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linux/drivers/net/wan/cycx_drv.c
Adrian Bunk 7665a08928 [PATCH] drivers/net/wan/: possible cleanups 
This patch contains possible cleanups including the following:
- make needlessly global code static
- #if 0 the following unused global function:
  - sdladrv.c: sdla_intde
- remove the following unused global variable:
  - lmc_media.c: lmc_t1_cables
- remove the following unneeded EXPORT_SYMBOL's:
  - cycx_drv.c: cycx_inten
  - sdladrv.c: sdla_inten
  - sdladrv.c: sdla_intde
  - sdladrv.c: sdla_intack
  - sdladrv.c: sdla_intr
  - syncppp.c: sppp_input
  - syncppp.c: sppp_change_mtu

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-09-14 08:36:54 -04:00

578 lines
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/*
* cycx_drv.c Cyclom 2X Support Module.
*
* This module is a library of common hardware specific
* functions used by the Cyclades Cyclom 2X sync card.
*
* Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*
* Copyright: (c) 1998-2003 Arnaldo Carvalho de Melo
*
* Based on sdladrv.c by Gene Kozin <genek@compuserve.com>
*
* 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.
* ============================================================================
* 1999/11/11 acme set_current_state(TASK_INTERRUPTIBLE), code
* cleanup
* 1999/11/08 acme init_cyc2x deleted, doing nothing
* 1999/11/06 acme back to read[bw], write[bw] and memcpy_to and
* fromio to use dpmbase ioremaped
* 1999/10/26 acme use isa_read[bw], isa_write[bw] & isa_memcpy_to
* & fromio
* 1999/10/23 acme cleanup to only supports cyclom2x: all the other
* boards are no longer manufactured by cyclades,
* if someone wants to support them... be my guest!
* 1999/05/28 acme cycx_intack & cycx_intde gone for good
* 1999/05/18 acme lots of unlogged work, submitting to Linus...
* 1999/01/03 acme more judicious use of data types
* 1999/01/03 acme judicious use of data types :>
* cycx_inten trying to reset pending interrupts
* from cyclom 2x - I think this isn't the way to
* go, but for now...
* 1999/01/02 acme cycx_intack ok, I think there's nothing to do
* to ack an int in cycx_drv.c, only handle it in
* cyx_isr (or in the other protocols: cyp_isr,
* cyf_isr, when they get implemented.
* Dec 31, 1998 acme cycx_data_boot & cycx_code_boot fixed, crossing
* fingers to see x25_configure in cycx_x25.c
* work... :)
* Dec 26, 1998 acme load implementation fixed, seems to work! :)
* cycx_2x_dpmbase_options with all the possible
* DPM addresses (20).
* cycx_intr implemented (test this!)
* general code cleanup
* Dec 8, 1998 Ivan Passos Cyclom-2X firmware load implementation.
* Aug 8, 1998 acme Initial version.
*/
#include <linux/init.h> /* __init */
#include <linux/module.h>
#include <linux/kernel.h> /* printk(), and other useful stuff */
#include <linux/stddef.h> /* offsetof(), etc. */
#include <linux/errno.h> /* return codes */
#include <linux/sched.h> /* for jiffies, HZ, etc. */
#include <linux/cycx_drv.h> /* API definitions */
#include <linux/cycx_cfm.h> /* CYCX firmware module definitions */
#include <linux/delay.h> /* udelay, msleep_interruptible */
#include <asm/io.h> /* read[wl], write[wl], ioremap, iounmap */
#define MOD_VERSION 0
#define MOD_RELEASE 6
MODULE_AUTHOR("Arnaldo Carvalho de Melo");
MODULE_DESCRIPTION("Cyclom 2x Sync Card Driver");
MODULE_LICENSE("GPL");
/* Hardware-specific functions */
static int load_cyc2x(struct cycx_hw *hw, struct cycx_firmware *cfm, u32 len);
static void cycx_bootcfg(struct cycx_hw *hw);
static int reset_cyc2x(void __iomem *addr);
static int detect_cyc2x(void __iomem *addr);
/* Miscellaneous functions */
static int get_option_index(long *optlist, long optval);
static u16 checksum(u8 *buf, u32 len);
#define wait_cyc(addr) cycx_exec(addr + CMD_OFFSET)
/* Global Data */
/* private data */
static char modname[] = "cycx_drv";
static char fullname[] = "Cyclom 2X Support Module";
static char copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
"<acme@conectiva.com.br>";
/* Hardware configuration options.
