/* ASB2305-specific 8250 serial ports * * Copyright (C) 2007 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 Licence * as published by the Free Software Foundation; either version * 2 of the Licence, 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 <linux/serial_reg.h> #define SERIAL_PORT0_BASE_ADDRESS 0xA6FB0000 #define ASB2305_DEBUG_MCR __SYSREG(0xA6FB0000 + UART_MCR * 2, u8) #define SERIAL_IRQ XIRQ0 /* Dual serial (PC16552) (Hi) */ /* * The ASB2305 has an 18.432 MHz clock the UART */ #define BASE_BAUD (18432000 / 16) /* * dispose of the /dev/ttyS0 serial port */ #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 = 2, \ .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 ASB2305 doesnt have a /dev/ttyS1 #endif #ifndef __ASSEMBLY__ #define TTYS0_TX __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX * 4, u8) #define TTYS0_MCR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8) #define TTYS0_LSR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8) #define TTYS0_MSR __SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8) #define LSR_WAIT_FOR(STATE) \ do { \ while (!(TTYS0_LSR & UART_LSR_##STATE)) {} \ } while (0) #define FLOWCTL_WAIT_FOR(LINE) \ do { \ while (!(TTYS0_MSR & UART_MSR_##LINE)) {} \ } while (0) #define FLOWCTL_CLEAR(LINE) \ do { \ TTYS0_MCR &= ~UART_MCR_##LINE; \ } while (0) #define FLOWCTL_SET(LINE) \ do { \ TTYS0_MCR |= UART_MCR_##LINE; \ } while (0) #define FLOWCTL_QUERY(LINE) ({ TTYS0_MSR & UART_MSR_##LINE; }) static inline void __debug_to_serial(const char *p, int n) { char ch; FLOWCTL_SET(DTR); for (; n > 0; n--) { LSR_WAIT_FOR(THRE); FLOWCTL_WAIT_FOR(CTS); ch = *p++; if (ch == 0x0a) { TTYS0_TX = 0x0d; LSR_WAIT_FOR(THRE); FLOWCTL_WAIT_FOR(CTS); } TTYS0_TX = ch; } FLOWCTL_CLEAR(DTR); } #endif /* !__ASSEMBLY__ */ #endif /* CONFIG_GDBSTUB_ON_TTYSx */ #endif /* _ASM_UNIT_SERIAL_H */