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Diffstat (limited to 'arch/ppc/syslib/gen550_dbg.c')
| -rw-r--r-- | arch/ppc/syslib/gen550_dbg.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/arch/ppc/syslib/gen550_dbg.c b/arch/ppc/syslib/gen550_dbg.c new file mode 100644 index 000000000000..9ef0113c83d1 --- /dev/null +++ b/arch/ppc/syslib/gen550_dbg.c @@ -0,0 +1,182 @@ +/* + * 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 */ |