265 lines
7.1 KiB
C
265 lines
7.1 KiB
C
/*
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* Generic platform device PATA driver
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*
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* Copyright (C) 2006 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 <alan@redhat.com>, 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/init.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/pata_platform.h>
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#define DRV_NAME "pata_platform"
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#define DRV_VERSION "1.0"
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static int pio_mask = 1;
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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_port *ap, struct ata_device **unused)
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{
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int i;
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for (i = 0; i < ATA_MAX_DEVICES; i++) {
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struct ata_device *dev = &ap->device[i];
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if (ata_dev_enabled(dev)) {
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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_printk(dev, KERN_INFO, "configured for PIO\n");
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}
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}
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return 0;
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}
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static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
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static struct scsi_host_template pata_platform_sht = {
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.module = THIS_MODULE,
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.name = DRV_NAME,
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.ioctl = ata_scsi_ioctl,
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.queuecommand = ata_scsi_queuecmd,
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.can_queue = ATA_DEF_QUEUE,
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.this_id = ATA_SHT_THIS_ID,
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.sg_tablesize = LIBATA_MAX_PRD,
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.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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.emulated = ATA_SHT_EMULATED,
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.use_clustering = ATA_SHT_USE_CLUSTERING,
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.proc_name = DRV_NAME,
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.dma_boundary = ATA_DMA_BOUNDARY,
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.slave_configure = ata_scsi_slave_config,
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.slave_destroy = ata_scsi_slave_destroy,
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.bios_param = ata_std_bios_param,
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};
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static struct ata_port_operations pata_platform_port_ops = {
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.set_mode = pata_platform_set_mode,
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.port_disable = ata_port_disable,
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.tf_load = ata_tf_load,
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.tf_read = ata_tf_read,
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.check_status = ata_check_status,
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.exec_command = ata_exec_command,
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.dev_select = ata_std_dev_select,
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.freeze = ata_bmdma_freeze,
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.thaw = ata_bmdma_thaw,
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.error_handler = ata_bmdma_error_handler,
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.post_internal_cmd = ata_bmdma_post_internal_cmd,
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.cable_detect = ata_cable_unknown,
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.qc_prep = ata_qc_prep,
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.qc_issue = ata_qc_issue_prot,
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.data_xfer = ata_data_xfer_noirq,
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.irq_clear = ata_bmdma_irq_clear,
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.irq_on = ata_irq_on,
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.irq_ack = ata_irq_ack,
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.port_start = ata_dummy_ret0,
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};
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static void pata_platform_setup_port(struct ata_ioports *ioaddr,
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struct pata_platform_info *info)
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{
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unsigned int shift = 0;
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/* Fixup the port shift for platforms that need it */
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if (info && info->ioport_shift)
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shift = info->ioport_shift;
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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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* @pdev: platform device
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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 3 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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* - 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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static int __devinit pata_platform_probe(struct platform_device *pdev)
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{
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struct resource *io_res, *ctl_res;
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struct ata_host *host;
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struct ata_port *ap;
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struct pata_platform_info *pp_info;
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unsigned int mmio;
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/*
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* Simple resource validation ..
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*/
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if (unlikely(pdev->num_resources != 3)) {
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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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* 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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* Now that that's out of the way, wire up the port..
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*/
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host = ata_host_alloc(&pdev->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 = &pata_platform_port_ops;
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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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* Handle the MMIO case
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*/
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if (mmio) {
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ap->ioaddr.cmd_addr = devm_ioremap(&pdev->dev, io_res->start,
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io_res->end - io_res->start + 1);
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ap->ioaddr.ctl_addr = devm_ioremap(&pdev->dev, ctl_res->start,
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ctl_res->end - ctl_res->start + 1);
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} else {
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ap->ioaddr.cmd_addr = devm_ioport_map(&pdev->dev, io_res->start,
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io_res->end - io_res->start + 1);
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ap->ioaddr.ctl_addr = devm_ioport_map(&pdev->dev, ctl_res->start,
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ctl_res->end - ctl_res->start + 1);
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}
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if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
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dev_err(&pdev->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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pp_info = (struct pata_platform_info *)(pdev->dev.platform_data);
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pata_platform_setup_port(&ap->ioaddr, pp_info);
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/* activate */
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return ata_host_activate(host, platform_get_irq(pdev, 0),
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ata_interrupt, pp_info ? pp_info->irq_flags
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: 0, &pata_platform_sht);
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}
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/**
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* pata_platform_remove - unplug a platform interface
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* @pdev: platform device
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*
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* A platform bus ATA device has been unplugged. Perform the needed
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* cleanup. Also called on module unload for any active devices.
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*/
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static int __devexit pata_platform_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ata_host *host = dev_get_drvdata(dev);
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ata_host_detach(host);
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return 0;
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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 = __devexit_p(pata_platform_remove),
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init pata_platform_init(void)
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{
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return platform_driver_register(&pata_platform_driver);
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}
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static void __exit pata_platform_exit(void)
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{
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platform_driver_unregister(&pata_platform_driver);
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}
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module_init(pata_platform_init);
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module_exit(pata_platform_exit);
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module_param(pio_mask, int, 0);
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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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