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linux/drivers/iommu/fsl_pamu.c

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/*
* 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, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (C) 2013 Freescale Semiconductor, Inc.
*
*/
#define pr_fmt(fmt) "fsl-pamu: %s: " fmt, __func__
#include <linux/init.h>
#include <linux/iommu.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/of_platform.h>
#include <linux/bootmem.h>
#include <linux/genalloc.h>
#include <asm/io.h>
#include <asm/bitops.h>
#include <asm/fsl_guts.h>
#include "fsl_pamu.h"
/* define indexes for each operation mapping scenario */
#define OMI_QMAN 0x00
#define OMI_FMAN 0x01
#define OMI_QMAN_PRIV 0x02
#define OMI_CAAM 0x03
#define make64(high, low) (((u64)(high) << 32) | (low))
struct pamu_isr_data {
void __iomem *pamu_reg_base; /* Base address of PAMU regs*/
unsigned int count; /* The number of PAMUs */
};
static struct paace *ppaact;
static struct paace *spaact;
static struct ome *omt;
/*
* Table for matching compatible strings, for device tree
* guts node, for QorIQ SOCs.
* "fsl,qoriq-device-config-2.0" corresponds to T4 & B4
* SOCs. For the older SOCs "fsl,qoriq-device-config-1.0"
* string would be used.
*/
static const struct of_device_id guts_device_ids[] = {
{ .compatible = "fsl,qoriq-device-config-1.0", },
{ .compatible = "fsl,qoriq-device-config-2.0", },
{}
};
/*
* Table for matching compatible strings, for device tree
* L3 cache controller node.
* "fsl,t4240-l3-cache-controller" corresponds to T4,
* "fsl,b4860-l3-cache-controller" corresponds to B4 &
* "fsl,p4080-l3-cache-controller" corresponds to other,
* SOCs.
*/
static const struct of_device_id l3_device_ids[] = {
{ .compatible = "fsl,t4240-l3-cache-controller", },
{ .compatible = "fsl,b4860-l3-cache-controller", },
{ .compatible = "fsl,p4080-l3-cache-controller", },
{}
};
/* maximum subwindows permitted per liodn */
static u32 max_subwindow_count;
/* Pool for fspi allocation */
struct gen_pool *spaace_pool;
/**
* pamu_get_max_subwin_cnt() - Return the maximum supported
* subwindow count per liodn.
*
*/
u32 pamu_get_max_subwin_cnt(void)
{
return max_subwindow_count;
}
/**
* pamu_get_ppaace() - Return the primary PACCE
* @liodn: liodn PAACT index for desired PAACE
*
* Returns the ppace pointer upon success else return
* null.
*/
static struct paace *pamu_get_ppaace(int liodn)
{
if (!ppaact || liodn >= PAACE_NUMBER_ENTRIES) {
pr_debug("PPAACT doesn't exist\n");
return NULL;
}
return &ppaact[liodn];
}
/**
* pamu_enable_liodn() - Set valid bit of PACCE
* @liodn: liodn PAACT index for desired PAACE
*
* Returns 0 upon success else error code < 0 returned
*/
int pamu_enable_liodn(int liodn)
{
struct paace *ppaace;
ppaace = pamu_get_ppaace(liodn);
if (!ppaace) {
pr_debug("Invalid primary paace entry\n");
return -ENOENT;
}
if (!get_bf(ppaace->addr_bitfields, PPAACE_AF_WSE)) {
pr_debug("liodn %d not configured\n", liodn);
return -EINVAL;
}
/* Ensure that all other stores to the ppaace complete first */
mb();
set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_VALID);
mb();
return 0;
}
/**
* pamu_disable_liodn() - Clears valid bit of PACCE
* @liodn: liodn PAACT index for desired PAACE
*
* Returns 0 upon success else error code < 0 returned
*/
int pamu_disable_liodn(int liodn)
{
struct paace *ppaace;
ppaace = pamu_get_ppaace(liodn);
if (!ppaace) {
pr_debug("Invalid primary paace entry\n");
return -ENOENT;
}
set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_INVALID);
mb();
return 0;
}
/* Derive the window size encoding for a particular PAACE entry */
static unsigned int map_addrspace_size_to_wse(phys_addr_t addrspace_size)
{
/* Bug if not a power of 2 */
BUG_ON((addrspace_size & (addrspace_size - 1)));
/* window size is 2^(WSE+1) bytes */
return fls64(addrspace_size) - 2;
}
/* Derive the PAACE window count encoding for the subwindow count */
static unsigned int map_subwindow_cnt_to_wce(u32 subwindow_cnt)
{
/* window count is 2^(WCE+1) bytes */
return __ffs(subwindow_cnt) - 1;
}
/*
* Set the PAACE type as primary and set the coherency required domain
* attribute
*/
static void pamu_init_ppaace(struct paace *ppaace)
{
set_bf(ppaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_PRIMARY);
set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
PAACE_M_COHERENCE_REQ);
}
/*
* Set the PAACE type as secondary and set the coherency required domain
* attribute.
