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linux/drivers/net/hamradio/yam.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

1201 lines
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/*****************************************************************************/
/*
* yam.c -- YAM radio modem driver.
*
* Copyright (C) 1998 Frederic Rible F1OAT (frible@teaser.fr)
* Adapted from baycom.c driver written by Thomas Sailer (sailer@ife.ee.ethz.ch)
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Please note that the GPL allows you to use the driver, NOT the radio.
* In order to use the radio, you need a license from the communications
* authority of your country.
*
*
* History:
* 0.0 F1OAT 06.06.98 Begin of work with baycom.c source code V 0.3
* 0.1 F1OAT 07.06.98 Add timer polling routine for channel arbitration
* 0.2 F6FBB 08.06.98 Added delay after FPGA programming
* 0.3 F6FBB 29.07.98 Delayed PTT implementation for dupmode=2
* 0.4 F6FBB 30.07.98 Added TxTail, Slottime and Persistance
* 0.5 F6FBB 01.08.98 Shared IRQs, /proc/net and network statistics
* 0.6 F6FBB 25.08.98 Added 1200Bds format
* 0.7 F6FBB 12.09.98 Added to the kernel configuration
* 0.8 F6FBB 14.10.98 Fixed slottime/persistence timing bug
* OK1ZIA 2.09.01 Fixed "kfree_skb on hard IRQ"
* using dev_kfree_skb_any(). (important in 2.4 kernel)
*
*/
/*****************************************************************************/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/system.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/ax25.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#include <linux/yam.h>
#include "yam9600.h"
#include "yam1200.h"
/* --------------------------------------------------------------------- */
static const char yam_drvname[] = "yam";
static char yam_drvinfo[] __initdata = KERN_INFO "YAM driver version 0.8 by F1OAT/F6FBB\n";
/* --------------------------------------------------------------------- */
#define YAM_9600 1
#define YAM_1200 2
#define NR_PORTS 4
#define YAM_MAGIC 0xF10A7654
/* Transmitter states */
#define TX_OFF 0
#define TX_HEAD 1
#define TX_DATA 2
#define TX_CRC1 3
#define TX_CRC2 4
#define TX_TAIL 5
#define YAM_MAX_FRAME 1024
#define DEFAULT_BITRATE 9600 /* bps */
#define DEFAULT_HOLDD 10 /* sec */
#define DEFAULT_TXD 300 /* ms */
#define DEFAULT_TXTAIL 10 /* ms */
#define DEFAULT_SLOT 100 /* ms */
#define DEFAULT_PERS 64 /* 0->255 */
struct yam_port {
int magic;
int bitrate;
int baudrate;
int iobase;
int irq;
int dupmode;
struct net_device *dev;
/* Stats section */
struct net_device_stats stats;
int nb_rxint;
int nb_mdint;
/* Parameters section */
int txd; /* tx delay */
int holdd; /* duplex ptt delay */
int txtail; /* txtail delay */
int slot; /* slottime */
int pers; /* persistence */
/* Tx section */
int tx_state;
int tx_count;
int slotcnt;
unsigned char tx_buf[YAM_MAX_FRAME];
int tx_len;
int tx_crcl, tx_crch;
struct sk_buff_head send_queue; /* Packets awaiting transmission */
/* Rx section */
int dcd;
unsigned char rx_buf[YAM_MAX_FRAME];
int rx_len;
int rx_crcl, rx_crch;
};
struct yam_mcs {
unsigned char bits[YAM_FPGA_SIZE];
int bitrate;
struct yam_mcs *next;
};
static struct net_device *yam_devs[NR_PORTS];
static struct yam_mcs *yam_data;
static char ax25_bcast[7] =
{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
static char ax25_test[7] =
{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
static DEFINE_TIMER(yam_timer, NULL, 0, 0);
/* --------------------------------------------------------------------- */
#define RBR(iobase) (iobase+0)
