243 lines
6.7 KiB
C
243 lines
6.7 KiB
C
/*
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* Generic platform device PATA driver
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*
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* Copyright (C) 2006 - 2007 Paul Mundt
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*
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* Based on pata_pcmcia:
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*
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* Copyright 2005-2006 Red Hat Inc, all rights reserved.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <scsi/scsi_host.h>
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#include <linux/ata.h>
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#include <linux/libata.h>
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#include <linux/platform_device.h>
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#include <linux/ata_platform.h>
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#define DRV_NAME "pata_platform"
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#define DRV_VERSION "1.2"
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static int pio_mask = 1;
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module_param(pio_mask, int, 0);
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MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default");
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/*
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* Provide our own set_mode() as we don't want to change anything that has
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* already been configured..
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*/
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static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
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{
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struct ata_device *dev;
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ata_for_each_dev(dev, link, ENABLED) {
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/* We don't really care */
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dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
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dev->xfer_shift = ATA_SHIFT_PIO;
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dev->flags |= ATA_DFLAG_PIO;
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ata_dev_info(dev, "configured for PIO\n");
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}
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return 0;
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}
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static struct scsi_host_template pata_platform_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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static void pata_platform_setup_port(struct ata_ioports *ioaddr,
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unsigned int shift)
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{
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/* Fixup the port shift for platforms that need it */
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ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
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ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
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ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
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ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
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ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
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ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
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ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
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ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
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ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
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ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
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}
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/**
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* __pata_platform_probe - attach a platform interface
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* @dev: device
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* @io_res: Resource representing I/O base
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* @ctl_res: Resource representing CTL base
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* @irq_res: Resource representing IRQ and its flags
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* @ioport_shift: I/O port shift
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* @__pio_mask: PIO mask
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* @sht: scsi_host_template to use when registering
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* @use16bit: Flag to indicate 16-bit IO instead of 32-bit
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*
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* Register a platform bus IDE interface. Such interfaces are PIO and we
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* assume do not support IRQ sharing.
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*
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* Platform devices are expected to contain at least 2 resources per port:
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*
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* - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
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* - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
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*
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* and optionally:
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*
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* - IRQ (IORESOURCE_IRQ)
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*
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* If the base resources are both mem types, the ioremap() is handled
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* here. For IORESOURCE_IO, it's assumed that there's no remapping
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* necessary.
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*
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* If no IRQ resource is present, PIO polling mode is used instead.
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*/
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int __pata_platform_probe(struct device *dev, struct resource *io_res,
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struct resource *ctl_res, struct resource *irq_res,
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unsigned int ioport_shift, int __pio_mask,
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struct scsi_host_template *sht, bool use16bit)
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{
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struct ata_host *host;
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struct ata_port *ap;
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unsigned int mmio;
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int irq = 0;
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int irq_flags = 0;
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/*
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* Check for MMIO
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*/
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mmio = (( io_res->flags == IORESOURCE_MEM) &&
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(ctl_res->flags == IORESOURCE_MEM));
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/*
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* And the IRQ
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*/
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if (irq_res && irq_res->start > 0) {
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irq = irq_res->start;
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irq_flags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
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}
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/*
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* Now that that's out of the way, wire up the port..
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*/
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host = ata_host_alloc(dev, 1);
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if (!host)
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return -ENOMEM;
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ap = host->ports[0];
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ap->ops = devm_kzalloc(dev, sizeof(*ap->ops), GFP_KERNEL);
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ap->ops->inherits = &ata_sff_port_ops;
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ap->ops->cable_detect = ata_cable_unknown;
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ap->ops->set_mode = pata_platform_set_mode;
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if (use16bit)
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ap->ops->sff_data_xfer = ata_sff_data_xfer;
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else
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ap->ops->sff_data_xfer = ata_sff_data_xfer32;
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ap->pio_mask = __pio_mask;
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ap->flags |= ATA_FLAG_SLAVE_POSS;
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/*
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* Use polling mode if there's no IRQ
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*/
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if (!irq) {
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ap->flags |= ATA_FLAG_PIO_POLLING;
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ata_port_desc(ap, "no IRQ, using PIO polling");
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}
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/*
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* Handle the MMIO case
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*/
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if (mmio) {
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ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
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resource_size(io_res));
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ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
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resource_size(ctl_res));
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} else {
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ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
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resource_size(io_res));
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ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
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resource_size(ctl_res));
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}
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if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
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dev_err(dev, "failed to map IO/CTL base\n");
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return -ENOMEM;
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}
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ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
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pata_platform_setup_port(&ap->ioaddr, ioport_shift);
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ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
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(unsigned long long)io_res->start,
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(unsigned long long)ctl_res->start);
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/* activate */
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return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
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irq_flags, sht);
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}
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EXPORT_SYMBOL_GPL(__pata_platform_probe);
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static int pata_platform_probe(struct platform_device *pdev)
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{
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struct resource *io_res;
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struct resource *ctl_res;
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struct resource *irq_res;
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struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
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/*
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* Simple resource validation ..
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*/
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if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
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dev_err(&pdev->dev, "invalid number of resources\n");
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return -EINVAL;
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}
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/*
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* Get the I/O base first
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*/
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io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (io_res == NULL) {
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io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (unlikely(io_res == NULL))
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return -EINVAL;
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}
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/*
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* Then the CTL base
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*/
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ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
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if (ctl_res == NULL) {
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ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (unlikely(ctl_res == NULL))
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return -EINVAL;
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}
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/*
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* And the IRQ
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*/
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irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
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pp_info ? pp_info->ioport_shift : 0,
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pio_mask, &pata_platform_sht, false);
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}
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static struct platform_driver pata_platform_driver = {
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.probe = pata_platform_probe,
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.remove = ata_platform_remove_one,
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.driver = {
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.name = DRV_NAME,
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},
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};
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module_platform_driver(pata_platform_driver);
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MODULE_AUTHOR("Paul Mundt");
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MODULE_DESCRIPTION("low-level driver for platform device ATA");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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MODULE_ALIAS("platform:" DRV_NAME);
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