*/
static void pamu_init_spaace(struct paace *spaace)
{
set_bf(spaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_SECONDARY);
set_bf(spaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
PAACE_M_COHERENCE_REQ);
}
/*
* Return the spaace (corresponding to the secondary window index)
* for a particular ppaace.
*/
static struct paace *pamu_get_spaace(struct paace *paace, u32 wnum)
{
u32 subwin_cnt;
struct paace *spaace = NULL;
subwin_cnt = 1UL << (get_bf(paace->impl_attr, PAACE_IA_WCE) + 1);
if (wnum < subwin_cnt)
spaace = &spaact[paace->fspi + wnum];
else
pr_debug("secondary paace out of bounds\n");
return spaace;
}
/**
* pamu_get_fspi_and_allocate() - Allocates fspi index and reserves subwindows
* required for primary PAACE in the secondary
* PAACE table.
* @subwin_cnt: Number of subwindows to be reserved.
*
* A PPAACE entry may have a number of associated subwindows. A subwindow
* corresponds to a SPAACE entry in the SPAACT table. Each PAACE entry stores
* the index (fspi) of the first SPAACE entry in the SPAACT table. This
* function returns the index of the first SPAACE entry. The remaining
* SPAACE entries are reserved contiguously from that index.
*
* Returns a valid fspi index in the range of 0 - SPAACE_NUMBER_ENTRIES on success.
* If no SPAACE entry is available or the allocator can not reserve the required
* number of contiguous entries function returns ULONG_MAX indicating a failure.
*
*/
static unsigned long pamu_get_fspi_and_allocate(u32 subwin_cnt)
{
unsigned long spaace_addr;
spaace_addr = gen_pool_alloc(spaace_pool, subwin_cnt * sizeof(struct paace));
if (!spaace_addr)
return ULONG_MAX;
return (spaace_addr - (unsigned long)spaact) / (sizeof(struct paace));
}
/* Release the subwindows reserved for a particular LIODN */
void pamu_free_subwins(int liodn)
{
struct paace *ppaace;
u32 subwin_cnt, size;
ppaace = pamu_get_ppaace(liodn);
if (!ppaace) {
pr_debug("Invalid liodn entry\n");
return;
}
if (get_bf(ppaace->addr_bitfields, PPAACE_AF_MW)) {
subwin_cnt = 1UL << (get_bf(ppaace->impl_attr, PAACE_IA_WCE) + 1);
size = (subwin_cnt - 1) * sizeof(struct paace);
gen_pool_free(spaace_pool, (unsigned long)&spaact[ppaace->fspi], size);
set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
}
}
/*
* Function used for updating stash destination for the coressponding
* LIODN.
*/
int pamu_update_paace_stash(int liodn, u32 subwin, u32 value)
{
struct paace *paace;
paace = pamu_get_ppaace(liodn);
if (!paace) {
pr_debug("Invalid liodn entry\n");
return -ENOENT;
}
if (subwin) {
paace = pamu_get_spaace(paace, subwin - 1);
if (!paace) {
return -ENOENT;
}
}
set_bf(paace->impl_attr, PAACE_IA_CID, value);
mb();
return 0;
}
/* Disable a subwindow corresponding to the LIODN */
int pamu_disable_spaace(int liodn, u32 subwin)
{
struct paace *paace;
paace = pamu_get_ppaace(liodn);
if (!paace) {
pr_debug("Invalid liodn entry\n");
return -ENOENT;
}
if (subwin) {
paace = pamu_get_spaace(paace, subwin - 1);
if (!paace) {
return -ENOENT;
}
set_bf(paace->addr_bitfields, PAACE_AF_V,
PAACE_V_INVALID);
} else {
set_bf(paace->addr_bitfields, PAACE_AF_AP,
PAACE_AP_PERMS_DENIED);
}
mb();
return 0;
}
/**
* pamu_config_paace() - Sets up PPAACE entry for specified liodn
*
* @liodn: Logical IO device number
* @win_addr: starting address of DSA window
* @win-size: size of DSA window
* @omi: Operation mapping index -- if ~omi == 0 then omi not defined
* @rpn: real (true physical) page number
* @stashid: cache stash id for associated cpu -- if ~stashid == 0 then
* stashid not defined
* @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
* snoopid not defined
* @subwin_cnt: number of sub-windows
* @prot: window permissions
*
* Returns 0 upon success else error code < 0 returned
*/
int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
u32 omi, unsigned long rpn, u32 snoopid, u32 stashid,
u32 subwin_cnt, int prot)
{
struct paace *ppaace;
unsigned long fspi;
if ((win_size & (win_size - 1)) || win_size < PAMU_PAGE_SIZE) {
pr_debug("window size too small or not a power of two %llx\n", win_size);
return -EINVAL;
}
if (win_addr & (win_size - 1)) {
pr_debug("window address is not aligned with window size\n");
return -EINVAL;
}
ppaace = pamu_get_ppaace(liodn);
if (!ppaace) {
return -ENOENT;
}
/* window size is 2^(WSE+1) bytes */
set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE,
