Initial import

1 files changed, 444 insertions, 0 deletions

diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
new file mode 100644
index 000000000..c14071be4
--- /dev/null
+++ b/drivers/ata/pata_sil680.c
@@ -0,0 +1,444 @@
+/*
+ * pata_sil680.c 	- SIL680 PATA for new ATA layer
+ *			  (C) 2005 Red Hat Inc
+ *
+ * based upon
+ *
+ * linux/drivers/ide/pci/siimage.c		Version 1.07	Nov 30, 2003
+ *
+ * Copyright (C) 2001-2002	Andre Hedrick <andre@linux-ide.org>
+ * Copyright (C) 2003		Red Hat <alan@redhat.com>
+ *
+ *  May be copied or modified under the terms of the GNU General Public License
+ *
+ *  Documentation publicly available.
+ *
+ *	If you have strange problems with nVidia chipset systems please
+ *	see the SI support documentation and update your system BIOS
+ *	if necessary
+ *
+ * TODO
+ *	If we know all our devices are LBA28 (or LBA28 sized)  we could use
+ *	the command fifo mode.
+ */
+
+#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>
+
+#define DRV_NAME "pata_sil680"
+#define DRV_VERSION "0.4.9"
+
+#define SIL680_MMIO_BAR		5
+
+/**
+ *	sil680_selreg		-	return register base
+ *	@ap: ATA interface
+ *	@r: config offset
+ *
+ *	Turn a config register offset into the right address in PCI space
+ *	to access the control register in question.
+ *
+ *	Thankfully this is a configuration operation so isn't performance
+ *	criticial.
+ */
+
+static unsigned long sil680_selreg(struct ata_port *ap, int r)
+{
+	unsigned long base = 0xA0 + r;
+	base += (ap->port_no << 4);
+	return base;
+}
+
+/**
+ *	sil680_seldev		-	return register base
+ *	@ap: ATA interface
+ *	@r: config offset
+ *
+ *	Turn a config register offset into the right address in PCI space
+ *	to access the control register in question including accounting for
+ *	the unit shift.
+ */
+
+static unsigned long sil680_seldev(struct ata_port *ap, struct ata_device *adev, int r)
+{
+	unsigned long base = 0xA0 + r;
+	base += (ap->port_no << 4);
+	base |= adev->devno ? 2 : 0;
+	return base;
+}
+
+
+/**
+ *	sil680_cable_detect	-	cable detection
+ *	@ap: ATA port
+ *
+ *	Perform cable detection. The SIL680 stores this in PCI config
+ *	space for us.
+ */
+
+static int sil680_cable_detect(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	unsigned long addr = sil680_selreg(ap, 0);
+	u8 ata66;
+	pci_read_config_byte(pdev, addr, &ata66);
+	if (ata66 & 1)
+		return ATA_CBL_PATA80;
+	else
+		return ATA_CBL_PATA40;
+}
+
+/**
+ *	sil680_set_piomode	-	set PIO mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Program the SIL680 registers for PIO mode. Note that the task speed
+ *	registers are shared between the devices so we must pick the lowest
+ *	mode for command work.
+ */
+
+static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	static const u16 speed_p[5] = {
+		0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1
+	};
+	static const u16 speed_t[5] = {
+		0x328A, 0x2283, 0x1281, 0x10C3, 0x10C1
+	};
+
+	unsigned long tfaddr = sil680_selreg(ap, 0x02);
+	unsigned long addr = sil680_seldev(ap, adev, 0x04);
+	unsigned long addr_mask = 0x80 + 4 * ap->port_no;
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	int pio = adev->pio_mode - XFER_PIO_0;
+	int lowest_pio = pio;
+	int port_shift = 4 * adev->devno;
+	u16 reg;
+	u8 mode;
+
+	struct ata_device *pair = ata_dev_pair(adev);
+
+	if (pair != NULL && adev->pio_mode > pair->pio_mode)
+		lowest_pio = pair->pio_mode - XFER_PIO_0;
+
+	pci_write_config_word(pdev, addr, speed_p[pio]);
+	pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);
+
+	pci_read_config_word(pdev, tfaddr-2, &reg);
+	pci_read_config_byte(pdev, addr_mask, &mode);
+
+	reg &= ~0x0200;			/* Clear IORDY */
+	mode &= ~(3 << port_shift);	/* Clear IORDY and DMA bits */
+
+	if (ata_pio_need_iordy(adev)) {
+		reg |= 0x0200;		/* Enable IORDY */
+		mode |= 1 << port_shift;
+	}
+	pci_write_config_word(pdev, tfaddr-2, reg);
+	pci_write_config_byte(pdev, addr_mask, mode);
+}
+
+/**
+ *	sil680_set_dmamode	-	set DMA mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Program the MWDMA/UDMA modes for the sil680 chipset.
