blob: 549800f62aa8876174fbef80b11866491b6c15a5 [file] [log] [blame]
/* Copyright (c) 2010-2013, 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/list.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <mach/iommu_perfmon.h>
#include <mach/iommu_hw-v0.h>
#include <mach/iommu.h>
static DEFINE_MUTEX(iommu_list_lock);
static LIST_HEAD(iommu_list);
void msm_iommu_add_drv(struct msm_iommu_drvdata *drv)
{
mutex_lock(&iommu_list_lock);
list_add(&drv->list, &iommu_list);
mutex_unlock(&iommu_list_lock);
}
void msm_iommu_remove_drv(struct msm_iommu_drvdata *drv)
{
mutex_lock(&iommu_list_lock);
list_del(&drv->list);
mutex_unlock(&iommu_list_lock);
}
static int find_iommu_ctx(struct device *dev, void *data)
{
struct msm_iommu_ctx_drvdata *c;
c = dev_get_drvdata(dev);
if (!c || !c->name)
return 0;
return !strcmp(data, c->name);
}
static struct device *find_context(struct device *dev, const char *name)
{
return device_find_child(dev, (void *)name, find_iommu_ctx);
}
struct device *msm_iommu_get_ctx(const char *ctx_name)
{
struct msm_iommu_drvdata *drv;
struct device *dev = NULL;
mutex_lock(&iommu_list_lock);
list_for_each_entry(drv, &iommu_list, list) {
dev = find_context(drv->dev, ctx_name);
if (dev)
break;
}
mutex_unlock(&iommu_list_lock);
if (!dev || !dev_get_drvdata(dev))
pr_err("Could not find context <%s>\n", ctx_name);
put_device(dev);
return dev;
}
EXPORT_SYMBOL(msm_iommu_get_ctx);
static void msm_iommu_reset(void __iomem *base, void __iomem *glb_base, int ncb)
{
int ctx;
SET_RPUE(glb_base, 0);
SET_RPUEIE(glb_base, 0);
SET_ESRRESTORE(glb_base, 0);
SET_TBE(glb_base, 0);
SET_CR(glb_base, 0);
SET_SPDMBE(glb_base, 0);
SET_TESTBUSCR(glb_base, 0);
SET_TLBRSW(glb_base, 0);
SET_GLOBAL_TLBIALL(glb_base, 0);
SET_RPU_ACR(glb_base, 0);
SET_TLBLKCRWE(glb_base, 1);
for (ctx = 0; ctx < ncb; ctx++) {
SET_BPRCOSH(glb_base, ctx, 0);
SET_BPRCISH(glb_base, ctx, 0);
SET_BPRCNSH(glb_base, ctx, 0);
SET_BPSHCFG(glb_base, ctx, 0);
SET_BPMTCFG(glb_base, ctx, 0);
SET_ACTLR(base, ctx, 0);
SET_SCTLR(base, ctx, 0);
SET_FSRRESTORE(base, ctx, 0);
SET_TTBR0(base, ctx, 0);
SET_TTBR1(base, ctx, 0);
SET_TTBCR(base, ctx, 0);
SET_BFBCR(base, ctx, 0);
SET_PAR(base, ctx, 0);
SET_FAR(base, ctx, 0);
SET_TLBFLPTER(base, ctx, 0);
SET_TLBSLPTER(base, ctx, 0);
SET_TLBLKCR(base, ctx, 0);
SET_CTX_TLBIALL(base, ctx, 0);
SET_TLBIVA(base, ctx, 0);
SET_PRRR(base, ctx, 0);
SET_NMRR(base, ctx, 0);
