[PATCH]: via 6421 PATA support done in a rather cleaner fashion

[Alan]

Wants testing... so test and report

Signed-off-by: Alan Cox <alan@xxxxxxxxxx>

--- linux.vanilla-2.6.19-rc6-mm1/drivers/ata/sata_via.c	2006-11-24 13:58:05.000000000 +0000
+++ linux-2.6.19-rc6-mm1/drivers/ata/sata_via.c	2006-12-04 14:57:34.719099648 +0000
@@ -59,11 +59,14 @@
 	SATA_INT_GATE		= 0x41, /* SATA interrupt gating */
 	SATA_NATIVE_MODE	= 0x42, /* Native mode enable */
 	SATA_PATA_SHARING	= 0x49, /* PATA/SATA sharing func ctrl */
-
+	PATA_UDMA_TIMING	= 0xB3, /* PATA timing for DMA/ cable detect */
+	PATA_PIO_TIMING		= 0xAB, /* PATA timing register */
+	
 	PORT0			= (1 << 1),
 	PORT1			= (1 << 0),
 	ALL_PORTS		= PORT0 | PORT1,
-	N_PORTS			= 2,
+	PATA_PORT		= 2,	/* PATA is port 2 */
+	N_PORTS			= 3,
 
 	NATIVE_MODE_ALL		= (1 << 7) | (1 << 6) | (1 << 5) | (1 << 4),
 
@@ -75,6 +78,10 @@
 static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg);
 static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
 static void vt6420_error_handler(struct ata_port *ap);
+static void vt6421_error_handler(struct ata_port *ap);
+static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev);
+static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev);
+static unsigned long vt6421_mode_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long modes);
 
 static const struct pci_device_id svia_pci_tbl[] = {
 	{ PCI_VDEVICE(VIA, 0x0591), vt6420 },
@@ -140,8 +147,12 @@
 	.host_stop		= ata_host_stop,
 };
 
-static const struct ata_port_operations vt6421_sata_ops = {
+static const struct ata_port_operations vt6421_ata_ops = {
 	.port_disable		= ata_port_disable,
+	
+	.set_piomode		= vt6421_set_pio_mode,
+	.set_dmamode		= vt6421_set_dma_mode,
+	.mode_filter		= vt6421_mode_filter,
 
 	.tf_load		= ata_tf_load,
 	.tf_read		= ata_tf_read,
@@ -160,7 +171,7 @@
 
 	.freeze			= ata_bmdma_freeze,
 	.thaw			= ata_bmdma_thaw,
-	.error_handler		= ata_bmdma_error_handler,
+	.error_handler		= vt6421_error_handler,
 	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 
 	.irq_handler		= ata_interrupt,
@@ -278,6 +289,55 @@
 				  NULL, ata_std_postreset);
 }
 
+static int vt6421_prereset(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	u8 tmp;
+	
+	if (ap->port_no != PATA_PORT) {
+		ap->cbl = ATA_CBL_SATA;
+		return 0;
+	}
+	pci_read_config_byte(pdev, PATA_UDMA_TIMING, &tmp);
+	
+	if (tmp & 0x10)
+		ap->cbl = ATA_CBL_PATA40;
+	else
+		ap->cbl = ATA_CBL_PATA80;
+	return 0;
+}
+
+static void vt6421_error_handler(struct ata_port *ap)
+{
+	return ata_bmdma_drive_eh(ap, vt6421_prereset, ata_std_softreset,
+				  NULL, ata_std_postreset);
+}
+
+static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	static const u8 pio_bits[] = { 0xA8, 0x65, 0x65, 0x31, 0x20 };
+	if (ap->port_no == PATA_PORT)
+		pci_write_config_byte(pdev, PATA_PIO_TIMING, pio_bits[adev->pio_mode - XFER_PIO_0]);
+}
+
+static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	static const u8 udma_bits[] = { 0xEE, 0xE8, 0xE6, 0xE4, 0xE2, 0xE1, 0xE0, 0xE0 };
+	if (ap->port_no == PATA_PORT)
+		pci_write_config_byte(pdev, PATA_UDMA_TIMING, udma_bits[adev->pio_mode - XFER_UDMA_0]);
+}
+
+static unsigned long vt6421_mode_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long modes)
+{
+	if(ap->port_no == PATA_PORT) {
+		modes &= ~ATA_MASK_MWDMA;	/* No MWDMA support */
+		modes &= ~ (0x40 << ATA_SHIFT_UDMA);  /* UDMA 133 limited */
+	}
+	return modes;
+}
+
 static const unsigned int svia_bar_sizes[] = {
 	8, 4, 8, 4, 16, 256
 };
@@ -348,7 +408,7 @@
 
 	probe_ent->sht		= &svia_sht;
 	probe_ent->port_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY;
-	probe_ent->port_ops	= &vt6421_sata_ops;
+	probe_ent->port_ops	= &vt6421_ata_ops;
 	probe_ent->n_ports	= N_PORTS;
 	probe_ent->irq		= pdev->irq;
 	probe_ent->irq_flags	= IRQF_SHARED;
@@ -500,4 +560,3 @@
 
 module_init(svia_init);
 module_exit(svia_exit);
-
-
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