/*
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* Cyclades PC300 synchronous serial card driver for Linux
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*
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* Copyright (C) 2000-2008 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* For information see <http://www.kernel.org/pub/linux/utils/net/hdlc/>.
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*
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* Sources of information:
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* Hitachi HD64572 SCA-II User's Manual
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* Original Cyclades PC300 Linux driver
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*
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* This driver currently supports only PC300/RSV (V.24/V.35) and
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* PC300/X21 cards.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/in.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/moduleparam.h>
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#include <linux/netdevice.h>
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#include <linux/hdlc.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include "hd64572.h"
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#undef DEBUG_PKT
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#define DEBUG_RINGS
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#define PC300_PLX_SIZE 0x80 /* PLX control window size (128 B) */
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#define PC300_SCA_SIZE 0x400 /* SCA window size (1 KB) */
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#define MAX_TX_BUFFERS 10
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static int pci_clock_freq = 33000000;
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static int use_crystal_clock = 0;
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static unsigned int CLOCK_BASE;
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/* Masks to access the init_ctrl PLX register */
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#define PC300_CLKSEL_MASK (0x00000004UL)
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#define PC300_CHMEDIA_MASK(port) (0x00000020UL << ((port) * 3))
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#define PC300_CTYPE_MASK (0x00000800UL)
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enum { PC300_RSV = 1, PC300_X21, PC300_TE }; /* card types */
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/*
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* PLX PCI9050-1 local configuration and shared runtime registers.
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* This structure can be used to access 9050 registers (memory mapped).
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*/
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typedef struct {
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u32 loc_addr_range[4]; /* 00-0Ch : Local Address Ranges */
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u32 loc_rom_range; /* 10h : Local ROM Range */
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u32 loc_addr_base[4]; /* 14-20h : Local Address Base Addrs */
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u32 loc_rom_base; /* 24h : Local ROM Base */
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u32 loc_bus_descr[4]; /* 28-34h : Local Bus Descriptors */
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u32 rom_bus_descr; /* 38h : ROM Bus Descriptor */
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u32 cs_base[4]; /* 3C-48h : Chip Select Base Addrs */
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u32 intr_ctrl_stat; /* 4Ch : Interrupt Control/Status */
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u32 init_ctrl; /* 50h : EEPROM ctrl, Init Ctrl, etc */
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}plx9050;
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typedef struct port_s {
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struct napi_struct napi;
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struct net_device *netdev;
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struct card_s *card;
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spinlock_t lock; /* TX lock */
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sync_serial_settings settings;
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int rxpart; /* partial frame received, next frame invalid*/
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unsigned short encoding;
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unsigned short parity;
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unsigned int iface;
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u16 rxin; /* rx ring buffer 'in' pointer */
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u16 txin; /* tx ring buffer 'in' and 'last' pointers */
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u16 txlast;
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u8 rxs, txs, tmc; /* SCA registers */
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u8 chan; /* physical port # - 0 or 1 */
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}port_t;
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typedef struct card_s {
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int type; /* RSV, X21, etc. */
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int n_ports; /* 1 or 2 ports */
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u8 __iomem *rambase; /* buffer memory base (virtual) */
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u8 __iomem *scabase; /* SCA memory base (virtual) */
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plx9050 __iomem *plxbase; /* PLX registers memory base (virtual) */
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u32 init_ctrl_value; /* Saved value - 9050 bug workaround */
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u16 rx_ring_buffers; /* number of buffers in a ring */
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u16 tx_ring_buffers;
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u16 buff_offset; /* offset of first buffer of first channel */
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u8 irq; /* interrupt request level */
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port_t ports[2];
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}card_t;
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#define get_port(card, port) ((port) < (card)->n_ports ? \
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(&(card)->ports[port]) : (NULL))
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#include "hd64572.c"
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static void pc300_set_iface(port_t *port)
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{
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card_t *card = port->card;
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u32 __iomem * init_ctrl = &card->plxbase->init_ctrl;
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u16 msci = get_msci(port);
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u8 rxs = port->rxs & CLK_BRG_MASK;
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u8 txs = port->txs & CLK_BRG_MASK;
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sca_out(EXS_TES1, (port->chan ? MSCI1_OFFSET : MSCI0_OFFSET) + EXS,
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port->card);
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switch(port->settings.clock_type) {
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case CLOCK_INT:
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rxs |= CLK_BRG; /* BRG output */
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txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
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break;
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case CLOCK_TXINT:
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rxs |= CLK_LINE; /* RXC input */
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txs |= CLK_PIN_OUT | CLK_BRG; /* BRG output */
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break;
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case CLOCK_TXFROMRX:
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rxs |= CLK_LINE; /* RXC input */
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txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
