE_BAUD (UART_CLK / 16) +#define REGISTER_BASE_0 0x0208UL +#define REGISTER_BASE_1 0x0238UL + +#define REGISTER_BASE_DBG REGISTER_BASE_1 + +#define CPRR 0x0004 +#define UACFG 0x0200 +#define UAINTS 0x0204 +#define UARBR (REGISTER_BASE_DBG + 0x0000) +#define UATHR (REGISTER_BASE_DBG + 0x0004) +#define UADLL (REGISTER_BASE_DBG + 0x0008) +#define UAIER (REGISTER_BASE_DBG + 0x000c) +#define UADLH (REGISTER_BASE_DBG + 0x0010) +#define UAIIR (REGISTER_BASE_DBG + 0x0014) +#define UAFCR (REGISTER_BASE_DBG + 0x0018) +#define UALCR (REGISTER_BASE_DBG + 0x001c) +#define UAMCR (REGISTER_BASE_DBG + 0x0020) +#define UALSR (REGISTER_BASE_DBG + 0x0024) +#define UAMSR (REGISTER_BASE_DBG + 0x0028) +#define UASCR (REGISTER_BASE_DBG + 0x002c) + +#define PARITY_NONE 0 +#define PARITY_ODD 0x08 +#define PARITY_EVEN 0x18 +#define PARITY_MARK 0x28 +#define PARITY_SPACE 0x38 + +#define DATA_5BIT 0x0 +#define DATA_6BIT 0x1 +#define DATA_7BIT 0x2 +#define DATA_8BIT 0x3 + +#define STOP_1BIT 0x0 +#define STOP_2BIT 0x4 + +#define BAUD_DBG 57600 +#define PARITY_DBG PARITY_NONE +#define DATA_DBG DATA_8BIT +#define STOP_DBG STOP_1BIT + +/* Initialize the serial port for KGDB debugging */ +void __init excite_kgdb_init(void) +{ + const u32 divisor = BASE_BAUD / BAUD_DBG; + + /* Take the UART out of reset */ + titan_writel(0x00ff1cff, CPRR); + titan_writel(0x00000000, UACFG); + titan_writel(0x00000002, UACFG); + + titan_writel(0x0, UALCR); + titan_writel(0x0, UAIER); + + /* Disable FIFOs */ + titan_writel(0x00, UAFCR); + + titan_writel(0x80, UALCR); + titan_writel(divisor & 0xff, UADLL); + titan_writel((divisor & 0xff00) >> 8, UADLH); + titan_writel(0x0, UALCR); + + titan_writel(DATA_DBG | PARITY_DBG | STOP_DBG, UALCR); + + /* Enable receiver interrupt */ + titan_readl(UARBR); + titan_writel(0x1, UAIER); +} + +int getDebugChar(void) +{ + while (!(titan_readl(UALSR) & 0x1)); + return titan_readl(UARBR); +} + +int putDebugChar(int data) +{ + while (!(titan_readl(UALSR) & 0x20)); + titan_writel(data, UATHR); + return 1; +} + +/* KGDB interrupt handler */ +asmlinkage void excite_kgdb_inthdl(struct pt_regs *regs) +{ + if (unlikely( + ((titan_readl(UAIIR) & 0x7) == 4) + && ((titan_readl(UARBR) & 0xff) == 0x3))) + set_async_breakpoint(®s->cp0_epc); +} |