From: Thierry Reding <thierry.reding@avionic-design.de>
To: linux-tegra@vger.kernel.org
Cc: Bjorn Helgaas <bhelgaas@google.com>,
linux-pci@vger.kernel.org,
Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <rob.herring@calxeda.com>,
devicetree-discuss@lists.ozlabs.org,
Russell King <linux@arm.linux.org.uk>,
linux-arm-kernel@lists.infradead.org,
Colin Cross <ccross@android.com>, Olof Johansson <olof@lixom.net>,
Stephen Warren <swarren@wwwdotorg.org>,
Mitch Bradley <wmb@firmworks.com>, Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH v3 09/10] of: Add of_pci_parse_ranges()
Date: Thu, 26 Jul 2012 21:55:11 +0200 [thread overview]
Message-ID: <1343332512-28762-10-git-send-email-thierry.reding@avionic-design.de> (raw)
In-Reply-To: <1343332512-28762-1-git-send-email-thierry.reding@avionic-design.de>
This new function parses the ranges property of PCI device nodes into
an array of struct resource elements. It is useful in multiple-port PCI
host controller drivers to collect information about the ranges that it
needs to forward to the respective ports.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
---
Changes in v3:
- new patch
drivers/of/of_pci.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++-
include/linux/of_pci.h | 2 ++
2 files changed, 85 insertions(+), 1 deletion(-)
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 13e37e2..bcff301 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -1,7 +1,8 @@
#include <linux/kernel.h>
#include <linux/export.h>
-#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/of_pci.h>
+#include <linux/slab.h>
#include <asm/prom.h>
static inline int __of_pci_pci_compare(struct device_node *node,
@@ -40,3 +41,84 @@ struct device_node *of_pci_find_child_device(struct device_node *parent,
return NULL;
}
EXPORT_SYMBOL_GPL(of_pci_find_child_device);
+
+struct resource *of_pci_parse_ranges(struct device_node *node,
+ unsigned int *countp)
+{
+ unsigned int count, i = 0;
+ struct resource *ranges;
+ const __be32 *values;
+ int len, pna, np;
+
+ values = of_get_property(node, "ranges", &len);
+ if (!values)
+ return NULL;
+
+ pna = of_n_addr_cells(node);
+ np = pna + 5;
+
+ count = len / (np * sizeof(*values));
+
+ ranges = kzalloc(sizeof(*ranges) * count, GFP_KERNEL);
+ if (!ranges)
+ return NULL;
+
+ pr_debug("PCI ranges:\n");
+
+ while ((len -= np * sizeof(*values)) >= 0) {
+ u64 addr = of_translate_address(node, values + 3);
+ u64 size = of_read_number(values + 3 + pna, 2);
+ u32 type = be32_to_cpup(values);
+ const char *suffix = "";
+ struct resource range;
+
+ memset(&range, 0, sizeof(range));
+ range.start = addr;
+ range.end = addr + size - 1;
+
+ switch ((type >> 24) & 0x3) {
+ case 0:
+ range.flags = IORESOURCE_MEM | IORESOURCE_PCI_CS;
+ pr_debug(" CS %#x-%#x\n", range.start, range.end);
+ break;
+
+ case 1:
+ range.flags = IORESOURCE_IO;
+ pr_debug(" IO %#x-%#x\n", range.start, range.end);
+ break;
+
+ case 2:
+ range.flags = IORESOURCE_MEM;
+
+ if (type & 0x40000000) {
+ range.flags |= IORESOURCE_PREFETCH;
+ suffix = "prefetch";
+ }
+
+ pr_debug(" MEM %#x-%#x %s\n", range.start, range.end,
+ suffix);
+ break;
+
+ case 3:
+ range.flags = IORESOURCE_MEM | IORESOURCE_MEM_64;
+
+ if (type & 0x40000000) {
+ range.flags |= IORESOURCE_PREFETCH;
+ suffix = "prefetch";
+ }
+
+ pr_debug(" MEM %#x-%#x 64-bit %s\n", range.start,
+ range.end, suffix);
+ break;
+ }
+
+ memcpy(&ranges[i++], &range, sizeof(range));
+ values += np;
+ }
+
+ if (countp)
+ *countp = count;
+
+ return ranges;
+}
+EXPORT_SYMBOL_GPL(of_pci_parse_ranges);
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index bb115de..c0db6ea 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -10,5 +10,7 @@ int of_irq_map_pci(const struct pci_dev *pdev, struct of_irq *out_irq);
