- 根目录:
- drivers
- iommu
- msm_iommu.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 <asm/cacheflush.h>
#include <asm/sizes.h>
#include <mach/iommu_hw-8xxx.h>
#include <mach/iommu.h>
#define MRC(reg, processor, op1, crn, crm, op2) \
__asm__ __volatile__ ( \
" mrc " #processor "," #op1 ", %0," #crn "," #crm "," #op2 "\n" \
: "=r" (reg))
#define RCP15_PRRR(reg) MRC(reg, p15, 0, c10, c2, 0)
#define RCP15_NMRR(reg) MRC(reg, p15, 0, c10, c2, 1)
/* bitmap of the page sizes currently supported */
#define MSM_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M)
static int msm_iommu_tex_class[4];
DEFINE_SPINLOCK(msm_iommu_lock);
struct msm_priv {
unsigned long *pgtable;
struct list_head list_attached;
};
static int __enable_clocks(struct msm_iommu_drvdata *drvdata)
{
int ret;
ret = clk_enable(drvdata->pclk);
if (ret)
goto fail;
if (drvdata->clk) {
ret = clk_enable(drvdata->clk);
if (ret)
clk_disable(drvdata->pclk);
}
fail:
return ret;
}
static void __disable_clocks(struct msm_iommu_drvdata *drvdata)
{
if (drvdata->clk)
clk_disable(drvdata->clk);
clk_disable(drvdata->pclk);
}
static int __flush_iotlb(struct iommu_domain *domain)
{
struct msm_priv *priv = domain->priv;
struct msm_iommu_drvdata *iommu_drvdata;
struct msm_iommu_ctx_drvdata *ctx_drvdata;
int ret = 0;
#ifndef CONFIG_IOMMU_PGTABLES_L2
unsigned long *fl_table = priv->pgtable;
int i;
if (!list_empty(&priv->list_attached)) {
dmac_flush_range(fl_table, fl_table + SZ_16K);
for (i = 0; i < NUM_FL_PTE; i++)
if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) {
void *sl_table = __va(fl_table[i] &
FL_BASE_MASK);
dmac_flush_range(sl_table, sl_table + SZ_4K);
}
}
#endif
list_for_each_entry(ctx_drvdata, &priv->list_attached, attached_elm) {
if (!ctx_drvdata->pdev || !ctx_drvdata->pdev->dev.parent)
BUG();
iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent);
BUG_ON(!iommu_drvdata);
ret = __enable_clocks(iommu_drvdata);
if (ret)
goto fail;
SET_CTX_TLBIALL(iommu_drvdata->base, ctx_drvdata->num, 0);
__disable_clocks(iommu_drvdata);
}
fail:
return ret;
}
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);
SET_PRRR(base, ctx, 0);
SET_NMRR(base, ctx, 0);
}
static void __program_context(void __iomem *base, int ctx, phys_addr_t pgtable)
{
unsigned int prrr, nmrr;
__reset_context(base, ctx);
/* 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, 0);
SET_TTBR0_PA(base, ctx, (pgtable >> 14));
/* 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 TEX Remap */
SET_TRE(base, ctx, 1);
/* Set TEX remap attributes */
RCP15_PRRR(prrr);
RCP15_NMRR(nmrr);
SET_PRRR(base, ctx, prrr);
SET_NMRR(base, ctx, nmrr);
/* Turn on BFB prefetch */
SET_BFBDFE(base, ctx, 1);
#ifdef CONFIG_IOMMU_PGTABLES_L2
/* Configure page tables as inner-cacheable and shareable to reduce
* the TLB miss penalty.
