diff options
Diffstat (limited to 'drivers/ide/buddha.c')
| -rw-r--r-- | drivers/ide/buddha.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/ide/buddha.c b/drivers/ide/buddha.c new file mode 100644 index 0000000..c5a3c9e --- /dev/null +++ b/drivers/ide/buddha.c @@ -0,0 +1,235 @@ +/* + * Amiga Buddha, Catweasel and X-Surf IDE Driver + * + * Copyright (C) 1997, 2001 by Geert Uytterhoeven and others + * + * This driver was written based on the specifications in README.buddha and + * the X-Surf info from Inside_XSurf.txt available at + * http://www.jschoenfeld.com + * + * 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. + * + * TODO: + * - test it :-) + * - tune the timings using the speed-register + */ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/blkdev.h> +#include <linux/zorro.h> +#include <linux/ide.h> +#include <linux/init.h> + +#include <asm/amigahw.h> +#include <asm/amigaints.h> + + + /* + * The Buddha has 2 IDE interfaces, the Catweasel has 3, X-Surf has 2 + */ + +#define BUDDHA_NUM_HWIFS 2 +#define CATWEASEL_NUM_HWIFS 3 +#define XSURF_NUM_HWIFS 2 + +#define MAX_NUM_HWIFS 3 + + /* + * Bases of the IDE interfaces (relative to the board address) + */ + +#define BUDDHA_BASE1 0x800 +#define BUDDHA_BASE2 0xa00 +#define BUDDHA_BASE3 0xc00 + +#define XSURF_BASE1 0xb000 /* 2.5" Interface */ +#define XSURF_BASE2 0xd000 /* 3.5" Interface */ + +static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = { + BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3 +}; + +static u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = { + XSURF_BASE1, XSURF_BASE2 +}; + + /* + * Offsets from one of the above bases + */ + +#define BUDDHA_CONTROL 0x11a + + /* + * Other registers + */ + +#define BUDDHA_IRQ1 0xf00 /* MSB = 1, Harddisk is source of */ +#define BUDDHA_IRQ2 0xf40 /* interrupt */ +#define BUDDHA_IRQ3 0xf80 + +#define XSURF_IRQ1 0x7e +#define XSURF_IRQ2 0x7e + +static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = { + BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3 +}; + +static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = { + XSURF_IRQ1, XSURF_IRQ2 +}; + +#define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */ + + + /* + * Board information + */ + +typedef enum BuddhaType_Enum { + BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF +} BuddhaType; + +static const char *buddha_board_name[] = { "Buddha", "Catweasel", "X-Surf" }; + + /* + * Check and acknowledge the interrupt status + */ + +static int buddha_ack_intr(ide_hwif_t *hwif) +{ + unsigned char ch; + + ch = z_readb(hwif->io_ports.irq_addr); + if (!(ch & 0x80)) + return 0; + return 1; +} + +static int xsurf_ack_intr(ide_hwif_t *hwif) +{ + unsigned char ch; + + ch = z_readb(hwif->io_ports.irq_addr); + /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */ + z_writeb(0, hwif->io_ports.irq_addr); + if (!(ch & 0x80)) + return 0; + return 1; +} + +static void __init buddha_setup_ports(hw_regs_t *hw, unsigned long base, + unsigned long ctl, unsigned long irq_port, + ide_ack_intr_t *ack_intr) +{ + 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; + hw->ack_intr = ack_intr; + + hw->chipset = ide_generic; +} + + /* + * Probe for a Buddha or Catweasel IDE interface + */ + +static int __init buddha_init(void) +{ + struct zorro_dev *z = NULL; + u_long buddha_board = 0; + BuddhaType type; + int buddha_num_hwifs, i; + + while ((z = zorro_find_device(ZORRO_WILDCARD, z))) { + unsigned long board; + hw_regs_t hw[MAX_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL }; + + if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) { + buddha_num_hwifs = BUDDHA_NUM_HWIFS; + type=BOARD_BUDDHA; + } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) { + buddha_num_hwifs = CATWEASEL_NUM_HWIFS; + type=BOARD_CATWEASEL; + } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) { + buddha_num_hwifs = XSURF_NUM_HWIFS; + type=BOARD_XSURF; + } else + continue; + + board = z->resource.start; + +/* + * FIXME: we now have selectable mmio v/s iomio transports. + */ + + if(type != BOARD_XSURF) { + if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE")) + continue; + } else { + if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE")) + continue; + if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE")) + goto fail_base2; + if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) { + release_mem_region(board+XSURF_BASE2, 0x1000); +fail_base2: + release_mem_region(board+XSURF_BASE1, 0x1000); + continue; + } + } + buddha_board = ZTWO_VADDR(board); + + /* write to BUDDHA_IRQ_MR to enable the board IRQ */ + /* X-Surf doesn't have this. IRQs are always on */ + if (type != BOARD_XSURF) + z_writeb(0, buddha_board+BUDDHA_IRQ_MR); + + printk(KERN_INFO "ide: %s IDE controller\n", + buddha_board_name[type]); + + for (i = 0; i < buddha_num_hwifs; i++) { + unsigned long base, ctl, irq_port; + ide_ack_intr_t *ack_intr; + + if (type != BOARD_XSURF) { + base = buddha_board + buddha_bases[i]; + ctl = base + BUDDHA_CONTROL; + irq_port = buddha_board + buddha_irqports[i]; + ack_intr = buddha_ack_intr; + } else { + base = buddha_board + xsurf_bases[i]; + /* X-Surf has no CS1* (Control/AltStat) */ + ctl = 0; + irq_port = buddha_board + xsurf_irqports[i]; + ack_intr = xsurf_ack_intr; + } + + buddha_setup_ports(&hw[i], base, ctl, irq_port, + ack_intr); + + hws[i] = &hw[i]; + } + + ide_host_add(NULL, hws, NULL); + } + + return 0; +} + +module_init(buddha_init); + +MODULE_LICENSE("GPL"); |