mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Thierry Reding](/assets/img/avatar_default.png)
These new helpers simplify implementing multi-driver modules and properly handle failure to register one driver by unregistering all previously registered drivers. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
381 lines
8.2 KiB
C
381 lines
8.2 KiB
C
/* Copyright (c) 2010-2011, Code Aurora Forum. 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*/
|
|
|
|
#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 "msm_iommu_hw-8xxx.h"
|
|
#include "msm_iommu.h"
|
|
|
|
struct iommu_ctx_iter_data {
|
|
/* input */
|
|
const char *name;
|
|
|
|
/* output */
|
|
struct device *dev;
|
|
};
|
|
|
|
static struct platform_device *msm_iommu_root_dev;
|
|
|
|
static int each_iommu_ctx(struct device *dev, void *data)
|
|
{
|
|
struct iommu_ctx_iter_data *res = data;
|
|
struct msm_iommu_ctx_dev *c = dev->platform_data;
|
|
|
|
if (!res || !c || !c->name || !res->name)
|
|
return -EINVAL;
|
|
|
|
if (!strcmp(res->name, c->name)) {
|
|
res->dev = dev;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int each_iommu(struct device *dev, void *data)
|
|
{
|
|
return device_for_each_child(dev, data, each_iommu_ctx);
|
|
}
|
|
|
|
struct device *msm_iommu_get_ctx(const char *ctx_name)
|
|
{
|
|
struct iommu_ctx_iter_data r;
|
|
int found;
|
|
|
|
if (!msm_iommu_root_dev) {
|
|
pr_err("No root IOMMU device.\n");
|
|
goto fail;
|
|
}
|
|
|
|
r.name = ctx_name;
|
|
found = device_for_each_child(&msm_iommu_root_dev->dev, &r, each_iommu);
|
|
|
|
if (!found) {
|
|
pr_err("Could not find context <%s>\n", ctx_name);
|
|
goto fail;
|
|
}
|
|
|
|
return r.dev;
|
|
fail:
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(msm_iommu_get_ctx);
|
|
|
|
static void msm_iommu_reset(void __iomem *base, int ncb)
|
|
{
|
|
int ctx;
|
|
|
|
SET_RPUE(base, 0);
|
|
SET_RPUEIE(base, 0);
|
|
SET_ESRRESTORE(base, 0);
|
|
SET_TBE(base, 0);
|
|
SET_CR(base, 0);
|
|
SET_SPDMBE(base, 0);
|
|
SET_TESTBUSCR(base, 0);
|
|
SET_TLBRSW(base, 0);
|
|
SET_GLOBAL_TLBIALL(base, 0);
|
|
SET_RPU_ACR(base, 0);
|
|
SET_TLBLKCRWE(base, 1);
|
|
|
|
for (ctx = 0; ctx < ncb; ctx++) {
|
|
SET_BPRCOSH(base, ctx, 0);
|
|
SET_BPRCISH(base, ctx, 0);
|
|
SET_BPRCNSH(base, ctx, 0);
|
|
SET_BPSHCFG(base, ctx, 0);
|
|
SET_BPMTCFG(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_CTX_TLBIALL(base, ctx, 0);
|
|
SET_TLBFLPTER(base, ctx, 0);
|
|
SET_TLBSLPTER(base, ctx, 0);
|
|
SET_TLBLKCR(base, ctx, 0);
|
|
SET_PRRR(base, ctx, 0);
|
|
SET_NMRR(base, ctx, 0);
|
|
SET_CONTEXTIDR(base, ctx, 0);
|
|
}
|
|
}
|
|
|
|
static int msm_iommu_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *r;
|
|
struct clk *iommu_clk;
|
|
struct clk *iommu_pclk;
|
|
struct msm_iommu_drvdata *drvdata;
|
|
struct msm_iommu_dev *iommu_dev = dev_get_platdata(&pdev->dev);
|
|
