Initial import

1 files changed, 365 insertions, 0 deletions

diff --git a/drivers/ide/sl82c105.c b/drivers/ide/sl82c105.c
new file mode 100644
index 000000000..8755df333
--- /dev/null
+++ b/drivers/ide/sl82c105.c
@@ -0,0 +1,365 @@
+/*
+ * SL82C105/Winbond 553 IDE driver
+ *
+ * Maintainer unknown.
+ *
+ * Drive tuning added from Rebel.com's kernel sources
+ *  -- Russell King (15/11/98) linux@arm.linux.org.uk
+ * 
+ * Merge in Russell's HW workarounds, fix various problems
+ * with the timing registers setup.
+ *  -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org
+ *
+ * Copyright (C) 2006-2007,2009 MontaVista Software, Inc. <source@mvista.com>
+ * Copyright (C)      2007 Bartlomiej Zolnierkiewicz
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+
+#include <asm/io.h>
+
+#define DRV_NAME "sl82c105"
+
+/*
+ * SL82C105 PCI config register 0x40 bits.
+ */
+#define CTRL_IDE_IRQB   (1 << 30)
+#define CTRL_IDE_IRQA   (1 << 28)
+#define CTRL_LEGIRQ     (1 << 11)
+#define CTRL_P1F16      (1 << 5)
+#define CTRL_P1EN       (1 << 4)
+#define CTRL_P0F16      (1 << 1)
+#define CTRL_P0EN       (1 << 0)
+
+/*
+ * Convert a PIO mode and cycle time to the required on/off times
+ * for the interface.  This has protection against runaway timings.
+ */
+static unsigned int get_pio_timings(ide_drive_t *drive, u8 pio)
+{
+	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
+	unsigned int cmd_on, cmd_off;
+	u8 iordy = 0;
+
+	cmd_on  = (t->active + 29) / 30;
+	cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;
+
+	if (cmd_on == 0)
+		cmd_on = 1;
+
+	if (cmd_off == 0)
+		cmd_off = 1;
+
+	if (ide_pio_need_iordy(drive, pio))
+		iordy = 0x40;
+
+	return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
+}
+
+/*
+ * Configure the chipset for PIO mode.
+ */
+static void sl82c105_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
+{
+	struct pci_dev *dev	= to_pci_dev(hwif->dev);
+	unsigned long timings	= (unsigned long)ide_get_drivedata(drive);
+	int reg			= 0x44 + drive->dn * 4;
+	u16 drv_ctrl;
+	const u8 pio		= drive->pio_mode - XFER_PIO_0;
+
+	drv_ctrl = get_pio_timings(drive, pio);
+
+	/*
+	 * Store the PIO timings so that we can restore them
+	 * in case DMA will be turned off...
+	 */
+	timings &= 0xffff0000;
+	timings |= drv_ctrl;
+	ide_set_drivedata(drive, (void *)timings);
+
+	pci_write_config_word(dev, reg,  drv_ctrl);
+	pci_read_config_word (dev, reg, &drv_ctrl);
+
+	printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
+			  ide_xfer_verbose(pio + XFER_PIO_0),
+			  ide_pio_cycle_time(drive, pio), drv_ctrl);
+}
+
+/*
+ * Configure the chipset for DMA mode.
+ */
+static void sl82c105_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
+{
+	static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
+	unsigned long timings = (unsigned long)ide_get_drivedata(drive);
+	u16 drv_ctrl;
+	const u8 speed = drive->dma_mode;
+
+	drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
+
+	/*
+	 * Store the DMA timings so that we can actually program
+	 * them when DMA will be turned on...
+	 */
+	timings &= 0x0000ffff;
+	timings |= (unsigned long)drv_ctrl << 16;
+	ide_set_drivedata(drive, (void *)timings);
+}
+
+static int sl82c105_test_irq(ide_hwif_t *hwif)
+{
+	struct pci_dev *dev	= to_pci_dev(hwif->dev);
+	u32 val, mask		= hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
+
+	pci_read_config_dword(dev, 0x40, &val);
+
+	return (val & mask) ? 1 : 0;
+}
+
+/*
+ * The SL82C105 holds off all IDE interrupts while in DMA mode until
+ * all DMA activity is completed.  Sometimes this causes problems (eg,
+ * when the drive wants to report an error condition).
