mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 02:36:39 +09:00
064b55cfcb
There was for long time no activity in the mpx5xxx area. We need to go further and convert to Kconfig, but it turned out, nobody is interested anymore in mpc5xxx, so remove it. Signed-off-by: Heiko Schocher <hs@denx.de>
148 lines
2.9 KiB
C
148 lines
2.9 KiB
C
/***********************************************************************
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*
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* (C) Copyright 2004-2009
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* DENX Software Engineering
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* Wolfgang Denk, wd@denx.de
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*
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* Simple 16550A serial driver
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*
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* Originally from linux source (drivers/char/ps2ser.c)
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*
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* Used by the PS/2 multiplexer driver (ps2mult.c)
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*
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***********************************************************************/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/atomic.h>
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#include <ps2mult.h>
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/* This is needed for ns16550.h */
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#ifndef CONFIG_SYS_NS16550_REG_SIZE
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#define CONFIG_SYS_NS16550_REG_SIZE 1
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#endif
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#include <ns16550.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* #define DEBUG */
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#define PS2SER_BAUD 57600
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#if CONFIG_PS2SERIAL == 1
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#define COM_BASE (CONFIG_SYS_CCSRBAR+0x4500)
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#elif CONFIG_PS2SERIAL == 2
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#define COM_BASE (CONFIG_SYS_CCSRBAR+0x4600)
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#else
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#error CONFIG_PS2SERIAL must be in 1 ... 2
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#endif
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static int ps2ser_getc_hw(void);
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static void ps2ser_interrupt(void *dev_id);
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extern struct serial_state rs_table[]; /* in serial.c */
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static u_char ps2buf[PS2BUF_SIZE];
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static atomic_t ps2buf_cnt;
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static int ps2buf_in_idx;
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static int ps2buf_out_idx;
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int ps2ser_init(void)
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{
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NS16550_t com_port = (NS16550_t)COM_BASE;
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com_port->ier = 0x00;
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com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
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com_port->dll = (CONFIG_SYS_NS16550_CLK / 16 / PS2SER_BAUD) & 0xff;
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com_port->dlm = ((CONFIG_SYS_NS16550_CLK / 16 / PS2SER_BAUD) >> 8) & 0xff;
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com_port->lcr = UART_LCR_8N1;
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com_port->mcr = (UART_MCR_DTR | UART_MCR_RTS);
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com_port->fcr = (UART_FCR_FIFO_EN | UART_FCR_RXSR | UART_FCR_TXSR);
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return (0);
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}
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void ps2ser_putc(int chr)
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{
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NS16550_t com_port = (NS16550_t)COM_BASE;
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debug(">>>> 0x%02x\n", chr);
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while ((com_port->lsr & UART_LSR_THRE) == 0);
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com_port->thr = chr;
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}
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static int ps2ser_getc_hw(void)
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{
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NS16550_t com_port = (NS16550_t)COM_BASE;
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int res = -1;
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if (com_port->lsr & UART_LSR_DR) {
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res = com_port->rbr;
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}
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return res;
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}
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int ps2ser_getc(void)
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{
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volatile int chr;
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int flags;
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debug("<< ");
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flags = disable_interrupts();
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do {
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if (atomic_read(&ps2buf_cnt) != 0) {
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chr = ps2buf[ps2buf_out_idx++];
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ps2buf_out_idx &= (PS2BUF_SIZE - 1);
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atomic_dec(&ps2buf_cnt);
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} else {
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chr = ps2ser_getc_hw();
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}
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}
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while (chr < 0);
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if (flags)
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enable_interrupts();
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debug("0x%02x\n", chr);
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return chr;
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}
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int ps2ser_check(void)
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{
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int flags;
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flags = disable_interrupts();
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ps2ser_interrupt(NULL);
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if (flags) enable_interrupts();
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return atomic_read(&ps2buf_cnt);
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}
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static void ps2ser_interrupt(void *dev_id)
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{
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NS16550_t com_port = (NS16550_t)COM_BASE;
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int chr;
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int status;
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do {
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chr = ps2ser_getc_hw();
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status = com_port->lsr;
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if (chr < 0) continue;
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if (atomic_read(&ps2buf_cnt) < PS2BUF_SIZE) {
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ps2buf[ps2buf_in_idx++] = chr;
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ps2buf_in_idx &= (PS2BUF_SIZE - 1);
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atomic_inc(&ps2buf_cnt);
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} else {
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printf ("ps2ser.c: buffer overflow\n");
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}
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} while (status & UART_LSR_DR);
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if (atomic_read(&ps2buf_cnt)) {
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ps2mult_callback(atomic_read(&ps2buf_cnt));
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}
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}
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