sched: Remove double_rq_lock() from __migrate_task()

[linux/fpc-iii.git] / drivers / iommu / fsl_pamu.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, 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()
{
        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);