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| 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 = pdev->dev.platform_data; |
| 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 | static int __init amiga_gayle_ide_init(void) |
| 187 | { |
| 188 | return platform_driver_probe(&amiga_gayle_ide_driver, |
| 189 | amiga_gayle_ide_probe); |
| 190 | } |
| 191 | |
| 192 | module_init(amiga_gayle_ide_init); |
| 193 | |
| 194 | static void __exit amiga_gayle_ide_exit(void) |
| 195 | { |
| 196 | platform_driver_unregister(&amiga_gayle_ide_driver); |
| 197 | } |
| 198 | |
| 199 | module_exit(amiga_gayle_ide_exit); |
| 200 | |
| 201 | MODULE_LICENSE("GPL"); |
| 202 | MODULE_ALIAS("platform:amiga-gayle-ide"); |
| 203 |
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