Initial import

1 files changed, 369 insertions, 0 deletions

diff --git a/drivers/ata/pata_cs5530.c b/drivers/ata/pata_cs5530.c
new file mode 100644
index 000000000..f9ca72e93
--- /dev/null
+++ b/drivers/ata/pata_cs5530.c
@@ -0,0 +1,369 @@
+/*
+ * pata-cs5530.c 	- CS5530 PATA for new ATA layer
+ *			  (C) 2005 Red Hat Inc
+ *
+ * based upon cs5530.c by Mark Lord.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Loosely based on the piix & svwks drivers.
+ *
+ * Documentation:
+ *	Available from AMD web site.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <linux/dmi.h>
+
+#define DRV_NAME	"pata_cs5530"
+#define DRV_VERSION	"0.7.4"
+
+static void __iomem *cs5530_port_base(struct ata_port *ap)
+{
+	unsigned long bmdma = (unsigned long)ap->ioaddr.bmdma_addr;
+
+	return (void __iomem *)((bmdma & ~0x0F) + 0x20 + 0x10 * ap->port_no);
+}
+
+/**
+ *	cs5530_set_piomode		-	PIO setup
+ *	@ap: ATA interface
+ *	@adev: device on the interface
+ *
+ *	Set our PIO requirements. This is fairly simple on the CS5530
+ *	chips.
+ */
+
+static void cs5530_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	static const unsigned int cs5530_pio_timings[2][5] = {
+		{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
+		{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
+	};
+	void __iomem *base = cs5530_port_base(ap);
+	u32 tuning;
+	int format;
+
+	/* Find out which table to use */
+	tuning = ioread32(base + 0x04);
+	format = (tuning & 0x80000000UL) ? 1 : 0;
+
+	/* Now load the right timing register */
+	if (adev->devno)
+		base += 0x08;
+
+	iowrite32(cs5530_pio_timings[format][adev->pio_mode - XFER_PIO_0], base);
+}
+
+/**
+ *	cs5530_set_dmamode		-	DMA timing setup
+ *	@ap: ATA interface
+ *	@adev: Device being configured
+ *
+ *	We cannot mix MWDMA and UDMA without reloading timings each switch
+ *	master to slave. We track the last DMA setup in order to minimise
+ *	reloads.
+ */
+
+static void cs5530_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+	void __iomem *base = cs5530_port_base(ap);
+	u32 tuning, timing = 0;
+	u8 reg;
+
+	/* Find out which table to use */
+	tuning = ioread32(base + 0x04);
+
+	switch(adev->dma_mode) {
+		case XFER_UDMA_0:
+			timing  = 0x00921250;break;
+		case XFER_UDMA_1:
+			timing  = 0x00911140;break;
+		case XFER_UDMA_2:
+			timing  = 0x00911030;break;
+		case XFER_MW_DMA_0:
+			timing  = 0x00077771;break;
+		case XFER_MW_DMA_1:
+			timing  = 0x00012121;break;
+		case XFER_MW_DMA_2:
+			timing  = 0x00002020;break;
+		default:
+			BUG();
+	}
+	/* Merge in the PIO format bit */
+	timing |= (tuning & 0x80000000UL);
+	if (adev->devno == 0) /* Master */
+		iowrite32(timing, base + 0x04);
+	else {
+		if (timing & 0x00100000)
+			tuning |= 0x00100000;	/* UDMA for both */
+		else
+			tuning &= ~0x00100000;	/* MWDMA for both */
+		iowrite32(tuning, base + 0x04);
+		iowrite32(timing, base + 0x0C);
+	}
+
+	/* Set the DMA capable bit in the BMDMA area */
+	reg = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+	reg |= (1 << (5 + adev->devno));
+	iowrite8(reg, ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+
+	/* Remember the last DMA setup we did */
+
+	ap->private_data = adev;
+}
+
+/**
+ *	cs5530_qc_issue		-	command issue
+ *	@qc: command pending
+ *
+ *	Called when the libata layer is about to issue a command. We wrap
+ *	this interface so that we can load the correct ATA timings if
+ *	necessary.  Specifically we have a problem that there is only
+ *	one MWDMA/UDMA bit.
