Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 282 insertions, 0 deletions

diff --git a/drivers/ata/pata_winbond.c b/drivers/ata/pata_winbond.c
new file mode 100644
index 0000000..319e164
--- /dev/null
+++ b/drivers/ata/pata_winbond.c
@@ -0,0 +1,282 @@
+/*
+ *    pata_winbond.c - Winbond VLB ATA controllers
+ *	(C) 2006 Red Hat
+ *
+ *    Support for the Winbond 83759A when operating in advanced mode.
+ *    Multichip mode is not currently supported.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <linux/platform_device.h>
+
+#define DRV_NAME "pata_winbond"
+#define DRV_VERSION "0.0.3"
+
+#define NR_HOST 4	/* Two winbond controllers, two channels each */
+
+struct winbond_data {
+	unsigned long config;
+	struct platform_device *platform_dev;
+};
+
+static struct ata_host *winbond_host[NR_HOST];
+static struct winbond_data winbond_data[NR_HOST];
+static int nr_winbond_host;
+
+#ifdef MODULE
+static int probe_winbond = 1;
+#else
+static int probe_winbond;
+#endif
+
+static DEFINE_SPINLOCK(winbond_lock);
+
+static void winbond_writecfg(unsigned long port, u8 reg, u8 val)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&winbond_lock, flags);
+	outb(reg, port + 0x01);
+	outb(val, port + 0x02);
+	spin_unlock_irqrestore(&winbond_lock, flags);
+}
+
+static u8 winbond_readcfg(unsigned long port, u8 reg)
+{
+	u8 val;
+
+	unsigned long flags;
+	spin_lock_irqsave(&winbond_lock, flags);
+	outb(reg, port + 0x01);
+	val = inb(port + 0x02);
+	spin_unlock_irqrestore(&winbond_lock, flags);
+
+	return val;
+}
+
+static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct ata_timing t;
+	struct winbond_data *winbond = ap->host->private_data;
+	int active, recovery;
+	u8 reg;
+	int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2);
+
+	reg = winbond_readcfg(winbond->config, 0x81);
+
+	/* Get the timing data in cycles */
+	if (reg & 0x40)		/* Fast VLB bus, assume 50MHz */
+		ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);
+	else
+		ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
+
+	active = (clamp_val(t.active, 3, 17) - 1) & 0x0F;
+	recovery = (clamp_val(t.recover, 1, 15) + 1) & 0x0F;
+	timing = (active << 4) | recovery;
+	winbond_writecfg(winbond->config, timing, reg);
+
+	/* Load the setup timing */
+
+	reg = 0x35;
+	if (adev->class != ATA_DEV_ATA)
+		reg |= 0x08;	/* FIFO off */
+	if (!ata_pio_need_iordy(adev))
+		reg |= 0x02;	/* IORDY off */
+	reg |= (clamp_val(t.setup, 0, 3) << 6);
+	winbond_writecfg(winbond->config, timing + 1, reg);
+}
+
+
+static unsigned int winbond_data_xfer(struct ata_device *dev,
+			unsigned char *buf, unsigned int buflen, int rw)
+{
+	struct ata_port *ap = dev->link->ap;
+	int slop = buflen & 3;
+
+	if (ata_id_has_dword_io(dev->id)) {
+		if (rw == READ)
+			ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
+		else
+			iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
+
+		if (unlikely(slop)) {
+			__le32 pad;
+			if (rw == READ) {
+				pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
+				memcpy(buf + buflen - slop, &pad, slop);
+			} else {
+				memcpy(&pad, buf + buflen - slop, slop);
+				iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
+			}
+			buflen += 4 - slop;
+		}
+	} else
+		buflen = ata_sff_data_xfer(dev, buf, buflen, rw);
+
+	return buflen;
+}
+
+static struct scsi_host_template winbond_sht = {
+	ATA_PIO_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations winbond_port_ops = {
+	.inherits	= &ata_sff_port_ops,
+	.sff_data_xfer	= winbond_data_xfer,
+	.cable_detect	= ata_cable_40wire,
+	.set_piomode	= winbond_set_piomode,
+};
+
+/**
+ *	winbond_init_one		-	attach a winbond interface
+ *	@type: Type to display
+ *	@io: I/O port start
+ *	@irq: interrupt line
+ *	@fast: True if on a > 33Mhz VLB
+ *
+ *	Register a VLB bus IDE interface. Such interfaces are PIO and we
+ *	assume do not support IRQ sharing.
