258 lines
6.7 KiB
C
258 lines
6.7 KiB
C
/*
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* ixp4xx PATA/Compact Flash driver
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* Copyright (C) 2006-07 Tower Technologies
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* An ATA driver to handle a Compact Flash connected
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* to the ixp4xx expansion bus in TrueIDE mode. The CF
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* must have it chip selects connected to two CS lines
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* on the ixp4xx. In the irq is not available, you might
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* want to modify both this driver and libata to run in
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* polling mode.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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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/libata.h>
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#include <linux/irq.h>
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#include <linux/platform_device.h>
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#include <scsi/scsi_host.h>
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#define DRV_NAME "pata_ixp4xx_cf"
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#define DRV_VERSION "0.2"
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static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
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{
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struct ata_device *dev;
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ata_link_for_each_dev(dev, link) {
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if (ata_dev_enabled(dev)) {
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ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
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dev->pio_mode = XFER_PIO_0;
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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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}
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}
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return 0;
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}
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static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
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unsigned int buflen, int write_data)
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{
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unsigned int i;
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unsigned int words = buflen >> 1;
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u16 *buf16 = (u16 *) buf;
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struct ata_port *ap = adev->link->ap;
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void __iomem *mmio = ap->ioaddr.data_addr;
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struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
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/* set the expansion bus in 16bit mode and restore
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* 8 bit mode after the transaction.
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*/
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*data->cs0_cfg &= ~(0x01);
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udelay(100);
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/* Transfer multiple of 2 bytes */
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if (write_data) {
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for (i = 0; i < words; i++)
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writew(buf16[i], mmio);
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} else {
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for (i = 0; i < words; i++)
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buf16[i] = readw(mmio);
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}
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/* Transfer trailing 1 byte, if any. */
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if (unlikely(buflen & 0x01)) {
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u16 align_buf[1] = { 0 };
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unsigned char *trailing_buf = buf + buflen - 1;
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if (write_data) {
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memcpy(align_buf, trailing_buf, 1);
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writew(align_buf[0], mmio);
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} else {
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align_buf[0] = readw(mmio);
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memcpy(trailing_buf, align_buf, 1);
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}
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}
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udelay(100);
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*data->cs0_cfg |= 0x01;
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}
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static struct scsi_host_template ixp4xx_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 ixp4xx_port_ops = {
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.set_mode = ixp4xx_set_mode,
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.mode_filter = ata_pci_default_filter,
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.tf_load = ata_tf_load,
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.tf_read = ata_tf_read,
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.exec_command = ata_exec_command,
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.check_status = ata_check_status,
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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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.qc_prep = ata_qc_prep,
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.qc_issue = ata_qc_issue_prot,
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.data_xfer = ixp4xx_mmio_data_xfer,
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.cable_detect = ata_cable_40wire,
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.irq_handler = ata_interrupt,
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.irq_clear = ata_bmdma_irq_clear,
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.irq_on = ata_irq_on,
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.port_start = ata_port_start,
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};
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static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
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struct ixp4xx_pata_data *data,
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unsigned long raw_cs0, unsigned long raw_cs1)
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{
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unsigned long raw_cmd = raw_cs0;
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unsigned long raw_ctl = raw_cs1 + 0x06;
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ioaddr->cmd_addr = data->cs0;
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ioaddr->altstatus_addr = data->cs1 + 0x06;
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ioaddr->ctl_addr = data->cs1 + 0x06;
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ata_std_ports(ioaddr);
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#ifndef __ARMEB__
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/* adjust the addresses to handle the address swizzling of the
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* ixp4xx in little endian mode.
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*/
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*(unsigned long *)&ioaddr->data_addr ^= 0x02;
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*(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
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*(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
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*(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
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*(unsigned long *)&ioaddr->error_addr ^= 0x03;
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*(unsigned long *)&ioaddr->feature_addr ^= 0x03;
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*(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
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*(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
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*(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
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*(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
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*(unsigned long *)&ioaddr->device_addr ^= 0x03;
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*(unsigned long *)&ioaddr->status_addr ^= 0x03;
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*(unsigned long *)&ioaddr->command_addr ^= 0x03;
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raw_cmd ^= 0x03;
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raw_ctl ^= 0x03;
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#endif
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ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
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}
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static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
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{
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unsigned int irq;
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struct resource *cs0, *cs1;
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struct ata_host *host;
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struct ata_port *ap;
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struct ixp4xx_pata_data *data = pdev->dev.platform_data;
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cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!cs0 || !cs1)
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return -EINVAL;
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/* allocate host */
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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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/* acquire resources and fill host */
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pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
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data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
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data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
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if (!data->cs0 || !data->cs1)
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return -ENOMEM;
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irq = platform_get_irq(pdev, 0);
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if (irq)
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set_irq_type(irq, IRQT_RISING);
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/* Setup expansion bus chip selects */
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*data->cs0_cfg = data->cs0_bits;
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*data->cs1_cfg = data->cs1_bits;
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ap = host->ports[0];
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ap->ops = &ixp4xx_port_ops;
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ap->pio_mask = 0x1f; /* PIO4 */
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ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
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ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
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dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
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/* activate host */
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return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
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}
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static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
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{
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struct ata_host *host = platform_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 ixp4xx_pata_platform_driver = {
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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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.probe = ixp4xx_pata_probe,
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.remove = __devexit_p(ixp4xx_pata_remove),
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};
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static int __init ixp4xx_pata_init(void)
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{
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return platform_driver_register(&ixp4xx_pata_platform_driver);
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}
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static void __exit ixp4xx_pata_exit(void)
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{
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platform_driver_unregister(&ixp4xx_pata_platform_driver);
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}
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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module_init(ixp4xx_pata_init);
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module_exit(ixp4xx_pata_exit);
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