#define THR(iobase) (iobase+0)
#define IER(iobase) (iobase+1)
#define IIR(iobase) (iobase+2)
#define FCR(iobase) (iobase+2)
#define LCR(iobase) (iobase+3)
#define MCR(iobase) (iobase+4)
#define LSR(iobase) (iobase+5)
#define MSR(iobase) (iobase+6)
#define SCR(iobase) (iobase+7)
#define DLL(iobase) (iobase+0)
#define DLM(iobase) (iobase+1)
#define YAM_EXTENT 8
/* Interrupt Identification Register Bit Masks */
#define IIR_NOPEND 1
#define IIR_MSR 0
#define IIR_TX 2
#define IIR_RX 4
#define IIR_LSR 6
#define IIR_TIMEOUT 12 /* Fifo mode only */
#define IIR_MASK 0x0F
/* Interrupt Enable Register Bit Masks */
#define IER_RX 1 /* enable rx interrupt */
#define IER_TX 2 /* enable tx interrupt */
#define IER_LSR 4 /* enable line status interrupts */
#define IER_MSR 8 /* enable modem status interrupts */
/* Modem Control Register Bit Masks */
#define MCR_DTR 0x01 /* DTR output */
#define MCR_RTS 0x02 /* RTS output */
#define MCR_OUT1 0x04 /* OUT1 output (not accessible in RS232) */
#define MCR_OUT2 0x08 /* Master Interrupt enable (must be set on PCs) */
#define MCR_LOOP 0x10 /* Loopback enable */
/* Modem Status Register Bit Masks */
#define MSR_DCTS 0x01 /* Delta CTS input */
#define MSR_DDSR 0x02 /* Delta DSR */
#define MSR_DRIN 0x04 /* Delta RI */
#define MSR_DDCD 0x08 /* Delta DCD */
#define MSR_CTS 0x10 /* CTS input */
#define MSR_DSR 0x20 /* DSR input */
#define MSR_RING 0x40 /* RI input */
#define MSR_DCD 0x80 /* DCD input */
/* line status register bit mask */
#define LSR_RXC 0x01
#define LSR_OE 0x02
#define LSR_PE 0x04
#define LSR_FE 0x08
#define LSR_BREAK 0x10
#define LSR_THRE 0x20
#define LSR_TSRE 0x40
/* Line Control Register Bit Masks */
#define LCR_DLAB 0x80
#define LCR_BREAK 0x40
#define LCR_PZERO 0x28
#define LCR_PEVEN 0x18
#define LCR_PODD 0x08
#define LCR_STOP1 0x00
#define LCR_STOP2 0x04
#define LCR_BIT5 0x00
#define LCR_BIT6 0x02
#define LCR_BIT7 0x01
#define LCR_BIT8 0x03
/* YAM Modem <-> UART Port mapping */
#define TX_RDY MSR_DCTS /* transmitter ready to send */
#define RX_DCD MSR_DCD /* carrier detect */
#define RX_FLAG MSR_RING /* hdlc flag received */
#define FPGA_DONE MSR_DSR /* FPGA is configured */
#define PTT_ON (MCR_RTS|MCR_OUT2) /* activate PTT */
#define PTT_OFF (MCR_DTR|MCR_OUT2) /* release PTT */
#define ENABLE_RXINT IER_RX /* enable uart rx interrupt during rx */
#define ENABLE_TXINT IER_MSR /* enable uart ms interrupt during tx */
#define ENABLE_RTXINT (IER_RX|IER_MSR) /* full duplex operations */
/*************************************************************************
* CRC Tables
************************************************************************/
static const unsigned char chktabl[256] =
{0x00, 0x89, 0x12, 0x9b, 0x24, 0xad, 0x36, 0xbf, 0x48, 0xc1, 0x5a, 0xd3, 0x6c, 0xe5, 0x7e,
0xf7, 0x81, 0x08, 0x93, 0x1a, 0xa5, 0x2c, 0xb7, 0x3e, 0xc9, 0x40, 0xdb, 0x52, 0xed, 0x64,
0xff, 0x76, 0x02, 0x8b, 0x10, 0x99, 0x26, 0xaf, 0x34, 0xbd, 0x4a, 0xc3, 0x58, 0xd1, 0x6e,
0xe7, 0x7c, 0xf5, 0x83, 0x0a, 0x91, 0x18, 0xa7, 0x2e, 0xb5, 0x3c, 0xcb, 0x42, 0xd9, 0x50,
0xef, 0x66, 0xfd, 0x74, 0x04, 0x8d, 0x16, 0x9f, 0x20, 0xa9, 0x32, 0xbb, 0x4c, 0xc5, 0x5e,
0xd7, 0x68, 0xe1, 0x7a, 0xf3, 0x85, 0x0c, 0x97, 0x1e, 0xa1, 0x28, 0xb3, 0x3a, 0xcd, 0x44,
0xdf, 0x56, 0xe9, 0x60, 0xfb, 0x72, 0x06, 0x8f, 0x14, 0x9d, 0x22, 0xab, 0x30, 0xb9, 0x4e,
0xc7, 0x5c, 0xd5, 0x6a, 0xe3, 0x78, 0xf1, 0x87, 0x0e, 0x95, 0x1c, 0xa3, 0x2a, 0xb1, 0x38,
0xcf, 0x46, 0xdd, 0x54, 0xeb, 0x62, 0xf9, 0x70, 0x08, 0x81, 0x1a, 0x93, 0x2c, 0xa5, 0x3e,
0xb7, 0x40, 0xc9, 0x52, 0xdb, 0x64, 0xed, 0x76, 0xff, 0x89, 0x00, 0x9b, 0x12, 0xad, 0x24,
