diff options
Diffstat (limited to 'drivers/scsi/libata-bmdma.c')
| -rw-r--r-- | drivers/scsi/libata-bmdma.c | 703 |
1 files changed, 703 insertions, 0 deletions
diff --git a/drivers/scsi/libata-bmdma.c b/drivers/scsi/libata-bmdma.c new file mode 100644 index 000000000000..a93336adcd23 --- /dev/null +++ b/drivers/scsi/libata-bmdma.c @@ -0,0 +1,703 @@ +/* + * libata-bmdma.c - helper library for PCI IDE BMDMA + * + * Maintained by: Jeff Garzik <jgarzik@pobox.com> + * Please ALWAYS copy linux-ide@vger.kernel.org + * on emails. + * + * Copyright 2003-2006 Red Hat, Inc. All rights reserved. + * Copyright 2003-2006 Jeff Garzik + * + * + * 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 from http://www.t13.org/ and + * http://www.sata-io.org/ + * + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/libata.h> + +#include "libata.h" + +/** + * ata_tf_load_pio - send taskfile registers to host controller + * @ap: Port to which output is sent + * @tf: ATA taskfile register set + * + * Outputs ATA taskfile to standard ATA host controller. + * + * LOCKING: + * Inherited from caller. + */ + +static void ata_tf_load_pio(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) { + outb(tf->ctl, ioaddr->ctl_addr); + ap->last_ctl = tf->ctl; + ata_wait_idle(ap); + } + + if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) { + outb(tf->hob_feature, ioaddr->feature_addr); + outb(tf->hob_nsect, ioaddr->nsect_addr); + outb(tf->hob_lbal, ioaddr->lbal_addr); + outb(tf->hob_lbam, ioaddr->lbam_addr); + outb(tf->hob_lbah, ioaddr->lbah_addr); + VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n", + tf->hob_feature, + tf->hob_nsect, + tf->hob_lbal, + tf->hob_lbam, + tf->hob_lbah); + } + + if (is_addr) { + outb(tf->feature, ioaddr->feature_addr); + outb(tf->nsect, ioaddr->nsect_addr); + outb(tf->lbal, ioaddr->lbal_addr); + outb(tf->lbam, ioaddr->lbam_addr); + outb(tf->lbah, ioaddr->lbah_addr); + VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n", + tf->feature, + tf->nsect, + tf->lbal, + tf->lbam, + tf->lbah); + } + + if (tf->flags & ATA_TFLAG_DEVICE) { + outb(tf->device, ioaddr->device_addr); + VPRINTK("device 0x%X\n", tf->device); + } + + ata_wait_idle(ap); +} + +/** + * ata_tf_load_mmio - send taskfile registers to host controller + * @ap: Port to which output is sent + * @tf: ATA taskfile register set + * + * Outputs ATA taskfile to standard ATA host controller using MMIO. + * + * LOCKING: + * Inherited from caller. + */ + +static void ata_tf_load_mmio(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, (void __iomem *) ap->ioaddr.ctl_addr); + ap->last_ctl = tf->ctl; + ata_wait_idle(ap); + } + + if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) { + writeb(tf->hob_feature, (void __iomem *) ioaddr->feature_addr); + writeb(tf->hob_nsect, (void __iomem *) ioaddr->nsect_addr); + writeb(tf->hob_lbal, (void __iomem *) ioaddr->lbal_addr); + writeb(tf->hob_lbam, (void __iomem *) ioaddr->lbam_addr); + writeb(tf->hob_lbah, (void __iomem *) ioaddr->lbah_addr); + VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n", + tf->hob_feature, + tf->hob_nsect, + tf->hob_lbal, + tf->hob_lbam, + tf->hob_lbah); + } + + if (is_addr) { + writeb(tf->feature, (void __iomem *) ioaddr->feature_addr); + writeb(tf->nsect, (void __iomem *) ioaddr->nsect_addr); + writeb(tf->lbal, (void __iomem *) ioaddr->lbal_addr); + writeb(tf->lbam, (void __iomem *) ioaddr->lbam_addr); + writeb(tf->lbah, (void __iomem *) ioaddr->lbah_addr); + VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n", + tf->feature, + tf->nsect, + tf->lbal, + tf->lbam, + tf->lbah); + } + + if (tf->flags & ATA_TFLAG_DEVICE) { + writeb(tf->device, (void __iomem *) ioaddr->device_addr); + VPRINTK("device 