ecard.c
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上传日期:2013-02-24
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- /*
- * linux/arch/arm/kernel/ecard.c
- *
- * Copyright 1995-2001 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Find all installed expansion cards, and handle interrupts from them.
- *
- * Created from information from Acorns RiscOS3 PRMs
- *
- * 08-Dec-1996 RMK Added code for the 9'th expansion card - the ether
- * podule slot.
- * 06-May-1997 RMK Added blacklist for cards whose loader doesn't work.
- * 12-Sep-1997 RMK Created new handling of interrupt enables/disables
- * - cards can now register their own routine to control
- * interrupts (recommended).
- * 29-Sep-1997 RMK Expansion card interrupt hardware not being re-enabled
- * on reset from Linux. (Caused cards not to respond
- * under RiscOS without hard reset).
- * 15-Feb-1998 RMK Added DMA support
- * 12-Sep-1998 RMK Added EASI support
- * 10-Jan-1999 RMK Run loaders in a simulated RISC OS environment.
- * 17-Apr-1999 RMK Support for EASI Type C cycles.
- */
- #define ECARD_C
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/sched.h>
- #include <linux/interrupt.h>
- #include <linux/reboot.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/proc_fs.h>
- #include <linux/notifier.h>
- #include <linux/init.h>
- #include <asm/dma.h>
- #include <asm/ecard.h>
- #include <asm/hardware.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/pgalloc.h>
- #include <asm/mmu_context.h>
- #include <asm/mach/irq.h>
- #ifndef CONFIG_ARCH_RPC
- #define HAVE_EXPMASK
- #endif
- enum req {
- req_readbytes,
- req_reset_all
- };
- struct ecard_request {
- enum req req;
- ecard_t *ec;
- unsigned int address;
- unsigned int length;
- unsigned int use_loader;
- void *buffer;
- };
- struct expcard_blacklist {
- unsigned short manufacturer;
- unsigned short product;
- const char *type;
- };
- static ecard_t *cards;
- static ecard_t *slot_to_expcard[MAX_ECARDS];
- static unsigned int ectcr;
- #ifdef HAS_EXPMASK
- static unsigned int have_expmask;
- #endif
- /* List of descriptions of cards which don't have an extended
- * identification, or chunk directories containing a description.
- */
- static struct expcard_blacklist __initdata blacklist[] = {
- { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
- };
- asmlinkage extern int
- ecard_loader_reset(volatile unsigned char *pa, loader_t loader);
- asmlinkage extern int
- ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);
- extern int setup_arm_irq(int, struct irqaction *);
- extern void do_ecard_IRQ(int, struct pt_regs *);
- static void
- ecard_irq_noexpmask(int intr_no, void *dev_id, struct pt_regs *regs);
- static struct irqaction irqexpansioncard = {
- ecard_irq_noexpmask, SA_INTERRUPT, 0, "expansion cards", NULL, NULL
- };
- static inline unsigned short
- ecard_getu16(unsigned char *v)
- {
- return v[0] | v[1] << 8;
- }
- static inline signed long
- ecard_gets24(unsigned char *v)
- {
- return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
- }
- static inline ecard_t *
- slot_to_ecard(unsigned int slot)
- {
- return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
- }
- /* ===================== Expansion card daemon ======================== */
- /*
- * Since the loader programs on the expansion cards need to be run
- * in a specific environment, create a separate task with this
- * environment up, and pass requests to this task as and when we
- * need to.
- *
- * This should allow 99% of loaders to be called from Linux.
- *
- * From a security standpoint, we trust the card vendors. This
- * may be a misplaced trust.
- */
- #define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
- #define POD_INT_ADDR(x) ((volatile unsigned char *)
- ((BUS_ADDR((x)) - IO_BASE) + IO_START))
- static inline void ecard_task_reset(void)
- {
- ecard_t *ec;
- for (ec = cards; ec; ec = ec->next)
- if (ec->loader)
- ecard_loader_reset(POD_INT_ADDR(ec->podaddr),
- ec->loader);
- }
- static void
- ecard_task_readbytes(struct ecard_request *req)
- {
- unsigned char *buf = (unsigned char *)req->buffer;
- volatile unsigned char *base_addr =
- (volatile unsigned char *)POD_INT_ADDR(req->ec->podaddr);
- unsigned int len = req->length;
- unsigned int off = req->address;
- if (req->ec->slot_no == 8) {
- /*
- * The card maintains an index which increments the address
- * into a 4096-byte page on each access. We need to keep
- * track of the counter.
