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Commit a358e7cd authored by Neil Armstrong's avatar Neil Armstrong
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soc: qcom: add MDSS DSM memory driver


This adds a driver for the Qualcomm Modem Processing SubSystem DSM memory
used to assign such regions of memory with remote MPSS processors.

Signed-off-by: Neil Armstrong's avatarNeil Armstrong <neil.armstrong@linaro.org>
parent 01996f92
No related merge requests found
......@@ -504,6 +504,7 @@ EXPORT_SYMBOL_GPL(of_platform_default_populate);
static const struct of_device_id reserved_mem_matches[] = {
{ .compatible = "phram" },
{ .compatible = "qcom,mpss-dsm-mem" },
{ .compatible = "qcom,rmtfs-mem" },
{ .compatible = "qcom,cmd-db" },
{ .compatible = "qcom,smem" },
......
......@@ -95,6 +95,16 @@ config QCOM_QMI_HELPERS
tristate
depends on NET
config QCOM_MPSS_DSM_MEM
tristate "Qualcomm Modem Processing SubSystem DSM memory driver"
depends on ARCH_QCOM
select QCOM_SCM
help
The Qualcomm Modem Processing SubSystem DSM memory driver is used to
assign regions of DSM memory with remote MPSS processors.
Say y here if you intend to boot the modem remoteproc.
config QCOM_RMTFS_MEM
tristate "Qualcomm Remote Filesystem memory driver"
depends on ARCH_QCOM
......
......@@ -16,6 +16,7 @@ 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-$(CONFIG_QCOM_MPSS_DSM_MEM) += mpss_dsm_mem.o
obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
obj-$(CONFIG_QCOM_SMP2P) += smp2p.o
obj-$(CONFIG_QCOM_SMSM) += smsm.o
......
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2022 Linaro Ltd.
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_reserved_mem.h>
#include <linux/slab.h>
#include <linux/qcom_scm.h>
struct qcom_mpss_dsm_mem {
phys_addr_t addr;
phys_addr_t size;
unsigned int perms;
};
static int qcom_mpss_dsm_mem_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct qcom_scm_vmperm perm;
struct reserved_mem *rmem;
struct qcom_mpss_dsm_mem *mpss_dsm_mem;
int ret;
if (!qcom_scm_is_available())
return -EPROBE_DEFER;
rmem = of_reserved_mem_lookup(node);
if (!rmem) {
dev_err(&pdev->dev, "failed to acquire memory region\n");
return -EINVAL;
}
mpss_dsm_mem = kzalloc(sizeof(*mpss_dsm_mem), GFP_KERNEL);
if (!mpss_dsm_mem)
return -ENOMEM;
mpss_dsm_mem->addr = rmem->base;
mpss_dsm_mem->size = rmem->size;
perm.vmid = QCOM_SCM_VMID_MSS_MSA;
perm.perm = QCOM_SCM_PERM_RW;
mpss_dsm_mem->perms = BIT(QCOM_SCM_VMID_HLOS);
ret = qcom_scm_assign_mem(mpss_dsm_mem->addr, mpss_dsm_mem->size,
&mpss_dsm_mem->perms, &perm, 1);
if (ret < 0) {
dev_err(&pdev->dev, "assign memory failed\n");
return ret;
}
dev_set_drvdata(&pdev->dev, mpss_dsm_mem);
return 0;
}
static int qcom_mpss_dsm_mem_remove(struct platform_device *pdev)
{
struct qcom_mpss_dsm_mem *mpss_dsm_mem = dev_get_drvdata(&pdev->dev);
struct qcom_scm_vmperm perm;
perm.vmid = QCOM_SCM_VMID_HLOS;
perm.perm = QCOM_SCM_PERM_RW;
qcom_scm_assign_mem(mpss_dsm_mem->addr, mpss_dsm_mem->size,
&mpss_dsm_mem->perms, &perm, 1);
return 0;
}
static const struct of_device_id qcom_mpss_dsm_mem_of_match[] = {
{ .compatible = "qcom,mpss-dsm-mem" },
{}
};
MODULE_DEVICE_TABLE(of, qcom_mpss_dsm_mem_of_match);
static struct platform_driver qcom_mpss_dsm_mem_driver = {
.probe = qcom_mpss_dsm_mem_probe,
.remove = qcom_mpss_dsm_mem_remove,
.driver = {
.name = "qcom_mpss_dsm_mem",
.of_match_table = qcom_mpss_dsm_mem_of_match,
},
};
module_platform_driver(qcom_mpss_dsm_mem_driver);
MODULE_AUTHOR("Linaro Ltd");
MODULE_DESCRIPTION("Qualcomm DSM memory driver");
MODULE_LICENSE("GPL");
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