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24dc5f33ea
Update libata LLDs to use devres. Core layer is already converted to
support managed LLDs. This patch simplifies initialization and fixes
many resource related bugs in init failure and detach path. For
example, all converted drivers now handle ata_device_add() failure
gracefully without excessive resource rollback code.
As most resources are released automatically on driver detach, many
drivers don't need or can do with much simpler ->{port|host}_stop().
In general, stop callbacks are need iff port or host needs to be given
commands to shut it down. Note that freezing is enough in many cases
and ports are automatically frozen before being detached.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
262 lines
6.4 KiB
C
262 lines
6.4 KiB
C
/*
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* ixp4xx PATA/Compact Flash driver
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* Copyright (c) 2006 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. The interrupt line is optional, if not
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* specified the driver will run in 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 "0.1.1ac1"
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static int ixp4xx_set_mode(struct ata_port *ap, struct ata_device *adev)
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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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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_phy_reset(struct ata_port *ap)
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{
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ap->cbl = ATA_CBL_PATA40;
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ata_port_probe(ap);
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ata_bus_reset(ap);
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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->ap;
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void __iomem *mmio = (void __iomem *)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 void ixp4xx_irq_clear(struct ata_port *ap)
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{
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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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.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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.qc_prep = ata_qc_prep,
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.qc_issue = ata_qc_issue_prot,
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.eng_timeout = ata_eng_timeout,
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.data_xfer = ixp4xx_mmio_data_xfer,
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.irq_handler = ata_interrupt,
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.irq_clear = ixp4xx_irq_clear,
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.port_start = ata_port_start,
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.phy_reset = ixp4xx_phy_reset,
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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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{
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ioaddr->cmd_addr = (unsigned long) data->cs0;
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ioaddr->altstatus_addr = (unsigned long) data->cs1 + 0x06;
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ioaddr->ctl_addr = (unsigned long) 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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ioaddr->data_addr ^= 0x02;
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ioaddr->cmd_addr ^= 0x03;
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ioaddr->altstatus_addr ^= 0x03;
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ioaddr->ctl_addr ^= 0x03;
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ioaddr->error_addr ^= 0x03;
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ioaddr->feature_addr ^= 0x03;
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ioaddr->nsect_addr ^= 0x03;
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ioaddr->lbal_addr ^= 0x03;
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ioaddr->lbam_addr ^= 0x03;
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ioaddr->lbah_addr ^= 0x03;
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ioaddr->device_addr ^= 0x03;
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ioaddr->status_addr ^= 0x03;
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ioaddr->command_addr ^= 0x03;
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#endif
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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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int ret;
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unsigned int irq;
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struct resource *cs0, *cs1;
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struct ata_probe_ent ae;
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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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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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irq = platform_get_irq(pdev, 0);
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if (irq)
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set_irq_type(irq, IRQT_HIGH);
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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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memset(&ae, 0, sizeof(struct ata_probe_ent));
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INIT_LIST_HEAD(&ae.node);
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ae.dev = &pdev->dev;
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ae.port_ops = &ixp4xx_port_ops;
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ae.sht = &ixp4xx_sht;
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ae.n_ports = 1;
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ae.pio_mask = 0x1f; /* PIO4 */
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ae.irq = irq;
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ae.irq_flags = 0;
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ae.port_flags = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
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| ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
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/* run in polling mode if no irq has been assigned */
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if (!irq)
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ae.port_flags |= ATA_FLAG_PIO_POLLING;
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ixp4xx_setup_port(&ae.port[0], data);
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dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
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ret = ata_device_add(&ae);
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if (ret == 0)
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return -ENODEV;
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return 0;
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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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platform_set_drvdata(dev, NULL);
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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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