Move libata to drivers/ata.

1 files changed, 508 insertions, 0 deletions

diff --git a/drivers/ata/sata_svw.c b/drivers/ata/sata_svw.c
new file mode 100644
index 0000000..baf259a
--- /dev/null
+++ b/drivers/ata/sata_svw.c
@@ -0,0 +1,508 @@
+/*
+ *  sata_svw.c - ServerWorks / Apple K2 SATA
+ *
+ *  Maintained by: Benjamin Herrenschmidt <benh@kernel.crashing.org> and
+ *		   Jeff Garzik <jgarzik@pobox.com>
+ *  		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ *
+ *  Bits from Jeff Garzik, Copyright RedHat, Inc.
+ *
+ *  This driver probably works with non-Apple versions of the
+ *  Broadcom chipset...
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  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; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available under NDA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#ifdef CONFIG_PPC_OF
+#include <asm/prom.h>
+#include <asm/pci-bridge.h>
+#endif /* CONFIG_PPC_OF */
+
+#define DRV_NAME	"sata_svw"
+#define DRV_VERSION	"2.0"
+
+enum {
+	/* Taskfile registers offsets */
+	K2_SATA_TF_CMD_OFFSET		= 0x00,
+	K2_SATA_TF_DATA_OFFSET		= 0x00,
+	K2_SATA_TF_ERROR_OFFSET		= 0x04,
+	K2_SATA_TF_NSECT_OFFSET		= 0x08,
+	K2_SATA_TF_LBAL_OFFSET		= 0x0c,
+	K2_SATA_TF_LBAM_OFFSET		= 0x10,
+	K2_SATA_TF_LBAH_OFFSET		= 0x14,
+	K2_SATA_TF_DEVICE_OFFSET	= 0x18,
+	K2_SATA_TF_CMDSTAT_OFFSET      	= 0x1c,
+	K2_SATA_TF_CTL_OFFSET		= 0x20,
+
+	/* DMA base */
+	K2_SATA_DMA_CMD_OFFSET		= 0x30,
+
+	/* SCRs base */
+	K2_SATA_SCR_STATUS_OFFSET	= 0x40,
+	K2_SATA_SCR_ERROR_OFFSET	= 0x44,
+	K2_SATA_SCR_CONTROL_OFFSET	= 0x48,
+
+	/* Others */
+	K2_SATA_SICR1_OFFSET		= 0x80,
+	K2_SATA_SICR2_OFFSET		= 0x84,
+	K2_SATA_SIM_OFFSET		= 0x88,
+
+	/* Port stride */
+	K2_SATA_PORT_OFFSET		= 0x100,
+};
+
+static u8 k2_stat_check_status(struct ata_port *ap);
+
+
+static u32 k2_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+	return readl((void *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void k2_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
+			       u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return;
+	writel(val, (void *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void k2_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+	if (tf->ctl != ap->last_ctl) {
+		writeb(tf->ctl, ioaddr->ctl_addr);
+		ap->last_ctl = tf->ctl;
+		ata_wait_idle(ap);
+	}
+	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+		writew(tf->feature | (((u16)tf->hob_feature) << 8), ioaddr->feature_addr);
+		writew(tf->nsect | (((u16)tf->hob_nsect) << 8), ioaddr->nsect_addr);
+		writew(tf->lbal | (((u16)tf->hob_lbal) << 8), ioaddr->lbal_addr);
+		writew(tf->lbam | (((u16)tf->hob_lbam) << 8), ioaddr->lbam_addr);
+		writew(tf->lbah | (((u16)tf->hob_lbah) << 8), ioaddr->lbah_addr);
+	} else if (is_addr) {
+		writew(tf->feature, ioaddr->feature_addr);
+		writew(tf->nsect, ioaddr->nsect_addr);
+		writew(tf->lbal, ioaddr->lbal_addr);
+		writew(tf->lbam, ioaddr->lbam_addr);
+		writew(tf->lbah, ioaddr->lbah_addr);
+	}
+
+	if (tf->flags & ATA_TFLAG_DEVICE)
+		writeb(tf->device, ioaddr->device_addr);
+
+	ata_wait_idle(ap);
+}
+
+
+static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	u16 nsect, lbal, lbam, lbah, feature;
+
+	tf->command = k2_stat_check_status(ap);
+	tf->device = readw(ioaddr->device_addr);
+	feature = readw(ioaddr->error_addr);
+	nsect = readw(ioaddr->nsect_addr);
+	lbal = readw(ioaddr->lbal_addr);
+	lbam = readw(ioaddr->lbam_addr);
+	lbah = readw(ioaddr->lbah_addr);
+
+	tf->feature = feature;
+	tf->nsect = nsect;
+	tf->lbal = lbal;
+	tf->lbam = lbam;
+	tf->lbah = lbah;
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		tf->hob_feature = feature >> 8;
+		tf->hob_nsect = nsect >> 8;
+		tf->hob_lbal = lbal >> 8;
+		tf->hob_lbam = lbam >> 8;
+		tf->hob_lbah = lbah >> 8;
+        }
+}
+
+/**
+ *	k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void k2_bmdma_setup_mmio (struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
+	u8 dmactl;
+	void *mmio = (void *) ap->ioaddr.bmdma_addr;
+	/* load PRD table addr. */
+	mb();	/* make sure PRD table writes are visible to controller */
+	writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
