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[mirror_ubuntu-bionic-kernel.git] / drivers / staging / tidspbridge / core / tiomap3430.c

/*
 * tiomap.c
 *
 * DSP-BIOS Bridge driver support functions for TI OMAP processors.
 *
 * Processor Manager Driver for TI OMAP3430 EVM.
 *
 * Copyright (C) 2005-2006 Texas Instruments, Inc.
 *
 * This package 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 PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <linux/platform_data/dsp-omap.h>

#include <linux/types.h>
/*  ----------------------------------- Host OS */
#include <dspbridge/host_os.h>
#include <linux/mm.h>
#include <linux/mmzone.h>

/*  ----------------------------------- DSP/BIOS Bridge */
#include <dspbridge/dbdefs.h>

/*  ----------------------------------- OS Adaptation Layer */
#include <dspbridge/drv.h>
#include <dspbridge/sync.h>

/* ------------------------------------ Hardware Abstraction Layer */
#include <hw_defs.h>
#include <hw_mmu.h>

/*  ----------------------------------- Link Driver */
#include <dspbridge/dspdefs.h>
#include <dspbridge/dspchnl.h>
#include <dspbridge/dspdeh.h>
#include <dspbridge/dspio.h>
#include <dspbridge/dspmsg.h>
#include <dspbridge/pwr.h>
#include <dspbridge/io_sm.h>

/*  ----------------------------------- Platform Manager */
#include <dspbridge/dev.h>
#include <dspbridge/dspapi.h>
#include <dspbridge/dmm.h>
#include <dspbridge/wdt.h>

/*  ----------------------------------- Local */
#include "_tiomap.h"
#include "_tiomap_pwr.h"
#include "tiomap_io.h"

/* Offset in shared mem to write to in order to synchronize start with DSP */
#define SHMSYNCOFFSET 4         /* GPP byte offset */

#define BUFFERSIZE 1024

#define TIHELEN_ACKTIMEOUT  10000

#define MMU_SECTION_ADDR_MASK    0xFFF00000
#define MMU_SSECTION_ADDR_MASK   0xFF000000
#define MMU_LARGE_PAGE_MASK      0xFFFF0000
#define MMU_SMALL_PAGE_MASK      0xFFFFF000
#define OMAP3_IVA2_BOOTADDR_MASK 0xFFFFFC00
#define PAGES_II_LVL_TABLE   512
#define PHYS_TO_PAGE(phys)      pfn_to_page((phys) >> PAGE_SHIFT)

/* IVA Boot modes */
#define DIRECT          0
#define IDLE            1

/* Forward Declarations: */
static int bridge_brd_monitor(struct bridge_dev_context *dev_ctxt);
static int bridge_brd_read(struct bridge_dev_context *dev_ctxt,
                                  u8 *host_buff,
                                  u32 dsp_addr, u32 ul_num_bytes,
                                  u32 mem_type);
static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
                                   u32 dsp_addr);
static int bridge_brd_status(struct bridge_dev_context *dev_ctxt,
                                    int *board_state);
static int bridge_brd_stop(struct bridge_dev_context *dev_ctxt);
static int bridge_brd_write(struct bridge_dev_context *dev_ctxt,
                                   u8 *host_buff,
                                   u32 dsp_addr, u32 ul_num_bytes,
                                   u32 mem_type);
static int bridge_brd_set_state(struct bridge_dev_context *dev_ctxt,
                                    u32 brd_state);
static int bridge_brd_mem_copy(struct bridge_dev_context *dev_ctxt,
                                   u32 dsp_dest_addr, u32 dsp_src_addr,
                                   u32 ul_num_bytes, u32 mem_type);
static int bridge_brd_mem_write(struct bridge_dev_context *dev_ctxt,
                                    u8 *host_buff, u32 dsp_addr,
                                    u32 ul_num_bytes, u32 mem_type);
static int bridge_brd_mem_map(struct bridge_dev_context *dev_ctxt,
                                  u32 ul_mpu_addr, u32 virt_addr,
                                  u32 ul_num_bytes, u32 ul_map_attr,
                                  struct page **mapped_pages);
static int bridge_brd_mem_un_map(struct bridge_dev_context *dev_ctxt,
                                     u32 virt_addr, u32 ul_num_bytes);
static int bridge_dev_create(struct bridge_dev_context
                                        **dev_cntxt,
                                        struct dev_object *hdev_obj,
                                        struct cfg_hostres *config_param);
static int bridge_dev_ctrl(struct bridge_dev_context *dev_context,
                                  u32 dw_cmd, void *pargs);
static int bridge_dev_destroy(struct bridge_dev_context *dev_ctxt);
static u32 user_va2_pa(struct mm_struct *mm, u32 address);
static int pte_update(struct bridge_dev_context *dev_ctxt, u32 pa,
                             u32 va, u32 size,
                             struct hw_mmu_map_attrs_t *map_attrs);
static int pte_set(struct pg_table_attrs *pt, u32 pa, u32 va,
                          u32 size, struct hw_mmu_map_attrs_t *attrs);
static int mem_map_vmalloc(struct bridge_dev_context *dev_context,
                                  u32 ul_mpu_addr, u32 virt_addr,
                                  u32 ul_num_bytes,
                                  struct hw_mmu_map_attrs_t *hw_attrs);

bool wait_for_start(struct bridge_dev_context *dev_context,
                        void __iomem *sync_addr);

/*  ----------------------------------- Globals */

/* Attributes of L2 page tables for DSP MMU */
struct page_info {
        u32 num_entries;        /* Number of valid PTEs in the L2 PT */
};

/* Attributes used to manage the DSP MMU page tables */
struct pg_table_attrs {
        spinlock_t pg_lock;     /* Critical section object handle */

        u32 l1_base_pa;         /* Physical address of the L1 PT */
        u32 l1_base_va;         /* Virtual  address of the L1 PT */
        u32 l1_size;            /* Size of the L1 PT */
        u32 l1_tbl_alloc_pa;
        /* Physical address of Allocated mem for L1 table. May not be aligned */
        u32 l1_tbl_alloc_va;
        /* Virtual address of Allocated mem for L1 table. May not be aligned */
        u32 l1_tbl_alloc_sz;
        /* Size of consistent memory allocated for L1 table.
         * May not be aligned */

        u32 l2_base_pa;         /* Physical address of the L2 PT */
        u32 l2_base_va;         /* Virtual  address of the L2 PT */
        u32 l2_size;            /* Size of the L2 PT */
        u32 l2_tbl_alloc_pa;
        /* Physical address of Allocated mem for L2 table. May not be aligned */
        u32 l2_tbl_alloc_va;
        /* Virtual address of Allocated mem for L2 table. May not be aligned */
        u32 l2_tbl_alloc_sz;
        /* Size of consistent memory allocated for L2 table.
         * May not be aligned */

        u32 l2_num_pages;       /* Number of allocated L2 PT */
        /* Array [l2_num_pages] of L2 PT info structs */
        struct page_info *pg_info;
};

/*
 *  This Bridge driver's function interface table.
 */
static struct bridge_drv_interface drv_interface_fxns = {
        /* Bridge API ver. for which this bridge driver is built. */
        BRD_API_MAJOR_VERSION,
        BRD_API_MINOR_VERSION,
        bridge_dev_create,
        bridge_dev_destroy,
        bridge_dev_ctrl,
        bridge_brd_monitor,
        bridge_brd_start,
        bridge_brd_stop,
        bridge_brd_status,
        bridge_brd_read,
        bridge_brd_write,
        bridge_brd_set_state,
        bridge_brd_mem_copy,
        bridge_brd_mem_write,
        bridge_brd_mem_map,
        bridge_brd_mem_un_map,
        /* The following CHNL functions are provided by chnl_io.lib: */
        bridge_chnl_create,
        bridge_chnl_destroy,
        bridge_chnl_open,
        bridge_chnl_close,
        bridge_chnl_add_io_req,
        bridge_chnl_get_ioc,
        bridge_chnl_cancel_io,
        bridge_chnl_flush_io,
        bridge_chnl_get_info,
        bridge_chnl_get_mgr_info,
        bridge_chnl_idle,
        bridge_chnl_register_notify,
        /* The following IO functions are provided by chnl_io.lib: */
        bridge_io_create,
        bridge_io_destroy,
        bridge_io_on_loaded,
        bridge_io_get_proc_load,
        /* The following msg_ctrl functions are provided by chnl_io.lib: */
        bridge_msg_create,
        bridge_msg_create_queue,
        bridge_msg_delete,
        bridge_msg_delete_queue,
        bridge_msg_get,
        bridge_msg_put,
        bridge_msg_register_notify,
        bridge_msg_set_queue_id,
};

