c101.c
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上传日期:2013-04-10
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文件大小:8k
- /*
- * Moxa C101 synchronous serial card driver for Linux
- *
- * Copyright (C) 2000 Krzysztof Halasa <khc@pm.waw.pl>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * For information see http://hq.pm.waw.pl/hdlc/
- *
- * Sources of information:
- * Hitachi HD64570 SCA User's Manual
- * Moxa C101 User's Manual
- */
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/types.h>
- #include <linux/string.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/netdevice.h>
- #include <linux/hdlc.h>
- #include <linux/delay.h>
- #include <asm/io.h>
- #include "hd64570.h"
- #define DEBUG_RINGS
- /* #define DEBUG_PKT */
- static const char* version = "Moxa C101 driver revision: 1.02 for Linux 2.4";
- static const char* devname = "C101";
- #define C101_PAGE 0x1D00
- #define C101_DTR 0x1E00
- #define C101_SCA 0x1F00
- #define C101_WINDOW_SIZE 0x2000
- #define C101_MAPPED_RAM_SIZE 0x4000
- #define RAM_SIZE (256 * 1024)
- #define CLOCK_BASE 9830400 /* 9.8304 MHz */
- #define PAGE0_ALWAYS_MAPPED
- static char *hw; /* pointer to hw=xxx command line string */
- typedef struct card_s {
- hdlc_device hdlc; /* HDLC device struct - must be first */
- spinlock_t lock; /* TX lock */
- int clkmode; /* clock mode */
- int clkrate; /* clock speed */
- int line; /* loopback only */
- u8 *win0base; /* ISA window base address */
- u32 phy_winbase; /* ISA physical base address */
- u16 buff_offset; /* offset of first buffer of first channel */
- u8 rxs, txs, tmc; /* SCA registers */
- u8 irq; /* IRQ (3-15) */
- u8 ring_buffers; /* number of buffers in a ring */
- u8 page;
- u8 rxin; /* rx ring buffer 'in' pointer */
- u8 txin; /* tx ring buffer 'in' and 'last' pointers */
- u8 txlast;
- u8 rxpart; /* partial frame received, next frame invalid*/
- struct card_s *next_card;
- }card_t;
- typedef card_t port_t;
- #define sca_in(reg, card) readb((card)->win0base + C101_SCA + (reg))
- #define sca_out(value, reg, card) writeb(value, (card)->win0base + C101_SCA + (reg))
- #define sca_inw(reg, card) readw((card)->win0base + C101_SCA + (reg))
- #define sca_outw(value, reg, card) writew(value, (card)->win0base + C101_SCA + (reg))
- #define port_to_card(port) (port)
- #define log_node(port) (0)
- #define phy_node(port) (0)
- #define winsize(card) (C101_WINDOW_SIZE)
- #define win0base(card) ((card)->win0base)
- #define winbase(card) ((card)->win0base + 0x2000)
- #define get_port(card, port) ((port) == 0 ? (card) : NULL)
- static inline u8 sca_get_page(card_t *card)
- {
- return card->page;
- }
- static inline void openwin(card_t *card, u8 page)
- {
- card->page = page;
- writeb(page, card->win0base + C101_PAGE);
- }
- #define close_windows(card) {} /* no hardware support */
- #include "hd6457x.c"
- static int c101_set_clock(port_t *port, int value)
- {
- u8 msci = get_msci(port);
- u8 rxs = port->rxs & CLK_BRG_MASK;
- u8 txs = port->txs & CLK_BRG_MASK;
- switch(value) {
- case CLOCK_EXT:
- rxs |= CLK_LINE_RX; /* RXC input */
- txs |= CLK_LINE_TX; /* TXC input */
- break;
- case CLOCK_INT:
- rxs |= CLK_BRG_RX; /* TX clock */
- txs |= CLK_RXCLK_TX; /* BRG output */
- break;
- case CLOCK_TXINT:
- rxs |= CLK_LINE_RX; /* RXC input */
- txs |= CLK_BRG_TX; /* BRG output */
- break;
- case CLOCK_TXFROMRX:
- rxs |= CLK_LINE_RX; /* RXC input */
- txs |= CLK_RXCLK_TX; /* RX clock */
- break;
- default:
- return -EINVAL;
- }
- port->rxs = rxs;
- port->txs = txs;
- sca_out(rxs, msci + RXS, port);
- sca_out(txs, msci + TXS, port);
- port->clkmode = value;
- return 0;
- }
- static int c101_open(hdlc_device *hdlc)
- {
- port_t *port = hdlc_to_port(hdlc);
- MOD_INC_USE_COUNT;
- writeb(1, port->win0base + C101_DTR);
- sca_out(0, MSCI1_OFFSET + CTL, port); /* RTS uses ch#2 output */
- sca_open(hdlc);
- c101_set_clock(port, port->clkmode);
- return 0;
- }
- static void c101_close(hdlc_device *hdlc)
- {
- port_t *port = hdlc_to_port(hdlc);
- sca_close(hdlc);
- writeb(0, port->win0base + C101_DTR);
- sca_out(CTL_NORTS, MSCI1_OFFSET + CTL, port);
- MOD_DEC_USE_COUNT;
- }
- static int c101_ioctl(hdlc_device *hdlc, struct ifreq *ifr, int cmd)
- {
- int value = ifr->ifr_ifru.ifru_ivalue;
- int result = 0;
