M7350/kernel/drivers/iommu/msm_iommu_dev-v1.c

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2024-09-09 08:52:07 +00:00
/* 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 and
* only 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/iommu.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <mach/iommu_hw-v1.h>
#include <mach/iommu.h>
#include <mach/iommu_perfmon.h>
#include <mach/msm_bus.h>
static struct of_device_id msm_iommu_v1_ctx_match_table[];
static int msm_iommu_parse_bfb_settings(struct platform_device *pdev,
struct msm_iommu_drvdata *drvdata)
{
struct msm_iommu_bfb_settings *bfb_settings;
u32 nreg, nval;
int ret;
/*
* It is not valid for a device to have the qcom,iommu-bfb-regs
* property but not the qcom,iommu-bfb-data property, and vice versa.
*/
if (!of_get_property(pdev->dev.of_node, "qcom,iommu-bfb-regs", &nreg)) {
if (of_get_property(pdev->dev.of_node, "qcom,iommu-bfb-data",
&nval))
return -EINVAL;
return 0;
}
if (!of_get_property(pdev->dev.of_node, "qcom,iommu-bfb-data", &nval))
return -EINVAL;
if (nreg >= sizeof(bfb_settings->regs))
return -EINVAL;
if (nval >= sizeof(bfb_settings->data))
return -EINVAL;
if (nval != nreg)
return -EINVAL;
bfb_settings = devm_kzalloc(&pdev->dev, sizeof(*bfb_settings),
GFP_KERNEL);
if (!bfb_settings)
return -ENOMEM;
ret = of_property_read_u32_array(pdev->dev.of_node,
"qcom,iommu-bfb-regs",
bfb_settings->regs,
nreg / sizeof(*bfb_settings->regs));
if (ret)
return ret;
ret = of_property_read_u32_array(pdev->dev.of_node,
"qcom,iommu-bfb-data",
bfb_settings->data,
nval / sizeof(*bfb_settings->data));
if (ret)
return ret;
bfb_settings->length = nreg / sizeof(*bfb_settings->regs);
drvdata->bfb_settings = bfb_settings;
return 0;
}
static int __get_bus_vote_client(struct platform_device *pdev,
struct msm_iommu_drvdata *drvdata)
{
int ret = 0;
struct msm_bus_scale_pdata *bs_table;
const char *dummy;
/* Check whether bus scaling has been specified for this node */
ret = of_property_read_string(pdev->dev.of_node, "qcom,msm-bus,name",
&dummy);
if (ret)
return 0;
bs_table = msm_bus_cl_get_pdata(pdev);
if (bs_table) {
drvdata->bus_client = msm_bus_scale_register_client(bs_table);
if (IS_ERR(&drvdata->bus_client)) {
pr_err("%s(): Bus client register failed.\n", __func__);
ret = -EINVAL;
}
}
return ret;
}
static void __put_bus_vote_client(struct msm_iommu_drvdata *drvdata)
{
msm_bus_scale_unregister_client(drvdata->bus_client);
drvdata->bus_client = 0;
}
#ifdef CONFIG_IOMMU_NON_SECURE
static inline void get_secure_id(struct device_node *node,
struct msm_iommu_drvdata *drvdata)
{
}
static inline void get_secure_ctx(struct device_node *node,
struct msm_iommu_ctx_drvdata *ctx_drvdata)
{
ctx_drvdata->secure_context = 0;
}
#else
static void get_secure_id(struct device_node *node,
struct msm_iommu_drvdata *drvdata)
{
of_property_read_u32(node, "qcom,iommu-secure-id", &drvdata->sec_id);
}
static void get_secure_ctx(struct device_node *node,
struct msm_iommu_ctx_drvdata *ctx_drvdata)
{
ctx_drvdata->secure_context =
of_property_read_bool(node, "qcom,secure-context");
}
#endif
static int msm_iommu_parse_dt(struct platform_device *pdev,
struct msm_iommu_drvdata *drvdata)
{
struct device_node *child;
