166 lines
4.6 KiB
C
166 lines
4.6 KiB
C
/*
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* Sets up interrupt handlers for various hardware switches which are
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* connected to interrupt lines.
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*
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* Copyright 2005-2207 PMC-Sierra, 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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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <msp_int.h>
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#include <msp_regs.h>
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#include <msp_regops.h>
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/* For hwbutton_interrupt->initial_state */
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#define HWBUTTON_HI 0x1
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#define HWBUTTON_LO 0x2
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/*
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* This struct describes a hardware button
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*/
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struct hwbutton_interrupt {
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char *name; /* Name of button */
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int irq; /* Actual LINUX IRQ */
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int eirq; /* Extended IRQ number (0-7) */
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int initial_state; /* The "normal" state of the switch */
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void (*handle_hi)(void *); /* Handler: switch input has gone HI */
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void (*handle_lo)(void *); /* Handler: switch input has gone LO */
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void *data; /* Optional data to pass to handler */
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};
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#ifdef CONFIG_PMC_MSP7120_GW
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extern void msp_restart(char *);
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static void softreset_push(void *data)
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{
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printk(KERN_WARNING "SOFTRESET switch was pushed\n");
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/*
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* In the future you could move this to the release handler,
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* timing the difference between the 'push' and 'release', and only
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* doing this ungraceful restart if the button has been down for
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* a certain amount of time; otherwise doing a graceful restart.
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*/
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msp_restart(NULL);
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}
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static void softreset_release(void *data)
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{
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printk(KERN_WARNING "SOFTRESET switch was released\n");
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/* Do nothing */
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}
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static void standby_on(void *data)
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{
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printk(KERN_WARNING "STANDBY switch was set to ON (not implemented)\n");
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/* TODO: Put board in standby mode */
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}
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static void standby_off(void *data)
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{
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printk(KERN_WARNING
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"STANDBY switch was set to OFF (not implemented)\n");
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/* TODO: Take out of standby mode */
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}
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static struct hwbutton_interrupt softreset_sw = {
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.name = "Softreset button",
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.irq = MSP_INT_EXT0,
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.eirq = 0,
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.initial_state = HWBUTTON_HI,
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.handle_hi = softreset_release,
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.handle_lo = softreset_push,
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.data = NULL,
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};
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static struct hwbutton_interrupt standby_sw = {
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.name = "Standby switch",
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.irq = MSP_INT_EXT1,
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.eirq = 1,
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.initial_state = HWBUTTON_HI,
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.handle_hi = standby_off,
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.handle_lo = standby_on,
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.data = NULL,
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};
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#endif /* CONFIG_PMC_MSP7120_GW */
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static irqreturn_t hwbutton_handler(int irq, void *data)
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{
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struct hwbutton_interrupt *hirq = data;
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unsigned long cic_ext = *CIC_EXT_CFG_REG;
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if (CIC_EXT_IS_ACTIVE_HI(cic_ext, hirq->eirq)) {
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/* Interrupt: pin is now HI */
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CIC_EXT_SET_ACTIVE_LO(cic_ext, hirq->eirq);
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hirq->handle_hi(hirq->data);
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} else {
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/* Interrupt: pin is now LO */
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CIC_EXT_SET_ACTIVE_HI(cic_ext, hirq->eirq);
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hirq->handle_lo(hirq->data);
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}
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/*
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* Invert the POLARITY of this level interrupt to ack the interrupt
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* Thus next state change will invoke the opposite message
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*/
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*CIC_EXT_CFG_REG = cic_ext;
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return IRQ_HANDLED;
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}
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static int msp_hwbutton_register(struct hwbutton_interrupt *hirq)
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{
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unsigned long cic_ext;
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if (hirq->handle_hi == NULL || hirq->handle_lo == NULL)
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return -EINVAL;
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cic_ext = *CIC_EXT_CFG_REG;
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CIC_EXT_SET_TRIGGER_LEVEL(cic_ext, hirq->eirq);
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if (hirq->initial_state == HWBUTTON_HI)
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CIC_EXT_SET_ACTIVE_LO(cic_ext, hirq->eirq);
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else
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CIC_EXT_SET_ACTIVE_HI(cic_ext, hirq->eirq);
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*CIC_EXT_CFG_REG = cic_ext;
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return request_irq(hirq->irq, hwbutton_handler, 0,
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hirq->name, hirq);
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}
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static int __init msp_hwbutton_setup(void)
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{
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#ifdef CONFIG_PMC_MSP7120_GW
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msp_hwbutton_register(&softreset_sw);
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msp_hwbutton_register(&standby_sw);
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#endif
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return 0;
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}
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subsys_initcall(msp_hwbutton_setup);
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