1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * Atari Falcon PATA controller driver 5 * 6 * Copyright (c) 2016 Samsung Electronics Co., Ltd. 7 * http://www.samsung.com 8 * 9 * Based on falconide.c: 10 * 11 * Created 12 Jul 1997 by Geert Uytterhoeven 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/blkdev.h> 18 #include <linux/delay.h> 19 #include <scsi/scsi_host.h> 20 #include <scsi/scsi_cmnd.h> 21 #include <linux/ata.h> 22 #include <linux/libata.h> 23 #include <linux/mm.h> 24 #include <linux/interrupt.h> 25 #include <linux/platform_device.h> 26 27 #include <asm/setup.h> 28 #include <asm/atarihw.h> 29 #include <asm/atariints.h> 30 #include <asm/atari_stdma.h> 31 #include <asm/ide.h> 32 33 #define DRV_NAME "pata_falcon" 34 #define DRV_VERSION "0.1.0" 35 36 #define ATA_HD_CONTROL 0x39 37 38 static struct scsi_host_template pata_falcon_sht = { 39 ATA_PIO_SHT(DRV_NAME), 40 }; 41 42 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, 43 unsigned char *buf, 44 unsigned int buflen, int rw) 45 { 46 struct ata_device *dev = qc->dev; 47 struct ata_port *ap = dev->link->ap; 48 void __iomem *data_addr = ap->ioaddr.data_addr; 49 unsigned int words = buflen >> 1; 50 struct scsi_cmnd *cmd = qc->scsicmd; 51 bool swap = 1; 52 53 if (dev->class == ATA_DEV_ATA && cmd && cmd->request && 54 !blk_rq_is_passthrough(cmd->request)) 55 swap = 0; 56 57 /* Transfer multiple of 2 bytes */ 58 if (rw == READ) { 59 if (swap) 60 raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words); 61 else 62 raw_insw((u16 *)data_addr, (u16 *)buf, words); 63 } else { 64 if (swap) 65 raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words); 66 else 67 raw_outsw((u16 *)data_addr, (u16 *)buf, words); 68 } 69 70 /* Transfer trailing byte, if any. */ 71 if (unlikely(buflen & 0x01)) { 72 unsigned char pad[2] = { }; 73 74 /* Point buf to the tail of buffer */ 75 buf += buflen - 1; 76 77 if (rw == READ) { 78 if (swap) 79 raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1); 80 else 81 raw_insw((u16 *)data_addr, (u16 *)pad, 1); 82 *buf = pad[0]; 83 } else { 84 pad[0] = *buf; 85 if (swap) 86 raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1); 87 else 88 raw_outsw((u16 *)data_addr, (u16 *)pad, 1); 89 } 90 words++; 91 } 92 93 return words << 1; 94 } 95 96 /* 97 * Provide our own set_mode() as we don't want to change anything that has 98 * already been configured.. 99 */ 100 static int pata_falcon_set_mode(struct ata_link *link, 101 struct ata_device **unused) 102 { 103 struct ata_device *dev; 104 105 ata_for_each_dev(dev, link, ENABLED) { 106 /* We don't really care */ 107 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 108 dev->xfer_shift = ATA_SHIFT_PIO; 109 dev->flags |= ATA_DFLAG_PIO; 110 ata_dev_info(dev, "configured for PIO\n"); 111 } 112 return 0; 113 } 114 115 static struct ata_port_operations pata_falcon_ops = { 116 .inherits = &ata_sff_port_ops, 117 .sff_data_xfer = pata_falcon_data_xfer, 118 .cable_detect = ata_cable_unknown, 119 .set_mode = pata_falcon_set_mode, 120 }; 121 122 static int __init pata_falcon_init_one(struct platform_device *pdev) 123 { 124 struct resource *res; 125 struct ata_host *host; 126 struct ata_port *ap; 127 void __iomem *base; 128 129 dev_info(&pdev->dev, "Atari Falcon PATA controller\n"); 130 131 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 132 if (!res) 133 return -ENODEV; 134 135 if (!devm_request_mem_region(&pdev->dev, res->start, 136 resource_size(res), DRV_NAME)) { 137 dev_err(&pdev->dev, "resources busy\n"); 138 return -EBUSY; 139 } 140 141 /* allocate host */ 142 host = ata_host_alloc(&pdev->dev, 1); 143 if (!host) 144 return -ENOMEM; 145 ap = host->ports[0]; 146 147 ap->ops = &pata_falcon_ops; 148 ap->pio_mask = ATA_PIO4; 149 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 150 ap->flags |= ATA_FLAG_PIO_POLLING; 151 152 base = (void __iomem *)res->start; 153 ap->ioaddr.data_addr = base; 154 ap->ioaddr.error_addr = base + 1 + 1 * 4; 155 ap->ioaddr.feature_addr = base + 1 + 1 * 4; 156 ap->ioaddr.nsect_addr = base + 1 + 2 * 4; 157 ap->ioaddr.lbal_addr = base + 1 + 3 * 4; 158 ap->ioaddr.lbam_addr = base + 1 + 4 * 4; 159 ap->ioaddr.lbah_addr = base + 1 + 5 * 4; 160 ap->ioaddr.device_addr = base + 1 + 6 * 4; 161 ap->ioaddr.status_addr = base + 1 + 7 * 4; 162 ap->ioaddr.command_addr = base + 1 + 7 * 4; 163 164 ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL; 165 ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL; 166 167 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base, 168 (unsigned long)base + ATA_HD_CONTROL); 169 170 /* activate */ 171 return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht); 172 } 173 174 static int __exit pata_falcon_remove_one(struct platform_device *pdev) 175 { 176 struct ata_host *host = platform_get_drvdata(pdev); 177 178 ata_host_detach(host); 179 180 return 0; 181 } 182 183 static struct platform_driver pata_falcon_driver = { 184 .remove = __exit_p(pata_falcon_remove_one), 185 .driver = { 186 .name = "atari-falcon-ide", 187 }, 188 }; 189 190 module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one); 191 192 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); 193 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); 194 MODULE_LICENSE("GPL v2"); 195 MODULE_ALIAS("platform:atari-falcon-ide"); 196 MODULE_VERSION(DRV_VERSION); 197