1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2000
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7/*
8 * Support for harddisk partitions.
9 *
10 * To be compatible with LinuxPPC and Apple we use the standard Apple
11 * SCSI disk partitioning scheme. For more information see:
12 * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
13 */
14
15#include <common.h>
16#include <command.h>
17#include <log.h>
18#include <memalign.h>
19#include <ide.h>
20#include "part_mac.h"
21#include <part.h>
22
23/* stdlib.h causes some compatibility problems; should fixe these! -- wd */
24#ifndef __ldiv_t_defined
25typedef struct {
26	long int quot;		/* Quotient	*/
27	long int rem;		/* Remainder	*/
28} ldiv_t;
29extern ldiv_t ldiv (long int __numer, long int __denom);
30# define __ldiv_t_defined	1
31#endif
32
33
34static int part_mac_read_ddb(struct blk_desc *desc, mac_driver_desc_t *ddb_p);
35static int part_mac_read_pdb(struct blk_desc *desc, int part,
36			     mac_partition_t *pdb_p);
37
38/*
39 * Test for a valid MAC partition
40 */
41static int part_test_mac(struct blk_desc *desc)
42{
43	ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
44	ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
45	ulong i, n;
46
47	if (part_mac_read_ddb(desc, ddesc)) {
48		/*
49		 * error reading Driver Descriptor Block,
50		 * or no valid Signature
51		 */
52		return (-1);
53	}
54
55	n = 1;	/* assuming at least one partition */
56	for (i=1; i<=n; ++i) {
57		if ((blk_dread(desc, i, 1, (ulong *)mpart) != 1) ||
58		    mpart->signature != MAC_PARTITION_MAGIC) {
59			return (-1);
60		}
61		/* update partition count */
62		n = mpart->map_count;
63	}
64	return (0);
65}
66
67static void part_print_mac(struct blk_desc *desc)
68{
69	ulong i, n;
70	ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
71	ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
72	ldiv_t mb, gb;
73
74	if (part_mac_read_ddb(desc, ddesc)) {
75		/*
76		 * error reading Driver Descriptor Block,
77		 * or no valid Signature
78		 */
79		return;
80	}
81
82	n  = ddesc->blk_count;
83
84	mb = ldiv(n, ((1024 * 1024) / ddesc->blk_size)); /* MB */
85	/* round to 1 digit */
86	mb.rem *= 10 * ddesc->blk_size;
87	mb.rem += 512 * 1024;
88	mb.rem /= 1024 * 1024;
89
90	gb = ldiv(10 * mb.quot + mb.rem, 10240);
91	gb.rem += 512;
92	gb.rem /= 1024;
93
94
95	printf ("Block Size=%d, Number of Blocks=%d, "
96		"Total Capacity: %ld.%ld MB = %ld.%ld GB\n"
97		"DeviceType=0x%x, DeviceId=0x%x\n\n"
98		"   #:                 type name"
99		"                   length   base       (size)\n",
100		ddesc->blk_size,
101		ddesc->blk_count,
102		mb.quot, mb.rem, gb.quot, gb.rem,
103		ddesc->dev_type, ddesc->dev_id
104		);
105
106	n = 1;	/* assuming at least one partition */
107	for (i=1; i<=n; ++i) {
108		ulong bytes;
109		char c;
110
111		printf ("%4ld: ", i);
112		if (blk_dread(desc, i, 1, (ulong *)mpart) != 1) {
113			printf ("** Can't read Partition Map on %d:%ld **\n",
114				desc->devnum, i);
115			return;
116		}
117
118		if (mpart->signature != MAC_PARTITION_MAGIC) {
119			printf("** Bad Signature on %d:%ld - expected 0x%04x, got 0x%04x\n",
120			       desc->devnum, i, MAC_PARTITION_MAGIC,
121			       mpart->signature);
122			return;
123		}
124
125		/* update partition count */
126		n = mpart->map_count;
127
128		c      = 'k';
129		bytes  = mpart->block_count;
130		bytes /= (1024 / ddesc->blk_size);  /* kB; assumes blk_size == 512 */
131		if (bytes >= 1024) {
132			bytes >>= 10;
133			c = 'M';
134		}
135		if (bytes >= 1024) {
136			bytes >>= 10;
137			c = 'G';
138		}
139
140		printf ("%20.32s %-18.32s %10u @ %-10u (%3ld%c)\n",
141			mpart->type,
142			mpart->name,
143			mpart->block_count,
144			mpart->start_block,
145			bytes, c
146			);
147	}
148
149	return;
150}
151
152
153/*
154 * Read Device Descriptor Block
155 */
156static int part_mac_read_ddb(struct blk_desc *desc, mac_driver_desc_t *ddb_p)
157{
158	if (blk_dread(desc, 0, 1, (ulong *)ddb_p) != 1) {
159		debug("** Can't read Driver Descriptor Block **\n");
160		return (-1);
161	}
162
163	if (ddb_p->signature != MAC_DRIVER_MAGIC) {
164		return (-1);
165	}
166	return (0);
167}
168
169/*
170 * Read Partition Descriptor Block
171 */
172static int part_mac_read_pdb(struct blk_desc *desc, int part,
173			     mac_partition_t *pdb_p)
174{
175	int n = 1;
176
177	for (;;) {
178		/*
179		 * We must always read the descritpor block for
180		 * partition 1 first since this is the only way to
181		 * know how many partitions we have.
182		 */
183		if (blk_dread(desc, n, 1, (ulong *)pdb_p) != 1) {
184			printf("** Can't read Partition Map on %d:%d **\n",
185			       desc->devnum, n);
186			return (-1);
187		}
188
189		if (pdb_p->signature != MAC_PARTITION_MAGIC) {
190			printf("** Bad Signature on %d:%d: expected 0x%04x, got 0x%04x\n",
191			       desc->devnum, n, MAC_PARTITION_MAGIC,
192			       pdb_p->signature);
193			return (-1);
194		}
195
196		if (n == part)
197			return (0);
198
199		if ((part < 1) || (part > pdb_p->map_count)) {
200			printf("** Invalid partition %d:%d [%d:1...%d:%d only]\n",
201			       desc->devnum, part, desc->devnum, desc->devnum,
202			       pdb_p->map_count);
203			return (-1);
204		}
205
206		/* update partition count */
207		n = part;
208	}
209
210	/* NOTREACHED */
211}
212
213static int part_get_info_mac(struct blk_desc *desc, int part,
214			     struct disk_partition *info)
215{
216	ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
217	ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
218
219	if (part_mac_read_ddb(desc, ddesc))
220		return -1;
221
222	info->blksz = ddesc->blk_size;
223
224	if (part_mac_read_pdb(desc, part, mpart))
225		return -1;
226
227	info->start = mpart->start_block;
228	info->size  = mpart->block_count;
229	memcpy (info->type, mpart->type, sizeof(info->type));
230	memcpy (info->name, mpart->name, sizeof(info->name));
231
232	return (0);
233}
234
235U_BOOT_PART_TYPE(mac) = {
236	.name		= "MAC",
237	.part_type	= PART_TYPE_MAC,
238	.max_entries	= MAC_ENTRY_NUMBERS,
239	.get_info	= part_get_info_mac,
240	.print		= part_print_mac,
241	.test		= part_test_mac,
242};
243