--- /dev/null
+/*
+ * 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/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi.h>
+#include <linux/libata.h>
+#include <linux/of.h>
+
+#define DRV_NAME "sata_svw"
+#define DRV_VERSION "2.3"
+
+enum {
+ /* ap->flags bits */
+ K2_FLAG_SATA_8_PORTS = (1 << 24),
+ K2_FLAG_NO_ATAPI_DMA = (1 << 25),
+ K2_FLAG_BAR_POS_3 = (1 << 26),
+
+ /* 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,
+
+ chip_svw4 = 0,
+ chip_svw8 = 1,
+ chip_svw42 = 2, /* bar 3 */
+ chip_svw43 = 3, /* bar 5 */
+};
+
+static u8 k2_stat_check_status(struct ata_port *ap);
+
+
+static int k2_sata_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+ u8 cmnd = qc->scsicmd->cmnd[0];
+
+ if (qc->ap->flags & K2_FLAG_NO_ATAPI_DMA)
+ return -1; /* ATAPI DMA not supported */
+ else {
+ switch (cmnd) {
+ case READ_10:
+ case READ_12:
+ case READ_16:
+ case WRITE_10:
+ case WRITE_12:
+ case WRITE_16:
+ return 0;
+
+ default:
+ return -1;
+ }
+
+ }
+}
+
+static int k2_sata_scr_read(struct ata_link *link,
+ unsigned int sc_reg, u32 *val)
+{
+ if (sc_reg > SCR_CONTROL)
+ return -EINVAL;
+ *val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
+ return 0;
+}
+
+
+static int k2_sata_scr_write(struct ata_link *link,
+ unsigned int sc_reg, u32 val)
+{
+ if (sc_reg > SCR_CONTROL)
+ return -EINVAL;
+ writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
+ return 0;
+}
+
+static int k2_sata_softreset(struct ata_link *link,
+ unsigned int *class, unsigned long deadline)
+{
+ u8 dmactl;
+ void __iomem *mmio = link->ap->ioaddr.bmdma_addr;
+
+ dmactl = readb(mmio + ATA_DMA_CMD);
+
+ /* Clear the start bit */
+ if (dmactl & ATA_DMA_START) {
+ dmactl &= ~ATA_DMA_START;
+ writeb(dmactl, mmio + ATA_DMA_CMD);
+ }
+
+ return ata_sff_softreset(link, class, deadline);
+}
+
+static int k2_sata_hardreset(struct ata_link *link,
+ unsigned int *class, unsigned long deadline)
+{
+ u8 dmactl;
+ void __iomem *mmio = link->ap->ioaddr.bmdma_addr;
+
+ dmactl = readb(mmio + ATA_DMA_CMD);
+
+ /* Clear the start bit */
+ if (dmactl & ATA_DMA_START) {
+ dmactl &= ~ATA_DMA_START;
+ writeb(dmactl, mmio + ATA_DMA_CMD);
+ }
+
+ return sata_sff_hardreset(link, class, deadline);
+}
+
+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 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 __iomem *mmio = ap->ioaddr.bmdma_addr;
+
+ /* load PRD table addr. */
+ mb(); /* make sure PRD table writes are visible to controller */
+ writel(ap->bmdma_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->sff_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 lock)
+ */
+
+static void k2_bmdma_start_mmio(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ void __iomem *mmio = 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);
+ /* This works around possible data corruption.
