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pcmcia: add a new resource manager for non ISA systems
On a pure PCI platform we don't actually need all the complexity of the rsrc_nonstatic manager, in fact we can just work directly with the pci allocators and avoid all the complexity (and code bloat). Signed-off-by: Alan Cox <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| #include <linux/slab.h> | ||
| #include <linux/module.h> | ||
| #include <linux/kernel.h> | ||
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| #include <pcmcia/ss.h> | ||
| #include <pcmcia/cistpl.h> | ||
| #include "cs_internal.h" | ||
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| struct pcmcia_align_data { | ||
| unsigned long mask; | ||
| unsigned long offset; | ||
| }; | ||
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| 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; | ||
| resource_size_t start; | ||
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| start = (res->start & ~data->mask) + data->offset; | ||
| if (start < res->start) | ||
| start += data->mask + 1; | ||
| return start; | ||
| } | ||
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| static struct resource *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 pcmcia_align_data data; | ||
| int ret; | ||
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| data.mask = align - 1; | ||
| data.offset = base & data.mask; | ||
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| ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1, | ||
| base, 0, pcmcia_align, &data); | ||
| if (ret != 0) { | ||
| kfree(res); | ||
| res = NULL; | ||
| } | ||
| return res; | ||
| } | ||
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| static int res_pci_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; | ||
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| /* 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; | ||
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| if (!*base) | ||
| continue; | ||
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| if ((s->io[i].res->start & (align-1)) == *base) | ||
| return -EBUSY; | ||
| } | ||
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| for (i = 0; i < MAX_IO_WIN; i++) { | ||
| struct resource *res = s->io[i].res; | ||
| unsigned int try; | ||
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| if (res && (res->flags & IORESOURCE_BITS) != | ||
| (attr & IORESOURCE_BITS)) | ||
| continue; | ||
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| if (!res) { | ||
| if (align == 0) | ||
| align = 0x10000; | ||
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| res = s->io[i].res = find_io_region(s, *base, num, | ||
| align); | ||
| if (!res) | ||
| return -EINVAL; | ||
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| *base = res->start; | ||
| s->io[i].res->flags = | ||
| ((res->flags & ~IORESOURCE_BITS) | | ||
| (attr & IORESOURCE_BITS)); | ||
| s->io[i].InUse = num; | ||
| *parent = res; | ||
| return 0; | ||
| } | ||
|
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| /* Try to extend top of window */ | ||
| try = res->end + 1; | ||
| if ((*base == 0) || (*base == try)) { | ||
| 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; | ||
| } | ||
|
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| /* Try to extend bottom of window */ | ||
| try = res->start - num; | ||
| if ((*base == 0) || (*base == try)) { | ||
| 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; | ||
| } | ||
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| static struct resource *res_pci_find_mem(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 pcmcia_align_data data; | ||
| unsigned long min; | ||
| int ret; | ||
|
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| if (align < 0x20000) | ||
| align = 0x20000; | ||
| data.mask = align - 1; | ||
| data.offset = base & data.mask; | ||
|
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| min = 0; | ||
| if (!low) | ||
| min = 0x100000UL; | ||
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| ret = pci_bus_alloc_resource(s->cb_dev->bus, | ||
| res, num, 1, min, 0, | ||
| pcmcia_align, &data); | ||
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| if (ret != 0) { | ||
| kfree(res); | ||
| res = NULL; | ||
| } | ||
| return res; | ||
| } | ||
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| static int res_pci_init(struct pcmcia_socket *s) | ||
| { | ||
| if (!s->cb_dev || (!s->features & SS_CAP_PAGE_REGS)) { | ||
| dev_err(&s->dev, "not supported by res_pci\n"); | ||
| return -EOPNOTSUPP; | ||
| } | ||
| return 0; | ||
| } | ||
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| struct pccard_resource_ops pccard_nonstatic_ops = { | ||
| .validate_mem = NULL, | ||
| .find_io = res_pci_find_io, | ||
| .find_mem = res_pci_find_mem, | ||
| .init = res_pci_init, | ||
| .exit = NULL, | ||
| }; | ||
| EXPORT_SYMBOL(pccard_nonstatic_ops); |