void __iomem *regs_base;
|
|
int ret, irq, par;
|
|
|
|
if (pdev->id == -1) {
|
|
msm_iommu_root_dev = pdev;
|
|
return 0;
|
|
}
|
|
|
|
drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
|
|
|
|
if (!drvdata) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
if (!iommu_dev) {
|
|
ret = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
iommu_pclk = clk_get(NULL, "smmu_pclk");
|
|
if (IS_ERR(iommu_pclk)) {
|
|
ret = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
ret = clk_prepare_enable(iommu_pclk);
|
|
if (ret)
|
|
goto fail_enable;
|
|
|
|
iommu_clk = clk_get(&pdev->dev, "iommu_clk");
|
|
|
|
if (!IS_ERR(iommu_clk)) {
|
|
if (clk_get_rate(iommu_clk) == 0)
|
|
clk_set_rate(iommu_clk, 1);
|
|
|
|
ret = clk_prepare_enable(iommu_clk);
|
|
if (ret) {
|
|
clk_put(iommu_clk);
|
|
goto fail_pclk;
|
|
}
|
|
} else
|
|
iommu_clk = NULL;
|
|
|
|
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase");
|
|
regs_base = devm_ioremap_resource(&pdev->dev, r);
|
|
if (IS_ERR(regs_base)) {
|
|
ret = PTR_ERR(regs_base);
|
|
goto fail_clk;
|
|
}
|
|
|
|
irq = platform_get_irq_byname(pdev, "secure_irq");
|
|
if (irq < 0) {
|
|
ret = -ENODEV;
|
|
goto fail_clk;
|
|
}
|
|
|
|
msm_iommu_reset(regs_base, iommu_dev->ncb);
|
|
|
|
SET_M(regs_base, 0, 1);
|
|
SET_PAR(regs_base, 0, 0);
|
|
SET_V2PCFG(regs_base, 0, 1);
|
|
SET_V2PPR(regs_base, 0, 0);
|
|
par = GET_PAR(regs_base, 0);
|
|
SET_V2PCFG(regs_base, 0, 0);
|
|
SET_M(regs_base, 0, 0);
|
|
|
|
if (!par) {
|
|
pr_err("%s: Invalid PAR value detected\n", iommu_dev->name);
|
|
ret = -ENODEV;
|
|
goto fail_clk;
|
|
}
|
|
|
|
ret = request_irq(irq, msm_iommu_fault_handler, 0,
|
|
"msm_iommu_secure_irpt_handler", drvdata);
|
|
if (ret) {
|
|
pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
|
|
goto fail_clk;
|
|
}
|
|
|
|
|
|
drvdata->pclk = iommu_pclk;
|
|
drvdata->clk = iommu_clk;
|
|
drvdata->base = regs_base;
|
|
drvdata->irq = irq;
|
|
drvdata->ncb = iommu_dev->ncb;
|
|
|
|
pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
|
|
iommu_dev->name, regs_base, irq, iommu_dev->ncb);
|
|
|
|
platform_set_drvdata(pdev, drvdata);
|
|
|
|
clk_disable(iommu_clk);
|
|
|
|
clk_disable(iommu_pclk);
|
|
|
|
return 0;
|
|
fail_clk:
|
|
if (iommu_clk) {
|
|
clk_disable(iommu_clk);
|
|
clk_put(iommu_clk);
|
|
}
|
|
fail_pclk:
|
|
clk_disable_unprepare(iommu_pclk);
|
|
fail_enable:
|
|
clk_put(iommu_pclk);
|
|
fail:
|
|
kfree(drvdata);
|
|
return ret;
|
|
}
|
|
|
|
static int msm_iommu_remove(struct platform_device *pdev)
|
|
{
|
|
struct msm_iommu_drvdata *drv = NULL;
|
|
|
|
drv = platform_get_drvdata(pdev);
|
|
if (drv) {
|
|
if (drv->clk) {
|
|
clk_unprepare(drv->clk);
|
|
clk_put(drv->clk);
|
|
}
|
|
clk_unprepare(drv->pclk);
|
|
clk_put(drv->pclk);
|
|
memset(drv, 0, sizeof(*drv));
|
|
kfree(drv);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int msm_iommu_ctx_probe(struct platform_device *pdev)
