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 if (in_interrupt() > 0)
55 panic("Falcon IDE hasn't ST-DMA lock in interrupt");
56 stdma_lock(handler, data);
57 falconide_intr_lock = 1;
58 }
59 }
60
falconide_input_data(ide_drive_t * drive,struct ide_cmd * cmd,void * buf,unsigned int len)61 static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
62 void *buf, unsigned int len)
63 {
64 unsigned long data_addr = drive->hwif->io_ports.data_addr;
65
66 if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
67 __ide_mm_insw(data_addr, buf, (len + 1) / 2);
68 return;
69 }
70
71 raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
72 }
73
falconide_output_data(ide_drive_t * drive,struct ide_cmd * cmd,void * buf,unsigned int len)74 static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
75 void *buf, unsigned int len)
76 {
77 unsigned long data_addr = drive->hwif->io_ports.data_addr;
78
79 if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
80 __ide_mm_outsw(data_addr, buf, (len + 1) / 2);
81 return;
82 }
83
84 raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
85 }
86
87 /* Atari has a byte-swapped IDE interface */
88 static const struct ide_tp_ops falconide_tp_ops = {
89 .exec_command = ide_exec_command,
90 .read_status = ide_read_status,
91 .read_altstatus = ide_read_altstatus,
92 .write_devctl = ide_write_devctl,
93
94 .dev_select = ide_dev_select,
95 .tf_load = ide_tf_load,
96 .tf_read = ide_tf_read,
97
98 .input_data = falconide_input_data,
99 .output_data = falconide_output_data,
100 };
101
102 static const struct ide_port_info falconide_port_info = {
103 .get_lock = falconide_get_lock,
104 .release_lock = falconide_release_lock,
105 .tp_ops = &falconide_tp_ops,
106 .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
107 IDE_HFLAG_NO_DMA,
108 .irq_flags = IRQF_SHARED,
109 .chipset = ide_generic,
110 };
111
falconide_setup_ports(struct ide_hw * hw,unsigned long base)112 static void __init falconide_setup_ports(struct ide_hw *hw, unsigned long base)
113 {
114 int i;
115
116 memset(hw, 0, sizeof(*hw));
117
118 hw->io_ports.data_addr = base;
119
120 for (i = 1; i < 8; i++)
121 hw->io_ports_array[i] = base + 1 + i * 4;
122
123 hw->io_ports.ctl_addr = base + ATA_HD_CONTROL;
124
125 hw->irq = IRQ_MFP_IDE;
126 }
127
128 /*
129 * Probe for a Falcon IDE interface
130 */
131
falconide_init(struct platform_device * pdev)132 static int __init falconide_init(struct platform_device *pdev)
133 {
134 struct resource *res;
135 struct ide_host *host;
136 struct ide_hw hw, *hws[] = { &hw };
137 unsigned long base;
138 int rc;
139
140 dev_info(&pdev->dev, "Atari Falcon IDE controller\n");
141
142 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
143 if (!res)
144 return -ENODEV;
145
146 if (!devm_request_mem_region(&pdev->dev, res->start,
147 resource_size(res), DRV_NAME)) {
148 dev_err(&pdev->dev, "resources busy\n");
149 return -EBUSY;
150 }
151
152 base = (unsigned long)res->start;
153
154 falconide_setup_ports(&hw, base);
155
156 host = ide_host_alloc(&falconide_port_info, hws, 1);
157 if (host == NULL) {
158 rc = -ENOMEM;
159 goto err;
160 }
161
162 falconide_get_lock(NULL, NULL);
163 rc = ide_host_register(host, &falconide_port_info, hws);
164 falconide_release_lock();
165
166 if (rc)
167 goto err_free;
168
169 platform_set_drvdata(pdev, host);
170 return 0;
171 err_free:
172 ide_host_free(host);
173 err:
174 release_mem_region(res->start, resource_size(res));
175 return rc;
176 }
177
falconide_remove(struct platform_device * pdev)178 static int falconide_remove(struct platform_device *pdev)
179 {
180 struct ide_host *host = platform_get_drvdata(pdev);
181
182 ide_host_remove(host);
183
184 return 0;
185 }
186
187 static struct platform_driver ide_falcon_driver = {
188 .remove = falconide_remove,
189 .driver = {
190 .name = "atari-falcon-ide",
191 },
192 };
193
194 module_platform_driver_probe(ide_falcon_driver, falconide_init);
195
196 MODULE_AUTHOR("Geert Uytterhoeven");
197 MODULE_DESCRIPTION("low-level driver for Atari Falcon IDE");
198 MODULE_LICENSE("GPL");
199 MODULE_ALIAS("platform:atari-falcon-ide");
200