1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * Buddha, Catweasel and X-Surf PATA controller driver 5 * 6 * Copyright (c) 2018 Samsung Electronics Co., Ltd. 7 * http://www.samsung.com 8 * 9 * Based on buddha.c: 10 * 11 * Copyright (C) 1997, 2001 by Geert Uytterhoeven and others 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/zorro.h> 23 #include <scsi/scsi_cmnd.h> 24 #include <scsi/scsi_host.h> 25 26 #include <asm/amigahw.h> 27 #include <asm/amigaints.h> 28 #include <asm/ide.h> 29 #include <asm/setup.h> 30 31 #define DRV_NAME "pata_buddha" 32 #define DRV_VERSION "0.1.0" 33 34 #define BUDDHA_BASE1 0x800 35 #define BUDDHA_BASE2 0xa00 36 #define BUDDHA_BASE3 0xc00 37 #define XSURF_BASE1 0xb000 /* 2.5" interface */ 38 #define XSURF_BASE2 0xd000 /* 3.5" interface */ 39 #define BUDDHA_CONTROL 0x11a 40 #define BUDDHA_IRQ 0xf00 41 #define XSURF_IRQ 0x7e 42 #define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */ 43 44 enum { 45 BOARD_BUDDHA = 0, 46 BOARD_CATWEASEL, 47 BOARD_XSURF 48 }; 49 50 static unsigned int buddha_bases[3] __initdata = { 51 BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3 52 }; 53 54 static unsigned int xsurf_bases[2] __initdata = { 55 XSURF_BASE1, XSURF_BASE2 56 }; 57 58 static struct scsi_host_template pata_buddha_sht = { 59 ATA_PIO_SHT(DRV_NAME), 60 }; 61 62 /* FIXME: is this needed? */ 63 static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc, 64 unsigned char *buf, 65 unsigned int buflen, int rw) 66 { 67 struct ata_device *dev = qc->dev; 68 struct ata_port *ap = dev->link->ap; 69 void __iomem *data_addr = ap->ioaddr.data_addr; 70 unsigned int words = buflen >> 1; 71 72 /* Transfer multiple of 2 bytes */ 73 if (rw == READ) 74 raw_insw((u16 *)data_addr, (u16 *)buf, words); 75 else 76 raw_outsw((u16 *)data_addr, (u16 *)buf, words); 77 78 /* Transfer trailing byte, if any. */ 79 if (unlikely(buflen & 0x01)) { 80 unsigned char pad[2] = { }; 81 82 /* Point buf to the tail of buffer */ 83 buf += buflen - 1; 84 85 if (rw == READ) { 86 raw_insw((u16 *)data_addr, (u16 *)pad, 1); 87 *buf = pad[0]; 88 } else { 89 pad[0] = *buf; 90 raw_outsw((u16 *)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_buddha_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 bool pata_buddha_irq_check(struct ata_port *ap) 118 { 119 u8 ch; 120 121 ch = z_readb((unsigned long)ap->private_data); 122 123 return !!(ch & 0x80); 124 } 125 126 static void pata_xsurf_irq_clear(struct ata_port *ap) 127 { 128 z_writeb(0, (unsigned long)ap->private_data); 129 } 130 131 static struct ata_port_operations pata_buddha_ops = { 132 .inherits = &ata_sff_port_ops, 133 .sff_data_xfer = pata_buddha_data_xfer, 134 .sff_irq_check = pata_buddha_irq_check, 135 .cable_detect = ata_cable_unknown, 136 .set_mode = pata_buddha_set_mode, 137 }; 138 139 static struct ata_port_operations pata_xsurf_ops = { 140 .inherits = &ata_sff_port_ops, 141 .sff_data_xfer = pata_buddha_data_xfer, 142 .sff_irq_check = pata_buddha_irq_check, 143 .sff_irq_clear = pata_xsurf_irq_clear, 144 .cable_detect = ata_cable_unknown, 145 .set_mode = pata_buddha_set_mode, 146 }; 147 