map_addrspace_size_to_wse(win_size));
pamu_init_ppaace(ppaace);
ppaace->wbah = win_addr >> (PAMU_PAGE_SHIFT + 20);
set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL,
(win_addr >> PAMU_PAGE_SHIFT));
/* set up operation mapping if it's configured */
if (omi < OME_NUMBER_ENTRIES) {
set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
ppaace->op_encode.index_ot.omi = omi;
} else if (~omi != 0) {
pr_debug("bad operation mapping index: %d\n", omi);
return -EINVAL;
}
/* configure stash id */
if (~stashid != 0)
set_bf(ppaace->impl_attr, PAACE_IA_CID, stashid);
/* configure snoop id */
if (~snoopid != 0)
ppaace->domain_attr.to_host.snpid = snoopid;
if (subwin_cnt) {
/* The first entry is in the primary PAACE instead */
fspi = pamu_get_fspi_and_allocate(subwin_cnt - 1);
if (fspi == ULONG_MAX) {
pr_debug("spaace indexes exhausted\n");
return -EINVAL;
}
/* window count is 2^(WCE+1) bytes */
set_bf(ppaace->impl_attr, PAACE_IA_WCE,
map_subwindow_cnt_to_wce(subwin_cnt));
set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0x1);
ppaace->fspi = fspi;
} else {
set_bf(ppaace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
ppaace->twbah = rpn >> 20;
set_bf(ppaace->win_bitfields, PAACE_WIN_TWBAL, rpn);
set_bf(ppaace->addr_bitfields, PAACE_AF_AP, prot);
set_bf(ppaace->impl_attr, PAACE_IA_WCE, 0);
set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
}
mb();
return 0;
}
/**
* pamu_config_spaace() - Sets up SPAACE entry for specified subwindow
*
* @liodn: Logical IO device number
* @subwin_cnt: number of sub-windows associated with dma-window
* @subwin: subwindow index
* @subwin_size: size of subwindow
* @omi: Operation mapping index
* @rpn: real (true physical) page number
* @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
* snoopid not defined
* @stashid: cache stash id for associated cpu
* @enable: enable/disable subwindow after reconfiguration
* @prot: sub window permissions
*
* Returns 0 upon success else error code < 0 returned
*/
int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin,
phys_addr_t subwin_size, u32 omi, unsigned long rpn,
u32 snoopid, u32 stashid, int enable, int prot)
{
struct paace *paace;
/* setup sub-windows */
if (!subwin_cnt) {
pr_debug("Invalid subwindow count\n");
return -EINVAL;
}
paace = pamu_get_ppaace(liodn);
if (subwin > 0 && subwin < subwin_cnt && paace) {
paace = pamu_get_spaace(paace, subwin - 1);
if (paace && !(paace->addr_bitfields & PAACE_V_VALID)) {
pamu_init_spaace(paace);
set_bf(paace->addr_bitfields, SPAACE_AF_LIODN, liodn);
}
}
if (!paace) {
pr_debug("Invalid liodn entry\n");
return -ENOENT;
}
if ((subwin_size & (subwin_size - 1)) || subwin_size < PAMU_PAGE_SIZE) {
pr_debug("subwindow size out of range, or not a power of 2\n");
return -EINVAL;
}
if (rpn == ULONG_MAX) {
pr_debug("real page number out of range\n");
return -EINVAL;
}
/* window size is 2^(WSE+1) bytes */
set_bf(paace->win_bitfields, PAACE_WIN_SWSE,
map_addrspace_size_to_wse(subwin_size));
set_bf(paace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
paace->twbah = rpn >> 20;
set_bf(paace->win_bitfields, PAACE_WIN_TWBAL, rpn);
set_bf(paace->addr_bitfields, PAACE_AF_AP, prot);
/* configure snoop id */
if (~snoopid != 0)
paace->domain_attr.to_host.snpid = snoopid;
/* set up operation mapping if it's configured */
if (omi < OME_NUMBER_ENTRIES) {
set_bf(paace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
paace->op_encode.index_ot.omi = omi;
} else if (~omi != 0) {
pr_debug("bad operation mapping index: %d\n", omi);
return -EINVAL;
}
if (~stashid != 0)
set_bf(paace->impl_attr, PAACE_IA_CID, stashid);
smp_wmb();
if (enable)
set_bf(paace->addr_bitfields, PAACE_AF_V, PAACE_V_VALID);
mb();
return 0;
}
/**
* get_ome_index() - Returns the index in the operation mapping table
* for device.
* @*omi_index: pointer for storing the index value
*
*/
void get_ome_index(u32 *omi_index, struct device *dev)
{
if (of_device_is_compatible(dev->of_node, "fsl,qman-portal"))
*omi_index = OMI_QMAN;
if (of_device_is_compatible(dev->of_node, "fsl,qman"))
*omi_index = OMI_QMAN_PRIV;
}
/**
* get_stash_id - Returns stash destination id corresponding to a
* cache type and vcpu.
* @stash_dest_hint: L1, L2 or L3
* @vcpu: vpcu target for a particular cache type.
*
* Returs stash on success or ~(u32)0 on failure.