- */
- static unsigned int index;
- unsigned int page;
- page = (off >> 12) * 4;
- if (page > 256 * 4)
- return;
- off &= 4095;
- /*
- * If we are reading offset 0, or our current index is
- * greater than the offset, reset the hardware index counter.
- */
- if (off == 0 || index > off) {
- *base_addr = 0;
- index = 0;
- }
- /*
- * Increment the hardware index counter until we get to the
- * required offset. The read bytes are discarded.
- */
- while (index < off) {
- unsigned char byte;
- byte = base_addr[page];
- index += 1;
- }
- while (len--) {
- *buf++ = base_addr[page];
- index += 1;
- }
- } else {
- if (!req->use_loader || !req->ec->loader) {
- off *= 4;
- while (len--) {
- *buf++ = base_addr[off];
- off += 4;
- }
- } else {
- while(len--) {
- /*
- * The following is required by some
- * expansion card loader programs.
- */
- *(unsigned long *)0x108 = 0;
- *buf++ = ecard_loader_read(off++, base_addr,
- req->ec->loader);
- }
- }
- }
- }
- static void ecard_do_request(struct ecard_request *req)
- {
- switch (req->req) {
- case req_readbytes:
- ecard_task_readbytes(req);
- break;
- case req_reset_all:
- ecard_task_reset();
- break;
- }
- }
- #ifdef CONFIG_CPU_32
- #include <linux/completion.h>
- static pid_t ecard_pid;
- static wait_queue_head_t ecard_wait;
- static struct ecard_request *ecard_req;
- static DECLARE_COMPLETION(ecard_completion);
- /*
- * Set up the expansion card daemon's page tables.
- */
- static void ecard_init_pgtables(struct mm_struct *mm)
- {
- /* We want to set up the page tables for the following mapping:
- * Virtual Physical
- * 0x03000000 0x03000000
- * 0x03010000 unmapped
- * 0x03210000 0x03210000
- * 0x03400000 unmapped
- * 0x08000000 0x08000000
- * 0x10000000 unmapped
- *
- * FIXME: we don't follow this 100% yet.
- */
- pgd_t *src_pgd, *dst_pgd;
- unsigned int dst_addr = IO_START;
- src_pgd = pgd_offset(mm, IO_BASE);
- dst_pgd = pgd_offset(mm, dst_addr);
- while (dst_addr < IO_START + IO_SIZE) {
- *dst_pgd++ = *src_pgd++;
- dst_addr += PGDIR_SIZE;
- }
- dst_addr = EASI_START;
- src_pgd = pgd_offset(mm, EASI_BASE);
- dst_pgd = pgd_offset(mm, dst_addr);
- while (dst_addr < EASI_START + EASI_SIZE) {
- *dst_pgd++ = *src_pgd++;
- dst_addr += PGDIR_SIZE;
- }
- flush_tlb_range(mm, IO_START, IO_START + IO_SIZE);
- flush_tlb_range(mm, EASI_START, EASI_START + EASI_SIZE);
- }
- static int ecard_init_mm(void)
- {
- struct mm_struct * mm = mm_alloc();
- struct mm_struct *active_mm = current->active_mm;
- if (!mm)
- return -ENOMEM;
- current->mm = mm;
- current->active_mm = mm;
- activate_mm(active_mm, mm);
- mmdrop(active_mm);
- ecard_init_pgtables(mm);
- return 0;
- }
- static int
- ecard_task(void * unused)
- {
- struct task_struct *tsk = current;
- /*
- * We don't want /any/ signals, not even SIGKILL
- */
- sigfillset(&tsk->blocked);
- sigemptyset(&tsk->pending.signal);
- recalc_sigpending(tsk);
- strcpy(tsk->comm, "kecardd");
- daemonize();
- /*
- * Allocate a mm. We're not a lazy-TLB kernel task since we need
- * to set page table entries where the user space would be. Note
- * that this also creates the page tables. Failure is not an
- * option here.
