2011-11-08 09:54:25 +00:00
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/*
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* GE PIO2 Counter Driver
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*
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* Author: Martyn Welch <martyn.welch@ge.com>
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* Copyright 2009 GE Intelligent Platforms Embedded Systems, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The PIO-2 has 6 counters, currently this code just disables the interrupts
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* and leaves them alone.
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*
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*/
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#include <linux/device.h>
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#include <linux/types.h>
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#include <linux/gpio.h>
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2012-04-26 19:34:58 +00:00
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#include <linux/vme.h>
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2011-11-08 09:54:25 +00:00
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#include "vme_pio2.h"
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static int pio2_cntr_irq_set(struct pio2_card *card, int id)
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{
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int retval;
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u8 data;
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data = PIO2_CNTR_SC_DEV[id] | PIO2_CNTR_RW_BOTH | card->cntr[id].mode;
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retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_CTRL[id]);
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if (retval < 0)
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return retval;
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data = card->cntr[id].count & 0xFF;
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retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_DATA[id]);
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if (retval < 0)
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return retval;
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data = (card->cntr[id].count >> 8) & 0xFF;
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retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_DATA[id]);
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if (retval < 0)
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return retval;
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return 0;
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}
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int pio2_cntr_reset(struct pio2_card *card)
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{
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int i, retval = 0;
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u8 reg;
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/* Clear down all timers */
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for (i = 0; i < 6; i++) {
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card->cntr[i].mode = PIO2_CNTR_MODE5;
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card->cntr[i].count = 0;
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retval = pio2_cntr_irq_set(card, i);
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if (retval < 0)
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return retval;
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}
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/* Ensure all counter interrupts are cleared */
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do {
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retval = vme_master_read(card->window, ®, 1,
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PIO2_REGS_INT_STAT_CNTR);
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if (retval < 0)
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return retval;
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} while (reg != 0);
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return retval;
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}
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