*
*/
u32 get_stash_id(u32 stash_dest_hint, u32 vcpu)
{
const u32 *prop;
struct device_node *node;
u32 cache_level;
int len, found = 0;
int i;
/* Fastpath, exit early if L3/CPC cache is target for stashing */
if (stash_dest_hint == PAMU_ATTR_CACHE_L3) {
node = of_find_matching_node(NULL, l3_device_ids);
if (node) {
prop = of_get_property(node, "cache-stash-id", 0);
if (!prop) {
pr_debug("missing cache-stash-id at %s\n", node->full_name);
of_node_put(node);
return ~(u32)0;
}
of_node_put(node);
return be32_to_cpup(prop);
}
return ~(u32)0;
}
for_each_node_by_type(node, "cpu") {
prop = of_get_property(node, "reg", &len);
for (i = 0; i < len / sizeof(u32); i++) {
if (be32_to_cpup(&prop[i]) == vcpu) {
found = 1;
goto found_cpu_node;
}
}
}
found_cpu_node:
/* find the hwnode that represents the cache */
for (cache_level = PAMU_ATTR_CACHE_L1; (cache_level < PAMU_ATTR_CACHE_L3) && found; cache_level++) {
if (stash_dest_hint == cache_level) {
prop = of_get_property(node, "cache-stash-id", 0);
if (!prop) {
pr_debug("missing cache-stash-id at %s\n", node->full_name);
of_node_put(node);
return ~(u32)0;
}
of_node_put(node);
return be32_to_cpup(prop);
}
prop = of_get_property(node, "next-level-cache", 0);
if (!prop) {
pr_debug("can't find next-level-cache at %s\n",
node->full_name);
of_node_put(node);
return ~(u32)0; /* can't traverse any further */
}
of_node_put(node);
/* advance to next node in cache hierarchy */
node = of_find_node_by_phandle(*prop);
if (!node) {
pr_debug("Invalid node for cache hierarchy\n");
return ~(u32)0;
}
}
pr_debug("stash dest not found for %d on vcpu %d\n",
stash_dest_hint, vcpu);
return ~(u32)0;
}
/* Identify if the PAACT table entry belongs to QMAN, BMAN or QMAN Portal */
#define QMAN_PAACE 1
#define QMAN_PORTAL_PAACE 2
#define BMAN_PAACE 3
/**
* Setup operation mapping and stash destinations for QMAN and QMAN portal.
* Memory accesses to QMAN and BMAN private memory need not be coherent, so
* clear the PAACE entry coherency attribute for them.
*/
static void setup_qbman_paace(struct paace *ppaace, int paace_type)
{
switch (paace_type) {
case QMAN_PAACE:
set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
ppaace->op_encode.index_ot.omi = OMI_QMAN_PRIV;
/* setup QMAN Private data stashing for the L3 cache */
set_bf(ppaace->impl_attr, PAACE_IA_CID, get_stash_id(PAMU_ATTR_CACHE_L3, 0));
set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
0);
break;
case QMAN_PORTAL_PAACE:
set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
ppaace->op_encode.index_ot.omi = OMI_QMAN;
/*Set DQRR and Frame stashing for the L3 cache */
set_bf(ppaace->impl_attr, PAACE_IA_CID, get_stash_id(PAMU_ATTR_CACHE_L3, 0));
break;
case BMAN_PAACE:
set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
0);
break;
}
}
/**
* Setup the operation mapping table for various devices. This is a static
* table where each table index corresponds to a particular device. PAMU uses
* this table to translate device transaction to appropriate corenet
* transaction.
*/
static void __init setup_omt(struct ome *omt)
{
struct ome *ome;
/* Configure OMI_QMAN */
ome = &omt[OMI_QMAN];
ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READ;
ome->moe[IOE_EREAD0_IDX] = EOE_VALID | EOE_RSA;
ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
ome->moe[IOE_EWRITE0_IDX] = EOE_VALID | EOE_WWSAO;
ome->moe[IOE_DIRECT0_IDX] = EOE_VALID | EOE_LDEC;
ome->moe[IOE_DIRECT1_IDX] = EOE_VALID | EOE_LDECPE;
/* Configure OMI_FMAN */
ome = &omt[OMI_FMAN];
ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READI;
ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
/* Configure OMI_QMAN private */
ome = &omt[OMI_QMAN_PRIV];
ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READ;
ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
ome->moe[IOE_EREAD0_IDX] = EOE_VALID | EOE_RSA;
ome->moe[IOE_EWRITE0_IDX] = EOE_VALID | EOE_WWSA;
/* Configure OMI_CAAM */
ome = &omt[OMI_CAAM];
ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READI;
ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
}
/*
* Get the maximum number of PAACT table entries
* and subwindows supported by PAMU
*/
static void get_pamu_cap_values(unsigned long pamu_reg_base)
{
u32 pc_val;
