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/* Unit-specific 8250 serial ports
*
* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.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.
*/
#ifndef _ASM_UNIT_SERIAL_H
#define _ASM_UNIT_SERIAL_H
#include <asm/cpu-regs.h>
#include <proc/irq.h>
#include <unit/fpga-regs.h>
#include <linux/serial_reg.h>
#define SERIAL_PORT0_BASE_ADDRESS 0xA8200000
#define SERIAL_IRQ XIRQ1 /* single serial (TL16C550C) (Lo) */
/*
* The ASB2364 has an 12.288 MHz clock
* for your UART.
*
* It'd be nice if someone built a serial card with a 24.576 MHz
* clock, since the 16550A is capable of handling a top speed of 1.5
* megabits/second; but this requires the faster clock.
*/
#define BASE_BAUD (12288000 / 16)
/*
* dispose of the /dev/ttyS0 and /dev/ttyS1 serial ports
*/
#ifndef CONFIG_GDBSTUB_ON_TTYSx
#define SERIAL_PORT_DFNS \
{ \
.baud_base = BASE_BAUD, \
.irq = SERIAL_IRQ, \
.flags = STD_COM_FLAGS, \
.iomem_base = (u8 *) SERIAL_PORT0_BASE_ADDRESS, \
.iomem_reg_shift = 1, \
.io_type = SERIAL_IO_MEM, \
},
#ifndef __ASSEMBLY__
static inline void __debug_to_serial(const char *p, int n)
{
}
#endif /* !__ASSEMBLY__ */
#else /* CONFIG_GDBSTUB_ON_TTYSx */
#define SERIAL_PORT_DFNS /* stolen by gdb-stub */
#if defined(CONFIG_GDBSTUB_ON_TTYS0)
#define GDBPORT_SERIAL_RX __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_RX * 4, u8)
#define GDBPORT_SERIAL_TX __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX * 4, u8)
#define GDBPORT_SERIAL_DLL __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLL * 4, u8)
#define GDBPORT_SERIAL_DLM __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLM * 4, u8)
#define GDBPORT_SERIAL_IER __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 4, u8)
#define GDBPORT_SERIAL_IIR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IIR * 4, u8)
#define GDBPORT_SERIAL_FCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_FCR * 4, u8)
#define GDBPORT_SERIAL_LCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LCR * 4, u8)
#define GDBPORT_SERIAL_MCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
#define GDBPORT_SERIAL_LSR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
#define GDBPORT_SERIAL_MSR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
#define GDBPORT_SERIAL_SCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_SCR * 4, u8)
#define GDBPORT_SERIAL_IRQ SERIAL_IRQ
#elif defined(CONFIG_GDBSTUB_ON_TTYS1)
#error The ASB2364 does not have a /dev/ttyS1
#endif
#ifndef __ASSEMBLY__
static inline void __debug_to_serial(const char *p, int n)
{
char ch;
#define LSR_WAIT_FOR(STATE) \
do {} while (!(GDBPORT_SERIAL_LSR & UART_LSR_##STATE))
#define FLOWCTL_QUERY(LINE) \
({ GDBPORT_SERIAL_MSR & UART_MSR_##LINE; })
#define FLOWCTL_WAIT_FOR(LINE) \
do {} while (!(GDBPORT_SERIAL_MSR & UART_MSR_##LINE))
#define FLOWCTL_CLEAR(LINE) \
do { GDBPORT_SERIAL_MCR &= ~UART_MCR_##LINE; } while (0)
#define FLOWCTL_SET(LINE) \
do { GDBPORT_SERIAL_MCR |= UART_MCR_##LINE; } while (0)
FLOWCTL_SET(DTR);
for (; n > 0; n--) {
LSR_WAIT_FOR(THRE);
FLOWCTL_WAIT_FOR(CTS);
ch = *p++;
if (ch == 0x0a) {
GDBPORT_SERIAL_TX = 0x0d;
LSR_WAIT_FOR(THRE);
FLOWCTL_WAIT_FOR(CTS);
}
GDBPORT_SERIAL_TX = ch;
}
FLOWCTL_CLEAR(DTR);
}
#endif /* !__ASSEMBLY__ */
#endif /* CONFIG_GDBSTUB_ON_TTYSx */
#define SERIAL_INITIALIZE \
do { \
/* release reset */ \
ASB2364_FPGA_REG_RESET_UART = 0x0001; \
SyncExBus(); \
} while (0)
#define SERIAL_CHECK_INTERRUPT \
do { \
if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) == 0x0001) { \
return IRQ_NONE; \
} \
} while (0)
#define SERIAL_CLEAR_INTERRUPT \
do { \
ASB2364_FPGA_REG_IRQ_UART = 0x0001; \
SyncExBus(); \
} while (0)
#define SERIAL_SET_INT_MASK \
do { \
ASB2364_FPGA_REG_MASK_UART = 0x0001; \
SyncExBus(); \
} while (0)
#define SERIAL_CLEAR_INT_MASK \
do { \
ASB2364_FPGA_REG_MASK_UART = 0x0000; \
SyncExBus(); \
} while (0)
#endif /* _ASM_UNIT_SERIAL_H */
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