1 /* 2 * Atari Falcon PATA controller driver 3 * 4 * Copyright (c) 2016 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com 6 * 7 * Based on falconide.c: 8 * 9 * Created 12 Jul 1997 by Geert Uytterhoeven 10 * 11 * This file is subject to the terms and conditions of the GNU General Public 12 * License. See the file "COPYING" in the main directory of this archive 13 * for more details. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/blkdev.h> 20 #include <linux/delay.h> 21 #include <scsi/scsi_host.h> 22 #include <scsi/scsi_cmnd.h> 23 #include <linux/ata.h> 24 #include <linux/libata.h> 25 #include <linux/mm.h> 26 #include <linux/interrupt.h> 27 #include <linux/platform_device.h> 28 29 #include <asm/setup.h> 30 #include <asm/atarihw.h> 31 #include <asm/atariints.h> 32 #include <asm/atari_stdma.h> 33 #include <asm/ide.h> 34 35 #define DRV_NAME "pata_falcon" 36 #define DRV_VERSION "0.1.0" 37 38 #define ATA_HD_BASE 0xfff00000 39 #define ATA_HD_CONTROL 0x39 40 41 static struct scsi_host_template pata_falcon_sht = { 42 ATA_PIO_SHT(DRV_NAME), 43 }; 44 45 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, 46 unsigned char *buf, 47 unsigned int buflen, int rw) 48 { 49 struct ata_device *dev = qc->dev; 50 struct ata_port *ap = dev->link->ap; 51 void __iomem *data_addr = ap->ioaddr.data_addr; 52 unsigned int words = buflen >> 1; 53 struct scsi_cmnd *cmd = qc->scsicmd; 54 bool swap = 1; 55 56 if (dev->class == ATA_DEV_ATA && cmd && cmd->request && 57 !blk_rq_is_passthrough(cmd->request)) 58 swap = 0; 59 60 /* Transfer multiple of 2 bytes */ 61 if (rw == READ) { 62 if (swap) 63 raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words); 64 else 65 raw_insw((u16 *)data_addr, (u16 *)buf, words); 66 } else { 67 if (swap) 68 raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words); 69 else 70 raw_outsw((u16 *)data_addr, (u16 *)buf, words); 71 } 72 73 /* Transfer trailing byte, if any. */ 74 if (unlikely(buflen & 0x01)) { 75 unsigned char pad[2] = { }; 76 77 /* Point buf to the tail of buffer */ 78 buf += buflen - 1; 79 80 if (rw == READ) { 81 if (swap) 82 raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1); 83 else 84 raw_insw((u16 *)data_addr, (u16 *)pad, 1); 85 *buf = pad[0]; 86 } else { 87 pad[0] = *buf; 88 if (swap) 89 raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1); 90 else 91 raw_outsw((u16 *)data_addr, (u16 *)pad, 1); 92 } 93 words++; 94 } 95 96 return words << 1; 97 } 98 99 /* 100 * Provide our own set_mode() as we don't want to change anything that has 101 * already been configured.. 102 */ 103 static int pata_falcon_set_mode(struct ata_link *link, 104 struct ata_device **unused) 105 { 106 struct ata_device *dev; 107 108 ata_for_each_dev(dev, link, ENABLED) { 109 /* We don't really care */ 110 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 111 dev->xfer_shift = ATA_SHIFT_PIO; 112 dev->flags |= ATA_DFLAG_PIO; 113 ata_dev_info(dev, "configured for PIO\n"); 114 } 115 return 0; 116 } 117 118 static struct ata_port_operations pata_falcon_ops = { 119 .inherits = &ata_sff_port_ops, 120 .sff_data_xfer = pata_falcon_data_xfer, 121 .cable_detect = ata_cable_unknown, 122 .set_mode = pata_falcon_set_mode, 123 }; 124 125 static int pata_falcon_init_one(void) 126 { 127 struct ata_host *host; 128 struct ata_port *ap; 129 struct platform_device *pdev; 130 void __iomem *base; 131 132 if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE)) 133 return -ENODEV; 134 135 pr_info(DRV_NAME ": Atari Falcon PATA controller\n"); 136 137 pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0); 138 if (IS_ERR(pdev)) 139 return PTR_ERR(pdev); 140 141 if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) { 142 pr_err(DRV_NAME ": resources busy\n"); 143 return -EBUSY; 144 } 145 146 /* allocate host */ 147 host = ata_host_alloc(&pdev->dev, 1); 148 if (!host) 149 return -ENOMEM; 150 ap = host->ports[0]; 151 152 ap->ops = &pata_falcon_ops; 153 ap->pio_mask = ATA_PIO4; 154 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 155 ap->flags |= ATA_FLAG_PIO_POLLING; 156 157 base = (void __iomem *)ATA_HD_BASE; 158 ap->ioaddr.data_addr = base; 159 ap->ioaddr.error_addr = base + 1 + 1 * 4; 160 ap->ioaddr.feature_addr = base + 1 + 1 * 4; 161 ap->ioaddr.nsect_addr = base + 1 + 2 * 4; 162 ap->ioaddr.lbal_addr = base + 1 + 3 * 4; 163 ap->ioaddr.lbam_addr = base + 1 + 4 * 4; 164 ap->ioaddr.lbah_addr = base + 1 + 5 * 4; 165 ap->ioaddr.device_addr = base + 1 + 6 * 4; 166 ap->ioaddr.status_addr = base + 1 + 7 * 4; 167 ap->ioaddr.command_addr = base + 1 + 7 * 4; 168 169 ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL; 170 ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL; 171 172 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base, 173 (unsigned long)base + ATA_HD_CONTROL); 174 175 /* activate */ 176 return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht); 177 } 178 179 module_init(pata_falcon_init_one); 180 181 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); 182 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); 183 MODULE_LICENSE("GPL"); 184 MODULE_VERSION(DRV_VERSION); 185