|
|
{
|
|
struct msm_iommu_ctx_dev *c = dev_get_platdata(&pdev->dev);
|
|
struct msm_iommu_drvdata *drvdata;
|
|
struct msm_iommu_ctx_drvdata *ctx_drvdata;
|
|
int i, ret;
|
|
|
|
if (!c || !pdev->dev.parent)
|
|
return -EINVAL;
|
|
|
|
drvdata = dev_get_drvdata(pdev->dev.parent);
|
|
if (!drvdata)
|
|
return -ENODEV;
|
|
|
|
ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
|
|
if (!ctx_drvdata)
|
|
return -ENOMEM;
|
|
|
|
ctx_drvdata->num = c->num;
|
|
ctx_drvdata->pdev = pdev;
|
|
|
|
INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
|
|
platform_set_drvdata(pdev, ctx_drvdata);
|
|
|
|
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);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* Program the M2V tables for this context */
|
|
for (i = 0; i < MAX_NUM_MIDS; i++) {
|
|
int mid = c->mids[i];
|
|
if (mid == -1)
|
|
break;
|
|
|
|
SET_M2VCBR_N(drvdata->base, mid, 0);
|
|
SET_CBACR_N(drvdata->base, c->num, 0);
|
|
|
|
/* Set VMID = 0 */
|
|
SET_VMID(drvdata->base, mid, 0);
|
|
|
|
/* Set the context number for that MID to this context */
|
|
SET_CBNDX(drvdata->base, mid, c->num);
|
|
|
|
/* Set MID associated with this context bank to 0*/
|
|
SET_CBVMID(drvdata->base, c->num, 0);
|
|
|
|
/* Set the ASID for TLB tagging for this context */
|
|
SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num);
|
|
|
|
/* Set security bit override to be Non-secure */
|
|
SET_NSCFG(drvdata->base, mid, 3);
|
|
}
|
|
|
|
clk_disable(drvdata->clk);
|
|
clk_disable(drvdata->pclk);
|
|
|
|
dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num);
|
|
return 0;
|
|
fail:
|
|
kfree(ctx_drvdata);
|
|
return ret;
|
|
}
|
|
|
|
static int msm_iommu_ctx_remove(struct platform_device *pdev)
|
|
{
|
|
struct msm_iommu_ctx_drvdata *drv = NULL;
|
|
drv = platform_get_drvdata(pdev);
|
|
if (drv) {
|
|
memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
|
|
kfree(drv);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver msm_iommu_driver = {
|
|
.driver = {
|
|
.name = "msm_iommu",
|
|
},
|
|
.probe = msm_iommu_probe,
|
|
.remove = msm_iommu_remove,
|
|
};
|
|
|
|
static struct platform_driver msm_iommu_ctx_driver = {
|
|
.driver = {
|
|
.name = "msm_iommu_ctx",
|
|
},
|
|
.probe = msm_iommu_ctx_probe,
|
|
.remove = msm_iommu_ctx_remove,
|
|
};
|
|
|
|
static struct platform_driver * const drivers[] = {
|
|
&msm_iommu_driver,
|
|
&msm_iommu_ctx_driver,
|
|
};
|
|
|
|
static int __init msm_iommu_driver_init(void)
|
|
{
|
|
return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
|
|
}
|
|
|
|
static void __exit msm_iommu_driver_exit(void)
|
|
{
|
|
platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
|
|
}
|
|
|
|
subsys_initcall(msm_iommu_driver_init);
|
|
module_exit(msm_iommu_driver_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");
|