/*
* IOMMU API for QCOM secure IOMMUs. Somewhat based on arm-smmu.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License 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, see <http://www.gnu.org/licenses/>.
*
* Copyright (C) 2013 ARM Limited
* Copyright (C) 2017 Red Hat
*/
#include <linux/atomic.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/kconfig.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_iommu.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/qcom_scm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include "io-pgtable.h"
#include "arm-smmu-regs.h"
#define SMMU_INTR_SEL_NS 0x2000
struct qcom_iommu_ctx;
struct qcom_iommu_dev {
/* IOMMU core code handle */
struct iommu_device iommu;
struct device *dev;
struct clk *iface_clk;
struct clk *bus_clk;
void __iomem *local_base;
u32 sec_id;
u8 num_ctxs;
struct qcom_iommu_ctx *ctxs[0]; /* indexed by asid-1 */
};
struct qcom_iommu_ctx {
struct device *dev;
void __iomem *base;
bool secure_init;
u8 asid; /* asid and ctx bank # are 1:1 */
struct iommu_domain *domain;
};
struct qcom_iommu_domain {
struct io_pgtable_ops *pgtbl_ops;
spinlock_t pgtbl_lock;
struct mutex init_mutex; /* Protects iommu pointer */
struct iommu_domain domain;
struct qcom_iommu_dev *iommu;
};
static struct qcom_iommu_domain *to_qcom_iommu_domain(struct iommu_domain *dom)
{
return container_of(dom, struct qcom_iommu_domain, domain);
}
static const struct iommu_ops qcom_iommu_ops;
static struct qcom_iommu_dev * to_iommu(struct iommu_fwspec *fwspec)
{
if (!fwspec || fwspec->ops != &qcom_iommu_ops)
return NULL;
return fwspec->iommu_priv;
}
static struct qcom_iommu_ctx * to_ctx(struct iommu_fwspec *fwspec, unsigned asid)
{
struct qcom_iommu_dev *qcom_iommu = to_iommu(fwspec);
if (!qcom_iommu)
return NULL;
return qcom_iommu->ctxs[asid - 1];
}
static inline void
iommu_writel(struct qcom_iommu_ctx *ctx, unsigned reg, u32 val)
{
writel_relaxed(val, ctx->base + reg);
}
static inline void
iommu_writeq(struct qcom_iommu_ctx *ctx, unsigned reg, u64 val)
{
writeq_relaxed(val, ctx->base + reg);
}
static inline u32
iommu_readl(struct qcom_iommu_ctx *ctx, unsigned reg)
{
return readl_relaxed(ctx->base + reg);
}
static inline u64
iommu_readq(struct qcom_iommu_ctx *ctx, unsigned reg)
{
return readq_relaxed(ctx->base + reg);
}
static void qcom_iommu_tlb_sync(void *cookie)
{
struct iommu_fwspec *fwspec = cookie;
unsigned i;
for (i = 0; i < fwspec->num_ids; i++) {
struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
unsigned int val, ret;
iommu_writel(ctx, ARM_SMMU_CB_TLBSYNC, 0);
ret = readl_poll_timeout(ctx->base + ARM_SMMU_CB_TLBSTATUS, val,
(val & 0x1) == 0, 0, 5000000);
if (ret)
dev_err(ctx->dev, "timeout waiting for TLB SYNC\n");
}
}
static void qcom_iommu_tlb_inv_context(void *cookie)
{
struct iommu_fwspec *fwspec = cookie;
unsigned i;
for (i = 0; i < fwspec->num_ids; i++) {
struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
iommu_writel(ctx, ARM_SMMU_CB_S1_TLBIASID, ctx->asid);
}
qcom_iommu_tlb_sync(cookie);
}
static void qcom_iommu_tlb_inv_range_nosync(unsigned long iova, size_t size,
size_t granule, bool leaf, void *cookie)
{
struct iommu_fwspec *fwspec = cookie;
unsigned i