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