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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 | // 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" 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 && !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd))) 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 *base_mem_res, *ctl_mem_res; struct resource *base_res, *ctl_res, *irq_res; struct ata_host *host; struct ata_port *ap; void __iomem *base; int irq = 0; dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n"); base_res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (base_res && !devm_request_region(&pdev->dev, base_res->start, resource_size(base_res), DRV_NAME)) { dev_err(&pdev->dev, "resources busy\n"); return -EBUSY; } ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start, resource_size(ctl_res), DRV_NAME)) { dev_err(&pdev->dev, "resources busy\n"); return -EBUSY; } base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!base_mem_res) return -ENODEV; if (!devm_request_mem_region(&pdev->dev, base_mem_res->start, resource_size(base_mem_res), DRV_NAME)) { dev_err(&pdev->dev, "resources busy\n"); return -EBUSY; } ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (!ctl_mem_res) return -ENODEV; /* 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; base = (void __iomem *)base_mem_res->start; /* N.B. this assumes data_addr will be used for word-sized I/O only */ ap->ioaddr.data_addr = base + 0 + 0 * 4; 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; base = (void __iomem *)ctl_mem_res->start; ap->ioaddr.altstatus_addr = base + 1; ap->ioaddr.ctl_addr = base + 1; ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base_mem_res->start, (unsigned long)ctl_mem_res->start); irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (irq_res && irq_res->start > 0) { irq = irq_res->start; } else { ap->flags |= ATA_FLAG_PIO_POLLING; ata_port_desc(ap, "no IRQ, using PIO polling"); } /* activate */ return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, IRQF_SHARED, &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); |