1a42e53d17
This patch only deals with the serial port definitions as there is no support for any other xilinx IP cores in the kernel tree at the moment. Board specific configuration moved out of virtex.[ch] and into the xparameters.h wrapper. This also prepares for the transition to the flattened device tree model. When the bootloader provides a device tree generated from an xparameters.h files, the kernel will no longer need xparameters/*. The platform bus will get populated with data from the device tree, and the device drivers will be automatically connected to the devices. Only the bootloader (or ppcboot) will need xparameters directly. Signed-off-by: Grant C. Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/*
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* COM1 NS16550 support
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/serial.h>
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#include <linux/serial_reg.h>
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#include <asm/serial.h>
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#if defined(CONFIG_XILINX_VIRTEX)
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#include <platforms/4xx/xparameters/xparameters.h>
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#endif
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#include "nonstdio.h"
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#include "serial.h"
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#define SERIAL_BAUD 9600
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extern unsigned long ISA_io;
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static struct serial_state rs_table[RS_TABLE_SIZE] = {
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SERIAL_PORT_DFNS /* Defined in <asm/serial.h> */
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};
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static int shift;
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unsigned long serial_init(int chan, void *ignored)
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{
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unsigned long com_port, base_baud;
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unsigned char lcr, dlm;
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/* We need to find out which type io we're expecting. If it's
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* 'SERIAL_IO_PORT', we get an offset from the isa_io_base.
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* If it's 'SERIAL_IO_MEM', we can the exact location. -- Tom */
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switch (rs_table[chan].io_type) {
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case SERIAL_IO_PORT:
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com_port = rs_table[chan].port;
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break;
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case SERIAL_IO_MEM:
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com_port = (unsigned long)rs_table[chan].iomem_base;
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break;
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default:
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/* We can't deal with it. */
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return -1;
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}
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/* How far apart the registers are. */
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shift = rs_table[chan].iomem_reg_shift;
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/* Base baud.. */
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base_baud = rs_table[chan].baud_base;
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/* save the LCR */
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lcr = inb(com_port + (UART_LCR << shift));
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/* Access baud rate */
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outb(com_port + (UART_LCR << shift), 0x80);
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dlm = inb(com_port + (UART_DLM << shift));
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/*
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* Test if serial port is unconfigured.
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* We assume that no-one uses less than 110 baud or
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* less than 7 bits per character these days.
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* -- paulus.
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*/
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if ((dlm <= 4) && (lcr & 2))
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/* port is configured, put the old LCR back */
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outb(com_port + (UART_LCR << shift), lcr);
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else {
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/* Input clock. */
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outb(com_port + (UART_DLL << shift),
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(base_baud / SERIAL_BAUD) & 0xFF);
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outb(com_port + (UART_DLM << shift),
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(base_baud / SERIAL_BAUD) >> 8);
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/* 8 data, 1 stop, no parity */
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outb(com_port + (UART_LCR << shift), 0x03);
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/* RTS/DTR */
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outb(com_port + (UART_MCR << shift), 0x03);
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}
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/* Clear & enable FIFOs */
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outb(com_port + (UART_FCR << shift), 0x07);
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return (com_port);
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}
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void
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serial_putc(unsigned long com_port, unsigned char c)
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{
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while ((inb(com_port + (UART_LSR << shift)) & UART_LSR_THRE) == 0)
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;
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outb(com_port, c);
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}
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unsigned char
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serial_getc(unsigned long com_port)
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{
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while ((inb(com_port + (UART_LSR << shift)) & UART_LSR_DR) == 0)
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;
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return inb(com_port);
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}
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int
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serial_tstc(unsigned long com_port)
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{
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return ((inb(com_port + (UART_LSR << shift)) & UART_LSR_DR) != 0);
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}
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