1 /*
2 * Macintosh IDE Driver
3 *
4 * Copyright (C) 1998 by Michael Schmitz
5 *
6 * This driver was written based on information obtained from the MacOS IDE
7 * driver binary by Mikael Forselius
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive for
11 * more details.
12 */
13
14 #include <linux/types.h>
15 #include <linux/mm.h>
16 #include <linux/interrupt.h>
17 #include <linux/blkdev.h>
18 #include <linux/delay.h>
19 #include <linux/ide.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22
23 #include <asm/macintosh.h>
24
25 #define DRV_NAME "mac_ide"
26
27 #define IDE_BASE 0x50F1A000 /* Base address of IDE controller */
28
29 /*
30 * Generic IDE registers as offsets from the base
31 * These match MkLinux so they should be correct.
32 */
33
34 #define IDE_CONTROL 0x38 /* control/altstatus */
35
36 /*
37 * Mac-specific registers
38 */
39
40 /*
41 * this register is odd; it doesn't seem to do much and it's
42 * not word-aligned like virtually every other hardware register
43 * on the Mac...
44 */
45
46 #define IDE_IFR 0x101 /* (0x101) IDE interrupt flags on Quadra:
47 *
48 * Bit 0+1: some interrupt flags
49 * Bit 2+3: some interrupt enable
50 * Bit 4: ??
51 * Bit 5: IDE interrupt flag (any hwif)
52 * Bit 6: maybe IDE interrupt enable (any hwif) ??
53 * Bit 7: Any interrupt condition
54 */
55
56 volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
57
macide_test_irq(ide_hwif_t * hwif)58 int macide_test_irq(ide_hwif_t *hwif)
59 {
60 if (*ide_ifr & 0x20)
61 return 1;
62 return 0;
63 }
64
macide_clear_irq(ide_drive_t * drive)65 static void macide_clear_irq(ide_drive_t *drive)
66 {
67 *ide_ifr &= ~0x20;
68 }
69
macide_setup_ports(struct ide_hw * hw,unsigned long base,int irq)70 static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
71 int irq)
72 {
73 int i;
74
75 memset(hw, 0, sizeof(*hw));
76
77 for (i = 0; i < 8; i++)
78 hw->io_ports_array[i] = base + i * 4;
79
80 hw->io_ports.ctl_addr = base + IDE_CONTROL;
81
82 hw->irq = irq;
83 }
84
85 static const struct ide_port_ops macide_port_ops = {
86 .clear_irq = macide_clear_irq,
87 .test_irq = macide_test_irq,
88 };
89
90 static const struct ide_port_info macide_port_info = {
91 .port_ops = &macide_port_ops,
92 .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
93 .irq_flags = IRQF_SHARED,
94 .chipset = ide_generic,
95 };
96
97 static const char *mac_ide_name[] =
98 { "Quadra", "Powerbook", "Powerbook Baboon" };
99
100 /*
101 * Probe for a Macintosh IDE interface
102 */
103
mac_ide_probe(struct platform_device * pdev)104 static int mac_ide_probe(struct platform_device *pdev)
105 {
106 struct resource *mem, *irq;
107 struct ide_hw hw, *hws[] = { &hw };
108 struct ide_port_info d = macide_port_info;
109 struct ide_host *host;
110 int rc;
111
112 if (!MACH_IS_MAC)
113 return -ENODEV;
114
115 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
116 if (!mem)
117 return -ENODEV;
118
119 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
120 if (!irq)
121 return -ENODEV;
122
123 if (!devm_request_mem_region(&pdev->dev, mem->start,
124 resource_size(mem), DRV_NAME)) {
125 dev_err(&pdev->dev, "resources busy\n");
126 return -EBUSY;
127 }
128
129 printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
130 mac_ide_name[macintosh_config->ide_type - 1]);
131
132 macide_setup_ports(&hw, mem->start, irq->start);
133
134 rc = ide_host_add(&d, hws, 1, &host);
135 if (rc)
136 return rc;
137
138 platform_set_drvdata(pdev, host);
139 return 0;
140 }
141
mac_ide_remove(struct platform_device * pdev)142 static int mac_ide_remove(struct platform_device *pdev)
143 {
144 struct ide_host *host = platform_get_drvdata(pdev);
145
146 ide_host_remove(host);
147 return 0;
148 }
149
150 static struct platform_driver mac_ide_driver = {
151 .driver = {
152 .name = DRV_NAME,
153 },
154 .probe = mac_ide_probe,
155 .remove = mac_ide_remove,
156 };
157
158 module_platform_driver(mac_ide_driver);
159
160 MODULE_ALIAS("platform:" DRV_NAME);
161 MODULE_LICENSE("GPL");
162