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authorJosh Boyer <jwboyer@linux.vnet.ibm.com>2008-09-04 04:08:20 +0000
committerJosh Boyer <jwboyer@linux.vnet.ibm.com>2008-09-30 09:23:15 -0400
commitfbcc4bacee30cad4e4a13d05492a9ed0c9c3e8c7 (patch)
tree04e9f7baf7db1c2f1b7d49af72e353a5ecc1e2f4 /drivers/net/ibm_newemac/mal.c
parentec4f9945b5b3e9e491a04eb1efe1c959371fa6de (diff)
downloadop-kernel-dev-fbcc4bacee30cad4e4a13d05492a9ed0c9c3e8c7.zip
op-kernel-dev-fbcc4bacee30cad4e4a13d05492a9ed0c9c3e8c7.tar.gz
ibm_newemac: MAL support for PowerPC 405EZ
The PowerPC 405EZ SoC has some differences in the interrupt layout and handling for the MAL. The SERR, TXDE, and RXDE interrupts are OR'd into a single interrupt. Also, due to the possibility for interrupt coalescing, the TXEOB and RXEOB interrupts require an interrupt bit to be cleared in the ICINTSTAT SDR. This sets the proper MAL feature bits for 405EZ boards, and adds a common shared handler for SERR, TXDE, and RXDE. The defines for the ICINTSTAT DCR are added to the proper header file as well. This has been adapted from code originally written by Stefan Roese. Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/net/ibm_newemac/mal.c')
-rw-r--r--drivers/net/ibm_newemac/mal.c60
1 files changed, 55 insertions, 5 deletions
diff --git a/drivers/net/ibm_newemac/mal.c b/drivers/net/ibm_newemac/mal.c
index 10c267b..1839d3f 100644
--- a/drivers/net/ibm_newemac/mal.c
+++ b/drivers/net/ibm_newemac/mal.c
@@ -28,6 +28,7 @@
#include <linux/delay.h>
#include "core.h"
+#include <asm/dcr-regs.h>
static int mal_count;
@@ -279,6 +280,10 @@ static irqreturn_t mal_txeob(int irq, void *dev_instance)
mal_schedule_poll(mal);
set_mal_dcrn(mal, MAL_TXEOBISR, r);
+ if (mal_has_feature(mal, MAL_FTR_CLEAR_ICINTSTAT))
+ mtdcri(SDR0, DCRN_SDR_ICINTSTAT,
+ (mfdcri(SDR0, DCRN_SDR_ICINTSTAT) | ICINTSTAT_ICTX));
+
return IRQ_HANDLED;
}
@@ -293,6 +298,10 @@ static irqreturn_t mal_rxeob(int irq, void *dev_instance)
mal_schedule_poll(mal);
set_mal_dcrn(mal, MAL_RXEOBISR, r);
+ if (mal_has_feature(mal, MAL_FTR_CLEAR_ICINTSTAT))
+ mtdcri(SDR0, DCRN_SDR_ICINTSTAT,
+ (mfdcri(SDR0, DCRN_SDR_ICINTSTAT) | ICINTSTAT_ICRX));
+
return IRQ_HANDLED;
}
@@ -336,6 +345,25 @@ static irqreturn_t mal_rxde(int irq, void *dev_instance)
return IRQ_HANDLED;
}
+static irqreturn_t mal_int(int irq, void *dev_instance)
+{
+ struct mal_instance *mal = dev_instance;
+ u32 esr = get_mal_dcrn(mal, MAL_ESR);
+
+ if (esr & MAL_ESR_EVB) {
+ /* descriptor error */
+ if (esr & MAL_ESR_DE) {
+ if (esr & MAL_ESR_CIDT)
+ return mal_rxde(irq, dev_instance);
+ else
+ return mal_txde(irq, dev_instance);
+ } else { /* SERR */
+ return mal_serr(irq, dev_instance);
+ }
+ }
+ return IRQ_HANDLED;
+}
+
void mal_poll_disable(struct mal_instance *mal, struct mal_commac *commac)
{
/* Spinlock-type semantics: only one caller disable poll at a time */
@@ -493,6 +521,8 @@ static int __devinit mal_probe(struct of_device *ofdev,
unsigned int dcr_base;
const u32 *prop;
u32 cfg;
+ unsigned long irqflags;
+ irq_handler_t hdlr_serr, hdlr_txde, hdlr_rxde;
mal = kzalloc(sizeof(struct mal_instance), GFP_KERNEL);
if (!mal) {
@@ -542,11 +572,21 @@ static int __devinit mal_probe(struct of_device *ofdev,
goto fail;
}
+ if (of_device_is_compatible(ofdev->node, "ibm,mcmal-405ez"))
+ mal->features |= (MAL_FTR_CLEAR_ICINTSTAT |
+ MAL_FTR_COMMON_ERR_INT);
+
mal->txeob_irq = irq_of_parse_and_map(ofdev->node, 0);
mal->rxeob_irq = irq_of_parse_and_map(ofdev->node, 1);
mal->serr_irq = irq_of_parse_and_map(ofdev->node, 2);
- mal->txde_irq = irq_of_parse_and_map(ofdev->node, 3);
- mal->rxde_irq = irq_of_parse_and_map(ofdev->node, 4);
+
+ if (mal_has_feature(mal, MAL_FTR_COMMON_ERR_INT)) {
+ mal->txde_irq = mal->rxde_irq = mal->serr_irq;
+ } else {
+ mal->txde_irq = irq_of_parse_and_map(ofdev->node, 3);
+ mal->rxde_irq = irq_of_parse_and_map(ofdev->node, 4);
+ }
+
if (mal->txeob_irq == NO_IRQ || mal->rxeob_irq == NO_IRQ ||
mal->serr_irq == NO_IRQ || mal->txde_irq == NO_IRQ ||
mal->rxde_irq == NO_IRQ) {
@@ -608,16 +648,26 @@ static int __devinit mal_probe(struct of_device *ofdev,
sizeof(struct mal_descriptor) *
mal_rx_bd_offset(mal, i));
- err = request_irq(mal->serr_irq, mal_serr, 0, "MAL SERR", mal);
+ if (mal_has_feature(mal, MAL_FTR_COMMON_ERR_INT)) {
+ irqflags = IRQF_SHARED;
+ hdlr_serr = hdlr_txde = hdlr_rxde = mal_int;
+ } else {
+ irqflags = 0;
+ hdlr_serr = mal_serr;
+ hdlr_txde = mal_txde;
+ hdlr_rxde = mal_rxde;
+ }
+
+ err = request_irq(mal->serr_irq, hdlr_serr, irqflags, "MAL SERR", mal);
if (err)
goto fail2;
- err = request_irq(mal->txde_irq, mal_txde, 0, "MAL TX DE", mal);
+ err = request_irq(mal->txde_irq, hdlr_txde, irqflags, "MAL TX DE", mal);
if (err)
goto fail3;
err = request_irq(mal->txeob_irq, mal_txeob, 0, "MAL TX EOB", mal);
if (err)
goto fail4;
- err = request_irq(mal->rxde_irq, mal_rxde, 0, "MAL RX DE", mal);
+ err = request_irq(mal->rxde_irq, hdlr_rxde, irqflags, "MAL RX DE", mal);
if (err)
goto fail5;
err = request_irq(mal->rxeob_irq, mal_rxeob, 0, "MAL RX EOB", mal);
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