diff options
Diffstat (limited to 'arch/arm26/kernel/ecard.c')
| -rw-r--r-- | arch/arm26/kernel/ecard.c | 847 |
1 files changed, 0 insertions, 847 deletions
diff --git a/arch/arm26/kernel/ecard.c b/arch/arm26/kernel/ecard.c deleted file mode 100644 index e2bcefc91cc..00000000000 --- a/arch/arm26/kernel/ecard.c +++ /dev/null @@ -1,847 +0,0 @@ -/* - * linux/arch/arm26/kernel/ecard.c - * - * Copyright 1995-2001 Russell King - * Copyright 2003 Ian Molton - * - * 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 - * 15-Jun-2003 IM Modified from ARM32 (RiscPC capable) version - * 10-Jan-1999 RMK Run loaders in a simulated RISC OS environment. - * 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). - * - */ -#define ECARD_C - -#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/device.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/mmu_context.h> -#include <asm/irqchip.h> -#include <asm/tlbflush.h> - -enum req { - req_readbytes, - req_reset -}; - -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; - -/* 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); - -static const struct ecard_id * -ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec); - -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(struct ecard_request *req) -{ - struct expansion_card *ec = req->ec; - 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->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: - ecard_task_reset(req); - break; - } -} - -/* - * 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) - -/* ======================= Mid-level card control ===================== */ - -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 = 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) -{ -} - -static void ecard_def_irq_disable(ecard_t *ec, int irqnr) -{ -} - -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_irq_unmask(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 %d\n", irqnr); - } -} - -static void ecard_irq_mask(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); - } -} - -static struct irqchip ecard_chip = { - .ack = ecard_irq_mask, - .mask = ecard_irq_mask, - .unmask = ecard_irq_unmask, -}; - -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 %d\n", 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 %spending\n", - ec->ops->irqpending(ec) ? "" : "not "); - else - printk("irqaddr %p, mask = %02X, status = %02X\n", - ec->irqaddr, ec->irqmask, *ec->irqaddr); -} - -static void ecard_check_lockup(struct irqdesc *desc) -{ - 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 interrupts\n"); - - desc->chip->mask(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, (unsigned long)(last + 5*HZ))) { - last = jiffies; - printk(KERN_WARNING "Unrecognised interrupt from backplane\n"); - } -} - -static void -ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) -{ - ecard_t *ec; - int called = 0; - - desc->chip->mask(irq); - for (ec = cards; ec; ec = ec->next) { - int pending; - - if (!ec->claimed || ec->irq == NO_IRQ) - continue; - - if (ec->ops && ec->ops->irqpending) - pending = ec->ops->irqpending(ec); - else - pending = ecard_default_ops.irqpending(ec); - - if (pending) { - struct irqdesc *d = irq_desc + ec->irq; - d->handle(ec->irq, d, regs); - called ++; - } - } - desc->chip->unmask(irq); - - if (called == 0) - ecard_check_lockup(desc); -} - -#define ecard_irqexp_handler NULL -#define ecard_probeirqhw() (0) - -unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed) -{ - unsigned long address = 0; - int slot = ec->slot_no; - - ectcr &= ~(1 << slot); - - switch (type) { - case ECARD_MEMC: - address = IO_EC_MEMC_BASE + (slot << 12); - break; - - case ECARD_IOC: - address = IO_EC_IOC_BASE + (slot << 12) + (speed << 17); - break; - - default: - break; - } - - return address; -} - -static int ecard_prints(char *buffer, ecard_t *ec) -{ - char *start = buffer; - - buffer += sprintf(buffer, " %d: ", ec->slot_no); - - 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, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*"); - } else - buffer += sprintf(buffer, "Simple card %d\n", 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); -} - -#define ec_set_resource(ec,nr,st,sz,flg) \ - do { \ - (ec)->resource[nr].name = ec->dev.bus_id; \ - (ec)->resource[nr].start = st; \ - (ec)->resource[nr].end = (st) + (sz) - 1; \ - (ec)->resource[nr].flags = flg; \ - } while (0) - -static void __init ecard_init_resources(struct expansion_card *ec) -{ - unsigned long base = PODSLOT_IOC0_BASE; - unsigned int slot = ec->slot_no; - int i; - - ec_set_resource(ec, ECARD_RES_MEMC, - PODSLOT_MEMC_BASE + (slot << 14), - PODSLOT_MEMC_SIZE, IORESOURCE_MEM); - - for (i = 0; i < ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) { - ec_set_resource(ec, i + ECARD_RES_IOCSLOW, - base + (slot << 14) + (i << 19), - PODSLOT_IOC_SIZE, IORESOURCE_MEM); - } - - for (i = 0; i < ECARD_NUM_RESOURCES; i++) { - if (ec->resource[i].start && - request_resource(&iomem_resource, &ec->resource[i])) { - printk(KERN_ERR "%s: resource(s) not available\n", - ec->dev.bus_id); - ec->resource[i].end -= ec->resource[i].start; - ec->resource[i].start = 0; - } - } -} - -static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct expansion_card *ec = ECARD_DEV(dev); - return