diff options
Diffstat (limited to 'drivers/pcmcia/rsrc_nonstatic.c')
| -rw-r--r-- | drivers/pcmcia/rsrc_nonstatic.c | 1240 |
1 files changed, 1240 insertions, 0 deletions
diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c new file mode 100644 index 0000000000..bf9d070a44 --- /dev/null +++ b/drivers/pcmcia/rsrc_nonstatic.c @@ -0,0 +1,1240 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * rsrc_nonstatic.c -- Resource management routines for !SS_CAP_STATIC_MAP sockets + * + * 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. + * + * (C) 1999 David A. Hinds + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/timer.h> +#include <linux/pci.h> +#include <linux/device.h> +#include <linux/io.h> + +#include <asm/irq.h> + +#include <pcmcia/ss.h> +#include <pcmcia/cistpl.h> +#include "cs_internal.h" + +/* moved to rsrc_mgr.c +MODULE_AUTHOR("David A. Hinds, Dominik Brodowski"); +MODULE_LICENSE("GPL"); +*/ + +/* Parameters that can be set with 'insmod' */ + +#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444) + +INT_MODULE_PARM(probe_mem, 1); /* memory probe? */ +#ifdef CONFIG_PCMCIA_PROBE +INT_MODULE_PARM(probe_io, 1); /* IO port probe? */ +INT_MODULE_PARM(mem_limit, 0x10000); +#endif + +/* for io_db and mem_db */ +struct resource_map { + u_long base, num; + struct resource_map *next; +}; + +struct socket_data { + struct resource_map mem_db; + struct resource_map mem_db_valid; + struct resource_map io_db; +}; + +#define MEM_PROBE_LOW (1 << 0) +#define MEM_PROBE_HIGH (1 << 1) + +/* Action field */ +#define REMOVE_MANAGED_RESOURCE 1 +#define ADD_MANAGED_RESOURCE 2 + +/*====================================================================== + + Linux resource management extensions + +======================================================================*/ + +static struct resource * +claim_region(struct pcmcia_socket *s, resource_size_t base, + resource_size_t size, int type, char *name) +{ + struct resource *res, *parent; + + parent = type & IORESOURCE_MEM ? &iomem_resource : &ioport_resource; + res = pcmcia_make_resource(base, size, type | IORESOURCE_BUSY, name); + + if (res) { +#ifdef CONFIG_PCI + if (s && s->cb_dev) + parent = pci_find_parent_resource(s->cb_dev, res); +#endif + if (!parent || request_resource(parent, res)) { + kfree(res); + res = NULL; + } + } + return res; +} + +static void free_region(struct resource *res) +{ + if (res) { + release_resource(res); + kfree(res); + } +} + +/*====================================================================== + + These manage the internal databases of available resources. + +======================================================================*/ + +static int add_interval(struct resource_map *map, u_long base, u_long num) +{ + struct resource_map *p, *q; + + for (p = map; ; p = p->next) { + if ((p != map) && (p->base+p->num >= base)) { + p->num = max(num + base - p->base, p->num); + return 0; + } + if ((p->next == map) || (p->next->base > base+num-1)) + break; + } + q = kmalloc(sizeof(struct resource_map), GFP_KERNEL); + if (!q) { + printk(KERN_WARNING "out of memory to update resources\n"); + return -ENOMEM; + } + q->base = base; q->num = num; + q->next = p->next; p->next = q; + return 0; +} + +/*====================================================================*/ + +static int sub_interval(struct resource_map *map, u_long base, u_long num) +{ + struct resource_map *p, *q; + + for (p = map; ; p = q) { + q = p->next; + if (q == map) + break; + if ((q->base+q->num > base) && (base+num > q->base)) { + if (q->base >= base) { + if (q->base+q->num <= base+num) { + /* Delete whole block */ + p->next = q->next; + kfree(q); + /* don't advance the pointer yet */ + q = p; + } else { + /* Cut off bit from the front */ + q->num = q->base + q->num - base - num; + q->base = base + num; + } + } else if (q->base+q->num <= base+num) { + /* Cut off bit from the end */ + q->num = base - q->base; + } else { + /* Split the block into two pieces */ + p = kmalloc(sizeof(struct resource_map), + GFP_KERNEL); + if (!p) { + printk(KERN_WARNING "out of memory to update resources\n"); + return -ENOMEM; + } + p->base = base+num; + p->num = q->base+q->num - p->base; + q->num = base - q->base; + p->next = q->next ; q->next = p; + } + } + } + return 0; +} + +/*====================================================================== + + These routines examine a region of IO or memory addresses to + determine what ranges might be genuinely available. + +======================================================================*/ + +#ifdef CONFIG_PCMCIA_PROBE +static void do_io_probe(struct pcmcia_socket *s, unsigned int base, + unsigned int num) +{ + struct resource *res; + struct socket_data *s_data = s->resource_data; + unsigned int i, j, bad; + int any; + u_char *b, hole, most; + + dev_info(&s->dev, "cs: IO port probe %#x-%#x:", base, base+num-1); + + /* First, what does a floating port look like? */ + b = kzalloc(256, GFP_KERNEL); + if (!b) { + pr_cont("\n"); + dev_err(&s->dev, "do_io_probe: unable to kmalloc 256 bytes\n"); + return; + } + for (i = base, most = 0; i < base+num; i += 8) { + res = claim_region(s, i, 8, IORESOURCE_IO, "PCMCIA ioprobe"); + if (!res) + continue; + hole = inb(i); + for (j = 1; j < 8; j++) + if (inb(i+j) != hole) + break; + free_region(res); + if ((j == 8) && (++b[hole] > b[most])) + most = hole; + if (b[most] == 127) + break; + } + kfree(b); + + bad = any = 0; + for (i = base; i < base+num; i += 8) { + res = claim_region(s, i, 8, IORESOURCE_IO, "PCMCIA ioprobe"); + if (!res) { + if (!any) + pr_cont(" excluding"); + if (!bad) + bad = any = i; + continue; + } + for (j = 0; j < 8; j++) + if (inb(i+j) != most) + break; + free_region(res); + if (j < 8) { + if (!any) + pr_cont(" excluding"); + if (!bad) + bad = any = i; + } else { + if (bad) { + sub_interval(&s_data->io_db, bad, i-bad); + pr_cont(" %#x-%#x", bad, i-1); + bad = 0; + } + } + } + if (bad) { + if ((num > 16) && (bad == base) && (i == base+num)) { + sub_interval(&s_data->io_db, bad, i-bad); + pr_cont(" nothing: probe failed.\n"); + return; + } else { + sub_interval(&s_data->io_db, bad, i-bad); + pr_cont(" %#x-%#x", bad, i-1); + } + } + + pr_cont("%s\n", !any ? " clean" : ""); +} +#endif + +/*======================================================================*/ + +/* + * readable() - iomem validation function for cards with a valid CIS + */ +static int readable(struct pcmcia_socket *s, struct resource *res, + unsigned int *count) +{ + int ret = -EINVAL; + + if (s->fake_cis) { + dev_dbg(&s->dev, "fake CIS is being used: can't validate mem\n"); + return 0; + } + + s->cis_mem.res = res; + s->cis_virt = ioremap(res->start, s->map_size); + if (s->cis_virt) { + mutex_unlock(&s->ops_mutex); + /* as we're only called from pcmcia.c, we're safe */ + if (s->callback->validate) + ret = s->callback->validate(s, count); + /* invalidate mapping */ + mutex_lock(&s->ops_mutex); + iounmap(s->cis_virt); + s->cis_virt = NULL; + } + s->cis_mem.res = NULL; + if ((ret) || (*count == 0)) + return -EINVAL; + return 0; +} + +/* + * checksum() - iomem validation function for simple memory cards + */ +static int checksum(struct pcmcia_socket *s, struct resource *res, + unsigned int *value) +{ + pccard_mem_map map; + int i, a = 0, b = -1, d; + void __iomem *virt; + + virt = ioremap(res->start, s->map_size); + if (virt) { + map.map = 0; + map.flags = MAP_ACTIVE; + map.speed = 0; + map.res = res; + map.card_start = 0; + s->ops->set_mem_map(s, &map); + + /* Don't bother checking