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// SPDX-License-Identifier: GPL-2.0-only
/*
* Cyclades PC300 synchronous serial card driver for Linux
*
* Copyright (C) 2000-2008 Krzysztof Halasa <khc@pm.waw.pl>
*
* For information see <http://www.kernel.org/pub/linux/utils/net/hdlc/>.
*
* Sources of information:
* Hitachi HD64572 SCA-II User's Manual
* Original Cyclades PC300 Linux driver
*
* This driver currently supports only PC300/RSV (V.24/V.35) and
* PC300/X21 cards.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/moduleparam.h>
#include <linux/netdevice.h>
#include <linux/hdlc.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <asm/io.h>
#include "hd64572.h"
#undef DEBUG_PKT
#define DEBUG_RINGS
#define PC300_PLX_SIZE 0x80 /* PLX control window size (128 B) */
#define PC300_SCA_SIZE 0x400 /* SCA window size (1 KB) */
#define MAX_TX_BUFFERS 10
static int pci_clock_freq = 33000000;
static int use_crystal_clock = 0;
static unsigned int CLOCK_BASE;
/* Masks to access the init_ctrl PLX register */
#define PC300_CLKSEL_MASK (0x00000004UL)
#define PC300_CHMEDIA_MASK(port) (0x00000020UL << ((port) * 3))
#define PC300_CTYPE_MASK (0x00000800UL)
enum { PC300_RSV = 1, PC300_X21, PC300_TE }; /* card types */
/*
* PLX PCI9050-1 local configuration and shared runtime registers.
* This structure can be used to access 9050 registers (memory mapped).
*/
typedef struct {
u32 loc_addr_range[4]; /* 00-0Ch : Local Address Ranges */
u32 loc_rom_range; /* 10h : Local ROM Range */
u32 loc_addr_base[4]; /* 14-20h : Local Address Base Addrs */
u32 loc_rom_base; /* 24h : Local ROM Base */
u32 loc_bus_descr[4]; /* 28-34h : Local Bus Descriptors */
u32 rom_bus_descr; /* 38h : ROM Bus Descriptor */
u32 cs_base[4]; /* 3C-48h : Chip Select Base Addrs */
u32 intr_ctrl_stat; /* 4Ch : Interrupt Control/Status */
u32 init_ctrl; /* 50h : EEPROM ctrl, Init Ctrl, etc */
}plx9050;
typedef struct port_s {
struct napi_struct napi;
struct net_device *netdev;
struct card_s *card;
spinlock_t lock; /* TX lock */
sync_serial_settings settings;
int rxpart; /* partial frame received, next frame invalid*/
unsigned short encoding;
unsigned short parity;
unsigned int iface;
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 chan; /* physical port # - 0 or 1 */
}port_t;
typedef struct card_s {
int type; /* RSV, X21, etc. */
int n_ports; /* 1 or 2 ports */
u8 __iomem *rambase; /* buffer memory base (virtual) */
u8 __iomem *scabase; /* SCA memory base (virtual) */
plx9050 __iomem *plxbase; /* PLX registers memory base (virtual) */
u32 init_ctrl_value; /* Saved value - 9050 bug workaround */
u16 rx_ring_buffers; /* number of buffers in a ring */
u16 tx_ring_buffers;
u16 buff_offset; /* offset of first buffer of first channel */
u8 irq; /* interrupt request level */
port_t ports[2];
}card_t;
#define get_port(card, port) ((port) < (card)->n_ports ? \
(&(card)->ports[port]) : (NULL))
#include "hd64572.c"
static void pc300_set_iface(port_t *port)
{
card_t *card = port->card;
u32 __iomem * init_ctrl = &card->plxbase->init_ctrl;
u16 msci = get_msci(port);
u8 rxs = port->rxs & CLK_BRG_MASK;
u8 txs = port->txs & CLK_BRG_MASK;
sca_out(EXS_TES1, (port->chan ? MSCI1_OFFSET : MSCI0_OFFSET) + EXS,
port->card);
switch(port->settings.clock_type) {
case CLOCK_INT:
rxs |= CLK_BRG; /* BRG output */
txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
break;
case CLOCK_TXINT:
rxs |= CLK_LINE; /* RXC input */
txs |= CLK_PIN_OUT | CLK_BRG; /* BRG output */
break;
case CLOCK_TXFROMRX:
rxs |= CLK_LINE; /* RXC input */
txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
break;
default: /* EXTernal clock */
rxs |= CLK_LINE; /* RXC input */
txs |= CLK_PIN_OUT | CLK_LINE; /* TXC input */
break;
}
port->rxs = rxs;
port->txs = txs;
sca_out(rxs, msci + RXS, card);
sca_out(txs, msci + TXS, card);
sca_set_port(port);
if (port->card->type == PC300_RSV) {
if (port->iface == IF_IFACE_V35)
writel(card->init_ctrl_value |
PC300_CHMEDIA_MASK(port->chan), init_ctrl);
else
writel(card->init_ctrl_value &
~PC300_CHMEDIA_MASK(port->chan), init_ctrl);
}
}
static int pc300_open(struct net_device *dev)
{
port_t *port = dev_to_port(dev);
int result = hdlc_open(dev);
if (result)
return result;
sca_open(dev);
pc300_set_iface(port);
return 0;
}
static int pc300_close(struct net_device *dev)
{
sca_close(dev);
hdlc_close(dev);
return 0;
}
static int pc300_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;
int new_type;
port_t *port = dev_to_port(dev);
#ifdef DEBUG_RINGS
if (cmd == SIOCDEVPRIVATE) {
sca_dump_rings(dev);
return 0;
}
#endif
if (cmd != SIOCWANDEV)
return hdlc_ioctl(dev, ifr, cmd);
if (ifr->ifr_settings.type == IF_GET_IFACE) {
ifr->ifr_settings.type = port->iface;
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;
}
if (port->card->type == PC300_X21 &&
(ifr->ifr_settings.type == IF_IFACE_SYNC_SERIAL ||
ifr->ifr_settings.type == IF_IFACE_X21))
new_type = IF_IFACE_X21;
else if (port->card->type == PC300_RSV &&
(ifr->ifr_settings.type == IF_IFACE_SYNC_SERIAL ||
ifr->ifr_settings.type == IF_IFACE_V35))
new_type = IF_IFACE_V35;
else if (port->card->type == PC300_RSV &&
ifr->ifr_settings.type == IF_IFACE_V24)
new_type = IF_IFACE_V24;
else
return hdlc_ioctl(dev, ifr, cmd);
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
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