sprintf(buf, "%u\n", ec->irq); -} - -static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct expansion_card *ec = ECARD_DEV(dev); - return sprintf(buf, "%u\n", ec->cid.manufacturer); -} - -static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct expansion_card *ec = ECARD_DEV(dev); - return sprintf(buf, "%u\n", ec->cid.product); -} - -static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct expansion_card *ec = ECARD_DEV(dev); - return sprintf(buf, "%u\n", ec->dma); -} - -static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct expansion_card *ec = ECARD_DEV(dev); - char *str = buf; - int i; - - for (i = 0; i < ECARD_NUM_RESOURCES; i++) - str += sprintf(str, "%08lx %08lx %08lx\n", - ec->resource[i].start, - ec->resource[i].end, - ec->resource[i].flags); - - return str - buf; -} - -static DEVICE_ATTR(irq, S_IRUGO, ecard_show_irq, NULL); -static DEVICE_ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL); -static DEVICE_ATTR(device, S_IRUGO, ecard_show_device, NULL); -static DEVICE_ATTR(dma, S_IRUGO, ecard_show_dma, NULL); -static DEVICE_ATTR(resource, S_IRUGO, ecard_show_resources, NULL); - -/* - * 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 = kzalloc(sizeof(ecard_t), GFP_KERNEL); - if (!ec) - goto nomem; - - 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 < ARRAY_SIZE(blacklist); i++) - if (blacklist[i].manufacturer == ec->cid.manufacturer && - blacklist[i].product == ec->cid.product) { - ec->card_desc = blacklist[i].type; - break; - } - - snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot); - ec->dev.parent = NULL; - ec->dev.bus = &ecard_bus_type; - ec->dev.dma_mask = &ec->dma_mask; - ec->dma_mask = (u64)0xffffffff; - - ecard_init_resources(ec); - - /* - * hook the interrupt handlers - */ - ec->irq = 32 + slot; - set_irq_chip(ec->irq, &ecard_chip); - set_irq_handler(ec->irq, do_level_IRQ); - set_irq_flags(ec->irq, IRQF_VALID); - - for (ecp = &cards; *ecp; ecp = &(*ecp)->next); - - *ecp = ec; - slot_to_expcard[slot] = ec; - - device_register(&ec->dev); - device_create_file(&ec->dev, &dev_attr_dma); - device_create_file(&ec->dev, &dev_attr_irq); - device_create_file(&ec->dev, &dev_attr_resource); - device_create_file(&ec->dev, &dev_attr_vendor); - device_create_file(&ec->dev, &dev_attr_device); - - return 0; - -nodev: - kfree(ec); -nomem: - return rc; -} - -/* - * Initialise the expansion card system. - * Locate all hardware - interrupt management and - * actual cards. - */ -static int __init ecard_init(void) -{ - int slot, irqhw; - - printk("Probing expansion cards\n"); - - for (slot = 0; slot < MAX_ECARDS; slot ++) { - ecard_probe(slot, ECARD_IOC); - } - - irqhw = ecard_probeirqhw(); - - set_irq_chained_handler(IRQ_EXPANSIONCARD, - irqhw ? ecard_irqexp_handler : ecard_irq_handler); - - ecard_proc_init(); - - return 0; -} - -subsys_initcall(ecard_init); - -/* - * ECARD "bus" - */ -static const struct ecard_id * -ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec) -{ - int i; - - for (i = 0; ids[i].manufacturer != 65535; i++) - if (ec->cid.manufacturer == ids[i].manufacturer && - ec->cid.product == ids[i].product) - return ids + i; - - return NULL; -} - -static int ecard_drv_probe(struct device *dev) -{ - struct expansion_card *ec = ECARD_DEV(dev); - struct ecard_driver *drv = ECARD_DRV(dev->driver); - const struct ecard_id *id; - int ret; - - id = ecard_match_device(drv->id_table, ec); - - ecard_claim(ec); - ret = drv->probe(ec, id); - if (ret) - ecard_release(ec); - return ret; -} - -static int ecard_drv_remove(struct device *dev) -{ - struct expansion_card *ec = ECARD_DEV(dev); - struct ecard_driver *drv = ECARD_DRV(dev->driver); - - drv->remove(ec); - ecard_release(ec); - - return 0; -} - -/* - * Before rebooting, we must make sure that the expansion card is in a - * sensible state, so it can be re-detected. This means that the first - * page of the ROM must be visible. We call the expansion cards reset - * handler, if any. - */ -static void ecard_drv_shutdown(struct device *dev) -{ - struct expansion_card *ec = ECARD_DEV(dev); - struct ecard_driver *drv = ECARD_DRV(dev->driver); - struct ecard_request req; - - if (drv->shutdown) - drv->shutdown(ec); - ecard_release(ec); - req.req = req_reset; - req.ec = ec; - ecard_call(&req); -} - -int ecard_register_driver(struct ecard_driver *drv) -{ - drv->drv.bus = &ecard_bus_type; - drv->drv.probe = ecard_drv_probe; - drv->drv.remove = ecard_drv_remove; - drv->drv.shutdown = ecard_drv_shutdown; - - return driver_register(&drv->drv); -} - -void ecard_remove_driver(struct ecard_driver *drv) -{ - driver_unregister(&drv->drv); -} - -static int ecard_match(struct device *_dev, struct device_driver *_drv) -{ - struct expansion_card *ec = ECARD_DEV(_dev); - struct ecard_driver *drv = ECARD_DRV(_drv); - int ret; - - if (drv->id_table) { - ret = ecard_match_device(drv->id_table, ec) != NULL; - } else { - ret = ec->cid.id == drv->id; - } - - return ret; -} - -struct bus_type ecard_bus_type = { - .name = "ecard", - .match = ecard_match, -}; - -static int ecard_bus_init(void) -{ - return bus_register(&ecard_bus_type); -} - -postcore_initcall(ecard_bus_init); - -EXPORT_SYMBOL(ecard_readchunk); -EXPORT_SYMBOL(ecard_address); -EXPORT_SYMBOL(ecard_register_driver); -EXPORT_SYMBOL(ecard_remove_driver); -EXPORT_SYMBOL(ecard_bus_type); |