0xbf, 0x36, 0xc1, 0x48, 0xd3, 0x5a, 0xe5, 0x6c, 0xf7, 0x7e, 0x0a, 0x83, 0x18, 0x91, 0x2e,
0xa7, 0x3c, 0xb5, 0x42, 0xcb, 0x50, 0xd9, 0x66, 0xef, 0x74, 0xfd, 0x8b, 0x02, 0x99, 0x10,
0xaf, 0x26, 0xbd, 0x34, 0xc3, 0x4a, 0xd1, 0x58, 0xe7, 0x6e, 0xf5, 0x7c, 0x0c, 0x85, 0x1e,
0x97, 0x28, 0xa1, 0x3a, 0xb3, 0x44, 0xcd, 0x56, 0xdf, 0x60, 0xe9, 0x72, 0xfb, 0x8d, 0x04,
0x9f, 0x16, 0xa9, 0x20, 0xbb, 0x32, 0xc5, 0x4c, 0xd7, 0x5e, 0xe1, 0x68, 0xf3, 0x7a, 0x0e,
0x87, 0x1c, 0x95, 0x2a, 0xa3, 0x38, 0xb1, 0x46, 0xcf, 0x54, 0xdd, 0x62, 0xeb, 0x70, 0xf9,
0x8f, 0x06, 0x9d, 0x14, 0xab, 0x22, 0xb9, 0x30, 0xc7, 0x4e, 0xd5, 0x5c, 0xe3, 0x6a, 0xf1,
0x78};
static const unsigned char chktabh[256] =
{0x00, 0x11, 0x23, 0x32, 0x46, 0x57, 0x65, 0x74, 0x8c, 0x9d, 0xaf, 0xbe, 0xca, 0xdb, 0xe9,
0xf8, 0x10, 0x01, 0x33, 0x22, 0x56, 0x47, 0x75, 0x64, 0x9c, 0x8d, 0xbf, 0xae, 0xda, 0xcb,
0xf9, 0xe8, 0x21, 0x30, 0x02, 0x13, 0x67, 0x76, 0x44, 0x55, 0xad, 0xbc, 0x8e, 0x9f, 0xeb,
0xfa, 0xc8, 0xd9, 0x31, 0x20, 0x12, 0x03, 0x77, 0x66, 0x54, 0x45, 0xbd, 0xac, 0x9e, 0x8f,
0xfb, 0xea, 0xd8, 0xc9, 0x42, 0x53, 0x61, 0x70, 0x04, 0x15, 0x27, 0x36, 0xce, 0xdf, 0xed,
0xfc, 0x88, 0x99, 0xab, 0xba, 0x52, 0x43, 0x71, 0x60, 0x14, 0x05, 0x37, 0x26, 0xde, 0xcf,
0xfd, 0xec, 0x98, 0x89, 0xbb, 0xaa, 0x63, 0x72, 0x40, 0x51, 0x25, 0x34, 0x06, 0x17, 0xef,
0xfe, 0xcc, 0xdd, 0xa9, 0xb8, 0x8a, 0x9b, 0x73, 0x62, 0x50, 0x41, 0x35, 0x24, 0x16, 0x07,
0xff, 0xee, 0xdc, 0xcd, 0xb9, 0xa8, 0x9a, 0x8b, 0x84, 0x95, 0xa7, 0xb6, 0xc2, 0xd3, 0xe1,
0xf0, 0x08, 0x19, 0x2b, 0x3a, 0x4e, 0x5f, 0x6d, 0x7c, 0x94, 0x85, 0xb7, 0xa6, 0xd2, 0xc3,
0xf1, 0xe0, 0x18, 0x09, 0x3b, 0x2a, 0x5e, 0x4f, 0x7d, 0x6c, 0xa5, 0xb4, 0x86, 0x97, 0xe3,
0xf2, 0xc0, 0xd1, 0x29, 0x38, 0x0a, 0x1b, 0x6f, 0x7e, 0x4c, 0x5d, 0xb5, 0xa4, 0x96, 0x87,
0xf3, 0xe2, 0xd0, 0xc1, 0x39, 0x28, 0x1a, 0x0b, 0x7f, 0x6e, 0x5c, 0x4d, 0xc6, 0xd7, 0xe5,
0xf4, 0x80, 0x91, 0xa3, 0xb2, 0x4a, 0x5b, 0x69, 0x78, 0x0c, 0x1d, 0x2f, 0x3e, 0xd6, 0xc7,
0xf5, 0xe4, 0x90, 0x81, 0xb3, 0xa2, 0x5a, 0x4b, 0x79, 0x68, 0x1c, 0x0d, 0x3f, 0x2e, 0xe7,
0xf6, 0xc4, 0xd5, 0xa1, 0xb0, 0x82, 0x93, 0x6b, 0x7a, 0x48, 0x59, 0x2d, 0x3c, 0x0e, 0x1f,
0xf7, 0xe6, 0xd4, 0xc5, 0xb1, 0xa0, 0x92, 0x83, 0x7b, 0x6a, 0x58, 0x49, 0x3d, 0x2c, 0x1e,
0x0f};
/*************************************************************************
* FPGA functions
************************************************************************/
static void delay(int ms)
{
unsigned long timeout = jiffies + ((ms * HZ) / 1000);
while (time_before(jiffies, timeout))
cpu_relax();
}
/*
* reset FPGA
*/
static void fpga_reset(int iobase)
{
outb(0, IER(iobase));
outb(LCR_DLAB | LCR_BIT5, LCR(iobase));
outb(1, DLL(iobase));
outb(0, DLM(iobase));
outb(LCR_BIT5, LCR(iobase));
inb(LSR(iobase));
inb(MSR(iobase));
/* turn off FPGA supply voltage */
outb(MCR_OUT1 | MCR_OUT2, MCR(iobase));
delay(100);
/* turn on FPGA supply voltage again */
outb(MCR_DTR | MCR_RTS | MCR_OUT1 | MCR_OUT2, MCR(iobase));
delay(100);
}
/*
* send one byte to FPGA
*/
static int fpga_write(int iobase, unsigned char wrd)
{
unsigned char bit;
int k;
unsigned long timeout = jiffies + HZ / 10;
for (k = 0; k < 8; k++) {
bit = (wrd & 0x80) ? (MCR_RTS | MCR_DTR) : MCR_DTR;
outb(bit | MCR_OUT1 | MCR_OUT2, MCR(iobase));
wrd <<= 1;
outb(0xfc, THR(iobase));
while ((inb(LSR(iobase)) & LSR_TSRE) == 0)
if (time_after(jiffies, timeout))
return -1;
}
return 0;
}
static unsigned char *add_mcs(unsigned char *bits, int bitrate)
{
struct yam_mcs *p;
/* If it already exists, replace the bit data */
p = yam_data;
