diff options
Diffstat (limited to 'drivers/ata/pata_ixp4xx_cf.c')
| -rw-r--r-- | drivers/ata/pata_ixp4xx_cf.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/ata/pata_ixp4xx_cf.c b/drivers/ata/pata_ixp4xx_cf.c new file mode 100644 index 000000000..abda44183 --- /dev/null +++ b/drivers/ata/pata_ixp4xx_cf.c @@ -0,0 +1,207 @@ +/* + * 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_for_each_dev(dev, link, ENABLED) { + ata_dev_info(dev, "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 = dev_get_platdata(ap->host->dev); + + /* 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 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 = dev_get_platdata(&pdev->dev); + int ret; + + 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 */ + ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + 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) + irq_set_irq_type(irq, IRQ_TYPE_EDGE_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 = ATA_PIO4; + ap->flags |= ATA_FLAG_NO_ATAPI; + + ixp4xx_setup_port(ap, data, cs0->start, cs1->start); + + ata_print_version_once(&pdev->dev, DRV_VERSION); + + /* activate host */ + return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht); +} + +static struct platform_driver ixp4xx_pata_platform_driver = { + .driver = { + .name = DRV_NAME, + }, + .probe = ixp4xx_pata_probe, + .remove = ata_platform_remove_one, +}; + +module_platform_driver(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); |