// SPDX-License-Identifier: GPL-2.0-only /* * PCMCIA 16-bit resource management functions * * The initial developer of the original code is David A. Hinds * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds * are Copyright (C) 1999 David A. Hinds. All Rights Reserved. * * Copyright (C) 1999 David A. Hinds * Copyright (C) 2004-2010 Dominik Brodowski
*/
/* Access speed for IO windows */ staticint io_speed;
module_param(io_speed, int, 0444);
int pcmcia_validate_mem(struct pcmcia_socket *s)
{ if (s->resource_ops->validate_mem) return s->resource_ops->validate_mem(s); /* if there is no callback, we can assume that everything is OK */ return 0;
}
/** * release_io_space() - release IO ports allocated with alloc_io_space() * @s: pcmcia socket * @res: resource to release *
*/ staticvoid release_io_space(struct pcmcia_socket *s, struct resource *res)
{
resource_size_t num = resource_size(res); int i;
dev_dbg(&s->dev, "release_io_space for %pR\n", res);
for (i = 0; i < MAX_IO_WIN; i++) { if (!s->io[i].res) continue; if ((s->io[i].res->start <= res->start) &&
(s->io[i].res->end >= res->end)) {
s->io[i].InUse -= num; if (res->parent)
release_resource(res);
res->start = res->end = 0;
res->flags = IORESOURCE_IO; /* Free the window if no one else is using it */ if (s->io[i].InUse == 0) {
release_resource(s->io[i].res);
kfree(s->io[i].res);
s->io[i].res = NULL;
}
}
}
}
/** * alloc_io_space() - allocate IO ports for use by a PCMCIA device * @s: pcmcia socket * @res: resource to allocate (begin: begin, end: size) * @lines: number of IO lines decoded by the PCMCIA card * * Special stuff for managing IO windows, because they are scarce
*/ staticint alloc_io_space(struct pcmcia_socket *s, struct resource *res, unsignedint lines)
{ unsignedint align; unsignedint base = res->start; unsignedint num = res->end; int ret;
res->flags |= IORESOURCE_IO;
dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n",
res, lines);
ret = s->resource_ops->find_io(s, res->flags, &base, num, align,
&res->parent); if (ret) {
dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret); return -EINVAL;
}
res->start = base;
res->end = res->start + num - 1;
if (res->parent) {
ret = request_resource(res->parent, res); if (ret) {
dev_warn(&s->dev, "request_resource %pR failed: %d\n", res, ret);
res->parent = NULL;
release_io_space(s, res);
}
}
dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res); return ret;
}
/* * pcmcia_access_config() - read or write card configuration registers * * pcmcia_access_config() reads and writes configuration registers in * attribute memory. Memory window 0 is reserved for this and the tuple * reading services. Drivers must use pcmcia_read_config_byte() or * pcmcia_write_config_byte().
*/ staticint pcmcia_access_config(struct pcmcia_device *p_dev,
off_t where, u8 *val, int (*accessf) (struct pcmcia_socket *s, int attr, unsignedint addr, unsignedint len, void *ptr))
{ struct pcmcia_socket *s;
config_t *c; int addr; int ret = 0;
s = p_dev->socket;
mutex_lock(&s->ops_mutex);
c = p_dev->function_config;
/* * pcmcia_read_config_byte() - read a byte from a card configuration register * * pcmcia_read_config_byte() reads a byte from a configuration register in * attribute memory.
*/ int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val)
{ return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem);
}
EXPORT_SYMBOL(pcmcia_read_config_byte);
/* * pcmcia_write_config_byte() - write a byte to a card configuration register * * pcmcia_write_config_byte() writes a byte to a configuration register in * attribute memory.
*/ int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
{ return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem);
}
EXPORT_SYMBOL(pcmcia_write_config_byte);
/** * pcmcia_map_mem_page() - modify iomem window to point to a different offset * @p_dev: pcmcia device * @res: iomem resource already enabled by pcmcia_request_window() * @offset: card_offset to map * * pcmcia_map_mem_page() modifies what can be read and written by accessing * an iomem range previously enabled by pcmcia_request_window(), by setting * the card_offset value to @offset.
