[E3-hacking] [PATCH v3 2.1/5(7)] OMAP1: Amstrad Delta: update board initialization code for complete modem IRQ GPIO line setup

[Janusz Krzysztofik]

In case of Amstrad Delta modem utilized GPIO line, interrupt is requested from 
standard serial8250 driver code without first requesting the GPIO pin itself. 
Even if it works with default OMAP GPIO interrupt handler, it appeared not 
compatible with recent, optimized version of the board WiP GPIO FIQ handler, 
required for fast processing of interrupts generated by other GPIO pin that a 
serial keyboard clock hangs off.

This patch fills the board specific modem initialization routine with common 
GPIO line reservation and direction setup.

Even if included in the Amstrad Delta FIQ patch set, can be applied alone in 
advance as well, possibly as a fix.

Created and tested against linux-2.6.34-rc4.

Signed-off-by: Janusz Krzysztofik <jkrzyszt at tis.icnet.pl>
---

 arch/arm/mach-omap1/board-ams-delta.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- git.orig/arch/arm/mach-omap1/board-ams-delta.c	2010-04-14 03:07:13.000000000 +0200
+++ git/arch/arm/mach-omap1/board-ams-delta.c	2010-04-14 21:58:12.000000000 +0200
@@ -263,8 +263,18 @@ static struct platform_device ams_delta_
 
 static int __init ams_delta_modem_init(void)
 {
+	int err;
+
 	omap_cfg_reg(M14_1510_GPIO2);
-	ams_delta_modem_ports[0].irq = gpio_to_irq(2);
+	ams_delta_modem_ports[0].irq =
+			gpio_to_irq(AMS_DELTA_GPIO_PIN_MODEM_IRQ);
+
+	err = gpio_request(AMS_DELTA_GPIO_PIN_MODEM_IRQ, "modem");
+	if (err) {
+		pr_err("Couldn't request gpio pin for modem\n");
+		return err;
+	}
+	gpio_direction_input(AMS_DELTA_GPIO_PIN_MODEM_IRQ);
 
 	ams_delta_latch2_write(
 		AMS_DELTA_LATCH2_MODEM_NRESET | AMS_DELTA_LATCH2_MODEM_CODEC,