Implements SoC bus support to export SoC specific information. Read the unique SoC ID from the Vybrid On Chip One Time Programmable (OCOTP) controller, SoC specific information from the Miscellaneous System Control Module (MSCM), revision from the ROM revision register and expose it via the SoC bus infrastructure.
Sample Output: root@vf:/sys/devices/soc0# cat soc_id df63c12a2e2161d4 root@vf:/sys/devices/soc0# cat family Freescale Vybrid VF500 root@vf:/sys/devices/soc0# cat revision 00000013 root@vf:/sys/devices/soc0# cat machine Freescale Vybrid Signed-off-by: Sanchayan Maity <maitysancha...@gmail.com> --- arch/arm/mach-imx/mach-vf610.c | 81 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) diff --git a/arch/arm/mach-imx/mach-vf610.c b/arch/arm/mach-imx/mach-vf610.c index 2e7c75b..64c78e4 100644 --- a/arch/arm/mach-imx/mach-vf610.c +++ b/arch/arm/mach-imx/mach-vf610.c @@ -11,6 +11,86 @@ #include <linux/irqchip.h> #include <asm/mach/arch.h> #include <asm/hardware/cache-l2x0.h> +#include <linux/slab.h> +#include <linux/sys_soc.h> +#include <linux/mfd/syscon.h> +#include <linux/regmap.h> +#include <linux/random.h> + +#define OCOTP_CFG0_OFFSET 0x00000410 +#define OCOTP_CFG1_OFFSET 0x00000420 +#define MSCM_CPxCOUNT_OFFSET 0x0000002C +#define MSCM_CPxCFG1_OFFSET 0x00000014 +#define ROM_REVISION_OFFSET 0x00000080 + +static void __init vf610_init_machine(void) +{ + struct regmap *ocotp_regmap, *mscm_regmap, *rom_regmap; + struct soc_device_attribute *soc_dev_attr; + struct device *parent = NULL; + struct soc_device *soc_dev; + char soc_type[] = "xx0"; + u32 cpxcount, cpxcfg1; + u32 soc_id1, soc_id2, rom_rev; + u64 soc_id; + + ocotp_regmap = syscon_regmap_lookup_by_compatible("fsl,vf610-ocotp"); + if (IS_ERR(ocotp_regmap)) { + pr_err("regmap lookup for octop failed\n"); + goto out; + } + + mscm_regmap = syscon_regmap_lookup_by_compatible("fsl,vf610-mscm-cpucfg"); + if (IS_ERR(mscm_regmap)) { + pr_err("regmap lookup for mscm failed"); + goto out; + } + + rom_regmap = syscon_regmap_lookup_by_compatible("fsl,vf610-ocrom"); + if (IS_ERR(rom_regmap)) { + pr_err("regmap lookup for ocrom failed"); + goto out; + } + + regmap_read(ocotp_regmap, OCOTP_CFG0_OFFSET, &soc_id1); + regmap_read(ocotp_regmap, OCOTP_CFG1_OFFSET, &soc_id2); + + soc_id = (u64) soc_id1 << 32 | soc_id2; + add_device_randomness(&soc_id, sizeof(soc_id)); + + regmap_read(mscm_regmap, MSCM_CPxCOUNT_OFFSET, &cpxcount); + regmap_read(mscm_regmap, MSCM_CPxCFG1_OFFSET, &cpxcfg1); + + soc_type[0] = cpxcount ? '6' : '5'; /* Dual Core => VF6x0 */ + soc_type[1] = cpxcfg1 ? '1' : '0'; /* L2 Cache => VFx10 */ + + regmap_read(rom_regmap, ROM_REVISION_OFFSET, &rom_rev); + + soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); + if (!soc_dev_attr) + goto out; + + soc_dev_attr->machine = kasprintf(GFP_KERNEL, "Freescale Vybrid"); + soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%016llx", soc_id); + soc_dev_attr->family = kasprintf(GFP_KERNEL, "Freescale Vybrid VF%s", + soc_type); + soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%08x", rom_rev); + + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) { + kfree(soc_dev_attr->revision); + kfree(soc_dev_attr->family); + kfree(soc_dev_attr->soc_id); + kfree(soc_dev_attr->machine); + kfree(soc_dev_attr); + goto out; + } + + parent = soc_device_to_device(soc_dev); + +out: + of_platform_populate(NULL, of_default_bus_match_table, NULL, parent); +} static const char * const vf610_dt_compat[] __initconst = { "fsl,vf500", @@ -23,5 +103,6 @@ static const char * const vf610_dt_compat[] __initconst = { DT_MACHINE_START(VYBRID_VF610, "Freescale Vybrid VF5xx/VF6xx (Device Tree)") .l2c_aux_val = 0, .l2c_aux_mask = ~0, + .init_machine = vf610_init_machine, .dt_compat = vf610_dt_compat, MACHINE_END -- 2.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/