while (p) {
if (p->bitrate == bitrate) {
memcpy(p->bits, bits, YAM_FPGA_SIZE);
return p->bits;
}
p = p->next;
}
/* Allocate a new mcs */
if ((p = kmalloc(sizeof(struct yam_mcs), GFP_KERNEL)) == NULL) {
printk(KERN_WARNING "YAM: no memory to allocate mcs\n");
return NULL;
}
memcpy(p->bits, bits, YAM_FPGA_SIZE);
p->bitrate = bitrate;
p->next = yam_data;
yam_data = p;
return p->bits;
}
static unsigned char *get_mcs(int bitrate)
{
struct yam_mcs *p;
p = yam_data;
while (p) {
if (p->bitrate == bitrate)
return p->bits;
p = p->next;
}
/* Load predefined mcs data */
switch (bitrate) {
case 1200:
return add_mcs(bits_1200, bitrate);
default:
return add_mcs(bits_9600, bitrate);
}
}
/*
* download bitstream to FPGA
* data is contained in bits[] array in yam1200.h resp. yam9600.h
*/
static int fpga_download(int iobase, int bitrate)
{
int i, rc;
unsigned char *pbits;
pbits = get_mcs(bitrate);
if (pbits == NULL)
return -1;
fpga_reset(iobase);
for (i = 0; i < YAM_FPGA_SIZE; i++) {
if (fpga_write(iobase, pbits[i])) {
printk(KERN_ERR "yam: error in write cycle\n");
return -1; /* write... */
}
}
fpga_write(iobase, 0xFF);
rc = inb(MSR(iobase)); /* check DONE signal */
/* Needed for some hardwares */
delay(50);
return (rc & MSR_DSR) ? 0 : -1;
}
/************************************************************************
* Serial port init
************************************************************************/
static void yam_set_uart(struct net_device *dev)
{
struct yam_port *yp = netdev_priv(dev);
int divisor = 115200 / yp->baudrate;
outb(0, IER(dev->base_addr));
outb(LCR_DLAB | LCR_BIT8, LCR(dev->base_addr));
outb(divisor, DLL(dev->base_addr));
outb(0, DLM(dev->base_addr));
outb(LCR_BIT8, LCR(dev->base_addr));
outb(PTT_OFF, MCR(dev->base_addr));
outb(0x00, FCR(dev->base_addr));
/* Flush pending irq */
inb(RBR(dev->base_addr));
inb(MSR(dev->base_addr));
/* Enable rx irq */
outb(ENABLE_RTXINT, IER(dev->base_addr));
}
/* --------------------------------------------------------------------- */
enum uart {
c_uart_unknown, c_uart_8250,
c_uart_16450, c_uart_16550, c_uart_16550A
};
static const char *uart_str[] =
{"unknown", "8250", "16450", "16550", "16550A"};
static enum uart yam_check_uart(unsigned int iobase)
{
unsigned char b1, b2, b3;
enum uart u;
enum uart uart_tab[] =
{c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A};
b1 = inb(MCR(iobase));
outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
b2 = inb(MSR(iobase));
outb(0x1a, MCR(iobase));
b3 = inb(MSR(iobase)) & 0xf0;
outb(b1, MCR(iobase)); /* restore old values */
outb(b2, MSR(iobase));
if (b3 != 0x90)
return c_uart_unknown;
inb(RBR(iobase));
inb(RBR(iobase));
outb(0x01, FCR(iobase)); /* enable FIFOs */
u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
if (u == c_uart_16450) {
outb(0x5a, SCR(iobase));
b1 = inb(SCR(iobase));
outb(0xa5, SCR(iobase));
b2 = inb(SCR(iobase));
if ((b1 != 0x5a) || (b2 != 0xa5))
u = c_uart_8250;
}
return u;
}
/******************************************************************************
* Rx Section
******************************************************************************/
static inline void yam_rx_flag(struct net_device *dev, struct yam_port *yp)
{
if (yp->dcd && yp->rx_len >= 3 && yp->rx_len < YAM_MAX_FRAME) {
int pkt_len = yp->rx_len - 2 + 1; /* -CRC + kiss */
struct sk_buff *skb;
if ((yp->rx_crch & yp->rx_crcl) != 0xFF) {
/* Bad crc */
} else {
if (!(skb = dev_alloc_skb(pkt_len))) {
printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
++yp->stats.rx_dropped;
} else {
unsigned char *cp;