- */
- if (ecard_init_mm())
- panic("kecardd: unable to alloc mmn");
- while (1) {
- struct ecard_request *req;
- do {
- req = xchg(&ecard_req, NULL);
- if (req == NULL) {
- sigemptyset(&tsk->pending.signal);
- interruptible_sleep_on(&ecard_wait);
- }
- } while (req == NULL);
- ecard_do_request(req);
- complete(&ecard_completion);
- }
- }
- /*
- * Wake the expansion card daemon to action our request.
- *
- * FIXME: The test here is not sufficient to detect if the
- * kcardd is running.
- */
- static void
- ecard_call(struct ecard_request *req)
- {
- /*
- * Make sure we have a context that is able to sleep.
- */
- if (current == &init_task || in_interrupt())
- BUG();
- if (ecard_pid <= 0)
- ecard_pid = kernel_thread(ecard_task, NULL,
- CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
- ecard_req = req;
- wake_up(&ecard_wait);
- /*
- * Now wait for kecardd to run.
- */
- wait_for_completion(&ecard_completion);
- }
- #else
- /*
- * On 26-bit processors, we don't need the kcardd thread to access the
- * expansion card loaders. We do it directly.
- */
- #define ecard_call(req) ecard_do_request(req)
- #endif
- /* ======================= Mid-level card control ===================== */
- /*
- * This function is responsible for resetting the expansion cards to a
- * sensible state immediately prior to rebooting the system. This function
- * has process state (keventd), so we can sleep.
- *
- * Possible "val" values here:
- * SYS_RESTART - restarting system
- * SYS_HALT - halting system
- * SYS_POWER_OFF - powering down system
- *
- * We ignore all calls, unless it is a SYS_RESTART call - power down/halts
- * will be followed by a SYS_RESTART if ctrl-alt-del is pressed again.
- */
- static int ecard_reboot(struct notifier_block *me, unsigned long val, void *v)
- {
- struct ecard_request req;
- if (val != SYS_RESTART)
- return 0;
- /*
- * Disable the expansion card interrupt
- */
- disable_irq(IRQ_EXPANSIONCARD);
- /*
- * If we have any expansion card loader code which will handle
- * the reset for us, call it now.
- */
- req.req = req_reset_all;
- ecard_call(&req);
- /*
- * Disable the expansion card interrupt again, just to be sure.
- */
- disable_irq(IRQ_EXPANSIONCARD);
- /*
- * Finally, reset the expansion card interrupt mask to
- * all enable (RISC OS doesn't set this)
- */
- #ifdef HAS_EXPMASK
- have_expmask = ~0;
- __raw_writeb(have_expmask, EXPMASK_ENABLE);
- #endif
- return 0;
- }
- static struct notifier_block ecard_reboot_notifier = {
- notifier_call: ecard_reboot,
- };
- static void
- ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
- {
- struct ecard_request req;
- req.req = req_readbytes;
- req.ec = ec;
- req.address = off;
- req.length = len;
- req.use_loader = useld;
- req.buffer = addr;
- ecard_call(&req);
- }
- int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
- {
- struct ex_chunk_dir excd;
- int index = 16;
- int useld = 0;
- if (!ec->cid.cd)
- return 0;
- while(1) {
- ecard_readbytes(&excd, ec, index, 8, useld);
- index += 8;
- if (c_id(&excd) == 0) {
- if (!useld && ec->loader) {
- useld = 1;
- index = 0;
- continue;
- }
- return 0;
- }
- if (c_id(&excd) == 0xf0) { /* link */
- index = c_start(&excd);
- continue;
- }
- if (c_id(&excd) == 0x80) { /* loader */
- if (!ec->loader) {
- ec->loader = (loader_t)kmalloc(c_len(&excd),
- GFP_KERNEL);
- if (ec->loader)
- ecard_readbytes(ec->loader, ec,
- (int)c_start(&excd),
- c_len(&excd), useld);
- else
- return 0;
- }
- continue;
- }
- if (c_id(&excd) == id && num-- == 0)
