/* * 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 unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev, unsigned char *buf, unsigned int buflen, int rw) { unsigned int i; unsigned int words = buflen >> 1; u16 *buf16 = (u16 *) buf; struct ata_port *ap = dev->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 (rw == READ) for (i = 0; i < words; i++) buf16[i] = readw(mmio); else for (i = 0; i < words; i++) writew(buf16[i], mmio); /* Transfer trailing 1 byte, if any. */ if (unlikely(buflen & 0x01)) { u16 align_buf[1] = { 0 }; unsigned char *trailing_buf = buf + buflen - 1; if (rw == READ) { align_buf[0] = readw(mmio); memcpy(trailing_buf, align_buf, 1); } else { memcpy(align_buf, trailing_buf, 1); writew(align_buf[0], mmio); } words++; } udelay(100); *data->cs0_cfg |= 0x01; return words << 1; } static struct scsi_host_template ixp4xx_sht = { ATA_PIO_SHT(DRV_NAME), }; static struct ata_port_operations ixp4xx_port_ops = { .inherits = &ata_sff_port_ops, .sff_data_xfer = ixp4xx_mmio_data_xfer, .cable_detect = ata_cable_40wire, .set_mode = ixp4xx_set_mode, }; static void ixp4xx_setup_port(struct ata_port *ap, struct ixp4xx_pata_data *data, unsigned long raw_cs0, unsigned long raw_cs1) { struct ata_ioports *ioaddr = &ap->ioaddr; 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_sff_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_sff_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_ALIAS("platform:" DRV_NAME); module_init(ixp4xx_pata_init); module_exit(ixp4xx_pata_exit);