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 static struct scsi_host_template pata_falcon_sht = { 37 ATA_PIO_SHT(DRV_NAME), 38 }; 39 40 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, 41 unsigned char *buf, 42 unsigned int buflen, int rw) 43 { 44 struct ata_device *dev = qc->dev; 45 struct ata_port *ap = dev->link->ap; 46 void __iomem *data_addr = ap->ioaddr.data_addr; 47 unsigned int words = buflen >> 1; 48 struct scsi_cmnd *cmd = qc->scsicmd; 49 bool swap = 1; 50 51 if (dev->class == ATA_DEV_ATA && cmd && 52 !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd))) 53 swap = 0; 54 55 /* Transfer multiple of 2 bytes */ 56 if (rw == READ) { 57 if (swap) 58 raw_insw_swapw(data_addr, (u16 *)buf, words); 59 else 60 raw_insw(data_addr, (u16 *)buf, words); 61 } else { 62 if (swap) 63 raw_outsw_swapw(data_addr, (u16 *)buf, words); 64 else 65 raw_outsw(data_addr, (u16 *)buf, words); 66 } 67 68 /* Transfer trailing byte, if any. */ 69 if (unlikely(buflen & 0x01)) { 70 unsigned char pad[2] = { }; 71 72 /* Point buf to the tail of buffer */ 73 buf += buflen - 1; 74 75 if (rw == READ) { 76 if (swap) 77 raw_insw_swapw(data_addr, (u16 *)pad, 1); 78 else 79 raw_insw(data_addr, (u16 *)pad, 1); 80 *buf = pad[0]; 81 } else { 82 pad[0] = *buf; 83 if (swap) 84 raw_outsw_swapw(data_addr, (u16 *)pad, 1); 85 else 86 raw_outsw(data_addr, (u16 *)pad, 1); 87 } 88 words++; 89 } 90 91 return words << 1; 92 } 93 94 /* 95 * Provide our own set_mode() as we don't want to change anything that has 96 * already been configured.. 97 */ 98 static int pata_falcon_set_mode(struct ata_link *link, 99 struct ata_device **unused) 100 { 101 struct ata_device *dev; 102 103 ata_for_each_dev(dev, link, ENABLED) { 104 /* We don't really care */ 105 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 106 dev->xfer_shift = ATA_SHIFT_PIO; 107 dev->flags |= ATA_DFLAG_PIO; 108 ata_dev_info(dev, "configured for PIO\n"); 109 } 110 return 0; 111 } 112 113 static struct ata_port_operations pata_falcon_ops = { 114 .inherits = &ata_sff_port_ops, 115 .sff_data_xfer = pata_falcon_data_xfer, 116 .cable_detect = ata_cable_unknown, 117 .set_mode = pata_falcon_set_mode, 118 }; 119 120 static int __init pata_falcon_init_one(struct platform_device *pdev) 121 { 122 struct resource *base_mem_res, *ctl_mem_res; 123 struct resource *base_res, *ctl_res, *irq_res; 124 struct ata_host *host; 125 struct ata_port *ap; 126 void __iomem *base; 127 int irq = 0; 128 129 dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n"); 130 131 base_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 132 if (base_res && !devm_request_region(&pdev->dev, base_res->start, 133 resource_size(base_res), DRV_NAME)) { 134 dev_err(&pdev->dev, "resources busy\n"); 135 return -EBUSY; 136 } 137 138 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 139 if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start, 140 resource_size(ctl_res), DRV_NAME)) { 141 dev_err(&pdev->dev, "resources busy\n"); 142 return -EBUSY; 143 } 144 145 base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 146 if (!base_mem_res) 147 return -ENODEV; 148 if (!devm_request_mem_region(&pdev->dev, base_mem_res->start, 149 resource_size(base_mem_res), DRV_NAME)) { 150 dev_err(&pdev->dev, "resources busy\n"); 151 return -EBUSY; 152 } 153 154 ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 155 if (!ctl_mem_res) 156 return -ENODEV; 157 158 /* allocate host */ 159 host = ata_host_alloc(&pdev->dev, 1); 160 if (!host) 161 return -ENOMEM; 162 ap = host->ports[0]; 163 164 ap->ops = &pata_falcon_ops; 165 ap->pio_mask = ATA_PIO4; 166 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 167 168 base = (void __iomem *)base_mem_res->start; 169 /* N.B. this assumes data_addr will be used for word-sized I/O only */ 170 ap->ioaddr.data_addr = base + 0 + 0 * 4; 171 ap->ioaddr.error_addr = base + 1 + 1 * 4; 172 ap->ioaddr.feature_addr = base + 1 + 1 * 4; 173 ap->ioaddr.nsect_addr = base + 1 + 2 * 4; 174 ap->ioaddr.lbal_addr = base + 1 + 3 * 4; 175 ap->ioaddr.lbam_addr = base + 1 + 4 * 4; 176 ap->ioaddr.lbah_addr = base + 1 + 5 * 4; 177 ap->ioaddr.device_addr = base + 1 + 6 * 4; 178 ap->ioaddr.status_addr = base + 1 + 7 * 4; 179 ap->ioaddr.command_addr = base + 1 + 7 * 4; 180 181 base = (void __iomem *)ctl_mem_res->start; 182 ap->ioaddr.altstatus_addr = base + 1; 183 ap->ioaddr.ctl_addr = base + 1; 184 185 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", 186 (unsigned long)base_mem_res->start, 187 (unsigned long)ctl_mem_res->start); 188 189 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 190 if (irq_res && irq_res->start > 0) { 191 irq = irq_res->start; 192 } else { 193 ap->flags |= ATA_FLAG_PIO_POLLING; 194 ata_port_desc(ap, "no IRQ, using PIO polling"); 195 } 196 197 /* activate */ 198 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, 199 IRQF_SHARED, &pata_falcon_sht); 200 } 201 202 static int __exit pata_falcon_remove_one(struct platform_device *pdev) 203 { 204 struct ata_host *host = platform_get_drvdata(pdev); 205 206 ata_host_detach(host); 207 208 return 0; 209 } 210 211 static struct platform_driver pata_falcon_driver = { 212 .remove = __exit_p(pata_falcon_remove_one), 213 .driver = { 214 .name = "atari-falcon-ide", 215 }, 216 }; 217 218 module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one); 219 220 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); 221 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); 222 MODULE_LICENSE("GPL v2"); 223 MODULE_ALIAS("platform:atari-falcon-ide"); 224 MODULE_VERSION(DRV_VERSION); 225