*/
SET_TTBR0_SH(base, ctx, 1);
SET_TTBR1_SH(base, ctx, 1);
SET_TTBR0_NOS(base, ctx, 1);
SET_TTBR1_NOS(base, ctx, 1);
SET_TTBR0_IRGNH(base, ctx, 0); /* WB, WA */
SET_TTBR0_IRGNL(base, ctx, 1);
SET_TTBR1_IRGNH(base, ctx, 0); /* WB, WA */
SET_TTBR1_IRGNL(base, ctx, 1);
SET_TTBR0_ORGN(base, ctx, 1); /* WB, WA */
SET_TTBR1_ORGN(base, ctx, 1); /* WB, WA */
#endif
/* Enable the MMU */
SET_M(base, ctx, 1);
}
static int msm_iommu_domain_init(struct iommu_domain *domain)
{
struct msm_priv *priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
goto fail_nomem;
INIT_LIST_HEAD(&priv->list_attached);
priv->pgtable = (unsigned long *)__get_free_pages(GFP_KERNEL,
get_order(SZ_16K));
if (!priv->pgtable)
goto fail_nomem;
memset(priv->pgtable, 0, SZ_16K);
domain->priv = priv;
return 0;
fail_nomem:
kfree(priv);
return -ENOMEM;
}
static void msm_iommu_domain_destroy(struct iommu_domain *domain)
{
struct msm_priv *priv;
unsigned long flags;
unsigned long *fl_table;
int i;
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = domain->priv;
domain->priv = NULL;
if (priv) {
fl_table = priv->pgtable;
for (i = 0; i < NUM_FL_PTE; i++)
if ((fl_table[i] & 0x03) == FL_TYPE_TABLE)
free_page((unsigned long) __va(((fl_table[i]) &
FL_BASE_MASK)));
free_pages((unsigned long)priv->pgtable, get_order(SZ_16K));
priv->pgtable = NULL;
}
kfree(priv);
spin_unlock_irqrestore(&msm_iommu_lock, flags);
}
static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
struct msm_priv *priv;
struct msm_iommu_ctx_dev *ctx_dev;
struct msm_iommu_drvdata *iommu_drvdata;
struct msm_iommu_ctx_drvdata *ctx_drvdata;
struct msm_iommu_ctx_drvdata *tmp_drvdata;
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = domain->priv;
if (!priv || !dev) {
ret = -EINVAL;
goto fail;
}
iommu_drvdata = dev_get_drvdata(dev->parent);
ctx_drvdata = dev_get_drvdata(dev);
ctx_dev = dev->platform_data;
if (!iommu_drvdata || !ctx_drvdata || !ctx_dev) {
ret = -EINVAL;
goto fail;
}
if (!list_empty(&ctx_drvdata->attached_elm)) {
ret = -EBUSY;
goto fail;
}
list_for_each_entry(tmp_drvdata, &priv->list_attached, attached_elm)
if (tmp_drvdata == ctx_drvdata) {
ret = -EBUSY;
goto fail;
}
ret = __enable_clocks(iommu_drvdata);
if (ret)
goto fail;
__program_context(iommu_drvdata->base, ctx_dev->num,
__pa(priv->pgtable));
__disable_clocks(iommu_drvdata);
list_add(&(ctx_drvdata->attached_elm), &priv->list_attached);
ret = __flush_iotlb(domain);
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;
struct msm_iommu_ctx_dev *ctx_dev;
struct msm_iommu_drvdata *iommu_drvdata;
struct msm_iommu_ctx_drvdata *ctx_drvdata;
unsigned long flags;
int ret;
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = domain->priv;
if (!priv || !dev)
goto fail;
iommu_drvdata = dev_get_drvdata(dev->parent);
ctx_drvdata = dev_get_drvdata(dev);
ctx_dev = dev->platform_data;
if (!iommu_drvdata || !ctx_drvdata || !ctx_dev)
goto fail;
ret = __flush_iotlb(domain);
if (ret)
goto fail;
ret = __enable_clocks(iommu_drvdata);
if (ret)
goto fail;
__reset_context(iommu_drvdata->base, ctx_dev->num);
__disable_clocks(iommu_drvdata);
list_del_init(&ctx_drvdata->attached_elm);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
}
static int msm_iommu_map(struct iommu_domain *domain, unsigned long va,
phys_addr_t pa, size_t len, int prot)
{
struct msm_priv *priv;
unsigned long flags;
unsigned long *fl_table;
unsigned long *fl_pte;
unsigned long fl_offset;
unsigned long *sl_table;
unsigned long *sl_pte;
unsigned long sl_offset;
unsigned int pgprot;
int ret = 0, tex, sh;
spin_lock_irqsave(&msm_iommu_lock, flags);