pc_val = in_be32((u32 *)(pamu_reg_base + PAMU_PC3));
/* Maximum number of subwindows per liodn */
max_subwindow_count = 1 << (1 + PAMU_PC3_MWCE(pc_val));
}
/* Setup PAMU registers pointing to PAACT, SPAACT and OMT */
int setup_one_pamu(unsigned long pamu_reg_base, unsigned long pamu_reg_size,
phys_addr_t ppaact_phys, phys_addr_t spaact_phys,
phys_addr_t omt_phys)
{
u32 *pc;
struct pamu_mmap_regs *pamu_regs;
pc = (u32 *) (pamu_reg_base + PAMU_PC);
pamu_regs = (struct pamu_mmap_regs *)
(pamu_reg_base + PAMU_MMAP_REGS_BASE);
/* set up pointers to corenet control blocks */
out_be32(&pamu_regs->ppbah, upper_32_bits(ppaact_phys));
out_be32(&pamu_regs->ppbal, lower_32_bits(ppaact_phys));
ppaact_phys = ppaact_phys + PAACT_SIZE;
out_be32(&pamu_regs->pplah, upper_32_bits(ppaact_phys));
out_be32(&pamu_regs->pplal, lower_32_bits(ppaact_phys));
out_be32(&pamu_regs->spbah, upper_32_bits(spaact_phys));
out_be32(&pamu_regs->spbal, lower_32_bits(spaact_phys));
spaact_phys = spaact_phys + SPAACT_SIZE;
out_be32(&pamu_regs->splah, upper_32_bits(spaact_phys));
out_be32(&pamu_regs->splal, lower_32_bits(spaact_phys));
out_be32(&pamu_regs->obah, upper_32_bits(omt_phys));
out_be32(&pamu_regs->obal, lower_32_bits(omt_phys));
omt_phys = omt_phys + OMT_SIZE;
out_be32(&pamu_regs->olah, upper_32_bits(omt_phys));
out_be32(&pamu_regs->olal, lower_32_bits(omt_phys));
/*
* set PAMU enable bit,
* allow ppaact & omt to be cached
* & enable PAMU access violation interrupts.
*/
out_be32((u32 *)(pamu_reg_base + PAMU_PICS),
PAMU_ACCESS_VIOLATION_ENABLE);
out_be32(pc, PAMU_PC_PE | PAMU_PC_OCE | PAMU_PC_SPCC | PAMU_PC_PPCC);
return 0;
}
/* Enable all device LIODNS */
static void __init setup_liodns(void)
{
int i, len;
struct paace *ppaace;
struct device_node *node = NULL;
const u32 *prop;
for_each_node_with_property(node, "fsl,liodn") {
prop = of_get_property(node, "fsl,liodn", &len);
for (i = 0; i < len / sizeof(u32); i++) {
int liodn;
liodn = be32_to_cpup(&prop[i]);
if (liodn >= PAACE_NUMBER_ENTRIES) {
pr_debug("Invalid LIODN value %d\n", liodn);
continue;
}
ppaace = pamu_get_ppaace(liodn);
pamu_init_ppaace(ppaace);
/* window size is 2^(WSE+1) bytes */
set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE, 35);
ppaace->wbah = 0;
set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL, 0);
set_bf(ppaace->impl_attr, PAACE_IA_ATM,
PAACE_ATM_NO_XLATE);
set_bf(ppaace->addr_bitfields, PAACE_AF_AP,
PAACE_AP_PERMS_ALL);
if (of_device_is_compatible(node, "fsl,qman-portal"))
setup_qbman_paace(ppaace, QMAN_PORTAL_PAACE);
if (of_device_is_compatible(node, "fsl,qman"))
setup_qbman_paace(ppaace, QMAN_PAACE);
if (of_device_is_compatible(node, "fsl,bman"))
setup_qbman_paace(ppaace, BMAN_PAACE);
mb();
pamu_enable_liodn(liodn);
}
}
}
irqreturn_t pamu_av_isr(int irq, void *arg)
{
struct pamu_isr_data *data = arg;
phys_addr_t phys;
unsigned int i, j, ret;
pr_emerg("access violation interrupt\n");
for (i = 0; i < data->count; i++) {
void __iomem *p = data->pamu_reg_base + i * PAMU_OFFSET;
u32 pics = in_be32(p + PAMU_PICS);
if (pics & PAMU_ACCESS_VIOLATION_STAT) {
u32 avs1 = in_be32(p + PAMU_AVS1);
struct paace *paace;
pr_emerg("POES1=%08x\n", in_be32(p + PAMU_POES1));
pr_emerg("POES2=%08x\n", in_be32(p + PAMU_POES2));
pr_emerg("AVS1=%08x\n", avs1);
pr_emerg("AVS2=%08x\n", in_be32(p + PAMU_AVS2));
pr_emerg("AVA=%016llx\n", make64(in_be32(p + PAMU_AVAH),
in_be32(p + PAMU_AVAL)));
pr_emerg("UDAD=%08x\n", in_be32(p + PAMU_UDAD));
pr_emerg("POEA=%016llx\n", make64(in_be32(p + PAMU_POEAH),
in_be32(p + PAMU_POEAL)));
phys = make64(in_be32(p + PAMU_POEAH),
in_be32(p + PAMU_POEAL));
/* Assume that POEA points to a PAACE */
if (phys) {
u32 *paace = phys_to_virt(phys);
/* Only the first four words are relevant */
for (j = 0; j < 4; j++)
pr_emerg("PAACE[%u]=%08x\n", j, in_be32(paace + j));
}
/* clear access violation condition */
out_be32((p + PAMU_AVS1), avs1 & PAMU_AV_MASK);
paace = pamu_get_ppaace(avs1 >> PAMU_AVS1_LIODN_SHIFT);
BUG_ON(!paace);
/* check if we got a violation for a disabled LIODN */
if (!get_bf(paace->addr_bitfields, PAACE_AF_V)) {
/*
* As per hardware erratum A-003638, access
* violation can be reported for a disabled
* LIODN. If we hit that condition, disable
* access violation reporting.
