+++ /dev/null
-/*
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/delay.h>
-
-#include <asm/gptimers.h>
-#include <asm/portmux.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/trigger.h>
-
-#include "iio-trig-bfin-timer.h"
-
-struct bfin_timer {
- unsigned short id, bit;
- unsigned long irqbit;
- int irq;
- int pin;
-};
-
-/*
- * this covers all hardware timer configurations on
- * all Blackfin derivatives out there today
- */
-
-static struct bfin_timer iio_bfin_timer_code[MAX_BLACKFIN_GPTIMERS] = {
- {TIMER0_id, TIMER0bit, TIMER_STATUS_TIMIL0, IRQ_TIMER0, P_TMR0},
- {TIMER1_id, TIMER1bit, TIMER_STATUS_TIMIL1, IRQ_TIMER1, P_TMR1},
- {TIMER2_id, TIMER2bit, TIMER_STATUS_TIMIL2, IRQ_TIMER2, P_TMR2},
-#if (MAX_BLACKFIN_GPTIMERS > 3)
- {TIMER3_id, TIMER3bit, TIMER_STATUS_TIMIL3, IRQ_TIMER3, P_TMR3},
- {TIMER4_id, TIMER4bit, TIMER_STATUS_TIMIL4, IRQ_TIMER4, P_TMR4},
- {TIMER5_id, TIMER5bit, TIMER_STATUS_TIMIL5, IRQ_TIMER5, P_TMR5},
- {TIMER6_id, TIMER6bit, TIMER_STATUS_TIMIL6, IRQ_TIMER6, P_TMR6},
- {TIMER7_id, TIMER7bit, TIMER_STATUS_TIMIL7, IRQ_TIMER7, P_TMR7},
-#endif
-#if (MAX_BLACKFIN_GPTIMERS > 8)
- {TIMER8_id, TIMER8bit, TIMER_STATUS_TIMIL8, IRQ_TIMER8, P_TMR8},
- {TIMER9_id, TIMER9bit, TIMER_STATUS_TIMIL9, IRQ_TIMER9, P_TMR9},
- {TIMER10_id, TIMER10bit, TIMER_STATUS_TIMIL10, IRQ_TIMER10, P_TMR10},
-#if (MAX_BLACKFIN_GPTIMERS > 11)
- {TIMER11_id, TIMER11bit, TIMER_STATUS_TIMIL11, IRQ_TIMER11, P_TMR11},
-#endif
-#endif
-};
-
-struct bfin_tmr_state {
- struct iio_trigger *trig;
- struct bfin_timer *t;
- unsigned int timer_num;
- bool output_enable;
- unsigned int duty;
- int irq;
-};
-
-static int iio_bfin_tmr_set_state(struct iio_trigger *trig, bool state)
-{
- struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
-
- if (get_gptimer_period(st->t->id) == 0)
- return -EINVAL;
-
- if (state)
- enable_gptimers(st->t->bit);
- else
- disable_gptimers(st->t->bit);
-
- return 0;
-}
-
-static ssize_t frequency_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct iio_trigger *trig = to_iio_trigger(dev);
- struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
- unsigned int val;
- bool enabled;
- int ret;
-
- ret = kstrtouint(buf, 10, &val);
- if (ret)
- return ret;
-
- if (val > 100000)
- return -EINVAL;
-
- enabled = get_enabled_gptimers() & st->t->bit;
-
- if (enabled)
- disable_gptimers(st->t->bit);
-
- if (!val)
- return count;
-
- val = get_sclk() / val;
- if (val <= 4 || val <= st->duty)
- return -EINVAL;
-
- set_gptimer_period(st->t->id, val);
- set_gptimer_pwidth(st->t->id, val - st->duty);
-
- if (enabled)
- enable_gptimers(st->t->bit);
-
- return count;
-}
-
-static ssize_t frequency_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_trigger *trig = to_iio_trigger(dev);
- struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
- unsigned int period = get_gptimer_period(st->t->id);
- unsigned long val;
-
- if (!period)
- val = 0;
- else
- val = get_sclk() / get_gptimer_period(st->t->id);
-
- return sprintf(buf, "%lu\n", val);
-}
-
-static DEVICE_ATTR_RW(frequency);
-
-static struct attribute *iio_bfin_tmr_trigger_attrs[] = {
- &dev_attr_frequency.attr,
- NULL,
-};
-
-static const struct attribute_group iio_bfin_tmr_trigger_attr_group = {
- .attrs = iio_bfin_tmr_trigger_attrs,
-};
-
-static const struct attribute_group *iio_bfin_tmr_trigger_attr_groups[] = {
- &iio_bfin_tmr_trigger_attr_group,
- NULL
-};
-