*/ int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res, unsignedint offset)
{ struct pcmcia_socket *s = p_dev->socket; unsignedint w; int ret;
w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1; if (w >= MAX_WIN) return -EINVAL;
mutex_lock(&s->ops_mutex);
s->win[w].card_start = offset;
ret = s->ops->set_mem_map(s, &s->win[w]); if (ret)
dev_warn(&p_dev->dev, "failed to set_mem_map\n");
mutex_unlock(&s->ops_mutex); return ret;
}
EXPORT_SYMBOL(pcmcia_map_mem_page);
/** * pcmcia_fixup_iowidth() - reduce io width to 8bit * @p_dev: pcmcia device * * pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the * IO width to 8bit after having called pcmcia_enable_device() * previously.
*/ int pcmcia_fixup_iowidth(struct pcmcia_device *p_dev)
{ struct pcmcia_socket *s = p_dev->socket;
pccard_io_map io_off = { 0, 0, 0, 0, 1 };
pccard_io_map io_on; int i, ret = 0;
mutex_lock(&s->ops_mutex);
dev_dbg(&p_dev->dev, "fixup iowidth to 8bit\n");
if (!(s->state & SOCKET_PRESENT) ||
!(p_dev->function_config->state & CONFIG_LOCKED)) {
dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
ret = -EACCES; goto unlock;
}
io_on.speed = io_speed; for (i = 0; i < MAX_IO_WIN; i++) { if (!s->io[i].res) continue;
io_off.map = i;
io_on.map = i;
/** * pcmcia_fixup_vpp() - set Vpp to a new voltage level * @p_dev: pcmcia device * @new_vpp: new Vpp voltage * * pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to * a new voltage level between calls to pcmcia_enable_device() * and pcmcia_disable_device().
*/ int pcmcia_fixup_vpp(struct pcmcia_device *p_dev, unsignedchar new_vpp)
{ struct pcmcia_socket *s = p_dev->socket; int ret = 0;
mutex_lock(&s->ops_mutex);
dev_dbg(&p_dev->dev, "fixup Vpp to %d\n", new_vpp);
if (!(s->state & SOCKET_PRESENT) ||
!(p_dev->function_config->state & CONFIG_LOCKED)) {
dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
ret = -EACCES; goto unlock;
}
s->socket.Vpp = new_vpp; if (s->ops->set_socket(s, &s->socket)) {
dev_warn(&p_dev->dev, "Unable to set VPP\n");
ret = -EIO; goto unlock;
}
p_dev->vpp = new_vpp;
unlock:
mutex_unlock(&s->ops_mutex);
return ret;
}
EXPORT_SYMBOL(pcmcia_fixup_vpp);
/** * pcmcia_release_configuration() - physically disable a PCMCIA device * @p_dev: pcmcia device * * pcmcia_release_configuration() is the 1:1 counterpart to * pcmcia_enable_device(): If a PCMCIA device is no longer used by any * driver, the Vpp voltage is set to 0, IRQs will no longer be generated, * and I/O ranges will be disabled. As pcmcia_release_io() and * pcmcia_release_window() still need to be called, device drivers are * expected to call pcmcia_disable_device() instead.
*/ int pcmcia_release_configuration(struct pcmcia_device *p_dev)
{
pccard_io_map io = { 0, 0, 0, 0, 1 }; struct pcmcia_socket *s = p_dev->socket;
config_t *c; int i;
mutex_lock(&s->ops_mutex);
c = p_dev->function_config; if (p_dev->_locked) {
p_dev->_locked = 0; if (--(s->lock_count) == 0) {
s->socket.flags = SS_OUTPUT_ENA; /* Is this correct? */
s->socket.Vpp = 0;
s->socket.io_irq = 0;
s->ops->set_socket(s, &s->socket);
}
} if (c->state & CONFIG_LOCKED) {
c->state &= ~CONFIG_LOCKED; if (c->state & CONFIG_IO_REQ) for (i = 0; i < MAX_IO_WIN; i++) { if (!s->io[i].res) continue;
s->io[i].Config--; if (s->io[i].Config != 0) continue;
io.map = i;
s->ops->set_io_map(s, &io);
}
}
mutex_unlock(&s->ops_mutex);
return 0;
}
/** * pcmcia_release_io() - release I/O allocated by a PCMCIA device * @p_dev: pcmcia device * * pcmcia_release_io() releases the I/O ranges allocated by a PCMCIA * device. This may be invoked some time after a card ejection has * already dumped the actual socket configuration, so if the client is * "stale", we don't bother checking the port ranges against the * current socket values.