- break;
- }
- if (c_id(&excd) & 0x80) {
- switch (c_id(&excd) & 0x70) {
- case 0x70:
- ecard_readbytes((unsigned char *)excd.d.string, ec,
- (int)c_start(&excd), c_len(&excd),
- useld);
- break;
- case 0x00:
- break;
- }
- }
- cd->start_offset = c_start(&excd);
- memcpy(cd->d.string, excd.d.string, 256);
- return 1;
- }
- /* ======================= Interrupt control ============================ */
- static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
- {
- #ifdef HAS_EXPMASK
- if (irqnr < 4 && have_expmask) {
- have_expmask |= 1 << irqnr;
- __raw_writeb(have_expmask, EXPMASK_ENABLE);
- }
- #endif
- }
- static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
- {
- #ifdef HAS_EXPMASK
- if (irqnr < 4 && have_expmask) {
- have_expmask &= ~(1 << irqnr);
- __raw_writeb(have_expmask, EXPMASK_ENABLE);
- }
- #endif
- }
- static int ecard_def_irq_pending(ecard_t *ec)
- {
- return !ec->irqmask || ec->irqaddr[0] & ec->irqmask;
- }
- static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
- {
- panic("ecard_def_fiq_enable called - impossible");
- }
- static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
- {
- panic("ecard_def_fiq_disable called - impossible");
- }
- static int ecard_def_fiq_pending(ecard_t *ec)
- {
- return !ec->fiqmask || ec->fiqaddr[0] & ec->fiqmask;
- }
- static expansioncard_ops_t ecard_default_ops = {
- ecard_def_irq_enable,
- ecard_def_irq_disable,
- ecard_def_irq_pending,
- ecard_def_fiq_enable,
- ecard_def_fiq_disable,
- ecard_def_fiq_pending
- };
- /*
- * Enable and disable interrupts from expansion cards.
- * (interrupts are disabled for these functions).
- *
- * They are not meant to be called directly, but via enable/disable_irq.
- */
- static void ecard_enableirq(unsigned int irqnr)
- {
- ecard_t *ec = slot_to_ecard(irqnr - 32);
- if (ec) {
- if (!ec->ops)
- ec->ops = &ecard_default_ops;
- if (ec->claimed && ec->ops->irqenable)
- ec->ops->irqenable(ec, irqnr);
- else
- printk(KERN_ERR "ecard: rejecting request to "
- "enable IRQs for %dn", irqnr);
- }
- }
- static void ecard_disableirq(unsigned int irqnr)
- {
- ecard_t *ec = slot_to_ecard(irqnr - 32);
- if (ec) {
- if (!ec->ops)
- ec->ops = &ecard_default_ops;
- if (ec->ops && ec->ops->irqdisable)
- ec->ops->irqdisable(ec, irqnr);
- }
- }
- void ecard_enablefiq(unsigned int fiqnr)
- {
- ecard_t *ec = slot_to_ecard(fiqnr);
- if (ec) {
- if (!ec->ops)
- ec->ops = &ecard_default_ops;
- if (ec->claimed && ec->ops->fiqenable)
- ec->ops->fiqenable(ec, fiqnr);
- else
- printk(KERN_ERR "ecard: rejecting request to "
- "enable FIQs for %dn", fiqnr);
- }
- }
- void ecard_disablefiq(unsigned int fiqnr)
- {
- ecard_t *ec = slot_to_ecard(fiqnr);
- if (ec) {
- if (!ec->ops)
- ec->ops = &ecard_default_ops;
- if (ec->ops->fiqdisable)
- ec->ops->fiqdisable(ec, fiqnr);
- }
- }
- static void
- ecard_dump_irq_state(ecard_t *ec)
- {
- printk(" %d: %sclaimed, ",
- ec->slot_no,
- ec->claimed ? "" : "not ");
- if (ec->ops && ec->ops->irqpending &&
- ec->ops != &ecard_default_ops)
- printk("irq %spendingn",
- ec->ops->irqpending(ec) ? "" : "not ");
- else
- printk("irqaddr %p, mask = %02X, status = %02Xn",
- ec->irqaddr, ec->irqmask, *ec->irqaddr);
- }
- static void
- ecard_check_lockup(void)
- {
- static int last, lockup;
- ecard_t *ec;
- /*
- * If the timer interrupt has not run since the last million
- * unrecognised expansion card interrupts, then there is
- * something seriously wrong. Disable the expansion card
- * interrupts so at least we can continue.