*/
pics &= ~PAMU_ACCESS_VIOLATION_ENABLE;
} else {
/* Disable the LIODN */
ret = pamu_disable_liodn(avs1 >> PAMU_AVS1_LIODN_SHIFT);
BUG_ON(ret);
pr_emerg("Disabling liodn %x\n", avs1 >> PAMU_AVS1_LIODN_SHIFT);
}
out_be32((p + PAMU_PICS), pics);
}
}
return IRQ_HANDLED;
}
#define LAWAR_EN 0x80000000
#define LAWAR_TARGET_MASK 0x0FF00000
#define LAWAR_TARGET_SHIFT 20
#define LAWAR_SIZE_MASK 0x0000003F
#define LAWAR_CSDID_MASK 0x000FF000
#define LAWAR_CSDID_SHIFT 12
#define LAW_SIZE_4K 0xb
struct ccsr_law {
u32 lawbarh; /* LAWn base address high */
u32 lawbarl; /* LAWn base address low */
u32 lawar; /* LAWn attributes */
u32 reserved;
};
/*
* Create a coherence subdomain for a given memory block.
*/
static int __init create_csd(phys_addr_t phys, size_t size, u32 csd_port_id)
{
struct device_node *np;
const __be32 *iprop;
void __iomem *lac = NULL; /* Local Access Control registers */
struct ccsr_law __iomem *law;
void __iomem *ccm = NULL;
u32 __iomem *csdids;
unsigned int i, num_laws, num_csds;
u32 law_target = 0;
u32 csd_id = 0;
int ret = 0;
np = of_find_compatible_node(NULL, NULL, "fsl,corenet-law");
if (!np)
return -ENODEV;
iprop = of_get_property(np, "fsl,num-laws", NULL);
if (!iprop) {
ret = -ENODEV;
goto error;
}
num_laws = be32_to_cpup(iprop);
if (!num_laws) {
ret = -ENODEV;
goto error;
}
lac = of_iomap(np, 0);
if (!lac) {
ret = -ENODEV;
goto error;
}
/* LAW registers are at offset 0xC00 */
law = lac + 0xC00;
of_node_put(np);
np = of_find_compatible_node(NULL, NULL, "fsl,corenet-cf");
if (!np) {
ret = -ENODEV;
goto error;
}
iprop = of_get_property(np, "fsl,ccf-num-csdids", NULL);
if (!iprop) {
ret = -ENODEV;
goto error;
}
num_csds = be32_to_cpup(iprop);
if (!num_csds) {
ret = -ENODEV;
goto error;
}
ccm = of_iomap(np, 0);
if (!ccm) {
ret = -ENOMEM;
goto error;
}
/* The undocumented CSDID registers are at offset 0x600 */
csdids = ccm + 0x600;
of_node_put(np);
np = NULL;
/* Find an unused coherence subdomain ID */
for (csd_id = 0; csd_id < num_csds; csd_id++) {
if (!csdids[csd_id])
break;
}
/* Store the Port ID in the (undocumented) proper CIDMRxx register */
csdids[csd_id] = csd_port_id;
/* Find the DDR LAW that maps to our buffer. */
for (i = 0; i < num_laws; i++) {
if (law[i].lawar & LAWAR_EN) {
phys_addr_t law_start, law_end;
law_start = make64(law[i].lawbarh, law[i].lawbarl);
law_end = law_start +
(2ULL << (law[i].lawar & LAWAR_SIZE_MASK));
if (law_start <= phys && phys < law_end) {
law_target = law[i].lawar & LAWAR_TARGET_MASK;
break;
}
}
}
if (i == 0 || i == num_laws) {
/* This should never happen*/
ret = -ENOENT;
goto error;
}
/* Find a free LAW entry */
while (law[--i].lawar & LAWAR_EN) {
if (i == 0) {
/* No higher priority LAW slots available */
ret = -ENOENT;
goto error;
}
}
law[i].lawbarh = upper_32_bits(phys);
law[i].lawbarl = lower_32_bits(phys);
wmb();
law[i].lawar = LAWAR_EN | law_target | (csd_id << LAWAR_CSDID_SHIFT) |
(LAW_SIZE_4K + get_order(size));
wmb();
error:
if (ccm)
iounmap(ccm);
if (lac)
iounmap(lac);
if (np)
of_node_put(np);
return ret;
}
/*
* Table of SVRs and the corresponding PORT_ID values. Port ID corresponds to a
* bit map of snoopers for a given range of memory mapped by a LAW.