*/ staticvoid pcmcia_release_io(struct pcmcia_device *p_dev)
{ struct pcmcia_socket *s = p_dev->socket;
config_t *c;
mutex_lock(&s->ops_mutex); if (!p_dev->_io) goto out;
/** * pcmcia_enable_device() - set up and activate a PCMCIA device * @p_dev: the associated PCMCIA device * * pcmcia_enable_device() physically enables a PCMCIA device. It parses * the flags passed to in @flags and stored in @p_dev->flags and sets up * the Vpp voltage, enables the speaker line, I/O ports and store proper * values to configuration registers.
*/ int pcmcia_enable_device(struct pcmcia_device *p_dev)
{ int i; unsignedint base; struct pcmcia_socket *s = p_dev->socket;
config_t *c;
pccard_io_map iomap; unsignedchar status = 0; unsignedchar ext_status = 0; unsignedchar option = 0; unsignedint flags = p_dev->config_flags;
if (!(s->state & SOCKET_PRESENT)) return -ENODEV;
mutex_lock(&s->ops_mutex);
c = p_dev->function_config; if (c->state & CONFIG_LOCKED) {
mutex_unlock(&s->ops_mutex);
dev_dbg(&p_dev->dev, "Configuration is locked\n"); return -EACCES;
}
/* Do power control. We don't allow changes in Vcc. */
s->socket.Vpp = p_dev->vpp; if (s->ops->set_socket(s, &s->socket)) {
mutex_unlock(&s->ops_mutex);
dev_warn(&p_dev->dev, "Unable to set socket state\n"); return -EINVAL;
}
/* Pick memory or I/O card, DMA mode, interrupt */ if (p_dev->_io || flags & CONF_ENABLE_IRQ)
flags |= CONF_ENABLE_IOCARD; if (flags & CONF_ENABLE_IOCARD)
s->socket.flags |= SS_IOCARD; if (flags & CONF_ENABLE_ZVCARD)
s->socket.flags |= SS_ZVCARD | SS_IOCARD; if (flags & CONF_ENABLE_SPKR) {
s->socket.flags |= SS_SPKR_ENA;
status = CCSR_AUDIO_ENA; if (!(p_dev->config_regs & PRESENT_STATUS))
dev_warn(&p_dev->dev, "speaker requested, but " "PRESENT_STATUS not set!\n");
} if (flags & CONF_ENABLE_IRQ)
s->socket.io_irq = s->pcmcia_irq; else
s->socket.io_irq = 0; if (flags & CONF_ENABLE_ESR) {
p_dev->config_regs |= PRESENT_EXT_STATUS;
ext_status = ESR_REQ_ATTN_ENA;
}
s->ops->set_socket(s, &s->socket);
s->lock_count++;
dev_dbg(&p_dev->dev, "enable_device: V %d, flags %x, base %x, regs %x, idx %x\n",
p_dev->vpp, flags, p_dev->config_base, p_dev->config_regs,
p_dev->config_index);
/** * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices * @p_dev: the associated PCMCIA device * * pcmcia_request_io() attempts to reserve the IO port ranges specified in * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The * "start" value is the requested start of the IO port resource; "end" * reflects the number of ports requested. The number of IO lines requested * is specified in &struct pcmcia_device @p_dev->io_lines.
*/ int pcmcia_request_io(struct pcmcia_device *p_dev)
{ struct pcmcia_socket *s = p_dev->socket;
config_t *c = p_dev->function_config; int ret = -EINVAL;
/** * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device * @p_dev: the associated PCMCIA device * @handler: IRQ handler to register * * pcmcia_request_irq() is a wrapper around request_irq() which allows * the PCMCIA core to clean up the registration in pcmcia_disable_device(). * Drivers are free to use request_irq() directly, but then they need to * call free_irq() themselves, too. Also, only %IRQF_SHARED capable IRQ * handlers are allowed.
*/ int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
irq_handler_t handler)
{ int ret;
if (!p_dev->irq) return -EINVAL;
ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
p_dev->devname, p_dev->priv); if (!ret)
p_dev->_irq = 1;
return ret;
}
EXPORT_SYMBOL(pcmcia_request_irq);
#ifdef CONFIG_PCMCIA_PROBE
/* mask of IRQs already reserved by other cards, we should avoid using them */ static u8 pcmcia_used_irq[32];
/** * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used * @p_dev: the associated PCMCIA device * @type: IRQ type (flags) * * locking note: must be called with ops_mutex locked.
