Initial import

1 files changed, 295 insertions, 0 deletions

diff --git a/drivers/ide/cs5530.c b/drivers/ide/cs5530.c
new file mode 100644
index 000000000..65371599b
--- /dev/null
+++ b/drivers/ide/cs5530.c
@@ -0,0 +1,295 @@
+/*
+ * Copyright (C) 2000			Andre Hedrick <andre@linux-ide.org>
+ * Copyright (C) 2000			Mark Lord <mlord@pobox.com>
+ * Copyright (C) 2007			Bartlomiej Zolnierkiewicz
+ *
+ * May be copied or modified under the terms of the GNU General Public License
+ *
+ * Development of this chipset driver was funded
+ * by the nice folks at National Semiconductor.
+ *
+ * Documentation:
+ *	CS5530 documentation available from National Semiconductor.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ide.h>
+
+#include <asm/io.h>
+
+#define DRV_NAME "cs5530"
+
+/*
+ * Here are the standard PIO mode 0-4 timings for each "format".
+ * Format-0 uses fast data reg timings, with slower command reg timings.
+ * Format-1 uses fast timings for all registers, but won't work with all drives.
+ */
+static unsigned int cs5530_pio_timings[2][5] = {
+	{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
+	{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
+};
+
+/*
+ * After chip reset, the PIO timings are set to 0x0000e132, which is not valid.
+ */
+#define CS5530_BAD_PIO(timings) (((timings)&~0x80000000)==0x0000e132)
+#define CS5530_BASEREG(hwif)	(((hwif)->dma_base & ~0xf) + ((hwif)->channel ? 0x30 : 0x20))
+
+/**
+ *	cs5530_set_pio_mode	-	set host controller for PIO mode
+ *	@hwif: port
+ *	@drive: drive
+ *
+ *	Handles setting of PIO mode for the chipset.
+ *
+ *	The init_hwif_cs5530() routine guarantees that all drives
+ *	will have valid default PIO timings set up before we get here.
+ */
+
+static void cs5530_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
+{
+	unsigned long basereg = CS5530_BASEREG(hwif);
+	unsigned int format = (inl(basereg + 4) >> 31) & 1;
+	const u8 pio = drive->pio_mode - XFER_PIO_0;
+
+	outl(cs5530_pio_timings[format][pio], basereg + ((drive->dn & 1)<<3));
+}
+
+/**
+ *	cs5530_udma_filter	-	UDMA filter
+ *	@drive: drive
+ *
+ *	cs5530_udma_filter() does UDMA mask filtering for the given drive
+ *	taking into the consideration capabilities of the mate device.
+ *
+ *	The CS5530 specifies that two drives sharing a cable cannot mix
+ *	UDMA/MDMA.  It has to be one or the other, for the pair, though
+ *	different timings can still be chosen for each drive.  We could
+ *	set the appropriate timing bits on the fly, but that might be
+ *	a bit confusing.  So, for now we statically handle this requirement
+ *	by looking at our mate drive to see what it is capable of, before
+ *	choosing a mode for our own drive.
+ *
+ *	Note: This relies on the fact we never fail from UDMA to MWDMA2
+ *	but instead drop to PIO.
+ */
+
+static u8 cs5530_udma_filter(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	ide_drive_t *mate = ide_get_pair_dev(drive);
+	u16 *mateid;
+	u8 mask = hwif->ultra_mask;
+
+	if (mate == NULL)
+		goto out;
+	mateid = mate->id;
+
+	if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) {
+		if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
+		    (mateid[ATA_ID_UDMA_MODES] & 7))
+			goto out;
+		if (mateid[ATA_ID_MWDMA_MODES] & 7)
+			mask = 0;
+	}
+out:
+	return mask;
+}
+
+static void cs5530_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
+{
+	unsigned long basereg;
+	unsigned int reg, timings = 0;
+
+	switch (drive->dma_mode) {
+		case XFER_UDMA_0:	timings = 0x00921250; break;
+		case XFER_UDMA_1:	timings = 0x00911140; break;
+		case XFER_UDMA_2:	timings = 0x00911030; break;
+		case XFER_MW_DMA_0:	timings = 0x00077771; break;
+		case XFER_MW_DMA_1:	timings = 0x00012121; break;
+		case XFER_MW_DMA_2:	timings = 0x00002020; break;
+	}
+	basereg = CS5530_BASEREG(hwif);
+	reg = inl(basereg + 4);			/* get drive0 config register */
+	timings |= reg & 0x80000000;		/* preserve PIO format bit */
+	if ((drive-> dn & 1) == 0) {		/* are we configuring drive0? */
+		outl(timings, basereg + 4);	/* write drive0 config register */
+	} else {
+		if (timings & 0x00100000)
+			reg |=  0x00100000;	/* enable UDMA timings for both drives */
+		else
+			reg &= ~0x00100000;	/* disable UDMA timings for both drives */
+		outl(reg, basereg + 4);		/* write drive0 config register */
+		outl(timings, basereg + 12);	/* write drive1 config register */
+	}
+}
+
+/**
+ *	init_chipset_5530	-	set up 5530 bridge
+ *	@dev: PCI device
+ *
+ *	Initialize the cs5530 bridge for reliable IDE DMA operation.
