diff options
Diffstat (limited to 'arch/i386/kernel/mca.c')
| -rw-r--r-- | arch/i386/kernel/mca.c | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/arch/i386/kernel/mca.c b/arch/i386/kernel/mca.c new file mode 100644 index 00000000000..8600faeea29 --- /dev/null +++ b/arch/i386/kernel/mca.c @@ -0,0 +1,474 @@ +/* + * linux/arch/i386/kernel/mca.c + * Written by Martin Kolinek, February 1996 + * + * Changes: + * + * Chris Beauregard July 28th, 1996 + * - Fixed up integrated SCSI detection + * + * Chris Beauregard August 3rd, 1996 + * - Made mca_info local + * - Made integrated registers accessible through standard function calls + * - Added name field + * - More sanity checking + * + * Chris Beauregard August 9th, 1996 + * - Rewrote /proc/mca + * + * Chris Beauregard January 7th, 1997 + * - Added basic NMI-processing + * - Added more information to mca_info structure + * + * David Weinehall October 12th, 1998 + * - Made a lot of cleaning up in the source + * - Added use of save_flags / restore_flags + * - Added the 'driver_loaded' flag in MCA_adapter + * - Added an alternative implemention of ZP Gu's mca_find_unused_adapter + * + * David Weinehall March 24th, 1999 + * - Fixed the output of 'Driver Installed' in /proc/mca/pos + * - Made the Integrated Video & SCSI show up even if they have id 0000 + * + * Alexander Viro November 9th, 1999 + * - Switched to regular procfs methods + * + * Alfred Arnold & David Weinehall August 23rd, 2000 + * - Added support for Planar POS-registers + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/mca.h> +#include <asm/system.h> +#include <asm/io.h> +#include <linux/proc_fs.h> +#include <linux/mman.h> +#include <linux/config.h> +#include <linux/mm.h> +#include <linux/pagemap.h> +#include <linux/ioport.h> +#include <asm/uaccess.h> +#include <linux/init.h> +#include <asm/arch_hooks.h> + +static unsigned char which_scsi = 0; + +int MCA_bus = 0; +EXPORT_SYMBOL(MCA_bus); + +/* + * Motherboard register spinlock. Untested on SMP at the moment, but + * are there any MCA SMP boxes? + * + * Yes - Alan + */ +static DEFINE_SPINLOCK(mca_lock); + +/* Build the status info for the adapter */ + +static void mca_configure_adapter_status(struct mca_device *mca_dev) { + mca_dev->status = MCA_ADAPTER_NONE; + + mca_dev->pos_id = mca_dev->pos[0] + + (mca_dev->pos[1] << 8); + + if(!mca_dev->pos_id && mca_dev->slot < MCA_MAX_SLOT_NR) { + + /* id = 0x0000 usually indicates hardware failure, + * however, ZP Gu (zpg@castle.net> reports that his 9556 + * has 0x0000 as id and everything still works. There + * also seem to be an adapter with id = 0x0000; the + * NCR Parallel Bus Memory Card. Until this is confirmed, + * however, this code will stay. + */ + + mca_dev->status = MCA_ADAPTER_ERROR; + + return; + } else if(mca_dev->pos_id != 0xffff) { + + /* 0xffff usually indicates that there's no adapter, + * however, some integrated adapters may have 0xffff as + * their id and still be valid. Examples are on-board + * VGA of the 55sx, the integrated SCSI of the 56 & 57, + * and possibly also the 95 ULTIMEDIA. + */ + + mca_dev->status = MCA_ADAPTER_NORMAL; + } + + if((mca_dev->pos_id == 0xffff || + mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) { + int j; + + for(j = 2; j < 8; j++) { + if(mca_dev->pos[j] != 0xff) { + mca_dev->status = MCA_ADAPTER_NORMAL; + break; + } + } + } + + if(!(mca_dev->pos[2] & MCA_ENABLED)) { + + /* enabled bit is in POS 2 */ + + mca_dev->status = MCA_ADAPTER_DISABLED; + } +} /* mca_configure_adapter_status */ + +/*--------------------------------------------------------------------*/ + +static struct resource mca_standard_resources[] = { + { .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" }, + { .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" }, + { .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" }, + { .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" }, + { .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" }, + { .start = 0x96, .end = 0x97, .name = "POS (MCA)" }, + { .start = 0x100, .end = 0x107, .name = "POS (MCA)" } +}; + +#define MCA_STANDARD_RESOURCES (sizeof(mca_standard_resources)/sizeof(struct resource)) + +/** + * mca_read_and_store_pos - read the POS registers into a memory buffer + * @pos: a char pointer to 8 bytes, contains the POS register value on + * successful return + * + * Returns 1 if a card actually exists (i.e. the pos isn't + * all 0xff) or 0 otherwise + */ +static int mca_read_and_store_pos(unsigned char *pos) { + int j; + int found = 0; + + for(j=0; j<8; j++) { + if((pos[j] = inb_p(MCA_POS_REG(j))) != 0xff) { + /* 0xff all across means no device. 