From: Imran Khan <kim...@codeaurora.org>

The Qualcomm socinfo driver exposes information about the SoC, its
version and its serial number to user space.

Signed-off-by: Imran Khan <kim...@codeaurora.org>
[Bjorn: Extract code to platform_driver, split patch in multiple]
Signed-off-by: Bjorn Andersson <bjorn.anders...@linaro.org>
[Vaishali: Simplify declarations, introduce qcom_socinfo struc, Fix
           memory leak, Remove extra code and Misc code refactoring]
Signed-off-by: Vaishali Thakkar <vaishali.thak...@linaro.org>
---
Changes since v1:
        - None
---
 drivers/soc/qcom/Kconfig   |   8 ++
 drivers/soc/qcom/Makefile  |   1 +
 drivers/soc/qcom/smem.c    |   8 ++
 drivers/soc/qcom/socinfo.c | 197 +++++++++++++++++++++++++++++++++++++
 4 files changed, 214 insertions(+)
 create mode 100644 drivers/soc/qcom/socinfo.c

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index fcbf8a2e4080..1e31eda07934 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -144,6 +144,14 @@ config QCOM_SMSM
          Say yes here to support the Qualcomm Shared Memory State Machine.
          The state machine is represented by bits in shared memory.
 
+config QCOM_SOCINFO
+       tristate "Qualcomm socinfo driver"
+       depends on QCOM_SMEM
+       select SOC_BUS
+       help
+        Say yes here to support the Qualcomm socinfo driver, providing
+        information about the SoC to user space.
+
 config QCOM_WCNSS_CTRL
        tristate "Qualcomm WCNSS control driver"
        depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index f25b54cd6cf8..c817da4f4140 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -14,6 +14,7 @@ qcom_rpmh-y                   += rpmh-rsc.o
 qcom_rpmh-y                    += rpmh.o
 obj-$(CONFIG_QCOM_SMD_RPM)     += smd-rpm.o
 obj-$(CONFIG_QCOM_SMEM) +=     smem.o
+obj-$(CONFIG_QCOM_SOCINFO)     += socinfo.o
 obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
 obj-$(CONFIG_QCOM_SMP2P)       += smp2p.o
 obj-$(CONFIG_QCOM_SMSM)        += smsm.o
diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index f80d040601fd..efe0b053ef82 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -276,6 +276,7 @@ struct qcom_smem {
        struct smem_partition_header *partitions[SMEM_HOST_COUNT];
        size_t cacheline[SMEM_HOST_COUNT];
        u32 item_count;
+       struct platform_device *socinfo;
 
        unsigned num_regions;
        struct smem_region regions[];
@@ -971,11 +972,18 @@ static int qcom_smem_probe(struct platform_device *pdev)
 
        __smem = smem;
 
+       smem->socinfo = platform_device_register_data(&pdev->dev, 
"qcom-socinfo",
+                                                     PLATFORM_DEVID_NONE, NULL,
+                                                     0);
+       if (IS_ERR(smem->socinfo))
+               dev_err(&pdev->dev, "failed to register socinfo device\n");
+
        return 0;
 }
 
 static int qcom_smem_remove(struct platform_device *pdev)
 {
+
        hwspin_lock_free(__smem->hwlock);
        __smem = NULL;
 
