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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
957 lines
24 KiB
C
957 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PCMCIA 16-bit resource management functions
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*
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* The initial developer of the original code is David A. Hinds
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* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
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* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
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*
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* Copyright (C) 1999 David A. Hinds
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* Copyright (C) 2004-2010 Dominik Brodowski
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/device.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <asm/irq.h>
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#include <pcmcia/ss.h>
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#include <pcmcia/cistpl.h>
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#include <pcmcia/cisreg.h>
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#include <pcmcia/ds.h>
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#include "cs_internal.h"
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/* Access speed for IO windows */
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static int io_speed;
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module_param(io_speed, int, 0444);
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int pcmcia_validate_mem(struct pcmcia_socket *s)
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{
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if (s->resource_ops->validate_mem)
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return s->resource_ops->validate_mem(s);
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/* if there is no callback, we can assume that everything is OK */
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return 0;
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}
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struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
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int low, struct pcmcia_socket *s)
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{
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if (s->resource_ops->find_mem)
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return s->resource_ops->find_mem(base, num, align, low, s);
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return NULL;
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}
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/**
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* release_io_space() - release IO ports allocated with alloc_io_space()
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* @s: pcmcia socket
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* @res: resource to release
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*
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*/
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static void release_io_space(struct pcmcia_socket *s, struct resource *res)
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{
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resource_size_t num = resource_size(res);
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int i;
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dev_dbg(&s->dev, "release_io_space for %pR\n", res);
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for (i = 0; i < MAX_IO_WIN; i++) {
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if (!s->io[i].res)
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continue;
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if ((s->io[i].res->start <= res->start) &&
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(s->io[i].res->end >= res->end)) {
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s->io[i].InUse -= num;
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if (res->parent)
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release_resource(res);
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res->start = res->end = 0;
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res->flags = IORESOURCE_IO;
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/* Free the window if no one else is using it */
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if (s->io[i].InUse == 0) {
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release_resource(s->io[i].res);
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kfree(s->io[i].res);
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s->io[i].res = NULL;
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}
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}
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}
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}
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/**
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* alloc_io_space() - allocate IO ports for use by a PCMCIA device
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* @s: pcmcia socket
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* @res: resource to allocate (begin: begin, end: size)
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* @lines: number of IO lines decoded by the PCMCIA card
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*
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* Special stuff for managing IO windows, because they are scarce
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*/
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static int alloc_io_space(struct pcmcia_socket *s, struct resource *res,
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unsigned int lines)
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{
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unsigned int align;
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unsigned int base = res->start;
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unsigned int num = res->end;
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int ret;
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res->flags |= IORESOURCE_IO;
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dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n",
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res, lines);
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align = base ? (lines ? 1<<lines : 0) : 1;
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if (align && (align < num)) {
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if (base) {
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dev_dbg(&s->dev, "odd IO request\n");
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align = 0;
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} else
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while (align && (align < num))
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align <<= 1;
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}
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if (base & ~(align-1)) {
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dev_dbg(&s->dev, "odd IO request\n");
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align = 0;
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}
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ret = s->resource_ops->find_io(s, res->flags, &base, num, align,
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&res->parent);
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if (ret) {
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dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret);
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return -EINVAL;
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}
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res->start = base;
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res->end = res->start + num - 1;
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if (res->parent) {
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ret = request_resource(res->parent, res);
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if (ret) {
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dev_warn(&s->dev,
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"request_resource %pR failed: %d\n", res, ret);
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res->parent = NULL;
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release_io_space(s, res);
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}
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}
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dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res);
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return ret;
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}
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/**
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* pcmcia_access_config() - read or write card configuration registers
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*
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* pcmcia_access_config() reads and writes configuration registers in
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* attribute memory. Memory window 0 is reserved for this and the tuple
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* reading services. Drivers must use pcmcia_read_config_byte() or
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* pcmcia_write_config_byte().
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*/
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static int pcmcia_access_config(struct pcmcia_device *p_dev,
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off_t where, u8 *val,
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int (*accessf) (struct pcmcia_socket *s,
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int attr, unsigned int addr,
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unsigned int len, void *ptr))
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{
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struct pcmcia_socket *s;
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config_t *c;
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int addr;
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int ret = 0;
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s = p_dev->socket;
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mutex_lock(&s->ops_mutex);
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c = p_dev->function_config;
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if (!(c->state & CONFIG_LOCKED)) {
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dev_dbg(&p_dev->dev, "Configuration isn't locked\n");
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mutex_unlock(&s->ops_mutex);
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return -EACCES;
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}
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addr = (p_dev->config_base + where) >> 1;
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ret = accessf(s, 1, addr, 1, val);
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mutex_unlock(&s->ops_mutex);
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return ret;
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}
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/**
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* pcmcia_read_config_byte() - read a byte from a card configuration register
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*
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* pcmcia_read_config_byte() reads a byte from a configuration register in
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* attribute memory.
