1/*
  2 * TX4938 internal IDE driver
  3 * Based on tx4939ide.c.
  4 *
  5 * This file is subject to the terms and conditions of the GNU General Public
  6 * License.  See the file "COPYING" in the main directory of this archive
  7 * for more details.
  8 *
  9 * (C) Copyright TOSHIBA CORPORATION 2005-2007
 10 */
 11
 12#include <linux/module.h>
 13#include <linux/types.h>
 14#include <linux/ide.h>
 15#include <linux/init.h>
 16#include <linux/platform_device.h>
 17#include <linux/io.h>
 18
 19#include <asm/ide.h>
 20#include <asm/txx9/tx4938.h>
 21
 22static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
 23				 unsigned int gbus_clock,
 24				 u8 pio)
 25{
 26	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 27	u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);
 28	unsigned int sp = (cr >> 4) & 3;
 29	unsigned int clock = gbus_clock / (4 - sp);
 30	unsigned int cycle = 1000000000 / clock;
 31	unsigned int shwt;
 32	int wt;
 33
 34	/* Minimum DIOx- active time */
 35	wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
 36	/* IORDY setup time: 35ns */
 37	wt = max_t(int, wt, DIV_ROUND_UP(35, cycle));
 38	/* actual wait-cycle is max(wt & ~1, 1) */
 39	if (wt > 2 && (wt & 1))
 40		wt++;
 41	wt &= ~1;
 42	/* Address-valid to DIOR/DIOW setup */
 43	shwt = DIV_ROUND_UP(t->setup, cycle);
 44
 45	/* -DIOx recovery time (SHWT * 4) and cycle time requirement */
 46	while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
 47		shwt++;
 48	if (shwt > 7) {
 49		pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
 50		shwt = 7;
 51	}
 52	pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
 53		 ebus_ch, cycle, wt, shwt);
 54
 55	__raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
 56		     &tx4938_ebuscptr->cr[ebus_ch]);
 57}
 58
 59static void tx4938ide_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 60{
 61	struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
 62	u8 safe = drive->pio_mode - XFER_PIO_0;
 63	ide_drive_t *pair;
 64
 65	pair = ide_get_pair_dev(drive);
 66	if (pair)
 67		safe = min_t(u8, safe, pair->pio_mode - XFER_PIO_0);
 68	tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
 69}
 70
 71#ifdef __BIG_ENDIAN
 72
 73/* custom iops (independent from SWAP_IO_SPACE) */
 74static void tx4938ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
 75				void *buf, unsigned int len)
 76{
 77	unsigned long port = drive->hwif->io_ports.data_addr;
 78	unsigned short *ptr = buf;
 79	unsigned int count = (len + 1) / 2;
 80
 81	while (count--)
 82		*ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
 83	__ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 84}
 85
 86static void tx4938ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
 87				void *buf, unsigned int len)
 88{
 89	unsigned long port = drive->hwif->io_ports.data_addr;
 90	unsigned short *ptr = buf;
 91	unsigned int count = (len + 1) / 2;
 92
 93	while (count--) {
 94		__raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
 95		ptr++;
 96	}
 97	__ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 98}
 99
100static const struct ide_tp_ops tx4938ide_tp_ops = {
101	.exec_command		= ide_exec_command,
102	.read_status		= ide_read_status,
103	.read_altstatus		= ide_read_altstatus,
104	.write_devctl		= ide_write_devctl,
105
106	.dev_select		= ide_dev_select,
107	.tf_load		= ide_tf_load,
108	.tf_read		= ide_tf_read,
109
110	.input_data		= tx4938ide_input_data_swap,
111	.output_data		= tx4938ide_output_data_swap,
112};
113
114#endif	/* __BIG_ENDIAN */
115
116static const struct ide_port_ops tx4938ide_port_ops = {
117	.set_pio_mode		= tx4938ide_set_pio_mode,
118};
119
120static const struct ide_port_info tx4938ide_port_info __initdata = {
121	.port_ops		= &tx4938ide_port_ops,
122#ifdef __BIG_ENDIAN
123	.tp_ops			= &tx4938ide_tp_ops,
124#endif
125	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
126	.pio_mask		= ATA_PIO5,
127	.chipset		= ide_generic,
128};
129
130static int __init tx4938ide_probe(struct platform_device *pdev)
131{
132	struct ide_hw hw, *hws[] = { &hw };
133	struct ide_host *host;
134	struct resource *res;
135	struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
136	int irq, ret, i;
137	unsigned long mapbase, mapctl;
138	struct ide_port_info d = tx4938ide_port_info;
139
140	irq = platform_get_irq(pdev, 0);
141	if (irq < 0)
142		return -ENODEV;
143	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144	if (!res)
145		return -ENODEV;
146
147	if (!devm_request_mem_region(&pdev->dev, res->start,
148				     resource_size(res), "tx4938ide"))
149		return -EBUSY;
150	mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
151					      8 << pdata->ioport_shift);
152	mapctl = (unsigned long)devm_ioremap(&pdev->dev,
153					     res->start + 0x10000 +
154					     (6 << pdata->ioport_shift),
155					     1 << pdata->ioport_shift);
156	if (!mapbase || !mapctl)
157		return -EBUSY;
158
159	memset(&hw, 0, sizeof(hw));
160	if (pdata->ioport_shift) {
161		unsigned long port = mapbase;
162		unsigned long ctl = mapctl;
163
164		hw.io_ports_array[0] = port;
165#ifdef __BIG_ENDIAN
166		port++;
167		ctl++;
168#endif
169		for (i = 1; i <= 7; i++)
170			hw.io_ports_array[i] =
171				port + (i << pdata->ioport_shift);
172		hw.io_ports.ctl_addr = ctl;
173	} else
174		ide_std_init_ports(&hw, mapbase, mapctl);
175	hw.irq = irq;
176	hw.dev = &pdev->dev;
177
178	pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
179		mapbase, mapctl, hw.irq);
180	if (pdata->gbus_clock)
181		tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
182	else
183		d.port_ops = NULL;
184	ret = ide_host_add(&d, hws, 1, &host);
185	if (!ret)
186		platform_set_drvdata(pdev, host);
187	return ret;
188}
189
190static int __exit tx4938ide_remove(struct platform_device *pdev)
191{
192	struct ide_host *host = platform_get_drvdata(pdev);
193
194	ide_host_remove(host);
195	return 0;
196}
197
198static struct platform_driver tx4938ide_driver = {
199	.driver		= {
200		.name	= "tx4938ide",
201		.owner	= THIS_MODULE,
202	},
203	.remove = __exit_p(tx4938ide_remove),
204};
205
206static int __init tx4938ide_init(void)
207{
208	return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
209}
210
211static void __exit tx4938ide_exit(void)
212{
213	platform_driver_unregister(&tx4938ide_driver);
214}
215
216module_init(tx4938ide_init);
217module_exit(tx4938ide_exit);
218
219MODULE_DESCRIPTION("TX4938 internal IDE driver");
220MODULE_LICENSE("GPL");
221MODULE_ALIAS("platform:tx4938ide");