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Linux/drivers/ide/gayle.c

  1 /*
  2  *  Amiga Gayle IDE Driver
  3  *
  4  *     Created 9 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/types.h>
 12 #include <linux/mm.h>
 13 #include <linux/interrupt.h>
 14 #include <linux/blkdev.h>
 15 #include <linux/ide.h>
 16 #include <linux/init.h>
 17 #include <linux/zorro.h>
 18 #include <linux/module.h>
 19 #include <linux/platform_device.h>
 20 
 21 #include <asm/setup.h>
 22 #include <asm/amigahw.h>
 23 #include <asm/amigaints.h>
 24 #include <asm/amigayle.h>
 25 
 26 
 27     /*
 28      *  Offsets from one of the above bases
 29      */
 30 
 31 #define GAYLE_CONTROL   0x101a
 32 
 33     /*
 34      *  These are at different offsets from the base
 35      */
 36 
 37 #define GAYLE_IRQ_4000  0xdd3020        /* MSB = 1, Harddisk is source of */
 38 #define GAYLE_IRQ_1200  0xda9000        /* interrupt */
 39 
 40 
 41     /*
 42      *  Offset of the secondary port for IDE doublers
 43      *  Note that GAYLE_CONTROL is NOT available then!
 44      */
 45 
 46 #define GAYLE_NEXT_PORT 0x1000
 47 
 48 #define GAYLE_NUM_HWIFS         2
 49 #define GAYLE_NUM_PROBE_HWIFS   (ide_doubler ? GAYLE_NUM_HWIFS : \
 50                                                GAYLE_NUM_HWIFS-1)
 51 #define GAYLE_HAS_CONTROL_REG   (!ide_doubler)
 52 
 53 static bool ide_doubler;
 54 module_param_named(doubler, ide_doubler, bool, 0);
 55 MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
 56 
 57     /*
 58      *  Check and acknowledge the interrupt status
 59      */
 60 
 61 static int gayle_test_irq(ide_hwif_t *hwif)
 62 {
 63         unsigned char ch;
 64 
 65         ch = z_readb(hwif->io_ports.irq_addr);
 66         if (!(ch & GAYLE_IRQ_IDE))
 67                 return 0;
 68         return 1;
 69 }
 70 
 71 static void gayle_a1200_clear_irq(ide_drive_t *drive)
 72 {
 73         ide_hwif_t *hwif = drive->hwif;
 74 
 75         (void)z_readb(hwif->io_ports.status_addr);
 76         z_writeb(0x7c, hwif->io_ports.irq_addr);
 77 }
 78 
 79 static void __init gayle_setup_ports(struct ide_hw *hw, unsigned long base,
 80                                      unsigned long ctl, unsigned long irq_port)
 81 {
 82         int i;
 83 
 84         memset(hw, 0, sizeof(*hw));
 85 
 86         hw->io_ports.data_addr = base;
 87 
 88         for (i = 1; i < 8; i++)
 89                 hw->io_ports_array[i] = base + 2 + i * 4;
 90 
 91         hw->io_ports.ctl_addr = ctl;
 92         hw->io_ports.irq_addr = irq_port;
 93 
 94         hw->irq = IRQ_AMIGA_PORTS;
 95 }
 96 
 97 static const struct ide_port_ops gayle_a4000_port_ops = {
 98         .test_irq               = gayle_test_irq,
 99 };
100 
101 static const struct ide_port_ops gayle_a1200_port_ops = {
102         .clear_irq              = gayle_a1200_clear_irq,
103         .test_irq               = gayle_test_irq,
104 };
105 
106 static const struct ide_port_info gayle_port_info = {
107         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
108                                   IDE_HFLAG_NO_DMA,
109         .irq_flags              = IRQF_SHARED,
110         .chipset                = ide_generic,
111 };
112 
113     /*
114      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
115      */
116 
117 static int __init amiga_gayle_ide_probe(struct platform_device *pdev)
118 {
119         struct resource *res;
120         struct gayle_ide_platform_data *pdata;
121         unsigned long base, ctrlport, irqport;
122         unsigned int i;
123         int error;
124         struct ide_hw hw[GAYLE_NUM_HWIFS], *hws[GAYLE_NUM_HWIFS];
125         struct ide_port_info d = gayle_port_info;
126         struct ide_host *host;
127 
128         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
129         if (!res)
130                 return -ENODEV;
131 
132         if (!request_mem_region(res->start, resource_size(res), "IDE"))
133                 return -EBUSY;
134 
135         pdata = dev_get_platdata(&pdev->dev);
136         pr_info("ide: Gayle IDE controller (A%u style%s)\n",
137                 pdata->explicit_ack ? 1200 : 4000,
138                 ide_doubler ? ", IDE doubler" : "");
139 
140         base = (unsigned long)ZTWO_VADDR(pdata->base);
141         ctrlport = 0;
142         irqport = (unsigned long)ZTWO_VADDR(pdata->irqport);
143         if (pdata->explicit_ack)
144                 d.port_ops = &gayle_a1200_port_ops;
145         else
146                 d.port_ops = &gayle_a4000_port_ops;
147 
148         for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++, base += GAYLE_NEXT_PORT) {
149                 if (GAYLE_HAS_CONTROL_REG)
150                         ctrlport = base + GAYLE_CONTROL;
151 
152                 gayle_setup_ports(&hw[i], base, ctrlport, irqport);
153                 hws[i] = &hw[i];
154         }
155 
156         error = ide_host_add(&d, hws, i, &host);
157         if (error)
158                 goto out;
159 
160         platform_set_drvdata(pdev, host);
161         return 0;
162 
163 out:
164         release_mem_region(res->start, resource_size(res));
165         return error;
166 }
167 
168 static int __exit amiga_gayle_ide_remove(struct platform_device *pdev)
169 {
170         struct ide_host *host = platform_get_drvdata(pdev);
171         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
172 
173         ide_host_remove(host);
174         release_mem_region(res->start, resource_size(res));
175         return 0;
176 }
177 
178 static struct platform_driver amiga_gayle_ide_driver = {
179         .remove = __exit_p(amiga_gayle_ide_remove),
180         .driver   = {
181                 .name   = "amiga-gayle-ide",
182                 .owner  = THIS_MODULE,
183         },
184 };
185 
186 module_platform_driver_probe(amiga_gayle_ide_driver, amiga_gayle_ide_probe);
187 
188 MODULE_LICENSE("GPL");
189 MODULE_ALIAS("platform:amiga-gayle-ide");
190 

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