2 * TX4938 internal IDE driver
3 * Based on tx4939ide.c.
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
9 * (C) Copyright TOSHIBA CORPORATION 2005-2007
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>
20 #include <asm/txx9/tx4938.h>
22 static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
23 unsigned int gbus_clock,
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;
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))
42 /* Address-valid to DIOR/DIOW setup */
43 shwt = DIV_ROUND_UP(t->setup, cycle);
45 /* -DIOx recovery time (SHWT * 4) and cycle time requirement */
46 while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
49 pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
52 pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
53 ebus_ch, cycle, wt, shwt);
55 __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
56 &tx4938_ebuscptr->cr[ebus_ch]);
59 static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
61 ide_hwif_t *hwif = drive->hwif;
62 struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
66 pair = ide_get_pair_dev(drive);
68 safe = min(safe, ide_get_best_pio_mode(pair, 255, 5));
69 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
74 /* custom iops (independent from SWAP_IO_SPACE) */
75 static void tx4938ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
76 void *buf, unsigned int len)
78 unsigned long port = drive->hwif->io_ports.data_addr;
79 unsigned short *ptr = buf;
80 unsigned int count = (len + 1) / 2;
83 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
84 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
87 static void tx4938ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
88 void *buf, unsigned int len)
90 unsigned long port = drive->hwif->io_ports.data_addr;
91 unsigned short *ptr = buf;
92 unsigned int count = (len + 1) / 2;
95 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
98 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
101 static const struct ide_tp_ops tx4938ide_tp_ops = {
102 .exec_command = ide_exec_command,
103 .read_status = ide_read_status,
104 .read_altstatus = ide_read_altstatus,
105 .write_devctl = ide_write_devctl,
107 .dev_select = ide_dev_select,
108 .tf_load = ide_tf_load,
109 .tf_read = ide_tf_read,
111 .input_data = tx4938ide_input_data_swap,
112 .output_data = tx4938ide_output_data_swap,
115 #endif /* __BIG_ENDIAN */
117 static const struct ide_port_ops tx4938ide_port_ops = {
118 .set_pio_mode = tx4938ide_set_pio_mode,
121 static const struct ide_port_info tx4938ide_port_info __initdata = {
122 .port_ops = &tx4938ide_port_ops,
124 .tp_ops = &tx4938ide_tp_ops,
126 .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
127 .pio_mask = ATA_PIO5,
128 .chipset = ide_generic,
131 static int __init tx4938ide_probe(struct platform_device *pdev)
134 hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
135 struct ide_host *host;
136 struct resource *res;
137 struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
139 unsigned long mapbase, mapctl;
140 struct ide_port_info d = tx4938ide_port_info;
142 irq = platform_get_irq(pdev, 0);
145 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
149 if (!devm_request_mem_region(&pdev->dev, res->start,
150 res->end - res->start + 1, "tx4938ide"))
152 mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
153 8 << pdata->ioport_shift);
154 mapctl = (unsigned long)devm_ioremap(&pdev->dev,
155 res->start + 0x10000 +
156 (6 << pdata->ioport_shift),
157 1 << pdata->ioport_shift);
158 if (!mapbase || !mapctl)
161 memset(&hw, 0, sizeof(hw));
162 if (pdata->ioport_shift) {
163 unsigned long port = mapbase;
164 unsigned long ctl = mapctl;
166 hw.io_ports_array[0] = port;
171 for (i = 1; i <= 7; i++)
172 hw.io_ports_array[i] =
173 port + (i << pdata->ioport_shift);
174 hw.io_ports.ctl_addr = ctl;
176 ide_std_init_ports(&hw, mapbase, mapctl);
180 pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
181 mapbase, mapctl, hw.irq);
182 if (pdata->gbus_clock)
183 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
186 ret = ide_host_add(&d, hws, &host);
188 platform_set_drvdata(pdev, host);
192 static int __exit tx4938ide_remove(struct platform_device *pdev)
194 struct ide_host *host = platform_get_drvdata(pdev);
196 ide_host_remove(host);
200 static struct platform_driver tx4938ide_driver = {
203 .owner = THIS_MODULE,
205 .remove = __exit_p(tx4938ide_remove),
208 static int __init tx4938ide_init(void)
210 return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
213 static void __exit tx4938ide_exit(void)
215 platform_driver_unregister(&tx4938ide_driver);
218 module_init(tx4938ide_init);
219 module_exit(tx4938ide_exit);
221 MODULE_DESCRIPTION("TX4938 internal IDE driver");
222 MODULE_LICENSE("GPL");
223 MODULE_ALIAS("platform:tx4938ide");