+ *
+ *	The MWDMA mode values are pulled from a lookup table
+ *	while the chipset uses mode number for UDMA.
+ */
+
+static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+	static const u8 ultra_table[2][7] = {
+		{ 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF },	/* 100MHz */
+		{ 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 },	/* 133Mhz */
+	};
+	static const u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };
+
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	unsigned long ma = sil680_seldev(ap, adev, 0x08);
+	unsigned long ua = sil680_seldev(ap, adev, 0x0C);
+	unsigned long addr_mask = 0x80 + 4 * ap->port_no;
+	int port_shift = adev->devno * 4;
+	u8 scsc, mode;
+	u16 multi, ultra;
+
+	pci_read_config_byte(pdev, 0x8A, &scsc);
+	pci_read_config_byte(pdev, addr_mask, &mode);
+	pci_read_config_word(pdev, ma, &multi);
+	pci_read_config_word(pdev, ua, &ultra);
+
+	/* Mask timing bits */
+	ultra &= ~0x3F;
+	mode &= ~(0x03 << port_shift);
+
+	/* Extract scsc */
+	scsc = (scsc & 0x30) ? 1 : 0;
+
+	if (adev->dma_mode >= XFER_UDMA_0) {
+		multi = 0x10C1;
+		ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
+		mode |= (0x03 << port_shift);
+	} else {
+		multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
+		mode |= (0x02 << port_shift);
+	}
+	pci_write_config_byte(pdev, addr_mask, mode);
+	pci_write_config_word(pdev, ma, multi);
+	pci_write_config_word(pdev, ua, ultra);
+}
+
+/**
+ *	sil680_sff_exec_command - issue ATA command to host controller
+ *	@ap: port to which command is being issued
+ *	@tf: ATA taskfile register set
+ *
+ *	Issues ATA command, with proper synchronization with interrupt
+ *	handler / other threads. Use our MMIO space for PCI posting to avoid
+ *	a hideously slow cycle all the way to the device.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static void sil680_sff_exec_command(struct ata_port *ap,
+				    const struct ata_taskfile *tf)
+{
+	DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
+	iowrite8(tf->command, ap->ioaddr.command_addr);
+	ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+}
+
+static bool sil680_sff_irq_check(struct ata_port *ap)
+{
+	struct pci_dev *pdev	= to_pci_dev(ap->host->dev);
+	unsigned long addr	= sil680_selreg(ap, 1);
+	u8 val;
+
+	pci_read_config_byte(pdev, addr, &val);
+
+	return val & 0x08;
+}
+
+static struct scsi_host_template sil680_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+};
+
+
+static struct ata_port_operations sil680_port_ops = {
+	.inherits		= &ata_bmdma32_port_ops,
+	.sff_exec_command	= sil680_sff_exec_command,
+	.sff_irq_check		= sil680_sff_irq_check,
+	.cable_detect		= sil680_cable_detect,
+	.set_piomode		= sil680_set_piomode,
+	.set_dmamode		= sil680_set_dmamode,
+};
+
+/**
+ *	sil680_init_chip		-	chip setup
+ *	@pdev: PCI device
+ *
+ *	Perform all the chip setup which must be done both when the device
+ *	is powered up on boot and when we resume in case we resumed from RAM.
+ *	Returns the final clock settings.
+ */
+
+static u8 sil680_init_chip(struct pci_dev *pdev, int *try_mmio)
+{
+	u8 tmpbyte	= 0;
+
+	/* FIXME: double check */
+	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
+			      pdev->revision ? 1 : 255);
+
+	pci_write_config_byte(pdev, 0x80, 0x00);
+	pci_write_config_byte(pdev, 0x84, 0x00);
+
+	pci_read_config_byte(pdev, 0x8A, &tmpbyte);
+
+	dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
+		tmpbyte & 1, tmpbyte & 0x30);
+
+	*try_mmio = 0;
+#ifdef CONFIG_PPC
+	if (machine_is(cell))
+		*try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);
+#endif
+
+	switch (tmpbyte & 0x30) {
+	case 0x00:
+		/* 133 clock attempt to force it on */
+		pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
+		break;
+	case 0x30:
+		/* if clocking is disabled */
+		/* 133 clock attempt to force it on */
+		pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
+		break;
+	case 0x10:
+		/* 133 already */
+		break;
+	case 0x20:
+		/* BIOS set PCI x2 clocking */
+		break;
+	}
+
