linux/drivers/iommu/msm_iommu.c
Sricharan R c9220fbd77 iommu/msm: use generic ARMV7S short descriptor pagetable ops
This iommu uses the armv7 short descriptor format. So use the
generic ARMV7S pagetable ops instead of rewriting the same stuff
in the driver.

Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Tested-by: Archit Taneja <architt@codeaurora.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-06-21 13:57:13 +02:00

810 lines
19 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/errno.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/iommu.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/of_iommu.h>
#include <asm/cacheflush.h>
#include <asm/sizes.h>
#include "msm_iommu_hw-8xxx.h"
#include "msm_iommu.h"
#include "io-pgtable.h"
#define MRC(reg, processor, op1, crn, crm, op2) \
__asm__ __volatile__ ( \
" mrc " #processor "," #op1 ", %0," #crn "," #crm "," #op2 "\n" \
: "=r" (reg))
/* bitmap of the page sizes currently supported */
#define MSM_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M)
DEFINE_SPINLOCK(msm_iommu_lock);
static LIST_HEAD(qcom_iommu_devices);
static struct iommu_ops msm_iommu_ops;
struct msm_priv {
struct list_head list_attached;
struct iommu_domain domain;
struct io_pgtable_cfg cfg;
struct io_pgtable_ops *iop;
struct device *dev;
spinlock_t pgtlock; /* pagetable lock */
};
static struct msm_priv *to_msm_priv(struct iommu_domain *dom)
{
return container_of(dom, struct msm_priv, domain);
}
static int __enable_clocks(struct msm_iommu_dev *iommu)
{
int ret;
ret = clk_enable(iommu->pclk);
if (ret)
goto fail;
if (iommu->clk) {
ret = clk_enable(iommu->clk);
if (ret)
clk_disable(iommu->pclk);
}
fail:
return ret;
}
static void __disable_clocks(struct msm_iommu_dev *iommu)
{
if (iommu->clk)
clk_disable(iommu->clk);
clk_disable(iommu->pclk);
}
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_CONTEXTIDR(base, ctx, 0);
}
}
static void __flush_iotlb(void *cookie)
{
struct msm_priv *priv = cookie;
struct msm_iommu_dev *iommu = NULL;
struct msm_iommu_ctx_dev *master;
int ret = 0;
list_for_each_entry(iommu, &priv->list_attached, dom_node) {
ret = __enable_clocks(iommu);
if (ret)
goto fail;
list_for_each_entry(master, &iommu->ctx_list, list)
SET_CTX_TLBIALL(iommu->base, master->num, 0);
__disable_clocks(iommu);
}
fail:
return;
}
static void __flush_iotlb_range(unsigned long iova, size_t size,
size_t granule, bool leaf, void *cookie)
{
struct msm_priv *priv = cookie;
struct msm_iommu_dev *iommu = NULL;
struct msm_iommu_ctx_dev *master;
int ret = 0;
int temp_size;
list_for_each_entry(iommu, &priv->list_attached, dom_node) {
ret = __enable_clocks(iommu);
if (ret)
goto fail;
list_for_each_entry(master, &iommu->ctx_list, list) {
temp_size = size;
do {
iova &= TLBIVA_VA;
iova |= GET_CONTEXTIDR_ASID(iommu->base,
master->num);
SET_TLBIVA(iommu->base, master->num, iova);
iova += granule;
} while (temp_size -= granule);
}
__disable_clocks(iommu);
}
fail:
return;
}
static void __flush_iotlb_sync(void *cookie)
{
/*
* Nothing is needed here, the barrier to guarantee
* completion of the tlb sync operation is implicitly
* taken care when the iommu client does a writel before
* kick starting the other master.
