[PATCH 42/64] via82cxxx: workaround h/w bugs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Subject: [PATCH] via82cxxx: workaround h/w bugs

Add custom struct ide_tp_ops instance to fix the internal bug of some VIA
chipsets which will reset the device register after changing the nIEN bit
in the device control register.

Based on commit bfce5e0 for pata_via host driver.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
---
 drivers/ide/via82cxxx.c |   57 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

Index: b/drivers/ide/via82cxxx.c
===================================================================
--- a/drivers/ide/via82cxxx.c
+++ b/drivers/ide/via82cxxx.c
@@ -107,6 +107,7 @@ struct via82cxxx_dev
 {
 	struct via_isa_bridge *via_config;
 	unsigned int via_80w;
+	u8 cached_device[2];
 };
 
 /**
@@ -382,10 +383,66 @@ static const struct ide_port_ops via_por
 	.cable_detect		= via82cxxx_cable_detect,
 };
 
+static void via_write_devctl(ide_hwif_t *hwif, u8 ctl)
+{
+	struct via82cxxx_dev *vdev = hwif->host->host_priv;
+
+	outb(ctl, hwif->io_ports.ctl_addr);
+	outb(vdev->cached_device[hwif->channel], hwif->io_ports.device_addr);
+}
+
+static void __via_dev_select(ide_drive_t *drive, u8 select)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct via82cxxx_dev *vdev = hwif->host->host_priv;
+
+	outb(select, hwif->io_ports.device_addr);
+	vdev->cached_device[hwif->channel] = select;
+}
+
+static void via_dev_select(ide_drive_t *drive)
+{
+	__via_dev_select(drive, drive->select | ATA_DEVICE_OBS);
+}
+
+static void via_tf_load(ide_drive_t *drive, struct ide_taskfile *tf, u8 valid)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct ide_io_ports *io_ports = &hwif->io_ports;
+
+	if (valid & IDE_VALID_FEATURE)
+		outb(tf->feature, io_ports->feature_addr);
+	if (valid & IDE_VALID_NSECT)
+		outb(tf->nsect, io_ports->nsect_addr);
+	if (valid & IDE_VALID_LBAL)
+		outb(tf->lbal, io_ports->lbal_addr);
+	if (valid & IDE_VALID_LBAM)
+		outb(tf->lbam, io_ports->lbam_addr);
+	if (valid & IDE_VALID_LBAH)
+		outb(tf->lbah, io_ports->lbah_addr);
+	if (valid & IDE_VALID_DEVICE)
+		__via_dev_select(drive, tf->device);
+}
+
+const struct ide_tp_ops via_tp_ops = {
+	.exec_command		= ide_exec_command,
+	.read_status		= ide_read_status,
+	.read_altstatus		= ide_read_altstatus,
+	.write_devctl		= via_write_devctl,
+
+	.dev_select		= via_dev_select,
+	.tf_load		= via_tf_load,
+	.tf_read		= ide_tf_read,
+
+	.input_data		= ide_input_data,
+	.output_data		= ide_output_data,
+};
+
 static const struct ide_port_info via82cxxx_chipset __devinitdata = {
 	.name		= DRV_NAME,
 	.init_chipset	= init_chipset_via82cxxx,
 	.enablebits	= { { 0x40, 0x02, 0x02 }, { 0x40, 0x01, 0x01 } },
+	.tp_ops		= &via_tp_ops,
 	.port_ops	= &via_port_ops,
 	.host_flags	= IDE_HFLAG_PIO_NO_BLACKLIST |
 			  IDE_HFLAG_POST_SET_MODE |
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Filesystems]     [Linux SCSI]     [Linux RAID]     [Git]     [Kernel Newbies]     [Linux Newbie]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Samba]     [Device Mapper]

  Powered by Linux