+
+	/* specify data direction, triple-check start bit is clear */
+	dmactl = readb(mmio + ATA_DMA_CMD);
+	dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
+	if (!rw)
+		dmactl |= ATA_DMA_WR;
+	writeb(dmactl, mmio + ATA_DMA_CMD);
+
+	/* issue r/w command if this is not a ATA DMA command*/
+	if (qc->tf.protocol != ATA_PROT_DMA)
+		ap->ops->exec_command(ap, &qc->tf);
+}
+
+/**
+ *	k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void k2_bmdma_start_mmio (struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	void *mmio = (void *) ap->ioaddr.bmdma_addr;
+	u8 dmactl;
+
+	/* start host DMA transaction */
+	dmactl = readb(mmio + ATA_DMA_CMD);
+	writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
+	/* There is a race condition in certain SATA controllers that can
+	   be seen when the r/w command is given to the controller before the
+	   host DMA is started. On a Read command, the controller would initiate
+	   the command to the drive even before it sees the DMA start. When there
+	   are very fast drives connected to the controller, or when the data request
+	   hits in the drive cache, there is the possibility that the drive returns a part
+	   or all of the requested data to the controller before the DMA start is issued.
+	   In this case, the controller would become confused as to what to do with the data.
+	   In the worst case when all the data is returned back to the controller, the
+	   controller could hang. In other cases it could return partial data returning
+	   in data corruption. This problem has been seen in PPC systems and can also appear
+	   on an system with very fast disks, where the SATA controller is sitting behind a
+	   number of bridges, and hence there is significant latency between the r/w command
+	   and the start command. */
+	/* issue r/w command if the access is to ATA*/
+	if (qc->tf.protocol == ATA_PROT_DMA)
+		ap->ops->exec_command(ap, &qc->tf);
+}
+
+
+static u8 k2_stat_check_status(struct ata_port *ap)
+{
+       	return readl((void *) ap->ioaddr.status_addr);
+}
+
+#ifdef CONFIG_PPC_OF
+/*
+ * k2_sata_proc_info
+ * inout : decides on the direction of the dataflow and the meaning of the
+ *	   variables
+ * buffer: If inout==FALSE data is being written to it else read from it
+ * *start: If inout==FALSE start of the valid data in the buffer
+ * offset: If inout==FALSE offset from the beginning of the imaginary file
+ *	   from which we start writing into the buffer
+ * length: If inout==FALSE max number of bytes to be written into the buffer
+ *	   else number of bytes in the buffer
+ */
+static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
+			     off_t offset, int count, int inout)
+{
+	struct ata_port *ap;
+	struct device_node *np;
+	int len, index;
+
+	/* Find  the ata_port */
+	ap = ata_shost_to_port(shost);
+	if (ap == NULL)
+		return 0;
+
+	/* Find the OF node for the PCI device proper */
+	np = pci_device_to_OF_node(to_pci_dev(ap->host_set->dev));
+	if (np == NULL)
+		return 0;
+
+	/* Match it to a port node */
+	index = (ap == ap->host_set->ports[0]) ? 0 : 1;
+	for (np = np->child; np != NULL; np = np->sibling) {
+		u32 *reg = (u32 *)get_property(np, "reg", NULL);
+		if (!reg)
+			continue;
+		if (index == *reg)
+			break;
+	}
+	if (np == NULL)
+		return 0;
+
+	len = sprintf(page, "devspec: %s\n", np->full_name);
+
+	return len;
+}
+#endif /* CONFIG_PPC_OF */
+
+
+static struct scsi_host_template k2_sata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+#ifdef CONFIG_PPC_OF
+	.proc_info		= k2_sata_proc_info,
+#endif
+	.bios_param		= ata_std_bios_param,
+};
+
+
+static const struct ata_port_operations k2_sata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= k2_sata_tf_load,
+	.tf_read		= k2_sata_tf_read,
+	.check_status		= k2_stat_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup		= k2_bmdma_setup_mmio,
+	.bmdma_start		= k2_bmdma_start_mmio,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= k2_sata_scr_read,
+	.scr_write		= k2_sata_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_pci_host_stop,
+};
+
+static void k2_sata_setup_port(struct ata_ioports *port, unsigned long base)
+{