SET_CONTEXTIDR(base, ctx, 0);
}
mb();
}
static int msm_iommu_parse_dt(struct platform_device *pdev,
struct msm_iommu_drvdata *drvdata)
{
#ifdef CONFIG_OF_DEVICE
struct device_node *child;
struct resource *r;
u32 glb_offset = 0;
int ret;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
pr_err("%s: Missing property reg\n", __func__);
return -EINVAL;
}
drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
if (!drvdata->base) {
pr_err("%s: Unable to ioremap %pr\n", __func__, r);
return -ENOMEM;
}
drvdata->glb_base = drvdata->base;
if (!of_property_read_u32(pdev->dev.of_node, "qcom,glb-offset",
&glb_offset)) {
drvdata->glb_base += glb_offset;
} else {
pr_err("%s: Missing property qcom,glb-offset\n", __func__);
return -EINVAL;
}
for_each_child_of_node(pdev->dev.of_node, child) {
drvdata->ncb++;
if (!of_platform_device_create(child, NULL, &pdev->dev))
pr_err("Failed to create %s device\n", child->name);
}
ret = of_property_read_string(pdev->dev.of_node, "label",
&drvdata->name);
if (ret) {
pr_err("%s: Missing property label\n", __func__);
return -EINVAL;
}
drvdata->sec_id = -1;
drvdata->ttbr_split = 0;
#endif
return 0;
}
static int __get_clocks(struct platform_device *pdev,
struct msm_iommu_drvdata *drvdata)
{
int ret = 0;
drvdata->pclk = clk_get(&pdev->dev, "iface_clk");
if (IS_ERR(drvdata->pclk)) {
ret = PTR_ERR(drvdata->pclk);
drvdata->pclk = NULL;
pr_err("Unable to get %s clock for %s IOMMU device\n",
dev_name(&pdev->dev), drvdata->name);
goto fail;
}
drvdata->clk = clk_get(&pdev->dev, "core_clk");
if (!IS_ERR(drvdata->clk)) {
if (clk_get_rate(drvdata->clk) == 0) {
ret = clk_round_rate(drvdata->clk, 1000);
clk_set_rate(drvdata->clk, ret);
}
} else {
drvdata->clk = NULL;
}
return 0;
fail:
return ret;
}
static void __put_clocks(struct msm_iommu_drvdata *drvdata)
{
if (drvdata->clk)
clk_put(drvdata->clk);
clk_put(drvdata->pclk);
}
static int __enable_clocks(struct msm_iommu_drvdata *drvdata)
{
int ret;
ret = clk_prepare_enable(drvdata->pclk);
if (ret)
goto fail;
if (drvdata->clk) {
ret = clk_prepare_enable(drvdata->clk);
if (ret)
clk_disable_unprepare(drvdata->pclk);
}
fail:
return ret;
}
static void __disable_clocks(struct msm_iommu_drvdata *drvdata)
{
if (drvdata->clk)
clk_disable_unprepare(drvdata->clk);
clk_disable_unprepare(drvdata->pclk);
}
/*
* Do a basic check of the IOMMU by performing an ATS operation
* on context bank 0.