cp = skb_put(skb, pkt_len);
*cp++ = 0; /* KISS kludge */
memcpy(cp, yp->rx_buf, pkt_len - 1);
skb->protocol = ax25_type_trans(skb, dev);
netif_rx(skb);
dev->last_rx = jiffies;
++yp->stats.rx_packets;
}
}
}
yp->rx_len = 0;
yp->rx_crcl = 0x21;
yp->rx_crch = 0xf3;
}
static inline void yam_rx_byte(struct net_device *dev, struct yam_port *yp, unsigned char rxb)
{
if (yp->rx_len < YAM_MAX_FRAME) {
unsigned char c = yp->rx_crcl;
yp->rx_crcl = (chktabl[c] ^ yp->rx_crch);
yp->rx_crch = (chktabh[c] ^ rxb);
yp->rx_buf[yp->rx_len++] = rxb;
}
}
/********************************************************************************
* TX Section
********************************************************************************/
static void ptt_on(struct net_device *dev)
{
outb(PTT_ON, MCR(dev->base_addr));
}
static void ptt_off(struct net_device *dev)
{
outb(PTT_OFF, MCR(dev->base_addr));
}
static int yam_send_packet(struct sk_buff *skb, struct net_device *dev)
{
struct yam_port *yp = netdev_priv(dev);
skb_queue_tail(&yp->send_queue, skb);
dev->trans_start = jiffies;
return 0;
}
static void yam_start_tx(struct net_device *dev, struct yam_port *yp)
{
if ((yp->tx_state == TX_TAIL) || (yp->txd == 0))
yp->tx_count = 1;
else
yp->tx_count = (yp->bitrate * yp->txd) / 8000;
yp->tx_state = TX_HEAD;
ptt_on(dev);
}
static unsigned short random_seed;
static inline unsigned short random_num(void)
{
random_seed = 28629 * random_seed + 157;
return random_seed;
}
static void yam_arbitrate(struct net_device *dev)
{
struct yam_port *yp = netdev_priv(dev);
if (yp->magic != YAM_MAGIC || yp->tx_state != TX_OFF ||
skb_queue_empty(&yp->send_queue))
return;
/* tx_state is TX_OFF and there is data to send */
if (yp->dupmode) {
/* Full duplex mode, don't wait */
yam_start_tx(dev, yp);
return;
}
if (yp->dcd) {
/* DCD on, wait slotime ... */
yp->slotcnt = yp->slot / 10;
return;
}
/* Is slottime passed ? */
if ((--yp->slotcnt) > 0)
return;
yp->slotcnt = yp->slot / 10;
/* is random > persist ? */
if ((random_num() % 256) > yp->pers)
return;
yam_start_tx(dev, yp);
}
static void yam_dotimer(unsigned long dummy)
{
int i;
for (i = 0; i < NR_PORTS; i++) {
struct net_device *dev = yam_devs[i];
if (dev && netif_running(dev))
yam_arbitrate(dev);
}
yam_timer.expires = jiffies + HZ / 100;
add_timer(&yam_timer);
}
static void yam_tx_byte(struct net_device *dev, struct yam_port *yp)
{
struct sk_buff *skb;
unsigned char b, temp;
switch (yp->tx_state) {
case TX_OFF:
break;
case TX_HEAD:
if (--yp->tx_count <= 0) {
if (!(skb = skb_dequeue(&yp->send_queue))) {
ptt_off(dev);
yp->tx_state = TX_OFF;
break;
}
yp->tx_state = TX_DATA;
if (skb->data[0] != 0) {
/* do_kiss_params(s, skb->data, skb->len); */
dev_kfree_skb_any(skb);
break;
}
yp->tx_len = skb->len - 1; /* strip KISS byte */
if (yp->tx_len >= YAM_MAX_FRAME || yp->tx_len < 2) {
dev_kfree_skb_any(skb);
break;
}
memcpy(yp->tx_buf, skb->data + 1, yp->tx_len);
dev_kfree_skb_any(skb);
yp->tx_count = 0;
yp->tx_crcl = 0x21;
yp->tx_crch = 0xf3;
yp->tx_state = TX_DATA;
}
break;
case TX_DATA:
b = yp->tx_buf[yp->tx_count++];
outb(b, THR(dev->base_addr));
temp = yp->tx_crcl;
yp->tx_crcl = chktabl[temp] ^ yp->tx_crch;
yp->tx_crch = chktabh[temp] ^ b;
if (yp->tx_count >= yp->tx_len) {
yp->tx_state = TX_CRC1;
}
break;
case TX_CRC1:
yp->tx_crch = chktabl[yp->tx_crcl] ^ yp->tx_crch;
yp->tx_crcl = chktabh[yp->tx_crcl] ^ chktabl[yp->tx_crch] ^ 0xff;
outb(yp->tx_crcl, THR(dev->base_addr));
yp->tx_state = TX_CRC2;
break;
case TX_CRC2:
outb(chktabh[yp->tx_crch] ^ 0xFF, THR(dev->base_addr));
if (skb_queue_empty(&yp->send_queue)) {
