This patch adds functions to get a pointer to a sta2x11 instance data
structure given a pointer to a connext device or device node.
Such helpers will be used by the (now empty) common probe function,
and maybe by the common clock framework.
Signed-off-by: Davide Ciminaghi <cimina...@gnudd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asna...@st.com>
---
arch/x86/include/asm/sta2x11.h | 13 ++++++++
arch/x86/platform/sta2x11/sta2x11.c | 55 ++++++++++++++++++++++++++++++++++-
2 files changed, 67 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/sta2x11.h b/arch/x86/include/asm/sta2x11.h
index 30dd761..6df0c87 100644
--- a/arch/x86/include/asm/sta2x11.h
+++ b/arch/x86/include/asm/sta2x11.h
@@ -49,6 +49,19 @@ struct sta2x11_instance_data {
struct list_head list;
};
+/*
+ * Helper functions: get the pointer to a sta2x11 instance given the pointer
+ * to a device/device node belonging to a connext chip
+ */
+extern struct sta2x11_instance_data *
+sta2x11_node_to_instance(struct device_node *);
+
+static inline
+struct sta2x11_instance_data *sta2x11_dev_to_instance(struct device *dev)
+{
+ return sta2x11_node_to_instance(dev->of_node);
+}
+
#define STA2X11_SCTL_NAME "sta2x11-sctl"
#define STA2X11_GPIO_NAME "sta2x11-gpio"
#define STA2X11_SCR_NAME "sta2x11-scr"
diff --git a/arch/x86/platform/sta2x11/sta2x11.c
b/arch/x86/platform/sta2x11/sta2x11.c
index 936a7ab..861d447 100644
--- a/arch/x86/platform/sta2x11/sta2x11.c
+++ b/arch/x86/platform/sta2x11/sta2x11.c
@@ -189,7 +189,60 @@ sta2x11_platform_regmap_configs[sta2x11_n_plat_devs] = {
[sta2x11_scr] = &sta2x11_scr_regmap_config,
};
-/* Probe for the four platform devices */
+static struct sta2x11_instance_data *find_instance(int id)
+{
+ struct sta2x11_instance_data *ptr;
+ list_for_each_entry(ptr, &connext_instances, list)
+ if (ptr->id == id)
+ return ptr;
+ return NULL;
+}
+
+static struct sta2x11_instance_data
+*connext_node_to_instance(struct device_node *n)
+{
+ struct resource r;
+ if (of_pci_parse_bus_range(n, &r) < 0)
+ return NULL;
+ return find_instance(r.start + 1);
+}
+
+struct sta2x11_instance_data *sta2x11_node_to_instance(struct device_node *n)
+{
+ struct device_node *amba_bus, *pci_amba_bridge, *connext_node = NULL,
+ *parent;
+
+ if (!of_node_cmp(n->type, "pci")) {
+ /* A pci node */
+ for (parent = n->parent; parent; parent = parent->parent) {
+ if (of_device_is_compatible(parent, "pci104a,cc17")) {
+ connext_node = parent;
+ break;
+ }
+ }
+ if (!connext_node)
+ return NULL;
+ return connext_node_to_instance(connext_node);
+ }
+
+ /* An amba or platform device (or even an amba bus node) */
+ amba_bus = n;
+ if (!of_device_is_compatible(n, "arm,amba-bus"))
+ amba_bus = n->parent;
+ if (!amba_bus || !of_device_is_compatible(amba_bus, "arm,amba-bus"))
+ return NULL;
+ pci_amba_bridge = amba_bus->parent;
+ if (!pci_amba_bridge || !of_device_is_compatible(pci_amba_bridge,
+ "pci104a,cc18"))
+ return NULL;
+ connext_node = pci_amba_bridge->parent;
+ if (!connext_node ||
+ !of_device_is_compatible(connext_node, "pci104a,cc17.0"))
+ return NULL;
+ return connext_node_to_instance(connext_node);
+}
+EXPORT_SYMBOL(sta2x11_node_to_instance);
+
static int sta2x11_platform_probe(struct platform_device *dev,
enum sta2x11_plat_dev index)
--
1.7.7.2
--
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