every word... */ + for (i = 0; i < s->map_size; i += 44) { + d = readl(virt+i); + a += d; + b &= d; + } + + map.flags = 0; + s->ops->set_mem_map(s, &map); + + iounmap(virt); + } + + if (b == -1) + return -EINVAL; + + *value = a; + + return 0; +} + +/** + * do_validate_mem() - low level validate a memory region for PCMCIA use + * @s: PCMCIA socket to validate + * @base: start address of resource to check + * @size: size of resource to check + * @validate: validation function to use + * + * do_validate_mem() splits up the memory region which is to be checked + * into two parts. Both are passed to the @validate() function. If + * @validate() returns non-zero, or the value parameter to @validate() + * is zero, or the value parameter is different between both calls, + * the check fails, and -EINVAL is returned. Else, 0 is returned. + */ +static int do_validate_mem(struct pcmcia_socket *s, + unsigned long base, unsigned long size, + int (*validate)(struct pcmcia_socket *s, + struct resource *res, + unsigned int *value)) +{ + struct socket_data *s_data = s->resource_data; + struct resource *res1, *res2; + unsigned int info1 = 1, info2 = 1; + int ret = -EINVAL; + + res1 = claim_region(s, base, size/2, IORESOURCE_MEM, "PCMCIA memprobe"); + res2 = claim_region(s, base + size/2, size/2, IORESOURCE_MEM, + "PCMCIA memprobe"); + + if (res1 && res2) { + ret = 0; + if (validate) { + ret = validate(s, res1, &info1); + ret += validate(s, res2, &info2); + } + } + + dev_dbg(&s->dev, "cs: memory probe 0x%06lx-0x%06lx: %pr %pr %u %u %u", + base, base+size-1, res1, res2, ret, info1, info2); + + free_region(res2); + free_region(res1); + + if ((ret) || (info1 != info2) || (info1 == 0)) + return -EINVAL; + + if (validate && !s->fake_cis) { + /* move it to the validated data set */ + add_interval(&s_data->mem_db_valid, base, size); + sub_interval(&s_data->mem_db, base, size); + } + + return 0; +} + + +/** + * do_mem_probe() - validate a memory region for PCMCIA use + * @s: PCMCIA socket to validate + * @base: start address of resource to check + * @num: size of resource to check + * @validate: validation function to use + * @fallback: validation function to use if validate fails + * + * do_mem_probe() checks a memory region for use by the PCMCIA subsystem. + * To do so, the area is split up into sensible parts, and then passed + * into the @validate() function. Only if @validate() and @fallback() fail, + * the area is marked as unavailable for use by the PCMCIA subsystem. The + * function returns the size of the usable memory area. + */ +static int do_mem_probe(struct pcmcia_socket *s, u_long base, u_long num, + int (*validate)(struct pcmcia_socket *s, + struct resource *res, + unsigned int *value), + int (*fallback)(struct pcmcia_socket *s, + struct resource *res, + unsigned int *value)) +{ + struct socket_data *s_data = s->resource_data; + u_long i, j, bad, fail, step; + + dev_info(&s->dev, "cs: memory probe 0x%06lx-0x%06lx:", + base, base+num-1); + bad = fail = 0; + step = (num < 0x20000) ? 0x2000 : ((num>>4) & ~0x1fff); + /* don't allow too large steps */ + if (step > 0x800000) + step = 0x800000; + /* cis_readable wants to map 2x map_size */ + if (step < 2 * s->map_size) + step = 2 * s->map_size; + for (i = j = base; i < base+num; i = j + step) { + if (!fail) { + for (j = i; j < base+num; j += step) { + if (!do_validate_mem(s, j, step, validate)) + break; + } + fail = ((i == base) && (j == base+num)); + } + if ((fail) && (fallback)) { + for (j = i; j < base+num; j += step) + if (!do_validate_mem(s, j, step, fallback)) + break; + } + if (i != j) { + if (!bad) + pr_cont(" excluding"); + pr_cont(" %#05lx-%#05lx", i, j-1); + sub_interval(&s_data->mem_db, i, j-i); + bad += j-i; + } + } + pr_cont("%s\n", !bad ? " clean" : ""); + return num - bad; +} + + +#ifdef CONFIG_PCMCIA_PROBE + +/** + * inv_probe() - top-to-bottom search for one usuable high memory area + * @s: PCMCIA socket to validate + * @m: resource_map to check + */ +static u_long inv_probe(struct resource_map *m, struct pcmcia_socket *s) +{ + struct socket_data *s_data = s->resource_data; + u_long ok; + if (m == &s_data->mem_db) + return 0; + ok = inv_probe(m->next, s); + if (ok) { + if (m->base >= 0x100000) + sub_interval(&s_data->mem_db, m->base, m->num); + return ok; + } + if (m->base < 0x100000) + return 0; + return do_mem_probe(s, m->base, m->num, readable, checksum); +} + +/** + * validate_mem() - memory probe function + * @s: PCMCIA socket to validate + * @probe_mask: MEM_PROBE_LOW | MEM_PROBE_HIGH + * + * The memory probe. If the memory list includes a 64K-aligned block + * below 1MB, we probe in 64K chunks, and as soon as we accumulate at + * least mem_limit free space, we quit. Returns 0 on usuable ports. + */ +static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask) +{ + struct resource_map *m, mm; + static unsigned char order[] = { 0xd0, 0xe0, 0xc0, 0xf0 }; + unsigned long b, i, ok = 0; + struct socket_data *s_data = s->resource_data; + + /* We do up to four passes through the list */ + if (probe_mask & MEM_PROBE_HIGH) { + if (inv_probe(s_data->mem_db.next, s) > 0) + return 0; + if (s_data->mem_db_valid.next != &s_data->mem_db_valid) + return 0; + dev_notice(&s->dev, + "cs: warning: no high memory space available!\n"); + return -ENODEV; + } + + for (m = s_data->mem_db.next; m != &s_data->mem_db; m = mm.next) { + mm = *m; + /* Only probe < 1 MB */ + if (mm.base >= 0x100000) + continue; + if ((mm.base | mm.num) & 0xffff) { + ok += do_mem_probe(s, mm.base, mm.num, readable, + checksum); + continue; + } + /* Special probe for 64K-aligned block */ + for (i = 0; i < 4; i++) { + b = order[i] << 12; + if ((b >= mm.base) && (b+0x10000 <= mm.base+mm.num)) { + if (ok >= mem_limit) + sub_interval(&s_data->mem_db, b, 0x10000); + else + ok += do_mem_probe(s, b, 0x10000, + readable, checksum); + } + } + } + + if (ok > 0) + return 0; + + return -ENODEV; +} + +#else /* CONFIG_PCMCIA_PROBE */ + +/** + * validate_mem() - memory probe function + * @s: PCMCIA socket to validate + * @probe_mask: ignored + * + * Returns 0 on usuable ports. + */ +static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask) +{ + struct resource_map *m, mm; + struct socket_data *s_data = s->resource_data; + unsigned long ok = 0; + + for (m = s_data->mem_db.next; m != &s_data->mem_db; m = mm.next) { + mm = *m; + ok += do_mem_probe(s, mm.base, mm.num, readable, checksum); + } + if (ok > 0) + return 0; + return -ENODEV; +} + +#endif /* CONFIG_PCMCIA_PROBE */ + + +/** + * pcmcia_nonstatic_validate_mem() - try to validate iomem for PCMCIA use + * @s: PCMCIA socket to validate + * + * This is tricky... when we set up CIS memory, we try to validate + * the memory window space allocations. + * + * Locking note: Must be called with skt_mutex held! + */ +static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s) +{ + struct socket_data *s_data = s->resource_data; + unsigned int probe_mask = MEM_PROBE_LOW; + int ret; + + if (!probe_mem || !