spi: spi-imx: spi_imx_transfer(): add support for effective_speed_hz
[linux-2.6-microblaze.git] / drivers / ide / falconide.c
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
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
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
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
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
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
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         return 0;
170 err_free:
171         ide_host_free(host);
172 err:
173         release_mem_region(res->start, resource_size(res));
174         return rc;
175 }
176
177 static int falconide_remove(struct platform_device *pdev)
178 {
179         struct ide_host *host = dev_get_drvdata(&pdev->dev);
180
181         ide_host_remove(host);
182
183         return 0;
184 }
185
186 static struct platform_driver ide_falcon_driver = {
187         .remove = falconide_remove,
188         .driver   = {
189                 .name   = "atari-falcon-ide",
190         },
191 };
192
193 module_platform_driver_probe(ide_falcon_driver, falconide_init);
194
195 MODULE_AUTHOR("Geert Uytterhoeven");
196 MODULE_DESCRIPTION("low-level driver for Atari Falcon IDE");
197 MODULE_LICENSE("GPL");
198 MODULE_ALIAS("platform:atari-falcon-ide");