diff options
Diffstat (limited to 'arch/sh/drivers/pci/ops-dreamcast.c')
| -rw-r--r-- | arch/sh/drivers/pci/ops-dreamcast.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/arch/sh/drivers/pci/ops-dreamcast.c b/arch/sh/drivers/pci/ops-dreamcast.c new file mode 100644 index 00000000000..69af80b93e3 --- /dev/null +++ b/arch/sh/drivers/pci/ops-dreamcast.c @@ -0,0 +1,169 @@ +/* + * arch/sh/pci/ops-dreamcast.c + * + * PCI operations for the Sega Dreamcast + * + * Copyright (C) 2001, 2002 M. R. Brown + * Copyright (C) 2002, 2003 Paul Mundt + * + * This file originally bore the message (with enclosed-$): + * Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp + * Dreamcast PCI: Supports SEGA Broadband Adaptor only. + * + * 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/config.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/param.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/pci.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/mach/pci.h> + +static struct resource gapspci_io_resource = { + .name = "GAPSPCI IO", + .start = GAPSPCI_BBA_CONFIG, + .end = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1, + .flags = IORESOURCE_IO, +}; + +static struct resource gapspci_mem_resource = { + .name = "GAPSPCI mem", + .start = GAPSPCI_DMA_BASE, + .end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1, + .flags = IORESOURCE_MEM, +}; + +static struct pci_ops gapspci_pci_ops; + +struct pci_channel board_pci_channels[] = { + { &gapspci_pci_ops, &gapspci_io_resource, + &gapspci_mem_resource, 0, 1 }, + { 0, } +}; + +/* + * The !gapspci_config_access case really shouldn't happen, ever, unless + * someone implicitly messes around with the last devfn value.. otherwise we + * only support a single device anyways, and if we didn't have a BBA, we + * wouldn't make it terribly far through the PCI setup anyways. + * + * Also, we could very easily support both Type 0 and Type 1 configurations + * here, but since it doesn't seem that there is any such implementation in + * existance, we don't bother. + * + * I suppose if someone actually gets around to ripping the chip out of + * the BBA and hanging some more devices off of it, then this might be + * something to take into consideration. However, due to the cost of the BBA, + * and the general lack of activity by DC hardware hackers, this doesn't seem + * likely to happen anytime soon. + */ +static int gapspci_config_access(unsigned char bus, unsigned int devfn) +{ + return (bus == 0) && (devfn == 0); +} + +/* + * We can also actually read and write in b/w/l sizes! Thankfully this part + * was at least done right, and we don't have to do the stupid masking and + * shifting that we do on the 7751! Small wonders never cease to amaze. + */ +static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) +{ + *val = 0xffffffff; + + if (!gapspci_config_access(bus->number, devfn)) + return PCIBIOS_DEVICE_NOT_FOUND; + + switch (size) { + case 1: *val = inb(GAPSPCI_BBA_CONFIG+where); break; + case 2: *val = inw(GAPSPCI_BBA_CONFIG+where); break; + case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) +{ + if (!gapspci_config_access(bus->number, devfn)) + return PCIBIOS_DEVICE_NOT_FOUND; + + switch (size) { + case 1: outb(( u8)val, GAPSPCI_BBA_CONFIG+where); break; + case 2: outw((u16)val, GAPSPCI_BBA_CONFIG+where); break; + case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops gapspci_pci_ops = { + .read = gapspci_read, + .write = gapspci_write, +}; + +/* + * gapspci init + */ + +int __init gapspci_init(void) +{ + char idbuf[16]; + int i; + + /* + * FIXME: All of this wants documenting to some degree, + * even some basic register definitions would be nice. + * + * I haven't seen anything this ugly since.. maple. + */ + + for (i=0; i<16; i++) + idbuf[i] = inb(GAPSPCI_REGS+i); + + if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16)) + return -ENODEV; + + outl(0x5a14a501, GAPSPCI_REGS+0x18); + + for (i=0; i<1000000; i++) + ; + + if (inl(GAPSPCI_REGS+0x18) != 1) + return -EINVAL; + + outl(0x01000000, GAPSPCI_REGS+0x20); + outl(0x01000000, GAPSPCI_REGS+0x24); + + outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28); + outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c); + + outl(1, GAPSPCI_REGS+0x14); + outl(1, GAPSPCI_REGS+0x34); + + /* Setting Broadband Adapter */ + outw(0xf900, GAPSPCI_BBA_CONFIG+0x06); + outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30); + outb(0x00, GAPSPCI_BBA_CONFIG+0x3c); + outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d); + outw(0x0006, GAPSPCI_BBA_CONFIG+0x04); + outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10); + outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14); + + return 0; +} + +/* Haven't done anything here as yet */ +char * __devinit pcibios_setup(char *str) +{ + return str; +} |