static struct notifier_block dsp_mbox_notifier = {
        .notifier_call = io_mbox_msg,
};

static inline void flush_all(struct bridge_dev_context *dev_context)
{
        if (dev_context->brd_state == BRD_DSP_HIBERNATION ||
            dev_context->brd_state == BRD_HIBERNATION)
                wake_dsp(dev_context, NULL);

        hw_mmu_tlb_flush_all(dev_context->dsp_mmu_base);
}

static void bad_page_dump(u32 pa, struct page *pg)
{
        pr_emerg("DSPBRIDGE: MAP function: COUNT 0 FOR PA 0x%x\n", pa);
        pr_emerg("Bad page state in process '%s'\n"
                 "page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n"
                 "Backtrace:\n",
                 current->comm, pg, (int)(2 * sizeof(unsigned long)),
                 (unsigned long)pg->flags, pg->mapping,
                 page_mapcount(pg), page_count(pg));
        dump_stack();
}

/*
 *  ======== bridge_drv_entry ========
 *  purpose:
 *      Bridge Driver entry point.
 */
void bridge_drv_entry(struct bridge_drv_interface **drv_intf,
                   const char *driver_file_name)
{
        if (strcmp(driver_file_name, "UMA") == 0)
                *drv_intf = &drv_interface_fxns;
        else
                dev_dbg(bridge, "%s Unknown Bridge file name", __func__);

}

/*
 *  ======== bridge_brd_monitor ========
 *  purpose:
 *      This bridge_brd_monitor puts DSP into a Loadable state.
 *      i.e Application can load and start the device.
 *
 *  Preconditions:
 *      Device in 'OFF' state.
 */
static int bridge_brd_monitor(struct bridge_dev_context *dev_ctxt)
{
        struct bridge_dev_context *dev_context = dev_ctxt;
        u32 temp;
        struct omap_dsp_platform_data *pdata =
                omap_dspbridge_dev->dev.platform_data;

        temp = (*pdata->dsp_prm_read)(OMAP3430_IVA2_MOD, OMAP2_PM_PWSTST) &
                                        OMAP_POWERSTATEST_MASK;
        if (!(temp & 0x02)) {
                /* IVA2 is not in ON state */
                /* Read and set PM_PWSTCTRL_IVA2  to ON */
                (*pdata->dsp_prm_rmw_bits)(OMAP_POWERSTATEST_MASK,
                        PWRDM_POWER_ON, OMAP3430_IVA2_MOD, OMAP2_PM_PWSTCTRL);
                /* Set the SW supervised state transition */
                (*pdata->dsp_cm_write)(OMAP34XX_CLKSTCTRL_FORCE_WAKEUP,
                                        OMAP3430_IVA2_MOD, OMAP2_CM_CLKSTCTRL);

                /* Wait until the state has moved to ON */
                while ((*pdata->dsp_prm_read)(OMAP3430_IVA2_MOD,
                                              OMAP2_PM_PWSTST) &
                                                OMAP_INTRANSITION_MASK)
                        ;
                /* Disable Automatic transition */
                (*pdata->dsp_cm_write)(OMAP34XX_CLKSTCTRL_DISABLE_AUTO,
                                        OMAP3430_IVA2_MOD, OMAP2_CM_CLKSTCTRL);
        }
        (*pdata->dsp_prm_rmw_bits)(OMAP3430_RST2_IVA2_MASK, 0,
                                        OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
        dsp_clk_enable(DSP_CLK_IVA2);

        /* set the device state to IDLE */
        dev_context->brd_state = BRD_IDLE;

        return 0;
}

/*
 *  ======== bridge_brd_read ========
 *  purpose:
 *      Reads buffers for DSP memory.
 */
static int bridge_brd_read(struct bridge_dev_context *dev_ctxt,
                                  u8 *host_buff, u32 dsp_addr,
                                  u32 ul_num_bytes, u32 mem_type)
{
        int status = 0;
        struct bridge_dev_context *dev_context = dev_ctxt;
        u32 offset;
        u32 dsp_base_addr = dev_ctxt->dsp_base_addr;

        if (dsp_addr < dev_context->dsp_start_add) {
                status = -EPERM;
                return status;
        }
        /* change here to account for the 3 bands of the DSP internal memory */
        if ((dsp_addr - dev_context->dsp_start_add) <
            dev_context->internal_size) {
                offset = dsp_addr - dev_context->dsp_start_add;
        } else {
                status = read_ext_dsp_data(dev_context, host_buff, dsp_addr,
                                           ul_num_bytes, mem_type);
                return status;
        }
        /* copy the data from DSP memory */
        memcpy(host_buff, (void *)(dsp_base_addr + offset), ul_num_bytes);
        return status;
}

/*
 *  ======== bridge_brd_set_state ========
 *  purpose:
 *      This routine updates the Board status.
 */
static int bridge_brd_set_state(struct bridge_dev_context *dev_ctxt,
                                    u32 brd_state)
{
        int status = 0;
        struct bridge_dev_context *dev_context = dev_ctxt;

        dev_context->brd_state = brd_state;
        return status;
}

/*
 *  ======== bridge_brd_start ========
 *  purpose:
 *      Initializes DSP MMU and Starts DSP.
 *
 *  Preconditions:
 *  a) DSP domain is 'ACTIVE'.
 *  b) DSP_RST1 is asserted.
 *  b) DSP_RST2 is released.
 */
static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
                                   u32 dsp_addr)
{
        int status = 0;
        struct bridge_dev_context *dev_context = dev_ctxt;
        void __iomem *sync_addr;
        u32 ul_shm_base;        /* Gpp Phys SM base addr(byte) */
        u32 ul_shm_base_virt;   /* Dsp Virt SM base addr */
        u32 ul_tlb_base_virt;   /* Base of MMU TLB entry */
        u32 shm_sync_pa;
        /* Offset of shm_base_virt from tlb_base_virt */
        u32 ul_shm_offset_virt;
        s32 entry_ndx;
        s32 itmp_entry_ndx = 0; /* DSP-MMU TLB entry base address */
        struct cfg_hostres *resources = NULL;
        u32 temp;
        u32 ul_dsp_clk_rate;
        u32 ul_dsp_clk_addr;
        u32 ul_bios_gp_timer;
        u32 clk_cmd;
        struct io_mgr *hio_mgr;
        u32 ul_load_monitor_timer;
        u32 wdt_en = 0;
        struct omap_dsp_platform_data *pdata =
                omap_dspbridge_dev->dev.platform_data;

        /* The device context contains all the mmu setup info from when the
         * last dsp base image was loaded. The first entry is always
         * SHMMEM base. */
        /* Get SHM_BEG - convert to byte address */
        (void)dev_get_symbol(dev_context->dev_obj, SHMBASENAME,
                             &ul_shm_base_virt);
        ul_shm_base_virt *= DSPWORDSIZE;
        /* DSP Virtual address */
        ul_tlb_base_virt = dev_context->atlb_entry[0].dsp_va;
        ul_shm_offset_virt =
            ul_shm_base_virt - (ul_tlb_base_virt * DSPWORDSIZE);
        /* Kernel logical address */
        ul_shm_base = dev_context->atlb_entry[0].gpp_va + ul_shm_offset_virt;

        /* SHM physical sync address */
        shm_sync_pa = dev_context->atlb_entry[0].gpp_pa + ul_shm_offset_virt +
                        SHMSYNCOFFSET;

        /* 2nd wd is used as sync field */
        sync_addr = ioremap(shm_sync_pa, SZ_32);
        if (!sync_addr)
                return -ENOMEM;

        /* Write a signature into the shm base + offset; this will
         * get cleared when the DSP program starts. */
        if ((ul_shm_base_virt == 0) || (ul_shm_base == 0)) {
                pr_err("%s: Illegal SM base\n", __func__);
                status = -EPERM;
        } else
                __raw_writel(0xffffffff, sync_addr);

        if (!status) {
                resources = dev_context->resources;
                if (!resources)
                        status = -EPERM;

