diff options
Diffstat (limited to 'drivers/scsi/sata_vsc.c')
| -rw-r--r-- | drivers/scsi/sata_vsc.c | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c new file mode 100644 index 0000000..2c28f0a --- /dev/null +++ b/drivers/scsi/sata_vsc.c @@ -0,0 +1,407 @@ +/* + * sata_vsc.c - Vitesse VSC7174 4 port DPA SATA + * + * Maintained by: Jeremy Higdon @ SGI + * Please ALWAYS copy linux-ide@vger.kernel.org + * on emails. + * + * Copyright 2004 SGI + * + * Bits from Jeff Garzik, Copyright RedHat, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#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 "scsi.h" +#include <scsi/scsi_host.h> +#include <linux/libata.h> + +#define DRV_NAME "sata_vsc" +#define DRV_VERSION "1.0" + +/* Interrupt register offsets (from chip base address) */ +#define VSC_SATA_INT_STAT_OFFSET 0x00 +#define VSC_SATA_INT_MASK_OFFSET 0x04 + +/* Taskfile registers offsets */ +#define VSC_SATA_TF_CMD_OFFSET 0x00 +#define VSC_SATA_TF_DATA_OFFSET 0x00 +#define VSC_SATA_TF_ERROR_OFFSET 0x04 +#define VSC_SATA_TF_FEATURE_OFFSET 0x06 +#define VSC_SATA_TF_NSECT_OFFSET 0x08 +#define VSC_SATA_TF_LBAL_OFFSET 0x0c +#define VSC_SATA_TF_LBAM_OFFSET 0x10 +#define VSC_SATA_TF_LBAH_OFFSET 0x14 +#define VSC_SATA_TF_DEVICE_OFFSET 0x18 +#define VSC_SATA_TF_STATUS_OFFSET 0x1c +#define VSC_SATA_TF_COMMAND_OFFSET 0x1d +#define VSC_SATA_TF_ALTSTATUS_OFFSET 0x28 +#define VSC_SATA_TF_CTL_OFFSET 0x29 + +/* DMA base */ +#define VSC_SATA_UP_DESCRIPTOR_OFFSET 0x64 +#define VSC_SATA_UP_DATA_BUFFER_OFFSET 0x6C +#define VSC_SATA_DMA_CMD_OFFSET 0x70 + +/* SCRs base */ +#define VSC_SATA_SCR_STATUS_OFFSET 0x100 +#define VSC_SATA_SCR_ERROR_OFFSET 0x104 +#define VSC_SATA_SCR_CONTROL_OFFSET 0x108 + +/* Port stride */ +#define VSC_SATA_PORT_OFFSET 0x200 + + +static u32 vsc_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 vsc_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 vsc_intr_mask_update(struct ata_port *ap, u8 ctl) +{ + unsigned long mask_addr; + u8 mask; + + mask_addr = (unsigned long) ap->host_set->mmio_base + + VSC_SATA_INT_MASK_OFFSET + ap->port_no; + mask = readb(mask_addr); + if (ctl & ATA_NIEN) + mask |= 0x80; + else + mask &= 0x7F; + writeb(mask, mask_addr); +} + + +static void vsc_sata_tf_load(struct ata_port *ap, struct ata_taskfile *tf) +{ + struct ata_ioports *ioaddr = &ap->ioaddr; + unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR; + + /* + * The only thing the ctl register is used for is SRST. + * That is not enabled or disabled via tf_load. + * However, if ATA_NIEN is changed, then we need to change the interrupt register. + */ + if ((tf->ctl & ATA_NIEN) != (ap->last_ctl & ATA_NIEN)) { + ap->last_ctl = tf->ctl; + vsc_intr_mask_update(ap, tf->ctl & ATA_NIEN); + } + 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 vsc_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf) +{ + struct ata_ioports *ioaddr = &ap->ioaddr; + u16 nsect, lbal, lbam, lbah; + + nsect = tf->nsect = readw(ioaddr->nsect_addr); + lbal = tf->lbal = readw(ioaddr->lbal_addr); + lbam = tf->lbam = readw(ioaddr->lbam_addr); + lbah = tf->lbah = readw(ioaddr->lbah_addr); + tf->device = readw(ioaddr->device_addr); + + if (tf->flags & ATA_TFLAG_LBA48) { + tf->hob_feature = readb(ioaddr->error_addr); + tf->hob_nsect = nsect >> 8; + tf->hob_lbal = lbal >> 8; + tf->hob_lbam = lbam >> 8; + tf->hob_lbah = lbah >> 8; + } +} + + +/* + * vsc_sata_interrupt + * + * Read the interrupt register and process for the devices that have them pending. + */ +static irqreturn_t vsc_sata_interrupt (int irq, void *dev_instance, + struct pt_regs *regs) +{ + struct ata_host_set *host_set = dev_instance; + unsigned int i; + unsigned int handled = 0; + u32 int_status; + + spin_lock(&host_set->lock); + + int_status = readl(host_set->mmio_base + VSC_SATA_INT_STAT_OFFSET); + + for (i = 0; i < host_set->n_ports; i++) { + if (int_status & ((u32) 0xFF << (8 * i))) { + struct ata_port *ap; + + ap = host_set->ports[i]; + if (ap && (!(ap->flags & ATA_FLAG_PORT_DISABLED))) { + struct ata_queued_cmd *qc; + + qc = ata_qc_from_tag(ap, ap->active_tag); + if (qc && (!(qc->tf.ctl & ATA_NIEN))) + handled += ata_host_intr(ap, qc); + } + } + } + + spin_unlock(&host_set->lock); + + return IRQ_RETVAL(handled); +} + + +static Scsi_Host_Template vsc_sata_sht = { + .module = THIS_MODULE, + .name = DRV_NAME, + .ioctl = ata_scsi_ioctl, + .queuecommand = ata_scsi_queuecmd, + .eh_strategy_handler = ata_scsi_error, + .can_queue = ATA_DEF_QUEUE, + .this_id = ATA_SHT_THIS_ID, + .sg_tablesize = LIBATA_MAX_PRD, + .max_sectors = ATA_MAX_SECTORS, + .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, + .bios_param = ata_std_bios_param, + .ordered_flush = 1, +}; + + +static struct ata_port_operations vsc_sata_ops = { + .port_disable = ata_port_disable, + .tf_load = vsc_sata_tf_load, + .tf_read = vsc_sata_tf_read, + .exec_command = ata_exec_command, + .check_status = ata_check_status, + .dev_select = ata_std_dev_select, + .phy_reset = sata_phy_reset, + .bmdma_setup = ata_bmdma_setup, + .bmdma_start = ata_bmdma_start, + .bmdma_stop = ata_bmdma_stop, + .bmdma_status = ata_bmdma_status, + .qc_prep = ata_qc_prep, + .qc_issue = ata_qc_issue_prot, + .eng_timeout = ata_eng_timeout, + .irq_handler = vsc_sata_interrupt, + .irq_clear = ata_bmdma_irq_clear, + .scr_read = vsc_sata_scr_read, + .scr_write = vsc_sata_scr_write, + .port_start = ata_port_start, + .port_stop = ata_port_stop, +}; + +static void __devinit vsc_sata_setup_port(struct ata_ioports *port, unsigned long base) +{ + port->cmd_addr = base + VSC_SATA_TF_CMD_OFFSET; + port->data_addr = base + VSC_SATA_TF_DATA_OFFSET; + port->error_addr = base + VSC_SATA_TF_ERROR_OFFSET; + port->feature_addr = base + VSC_SATA_TF_FEATURE_OFFSET; + port->nsect_addr = base + VSC_SATA_TF_NSECT_OFFSET; + port->lbal_addr = base + VSC_SATA_TF_LBAL_OFFSET; + port->lbam_addr = base + VSC_SATA_TF_LBAM_OFFSET; + port->lbah_addr = base + VSC_SATA_TF_LBAH_OFFSET; + port->device_addr = base + VSC_SATA_TF_DEVICE_OFFSET; + port->status_addr = base + VSC_SATA_TF_STATUS_OFFSET; + port->command_addr = base + VSC_SATA_TF_COMMAND_OFFSET; + port->altstatus_addr = base + VSC_SATA_TF_ALTSTATUS_OFFSET; + port->ctl_addr = base + VSC_SATA_TF_CTL_OFFSET; + port->bmdma_addr = base + VSC_SATA_DMA_CMD_OFFSET; + port->scr_addr = base + VSC_SATA_SCR_STATUS_OFFSET; + writel(0, base + VSC_SATA_UP_DESCRIPTOR_OFFSET); + writel(0, base + VSC_SATA_UP_DATA_BUFFER_OFFSET); +} + + +static int __devinit