*/
}
static const struct iommu_gather_ops msm_iommu_gather_ops = {
.tlb_flush_all = __flush_iotlb,
.tlb_add_flush = __flush_iotlb_range,
.tlb_sync = __flush_iotlb_sync,
};
static int msm_iommu_alloc_ctx(unsigned long *map, int start, int end)
{
int idx;
do {
idx = find_next_zero_bit(map, end, start);
if (idx == end)
return -ENOSPC;
} while (test_and_set_bit(idx, map));
return idx;
}
static void msm_iommu_free_ctx(unsigned long *map, int idx)
{
clear_bit(idx, map);
}
static void config_mids(struct msm_iommu_dev *iommu,
struct msm_iommu_ctx_dev *master)
{
int mid, ctx, i;
for (i = 0; i < master->num_mids; i++) {
mid = master->mids[i];
ctx = master->num;
SET_M2VCBR_N(iommu->base, mid, 0);
SET_CBACR_N(iommu->base, ctx, 0);
/* Set VMID = 0 */
SET_VMID(iommu->base, mid, 0);
/* Set the context number for that MID to this context */
SET_CBNDX(iommu->base, mid, ctx);
/* Set MID associated with this context bank to 0*/
SET_CBVMID(iommu->base, ctx, 0);
/* Set the ASID for TLB tagging for this context */
SET_CONTEXTIDR_ASID(iommu->base, ctx, ctx);
/* Set security bit override to be Non-secure */
SET_NSCFG(iommu->base, mid, 3);
}
}
static void __reset_context(void __iomem *base, int 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);
}
static void __program_context(void __iomem *base, int ctx,
struct msm_priv *priv)
{
__reset_context(base, ctx);
/* Turn on TEX Remap */
SET_TRE(base, ctx, 1);
SET_AFE(base, ctx, 1);
/* Set up HTW mode */
/* TLB miss configuration: perform HTW on miss */
SET_TLBMCFG(base, ctx, 0x3);
/* V2P configuration: HTW for access */
SET_V2PCFG(base, ctx, 0x3);
SET_TTBCR(base, ctx, priv->cfg.arm_v7s_cfg.tcr);
SET_TTBR0(base, ctx, priv->cfg.arm_v7s_cfg.ttbr[0]);
SET_TTBR1(base, ctx, priv->cfg.arm_v7s_cfg.ttbr[1]);
/* Set prrr and nmrr */
SET_PRRR(base, ctx, priv->cfg.arm_v7s_cfg.prrr);
SET_NMRR(base, ctx, priv->cfg.arm_v7s_cfg.nmrr);
/* Invalidate the TLB for this context */
SET_CTX_TLBIALL(base, ctx, 0);
/* Set interrupt number to "secure" interrupt */
SET_IRPTNDX(base, ctx, 0);
/* Enable context fault interrupt */
SET_CFEIE(base, ctx, 1);
/* Stall access on a context fault and let the handler deal with it */
SET_CFCFG(base, ctx, 1);
/* Redirect all cacheable requests to L2 slave port. */
SET_RCISH(base, ctx, 1);
SET_RCOSH(base, ctx, 1);
SET_RCNSH(base, ctx, 1);
/* Turn on BFB prefetch */
SET_BFBDFE(base, ctx, 1);
/* Enable the MMU */
SET_M(base, ctx, 1);
}
static struct iommu_domain *msm_iommu_domain_alloc(unsigned type)
{
struct msm_priv *priv;
if (type != IOMMU_DOMAIN_UNMANAGED)
return NULL;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
goto fail_nomem;
INIT_LIST_HEAD(&priv->list_attached);
priv->domain.geometry.aperture_start = 0;
priv->domain.geometry.aperture_end = (1ULL << 32) - 1;
priv->domain.geometry.force_aperture = true;
return &priv->domain;
fail_nomem:
kfree(priv);
return NULL;
}
static void msm_iommu_domain_free(struct iommu_domain *domain)
{
struct msm_priv *priv;
unsigned long flags;
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = to_msm_priv(domain);
kfree(priv);
spin_unlock_irqrestore(&msm_iommu_lock, flags);
}
static int msm_iommu_domain_config(struct msm_priv *priv)
{
spin_lock_init(&priv->pgtlock);
priv->cfg = (struct io_pgtable_cfg) {
.quirks = IO_PGTABLE_QUIRK_TLBI_ON_MAP,
.pgsize_bitmap = msm_iommu_ops.pgsize_bitmap,
