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/setup.h> 31 32 #define DRV_NAME "pata_gayle" 33 #define DRV_VERSION "0.1.0" 34 35 #define GAYLE_CONTROL 0x101a 36 37 static const struct scsi_host_template pata_gayle_sht = { 38 ATA_PIO_SHT(DRV_NAME), 39 }; 40 41 /* FIXME: is this needed? */ 42 static unsigned int pata_gayle_data_xfer(struct ata_queued_cmd *qc, 43 unsigned char *buf, 44 unsigned int buflen, int rw) 45 { 46 struct ata_device *dev = qc->dev; 47 struct ata_port *ap = dev->link->ap; 48 void __iomem *data_addr = ap->ioaddr.data_addr; 49 unsigned int words = buflen >> 1; 50 51 /* Transfer multiple of 2 bytes */ 52 if (rw == READ) 53 raw_insw((u16 *)data_addr, (u16 *)buf, words); 54 else 55 raw_outsw((u16 *)data_addr, (u16 *)buf, words); 56 57 /* Transfer trailing byte, if any. */ 58 if (unlikely(buflen & 0x01)) { 59 unsigned char pad[2] = { }; 60 61 /* Point buf to the tail of buffer */ 62 buf += buflen - 1; 63 64 if (rw == READ) { 65 raw_insw((u16 *)data_addr, (u16 *)pad, 1); 66 *buf = pad[0]; 67 } else { 68 pad[0] = *buf; 69 raw_outsw((u16 *)data_addr, (u16 *)pad, 1); 70 } 71 words++; 72 } 73 74 return words << 1; 75 } 76 77 /* 78 * Provide our own set_mode() as we don't want to change anything that has 79 * already been configured.. 80 */ 81 static int pata_gayle_set_mode(struct ata_link *link, 82 struct ata_device **unused) 83 { 84 struct ata_device *dev; 85 86 ata_for_each_dev(dev, link, ENABLED) { 87 /* We don't really care */ 88 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 89 dev->xfer_shift = ATA_SHIFT_PIO; 90 dev->flags |= ATA_DFLAG_PIO; 91 ata_dev_info(dev, "configured for PIO\n"); 92 } 93 return 0; 94 } 95 96 static bool pata_gayle_irq_check(struct ata_port *ap) 97 { 98 u8 ch; 99 100 ch = z_readb((unsigned long)ap->private_data); 101 102 return !!(ch & GAYLE_IRQ_IDE); 103 } 104 105 static void pata_gayle_irq_clear(struct ata_port *ap) 106 { 107 (void)z_readb((unsigned long)ap->ioaddr.status_addr); 108 z_writeb(0x7c, (unsigned long)ap->private_data); 109 } 110 111 static struct ata_port_operations pata_gayle_a1200_ops = { 112 .inherits = &ata_sff_port_ops, 113 .sff_data_xfer = pata_gayle_data_xfer, 114 .sff_irq_check = pata_gayle_irq_check, 115 .sff_irq_clear = pata_gayle_irq_clear, 116 .cable_detect = ata_cable_unknown, 117 .set_mode = pata_gayle_set_mode, 118 }; 119 120 static struct ata_port_operations pata_gayle_a4000_ops = { 121 .inherits = &ata_sff_port_ops, 122 .sff_data_xfer = pata_gayle_data_xfer, 123 .cable_detect = ata_cable_unknown, 124 .set_mode = pata_gayle_set_mode, 125 }; 126 127 static int pata_gayle_init_one(struct platform_device *pdev) 128 { 129 struct resource *res; 130 struct gayle_ide_platform_data *pdata; 131 struct ata_host *host; 132 struct ata_port *ap; 133 void __iomem *base; 134 int ret; 135 136 pdata = dev_get_platdata(&pdev->dev); 137 138 dev_info(&pdev->dev, "Amiga Gayle IDE controller (A%u style)\n", 139 pdata->explicit_ack ? 1200 : 4000); 140 141 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 142 if (!res) 143 return -ENODEV; 144 145 if (!devm_request_mem_region(&pdev->dev, res->start, 146 resource_size(res), DRV_NAME)) { 147 pr_err(DRV_NAME ": resources busy\n"); 148 return -EBUSY; 149 } 150 151 /* allocate host */ 152 host = ata_host_alloc(&pdev->dev, 1); 153 if (!host) 154 return -ENOMEM; 155 156 ap = host->ports[0]; 157 158 if (pdata->explicit_ack) 159 ap->ops = &pata_gayle_a1200_ops; 160 else 161 ap->ops = &pata_gayle_a4000_ops; 162 163 ap->pio_mask = ATA_PIO4; 164 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 165 166 base = ZTWO_VADDR(pdata->base); 167 ap->ioaddr.data_addr = base; 168 ap->ioaddr.error_addr = base + 2 + 1 * 4; 169 ap->ioaddr.feature_addr = base + 2 + 1 * 4; 170 ap->ioaddr.nsect_addr = base + 2 + 2 * 4; 171 ap->ioaddr.lbal_addr = base + 2 + 3 * 4; 172 ap->ioaddr.lbam_addr = base + 2 + 4 * 4; 173 ap->ioaddr.lbah_addr = base + 2 + 5 * 4; 174 ap->ioaddr.device_addr = base + 2 + 6 * 4; 175 ap->ioaddr.status_addr = base + 2 + 7 * 4; 176 ap->ioaddr.command_addr = base + 2 + 7 * 4; 177 178 ap->ioaddr.altstatus_addr = base + GAYLE_CONTROL; 179 ap->ioaddr.ctl_addr = base + GAYLE_CONTROL; 180 181 ap->private_data = (void *)ZTWO_VADDR(pdata->irqport); 182 183 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", pdata->base, 184 pdata->base + GAYLE_CONTROL); 185 186 ret = ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt, 187 IRQF_SHARED, &pata_gayle_sht); 188 if (ret) 189 return ret; 190 191 platform_set_drvdata(pdev, host); 192 193 return 0; 194 } 195 196 static void pata_gayle_remove_one(struct platform_device *pdev) 197 { 198 struct ata_host *host = platform_get_drvdata(pdev); 199 200 ata_host_detach(host); 201 } 202 203 static struct platform_driver pata_gayle_driver = { 204 .probe = pata_gayle_init_one, 205 .remove_new = pata_gayle_remove_one, 206 .driver = { 207 .name = "amiga-gayle-ide", 208 }, 209 }; 210 211 module_platform_driver(pata_gayle_driver); 212 213 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); 214 MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA"); 215 MODULE_LICENSE("GPL v2"); 216 MODULE_ALIAS("platform:amiga-gayle-ide"); 217 MODULE_VERSION(DRV_VERSION); 218