- *
- * Maybe we ought to start a timer to re-enable them some time
- * later?
- */
- if (last == jiffies) {
- lockup += 1;
- if (lockup > 1000000) {
- printk(KERN_ERR "nInterrupt lockup detected - "
- "disabling all expansion card interruptsn");
- disable_irq(IRQ_EXPANSIONCARD);
- printk("Expansion card IRQ state:n");
- for (ec = cards; ec; ec = ec->next)
- ecard_dump_irq_state(ec);
- }
- } else
- lockup = 0;
- /*
- * If we did not recognise the source of this interrupt,
- * warn the user, but don't flood the user with these messages.
- */
- if (!last || time_after(jiffies, last + 5*HZ)) {
- last = jiffies;
- printk(KERN_WARNING "Unrecognised interrupt from backplanen");
- }
- }
- static void
- ecard_irq_noexpmask(int intr_no, void *dev_id, struct pt_regs *regs)
- {
- ecard_t *ec;
- int called = 0;
- for (ec = cards; ec; ec = ec->next) {
- int pending;
- if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
- continue;
- if (ec->ops && ec->ops->irqpending)
- pending = ec->ops->irqpending(ec);
- else
- pending = ecard_default_ops.irqpending(ec);
- if (pending) {
- do_ecard_IRQ(ec->irq, regs);
- called ++;
- }
- }
- cli();
- if (called == 0)
- ecard_check_lockup();
- }
- #ifdef HAS_EXPMASK
- static unsigned char priority_masks[] =
- {
- 0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
- };
- static unsigned char first_set[] =
- {
- 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
- 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
- };
- static void
- ecard_irq_expmask(int intr_no, void *dev_id, struct pt_regs *regs)
- {
- const unsigned int statusmask = 15;
- unsigned int status;
- status = __raw_readb(EXPMASK_STATUS) & statusmask;
- if (status) {
- unsigned int slot;
- ecard_t *ec;
- again:
- slot = first_set[status];
- ec = slot_to_ecard(slot);
- if (ec->claimed) {
- unsigned int oldexpmask;
- /*
- * this ugly code is so that we can operate a
- * prioritorising system:
- *
- * Card 0 highest priority
- * Card 1
- * Card 2
- * Card 3 lowest priority
- *
- * Serial cards should go in 0/1, ethernet/scsi in 2/3
- * otherwise you will lose serial data at high speeds!
- */
- oldexpmask = have_expmask;
- have_expmask &= priority_masks[slot];
- __raw_writeb(have_expmask, EXPMASK_ENABLE);
- sti();
- do_ecard_IRQ(ec->irq, regs);
- cli();
- have_expmask = oldexpmask;
- __raw_writeb(have_expmask, EXPMASK_ENABLE);
- status = __raw_readb(EXPMASK_STATUS) & statusmask;
- if (status)
- goto again;
- } else {
- printk(KERN_WARNING "card%d: interrupt from unclaimed "
- "card???n", slot);
- have_expmask &= ~(1 << slot);
- __raw_writeb(have_expmask, EXPMASK_ENABLE);
- }
- } else
- printk(KERN_WARNING "Wild interrupt from backplane (masks)n");
- }
- static void __init
- ecard_probeirqhw(void)
- {
- ecard_t *ec;
- int found;
- __raw_writeb(0x00, EXPMASK_ENABLE);
- __raw_writeb(0xff, EXPMASK_STATUS);
- found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
- __raw_writeb(0xff, EXPMASK_ENABLE);
- if (!found)
- return;
- printk(KERN_DEBUG "Expansion card interrupt "
- "management hardware foundn");
- irqexpansioncard.handler = ecard_irq_expmask;
- /* for each card present, set a bit to '1' */
- have_expmask = 0x80000000;
- for (ec = cards; ec; ec = ec->next)