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break;
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default: /* EXTernal clock */
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rxs |= CLK_LINE; /* RXC input */
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txs |= CLK_PIN_OUT | CLK_LINE; /* TXC input */
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break;
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}
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port->rxs = rxs;
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port->txs = txs;
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sca_out(rxs, msci + RXS, card);
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sca_out(txs, msci + TXS, card);
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sca_set_port(port);
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if (port->card->type == PC300_RSV) {
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if (port->iface == IF_IFACE_V35)
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writel(card->init_ctrl_value |
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PC300_CHMEDIA_MASK(port->chan), init_ctrl);
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else
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writel(card->init_ctrl_value &
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~PC300_CHMEDIA_MASK(port->chan), init_ctrl);
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}
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}
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static int pc300_open(struct net_device *dev)
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{
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port_t *port = dev_to_port(dev);
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int result = hdlc_open(dev);
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if (result)
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return result;
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sca_open(dev);
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pc300_set_iface(port);
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return 0;
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}
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static int pc300_close(struct net_device *dev)
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{
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sca_close(dev);
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hdlc_close(dev);
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return 0;
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}
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static int pc300_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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{
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const size_t size = sizeof(sync_serial_settings);
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sync_serial_settings new_line;
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sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
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int new_type;
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port_t *port = dev_to_port(dev);
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#ifdef DEBUG_RINGS
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if (cmd == SIOCDEVPRIVATE) {
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sca_dump_rings(dev);
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return 0;
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}
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#endif
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if (cmd != SIOCWANDEV)
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return hdlc_ioctl(dev, ifr, cmd);
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if (ifr->ifr_settings.type == IF_GET_IFACE) {
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ifr->ifr_settings.type = port->iface;
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if (ifr->ifr_settings.size < size) {
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ifr->ifr_settings.size = size; /* data size wanted */
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return -ENOBUFS;
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}
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if (copy_to_user(line, &port->settings, size))
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return -EFAULT;
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return 0;
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}
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if (port->card->type == PC300_X21 &&
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(ifr->ifr_settings.type == IF_IFACE_SYNC_SERIAL ||
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ifr->ifr_settings.type == IF_IFACE_X21))
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new_type = IF_IFACE_X21;
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else if (port->card->type == PC300_RSV &&
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(ifr->ifr_settings.type == IF_IFACE_SYNC_SERIAL ||
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ifr->ifr_settings.type == IF_IFACE_V35))
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new_type = IF_IFACE_V35;
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else if (port->card->type == PC300_RSV &&
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ifr->ifr_settings.type == IF_IFACE_V24)
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new_type = IF_IFACE_V24;
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else
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return hdlc_ioctl(dev, ifr, cmd);
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (copy_from_user(&new_line, line, size))
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return -EFAULT;
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if (new_line.clock_type != CLOCK_EXT &&
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new_line.clock_type != CLOCK_TXFROMRX &&
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new_line.clock_type != CLOCK_INT &&
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new_line.clock_type != CLOCK_TXINT)
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return -EINVAL; /* No such clock setting */
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if (new_line.loopback != 0 && new_line.loopback != 1)
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return -EINVAL;
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memcpy(&port->settings, &new_line, size); /* Update settings */
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port->iface = new_type;
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pc300_set_iface(port);
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return 0;
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}
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static void pc300_pci_remove_one(struct pci_dev *pdev)
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{
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int i;
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card_t *card = pci_get_drvdata(pdev);
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for (i = 0; i < 2; i++)
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if (card->ports[i].card)
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unregister_hdlc_device(card->ports[i].netdev);
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if (card->irq)
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free_irq(card->irq, card);
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if (card->rambase)
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iounmap(card->rambase);
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if (card->scabase)
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iounmap(card->scabase);
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if (card->plxbase)
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iounmap(card->plxbase);
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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if (card->ports[0].netdev)
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free_netdev(card->ports[0].netdev);
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if (card->ports[1].netdev)