.ias = 32,
.oas = 32,
.tlb = &msm_iommu_gather_ops,
.iommu_dev = priv->dev,
};
priv->iop = alloc_io_pgtable_ops(ARM_V7S, &priv->cfg, priv);
if (!priv->iop) {
dev_err(priv->dev, "Failed to allocate pgtable\n");
return -EINVAL;
}
msm_iommu_ops.pgsize_bitmap = priv->cfg.pgsize_bitmap;
return 0;
}
static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret = 0;
unsigned long flags;
struct msm_iommu_dev *iommu;
struct msm_priv *priv = to_msm_priv(domain);
struct msm_iommu_ctx_dev *master;
priv->dev = dev;
msm_iommu_domain_config(priv);
spin_lock_irqsave(&msm_iommu_lock, flags);
list_for_each_entry(iommu, &qcom_iommu_devices, dev_node) {
master = list_first_entry(&iommu->ctx_list,
struct msm_iommu_ctx_dev,
list);
if (master->of_node == dev->of_node) {
ret = __enable_clocks(iommu);
if (ret)
goto fail;
list_for_each_entry(master, &iommu->ctx_list, list) {
if (master->num) {
dev_err(dev, "domain already attached");
ret = -EEXIST;
goto fail;
}
master->num =
msm_iommu_alloc_ctx(iommu->context_map,
0, iommu->ncb);
if (IS_ERR_VALUE(master->num)) {
ret = -ENODEV;
goto fail;
}
config_mids(iommu, master);
__program_context(iommu->base, master->num,
priv);
}
__disable_clocks(iommu);
list_add(&iommu->dom_node, &priv->list_attached);
}
}
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
}
static void msm_iommu_detach_dev(struct iommu_domain *domain,
struct device *dev)
{
struct msm_priv *priv = to_msm_priv(domain);
unsigned long flags;
struct msm_iommu_dev *iommu;
struct msm_iommu_ctx_dev *master;
int ret;
free_io_pgtable_ops(priv->iop);
spin_lock_irqsave(&msm_iommu_lock, flags);
list_for_each_entry(iommu, &priv->list_attached, dom_node) {
ret = __enable_clocks(iommu);
if (ret)
goto fail;
list_for_each_entry(master, &iommu->ctx_list, list) {
msm_iommu_free_ctx(iommu->context_map, master->num);
__reset_context(iommu->base, master->num);
}
__disable_clocks(iommu);
}
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
}
static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t pa, size_t len, int prot)
{
struct msm_priv *priv = to_msm_priv(domain);
unsigned long flags;
int ret;
spin_lock_irqsave(&priv->pgtlock, flags);
ret = priv->iop->map(priv->iop, iova, pa, len, prot);
spin_unlock_irqrestore(&priv->pgtlock, flags);
return ret;
}
static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
size_t len)
{
struct msm_priv *priv = to_msm_priv(domain);
unsigned long flags;
spin_lock_irqsave(&priv->pgtlock, flags);
len = priv->iop->unmap(priv->iop, iova, len);
spin_unlock_irqrestore(&priv->pgtlock, flags);
return len;
}
static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t va)
{
struct msm_priv *priv;
struct msm_iommu_dev *iommu;
struct msm_iommu_ctx_dev *master;
unsigned int par;
unsigned long flags;
phys_addr_t ret = 0;
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = to_msm_priv(domain);
iommu = list_first_entry(&priv->list_attached,
struct msm_iommu_dev, dom_node);
if (list_empty(&iommu->ctx_list))
goto fail;
master = list_first_entry(&iommu->ctx_list,
struct msm_iommu_ctx_dev, list);
if (!master)
goto fail;
ret = __enable_clocks(iommu);
if (ret)
goto fail;
/* Invalidate context TLB */
SET_CTX_TLBIALL(iommu->base, master->num, 0);
SET_V2PPR(iommu->base, master->num, va & V2Pxx_VA);
par = GET_PAR(iommu->base, master->num);
