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Linux/arch/arm/mach-netx/pfifo.c

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  1 /*
  2  * arch/arm/mach-netx/pfifo.c
  3  *
  4  * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2
  8  * as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 18  */
 19 
 20 #include <linux/init.h>
 21 #include <linux/module.h>
 22 #include <linux/mutex.h>
 23 #include <linux/io.h>
 24 
 25 #include <mach/hardware.h>
 26 #include <mach/netx-regs.h>
 27 #include <mach/pfifo.h>
 28 
 29 static DEFINE_MUTEX(pfifo_lock);
 30 
 31 static unsigned int pfifo_used = 0;
 32 
 33 int pfifo_request(unsigned int pfifo_mask)
 34 {
 35         int err = 0;
 36         unsigned int val;
 37 
 38         mutex_lock(&pfifo_lock);
 39 
 40         if (pfifo_mask & pfifo_used) {
 41                 err = -EBUSY;
 42                 goto out;
 43         }
 44 
 45         pfifo_used |= pfifo_mask;
 46 
 47         val = readl(NETX_PFIFO_RESET);
 48         writel(val | pfifo_mask, NETX_PFIFO_RESET);
 49         writel(val, NETX_PFIFO_RESET);
 50 
 51 out:
 52         mutex_unlock(&pfifo_lock);
 53         return err;
 54 }
 55 
 56 void pfifo_free(unsigned int pfifo_mask)
 57 {
 58         mutex_lock(&pfifo_lock);
 59         pfifo_used &= ~pfifo_mask;
 60         mutex_unlock(&pfifo_lock);
 61 }
 62 
 63 EXPORT_SYMBOL(pfifo_push);
 64 EXPORT_SYMBOL(pfifo_pop);
 65 EXPORT_SYMBOL(pfifo_fill_level);
 66 EXPORT_SYMBOL(pfifo_empty);
 67 EXPORT_SYMBOL(pfifo_request);
 68 EXPORT_SYMBOL(pfifo_free);
 69 

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