diff options
Diffstat (limited to 'drivers/char/hfmodem/refclock.c')
| -rw-r--r-- | drivers/char/hfmodem/refclock.c | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/drivers/char/hfmodem/refclock.c b/drivers/char/hfmodem/refclock.c deleted file mode 100644 index 20153c02b..000000000 --- a/drivers/char/hfmodem/refclock.c +++ /dev/null @@ -1,154 +0,0 @@ -/*****************************************************************************/ - -/* - * refclock.c -- Linux soundcard HF FSK driver, - * Reference clock routines. - * - * Copyright (C) 1997 Thomas Sailer (sailer@ife.ee.ethz.ch) - * Swiss Federal Institute of Technology (ETH), Electronics Lab - * - * 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. - * - * - */ - -/*****************************************************************************/ - -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/time.h> -#include <linux/hfmodem.h> -#include <asm/processor.h> - -/* --------------------------------------------------------------------- */ - -/* - * currently this module is supposed to support both module styles, i.e. - * the old one present up to about 2.1.9, and the new one functioning - * starting with 2.1.21. The reason is I have a kit allowing to compile - * this module also under 2.0.x which was requested by several people. - * This will go in 2.2 - */ -#include <linux/version.h> - -#if LINUX_VERSION_CODE >= 0x20123 -#include <linux/init.h> -#else -#define __init -#define __initdata -#define __initfunc(x) x -#endif - -/* --------------------------------------------------------------------- */ -/* - * command line params - */ - -static unsigned int scale_tvusec = 1UL<<24; - -#ifdef __i386__ -static unsigned int scale_rdtsc = 0; -static int rdtsc_ok = 1; -#endif /* __i386__ */ - -/* --------------------------------------------------------------------- */ - -#ifdef __i386__ -static void __init i386_capability(void) -{ - if (boot_cpu_data.x86_capability & X86_FEATURE_TSC) - rdtsc_ok = 1; - else - printk(KERN_INFO "%s: cpu does not support the rdtsc instruction\n", hfmodem_drvname); -} -#endif /* __i386__ */ - -/* --------------------------------------------------------------------- */ - -void __init hfmodem_refclock_probe(void) -{ -#ifdef __i386__ - if (rdtsc_ok) { - rdtsc_ok = 0; - i386_capability(); - if (rdtsc_ok) { - unsigned int tmp0, tmp1, tmp2, tmp3; - __asm__("rdtsc" : "=a" (tmp0), "=d" (tmp1)); - __asm__("rdtsc" : "=a" (tmp2), "=d" (tmp3)); - if (tmp0 == tmp2 && tmp1 == tmp3) { - rdtsc_ok = 0; - printk(KERN_WARNING "%s: rdtsc unusable, does not change\n", - hfmodem_drvname); - } - } - } - printk(KERN_INFO "%s: using %s as timing source\n", hfmodem_drvname, - rdtsc_ok ? "rdtsc" : "gettimeofday"); -#endif /* __i386__ */ -} - -/* --------------------------------------------------------------------- */ - -void hfmodem_refclock_init(struct hfmodem_state *dev) -{ - struct timeval tv; - - dev->clk.lasttime = 0; -#ifdef __i386__ - if (rdtsc_ok) { - __asm__("rdtsc;" : "=&d" (dev->clk.starttime_hi), "=&a" (dev->clk.starttime_lo)); - return; - } -#endif /* __i386__ */ - do_gettimeofday(&tv); - dev->clk.last_tvusec = tv.tv_usec; - dev->clk.time_cnt = 0; -} - -/* --------------------------------------------------------------------- */ - -hfmodem_time_t hfmodem_refclock_current(struct hfmodem_state *dev, hfmodem_time_t expected, int exp_valid) -{ - struct timeval tv; - hfmodem_time_t curtime; - long diff; - -#ifdef __i386__ - if (rdtsc_ok) { - unsigned int tmp0, tmp1; - unsigned int tmp2, tmp3; - - __asm__("rdtsc;\n\t" - "subl %2,%%eax\n\t" - "sbbl %3,%%edx\n\t" : "=&a" (tmp0), "=&d" (tmp1) - : "m" (dev->clk.starttime_lo), "m" (dev->clk.starttime_hi) : "ax", "dx"); - __asm__("mull %1" : "=d" (tmp2) : "m" (scale_rdtsc), "a" (tmp0) : "ax"); - __asm__("mull %1" : "=a" (tmp3) : "m" (scale_rdtsc), "a" (tmp1) : "dx"); - curtime = tmp2 + tmp3; - goto time_known; - } -#endif /* __i386__ */ - do_gettimeofday(&tv); - dev->clk.time_cnt += (unsigned)(1000000 + tv.tv_usec - dev->clk.last_tvusec) % 1000000; - dev->clk.last_tvusec = tv.tv_usec; - curtime = (dev->clk.time_cnt * scale_tvusec) >> 24; - time_known: - if (exp_valid && abs(diff = (curtime - dev->clk.lasttime - expected)) >= 1000) - printk(KERN_DEBUG "%s: refclock adjustment %ld more than 1ms\n", - hfmodem_drvname, diff); - return (dev->clk.lasttime = curtime); -} - -/* --------------------------------------------------------------------- */ |