diff options
Diffstat (limited to 'drivers/net/wan/c101.c')
| -rw-r--r-- | drivers/net/wan/c101.c | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/drivers/net/wan/c101.c b/drivers/net/wan/c101.c new file mode 100644 index 000000000000..43d854ace233 --- /dev/null +++ b/drivers/net/wan/c101.c @@ -0,0 +1,446 @@ +/* + * Moxa C101 synchronous serial card driver for Linux + * + * Copyright (C) 2000-2003 Krzysztof Halasa <khc@pm.waw.pl> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License + * as published by the Free Software Foundation. + * + * 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/moduleparam.h> +#include <linux/netdevice.h> +#include <linux/hdlc.h> +#include <linux/delay.h> +#include <asm/io.h> + +#include "hd64570.h" + + +static const char* version = "Moxa C101 driver version: 1.15"; +static const char* devname = "C101"; + +#undef DEBUG_PKT +#define DEBUG_RINGS + +#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 TX_RING_BUFFERS 10 +#define RX_RING_BUFFERS ((RAM_SIZE - C101_WINDOW_SIZE) / \ + (sizeof(pkt_desc) + HDLC_MAX_MRU) - TX_RING_BUFFERS) + +#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 { + struct net_device *dev; + spinlock_t lock; /* TX lock */ + u8 __iomem *win0base; /* ISA window base address */ + u32 phy_winbase; /* ISA physical base address */ + sync_serial_settings settings; + int rxpart; /* partial frame received, next frame invalid*/ + unsigned short encoding; + unsigned short parity; + u16 rx_ring_buffers; /* number of buffers in a ring */ + u16 tx_ring_buffers; + u16 buff_offset; /* offset of first buffer of first channel */ + u16 rxin; /* rx ring buffer 'in' pointer */ + u16 txin; /* tx ring buffer 'in' and 'last' pointers */ + u16 txlast; + u8 rxs, txs, tmc; /* SCA registers */ + u8 irq; /* IRQ (3-15) */ + u8 page; + + struct card_s *next_card; +}card_t; + +typedef card_t port_t; + +static card_t *first_card; +static card_t **new_card = &first_card; + + +#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)) + +/* EDA address register must be set in EDAL, EDAH order - 8 bit ISA bus */ +#define sca_outw(value, reg, card) do { \ + writeb(value & 0xFF, (card)->win0base + C101_SCA + (reg)); \ + writeb((value >> 8 ) & 0xFF, (card)->win0base + C101_SCA + (reg+1));\ +} while(0) + +#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) (card) +static void sca_msci_intr(port_t *port); + + +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); +} + + +#include "hd6457x.c" + + +static void sca_msci_intr(port_t *port) +{ + struct net_device *dev = port_to_dev(port); + card_t* card = port_to_card(port); + u8 stat = sca_in(MSCI1_OFFSET + ST1, card); /* read MSCI ST1 status */ + + /* Reset MSCI TX underrun status bit */ + sca_out(stat & ST1_UDRN, MSCI0_OFFSET + ST1, card); + + if (stat & ST1_UDRN) { + struct net_device_stats *stats = hdlc_stats(dev); + stats->tx_errors++; /* TX Underrun error detected */ + stats->tx_fifo_errors++; + } + + /* Reset MSCI CDCD status bit - uses ch#2 DCD input */ + sca_out(stat & ST1_CDCD, MSCI1_OFFSET + ST1, card); + + if (stat & ST1_CDCD) + hdlc_set_carrier(!(sca_in(MSCI1_OFFSET + ST3, card) & ST3_DCD), + dev); +} + + +static void c101_set_iface(port_t *port) +{ + u8 rxs = port->rxs & CLK_BRG_MASK; + u8 txs = port->txs & CLK_BRG_MASK; + + switch(port->settings.clock_type) { + 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: /* EXTernal clock */ + rxs |= CLK_LINE_RX; /* RXC input */ + txs |= CLK_LINE_TX; /* TXC input */ + } + + port->rxs = rxs; + port->txs = txs; + sca_out(rxs, MSCI1_OFFSET + RXS, port); + sca_out(txs, MSCI1_OFFSET + TXS, port); + sca_set_port(port); +} + + +static int c101_open(struct net_device *dev) +{ + port_t *port = dev_to_port(dev); + int result; + + result = hdlc_open(dev); + if (result) + return result; + + writeb(1, port->win0base + C101_DTR); + sca_out(0, MSCI1_OFFSET + CTL, port); /* RTS uses ch#2 output */ + sca_open(dev); + /* DCD is connected to port 2 !@#$%^& - disable MSCI0 CDCD interrupt */ + sca_out(IE1_UDRN, MSCI0_OFFSET + IE1, port); + sca_out(IE0_TXINT, MSCI0_OFFSET + IE0, port); + + hdlc_set_carrier(!