+ *
+ * 0x7e is a "chip testing" register.  Bit 2 resets the DMA controller
+ * state machine.  We need to kick this to work around various bugs.
+ */
+static inline void sl82c105_reset_host(struct pci_dev *dev)
+{
+	u16 val;
+
+	pci_read_config_word(dev, 0x7e, &val);
+	pci_write_config_word(dev, 0x7e, val | (1 << 2));
+	pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
+}
+
+/*
+ * If we get an IRQ timeout, it might be that the DMA state machine
+ * got confused.  Fix from Todd Inglett.  Details from Winbond.
+ *
+ * This function is called when the IDE timer expires, the drive
+ * indicates that it is READY, and we were waiting for DMA to complete.
+ */
+static void sl82c105_dma_lost_irq(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif	= drive->hwif;
+	struct pci_dev *dev	= to_pci_dev(hwif->dev);
+	u32 val, mask		= hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
+	u8 dma_cmd;
+
+	printk(KERN_WARNING "sl82c105: lost IRQ, resetting host\n");
+
+	/*
+	 * Check the raw interrupt from the drive.
+	 */
+	pci_read_config_dword(dev, 0x40, &val);
+	if (val & mask)
+		printk(KERN_INFO "sl82c105: drive was requesting IRQ, "
+		       "but host lost it\n");
+
+	/*
+	 * Was DMA enabled?  If so, disable it - we're resetting the
+	 * host.  The IDE layer will be handling the drive for us.
+	 */
+	dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
+	if (dma_cmd & 1) {
+		outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
+		printk(KERN_INFO "sl82c105: DMA was enabled\n");
+	}
+
+	sl82c105_reset_host(dev);
+}
+
+/*
+ * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
+ * Winbond recommend that the DMA state machine is reset prior to
+ * setting the bus master DMA enable bit.
+ *
+ * The generic IDE core will have disabled the BMEN bit before this
+ * function is called.
+ */
+static void sl82c105_dma_start(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif	= drive->hwif;
+	struct pci_dev *dev	= to_pci_dev(hwif->dev);
+	int reg 		= 0x44 + drive->dn * 4;
+
+	pci_write_config_word(dev, reg,
+			      (unsigned long)ide_get_drivedata(drive) >> 16);
+
+	sl82c105_reset_host(dev);
+	ide_dma_start(drive);
+}
+
+static void sl82c105_dma_clear(ide_drive_t *drive)
+{
+	struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
+
+	sl82c105_reset_host(dev);
+}
+
+static int sl82c105_dma_end(ide_drive_t *drive)
+{
+	struct pci_dev *dev	= to_pci_dev(drive->hwif->dev);
+	int reg 		= 0x44 + drive->dn * 4;
+	int ret			= ide_dma_end(drive);
+
+	pci_write_config_word(dev, reg,
+			      (unsigned long)ide_get_drivedata(drive));
+
+	return ret;
+}
+
+/*
+ * ATA reset will clear the 16 bits mode in the control
+ * register, we need to reprogram it
+ */
+static void sl82c105_resetproc(ide_drive_t *drive)
+{
+	struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
+	u32 val;
+
+	pci_read_config_dword(dev, 0x40, &val);
+	val |= (CTRL_P1F16 | CTRL_P0F16);
+	pci_write_config_dword(dev, 0x40, val);
+}
+
+/*
+ * Return the revision of the Winbond bridge
+ * which this function is part of.
+ */
+static u8 sl82c105_bridge_revision(struct pci_dev *dev)
+{
+	struct pci_dev *bridge;
+
+	/*
+	 * The bridge should be part of the same device, but function 0.
+	 */
+	bridge = pci_get_bus_and_slot(dev->bus->number,
+			       PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+	if (!bridge)
+		return -1;
+
+	/*
+	 * Make sure it is a Winbond 553 and is an ISA bridge.