sh = (prot & MSM_IOMMU_ATTR_SH) ? 1 : 0;
tex = msm_iommu_tex_class[prot & MSM_IOMMU_CP_MASK];
if (tex < 0 || tex > NUM_TEX_CLASS - 1) {
ret = -EINVAL;
goto fail;
}
priv = domain->priv;
if (!priv) {
ret = -EINVAL;
goto fail;
}
fl_table = priv->pgtable;
if (len != SZ_16M && len != SZ_1M &&
len != SZ_64K && len != SZ_4K) {
pr_debug("Bad size: %d\n", len);
ret = -EINVAL;
goto fail;
}
if (!fl_table) {
pr_debug("Null page table\n");
ret = -EINVAL;
goto fail;
}
if (len == SZ_16M || len == SZ_1M) {
pgprot = sh ? FL_SHARED : 0;
pgprot |= tex & 0x01 ? FL_BUFFERABLE : 0;
pgprot |= tex & 0x02 ? FL_CACHEABLE : 0;
pgprot |= tex & 0x04 ? FL_TEX0 : 0;
} else {
pgprot = sh ? SL_SHARED : 0;
pgprot |= tex & 0x01 ? SL_BUFFERABLE : 0;
pgprot |= tex & 0x02 ? SL_CACHEABLE : 0;
pgprot |= tex & 0x04 ? SL_TEX0 : 0;
}
fl_offset = FL_OFFSET(va); /* Upper 12 bits */
fl_pte = fl_table + fl_offset; /* int pointers, 4 bytes */
if (len == SZ_16M) {
int i = 0;
for (i = 0; i < 16; i++)
*(fl_pte+i) = (pa & 0xFF000000) | FL_SUPERSECTION |
FL_AP_READ | FL_AP_WRITE | FL_TYPE_SECT |
FL_SHARED | FL_NG | pgprot;
}
if (len == SZ_1M)
*fl_pte = (pa & 0xFFF00000) | FL_AP_READ | FL_AP_WRITE | FL_NG |
FL_TYPE_SECT | FL_SHARED | pgprot;
/* Need a 2nd level table */
if ((len == SZ_4K || len == SZ_64K) && (*fl_pte) == 0) {
unsigned long *sl;
sl = (unsigned long *) __get_free_pages(GFP_ATOMIC,
get_order(SZ_4K));
if (!sl) {
pr_debug("Could not allocate second level table\n");
ret = -ENOMEM;
goto fail;
}
memset(sl, 0, SZ_4K);
*fl_pte = ((((int)__pa(sl)) & FL_BASE_MASK) | FL_TYPE_TABLE);
}
sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK));
sl_offset = SL_OFFSET(va);
sl_pte = sl_table + sl_offset;
if (len == SZ_4K)
*sl_pte = (pa & SL_BASE_MASK_SMALL) | SL_AP0 | SL_AP1 | SL_NG |
SL_SHARED | SL_TYPE_SMALL | pgprot;
if (len == SZ_64K) {
int i;
for (i = 0; i < 16; i++)
*(sl_pte+i) = (pa & SL_BASE_MASK_LARGE) | SL_AP0 |
SL_NG | SL_AP1 | SL_SHARED | SL_TYPE_LARGE | pgprot;
}
ret = __flush_iotlb(domain);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
}
static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long va,
size_t len)
{
struct msm_priv *priv;
unsigned long flags;
unsigned long *fl_table;
unsigned long *fl_pte;
unsigned long fl_offset;
unsigned long *sl_table;
unsigned long *sl_pte;
unsigned long sl_offset;
int i, ret = 0;
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = domain->priv;
if (!priv)
goto fail;
fl_table = priv->pgtable;
if (len != SZ_16M && len != SZ_1M &&
len != SZ_64K && len != SZ_4K) {
pr_debug("Bad length: %d\n", len);
goto fail;
}
if (!fl_table) {
pr_debug("Null page table\n");
goto fail;
}
fl_offset = FL_OFFSET(va); /* Upper 12 bits */
fl_pte = fl_table + fl_offset; /* int pointers, 4 bytes */
if (*fl_pte == 0) {
pr_debug("First level PTE is 0\n");
goto fail;
}
/* Unmap supersection */
if (len == SZ_16M)
for (i = 0; i < 16; i++)
*(fl_pte+i) = 0;
if (len == SZ_1M)
*fl_pte = 0;
sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK));
sl_offset = SL_OFFSET(va);
sl_pte = sl_table + sl_offset;
if (len == SZ_64K) {
for (i = 0; i < 16; i++)
*(sl_pte+i) = 0;
}
if (len == SZ_4K)
*sl_pte = 0;
if (len == SZ_4K || len == SZ_64K) {
int used = 0;
for (i = 0; i < NUM_SL_PTE; i++)
if (sl_table[i])
used = 1;
if (!used) {
free_page((unsigned long)sl_table);
*fl_pte = 0;
}
}
ret = __flush_iotlb(domain);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
/* the IOMMU API requires us to return how many bytes were unmapped */
len = ret ? 0 : len;
return len;
}
static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
