Initial import

1 files changed, 165 insertions, 0 deletions

diff --git a/arch/mips/pmcs-msp71xx/msp_hwbutton.c b/arch/mips/pmcs-msp71xx/msp_hwbutton.c
new file mode 100644
index 000000000..bb57ed9ea
--- /dev/null
+++ b/arch/mips/pmcs-msp71xx/msp_hwbutton.c
@@ -0,0 +1,165 @@
+/*
+ * Sets up interrupt handlers for various hardware switches which are
+ * connected to interrupt lines.
+ *
+ * Copyright 2005-2207 PMC-Sierra, 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.
+ *
+ *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <msp_int.h>
+#include <msp_regs.h>
+#include <msp_regops.h>
+
+/* For hwbutton_interrupt->initial_state */
+#define HWBUTTON_HI	0x1
+#define HWBUTTON_LO	0x2
+
+/*
+ * This struct describes a hardware button
+ */
+struct hwbutton_interrupt {
+	char *name;			/* Name of button */
+	int irq;			/* Actual LINUX IRQ */
+	int eirq;			/* Extended IRQ number (0-7) */
+	int initial_state;		/* The "normal" state of the switch */
+	void (*handle_hi)(void *);	/* Handler: switch input has gone HI */
+	void (*handle_lo)(void *);	/* Handler: switch input has gone LO */
+	void *data;			/* Optional data to pass to handler */
+};
+
+#ifdef CONFIG_PMC_MSP7120_GW
+extern void msp_restart(char *);
+
+static void softreset_push(void *data)
+{
+	printk(KERN_WARNING "SOFTRESET switch was pushed\n");
+
+	/*
+	 * In the future you could move this to the release handler,
+	 * timing the difference between the 'push' and 'release', and only
+	 * doing this ungraceful restart if the button has been down for
+	 * a certain amount of time; otherwise doing a graceful restart.
+	 */
+
+	msp_restart(NULL);
+}
+
+static void softreset_release(void *data)
+{
+	printk(KERN_WARNING "SOFTRESET switch was released\n");
+
+	/* Do nothing */
+}
+
+static void standby_on(void *data)
+{
+	printk(KERN_WARNING "STANDBY switch was set to ON (not implemented)\n");
+
+	/* TODO: Put board in standby mode */
+}
+
+static void standby_off(void *data)
+{
+	printk(KERN_WARNING
+		"STANDBY switch was set to OFF (not implemented)\n");
+
+	/* TODO: Take out of standby mode */
+}
+
+static struct hwbutton_interrupt softreset_sw = {
+	.name = "Softreset button",
+	.irq = MSP_INT_EXT0,
+	.eirq = 0,
+	.initial_state = HWBUTTON_HI,
+	.handle_hi = softreset_release,
+	.handle_lo = softreset_push,
+	.data = NULL,
+};
+
+static struct hwbutton_interrupt standby_sw = {
+	.name = "Standby switch",
+	.irq = MSP_INT_EXT1,
+	.eirq = 1,
+	.initial_state = HWBUTTON_HI,
+	.handle_hi = standby_off,
+	.handle_lo = standby_on,
+	.data = NULL,
+};
+#endif /* CONFIG_PMC_MSP7120_GW */
+
+static irqreturn_t hwbutton_handler(int irq, void *data)
+{
+	struct hwbutton_interrupt *hirq = data;
+	unsigned long cic_ext = *CIC_EXT_CFG_REG;
+
+	if (CIC_EXT_IS_ACTIVE_HI(cic_ext, hirq->eirq)) {
+		/* Interrupt: pin is now HI */
+		CIC_EXT_SET_ACTIVE_LO(cic_ext, hirq->eirq);
+		hirq->handle_hi(hirq->data);
+	} else {
+		/* Interrupt: pin is now LO */
+		CIC_EXT_SET_ACTIVE_HI(cic_ext, hirq->eirq);
+		hirq->handle_lo(hirq->data);
+	}
+
+	/*
+	 * Invert the POLARITY of this level interrupt to ack the interrupt
+	 * Thus next state change will invoke the opposite message
+	 */
+	*CIC_EXT_CFG_REG = cic_ext;
+
+	return IRQ_HANDLED;
+}
+
+static int msp_hwbutton_register(struct hwbutton_interrupt *hirq)
+{
+	unsigned long cic_ext;
+
+	if (hirq->handle_hi == NULL || hirq->handle_lo == NULL)
+		return -EINVAL;
+
+	cic_ext = *CIC_EXT_CFG_REG;
+	CIC_EXT_SET_TRIGGER_LEVEL(cic_ext, hirq->eirq);
+	if (hirq->initial_state == HWBUTTON_HI)
+		CIC_EXT_SET_ACTIVE_LO(cic_ext, hirq->eirq);
+	else
+		CIC_EXT_SET_ACTIVE_HI(cic_ext, hirq->eirq);
+	*CIC_EXT_CFG_REG = cic_ext;
+
+	return request_irq(hirq->irq, hwbutton_handler, 0,
+			   hirq->name, hirq);
+}
+
+static int __init msp_hwbutton_setup(void)
+{
+#ifdef CONFIG_PMC_MSP7120_GW
+	msp_hwbutton_register(&softreset_sw);
+	msp_hwbutton_register(&standby_sw);
+#endif
+	return 0;
+}
+
+subsys_initcall(msp_hwbutton_setup);