                /* Assert RST1 i.e only the RST only for DSP megacell */
                if (!status) {
                        (*pdata->dsp_prm_rmw_bits)(OMAP3430_RST1_IVA2_MASK,
                                        OMAP3430_RST1_IVA2_MASK,
                                        OMAP3430_IVA2_MOD,
                                        OMAP2_RM_RSTCTRL);

                        /* Mask address with 1K for compatibility */
                        pdata->set_bootaddr(dsp_addr &
                                                OMAP3_IVA2_BOOTADDR_MASK);
                        pdata->set_bootmode(dsp_debug ? IDLE : DIRECT);
                }
        }
        if (!status) {
                /* Reset and Unreset the RST2, so that BOOTADDR is copied to
                 * IVA2 SYSC register */
                (*pdata->dsp_prm_rmw_bits)(OMAP3430_RST2_IVA2_MASK,
                        OMAP3430_RST2_IVA2_MASK, OMAP3430_IVA2_MOD,
                        OMAP2_RM_RSTCTRL);
                udelay(100);
                (*pdata->dsp_prm_rmw_bits)(OMAP3430_RST2_IVA2_MASK, 0,
                                        OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
                udelay(100);

                /* Disbale the DSP MMU */
                hw_mmu_disable(resources->dmmu_base);
                /* Disable TWL */
                hw_mmu_twl_disable(resources->dmmu_base);

                /* Only make TLB entry if both addresses are non-zero */
                for (entry_ndx = 0; entry_ndx < BRDIOCTL_NUMOFMMUTLB;
                     entry_ndx++) {
                        struct bridge_ioctl_extproc *e =
                                &dev_context->atlb_entry[entry_ndx];
                        struct hw_mmu_map_attrs_t map_attrs = {
                                .endianism = e->endianism,
                                .element_size = e->elem_size,
                                .mixed_size = e->mixed_mode,
                        };

                        if (!e->gpp_pa || !e->dsp_va)
                                continue;

                        dev_dbg(bridge,
                                        "MMU %d, pa: 0x%x, va: 0x%x, size: 0x%x",
                                        itmp_entry_ndx,
                                        e->gpp_pa,
                                        e->dsp_va,
                                        e->size);

                        hw_mmu_tlb_add(dev_context->dsp_mmu_base,
                                        e->gpp_pa,
                                        e->dsp_va,
                                        e->size,
                                        itmp_entry_ndx,
                                        &map_attrs, 1, 1);

                        itmp_entry_ndx++;
                }
        }

        /* Lock the above TLB entries and get the BIOS and load monitor timer
         * information */
        if (!status) {
                hw_mmu_num_locked_set(resources->dmmu_base, itmp_entry_ndx);
                hw_mmu_victim_num_set(resources->dmmu_base, itmp_entry_ndx);
                hw_mmu_ttb_set(resources->dmmu_base,
                               dev_context->pt_attrs->l1_base_pa);
                hw_mmu_twl_enable(resources->dmmu_base);
                /* Enable the SmartIdle and AutoIdle bit for MMU_SYSCONFIG */

                temp = __raw_readl((resources->dmmu_base) + 0x10);
                temp = (temp & 0xFFFFFFEF) | 0x11;
                __raw_writel(temp, (resources->dmmu_base) + 0x10);

                /* Let the DSP MMU run */
                hw_mmu_enable(resources->dmmu_base);

                /* Enable the BIOS clock */
                (void)dev_get_symbol(dev_context->dev_obj,
                                     BRIDGEINIT_BIOSGPTIMER, &ul_bios_gp_timer);
                (void)dev_get_symbol(dev_context->dev_obj,
                                     BRIDGEINIT_LOADMON_GPTIMER,
                                     &ul_load_monitor_timer);
        }

        if (!status) {
                if (ul_load_monitor_timer != 0xFFFF) {
                        clk_cmd = (BPWR_ENABLE_CLOCK << MBX_PM_CLK_CMDSHIFT) |
                            ul_load_monitor_timer;
                        dsp_peripheral_clk_ctrl(dev_context, &clk_cmd);
                } else {
                        dev_dbg(bridge, "Not able to get the symbol for Load "
                                "Monitor Timer\n");
                }
        }

        if (!status) {
                if (ul_bios_gp_timer != 0xFFFF) {
                        clk_cmd = (BPWR_ENABLE_CLOCK << MBX_PM_CLK_CMDSHIFT) |
                            ul_bios_gp_timer;
                        dsp_peripheral_clk_ctrl(dev_context, &clk_cmd);
                } else {
                        dev_dbg(bridge,
                                "Not able to get the symbol for BIOS Timer\n");
                }
        }

        if (!status) {
                /* Set the DSP clock rate */
                (void)dev_get_symbol(dev_context->dev_obj,
                                     "_BRIDGEINIT_DSP_FREQ", &ul_dsp_clk_addr);
                /*Set Autoidle Mode for IVA2 PLL */
                (*pdata->dsp_cm_write)(1 << OMAP3430_AUTO_IVA2_DPLL_SHIFT,
                                OMAP3430_IVA2_MOD, OMAP3430_CM_AUTOIDLE_PLL);

                if ((unsigned int *)ul_dsp_clk_addr != NULL) {
                        /* Get the clock rate */
                        ul_dsp_clk_rate = dsp_clk_get_iva2_rate();
                        dev_dbg(bridge, "%s: DSP clock rate (KHZ): 0x%x \n",
                                __func__, ul_dsp_clk_rate);
                        (void)bridge_brd_write(dev_context,
                                               (u8 *) &ul_dsp_clk_rate,
                                               ul_dsp_clk_addr, sizeof(u32), 0);
                }
                /*
                 * Enable Mailbox events and also drain any pending
                 * stale messages.
                 */
                dev_context->mbox = omap_mbox_get("dsp", &dsp_mbox_notifier);
                if (IS_ERR(dev_context->mbox)) {
                        dev_context->mbox = NULL;
                        pr_err("%s: Failed to get dsp mailbox handle\n",
                                                                __func__);
                        status = -EPERM;
                }

        }
        if (!status) {
/*PM_IVA2GRPSEL_PER = 0xC0;*/
                temp = readl(resources->per_pm_base + 0xA8);
                temp = (temp & 0xFFFFFF30) | 0xC0;
                writel(temp, resources->per_pm_base + 0xA8);

/*PM_MPUGRPSEL_PER &= 0xFFFFFF3F; */
                temp = readl(resources->per_pm_base + 0xA4);
                temp = (temp & 0xFFFFFF3F);
                writel(temp, resources->per_pm_base + 0xA4);
/*CM_SLEEPDEP_PER |= 0x04; */
                temp = readl(resources->per_base + 0x44);
                temp = (temp & 0xFFFFFFFB) | 0x04;
                writel(temp, resources->per_base + 0x44);

/*CM_CLKSTCTRL_IVA2 = 0x00000003 -To Allow automatic transitions */
                (*pdata->dsp_cm_write)(OMAP34XX_CLKSTCTRL_ENABLE_AUTO,
                                        OMAP3430_IVA2_MOD, OMAP2_CM_CLKSTCTRL);

                /* Let DSP go */
                dev_dbg(bridge, "%s Unreset\n", __func__);
                /* Enable DSP MMU Interrupts */
                hw_mmu_event_enable(resources->dmmu_base,
                                    HW_MMU_ALL_INTERRUPTS);
                /* release the RST1, DSP starts executing now .. */
                (*pdata->dsp_prm_rmw_bits)(OMAP3430_RST1_IVA2_MASK, 0,
                                        OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);

                dev_dbg(bridge, "Waiting for Sync @ 0x%x\n", *(u32 *)sync_addr);
                dev_dbg(bridge, "DSP c_int00 Address =  0x%x\n", dsp_addr);
                if (dsp_debug)
                        while (__raw_readw(sync_addr))
                                ;

                /* Wait for DSP to clear word in shared memory */
                /* Read the Location */
                if (!wait_for_start(dev_context, sync_addr))
                        status = -ETIMEDOUT;

                dev_get_symbol(dev_context->dev_obj, "_WDT_enable", &wdt_en);
                if (wdt_en) {
                        /* Start wdt */
                        dsp_wdt_sm_set((void *)ul_shm_base);
                        dsp_wdt_enable(true);
                }

                status = dev_get_io_mgr(dev_context->dev_obj, &hio_mgr);
                if (hio_mgr) {
                        io_sh_msetting(hio_mgr, SHM_OPPINFO, NULL);
                        /* Write the synchronization bit to indicate the
                         * completion of OPP table update to DSP
                         */
                        __raw_writel(0XCAFECAFE, sync_addr);