*/ staticint pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
{ struct pcmcia_socket *s = p_dev->socket; unsignedinttry, irq;
u32 mask = s->irq_mask; int ret = -ENODEV;
for (try = 0; try < 64; try++) {
irq = try % 32;
if (irq > NR_IRQS) continue;
/* marked as available by driver, not blocked by userspace? */ if (!((mask >> irq) & 1)) continue;
/* avoid an IRQ which is already used by another PCMCIA card */ if ((try < 32) && pcmcia_used_irq[irq]) continue;
/* register the correct driver, if possible, to check whether * registering a dummy handle works, i.e. if the IRQ isn't
* marked as used by the kernel resource management core */
ret = request_irq(irq, test_action, type, p_dev->devname,
p_dev); if (!ret) {
free_irq(irq, p_dev);
p_dev->irq = s->pcmcia_irq = irq;
pcmcia_used_irq[irq]++; break;
}
}
/** * pcmcia_setup_irq() - determine IRQ to be used for device * @p_dev: the associated PCMCIA device * * locking note: must be called with ops_mutex locked.
*/ int pcmcia_setup_irq(struct pcmcia_device *p_dev)
{ struct pcmcia_socket *s = p_dev->socket;
/* prefer an exclusive ISA irq */ if (!pcmcia_setup_isa_irq(p_dev, 0)) return 0;
/* but accept a shared ISA irq */ if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED)) return 0;
/* but use the PCI irq otherwise */ if (s->pci_irq) {
p_dev->irq = s->pcmcia_irq = s->pci_irq; return 0;
}
return -EINVAL;
}
/** * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices * @p_dev: the associated PCMCIA device * @res: &struct resource pointing to p_dev->resource[2..5] * @speed: access speed * * pcmcia_request_window() attepts to reserve an iomem ranges specified in * &struct resource @res pointing to one of the entries in * &struct pcmcia_device @p_dev->resource[2..5]. The "start" value is the * requested start of the IO mem resource; "end" reflects the size * requested.
*/ int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res, unsignedint speed)
{ struct pcmcia_socket *s = p_dev->socket;
pccard_mem_map *win;
u_long align; int w;
if (!(s->state & SOCKET_PRESENT)) {
dev_dbg(&p_dev->dev, "No card present\n"); return -ENODEV;
}
/* Window size defaults to smallest available */ if (res->end == 0)
res->end = s->map_size;
align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size; if (res->end & (s->map_size-1)) {
dev_dbg(&p_dev->dev, "invalid map size\n"); return -EINVAL;
} if ((res->start && (s->features & SS_CAP_STATIC_MAP)) ||
(res->start & (align-1))) {
dev_dbg(&p_dev->dev, "invalid base address\n"); return -EINVAL;
} if (res->start)
align = 0;
/* Allocate system memory window */
mutex_lock(&s->ops_mutex); for (w = 0; w < MAX_WIN; w++) if (!(s->state & SOCKET_WIN_REQ(w))) break; if (w == MAX_WIN) {
dev_dbg(&p_dev->dev, "all windows are used already\n");
mutex_unlock(&s->ops_mutex); return -EINVAL;
}
win = &s->win[w];
if (!(s->features & SS_CAP_STATIC_MAP)) {
win->res = pcmcia_find_mem_region(res->start, res->end, align,
0, s); if (!win->res) {
dev_dbg(&p_dev->dev, "allocating mem region failed\n");
mutex_unlock(&s->ops_mutex); return -EINVAL;
}
}
p_dev->_win |= CLIENT_WIN_REQ(w);
/** * pcmcia_disable_device() - disable and clean up a PCMCIA device * @p_dev: the associated PCMCIA device * * pcmcia_disable_device() is the driver-callable counterpart to * pcmcia_enable_device(): If a PCMCIA device is no longer used, * drivers are expected to clean up and disable the device by calling * this function. Any I/O ranges (iomem and ioports) will be released, * the Vpp voltage will be set to 0, and IRQs will no longer be * generated -- at least if there is no other card function (of * multifunction devices) being used.
*/ void pcmcia_disable_device(struct pcmcia_device *p_dev)
{ int i;
dev_dbg(&p_dev->dev, "disabling device\n");
for (i = 0; i < MAX_WIN; i++) { struct resource *res = p_dev->resource[MAX_IO_WIN + i]; if (res->flags & WIN_FLAGS_REQ)
pcmcia_release_window(p_dev, res);
}
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.