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kernel/drivers/iommu/mtk_iommu.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2016 MediaTek Inc.
* Author: Yong Wu <yong.wu@mediatek.com>
*/
#include <linux/bitfield.h>
#include <linux/bug.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/device.h>
#include <linux/dma-direct.h>
#include <linux/dma-iommu.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/soc/mediatek/infracfg.h>
#include <asm/barrier.h>
#include <soc/mediatek/smi.h>
#include "mtk_iommu.h"
#define REG_MMU_PT_BASE_ADDR 0x000
#define MMU_PT_ADDR_MASK GENMASK(31, 7)
#define REG_MMU_INVALIDATE 0x020
#define F_ALL_INVLD 0x2
#define F_MMU_INV_RANGE 0x1
#define REG_MMU_INVLD_START_A 0x024
#define REG_MMU_INVLD_END_A 0x028
#define REG_MMU_INV_SEL_GEN2 0x02c
#define REG_MMU_INV_SEL_GEN1 0x038
#define F_INVLD_EN0 BIT(0)
#define F_INVLD_EN1 BIT(1)
#define REG_MMU_MISC_CTRL 0x048
#define F_MMU_IN_ORDER_WR_EN_MASK (BIT(1) | BIT(17))
#define F_MMU_STANDARD_AXI_MODE_MASK (BIT(3) | BIT(19))
#define REG_MMU_DCM_DIS 0x050
#define REG_MMU_WR_LEN_CTRL 0x054
#define F_MMU_WR_THROT_DIS_MASK (BIT(5) | BIT(21))
#define REG_MMU_CTRL_REG 0x110
#define F_MMU_TF_PROT_TO_PROGRAM_ADDR (2 << 4)
#define F_MMU_PREFETCH_RT_REPLACE_MOD BIT(4)
#define F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173 (2 << 5)
#define REG_MMU_IVRP_PADDR 0x114
#define REG_MMU_VLD_PA_RNG 0x118
#define F_MMU_VLD_PA_RNG(EA, SA) (((EA) << 8) | (SA))
#define REG_MMU_INT_CONTROL0 0x120
#define F_L2_MULIT_HIT_EN BIT(0)
#define F_TABLE_WALK_FAULT_INT_EN BIT(1)
#define F_PREETCH_FIFO_OVERFLOW_INT_EN BIT(2)
#define F_MISS_FIFO_OVERFLOW_INT_EN BIT(3)
#define F_PREFETCH_FIFO_ERR_INT_EN BIT(5)
#define F_MISS_FIFO_ERR_INT_EN BIT(6)
#define F_INT_CLR_BIT BIT(12)
#define REG_MMU_INT_MAIN_CONTROL 0x124
/* mmu0 | mmu1 */
#define F_INT_TRANSLATION_FAULT (BIT(0) | BIT(7))
#define F_INT_MAIN_MULTI_HIT_FAULT (BIT(1) | BIT(8))
#define F_INT_INVALID_PA_FAULT (BIT(2) | BIT(9))
#define F_INT_ENTRY_REPLACEMENT_FAULT (BIT(3) | BIT(10))
#define F_INT_TLB_MISS_FAULT (BIT(4) | BIT(11))
#define F_INT_MISS_TRANSACTION_FIFO_FAULT (BIT(5) | BIT(12))
#define F_INT_PRETETCH_TRANSATION_FIFO_FAULT (BIT(6) | BIT(13))
#define REG_MMU_CPE_DONE 0x12C
#define REG_MMU_FAULT_ST1 0x134
#define F_REG_MMU0_FAULT_MASK GENMASK(6, 0)
#define F_REG_MMU1_FAULT_MASK GENMASK(13, 7)
#define REG_MMU0_FAULT_VA 0x13c
#define F_MMU_INVAL_VA_31_12_MASK GENMASK(31, 12)
#define F_MMU_INVAL_VA_34_32_MASK GENMASK(11, 9)
#define F_MMU_INVAL_PA_34_32_MASK GENMASK(8, 6)
#define F_MMU_FAULT_VA_WRITE_BIT BIT(1)
#define F_MMU_FAULT_VA_LAYER_BIT BIT(0)
#define REG_MMU0_INVLD_PA 0x140
#define REG_MMU1_FAULT_VA 0x144
#define REG_MMU1_INVLD_PA 0x148
#define REG_MMU0_INT_ID 0x150