                        /* update board state */
                        dev_context->brd_state = BRD_RUNNING;
                        /* (void)chnlsm_enable_interrupt(dev_context); */
                } else {
                        dev_context->brd_state = BRD_UNKNOWN;
                }
        }

        iounmap(sync_addr);

        return status;
}

/*
 *  ======== bridge_brd_stop ========
 *  purpose:
 *      Puts DSP in self loop.
 *
 *  Preconditions :
 *  a) None
 */
static int bridge_brd_stop(struct bridge_dev_context *dev_ctxt)
{
        int status = 0;
        struct bridge_dev_context *dev_context = dev_ctxt;
        struct pg_table_attrs *pt_attrs;
        u32 dsp_pwr_state;
        struct omap_dsp_platform_data *pdata =
                omap_dspbridge_dev->dev.platform_data;

        if (dev_context->brd_state == BRD_STOPPED)
                return status;

        /* as per TRM, it is advised to first drive the IVA2 to 'Standby' mode,
         * before turning off the clocks.. This is to ensure that there are no
         * pending L3 or other transactons from IVA2 */
        dsp_pwr_state = (*pdata->dsp_prm_read)
                (OMAP3430_IVA2_MOD, OMAP2_PM_PWSTST) & OMAP_POWERSTATEST_MASK;
        if (dsp_pwr_state != PWRDM_POWER_OFF) {
                (*pdata->dsp_prm_rmw_bits)(OMAP3430_RST2_IVA2_MASK, 0,
                                        OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
                sm_interrupt_dsp(dev_context, MBX_PM_DSPIDLE);
                mdelay(10);

                /* IVA2 is not in OFF state */
                /* Set PM_PWSTCTRL_IVA2  to OFF */
                (*pdata->dsp_prm_rmw_bits)(OMAP_POWERSTATEST_MASK,
                        PWRDM_POWER_OFF, OMAP3430_IVA2_MOD, OMAP2_PM_PWSTCTRL);
                /* Set the SW supervised state transition for Sleep */
                (*pdata->dsp_cm_write)(OMAP34XX_CLKSTCTRL_FORCE_SLEEP,
                                        OMAP3430_IVA2_MOD, OMAP2_CM_CLKSTCTRL);
        }
        udelay(10);
        /* Release the Ext Base virtual Address as the next DSP Program
         * may have a different load address */
        if (dev_context->dsp_ext_base_addr)
                dev_context->dsp_ext_base_addr = 0;

        dev_context->brd_state = BRD_STOPPED;   /* update board state */

        dsp_wdt_enable(false);

        /* This is a good place to clear the MMU page tables as well */
        if (dev_context->pt_attrs) {
                pt_attrs = dev_context->pt_attrs;
                memset((u8 *) pt_attrs->l1_base_va, 0x00, pt_attrs->l1_size);
                memset((u8 *) pt_attrs->l2_base_va, 0x00, pt_attrs->l2_size);
                memset((u8 *) pt_attrs->pg_info, 0x00,
                       (pt_attrs->l2_num_pages * sizeof(struct page_info)));
        }
        /* Disable the mailbox interrupts */
        if (dev_context->mbox) {
                omap_mbox_disable_irq(dev_context->mbox, IRQ_RX);
                omap_mbox_put(dev_context->mbox, &dsp_mbox_notifier);
                dev_context->mbox = NULL;
        }
        /* Reset IVA2 clocks*/
        (*pdata->dsp_prm_write)(OMAP3430_RST1_IVA2_MASK |
                        OMAP3430_RST2_IVA2_MASK | OMAP3430_RST3_IVA2_MASK,
                        OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);

        dsp_clock_disable_all(dev_context->dsp_per_clks);
        dsp_clk_disable(DSP_CLK_IVA2);

        return status;
}

/*
 *  ======== bridge_brd_status ========
 *      Returns the board status.
 */
static int bridge_brd_status(struct bridge_dev_context *dev_ctxt,
                                    int *board_state)
{
        struct bridge_dev_context *dev_context = dev_ctxt;
        *board_state = dev_context->brd_state;
        return 0;
}

/*
 *  ======== bridge_brd_write ========
 *      Copies the buffers to DSP internal or external memory.
 */
static int bridge_brd_write(struct bridge_dev_context *dev_ctxt,
                                   u8 *host_buff, u32 dsp_addr,
                                   u32 ul_num_bytes, u32 mem_type)
{
        int status = 0;
        struct bridge_dev_context *dev_context = dev_ctxt;

        if (dsp_addr < dev_context->dsp_start_add) {
                status = -EPERM;
                return status;
        }
        if ((dsp_addr - dev_context->dsp_start_add) <
            dev_context->internal_size) {
                status = write_dsp_data(dev_ctxt, host_buff, dsp_addr,
                                        ul_num_bytes, mem_type);
        } else {
                status = write_ext_dsp_data(dev_context, host_buff, dsp_addr,
                                            ul_num_bytes, mem_type, false);
        }

        return status;
}

/*
 *  ======== bridge_dev_create ========
 *      Creates a driver object. Puts DSP in self loop.
 */
static int bridge_dev_create(struct bridge_dev_context
                                        **dev_cntxt,
                                        struct dev_object *hdev_obj,
                                        struct cfg_hostres *config_param)
{
        int status = 0;
        struct bridge_dev_context *dev_context = NULL;
        s32 entry_ndx;
        struct cfg_hostres *resources = config_param;
        struct pg_table_attrs *pt_attrs;
        u32 pg_tbl_pa;
        u32 pg_tbl_va;
        u32 align_size;
        struct drv_data *drv_datap = dev_get_drvdata(bridge);

        /* Allocate and initialize a data structure to contain the bridge driver
         *  state, which becomes the context for later calls into this driver */
        dev_context = kzalloc(sizeof(struct bridge_dev_context), GFP_KERNEL);
        if (!dev_context) {
                status = -ENOMEM;
                goto func_end;
        }

        dev_context->dsp_start_add = (u32) OMAP_GEM_BASE;
        dev_context->self_loop = (u32) NULL;
        dev_context->dsp_per_clks = 0;
        dev_context->internal_size = OMAP_DSP_SIZE;
        /*  Clear dev context MMU table entries.
         *  These get set on bridge_io_on_loaded() call after program loaded. */
        for (entry_ndx = 0; entry_ndx < BRDIOCTL_NUMOFMMUTLB; entry_ndx++) {
                dev_context->atlb_entry[entry_ndx].gpp_pa =
                    dev_context->atlb_entry[entry_ndx].dsp_va = 0;
        }
        dev_context->dsp_base_addr = (u32) MEM_LINEAR_ADDRESS((void *)
                                                                 (config_param->
                                                                  mem_base
                                                                  [3]),
                                                                 config_param->
                                                                 mem_length
                                                                 [3]);
        if (!dev_context->dsp_base_addr)
                status = -EPERM;

        pt_attrs = kzalloc(sizeof(struct pg_table_attrs), GFP_KERNEL);
        if (pt_attrs != NULL) {
                pt_attrs->l1_size = SZ_16K; /* 4096 entries of 32 bits */
                align_size = pt_attrs->l1_size;
                /* Align sizes are expected to be power of 2 */
                /* we like to get aligned on L1 table size */
                pg_tbl_va = (u32) mem_alloc_phys_mem(pt_attrs->l1_size,
                                                     align_size, &pg_tbl_pa);