(s->state & SOCKET_PRESENT)) + return 0; + + if (s->features & SS_CAP_PAGE_REGS) + probe_mask = MEM_PROBE_HIGH; + + ret = validate_mem(s, probe_mask); + + if (s_data->mem_db_valid.next != &s_data->mem_db_valid) + return 0; + + return ret; +} + +struct pcmcia_align_data { + unsigned long mask; + unsigned long offset; + struct resource_map *map; +}; + +static resource_size_t pcmcia_common_align(struct pcmcia_align_data *align_data, + resource_size_t start) +{ + resource_size_t ret; + /* + * Ensure that we have the correct start address + */ + ret = (start & ~align_data->mask) + align_data->offset; + if (ret < start) + ret += align_data->mask + 1; + return ret; +} + +static resource_size_t +pcmcia_align(void *align_data, const struct resource *res, + resource_size_t size, resource_size_t align) +{ + struct pcmcia_align_data *data = align_data; + struct resource_map *m; + resource_size_t start; + + start = pcmcia_common_align(data, res->start); + + for (m = data->map->next; m != data->map; m = m->next) { + unsigned long map_start = m->base; + unsigned long map_end = m->base + m->num - 1; + + /* + * If the lower resources are not available, try aligning + * to this entry of the resource database to see if it'll + * fit here. + */ + if (start < map_start) + start = pcmcia_common_align(data, map_start); + + /* + * If we're above the area which was passed in, there's + * no point proceeding. + */ + if (start >= res->end) + break; + + if ((start + size - 1) <= map_end) + break; + } + + /* + * If we failed to find something suitable, ensure we fail. + */ + if (m == data->map) + start = res->end; + + return start; +} + +/* + * Adjust an existing IO region allocation, but making sure that we don't + * encroach outside the resources which the user supplied. + */ +static int __nonstatic_adjust_io_region(struct pcmcia_socket *s, + unsigned long r_start, + unsigned long r_end) +{ + struct resource_map *m; + struct socket_data *s_data = s->resource_data; + int ret = -ENOMEM; + + for (m = s_data->io_db.next; m != &s_data->io_db; m = m->next) { + unsigned long start = m->base; + unsigned long end = m->base + m->num - 1; + + if (start > r_start || r_end > end) + continue; + + ret = 0; + } + + return ret; +} + +/*====================================================================== + + These find ranges of I/O ports or memory addresses that are not + currently allocated by other devices. + + The 'align' field should reflect the number of bits of address + that need to be preserved from the initial value of *base. It + should be a power of two, greater than or equal to 'num'. A value + of 0 means that all bits of *base are significant. *base should + also be strictly less than 'align'. + +======================================================================*/ + +static struct resource *__nonstatic_find_io_region(struct pcmcia_socket *s, + unsigned long base, int num, + unsigned long align) +{ + struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO, + dev_name(&s->dev)); + struct socket_data *s_data = s->resource_data; + struct pcmcia_align_data data; + unsigned long min = base; + int ret; + + if (!res) + return NULL; + + data.mask = align - 1; + data.offset = base & data.mask; + data.map = &s_data->io_db; + +#ifdef CONFIG_PCI + if (s->cb_dev) { + ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1, + min, 0, pcmcia_align, &data); + } else +#endif + ret = allocate_resource(&ioport_resource, res, num, min, ~0UL, + 1, pcmcia_align, &data); + + if (ret != 0) { + kfree(res); + res = NULL; + } + return res; +} + +static int nonstatic_find_io(struct pcmcia_socket *s, unsigned int attr, + unsigned int *base, unsigned int num, + unsigned int align, struct resource **parent) +{ + int i, ret = 0; + + /* Check for an already-allocated window that must conflict with + * what was asked for. It is a hack because it does not catch all + * potential conflicts, just the most obvious ones. + */ + for (i = 0; i < MAX_IO_WIN; i++) { + if (!s->io[i].res) + continue; + + if (!