299 lines · c
1// SPDX-License-Identifier: GPL-2.02 3/*4 * Buddha, Catweasel and X-Surf PATA controller driver5 *6 * Copyright (c) 2018 Samsung Electronics Co., Ltd.7 * http://www.samsung.com8 *9 * Based on buddha.c:10 *11 * Copyright (C) 1997, 2001 by Geert Uytterhoeven and others12 */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/mod_devicetable.h>22#include <linux/module.h>23#include <linux/types.h>24#include <linux/zorro.h>25#include <scsi/scsi_cmnd.h>26#include <scsi/scsi_host.h>27 28#include <asm/amigahw.h>29#include <asm/amigaints.h>30#include <asm/setup.h>31 32#define DRV_NAME "pata_buddha"33#define DRV_VERSION "0.1.1"34 35#define BUDDHA_BASE1 0x80036#define BUDDHA_BASE2 0xa0037#define BUDDHA_BASE3 0xc0038#define XSURF_BASE1 0xb000 /* 2.5" interface */39#define XSURF_BASE2 0xd000 /* 3.5" interface */40#define BUDDHA_CONTROL 0x11a41#define BUDDHA_IRQ 0xf0042#define XSURF_IRQ 0x7e43#define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */44 45enum {46 BOARD_BUDDHA = 0,47 BOARD_CATWEASEL,48 BOARD_XSURF49};50 51static unsigned int buddha_bases[3] = {52 BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE353};54 55static unsigned int xsurf_bases[2] = {56 XSURF_BASE1, XSURF_BASE257};58 59static const struct scsi_host_template pata_buddha_sht = {60 ATA_PIO_SHT(DRV_NAME),61};62 63/* FIXME: is this needed? */64static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc,65 unsigned char *buf,66 unsigned int buflen, int rw)67{68 struct ata_device *dev = qc->dev;69 struct ata_port *ap = dev->link->ap;70 void __iomem *data_addr = ap->ioaddr.data_addr;71 unsigned int words = buflen >> 1;72 73 /* Transfer multiple of 2 bytes */74 if (rw == READ)75 raw_insw((u16 *)data_addr, (u16 *)buf, words);76 else77 raw_outsw((u16 *)data_addr, (u16 *)buf, words);78 79 /* Transfer trailing byte, if any. */80 if (unlikely(buflen & 0x01)) {81 unsigned char pad[2] = { };82 83 /* Point buf to the tail of buffer */84 buf += buflen - 1;85 86 if (rw == READ) {87 raw_insw((u16 *)data_addr, (u16 *)pad, 1);88 *buf = pad[0];89 } else {90 pad[0] = *buf;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 has101 * already been configured..102 */103static int pata_buddha_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 118static bool pata_buddha_irq_check(struct ata_port *ap)119{120 u8 ch;121 122 ch = z_readb((unsigned long)ap->private_data);123 124 return !!(ch & 0x80);125}126 127static void pata_xsurf_irq_clear(struct ata_port *ap)128{129 z_writeb(0, (unsigned long)ap->private_data);130}131 132static struct ata_port_operations pata_buddha_ops = {133 .inherits = &ata_sff_port_ops,134 .sff_data_xfer = pata_buddha_data_xfer,135 .sff_irq_check = pata_buddha_irq_check,136 .cable_detect = ata_cable_unknown,137 .set_mode = pata_buddha_set_mode,138};139 140static struct ata_port_operations pata_xsurf_ops = {141 .inherits = &ata_sff_port_ops,142 .sff_data_xfer = pata_buddha_data_xfer,143 .sff_irq_check = pata_buddha_irq_check,144 .sff_irq_clear = pata_xsurf_irq_clear,145 .cable_detect = ata_cable_unknown,146 .set_mode = pata_buddha_set_mode,147};148 149static int pata_buddha_probe(struct zorro_dev *z,150 const struct zorro_device_id *ent)151{152 static const char * const board_name[] = {153 "Buddha", "Catweasel", "X-Surf"154 };155 struct ata_host *host;156 void __iomem *buddha_board;157 unsigned long board;158 unsigned int type = ent->driver_data;159 unsigned int nr_ports = (type == BOARD_CATWEASEL) ? 