[PATCH 4/6] pcmcia: honor saved flags in yenta_socket's I365_CSCINT register

[Dominik Brodowski]

From: Jens Künzer <Jens.Kuenzer at fpga.homeip.net>

Instead of overwriting the I365_CSCINT register, save the old value and
merely change the bits we care about.

Part 1 of a series to allow the ISA irq to be used for Cardbus devices
if the socket's PCI irq is unusable.

[linux at dominikbrodowski.net: split up the original patch, commit message]

Signed-off-by: Jens Kuenzer <Jens.Kuenzer at fpga.homeip.net>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
 drivers/pcmcia/i82365.h       |    1 +
 drivers/pcmcia/yenta_socket.c |   15 +++++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/pcmcia/i82365.h b/drivers/pcmcia/i82365.h
index 849ef1b..3f84d7a 100644
--- a/drivers/pcmcia/i82365.h
+++ b/drivers/pcmcia/i82365.h
@@ -95,6 +95,7 @@
 #define I365_CSC_DETECT	0x08
 #define I365_CSC_ANY	0x0F
 #define I365_CSC_GPI	0x10
+#define I365_CSC_IRQ_MASK	0xF0
 
 /* Flags for I365_ADDRWIN */
 #define I365_ENA_IO(map)	(0x40 << (map))
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 967c766..42f6763 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -356,7 +356,9 @@ static int yenta_set_socket(struct pcmcia_socket *sock, socket_state_t *state)
 			exca_writeb(socket, I365_POWER, reg);
 
 		/* CSC interrupt: no ISA irq for CSC */
-		reg = I365_CSC_DETECT;
+		reg = exca_readb(socket, I365_CSCINT);
+		reg &= I365_CSC_IRQ_MASK;
+		reg |= I365_CSC_DETECT;
 		if (state->flags & SS_IOCARD) {
 			if (state->csc_mask & SS_STSCHG)
 				reg |= I365_CSC_STSCHG;
@@ -912,6 +914,7 @@ static unsigned int yenta_probe_irq(struct yenta_socket *socket, u32 isa_irq_mas
 	int i;
 	unsigned long val;
 	u32 mask;
+	u8 reg;
 
 	/*
 	 * Probe for usable interrupts using the force
@@ -919,6 +922,7 @@ static unsigned int yenta_probe_irq(struct yenta_socket *socket, u32 isa_irq_mas
 	 */
 	cb_writel(socket, CB_SOCKET_EVENT, -1);
 	cb_writel(socket, CB_SOCKET_MASK, CB_CSTSMASK);
+	reg = exca_readb(socket, I365_CSCINT);
 	exca_writeb(socket, I365_CSCINT, 0);
 	val = probe_irq_on() & isa_irq_mask;
 	for (i = 1; i < 16; i++) {
@@ -930,7 +934,7 @@ static unsigned int yenta_probe_irq(struct yenta_socket *socket, u32 isa_irq_mas
 		cb_writel(socket, CB_SOCKET_EVENT, -1);
 	}
 	cb_writel(socket, CB_SOCKET_MASK, 0);
-	exca_writeb(socket, I365_CSCINT, 0);
+	exca_writeb(socket, I365_CSCINT, reg);
 
 	mask = probe_irq_mask(val) & 0xffff;
 
@@ -967,6 +971,8 @@ static irqreturn_t yenta_probe_handler(int irq, void *dev_id)
 /* probes the PCI interrupt, use only on override functions */
 static int yenta_probe_cb_irq(struct yenta_socket *socket)
 {
+	u8 reg;
+
 	if (!socket->cb_irq)
 		return -1;
 
@@ -979,7 +985,8 @@ static int yenta_probe_cb_irq(struct yenta_socket *socket)
 	}
 
 	/* generate interrupt, wait */
-	exca_writeb(socket, I365_CSCINT, I365_CSC_STSCHG);
+	reg = exca_readb(socket, I365_CSCINT);
+	exca_writeb(socket, I365_CSCINT, reg | I365_CSC_STSCHG);
 	cb_writel(socket, CB_SOCKET_EVENT, -1);
 	cb_writel(socket, CB_SOCKET_MASK, CB_CSTSMASK);
 	cb_writel(socket, CB_SOCKET_FORCE, CB_FCARDSTS);
@@ -988,7 +995,7 @@ static int yenta_probe_cb_irq(struct yenta_socket *socket)
 
 	/* disable interrupts */
 	cb_writel(socket, CB_SOCKET_MASK, 0);
-	exca_writeb(socket, I365_CSCINT, 0);
+	exca_writeb(socket, I365_CSCINT, reg);
 	cb_writel(socket, CB_SOCKET_EVENT, -1);
 	exca_readb(socket, I365_CSC);
 
-- 
1.6.3.3