int ret = 0;
struct resource *r;
drvdata->dev = &pdev->dev;
ret = __get_bus_vote_client(pdev, drvdata);
if (ret)
goto fail;
ret = msm_iommu_parse_bfb_settings(pdev, drvdata);
if (ret)
goto fail;
for_each_child_of_node(pdev->dev.of_node, child)
drvdata->ncb++;
drvdata->asid = devm_kzalloc(&pdev->dev, drvdata->ncb * sizeof(int),
GFP_KERNEL);
if (!drvdata->asid) {
pr_err("Unable to get memory for asid array\n");
ret = -ENOMEM;
goto fail;
}
ret = of_property_read_string(pdev->dev.of_node, "label",
&drvdata->name);
if (ret)
goto fail;
drvdata->sec_id = -1;
get_secure_id(pdev->dev.of_node, drvdata);
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "clk_base");
if (r) {
drvdata->clk_reg_virt = devm_ioremap(&pdev->dev, r->start,
resource_size(r));
if (!drvdata->clk_reg_virt) {
pr_err("Failed to map resource for iommu clk: %pr\n",
r);
ret = -ENOMEM;
goto fail;
}
}
drvdata->halt_enabled = of_property_read_bool(pdev->dev.of_node,
"qcom,iommu-enable-halt");
ret = of_platform_populate(pdev->dev.of_node,
msm_iommu_v1_ctx_match_table,
NULL, &pdev->dev);
if (ret)
pr_err("Failed to create iommu context device\n");
msm_iommu_add_drv(drvdata);
fail:
__put_bus_vote_client(drvdata);
return ret;
}
static int msm_iommu_pmon_parse_dt(struct platform_device *pdev,
struct iommu_pmon *pmon_info)
{
int ret = 0;
int irq = platform_get_irq(pdev, 0);
unsigned int cls_prop_size;
if (irq > 0) {
pmon_info->iommu.evt_irq = platform_get_irq(pdev, 0);
ret = of_property_read_u32(pdev->dev.of_node,
"qcom,iommu-pmu-ngroups",
&pmon_info->num_groups);
if (ret) {
pr_err("Error reading qcom,iommu-pmu-ngroups\n");
goto fail;
}
ret = of_property_read_u32(pdev->dev.of_node,
"qcom,iommu-pmu-ncounters",
&pmon_info->num_counters);
if (ret) {
pr_err("Error reading qcom,iommu-pmu-ncounters\n");
goto fail;
}
if (!of_get_property(pdev->dev.of_node,
"qcom,iommu-pmu-event-classes",
&cls_prop_size)) {
pr_err("Error reading qcom,iommu-pmu-event-classes\n");
return -EINVAL;
}
pmon_info->event_cls_supported =
devm_kzalloc(&pdev->dev, cls_prop_size, GFP_KERNEL);
if (!pmon_info->event_cls_supported) {
pr_err("Unable to get memory for event class array\n");
return -ENOMEM;
}
pmon_info->nevent_cls_supported = cls_prop_size / sizeof(u32);
ret = of_property_read_u32_array(pdev->dev.of_node,
"qcom,iommu-pmu-event-classes",
pmon_info->event_cls_supported,
pmon_info->nevent_cls_supported);
if (ret) {
pr_err("Error reading qcom,iommu-pmu-event-classes\n");
return ret;
}
} else {
pmon_info->iommu.evt_irq = -1;
ret = irq;
}
fail:
return ret;
}
static int __devinit msm_iommu_probe(struct platform_device *pdev)
{
struct iommu_pmon *pmon_info;
struct msm_iommu_drvdata *drvdata;
struct resource *r;
int ret, needs_alt_core_clk;
drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iommu_base");
if (!r)
return -EINVAL;
drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
if (!drvdata->base)
return -ENOMEM;
drvdata->glb_base = drvdata->base;
if (of_get_property(pdev->dev.of_node, "vdd-supply", NULL)) {
drvdata->gdsc = devm_regulator_get(&pdev->dev, "vdd");
if (IS_ERR(drvdata->gdsc))
return PTR_ERR(drvdata->gdsc);
drvdata->alt_gdsc = devm_regulator_get(&pdev->dev,
"qcom,alt-vdd");
if (IS_ERR(drvdata->alt_gdsc))