*base) + continue; + + if ((s->io[i].res->start & (align-1)) == *base) + return -EBUSY; + } + + for (i = 0; i < MAX_IO_WIN; i++) { + struct resource *res = s->io[i].res; + unsigned int try; + + if (res && (res->flags & IORESOURCE_BITS) != + (attr & IORESOURCE_BITS)) + continue; + + if (!res) { + if (align == 0) + align = 0x10000; + + res = s->io[i].res = __nonstatic_find_io_region(s, + *base, num, + align); + if (!res) + return -EINVAL; + + *base = res->start; + s->io[i].res->flags = + ((res->flags & ~IORESOURCE_BITS) | + (attr & IORESOURCE_BITS)); + s->io[i].InUse = num; + *parent = res; + return 0; + } + + /* Try to extend top of window */ + try = res->end + 1; + if ((*base == 0) || (*base == try)) { + ret = __nonstatic_adjust_io_region(s, res->start, + res->end + num); + if (!ret) { + ret = adjust_resource(s->io[i].res, res->start, + resource_size(res) + num); + if (ret) + continue; + *base = try; + s->io[i].InUse += num; + *parent = res; + return 0; + } + } + + /* Try to extend bottom of window */ + try = res->start - num; + if ((*base == 0) || (*base == try)) { + ret = __nonstatic_adjust_io_region(s, + res->start - num, + res->end); + if (!ret) { + ret = adjust_resource(s->io[i].res, + res->start - num, + resource_size(res) + num); + if (ret) + continue; + *base = try; + s->io[i].InUse += num; + *parent = res; + return 0; + } + } + } + + return -EINVAL; +} + + +static struct resource *nonstatic_find_mem_region(u_long base, u_long num, + u_long align, int low, struct pcmcia_socket *s) +{ + struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_MEM, + dev_name(&s->dev)); + struct socket_data *s_data = s->resource_data; + struct pcmcia_align_data data; + unsigned long min, max; + int ret, i, j; + + if (!res) + return NULL; + + low = low || !(s->features & SS_CAP_PAGE_REGS); + + data.mask = align - 1; + data.offset = base & data.mask; + + for (i = 0; i < 2; i++) { + data.map = &s_data->mem_db_valid; + if (low) { + max = 0x100000UL; + min = base < max ? base : 0; + } else { + max = ~0UL; + min = 0x100000UL + base; + } + + for (j = 0; j < 2; j++) { +#ifdef CONFIG_PCI + if (s->cb_dev) { + ret = pci_bus_alloc_resource(s->cb_dev->bus, + res, num, 1, min, 0, + pcmcia_align, &data); + } else +#endif + { + ret = allocate_resource(&iomem_resource, + res, num, min, max, 1, + pcmcia_align, &data); + } + if (ret == 0) + break; + data.map = &s_data->mem_db; + } + if (ret == 0 || low) + break; + low = 1; + } + + if (ret != 0) { + kfree(res); + res = NULL; + } + return res; +} + + +static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned long start, unsigned long end) +{ + struct socket_data *data = s->resource_data; + unsigned long size = end - start + 1; + int ret = 0; + + if (end < start) + return -EINVAL; + + switch (action) { + case ADD_MANAGED_RESOURCE: + ret = add_interval(&data->mem_db, start, size); + if (!ret) + do_mem_probe(s, start, size, NULL, NULL); + break; + case REMOVE_MANAGED_RESOURCE: + ret = sub_interval(&data->mem_db, start, size); + break; + default: + ret = -EINVAL; + } + + return ret; +} + + +static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long start, unsigned long end) +{ + struct socket_data *data = s->resource_data; + unsigned long size; + int ret = 0; + +#if defined(CONFIG_X86) + /* on x86, avoid anything < 0x100 for it is often used for + * legacy platform devices */ + if (start < 0x100) + start = 0x100; +#endif + + size = end - start + 1; + + if (end < start) + return -EINVAL; + + if (end > IO_SPACE_LIMIT) + return -EINVAL; + + switch (action) { + case ADD_MANAGED_RESOURCE: + if (add_interval(&data->io_db, start, size) != 0) { + ret = -EBUSY; + break; + } +#ifdef CONFIG_PCMCIA_PROBE + if (probe_io) + do_io_probe(s, start, size); +#endif + break; + case REMOVE_MANAGED_RESOURCE: + sub_interval(&data->io_db, start, size); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + + +#ifdef CONFIG_PCI +static int nonstatic_autoadd_resources(struct pcmcia_socket *s) +{ + struct resource *res; + int i, done = 0; + + if (!s->cb_dev || !s->cb_dev->bus) + return -ENODEV; + +#if defined(CONFIG_X86) + /* If this is the root bus, the risk of hitting some strange + * system devices is too high: If a driver isn't loaded, the + * resources are not claimed; even if a driver is loaded, it + * may not request all resources or even the wrong one. We + * can neither trust the rest of the kernel nor ACPI/PNP and + * CRS parsing to get it right. Therefore, use several + * safeguards: + * + * - Do not auto-add resources if the CardBus bridge is on + * the PCI root bus + * + * - Avoid any I/O ports < 0x100. + * + * - On PCI-PCI bridges, only use resources which are set up + * exclusively for the secondary PCI bus: the risk of hitting + * system devices is quite low, as they usually aren't + * connected to the secondary PCI bus. + */ + if (s->cb_dev->bus->number == 0) + return -EINVAL; + + for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { + res = s->cb_dev->bus->resource[i]; +#else + pci_bus_for_each_resource(s->cb_dev->bus, res, i) { +#endif + if (!res) + continue; + + if (res->flags & IORESOURCE_IO) { + /* safeguard against the root resource, where the + * risk of hitting any other device would be too + * high */ + if (res == &ioport_resource) + continue; + + dev_info(&s->cb_dev->dev, + "pcmcia: parent PCI bridge window: %pR\n", + res); + if (!adjust_io(s, ADD_MANAGED_RESOURCE, res->start, res->end)) + done |= IORESOURCE_IO; + + } + + if (res->flags & IORESOURCE_MEM) { + /* safeguard against the root resource, where the + * risk of hitting any other device would be too + * high */ + if (res == &iomem_resource) + continue; + + dev_info(&s->cb_dev->dev, + "pcmcia: parent PCI bridge window: %pR\n", + res); + if (!adjust_memory(s, ADD_MANAGED_RESOURCE, res->start, res->end)) + done |= IORESOURCE_MEM; + } + } + + /* if we got at least one of IO, and one of MEM, we can be glad and + * activate the PCMCIA subsystem */ + if (done == (IORESOURCE_MEM | IORESOURCE_IO)) + s->resource_setup_done = 1; + + return 0; +} + +#else + +static inline int nonstatic_autoadd_resources(struct pcmcia_socket *s) +{ + return -ENODEV; +} + +#endif + + +static int nonstatic_init(struct pcmcia_socket *s) +{ + struct socket_data *data; + + data = kzalloc(sizeof(struct socket_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->mem_db.next = &data->mem_db; + data->mem_db_valid.next = &data->mem_db_valid; + data->io_db.next = &data->io_db; + + s->resource_data = (void *) data; + + nonstatic_autoadd_resources(s); + + return 0; +} + +static void nonstatic_release_resource_db(struct pcmcia_socket *s) +{ + struct socket_data *data = s->resource_data; + struct resource_map *p, *q; + + for (p = data->mem_db_valid.next; p != &data->mem_db_valid; p = q) { + q = p->next; + kfree(p); + } + for (p = data->mem_db.next; p != &data->mem_db; p = q) { + q = p->next; + kfree(p); + } + for (p = data->io_db.next; p != &data->io_db; p = q) { + q = p->next; + kfree(p); + } + + kfree(data); +} + + +struct pccard_resource_ops pccard_nonstatic_ops = { + .validate_mem = pcmcia_nonstatic_validate_mem, + .find_io = nonstatic_find_io, + .find_mem = nonstatic_find_mem_region, + .init = nonstatic_init, + .exit = nonstatic_release_resource_db, +}; +EXPORT_SYMBOL(pccard_nonstatic_ops); + + +/* sysfs interface to the resource database */ + +static ssize_t show_io_db(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pcmcia_socket *s = dev_get_drvdata(dev); + struct socket_data *data; + struct resource_map *p; + ssize_t ret = 0; + + mutex_lock(&s->ops_mutex); + data = s->resource_data; + + for (p = data->io_db.next; p != &data->io_db; p = p->next) { + if (ret > (PAGE_SIZE - 10)) + continue; + ret += sysfs_emit_at(buf, ret, + "0x%08lx - 0x%08lx\n", + ((unsigned long) p->base), + ((unsigned