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Message-ID: <20141204213108.1351.2478.stgit@localhost.localdomain>
Date: Thu, 04 Dec 2014 21:31:22 +0000
From: Alan Cox <alan@...ux.intel.com>
To: linux-kernel@...r.kernel.org, linux-pcmica@...ts.infradead.org
Subject: [PATCH 5/5] 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 <alan@...ux.intel.com>
---
drivers/pcmcia/Kconfig | 12 ++-
drivers/pcmcia/Makefile | 1
drivers/pcmcia/rsrc_pci.c | 172 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 182 insertions(+), 3 deletions(-)
create mode 100644 drivers/pcmcia/rsrc_pci.c
diff --git a/drivers/pcmcia/Kconfig b/drivers/pcmcia/Kconfig
index b0ce7cd..2bd21a6 100644
--- a/drivers/pcmcia/Kconfig
+++ b/drivers/pcmcia/Kconfig
@@ -69,7 +69,8 @@ config YENTA
tristate "CardBus yenta-compatible bridge support"
depends on PCI
select CARDBUS if !EXPERT
- select PCCARD_NONSTATIC if PCMCIA != n
+ select PCCARD_NONSTATIC if PCMCIA != n && ISA
+ select PCCARD_PCI if PCMCIA !=n && !ISA
---help---
This option enables support for CardBus host bridges. Virtually
all modern PCMCIA bridges are CardBus compatible. A "bridge" is
@@ -109,7 +110,8 @@ config YENTA_TOSHIBA
config PD6729
tristate "Cirrus PD6729 compatible bridge support"
depends on PCMCIA && PCI
- select PCCARD_NONSTATIC
+ select PCCARD_NONSTATIC if PCMCIA != n && ISA
+ select PCCARD_PCI if PCMCIA !=n && !ISA
help
This provides support for the Cirrus PD6729 PCI-to-PCMCIA bridge
device, found in some older laptops and PCMCIA card readers.
@@ -117,7 +119,8 @@ config PD6729
config I82092
tristate "i82092 compatible bridge support"
depends on PCMCIA && PCI
- select PCCARD_NONSTATIC
+ select PCCARD_NONSTATIC if PCMCIA != n && ISA
+ select PCCARD_PCI if PCMCIA !=n && !ISA
help
This provides support for the Intel I82092AA PCI-to-PCMCIA bridge device,
found in some older laptops and more commonly in evaluation boards for the
@@ -289,6 +292,9 @@ config ELECTRA_CF
Say Y here to support the CompactFlash controller on the
PA Semi Electra eval board.
+config PCCARD_PCI
+ bool
+
config PCCARD_NONSTATIC
bool
diff --git a/drivers/pcmcia/Makefile b/drivers/pcmcia/Makefile
index 27e94b3..f1a7ca0 100644
--- a/drivers/pcmcia/Makefile
+++ b/drivers/pcmcia/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_PCMCIA) += pcmcia.o
pcmcia_rsrc-y += rsrc_mgr.o
pcmcia_rsrc-$(CONFIG_PCCARD_NONSTATIC) += rsrc_nonstatic.o
pcmcia_rsrc-$(CONFIG_PCCARD_IODYN) += rsrc_iodyn.o
+pcmcia_rsrc-$(CONFIG_PCCARD_PCI) += rsrc_pci.o
obj-$(CONFIG_PCCARD) += pcmcia_rsrc.o
diff --git a/drivers/pcmcia/rsrc_pci.c b/drivers/pcmcia/rsrc_pci.c
new file mode 100644
index 0000000..8934d3c
--- /dev/null
+++ b/drivers/pcmcia/rsrc_pci.c
@@ -0,0 +1,172 @@
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include <pcmcia/ss.h>
+#include <pcmcia/cistpl.h>
+#include "cs_internal.h"
+
+
+struct pcmcia_align_data {
+ unsigned long mask;
+ unsigned long offset;
+};
+
+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;
+
+ start = (res->start & ~data->mask) + data->offset;
+ if (start < res->start)
+ start += data->mask + 1;
+ return start;
+}
+
+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;
+
+ data.mask = align - 1;
+ data.offset = base & data.mask;
+
+ 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;
+}
+
+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;
+
+ /* 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 = 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 = 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 = 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 *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;
+
+ if (align < 0x20000)
+ align = 0x20000;
+ data.mask = align - 1;
+ data.offset = base & data.mask;
+
+ min = 0;
+ if (!low)
+ min = 0x100000UL;
+
+ ret = pci_bus_alloc_resource(s->cb_dev->bus,
+ res, num, 1, min, 0,
+ pcmcia_align, &data);
+
+ if (ret != 0) {
+ kfree(res);
+ res = NULL;
+ }
+ return res;
+}
+
+
+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;
+}
+
+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);
--
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