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
 39static int falconide_intr_lock;
 40
 41static 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
 51static 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
 61static 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
 74static 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 */
 88static 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
102static 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
112static 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
132static 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;
170err_free:
171	ide_host_free(host);
172err:
173	release_mem_region(res->start, resource_size(res));
174	return rc;
175}
176
177static 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
186static struct platform_driver ide_falcon_driver = {
187	.remove = falconide_remove,
188	.driver   = {
189		.name	= "atari-falcon-ide",
190	},
191};
192
193module_platform_driver_probe(ide_falcon_driver, falconide_init);
194
195MODULE_AUTHOR("Geert Uytterhoeven");
196MODULE_DESCRIPTION("low-level driver for Atari Falcon IDE");
197MODULE_LICENSE("GPL");
198MODULE_ALIAS("platform:atari-falcon-ide");