diff options
Diffstat (limited to 'kernel/drivers/pcmcia/pcmcia_resource.c')
| -rw-r--r-- | kernel/drivers/pcmcia/pcmcia_resource.c | 1000 |
1 files changed, 1000 insertions, 0 deletions
diff --git a/kernel/drivers/pcmcia/pcmcia_resource.c b/kernel/drivers/pcmcia/pcmcia_resource.c new file mode 100644 index 000000000..e8c19def1 --- /dev/null +++ b/kernel/drivers/pcmcia/pcmcia_resource.c @@ -0,0 +1,1000 @@ +/* + * 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 + * + * 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. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/pci.h> +#include <linux/device.h> +#include <linux/netdevice.h> +#include <linux/slab.h> + +#include <asm/irq.h> + +#include <pcmcia/ss.h> +#include <pcmcia/cistpl.h> +#include <pcmcia/cisreg.h> +#include <pcmcia/ds.h> + +#include "cs_internal.h" + + +/* Access speed for IO windows */ +static int 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; +} + +struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align, + int low, struct pcmcia_socket *s) +{ + if (s->resource_ops->find_mem) + return s->resource_ops->find_mem(base, num, align, low, s); + return NULL; +} + + +/** + * release_io_space() - release IO ports allocated with alloc_io_space() + * @s: pcmcia socket + * @res: resource to release + * + */ +static void 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 + */ +static int alloc_io_space(struct pcmcia_socket *s, struct resource *res, + unsigned int lines) +{ + unsigned int align; + unsigned int base = res->start; + unsigned int num = res->end; + int ret; + + res->flags |= IORESOURCE_IO; + + dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n", + res, lines); + + align = base ? (lines ? 1<<lines : 0) : 1; + if (align && (align < num)) { + if (base) { + dev_dbg(&s->dev, "odd IO request\n"); + align = 0; + } else + while (align && (align < num)) + align <<= 1; + } + if (base & ~(align-1)) { + dev_dbg(&s->dev, "odd IO request\n"); + align = 0; + } + + 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(). + */ +static int pcmcia_access_config(struct pcmcia_device *p_dev, + off_t where, u8 *val, + int (*accessf) (struct pcmcia_socket *s, + int attr, unsigned int addr, + unsigned int 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; + + if (!(c->state & CONFIG_LOCKED)) { + dev_dbg(&p_dev->dev, "Configuration isn't locked\n"); + mutex_unlock(&s->ops_mutex); + return -EACCES; + } + + addr = (p_dev->config_base + where) >> 1; + + ret = accessf(s, 1, addr, 1, val); + + mutex_unlock(&s->ops_mutex); + + return ret; +} + + +/** + * 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, + unsigned int offset) +{ + struct pcmcia_socket *s = p_dev->socket; + unsigned int 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; + + io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8; + io_on.start = s->io[i].res->start; + io_on.stop = s->io[i].res->end; + + s->ops->set_io_map(s, &io_off); + mdelay(40); + s->ops->set_io_map(s, &io_on); + } +unlock: + mutex_unlock(&s->ops_mutex); + + return ret; +} +EXPORT_SYMBOL(pcmcia_fixup_iowidth); + + +/** + * 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, unsigned char 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. + */ +static int pcmcia_release_io(struct pcmcia_device *p_dev) +{ + struct pcmcia_socket *s = p_dev->socket; + int ret = -EINVAL; + config_t *c; + + mutex_lock(&s->ops_mutex); + if (!p_dev->_io) + goto out; + + c = p_dev->function_config; + + release_io_space(s, &c->io[0]); + + if (c->io[1].end) + release_io_space(s, &c->io[1]); + + p_dev->_io = 0; + c->state &= ~CONFIG_IO_REQ; + +out: + mutex_unlock(&s->ops_mutex); + + return ret; +} /* pcmcia_release_io */ + + +/** + * pcmcia_release_window() - release reserved iomem for PCMCIA devices + * @p_dev: pcmcia device + * @res: iomem resource to release + * + * pcmcia_release_window() releases &struct resource *res which was + * previously reserved by calling pcmcia_request_window(). + */ +int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res) +{ + struct pcmcia_socket *s = p_dev->socket; + pccard_mem_map *win; + unsigned int w; + + dev_dbg(&p_dev->dev, "releasing window %pR\n", res); + + w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1; + if (w >= MAX_WIN) + return -EINVAL; + + mutex_lock(&s->ops_mutex); + win = &s->win[w]; + + if (!