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_BASE 0xfff00000 37 #define ATA_HD_CONTROL 0x39 38 39 static struct scsi_host_template pata_falcon_sht = { 40 ATA_PIO_SHT(DRV_NAME), 41 }; 42 43 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, 44 unsigned char *buf, 45 unsigned int buflen, int rw) 46 { 47 struct ata_device *dev = qc->dev; 48 struct ata_port *ap = dev->link->ap; 49 void __iomem *data_addr = ap->ioaddr.data_addr; 50 unsigned int words = buflen >> 1; 51 struct scsi_cmnd *cmd = qc->scsicmd; 52 bool swap = 1; 53 54 if (dev->class == ATA_DEV_ATA && cmd && cmd->request && 55 !blk_rq_is_passthrough(cmd->request)) 56 swap = 0; 57 58 /* Transfer multiple of 2 bytes */ 59 if (rw == READ) { 60 if (swap) 61 raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words); 62 else 63 raw_insw((u16 *)data_addr, (u16 *)buf, words); 64 } else { 65 if (swap) 66 raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words); 67 else 68 raw_outsw((u16 *)data_addr, (u16 *)buf, words); 69 } 70 71 /* Transfer trailing byte, if any. */ 72 if (unlikely(buflen & 0x01)) { 73 unsigned char pad[2] = { }; 74 75 /* Point buf to the tail of buffer */ 76 buf += buflen - 1; 77 78 if (rw == READ) { 79 if (swap) 80 raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1); 81 else 82 raw_insw((u16 *)data_addr, (u16 *)pad, 1); 83 *buf = pad[0]; 84 } else { 85 pad[0] = *buf; 86 if (swap) 87 raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1); 88 else 89 raw_outsw((u16 *)data_addr, (u16 *)pad, 1); 90 } 91 words++; 92 } 93 94 return words << 1; 95 } 96 97 /* 98 * Provide our own set_mode() as we don't want to change anything that has 99 * already been configured.. 100 */ 101 static int pata_falcon_set_mode(struct ata_link *link, 102 struct ata_device **unused) 103 { 104 struct ata_device *dev; 105 106 ata_for_each_dev(dev, link, ENABLED) { 107 /* We don't really care */ 108 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 109 dev->xfer_shift = ATA_SHIFT_PIO; 110 dev->flags |= ATA_DFLAG_PIO; 111 ata_dev_info(dev, "configured for PIO\n"); 112 } 113 return 0; 114 } 115 116 static struct ata_port_operations pata_falcon_ops = { 117 .inherits = &ata_sff_port_ops, 118 .sff_data_xfer = pata_falcon_data_xfer, 119 .cable_detect = ata_cable_unknown, 120 .set_mode = pata_falcon_set_mode, 121 }; 122 123 static int pata_falcon_init_one(void) 124 { 125 struct ata_host *host; 126 struct ata_port *ap; 127 struct platform_device *pdev; 128 void __iomem *base; 129 130 if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE)) 131 return -ENODEV; 132 133 pr_info(DRV_NAME ": Atari Falcon PATA controller\n"); 134 135 pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0); 136 if (IS_ERR(pdev)) 137 return PTR_ERR(pdev); 138 139 if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) { 140 pr_err(DRV_NAME ": resources busy\n"); 141 return -EBUSY; 142 } 143 144 /* allocate host */ 145 host = ata_host_alloc(&pdev->dev, 1); 146 if (!host) 147 return -ENOMEM; 148 ap = host->ports[0]; 149 150 ap->ops = &pata_falcon_ops; 151 ap->pio_mask = ATA_PIO4; 152 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 153 ap->flags |= ATA_FLAG_PIO_POLLING; 154 155 base = (void __iomem *)ATA_HD_BASE; 156 ap->ioaddr.data_addr = base; 157 ap->ioaddr.error_addr = base + 1 + 1 * 4; 158 ap->ioaddr.feature_addr = base + 1 + 1 * 4; 159 ap->ioaddr.nsect_addr = base + 1 + 2 * 4; 160 ap->ioaddr.lbal_addr = base + 1 + 3 * 4; 161 ap->ioaddr.lbam_addr = base + 1 + 4 * 4; 162 ap->ioaddr.lbah_addr = base + 1 + 5 * 4; 163 ap->ioaddr.device_addr = base + 1 + 6 * 4; 164 ap->ioaddr.status_addr = base + 1 + 7 * 4; 165 ap->ioaddr.command_addr = base + 1 + 7 * 4; 166 167 ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL; 168 ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL; 169 170 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base, 171 (unsigned long)base + ATA_HD_CONTROL); 172 173 /* activate */ 174 return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht); 175 } 176 177 module_init(pata_falcon_init_one); 178 179 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); 180 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); 181 MODULE_LICENSE("GPL v2"); 182 MODULE_VERSION(DRV_VERSION); 183