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free_netdev(card->ports[1].netdev);
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kfree(card);
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}
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static const struct net_device_ops pc300_ops = {
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.ndo_open = pc300_open,
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.ndo_stop = pc300_close,
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.ndo_start_xmit = hdlc_start_xmit,
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.ndo_do_ioctl = pc300_ioctl,
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};
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static int pc300_pci_init_one(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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card_t *card;
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u32 __iomem *p;
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int i;
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u32 ramsize;
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u32 ramphys; /* buffer memory base */
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u32 scaphys; /* SCA memory base */
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u32 plxphys; /* PLX registers memory base */
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i = pci_enable_device(pdev);
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if (i)
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return i;
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i = pci_request_regions(pdev, "PC300");
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if (i) {
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pci_disable_device(pdev);
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return i;
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}
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card = kzalloc(sizeof(card_t), GFP_KERNEL);
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if (card == NULL) {
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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return -ENOBUFS;
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}
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pci_set_drvdata(pdev, card);
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if (pci_resource_len(pdev, 0) != PC300_PLX_SIZE ||
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pci_resource_len(pdev, 2) != PC300_SCA_SIZE ||
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pci_resource_len(pdev, 3) < 16384) {
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pr_err("invalid card EEPROM parameters\n");
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pc300_pci_remove_one(pdev);
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return -EFAULT;
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}
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plxphys = pci_resource_start(pdev, 0) & PCI_BASE_ADDRESS_MEM_MASK;
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card->plxbase = ioremap(plxphys, PC300_PLX_SIZE);
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scaphys = pci_resource_start(pdev, 2) & PCI_BASE_ADDRESS_MEM_MASK;
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card->scabase = ioremap(scaphys, PC300_SCA_SIZE);
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ramphys = pci_resource_start(pdev, 3) & PCI_BASE_ADDRESS_MEM_MASK;
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card->rambase = pci_ioremap_bar(pdev, 3);
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if (card->plxbase == NULL ||
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card->scabase == NULL ||
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card->rambase == NULL) {
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pr_err("ioremap() failed\n");
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pc300_pci_remove_one(pdev);
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return -ENOMEM;
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}
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/* PLX PCI 9050 workaround for local configuration register read bug */
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pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, scaphys);
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card->init_ctrl_value = readl(&((plx9050 __iomem *)card->scabase)->init_ctrl);
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pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, plxphys);
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if (pdev->device == PCI_DEVICE_ID_PC300_TE_1 ||
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pdev->device == PCI_DEVICE_ID_PC300_TE_2)
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card->type = PC300_TE; /* not fully supported */
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else if (card->init_ctrl_value & PC300_CTYPE_MASK)
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card->type = PC300_X21;
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else
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card->type = PC300_RSV;
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if (pdev->device == PCI_DEVICE_ID_PC300_RX_1 ||
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pdev->device == PCI_DEVICE_ID_PC300_TE_1)
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card->n_ports = 1;
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else
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card->n_ports = 2;
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for (i = 0; i < card->n_ports; i++)
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if (!(card->ports[i].netdev = alloc_hdlcdev(&card->ports[i]))) {
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pr_err("unable to allocate memory\n");
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pc300_pci_remove_one(pdev);
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return -ENOMEM;
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}
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/* Reset PLX */
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p = &card->plxbase->init_ctrl;
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writel(card->init_ctrl_value | 0x40000000, p);
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readl(p); /* Flush the write - do not use sca_flush */
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udelay(1);
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writel(card->init_ctrl_value, p);
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readl(p); /* Flush the write - do not use sca_flush */
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udelay(1);
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/* Reload Config. Registers from EEPROM */
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writel(card->init_ctrl_value | 0x20000000, p);
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readl(p); /* Flush the write - do not use sca_flush */
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udelay(1);
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writel(card->init_ctrl_value, p);
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readl(p); /* Flush the write - do not use sca_flush */
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udelay(1);
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ramsize = sca_detect_ram(card, card->rambase,
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pci_resource_len(pdev, 3));
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if (use_crystal_clock)
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card->init_ctrl_value &= ~PC300_CLKSEL_MASK;
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else
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card->init_ctrl_value |= PC300_CLKSEL_MASK;
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writel(card->init_ctrl_value, &card->plxbase->init_ctrl);
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/* number of TX + RX buffers for one port */
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i = ramsize / (card->n_ports * (sizeof(pkt_desc) + HDLC_MAX_MRU));
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card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS);
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card->rx_ring_buffers = i - card->tx_ring_buffers;
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card->buff_offset = card->n_ports * sizeof(pkt_desc) *