+	pci_read_config_byte(pdev,   0x8A, &tmpbyte);
+	dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
+		tmpbyte & 1, tmpbyte & 0x30);
+
+	pci_write_config_byte(pdev,  0xA1, 0x72);
+	pci_write_config_word(pdev,  0xA2, 0x328A);
+	pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
+	pci_write_config_dword(pdev, 0xA8, 0x43924392);
+	pci_write_config_dword(pdev, 0xAC, 0x40094009);
+	pci_write_config_byte(pdev,  0xB1, 0x72);
+	pci_write_config_word(pdev,  0xB2, 0x328A);
+	pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
+	pci_write_config_dword(pdev, 0xB8, 0x43924392);
+	pci_write_config_dword(pdev, 0xBC, 0x40094009);
+
+	switch (tmpbyte & 0x30) {
+	case 0x00:
+		printk(KERN_INFO "sil680: 100MHz clock.\n");
+		break;
+	case 0x10:
+		printk(KERN_INFO "sil680: 133MHz clock.\n");
+		break;
+	case 0x20:
+		printk(KERN_INFO "sil680: Using PCI clock.\n");
+		break;
+	/* This last case is _NOT_ ok */
+	case 0x30:
+		printk(KERN_ERR "sil680: Clock disabled ?\n");
+	}
+	return tmpbyte & 0x30;
+}
+
+static int sil680_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_UDMA6,
+		.port_ops = &sil680_port_ops
+	};
+	static const struct ata_port_info info_slow = {
+		.flags = ATA_FLAG_SLAVE_POSS,
+		.pio_mask = ATA_PIO4,
+		.mwdma_mask = ATA_MWDMA2,
+		.udma_mask = ATA_UDMA5,
+		.port_ops = &sil680_port_ops
+	};
+	const struct ata_port_info *ppi[] = { &info, NULL };
+	struct ata_host *host;
+	void __iomem *mmio_base;
+	int rc, try_mmio;
+
+	ata_print_version_once(&pdev->dev, DRV_VERSION);
+
+	rc = pcim_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	switch (sil680_init_chip(pdev, &try_mmio)) {
+		case 0:
+			ppi[0] = &info_slow;
+			break;
+		case 0x30:
+			return -ENODEV;
+	}
+
+	if (!try_mmio)
+		goto use_ioports;
+
+	/* Try to acquire MMIO resources and fallback to PIO if
+	 * that fails
+	 */
+	rc = pcim_iomap_regions(pdev, 1 << SIL680_MMIO_BAR, DRV_NAME);
+	if (rc)
+		goto use_ioports;
+
+	/* Allocate host and set it up */
+	host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
+	if (!host)
+		return -ENOMEM;
+	host->iomap = pcim_iomap_table(pdev);
+
+	/* Setup DMA masks */
+	rc = dma_set_mask(&pdev->dev, ATA_DMA_MASK);
+	if (rc)
+		return rc;
+	rc = dma_set_coherent_mask(&pdev->dev, ATA_DMA_MASK);
+	if (rc)
+		return rc;
+	pci_set_master(pdev);
+
+	/* Get MMIO base and initialize port addresses */
+	mmio_base = host->iomap[SIL680_MMIO_BAR];
+	host->ports[0]->ioaddr.bmdma_addr = mmio_base + 0x00;
+	host->ports[0]->ioaddr.cmd_addr = mmio_base + 0x80;
+	host->ports[0]->ioaddr.ctl_addr = mmio_base + 0x8a;
+	host->ports[0]->ioaddr.altstatus_addr = mmio_base + 0x8a;
+	ata_sff_std_ports(&host->ports[0]->ioaddr);
+	host->ports[1]->ioaddr.bmdma_addr = mmio_base + 0x08;
+	host->ports[1]->ioaddr.cmd_addr = mmio_base + 0xc0;
+	host->ports[1]->ioaddr.ctl_addr = mmio_base + 0xca;
+	host->ports[1]->ioaddr.altstatus_addr = mmio_base + 0xca;
+	ata_sff_std_ports(&host->ports[1]->ioaddr);
+
+	/* Register & activate */
+	return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
+				 IRQF_SHARED, &sil680_sht);
+
+use_ioports:
+	return ata_pci_bmdma_init_one(pdev, ppi, &sil680_sht, NULL, 0);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int sil680_reinit_one(struct pci_dev *pdev)
+{
+	struct ata_host *host = pci_get_drvdata(pdev);
+	int try_mmio, rc;
+
+	rc = ata_pci_device_do_resume(pdev);
+	if (rc)
+		return rc;
+	sil680_init_chip(pdev, &try_mmio);
+	ata_host_resume(host);
+	return 0;
+}
+#endif
+
+static const struct pci_device_id sil680[] = {
+	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
+
+	{ },
+};
+
+static struct pci_driver sil680_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= sil680,
+	.probe 		= sil680_init_one,
+	.remove		= ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= ata_pci_device_suspend,
+	.resume		= sil680_reinit_one,
+#endif
+};
+
+module_pci_driver(sil680_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for SI680 PATA");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, sil680);
+MODULE_VERSION(DRV_VERSION);