diff options
Diffstat (limited to 'drivers/staging/vme/devices/vme_pio2_cntr.c')
| -rw-r--r-- | drivers/staging/vme/devices/vme_pio2_cntr.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/staging/vme/devices/vme_pio2_cntr.c b/drivers/staging/vme/devices/vme_pio2_cntr.c new file mode 100644 index 000000000000..08e0d59806ca --- /dev/null +++ b/drivers/staging/vme/devices/vme_pio2_cntr.c @@ -0,0 +1,71 @@ +/* + * GE PIO2 Counter Driver + * + * Author: Martyn Welch <martyn.welch@ge.com> + * Copyright 2009 GE Intelligent Platforms Embedded Systems, Inc. + * + * 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. + * + * The PIO-2 has 6 counters, currently this code just disables the interrupts + * and leaves them alone. + * + */ + +#include <linux/device.h> +#include <linux/types.h> +#include <linux/gpio.h> + +#include "../vme.h" +#include "vme_pio2.h" + +static int pio2_cntr_irq_set(struct pio2_card *card, int id) +{ + int retval; + u8 data; + + data = PIO2_CNTR_SC_DEV[id] | PIO2_CNTR_RW_BOTH | card->cntr[id].mode; + retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_CTRL[id]); + if (retval < 0) + return retval; + + data = card->cntr[id].count & 0xFF; + retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_DATA[id]); + if (retval < 0) + return retval; + + data = (card->cntr[id].count >> 8) & 0xFF; + retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_DATA[id]); + if (retval < 0) + return retval; + + return 0; +} + +int pio2_cntr_reset(struct pio2_card *card) +{ + int i, retval = 0; + u8 reg; + + /* Clear down all timers */ + for (i = 0; i < 6; i++) { + card->cntr[i].mode = PIO2_CNTR_MODE5; + card->cntr[i].count = 0; + retval = pio2_cntr_irq_set(card, i); + if (retval < 0) + return retval; + } + + /* Ensure all counter interrupts are cleared */ + do { + retval = vme_master_read(card->window, ®, 1, + PIO2_REGS_INT_STAT_CNTR); + if (retval < 0) + return retval; + } while (reg != 0); + + return retval; +} + |