Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/ide/tx4938ide.c

  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 
 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_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 
 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) */
 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 
 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 
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 
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                 .owner  = THIS_MODULE,
202         },
203         .remove = __exit_p(tx4938ide_remove),
204 };
205 
206 module_platform_driver_probe(tx4938ide_driver, tx4938ide_probe);
207 
208 MODULE_DESCRIPTION("TX4938 internal IDE driver");
209 MODULE_LICENSE("GPL");
210 MODULE_ALIAS("platform:tx4938ide");
211 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us