From 64100a03ad0b94a45ed2753632d9dd68379ad3ac Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Fri, 2 Nov 2012 01:20:43 +0100 Subject: [PATCH] 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 Acked-by: Arnd Bergmann Signed-off-by: Linus Walleij --- .../devicetree/bindings/arm/arm-boards | 4 ++ arch/arm/boot/dts/integratorcp.dts | 5 ++ arch/arm/mach-integrator/Kconfig | 1 + arch/arm/mach-integrator/integrator_cp.c | 57 ++++++++++++++++++- 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 #include #include +#include #include #include @@ -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[] = { -- 2.30.2