+ */
+
+static unsigned int cs5530_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_device *adev = qc->dev;
+	struct ata_device *prev = ap->private_data;
+
+	/* See if the DMA settings could be wrong */
+	if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
+		/* Maybe, but do the channels match MWDMA/UDMA ? */
+		if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
+		    (ata_using_udma(prev) && !ata_using_udma(adev)))
+		    	/* Switch the mode bits */
+		    	cs5530_set_dmamode(ap, adev);
+	}
+
+	return ata_bmdma_qc_issue(qc);
+}
+
+static struct scsi_host_template cs5530_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+	.sg_tablesize	= LIBATA_DUMB_MAX_PRD,
+};
+
+static struct ata_port_operations cs5530_port_ops = {
+	.inherits	= &ata_bmdma_port_ops,
+
+	.qc_prep 	= ata_bmdma_dumb_qc_prep,
+	.qc_issue	= cs5530_qc_issue,
+
+	.cable_detect	= ata_cable_40wire,
+	.set_piomode	= cs5530_set_piomode,
+	.set_dmamode	= cs5530_set_dmamode,
+};
+
+static const struct dmi_system_id palmax_dmi_table[] = {
+	{
+		.ident = "Palmax PD1100",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Cyrix"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Caddis"),
+		},
+	},
+	{ }
+};
+
+static int cs5530_is_palmax(void)
+{
+	if (dmi_check_system(palmax_dmi_table)) {
+		printk(KERN_INFO "Palmax PD1100: Disabling DMA on docking port.\n");
+		return 1;
+	}
+	return 0;
+}
+
+
+/**
+ *	cs5530_init_chip	-	Chipset init
+ *
+ *	Perform the chip initialisation work that is shared between both
+ *	setup and resume paths
+ */
+
+static int cs5530_init_chip(void)
+{
+	struct pci_dev *master_0 = NULL, *cs5530_0 = NULL, *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 fail_put;
+	}
+	if (!cs5530_0) {
+		printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n");
+		goto fail_put;
+	}
+
+	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
+	 *
+	 * Note: This value is constant because the 5530 is only a Geode companion
+	 */
+
+	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);
+
+	pci_dev_put(master_0);
+	pci_dev_put(cs5530_0);
+	return 0;
+fail_put:
+	pci_dev_put(master_0);
+	pci_dev_put(cs5530_0);
+	return -ENODEV;
+}
+
+/**
+ *	cs5530_init_one		-	Initialise a CS5530
+ *	@dev: PCI device
+ *	@id: Entry in match table
+ *
+ *	Install a driver for the newly found CS5530 companion chip. Most of
+ *	this is just housekeeping. We have to set the chip up correctly and
+ *	turn off various bits of emulation magic.
+ */
+
+static int cs5530_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	static const struct ata_port_info info = {
+		.flags = ATA_FLAG_SLAVE_POSS,
+		.pio_mask = ATA_PIO4,
+		.mwdma_mask = ATA_MWDMA2,
+		.udma_mask = ATA_UDMA2,
+		.port_ops = &cs5530_port_ops
+	};
+	/* The docking connector doesn't do UDMA, and it seems not MWDMA */
+	static const struct ata_port_info info_palmax_secondary = {
+		.flags = ATA_FLAG_SLAVE_POSS,
+		.pio_mask = ATA_PIO4,
+		.port_ops = &cs5530_port_ops
+	};
+	const struct ata_port_info *ppi[] = { &info, NULL };
+	int rc;
+
+	rc = pcim_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	/* Chip initialisation */
+	if (cs5530_init_chip())
+		return -ENODEV;
+
+	if (cs5530_is_palmax())
+		ppi[1] = &info_palmax_secondary;
+
+	/* Now kick off ATA set up */
+	return ata_pci_bmdma_init_one(pdev, ppi, &cs5530_sht, NULL, 0);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cs5530_reinit_one(struct pci_dev *pdev)
+{
+	struct ata_host *host = pci_get_drvdata(pdev);
+	int rc;
+
+	rc = ata_pci_device_do_resume(pdev);
+	if (rc)
+		return rc;
+
+	/* If we fail on resume we are doomed */
+	if (cs5530_init_chip())
+		return -EIO;
+
+	ata_host_resume(host);
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct pci_device_id cs5530[] = {
+	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), },
+
+	{ },
+};
+
+static struct pci_driver cs5530_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= cs5530,
+	.probe 		= cs5530_init_one,
+	.remove		= ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= ata_pci_device_suspend,
+	.resume		= cs5530_reinit_one,
+#endif
+};
+
+module_pci_driver(cs5530_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for the Cyrix/NS/AMD 5530");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, cs5530);
+MODULE_VERSION(DRV_VERSION);