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>

4 files changed, 65 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/arm/arm-boards b/Documentation/devicetree/bindings/arm/arm-boards
index fc81a7d6b0f1..db5858e32d3f 100644
--- a/Documentation/devicetree/bindings/arm/arm-boards
+++ b/Documentation/devicetree/bindings/arm/arm-boards
@@ -9,6 +9,10 @@ Required properties (in root node):
 
 FPGA type interrupt controllers, see the versatile-fpga-irq binding doc.
 
+In the root node the Integrator/CP must have a /cpcon node pointing
+to the CP control registers, and the Integrator/AP must have a
+/syscon node pointing to the Integrator/AP system controller.
+
 
 ARM Versatile Application and Platform Baseboards
 -------------------------------------------------
diff --git a/arch/arm/boot/dts/integratorcp.dts b/arch/arm/boot/dts/integratorcp.dts
index 2dd5e4e48481..8b119399025a 100644
--- a/arch/arm/boot/dts/integratorcp.dts
+++ b/arch/arm/boot/dts/integratorcp.dts
@@ -18,6 +18,11 @@
                 bootargs = "root=/dev/ram0 console=ttyAMA0,38400n8 earlyprintk";
         };
 
+        cpcon {
+                /* CP controller registers */
+                reg = <0xcb000000 0x100>;
+        };
+
         timer0: timer@13000000 {
                 compatible = "arm,sp804", "arm,primecell";
         };
diff --git a/arch/arm/mach-integrator/Kconfig b/arch/arm/mach-integrator/Kconfig
index 3961942c9e11..abeff25532ab 100644
--- a/arch/arm/mach-integrator/Kconfig
+++ b/arch/arm/mach-integrator/Kconfig
@@ -20,6 +20,7 @@ config ARCH_INTEGRATOR_CP
         select PLAT_VERSATILE_CLCD
         select SERIAL_AMBA_PL011
         select SERIAL_AMBA_PL011_CONSOLE
+        select SOC_BUS
         help
           Include support for the ARM(R) Integrator CP platform.
 
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[] = {