blob: 2ee9ba6a27bdf6fbdccac31616cf343c2217c56b [file] [log] [blame]
/* Copyright (c) 2012 The Linux Foundation. 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/iommu.h>
#include <linux/scatterlist.h>
#include <asm/cacheflush.h>
#include <mach/iommu.h>
#include "msm_iommu_pagetable.h"
/* Sharability attributes of MSM IOMMU mappings */
#define MSM_IOMMU_ATTR_NON_SH 0x0
#define MSM_IOMMU_ATTR_SH 0x4
/* Cacheability attributes of MSM IOMMU mappings */
#define MSM_IOMMU_ATTR_NONCACHED 0x0
#define MSM_IOMMU_ATTR_CACHED_WB_WA 0x1
#define MSM_IOMMU_ATTR_CACHED_WB_NWA 0x2
#define MSM_IOMMU_ATTR_CACHED_WT 0x3
static int msm_iommu_tex_class[4];
static inline void clean_pte(unsigned long *start, unsigned long *end,
int redirect)
{
if (!redirect)
dmac_flush_range(start, end);
}
int msm_iommu_pagetable_alloc(struct iommu_pt *pt)
{
pt->fl_table = (unsigned long *)__get_free_pages(GFP_KERNEL,
get_order(SZ_16K));
if (!pt->fl_table)
return -ENOMEM;
memset(pt->fl_table, 0, SZ_16K);
clean_pte(pt->fl_table, pt->fl_table + NUM_FL_PTE, pt->redirect);
return 0;
}
void msm_iommu_pagetable_free(struct iommu_pt *pt)
{
unsigned long *fl_table;
int i;
fl_table = pt->fl_table;
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)fl_table, get_order(SZ_16K));
pt->fl_table = 0;
}
static int __get_pgprot(int prot, int len)
{
unsigned int pgprot;
int tex;
if (!(prot & (IOMMU_READ | IOMMU_WRITE))) {
prot |= IOMMU_READ | IOMMU_WRITE;
WARN_ONCE(1, "No attributes in iommu mapping; assuming RW\n");
}
if ((prot & IOMMU_WRITE) && !(prot & IOMMU_READ)) {
prot |= IOMMU_READ;
WARN_ONCE(1, "Write-only unsupported; falling back to RW\n");
}
if (prot & IOMMU_CACHE)
tex = (pgprot_kernel >> 2) & 0x07;
else
tex = msm_iommu_tex_class[MSM_IOMMU_ATTR_NONCACHED];
if (tex < 0 || tex > NUM_TEX_CLASS - 1)
return 0;
if (len == SZ_16M || len == SZ_1M) {
pgprot = FL_SHARED;
pgprot |= tex & 0x01 ? FL_BUFFERABLE : 0;
pgprot |= tex & 0x02 ? FL_CACHEABLE : 0;
pgprot |= tex & 0x04 ? FL_TEX0 : 0;
pgprot |= FL_AP0 | FL_AP1;
pgprot |= prot & IOMMU_WRITE ? 0 : FL_AP2;
} else {
pgprot = SL_SHARED;
pgprot |= tex & 0x01 ? SL_BUFFERABLE : 0;
pgprot |= tex & 0x02 ? SL_CACHEABLE : 0;
pgprot |= tex & 0x04 ? SL_TEX0 : 0;
pgprot |= SL_AP0 | SL_AP1;
pgprot |= prot & IOMMU_WRITE ? 0 : SL_AP2;
}
return pgprot;
}
int msm_iommu_pagetable_map(struct iommu_pt *pt, unsigned long va,
phys_addr_t pa, size_t len, int prot)
{
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;
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 (!pt->fl_table) {
pr_debug("Null page table\n");
ret = -EINVAL;
goto fail;
}
pgprot = __get_pgprot(prot, len);
if (!pgprot) {
ret = -EINVAL;
goto fail;
}
fl_offset = FL_OFFSET(va); /* Upper 12 bits */
fl_pte = pt->fl_table + fl_offset; /* int pointers, 4 bytes */
if (len == SZ_16M) {