0x%X\n", tf->device); + } + + ata_wait_idle(ap); +} + + +/** + * ata_tf_load - send taskfile registers to host controller + * @ap: Port to which output is sent + * @tf: ATA taskfile register set + * + * Outputs ATA taskfile to standard ATA host controller using MMIO + * or PIO as indicated by the ATA_FLAG_MMIO flag. + * Writes the control, feature, nsect, lbal, lbam, and lbah registers. + * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect, + * hob_lbal, hob_lbam, and hob_lbah. + * + * This function waits for idle (!BUSY and !DRQ) after writing + * registers. If the control register has a new value, this + * function also waits for idle after writing control and before + * writing the remaining registers. + * + * May be used as the tf_load() entry in ata_port_operations. + * + * LOCKING: + * Inherited from caller. + */ +void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf) +{ + if (ap->flags & ATA_FLAG_MMIO) + ata_tf_load_mmio(ap, tf); + else + ata_tf_load_pio(ap, tf); +} + +/** + * ata_exec_command_pio - issue ATA command to host controller + * @ap: port to which command is being issued + * @tf: ATA taskfile register set + * + * Issues PIO write to ATA command register, with proper + * synchronization with interrupt handler / other threads. + * + * LOCKING: + * spin_lock_irqsave(host_set lock) + */ + +static void ata_exec_command_pio(struct ata_port *ap, const struct ata_taskfile *tf) +{ + DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command); + + outb(tf->command, ap->ioaddr.command_addr); + ata_pause(ap); +} + + +/** + * ata_exec_command_mmio - issue ATA command to host controller + * @ap: port to which command is being issued + * @tf: ATA taskfile register set + * + * Issues MMIO write to ATA command register, with proper + * synchronization with interrupt handler / other threads. + * + * LOCKING: + * spin_lock_irqsave(host_set lock) + */ + +static void ata_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf) +{ + DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command); + + writeb(tf->command, (void __iomem *) ap->ioaddr.command_addr); + ata_pause(ap); +} + + +/** + * ata_exec_command - issue ATA command to host controller + * @ap: port to which command is being issued + * @tf: ATA taskfile register set + * + * Issues PIO/MMIO write to ATA command register, with proper + * synchronization with interrupt handler / other threads. + * + * LOCKING: + * spin_lock_irqsave(host_set lock) + */ +void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf) +{ + if (ap->flags & ATA_FLAG_MMIO) + ata_exec_command_mmio(ap, tf); + else + ata_exec_command_pio(ap, tf); +} + +/** + * ata_tf_read_pio - input device's ATA taskfile shadow registers + * @ap: Port from which input is read + * @tf: ATA taskfile register set for storing input + * + * Reads ATA taskfile registers for currently-selected device + * into @tf. + * + * LOCKING: + * Inherited from caller. + */ + +static void ata_tf_read_pio(struct ata_port *ap, struct ata_taskfile *tf) +{ + struct ata_ioports *ioaddr = &ap->ioaddr; + + tf->command = ata_check_status(ap); + tf->feature = inb(ioaddr->error_addr); + tf->nsect = inb(ioaddr->nsect_addr); + tf->lbal = inb(ioaddr->lbal_addr); + tf->lbam = inb(ioaddr->lbam_addr); + tf->lbah = inb(ioaddr->lbah_addr); + tf->device = inb(ioaddr->device_addr); + + if (tf->flags & ATA_TFLAG_LBA48) { + outb(tf->ctl | ATA_HOB, ioaddr->ctl_addr); + tf->hob_feature = inb(ioaddr->error_addr); + tf->hob_nsect = inb(ioaddr->nsect_addr); + tf->hob_lbal = inb(ioaddr->lbal_addr); + tf->hob_lbam = inb(ioaddr->lbam_addr); + tf->hob_lbah = inb(ioaddr->lbah_addr); + } +} + +/** + * ata_tf_read_mmio - input device's ATA taskfile shadow registers + * @ap: Port from which input is read + * @tf: ATA taskfile register