/* We are dealing with a supersection */
if (GET_NOFAULT_SS(iommu->base, master->num))
ret = (par & 0xFF000000) | (va & 0x00FFFFFF);
else /* Upper 20 bits from PAR, lower 12 from VA */
ret = (par & 0xFFFFF000) | (va & 0x00000FFF);
if (GET_FAULT(iommu->base, master->num))
ret = 0;
__disable_clocks(iommu);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
}
static bool msm_iommu_capable(enum iommu_cap cap)
{
return false;
}
static void print_ctx_regs(void __iomem *base, int ctx)
{
unsigned int fsr = GET_FSR(base, ctx);
pr_err("FAR = %08x PAR = %08x\n",
GET_FAR(base, ctx), GET_PAR(base, ctx));
pr_err("FSR = %08x [%s%s%s%s%s%s%s%s%s%s]\n", fsr,
(fsr & 0x02) ? "TF " : "",
(fsr & 0x04) ? "AFF " : "",
(fsr & 0x08) ? "APF " : "",
(fsr & 0x10) ? "TLBMF " : "",
(fsr & 0x20) ? "HTWDEEF " : "",
(fsr & 0x40) ? "HTWSEEF " : "",
(fsr & 0x80) ? "MHF " : "",
(fsr & 0x10000) ? "SL " : "",
(fsr & 0x40000000) ? "SS " : "",
(fsr & 0x80000000) ? "MULTI " : "");
pr_err("FSYNR0 = %08x FSYNR1 = %08x\n",
GET_FSYNR0(base, ctx), GET_FSYNR1(base, ctx));
pr_err("TTBR0 = %08x TTBR1 = %08x\n",
GET_TTBR0(base, ctx), GET_TTBR1(base, ctx));
pr_err("SCTLR = %08x ACTLR = %08x\n",
GET_SCTLR(base, ctx), GET_ACTLR(base, ctx));
}
static void insert_iommu_master(struct device *dev,
struct msm_iommu_dev **iommu,
struct of_phandle_args *spec)
{
struct msm_iommu_ctx_dev *master = dev->archdata.iommu;
int sid;
if (list_empty(&(*iommu)->ctx_list)) {
master = kzalloc(sizeof(*master), GFP_ATOMIC);
master->of_node = dev->of_node;
list_add(&master->list, &(*iommu)->ctx_list);
dev->archdata.iommu = master;
}
for (sid = 0; sid < master->num_mids; sid++)
if (master->mids[sid] == spec->args[0]) {
dev_warn(dev, "Stream ID 0x%hx repeated; ignoring\n",
sid);
return;
}
master->mids[master->num_mids++] = spec->args[0];
}
static int qcom_iommu_of_xlate(struct device *dev,
struct of_phandle_args *spec)
{
struct msm_iommu_dev *iommu;
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&msm_iommu_lock, flags);
list_for_each_entry(iommu, &qcom_iommu_devices, dev_node)
if (iommu->dev->of_node == spec->np)
break;
if (!iommu || iommu->dev->of_node != spec->np) {
ret = -ENODEV;
goto fail;
}
insert_iommu_master(dev, &iommu, spec);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
}
irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
{
struct msm_iommu_dev *iommu = dev_id;
unsigned int fsr;
int i, ret;
spin_lock(&msm_iommu_lock);
if (!iommu) {
pr_err("Invalid device ID in context interrupt handler\n");
goto fail;
}
pr_err("Unexpected IOMMU page fault!\n");
pr_err("base = %08x\n", (unsigned int)iommu->base);
ret = __enable_clocks(iommu);
if (ret)
goto fail;
for (i = 0; i < iommu->ncb; i++) {
fsr = GET_FSR(iommu->base, i);
if (fsr) {
pr_err("Fault occurred in context %d.\n", i);
pr_err("Interesting registers:\n");
print_ctx_regs(iommu->base, i);
SET_FSR(iommu->base, i, 0x4000000F);
}
}
__disable_clocks(iommu);
fail:
spin_unlock(&msm_iommu_lock);
return 0;
}
static struct iommu_ops msm_iommu_ops = {
.capable = msm_iommu_capable,
.domain_alloc = msm_iommu_domain_alloc,
.domain_free = msm_iommu_domain_free,
.attach_dev = msm_iommu_attach_dev,
.detach_dev = msm_iommu_detach_dev,
.map = msm_iommu_map,
.unmap = msm_iommu_unmap,
.map_sg = default_iommu_map_sg,
.iova_to_phys = msm_iommu_iova_to_phys,
.pgsize_bitmap = MSM_IOMMU_PGSIZES,