- have_expmask |= 1 << ec->slot_no;
- __raw_writeb(have_expmask, EXPMASK_ENABLE);
- }
- #else
- #define ecard_probeirqhw()
- #endif
- #ifndef IO_EC_MEMC8_BASE
- #define IO_EC_MEMC8_BASE 0
- #endif
- unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
- {
- unsigned long address = 0;
- int slot = ec->slot_no;
- if (ec->slot_no == 8)
- return IO_EC_MEMC8_BASE;
- ectcr &= ~(1 << slot);
- switch (type) {
- case ECARD_MEMC:
- if (slot < 4)
- address = IO_EC_MEMC_BASE + (slot << 12);
- break;
- case ECARD_IOC:
- if (slot < 4)
- address = IO_EC_IOC_BASE + (slot << 12);
- #ifdef IO_EC_IOC4_BASE
- else
- address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
- #endif
- if (address)
- address += speed << 17;
- break;
- #ifdef IO_EC_EASI_BASE
- case ECARD_EASI:
- address = IO_EC_EASI_BASE + (slot << 22);
- if (speed == ECARD_FAST)
- ectcr |= 1 << slot;
- break;
- #endif
- default:
- break;
- }
- #ifdef IOMD_ECTCR
- iomd_writeb(ectcr, IOMD_ECTCR);
- #endif
- return address;
- }
- static int ecard_prints(char *buffer, ecard_t *ec)
- {
- char *start = buffer;
- buffer += sprintf(buffer, " %d: %s ", ec->slot_no,
- ec->type == ECARD_EASI ? "EASI" : " ");
- if (ec->cid.id == 0) {
- struct in_chunk_dir incd;
- buffer += sprintf(buffer, "[%04X:%04X] ",
- ec->cid.manufacturer, ec->cid.product);
- if (!ec->card_desc && ec->cid.cd &&
- ecard_readchunk(&incd, ec, 0xf5, 0)) {
- ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
- if (ec->card_desc)
- strcpy((char *)ec->card_desc, incd.d.string);
- }
- buffer += sprintf(buffer, "%sn", ec->card_desc ? ec->card_desc : "*unknown*");
- } else
- buffer += sprintf(buffer, "Simple card %dn", ec->cid.id);
- return buffer - start;
- }
- static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
- {
- ecard_t *ec = cards;
- off_t at = 0;
- int len, cnt;
- cnt = 0;
- while (ec && count > cnt) {
- len = ecard_prints(buf, ec);
- at += len;
- if (at >= pos) {
- if (!*start) {
- *start = buf + (pos - (at - len));
- cnt = at - pos;
- } else
- cnt += len;
- buf += len;
- }
- ec = ec->next;
- }
- return (count > cnt) ? cnt : count;
- }
- static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
- static void ecard_proc_init(void)
- {
- proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
- create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
- get_ecard_dev_info);
- }
- /*
- * Probe for an expansion card.
- *
- * If bit 1 of the first byte of the card is set, then the
- * card does not exist.
- */
- static int __init
- ecard_probe(int slot, card_type_t type)
- {
- ecard_t **ecp;
- ecard_t *ec;
- struct ex_ecid cid;
- int i, rc = -ENOMEM;
- ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
- if (!ec)
- goto nomem;
- memset(ec, 0, sizeof(ecard_t));
- ec->slot_no = slot;
- ec->type = type;
- ec->irq = NO_IRQ;
- ec->fiq = NO_IRQ;
- ec->dma = NO_DMA;
- ec->card_desc = NULL;
- ec->ops = &ecard_default_ops;
- rc = -ENODEV;
- if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
- goto nodev;
- cid.r_zero = 1;
- ecard_readbytes(&cid, ec, 0, 16, 0);
- if (cid.r_zero)
- goto nodev;
- ec->cid.id = cid.r_id;
- ec->cid.cd = cid.r_cd;
- ec->cid.is = cid.r_is;
- ec->cid.w = cid.r_w;
- ec->cid.manufacturer = ecard_getu16(cid.r_manu);
