soc: qcom: Add SSR minidump provision for subsystem ramdump

Memory region used to store USB PID and serial numbers to be used by

bootloader in download mode.

SSR Minidump Offset

-------------------

-Compatible: "qcom,msm-imem-minidump"

-reg: start address and size of ssr imem region

Required properties:

-compatible: "qcom,msm-imem-diag-dload"

-reg: start address and size of USB Diag download mode region in imem

			compatible = "qcom,msm-imem-emergency_download_mode";

			reg = <0xfe0 12>;

		};

		ss_mdump@b88 {

			compatible = "qcom,msm-imem-minidump";

			reg = <0xb88 28>;

		};

	};

#define PIL_NUM_DESC		10

#define MAX_LEN 96

#define NUM_OF_ENCRYPTED_KEY	3

static void __iomem *pil_info_base;

static void __iomem *pil_minidump_base;

/**

 * proxy_timeout - Override for proxy vote timeouts

	struct elf32_phdr phdr[];

};

/**

 * struct boot_minidump_smem_region - Representation of SMEM TOC

 * @region_name: Name of modem segment to be dumped

 * @region_base_address: Where segment start from

 * @region_size: Size of segment to be dumped

 */

struct boot_minidump_smem_region {

	char region_name[16];

	u64 region_base_address;

	u64 region_size;

};

/**

 * struct pil_seg - memory map representing one segment

 * @next: points to next seg mentor NULL if last segment

	phys_addr_t region_end;

	void *region;

	struct pil_image_info __iomem *info;

	struct md_ssr_ss_info __iomem *minidump;

	int minidump_id;

	int id;

	int unvoted_flag;

	size_t region_size;

};

static int pil_do_minidump(struct pil_desc *desc, void *ramdump_dev)

{

	struct boot_minidump_smem_region __iomem *region_info;

	struct ramdump_segment *ramdump_segs, *s;

	struct pil_priv *priv = desc->priv;

	void __iomem *subsys_smem_base;

	void __iomem *offset;

	int ss_mdump_seg_cnt;

	int ret, i;

	memcpy(&offset, &priv->minidump, sizeof(priv->minidump));

	offset = offset + sizeof(priv->minidump->md_ss_smem_regions_baseptr);

	/* There are 3 encryption keys which also need to be dumped */

	ss_mdump_seg_cnt = readb_relaxed(offset) +

				NUM_OF_ENCRYPTED_KEY;

	subsys_smem_base = ioremap(__raw_readl(priv->minidump),

				   ss_mdump_seg_cnt * sizeof(*region_info));

	region_info =

		(struct boot_minidump_smem_region __iomem *)subsys_smem_base;

	ramdump_segs = kcalloc(ss_mdump_seg_cnt,

			       sizeof(*ramdump_segs), GFP_KERNEL);

	if (!ramdump_segs)

		return -ENOMEM;

	if (desc->subsys_vmid > 0)

		ret = pil_assign_mem_to_linux(desc, priv->region_start,

			(priv->region_end - priv->region_start));

	s = ramdump_segs;

	for (i = 0; i < ss_mdump_seg_cnt; i++) {

		memcpy(&offset, &region_info, sizeof(region_info));

		memcpy(&s->name, &region_info, sizeof(region_info));

		offset = offset + sizeof(region_info->region_name);

		s->address = __raw_readl(offset);

		offset = offset + sizeof(region_info->region_base_address);

		s->size = __raw_readl(offset);

		s++;

		region_info++;

	}

	ret = do_minidump(ramdump_dev, ramdump_segs, ss_mdump_seg_cnt);

	kfree(ramdump_segs);

	if (ret)

		pil_err(desc, "%s: Ramdump collection failed for subsys %s rc:%d\n",

			__func__, desc->name, ret);

	writel_relaxed(0, &priv->minidump->md_ss_smem_regions_baseptr);

	writeb_relaxed(1, &priv->minidump->md_ss_ssr_cause);

	if (desc->subsys_vmid > 0)

		ret = pil_assign_mem_to_subsys(desc, priv->region_start,

			(priv->region_end - priv->region_start));

	return ret;