unsigned long va)
{
struct msm_priv *priv;
struct msm_iommu_drvdata *iommu_drvdata;
struct msm_iommu_ctx_drvdata *ctx_drvdata;
unsigned int par;
unsigned long flags;
void __iomem *base;
phys_addr_t ret = 0;
int ctx;
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = domain->priv;
if (list_empty(&priv->list_attached))
goto fail;
ctx_drvdata = list_entry(priv->list_attached.next,
struct msm_iommu_ctx_drvdata, attached_elm);
iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent);
base = iommu_drvdata->base;
ctx = ctx_drvdata->num;
ret = __enable_clocks(iommu_drvdata);
if (ret)
goto fail;
/* Invalidate context TLB */
SET_CTX_TLBIALL(base, ctx, 0);
SET_V2PPR(base, ctx, va & V2Pxx_VA);
par = GET_PAR(base, ctx);
/* We are dealing with a supersection */
if (GET_NOFAULT_SS(base, ctx))
ret = (par & 0xFF000000) | (va & 0x00FFFFFF);
else /* Upper 20 bits from PAR, lower 12 from VA */
ret = (par & 0xFFFFF000) | (va & 0x00000FFF);
if (GET_FAULT(base, ctx))
ret = 0;
__disable_clocks(iommu_drvdata);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
}
static int msm_iommu_domain_has_cap(struct iommu_domain *domain,
unsigned long cap)
{
return 0;
}
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));
pr_err("PRRR = %08x NMRR = %08x\n",
GET_PRRR(base, ctx), GET_NMRR(base, ctx));
}
irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
{
struct msm_iommu_drvdata *drvdata = dev_id;
void __iomem *base;
unsigned int fsr;
int i, ret;
spin_lock(&msm_iommu_lock);
if (!drvdata) {
pr_err("Invalid device ID in context interrupt handler\n");
goto fail;
}
base = drvdata->base;
pr_err("Unexpected IOMMU page fault!\n");
pr_err("base = %08x\n", (unsigned int) base);
ret = __enable_clocks(drvdata);
if (ret)
goto fail;
for (i = 0; i < drvdata->ncb; i++) {
fsr = GET_FSR(base, i);
if (fsr) {
pr_err("Fault occurred in context %d.\n", i);
pr_err("Interesting registers:\n");
print_ctx_regs(base, i);
SET_FSR(base, i, 0x4000000F);
}
}
__disable_clocks(drvdata);
fail:
spin_unlock(&msm_iommu_lock);
return 0;
}
static struct iommu_ops msm_iommu_ops = {
.domain_init = msm_iommu_domain_init,
.domain_destroy = msm_iommu_domain_destroy,
.attach_dev = msm_iommu_attach_dev,
.detach_dev = msm_iommu_detach_dev,
.map = msm_iommu_map,
.unmap = msm_iommu_unmap,
.iova_to_phys = msm_iommu_iova_to_phys,
.domain_has_cap = msm_iommu_domain_has_cap,
.pgsize_bitmap = MSM_IOMMU_PGSIZES,
};
static int __init get_tex_class(int icp, int ocp, int mt, int nos)
{
int i = 0;
unsigned int prrr = 0;
unsigned int nmrr = 0;
int c_icp, c_ocp, c_mt, c_nos;
RCP15_PRRR(prrr);
RCP15_NMRR(nmrr);
for (i = 0; i < NUM_TEX_CLASS; i++) {
c_nos = PRRR_NOS(prrr, i);
c_mt = PRRR_MT(prrr, i);
c_icp = NMRR_ICP(nmrr, i);
c_ocp = NMRR_OCP(nmrr, i);
if (icp == c_icp && ocp == c_ocp && c_mt == mt && c_nos == nos)
return i;
}
return -ENODEV;
}
static void __init setup_iommu_tex_classes(void)
{
msm_iommu_tex_class[MSM_IOMMU_ATTR_NONCACHED] =
get_tex_class(CP_NONCACHED, CP_NONCACHED, MT_NORMAL, 1);
msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WB_WA] =
get_tex_class(CP_WB_WA, CP_WB_WA, MT_NORMAL, 1);
msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WB_NWA] =
get_tex_class(CP_WB_NWA, CP_WB_NWA, MT_NORMAL, 1);
msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WT] =
get_tex_class(CP_WT, CP_WT, MT_NORMAL, 1);
}
static int __init msm_iommu_init(void)
{
setup_iommu_tex_classes();
bus_set_iommu(&platform_bus_type, &msm_iommu_ops);
return 0;
}
subsys_initcall(msm_iommu_init);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");