* These are arrays of configuration options used by verification routines.
* The first element of each array is its size (i.e. number of options).
*/
static long cyc2x_dpmbase_options[] = {
20,
0xA0000, 0xA4000, 0xA8000, 0xAC000, 0xB0000, 0xB4000, 0xB8000,
0xBC000, 0xC0000, 0xC4000, 0xC8000, 0xCC000, 0xD0000, 0xD4000,
0xD8000, 0xDC000, 0xE0000, 0xE4000, 0xE8000, 0xEC000
};
static long cycx_2x_irq_options[] = { 7, 3, 5, 9, 10, 11, 12, 15 };
/* Kernel Loadable Module Entry Points */
/* Module 'insert' entry point.
* o print announcement
* o initialize static data
*
* Return: 0 Ok
* < 0 error.
* Context: process */
static int __init cycx_drv_init(void)
{
printk(KERN_INFO "%s v%u.%u %s\n", fullname, MOD_VERSION, MOD_RELEASE,
copyright);
return 0;
}
/* Module 'remove' entry point.
* o release all remaining system resources */
static void cycx_drv_cleanup(void)
{
}
/* Kernel APIs */
/* Set up adapter.
* o detect adapter type
* o verify hardware configuration options
* o check for hardware conflicts
* o set up adapter shared memory
* o test adapter memory
* o load firmware
* Return: 0 ok.
* < 0 error */
EXPORT_SYMBOL(cycx_setup);
int cycx_setup(struct cycx_hw *hw, void *cfm, u32 len, unsigned long dpmbase)
{
int err;
/* Verify IRQ configuration options */
if (!get_option_index(cycx_2x_irq_options, hw->irq)) {
printk(KERN_ERR "%s: IRQ %d is invalid!\n", modname, hw->irq);
return -EINVAL;
}
/* Setup adapter dual-port memory window and test memory */
if (!dpmbase) {
printk(KERN_ERR "%s: you must specify the dpm address!\n",
modname);
return -EINVAL;
} else if (!get_option_index(cyc2x_dpmbase_options, dpmbase)) {
printk(KERN_ERR "%s: memory address 0x%lX is invalid!\n",
modname, dpmbase);
return -EINVAL;
}
hw->dpmbase = ioremap(dpmbase, CYCX_WINDOWSIZE);
hw->dpmsize = CYCX_WINDOWSIZE;
if (!detect_cyc2x(hw->dpmbase)) {
printk(KERN_ERR "%s: adapter Cyclom 2X not found at "
"address 0x%lX!\n", modname, dpmbase);
return -EINVAL;
}
printk(KERN_INFO "%s: found Cyclom 2X card at address 0x%lX.\n",
modname, dpmbase);
/* Load firmware. If loader fails then shut down adapter */
err = load_cyc2x(hw, cfm, len);
if (err)
cycx_down(hw); /* shutdown adapter */
return err;
}
EXPORT_SYMBOL(cycx_down);
int cycx_down(struct cycx_hw *hw)
{
iounmap(hw->dpmbase);
return 0;
}
/* Enable interrupt generation. */
static void cycx_inten(struct cycx_hw *hw)
{
writeb(0, hw->dpmbase);
}
/* Generate an interrupt to adapter's CPU. */
EXPORT_SYMBOL(cycx_intr);
void cycx_intr(struct cycx_hw *hw)
{
writew(0, hw->dpmbase + GEN_CYCX_INTR);
}
/* Execute Adapter Command.
* o Set exec flag.