yp->tx_count = (yp->bitrate * yp->txtail) / 8000;
if (yp->dupmode == 2)
yp->tx_count += (yp->bitrate * yp->holdd) / 8;
if (yp->tx_count == 0)
yp->tx_count = 1;
yp->tx_state = TX_TAIL;
} else {
yp->tx_count = 1;
yp->tx_state = TX_HEAD;
}
++yp->stats.tx_packets;
break;
case TX_TAIL:
if (--yp->tx_count <= 0) {
yp->tx_state = TX_OFF;
ptt_off(dev);
}
break;
}
}
/***********************************************************************************
* ISR routine
************************************************************************************/
static irqreturn_t yam_interrupt(int irq, void *dev_id)
{
struct net_device *dev;
struct yam_port *yp;
unsigned char iir;
int counter = 100;
int i;
int handled = 0;
for (i = 0; i < NR_PORTS; i++) {
dev = yam_devs[i];
yp = netdev_priv(dev);
if (!netif_running(dev))
continue;
while ((iir = IIR_MASK & inb(IIR(dev->base_addr))) != IIR_NOPEND) {
unsigned char msr = inb(MSR(dev->base_addr));
unsigned char lsr = inb(LSR(dev->base_addr));
unsigned char rxb;
handled = 1;
if (lsr & LSR_OE)
++yp->stats.rx_fifo_errors;
yp->dcd = (msr & RX_DCD) ? 1 : 0;
if (--counter <= 0) {
printk(KERN_ERR "%s: too many irq iir=%d\n",
dev->name, iir);
goto out;
}
if (msr & TX_RDY) {
++yp->nb_mdint;
yam_tx_byte(dev, yp);
}
if (lsr & LSR_RXC) {
++yp->nb_rxint;
rxb = inb(RBR(dev->base_addr));
if (msr & RX_FLAG)
yam_rx_flag(dev, yp);
else
yam_rx_byte(dev, yp, rxb);
}
}
}
out:
return IRQ_RETVAL(handled);
}
#ifdef CONFIG_PROC_FS
static void *yam_seq_start(struct seq_file *seq, loff_t *pos)
{
return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
}
static void *yam_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
++*pos;
return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
}
static void yam_seq_stop(struct seq_file *seq, void *v)
{
}
static int yam_seq_show(struct seq_file *seq, void *v)
{
struct net_device *dev = v;
const struct yam_port *yp = netdev_priv(dev);
seq_printf(seq, "Device %s\n", dev->name);
seq_printf(seq, " Up %d\n", netif_running(dev));
seq_printf(seq, " Speed %u\n", yp->bitrate);
seq_printf(seq, " IoBase 0x%x\n", yp->iobase);
seq_printf(seq, " BaudRate %u\n", yp->baudrate);
seq_printf(seq, " IRQ %u\n", yp->irq);
seq_printf(seq, " TxState %u\n", yp->tx_state);
seq_printf(seq, " Duplex %u\n", yp->dupmode);
seq_printf(seq, " HoldDly %u\n", yp->holdd);
seq_printf(seq, " TxDelay %u\n", yp->txd);
seq_printf(seq, " TxTail %u\n", yp->txtail);
seq_printf(seq, " SlotTime %u\n", yp->slot);
seq_printf(seq, " Persist %u\n", yp->pers);
seq_printf(seq, " TxFrames %lu\n", yp->stats.tx_packets);
seq_printf(seq, " RxFrames %lu\n", yp->stats.rx_packets);
seq_printf(seq, " TxInt %u\n", yp->nb_mdint);
seq_printf(seq, " RxInt %u\n", yp->nb_rxint);
seq_printf(seq, " RxOver %lu\n", yp->stats.rx_fifo_errors);
seq_printf(seq, "\n");
return 0;
}
static struct seq_operations yam_seqops = {
.start = yam_seq_start,
.next = yam_seq_next,
.stop = yam_seq_stop,
.show = yam_seq_show,
};
static int yam_info_open(struct inode *inode, struct file *file)
{
return seq_open(file, &yam_seqops);
}
static struct file_operations yam_info_fops = {
.owner = THIS_MODULE,
.open = yam_info_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#endif
/* --------------------------------------------------------------------- */
static struct net_device_stats *yam_get_stats(struct net_device *dev)
{
struct yam_port *yp;
if (!dev)
return NULL;
yp = netdev_priv(dev);
if (yp->magic != YAM_MAGIC)
return NULL;
/*
* Get the current statistics. This may be called with the
* card open or closed.