3 : 2;160 void *old_drvdata;161 int i;162 163 dev_info(&z->dev, "%s IDE controller\n", board_name[type]);164 165 board = z->resource.start;166 167 if (type != BOARD_XSURF) {168 if (!devm_request_mem_region(&z->dev,169 board + BUDDHA_BASE1,170 0x800, DRV_NAME))171 return -ENXIO;172 } else {173 if (!devm_request_mem_region(&z->dev,174 board + XSURF_BASE1,175 0x1000, DRV_NAME))176 return -ENXIO;177 if (!devm_request_mem_region(&z->dev,178 board + XSURF_BASE2,179 0x1000, DRV_NAME)) {180 }181 }182 183 /* Workaround for X-Surf: Save drvdata in case zorro8390 has set it */184 if (type == BOARD_XSURF)185 old_drvdata = dev_get_drvdata(&z->dev);186 187 /* allocate host */188 host = ata_host_alloc(&z->dev, nr_ports);189 if (type == BOARD_XSURF)190 dev_set_drvdata(&z->dev, old_drvdata);191 if (!host)192 return -ENXIO;193 194 buddha_board = ZTWO_VADDR(board);195 196 /* enable the board IRQ on Buddha/Catweasel */197 if (type != BOARD_XSURF)198 z_writeb(0, buddha_board + BUDDHA_IRQ_MR);199 200 for (i = 0; i < nr_ports; i++) {201 struct ata_port *ap = host->ports[i];202 void __iomem *base, *irqport;203 unsigned long ctl = 0;204 205 if (type != BOARD_XSURF) {206 ap->ops = &pata_buddha_ops;207 base = buddha_board + buddha_bases[i];208 ctl = BUDDHA_CONTROL;209 irqport = buddha_board + BUDDHA_IRQ + i * 0x40;210 } else {211 ap->ops = &pata_xsurf_ops;212 base = buddha_board + xsurf_bases[i];213 /* X-Surf has no CS1* (Control/AltStat) */214 irqport = buddha_board + XSURF_IRQ;215 }216 217 ap->pio_mask = ATA_PIO4;218 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;219 220 ap->ioaddr.data_addr = base;221 ap->ioaddr.error_addr = base + 2 + 1 * 4;222 ap->ioaddr.feature_addr = base + 2 + 1 * 4;223 ap->ioaddr.nsect_addr = base + 2 + 2 * 4;224 ap->ioaddr.lbal_addr = base + 2 + 3 * 4;225 ap->ioaddr.lbam_addr = base + 2 + 4 * 4;226 ap->ioaddr.lbah_addr = base + 2 + 5 * 4;227 ap->ioaddr.device_addr = base + 2 + 6 * 4;228 ap->ioaddr.status_addr = base + 2 + 7 * 4;229 ap->ioaddr.command_addr = base + 2 + 7 * 4;230 231 if (ctl) {232 ap->ioaddr.altstatus_addr = base + ctl;233 ap->ioaddr.ctl_addr = base + ctl;234 }235 236 ap->private_data = (void *)irqport;237 238 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board,239 ctl ? board + buddha_bases[i] + ctl : 0);240 }241 242 ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,243 IRQF_SHARED, &pata_buddha_sht);244 245 return 0;246}247 248static void pata_buddha_remove(struct zorro_dev *z)249{250 struct ata_host *host = dev_get_drvdata(&z->dev);251 252 ata_host_detach(host);253}254 255static const struct zorro_device_id pata_buddha_zorro_tbl[] = {256 { ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, BOARD_BUDDHA},257 { ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, BOARD_CATWEASEL},258 { 0 }259};260MODULE_DEVICE_TABLE(zorro, pata_buddha_zorro_tbl);261 262static struct zorro_driver pata_buddha_driver = {263 .name = "pata_buddha",264 .id_table = pata_buddha_zorro_tbl,265 .probe = pata_buddha_probe,266 .remove = pata_buddha_remove,267};268 269/*270 * We cannot have a modalias for X-Surf boards, as it competes with the271 * zorro8390 network driver. As a stopgap measure until we have proper272 * MFD support for this board, we manually attach to it late after Zorro273 * has enumerated its boards.274 */275static int __init pata_buddha_late_init(void)276{277 struct zorro_dev *z = NULL;278 279 /* Auto-bind to regular boards */280 zorro_register_driver(&pata_buddha_driver);281 282 /* Manually bind to all X-Surf boards */283 while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) {284 static struct zorro_device_id xsurf_ent = {285 ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF286 };287 288 pata_buddha_probe(z, &xsurf_ent);289 }290 291 return 0;292}293late_initcall(pata_buddha_late_init);294 295MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");296MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");297MODULE_LICENSE("GPL v2");298MODULE_VERSION(DRV_VERSION);299