diff options
Diffstat (limited to 'drivers/ata/pata_falcon.c')
| -rw-r--r-- | drivers/ata/pata_falcon.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/ata/pata_falcon.c b/drivers/ata/pata_falcon.c new file mode 100644 index 000000000000..5b0c57d1c59f --- /dev/null +++ b/drivers/ata/pata_falcon.c @@ -0,0 +1,184 @@ +/* + * Atari Falcon PATA controller driver + * + * Copyright (c) 2016 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Based on falconide.c: + * + * Created 12 Jul 1997 by Geert Uytterhoeven + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/blkdev.h> +#include <linux/delay.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_cmnd.h> +#include <linux/ata.h> +#include <linux/libata.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> + +#include <asm/setup.h> +#include <asm/atarihw.h> +#include <asm/atariints.h> +#include <asm/atari_stdma.h> +#include <asm/ide.h> + +#define DRV_NAME "pata_falcon" +#define DRV_VERSION "0.1.0" + +#define ATA_HD_BASE 0xfff00000 +#define ATA_HD_CONTROL 0x39 + +static struct scsi_host_template pata_falcon_sht = { + ATA_PIO_SHT(DRV_NAME), +}; + +static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, + unsigned char *buf, + unsigned int buflen, int rw) +{ + struct ata_device *dev = qc->dev; + struct ata_port *ap = dev->link->ap; + void __iomem *data_addr = ap->ioaddr.data_addr; + unsigned int words = buflen >> 1; + struct scsi_cmnd *cmd = qc->scsicmd; + bool swap = 1; + + if (dev->class == ATA_DEV_ATA && cmd && cmd->request && + !blk_rq_is_passthrough(cmd->request)) + swap = 0; + + /* Transfer multiple of 2 bytes */ + if (rw == READ) { + if (swap) + raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words); + else + raw_insw((u16 *)data_addr, (u16 *)buf, words); + } else { + if (swap) + raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words); + else + raw_outsw((u16 *)data_addr, (u16 *)buf, words); + } + + /* Transfer trailing byte, if any. */ + if (unlikely(buflen & 0x01)) { + unsigned char pad[2] = { }; + + /* Point buf to the tail of buffer */ + buf += buflen - 1; + + if (rw == READ) { + if (swap) + raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1); + else + raw_insw((u16 *)data_addr, (u16 *)pad, 1); + *buf = pad[0]; + } else { + pad[0] = *buf; + if (swap) + raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1); + else + raw_outsw((u16 *)data_addr, (u16 *)pad, 1); + } + words++; + } + + return words << 1; +} + +/* + * Provide our own set_mode() as we don't want to change anything that has + * already been configured.. + */ +static int pata_falcon_set_mode(struct ata_link *link, + struct ata_device **unused) +{ + struct ata_device *dev; + + ata_for_each_dev(dev, link, ENABLED) { + /* We don't really care */ + dev->pio_mode = dev->xfer_mode = XFER_PIO_0; + dev->xfer_shift = ATA_SHIFT_PIO; + dev->flags |= ATA_DFLAG_PIO; + ata_dev_info(dev, "configured for PIO\n"); + } + return 0; +} + +static struct ata_port_operations pata_falcon_ops = { + .inherits = &ata_sff_port_ops, + .sff_data_xfer = pata_falcon_data_xfer, + .cable_detect = ata_cable_unknown, + .set_mode = pata_falcon_set_mode, +}; + +static int pata_falcon_init_one(void) +{ + struct ata_host *host; + struct ata_port *ap; + struct platform_device *pdev; + void __iomem *base; + + if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE)) + return -ENODEV; + + pr_info(DRV_NAME ": Atari Falcon PATA controller\n"); + + pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) { + pr_err(DRV_NAME ": resources busy\n"); + return -EBUSY; + } + + /* allocate host */ + host = ata_host_alloc(&pdev->dev, 1); + if (!host) + return -ENOMEM; + ap = host->ports[0]; + + ap->ops = &pata_falcon_ops; + ap->pio_mask = ATA_PIO4; + ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; + ap->flags |= ATA_FLAG_PIO_POLLING; + + base = (void __iomem *)ATA_HD_BASE; + ap->ioaddr.data_addr = base; + ap->ioaddr.error_addr = base + 1 + 1 * 4; + ap->ioaddr.feature_addr = base + 1 + 1 * 4; + ap->ioaddr.nsect_addr = base + 1 + 2 * 4; + ap->ioaddr.lbal_addr = base + 1 + 3 * 4; + ap->ioaddr.lbam_addr = base + 1 + 4 * 4; + ap->ioaddr.lbah_addr = base + 1 + 5 * 4; + ap->ioaddr.device_addr = base + 1 + 6 * 4; + ap->ioaddr.status_addr = base + 1 + 7 * 4; + ap->ioaddr.command_addr = base + 1 + 7 * 4; + + ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL; + ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL; + + ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base, + (unsigned long)base + ATA_HD_CONTROL); + + /* activate */ + return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht); +} + +module_init(pata_falcon_init_one); + +MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); +MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); |