Messages in this thread Patch in this message | | | From | Bjorn Helgaas <> | Subject | [PATCH] ACPI-based floppy controller enumeration | Date | Wed, 18 Aug 2004 16:13:56 -0600 |
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Add ACPI-based floppy controller enumeration. This fixes one problem exposed when I removed the unconditional ACPI PCI IRQ routing.
ACPI-based enumeration can be disabled with "floppy=no_acpi". That should only be required if your BIOS supplies incorrect ACPI _CRS information about I/O ports, IRQs, or DMA channels.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
===== Documentation/floppy.txt 1.1 vs edited ===== --- 1.1/Documentation/floppy.txt 2002-02-05 10:40:38 -07:00 +++ edited/Documentation/floppy.txt 2004-08-18 15:41:37 -06:00 @@ -187,6 +187,11 @@ It's been recommended that take about 1/4 of the default speed in some more extreme cases." + floppy=no_acpi + Don't enumerate floppy controllers using ACPI namespace. + You may need this if your ACPI is buggy and reports incorrect + I/O port, IRQ, or DMA information. + Supporting utilities and additional documentation: ===== drivers/block/floppy.c 1.103 vs edited ===== --- 1.103/drivers/block/floppy.c 2004-08-02 02:00:45 -06:00 +++ edited/drivers/block/floppy.c 2004-08-18 15:54:41 -06:00 @@ -181,6 +181,13 @@ #include <linux/device.h> #include <linux/buffer_head.h> /* for invalidate_buffers() */ +#ifdef CONFIG_ACPI_BUS +#include <linux/acpi.h> +#include <acpi/acpi_bus.h> + +static int no_acpi; +#endif + /* * PS/2 floppies have much slower step rates than regular floppies. * It's been recommended that take about 1/4 of the default speed @@ -4150,6 +4157,9 @@ {"slow", NULL, &slow_floppy, 1, 0}, {"unexpected_interrupts", NULL, &print_unex, 1, 0}, {"no_unexpected_interrupts", NULL, &print_unex, 0, 0}, +#ifdef CONFIG_ACPI_BUS + {"no_acpi", NULL, &no_acpi, 1, 0}, +#endif {"L40SX", NULL, &print_unex, 0, 0} EXTRA_FLOPPY_PARAMS @@ -4222,10 +4232,123 @@ return get_disk(disks[drive]); } +#ifdef CONFIG_ACPI_BUS +static int acpi_floppies; + +struct floppy_resources { + unsigned int port; + unsigned int nr_ports; + unsigned int irq; + unsigned int dma_channel; +}; + +static acpi_status acpi_floppy_resource(struct acpi_resource *res, void *data) +{ + struct floppy_resources *floppy = (struct floppy_resources *) data; + struct acpi_resource_io *io; + struct acpi_resource_irq *irq; + struct acpi_resource_ext_irq *ext_irq; + struct acpi_resource_dma *dma; + + if (res->id == ACPI_RSTYPE_IO) { + io = &res->data.io; + if (io->range_length) { + floppy->port = io->min_base_address; + floppy->nr_ports = io->range_length; + } + } else if (res->id == ACPI_RSTYPE_IRQ) { + irq = &res->data.irq; + if (irq->number_of_interrupts > 0) + floppy->irq = acpi_register_gsi(irq->interrupts[0], + irq->edge_level, irq->active_high_low); + } else if (res->id == ACPI_RSTYPE_EXT_IRQ) { + ext_irq = &res->data.extended_irq; + if (ext_irq->number_of_interrupts > 0) + floppy->irq = acpi_register_gsi(ext_irq->interrupts[0], + ext_irq->edge_level, ext_irq->active_high_low); + } else if (res->id == ACPI_RSTYPE_DMA) { + dma = &res->data.dma; + if (dma->number_of_channels > 0) + floppy->dma_channel = dma->channels[0]; + } + return AE_OK; +} + +static int acpi_floppy_add(struct acpi_device *device) +{ + struct floppy_resources floppy; + acpi_status status; + + memset(&floppy, 0, sizeof(floppy)); + status = acpi_walk_resources(device->handle, METHOD_NAME__CRS, + acpi_floppy_resource, &floppy); + if (ACPI_FAILURE(status)) + return -ENODEV; + + printk("%s: controller ACPI %s at I/O 0x%x-0x%x irq %d dma channel %d\n", + DEVICE_NAME, device->pnp.bus_id, + floppy.port, floppy.port + floppy.nr_ports - 1, + floppy.irq, floppy.dma_channel); + + /* + * The driver assumes I/O port regions like 0x3f0-0x3f5, but it + * ignores the first two ports (i.e., 0x3f0 and 0x3f1), which are + * for PS/2 systems. Since no PS/2 systems have ACPI, we should + * get a region like 0x3f2-0x3f5, so we adjust it down to what the + * driver expects. + */ + acpi_floppies++; + if (acpi_floppies == 1) { + FDC1 = floppy.port - 2; + FLOPPY_IRQ = floppy.irq; + FLOPPY_DMA = floppy.dma_channel; + } else if (acpi_floppies == 2) { + FDC2 = floppy.port - 2; + if (floppy.irq != FLOPPY_IRQ || floppy.dma_channel != FLOPPY_DMA) + printk(KERN_WARNING "%s: different IRQ/DMA info for %s; may not work\n", + DEVICE_NAME, device->pnp.bus_id); + } else { + printk(KERN_ERR "%s: only 2 controllers supported; %s ignored\n", + DEVICE_NAME, device->pnp.bus_id); + return -ENODEV; + } + + return 0; +} + +static int acpi_floppy_remove(struct acpi_device *device, int type) +{ + printk(KERN_ERR "%s: remove ACPI %s not supported\n", DEVICE_NAME, + device->pnp.bus_id); + return -EINVAL; +} + +static struct acpi_driver acpi_floppy_driver = { + .name = "floppy", + .ids = "PNP0700", + .ops = { + .add = acpi_floppy_add, + .remove = acpi_floppy_remove, + }, +}; + +static int acpi_floppy_init(void) +{ + if (no_acpi) + return -ENODEV; + return acpi_bus_register_driver(&acpi_floppy_driver); +} +#endif + int __init floppy_init(void) { int i, unit, drive; int err, dr; + +#ifdef CONFIG_ACPI_BUS + if (acpi_floppy_init() == 0) + return -ENODEV; +#endif raw_cmd = NULL; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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