+
+ On 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->sff_exec_command(ap, &qc->tf);
+}
+
+
+static u8 k2_stat_check_status(struct ata_port *ap)
+{
+ return readl(ap->ioaddr.status_addr);
+}
+
+static int k2_sata_show_info(struct seq_file *m, struct Scsi_Host *shost)
+{
+ struct ata_port *ap;
+ struct device_node *np;
+ int 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->dev));
+ if (np == NULL)
+ return 0;
+
+ /* Match it to a port node */
+ index = (ap == ap->host->ports[0]) ? 0 : 1;
+ for (np = np->child; np != NULL; np = np->sibling) {
+ const u32 *reg = of_get_property(np, "reg", NULL);
+ if (!reg)
+ continue;
+ if (index == *reg) {
+ seq_printf(m, "devspec: %s\n", np->full_name);
+ break;
+ }
+ }
+ return 0;
+}
+
+static struct scsi_host_template k2_sata_sht = {
+ ATA_BMDMA_SHT(DRV_NAME),
+ .show_info = k2_sata_show_info,
+};
+
+
+static struct ata_port_operations k2_sata_ops = {
+ .inherits = &ata_bmdma_port_ops,
+ .softreset = k2_sata_softreset,
+ .hardreset = k2_sata_hardreset,
+ .sff_tf_load = k2_sata_tf_load,
+ .sff_tf_read = k2_sata_tf_read,
+ .sff_check_status = k2_stat_check_status,
+ .check_atapi_dma = k2_sata_check_atapi_dma,
+ .bmdma_setup = k2_bmdma_setup_mmio,
+ .bmdma_start = k2_bmdma_start_mmio,
+ .scr_read = k2_sata_scr_read,
+ .scr_write = k2_sata_scr_write,
+};
+
+static const struct ata_port_info k2_port_info[] = {
+ /* chip_svw4 */
+ {
+ .flags = ATA_FLAG_SATA | K2_FLAG_NO_ATAPI_DMA,
+ .pio_mask = ATA_PIO4,
+ .mwdma_mask = ATA_MWDMA2,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &k2_sata_ops,
+ },
+ /* chip_svw8 */
+ {
+ .flags = ATA_FLAG_SATA | K2_FLAG_NO_ATAPI_DMA |
+ K2_FLAG_SATA_8_PORTS,
+ .pio_mask = ATA_PIO4,
+ .mwdma_mask = ATA_MWDMA2,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &k2_sata_ops,
+ },
+ /* chip_svw42 */
+ {
+ .flags = ATA_FLAG_SATA | K2_FLAG_BAR_POS_3,
+ .pio_mask = ATA_PIO4,
+ .mwdma_mask = ATA_MWDMA2,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &k2_sata_ops,
+ },
+ /* chip_svw43 */
+ {
+ .flags = ATA_FLAG_SATA,
+ .pio_mask = ATA_PIO4,
+ .mwdma_mask = ATA_MWDMA2,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &k2_sata_ops,
+ },
+};
+
+static void k2_sata_setup_port(struct ata_ioports *port, void __iomem *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)
+{
+ const struct ata_port_info *ppi[] =
+ { &k2_port_info[ent->driver_data], NULL };
+ struct ata_host *host;
+ void __iomem *mmio_base;
+ int n_ports, i, rc, bar_pos;
+
+ ata_print_version_once(&pdev->dev, DRV_VERSION);
+
+ /* allocate host */
+ n_ports = 4;
+ if (ppi[0]->flags & K2_FLAG_SATA_8_PORTS)
+ n_ports = 8;
+
+ host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
+ if (!host)
+ return -ENOMEM;
+
+ bar_pos = 5;
+ if (ppi[0]->flags & K2_FLAG_BAR_POS_3)
+ bar_pos = 3;
+ /*
+ * 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 = pcim_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, bar_pos) == 0) {
+ /* In IDE mode we need to pin the device to ensure that
+ pcim_release does not clear the busmaster bit in config
+ space, clearing causes busmaster DMA to fail on
+ ports 3 & 4 */
+ pcim_pin_device(pdev);
+ return -ENODEV;
+ }
+
+ /* Request and iomap PCI regions */
+ rc = pcim_iomap_regions(pdev, 1 << bar_pos, DRV_NAME);
+ if (rc == -EBUSY)
+ pcim_pin_device(pdev);
+ if (rc)
+ return rc;
+ host->iomap = pcim_iomap_table(pdev);
+ mmio_base = host->iomap[bar_pos];
+
+ /* 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 < host->n_ports; i++) {
+ struct ata_port *ap = host->ports[i];
+ unsigned int offset = i * K2_SATA_PORT_OFFSET;
+
+ k2_sata_setup_port(&ap->ioaddr, mmio_base + offset);
+
+ ata_port_pbar_desc(ap, 5, -1, "mmio");
+ ata_port_pbar_desc(ap, 5, offset, "port");
+ }
+
+ rc = dma_set_mask(&pdev->dev, ATA_DMA_MASK);
+ if (rc)
+ return rc;
+ rc = dma_set_coherent_mask(&pdev->dev, ATA_DMA_MASK);
+ if (rc)
+ return rc;
+
+ /* 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);
+
+ pci_set_master(pdev);
+ return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
+ IRQF_SHARED, &k2_sata_sht);
+}
+
+/* 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[] = {
+ { PCI_VDEVICE(SERVERWORKS, 0x0240), chip_svw4 },
+ { PCI_VDEVICE(SERVERWORKS, 0x0241), chip_svw8 },
+ { PCI_VDEVICE(SERVERWORKS, 0x0242), chip_svw4 },
+ { PCI_VDEVICE(SERVERWORKS, 0x024a), chip_svw4 },
+ { PCI_VDEVICE(SERVERWORKS, 0x024b), chip_svw4 },
+ { PCI_VDEVICE(SERVERWORKS, 0x0410), chip_svw42 },
+ { PCI_VDEVICE(SERVERWORKS, 0x0411), chip_svw43 },
+
+ { }
+};
+
+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,
+};
+
+module_pci_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);
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