                /* Check if the PA is aligned for us */
                if ((pg_tbl_pa) & (align_size - 1)) {
                        /* PA not aligned to page table size ,
                         * try with more allocation and align */
                        mem_free_phys_mem((void *)pg_tbl_va, pg_tbl_pa,
                                          pt_attrs->l1_size);
                        /* we like to get aligned on L1 table size */
                        pg_tbl_va =
                            (u32) mem_alloc_phys_mem((pt_attrs->l1_size) * 2,
                                                     align_size, &pg_tbl_pa);
                        /* We should be able to get aligned table now */
                        pt_attrs->l1_tbl_alloc_pa = pg_tbl_pa;
                        pt_attrs->l1_tbl_alloc_va = pg_tbl_va;
                        pt_attrs->l1_tbl_alloc_sz = pt_attrs->l1_size * 2;
                        /* Align the PA to the next 'align'  boundary */
                        pt_attrs->l1_base_pa =
                            ((pg_tbl_pa) +
                             (align_size - 1)) & (~(align_size - 1));
                        pt_attrs->l1_base_va =
                            pg_tbl_va + (pt_attrs->l1_base_pa - pg_tbl_pa);
                } else {
                        /* We got aligned PA, cool */
                        pt_attrs->l1_tbl_alloc_pa = pg_tbl_pa;
                        pt_attrs->l1_tbl_alloc_va = pg_tbl_va;
                        pt_attrs->l1_tbl_alloc_sz = pt_attrs->l1_size;
                        pt_attrs->l1_base_pa = pg_tbl_pa;
                        pt_attrs->l1_base_va = pg_tbl_va;
                }
                if (pt_attrs->l1_base_va)
                        memset((u8 *) pt_attrs->l1_base_va, 0x00,
                               pt_attrs->l1_size);

                /* number of L2 page tables = DMM pool used + SHMMEM +EXTMEM +
                 * L4 pages */
                pt_attrs->l2_num_pages = ((DMMPOOLSIZE >> 20) + 6);
                pt_attrs->l2_size = HW_MMU_COARSE_PAGE_SIZE *
                    pt_attrs->l2_num_pages;
                align_size = 4; /* Make it u32 aligned */
                /* we like to get aligned on L1 table size */
                pg_tbl_va = (u32) mem_alloc_phys_mem(pt_attrs->l2_size,
                                                     align_size, &pg_tbl_pa);
                pt_attrs->l2_tbl_alloc_pa = pg_tbl_pa;
                pt_attrs->l2_tbl_alloc_va = pg_tbl_va;
                pt_attrs->l2_tbl_alloc_sz = pt_attrs->l2_size;
                pt_attrs->l2_base_pa = pg_tbl_pa;
                pt_attrs->l2_base_va = pg_tbl_va;

                if (pt_attrs->l2_base_va)
                        memset((u8 *) pt_attrs->l2_base_va, 0x00,
                               pt_attrs->l2_size);

                pt_attrs->pg_info = kzalloc(pt_attrs->l2_num_pages *
                                        sizeof(struct page_info), GFP_KERNEL);
                dev_dbg(bridge,
                        "L1 pa %x, va %x, size %x\n L2 pa %x, va "
                        "%x, size %x\n", pt_attrs->l1_base_pa,
                        pt_attrs->l1_base_va, pt_attrs->l1_size,
                        pt_attrs->l2_base_pa, pt_attrs->l2_base_va,
                        pt_attrs->l2_size);
                dev_dbg(bridge, "pt_attrs %p L2 NumPages %x pg_info %p\n",
                        pt_attrs, pt_attrs->l2_num_pages, pt_attrs->pg_info);
        }
        if ((pt_attrs != NULL) && (pt_attrs->l1_base_va != 0) &&
            (pt_attrs->l2_base_va != 0) && (pt_attrs->pg_info != NULL))
                dev_context->pt_attrs = pt_attrs;
        else
                status = -ENOMEM;

        if (!status) {
                spin_lock_init(&pt_attrs->pg_lock);
                dev_context->tc_word_swap_on = drv_datap->tc_wordswapon;

                /* Set the Clock Divisor for the DSP module */
                udelay(5);
                /* MMU address is obtained from the host
                 * resources struct */
                dev_context->dsp_mmu_base = resources->dmmu_base;
        }
        if (!status) {
                dev_context->dev_obj = hdev_obj;
                /* Store current board state. */
                dev_context->brd_state = BRD_UNKNOWN;
                dev_context->resources = resources;
                dsp_clk_enable(DSP_CLK_IVA2);
                bridge_brd_stop(dev_context);
                /* Return ptr to our device state to the DSP API for storage */
                *dev_cntxt = dev_context;
        } else {
                if (pt_attrs != NULL) {
                        kfree(pt_attrs->pg_info);

                        if (pt_attrs->l2_tbl_alloc_va) {
                                mem_free_phys_mem((void *)
                                                  pt_attrs->l2_tbl_alloc_va,
                                                  pt_attrs->l2_tbl_alloc_pa,
                                                  pt_attrs->l2_tbl_alloc_sz);
                        }
                        if (pt_attrs->l1_tbl_alloc_va) {
                                mem_free_phys_mem((void *)
                                                  pt_attrs->l1_tbl_alloc_va,
                                                  pt_attrs->l1_tbl_alloc_pa,
                                                  pt_attrs->l1_tbl_alloc_sz);
                        }
                }
                kfree(pt_attrs);
                kfree(dev_context);
        }
func_end:
        return status;
}

/*
 *  ======== bridge_dev_ctrl ========
 *      Receives device specific commands.
 */
static int bridge_dev_ctrl(struct bridge_dev_context *dev_context,
                                  u32 dw_cmd, void *pargs)
{
        int status = 0;
        struct bridge_ioctl_extproc *pa_ext_proc =
                                        (struct bridge_ioctl_extproc *)pargs;
        s32 ndx;

        switch (dw_cmd) {
        case BRDIOCTL_CHNLREAD:
                break;
        case BRDIOCTL_CHNLWRITE:
                break;
        case BRDIOCTL_SETMMUCONFIG:
                /* store away dsp-mmu setup values for later use */
                for (ndx = 0; ndx < BRDIOCTL_NUMOFMMUTLB; ndx++, pa_ext_proc++)
                        dev_context->atlb_entry[ndx] = *pa_ext_proc;
                break;
        case BRDIOCTL_DEEPSLEEP:
        case BRDIOCTL_EMERGENCYSLEEP:
                /* Currently only DSP Idle is supported Need to update for
                 * later releases */
                status = sleep_dsp(dev_context, PWR_DEEPSLEEP, pargs);
                break;
        case BRDIOCTL_WAKEUP:
                status = wake_dsp(dev_context, pargs);
                break;
        case BRDIOCTL_CLK_CTRL:
                status = 0;
                /* Looking For Baseport Fix for Clocks */
                status = dsp_peripheral_clk_ctrl(dev_context, pargs);
                break;
        case BRDIOCTL_PWR_HIBERNATE:
                status = handle_hibernation_from_dsp(dev_context);
                break;
        case BRDIOCTL_PRESCALE_NOTIFY:
                status = pre_scale_dsp(dev_context, pargs);
                break;
        case BRDIOCTL_POSTSCALE_NOTIFY:
                status = post_scale_dsp(dev_context, pargs);
                break;
        case BRDIOCTL_CONSTRAINT_REQUEST:
                status = handle_constraints_set(dev_context, pargs);
                break;
        default:
                status = -EPERM;
                break;
        }
        return status;
}

/*
 *  ======== bridge_dev_destroy ========
 *      Destroys the driver object.
 */
static int bridge_dev_destroy(struct bridge_dev_context *dev_ctxt)
{
        struct pg_table_attrs *pt_attrs;
        int status = 0;
        struct bridge_dev_context *dev_context = (struct bridge_dev_context *)
            dev_ctxt;
        struct cfg_hostres *host_res;
        u32 shm_size;
        struct drv_data *drv_datap = dev_get_drvdata(bridge);

        /* It should never happen */
        if (!dev_ctxt)
                return -EFAULT;

        /* first put the device to stop state */
        bridge_brd_stop(dev_context);
        if (dev_context->pt_attrs) {
                pt_attrs = dev_context->pt_attrs;
                kfree(pt_attrs->pg_info);

                if (pt_attrs->l2_tbl_alloc_va) {
                        mem_free_phys_mem((void *)pt_attrs->l2_tbl_alloc_va,
                                          pt_attrs->l2_tbl_alloc_pa,
                                          pt_attrs->l2_tbl_alloc_sz);
                }
                if (pt_attrs->l1_tbl_alloc_va) {
                        mem_free_phys_mem((void *)pt_attrs->l1_tbl_alloc_va,
                                          pt_attrs->l1_tbl_alloc_pa,
                                          pt_attrs->l1_tbl_alloc_sz);
                }
                kfree(pt_attrs);

