Hi Sanchayan, The implementation looks good from my perspective. While the output differs a bit from what i.MX6 provides, I think its closer to what is specified. Also I like that we have the ROM revision available, since this information is relevant to identify early versions of the chip which have had issues...
Some minor things below. On 2015-05-11 07:11, Sanchayan Maity wrote: > 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. > > Signed-off-by: Sanchayan Maity <[email protected]> > --- > arch/arm/mach-imx/mach-vf610.c | 76 > +++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 75 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/mach-imx/mach-vf610.c b/arch/arm/mach-imx/mach-vf610.c > index 1ba7738..74681f1 100644 > --- a/arch/arm/mach-imx/mach-vf610.c > +++ b/arch/arm/mach-imx/mach-vf610.c > @@ -9,13 +9,87 @@ > > #include <linux/of_platform.h> > #include <linux/irqchip.h> > +#include <linux/slab.h> > +#include <linux/sys_soc.h> > +#include <linux/mfd/syscon.h> > +#include <linux/regmap.h> > +#include <linux/random.h> > +#include <linux/io.h> > #include <asm/mach/arch.h> > #include <asm/hardware/cache-l2x0.h> > #include "common.h" > > +#define OCOTP_CFG0_OFFSET 0x00000410 > +#define OCOTP_CFG1_OFFSET 0x00000420 > +#define MSCM_CPxCOUNT_OFFSET 0x0000002C > +#define MSCM_CPxCFG1_OFFSET 0x00000014 > +#define ROM_REVISION_REGISTER 0x00000080 > + > static void __init vf610_init_machine(void) > { > - of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); > + struct regmap *ocotp_regmap, *mscm_regmap; > + struct soc_device_attribute *soc_dev_attr; > + struct device *parent = NULL; > + struct soc_device *soc_dev; > + char soc_type[] = "xx0"; > + void __iomem *rom_rev; > + u32 cpxcount, cpxcfg1; > + u32 soc_id1, soc_id2; > + 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; > + } > + > + 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 */ > + > + soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); > + if (!soc_dev_attr) > + goto out; This out seems not to take care of the memory allocated just above. > + > + soc_dev_attr->machine = kasprintf(GFP_KERNEL, "Freescale Vybrid"); > + soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%llx", soc_id); I would prefer %016llx as format, that shows that we have 64 bit identifier even when the highest bit is 0. > + soc_dev_attr->family = kasprintf(GFP_KERNEL, "Freescale Vybrid VF%s", > + soc_type); > + > + rom_rev = ioremap(ROM_REVISION_REGISTER, SZ_1); > + if (rom_rev) > + soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%08x", > + readl(rom_rev)); We should add the ROM to the device tree too. The memory map documented in the RM states that the ROM is accessable at 0x0000_0000-0x007fffff, that would be 8MiB. However, according to the RM, the on-chip ROM is only 96KiB. I quickly checked, U-Boot crashed when reading after 0x00018000, which is the 96KiB boundary, hence I would add a DT node with compatible fsl,vf610-ocrom or something which has a register range from 0x0-0x00017fff. > + > + soc_dev = soc_device_register(soc_dev_attr); > + if (IS_ERR(soc_dev)) { > + if (!rom_rev) > + 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); > vf610_pm_init(); > } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