int i = 0;
for (i = 0; i < 16; i++)
if (*(fl_pte+i)) {
ret = -EBUSY;
goto fail;
}
for (i = 0; i < 16; i++)
*(fl_pte+i) = (pa & 0xFF000000) | FL_SUPERSECTION |
FL_TYPE_SECT | FL_SHARED | FL_NG | pgprot;
clean_pte(fl_pte, fl_pte + 16, pt->redirect);
}
if (len == SZ_1M) {
if (*fl_pte) {
ret = -EBUSY;
goto fail;
}
*fl_pte = (pa & 0xFFF00000) | FL_NG | FL_TYPE_SECT
| FL_SHARED | pgprot;
clean_pte(fl_pte, fl_pte + 1, pt->redirect);
}
/* Need a 2nd level table */
if (len == SZ_4K || len == SZ_64K) {
if (*fl_pte == 0) {
unsigned long *sl;
sl = (unsigned long *) __get_free_pages(GFP_KERNEL,
get_order(SZ_4K));
if (!sl) {
pr_debug("Could not allocate second level table\n");
ret = -ENOMEM;
goto fail;
}
memset(sl, 0, SZ_4K);
clean_pte(sl, sl + NUM_SL_PTE, pt->redirect);
*fl_pte = ((((int)__pa(sl)) & FL_BASE_MASK) | \
FL_TYPE_TABLE);
clean_pte(fl_pte, fl_pte + 1, pt->redirect);
}
if (!(*fl_pte & FL_TYPE_TABLE)) {
ret = -EBUSY;
goto fail;
}
}
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) {
if (*sl_pte) {
ret = -EBUSY;
goto fail;
}
*sl_pte = (pa & SL_BASE_MASK_SMALL) | SL_NG | SL_SHARED
| SL_TYPE_SMALL | pgprot;
clean_pte(sl_pte, sl_pte + 1, pt->redirect);
}
if (len == SZ_64K) {
int i;
for (i = 0; i < 16; i++)
if (*(sl_pte+i)) {
ret = -EBUSY;
goto fail;
}
for (i = 0; i < 16; i++)
*(sl_pte+i) = (pa & SL_BASE_MASK_LARGE) | SL_NG
| SL_SHARED | SL_TYPE_LARGE | pgprot;
clean_pte(sl_pte, sl_pte + 16, pt->redirect);
}
fail:
return ret;
}
size_t msm_iommu_pagetable_unmap(struct iommu_pt *pt, unsigned long va,
size_t len)
{
unsigned long *fl_pte;
unsigned long fl_offset;
unsigned long *sl_table;
unsigned long *sl_pte;
unsigned long sl_offset;
int i, ret = 0;
if (len != SZ_16M && len != SZ_1M &&
len != SZ_64K && len != SZ_4K) {
pr_debug("Bad length: %d\n", len);
ret = -EINVAL;
goto fail;
}
if (!pt->fl_table) {
pr_debug("Null page table\n");
ret = -EINVAL;
goto fail;
}
fl_offset = FL_OFFSET(va); /* Upper 12 bits */
fl_pte = pt->fl_table + fl_offset; /* int pointers, 4 bytes */
if (*fl_pte == 0) {
pr_debug("First level PTE is 0\n");
ret = -ENODEV;
goto fail;
}
/* Unmap supersection */
if (len == SZ_16M) {
for (i = 0; i < 16; i++)
*(fl_pte+i) = 0;
clean_pte(fl_pte, fl_pte + 16, pt->redirect);
}
if (len == SZ_1M) {
*fl_pte = 0;
clean_pte(fl_pte, fl_pte + 1, pt->redirect);
}
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;
clean_pte(sl_pte, sl_pte + 16, pt->redirect);
}
if (len == SZ_4K) {
*sl_pte = 0;
clean_pte(sl_pte, sl_pte + 1, pt->redirect);
}
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;
clean_pte(fl_pte, fl_pte + 1, pt->redirect);
}
}
fail:
return ret;
}
static unsigned int get_phys_addr(struct scatterlist *sg)
{
/*
* Try sg_dma_address first so that we can
* map carveout regions that do not have a
* struct page associated with them.
