diff options
Diffstat (limited to 'arch/arm/mach-rpc/ecard.c')
| -rw-r--r-- | arch/arm/mach-rpc/ecard.c | 1146 |
1 files changed, 1146 insertions, 0 deletions
diff --git a/arch/arm/mach-rpc/ecard.c b/arch/arm/mach-rpc/ecard.c new file mode 100644 index 000000000..53813f946 --- /dev/null +++ b/arch/arm/mach-rpc/ecard.c @@ -0,0 +1,1146 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/arch/arm/kernel/ecard.c + * + * Copyright 1995-2001 Russell King + * + * 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/module.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/sched/mm.h> +#include <linux/interrupt.h> +#include <linux/completion.h> +#include <linux/reboot.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/device.h> +#include <linux/init.h> +#include <linux/mutex.h> +#include <linux/kthread.h> +#include <linux/irq.h> +#include <linux/io.h> + +#include <asm/dma.h> +#include <asm/ecard.h> +#include <mach/hardware.h> +#include <asm/irq.h> +#include <asm/mmu_context.h> +#include <asm/mach/irq.h> +#include <asm/tlbflush.h> + +#include "ecard.h" + +struct ecard_request { + void (*fn)(struct ecard_request *); + ecard_t *ec; + unsigned int address; + unsigned int length; + unsigned int use_loader; + void *buffer; + struct completion *complete; +}; + +struct expcard_quirklist { + unsigned short manufacturer; + unsigned short product; + const char *type; + void (*init)(ecard_t *ec); +}; + +static ecard_t *cards; +static ecard_t *slot_to_expcard[MAX_ECARDS]; +static unsigned int ectcr; + +static void atomwide_3p_quirk(ecard_t *ec); + +/* List of descriptions of cards which don't have an extended + * identification, or chunk directories containing a description. + */ +static struct expcard_quirklist quirklist[] __initdata = { + { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }, + { MANU_ATOMWIDE, PROD_ATOMWIDE_3PSERIAL, NULL, atomwide_3p_quirk }, +}; + +asmlinkage extern int +ecard_loader_reset(unsigned long base, loader_t loader); +asmlinkage extern int +ecard_loader_read(int off, unsigned long base, loader_t loader); + +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. + */ +static void ecard_task_reset(struct ecard_request *req) +{ + struct expansion_card *ec = req->ec; + struct resource *res; + + res = ec->slot_no == 8 + ? &ec->resource[ECARD_RES_MEMC] + : ec->easi + ? &ec->resource[ECARD_RES_EASI] + : &ec->resource[ECARD_RES_IOCSYNC]; + + ecard_loader_reset(res->start, ec->loader); +} + +static void ecard_task_readbytes(struct ecard_request *req) +{ + struct expansion_card *ec = req->ec; + unsigned char *buf = req->buffer; + unsigned int len = req->length; + unsigned int off = req->address; + + if (ec->slot_no == 8) { + void __iomem *base = (void __iomem *) + ec->resource[ECARD_RES_MEMC].start; + + /* + * 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) { + writeb(0, base); + index = 0; + } + + /* + * Increment the hardware index counter until we get to the + * required offset. The read bytes are discarded. + */ + while (index < off) { + readb(base + page); + index += 1; + } + + while (len--) { + *buf++ = readb(base + page); + index += 1; + } + } else { + unsigned long base = (ec->easi + ? &ec->resource[ECARD_RES_EASI] + : &ec->resource[ECARD_RES_IOCSYNC])->start; + void __iomem *pbase = (void __iomem *)base; + + if (!req->use_loader || !ec->loader) { + off *= 4; + while (len--) { + *buf++ = readb(pbase + 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, + ec->loader); + } + } + } + +} + +static DECLARE_WAIT_QUEUE_HEAD(ecard_wait); +static struct ecard_request *ecard_req; +static DEFINE_MUTEX(ecard_mutex); + +/* + * Set up the expansion card daemon's page tables. + */ +static void ecard_init_pgtables(struct mm_struct *mm) +{ + struct vm_area_struct vma = TLB_FLUSH_VMA(mm, VM_EXEC); + + /* 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; + + src_pgd = pgd_offset(mm, (unsigned long)IO_BASE); + dst_pgd = pgd_offset(mm, IO_START); + + memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE)); + + src_pgd = pgd_offset(mm, (unsigned long)EASI_BASE); + dst_pgd = pgd_offset(mm, EASI_START); + + memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE)); + + flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE); + flush_tlb_range(&vma, 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) +{ + /* + * 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 mm\n"); + + while (1) { + struct ecard_request *req; + + wait_event_interruptible(ecard_wait, ecard_req != NULL); + + req = xchg(&ecard_req, NULL); + if (req != NULL) { + req->fn(req); + complete(req->complete); + } + } +} + +/* + * 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) +{ + DECLARE_COMPLETION_ONSTACK(completion); + + req->complete = &completion; + + mutex_lock(&ecard_mutex); + ecard_req = req; + wake_up(&ecard_wait); + + /* + * Now wait for kecardd to run. + */ + wait_for_completion(&completion); + mutex_unlock(&ecard_mutex); +} + +/* ======================= Mid-level card control ===================== */ + +static void +ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld) +{ + struct ecard_request req; + + req.fn = ecard_task_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 || readb(ec->irqaddr) & 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 || readb(ec->fiqaddr) & 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(struct irq_data *d) +{ + ecard_t *ec = irq_data_get_irq_chip_data(d); + + if (ec) { + if (!ec->ops) + ec->ops = &ecard_default_ops; + + if (ec->claimed && ec->ops->irqenable) + ec->ops->irqenable(ec, d->irq); + else + printk(KERN_ERR "ecard: rejecting request to " + "enable IRQs for %d\n", d->irq); + } +} + +static void ecard_irq_mask(struct irq_data *d) +{ + ecard_t *ec = irq_data_get_irq_chip_data(d); + + if (ec) { + if (!ec->ops) + ec->ops = &ecard_default_ops; + + if (ec->ops && ec->ops->irqdisable) + ec->ops->irqdisable(ec, d->irq); + } +} + +static struct irq_chip ecard_chip = { + .name = "ECARD", + .irq_ack = ecard_irq_mask, + .irq_mask = ecard_irq_mask, + .irq_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(void) +{ + ecard_t *ec; + + printk("Expansion card IRQ state:\n"); + + for (ec = cards; ec; ec = ec->next) { + const char *claimed; + + if (ec->slot_no == 8) + continue; + + claimed = ec->claimed ? "" : "not "; + + if (ec->ops && ec->ops->irqpending && + ec->ops != &ecard_default_ops) + printk(" %d: %sclaimed irq %spending\n", + ec->slot_no, claimed, + ec->ops->irqpending(ec) ? "" : "not "); + else + printk(" %d: %sclaimed irqaddr %p, mask = %02X, status = %02X\n", + ec->slot_no, claimed, + ec->irqaddr, ec->irqmask, readb(ec->irqaddr)); + } +} + +static void ecard_check_lockup(struct irq_desc *desc) +{ + static unsigned long last; + static int lockup; + + /* + * 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->irq_data.chip->irq_mask(&desc->irq_data); + ecard_dump_irq_state(); + } + } 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 backplane\n"); + ecard_dump_irq_state(); + } +} + +static void ecard_irq_handler(struct irq_desc *desc) +{ + ecard_t *ec; + int called = 0; + + desc->irq_data.chip->irq_mask(&desc->irq_data); + for (ec = cards; ec; ec = ec->next) { + int pending; + + if (!ec->claimed || !ec->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) { + generic_handle_irq(ec->irq); + called ++; + } + } + desc->irq_data.chip->irq_unmask(&desc->irq_data); + + if (called == 0) + ecard_check_lockup(desc); +} + +static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed) +{ + void __iomem *address = NULL; + int slot = ec->slot_no; + + if (ec->slot_no == 8) + return ECARD_MEMC8_BASE; + + ectcr &= ~(1 << slot); + + switch (type) { + case ECARD_MEMC: + if (slot < 4) + address = ECARD_MEMC_BASE + (slot << 14); + break; + + case ECARD_IOC: + if (slot < 4) + address = ECARD_IOC_BASE + (slot << 14); + else + address = ECARD_IOC4_BASE + ((slot - 4) << 14); + if (address) + address += speed << 19; + break; + + case ECARD_EASI: + address = ECARD_EASI_BASE + (slot << 24); + if (speed == ECARD_FAST) + ectcr |= 1 << slot; + break; + + default: + break; + } + +#ifdef IOMD_ECTCR + iomd_writeb(ectcr, IOMD_ECTCR); +#endif + return address; +} + +static int ecard_prints(struct seq_file *m, ecard_t *ec) +{ + seq_printf(m, " %d: %s ", ec->slot_no, ec->easi ? "EASI" : " "); + + if (ec->cid.id == 0) { + struct in_chunk_dir incd; + + seq_printf(m, "[%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); + } + + seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*"); + } else + seq_printf(m, "Simple card %d\n", ec->cid.id); + + return 0; +} + +static