0x00 means + * something's broken, but a device is + * probably there. However, if you get 0x00 + * from a motherboard register it won't matter + * what we find. For the record, on the + * 57SLC, the integrated SCSI adapter has + * 0xffff for the adapter ID, but nonzero for + * other registers. */ + + found = 1; + } + } + return found; +} + +static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg) +{ + unsigned char byte; + unsigned long flags; + + if(reg < 0 || reg >= 8) + return 0; + + spin_lock_irqsave(&mca_lock, flags); + if(mca_dev->pos_register) { + /* Disable adapter setup, enable motherboard setup */ + + outb_p(0, MCA_ADAPTER_SETUP_REG); + outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG); + + byte = inb_p(MCA_POS_REG(reg)); + outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG); + } else { + + /* Make sure motherboard setup is off */ + + outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG); + + /* Read the appropriate register */ + + outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG); + byte = inb_p(MCA_POS_REG(reg)); + outb_p(0, MCA_ADAPTER_SETUP_REG); + } + spin_unlock_irqrestore(&mca_lock, flags); + + mca_dev->pos[reg] = byte; + + return byte; +} + +static void mca_pc_write_pos(struct mca_device *mca_dev, int reg, + unsigned char byte) +{ + unsigned long flags; + + if(reg < 0 || reg >= 8) + return; + + spin_lock_irqsave(&mca_lock, flags); + + /* Make sure motherboard setup is off */ + + outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG); + + /* Read in the appropriate register */ + + outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG); + outb_p(byte, MCA_POS_REG(reg)); + outb_p(0, MCA_ADAPTER_SETUP_REG); + + spin_unlock_irqrestore(&mca_lock, flags); + + /* Update the global register list, while we have the byte */ + + mca_dev->pos[reg] = byte; + +} + +/* for the primary MCA bus, we have identity transforms */ +static int mca_dummy_transform_irq(struct mca_device * mca_dev, int irq) +{ + return irq; +} + +static int mca_dummy_transform_ioport(struct mca_device * mca_dev, int port) +{ + return port; +} + +static void *mca_dummy_transform_memory(struct mca_device * mca_dev, void *mem) +{ + return mem; +} + + +static int __init mca_init(void) +{ + unsigned int i, j; + struct mca_device *mca_dev; + unsigned char pos[8]; + short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00}; + struct mca_bus *bus; + + /* WARNING: Be careful when making changes here. Putting an adapter + * and the motherboard simultaneously into setup mode may result in + * damage to chips (according to The Indispensible PC Hardware Book + * by Hans-Peter Messmer). Also, we disable system interrupts (so + * that we are not disturbed in the middle of this). + */ + + /* Make sure the MCA bus is present */ + + if (mca_system_init()) { + printk(KERN_ERR "MCA bus system initialisation failed\n"); + return -ENODEV; + } + + if (!MCA_bus) + return -ENODEV; + + printk(KERN_INFO "Micro Channel bus detected.\n"); + + /* All MCA systems have at least a primary bus */ + bus = mca_attach_bus(MCA_PRIMARY_BUS); + if (!bus) + goto out_nomem; + bus->default_dma_mask = 0xffffffffLL; + bus->f.mca_write_pos = mca_pc_write_pos; + bus->f.mca_read_pos = mca_pc_read_pos; + bus->f.mca_transform_irq = mca_dummy_transform_irq; + bus->f.mca_transform_ioport = mca_dummy_transform_ioport; + bus->f.mca_transform_memory = mca_dummy_transform_memory; + + /* get the motherboard device */ + mca_dev = kmalloc(sizeof(struct mca_device), GFP_KERNEL); + if(unlikely(!mca_dev)) + goto out_nomem; + memset(mca_dev, 0, sizeof(struct mca_device)); + + /* + * We do not expect many MCA interrupts during initialization, + * but let us be safe: + */ + spin_lock_irq(&mca_lock); + + /* Make sure adapter setup is off */ + + outb_p(0, MCA_ADAPTER_SETUP_REG); + + /* Read motherboard POS registers */ + + mca_dev->pos_register = 0x7f; + outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG); + mca_dev->name[0] = 0; + mca_read_and_store_pos(mca_dev->pos); + mca_configure_adapter_status(mca_dev); + /* fake POS and slot for a motherboard */ + mca_dev->pos_id = MCA_MOTHERBOARD_POS; + mca_dev->slot = MCA_MOTHERBOARD; + mca_register_device(MCA_PRIMARY_BUS, mca_dev); + + mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC); + if(unlikely(!mca_dev)) + goto out_unlock_nomem; + memset(mca_dev, 0, sizeof(struct mca_device)); + + + /* Put