*/
unsigned int pa = sg_dma_address(sg);
if (pa == 0)
pa = sg_phys(sg);
return pa;
}
int msm_iommu_pagetable_map_range(struct iommu_pt *pt, unsigned int va,
struct scatterlist *sg, unsigned int len, int prot)
{
unsigned int pa;
unsigned int offset = 0;
unsigned int pgprot;
unsigned long *fl_pte;
unsigned long fl_offset;
unsigned long *sl_table;
unsigned long sl_offset, sl_start;
unsigned int chunk_offset = 0;
unsigned int chunk_pa;
int ret = 0;
BUG_ON(len & (SZ_4K - 1));
pgprot = __get_pgprot(prot, SZ_4K);
if (!pgprot) {
ret = -EINVAL;
goto fail;
}
fl_offset = FL_OFFSET(va); /* Upper 12 bits */
fl_pte = pt->fl_table + fl_offset; /* int pointers, 4 bytes */
sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK));
sl_offset = SL_OFFSET(va);
chunk_pa = get_phys_addr(sg);
if (chunk_pa == 0) {
pr_debug("No dma address for sg %p\n", sg);
ret = -EINVAL;
goto fail;
}
while (offset < len) {
/* Set up a 2nd level page table if one doesn't exist */
if (*fl_pte == 0) {
sl_table = (unsigned long *)
__get_free_pages(GFP_KERNEL, get_order(SZ_4K));
if (!sl_table) {
pr_debug("Could not allocate second level table\n");
ret = -ENOMEM;
goto fail;
}
memset(sl_table, 0, SZ_4K);
clean_pte(sl_table, sl_table + NUM_SL_PTE,
pt->redirect);
*fl_pte = ((((int)__pa(sl_table)) & FL_BASE_MASK) |
FL_TYPE_TABLE);
clean_pte(fl_pte, fl_pte + 1, pt->redirect);
} else
sl_table = (unsigned long *)
__va(((*fl_pte) & FL_BASE_MASK));
/* Keep track of initial position so we
* don't clean more than we have to
*/
sl_start = sl_offset;
/* Build the 2nd level page table */
while (offset < len && sl_offset < NUM_SL_PTE) {
pa = chunk_pa + chunk_offset;
sl_table[sl_offset] = (pa & SL_BASE_MASK_SMALL) |
pgprot | SL_NG | SL_SHARED | SL_TYPE_SMALL;
sl_offset++;
offset += SZ_4K;
chunk_offset += SZ_4K;
if (chunk_offset >= sg->length && offset < len) {
chunk_offset = 0;
sg = sg_next(sg);
chunk_pa = get_phys_addr(sg);
if (chunk_pa == 0) {
pr_debug("No dma address for sg %p\n",
sg);
ret = -EINVAL;
goto fail;
}
}
}
clean_pte(sl_table + sl_start, sl_table + sl_offset,
pt->redirect);
fl_pte++;
sl_offset = 0;
}
fail:
return ret;
}
void msm_iommu_pagetable_unmap_range(struct iommu_pt *pt, unsigned int va,
unsigned int len)
{
unsigned int offset = 0;
unsigned long *fl_pte;
unsigned long fl_offset;
unsigned long *sl_table;
unsigned long sl_start, sl_end;
int used, i;
BUG_ON(len & (SZ_4K - 1));
fl_offset = FL_OFFSET(va); /* Upper 12 bits */
fl_pte = pt->fl_table + fl_offset; /* int pointers, 4 bytes */
sl_start = SL_OFFSET(va);
while (offset < len) {
sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK));
sl_end = ((len - offset) / SZ_4K) + sl_start;
if (sl_end > NUM_SL_PTE)
sl_end = NUM_SL_PTE;
memset(sl_table + sl_start, 0, (sl_end - sl_start) * 4);
clean_pte(sl_table + sl_start, sl_table + sl_end,
pt->redirect);
offset += (sl_end - sl_start) * SZ_4K;
/* Unmap and free the 2nd level table if all mappings in it
* were removed. This saves memory, but the table will need
* to be re-allocated the next time someone tries to map these
* VAs.
*/
used = 0;
/* If we just unmapped the whole table, don't bother
* seeing if there are still used entries left.
*/
if (sl_end - sl_start != NUM_SL_PTE)
for (i = 0; i < NUM_SL_PTE; i++)
if (sl_table[i]) {
used = 1;
break;
}
if (!used) {
free_page((unsigned long)sl_table);
*fl_pte = 0;
clean_pte(fl_pte, fl_pte + 1, pt->redirect);
}
sl_start = 0;
fl_pte++;
}
}
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);
}
void __init msm_iommu_pagetable_init(void)
{
setup_iommu_tex_classes();
}