.of_xlate = qcom_iommu_of_xlate,
};
static int msm_iommu_probe(struct platform_device *pdev)
{
struct resource *r;
struct msm_iommu_dev *iommu;
int ret, par, val;
iommu = devm_kzalloc(&pdev->dev, sizeof(*iommu), GFP_KERNEL);
if (!iommu)
return -ENODEV;
iommu->dev = &pdev->dev;
INIT_LIST_HEAD(&iommu->ctx_list);
iommu->pclk = devm_clk_get(iommu->dev, "smmu_pclk");
if (IS_ERR(iommu->pclk)) {
dev_err(iommu->dev, "could not get smmu_pclk\n");
return PTR_ERR(iommu->pclk);
}
ret = clk_prepare(iommu->pclk);
if (ret) {
dev_err(iommu->dev, "could not prepare smmu_pclk\n");
return ret;
}
iommu->clk = devm_clk_get(iommu->dev, "iommu_clk");
if (IS_ERR(iommu->clk)) {
dev_err(iommu->dev, "could not get iommu_clk\n");
clk_unprepare(iommu->pclk);
return PTR_ERR(iommu->clk);
}
ret = clk_prepare(iommu->clk);
if (ret) {
dev_err(iommu->dev, "could not prepare iommu_clk\n");
clk_unprepare(iommu->pclk);
return ret;
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
iommu->base = devm_ioremap_resource(iommu->dev, r);
if (IS_ERR(iommu->base)) {
dev_err(iommu->dev, "could not get iommu base\n");
ret = PTR_ERR(iommu->base);
goto fail;
}
iommu->irq = platform_get_irq(pdev, 0);
if (iommu->irq < 0) {
dev_err(iommu->dev, "could not get iommu irq\n");
ret = -ENODEV;
goto fail;
}
ret = of_property_read_u32(iommu->dev->of_node, "qcom,ncb", &val);
if (ret) {
dev_err(iommu->dev, "could not get ncb\n");
goto fail;
}
iommu->ncb = val;
msm_iommu_reset(iommu->base, iommu->ncb);
SET_M(iommu->base, 0, 1);
SET_PAR(iommu->base, 0, 0);
SET_V2PCFG(iommu->base, 0, 1);
SET_V2PPR(iommu->base, 0, 0);
par = GET_PAR(iommu->base, 0);
SET_V2PCFG(iommu->base, 0, 0);
SET_M(iommu->base, 0, 0);
if (!par) {
pr_err("Invalid PAR value detected\n");
ret = -ENODEV;
goto fail;
}
ret = devm_request_threaded_irq(iommu->dev, iommu->irq, NULL,
msm_iommu_fault_handler,
IRQF_ONESHOT | IRQF_SHARED,
"msm_iommu_secure_irpt_handler",
iommu);
if (ret) {
pr_err("Request IRQ %d failed with ret=%d\n", iommu->irq, ret);
goto fail;
}
list_add(&iommu->dev_node, &qcom_iommu_devices);
of_iommu_set_ops(pdev->dev.of_node, &msm_iommu_ops);
pr_info("device mapped at %p, irq %d with %d ctx banks\n",
iommu->base, iommu->irq, iommu->ncb);
return ret;
fail:
clk_unprepare(iommu->clk);
clk_unprepare(iommu->pclk);
return ret;
}
static const struct of_device_id msm_iommu_dt_match[] = {
{ .compatible = "qcom,apq8064-iommu" },
{}
};
static int msm_iommu_remove(struct platform_device *pdev)
{
struct msm_iommu_dev *iommu = platform_get_drvdata(pdev);
clk_unprepare(iommu->clk);
clk_unprepare(iommu->pclk);
return 0;
}
static struct platform_driver msm_iommu_driver = {
.driver = {
.name = "msm_iommu",
.of_match_table = msm_iommu_dt_match,
},
.probe = msm_iommu_probe,
.remove = msm_iommu_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");
return ret;
}
static void __exit msm_iommu_driver_exit(void)
{
platform_driver_unregister(&msm_iommu_driver);
}
subsys_initcall(msm_iommu_driver_init);
module_exit(msm_iommu_driver_exit);
static int __init msm_iommu_init(void)
{
bus_set_iommu(&platform_bus_type, &msm_iommu_ops);
return 0;
}
static int __init msm_iommu_of_setup(struct device_node *np)
{
msm_iommu_init();
return 0;
}
IOMMU_OF_DECLARE(msm_iommu_of, "qcom,apq8064-iommu", msm_iommu_of_setup);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");