* o Busy-wait until flag is reset. */
EXPORT_SYMBOL(cycx_exec);
int cycx_exec(void __iomem *addr)
{
u16 i = 0;
/* wait till addr content is zeroed */
while (readw(addr)) {
udelay(1000);
if (++i > 50)
return -1;
}
return 0;
}
/* Read absolute adapter memory.
* Transfer data from adapter's memory to data buffer. */
EXPORT_SYMBOL(cycx_peek);
int cycx_peek(struct cycx_hw *hw, u32 addr, void *buf, u32 len)
{
if (len == 1)
*(u8*)buf = readb(hw->dpmbase + addr);
else
memcpy_fromio(buf, hw->dpmbase + addr, len);
return 0;
}
/* Write Absolute Adapter Memory.
* Transfer data from data buffer to adapter's memory. */
EXPORT_SYMBOL(cycx_poke);
int cycx_poke(struct cycx_hw *hw, u32 addr, void *buf, u32 len)
{
if (len == 1)
writeb(*(u8*)buf, hw->dpmbase + addr);
else
memcpy_toio(hw->dpmbase + addr, buf, len);
return 0;
}
/* Hardware-Specific Functions */
/* Load Aux Routines */
/* Reset board hardware.
return 1 if memory exists at addr and 0 if not. */
static int memory_exists(void __iomem *addr)
{
int tries = 0;
for (; tries < 3 ; tries++) {
writew(TEST_PATTERN, addr + 0x10);
if (readw(addr + 0x10) == TEST_PATTERN)
if (readw(addr + 0x10) == TEST_PATTERN)
return 1;
msleep_interruptible(1 * 1000);
}
return 0;
}
/* Load reset code. */
static void reset_load(void __iomem *addr, u8 *buffer, u32 cnt)
{
void __iomem *pt_code = addr + RESET_OFFSET;
u16 i; /*, j; */
for (i = 0 ; i < cnt ; i++) {
/* for (j = 0 ; j < 50 ; j++); Delay - FIXME busy waiting... */
writeb(*buffer++, pt_code++);
}
}
/* Load buffer using boot interface.
* o copy data from buffer to Cyclom-X memory
* o wait for reset code to copy it to right portion of memory */
static int buffer_load(void __iomem *addr, u8 *buffer, u32 cnt)
{
memcpy_toio(addr + DATA_OFFSET, buffer, cnt);
writew(GEN_BOOT_DAT, addr + CMD_OFFSET);
return wait_cyc(addr);
}
/* Set up entry point and kick start Cyclom-X CPU. */
static void cycx_start(void __iomem *addr)
{
/* put in 0x30 offset the jump instruction to the code entry point */
writeb(0xea, addr + 0x30);
writeb(0x00, addr + 0x31);
writeb(0xc4, addr + 0x32);
writeb(0x00, addr + 0x33);
writeb(0x00, addr + 0x34);
/* cmd to start executing code */
writew(GEN_START, addr + CMD_OFFSET);
}
/* Load and boot reset code. */
static void cycx_reset_boot(void __iomem *addr, u8 *code, u32 len)
{
void __iomem *pt_start = addr + START_OFFSET;
writeb(0xea, pt_start++); /* jmp to f000:3f00 */
writeb(0x00, pt_start++);
writeb(0xfc, pt_start++);
writeb(0x00, pt_start++);
writeb(0xf0, pt_start);
reset_load(addr, code, len);
/* 80186 was in hold, go */
writeb(0, addr + START_CPU);
msleep_interruptible(1 * 1000);
}
/* Load data.bin file through boot (reset) interface. */
static int cycx_data_boot(void __iomem *addr, u8 *code, u32 len)
{
void __iomem *pt_boot_cmd = addr + CMD_OFFSET;
u32 i;
/* boot buffer lenght */
writew(CFM_LOAD_BUFSZ, pt_boot_cmd + sizeof(u16));
writew(GEN_DEFPAR, pt_boot_cmd);
if (wait_cyc(addr) < 0)
return -1;
writew(0, pt_boot_cmd + sizeof(u16));
writew(0x4000, pt_boot_cmd + 2 * sizeof(u16));