long) p->base + p->num - 1)); + } + + mutex_unlock(&s->ops_mutex); + return ret; +} + +static ssize_t store_io_db(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pcmcia_socket *s = dev_get_drvdata(dev); + unsigned long start_addr, end_addr; + unsigned int add = ADD_MANAGED_RESOURCE; + ssize_t ret = 0; + + ret = sscanf(buf, "+ 0x%lx - 0x%lx", &start_addr, &end_addr); + if (ret != 2) { + ret = sscanf(buf, "- 0x%lx - 0x%lx", &start_addr, &end_addr); + add = REMOVE_MANAGED_RESOURCE; + if (ret != 2) { + ret = sscanf(buf, "0x%lx - 0x%lx", &start_addr, + &end_addr); + add = ADD_MANAGED_RESOURCE; + if (ret != 2) + return -EINVAL; + } + } + if (end_addr < start_addr) + return -EINVAL; + + mutex_lock(&s->ops_mutex); + ret = adjust_io(s, add, start_addr, end_addr); + mutex_unlock(&s->ops_mutex); + + return ret ? ret : count; +} +static DEVICE_ATTR(available_resources_io, 0600, show_io_db, store_io_db); + +static ssize_t show_mem_db(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pcmcia_socket *s = dev_get_drvdata(dev); + struct socket_data *data; + struct resource_map *p; + ssize_t ret = 0; + + mutex_lock(&s->ops_mutex); + data = s->resource_data; + + for (p = data->mem_db_valid.next; p != &data->mem_db_valid; + p = p->next) { + if (ret > (PAGE_SIZE - 10)) + continue; + ret += sysfs_emit_at(buf, ret, + "0x%08lx - 0x%08lx\n", + ((unsigned long) p->base), + ((unsigned long) p->base + p->num - 1)); + } + + for (p = data->mem_db.next; p != &data->mem_db; p = p->next) { + if (ret > (PAGE_SIZE - 10)) + continue; + ret += sysfs_emit_at(buf, ret, + "0x%08lx - 0x%08lx\n", + ((unsigned long) p->base), + ((unsigned long) p->base + p->num - 1)); + } + + mutex_unlock(&s->ops_mutex); + return ret; +} + +static ssize_t store_mem_db(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pcmcia_socket *s = dev_get_drvdata(dev); + unsigned long start_addr, end_addr; + unsigned int add = ADD_MANAGED_RESOURCE; + ssize_t ret = 0; + + ret = sscanf(buf, "+ 0x%lx - 0x%lx", &start_addr, &end_addr); + if (ret != 2) { + ret = sscanf(buf, "- 0x%lx - 0x%lx", &start_addr, &end_addr); + add = REMOVE_MANAGED_RESOURCE; + if (ret != 2) { + ret = sscanf(buf, "0x%lx - 0x%lx", &start_addr, + &end_addr); + add = ADD_MANAGED_RESOURCE; + if (ret != 2) + return -EINVAL; + } + } + if (end_addr < start_addr) + return -EINVAL; + + mutex_lock(&s->ops_mutex); + ret = adjust_memory(s, add, start_addr, end_addr); + mutex_unlock(&s->ops_mutex); + + return ret ? ret : count; +} +static DEVICE_ATTR(available_resources_mem, 0600, show_mem_db, store_mem_db); + +static struct attribute *pccard_rsrc_attributes[] = { + &dev_attr_available_resources_io.attr, + &dev_attr_available_resources_mem.attr, + NULL, +}; + +static const struct attribute_group rsrc_attributes = { + .attrs = pccard_rsrc_attributes, +}; + +static int pccard_sysfs_add_rsrc(struct device *dev) +{ + struct pcmcia_socket *s = dev_get_drvdata(dev); + + if (s->resource_ops != &pccard_nonstatic_ops) + return 0; + return sysfs_create_group(&dev->kobj, &rsrc_attributes); +} + +static void pccard_sysfs_remove_rsrc(struct device *dev) +{ + struct pcmcia_socket *s = dev_get_drvdata(dev); + + if (s->resource_ops != &pccard_nonstatic_ops) + return; + sysfs_remove_group(&dev->kobj, &rsrc_attributes); +} + +static struct class_interface pccard_rsrc_interface __refdata = { + .class = &pcmcia_socket_class, + .add_dev = &pccard_sysfs_add_rsrc, + .remove_dev = &pccard_sysfs_remove_rsrc, +}; + +static int __init nonstatic_sysfs_init(void) +{ + return class_interface_register(&pccard_rsrc_interface); +} + +static void __exit nonstatic_sysfs_exit(void) +{ + class_interface_unregister(&pccard_rsrc_interface); +} + +module_init(nonstatic_sysfs_init); +module_exit(nonstatic_sysfs_exit); |