+ */
+
+static int init_chipset_cs5530(struct pci_dev *dev)
+{
+	struct pci_dev *master_0 = NULL, *cs5530_0 = NULL;
+
+	if (pci_resource_start(dev, 4) == 0)
+		return -EFAULT;
+
+	dev = NULL;
+	while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
+		switch (dev->device) {
+			case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
+				master_0 = pci_dev_get(dev);
+				break;
+			case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
+				cs5530_0 = pci_dev_get(dev);
+				break;
+		}
+	}
+	if (!master_0) {
+		printk(KERN_ERR DRV_NAME ": unable to locate PCI MASTER function\n");
+		goto out;
+	}
+	if (!cs5530_0) {
+		printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n");
+		goto out;
+	}
+
+	/*
+	 * Enable BusMaster and MemoryWriteAndInvalidate for the cs5530:
+	 * -->  OR 0x14 into 16-bit PCI COMMAND reg of function 0 of the cs5530
+	 */
+
+	pci_set_master(cs5530_0);
+	pci_try_set_mwi(cs5530_0);
+
+	/*
+	 * Set PCI CacheLineSize to 16-bytes:
+	 * --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
+	 */
+
+	pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);
+
+	/*
+	 * Disable trapping of UDMA register accesses (Win98 hack):
+	 * --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
+	 */
+
+	pci_write_config_word(cs5530_0, 0xd0, 0x5006);
+
+	/*
+	 * Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
+	 * The other settings are what is necessary to get the register
+	 * into a sane state for IDE DMA operation.
+	 */
+
+	pci_write_config_byte(master_0, 0x40, 0x1e);
+
+	/* 
+	 * Set max PCI burst size (16-bytes seems to work best):
+	 *	   16bytes: set bit-1 at 0x41 (reg value of 0x16)
+	 *	all others: clear bit-1 at 0x41, and do:
+	 *	  128bytes: OR 0x00 at 0x41
+	 *	  256bytes: OR 0x04 at 0x41
+	 *	  512bytes: OR 0x08 at 0x41
+	 *	 1024bytes: OR 0x0c at 0x41
+	 */
+
+	pci_write_config_byte(master_0, 0x41, 0x14);
+
+	/*
+	 * These settings are necessary to get the chip
+	 * into a sane state for IDE DMA operation.
+	 */
+
+	pci_write_config_byte(master_0, 0x42, 0x00);
+	pci_write_config_byte(master_0, 0x43, 0xc1);
+
+out:
+	pci_dev_put(master_0);
+	pci_dev_put(cs5530_0);
+	return 0;
+}
+
+/**
+ *	init_hwif_cs5530	-	initialise an IDE channel
+ *	@hwif: IDE to initialize
+ *
+ *	This gets invoked by the IDE driver once for each channel. It
+ *	performs channel-specific pre-initialization before drive probing.
+ */
+
+static void init_hwif_cs5530 (ide_hwif_t *hwif)
+{
+	unsigned long basereg;
+	u32 d0_timings;
+
+	basereg = CS5530_BASEREG(hwif);
+	d0_timings = inl(basereg + 0);
+	if (CS5530_BAD_PIO(d0_timings))
+		outl(cs5530_pio_timings[(d0_timings >> 31) & 1][0], basereg + 0);
+	if (CS5530_BAD_PIO(inl(basereg + 8)))
+		outl(cs5530_pio_timings[(d0_timings >> 31) & 1][0], basereg + 8);
+}
+
+static const struct ide_port_ops cs5530_port_ops = {
+	.set_pio_mode		= cs5530_set_pio_mode,
+	.set_dma_mode		= cs5530_set_dma_mode,
+	.udma_filter		= cs5530_udma_filter,
+};
+
+static const struct ide_port_info cs5530_chipset = {
+	.name		= DRV_NAME,
+	.init_chipset	= init_chipset_cs5530,
+	.init_hwif	= init_hwif_cs5530,
+	.port_ops	= &cs5530_port_ops,
+	.host_flags	= IDE_HFLAG_SERIALIZE |
+			  IDE_HFLAG_POST_SET_MODE,
+	.pio_mask	= ATA_PIO4,
+	.mwdma_mask	= ATA_MWDMA2,
+	.udma_mask	= ATA_UDMA2,
+};
+
+static int cs5530_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	return ide_pci_init_one(dev, &cs5530_chipset, NULL);
+}
+
+static const struct pci_device_id cs5530_pci_tbl[] = {
+	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), 0 },
+	{ 0, },
+};
+MODULE_DEVICE_TABLE(pci, cs5530_pci_tbl);
+
+static struct pci_driver cs5530_pci_driver = {
+	.name		= "CS5530 IDE",
+	.id_table	= cs5530_pci_tbl,
+	.probe		= cs5530_init_one,
+	.remove		= ide_pci_remove,
+	.suspend	= ide_pci_suspend,
+	.resume		= ide_pci_resume,
+};
+
+static int __init cs5530_ide_init(void)
+{
+	return ide_pci_register_driver(&cs5530_pci_driver);
+}
+
+static void __exit cs5530_ide_exit(void)
+{
+	pci_unregister_driver(&cs5530_pci_driver);
+}
+
+module_init(cs5530_ide_init);
+module_exit(cs5530_ide_exit);
+
+MODULE_AUTHOR("Mark Lord");
+MODULE_DESCRIPTION("PCI driver module for Cyrix/NS 5530 IDE");
+MODULE_LICENSE("GPL");