+	 */
+	if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
+	    bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
+	    bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
+	    	pci_dev_put(bridge);
+		return -1;
+	}
+	/*
+	 * We need to find function 0's revision, not function 1
+	 */
+	pci_dev_put(bridge);
+
+	return bridge->revision;
+}
+
+/*
+ * Enable the PCI device
+ * 
+ * --BenH: It's arch fixup code that should enable channels that
+ * have not been enabled by firmware. I decided we can still enable
+ * channel 0 here at least, but channel 1 has to be enabled by
+ * firmware or arch code. We still set both to 16 bits mode.
+ */
+static int init_chipset_sl82c105(struct pci_dev *dev)
+{
+	u32 val;
+
+	pci_read_config_dword(dev, 0x40, &val);
+	val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
+	pci_write_config_dword(dev, 0x40, val);
+
+	return 0;
+}
+
+static const struct ide_port_ops sl82c105_port_ops = {
+	.set_pio_mode		= sl82c105_set_pio_mode,
+	.set_dma_mode		= sl82c105_set_dma_mode,
+	.resetproc		= sl82c105_resetproc,
+	.test_irq		= sl82c105_test_irq,
+};
+
+static const struct ide_dma_ops sl82c105_dma_ops = {
+	.dma_host_set		= ide_dma_host_set,
+	.dma_setup		= ide_dma_setup,
+	.dma_start		= sl82c105_dma_start,
+	.dma_end		= sl82c105_dma_end,
+	.dma_test_irq		= ide_dma_test_irq,
+	.dma_lost_irq		= sl82c105_dma_lost_irq,
+	.dma_timer_expiry	= ide_dma_sff_timer_expiry,
+	.dma_clear		= sl82c105_dma_clear,
+	.dma_sff_read_status	= ide_dma_sff_read_status,
+};
+
+static const struct ide_port_info sl82c105_chipset = {
+	.name		= DRV_NAME,
+	.init_chipset	= init_chipset_sl82c105,
+	.enablebits	= {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
+	.port_ops	= &sl82c105_port_ops,
+	.dma_ops	= &sl82c105_dma_ops,
+	.host_flags	= IDE_HFLAG_IO_32BIT |
+			  IDE_HFLAG_UNMASK_IRQS |
+			  IDE_HFLAG_SERIALIZE_DMA |
+			  IDE_HFLAG_NO_AUTODMA,
+	.pio_mask	= ATA_PIO5,
+	.mwdma_mask	= ATA_MWDMA2,
+};
+
+static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	struct ide_port_info d = sl82c105_chipset;
+	u8 rev = sl82c105_bridge_revision(dev);
+
+	if (rev <= 5) {
+		/*
+		 * Never ever EVER under any circumstances enable
+		 * DMA when the bridge is this old.
+		 */
+		printk(KERN_INFO DRV_NAME ": Winbond W83C553 bridge "
+				 "revision %d, BM-DMA disabled\n", rev);
+		d.dma_ops = NULL;
+		d.mwdma_mask = 0;
+		d.host_flags &= ~IDE_HFLAG_SERIALIZE_DMA;
+	}
+
+	return ide_pci_init_one(dev, &d, NULL);
+}
+
+static const struct pci_device_id sl82c105_pci_tbl[] = {
+	{ PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0 },
+	{ 0, },
+};
+MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
+
+static struct pci_driver sl82c105_pci_driver = {
+	.name		= "W82C105_IDE",
+	.id_table	= sl82c105_pci_tbl,
+	.probe		= sl82c105_init_one,
+	.remove		= ide_pci_remove,
+	.suspend	= ide_pci_suspend,
+	.resume		= ide_pci_resume,
+};
+
+static int __init sl82c105_ide_init(void)
+{
+	return ide_pci_register_driver(&sl82c105_pci_driver);
+}
+
+static void __exit sl82c105_ide_exit(void)
+{
+	pci_unregister_driver(&sl82c105_pci_driver);
+}
+
+module_init(sl82c105_ide_init);
+module_exit(sl82c105_ide_exit);
+
+MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
+MODULE_LICENSE("GPL");