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1 | /* | |
2 | * Amiga Gayle IDE Driver | |
3 | * | |
4 | * Created 9 Jul 1997 by Geert Uytterhoeven | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file COPYING in the main directory of this archive for | |
8 | * more details. | |
9 | */ | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/blkdev.h> | |
15 | #include <linux/ide.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/zorro.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | ||
21 | #include <asm/setup.h> | |
22 | #include <asm/amigahw.h> | |
23 | #include <asm/amigaints.h> | |
24 | #include <asm/amigayle.h> | |
25 | ||
26 | ||
27 | /* | |
28 | * Offsets from one of the above bases | |
29 | */ | |
30 | ||
31 | #define GAYLE_CONTROL 0x101a | |
32 | ||
33 | /* | |
34 | * These are at different offsets from the base | |
35 | */ | |
36 | ||
37 | #define GAYLE_IRQ_4000 0xdd3020 /* MSB = 1, Harddisk is source of */ | |
38 | #define GAYLE_IRQ_1200 0xda9000 /* interrupt */ | |
39 | ||
40 | ||
41 | /* | |
42 | * Offset of the secondary port for IDE doublers | |
43 | * Note that GAYLE_CONTROL is NOT available then! | |
44 | */ | |
45 | ||
46 | #define GAYLE_NEXT_PORT 0x1000 | |
47 | ||
48 | #define GAYLE_NUM_HWIFS 2 | |
49 | #define GAYLE_NUM_PROBE_HWIFS (ide_doubler ? GAYLE_NUM_HWIFS : \ | |
50 | GAYLE_NUM_HWIFS-1) | |
51 | #define GAYLE_HAS_CONTROL_REG (!ide_doubler) | |
52 | ||
53 | static bool ide_doubler; | |
54 | module_param_named(doubler, ide_doubler, bool, 0); | |
55 | MODULE_PARM_DESC(doubler, "enable support for IDE doublers"); | |
56 | ||
57 | /* | |
58 | * Check and acknowledge the interrupt status | |
59 | */ | |
60 | ||
61 | static int gayle_test_irq(ide_hwif_t *hwif) | |
62 | { | |
63 | unsigned char ch; | |
64 | ||
65 | ch = z_readb(hwif->io_ports.irq_addr); | |
66 | if (!(ch & GAYLE_IRQ_IDE)) | |
67 | return 0; | |
68 | return 1; | |
69 | } | |
70 | ||
71 | static void gayle_a1200_clear_irq(ide_drive_t *drive) | |
72 | { | |
73 | ide_hwif_t *hwif = drive->hwif; | |
74 | ||
75 | (void)z_readb(hwif->io_ports.status_addr); | |
76 | z_writeb(0x7c, hwif->io_ports.irq_addr); | |
77 | } | |
78 | ||
79 | static void __init gayle_setup_ports(struct ide_hw *hw, unsigned long base, | |
80 | unsigned long ctl, unsigned long irq_port) | |
81 | { | |
82 | int i; | |
83 | ||
84 | memset(hw, 0, sizeof(*hw)); | |
85 | ||
86 | hw->io_ports.data_addr = base; | |
87 | ||
88 | for (i = 1; i < 8; i++) | |
89 | hw->io_ports_array[i] = base + 2 + i * 4; | |
90 | ||
91 | hw->io_ports.ctl_addr = ctl; | |
92 | hw->io_ports.irq_addr = irq_port; | |
93 | ||
94 | hw->irq = IRQ_AMIGA_PORTS; | |
95 | } | |
96 | ||
97 | static const struct ide_port_ops gayle_a4000_port_ops = { | |
98 | .test_irq = gayle_test_irq, | |
99 | }; | |
100 | ||
101 | static const struct ide_port_ops gayle_a1200_port_ops = { | |
102 | .clear_irq = gayle_a1200_clear_irq, | |
103 | .test_irq = gayle_test_irq, | |
104 | }; | |
105 | ||
106 | static const struct ide_port_info gayle_port_info = { | |
107 | .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE | | |
108 | IDE_HFLAG_NO_DMA, | |
109 | .irq_flags = IRQF_SHARED, | |
110 | .chipset = ide_generic, | |
111 | }; | |
112 | ||
113 | /* | |
114 | * Probe for a Gayle IDE interface (and optionally for an IDE doubler) | |
115 | */ | |
116 | ||
117 | static int __init amiga_gayle_ide_probe(struct platform_device *pdev) | |
118 | { | |
119 | struct resource *res; | |
120 | struct gayle_ide_platform_data *pdata; | |
121 | unsigned long base, ctrlport, irqport; | |
122 | unsigned int i; | |
123 | int error; | |
124 | struct ide_hw hw[GAYLE_NUM_HWIFS], *hws[GAYLE_NUM_HWIFS]; | |
125 | struct ide_port_info d = gayle_port_info; | |
126 | struct ide_host *host; | |
127 | ||
128 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
129 | if (!res) | |
130 | return -ENODEV; | |
131 | ||
132 | if (!request_mem_region(res->start, resource_size(res), "IDE")) | |
133 | return -EBUSY; | |
134 | ||
135 | pdata = dev_get_platdata(&pdev->dev); | |
136 | pr_info("ide: Gayle IDE controller (A%u style%s)\n", | |
137 | pdata->explicit_ack ? 1200 : 4000, | |
138 | ide_doubler ? ", IDE doubler" : ""); | |
139 | ||
140 | base = (unsigned long)ZTWO_VADDR(pdata->base); | |
141 | ctrlport = 0; | |
142 | irqport = (unsigned long)ZTWO_VADDR(pdata->irqport); | |
143 | if (pdata->explicit_ack) | |
144 | d.port_ops = &gayle_a1200_port_ops; | |
145 | else | |
146 | d.port_ops = &gayle_a4000_port_ops; | |
147 | ||
148 | for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++, base += GAYLE_NEXT_PORT) { | |
149 | if (GAYLE_HAS_CONTROL_REG) | |
150 | ctrlport = base + GAYLE_CONTROL; | |
151 | ||
152 | gayle_setup_ports(&hw[i], base, ctrlport, irqport); | |
153 | hws[i] = &hw[i]; | |
154 | } | |
155 | ||
156 | error = ide_host_add(&d, hws, i, &host); | |
157 | if (error) | |
158 | goto out; | |
159 | ||
160 | platform_set_drvdata(pdev, host); | |
161 | return 0; | |
162 | ||
163 | out: | |
164 | release_mem_region(res->start, resource_size(res)); | |
165 | return error; | |
166 | } | |
167 | ||
168 | static int __exit amiga_gayle_ide_remove(struct platform_device *pdev) | |
169 | { | |
170 | struct ide_host *host = platform_get_drvdata(pdev); | |
171 | struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
172 | ||
173 | ide_host_remove(host); | |
174 | release_mem_region(res->start, resource_size(res)); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static struct platform_driver amiga_gayle_ide_driver = { | |
179 | .remove = __exit_p(amiga_gayle_ide_remove), | |
180 | .driver = { | |
181 | .name = "amiga-gayle-ide", | |
182 | }, | |
183 | }; | |
184 | ||
185 | module_platform_driver_probe(amiga_gayle_ide_driver, amiga_gayle_ide_probe); | |
186 | ||
187 | MODULE_LICENSE("GPL"); | |
188 | MODULE_ALIAS("platform:amiga-gayle-ide"); |