#define REG_MMU1_INT_ID 0x154
#define F_MMU_INT_ID_COMM_ID(a) (((a) >> 9) & 0x7)
#define F_MMU_INT_ID_SUB_COMM_ID(a) (((a) >> 7) & 0x3)
#define F_MMU_INT_ID_LARB_ID(a) (((a) >> 7) & 0x7)
#define F_MMU_INT_ID_PORT_ID(a) (((a) >> 2) & 0x1f)
#define MTK_PROTECT_PA_ALIGN 256
#define HAS_4GB_MODE BIT(0)
/* HW will use the EMI clock if there isn't the "bclk". */
#define HAS_BCLK BIT(1)
#define HAS_VLD_PA_RNG BIT(2)
#define RESET_AXI BIT(3)
#define OUT_ORDER_WR_EN BIT(4)
#define HAS_SUB_COMM BIT(5)
#define WR_THROT_EN BIT(6)
#define HAS_LEGACY_IVRP_PADDR BIT(7)
#define IOVA_34_EN BIT(8)
#define MTK_IOMMU_HAS_FLAG(pdata, _x) \
((((pdata)->flags) & (_x)) == (_x))
struct mtk_iommu_domain {
struct io_pgtable_cfg cfg;
struct io_pgtable_ops *iop;
struct mtk_iommu_data *data;
struct iommu_domain domain;
};
static const struct iommu_ops mtk_iommu_ops;
static int mtk_iommu_hw_init(const struct mtk_iommu_data *data);
#define MTK_IOMMU_TLB_ADDR(iova) ({ \
dma_addr_t _addr = iova; \
((lower_32_bits(_addr) & GENMASK(31, 12)) | upper_32_bits(_addr));\
})
/*
* In M4U 4GB mode, the physical address is remapped as below:
*
* CPU Physical address:
* ====================
*
* 0 1G 2G 3G 4G 5G
* |---A---|---B---|---C---|---D---|---E---|
* +--I/O--+------------Memory-------------+
*
* IOMMU output physical address:
* =============================
*
* 4G 5G 6G 7G 8G
* |---E---|---B---|---C---|---D---|
* +------------Memory-------------+
*
* The Region 'A'(I/O) can NOT be mapped by M4U; For Region 'B'/'C'/'D', the
* bit32 of the CPU physical address always is needed to set, and for Region
* 'E', the CPU physical address keep as is.
* Additionally, The iommu consumers always use the CPU phyiscal address.
*/
#define MTK_IOMMU_4GB_MODE_REMAP_BASE 0x140000000UL
static LIST_HEAD(m4ulist); /* List all the M4U HWs */
#define for_each_m4u(data) list_for_each_entry(data, &m4ulist, list)
struct mtk_iommu_iova_region {
dma_addr_t iova_base;
unsigned long long size;
};
static const struct mtk_iommu_iova_region single_domain[] = {
{.iova_base = 0, .size = SZ_4G},
};
static const struct mtk_iommu_iova_region mt8192_multi_dom[] = {
{ .iova_base = 0x0, .size = SZ_4G}, /* disp: 0 ~ 4G */
#if IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT)
{ .iova_base = SZ_4G, .size = SZ_4G}, /* vdec: 4G ~ 8G */
{ .iova_base = SZ_4G * 2, .size = SZ_4G}, /* CAM/MDP: 8G ~ 12G */
{ .iova_base = 0x240000000ULL, .size = 0x4000000}, /* CCU0 */
{ .iova_base = 0x244000000ULL, .size = 0x4000000}, /* CCU1 */
#endif
};
/*
* There may be 1 or 2 M4U HWs, But we always expect they are in the same domain
* for the performance.
*
* Here always return the mtk_iommu_data of the first probed M4U where the
* iommu domain information is recorded.
