falconide.c 3.77 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
/*
2
 *  Atari Falcon IDE Driver
Linus Torvalds's avatar
Linus Torvalds committed
3 4 5 6 7 8 9 10
 *
 *     Created 12 Jul 1997 by Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

Al Viro's avatar
Al Viro committed
11
#include <linux/module.h>
Linus Torvalds's avatar
Linus Torvalds committed
12 13 14 15 16 17 18 19 20 21 22 23
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/setup.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>

24
#define DRV_NAME "falconide"
Linus Torvalds's avatar
Linus Torvalds committed
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

    /*
     *  Base of the IDE interface
     */

#define ATA_HD_BASE	0xfff00000

    /*
     *  Offsets from the above base
     */

#define ATA_HD_CONTROL	0x39

    /*
     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
     *  which is shared between several drivers.
     */

43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
static int falconide_intr_lock;

static void falconide_release_lock(void)
{
	if (falconide_intr_lock == 0) {
		printk(KERN_ERR "%s: bug\n", __func__);
		return;
	}
	falconide_intr_lock = 0;
	stdma_release();
}

static void falconide_get_lock(irq_handler_t handler, void *data)
{
	if (falconide_intr_lock == 0) {
		if (in_interrupt() > 0)
			panic("Falcon IDE hasn't ST-DMA lock in interrupt");
		stdma_lock(handler, data);
		falconide_intr_lock = 1;
	}
}
Linus Torvalds's avatar
Linus Torvalds committed
64

65 66
static void falconide_input_data(ide_drive_t *drive, struct request *rq,
				 void *buf, unsigned int len)
67
{
68
	unsigned long data_addr = drive->hwif->io_ports.data_addr;
69 70

	if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
71
		return insw(data_addr, buf, (len + 1) / 2);
72

73
	raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
74 75
}

76 77
static void falconide_output_data(ide_drive_t *drive, struct request *rq,
				  void *buf, unsigned int len)
78
{
79 80
	unsigned long data_addr = drive->hwif->io_ports.data_addr;

81
	if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
82
		return outsw(data_addr, buf, (len + 1) / 2);
83

84
	raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
85 86
}

87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102
/* Atari has a byte-swapped IDE interface */
static const struct ide_tp_ops falconide_tp_ops = {
	.exec_command		= ide_exec_command,
	.read_status		= ide_read_status,
	.read_altstatus		= ide_read_altstatus,

	.set_irq		= ide_set_irq,

	.tf_load		= ide_tf_load,
	.tf_read		= ide_tf_read,

	.input_data		= falconide_input_data,
	.output_data		= falconide_output_data,
};

static const struct ide_port_info falconide_port_info = {
103 104
	.get_lock		= falconide_get_lock,
	.release_lock		= falconide_release_lock,
105
	.tp_ops			= &falconide_tp_ops,
106 107
	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
				  IDE_HFLAG_NO_DMA,
108 109
};

110 111 112 113 114 115
static void __init falconide_setup_ports(hw_regs_t *hw)
{
	int i;

	memset(hw, 0, sizeof(*hw));

116
	hw->io_ports.data_addr = ATA_HD_BASE;
117 118

	for (i = 1; i < 8; i++)
119
		hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
120

121
	hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
122 123 124

	hw->irq = IRQ_MFP_IDE;
	hw->ack_intr = NULL;
125 126

	hw->chipset = ide_generic;
127
}
Linus Torvalds's avatar
Linus Torvalds committed
128 129 130 131 132

    /*
     *  Probe for a Falcon IDE interface
     */

133
static int __init falconide_init(void)
Linus Torvalds's avatar
Linus Torvalds committed
134
{
135
	struct ide_host *host;
136
	hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
137
	int rc;
Linus Torvalds's avatar
Linus Torvalds committed
138

139
	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
140
		return -ENODEV;
141

142 143
	printk(KERN_INFO "ide: Falcon IDE controller\n");

144 145 146 147 148
	if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
		printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
		return -EBUSY;
	}

149
	falconide_setup_ports(&hw);
Linus Torvalds's avatar
Linus Torvalds committed
150

151
	host = ide_host_alloc(&falconide_port_info, hws);
152 153 154
	if (host == NULL) {
		rc = -ENOMEM;
		goto err;
155
	}
156

157
	falconide_get_lock(NULL, NULL);
158
	rc = ide_host_register(host, &falconide_port_info, hws);
159
	falconide_release_lock();
160 161 162 163

	if (rc)
		goto err_free;

164
	return 0;
165 166 167 168 169
err_free:
	ide_host_free(host);
err:
	release_mem_region(ATA_HD_BASE, 0x40);
	return rc;
Linus Torvalds's avatar
Linus Torvalds committed
170
}
171 172

module_init(falconide_init);
173 174

MODULE_LICENSE("GPL");