}

/**

 * pil_do_ramdump() - Ramdump an image

 * @desc: descriptor from pil_desc_init()

	int count = 0, ret;

	struct ramdump_segment *ramdump_segs, *s;

	if (priv->minidump && (__raw_readl(priv->minidump) > 0))

		return pil_do_minidump(desc, ramdump_dev);

	list_for_each_entry(seg, &priv->segs, list)

		count++;

int pil_desc_init(struct pil_desc *desc)

{

	struct pil_priv *priv;

	int ret;

	void __iomem *addr;

	int ret, ss_imem_offset_mdump;

	char buf[sizeof(priv->info->name)];

	struct device_node *ofnode = desc->dev->of_node;

	if (WARN(desc->ops->proxy_unvote && !desc->ops->proxy_vote,

				"Invalid proxy voting. Ignoring\n"))

		strlcpy(buf, desc->name, sizeof(buf));

		__iowrite32_copy(priv->info->name, buf, sizeof(buf) / 4);

	}

	if (of_property_read_u32(ofnode, "qcom,minidump-id",

		&priv->minidump_id))

		pr_debug("minidump-id not found for %s\n", desc->name);

	else {

		ss_imem_offset_mdump =

			sizeof(struct md_ssr_ss_info) * priv->minidump_id;

		if (pil_minidump_base) {

			/* Add 0x4 to get start of struct md_ssr_ss_info base

			 * from struct md_ssr_toc for any subsystem,

			 * struct md_ssr_ss_info is actually the pointer

			 * of ToC in smem for any subsystem.

			 */

			addr = pil_minidump_base + ss_imem_offset_mdump + 0x4;

			priv->minidump = (struct md_ssr_ss_info __iomem *)addr;

		}

	}

	ret = pil_parse_devicetree(desc);

	if (ret)

	for (i = 0; i < resource_size(&res)/sizeof(u32); i++)

		writel_relaxed(0, pil_info_base + (i * sizeof(u32)));

	np = of_find_compatible_node(NULL, NULL, "qcom,msm-imem-minidump");

	if (!np) {

		pr_warn("pil: failed to find qcom,msm-imem-minidump node\n");

		goto out;

	} else {

		pil_minidump_base = of_iomap(np, 0);

		if (!pil_minidump_base) {

			pr_err("unable to map pil minidump imem offset\n");

			goto out;

		}

	}

	for (i = 0; i < sizeof(struct md_ssr_toc)/sizeof(u32); i++)

		writel_relaxed(0, pil_minidump_base + (i * sizeof(u32)));

	writel_relaxed(1, pil_minidump_base);

out:

	return register_pm_notifier(&pil_pm_notifier);

}

	unregister_pm_notifier(&pil_pm_notifier);

	if (pil_info_base)

		iounmap(pil_info_base);

	if (pil_minidump_base)

		iounmap(pil_minidump_base);

}

module_exit(msm_pil_exit);

	__le32 size;

} __attribute__((__packed__));

#define MAX_NUM_OF_SS 3

/**

 * struct md_ssr_ss_info - Info in imem about smem ToC

 * @md_ss_smem_regions_baseptr: Start physical address of SMEM TOC

 * @md_ss_num_of_regions: number of segments that need to be dumped

 * @md_ss_encryption_status: status of encryption of segments

 * @md_ss_ssr_cause: ssr cause enum

 */

struct md_ssr_ss_info {

	u32 md_ss_smem_regions_baseptr;

	u8 md_ss_num_of_regions;

	u8 md_ss_encryption_status;

	u8 md_ss_ssr_cause;

	u8 reserved;

};

/**

 * struct md_ssr_toc - Wrapper of struct md_ssr_ss_info

 * @md_ssr_toc_init: flag to indicate to MSS SW about imem init done

 * @md_ssr_ss: Instance of struct md_ssr_ss_info for a subsystem

 */

struct md_ssr_toc /* Shared IMEM ToC struct */

{

	u32 md_ssr_toc_init;

	struct md_ssr_ss_info	md_ssr_ss[MAX_NUM_OF_SS];

};

/**

 * struct pil_reset_ops - PIL operations

 * @init_image: prepare an image for authentication

		int nsegments);

extern int do_elf_ramdump(void *handle, struct ramdump_segment *segments,

		int nsegments);

extern int do_minidump(void *handle, struct ramdump_segment *segments,

		       int nsegments);

#else

static inline void *create_ramdump_device(const char *dev_name,