- port_t *port = hdlc_to_port(hdlc);
- if(!capable(CAP_NET_ADMIN))
- return -EPERM;
- switch(cmd) {
- case HDLCSCLOCK:
- result = c101_set_clock(port, value);
- case HDLCGCLOCK:
- value = port->clkmode;
- break;
- case HDLCSCLOCKRATE:
- port->clkrate = value;
- sca_set_clock(port);
- case HDLCGCLOCKRATE:
- value = port->clkrate;
- break;
- case HDLCSLINE:
- result = sca_set_loopback(port, value);
- case HDLCGLINE:
- value = port->line;
- break;
- #ifdef DEBUG_RINGS
- case HDLCRUN:
- sca_dump_rings(hdlc);
- return 0;
- #endif /* DEBUG_RINGS */
- default:
- return -EINVAL;
- }
- ifr->ifr_ifru.ifru_ivalue = value;
- return result;
- }
- static void c101_destroy_card(card_t *card)
- {
- if (card->irq)
- free_irq(card->irq, card);
- if (card->win0base) {
- iounmap(card->win0base);
- release_mem_region(card->phy_winbase, C101_MAPPED_RAM_SIZE);
- }
- kfree(card);
- }
- static int c101_run(unsigned long irq, unsigned long winbase)
- {
- card_t *card;
- int result;
- if (irq<3 || irq>15 || irq == 6) /* FIXME */ {
- printk(KERN_ERR "c101: invalid IRQ valuen");
- return -ENODEV;
- }
- if (winbase < 0xC0000 || winbase > 0xDFFFF || (winbase & 0x3FFF) !=0) {
- printk(KERN_ERR "c101: invalid RAM valuen");
- return -ENODEV;
- }
- card = kmalloc(sizeof(card_t), GFP_KERNEL);
- if (card == NULL) {
- printk(KERN_ERR "c101: unable to allocate memoryn");
- return -ENOBUFS;
- }
- memset(card, 0, sizeof(card_t));
- if (request_irq(irq, sca_intr, 0, devname, card)) {
- printk(KERN_ERR "c101: could not allocate IRQn");
- c101_destroy_card(card);
- return(-EBUSY);
- }
- card->irq = irq;
- if (!request_mem_region(winbase, C101_MAPPED_RAM_SIZE, devname)) {
- printk(KERN_ERR "c101: could not request RAM windown");
- c101_destroy_card(card);
- return(-EBUSY);
- }
- card->phy_winbase = winbase;
- card->win0base = ioremap(winbase, C101_MAPPED_RAM_SIZE);
- if (!card->win0base) {
- printk(KERN_ERR "c101: could not map I/O addressn");
- c101_destroy_card(card);
- return -EBUSY;
- }
- /* 2 rings required for 1 port */
- card->ring_buffers = (RAM_SIZE -C101_WINDOW_SIZE) / (2 * HDLC_MAX_MRU);
- printk(KERN_DEBUG "c101: using %u packets ringsn",card->ring_buffers);
- card->buff_offset = C101_WINDOW_SIZE; /* Bytes 1D00-1FFF reserved */
- readb(card->win0base + C101_PAGE); /* Resets SCA? */
- udelay(100);
- writeb(0, card->win0base + C101_PAGE);
- writeb(0, card->win0base + C101_DTR); /* Power-up for RAM? */
- sca_init(card, 0);
- spin_lock_init(&card->lock);
- hdlc_to_dev(&card->hdlc)->irq = irq;
- hdlc_to_dev(&card->hdlc)->mem_start = winbase;
- hdlc_to_dev(&card->hdlc)->mem_end = winbase + C101_MAPPED_RAM_SIZE - 1;
- hdlc_to_dev(&card->hdlc)->tx_queue_len = 50;
- card->hdlc.ioctl = c101_ioctl;
- card->hdlc.open = c101_open;
- card->hdlc.close = c101_close;
- card->hdlc.xmit = sca_xmit;
- result = register_hdlc_device(&card->hdlc);
- if (result) {
- printk(KERN_WARNING "c101: unable to register hdlc devicen");
- c101_destroy_card(card);
- return result;
- }
- sca_init_sync_port(card); /* Set up C101 memory */
- *new_card = card;
- new_card = &card->next_card;
- return 0;
- }
- static int __init c101_init(void)
- {
- if (hw == NULL) {
- #ifdef MODULE
- printk(KERN_INFO "c101: no card initializedn");
- #endif
- return -ENOSYS; /* no parameters specified, abort */
- }
- printk(KERN_INFO "%sn", version);
- do {
- unsigned long irq, ram;
- irq = simple_strtoul(hw, &hw, 0);
- if (*hw++ != ',')
- break;
- ram = simple_strtoul(hw, &hw, 0);
- if (*hw == ':' || *hw == 'x0')
- c101_run(irq, ram);
- if (*hw == 'x0')
- return 0;
- }while(*hw++ == ':');
- printk(KERN_ERR "c101: invalid hardware parametersn");
- return first_card ? 0 : -ENOSYS;
- }
- #ifndef MODULE
- static int __init c101_setup(char *str)
- {
- hw = str;
- return 1;
- }
- __setup("c101=", c101_setup);
- #endif
- static void __exit c101_cleanup(void)
- {
- card_t *card = first_card;
- while (card) {
- card_t *ptr = card;
- card = card->next_card;
- unregister_hdlc_device(&ptr->hdlc);
- c101_destroy_card(ptr);
- }
- }
- module_init(c101_init);
- module_exit(c101_cleanup);
- MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
- MODULE_DESCRIPTION("Moxa C101 serial port driver");
- MODULE_LICENSE("GPL");
- MODULE_PARM(hw, "s"); /* hw=irq,ram:irq,... */
- EXPORT_NO_SYMBOLS;