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
 19#include <asm/setup.h>
 20#include <asm/atarihw.h>
 21#include <asm/atariints.h>
 22#include <asm/atari_stdma.h>
 23#include <asm/ide.h>
 24
 25#define DRV_NAME "falconide"
 26
 27    /*
 28     *  Base of the IDE interface
 29     */
 30
 31#define ATA_HD_BASE	0xfff00000
 32
 33    /*
 34     *  Offsets from the above base
 35     */
 36
 37#define ATA_HD_CONTROL	0x39
 38
 39    /*
 40     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
 41     *  which is shared between several drivers.
 42     */
 43
 44static int falconide_intr_lock;
 45
 46static void falconide_release_lock(void)
 47{
 48	if (falconide_intr_lock == 0) {
 49		printk(KERN_ERR "%s: bug\n", __func__);
 50		return;
 51	}
 52	falconide_intr_lock = 0;
 53	stdma_release();
 54}
 55
 56static void falconide_get_lock(irq_handler_t handler, void *data)
 57{
 58	if (falconide_intr_lock == 0) {
 59		if (in_interrupt() > 0)
 60			panic("Falcon IDE hasn't ST-DMA lock in interrupt");
 61		stdma_lock(handler, data);
 62		falconide_intr_lock = 1;
 63	}
 64}
 65
 66static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
 67				 void *buf, unsigned int len)
 68{
 69	unsigned long data_addr = drive->hwif->io_ports.data_addr;
 70
 71	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
 72		__ide_mm_insw(data_addr, buf, (len + 1) / 2);
 73		return;
 74	}
 75
 76	raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
 77}
 78
 79static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
 80				  void *buf, unsigned int len)
 81{
 82	unsigned long data_addr = drive->hwif->io_ports.data_addr;
 83
 84	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
 85		__ide_mm_outsw(data_addr, buf, (len + 1) / 2);
 86		return;
 87	}
 88
 89	raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
 90}
 91
 92/* Atari has a byte-swapped IDE interface */
 93static const struct ide_tp_ops falconide_tp_ops = {
 94	.exec_command		= ide_exec_command,
 95	.read_status		= ide_read_status,
 96	.read_altstatus		= ide_read_altstatus,
 97	.write_devctl		= ide_write_devctl,
 98
 99	.dev_select		= ide_dev_select,
100	.tf_load		= ide_tf_load,
101	.tf_read		= ide_tf_read,
102
103	.input_data		= falconide_input_data,
104	.output_data		= falconide_output_data,
105};
106
107static const struct ide_port_info falconide_port_info = {
108	.get_lock		= falconide_get_lock,
109	.release_lock		= falconide_release_lock,
110	.tp_ops			= &falconide_tp_ops,
111	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
112				  IDE_HFLAG_NO_DMA,
113	.irq_flags		= IRQF_SHARED,
114	.chipset		= ide_generic,
115};
116
117static void __init falconide_setup_ports(struct ide_hw *hw)
118{
119	int i;
120
121	memset(hw, 0, sizeof(*hw));
122
123	hw->io_ports.data_addr = ATA_HD_BASE;
124
125	for (i = 1; i < 8; i++)
126		hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
127
128	hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
129
130	hw->irq = IRQ_MFP_IDE;
131}
132
133    /*
134     *  Probe for a Falcon IDE interface
135     */
136
137static int __init falconide_init(void)
138{
139	struct ide_host *host;
140	struct ide_hw hw, *hws[] = { &hw };
141	int rc;
142
143	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
144		return -ENODEV;
145
146	printk(KERN_INFO "ide: Falcon IDE controller\n");
147
148	if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
149		printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
150		return -EBUSY;
151	}
152
153	falconide_setup_ports(&hw);
154
155	host = ide_host_alloc(&falconide_port_info, hws, 1);
156	if (host == NULL) {
157		rc = -ENOMEM;
158		goto err;
159	}
160
161	falconide_get_lock(NULL, NULL);
162	rc = ide_host_register(host, &falconide_port_info, hws);
163	falconide_release_lock();
164
165	if (rc)
166		goto err_free;
167
168	return 0;
169err_free:
170	ide_host_free(host);
171err:
172	release_mem_region(ATA_HD_BASE, 0x40);
173	return rc;
174}
175
176module_init(falconide_init);
177
178MODULE_LICENSE("GPL");