(sca_in(MSCI1_OFFSET + ST3, port) & ST3_DCD), dev); + printk(KERN_DEBUG "0x%X\n", sca_in(MSCI1_OFFSET + ST3, port)); + + /* enable MSCI1 CDCD interrupt */ + sca_out(IE1_CDCD, MSCI1_OFFSET + IE1, port); + sca_out(IE0_RXINTA, MSCI1_OFFSET + IE0, port); + sca_out(0x48, IER0, port); /* TXINT #0 and RXINT #1 */ + c101_set_iface(port); + return 0; +} + + +static int c101_close(struct net_device *dev) +{ + port_t *port = dev_to_port(dev); + + sca_close(dev); + writeb(0, port->win0base + C101_DTR); + sca_out(CTL_NORTS, MSCI1_OFFSET + CTL, port); + hdlc_close(dev); + return 0; +} + + +static int c101_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + const size_t size = sizeof(sync_serial_settings); + sync_serial_settings new_line; + sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync; + port_t *port = dev_to_port(dev); + +#ifdef DEBUG_RINGS + if (cmd == SIOCDEVPRIVATE) { + sca_dump_rings(dev); + printk(KERN_DEBUG "MSCI1: ST: %02x %02x %02x %02x\n", + sca_in(MSCI1_OFFSET + ST0, port), + sca_in(MSCI1_OFFSET + ST1, port), + sca_in(MSCI1_OFFSET + ST2, port), + sca_in(MSCI1_OFFSET + ST3, port)); + return 0; + } +#endif + if (cmd != SIOCWANDEV) + return hdlc_ioctl(dev, ifr, cmd); + + switch(ifr->ifr_settings.type) { + case IF_GET_IFACE: + ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL; + if (ifr->ifr_settings.size < size) { + ifr->ifr_settings.size = size; /* data size wanted */ + return -ENOBUFS; + } + if (copy_to_user(line, &port->settings, size)) + return -EFAULT; + return 0; + + case IF_IFACE_SYNC_SERIAL: + if(!capable(CAP_NET_ADMIN)) + return -EPERM; + + if (copy_from_user(&new_line, line, size)) + return -EFAULT; + + if (new_line.clock_type != CLOCK_EXT && + new_line.clock_type != CLOCK_TXFROMRX && + new_line.clock_type != CLOCK_INT && + new_line.clock_type != CLOCK_TXINT) + return -EINVAL; /* No such clock setting */ + + if (new_line.loopback != 0 && new_line.loopback != 1) + return -EINVAL; + + memcpy(&port->settings, &new_line, size); /* Update settings */ + c101_set_iface(port); + return 0; + + default: + return hdlc_ioctl(dev, ifr, cmd); + } +} + + + +static void c101_destroy_card(card_t *card) +{ + readb(card->win0base + C101_PAGE); /* Resets SCA? */ + + if (card->irq) + free_irq(card->irq, card); + + if (card->win0base) { + iounmap(card->win0base); + release_mem_region(card->phy_winbase, C101_MAPPED_RAM_SIZE); + } + + free_netdev(card->dev); + + kfree(card); +} + + + +static int __init c101_run(unsigned long irq, unsigned long winbase) +{ + struct net_device *dev; + hdlc_device *hdlc; + card_t *card; + int result; + + if (irq<3 || irq>15 || irq == 6) /* FIXME */ { + printk(KERN_ERR "c101: invalid IRQ value\n"); + return -ENODEV; + } + + if (winbase < 0xC0000 || winbase > 0xDFFFF || (winbase & 0x3FFF) !=0) { + printk(KERN_ERR "c101: invalid RAM value\n"); + return -ENODEV; + } + + card = kmalloc(sizeof(card_t), GFP_KERNEL); + if (card == NULL) { + printk(KERN_ERR "c101: unable to allocate memory\n"); + return -ENOBUFS; + } + memset(card, 0, sizeof(card_t)); + + card->dev = alloc_hdlcdev(card); + if (!card->dev) { + printk(KERN_ERR "c101: unable to allocate memory\n"); + kfree(card); + return -ENOBUFS; + } + + if (request_irq(irq, sca_intr, 0, devname, card)) { + printk(KERN_ERR "c101: could not allocate IRQ\n"); + 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 window\n"); + 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 address\n"); + c101_destroy_card(card); + return -EBUSY; + } + + card->tx_ring_buffers = TX_RING_BUFFERS; + card->rx_ring_buffers = RX_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); + + dev = port_to_dev(card); + hdlc = dev_to_hdlc(dev); + + spin_lock_init(&card->lock); + SET_MODULE_OWNER(dev); + dev->irq = irq; + dev->mem_start = winbase; + dev->mem_end = winbase + C101_MAPPED_RAM_SIZE - 1; + dev->tx_queue_len = 50; + dev->do_ioctl = c101_ioctl; + dev->open = c101_open; + dev->stop = c101_close; + hdlc->attach = sca_attach; + hdlc->xmit = sca_xmit; + card->settings.clock_type = CLOCK_EXT; + + result = register_hdlc_device(dev); + if (result) { + printk(KERN_WARNING "c101: unable to register hdlc device\n"); + c101_destroy_card(card); + return result; + } + + sca_init_sync_port(card); /* Set up C101 memory */ + hdlc_set_carrier(!(sca_in(MSCI1_OFFSET + ST3, card) & ST3_DCD), dev); + + printk(KERN_INFO "%s: Moxa C101 on IRQ%u," + " using %u TX + %u RX packets rings\n", + dev->name, card->irq, + card->tx_ring_buffers, card->rx_ring_buffers); + + *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 initialized\n"); +#endif + return -ENOSYS; /* no parameters specified, abort */ + } + + printk(KERN_INFO "%s\n", 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 first_card ? 0 : -ENOSYS; + }while(*hw++ == ':'); + + printk(KERN_ERR "c101: invalid hardware parameters\n"); + return first_card ? 0 : -ENOSYS; +} + + +static void __exit c101_cleanup(void) +{ + card_t *card = first_card; + + while (card) { + card_t *ptr = card; + card = card->next_card; + unregister_hdlc_device(port_to_dev(ptr)); + 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 v2"); +module_param(hw, charp, 0444); /* hw=irq,ram:irq,... */ |