diff options
Diffstat (limited to 'drivers/ide/falconide.c')
| -rw-r--r-- | drivers/ide/falconide.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/drivers/ide/falconide.c b/drivers/ide/falconide.c new file mode 100644 index 00000000..a5a07ccb --- /dev/null +++ b/drivers/ide/falconide.c @@ -0,0 +1,178 @@ +/* + * Atari Falcon IDE Driver + * + * Created 12 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/module.h> +#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 <asm/setup.h> +#include <asm/atarihw.h> +#include <asm/atariints.h> +#include <asm/atari_stdma.h> +#include <asm/ide.h> + +#define DRV_NAME "falconide" + + /* + * Base of the IDE interface + */ + +#define ATA_HD_BASE 0xfff00000 + + /* + * Offsets from the above base + */ + +#define ATA_HD_CONTROL 0x39 + + /* + * falconide_intr_lock is used to obtain access to the IDE interrupt, + * which is shared between several drivers. + */ + +static int falconide_intr_lock; + +static void falconide_release_lock(void) +{ + if (falconide_intr_lock == 0) { + printk(KERN_ERR "%s: bug\n", __func__); + return; + } + falconide_intr_lock = 0; + stdma_release(); +} + +static void falconide_get_lock(irq_handler_t handler, void *data) +{ + if (falconide_intr_lock == 0) { + if (in_interrupt() > 0) + panic("Falcon IDE hasn't ST-DMA lock in interrupt"); + stdma_lock(handler, data); + falconide_intr_lock = 1; + } +} + +static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, + void *buf, unsigned int len) +{ + unsigned long data_addr = drive->hwif->io_ports.data_addr; + + if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) { + __ide_mm_insw(data_addr, buf, (len + 1) / 2); + return; + } + + raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2); +} + +static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, + void *buf, unsigned int len) +{ + unsigned long data_addr = drive->hwif->io_ports.data_addr; + + if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) { + __ide_mm_outsw(data_addr, buf, (len + 1) / 2); + return; + } + + raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2); +} + +/* Atari has a byte-swapped IDE interface */ +static const struct ide_tp_ops falconide_tp_ops = { + .exec_command = ide_exec_command, + .read_status = ide_read_status, + .read_altstatus = ide_read_altstatus, + .write_devctl = ide_write_devctl, + + .dev_select = ide_dev_select, + .tf_load = ide_tf_load, + .tf_read = ide_tf_read, + + .input_data = falconide_input_data, + .output_data = falconide_output_data, +}; + +static const struct ide_port_info falconide_port_info = { + .get_lock = falconide_get_lock, + .release_lock = falconide_release_lock, + .tp_ops = &falconide_tp_ops, + .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE | + IDE_HFLAG_NO_DMA, + .irq_flags = IRQF_SHARED, + .chipset = ide_generic, +}; + +static void __init falconide_setup_ports(struct ide_hw *hw) +{ + int i; + + memset(hw, 0, sizeof(*hw)); + + hw->io_ports.data_addr = ATA_HD_BASE; + + for (i = 1; i < 8; i++) + hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4; + + hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL; + + hw->irq = IRQ_MFP_IDE; +} + + /* + * Probe for a Falcon IDE interface + */ + +static int __init falconide_init(void) +{ + struct ide_host *host; + struct ide_hw hw, *hws[] = { &hw }; + int rc; + + if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE)) + return -ENODEV; + + printk(KERN_INFO "ide: Falcon IDE controller\n"); + + if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) { + printk(KERN_ERR "%s: resources busy\n", DRV_NAME); + return -EBUSY; + } + + falconide_setup_ports(&hw); + + host = ide_host_alloc(&falconide_port_info, hws, 1); + if (host == NULL) { + rc = -ENOMEM; + goto err; + } + + falconide_get_lock(NULL, NULL); + rc = ide_host_register(host, &falconide_port_info, hws); + falconide_release_lock(); + + if (rc) + goto err_free; + + return 0; +err_free: + ide_host_free(host); +err: + release_mem_region(ATA_HD_BASE, 0x40); + return rc; +} + +module_init(falconide_init); + +MODULE_LICENSE("GPL"); |