*
* All future CoreNet-enabled SOCs will have this erratum(A-004510) fixed, so this
* table should never need to be updated. SVRs are guaranteed to be unique, so
* there is no worry that a future SOC will inadvertently have one of these
* values.
*/
static const struct {
u32 svr;
u32 port_id;
} port_id_map[] = {
{0x82100010, 0xFF000000}, /* P2040 1.0 */
{0x82100011, 0xFF000000}, /* P2040 1.1 */
{0x82100110, 0xFF000000}, /* P2041 1.0 */
{0x82100111, 0xFF000000}, /* P2041 1.1 */
{0x82110310, 0xFF000000}, /* P3041 1.0 */
{0x82110311, 0xFF000000}, /* P3041 1.1 */
{0x82010020, 0xFFF80000}, /* P4040 2.0 */
{0x82000020, 0xFFF80000}, /* P4080 2.0 */
{0x82210010, 0xFC000000}, /* P5010 1.0 */
{0x82210020, 0xFC000000}, /* P5010 2.0 */
{0x82200010, 0xFC000000}, /* P5020 1.0 */
{0x82050010, 0xFF800000}, /* P5021 1.0 */
{0x82040010, 0xFF800000}, /* P5040 1.0 */
};
#define SVR_SECURITY 0x80000 /* The Security (E) bit */
static int __init fsl_pamu_probe(struct platform_device *pdev)
{
void __iomem *pamu_regs = NULL;
struct ccsr_guts __iomem *guts_regs = NULL;
u32 pamubypenr, pamu_counter;
unsigned long pamu_reg_off;
unsigned long pamu_reg_base;
struct pamu_isr_data *data = NULL;
struct device_node *guts_node;
u64 size;
struct page *p;
int ret = 0;
int irq;
phys_addr_t ppaact_phys;
phys_addr_t spaact_phys;
phys_addr_t omt_phys;
size_t mem_size = 0;
unsigned int order = 0;
u32 csd_port_id = 0;
unsigned i;
/*
* enumerate all PAMUs and allocate and setup PAMU tables
* for each of them,
* NOTE : All PAMUs share the same LIODN tables.
*/
pamu_regs = of_iomap(pdev->dev.of_node, 0);
if (!pamu_regs) {
dev_err(&pdev->dev, "ioremap of PAMU node failed\n");
return -ENOMEM;
}
of_get_address(pdev->dev.of_node, 0, &size, NULL);
irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
if (irq == NO_IRQ) {
dev_warn(&pdev->dev, "no interrupts listed in PAMU node\n");
goto error;
}
data = kzalloc(sizeof(struct pamu_isr_data), GFP_KERNEL);
if (!data) {
dev_err(&pdev->dev, "PAMU isr data memory allocation failed\n");
ret = -ENOMEM;
goto error;
}
data->pamu_reg_base = pamu_regs;
data->count = size / PAMU_OFFSET;
/* The ISR needs access to the regs, so we won't iounmap them */
ret = request_irq(irq, pamu_av_isr, 0, "pamu", data);
if (ret < 0) {
dev_err(&pdev->dev, "error %i installing ISR for irq %i\n",
ret, irq);
goto error;
}
guts_node = of_find_matching_node(NULL, guts_device_ids);
if (!guts_node) {
dev_err(&pdev->dev, "could not find GUTS node %s\n",
pdev->dev.of_node->full_name);
ret = -ENODEV;
goto error;
}
guts_regs = of_iomap(guts_node, 0);
of_node_put(guts_node);
if (!guts_regs) {
dev_err(&pdev->dev, "ioremap of GUTS node failed\n");
ret = -ENODEV;
goto error;
}
/* read in the PAMU capability registers */
get_pamu_cap_values((unsigned long)pamu_regs);
/*
* To simplify the allocation of a coherency domain, we allocate the
* PAACT and the OMT in the same memory buffer. Unfortunately, this
* wastes more memory compared to allocating the buffers separately.