*/
static int iommu_sanity_check(struct msm_iommu_drvdata *drvdata)
{
int par;
int ret = 0;
SET_M(drvdata->base, 0, 1);
SET_PAR(drvdata->base, 0, 0);
SET_V2PCFG(drvdata->base, 0, 1);
SET_V2PPR(drvdata->base, 0, 0);
mb();
par = GET_PAR(drvdata->base, 0);
SET_V2PCFG(drvdata->base, 0, 0);
SET_M(drvdata->base, 0, 0);
mb();
if (!par) {
pr_err("%s: Invalid PAR value detected\n", drvdata->name);
ret = -ENODEV;
}
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 msm_iommu_probe(struct platform_device *pdev)
{
struct iommu_pmon *pmon_info;
struct msm_iommu_drvdata *drvdata;
struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data;
int ret;
drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata) {
ret = -ENOMEM;
goto fail;
}
if (pdev->dev.of_node) {
ret = msm_iommu_parse_dt(pdev, drvdata);
if (ret)
goto fail;
} else if (pdev->dev.platform_data) {
struct resource *r, *r2;
resource_size_t len;
r = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"physbase");
if (!r) {
ret = -ENODEV;
goto fail;
}
len = resource_size(r);
r2 = request_mem_region(r->start, len, r->name);
if (!r2) {
pr_err("Could not request memory region: %pr\n", r);
ret = -EBUSY;
goto fail;
}
drvdata->base = devm_ioremap(&pdev->dev, r2->start, len);
if (!drvdata->base) {
pr_err("Could not ioremap: %pr\n", r);
ret = -EBUSY;
goto fail;
}
/*
* Global register space offset for legacy IOMMUv1 hardware
* is always 0xFF000
*/
drvdata->glb_base = drvdata->base + 0xFF000;
drvdata->name = iommu_dev->name;
drvdata->dev = &pdev->dev;
drvdata->ncb = iommu_dev->ncb;
drvdata->ttbr_split = iommu_dev->ttbr_split;
} else {
ret = -ENODEV;
goto fail;
}
drvdata->dev = &pdev->dev;
ret = __get_clocks(pdev, drvdata);
if (ret)
goto fail;
__enable_clocks(drvdata);
msm_iommu_reset(drvdata->base, drvdata->glb_base, drvdata->ncb);
ret = iommu_sanity_check(drvdata);
if (ret)
goto fail_clk;
pr_info("device %s mapped at %p, with %d ctx banks\n",
drvdata->name, drvdata->base, drvdata->ncb);
msm_iommu_add_drv(drvdata);
platform_set_drvdata(pdev, drvdata);
__disable_clocks(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 = &iommu_access_ops_v0;
pmon_info->iommu.hw_ops = iommu_pm_get_hw_ops_v0();
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;
fail_clk:
__disable_clocks(drvdata);
__put_clocks(drvdata);
fail:
return ret;
}
static int msm_iommu_remove(struct platform_device *pdev)
{
struct msm_iommu_drvdata *drv = NULL;
drv = platform_get_drvdata(pdev);
if (drv) {
msm_iommu_remove_drv(drv);
if (drv->clk)
clk_put(drv->clk);
clk_put(drv->pclk);
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, ret;
u32 nmid_array_size;
u32 nmid;
irq = platform_get_irq(pdev, 0);
if (irq > 0) {
ret = request_threaded_irq(irq, NULL,
msm_iommu_fault_handler,
IRQF_ONESHOT | IRQF_SHARED,
"msm_iommu_nonsecure_irq", ctx_drvdata);
if (ret) {
pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
return ret;
}
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
pr_err("Could not find reg property for context bank\n");
return -EINVAL;
}
ret = of_address_to_resource(pdev->dev.parent->of_node, 0, &rp);
if (ret) {
pr_err("of_address_to_resource failed\n");
return -EINVAL;
}
/* Calculate the context bank number using the base addresses. CB0
* starts at the base address.