(p_dev->_win & CLIENT_WIN_REQ(w))) { + dev_dbg(&p_dev->dev, "not releasing unknown window\n"); + mutex_unlock(&s->ops_mutex); + return -EINVAL; + } + + /* Shut down memory window */ + win->flags &= ~MAP_ACTIVE; + s->ops->set_mem_map(s, win); + s->state &= ~SOCKET_WIN_REQ(w); + + /* Release system memory */ + if (win->res) { + release_resource(res); + release_resource(win->res); + kfree(win->res); + win->res = NULL; + } + res->start = res->end = 0; + res->flags = IORESOURCE_MEM; + p_dev->_win &= ~CLIENT_WIN_REQ(w); + mutex_unlock(&s->ops_mutex); + + return 0; +} /* pcmcia_release_window */ +EXPORT_SYMBOL(pcmcia_release_window); + + +/** + * 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; + unsigned int base; + struct pcmcia_socket *s = p_dev->socket; + config_t *c; + pccard_io_map iomap; + unsigned char status = 0; + unsigned char ext_status = 0; + unsigned char option = 0; + unsigned int 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_printk(KERN_WARNING, &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); + + /* Set up CIS configuration registers */ + base = p_dev->config_base; + if (p_dev->config_regs & PRESENT_COPY) { + u16 tmp = 0; + dev_dbg(&p_dev->dev, "clearing CISREG_SCR\n"); + pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &tmp); + } + if (p_dev->config_regs & PRESENT_PIN_REPLACE) { + u16 tmp = 0; + dev_dbg(&p_dev->dev, "clearing CISREG_PRR\n"); + pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &tmp); + } + if (p_dev->config_regs & PRESENT_OPTION) { + if (s->functions == 1) { + option = p_dev->config_index & COR_CONFIG_MASK; + } else { + option = p_dev->config_index & COR_MFC_CONFIG_MASK; + option |= COR_FUNC_ENA|COR_IREQ_ENA; + if (p_dev->config_regs & PRESENT_IOBASE_0) + option |= COR_ADDR_DECODE; + } + if ((flags & CONF_ENABLE_IRQ) && + !(flags & CONF_ENABLE_PULSE_IRQ)) + option |= COR_LEVEL_REQ; + pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &option); + mdelay(40); + } + if (p_dev->config_regs & PRESENT_STATUS) + pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &status); + + if (p_dev->config_regs & PRESENT_EXT_STATUS) + pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, + &ext_status); + + if (p_dev->config_regs & PRESENT_IOBASE_0) { + u8 b = c->io[0].start & 0xff; + pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b); + b = (c->io[0].start >> 8) & 0xff; + pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b); + } + if (p_dev->config_regs & PRESENT_IOSIZE) { + u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1; + pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b); + } + + /* Configure I/O windows */ + if (c->state & CONFIG_IO_REQ) { + iomap.speed = io_speed; + for (i = 0; i < MAX_IO_WIN; i++) + if (s->io[i].res) { + iomap.map = i; + iomap.flags = MAP_ACTIVE; + switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) { + case IO_DATA_PATH_WIDTH_16: + iomap.flags |= MAP_16BIT; break; + case IO_DATA_PATH_WIDTH_AUTO: + iomap.flags |= MAP_AUTOSZ; break; + default: + break; + } + iomap.start = s->io[i].res->start; + iomap.stop = s->io[i].res->end; + s->ops->set_io_map(s, &iomap); + s->io[i].Config++; + } + } + + c->state |= CONFIG_LOCKED; + p_dev->_locked = 1; + mutex_unlock(&s->ops_mutex); + return 0; +} /* pcmcia_enable_device */ +EXPORT_SYMBOL(pcmcia_enable_device); + + +/** + * 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; + + mutex_lock(&s->ops_mutex); + dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR", + &c->io[0], &c->io[1]); + + if (!(s->state & SOCKET_PRESENT)) { + dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n"); + goto out; + } + + if (c->state & CONFIG_LOCKED) { + dev_dbg(&p_dev->dev, "Configuration is locked\n"); + goto out; + } + if (c->state & CONFIG_IO_REQ) { + dev_dbg(&p_dev->dev, "IO already configured\n"); + goto out; + } + + ret = alloc_io_space(s, &c->io[0], p_dev->io_lines); + if (ret) + goto out; + + if (c->io[1].end) { + ret = alloc_io_space(s, &c->io[1], p_dev->io_lines); + if (ret) { + struct resource tmp = c->io[0]; + /* release the previously allocated resource */ + release_io_space(s, &c->io[0]); + /* but preserve the settings, for they worked... */ + c->io[0].end = resource_size(&tmp); + c->io[0].start = tmp.start; + c->io[0].flags = tmp.flags; + goto out; + } + } else + c->io[1].start = 0; + + c->state |= CONFIG_IO_REQ; + p_dev->_io = 1; + + dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR", + &c->io[0], &c->io[1]); +out: + mutex_unlock(&s->ops_mutex); + + return ret; +} /* pcmcia_request_io */ +EXPORT_SYMBOL(pcmcia_request_io); + + +/** + * 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() themselfves, 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); + + +/** + * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first + * @p_dev: the associated PCMCIA device + * @handler: IRQ handler to register + * + * pcmcia_request_exclusive_irq() is a wrapper around request_irq() which + * attempts first to request an exclusive IRQ. If it fails, it also accepts + * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for + * IRQ sharing and either use request_irq directly (then they need to call + * free_irq() themselves, too), or the pcmcia_request_irq() function. + */ +int __must_check +__pcmcia_request_exclusive_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, 0, p_dev->devname, p_dev->priv); + if (ret) { + ret = pcmcia_request_irq(p_dev, handler); + dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: " + "request for exclusive IRQ could not be fulfilled.\n"); + dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver " + "needs updating to supported shared IRQ lines.\n"); + } + if (ret) + dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n"); + else + p_dev->_irq = 1; + + return ret; +} /* pcmcia_request_exclusive_irq */ +EXPORT_SYMBOL(__pcmcia_request_exclusive_irq); + + +#ifdef CONFIG_PCMCIA_PROBE + +/* mask of IRQs already reserved by other cards, we should avoid using them */ +static u8 pcmcia_used_irq[32]; + +static irqreturn_t test_action(int cpl, void *dev_id) +{ + return IRQ_NONE; +} + +/** + * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used + * @p_dev - the associated PCMCIA device + * + * locking note: must be called with ops_mutex locked. + */ +static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type) +{ + struct pcmcia_socket *s = p_dev->socket; + unsigned int try, 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; + } + } + + return ret; +} + +void pcmcia_cleanup_irq(struct pcmcia_socket *s) +{ + pcmcia_used_irq[s->pcmcia_irq]--; + s->pcmcia_irq = 0; +} + +#else /* CONFIG_PCMCIA_PROBE */ + +static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type) +{ + return -EINVAL; +} + +void pcmcia_cleanup_irq(struct pcmcia_socket *s) +{ + s->pcmcia_irq = 0; + return; +} + +#endif /* CONFIG_PCMCIA_PROBE */ + + +/** + * 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; + + if (p_dev->irq) + return 0; + + /* already assigned? */ + if (s->pcmcia_irq) { + p_dev->irq = s->pcmcia_irq; + return 0; + } + + /* 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, + unsigned int speed) +{ + struct pcmcia_socket *s = p_dev->socket; + pccard_mem_map *win; + u_long align; + int w; + + dev_dbg(&p_dev->dev, "request_window %pR %d\n", res, speed); + + 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); + + /* Configure the socket controller */ + win->map = w+1; + win->flags = res->flags & WIN_FLAGS_MAP; + win->speed = speed; + win->card_start = 0; + + if (s->ops->set_mem_map(s, win) != 0) { + dev_dbg(&p_dev->dev, "failed to set memory mapping\n"); + mutex_unlock(&s->ops_mutex); + return -EIO; + } + s->state |= SOCKET_WIN_REQ(w); + + /* Return window handle */ + if (s->features & SS_CAP_STATIC_MAP) + res->start = win->static_start; + else + res->start = win->res->start; + + /* convert to new-style resources */ + res->end += res->start - 1; + res->flags &= ~WIN_FLAGS_REQ; + res->flags |= (win->map << 2) | IORESOURCE_MEM; + res->parent = win->res; + if (win->res) + request_resource(&iomem_resource, res); + + dev_dbg(&p_dev->dev, "request_window results in %pR\n", res); + + mutex_unlock(&s->ops_mutex); + + return 0; +} /* pcmcia_request_window */ +EXPORT_SYMBOL(pcmcia_request_window); + + +/** + * 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); + } + + pcmcia_release_configuration(p_dev); + pcmcia_release_io(p_dev); + if (p_dev->_irq) { + free_irq(p_dev->irq, p_dev->priv); + p_dev->_irq = 0; + } +} +EXPORT_SYMBOL(pcmcia_disable_device); |