set for storing input + * + * Reads ATA taskfile registers for currently-selected device + * into @tf via MMIO. + * + * LOCKING: + * Inherited from caller. + */ + +static void ata_tf_read_mmio(struct ata_port *ap, struct ata_taskfile *tf) +{ + struct ata_ioports *ioaddr = &ap->ioaddr; + + tf->command = ata_check_status(ap); + tf->feature = readb((void __iomem *)ioaddr->error_addr); + tf->nsect = readb((void __iomem *)ioaddr->nsect_addr); + tf->lbal = readb((void __iomem *)ioaddr->lbal_addr); + tf->lbam = readb((void __iomem *)ioaddr->lbam_addr); + tf->lbah = readb((void __iomem *)ioaddr->lbah_addr); + tf->device = readb((void __iomem *)ioaddr->device_addr); + + if (tf->flags & ATA_TFLAG_LBA48) { + writeb(tf->ctl | ATA_HOB, (void __iomem *) ap->ioaddr.ctl_addr); + tf->hob_feature = readb((void __iomem *)ioaddr->error_addr); + tf->hob_nsect = readb((void __iomem *)ioaddr->nsect_addr); + tf->hob_lbal = readb((void __iomem *)ioaddr->lbal_addr); + tf->hob_lbam = readb((void __iomem *)ioaddr->lbam_addr); + tf->hob_lbah = readb((void __iomem *)ioaddr->lbah_addr); + } +} + + +/** + * ata_tf_read - input device's ATA taskfile shadow registers + * @ap: Port from which input is read + * @tf: ATA taskfile register set for storing input + * + * Reads ATA taskfile registers for currently-selected device + * into @tf. + * + * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48 + * is set, also reads the hob registers. + * + * May be used as the tf_read() entry in ata_port_operations. + * + * LOCKING: + * Inherited from caller. + */ +void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf) +{ + if (ap->flags & ATA_FLAG_MMIO) + ata_tf_read_mmio(ap, tf); + else + ata_tf_read_pio(ap, tf); +} + +/** + * ata_check_status_pio - Read device status reg & clear interrupt + * @ap: port where the device is + * + * Reads ATA taskfile status register for currently-selected device + * and return its value. This also clears pending interrupts + * from this device + * + * LOCKING: + * Inherited from caller. + */ +static u8 ata_check_status_pio(struct ata_port *ap) +{ + return inb(ap->ioaddr.status_addr); +} + +/** + * ata_check_status_mmio - Read device status reg & clear interrupt + * @ap: port where the device is + * + * Reads ATA taskfile status register for currently-selected device + * via MMIO and return its value. This also clears pending interrupts + * from this device + * + * LOCKING: + * Inherited from caller. + */ +static u8 ata_check_status_mmio(struct ata_port *ap) +{ + return readb((void __iomem *) ap->ioaddr.status_addr); +} + + +/** + * ata_check_status - Read device status reg & clear interrupt + * @ap: port where the device is + * + * Reads ATA taskfile status register for currently-selected device + * and return its value. This also clears pending interrupts + * from this device + * + * May be used as the check_status() entry in ata_port_operations. + * + * LOCKING: + * Inherited from caller. + */ +u8 ata_check_status(struct ata_port *ap) +{ + if (ap->flags & ATA_FLAG_MMIO) + return ata_check_status_mmio(ap); + return ata_check_status_pio(ap); +} + + +/** + * ata_altstatus - Read device alternate status reg + * @ap: port where the device is + * + * Reads ATA taskfile alternate status register for + * currently-selected device and return its value. + * + * Note: may NOT be used as the check_altstatus() entry in + * ata_port_operations. + * + * LOCKING: + * Inherited from caller. + */ +u8 ata_altstatus(struct ata_port *ap) +{ + if (ap->ops->check_altstatus) + return ap->ops->check_altstatus(ap); + + if (ap->flags & ATA_FLAG_MMIO) + return readb((void __iomem *)ap->ioaddr.altstatus_addr); + return inb(ap->ioaddr.altstatus_addr); +} + +#ifdef CONFIG_PCI +static struct ata_probe_ent * +ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port) +{ + struct ata_probe_ent *probe_ent; + + probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL); + if (!probe_ent) { + printk(KERN_ERR DRV_NAME "(%s): out of memory\n", + kobject_name(&(dev->kobj))); + return NULL; + } + + INIT_LIST_HEAD(&probe_ent->node); + probe_ent->dev = dev; + + probe_ent->sht = port->sht; + probe_ent->host_flags = port->host_flags; + probe_ent->pio_mask = port->pio_mask; + probe_ent->mwdma_mask = port->mwdma_mask; + probe_ent->udma_mask = port->udma_mask; + probe_ent->port_ops = port->port_ops; + + return probe_ent; +} + + +/** + * ata_pci_init_native_mode - Initialize native-mode driver + * @pdev: pci device to be initialized + * @port: array[2] of pointers to port info structures. + * @ports: bitmap of ports present + * + * Utility function which allocates and initializes an + * ata_probe_ent structure for a standard dual-port + * PIO-based IDE controller. The returned ata_probe_ent + * structure can be passed to ata_device_add(). The returned + * ata_probe_ent structure should then be freed with kfree(). + * + * The caller need only pass the address of the primary port, the + * secondary will be deduced automatically. If the device has non + * standard secondary port mappings this function can be called twice, + * once for each interface. + */ + +struct ata_probe_ent * +ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int ports) +{ + struct ata_probe_ent *probe_ent = + ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]); + int p = 0; + + if (!probe_ent) + return NULL; + + probe_ent->irq = pdev->irq; + probe_ent->irq_flags = SA_SHIRQ; + probe_ent->private_data = port[0]->private_data; + + if (ports & ATA_PORT_PRIMARY) { + probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 0); + probe_ent->port[p].altstatus_addr = + probe_ent->port[p].ctl_addr = + pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS; + probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4); + ata_std_ports(&probe_ent->port[p]); + p++; + } + + if (ports & ATA_PORT_SECONDARY) { + probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 2); + probe_ent->port[p].altstatus_addr = + probe_ent->port[p].ctl_addr = + pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS; + probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4) + 8; + ata_std_ports(&probe_ent->port[p]); + p++; + } + + probe_ent->n_ports = p; + return probe_ent; +} + + +static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev, + struct ata_port_info *port, int port_num) +{ + struct ata_probe_ent *probe_ent; + + probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port); + if (!probe_ent) + return NULL; + + probe_ent->legacy_mode = 1; + probe_ent->n_ports = 1; + probe_ent->hard_port_no = port_num; + probe_ent->private_data = port->private_data; + + switch(port_num) + { + case 0: + probe_ent->irq = 14; + probe_ent->port[0].cmd_addr = 0x1f0; + probe_ent->port[0].altstatus_addr = + probe_ent->port[0].ctl_addr = 0x3f6; + break; + case 1: + probe_ent->irq = 15; + probe_ent->port[0].cmd_addr = 0x170; + probe_ent->port[0].altstatus_addr = + probe_ent->port[0].ctl_addr = 0x376; + break; + } + + probe_ent->port[0].bmdma_addr = + pci_resource_start(pdev, 4) + 8 * port_num; + ata_std_ports(&probe_ent->port[0]); + + return probe_ent; +} + + +/** + * ata_pci_init_one - Initialize/register PCI IDE host controller + * @pdev: Controller to be initialized + * @port_info: Information from low-level host driver + * @n_ports: Number of ports attached to host controller + * + * This is a helper function which can be called from a driver's + * xxx_init_one() probe function if the hardware uses traditional + * IDE taskfile registers. + * + * This