*/
static struct mtk_iommu_data *mtk_iommu_get_m4u_data(void)
{
struct mtk_iommu_data *data;
for_each_m4u(data)
return data;
return NULL;
}
static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
{
return container_of(dom, struct mtk_iommu_domain, domain);
}
static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
{
for_each_m4u(data) {
if (pm_runtime_get_if_in_use(data->dev) <= 0)
continue;
writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
data->base + data->plat_data->inv_sel_reg);
writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
wmb(); /* Make sure the tlb flush all done */
pm_runtime_put(data->dev);
}
}
static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
size_t granule,
struct mtk_iommu_data *data)
{
bool has_pm = !!data->dev->pm_domain;
unsigned long flags;
int ret;
u32 tmp;
for_each_m4u(data) {
if (has_pm) {
if (pm_runtime_get_if_in_use(data->dev) <= 0)
continue;
}
spin_lock_irqsave(&data->tlb_lock, flags);
writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
data->base + data->plat_data->inv_sel_reg);
writel_relaxed(MTK_IOMMU_TLB_ADDR(iova),
data->base + REG_MMU_INVLD_START_A);
writel_relaxed(MTK_IOMMU_TLB_ADDR(iova + size - 1),
data->base + REG_MMU_INVLD_END_A);
writel_relaxed(F_MMU_INV_RANGE,
data->base + REG_MMU_INVALIDATE);
/* tlb sync */
ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
tmp, tmp != 0, 10, 1000);
if (ret) {
dev_warn(data->dev,
"Partial TLB flush timed out, falling back to full flush\n");
mtk_iommu_tlb_flush_all(data);
}
/* Clear the CPE status */
writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
spin_unlock_irqrestore(&data->tlb_lock, flags);
if (has_pm)
pm_runtime_put(data->dev);
}
}
static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
{
struct mtk_iommu_data *data = dev_id;
struct mtk_iommu_domain *dom = data->m4u_dom;
unsigned int fault_larb, fault_port, sub_comm = 0;
u32 int_state, regval, va34_32, pa34_32;
u64 fault_iova, fault_pa;
bool layer, write;
/* Read error info from registers */
int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST1);
if (int_state & F_REG_MMU0_FAULT_MASK) {
regval = readl_relaxed(data->base + REG_MMU0_INT_ID);
fault_iova = readl_relaxed(data->base + REG_MMU0_FAULT_VA);
fault_pa = readl_relaxed(data->base + REG_MMU0_INVLD_PA);
} else {
regval = readl_relaxed(data->base + REG_MMU1_INT_ID);
fault_iova = readl_relaxed(data->base + REG_MMU1_FAULT_VA);
fault_pa = readl_relaxed(data->base + REG_MMU1_INVLD_PA);
}
layer = fault_iova & F_MMU_FAULT_VA_LAYER_BIT;
write = fault_iova & F_MMU_FAULT_VA_WRITE_BIT;
if (MTK_IOMMU_HAS_FLAG(data->plat_data, IOVA_34_EN)) {
va34_32 = FIELD_GET(F_MMU_INVAL_VA_34_32_MASK, fault_iova);
pa34_32 = FIELD_GET(F_MMU_INVAL_PA_34_32_MASK, fault_iova);
fault_iova = fault_iova & F_MMU_INVAL_VA_31_12_MASK;
fault_iova |= (u64)va34_32 << 32;
fault_pa |= (u64)pa34_32 << 32;
}
fault_port = F_MMU_INT_ID_PORT_ID(regval);
if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_SUB_COMM)) {
fault_larb = F_MMU_INT_ID_COMM_ID(regval);
sub_comm = F_MMU_INT_ID_SUB_COMM_ID(regval);
} else {
fault_larb = F_MMU_INT_ID_LARB_ID(regval);
}
fault_larb = data->plat_data->larbid_remap[fault_larb][sub_comm];
if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) {
dev_err_ratelimited(
data->dev,
"fault type=0x%x iova=0x%llx pa=0x%llx larb=%d port=%d layer=%d %s\n",
int_state, fault_iova, fault_pa, fault_larb, fault_port,
layer, write ? "write" : "read");
}
/* Interrupt clear */
regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL0);
regval |= F_INT_CLR_BIT;
writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL0);
mtk_iommu_tlb_flush_all(data);
return IRQ_HANDLED;
}
static int mtk_iommu_get_domain_id(struct device *dev,
const struct mtk_iommu_plat_data *plat_data)
{
const struct mtk_iommu_iova_region *rgn = plat_data->iova_region;
const struct bus_dma_region *dma_rgn = dev->dma_range_map;
int i, candidate = -1;
dma_addr_t dma_end;
if (!dma_rgn || plat_data->iova_region_nr == 1)
return 0;
dma_end = dma_rgn->dma_start + dma_rgn->size - 1;
