diff options
Diffstat (limited to 'drivers/ata/pata_qdi.c')
-rw-r--r-- | drivers/ata/pata_qdi.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/drivers/ata/pata_qdi.c b/drivers/ata/pata_qdi.c new file mode 100644 index 0000000..3080f37 --- /dev/null +++ b/drivers/ata/pata_qdi.c @@ -0,0 +1,366 @@ +/* + * pata_qdi.c - QDI VLB ATA controllers + * (C) 2006 Red Hat + * + * This driver mostly exists as a proof of concept for non PCI devices under + * libata. While the QDI6580 was 'neat' in 1993 it is no longer terribly + * useful. + * + * Tuning code written from the documentation at + * http://www.ryston.cz/petr/vlb/qd6500.html + * http://www.ryston.cz/petr/vlb/qd6580.html + * + * Probe code based on drivers/ide/legacy/qd65xx.c + * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by + * Samuel Thibault <samuel.thibault@fnac.net> + */ + +#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 <scsi/scsi_host.h> +#include <linux/libata.h> +#include <linux/platform_device.h> + +#define DRV_NAME "pata_qdi" +#define DRV_VERSION "0.3.1" + +#define NR_HOST 4 /* Two 6580s */ + +struct qdi_data { + unsigned long timing; + u8 clock[2]; + u8 last; + int fast; + struct platform_device *platform_dev; + +}; + +static struct ata_host *qdi_host[NR_HOST]; +static struct qdi_data qdi_data[NR_HOST]; +static int nr_qdi_host; + +#ifdef MODULE +static int probe_qdi = 1; +#else +static int probe_qdi; +#endif + +static void qdi6500_set_piomode(struct ata_port *ap, struct ata_device *adev) +{ + struct ata_timing t; + struct qdi_data *qdi = ap->host->private_data; + int active, recovery; + u8 timing; + + /* Get the timing data in cycles */ + ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000); + + if (qdi->fast) { + active = 8 - clamp_val(t.active, 1, 8); + recovery = 18 - clamp_val(t.recover, 3, 18); + } else { + active = 9 - clamp_val(t.active, 2, 9); + recovery = 15 - clamp_val(t.recover, 0, 15); + } + timing = (recovery << 4) | active | 0x08; + + qdi->clock[adev->devno] = timing; + + outb(timing, qdi->timing); +} + +static void qdi6580_set_piomode(struct ata_port *ap, struct ata_device *adev) +{ + struct ata_timing t; + struct qdi_data *qdi = ap->host->private_data; + int active, recovery; + u8 timing; + + /* Get the timing data in cycles */ + ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000); + + if (qdi->fast) { + active = 8 - clamp_val(t.active, 1, 8); + recovery = 18 - clamp_val(t.recover, 3, 18); + } else { + active = 9 - clamp_val(t.active, 2, 9); + recovery = 15 - clamp_val(t.recover, 0, 15); + } + timing = (recovery << 4) | active | 0x08; + + qdi->clock[adev->devno] = timing; + + outb(timing, qdi->timing); + + /* Clear the FIFO */ + if (adev->class != ATA_DEV_ATA) + outb(0x5F, (qdi->timing & 0xFFF0) + 3); +} + +/** + * qdi_qc_issue - command issue + * @qc: command pending + * + * Called when the libata layer is about to issue a command. We wrap + * this interface so that we can load the correct ATA timings. + */ + +static unsigned int qdi_qc_issue(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + struct ata_device *adev = qc->dev; + struct qdi_data *qdi = ap->host->private_data; + + if (qdi->clock[adev->devno] != qdi->last) { + if (adev->pio_mode) { + qdi->last = qdi->clock[adev->devno]; + outb(qdi->clock[adev->devno], qdi->timing); + } + } + return ata_sff_qc_issue(qc); +} + +static unsigned int qdi_data_xfer(struct ata_device *dev, unsigned char *buf, + unsigned int buflen, int rw) +{ + if (ata_id_has_dword_io(dev->id)) { + struct ata_port *ap = dev->link->ap; + int slop = buflen & 3; + + 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 qdi_sht = { + ATA_PIO_SHT(DRV_NAME), +}; + +static struct ata_port_operations qdi6500_port_ops = { + .inherits = &ata_sff_port_ops, + .qc_issue = qdi_qc_issue, + .sff_data_xfer = qdi_data_xfer, + .cable_detect = ata_cable_40wire, + .set_piomode = qdi6500_set_piomode, +}; + +static struct ata_port_operations qdi6580_port_ops = { + .inherits = &qdi6500_port_ops, + .set_piomode = qdi6580_set_piomode, +}; + +/** + * qdi_init_one - attach a qdi interface + * @type: Type to display + * @io: I/O port start + * @irq: interrupt line + * @fast: True if on a > 33Mhz VLB + * + * Register an ISA bus IDE interface. Such