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*/
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int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val)
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{
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return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem);
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}
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EXPORT_SYMBOL(pcmcia_read_config_byte);
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/**
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* pcmcia_write_config_byte() - write a byte to a card configuration register
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*
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* pcmcia_write_config_byte() writes a byte to a configuration register in
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* attribute memory.
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*/
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int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
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{
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return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem);
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}
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EXPORT_SYMBOL(pcmcia_write_config_byte);
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/**
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* pcmcia_map_mem_page() - modify iomem window to point to a different offset
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* @p_dev: pcmcia device
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* @res: iomem resource already enabled by pcmcia_request_window()
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* @offset: card_offset to map
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*
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* pcmcia_map_mem_page() modifies what can be read and written by accessing
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* an iomem range previously enabled by pcmcia_request_window(), by setting
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* the card_offset value to @offset.
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*/
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int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res,
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unsigned int offset)
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{
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struct pcmcia_socket *s = p_dev->socket;
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unsigned int w;
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int ret;
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w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
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if (w >= MAX_WIN)
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return -EINVAL;
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mutex_lock(&s->ops_mutex);
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s->win[w].card_start = offset;
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ret = s->ops->set_mem_map(s, &s->win[w]);
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if (ret)
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dev_warn(&p_dev->dev, "failed to set_mem_map\n");
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mutex_unlock(&s->ops_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pcmcia_map_mem_page);
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/**
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* pcmcia_fixup_iowidth() - reduce io width to 8bit
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* @p_dev: pcmcia device
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*
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* pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the
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* IO width to 8bit after having called pcmcia_enable_device()
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* previously.
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*/
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int pcmcia_fixup_iowidth(struct pcmcia_device *p_dev)
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{
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struct pcmcia_socket *s = p_dev->socket;
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pccard_io_map io_off = { 0, 0, 0, 0, 1 };
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pccard_io_map io_on;
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int i, ret = 0;
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mutex_lock(&s->ops_mutex);
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dev_dbg(&p_dev->dev, "fixup iowidth to 8bit\n");
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if (!(s->state & SOCKET_PRESENT) ||
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!(p_dev->function_config->state & CONFIG_LOCKED)) {
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dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
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ret = -EACCES;
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goto unlock;
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}
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io_on.speed = io_speed;
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for (i = 0; i < MAX_IO_WIN; i++) {
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if (!s->io[i].res)
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continue;
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io_off.map = i;
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io_on.map = i;
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io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
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io_on.start = s->io[i].res->start;
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io_on.stop = s->io[i].res->end;
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s->ops->set_io_map(s, &io_off);
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msleep(40);
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s->ops->set_io_map(s, &io_on);
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}
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unlock:
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mutex_unlock(&s->ops_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pcmcia_fixup_iowidth);
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/**
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* pcmcia_fixup_vpp() - set Vpp to a new voltage level
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* @p_dev: pcmcia device
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* @new_vpp: new Vpp voltage
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*
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* pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to
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* a new voltage level between calls to pcmcia_enable_device()
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* and pcmcia_disable_device().
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*/
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int pcmcia_fixup_vpp(struct pcmcia_device *p_dev, unsigned char new_vpp)
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{
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struct pcmcia_socket *s = p_dev->socket;
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int ret = 0;
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mutex_lock(&s->ops_mutex);
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dev_dbg(&p_dev->dev, "fixup Vpp to %d\n", new_vpp);
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if (!(s->state & SOCKET_PRESENT) ||
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!(p_dev->function_config->state & CONFIG_LOCKED)) {
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dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
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ret = -EACCES;
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goto unlock;
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}
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s->socket.Vpp = new_vpp;
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if (s->ops->set_socket(s, &s->socket)) {
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dev_warn(&p_dev->dev, "Unable to set VPP\n");
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ret = -EIO;
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goto unlock;
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}
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p_dev->vpp = new_vpp;
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unlock:
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mutex_unlock(&s->ops_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pcmcia_fixup_vpp);
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/**
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* pcmcia_release_configuration() - physically disable a PCMCIA device
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* @p_dev: pcmcia device
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*
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* pcmcia_release_configuration() is the 1:1 counterpart to
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* pcmcia_enable_device(): If a PCMCIA device is no longer used by any
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* driver, the Vpp voltage is set to 0, IRQs will no longer be generated,
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* and I/O ranges will be disabled. As pcmcia_release_io() and
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* pcmcia_release_window() still need to be called, device drivers are
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* expected to call pcmcia_disable_device() instead.