drvdata->alt_gdsc = NULL;
} else {
pr_debug("Warning: No regulator specified for IOMMU\n");
}
drvdata->pclk = devm_clk_get(&pdev->dev, "iface_clk");
if (IS_ERR(drvdata->pclk))
return PTR_ERR(drvdata->pclk);
drvdata->clk = devm_clk_get(&pdev->dev, "core_clk");
if (IS_ERR(drvdata->clk))
return PTR_ERR(drvdata->clk);
needs_alt_core_clk = of_property_read_bool(pdev->dev.of_node,
"qcom,needs-alt-core-clk");
if (needs_alt_core_clk) {
drvdata->aclk = devm_clk_get(&pdev->dev, "alt_core_clk");
if (IS_ERR(drvdata->aclk))
return PTR_ERR(drvdata->aclk);
}
if (clk_get_rate(drvdata->clk) == 0) {
ret = clk_round_rate(drvdata->clk, 1000);
clk_set_rate(drvdata->clk, ret);
}
if (drvdata->aclk && clk_get_rate(drvdata->aclk) == 0) {
ret = clk_round_rate(drvdata->aclk, 1000);
clk_set_rate(drvdata->aclk, ret);
}
ret = msm_iommu_parse_dt(pdev, drvdata);
if (ret)
return ret;
dev_info(&pdev->dev, "device %s mapped at %p, with %d ctx banks\n",
drvdata->name, drvdata->base, drvdata->ncb);
platform_set_drvdata(pdev, drvdata);
pmon_info = msm_iommu_pm_alloc(&pdev->dev);
if (pmon_info != NULL) {
ret = msm_iommu_pmon_parse_dt(pdev, pmon_info);
if (ret) {
msm_iommu_pm_free(&pdev->dev);
pr_info("%s: pmon not available.\n", drvdata->name);
} else {
pmon_info->iommu.base = drvdata->base;
pmon_info->iommu.ops = msm_get_iommu_access_ops();
pmon_info->iommu.hw_ops = iommu_pm_get_hw_ops_v1();
pmon_info->iommu.iommu_name = drvdata->name;
ret = msm_iommu_pm_iommu_register(pmon_info);
if (ret) {
pr_err("%s iommu register fail\n",
drvdata->name);
msm_iommu_pm_free(&pdev->dev);
} else {
pr_debug("%s iommu registered for pmon\n",
pmon_info->iommu.iommu_name);
}
}
}
return 0;
}
static int __devexit msm_iommu_remove(struct platform_device *pdev)
{
struct msm_iommu_drvdata *drv = NULL;
msm_iommu_pm_iommu_unregister(&pdev->dev);
msm_iommu_pm_free(&pdev->dev);
drv = platform_get_drvdata(pdev);
if (drv) {
__put_bus_vote_client(drv);
msm_iommu_remove_drv(drv);
platform_set_drvdata(pdev, NULL);
}
return 0;
}
static int msm_iommu_ctx_parse_dt(struct platform_device *pdev,
struct msm_iommu_ctx_drvdata *ctx_drvdata)
{
struct resource *r, rp;
int irq = 0, ret = 0;
u32 nsid;
get_secure_ctx(pdev->dev.of_node, ctx_drvdata);
if (ctx_drvdata->secure_context) {
irq = platform_get_irq(pdev, 1);
if (irq > 0) {
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
msm_iommu_secure_fault_handler_v2,
IRQF_ONESHOT | IRQF_SHARED,
"msm_iommu_secure_irq", pdev);
if (ret) {
pr_err("Request IRQ %d failed with ret=%d\n",
irq, ret);
return ret;
}
}
} else {
irq = platform_get_irq(pdev, 0);
if (irq > 0) {
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
msm_iommu_fault_handler_v2,
IRQF_ONESHOT | IRQF_SHARED,
"msm_iommu_nonsecure_irq", pdev);
if (ret) {
pr_err("Request IRQ %d failed with ret=%d\n",
irq, ret);
goto out;
}
}
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
ret = -EINVAL;
goto out;
}
ret = of_address_to_resource(pdev->dev.parent->of_node, 0, &rp);
if (ret)
goto out;
/* Calculate the context bank number using the base addresses. The
* first 8 pages belong to the global address space which is followed
* by the context banks, hence subtract by 8 to get the context bank
* number.