interfaces are PIO and we + * assume do not support IRQ sharing. + */ + +static __init int qdi_init_one(unsigned long port, int type, unsigned long io, int irq, int fast) +{ + unsigned long ctl = io + 0x206; + struct platform_device *pdev; + struct ata_host *host; + struct ata_port *ap; + void __iomem *io_addr, *ctl_addr; + int ret; + + /* + * Fill in a probe structure first of all + */ + + pdev = platform_device_register_simple(DRV_NAME, nr_qdi_host, NULL, 0); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + ret = -ENOMEM; + io_addr = devm_ioport_map(&pdev->dev, io, 8); + ctl_addr = devm_ioport_map(&pdev->dev, ctl, 1); + if (!io_addr || !ctl_addr) + goto fail; + + ret = -ENOMEM; + host = ata_host_alloc(&pdev->dev, 1); + if (!host) + goto fail; + ap = host->ports[0]; + + if (type == 6580) { + ap->ops = &qdi6580_port_ops; + ap->pio_mask = 0x1F; + ap->flags |= ATA_FLAG_SLAVE_POSS; + } else { + ap->ops = &qdi6500_port_ops; + ap->pio_mask = 0x07; /* Actually PIO3 !IORDY is possible */ + ap->flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; + } + + ap->ioaddr.cmd_addr = io_addr; + ap->ioaddr.altstatus_addr = ctl_addr; + ap->ioaddr.ctl_addr = ctl_addr; + ata_sff_std_ports(&ap->ioaddr); + + ata_port_desc(ap, "cmd %lx ctl %lx", io, ctl); + + /* + * Hook in a private data structure per channel + */ + ap->private_data = &qdi_data[nr_qdi_host]; + + qdi_data[nr_qdi_host].timing = port; + qdi_data[nr_qdi_host].fast = fast; + qdi_data[nr_qdi_host].platform_dev = pdev; + + printk(KERN_INFO DRV_NAME": qd%d at 0x%lx.\n", type, io); + + /* activate */ + ret = ata_host_activate(host, irq, ata_sff_interrupt, 0, &qdi_sht); + if (ret) + goto fail; + + qdi_host[nr_qdi_host++] = dev_get_drvdata(&pdev->dev); + return 0; + + fail: + platform_device_unregister(pdev); + return ret; +} + +/** + * qdi_init - attach qdi interfaces + * + * Attach qdi IDE interfaces by scanning the ports it may occupy. + */ + +static __init int qdi_init(void) +{ + unsigned long flags; + static const unsigned long qd_port[2] = { 0x30, 0xB0 }; + static const unsigned long ide_port[2] = { 0x170, 0x1F0 }; + static const int ide_irq[2] = { 14, 15 }; + + int ct = 0; + int i; + + if (probe_qdi == 0) + return -ENODEV; + + /* + * Check each possible QD65xx base address + */ + + for (i = 0; i < 2; i++) { + unsigned long port = qd_port[i]; + u8 r, res; + + + if (request_region(port, 2, "pata_qdi")) { + /* Check for a card */ + local_irq_save(flags); + r = inb_p(port); + outb_p(0x19, port); + res = inb_p(port); + outb_p(r, port); + local_irq_restore(flags); + + /* Fail */ + if (res == 0x19) + { + release_region(port, 2); + continue; + } + + /* Passes the presence test */ + r = inb_p(port + 1); /* Check port agrees with port set */ + if ((r & 2) >> 1 != i) { + release_region(port, 2); + continue; + } + + /* Check card type */ + if ((r & 0xF0) == 0xC0) { + /* QD6500: single channel */ + if (r & 8) { + /* Disabled ? */ + release_region(port, 2); + continue; + } + if (qdi_init_one(port, 6500, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0) + ct++; + } + if (((r & 0xF0) == 0xA0) || (r & 0xF0) == 0x50) { + /* QD6580: dual channel */ + if (!request_region(port + 2 , 2, "pata_qdi")) + { + release_region(port, 2); + continue; + } + res = inb(port + 3); + if (res & 1) { + /* Single channel mode */ + if (qdi_init_one(port, 6580, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0) + ct++; + } else { + /* Dual channel mode */ + if (qdi_init_one(port, 6580, 0x1F0, 14, r & 0x04) == 0) + ct++; + if (qdi_init_one(port + 2, 6580, 0x170, 15, r & 0x04) == 0) + ct++; + } + } + } + } + if (ct != 0) + return 0; + return -ENODEV; +} + +static __exit void qdi_exit(void) +{ + int i; + + for (i = 0; i < nr_qdi_host; i++) { + ata_host_detach(qdi_host[i]); + /* Free the control resource. The 6580 dual channel has the resources + * claimed as a pair of 2 byte resources so we need no special cases... + */ + release_region(qdi_data[i].timing, 2); + platform_device_unregister(qdi_data[i].platform_dev); + } +} + +MODULE_AUTHOR("Alan Cox"); +MODULE_DESCRIPTION("low-level driver for qdi ATA"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); + +module_init(qdi_init); +module_exit(qdi_exit); + +module_param(probe_qdi, int, 0); + |