for (i = 0; i < plat_data->iova_region_nr; i++, rgn++) {
/* Best fit. */
if (dma_rgn->dma_start == rgn->iova_base &&
dma_end == rgn->iova_base + rgn->size - 1)
return i;
/* ok if it is inside this region. */
if (dma_rgn->dma_start >= rgn->iova_base &&
dma_end < rgn->iova_base + rgn->size)
candidate = i;
}
if (candidate >= 0)
return candidate;
dev_err(dev, "Can NOT find the iommu domain id(%pad 0x%llx).\n",
&dma_rgn->dma_start, dma_rgn->size);
return -EINVAL;
}
static void mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
bool enable, unsigned int domid)
{
struct mtk_smi_larb_iommu *larb_mmu;
unsigned int larbid, portid;
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
const struct mtk_iommu_iova_region *region;
int i;
for (i = 0; i < fwspec->num_ids; ++i) {
larbid = MTK_M4U_TO_LARB(fwspec->ids[i]);
portid = MTK_M4U_TO_PORT(fwspec->ids[i]);
larb_mmu = &data->larb_imu[larbid];
region = data->plat_data->iova_region + domid;
larb_mmu->bank[portid] = upper_32_bits(region->iova_base);
dev_dbg(dev, "%s iommu for larb(%s) port %d dom %d bank %d.\n",
enable ? "enable" : "disable", dev_name(larb_mmu->dev),
portid, domid, larb_mmu->bank[portid]);
if (enable)
larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
else
larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
}
}
static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
struct mtk_iommu_data *data,
unsigned int domid)
{
const struct mtk_iommu_iova_region *region;
/* Use the exist domain as there is only one pgtable here. */
if (data->m4u_dom) {
dom->iop = data->m4u_dom->iop;
dom->cfg = data->m4u_dom->cfg;
dom->domain.pgsize_bitmap = data->m4u_dom->cfg.pgsize_bitmap;
goto update_iova_region;
}
dom->cfg = (struct io_pgtable_cfg) {
.quirks = IO_PGTABLE_QUIRK_ARM_NS |
IO_PGTABLE_QUIRK_NO_PERMS |
IO_PGTABLE_QUIRK_ARM_MTK_EXT,
.pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap,
.ias = MTK_IOMMU_HAS_FLAG(data->plat_data, IOVA_34_EN) ? 34 : 32,
.iommu_dev = data->dev,
};
if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE))
dom->cfg.oas = data->enable_4GB ? 33 : 32;
else
dom->cfg.oas = 35;
dom->iop = alloc_io_pgtable_ops(ARM_V7S, &dom->cfg, data);
if (!dom->iop) {
dev_err(data->dev, "Failed to alloc io pgtable\n");
return -ENOMEM;
}
/* Update our support page sizes bitmap */
dom->domain.pgsize_bitmap = dom->cfg.pgsize_bitmap;
update_iova_region:
/* Update the iova region for this domain */
region = data->plat_data->iova_region + domid;
dom->domain.geometry.aperture_start = region->iova_base;
dom->domain.geometry.aperture_end = region->iova_base + region->size - 1;
dom->domain.geometry.force_aperture = true;
return 0;
}
static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
{
struct mtk_iommu_domain *dom;
if (type != IOMMU_DOMAIN_DMA)
return NULL;
dom = kzalloc(sizeof(*dom), GFP_KERNEL);
if (!dom)
return NULL;
if (iommu_get_dma_cookie(&dom->domain)) {
kfree(dom);
return NULL;
}
return &dom->domain;
}
static void mtk_iommu_domain_free(struct iommu_domain *domain)
{
iommu_put_dma_cookie(domain);
kfree(to_mtk_domain(domain));
}
static int mtk_iommu_attach_device(struct iommu_domain *domain,
struct device *dev)
{
struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
struct device *m4udev = data->dev;
int ret, domid;
domid = mtk_iommu_get_domain_id(dev, data->plat_data);
if (domid < 0)
return domid;
if (!dom->data) {
if (mtk_iommu_domain_finalise(dom, data, domid))
return ret;
dom->data = data;
}
if (!data->m4u_dom) { /* Initialize the M4U HW */
ret = pm_runtime_resume_and_get(m4udev);
if (ret < 0)
return ret;
ret = mtk_iommu_hw_init(data);
if (ret) {
pm_runtime_put(m4udev);
return ret;
}
data->m4u_dom = dom;
writel(dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK,
data->base + REG_MMU_PT_BASE_ADDR);
pm_runtime_put(m4udev);
}
mtk_iommu_config(data, dev, true, domid);
return 0;
}
static void mtk_iommu_detach_device(struct iommu_domain *domain,
struct device *dev)
{
struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
mtk_iommu_config(data, dev, false, 0);
}
static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