vsc_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; + int pci_dev_busy = 0; + void *mmio_base; + int rc; + + if (!printed_version++) + printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n"); + + rc = pci_enable_device(pdev); + if (rc) + return rc; + + /* + * Check if we have needed resource mapped. + */ + if (pci_resource_len(pdev, 0) == 0) { + rc = -ENODEV; + goto err_out; + } + + rc = pci_request_regions(pdev, DRV_NAME); + if (rc) { + pci_dev_busy = 1; + goto err_out; + } + + /* + * Use 32 bit DMA mask, because 64 bit address support is poor. + */ + rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK); + if (rc) + goto err_out_regions; + rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_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 = ioremap(pci_resource_start(pdev, 0), + pci_resource_len(pdev, 0)); + if (mmio_base == NULL) { + rc = -ENOMEM; + goto err_out_free_ent; + } + base = (unsigned long) mmio_base; + + /* + * Due to a bug in the chip, the default cache line size can't be used + */ + pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80); + + probe_ent->sht = &vsc_sata_sht; + probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | + ATA_FLAG_MMIO | ATA_FLAG_SATA_RESET; + probe_ent->port_ops = &vsc_sata_ops; + probe_ent->n_ports = 4; + probe_ent->irq = pdev->irq; + probe_ent->irq_flags = SA_SHIRQ; + 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 = 0x07; + probe_ent->udma_mask = 0x7f; + + /* We have 4 ports per PCI function */ + vsc_sata_setup_port(&probe_ent->port[0], base + 1 * VSC_SATA_PORT_OFFSET); + vsc_sata_setup_port(&probe_ent->port[1], base + 2 * VSC_SATA_PORT_OFFSET); + vsc_sata_setup_port(&probe_ent->port[2], base + 3 * VSC_SATA_PORT_OFFSET); + vsc_sata_setup_port(&probe_ent->port[3], base + 4 * VSC_SATA_PORT_OFFSET); + + pci_set_master(pdev); + + /* + * Config offset 0x98 is "Extended Control and Status Register 0" + * Default value is (1 << 28). All bits except bit 28 are reserved in + * DPA mode. If bit 28 is set, LED 0 reflects all ports' activity. + * If bit 28 is clear, each port has its own LED. + */ + pci_write_config_dword(pdev, 0x98, 0); + + /* 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; +} + + +/* + * 0x1725/0x7174 is the Vitesse VSC-7174 + * 0x8086/0x3200 is the Intel 31244, which is supposed to be identical + * compatibility is untested as of yet + */ +static struct pci_device_id vsc_sata_pci_tbl[] = { + { 0x1725, 0x7174, PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 }, + { 0x8086, 0x3200, PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 }, + { } +}; + + +static struct pci_driver vsc_sata_pci_driver = { + .name = DRV_NAME, + .id_table = vsc_sata_pci_tbl, + .probe = vsc_sata_init_one, + .remove = ata_pci_remove_one, +}; + + +static int __init vsc_sata_init(void) +{ + return pci_module_init(&vsc_sata_pci_driver); +} + + +static void __exit vsc_sata_exit(void) +{ + pci_unregister_driver(&vsc_sata_pci_driver); +} + + +MODULE_AUTHOR("Jeremy Higdon"); +MODULE_DESCRIPTION("low-level driver for Vitesse VSC7174 SATA controller"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(pci, vsc_sata_pci_tbl); +MODULE_VERSION(DRV_VERSION); + +module_init(vsc_sata_init); +module_exit(vsc_sata_exit); |