- ec->cid.product = ecard_getu16(cid.r_prod);
- ec->cid.country = cid.r_country;
- ec->cid.irqmask = cid.r_irqmask;
- ec->cid.irqoff = ecard_gets24(cid.r_irqoff);
- ec->cid.fiqmask = cid.r_fiqmask;
- ec->cid.fiqoff = ecard_gets24(cid.r_fiqoff);
- ec->fiqaddr =
- ec->irqaddr = (unsigned char *)ioaddr(ec->podaddr);
- if (ec->cid.is) {
- ec->irqmask = ec->cid.irqmask;
- ec->irqaddr += ec->cid.irqoff;
- ec->fiqmask = ec->cid.fiqmask;
- ec->fiqaddr += ec->cid.fiqoff;
- } else {
- ec->irqmask = 1;
- ec->fiqmask = 4;
- }
- for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
- if (blacklist[i].manufacturer == ec->cid.manufacturer &&
- blacklist[i].product == ec->cid.product) {
- ec->card_desc = blacklist[i].type;
- break;
- }
- ec->irq = 32 + slot;
- #ifdef IO_EC_MEMC8_BASE
- if (slot == 8)
- ec->irq = 11;
- #endif
- /*
- * hook the interrupt handlers
- */
- if (ec->irq != 0 && ec->irq >= 32) {
- irq_desc[ec->irq].mask_ack = ecard_disableirq;
- irq_desc[ec->irq].mask = ecard_disableirq;
- irq_desc[ec->irq].unmask = ecard_enableirq;
- irq_desc[ec->irq].valid = 1;
- }
- #ifdef CONFIG_ARCH_RPC
- /* On RiscPC, only first two slots have DMA capability */
- if (slot < 2)
- ec->dma = 2 + slot;
- #endif
- for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
- *ecp = ec;
- slot_to_expcard[slot] = ec;
- return 0;
- nodev:
- kfree(ec);
- nomem:
- return rc;
- }
- static ecard_t *finding_pos;
- void ecard_startfind(void)
- {
- finding_pos = NULL;
- }
- ecard_t *ecard_find(int cid, const card_ids *cids)
- {
- if (!finding_pos)
- finding_pos = cards;
- else
- finding_pos = finding_pos->next;
- for (; finding_pos; finding_pos = finding_pos->next) {
- if (finding_pos->claimed)
- continue;
- if (!cids) {
- if ((finding_pos->cid.id ^ cid) == 0)
- break;
- } else {
- unsigned int manufacturer, product;
- int i;
- manufacturer = finding_pos->cid.manufacturer;
- product = finding_pos->cid.product;
- for (i = 0; cids[i].manufacturer != 65535; i++)
- if (manufacturer == cids[i].manufacturer &&
- product == cids[i].product)
- break;
- if (cids[i].manufacturer != 65535)
- break;
- }
- }
- return finding_pos;
- }
- static void __init ecard_free_all(void)
- {
- ecard_t *ec, *ecn;
- for (ec = cards; ec; ec = ecn) {
- ecn = ec->next;
- kfree(ec);
- }
- cards = NULL;
- memset(slot_to_expcard, 0, sizeof(slot_to_expcard));
- }
- /*
- * Initialise the expansion card system.
- * Locate all hardware - interrupt management and
- * actual cards.
- */
- void __init ecard_init(void)
- {
- int slot;
- /*
- * Register our reboot notifier
- */
- register_reboot_notifier(&ecard_reboot_notifier);
- #ifdef CONFIG_CPU_32
- init_waitqueue_head(&ecard_wait);
- #endif
- printk("Probing expansion cardsn");
- for (slot = 0; slot < 8; slot ++) {
- if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
- ecard_probe(slot, ECARD_IOC);
- }
- #ifdef IO_EC_MEMC8_BASE
- ecard_probe(8, ECARD_IOC);
- #endif
- ecard_probeirqhw();
- if (setup_arm_irq(IRQ_EXPANSIONCARD, &irqexpansioncard)) {
- printk(KERN_ERR "Unable to claim IRQ%d for expansion cardsn",
- IRQ_EXPANSIONCARD);
- ecard_free_all();
- }
- ecard_proc_init();
- }
- EXPORT_SYMBOL(ecard_startfind);
- EXPORT_SYMBOL(ecard_find);
- EXPORT_SYMBOL(ecard_readchunk);
- EXPORT_SYMBOL(ecard_address);