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*/
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int pcmcia_release_configuration(struct pcmcia_device *p_dev)
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{
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pccard_io_map io = { 0, 0, 0, 0, 1 };
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struct pcmcia_socket *s = p_dev->socket;
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config_t *c;
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int i;
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mutex_lock(&s->ops_mutex);
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c = p_dev->function_config;
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if (p_dev->_locked) {
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p_dev->_locked = 0;
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if (--(s->lock_count) == 0) {
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s->socket.flags = SS_OUTPUT_ENA; /* Is this correct? */
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s->socket.Vpp = 0;
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s->socket.io_irq = 0;
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s->ops->set_socket(s, &s->socket);
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}
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}
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if (c->state & CONFIG_LOCKED) {
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c->state &= ~CONFIG_LOCKED;
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if (c->state & CONFIG_IO_REQ)
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for (i = 0; i < MAX_IO_WIN; i++) {
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if (!s->io[i].res)
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continue;
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s->io[i].Config--;
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if (s->io[i].Config != 0)
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continue;
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io.map = i;
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s->ops->set_io_map(s, &io);
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}
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}
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mutex_unlock(&s->ops_mutex);
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return 0;
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}
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/**
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* pcmcia_release_io() - release I/O allocated by a PCMCIA device
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* @p_dev: pcmcia device
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*
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* pcmcia_release_io() releases the I/O ranges allocated by a PCMCIA
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* device. This may be invoked some time after a card ejection has
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* already dumped the actual socket configuration, so if the client is
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* "stale", we don't bother checking the port ranges against the
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* current socket values.
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*/
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static int pcmcia_release_io(struct pcmcia_device *p_dev)
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{
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struct pcmcia_socket *s = p_dev->socket;
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int ret = -EINVAL;
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config_t *c;
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mutex_lock(&s->ops_mutex);
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if (!p_dev->_io)
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goto out;
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c = p_dev->function_config;
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release_io_space(s, &c->io[0]);
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if (c->io[1].end)
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release_io_space(s, &c->io[1]);
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p_dev->_io = 0;
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c->state &= ~CONFIG_IO_REQ;
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out:
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mutex_unlock(&s->ops_mutex);
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return ret;
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} /* pcmcia_release_io */
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/**
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* pcmcia_release_window() - release reserved iomem for PCMCIA devices
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* @p_dev: pcmcia device
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* @res: iomem resource to release
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*
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* pcmcia_release_window() releases &struct resource *res which was
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* previously reserved by calling pcmcia_request_window().
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*/
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int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)
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{
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struct pcmcia_socket *s = p_dev->socket;
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pccard_mem_map *win;
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unsigned int w;
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dev_dbg(&p_dev->dev, "releasing window %pR\n", res);
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w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
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if (w >= MAX_WIN)
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return -EINVAL;
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mutex_lock(&s->ops_mutex);
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win = &s->win[w];
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if (!(p_dev->_win & CLIENT_WIN_REQ(w))) {
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dev_dbg(&p_dev->dev, "not releasing unknown window\n");
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mutex_unlock(&s->ops_mutex);
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return -EINVAL;
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}
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/* Shut down memory window */
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win->flags &= ~MAP_ACTIVE;
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s->ops->set_mem_map(s, win);
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s->state &= ~SOCKET_WIN_REQ(w);
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/* Release system memory */
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if (win->res) {
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release_resource(res);
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release_resource(win->res);
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kfree(win->res);
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win->res = NULL;
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}
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res->start = res->end = 0;
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res->flags = IORESOURCE_MEM;
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p_dev->_win &= ~CLIENT_WIN_REQ(w);
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mutex_unlock(&s->ops_mutex);
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return 0;
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} /* pcmcia_release_window */
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EXPORT_SYMBOL(pcmcia_release_window);
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/**
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* pcmcia_enable_device() - set up and activate a PCMCIA device
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* @p_dev: the associated PCMCIA device
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*
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* pcmcia_enable_device() physically enables a PCMCIA device. It parses
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* the flags passed to in @flags and stored in @p_dev->flags and sets up
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* the Vpp voltage, enables the speaker line, I/O ports and store proper
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* values to configuration registers.
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*/
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int pcmcia_enable_device(struct pcmcia_device *p_dev)
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{
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int i;
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unsigned int base;
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struct pcmcia_socket *s = p_dev->socket;
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config_t *c;
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pccard_io_map iomap;
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unsigned char status = 0;
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unsigned char ext_status = 0;
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unsigned char option = 0;
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unsigned int flags = p_dev->config_flags;
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if (!(s->state & SOCKET_PRESENT))
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return -ENODEV;
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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);
|
|
|
|
/* 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);
|
|
msleep(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);
|
|
|
|
|
|
#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);
|