// SPDX-License-Identifier: GPL-2.0 /* * 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 */ #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_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 __init pata_falcon_init_one(struct platform_device *pdev) { struct resource *res; struct ata_host *host; struct ata_port *ap; void __iomem *base; dev_info(&pdev->dev, "Atari Falcon PATA controller\n"); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res), DRV_NAME)) { dev_err(&pdev->dev, "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 *)res->start; 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); } static int __exit pata_falcon_remove_one(struct platform_device *pdev) { struct ata_host *host = platform_get_drvdata(pdev); ata_host_detach(host); return 0; } static struct platform_driver pata_falcon_driver = { .remove = __exit_p(pata_falcon_remove_one), .driver = { .name = "atari-falcon-ide", }, }; module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one); MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:atari-falcon-ide"); MODULE_VERSION(DRV_VERSION);