        }

        if (dev_context->resources) {
                host_res = dev_context->resources;
                shm_size = drv_datap->shm_size;
                if (shm_size >= 0x10000) {
                        if ((host_res->mem_base[1]) &&
                            (host_res->mem_phys[1])) {
                                mem_free_phys_mem((void *)
                                                  host_res->mem_base
                                                  [1],
                                                  host_res->mem_phys
                                                  [1], shm_size);
                        }
                } else {
                        dev_dbg(bridge, "%s: Error getting shm size "
                                "from registry: %x. Not calling "
                                "mem_free_phys_mem\n", __func__,
                                status);
                }
                host_res->mem_base[1] = 0;
                host_res->mem_phys[1] = 0;

                if (host_res->mem_base[0])
                        iounmap((void *)host_res->mem_base[0]);
                if (host_res->mem_base[2])
                        iounmap((void *)host_res->mem_base[2]);
                if (host_res->mem_base[3])
                        iounmap((void *)host_res->mem_base[3]);
                if (host_res->mem_base[4])
                        iounmap((void *)host_res->mem_base[4]);
                if (host_res->dmmu_base)
                        iounmap(host_res->dmmu_base);
                if (host_res->per_base)
                        iounmap(host_res->per_base);
                if (host_res->per_pm_base)
                        iounmap((void *)host_res->per_pm_base);
                if (host_res->core_pm_base)
                        iounmap((void *)host_res->core_pm_base);

                host_res->mem_base[0] = (u32) NULL;
                host_res->mem_base[2] = (u32) NULL;
                host_res->mem_base[3] = (u32) NULL;
                host_res->mem_base[4] = (u32) NULL;
                host_res->dmmu_base = NULL;

                kfree(host_res);
        }

        /* Free the driver's device context: */
        kfree(drv_datap->base_img);
        kfree((void *)dev_ctxt);
        return status;
}

static int bridge_brd_mem_copy(struct bridge_dev_context *dev_ctxt,
                                   u32 dsp_dest_addr, u32 dsp_src_addr,
                                   u32 ul_num_bytes, u32 mem_type)
{
        int status = 0;
        u32 src_addr = dsp_src_addr;
        u32 dest_addr = dsp_dest_addr;
        u32 copy_bytes = 0;
        u32 total_bytes = ul_num_bytes;
        u8 host_buf[BUFFERSIZE];
        struct bridge_dev_context *dev_context = dev_ctxt;
        while (total_bytes > 0 && !status) {
                copy_bytes =
                    total_bytes > BUFFERSIZE ? BUFFERSIZE : total_bytes;
                /* Read from External memory */
                status = read_ext_dsp_data(dev_ctxt, host_buf, src_addr,
                                           copy_bytes, mem_type);
                if (!status) {
                        if (dest_addr < (dev_context->dsp_start_add +
                                         dev_context->internal_size)) {
                                /* Write to Internal memory */
                                status = write_dsp_data(dev_ctxt, host_buf,
                                                        dest_addr, copy_bytes,
                                                        mem_type);
                        } else {
                                /* Write to External memory */
                                status =
                                    write_ext_dsp_data(dev_ctxt, host_buf,
                                                       dest_addr, copy_bytes,
                                                       mem_type, false);
                        }
                }
                total_bytes -= copy_bytes;
                src_addr += copy_bytes;
                dest_addr += copy_bytes;
        }
        return status;
}

/* Mem Write does not halt the DSP to write unlike bridge_brd_write */
static int bridge_brd_mem_write(struct bridge_dev_context *dev_ctxt,
                                    u8 *host_buff, u32 dsp_addr,
                                    u32 ul_num_bytes, u32 mem_type)
{
        int status = 0;
        struct bridge_dev_context *dev_context = dev_ctxt;
        u32 ul_remain_bytes = 0;
        u32 ul_bytes = 0;
        ul_remain_bytes = ul_num_bytes;
        while (ul_remain_bytes > 0 && !status) {
                ul_bytes =
                    ul_remain_bytes > BUFFERSIZE ? BUFFERSIZE : ul_remain_bytes;
                if (dsp_addr < (dev_context->dsp_start_add +
                                 dev_context->internal_size)) {
                        status =
                            write_dsp_data(dev_ctxt, host_buff, dsp_addr,
                                           ul_bytes, mem_type);
                } else {
                        status = write_ext_dsp_data(dev_ctxt, host_buff,
                                                    dsp_addr, ul_bytes,
                                                    mem_type, true);
                }
                ul_remain_bytes -= ul_bytes;
                dsp_addr += ul_bytes;
                host_buff = host_buff + ul_bytes;
        }
        return status;
}

/*
 *  ======== bridge_brd_mem_map ========
 *      This function maps MPU buffer to the DSP address space. It performs
 *  linear to physical address translation if required. It translates each
 *  page since linear addresses can be physically non-contiguous
 *  All address & size arguments are assumed to be page aligned (in proc.c)
 *
 *  TODO: Disable MMU while updating the page tables (but that'll stall DSP)
 */
static int bridge_brd_mem_map(struct bridge_dev_context *dev_ctxt,
                                  u32 ul_mpu_addr, u32 virt_addr,
                                  u32 ul_num_bytes, u32 ul_map_attr,
                                  struct page **mapped_pages)
{
        u32 attrs;
        int status = 0;
        struct bridge_dev_context *dev_context = dev_ctxt;
        struct hw_mmu_map_attrs_t hw_attrs;
        struct vm_area_struct *vma;
        struct mm_struct *mm = current->mm;
        u32 write = 0;
        u32 num_usr_pgs = 0;
        struct page *mapped_page, *pg;
        s32 pg_num;
        u32 va = virt_addr;
        struct task_struct *curr_task = current;
        u32 pg_i = 0;
        u32 mpu_addr, pa;

        dev_dbg(bridge,
                "%s hDevCtxt %p, pa %x, va %x, size %x, ul_map_attr %x\n",
                __func__, dev_ctxt, ul_mpu_addr, virt_addr, ul_num_bytes,
                ul_map_attr);
        if (ul_num_bytes == 0)
                return -EINVAL;

        if (ul_map_attr & DSP_MAP_DIR_MASK) {
                attrs = ul_map_attr;
        } else {
                /* Assign default attributes */
                attrs = ul_map_attr | (DSP_MAPVIRTUALADDR | DSP_MAPELEMSIZE16);
        }
        /* Take mapping properties */
        if (attrs & DSP_MAPBIGENDIAN)
                hw_attrs.endianism = HW_BIG_ENDIAN;
        else
                hw_attrs.endianism = HW_LITTLE_ENDIAN;

        hw_attrs.mixed_size = (enum hw_mmu_mixed_size_t)
            ((attrs & DSP_MAPMIXEDELEMSIZE) >> 2);
        /* Ignore element_size if mixed_size is enabled */
        if (hw_attrs.mixed_size == 0) {
                if (attrs & DSP_MAPELEMSIZE8) {
                        /* Size is 8 bit */
                        hw_attrs.element_size = HW_ELEM_SIZE8BIT;
                } else if (attrs & DSP_MAPELEMSIZE16) {
                        /* Size is 16 bit */
                        hw_attrs.element_size = HW_ELEM_SIZE16BIT;
                } else if (attrs & DSP_MAPELEMSIZE32) {
                        /* Size is 32 bit */
                        hw_attrs.element_size = HW_ELEM_SIZE32BIT;
                } else if (attrs & DSP_MAPELEMSIZE64) {
                        /* Size is 64 bit */
                        hw_attrs.element_size = HW_ELEM_SIZE64BIT;
                } else {
                        /*
                         * Mixedsize isn't enabled, so size can't be
                         * zero here
                         */
                        return -EINVAL;
                }
        }
        if (attrs & DSP_MAPDONOTLOCK)
                hw_attrs.donotlockmpupage = 1;
        else
                hw_attrs.donotlockmpupage = 0;

        if (attrs & DSP_MAPVMALLOCADDR) {
                return mem_map_vmalloc(dev_ctxt, ul_mpu_addr, virt_addr,
                                       ul_num_bytes, &hw_attrs);
        }
        /*
         * Do OS-specific user-va to pa translation.
         * Combine physically contiguous regions to reduce TLBs.
         * Pass the translated pa to pte_update.
         */
        if ((attrs & DSP_MAPPHYSICALADDR)) {
                status = pte_update(dev_context, ul_mpu_addr, virt_addr,
                                    ul_num_bytes, &hw_attrs);
                goto func_cont;
        }