*/
return &yp->stats;
}
/* --------------------------------------------------------------------- */
static int yam_open(struct net_device *dev)
{
struct yam_port *yp = netdev_priv(dev);
enum uart u;
int i;
int ret=0;
printk(KERN_INFO "Trying %s at iobase 0x%lx irq %u\n", dev->name, dev->base_addr, dev->irq);
if (!dev || !yp->bitrate)
return -ENXIO;
if (!dev->base_addr || dev->base_addr > 0x1000 - YAM_EXTENT ||
dev->irq < 2 || dev->irq > 15) {
return -ENXIO;
}
if (!request_region(dev->base_addr, YAM_EXTENT, dev->name))
{
printk(KERN_ERR "%s: cannot 0x%lx busy\n", dev->name, dev->base_addr);
return -EACCES;
}
if ((u = yam_check_uart(dev->base_addr)) == c_uart_unknown) {
printk(KERN_ERR "%s: cannot find uart type\n", dev->name);
ret = -EIO;
goto out_release_base;
}
if (fpga_download(dev->base_addr, yp->bitrate)) {
printk(KERN_ERR "%s: cannot init FPGA\n", dev->name);
ret = -EIO;
goto out_release_base;
}
outb(0, IER(dev->base_addr));
if (request_irq(dev->irq, yam_interrupt, IRQF_DISABLED | IRQF_SHARED, dev->name, dev)) {
printk(KERN_ERR "%s: irq %d busy\n", dev->name, dev->irq);
ret = -EBUSY;
goto out_release_base;
}
yam_set_uart(dev);
netif_start_queue(dev);
yp->slotcnt = yp->slot / 10;
/* Reset overruns for all ports - FPGA programming makes overruns */
for (i = 0; i < NR_PORTS; i++) {
struct net_device *dev = yam_devs[i];
struct yam_port *yp = netdev_priv(dev);
inb(LSR(dev->base_addr));
yp->stats.rx_fifo_errors = 0;
}
printk(KERN_INFO "%s at iobase 0x%lx irq %u uart %s\n", dev->name, dev->base_addr, dev->irq,
uart_str[u]);
return 0;
out_release_base:
release_region(dev->base_addr, YAM_EXTENT);
return ret;
}
/* --------------------------------------------------------------------- */
static int yam_close(struct net_device *dev)
{
struct sk_buff *skb;
struct yam_port *yp = netdev_priv(dev);
if (!dev)
return -EINVAL;
/*
* disable interrupts
*/
outb(0, IER(dev->base_addr));
outb(1, MCR(dev->base_addr));
/* Remove IRQ handler if last */
free_irq(dev->irq,dev);
release_region(dev->base_addr, YAM_EXTENT);
netif_stop_queue(dev);
while ((skb = skb_dequeue(&yp->send_queue)))
dev_kfree_skb(skb);
printk(KERN_INFO "%s: close yam at iobase 0x%lx irq %u\n",
yam_drvname, dev->base_addr, dev->irq);
return 0;
}
/* --------------------------------------------------------------------- */
static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct yam_port *yp = netdev_priv(dev);
struct yamdrv_ioctl_cfg yi;
struct yamdrv_ioctl_mcs *ym;
int ioctl_cmd;
if (copy_from_user(&ioctl_cmd, ifr->ifr_data, sizeof(int)))
return -EFAULT;
if (yp->magic != YAM_MAGIC)
return -EINVAL;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (cmd != SIOCDEVPRIVATE)
return -EINVAL;
switch (ioctl_cmd) {
case SIOCYAMRESERVED:
return -EINVAL; /* unused */
case SIOCYAMSMCS:
if (netif_running(dev))
return -EINVAL; /* Cannot change this parameter when up */
if ((ym = kmalloc(sizeof(struct yamdrv_ioctl_mcs), GFP_KERNEL)) == NULL)
return -ENOBUFS;
ym->bitrate = 9600;
if (copy_from_user(ym, ifr->ifr_data, sizeof(struct yamdrv_ioctl_mcs))) {
kfree(ym);
return -EFAULT;
}
if (ym->bitrate > YAM_MAXBITRATE) {
kfree(ym);
return -EINVAL;
}
add_mcs(ym->bits, ym->bitrate);
kfree(ym);
break;
case SIOCYAMSCFG:
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
if (copy_from_user(&yi, ifr->ifr_data, sizeof(struct yamdrv_ioctl_cfg)))
return -EFAULT;
if ((yi.cfg.mask & YAM_IOBASE) && netif_running(dev))
return -EINVAL; /* Cannot change this parameter when up */
if ((yi.cfg.mask & YAM_IRQ) && netif_running(dev))
return -EINVAL; /* Cannot change this parameter when up */
if ((yi.cfg.mask & YAM_BITRATE) && netif_running(dev))
return -EINVAL; /* Cannot change this parameter when up */
if ((yi.cfg.mask & YAM_BAUDRATE) && netif_running(dev))
return -EINVAL; /* Cannot change this parameter when up */
if (yi.cfg.mask & YAM_IOBASE) {
yp->iobase = yi.cfg.iobase;
dev->base_addr = yi.cfg.iobase;
}
if (yi.cfg.mask & YAM_IRQ) {
if (yi.cfg.irq > 15)
return -EINVAL;
yp->irq = yi.cfg.irq;
dev->irq = yi.cfg.irq;
}
if (yi.cfg.mask & YAM_BITRATE) {
if (yi.cfg.bitrate > YAM_MAXBITRATE)
return -EINVAL;
yp->bitrate = yi.cfg.bitrate;
}