/* The "4GB mode" M4U physically can not use the lower remap of Dram. */
if (dom->data->enable_4GB)
paddr |= BIT_ULL(32);
/* Synchronize with the tlb_lock */
return dom->iop->map(dom->iop, iova, paddr, size, prot, gfp);
}
static size_t mtk_iommu_unmap(struct iommu_domain *domain,
unsigned long iova, size_t size,
struct iommu_iotlb_gather *gather)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
iommu_iotlb_gather_add_range(gather, iova, size);
return dom->iop->unmap(dom->iop, iova, size, gather);
}
static void mtk_iommu_flush_iotlb_all(struct iommu_domain *domain)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
mtk_iommu_tlb_flush_all(dom->data);
}
static void mtk_iommu_iotlb_sync(struct iommu_domain *domain,
struct iommu_iotlb_gather *gather)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
size_t length = gather->end - gather->start + 1;
mtk_iommu_tlb_flush_range_sync(gather->start, length, gather->pgsize,
dom->data);
}
static void mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
size_t size)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
mtk_iommu_tlb_flush_range_sync(iova, size, size, dom->data);
}
static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t iova)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
phys_addr_t pa;
pa = dom->iop->iova_to_phys(dom->iop, iova);
if (dom->data->enable_4GB && pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE)
pa &= ~BIT_ULL(32);
return pa;
}
static struct iommu_device *mtk_iommu_probe_device(struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct mtk_iommu_data *data;
if (!fwspec || fwspec->ops != &mtk_iommu_ops)
return ERR_PTR(-ENODEV); /* Not a iommu client device */
data = dev_iommu_priv_get(dev);
return &data->iommu;
}
static void mtk_iommu_release_device(struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
if (!fwspec || fwspec->ops != &mtk_iommu_ops)
return;
iommu_fwspec_free(dev);
}
static struct iommu_group *mtk_iommu_device_group(struct device *dev)
{
struct mtk_iommu_data *data = mtk_iommu_get_m4u_data();
struct iommu_group *group;
int domid;
if (!data)
return ERR_PTR(-ENODEV);
domid = mtk_iommu_get_domain_id(dev, data->plat_data);
if (domid < 0)
return ERR_PTR(domid);
group = data->m4u_group[domid];
if (!group) {
group = iommu_group_alloc();
if (!IS_ERR(group))
data->m4u_group[domid] = group;
} else {
iommu_group_ref_get(group);
}
return group;
}
static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
{
struct platform_device *m4updev;
if (args->args_count != 1) {
dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
args->args_count);
return -EINVAL;
}
if (!dev_iommu_priv_get(dev)) {
/* Get the m4u device */
m4updev = of_find_device_by_node(args->np);
if (WARN_ON(!m4updev))
return -EINVAL;
dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
}
return iommu_fwspec_add_ids(dev, args->args, 1);
}
static void mtk_iommu_get_resv_regions(struct device *dev,
struct list_head *head)
{
struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
unsigned int domid = mtk_iommu_get_domain_id(dev, data->plat_data), i;
const struct mtk_iommu_iova_region *resv, *curdom;
struct iommu_resv_region *region;
int prot = IOMMU_WRITE | IOMMU_READ;
if ((int)domid < 0)
return;
curdom = data->plat_data->iova_region + domid;
for (i = 0; i < data->plat_data->iova_region_nr; i++) {
resv = data->plat_data->iova_region + i;
/* Only reserve when the region is inside the current domain */
if (resv->iova_base <= curdom->iova_base ||
resv->iova_base + resv->size >= curdom->iova_base + curdom->size)
continue;
region = iommu_alloc_resv_region(resv->iova_base, resv->size,
prot, IOMMU_RESV_RESERVED);
if (!region)
return;
list_add_tail(&region->list, head);
}
}
static const struct iommu_ops mtk_iommu_ops = {
.domain_alloc = mtk_iommu_domain_alloc,
.probe_device = mtk_iommu_probe_device,
.release_device = mtk_iommu_release_device,
.device_group = mtk_iommu_device_group,
.of_xlate = mtk_iommu_of_xlate,
.get_resv_regions = mtk_iommu_get_resv_regions,
.put_resv_regions = generic_iommu_put_resv_regions,
.pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
.owner = THIS_MODULE,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = mtk_iommu_attach_device,
.detach_dev = mtk_iommu_detach_device,
.map = mtk_iommu_map,
.unmap = mtk_iommu_unmap,
.flush_iotlb_all = mtk_iommu_flush_iotlb_all,
.iotlb_sync = mtk_iommu_iotlb_sync,
.iotlb_sync_map = mtk_iommu_sync_map,
.iova_to_phys = mtk_iommu_iova_to_phys,
.free = mtk_iommu_domain_free,
}
};
static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
{
u32 regval;
if (data->plat_data->m4u_plat == M4U_MT8173) {
regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
} else {
regval = readl_relaxed(data->base + REG_MMU_CTRL_REG);
regval |= F_MMU_TF_PROT_TO_PROGRAM_ADDR;
}
writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
regval = F_L2_MULIT_HIT_EN |
F_TABLE_WALK_FAULT_INT_EN |
F_PREETCH_FIFO_OVERFLOW_INT_EN |
F_MISS_FIFO_OVERFLOW_INT_EN |
F_PREFETCH_FIFO_ERR_INT_EN |
F_MISS_FIFO_ERR_INT_EN;
writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL0);
regval = F_INT_TRANSLATION_FAULT |
F_INT_MAIN_MULTI_HIT_FAULT |
F_INT_INVALID_PA_FAULT |
F_INT_ENTRY_REPLACEMENT_FAULT |
F_INT_TLB_MISS_FAULT |
F_INT_MISS_TRANSACTION_FIFO_FAULT |
F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);
if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_LEGACY_IVRP_PADDR))
regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
else
regval = lower_32_bits(data->protect_base) |
upper_32_bits(data->protect_base);
writel_relaxed(regval, data->base + REG_MMU_IVRP_PADDR);
if (data->enable_4GB &&
MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_VLD_PA_RNG)) {
/*
* If 4GB mode is enabled, the validate PA range is from
* 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30].
*/
regval = F_MMU_VLD_PA_RNG(7, 4);
writel_relaxed(regval, data->base + REG_MMU_VLD_PA_RNG);
}
writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
if (MTK_IOMMU_HAS_FLAG(data->plat_data, WR_THROT_EN)) {
/* write command throttling mode */
regval = readl_relaxed(data->base + REG_MMU_WR_LEN_CTRL);
regval &= ~F_MMU_WR_THROT_DIS_MASK;
writel_relaxed(regval, data->base + REG_MMU_WR_LEN_CTRL);
}
if (MTK_IOMMU_HAS_FLAG(data->plat_data, RESET_AXI)) {
/* The register is called STANDARD_AXI_MODE in this case */
regval = 0;
} else {
regval = readl_relaxed(data->base + REG_MMU_MISC_CTRL);
regval &= ~F_MMU_STANDARD_AXI_MODE_MASK;
if (MTK_IOMMU_HAS_FLAG(data->plat_data, OUT_ORDER_WR_EN))
regval &= ~F_MMU_IN_ORDER_WR_EN_MASK;
}
writel_relaxed(regval, data->base + REG_MMU_MISC_CTRL);
if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
dev_name(data->dev), (void *)data)) {
writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR);
dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq);
return -ENODEV;
}
return 0;
}
static const struct component_master_ops mtk_iommu_com_ops = {
.bind = mtk_iommu_bind,
.unbind = mtk_iommu_unbind,
};
static int mtk_iommu_probe(struct platform_device *pdev)
{
struct mtk_iommu_data *data;
struct device *dev = &pdev->dev;
struct device_node *larbnode, *smicomm_node;
struct platform_device *plarbdev;
struct device_link *link;
struct resource *res;
resource_size_t ioaddr;
struct component_match *match = NULL;
struct regmap *infracfg;
void *protect;
int i, larb_nr, ret;
u32 val;
char *p;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->dev = dev;
data->plat_data = of_device_get_match_data(dev);
/* Protect memory. HW will access here while translation fault.*/
protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL);
if (!protect)
return -ENOMEM;
data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE)) {
switch (data->plat_data->m4u_plat) {
case M4U_MT2712:
p = "mediatek,mt2712-infracfg";
break;
case M4U_MT8173:
p = "mediatek,mt8173-infracfg";
break;
default:
p = NULL;
}
infracfg = syscon_regmap_lookup_by_compatible(p);
if (IS_ERR(infracfg))
return PTR_ERR(infracfg);
ret = regmap_read(infracfg, REG_INFRA_MISC, &val);
if (ret)
return ret;
data->enable_4GB = !!(val & F_DDR_4GB_SUPPORT_EN);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->base = devm_ioremap_resource(dev, res);