        /*
         * Important Note: ul_mpu_addr is mapped from user application process
         * to current process - it must lie completely within the current
         * virtual memory address space in order to be of use to us here!
         */
        down_read(&mm->mmap_sem);
        vma = find_vma(mm, ul_mpu_addr);
        if (vma)
                dev_dbg(bridge,
                        "VMAfor UserBuf: ul_mpu_addr=%x, ul_num_bytes=%x, "
                        "vm_start=%lx, vm_end=%lx, vm_flags=%lx\n", ul_mpu_addr,
                        ul_num_bytes, vma->vm_start, vma->vm_end,
                        vma->vm_flags);

        /*
         * It is observed that under some circumstances, the user buffer is
         * spread across several VMAs. So loop through and check if the entire
         * user buffer is covered
         */
        while ((vma) && (ul_mpu_addr + ul_num_bytes > vma->vm_end)) {
                /* jump to the next VMA region */
                vma = find_vma(mm, vma->vm_end + 1);
                dev_dbg(bridge,
                        "VMA for UserBuf ul_mpu_addr=%x ul_num_bytes=%x, "
                        "vm_start=%lx, vm_end=%lx, vm_flags=%lx\n", ul_mpu_addr,
                        ul_num_bytes, vma->vm_start, vma->vm_end,
                        vma->vm_flags);
        }
        if (!vma) {
                pr_err("%s: Failed to get VMA region for 0x%x (%d)\n",
                       __func__, ul_mpu_addr, ul_num_bytes);
                status = -EINVAL;
                up_read(&mm->mmap_sem);
                goto func_cont;
        }

        if (vma->vm_flags & VM_IO) {
                num_usr_pgs = ul_num_bytes / PG_SIZE4K;
                mpu_addr = ul_mpu_addr;

                /* Get the physical addresses for user buffer */
                for (pg_i = 0; pg_i < num_usr_pgs; pg_i++) {
                        pa = user_va2_pa(mm, mpu_addr);
                        if (!pa) {
                                status = -EPERM;
                                pr_err("DSPBRIDGE: VM_IO mapping physical"
                                       "address is invalid\n");
                                break;
                        }
                        if (pfn_valid(__phys_to_pfn(pa))) {
                                pg = PHYS_TO_PAGE(pa);
                                get_page(pg);
                                if (page_count(pg) < 1) {
                                        pr_err("Bad page in VM_IO buffer\n");
                                        bad_page_dump(pa, pg);
                                }
                        }
                        status = pte_set(dev_context->pt_attrs, pa,
                                         va, HW_PAGE_SIZE4KB, &hw_attrs);
                        if (status)
                                break;

                        va += HW_PAGE_SIZE4KB;
                        mpu_addr += HW_PAGE_SIZE4KB;
                        pa += HW_PAGE_SIZE4KB;
                }
        } else {
                num_usr_pgs = ul_num_bytes / PG_SIZE4K;
                if (vma->vm_flags & (VM_WRITE | VM_MAYWRITE))
                        write = 1;

                for (pg_i = 0; pg_i < num_usr_pgs; pg_i++) {
                        pg_num = get_user_pages(curr_task, mm, ul_mpu_addr, 1,
                                                write, 1, &mapped_page, NULL);
                        if (pg_num > 0) {
                                if (page_count(mapped_page) < 1) {
                                        pr_err("Bad page count after doing"
                                               "get_user_pages on"
                                               "user buffer\n");
                                        bad_page_dump(page_to_phys(mapped_page),
                                                      mapped_page);
                                }
                                status = pte_set(dev_context->pt_attrs,
                                                 page_to_phys(mapped_page), va,
                                                 HW_PAGE_SIZE4KB, &hw_attrs);
                                if (status)
                                        break;

                                if (mapped_pages)
                                        mapped_pages[pg_i] = mapped_page;

                                va += HW_PAGE_SIZE4KB;
                                ul_mpu_addr += HW_PAGE_SIZE4KB;
                        } else {
                                pr_err("DSPBRIDGE: get_user_pages FAILED,"
                                       "MPU addr = 0x%x,"
                                       "vma->vm_flags = 0x%lx,"
                                       "get_user_pages Err"
                                       "Value = %d, Buffer"
                                       "size=0x%x\n", ul_mpu_addr,
                                       vma->vm_flags, pg_num, ul_num_bytes);
                                status = -EPERM;
                                break;
                        }
                }
        }
        up_read(&mm->mmap_sem);
func_cont:
        if (status) {
                /*
                 * Roll out the mapped pages incase it failed in middle of
                 * mapping
                 */
                if (pg_i) {
                        bridge_brd_mem_un_map(dev_context, virt_addr,
                                           (pg_i * PG_SIZE4K));
                }
                status = -EPERM;
        }
        /*
         * In any case, flush the TLB
         * This is called from here instead from pte_update to avoid unnecessary
         * repetition while mapping non-contiguous physical regions of a virtual
         * region
         */
        flush_all(dev_context);
        dev_dbg(bridge, "%s status %x\n", __func__, status);
        return status;
}

/*
 *  ======== bridge_brd_mem_un_map ========
 *      Invalidate the PTEs for the DSP VA block to be unmapped.
 *
 *      PTEs of a mapped memory block are contiguous in any page table
 *      So, instead of looking up the PTE address for every 4K block,
 *      we clear consecutive PTEs until we unmap all the bytes
 */
static int bridge_brd_mem_un_map(struct bridge_dev_context *dev_ctxt,
                                     u32 virt_addr, u32 ul_num_bytes)
{
        u32 l1_base_va;
        u32 l2_base_va;
        u32 l2_base_pa;
        u32 l2_page_num;
        u32 pte_val;
        u32 pte_size;
        u32 pte_count;
        u32 pte_addr_l1;
        u32 pte_addr_l2 = 0;
        u32 rem_bytes;
        u32 rem_bytes_l2;
        u32 va_curr;
        struct page *pg = NULL;
        int status = 0;
        struct bridge_dev_context *dev_context = dev_ctxt;
        struct pg_table_attrs *pt = dev_context->pt_attrs;
        u32 temp;
        u32 paddr;
        u32 numof4k_pages = 0;

        va_curr = virt_addr;
        rem_bytes = ul_num_bytes;
        rem_bytes_l2 = 0;
        l1_base_va = pt->l1_base_va;
        pte_addr_l1 = hw_mmu_pte_addr_l1(l1_base_va, va_curr);
        dev_dbg(bridge, "%s dev_ctxt %p, va %x, NumBytes %x l1_base_va %x, "
                "pte_addr_l1 %x\n", __func__, dev_ctxt, virt_addr,
                ul_num_bytes, l1_base_va, pte_addr_l1);

        while (rem_bytes && !status) {
                u32 va_curr_orig = va_curr;
                /* Find whether the L1 PTE points to a valid L2 PT */
                pte_addr_l1 = hw_mmu_pte_addr_l1(l1_base_va, va_curr);
                pte_val = *(u32 *) pte_addr_l1;
                pte_size = hw_mmu_pte_size_l1(pte_val);

                if (pte_size != HW_MMU_COARSE_PAGE_SIZE)
                        goto skip_coarse_page;

                /*
                 * Get the L2 PA from the L1 PTE, and find
                 * corresponding L2 VA
                 */
                l2_base_pa = hw_mmu_pte_coarse_l1(pte_val);
                l2_base_va = l2_base_pa - pt->l2_base_pa + pt->l2_base_va;
                l2_page_num =
                    (l2_base_pa - pt->l2_base_pa) / HW_MMU_COARSE_PAGE_SIZE;
                /*
                 * Find the L2 PTE address from which we will start
                 * clearing, the number of PTEs to be cleared on this
                 * page, and the size of VA space that needs to be
                 * cleared on this L2 page
                 */
                pte_addr_l2 = hw_mmu_pte_addr_l2(l2_base_va, va_curr);
                pte_count = pte_addr_l2 & (HW_MMU_COARSE_PAGE_SIZE - 1);
                pte_count = (HW_MMU_COARSE_PAGE_SIZE - pte_count) / sizeof(u32);
                if (rem_bytes < (pte_count * PG_SIZE4K))
                        pte_count = rem_bytes / PG_SIZE4K;
                rem_bytes_l2 = pte_count * PG_SIZE4K;