if (yi.cfg.mask & YAM_BAUDRATE) {
if (yi.cfg.baudrate > YAM_MAXBAUDRATE)
return -EINVAL;
yp->baudrate = yi.cfg.baudrate;
}
if (yi.cfg.mask & YAM_MODE) {
if (yi.cfg.mode > YAM_MAXMODE)
return -EINVAL;
yp->dupmode = yi.cfg.mode;
}
if (yi.cfg.mask & YAM_HOLDDLY) {
if (yi.cfg.holddly > YAM_MAXHOLDDLY)
return -EINVAL;
yp->holdd = yi.cfg.holddly;
}
if (yi.cfg.mask & YAM_TXDELAY) {
if (yi.cfg.txdelay > YAM_MAXTXDELAY)
return -EINVAL;
yp->txd = yi.cfg.txdelay;
}
if (yi.cfg.mask & YAM_TXTAIL) {
if (yi.cfg.txtail > YAM_MAXTXTAIL)
return -EINVAL;
yp->txtail = yi.cfg.txtail;
}
if (yi.cfg.mask & YAM_PERSIST) {
if (yi.cfg.persist > YAM_MAXPERSIST)
return -EINVAL;
yp->pers = yi.cfg.persist;
}
if (yi.cfg.mask & YAM_SLOTTIME) {
if (yi.cfg.slottime > YAM_MAXSLOTTIME)
return -EINVAL;
yp->slot = yi.cfg.slottime;
yp->slotcnt = yp->slot / 10;
}
break;
case SIOCYAMGCFG:
yi.cfg.mask = 0xffffffff;
yi.cfg.iobase = yp->iobase;
yi.cfg.irq = yp->irq;
yi.cfg.bitrate = yp->bitrate;
yi.cfg.baudrate = yp->baudrate;
yi.cfg.mode = yp->dupmode;
yi.cfg.txdelay = yp->txd;
yi.cfg.holddly = yp->holdd;
yi.cfg.txtail = yp->txtail;
yi.cfg.persist = yp->pers;
yi.cfg.slottime = yp->slot;
if (copy_to_user(ifr->ifr_data, &yi, sizeof(struct yamdrv_ioctl_cfg)))
return -EFAULT;
break;
default:
return -EINVAL;
}
return 0;
}
/* --------------------------------------------------------------------- */
static int yam_set_mac_address(struct net_device *dev, void *addr)
{
struct sockaddr *sa = (struct sockaddr *) addr;
/* addr is an AX.25 shifted ASCII mac address */
memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
return 0;
}
/* --------------------------------------------------------------------- */
static void yam_setup(struct net_device *dev)
{
struct yam_port *yp = netdev_priv(dev);
yp->magic = YAM_MAGIC;
yp->bitrate = DEFAULT_BITRATE;
yp->baudrate = DEFAULT_BITRATE * 2;
yp->iobase = 0;
yp->irq = 0;
yp->dupmode = 0;
yp->holdd = DEFAULT_HOLDD;
yp->txd = DEFAULT_TXD;
yp->txtail = DEFAULT_TXTAIL;
yp->slot = DEFAULT_SLOT;
yp->pers = DEFAULT_PERS;
yp->dev = dev;
dev->base_addr = yp->iobase;
dev->irq = yp->irq;
dev->open = yam_open;
dev->stop = yam_close;
dev->do_ioctl = yam_ioctl;
dev->hard_start_xmit = yam_send_packet;
dev->get_stats = yam_get_stats;
skb_queue_head_init(&yp->send_queue);
dev->hard_header = ax25_hard_header;
dev->rebuild_header = ax25_rebuild_header;
dev->set_mac_address = yam_set_mac_address;
dev->type = ARPHRD_AX25;
dev->hard_header_len = AX25_MAX_HEADER_LEN;
dev->mtu = AX25_MTU;
dev->addr_len = AX25_ADDR_LEN;
memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN);
}
static int __init yam_init_driver(void)
{
struct net_device *dev;
int i, err;
char name[IFNAMSIZ];
printk(yam_drvinfo);
for (i = 0; i < NR_PORTS; i++) {
sprintf(name, "yam%d", i);
dev = alloc_netdev(sizeof(struct yam_port), name,
yam_setup);
if (!dev) {
printk(KERN_ERR "yam: cannot allocate net device %s\n",
dev->name);
err = -ENOMEM;
goto error;
}
err = register_netdev(dev);
if (err) {
printk(KERN_WARNING "yam: cannot register net device %s\n", dev->name);
goto error;
}
yam_devs[i] = dev;
}
yam_timer.function = yam_dotimer;
yam_timer.expires = jiffies + HZ / 100;
add_timer(&yam_timer);
proc_net_fops_create("yam", S_IRUGO, &yam_info_fops);
return 0;
error:
while (--i >= 0) {
unregister_netdev(yam_devs[i]);
free_netdev(yam_devs[i]);
}
return err;
}
/* --------------------------------------------------------------------- */
static void __exit yam_cleanup_driver(void)
{
struct yam_mcs *p;
int i;
del_timer(&yam_timer);
for (i = 0; i < NR_PORTS; i++) {
struct net_device *dev = yam_devs[i];
if (dev) {
unregister_netdev(dev);
free_netdev(dev);
}
}
while (yam_data) {
p = yam_data;
yam_data = yam_data->next;
kfree(p);
}
proc_net_remove("yam");
}
/* --------------------------------------------------------------------- */
MODULE_AUTHOR("Frederic Rible F1OAT frible@teaser.fr");
MODULE_DESCRIPTION("Yam amateur radio modem driver");
MODULE_LICENSE("GPL");
module_init(yam_init_driver);
module_exit(yam_cleanup_driver);
/* --------------------------------------------------------------------- */
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