*/
ctx_drvdata->num = ((r->start - rp.start) >> CTX_SHIFT) - 8;
if (of_property_read_string(pdev->dev.of_node, "label",
&ctx_drvdata->name))
ctx_drvdata->name = dev_name(&pdev->dev);
if (!of_get_property(pdev->dev.of_node, "qcom,iommu-ctx-sids", &nsid)) {
ret = -EINVAL;
goto out;
}
if (nsid >= sizeof(ctx_drvdata->sids)) {
ret = -EINVAL;
goto out;
}
if (of_property_read_u32_array(pdev->dev.of_node, "qcom,iommu-ctx-sids",
ctx_drvdata->sids,
nsid / sizeof(*ctx_drvdata->sids))) {
ret = -EINVAL;
goto out;
}
ctx_drvdata->nsid = nsid;
ctx_drvdata->asid = -1;
out:
return ret;
}
static int __devinit msm_iommu_ctx_probe(struct platform_device *pdev)
{
struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL;
int ret;
if (!pdev->dev.parent)
return -EINVAL;
ctx_drvdata = devm_kzalloc(&pdev->dev, sizeof(*ctx_drvdata),
GFP_KERNEL);
if (!ctx_drvdata)
return -ENOMEM;
ctx_drvdata->pdev = pdev;
INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
ret = msm_iommu_ctx_parse_dt(pdev, ctx_drvdata);
if (!ret) {
platform_set_drvdata(pdev, ctx_drvdata);
dev_info(&pdev->dev, "context %s using bank %d\n",
ctx_drvdata->name, ctx_drvdata->num);
}
return ret;
}
static int __devexit msm_iommu_ctx_remove(struct platform_device *pdev)
{
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct of_device_id msm_iommu_match_table[] = {
{ .compatible = "qcom,msm-smmu-v1", },
{}
};
static struct platform_driver msm_iommu_driver = {
.driver = {
.name = "msm_iommu_v1",
.of_match_table = msm_iommu_match_table,
},
.probe = msm_iommu_probe,
.remove = __devexit_p(msm_iommu_remove),
};
static struct of_device_id msm_iommu_v1_ctx_match_table[] = {
{ .compatible = "qcom,msm-smmu-v1-ctx", },
{}
};
static struct platform_driver msm_iommu_ctx_driver = {
.driver = {
.name = "msm_iommu_ctx_v1",
.of_match_table = msm_iommu_v1_ctx_match_table,
},
.probe = msm_iommu_ctx_probe,
.remove = __devexit_p(msm_iommu_ctx_remove),
};
static int __init msm_iommu_driver_init(void)
{
int ret;
if (!msm_soc_version_supports_iommu_v0()) {
msm_set_iommu_access_ops(&iommu_access_ops_v1);
msm_iommu_sec_set_access_ops(&iommu_access_ops_v1);
}
ret = platform_driver_register(&msm_iommu_driver);
if (ret != 0) {
pr_err("Failed to register IOMMU driver\n");
goto error;
}
ret = platform_driver_register(&msm_iommu_ctx_driver);
if (ret != 0) {
pr_err("Failed to register IOMMU context driver\n");
goto error;
}
error:
return ret;
}
static void __exit msm_iommu_driver_exit(void)
{
platform_driver_unregister(&msm_iommu_ctx_driver);
platform_driver_unregister(&msm_iommu_driver);
}
subsys_initcall(msm_iommu_driver_init);
module_exit(msm_iommu_driver_exit);
MODULE_LICENSE("GPL v2");