writew(GEN_SET_SEG, pt_boot_cmd);
if (wait_cyc(addr) < 0)
return -1;
for (i = 0 ; i < len ; i += CFM_LOAD_BUFSZ)
if (buffer_load(addr, code + i,
min_t(u32, CFM_LOAD_BUFSZ, (len - i))) < 0) {
printk(KERN_ERR "%s: Error !!\n", modname);
return -1;
}
return 0;
}
/* Load code.bin file through boot (reset) interface. */
static int cycx_code_boot(void __iomem *addr, u8 *code, u32 len)
{
void __iomem *pt_boot_cmd = addr + CMD_OFFSET;
u32 i;
/* boot buffer lenght */
writew(CFM_LOAD_BUFSZ, pt_boot_cmd + sizeof(u16));
writew(GEN_DEFPAR, pt_boot_cmd);
if (wait_cyc(addr) < 0)
return -1;
writew(0x0000, pt_boot_cmd + sizeof(u16));
writew(0xc400, pt_boot_cmd + 2 * sizeof(u16));
writew(GEN_SET_SEG, pt_boot_cmd);
if (wait_cyc(addr) < 0)
return -1;
for (i = 0 ; i < len ; i += CFM_LOAD_BUFSZ)
if (buffer_load(addr, code + i,
min_t(u32, CFM_LOAD_BUFSZ, (len - i)))) {
printk(KERN_ERR "%s: Error !!\n", modname);
return -1;
}
return 0;
}
/* Load adapter from the memory image of the CYCX firmware module.
* o verify firmware integrity and compatibility
* o start adapter up */
static int load_cyc2x(struct cycx_hw *hw, struct cycx_firmware *cfm, u32 len)
{
int i, j;
struct cycx_fw_header *img_hdr;
u8 *reset_image,
*data_image,
*code_image;
void __iomem *pt_cycld = hw->dpmbase + 0x400;
u16 cksum;
/* Announce */
printk(KERN_INFO "%s: firmware signature=\"%s\"\n", modname,
cfm->signature);
/* Verify firmware signature */
if (strcmp(cfm->signature, CFM_SIGNATURE)) {
printk(KERN_ERR "%s:load_cyc2x: not Cyclom-2X firmware!\n",
modname);
return -EINVAL;
}
printk(KERN_INFO "%s: firmware version=%u\n", modname, cfm->version);
/* Verify firmware module format version */
if (cfm->version != CFM_VERSION) {
printk(KERN_ERR "%s:%s: firmware format %u rejected! "
"Expecting %u.\n",
modname, __FUNCTION__, cfm->version, CFM_VERSION);
return -EINVAL;
}
/* Verify firmware module length and checksum */
cksum = checksum((u8*)&cfm->info, sizeof(struct cycx_fw_info) +
cfm->info.codesize);
/*
FIXME cfm->info.codesize is off by 2
if (((len - sizeof(struct cycx_firmware) - 1) != cfm->info.codesize) ||
*/
if (cksum != cfm->checksum) {
printk(KERN_ERR "%s:%s: firmware corrupted!\n",
modname, __FUNCTION__);
printk(KERN_ERR " cdsize = 0x%x (expected 0x%lx)\n",
len - (int)sizeof(struct cycx_firmware) - 1,
cfm->info.codesize);
printk(KERN_ERR " chksum = 0x%x (expected 0x%x)\n",
cksum, cfm->checksum);
return -EINVAL;
}
/* If everything is ok, set reset, data and code pointers */
img_hdr = (struct cycx_fw_header *)&cfm->image;
#ifdef FIRMWARE_DEBUG
printk(KERN_INFO "%s:%s: image sizes\n", __FUNCTION__, modname);
printk(KERN_INFO " reset=%lu\n", img_hdr->reset_size);
printk(KERN_INFO " data=%lu\n", img_hdr->data_size);
printk(KERN_INFO " code=%lu\n", img_hdr->code_size);
#endif
reset_image = ((u8 *)img_hdr) + sizeof(struct cycx_fw_header);
data_image = reset_image + img_hdr->reset_size;
code_image = data_image + img_hdr->data_size;
/*---- Start load ----*/
/* Announce */
printk(KERN_INFO "%s: loading firmware %s (ID=%u)...\n", modname,
