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
tx4938ide_tune_ebusc(unsigned int ebus_ch,unsigned int gbus_clock,u8 pio)22 static 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_warn("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
tx4938ide_set_pio_mode(ide_hwif_t * hwif,ide_drive_t * drive)59 static void tx4938ide_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
60 {
61 struct tx4938ide_platform_info *pdata = dev_get_platdata(hwif->dev);
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) */
tx4938ide_input_data_swap(ide_drive_t * drive,struct ide_cmd * cmd,void * buf,unsigned int len)74 static 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
tx4938ide_output_data_swap(ide_drive_t * drive,struct ide_cmd * cmd,void * buf,unsigned int len)86 static 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
100 static 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
116 static const struct ide_port_ops tx4938ide_port_ops = {
117 .set_pio_mode = tx4938ide_set_pio_mode,
118 };
119
120 static const struct ide_port_info tx4938ide_port_info __initconst = {
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
tx4938ide_probe(struct platform_device * pdev)130 static 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 = dev_get_platdata(&pdev->dev);
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
tx4938ide_remove(struct platform_device * pdev)190 static 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
198 static struct platform_driver tx4938ide_driver = {
199 .driver = {
200 .name = "tx4938ide",
201 },
202 .remove = __exit_p(tx4938ide_remove),
203 };
204
205 module_platform_driver_probe(tx4938ide_driver, tx4938ide_probe);
206
207 MODULE_DESCRIPTION("TX4938 internal IDE driver");
208 MODULE_LICENSE("GPL");
209 MODULE_ALIAS("platform:tx4938ide");
210