if (IS_ERR(data->base))
return PTR_ERR(data->base);
ioaddr = res->start;
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
return data->irq;
if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_BCLK)) {
data->bclk = devm_clk_get(dev, "bclk");
if (IS_ERR(data->bclk))
return PTR_ERR(data->bclk);
}
larb_nr = of_count_phandle_with_args(dev->of_node,
"mediatek,larbs", NULL);
if (larb_nr < 0)
return larb_nr;
for (i = 0; i < larb_nr; i++) {
u32 id;
larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);
if (!larbnode)
return -EINVAL;
if (!of_device_is_available(larbnode)) {
of_node_put(larbnode);
continue;
}
ret = of_property_read_u32(larbnode, "mediatek,larb-id", &id);
if (ret)/* The id is consecutive if there is no this property */
id = i;
plarbdev = of_find_device_by_node(larbnode);
if (!plarbdev) {
of_node_put(larbnode);
return -EPROBE_DEFER;
}
data->larb_imu[id].dev = &plarbdev->dev;
component_match_add_release(dev, &match, release_of,
compare_of, larbnode);
}
/* Get smi-common dev from the last larb. */
smicomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0);
if (!smicomm_node)
return -EINVAL;
plarbdev = of_find_device_by_node(smicomm_node);
of_node_put(smicomm_node);
data->smicomm_dev = &plarbdev->dev;
pm_runtime_enable(dev);
link = device_link_add(data->smicomm_dev, dev,
DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME);
if (!link) {
dev_err(dev, "Unable to link %s.\n", dev_name(data->smicomm_dev));
ret = -EINVAL;
goto out_runtime_disable;
}
platform_set_drvdata(pdev, data);
ret = iommu_device_sysfs_add(&data->iommu, dev, NULL,
"mtk-iommu.%pa", &ioaddr);
if (ret)
goto out_link_remove;
ret = iommu_device_register(&data->iommu, &mtk_iommu_ops, dev);
if (ret)
goto out_sysfs_remove;
spin_lock_init(&data->tlb_lock);
list_add_tail(&data->list, &m4ulist);
if (!iommu_present(&platform_bus_type)) {
ret = bus_set_iommu(&platform_bus_type, &mtk_iommu_ops);
if (ret)
goto out_list_del;
}
ret = component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
if (ret)
goto out_bus_set_null;
return ret;
out_bus_set_null:
bus_set_iommu(&platform_bus_type, NULL);
out_list_del:
list_del(&data->list);
iommu_device_unregister(&data->iommu);
out_sysfs_remove:
iommu_device_sysfs_remove(&data->iommu);
out_link_remove:
device_link_remove(data->smicomm_dev, dev);
out_runtime_disable:
pm_runtime_disable(dev);
return ret;
}
static int mtk_iommu_remove(struct platform_device *pdev)
{
struct mtk_iommu_data *data = platform_get_drvdata(pdev);
iommu_device_sysfs_remove(&data->iommu);
iommu_device_unregister(&data->iommu);
if (iommu_present(&platform_bus_type))
bus_set_iommu(&platform_bus_type, NULL);
clk_disable_unprepare(data->bclk);
device_link_remove(data->smicomm_dev, &pdev->dev);
pm_runtime_disable(&pdev->dev);
devm_free_irq(&pdev->dev, data->irq, data);
component_master_del(&pdev->dev, &mtk_iommu_com_ops);
return 0;
}
static int __maybe_unused mtk_iommu_runtime_suspend(struct device *dev)
{
struct mtk_iommu_data *data = dev_get_drvdata(dev);
struct mtk_iommu_suspend_reg *reg = &data->reg;
void __iomem *base = data->base;
reg->wr_len_ctrl = readl_relaxed(base + REG_MMU_WR_LEN_CTRL);
reg->misc_ctrl = readl_relaxed(base + REG_MMU_MISC_CTRL);
reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS);
reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0);
reg->int_main_control = readl_relaxed(base + REG_MMU_INT_MAIN_CONTROL);
reg->ivrp_paddr = readl_relaxed(base + REG_MMU_IVRP_PADDR);
reg->vld_pa_rng = readl_relaxed(base + REG_MMU_VLD_PA_RNG);
clk_disable_unprepare(data->bclk);
return 0;
}
static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev)
{
struct mtk_iommu_data *data = dev_get_drvdata(dev);
struct mtk_iommu_suspend_reg *reg = &data->reg;
struct mtk_iommu_domain *m4u_dom = data->m4u_dom;
void __iomem *base = data->base;
int ret;
ret = clk_prepare_enable(data->bclk);
if (ret) {
dev_err(data->dev, "Failed to enable clk(%d) in resume\n", ret);
return ret;
}
/*
* Uppon first resume, only enable the clk and return, since the values of the
* registers are not yet set.