*/
ctx_drvdata->num = ((r->start - rp.start) >> CTX_SHIFT);
if (of_property_read_string(pdev->dev.of_node, "label",
&ctx_drvdata->name)) {
pr_err("Could not find label property\n");
return -EINVAL;
}
if (!of_get_property(pdev->dev.of_node, "qcom,iommu-ctx-mids",
&nmid_array_size)) {
pr_err("Could not find iommu-ctx-mids property\n");
return -EINVAL;
}
if (nmid_array_size >= sizeof(ctx_drvdata->sids)) {
pr_err("Too many mids defined - array size: %u, mids size: %u\n",
nmid_array_size, sizeof(ctx_drvdata->sids));
return -EINVAL;
}
nmid = nmid_array_size / sizeof(*ctx_drvdata->sids);
if (of_property_read_u32_array(pdev->dev.of_node, "qcom,iommu-ctx-mids",
ctx_drvdata->sids, nmid)) {
pr_err("Could not find iommu-ctx-mids property\n");
return -EINVAL;
}
ctx_drvdata->nsid = nmid;
return 0;
}
static void __program_m2v_tables(struct msm_iommu_drvdata *drvdata,
struct msm_iommu_ctx_drvdata *ctx_drvdata)
{
int i;
/* Program the M2V tables for this context */
for (i = 0; i < ctx_drvdata->nsid; i++) {
int sid = ctx_drvdata->sids[i];
int num = ctx_drvdata->num;
SET_M2VCBR_N(drvdata->glb_base, sid, 0);
SET_CBACR_N(drvdata->glb_base, num, 0);
/* Route page faults to the non-secure interrupt */
SET_IRPTNDX(drvdata->glb_base, num, 1);
/* Set VMID = 0 */
SET_VMID(drvdata->glb_base, sid, 0);
/* Set the context number for that SID to this context */
SET_CBNDX(drvdata->glb_base, sid, num);
/* Set SID associated with this context bank to 0 */
SET_CBVMID(drvdata->glb_base, num, 0);
/* Set the ASID for TLB tagging for this context to 0 */
SET_CONTEXTIDR_ASID(drvdata->base, num, 0);
/* Set security bit override to be Non-secure */
SET_NSCFG(drvdata->glb_base, sid, 3);
}
mb();
}
static int msm_iommu_ctx_probe(struct platform_device *pdev)
{
struct msm_iommu_drvdata *drvdata;
struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL;
int i, ret, irq;
if (!pdev->dev.parent) {
ret = -EINVAL;
goto fail;
}
drvdata = dev_get_drvdata(pdev->dev.parent);
if (!drvdata) {
ret = -ENODEV;
goto fail;
}
ctx_drvdata = devm_kzalloc(&pdev->dev, sizeof(*ctx_drvdata),
GFP_KERNEL);
if (!ctx_drvdata) {
ret = -ENOMEM;
goto fail;
}
ctx_drvdata->pdev = pdev;
INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
platform_set_drvdata(pdev, ctx_drvdata);
ctx_drvdata->attach_count = 0;
if (pdev->dev.of_node) {
ret = msm_iommu_ctx_parse_dt(pdev, ctx_drvdata);
if (ret)
goto fail;
} else if (pdev->dev.platform_data) {
struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
ctx_drvdata->num = c->num;
ctx_drvdata->name = c->name;
for (i = 0; i < MAX_NUM_MIDS; ++i) {
if (c->mids[i] == -1) {
ctx_drvdata->nsid = i;
break;
}
ctx_drvdata->sids[i] = c->mids[i];
}
irq = platform_get_irq_byname(
to_platform_device(pdev->dev.parent),
"nonsecure_irq");
if (irq < 0) {
ret = -ENODEV;
goto fail;
}
ret = request_threaded_irq(irq, NULL, msm_iommu_fault_handler,
IRQF_ONESHOT | IRQF_SHARED,
"msm_iommu_nonsecure_irq", ctx_drvdata);
if (ret) {
pr_err("request_threaded_irq %d failed: %d\n", irq,
ret);
goto fail;
}
} else {
ret = -ENODEV;
goto fail;
}
__enable_clocks(drvdata);
__program_m2v_tables(drvdata, ctx_drvdata);
__disable_clocks(drvdata);
dev_info(&pdev->dev, "context %s using bank %d\n", ctx_drvdata->name,
ctx_drvdata->num);
return 0;
fail:
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-v0", },
{}
};
static struct platform_driver msm_iommu_driver = {
.driver = {
.name = "msm_iommu-v0",
.of_match_table = msm_iommu_match_table,
},
.probe = msm_iommu_probe,
.remove = __devexit_p(msm_iommu_remove),
};
static struct of_device_id msm_iommu_ctx_match_table[] = {
{ .name = "qcom,iommu-ctx", },
{}
};
static struct platform_driver msm_iommu_ctx_driver = {
.driver = {
.name = "msm_iommu_ctx",
.of_match_table = msm_iommu_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;
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");
MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");