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(card->tx_ring_buffers + card->rx_ring_buffers);
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pr_info("PC300/%s, %u KB RAM at 0x%x, IRQ%u, using %u TX + %u RX packets rings\n",
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card->type == PC300_X21 ? "X21" :
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card->type == PC300_TE ? "TE" : "RSV",
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ramsize / 1024, ramphys, pdev->irq,
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card->tx_ring_buffers, card->rx_ring_buffers);
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if (card->tx_ring_buffers < 1) {
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pr_err("RAM test failed\n");
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pc300_pci_remove_one(pdev);
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return -EFAULT;
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}
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/* Enable interrupts on the PCI bridge, LINTi1 active low */
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writew(0x0041, &card->plxbase->intr_ctrl_stat);
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/* Allocate IRQ */
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if (request_irq(pdev->irq, sca_intr, IRQF_SHARED, "pc300", card)) {
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pr_warn("could not allocate IRQ%d\n", pdev->irq);
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pc300_pci_remove_one(pdev);
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return -EBUSY;
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}
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card->irq = pdev->irq;
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sca_init(card, 0);
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// COTE not set - allows better TX DMA settings
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// sca_out(sca_in(PCR, card) | PCR_COTE, PCR, card);
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sca_out(0x10, BTCR, card);
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for (i = 0; i < card->n_ports; i++) {
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port_t *port = &card->ports[i];
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struct net_device *dev = port->netdev;
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hdlc_device *hdlc = dev_to_hdlc(dev);
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port->chan = i;
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spin_lock_init(&port->lock);
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dev->irq = card->irq;
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dev->mem_start = ramphys;
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dev->mem_end = ramphys + ramsize - 1;
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dev->tx_queue_len = 50;
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dev->netdev_ops = &pc300_ops;
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hdlc->attach = sca_attach;
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hdlc->xmit = sca_xmit;
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port->settings.clock_type = CLOCK_EXT;
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port->card = card;
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if (card->type == PC300_X21)
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port->iface = IF_IFACE_X21;
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else
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port->iface = IF_IFACE_V35;
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sca_init_port(port);
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if (register_hdlc_device(dev)) {
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pr_err("unable to register hdlc device\n");
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port->card = NULL;
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pc300_pci_remove_one(pdev);
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return -ENOBUFS;
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}
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netdev_info(dev, "PC300 channel %d\n", port->chan);
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}
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return 0;
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}
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static const struct pci_device_id pc300_pci_tbl[] = {
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{ PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_RX_1, PCI_ANY_ID,
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PCI_ANY_ID, 0, 0, 0 },
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{ PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_RX_2, PCI_ANY_ID,
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PCI_ANY_ID, 0, 0, 0 },
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{ PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_TE_1, PCI_ANY_ID,
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PCI_ANY_ID, 0, 0, 0 },
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{ PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_TE_2, PCI_ANY_ID,
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PCI_ANY_ID, 0, 0, 0 },
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{ 0, }
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};
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static struct pci_driver pc300_pci_driver = {
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.name = "PC300",
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.id_table = pc300_pci_tbl,
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.probe = pc300_pci_init_one,
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.remove = pc300_pci_remove_one,
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};
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static int __init pc300_init_module(void)
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{
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if (pci_clock_freq < 1000000 || pci_clock_freq > 80000000) {
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pr_err("Invalid PCI clock frequency\n");
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return -EINVAL;
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}
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if (use_crystal_clock != 0 && use_crystal_clock != 1) {
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pr_err("Invalid 'use_crystal_clock' value\n");
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return -EINVAL;
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}
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CLOCK_BASE = use_crystal_clock ? 24576000 : pci_clock_freq;
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return pci_register_driver(&pc300_pci_driver);
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}
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static void __exit pc300_cleanup_module(void)
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{
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pci_unregister_driver(&pc300_pci_driver);
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}
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MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
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MODULE_DESCRIPTION("Cyclades PC300 serial port driver");
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MODULE_LICENSE("GPL v2");
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MODULE_DEVICE_TABLE(pci, pc300_pci_tbl);
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module_param(pci_clock_freq, int, 0444);
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MODULE_PARM_DESC(pci_clock_freq, "System PCI clock frequency in Hz");
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module_param(use_crystal_clock, int, 0444);
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MODULE_PARM_DESC(use_crystal_clock,
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"Use 24.576 MHz clock instead of PCI clock");
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module_init(pc300_init_module);
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module_exit(pc300_cleanup_module);
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