diff options
Diffstat (limited to 'kernel/drivers/ata/pata_platform.c')
| -rw-r--r-- | kernel/drivers/ata/pata_platform.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/kernel/drivers/ata/pata_platform.c b/kernel/drivers/ata/pata_platform.c new file mode 100644 index 000000000..c503ded87 --- /dev/null +++ b/kernel/drivers/ata/pata_platform.c @@ -0,0 +1,240 @@ +/* + * Generic platform device PATA driver + * + * Copyright (C) 2006 - 2007 Paul Mundt + * + * Based on pata_pcmcia: + * + * Copyright 2005-2006 Red Hat Inc, all rights reserved. + * + * 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/blkdev.h> +#include <scsi/scsi_host.h> +#include <linux/ata.h> +#include <linux/libata.h> +#include <linux/platform_device.h> +#include <linux/ata_platform.h> + +#define DRV_NAME "pata_platform" +#define DRV_VERSION "1.2" + +static int pio_mask = 1; + +/* + * Provide our own set_mode() as we don't want to change anything that has + * already been configured.. + */ +static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused) +{ + struct ata_device *dev; + + ata_for_each_dev(dev, link, ENABLED) { + /* We don't really care */ + dev->pio_mode = dev->xfer_mode = XFER_PIO_0; + dev->xfer_shift = ATA_SHIFT_PIO; + dev->flags |= ATA_DFLAG_PIO; + ata_dev_info(dev, "configured for PIO\n"); + } + return 0; +} + +static struct scsi_host_template pata_platform_sht = { + ATA_PIO_SHT(DRV_NAME), +}; + +static struct ata_port_operations pata_platform_port_ops = { + .inherits = &ata_sff_port_ops, + .sff_data_xfer = ata_sff_data_xfer_noirq, + .cable_detect = ata_cable_unknown, + .set_mode = pata_platform_set_mode, +}; + +static void pata_platform_setup_port(struct ata_ioports *ioaddr, + unsigned int shift) +{ + /* Fixup the port shift for platforms that need it */ + ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); + ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); + ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); + ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); + ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); + ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); + ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); + ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); + ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); + ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); +} + +/** + * __pata_platform_probe - attach a platform interface + * @dev: device + * @io_res: Resource representing I/O base + * @ctl_res: Resource representing CTL base + * @irq_res: Resource representing IRQ and its flags + * @ioport_shift: I/O port shift + * @__pio_mask: PIO mask + * @sht: scsi_host_template to use when registering + * + * Register a platform bus IDE interface. Such interfaces are PIO and we + * assume do not support IRQ sharing. + * + * Platform devices are expected to contain at least 2 resources per port: + * + * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) + * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) + * + * and optionally: + * + * - IRQ (IORESOURCE_IRQ) + * + * If the base resources are both mem types, the ioremap() is handled + * here. For IORESOURCE_IO, it's assumed that there's no remapping + * necessary. + * + * If no IRQ resource is present, PIO polling mode is used instead. + */ +int __pata_platform_probe(struct device *dev, struct resource *io_res, + struct resource *ctl_res, struct resource *irq_res, + unsigned int ioport_shift, int __pio_mask, + struct scsi_host_template *sht) +{ + struct ata_host *host; + struct ata_port *ap; + unsigned int mmio; + int irq = 0; + int irq_flags = 0; + + /* + * Check for MMIO + */ + mmio = (( io_res->flags == IORESOURCE_MEM) && + (ctl_res->flags == IORESOURCE_MEM)); + + /* + * And the IRQ + */ + if (irq_res && irq_res->start > 0) { + irq = irq_res->start; + irq_flags = irq_res->flags & IRQF_TRIGGER_MASK; + } + + /* + * Now that that's out of the way, wire up the port.. + */ + host = ata_host_alloc(dev, 1); + if (!host) + return -ENOMEM; + ap = host->ports[0]; + + ap->ops = &pata_platform_port_ops; + ap->pio_mask = __pio_mask; + ap->flags |= ATA_FLAG_SLAVE_POSS; + + /* + * Use polling mode if there's no IRQ + */ + if (!irq) { + ap->flags |= ATA_FLAG_PIO_POLLING; + ata_port_desc(ap, "no IRQ, using PIO polling"); + } + + /* + * Handle the MMIO case + */ + if (mmio) { + ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start, + resource_size(io_res)); + ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start, + resource_size(ctl_res)); + } else { + ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start, + resource_size(io_res)); + ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start, + resource_size(ctl_res)); + } + if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { + dev_err(dev, "failed to map IO/CTL base\n"); + return -ENOMEM; + } + + ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; + + pata_platform_setup_port(&ap->ioaddr, ioport_shift); + + ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport", + (unsigned long long)io_res->start, + (unsigned long long)ctl_res->start); + + /* activate */ + return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, + irq_flags, sht); +} +EXPORT_SYMBOL_GPL(__pata_platform_probe); + +static int pata_platform_probe(struct platform_device *pdev) +{ + struct resource *io_res; + struct resource *ctl_res; + struct resource *irq_res; + struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev); + + /* + * Simple resource validation .. + */ + if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) { + dev_err(&pdev->dev, "invalid number of resources\n"); + return -EINVAL; + } + + /* + * Get the I/O base first + */ + io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); + if (io_res == NULL) { + io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (unlikely(io_res == NULL)) + return -EINVAL; + } + + /* + * Then the CTL base + */ + ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); + if (ctl_res == NULL) { + ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (unlikely(ctl_res == NULL)) + return -EINVAL; + } + + /* + * And the IRQ + */ + irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + + return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res, + pp_info ? pp_info->ioport_shift : 0, + pio_mask, &pata_platform_sht); +} + +static struct platform_driver pata_platform_driver = { + .probe = pata_platform_probe, + .remove = ata_platform_remove_one, + .driver = { + .name = DRV_NAME, + }, +}; + +module_platform_driver(pata_platform_driver); + +module_param(pio_mask, int, 0); + +MODULE_AUTHOR("Paul Mundt"); +MODULE_DESCRIPTION("low-level driver for platform device ATA"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); +MODULE_ALIAS("platform:" DRV_NAME); |