-static irqreturn_t iio_bfin_tmr_trigger_isr(int irq, void *devid)
-{
- struct bfin_tmr_state *st = devid;
-
- clear_gptimer_intr(st->t->id);
- iio_trigger_poll(st->trig);
-
- return IRQ_HANDLED;
-}
-
-static int iio_bfin_tmr_get_number(int irq)
-{
- int i;
-
- for (i = 0; i < MAX_BLACKFIN_GPTIMERS; i++)
- if (iio_bfin_timer_code[i].irq == irq)
- return i;
-
- return -ENODEV;
-}
-
-static const struct iio_trigger_ops iio_bfin_tmr_trigger_ops = {
- .set_trigger_state = iio_bfin_tmr_set_state,
-};
-
-static int iio_bfin_tmr_trigger_probe(struct platform_device *pdev)
-{
- struct iio_bfin_timer_trigger_pdata *pdata;
- struct bfin_tmr_state *st;
- unsigned int config;
- int ret;
-
- st = devm_kzalloc(&pdev->dev, sizeof(*st), GFP_KERNEL);
- if (!st)
- return -ENOMEM;
-
- st->irq = platform_get_irq(pdev, 0);
- if (st->irq < 0) {
- dev_err(&pdev->dev, "No IRQs specified");
- return st->irq;
- }
-
- ret = iio_bfin_tmr_get_number(st->irq);
- if (ret < 0)
- return ret;
-
- st->timer_num = ret;
- st->t = &iio_bfin_timer_code[st->timer_num];
-
- st->trig = iio_trigger_alloc("bfintmr%d", st->timer_num);
- if (!st->trig)
- return -ENOMEM;
-
- st->trig->ops = &iio_bfin_tmr_trigger_ops;
- st->trig->dev.groups = iio_bfin_tmr_trigger_attr_groups;
- iio_trigger_set_drvdata(st->trig, st);
- ret = iio_trigger_register(st->trig);
- if (ret)
- goto out;
-
- ret = request_irq(st->irq, iio_bfin_tmr_trigger_isr,
- 0, st->trig->name, st);
- if (ret) {
- dev_err(&pdev->dev,
- "request IRQ-%d failed", st->irq);
- goto out1;
- }
-
- config = PWM_OUT | PERIOD_CNT | IRQ_ENA;
-
- pdata = dev_get_platdata(&pdev->dev);
- if (pdata && pdata->output_enable) {
- unsigned long long val;
-
- st->output_enable = true;
-
- ret = peripheral_request(st->t->pin, st->trig->name);
- if (ret)
- goto out_free_irq;
-
- val = (unsigned long long)get_sclk() * pdata->duty_ns;
- do_div(val, NSEC_PER_SEC);
- st->duty = val;
-
- /**
- * The interrupt will be generated at the end of the period,
- * since we want the interrupt to be generated at end of the
- * pulse we invert both polarity and duty cycle, so that the
- * pulse will be generated directly before the interrupt.
- */
- if (pdata->active_low)
- config |= PULSE_HI;
- } else {
- st->duty = 1;
- config |= OUT_DIS;
- }
-
- set_gptimer_config(st->t->id, config);
-
- dev_info(&pdev->dev, "iio trigger Blackfin TMR%d, IRQ-%d",
- st->timer_num, st->irq);
- platform_set_drvdata(pdev, st);
-
- return 0;
-out_free_irq:
- free_irq(st->irq, st);
-out1:
- iio_trigger_unregister(st->trig);
-out:
- iio_trigger_free(st->trig);
- return ret;
-}
-
-static int iio_bfin_tmr_trigger_remove(struct platform_device *pdev)
-{
- struct bfin_tmr_state *st = platform_get_drvdata(pdev);
-
- disable_gptimers(st->t->bit);
- if (st->output_enable)
- peripheral_free(st->t->pin);
- free_irq(st->irq, st);
- iio_trigger_unregister(st->trig);
- iio_trigger_free(st->trig);
-
- return 0;
-}
-
-static struct platform_driver iio_bfin_tmr_trigger_driver = {
- .driver = {
- .name = "iio_bfin_tmr_trigger",
- },
- .probe = iio_bfin_tmr_trigger_probe,
- .remove = iio_bfin_tmr_trigger_remove,
-};
-
-module_platform_driver(iio_bfin_tmr_trigger_driver);
-
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Blackfin system timer based trigger for the iio subsystem");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:iio-trig-bfin-timer");
projects / openwrt / staging / blogic.git / commitdiff