diff options
Diffstat (limited to 'drivers/ide/gayle.c')
| -rw-r--r-- | drivers/ide/gayle.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/ide/gayle.c b/drivers/ide/gayle.c new file mode 100644 index 00000000..51beb852 --- /dev/null +++ b/drivers/ide/gayle.c @@ -0,0 +1,202 @@ +/* + * Amiga Gayle IDE Driver + * + * Created 9 Jul 1997 by Geert Uytterhoeven + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + */ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/blkdev.h> +#include <linux/ide.h> +#include <linux/init.h> +#include <linux/zorro.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#include <asm/setup.h> +#include <asm/amigahw.h> +#include <asm/amigaints.h> +#include <asm/amigayle.h> + + + /* + * Offsets from one of the above bases + */ + +#define GAYLE_CONTROL 0x101a + + /* + * These are at different offsets from the base + */ + +#define GAYLE_IRQ_4000 0xdd3020 /* MSB = 1, Harddisk is source of */ +#define GAYLE_IRQ_1200 0xda9000 /* interrupt */ + + + /* + * Offset of the secondary port for IDE doublers + * Note that GAYLE_CONTROL is NOT available then! + */ + +#define GAYLE_NEXT_PORT 0x1000 + +#define GAYLE_NUM_HWIFS 2 +#define GAYLE_NUM_PROBE_HWIFS (ide_doubler ? GAYLE_NUM_HWIFS : \ + GAYLE_NUM_HWIFS-1) +#define GAYLE_HAS_CONTROL_REG (!ide_doubler) + +static bool ide_doubler; +module_param_named(doubler, ide_doubler, bool, 0); +MODULE_PARM_DESC(doubler, "enable support for IDE doublers"); + + /* + * Check and acknowledge the interrupt status + */ + +static int gayle_test_irq(ide_hwif_t *hwif) +{ + unsigned char ch; + + ch = z_readb(hwif->io_ports.irq_addr); + if (!(ch & GAYLE_IRQ_IDE)) + return 0; + return 1; +} + +static void gayle_a1200_clear_irq(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + + (void)z_readb(hwif->io_ports.status_addr); + z_writeb(0x7c, hwif->io_ports.irq_addr); +} + +static void __init gayle_setup_ports(struct ide_hw *hw, unsigned long base, + unsigned long ctl, unsigned long irq_port) +{ + int i; + + memset(hw, 0, sizeof(*hw)); + + hw->io_ports.data_addr = base; + + for (i = 1; i < 8; i++) + hw->io_ports_array[i] = base + 2 + i * 4; + + hw->io_ports.ctl_addr = ctl; + hw->io_ports.irq_addr = irq_port; + + hw->irq = IRQ_AMIGA_PORTS; +} + +static const struct ide_port_ops gayle_a4000_port_ops = { + .test_irq = gayle_test_irq, +}; + +static const struct ide_port_ops gayle_a1200_port_ops = { + .clear_irq = gayle_a1200_clear_irq, + .test_irq = gayle_test_irq, +}; + +static const struct ide_port_info gayle_port_info = { + .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE | + IDE_HFLAG_NO_DMA, + .irq_flags = IRQF_SHARED, + .chipset = ide_generic, +}; + + /* + * Probe for a Gayle IDE interface (and optionally for an IDE doubler) + */ + +static int __init amiga_gayle_ide_probe(struct platform_device *pdev) +{ + struct resource *res; + struct gayle_ide_platform_data *pdata; + unsigned long base, ctrlport, irqport; + unsigned int i; + int error; + struct ide_hw hw[GAYLE_NUM_HWIFS], *hws[GAYLE_NUM_HWIFS]; + struct ide_port_info d = gayle_port_info; + struct ide_host *host; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + if (!request_mem_region(res->start, resource_size(res), "IDE")) + return -EBUSY; + + pdata = pdev->dev.platform_data; + pr_info("ide: Gayle IDE controller (A%u style%s)\n", + pdata->explicit_ack ? 1200 : 4000, + ide_doubler ? ", IDE doubler" : ""); + + base = (unsigned long)ZTWO_VADDR(pdata->base); + ctrlport = 0; + irqport = (unsigned long)ZTWO_VADDR(pdata->irqport); + if (pdata->explicit_ack) + d.port_ops = &gayle_a1200_port_ops; + else + d.port_ops = &gayle_a4000_port_ops; + + for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++, base += GAYLE_NEXT_PORT) { + if (GAYLE_HAS_CONTROL_REG) + ctrlport = base + GAYLE_CONTROL; + + gayle_setup_ports(&hw[i], base, ctrlport, irqport); + hws[i] = &hw[i]; + } + + error = ide_host_add(&d, hws, i, &host); + if (error) + goto out; + + platform_set_drvdata(pdev, host); + return 0; + +out: + release_mem_region(res->start, resource_size(res)); + return error; +} + +static int __exit amiga_gayle_ide_remove(struct platform_device *pdev) +{ + struct ide_host *host = platform_get_drvdata(pdev); + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + ide_host_remove(host); + release_mem_region(res->start, resource_size(res)); + return 0; +} + +static struct platform_driver amiga_gayle_ide_driver = { + .remove = __exit_p(amiga_gayle_ide_remove), + .driver = { + .name = "amiga-gayle-ide", + .owner = THIS_MODULE, + }, +}; + +static int __init amiga_gayle_ide_init(void) +{ + return platform_driver_probe(&amiga_gayle_ide_driver, + amiga_gayle_ide_probe); +} + +module_init(amiga_gayle_ide_init); + +static void __exit amiga_gayle_ide_exit(void) +{ + platform_driver_unregister(&amiga_gayle_ide_driver); +} + +module_exit(amiga_gayle_ide_exit); + +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:amiga-gayle-ide"); |