soc: qcom: Add SoC info driver

The SoC info driver provides information such as Chip ID, Chip family, serial number and other such details about Qualcomm SoCs.

---
v3 --> v4:
- Corrected makefile so that smem and socinfo are treated as one module
- Moved the code snippet to get socinfo smem item into socinfo.c
- Removed redundant use of socinfo major version as it is always zero
- Removed unused enums
- Removed redundant indirections
- Use image_version object to store information about each entry in the smem image table
- Replaced usage of snprintf with sprintf and scnprintf
- Get the address of image version table at the beginning and setup image version attributes only if image version table is available
- Do the same for platform_subtype
- Make different type of image version objects read only or readable/ writable depending on their types. For example apps image attributes can be modified via sysfs but the same can't be done for modem image
- Show PMIC model in a human readable form rather than a numeric number
- Avoid using table in single sysfs entry
- Removed checkpatch warnings about S_IRUGO

v2 --> v3:
- Add support to toss soc information data into entropy pool
- Since socinfo is rolled into smem driver, compile the relevant portion of socinfo driver with smem driver

v1 --> v2:
- Removed inclusion of system_misc.h
- merged socinfo.h into socinfo.c
- made platform type and subtype arrays static
- replaced uint32_t with u32
- made functions static to avoid exposing vendor specific interface
- Replaced usage of IS_ERR_OR_NULL with IS_ERR.
- Remove raw-id attribute usage as human readable soc-id will suffice here
- Avoid using a separate platform driver for socinfo by rolling it into smem driver itself. The sysfs setup is being done in a separate file (socinfo.c)
- Replaced macro BUILD_ID_LENGTH with SMEM_SOCINFO_BUILD_ID_LENGTH.
- For failure cases where socinfo can not be read use a single dummy socinfo with error values.
- Removed usage of early_machine_is_xxx.

 drivers/soc/qcom/Kconfig   |    1 +
 drivers/soc/qcom/Makefile  |    3 +-
 drivers/soc/qcom/smem.c    |    5 +
 drivers/soc/qcom/socinfo.c | 1112 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 1120 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/qcom/socinfo.c

index 461b387..f89d34d 100644
@@ -24,6 +24,7 @@ config QCOM_SMEM
 	tristate "Qualcomm Shared Memory Manager (SMEM)"
 	depends on ARCH_QCOM
 	depends on HWSPINLOCK
+	select SOC_BUS
 	help
 	  Say y here to enable support for the Qualcomm Shared Memory Manager.
 	  The driver provides an interface to items in a heap shared among all

index fdd664e..438efec 100644
@@ -2,7 +2,8 @@ obj-$(CONFIG_QCOM_GSBI)	+=	qcom_gsbi.o
 obj-$(CONFIG_QCOM_PM)	+=	spm.o
 obj-$(CONFIG_QCOM_SMD) +=	smd.o
 obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o
-obj-$(CONFIG_QCOM_SMEM) +=	smem.o
+obj-$(CONFIG_QCOM_SMEM) +=	qcom_smem.o
+qcom_smem-y := smem.o socinfo.o
 obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
 obj-$(CONFIG_QCOM_SMP2P)	+= smp2p.o
 obj-$(CONFIG_QCOM_SMSM)	+= smsm.o

index 18ec52f..a57acfb0 100644
@@ -85,6 +85,9 @@
 /* Max number of processors/hosts in a system */
 #define SMEM_HOST_COUNT		9
 
+
+extern int qcom_socinfo_init(struct platform_device *pdev);
+
 /**
   * struct smem_proc_comm - proc_comm communication struct (legacy)
   * @command:	current command to be executed

@@ -751,6 +754,8 @@ static int qcom_smem_probe(struct platform_device *pdev)
 
 	__smem = smem;
 
+	qcom_socinfo_init(pdev);
+
 	return 0;
 }
 

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