int ecard_devices_proc_show(struct seq_file *m, void *v) +{ + ecard_t *ec = cards; + + while (ec) { + ecard_prints(m, ec); + ec = ec->next; + } + return 0; +} + +static struct proc_dir_entry *proc_bus_ecard_dir = NULL; + +static void ecard_proc_init(void) +{ + proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL); + proc_create_single("devices", 0, proc_bus_ecard_dir, + ecard_devices_proc_show); +} + +#define ec_set_resource(ec,nr,st,sz) \ + do { \ + (ec)->resource[nr].name = dev_name(&ec->dev); \ + (ec)->resource[nr].start = st; \ + (ec)->resource[nr].end = (st) + (sz) - 1; \ + (ec)->resource[nr].flags = IORESOURCE_MEM; \ + } while (0) + +static void __init ecard_free_card(struct expansion_card *ec) +{ + int i; + + for (i = 0; i < ECARD_NUM_RESOURCES; i++) + if (ec->resource[i].flags) + release_resource(&ec->resource[i]); + + kfree(ec); +} + +static struct expansion_card *__init ecard_alloc_card(int type, int slot) +{ + struct expansion_card *ec; + unsigned long base; + int i; + + ec = kzalloc(sizeof(ecard_t), GFP_KERNEL); + if (!ec) { + ec = ERR_PTR(-ENOMEM); + goto nomem; + } + + ec->slot_no = slot; + ec->easi = type == ECARD_EASI; + ec->irq = 0; + ec->fiq = 0; + ec->dma = NO_DMA; + ec->ops = &ecard_default_ops; + + dev_set_name(&ec->dev, "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; + ec->dev.coherent_dma_mask = ec->dma_mask; + + if (slot < 4) { + ec_set_resource(ec, ECARD_RES_MEMC, + PODSLOT_MEMC_BASE + (slot << 14), + PODSLOT_MEMC_SIZE); + base = PODSLOT_IOC0_BASE + (slot << 14); + } else + base = PODSLOT_IOC4_BASE + ((slot - 4) << 14); + +#ifdef CONFIG_ARCH_RPC + if (slot < 8) { + ec_set_resource(ec, ECARD_RES_EASI, + PODSLOT_EASI_BASE + (slot << 24), + PODSLOT_EASI_SIZE); + } + + if (slot == 8) { + ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE); + } else +#endif + + for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) + ec_set_resource(ec, i + ECARD_RES_IOCSLOW, + base + (i << 19), PODSLOT_IOC_SIZE); + + for (i = 0; i < ECARD_NUM_RESOURCES; i++) { + if (ec->resource[i].flags && + request_resource(&iomem_resource, &ec->resource[i])) { + dev_err(&ec->dev, "resource(s) not available\n"); + ec->resource[i].end -= ec->resource[i].start; + ec->resource[i].start = 0; + ec->resource[i].flags = 0; + } + } + + nomem: + return ec; +} + +static ssize_t irq_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct expansion_card *ec = ECARD_DEV(dev); + return sprintf(buf, "%u\n", ec->irq); +} +static DEVICE_ATTR_RO(irq); + +static ssize_t dma_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct expansion_card *ec = ECARD_DEV(dev); + return sprintf(buf, "%u\n", ec->dma); +} +static DEVICE_ATTR_RO(dma); + +static ssize_t resource_show(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, "%08x %08x %08lx\n", + ec->resource[i].start, + ec->resource[i].end, + ec->resource[i].flags); + + return str - buf; +} +static DEVICE_ATTR_RO(resource); + +static ssize_t vendor_show(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 DEVICE_ATTR_RO(vendor); + +static ssize_t device_show(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 DEVICE_ATTR_RO(device); + +static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct expansion_card *ec = ECARD_DEV(dev); + return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC"); +} +static DEVICE_ATTR_RO(type); + +static struct attribute *ecard_dev_attrs[] = { + &dev_attr_device.attr, + &dev_attr_dma.attr, + &dev_attr_irq.attr, + &dev_attr_resource.attr, + &dev_attr_type.attr, + &dev_attr_vendor.attr, + NULL, +}; +ATTRIBUTE_GROUPS(ecard_dev); + +int ecard_request_resources(struct expansion_card *ec) +{ + int i, err = 0; + + for (i = 0; i < ECARD_NUM_RESOURCES; i++) { + if (ecard_resource_end(ec, i) && + !request_mem_region(ecard_resource_start(ec, i), + ecard_resource_len(ec, i), + ec->dev.driver->name)) { + err = -EBUSY; + break; + } + } + + if (err) { + while (i--) + if (ecard_resource_end(ec, i)) + release_mem_region(ecard_resource_start(ec, i), + ecard_resource_len(ec, i)); + } + return err; +} +EXPORT_SYMBOL(ecard_request_resources); + +void ecard_release_resources(struct expansion_card *ec) +{ + int i; + + for (i = 0; i < ECARD_NUM_RESOURCES; i++) + if (ecard_resource_end(ec, i)) + release_mem_region(ecard_resource_start(ec, i), + ecard_resource_len(ec, i)); +} +EXPORT_SYMBOL(ecard_release_resources); + +void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data) +{ + ec->irq_data = irq_data; + barrier(); + ec->ops = ops; +} +EXPORT_SYMBOL(ecard_setirq); + +void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res, + unsigned long offset, unsigned long maxsize) +{ + unsigned long start = ecard_resource_start(ec, res); + unsigned long end = ecard_resource_end(ec, res); + + if (offset > (end - start)) + return NULL; + + start += offset; + if (maxsize && end - start > maxsize) + end = start + maxsize; + + return devm_ioremap(&ec->dev, start, end - start); +} +EXPORT_SYMBOL(ecardm_iomap); + +static void atomwide_3p_quirk(ecard_t *ec) +{ + void __iomem *addr = __ecard_address(ec, ECARD_IOC, ECARD_SYNC); + unsigned int i; + + /* Disable interrupts on each port */ + for (i = 0x2000; i <= 0x2800; i += 0x0400) + writeb(0, addr + i + 4); +} + +/* + * 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, unsigned irq, card_type_t type) +{ + ecard_t **ecp; + ecard_t *ec; + struct ex_ecid cid; + void __iomem *addr; + int i, rc; + + ec = ecard_alloc_card(type, slot); + if (IS_ERR(ec)) { + rc = PTR_ERR(ec); + goto nomem; + } + + rc = -ENODEV; + if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL) + 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 = addr; + + 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(quirklist); i++) + if (quirklist[i].manufacturer == ec->cid.manufacturer && + quirklist[i].product == ec->cid.product) { + if (quirklist[i].type) + ec->card_desc = quirklist[i].type; + if (quirklist[i].init) + quirklist[i].init(ec); + break; + } + + ec->irq = irq; + + /* + * hook the interrupt handlers + */ + if (slot < 8) { + irq_set_chip_and_handler(ec->irq, &ecard_chip, + handle_level_irq); + irq_set_chip_data(ec->irq, ec); + irq_clear_status_flags(ec->irq, IRQ_NOREQUEST); + } + +#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; + + rc = device_register(&ec->dev); + if (rc) + goto nodev; + + return 0; + + nodev: + ecard_free_card(ec); + nomem: + return rc; +} + +/* + * Initialise the expansion card system. + * Locate all hardware - interrupt management and + * actual cards. + */ +static int __init ecard_init(void) +{ + struct task_struct *task; + int slot, irqbase; + + irqbase = irq_alloc_descs(-1, 0, 8, -1); + if (irqbase < 0) + return irqbase; + + task = kthread_run(ecard_task, NULL, "kecardd"); + if (IS_ERR(task)) { + printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n", + PTR_ERR(task)); + irq_free_descs(irqbase, 8); + return PTR_ERR(task); + } + + printk("Probing expansion cards\n"); + + for (slot = 0; slot < 8; slot ++) { + if (ecard_probe(slot, irqbase + slot, ECARD_EASI) == -ENODEV) + ecard_probe(slot, irqbase + slot, ECARD_IOC); + } + + ecard_probe(8, 11, ECARD_IOC); + + irq_set_chained_handler(IRQ_EXPANSIONCARD, 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); + + ec->claimed = 1; + ret = drv->probe(ec, id); + if (ret) + ec->claimed = 0; + return ret; +} + +static void ecard_drv_remove(struct device *dev) +{ + struct expansion_card *ec = ECARD_DEV(dev); + struct ecard_driver *drv = ECARD_DRV(dev->driver); + + drv->remove(ec); + ec->claimed = 0; + + /* + * Restore the default operations. We ensure that the + * ops are set before we change the data. + */ + ec->ops = &ecard_default_ops; + barrier(); + ec->irq_data = NULL; +} + +/* + * 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 (dev->driver) { + if (drv->shutdown) + drv->shutdown(ec); + ec->claimed = 0; + } + + /* + * If this card has a loader, call the reset handler. + */ + if (ec->loader) { + req.fn = ecard_task_reset; + req.ec = ec; + ecard_call(&req); + } +} + +int ecard_register_driver(struct ecard_driver *drv) +{ + drv->drv.bus = &ecard_bus_type; + + 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", + .dev_groups = ecard_dev_groups, + .match = ecard_match, + .probe = ecard_drv_probe, + .remove = ecard_drv_remove, + .shutdown = ecard_drv_shutdown, +}; + +static int ecard_bus_init(void) +{ + return bus_register(&ecard_bus_type); +} + +postcore_initcall(ecard_bus_init); + +EXPORT_SYMBOL(ecard_readchunk); +EXPORT_SYMBOL(ecard_register_driver); +EXPORT_SYMBOL(ecard_remove_driver); +EXPORT_SYMBOL(ecard_bus_type); |