148 static int __init pata_buddha_init_one(void) 149 { 150 struct zorro_dev *z = NULL; 151 152 while ((z = zorro_find_device(ZORRO_WILDCARD, z))) { 153 static const char *board_name[] 154 = { "Buddha", "Catweasel", "X-Surf" }; 155 struct ata_host *host; 156 void __iomem *buddha_board; 157 unsigned long board; 158 unsigned int type, nr_ports = 2; 159 int i; 160 161 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) { 162 type = BOARD_BUDDHA; 163 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) { 164 type = BOARD_CATWEASEL; 165 nr_ports++; 166 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) { 167 type = BOARD_XSURF; 168 } else 169 continue; 170 171 dev_info(&z->dev, "%s IDE controller\n", board_name[type]); 172 173 board = z->resource.start; 174 175 if (type != BOARD_XSURF) { 176 if (!devm_request_mem_region(&z->dev, 177 board + BUDDHA_BASE1, 178 0x800, DRV_NAME)) 179 continue; 180 } else { 181 if (!devm_request_mem_region(&z->dev, 182 board + XSURF_BASE1, 183 0x1000, DRV_NAME)) 184 continue; 185 if (!devm_request_mem_region(&z->dev, 186 board + XSURF_BASE2, 187 0x1000, DRV_NAME)) 188 continue; 189 } 190 191 /* allocate host */ 192 host = ata_host_alloc(&z->dev, nr_ports); 193 if (!host) 194 continue; 195 196 buddha_board = ZTWO_VADDR(board); 197 198 /* enable the board IRQ on Buddha/Catweasel */ 199 if (type != BOARD_XSURF) 200 z_writeb(0, buddha_board + BUDDHA_IRQ_MR); 201 202 for (i = 0; i < nr_ports; i++) { 203 struct ata_port *ap = host->ports[i]; 204 void __iomem *base, *irqport; 205 unsigned long ctl = 0; 206 207 if (type != BOARD_XSURF) { 208 ap->ops = &pata_buddha_ops; 209 base = buddha_board + buddha_bases[i]; 210 ctl = BUDDHA_CONTROL; 211 irqport = buddha_board + BUDDHA_IRQ + i * 0x40; 212 } else { 213 ap->ops = &pata_xsurf_ops; 214 base = buddha_board + xsurf_bases[i]; 215 /* X-Surf has no CS1* (Control/AltStat) */ 216 irqport = buddha_board + XSURF_IRQ; 217 } 218 219 ap->pio_mask = ATA_PIO4; 220 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 221 222 ap->ioaddr.data_addr = base; 223 ap->ioaddr.error_addr = base + 2 + 1 * 4; 224 ap->ioaddr.feature_addr = base + 2 + 1 * 4; 225 ap->ioaddr.nsect_addr = base + 2 + 2 * 4; 226 ap->ioaddr.lbal_addr = base + 2 + 3 * 4; 227 ap->ioaddr.lbam_addr = base + 2 + 4 * 4; 228 ap->ioaddr.lbah_addr = base + 2 + 5 * 4; 229 ap->ioaddr.device_addr = base + 2 + 6 * 4; 230 ap->ioaddr.status_addr = base + 2 + 7 * 4; 231 ap->ioaddr.command_addr = base + 2 + 7 * 4; 232 233 if (ctl) { 234 ap->ioaddr.altstatus_addr = base + ctl; 235 ap->ioaddr.ctl_addr = base + ctl; 236 } 237 238 ap->private_data = (void *)irqport; 239 240 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board, 241 ctl ? board + buddha_bases[i] + ctl : 0); 242 } 243 244 ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt, 245 IRQF_SHARED, &pata_buddha_sht); 246 247 } 248 249 return 0; 250 } 251 252 module_init(pata_buddha_init_one); 253 254 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); 255 MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA"); 256 MODULE_LICENSE("GPL v2"); 257 MODULE_VERSION(DRV_VERSION); 258