*/
/* Determine how much memory we need */
mem_size = (PAGE_SIZE << get_order(PAACT_SIZE)) +
(PAGE_SIZE << get_order(SPAACT_SIZE)) +
(PAGE_SIZE << get_order(OMT_SIZE));
order = get_order(mem_size);
p = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!p) {
dev_err(&pdev->dev, "unable to allocate PAACT/SPAACT/OMT block\n");
ret = -ENOMEM;
goto error;
}
ppaact = page_address(p);
ppaact_phys = page_to_phys(p);
/* Make sure the memory is naturally aligned */
if (ppaact_phys & ((PAGE_SIZE << order) - 1)) {
dev_err(&pdev->dev, "PAACT/OMT block is unaligned\n");
ret = -ENOMEM;
goto error;
}
spaact = (void *)ppaact + (PAGE_SIZE << get_order(PAACT_SIZE));
omt = (void *)spaact + (PAGE_SIZE << get_order(SPAACT_SIZE));
dev_dbg(&pdev->dev, "ppaact virt=%p phys=0x%llx\n", ppaact,
(unsigned long long) ppaact_phys);
/* Check to see if we need to implement the work-around on this SOC */
/* Determine the Port ID for our coherence subdomain */
for (i = 0; i < ARRAY_SIZE(port_id_map); i++) {
if (port_id_map[i].svr == (mfspr(SPRN_SVR) & ~SVR_SECURITY)) {
csd_port_id = port_id_map[i].port_id;
dev_dbg(&pdev->dev, "found matching SVR %08x\n",
port_id_map[i].svr);
break;
}
}
if (csd_port_id) {
dev_dbg(&pdev->dev, "creating coherency subdomain at address "
"0x%llx, size %zu, port id 0x%08x", ppaact_phys,
mem_size, csd_port_id);
ret = create_csd(ppaact_phys, mem_size, csd_port_id);
if (ret) {
dev_err(&pdev->dev, "could not create coherence "
"subdomain\n");
return ret;
}
}
spaact_phys = virt_to_phys(spaact);
omt_phys = virt_to_phys(omt);
spaace_pool = gen_pool_create(ilog2(sizeof(struct paace)), -1);
if (!spaace_pool) {
ret = -ENOMEM;
dev_err(&pdev->dev, "PAMU : failed to allocate spaace gen pool\n");
goto error;
}
ret = gen_pool_add(spaace_pool, (unsigned long)spaact, SPAACT_SIZE, -1);
if (ret)
goto error_genpool;
pamubypenr = in_be32(&guts_regs->pamubypenr);
for (pamu_reg_off = 0, pamu_counter = 0x80000000; pamu_reg_off < size;
pamu_reg_off += PAMU_OFFSET, pamu_counter >>= 1) {
pamu_reg_base = (unsigned long) pamu_regs + pamu_reg_off;
setup_one_pamu(pamu_reg_base, pamu_reg_off, ppaact_phys,
spaact_phys, omt_phys);
/* Disable PAMU bypass for this PAMU */
pamubypenr &= ~pamu_counter;
}
setup_omt(omt);
/* Enable all relevant PAMU(s) */
out_be32(&guts_regs->pamubypenr, pamubypenr);
iounmap(guts_regs);
/* Enable DMA for the LIODNs in the device tree*/
setup_liodns();
return 0;
error_genpool:
gen_pool_destroy(spaace_pool);
error:
if (irq != NO_IRQ)
free_irq(irq, data);
if (data) {
memset(data, 0, sizeof(struct pamu_isr_data));
kfree(data);
}
if (pamu_regs)
iounmap(pamu_regs);
if (guts_regs)
iounmap(guts_regs);
if (ppaact)
free_pages((unsigned long)ppaact, order);
ppaact = NULL;
return ret;
}
static const struct of_device_id fsl_of_pamu_ids[] = {
{
.compatible = "fsl,p4080-pamu",
},
{
.compatible = "fsl,pamu",
},
{},
};
static struct platform_driver fsl_of_pamu_driver = {
.driver = {
.name = "fsl-of-pamu",
.owner = THIS_MODULE,
},
.probe = fsl_pamu_probe,
};
static __init int fsl_pamu_init(void)
{
struct platform_device *pdev = NULL;
struct device_node *np;
int ret;
/*
* The normal OF process calls the probe function at some
* indeterminate later time, after most drivers have loaded. This is
* too late for us, because PAMU clients (like the Qman driver)
* depend on PAMU being initialized early.
*
* So instead, we "manually" call our probe function by creating the
* platform devices ourselves.
*/
/*
* We assume that there is only one PAMU node in the device tree. A
* single PAMU node represents all of the PAMU devices in the SOC
* already. Everything else already makes that assumption, and the
* binding for the PAMU nodes doesn't allow for any parent-child
* relationships anyway. In other words, support for more than one
* PAMU node would require significant changes to a lot of code.
*/
np = of_find_compatible_node(NULL, NULL, "fsl,pamu");
if (!np) {
pr_err("could not find a PAMU node\n");
return -ENODEV;
}
ret = platform_driver_register(&fsl_of_pamu_driver);
if (ret) {
pr_err("could not register driver (err=%i)\n", ret);
goto error_driver_register;
}
pdev = platform_device_alloc("fsl-of-pamu", 0);
if (!pdev) {
pr_err("could not allocate device %s\n",
np->full_name);
ret = -ENOMEM;
goto error_device_alloc;
}
pdev->dev.of_node = of_node_get(np);
ret = pamu_domain_init();
if (ret)
goto error_device_add;
ret = platform_device_add(pdev);
if (ret) {
pr_err("could not add device %s (err=%i)\n",
np->full_name, ret);
goto error_device_add;
}
return 0;
error_device_add:
of_node_put(pdev->dev.of_node);
pdev->dev.of_node = NULL;
platform_device_put(pdev);
error_device_alloc:
platform_driver_unregister(&fsl_of_pamu_driver);
error_driver_register:
of_node_put(np);
return ret;
}
arch_initcall(fsl_pamu_init);
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