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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
44enum {
45 BOARD_BUDDHA = 0,
46 BOARD_CATWEASEL,
47 BOARD_XSURF
48};
49
50static unsigned int buddha_bases[3] __initdata = {
51 BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
52};
53
54static unsigned int xsurf_bases[2] __initdata = {
55 XSURF_BASE1, XSURF_BASE2
56};
57
58static struct scsi_host_template pata_buddha_sht = {
59 ATA_PIO_SHT(DRV_NAME),
60};
61
62/* FIXME: is this needed? */
63static 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 */
102static 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
117static 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
126static void pata_xsurf_irq_clear(struct ata_port *ap)
127{
128 z_writeb(0, (unsigned long)ap->private_data);
129}
130
131static 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
139static 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
148static 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
252module_init(pata_buddha_init_one);
253
254MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
255MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");
256MODULE_LICENSE("GPL v2");
257MODULE_VERSION(DRV_VERSION);
258

Warning: That file was not part of the compilation database. It may have many parsing errors.