+	port->cmd_addr		= base + K2_SATA_TF_CMD_OFFSET;
+	port->data_addr		= base + K2_SATA_TF_DATA_OFFSET;
+	port->feature_addr	=
+	port->error_addr	= base + K2_SATA_TF_ERROR_OFFSET;
+	port->nsect_addr	= base + K2_SATA_TF_NSECT_OFFSET;
+	port->lbal_addr		= base + K2_SATA_TF_LBAL_OFFSET;
+	port->lbam_addr		= base + K2_SATA_TF_LBAM_OFFSET;
+	port->lbah_addr		= base + K2_SATA_TF_LBAH_OFFSET;
+	port->device_addr	= base + K2_SATA_TF_DEVICE_OFFSET;
+	port->command_addr	=
+	port->status_addr	= base + K2_SATA_TF_CMDSTAT_OFFSET;
+	port->altstatus_addr	=
+	port->ctl_addr		= base + K2_SATA_TF_CTL_OFFSET;
+	port->bmdma_addr	= base + K2_SATA_DMA_CMD_OFFSET;
+	port->scr_addr		= base + K2_SATA_SCR_STATUS_OFFSET;
+}
+
+
+static int k2_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	unsigned long base;
+	void __iomem *mmio_base;
+	int pci_dev_busy = 0;
+	int rc;
+	int i;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	/*
+	 * If this driver happens to only be useful on Apple's K2, then
+	 * we should check that here as it has a normal Serverworks ID
+	 */
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+	/*
+	 * Check if we have resources mapped at all (second function may
+	 * have been disabled by firmware)
+	 */
+	if (pci_resource_len(pdev, 5) == 0)
+		return -ENODEV;
+
+	/* Request PCI regions */
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = pci_iomap(pdev, 5, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+	base = (unsigned long) mmio_base;
+
+	/* Clear a magic bit in SCR1 according to Darwin, those help
+	 * some funky seagate drives (though so far, those were already
+	 * set by the firmware on the machines I had access to)
+	 */
+	writel(readl(mmio_base + K2_SATA_SICR1_OFFSET) & ~0x00040000,
+	       mmio_base + K2_SATA_SICR1_OFFSET);
+
+	/* Clear SATA error & interrupts we don't use */
+	writel(0xffffffff, mmio_base + K2_SATA_SCR_ERROR_OFFSET);
+	writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
+
+	probe_ent->sht = &k2_sata_sht;
+	probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				ATA_FLAG_MMIO;
+	probe_ent->port_ops = &k2_sata_ops;
+	probe_ent->n_ports = 4;
+	probe_ent->irq = pdev->irq;
+	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->mmio_base = mmio_base;
+
+	/* We don't care much about the PIO/UDMA masks, but the core won't like us
+	 * if we don't fill these
+	 */
+	probe_ent->pio_mask = 0x1f;
+	probe_ent->mwdma_mask = 0x7;
+	probe_ent->udma_mask = 0x7f;
+
+	/* different controllers have different number of ports - currently 4 or 8 */
+	/* All ports are on the same function. Multi-function device is no
+	 * longer available. This should not be seen in any system. */
+	for (i = 0; i < ent->driver_data; i++)
+		k2_sata_setup_port(&probe_ent->port[i], base + i * K2_SATA_PORT_OFFSET);
+
+	pci_set_master(pdev);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+/* 0x240 is device ID for Apple K2 device
+ * 0x241 is device ID for Serverworks Frodo4
+ * 0x242 is device ID for Serverworks Frodo8
+ * 0x24a is device ID for BCM5785 (aka HT1000) HT southbridge integrated SATA
+ * controller
+ * */
+static const struct pci_device_id k2_sata_pci_tbl[] = {
+	{ 0x1166, 0x0240, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
+	{ 0x1166, 0x0241, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
+	{ 0x1166, 0x0242, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 8 },
+	{ 0x1166, 0x024a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
+	{ 0x1166, 0x024b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
+	{ }
+};
+
+
+static struct pci_driver k2_sata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= k2_sata_pci_tbl,
+	.probe			= k2_sata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+
+static int __init k2_sata_init(void)
+{
+	return pci_register_driver(&k2_sata_pci_driver);
+}
+
+
+static void __exit k2_sata_exit(void)
+{
+	pci_unregister_driver(&k2_sata_pci_driver);
+}
+
+
+MODULE_AUTHOR("Benjamin Herrenschmidt");
+MODULE_DESCRIPTION("low-level driver for K2 SATA controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, k2_sata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(k2_sata_init);
+module_exit(k2_sata_exit);