diff --git a/drivers/soc/qcom/socinfo.c b/drivers/soc/qcom/socinfo.c
new file mode 100644
index 000000000000..02078049fac7
--- /dev/null
+++ b/drivers/soc/qcom/socinfo.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2009-2017, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2019, Linaro Ltd.
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/soc/qcom/smem.h>
+#include <linux/string.h>
+#include <linux/sys_soc.h>
+#include <linux/types.h>
+
+/*
+ * SoC version type with major number in the upper 16 bits and minor
+ * number in the lower 16 bits.
+ */
+#define SOCINFO_MAJOR(ver) (((ver) >> 16) & 0xffff)
+#define SOCINFO_MINOR(ver) ((ver) & 0xffff)
+
+#define SMEM_SOCINFO_BUILD_ID_LENGTH           32
+
+/*
+ * SMEM item ids, used to acquire handles to respective
+ * SMEM region.
+ */
+#define SMEM_HW_SW_BUILD_ID            137
+
+/* Socinfo SMEM item structure */
+struct socinfo {
+       __le32 fmt;
+       __le32 id;
+       __le32 ver;
+       char build_id[SMEM_SOCINFO_BUILD_ID_LENGTH];
+       /* Version 2 */
+       __le32 raw_id;
+       __le32 raw_ver;
+       /* Version 3 */
+       __le32 hw_plat;
+       /* Version 4 */
+       __le32 plat_ver;
+       /* Version 5 */
+       __le32 accessory_chip;
+       /* Version 6 */
+       __le32 hw_plat_subtype;
+       /* Version 7 */
+       __le32 pmic_model;
+       __le32 pmic_die_rev;
+       /* Version 8 */
+       __le32 pmic_model_1;
+       __le32 pmic_die_rev_1;
+       __le32 pmic_model_2;
+       __le32 pmic_die_rev_2;
+       /* Version 9 */
+       __le32 foundry_id;
+       /* Version 10 */
+       __le32 serial_num;
+       /* Version 11 */
+       __le32 num_pmics;
+       __le32 pmic_array_offset;
+       /* Version 12 */
+       __le32 chip_family;
+       __le32 raw_device_family;
+       __le32 raw_device_num;
+};
+
+struct qcom_socinfo {
+       struct soc_device *soc_dev;
+       struct soc_device_attribute attr;
+};
+
+struct soc_of_id {
+       unsigned int id;
+       const char *name;
+};
+
+static const struct soc_of_id soc_of_id[] = {
+       {87, "MSM8960"},
+       {109, "APQ8064"},
+       {122, "MSM8660A"},
+       {123, "MSM8260A"},
+       {124, "APQ8060A"},
+       {126, "MSM8974"},
+       {130, "MPQ8064"},
+       {138, "MSM8960AB"},
+       {139, "APQ8060AB"},
+       {140, "MSM8260AB"},
+       {141, "MSM8660AB"},
+       {178, "APQ8084"},
+       {184, "APQ8074"},
+       {185, "MSM8274"},
+       {186, "MSM8674"},
+       {194, "MSM8974PRO"},
+       {206, "MSM8916"},
+       {208, "APQ8074-AA"},
+       {209, "APQ8074-AB"},
+       {210, "APQ8074PRO"},
+       {211, "MSM8274-AA"},
+       {212, "MSM8274-AB"},
+       {213, "MSM8274PRO"},
+       {214, "MSM8674-AA"},
+       {215, "MSM8674-AB"},
+       {216, "MSM8674PRO"},
+       {217, "MSM8974-AA"},
+       {218, "MSM8974-AB"},
+       {246, "MSM8996"},
+       {247, "APQ8016"},
+       {248, "MSM8216"},
+       {249, "MSM8116"},
+       {250, "MSM8616"},
+       {291, "APQ8096"},
+       {305, "MSM8996SG"},
+       {310, "MSM8996AU"},
+       {311, "APQ8096AU"},
+       {312, "APQ8096SG"},
+};
+
+static const char *socinfo_machine(struct device *dev, unsigned int id)
+{
+       int idx;
+
+       for (idx = 0; idx < ARRAY_SIZE(soc_of_id); idx++) {
+               if (soc_of_id[idx].id == id)
+                       return soc_of_id[idx].name;
+       }
+
+       if (IS_ERR(soc_of_id[idx].name))
+               dev_err(dev, "Unknown soc id\n");
+
+       return NULL;
+}
+
+static int qcom_socinfo_probe(struct platform_device *pdev)
+{
+       struct qcom_socinfo *qs;
+       struct socinfo *info;
+       size_t item_size;
+
+       info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID,
+                             &item_size);
+       if (IS_ERR(info)) {
+               dev_err(&pdev->dev, "Couldn't find socinfo\n");
+               return -EINVAL;
+       }
+
+       qs = devm_kzalloc(&pdev->dev, sizeof(*qs), GFP_KERNEL);
+       if (!qs)
+               return -ENOMEM;
+
+       qs->attr.family = "Snapdragon";
+       qs->attr.machine = socinfo_machine(&pdev->dev,
+                                          le32_to_cpu(info->id));
+       qs->attr.revision = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%u.%u",
+                                          
SOCINFO_MAJOR(le32_to_cpu(info->ver)),
+                                          
SOCINFO_MINOR(le32_to_cpu(info->ver)));
+       if (le32_to_cpu(info->fmt) >= 10)
+               qs->attr.serial_number = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+                                                       "%u",
+                                                       
le32_to_cpu(info->serial_num));
+
+       qs->soc_dev = soc_device_register(&qs->attr);
+       if (IS_ERR(qs->soc_dev))
+               return PTR_ERR(qs->soc_dev);
+
+       /* Feed the soc specific unique data into entropy pool */
+       add_device_randomness(info, item_size);
+
+       platform_set_drvdata(pdev, qs->soc_dev);
+
+       return 0;
+}
+
+static int qcom_socinfo_remove(struct platform_device *pdev)
+{
+       struct qcom_socinfo *qs = platform_get_drvdata(pdev);
+
+       soc_device_unregister(qs->soc_dev);
+
+       return 0;
+}
+
+static struct platform_driver qcom_socinfo_driver = {
+       .probe = qcom_socinfo_probe,
+       .remove = qcom_socinfo_remove,
+       .driver  = {
+               .name = "qcom-socinfo",
+       },
+};
+
+module_platform_driver(qcom_socinfo_driver);
+
+MODULE_DESCRIPTION("Qualcomm socinfo driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:qcom-socinfo");
-- 
2.17.1

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