cfm->descr[0] ? cfm->descr : "unknown firmware",
cfm->info.codeid);
for (i = 0 ; i < 5 ; i++) {
/* Reset Cyclom hardware */
if (!reset_cyc2x(hw->dpmbase)) {
printk(KERN_ERR "%s: dpm problem or board not found\n",
modname);
return -EINVAL;
}
/* Load reset.bin */
cycx_reset_boot(hw->dpmbase, reset_image, img_hdr->reset_size);
/* reset is waiting for boot */
writew(GEN_POWER_ON, pt_cycld);
msleep_interruptible(1 * 1000);
for (j = 0 ; j < 3 ; j++)
if (!readw(pt_cycld))
goto reset_loaded;
else
msleep_interruptible(1 * 1000);
}
printk(KERN_ERR "%s: reset not started.\n", modname);
return -EINVAL;
reset_loaded:
/* Load data.bin */
if (cycx_data_boot(hw->dpmbase, data_image, img_hdr->data_size)) {
printk(KERN_ERR "%s: cannot load data file.\n", modname);
return -EINVAL;
}
/* Load code.bin */
if (cycx_code_boot(hw->dpmbase, code_image, img_hdr->code_size)) {
printk(KERN_ERR "%s: cannot load code file.\n", modname);
return -EINVAL;
}
/* Prepare boot-time configuration data */
cycx_bootcfg(hw);
/* kick-off CPU */
cycx_start(hw->dpmbase);
/* Arthur Ganzert's tip: wait a while after the firmware loading...
seg abr 26 17:17:12 EST 1999 - acme */
msleep_interruptible(7 * 1000);
printk(KERN_INFO "%s: firmware loaded!\n", modname);
/* enable interrupts */
cycx_inten(hw);
return 0;
}
/* Prepare boot-time firmware configuration data.
* o initialize configuration data area
From async.doc - V_3.4.0 - 07/18/1994
- As of now, only static buffers are available to the user.
So, the bit VD_RXDIRC must be set in 'valid'. That means that user
wants to use the static transmission and reception buffers. */
static void cycx_bootcfg(struct cycx_hw *hw)
{
/* use fixed buffers */
writeb(FIXED_BUFFERS, hw->dpmbase + CONF_OFFSET);
}
/* Detect Cyclom 2x adapter.
* Following tests are used to detect Cyclom 2x adapter:
* to be completed based on the tests done below
* Return 1 if detected o.k. or 0 if failed.
* Note: This test is destructive! Adapter will be left in shutdown
* state after the test. */
static int detect_cyc2x(void __iomem *addr)
{
reset_cyc2x(addr);
return memory_exists(addr);
}
/* Miscellaneous */
/* Get option's index into the options list.
* Return option's index (1 .. N) or zero if option is invalid. */
static int get_option_index(long *optlist, long optval)
{
int i = 1;
for (; i <= optlist[0]; ++i)
if (optlist[i] == optval)
return i;
return 0;
}
/* Reset adapter's CPU. */
static int reset_cyc2x(void __iomem *addr)
{
writeb(0, addr + RST_ENABLE);
msleep_interruptible(2 * 1000);
writeb(0, addr + RST_DISABLE);
msleep_interruptible(2 * 1000);
return memory_exists(addr);
}
/* Calculate 16-bit CRC using CCITT polynomial. */
static u16 checksum(u8 *buf, u32 len)
{
u16 crc = 0;
u16 mask, flag;
for (; len; --len, ++buf)
for (mask = 0x80; mask; mask >>= 1) {
flag = (crc & 0x8000);
crc <<= 1;
crc |= ((*buf & mask) ? 1 : 0);
if (flag)
crc ^= 0x1021;
}
return crc;
}
module_init(cycx_drv_init);
module_exit(cycx_drv_cleanup);
/* End */
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