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linux-sg2042/arch/arm26/kernel/ecard.c

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/*
* 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/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/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 = (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)
{
}
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 = 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;
}
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);
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