*/
if (!m4u_dom)
return 0;
writel_relaxed(reg->wr_len_ctrl, base + REG_MMU_WR_LEN_CTRL);
writel_relaxed(reg->misc_ctrl, base + REG_MMU_MISC_CTRL);
writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS);
writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0);
writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR);
writel_relaxed(reg->vld_pa_rng, base + REG_MMU_VLD_PA_RNG);
writel(m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK, base + REG_MMU_PT_BASE_ADDR);
return 0;
}
static const struct dev_pm_ops mtk_iommu_pm_ops = {
SET_RUNTIME_PM_OPS(mtk_iommu_runtime_suspend, mtk_iommu_runtime_resume, NULL)
SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static const struct mtk_iommu_plat_data mt2712_data = {
.m4u_plat = M4U_MT2712,
.flags = HAS_4GB_MODE | HAS_BCLK | HAS_VLD_PA_RNG,
.inv_sel_reg = REG_MMU_INV_SEL_GEN1,
.iova_region = single_domain,
.iova_region_nr = ARRAY_SIZE(single_domain),
.larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}},
};
static const struct mtk_iommu_plat_data mt6779_data = {
.m4u_plat = M4U_MT6779,
.flags = HAS_SUB_COMM | OUT_ORDER_WR_EN | WR_THROT_EN,
.inv_sel_reg = REG_MMU_INV_SEL_GEN2,
.iova_region = single_domain,
.iova_region_nr = ARRAY_SIZE(single_domain),
.larbid_remap = {{0}, {1}, {2}, {3}, {5}, {7, 8}, {10}, {9}},
};
static const struct mtk_iommu_plat_data mt8167_data = {
.m4u_plat = M4U_MT8167,
.flags = RESET_AXI | HAS_LEGACY_IVRP_PADDR,
.inv_sel_reg = REG_MMU_INV_SEL_GEN1,
.iova_region = single_domain,
.iova_region_nr = ARRAY_SIZE(single_domain),
.larbid_remap = {{0}, {1}, {2}}, /* Linear mapping. */
};
static const struct mtk_iommu_plat_data mt8173_data = {
.m4u_plat = M4U_MT8173,
.flags = HAS_4GB_MODE | HAS_BCLK | RESET_AXI |
HAS_LEGACY_IVRP_PADDR,
.inv_sel_reg = REG_MMU_INV_SEL_GEN1,
.iova_region = single_domain,
.iova_region_nr = ARRAY_SIZE(single_domain),
.larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}}, /* Linear mapping. */
};
static const struct mtk_iommu_plat_data mt8183_data = {
.m4u_plat = M4U_MT8183,
.flags = RESET_AXI,
.inv_sel_reg = REG_MMU_INV_SEL_GEN1,
.iova_region = single_domain,
.iova_region_nr = ARRAY_SIZE(single_domain),
.larbid_remap = {{0}, {4}, {5}, {6}, {7}, {2}, {3}, {1}},
};
static const struct mtk_iommu_plat_data mt8192_data = {
.m4u_plat = M4U_MT8192,
.flags = HAS_BCLK | HAS_SUB_COMM | OUT_ORDER_WR_EN |
WR_THROT_EN | IOVA_34_EN,
.inv_sel_reg = REG_MMU_INV_SEL_GEN2,
.iova_region = mt8192_multi_dom,
.iova_region_nr = ARRAY_SIZE(mt8192_multi_dom),
.larbid_remap = {{0}, {1}, {4, 5}, {7}, {2}, {9, 11, 19, 20},
{0, 14, 16}, {0, 13, 18, 17}},
};
static const struct of_device_id mtk_iommu_of_ids[] = {
{ .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
{ .compatible = "mediatek,mt6779-m4u", .data = &mt6779_data},
{ .compatible = "mediatek,mt8167-m4u", .data = &mt8167_data},
{ .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
{ .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data},
{ .compatible = "mediatek,mt8192-m4u", .data = &mt8192_data},
{}
};
static struct platform_driver mtk_iommu_driver = {
.probe = mtk_iommu_probe,
.remove = mtk_iommu_remove,
.driver = {
.name = "mtk-iommu",
.of_match_table = mtk_iommu_of_ids,
.pm = &mtk_iommu_pm_ops,
}
};
module_platform_driver(mtk_iommu_driver);
MODULE_DESCRIPTION("IOMMU API for MediaTek M4U implementations");
MODULE_LICENSE("GPL v2");
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