remoteproc: Move qcom_mdt_loader into drivers/soc/qcom

With the remoteproc parts cleaned out of the MDT loader we can move it
to drivers/soc/qcom.

Acked-by: Andy Gross <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>

drivers/soc/qcom/Kconfig

@@ -10,6 +10,10 @@ config QCOM_GSBI
           functions for connecting the underlying serial UART, SPI, and I2C
           devices to the output pins.
 
+config QCOM_MDT_LOADER
+	tristate
+	select QCOM_SCM
+
 config QCOM_PM
 	bool "Qualcomm Power Management"
 	depends on ARCH_QCOM && !ARM64

drivers/soc/qcom/Makefile

@@ -1,4 +1,5 @@
 obj-$(CONFIG_QCOM_GSBI)	+=	qcom_gsbi.o
+obj-$(CONFIG_QCOM_MDT_LOADER)	+= mdt_loader.o
 obj-$(CONFIG_QCOM_PM)	+=	spm.o
 obj-$(CONFIG_QCOM_SMD) +=	smd.o
 obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o

drivers/soc/qcom/mdt_loader.c

@@ -0,0 +1,204 @@
+/*
+ * Qualcomm Peripheral Image Loader
+ *
+ * Copyright (C) 2016 Linaro Ltd
+ * Copyright (C) 2015 Sony Mobile Communications Inc
+ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/elf.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/qcom_scm.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/soc/qcom/mdt_loader.h>
+
+static bool mdt_phdr_valid(const struct elf32_phdr *phdr)
+{
+	if (phdr->p_type != PT_LOAD)
+		return false;
+
+	if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
+		return false;
+
+	if (!phdr->p_memsz)
+		return false;
+
+	return true;
+}
+
+/**
+ * qcom_mdt_get_size() - acquire size of the memory region needed to load mdt
+ * @fw:		firmware object for the mdt file
+ *
+ * Returns size of the loaded firmware blob, or -EINVAL on failure.
+ */
+ssize_t qcom_mdt_get_size(const struct firmware *fw)
+{
+	const struct elf32_phdr *phdrs;
+	const struct elf32_phdr *phdr;
+	const struct elf32_hdr *ehdr;
+	phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
+	phys_addr_t max_addr = 0;
+	int i;
+
+	ehdr = (struct elf32_hdr *)fw->data;
+	phdrs = (struct elf32_phdr *)(ehdr + 1);
+
+	for (i = 0; i < ehdr->e_phnum; i++) {
+		phdr = &phdrs[i];
+
+		if (!mdt_phdr_valid(phdr))
+			continue;
+
+		if (phdr->p_paddr < min_addr)
+			min_addr = phdr->p_paddr;
+
+		if (phdr->p_paddr + phdr->p_memsz > max_addr)
+			max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
+	}
+
+	return min_addr < max_addr ? max_addr - min_addr : -EINVAL;
+}
+EXPORT_SYMBOL_GPL(qcom_mdt_get_size);
+
+/**
+ * qcom_mdt_load() - load the firmware which header is loaded as fw
+ * @dev:	device handle to associate resources with
+ * @fw:		firmware object for the mdt file
+ * @firmware:	name of the firmware, for construction of segment file names
+ * @pas_id:	PAS identifier
+ * @mem_region:	allocated memory region to load firmware into
+ * @mem_phys:	physical address of allocated memory region
+ * @mem_size:	size of the allocated memory region
+ *
+ * Returns 0 on success, negative errno otherwise.
+ */
+int qcom_mdt_load(struct device *dev, const struct firmware *fw,
+		  const char *firmware, int pas_id, void *mem_region,
+		  phys_addr_t mem_phys, size_t mem_size)
+{
+	const struct elf32_phdr *phdrs;
+	const struct elf32_phdr *phdr;
+	const struct elf32_hdr *ehdr;
+	const struct firmware *seg_fw;
+	phys_addr_t mem_reloc;
+	phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
+	phys_addr_t max_addr = 0;
+	size_t fw_name_len;
+	size_t offset;
+	char *fw_name;
+	bool relocate = false;
+	void *ptr;
+	int ret;
+	int i;
+
+	if (!fw || !mem_region || !mem_phys || !mem_size)
+		return -EINVAL;
+
+	ehdr = (struct elf32_hdr *)fw->data;
+	phdrs = (struct elf32_phdr *)(ehdr + 1);
+
+	fw_name_len = strlen(firmware);
+	if (fw_name_len <= 4)
+		return -EINVAL;
+
+	fw_name = kstrdup(firmware, GFP_KERNEL);
+	if (!fw_name)
+		return -ENOMEM;
+
+	ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
+	if (ret) {
+		dev_err(dev, "invalid firmware metadata\n");
+		goto out;
+	}
+
+	for (i = 0; i < ehdr->e_phnum; i++) {
+		phdr = &phdrs[i];
+
+		if (!mdt_phdr_valid(phdr))
+			continue;
+
+		if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
+			relocate = true;
+
+		if (phdr->p_paddr < min_addr)
+			min_addr = phdr->p_paddr;
+
+		if (phdr->p_paddr + phdr->p_memsz > max_addr)
+			max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
+	}
+
+	if (relocate) {
+		ret = qcom_scm_pas_mem_setup(pas_id, mem_phys, max_addr - min_addr);
+		if (ret) {
+			dev_err(dev, "unable to setup relocation\n");
+			goto out;
+		}
+
+		/*
+		 * The image is relocatable, so offset each segment based on
+		 * the lowest segment address.
+		 */
+		mem_reloc = min_addr;
+	} else {
+		/*
+		 * Image is not relocatable, so offset each segment based on
+		 * the allocated physical chunk of memory.
+		 */
+		mem_reloc = mem_phys;
+	}
+
+	for (i = 0; i < ehdr->e_phnum; i++) {
+		phdr = &phdrs[i];
+
+		if (!mdt_phdr_valid(phdr))
+			continue;
+
+		offset = phdr->p_paddr - mem_reloc;
+		if (offset < 0 || offset + phdr->p_memsz > mem_size) {
+			dev_err(dev, "segment outside memory range\n");
+			ret = -EINVAL;
+			break;
+		}
+
+		ptr = mem_region + offset;
+
+		if (phdr->p_filesz) {
+			sprintf(fw_name + fw_name_len - 3, "b%02d", i);
+			ret = request_firmware(&seg_fw, fw_name, dev);
+			if (ret) {
+				dev_err(dev, "failed to load %s\n", fw_name);
+				break;
+			}
+
+			memcpy(ptr, seg_fw->data, seg_fw->size);
+
+			release_firmware(seg_fw);
+		}
+
+		if (phdr->p_memsz > phdr->p_filesz)
+			memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
+	}
+
+out:
+	kfree(fw_name);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(qcom_mdt_load);
+
+MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
+MODULE_LICENSE("GPL v2");