+ */
+
+static __init int winbond_init_one(unsigned long port)
+{
+	struct platform_device *pdev;
+	u8 reg;
+	int i, rc;
+
+	reg = winbond_readcfg(port, 0x81);
+	reg |= 0x80;	/* jumpered mode off */
+	winbond_writecfg(port, 0x81, reg);
+	reg = winbond_readcfg(port, 0x83);
+	reg |= 0xF0;	/* local control */
+	winbond_writecfg(port, 0x83, reg);
+	reg = winbond_readcfg(port, 0x85);
+	reg |= 0xF0;	/* programmable timing */
+	winbond_writecfg(port, 0x85, reg);
+
+	reg = winbond_readcfg(port, 0x81);
+
+	if (!(reg & 0x03))		/* Disabled */
+		return -ENODEV;
+
+	for (i = 0; i < 2 ; i ++) {
+		unsigned long cmd_port = 0x1F0 - (0x80 * i);
+		unsigned long ctl_port = cmd_port + 0x206;
+		struct ata_host *host;
+		struct ata_port *ap;
+		void __iomem *cmd_addr, *ctl_addr;
+
+		if (!(reg & (1 << i)))
+			continue;
+
+		pdev = platform_device_register_simple(DRV_NAME, nr_winbond_host, NULL, 0);
+		if (IS_ERR(pdev))
+			return PTR_ERR(pdev);
+
+		rc = -ENOMEM;
+		host = ata_host_alloc(&pdev->dev, 1);
+		if (!host)
+			goto err_unregister;
+		ap = host->ports[0];
+
+		rc = -ENOMEM;
+		cmd_addr = devm_ioport_map(&pdev->dev, cmd_port, 8);
+		ctl_addr = devm_ioport_map(&pdev->dev, ctl_port, 1);
+		if (!cmd_addr || !ctl_addr)
+			goto err_unregister;
+
+		ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", cmd_port, ctl_port);
+
+		ap->ops = &winbond_port_ops;
+		ap->pio_mask = 0x1F;
+		ap->flags |= ATA_FLAG_SLAVE_POSS;
+		ap->ioaddr.cmd_addr = cmd_addr;
+		ap->ioaddr.altstatus_addr = ctl_addr;
+		ap->ioaddr.ctl_addr = ctl_addr;
+		ata_sff_std_ports(&ap->ioaddr);
+
+		/* hook in a private data structure per channel */
+		host->private_data = &winbond_data[nr_winbond_host];
+		winbond_data[nr_winbond_host].config = port;
+		winbond_data[nr_winbond_host].platform_dev = pdev;
+
+		/* activate */
+		rc = ata_host_activate(host, 14 + i, ata_sff_interrupt, 0,
+				       &winbond_sht);
+		if (rc)
+			goto err_unregister;
+
+		winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev);
+	}
+
+	return 0;
+
+ err_unregister:
+	platform_device_unregister(pdev);
+	return rc;
+}
+
+/**
+ *	winbond_init		-	attach winbond interfaces
+ *
+ *	Attach winbond IDE interfaces by scanning the ports it may occupy.
+ */
+
+static __init int winbond_init(void)
+{
+	static const unsigned long config[2] = { 0x130, 0x1B0 };
+
+	int ct = 0;
+	int i;
+
+	if (probe_winbond == 0)
+		return -ENODEV;
+
+	/*
+ 	 *	Check both base addresses
+	 */
+
+	for (i = 0; i < 2; i++) {
+		if (probe_winbond & (1<<i)) {
+			int ret = 0;
+			unsigned long port = config[i];
+
+			if (request_region(port, 2, "pata_winbond")) {
+				ret = winbond_init_one(port);
+				if (ret <= 0)
+					release_region(port, 2);
+				else ct+= ret;
+			}
+		}
+	}
+	if (ct != 0)
+		return 0;
+	return -ENODEV;
+}
+
+static __exit void winbond_exit(void)
+{
+	int i;
+
+	for (i = 0; i < nr_winbond_host; i++) {
+		ata_host_detach(winbond_host[i]);
+		release_region(winbond_data[i].config, 2);
+		platform_device_unregister(winbond_data[i].platform_dev);
+	}
+}
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Winbond VL ATA");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(winbond_init);
+module_exit(winbond_exit);
+
+module_param(probe_winbond, int, 0);
+