1 /*
2 * Atari Falcon IDE Driver
3 *
4 * Created 12 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/module.h>
12 #include <linux/types.h>
13 #include <linux/mm.h>
14 #include <linux/interrupt.h>
15 #include <linux/blkdev.h>
16 #include <linux/ide.h>
17 #include <linux/init.h>
18 #include <linux/platform_device.h>
19
20 #include <asm/setup.h>
21 #include <asm/atarihw.h>
22 #include <asm/atariints.h>
23 #include <asm/atari_stdma.h>
24 #include <asm/ide.h>
25
26 #define DRV_NAME "falconide"
27
28 /*
29 * Offsets from base address
30 */
31
32 #define ATA_HD_CONTROL 0x39
33
34 /*
35 * falconide_intr_lock is used to obtain access to the IDE interrupt,
36 * which is shared between several drivers.
37 */
38
39 static int falconide_intr_lock;
40
falconide_release_lock(void)41 static void falconide_release_lock(void)
42 {
43 if (falconide_intr_lock == 0) {
44 printk(KERN_ERR "%s: bug\n", __func__);
45 return;
46 }
47 falconide_intr_lock = 0;
48 stdma_release();
49 }
50
falconide_get_lock(irq_handler_t handler,void * data)51 static void falconide_get_lock(irq_handler_t handler, void *data)
52 {
53 if (falconide_intr_lock == 0) {
54 stdma_lock(handler, data);
55 falconide_intr_lock = 1;
56 }
57 }
58
falconide_input_data(ide_drive_t * drive,struct ide_cmd * cmd,void * buf,unsigned int len)59 static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
60 void *buf, unsigned int len)
61 {
62 unsigned long data_addr = drive->hwif->io_ports.data_addr;
63
64 if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
65 __ide_mm_insw(data_addr, buf, (len + 1) / 2);
66 return;
67 }
68
69 raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
70 }
71
falconide_output_data(ide_drive_t * drive,struct ide_cmd * cmd,void * buf,unsigned int len)72 static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
73 void *buf, unsigned int len)
74 {
75 unsigned long data_addr = drive->hwif->io_ports.data_addr;
76
77 if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
78 __ide_mm_outsw(data_addr, buf, (len + 1) / 2);
79 return;
80 }
81
82 raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
83 }
84
85 /* Atari has a byte-swapped IDE interface */
86 static const struct ide_tp_ops falconide_tp_ops = {
87 .exec_command = ide_exec_command,
88 .read_status = ide_read_status,
89 .read_altstatus = ide_read_altstatus,
90 .write_devctl = ide_write_devctl,
91
92 .dev_select = ide_dev_select,
93 .tf_load = ide_tf_load,
94 .tf_read = ide_tf_read,
95
96 .input_data = falconide_input_data,
97 .output_data = falconide_output_data,
98 };
99
100 static const struct ide_port_info falconide_port_info = {
101 .get_lock = falconide_get_lock,
102 .release_lock = falconide_release_lock,
103 .tp_ops = &falconide_tp_ops,
104 .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
105 IDE_HFLAG_NO_DMA,
106 .irq_flags = IRQF_SHARED,
107 .chipset = ide_generic,
108 };
109
falconide_setup_ports(struct ide_hw * hw,unsigned long base)110 static void __init falconide_setup_ports(struct ide_hw *hw, unsigned long base)
111 {
112 int i;
113
114 memset(hw, 0, sizeof(*hw));
115
116 hw->io_ports.data_addr = base;
117
118 for (i = 1; i < 8; i++)
119 hw->io_ports_array[i] = base + 1 + i * 4;
120
121 hw->io_ports.ctl_addr = base + ATA_HD_CONTROL;
122
123 hw->irq = IRQ_MFP_IDE;
124 }
125
126 /*
127 * Probe for a Falcon IDE interface
128 */
129
falconide_init(struct platform_device * pdev)130 static int __init falconide_init(struct platform_device *pdev)
131 {
132 struct resource *res;
133 struct ide_host *host;
134 struct ide_hw hw, *hws[] = { &hw };
135 unsigned long base;
136 int rc;
137
138 dev_info(&pdev->dev, "Atari Falcon IDE controller\n");
139
140 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
141 if (!res)
142 return -ENODEV;
143
144 if (!devm_request_mem_region(&pdev->dev, res->start,
145 resource_size(res), DRV_NAME)) {
146 dev_err(&pdev->dev, "resources busy\n");
147 return -EBUSY;
148 }
149
150 base = (unsigned long)res->start;
151
152 falconide_setup_ports(&hw, base);
153
154 host = ide_host_alloc(&falconide_port_info, hws, 1);
155 if (host == NULL) {
156 rc = -ENOMEM;
157 goto err;
158 }
159
160 falconide_get_lock(NULL, NULL);
161 rc = ide_host_register(host, &falconide_port_info, hws);
162 falconide_release_lock();
163
164 if (rc)
165 goto err_free;
166
167 platform_set_drvdata(pdev, host);
168 return 0;
169 err_free:
170 ide_host_free(host);
171 err:
172 release_mem_region(res->start, resource_size(res));
173 return rc;
174 }
175
falconide_remove(struct platform_device * pdev)176 static int falconide_remove(struct platform_device *pdev)
177 {
178 struct ide_host *host = platform_get_drvdata(pdev);
179
180 ide_host_remove(host);
181
182 return 0;
183 }
184
185 static struct platform_driver ide_falcon_driver = {
186 .remove = falconide_remove,
187 .driver = {
188 .name = "atari-falcon-ide",
189 },
190 };
191
192 module_platform_driver_probe(ide_falcon_driver, falconide_init);
193
194 MODULE_AUTHOR("Geert Uytterhoeven");
195 MODULE_DESCRIPTION("low-level driver for Atari Falcon IDE");
196 MODULE_LICENSE("GPL");
197 MODULE_ALIAS("platform:atari-falcon-ide");
198