function calls pci_enable_device(), reserves its register + * regions, sets the dma mask, enables bus master mode, and calls + * ata_device_add() + * + * LOCKING: + * Inherited from PCI layer (may sleep). + * + * RETURNS: + * Zero on success, negative on errno-based value on error. + */ + +int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info, + unsigned int n_ports) +{ + struct ata_probe_ent *probe_ent = NULL, *probe_ent2 = NULL; + struct ata_port_info *port[2]; + u8 tmp8, mask; + unsigned int legacy_mode = 0; + int disable_dev_on_err = 1; + int rc; + + DPRINTK("ENTER\n"); + + port[0] = port_info[0]; + if (n_ports > 1) + port[1] = port_info[1]; + else + port[1] = port[0]; + + if ((port[0]->host_flags & ATA_FLAG_NO_LEGACY) == 0 + && (pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) { + /* TODO: What if one channel is in native mode ... */ + pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8); + mask = (1 << 2) | (1 << 0); + if ((tmp8 & mask) != mask) + legacy_mode = (1 << 3); + } + + /* FIXME... */ + if ((!legacy_mode) && (n_ports > 2)) { + printk(KERN_ERR "ata: BUG: native mode, n_ports > 2\n"); + n_ports = 2; + /* For now */ + } + + /* FIXME: Really for ATA it isn't safe because the device may be + multi-purpose and we want to leave it alone if it was already + enabled. Secondly for shared use as Arjan says we want refcounting + + Checking dev->is_enabled is insufficient as this is not set at + boot for the primary video which is BIOS enabled + */ + + rc = pci_enable_device(pdev); + if (rc) + return rc; + + rc = pci_request_regions(pdev, DRV_NAME); + if (rc) { + disable_dev_on_err = 0; + goto err_out; + } + + /* FIXME: Should use platform specific mappers for legacy port ranges */ + if (legacy_mode) { + if (!request_region(0x1f0, 8, "libata")) { + struct resource *conflict, res; + res.start = 0x1f0; + res.end = 0x1f0 + 8 - 1; + conflict = ____request_resource(&ioport_resource, &res); + if (!strcmp(conflict->name, "libata")) + legacy_mode |= (1 << 0); + else { + disable_dev_on_err = 0; + printk(KERN_WARNING "ata: 0x1f0 IDE port busy\n"); + } + } else + legacy_mode |= (1 << 0); + + if (!request_region(0x170, 8, "libata")) { + struct resource *conflict, res; + res.start = 0x170; + res.end = 0x170 + 8 - 1; + conflict = ____request_resource(&ioport_resource, &res); + if (!strcmp(conflict->name, "libata")) + legacy_mode |= (1 << 1); + else { + disable_dev_on_err = 0; + printk(KERN_WARNING "ata: 0x170 IDE port busy\n"); + } + } else + legacy_mode |= (1 << 1); + } + + /* we have legacy mode, but all ports are unavailable */ + if (legacy_mode == (1 << 3)) { + rc = -EBUSY; + goto err_out_regions; + } + + 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; + + if (legacy_mode) { + if (legacy_mode & (1 << 0)) + probe_ent = ata_pci_init_legacy_port(pdev, port[0], 0); + if (legacy_mode & (1 << 1)) + probe_ent2 = ata_pci_init_legacy_port(pdev, port[1], 1); + } else { + if (n_ports == 2) + probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY); + else + probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY); + } + if (!probe_ent && !probe_ent2) { + rc = -ENOMEM; + goto err_out_regions; + } + + pci_set_master(pdev); + + /* FIXME: check ata_device_add return */ + if (legacy_mode) { + if (legacy_mode & (1 << 0)) + ata_device_add(probe_ent); + if (legacy_mode & (1 << 1)) + ata_device_add(probe_ent2); + } else + ata_device_add(probe_ent); + + kfree(probe_ent); + kfree(probe_ent2); + + return 0; + +err_out_regions: + if (legacy_mode & (1 << 0)) + release_region(0x1f0, 8); + if (legacy_mode & (1 << 1)) + release_region(0x170, 8); + pci_release_regions(pdev); +err_out: + if (disable_dev_on_err) + pci_disable_device(pdev); + return rc; +} + +#endif /* CONFIG_PCI */ + |