/* * arch/ppc/syslib/gen550_dbg.c * * A library of polled 16550 serial routines. These are intended to * be used to support progress messages, xmon, kgdb, etc. on a * variety of platforms. * * Adapted from lots of code ripped from the arch/ppc/boot/ polled * 16550 support. * * Author: Matt Porter <mporter@mvista.com> * * 2002-2003 (c) MontaVista Software, Inc. This file is licensed under * the terms of the GNU General Public License version 2. This program * is licensed "as is" without any warranty of any kind, whether express * or implied. */ #include <linux/config.h> #include <linux/types.h> #include <linux/serial.h> #include <linux/tty.h> /* For linux/serial_core.h */ #include <linux/serial_core.h> #include <linux/serialP.h> #include <linux/serial_reg.h> #include <asm/machdep.h> #include <asm/serial.h> #include <asm/io.h> #define SERIAL_BAUD 9600 /* SERIAL_PORT_DFNS is defined in <asm/serial.h> */ #ifndef SERIAL_PORT_DFNS #define SERIAL_PORT_DFNS #endif static struct serial_state rs_table[RS_TABLE_SIZE] = { SERIAL_PORT_DFNS /* defined in <asm/serial.h> */ }; static void (*serial_outb)(unsigned long, unsigned char); static unsigned long (*serial_inb)(unsigned long); static int shift; unsigned long direct_inb(unsigned long addr) { return readb((void __iomem *)addr); } void direct_outb(unsigned long addr, unsigned char val) { writeb(val, (void __iomem *)addr); } unsigned long io_inb(unsigned long port) { return inb(port); } void io_outb(unsigned long port, unsigned char val) { outb(val, port); } unsigned long serial_init(int chan, void *ignored) { unsigned long com_port; unsigned char lcr, dlm; /* We need to find out which type io we're expecting. If it's * 'SERIAL_IO_PORT', we get an offset from the isa_io_base. * If it's 'SERIAL_IO_MEM', we can the exact location. -- Tom */ switch (rs_table[chan].io_type) { case SERIAL_IO_PORT: com_port = rs_table[chan].port; serial_outb = io_outb; serial_inb = io_inb; break; case SERIAL_IO_MEM: com_port = (unsigned long)rs_table[chan].iomem_base; serial_outb = direct_outb; serial_inb = direct_inb; break; default: /* We can't deal with it. */ return -1; } /* How far apart the registers are. */ shift = rs_table[chan].iomem_reg_shift; /* save the LCR */ lcr = serial_inb(com_port + (UART_LCR << shift)); /* Access baud rate */ serial_outb(com_port + (UART_LCR << shift), UART_LCR_DLAB); dlm = serial_inb(com_port + (UART_DLM << shift)); /* * Test if serial port is unconfigured * We assume that no-one uses less than 110 baud or * less than 7 bits per character these days. * -- paulus. */ if ((dlm <= 4) && (lcr & 2)) { /* port is configured, put the old LCR back */ serial_outb(com_port + (UART_LCR << shift), lcr); } else { /* Input clock. */ serial_outb(com_port + (UART_DLL << shift), (rs_table[chan].baud_base / SERIAL_BAUD) & 0xFF); serial_outb(com_port + (UART_DLM << shift), (rs_table[chan].baud_base / SERIAL_BAUD) >> 8); /* 8 data, 1 stop, no parity */ serial_outb(com_port + (UART_LCR << shift), 0x03); /* RTS/DTR */ serial_outb(com_port + (UART_MCR << shift), 0x03); /* Clear & enable FIFOs */ serial_outb(com_port + (UART_FCR << shift), 0x07); } return (com_port); } void serial_putc(unsigned long com_port, unsigned char c) { while ((serial_inb(com_port + (UART_LSR << shift)) & UART_LSR_THRE) == 0) ; serial_outb(com_port, c); } unsigned char serial_getc(unsigned long com_port) { while ((serial_inb(com_port + (UART_LSR << shift)) & UART_LSR_DR) == 0) ; return serial_inb(com_port); } int serial_tstc(unsigned long com_port) { return ((serial_inb(com_port + (UART_LSR << shift)) & UART_LSR_DR) != 0); } void serial_close(unsigned long com_port) { } void gen550_init(int i, struct uart_port *serial_req) { rs_table[i].io_type = serial_req->iotype; rs_table[i].port = serial_req->iobase; rs_table[i].iomem_base = serial_req->membase; rs_table[i].iomem_reg_shift = serial_req->regshift; rs_table[i].baud_base = serial_req->uartclk ? serial_req->uartclk / 16 : BASE_BAUD; } #ifdef CONFIG_SERIAL_TEXT_DEBUG void gen550_progress(char *s, unsigned short hex) { volatile unsigned int progress_debugport; volatile char c; progress_debugport = serial_init(0, NULL); serial_putc(progress_debugport, '\r'); while ((c = *s++) != 0) serial_putc(progress_debugport, c); serial_putc(progress_debugport, '\n'); serial_putc(progress_debugport, '\r'); } #endif /* CONFIG_SERIAL_TEXT_DEBUG */