motherboard into video setup mode, read integrated video + * POS registers, and turn motherboard setup off. + */ + + mca_dev->pos_register = 0xdf; + outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG); + mca_dev->name[0] = 0; + mca_read_and_store_pos(mca_dev->pos); + mca_configure_adapter_status(mca_dev); + /* fake POS and slot for the integrated video */ + mca_dev->pos_id = MCA_INTEGVIDEO_POS; + mca_dev->slot = MCA_INTEGVIDEO; + mca_register_device(MCA_PRIMARY_BUS, mca_dev); + + /* Put motherboard into scsi setup mode, read integrated scsi + * POS registers, and turn motherboard setup off. + * + * It seems there are two possible SCSI registers. Martin says that + * for the 56,57, 0xf7 is the one, but fails on the 76. + * Alfredo (apena@vnet.ibm.com) says + * 0xfd works on his machine. We'll try both of them. I figure it's + * a good bet that only one could be valid at a time. This could + * screw up though if one is used for something else on the other + * machine. + */ + + for(i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) { + outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG); + if(mca_read_and_store_pos(pos)) + break; + } + if(which_scsi) { + /* found a scsi card */ + mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC); + if(unlikely(!mca_dev)) + goto out_unlock_nomem; + memset(mca_dev, 0, sizeof(struct mca_device)); + + for(j = 0; j < 8; j++) + mca_dev->pos[j] = pos[j]; + + mca_configure_adapter_status(mca_dev); + /* fake POS and slot for integrated SCSI controller */ + mca_dev->pos_id = MCA_INTEGSCSI_POS; + mca_dev->slot = MCA_INTEGSCSI; + mca_dev->pos_register = which_scsi; + mca_register_device(MCA_PRIMARY_BUS, mca_dev); + } + + /* Turn off motherboard setup */ + + outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG); + + /* Now loop over MCA slots: put each adapter into setup mode, and + * read its POS registers. Then put adapter setup off. + */ + + for(i=0; i<MCA_MAX_SLOT_NR; i++) { + outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG); + if(!mca_read_and_store_pos(pos)) + continue; + + mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC); + if(unlikely(!mca_dev)) + goto out_unlock_nomem; + memset(mca_dev, 0, sizeof(struct mca_device)); + + for(j=0; j<8; j++) + mca_dev->pos[j]=pos[j]; + + mca_dev->driver_loaded = 0; + mca_dev->slot = i; + mca_dev->pos_register = 0; + mca_configure_adapter_status(mca_dev); + mca_register_device(MCA_PRIMARY_BUS, mca_dev); + } + outb_p(0, MCA_ADAPTER_SETUP_REG); + + /* Enable interrupts and return memory start */ + spin_unlock_irq(&mca_lock); + + for (i = 0; i < MCA_STANDARD_RESOURCES; i++) + request_resource(&ioport_resource, mca_standard_resources + i); + + mca_do_proc_init(); + + return 0; + + out_unlock_nomem: + spin_unlock_irq(&mca_lock); + out_nomem: + printk(KERN_EMERG "Failed memory allocation in MCA setup!\n"); + return -ENOMEM; +} + +subsys_initcall(mca_init); + +/*--------------------------------------------------------------------*/ + +static void mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag) +{ + int slot = mca_dev->slot; + + if(slot == MCA_INTEGSCSI) { + printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n", + mca_dev->name); + } else if(slot == MCA_INTEGVIDEO) { + printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n", + mca_dev->name); + } else if(slot == MCA_MOTHERBOARD) { + printk(KERN_CRIT "NMI: caused by motherboard (%s)\n", + mca_dev->name); + } + + /* More info available in POS 6 and 7? */ + + if(check_flag) { + unsigned char pos6, pos7; + + pos6 = mca_device_read_pos(mca_dev, 6); + pos7 = mca_device_read_pos(mca_dev, 7); + + printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7); + } + +} /* mca_handle_nmi_slot */ + +/*--------------------------------------------------------------------*/ + +static int mca_handle_nmi_callback(struct device *dev, void *data) +{ + struct mca_device *mca_dev = to_mca_device(dev); + unsigned char pos5; + + pos5 = mca_device_read_pos(mca_dev, 5); + + if(!(pos5 & 0x80)) { + /* Bit 7 of POS 5 is reset when this adapter has a hardware + * error. Bit 7 it reset if there's error information + * available in POS 6 and 7. + */ + mca_handle_nmi_device(mca_dev, !(pos5 & 0x40)); + return 1; + } + return 0; +} + +void mca_handle_nmi(void) +{ + /* First try - scan the various adapters and see if a specific + * adapter was responsible for the error. + */ + bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback); + + mca_nmi_hook(); +} /* mca_handle_nmi */ |