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,... */