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199 lines
4.5 KiB
199 lines
4.5 KiB
/* |
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* Atari Falcon IDE Driver |
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* |
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* Created 12 Jul 1997 by Geert Uytterhoeven |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive for |
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* more details. |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <linux/blkdev.h> |
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#include <linux/ide.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <asm/setup.h> |
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#include <asm/atarihw.h> |
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#include <asm/atariints.h> |
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#include <asm/atari_stdma.h> |
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#include <asm/ide.h> |
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#define DRV_NAME "falconide" |
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/* |
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* Offsets from base address |
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*/ |
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#define ATA_HD_CONTROL 0x39 |
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/* |
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* falconide_intr_lock is used to obtain access to the IDE interrupt, |
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* which is shared between several drivers. |
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*/ |
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static int falconide_intr_lock; |
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static void falconide_release_lock(void) |
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{ |
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if (falconide_intr_lock == 0) { |
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printk(KERN_ERR "%s: bug\n", __func__); |
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return; |
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} |
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falconide_intr_lock = 0; |
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stdma_release(); |
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} |
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static void falconide_get_lock(irq_handler_t handler, void *data) |
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{ |
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if (falconide_intr_lock == 0) { |
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if (in_interrupt() > 0) |
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panic("Falcon IDE hasn't ST-DMA lock in interrupt"); |
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stdma_lock(handler, data); |
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falconide_intr_lock = 1; |
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} |
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} |
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static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, |
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void *buf, unsigned int len) |
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{ |
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unsigned long data_addr = drive->hwif->io_ports.data_addr; |
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if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) { |
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__ide_mm_insw(data_addr, buf, (len + 1) / 2); |
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return; |
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} |
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raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2); |
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} |
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static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, |
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void *buf, unsigned int len) |
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{ |
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unsigned long data_addr = drive->hwif->io_ports.data_addr; |
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if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) { |
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__ide_mm_outsw(data_addr, buf, (len + 1) / 2); |
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return; |
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} |
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raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2); |
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} |
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/* Atari has a byte-swapped IDE interface */ |
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static const struct ide_tp_ops falconide_tp_ops = { |
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.exec_command = ide_exec_command, |
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.read_status = ide_read_status, |
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.read_altstatus = ide_read_altstatus, |
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.write_devctl = ide_write_devctl, |
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.dev_select = ide_dev_select, |
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.tf_load = ide_tf_load, |
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.tf_read = ide_tf_read, |
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.input_data = falconide_input_data, |
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.output_data = falconide_output_data, |
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}; |
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static const struct ide_port_info falconide_port_info = { |
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.get_lock = falconide_get_lock, |
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.release_lock = falconide_release_lock, |
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.tp_ops = &falconide_tp_ops, |
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.host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE | |
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IDE_HFLAG_NO_DMA, |
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.irq_flags = IRQF_SHARED, |
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.chipset = ide_generic, |
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}; |
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static void __init falconide_setup_ports(struct ide_hw *hw, unsigned long base) |
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{ |
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int i; |
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memset(hw, 0, sizeof(*hw)); |
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hw->io_ports.data_addr = base; |
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for (i = 1; i < 8; i++) |
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hw->io_ports_array[i] = base + 1 + i * 4; |
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hw->io_ports.ctl_addr = base + ATA_HD_CONTROL; |
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hw->irq = IRQ_MFP_IDE; |
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} |
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/* |
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* Probe for a Falcon IDE interface |
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*/ |
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static int __init falconide_init(struct platform_device *pdev) |
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{ |
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struct resource *res; |
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struct ide_host *host; |
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struct ide_hw hw, *hws[] = { &hw }; |
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unsigned long base; |
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int rc; |
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dev_info(&pdev->dev, "Atari Falcon IDE controller\n"); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) |
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return -ENODEV; |
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if (!devm_request_mem_region(&pdev->dev, res->start, |
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resource_size(res), DRV_NAME)) { |
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dev_err(&pdev->dev, "resources busy\n"); |
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return -EBUSY; |
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} |
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base = (unsigned long)res->start; |
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falconide_setup_ports(&hw, base); |
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host = ide_host_alloc(&falconide_port_info, hws, 1); |
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if (host == NULL) { |
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rc = -ENOMEM; |
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goto err; |
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} |
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falconide_get_lock(NULL, NULL); |
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rc = ide_host_register(host, &falconide_port_info, hws); |
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falconide_release_lock(); |
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if (rc) |
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goto err_free; |
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platform_set_drvdata(pdev, host); |
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return 0; |
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err_free: |
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ide_host_free(host); |
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err: |
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release_mem_region(res->start, resource_size(res)); |
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return rc; |
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} |
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static int falconide_remove(struct platform_device *pdev) |
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{ |
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struct ide_host *host = platform_get_drvdata(pdev); |
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ide_host_remove(host); |
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return 0; |
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} |
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static struct platform_driver ide_falcon_driver = { |
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.remove = falconide_remove, |
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.driver = { |
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.name = "atari-falcon-ide", |
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}, |
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}; |
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module_platform_driver_probe(ide_falcon_driver, falconide_init); |
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MODULE_AUTHOR("Geert Uytterhoeven"); |
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MODULE_DESCRIPTION("low-level driver for Atari Falcon IDE"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:atari-falcon-ide");
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