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 32 #define DRV_NAME "pata_falcon" 33 #define DRV_VERSION "0.1.0" 34 35 static int pata_falcon_swap_mask; 36 37 module_param_named(data_swab, pata_falcon_swap_mask, int, 0444); 38 MODULE_PARM_DESC(data_swab, "Data byte swap enable/disable bitmap (0x1==drive1, 0x2==drive2, 0x4==drive3, 0x8==drive4, default==0)"); 39 40 static const struct scsi_host_template pata_falcon_sht = { 41 ATA_PIO_SHT(DRV_NAME), 42 }; 43 44 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, 45 unsigned char *buf, 46 unsigned int buflen, int rw) 47 { 48 struct ata_device *dev = qc->dev; 49 struct ata_port *ap = dev->link->ap; 50 void __iomem *data_addr = ap->ioaddr.data_addr; 51 unsigned int words = buflen >> 1; 52 struct scsi_cmnd *cmd = qc->scsicmd; 53 bool swap = 1; 54 55 if (dev->class == ATA_DEV_ATA && cmd && 56 !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd))) 57 swap = (uintptr_t)ap->private_data & BIT(dev->devno); 58 59 /* Transfer multiple of 2 bytes */ 60 if (rw == READ) { 61 if (swap) 62 raw_insw_swapw(data_addr, (u16 *)buf, words); 63 else 64 raw_insw(data_addr, (u16 *)buf, words); 65 } else { 66 if (swap) 67 raw_outsw_swapw(data_addr, (u16 *)buf, words); 68 else 69 raw_outsw(data_addr, (u16 *)buf, words); 70 } 71 72 /* Transfer trailing byte, if any. */ 73 if (unlikely(buflen & 0x01)) { 74 unsigned char pad[2] = { }; 75 76 /* Point buf to the tail of buffer */ 77 buf += buflen - 1; 78 79 if (rw == READ) { 80 if (swap) 81 raw_insw_swapw(data_addr, (u16 *)pad, 1); 82 else 83 raw_insw(data_addr, (u16 *)pad, 1); 84 *buf = pad[0]; 85 } else { 86 pad[0] = *buf; 87 if (swap) 88 raw_outsw_swapw(data_addr, (u16 *)pad, 1); 89 else 90 raw_outsw(data_addr, (u16 *)pad, 1); 91 } 92 words++; 93 } 94 95 return words << 1; 96 } 97 98 /* 99 * Provide our own set_mode() as we don't want to change anything that has 100 * already been configured.. 101 */ 102 static int pata_falcon_set_mode(struct ata_link *link, 103 struct ata_device **unused) 104 { 105 struct ata_device *dev; 106 107 ata_for_each_dev(dev, link, ENABLED) { 108 /* We don't really care */ 109 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 110 dev->xfer_shift = ATA_SHIFT_PIO; 111 dev->flags |= ATA_DFLAG_PIO; 112 ata_dev_info(dev, "configured for PIO\n"); 113 } 114 return 0; 115 } 116 117 static struct ata_port_operations pata_falcon_ops = { 118 .inherits = &ata_sff_port_ops, 119 .sff_data_xfer = pata_falcon_data_xfer, 120 .cable_detect = ata_cable_unknown, 121 .set_mode = pata_falcon_set_mode, 122 }; 123 124 static int pata_falcon_init_one(struct platform_device *pdev) 125 { 126 struct resource *base_mem_res, *ctl_mem_res; 127 struct resource *base_res, *ctl_res, *irq_res; 128 struct ata_host *host; 129 struct ata_port *ap; 130 void __iomem *base, *ctl_base; 131 int mask_shift = 0; /* Q40 & Falcon default */ 132 int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */ 133 134 dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n"); 135 136 base_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 137 if (base_res && !devm_request_region(&pdev->dev, base_res->start, 138 resource_size(base_res), DRV_NAME)) { 139 dev_err(&pdev->dev, "resources busy\n"); 140 return -EBUSY; 141 } 142 143 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 144 if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start, 145 resource_size(ctl_res), DRV_NAME)) { 146 dev_err(&pdev->dev, "resources busy\n"); 147 return -EBUSY; 148 } 149 150 base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 151 if (!base_mem_res) 152 return -ENODEV; 153 if (!devm_request_mem_region(&pdev->dev, base_mem_res->start, 154 resource_size(base_mem_res), DRV_NAME)) { 155 dev_err(&pdev->dev, "resources busy\n"); 156 return -EBUSY; 157 } 158 159 ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 160 if (!ctl_mem_res) 161 return -ENODEV; 162 163 /* allocate host */ 164 host = ata_host_alloc(&pdev->dev, 1); 165 if (!host) 166 return -ENOMEM; 167 ap = host->ports[0]; 168 169 ap->ops = &pata_falcon_ops; 170 ap->pio_mask = ATA_PIO4; 171 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 172 173 /* N.B. this assumes data_addr will be used for word-sized I/O only */ 174 ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start; 175 176 if (base_res) { /* only Q40 has IO resources */ 177 io_offset = 0x10000; 178 reg_shift = 0; 179 base = (void __iomem *)base_res->start; 180 ctl_base = (void __iomem *)ctl_res->start; 181 } else { 182 base = (void __iomem *)base_mem_res->start; 183 ctl_base = (void __iomem *)ctl_mem_res->start; 184 } 185 186 ap->ioaddr.error_addr = base + io_offset + (1 << reg_shift); 187 ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift); 188 ap->ioaddr.nsect_addr = base + io_offset + (2 << reg_shift); 189 ap->ioaddr.lbal_addr = base + io_offset + (3 << reg_shift); 190 ap->ioaddr.lbam_addr = base + io_offset + (4 << reg_shift); 191 ap->ioaddr.lbah_addr = base + io_offset + (5 << reg_shift); 192 ap->ioaddr.device_addr = base + io_offset + (6 << reg_shift); 193 ap->ioaddr.status_addr = base + io_offset + (7 << reg_shift); 194 ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift); 195 196 ap->ioaddr.altstatus_addr = ctl_base + io_offset; 197 ap->ioaddr.ctl_addr = ctl_base + io_offset; 198 199 ata_port_desc(ap, "cmd %px ctl %px data %px", 200 base, ctl_base, ap->ioaddr.data_addr); 201 202 if (pdev->id > 0) 203 mask_shift = 2; 204 ap->private_data = (void *)(uintptr_t)(pata_falcon_swap_mask >> mask_shift); 205 206 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 207 if (irq_res && irq_res->start > 0) { 208 irq = irq_res->start; 209 } else { 210 ap->flags |= ATA_FLAG_PIO_POLLING; 211 ata_port_desc(ap, "no IRQ, using PIO polling"); 212 } 213 214 /* activate */ 215 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, 216 IRQF_SHARED, &pata_falcon_sht); 217 } 218 219 static void pata_falcon_remove_one(struct platform_device *pdev) 220 { 221 struct ata_host *host = platform_get_drvdata(pdev); 222 223 ata_host_detach(host); 224 } 225 226 static struct platform_driver pata_falcon_driver = { 227 .probe = pata_falcon_init_one, 228 .remove_new = pata_falcon_remove_one, 229 .driver = { 230 .name = "atari-falcon-ide", 231 }, 232 }; 233 234 module_platform_driver(pata_falcon_driver); 235 236 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); 237 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); 238 MODULE_LICENSE("GPL v2"); 239 MODULE_ALIAS("platform:atari-falcon-ide"); 240 MODULE_VERSION(DRV_VERSION); 241