ARM: integrator: hook the CP into the SoC bus

This hooks the Integrator/CP into the SoC bus when booting from
device tree, by mapping the CP controller registers first,
then registering the SoC device, and then populating the device
tree with the SoC device as parent.

Cc: Lee Jones <lee.jones@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 55 insertions, 2 deletions

diff --git a/arch/arm/mach-integrator/integrator_cp.c b/arch/arm/mach-integrator/integrator_cp.c
index 5b08e8e4cc83..9194a4f3339c 100644
--- a/arch/arm/mach-integrator/integrator_cp.c
+++ b/arch/arm/mach-integrator/integrator_cp.c
@@ -26,6 +26,7 @@
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
+#include <linux/sys_soc.h>
 
 #include <mach/hardware.h>
 #include <mach/platform.h>
@@ -336,10 +337,62 @@ static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
 	{ /* sentinel */ },
 };
 
+/* Base address to the CP controller */
+static void __iomem *intcp_con_base;
+
 static void __init intcp_init_of(void)
 {
-	of_platform_populate(NULL, of_default_bus_match_table,
-			intcp_auxdata_lookup, NULL);
+	struct device_node *root;
+	struct device_node *cpcon;
+	struct device *parent;
+	struct soc_device *soc_dev;
+	struct soc_device_attribute *soc_dev_attr;
+	u32 intcp_sc_id;
+	int err;
+
+	/* Here we create an SoC device for the root node */
+	root = of_find_node_by_path("/");
+	if (!root)
+		return;
+	cpcon = of_find_node_by_path("/cpcon");
+	if (!cpcon)
+		return;
+
+	intcp_con_base = of_iomap(cpcon, 0);
+	if (!intcp_con_base)
+		return;
+
+	intcp_sc_id = readl(intcp_con_base);
+
+	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+	if (!soc_dev_attr)
+		return;
+
+	err = of_property_read_string(root, "compatible",
+				      &soc_dev_attr->soc_id);
+	if (err)
+		return;
+	err = of_property_read_string(root, "model", &soc_dev_attr->machine);
+	if (err)
+		return;
+	soc_dev_attr->family = "Integrator";
+	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%c",
+					   'A' + (intcp_sc_id & 0x0f));
+
+	soc_dev = soc_device_register(soc_dev_attr);
+	if (IS_ERR_OR_NULL(soc_dev)) {
+		kfree(soc_dev_attr->revision);
+		kfree(soc_dev_attr);
+		return;
+	}
+
+	parent = soc_device_to_device(soc_dev);
+
+	if (!IS_ERR_OR_NULL(parent))
+		integrator_init_sysfs(parent, intcp_sc_id);
+
+	of_platform_populate(root, of_default_bus_match_table,
+			intcp_auxdata_lookup, parent);
 }
 
 static const char * intcp_dt_board_compat[] = {