| 1 | /* |
| 2 | * Atari Falcon IDE Driver |
| 3 | * |
| 4 | * Created 12 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/module.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/mm.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/blkdev.h> |
| 16 | #include <linux/ide.h> |
| 17 | #include <linux/init.h> |
| 18 | |
| 19 | #include <asm/setup.h> |
| 20 | #include <asm/atarihw.h> |
| 21 | #include <asm/atariints.h> |
| 22 | #include <asm/atari_stdma.h> |
| 23 | #include <asm/ide.h> |
| 24 | |
| 25 | #define DRV_NAME "falconide" |
| 26 | |
| 27 | /* |
| 28 | * Base of the IDE interface |
| 29 | */ |
| 30 | |
| 31 | #define ATA_HD_BASE 0xfff00000 |
| 32 | |
| 33 | /* |
| 34 | * Offsets from the above base |
| 35 | */ |
| 36 | |
| 37 | #define ATA_HD_CONTROL 0x39 |
| 38 | |
| 39 | /* |
| 40 | * falconide_intr_lock is used to obtain access to the IDE interrupt, |
| 41 | * which is shared between several drivers. |
| 42 | */ |
| 43 | |
| 44 | static int falconide_intr_lock; |
| 45 | |
| 46 | static void falconide_release_lock(void) |
| 47 | { |
| 48 | if (falconide_intr_lock == 0) { |
| 49 | printk(KERN_ERR "%s: bug\n", __func__); |
| 50 | return; |
| 51 | } |
| 52 | falconide_intr_lock = 0; |
| 53 | stdma_release(); |
| 54 | } |
| 55 | |
| 56 | static void falconide_get_lock(irq_handler_t handler, void *data) |
| 57 | { |
| 58 | if (falconide_intr_lock == 0) { |
| 59 | if (in_interrupt() > 0) |
| 60 | panic("Falcon IDE hasn't ST-DMA lock in interrupt"); |
| 61 | stdma_lock(handler, data); |
| 62 | falconide_intr_lock = 1; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, |
| 67 | void *buf, unsigned int len) |
| 68 | { |
| 69 | unsigned long data_addr = drive->hwif->io_ports.data_addr; |
| 70 | |
| 71 | if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) { |
| 72 | __ide_mm_insw(data_addr, buf, (len + 1) / 2); |
| 73 | return; |
| 74 | } |
| 75 | |
| 76 | raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2); |
| 77 | } |
| 78 | |
| 79 | static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, |
| 80 | void *buf, unsigned int len) |
| 81 | { |
| 82 | unsigned long data_addr = drive->hwif->io_ports.data_addr; |
| 83 | |
| 84 | if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) { |
| 85 | __ide_mm_outsw(data_addr, buf, (len + 1) / 2); |
| 86 | return; |
| 87 | } |
| 88 | |
| 89 | raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2); |
| 90 | } |
| 91 | |
| 92 | /* Atari has a byte-swapped IDE interface */ |
| 93 | static const struct ide_tp_ops falconide_tp_ops = { |
| 94 | .exec_command = ide_exec_command, |
| 95 | .read_status = ide_read_status, |
| 96 | .read_altstatus = ide_read_altstatus, |
| 97 | .write_devctl = ide_write_devctl, |
| 98 | |
| 99 | .dev_select = ide_dev_select, |
| 100 | .tf_load = ide_tf_load, |
| 101 | .tf_read = ide_tf_read, |
| 102 | |
| 103 | .input_data = falconide_input_data, |
| 104 | .output_data = falconide_output_data, |
| 105 | }; |
| 106 | |
| 107 | static const struct ide_port_info falconide_port_info = { |
| 108 | .get_lock = falconide_get_lock, |
| 109 | .release_lock = falconide_release_lock, |
| 110 | .tp_ops = &falconide_tp_ops, |
| 111 | .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE | |
| 112 | IDE_HFLAG_NO_DMA, |
| 113 | .irq_flags = IRQF_SHARED, |
| 114 | .chipset = ide_generic, |
| 115 | }; |
| 116 | |
| 117 | static void __init falconide_setup_ports(struct ide_hw *hw) |
| 118 | { |
| 119 | int i; |
| 120 | |
| 121 | memset(hw, 0, sizeof(*hw)); |
| 122 | |
| 123 | hw->io_ports.data_addr = ATA_HD_BASE; |
| 124 | |
| 125 | for (i = 1; i < 8; i++) |
| 126 | hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4; |
| 127 | |
| 128 | hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL; |
| 129 | |
| 130 | hw->irq = IRQ_MFP_IDE; |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * Probe for a Falcon IDE interface |
| 135 | */ |
| 136 | |
| 137 | static int __init falconide_init(void) |
| 138 | { |
| 139 | struct ide_host *host; |
| 140 | struct ide_hw hw, *hws[] = { &hw }; |
| 141 | int rc; |
| 142 | |
| 143 | if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE)) |
| 144 | return -ENODEV; |
| 145 | |
| 146 | printk(KERN_INFO "ide: Falcon IDE controller\n"); |
| 147 | |
| 148 | if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) { |
| 149 | printk(KERN_ERR "%s: resources busy\n", DRV_NAME); |
| 150 | return -EBUSY; |
| 151 | } |
| 152 | |
| 153 | falconide_setup_ports(&hw); |
| 154 | |
| 155 | host = ide_host_alloc(&falconide_port_info, hws, 1); |
| 156 | if (host == NULL) { |
| 157 | rc = -ENOMEM; |
| 158 | goto err; |
| 159 | } |
| 160 | |
| 161 | falconide_get_lock(NULL, NULL); |
| 162 | rc = ide_host_register(host, &falconide_port_info, hws); |
| 163 | falconide_release_lock(); |
| 164 | |
| 165 | if (rc) |
| 166 | goto err_free; |
| 167 | |
| 168 | return 0; |
| 169 | err_free: |
| 170 | ide_host_free(host); |
| 171 | err: |
| 172 | release_mem_region(ATA_HD_BASE, 0x40); |
| 173 | return rc; |
| 174 | } |
| 175 | |
| 176 | module_init(falconide_init); |
| 177 | |
| 178 | MODULE_LICENSE("GPL"); |