1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * Amiga Gayle PATA controller driver 5 * 6 * Copyright (c) 2018 Samsung Electronics Co., Ltd. 7 * http://www.samsung.com 8 * 9 * Based on gayle.c: 10 * 11 * Created 12 Jul 1997 by Geert Uytterhoeven 12 */ 13 14 #include <linux/ata.h> 15 #include <linux/blkdev.h> 16 #include <linux/delay.h> 17 #include <linux/interrupt.h> 18 #include <linux/kernel.h> 19 #include <linux/libata.h> 20 #include <linux/mm.h> 21 #include <linux/module.h> 22 #include <linux/platform_device.h> 23 #include <linux/zorro.h> 24 #include <scsi/scsi_cmnd.h> 25 #include <scsi/scsi_host.h> 26 27 #include <asm/amigahw.h> 28 #include <asm/amigaints.h> 29 #include <asm/amigayle.h> 30 #include <asm/ide.h> 31 #include <asm/setup.h> 32 33 #define DRV_NAME "pata_gayle" 34 #define DRV_VERSION "0.1.0" 35 36 #define GAYLE_CONTROL 0x101a 37 38 static struct scsi_host_template pata_gayle_sht = { 39 ATA_PIO_SHT(DRV_NAME), 40 }; 41 42 /* FIXME: is this needed? */ 43 static unsigned int pata_gayle_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 52 /* Transfer multiple of 2 bytes */ 53 if (rw == READ) 54 raw_insw((u16 *)data_addr, (u16 *)buf, words); 55 else 56 raw_outsw((u16 *)data_addr, (u16 *)buf, words); 57 58 /* Transfer trailing byte, if any. */ 59 if (unlikely(buflen & 0x01)) { 60 unsigned char pad[2] = { }; 61 62 /* Point buf to the tail of buffer */ 63 buf += buflen - 1; 64 65 if (rw == READ) { 66 raw_insw((u16 *)data_addr, (u16 *)pad, 1); 67 *buf = pad[0]; 68 } else { 69 pad[0] = *buf; 70 raw_outsw((u16 *)data_addr, (u16 *)pad, 1); 71 } 72 words++; 73 } 74 75 return words << 1; 76 } 77 78 /* 79 * Provide our own set_mode() as we don't want to change anything that has 80 * already been configured.. 81 */ 82 static int pata_gayle_set_mode(struct ata_link *link, 83 struct ata_device **unused) 84 { 85 struct ata_device *dev; 86 87 ata_for_each_dev(dev, link, ENABLED) { 88 /* We don't really care */ 89 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 90 dev->xfer_shift = ATA_SHIFT_PIO; 91 dev->flags |= ATA_DFLAG_PIO; 92 ata_dev_info(dev, "configured for PIO\n"); 93 } 94 return 0; 95 } 96 97 static bool pata_gayle_irq_check(struct ata_port *ap) 98 { 99 u8 ch; 100 101 ch = z_readb((unsigned long)ap->private_data); 102 103 return !!(ch & GAYLE_IRQ_IDE); 104 } 105 106 static void pata_gayle_irq_clear(struct ata_port *ap) 107 { 108 (void)z_readb((unsigned long)ap->ioaddr.status_addr); 109 z_writeb(0x7c, (unsigned long)ap->private_data); 110 } 111 112 static struct ata_port_operations pata_gayle_a1200_ops = { 113 .inherits = &ata_sff_port_ops, 114 .sff_data_xfer = pata_gayle_data_xfer, 115 .sff_irq_check = pata_gayle_irq_check, 116 .sff_irq_clear = pata_gayle_irq_clear, 117 .cable_detect = ata_cable_unknown, 118 .set_mode = pata_gayle_set_mode, 119 }; 120 121 static struct ata_port_operations pata_gayle_a4000_ops = { 122 .inherits = &ata_sff_port_ops, 123 .sff_data_xfer = pata_gayle_data_xfer, 124 .cable_detect = ata_cable_unknown, 125 .set_mode = pata_gayle_set_mode, 126 }; 127 128 static int __init pata_gayle_init_one(struct platform_device *pdev) 129 { 130 struct resource *res; 131 struct gayle_ide_platform_data *pdata; 132 struct ata_host *host; 133 struct ata_port *ap; 134 void __iomem *base; 135 int ret; 136 137 pdata = dev_get_platdata(&pdev->dev); 138 139 dev_info(&pdev->dev, "Amiga Gayle IDE controller (A%u style)\n", 140 pdata->explicit_ack ? 1200 : 4000); 141 142 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 143 if (!res) 144 return -ENODEV; 145 146 if (!devm_request_mem_region(&pdev->dev, res->start, 147 resource_size(res), DRV_NAME)) { 148 pr_err(DRV_NAME ": resources busy\n"); 149 return -EBUSY; 150 } 151 152 /* allocate host */ 153 host = ata_host_alloc(&pdev->dev, 1); 154 if (!host) 155 return -ENOMEM; 156 157 ap = host->ports[0]; 158 159 if (pdata->explicit_ack) 160 ap->ops = &pata_gayle_a1200_ops; 161 else 162 ap->ops = &pata_gayle_a4000_ops; 163 164 ap->pio_mask = ATA_PIO4; 165 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 166 167 base = ZTWO_VADDR(pdata->base); 168 ap->ioaddr.data_addr = base; 169 ap->ioaddr.error_addr = base + 2 + 1 * 4; 170 ap->ioaddr.feature_addr = base + 2 + 1 * 4; 171 ap->ioaddr.nsect_addr = base + 2 + 2 * 4; 172 ap->ioaddr.lbal_addr = base + 2 + 3 * 4; 173 ap->ioaddr.lbam_addr = base + 2 + 4 * 4; 174 ap->ioaddr.lbah_addr = base + 2 + 5 * 4; 175 ap->ioaddr.device_addr = base + 2 + 6 * 4; 176 ap->ioaddr.status_addr = base + 2 + 7 * 4; 177 ap->ioaddr.command_addr = base + 2 + 7 * 4; 178 179 ap->ioaddr.altstatus_addr = base + GAYLE_CONTROL; 180 ap->ioaddr.ctl_addr = base + GAYLE_CONTROL; 181 182 ap->private_data = (void *)ZTWO_VADDR(pdata->irqport); 183 184 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", pdata->base, 185 pdata->base + GAYLE_CONTROL); 186 187 ret = ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt, 188 IRQF_SHARED, &pata_gayle_sht); 189 if (ret) 190 return ret; 191 192 platform_set_drvdata(pdev, host); 193 194 return 0; 195 } 196 197 static int __exit pata_gayle_remove_one(struct platform_device *pdev) 198 { 199 struct ata_host *host = platform_get_drvdata(pdev); 200 201 ata_host_detach(host); 202 203 return 0; 204 } 205 206 static struct platform_driver pata_gayle_driver = { 207 .remove = __exit_p(pata_gayle_remove_one), 208 .driver = { 209 .name = "amiga-gayle-ide", 210 }, 211 }; 212 213 module_platform_driver_probe(pata_gayle_driver, pata_gayle_init_one); 214 215 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); 216 MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA"); 217 MODULE_LICENSE("GPL v2"); 218 MODULE_ALIAS("platform:amiga-gayle-ide"); 219 MODULE_VERSION(DRV_VERSION); 220