struct device_node;
struct device_node *of_pci_find_child_device(struct device_node *parent,
unsigned int devfn);
+struct resource *of_pci_parse_ranges(struct device_node *node,
+ unsigned int *countp);
#endif
--
1.7.11.2
next prev parent reply other threads:[~2012-07-26 19:55 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-26 19:55 [PATCH v3 00/10] ARM: tegra: Add PCIe device tree support Thierry Reding
2012-07-26 19:55 ` [PATCH v3 01/10] PCI: Keep pci_fixup_irqs() around after init Thierry Reding
2012-08-14 5:06 ` Bjorn Helgaas
2012-08-14 5:37 ` Thierry Reding
2012-08-15 17:06 ` Bjorn Helgaas
2012-08-15 19:28 ` Thierry Reding
2012-08-15 19:42 ` Bjorn Helgaas
2012-08-15 20:01 ` Thierry Reding
2012-09-07 16:19 ` Stephen Warren
2012-09-07 17:00 ` Thierry Reding
2012-09-07 17:22 ` Bjorn Helgaas
2012-09-14 18:55 ` Thierry Reding
2012-09-14 19:45 ` Bjorn Helgaas
2012-07-26 19:55 ` [PATCH v3 02/10] ARM: pci: Keep pci_common_init() " Thierry Reding
2012-07-26 19:55 ` [PATCH v3 03/10] ARM: pci: Allow passing per-controller private data Thierry Reding
2012-07-26 19:55 ` [PATCH v3 04/10] ARM: tegra: Move tegra_pcie_xclk_clamp() to PMC Thierry Reding
2012-07-26 19:55 ` [PATCH v3 05/10] resource: add PCI configuration space support Thierry Reding
2012-08-14 5:00 ` Bjorn Helgaas
2012-08-14 5:55 ` Thierry Reding
2012-08-14 17:38 ` Bjorn Helgaas
2012-08-14 18:01 ` Thierry Reding
2012-08-14 21:44 ` Bjorn Helgaas
2012-08-15 6:49 ` Thierry Reding
2012-08-16 15:18 ` Stephen Warren
2012-08-16 18:27 ` Thierry Reding
2012-07-26 19:55 ` [PATCH v3 06/10] ARM: tegra: Rewrite PCIe support as a driver Thierry Reding
2012-07-26 19:55 ` [PATCH v3 07/10] ARM: tegra: pcie: Add MSI support Thierry Reding
2012-07-26 19:55 ` [PATCH v3 08/10] of/address: Handle #address-cells > 2 specially Thierry Reding
2012-07-31 20:18 ` Rob Herring
2012-08-15 20:06 ` Thierry Reding
2012-09-07 16:24 ` Stephen Warren
2012-09-07 16:32 ` Rob Herring
2012-07-26 19:55 ` Thierry Reding [this message]
2012-07-31 20:07 ` [PATCH v3 09/10] of: Add of_pci_parse_ranges() Rob Herring
2012-08-01 6:54 ` Thierry Reding
2012-08-01 16:07 ` Stephen Warren
2012-07-26 19:55 ` [PATCH v3 10/10] ARM: tegra: pcie: Add device tree support Thierry Reding
2012-08-14 20:12 ` Thierry Reding
2012-08-14 23:50 ` Bjorn Helgaas
2012-08-15 6:37 ` Thierry Reding
2012-08-15 12:18 ` Bjorn Helgaas
2012-08-15 12:30 ` Thierry Reding
2012-08-15 14:36 ` Bjorn Helgaas
2012-08-15 14:57 ` Thierry Reding
2012-08-15 20:25 ` Arnd Bergmann
2012-08-15 20:48 ` Bjorn Helgaas
2012-08-16 4:55 ` Thierry Reding
2012-08-16 7:03 ` Arnd Bergmann
2012-08-16 7:47 ` Thierry Reding
2012-08-16 12:15 ` Thierry Reding
2012-07-31 16:18 ` [PATCH v3 00/10] ARM: tegra: Add PCIe " Stephen Warren
2012-08-01 6:35 ` Thierry Reding
2012-08-01 17:02 ` Stephen Warren
2012-08-02 6:15 ` Thierry Reding
2012-08-06 19:42 ` Stephen Warren
2012-08-07 18:20 ` Thierry Reding
2012-08-13 17:40 ` Thierry Reding
2012-08-13 18:47 ` Stephen Warren
2012-08-13 20:33 ` Thierry Reding
2012-08-13 21:38 ` Rob Herring
2012-08-14 6:14 ` Thierry Reding
2012-08-13 23:18 ` Bjorn Helgaas
2012-08-14 6:29 ` Thierry Reding
2012-08-14 19:39 ` Stephen Warren
2012-08-14 19:58 ` Thierry Reding
2012-08-14 21:55 ` Bjorn Helgaas
2012-08-14 22:58 ` Stephen Warren
2012-08-14 23:51 ` Stephen Warren
2012-08-15 19:04 ` Stephen Warren
2012-08-15 20:09 ` Thierry Reding
2012-08-15 20:11 ` Stephen Warren
2012-08-15 20:19 ` Thierry Reding
2012-09-07 23:34 ` Stephen Warren
2012-09-08 0:04 ` Russell King - ARM Linux
2012-09-08 5:53 ` Stephen Warren
2012-09-08 17:51 ` Bjorn Helgaas
2012-09-18 6:33 ` Thierry Reding
2012-09-18 15:56 ` Bjorn Helgaas
2012-08-15 0:08 ` Bjorn Helgaas
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