                /*
                 * Unmap the VA space on this L2 PT. A quicker way
                 * would be to clear pte_count entries starting from
                 * pte_addr_l2. However, below code checks that we don't
                 * clear invalid entries or less than 64KB for a 64KB
                 * entry. Similar checking is done for L1 PTEs too
                 * below
                 */
                while (rem_bytes_l2 && !status) {
                        pte_val = *(u32 *) pte_addr_l2;
                        pte_size = hw_mmu_pte_size_l2(pte_val);
                        /* va_curr aligned to pte_size? */
                        if (pte_size == 0 || rem_bytes_l2 < pte_size ||
                            va_curr & (pte_size - 1)) {
                                status = -EPERM;
                                break;
                        }

                        /* Collect Physical addresses from VA */
                        paddr = (pte_val & ~(pte_size - 1));
                        if (pte_size == HW_PAGE_SIZE64KB)
                                numof4k_pages = 16;
                        else
                                numof4k_pages = 1;
                        temp = 0;
                        while (temp++ < numof4k_pages) {
                                if (!pfn_valid(__phys_to_pfn(paddr))) {
                                        paddr += HW_PAGE_SIZE4KB;
                                        continue;
                                }
                                pg = PHYS_TO_PAGE(paddr);
                                if (page_count(pg) < 1) {
                                        pr_info("DSPBRIDGE: UNMAP function: "
                                                "COUNT 0 FOR PA 0x%x, size = "
                                                "0x%x\n", paddr, ul_num_bytes);
                                        bad_page_dump(paddr, pg);
                                } else {
                                        set_page_dirty(pg);
                                        page_cache_release(pg);
                                }
                                paddr += HW_PAGE_SIZE4KB;
                        }
                        if (hw_mmu_pte_clear(pte_addr_l2, va_curr, pte_size)) {
                                status = -EPERM;
                                goto EXIT_LOOP;
                        }

                        status = 0;
                        rem_bytes_l2 -= pte_size;
                        va_curr += pte_size;
                        pte_addr_l2 += (pte_size >> 12) * sizeof(u32);
                }
                spin_lock(&pt->pg_lock);
                if (rem_bytes_l2 == 0) {
                        pt->pg_info[l2_page_num].num_entries -= pte_count;
                        if (pt->pg_info[l2_page_num].num_entries == 0) {
                                /*
                                 * Clear the L1 PTE pointing to the L2 PT
                                 */
                                if (!hw_mmu_pte_clear(l1_base_va, va_curr_orig,
                                                     HW_MMU_COARSE_PAGE_SIZE))
                                        status = 0;
                                else {
                                        status = -EPERM;
                                        spin_unlock(&pt->pg_lock);
                                        goto EXIT_LOOP;
                                }
                        }
                        rem_bytes -= pte_count * PG_SIZE4K;
                } else
                        status = -EPERM;

                spin_unlock(&pt->pg_lock);
                continue;
skip_coarse_page:
                /* va_curr aligned to pte_size? */
                /* pte_size = 1 MB or 16 MB */
                if (pte_size == 0 || rem_bytes < pte_size ||
                    va_curr & (pte_size - 1)) {
                        status = -EPERM;
                        break;
                }

                if (pte_size == HW_PAGE_SIZE1MB)
                        numof4k_pages = 256;
                else
                        numof4k_pages = 4096;
                temp = 0;
                /* Collect Physical addresses from VA */
                paddr = (pte_val & ~(pte_size - 1));
                while (temp++ < numof4k_pages) {
                        if (pfn_valid(__phys_to_pfn(paddr))) {
                                pg = PHYS_TO_PAGE(paddr);
                                if (page_count(pg) < 1) {
                                        pr_info("DSPBRIDGE: UNMAP function: "
                                                "COUNT 0 FOR PA 0x%x, size = "
                                                "0x%x\n", paddr, ul_num_bytes);
                                        bad_page_dump(paddr, pg);
                                } else {
                                        set_page_dirty(pg);
                                        page_cache_release(pg);
                                }
                        }
                        paddr += HW_PAGE_SIZE4KB;
                }
                if (!hw_mmu_pte_clear(l1_base_va, va_curr, pte_size)) {
                        status = 0;
                        rem_bytes -= pte_size;
                        va_curr += pte_size;
                } else {
                        status = -EPERM;
                        goto EXIT_LOOP;
                }
        }
        /*
         * It is better to flush the TLB here, so that any stale old entries
         * get flushed
         */
EXIT_LOOP:
        flush_all(dev_context);
        dev_dbg(bridge,
                "%s: va_curr %x, pte_addr_l1 %x pte_addr_l2 %x rem_bytes %x,"
                " rem_bytes_l2 %x status %x\n", __func__, va_curr, pte_addr_l1,
                pte_addr_l2, rem_bytes, rem_bytes_l2, status);
        return status;
}

/*
 *  ======== user_va2_pa ========
 *  Purpose:
 *      This function walks through the page tables to convert a userland
 *      virtual address to physical address
 */
static u32 user_va2_pa(struct mm_struct *mm, u32 address)
{
        pgd_t *pgd;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *ptep, pte;

        pgd = pgd_offset(mm, address);
        if (pgd_none(*pgd) || pgd_bad(*pgd))
                return 0;

        pud = pud_offset(pgd, address);
        if (pud_none(*pud) || pud_bad(*pud))
                return 0;

        pmd = pmd_offset(pud, address);
        if (pmd_none(*pmd) || pmd_bad(*pmd))
                return 0;

        ptep = pte_offset_map(pmd, address);
        if (ptep) {
                pte = *ptep;
                if (pte_present(pte))
                        return pte & PAGE_MASK;
        }

        return 0;
}

/*
 *  ======== pte_update ========
 *      This function calculates the optimum page-aligned addresses and sizes
 *      Caller must pass page-aligned values
 */
static int pte_update(struct bridge_dev_context *dev_ctxt, u32 pa,
                             u32 va, u32 size,
                             struct hw_mmu_map_attrs_t *map_attrs)
{
        u32 i;
        u32 all_bits;
        u32 pa_curr = pa;
        u32 va_curr = va;
        u32 num_bytes = size;
        struct bridge_dev_context *dev_context = dev_ctxt;
        int status = 0;
        u32 page_size[] = { HW_PAGE_SIZE16MB, HW_PAGE_SIZE1MB,
                HW_PAGE_SIZE64KB, HW_PAGE_SIZE4KB
        };

        while (num_bytes && !status) {
                /* To find the max. page size with which both PA & VA are
                 * aligned */
                all_bits = pa_curr | va_curr;

                for (i = 0; i < 4; i++) {
                        if ((num_bytes >= page_size[i]) && ((all_bits &
                                                             (page_size[i] -
                                                              1)) == 0)) {
                                status =
                                    pte_set(dev_context->pt_attrs, pa_curr,
                                            va_curr, page_size[i], map_attrs);
                                pa_curr += page_size[i];
                                va_curr += page_size[i];
                                num_bytes -= page_size[i];
                                /* Don't try smaller sizes. Hopefully we have
                                 * reached an address aligned to a bigger page
                                 * size */
                                break;
                        }
                }
        }

        return status;
}

/*
 *  ======== pte_set ========
 *      This function calculates PTE address (MPU virtual) to be updated
 *      It also manages the L2 page tables
 */
static int pte_set(struct pg_table_attrs *pt, u32 pa, u32 va,
                          u32 size, struct hw_mmu_map_attrs_t *attrs)
{
        u32 i;
        u32 pte_val;
        u32 pte_addr_l1;
        u32 pte_size;
        /* Base address of the PT that will be updated */
        u32 pg_tbl_va;
        u32 l1_base_va;
        /* Compiler warns that the next three variables might be used
         * uninitialized in this function. Doesn't seem so. Working around,
         * anyways. */
        u32 l2_base_va = 0;
        u32 l2_base_pa = 0;
        u32 l2_page_num = 0;
        int status = 0;

        l1_base_va = pt->l1_base_va;
        pg_tbl_va = l1_base_va;
        if ((size == HW_PAGE_SIZE64KB) || (size == HW_PAGE_SIZE4KB)) {
                /* Find whether the L1 PTE points to a valid L2 PT */
                pte_addr_l1 = hw_mmu_pte_addr_l1(l1_base_va, va);
                if (pte_addr_l1 <= (pt->l1_base_va + pt->l1_size)) {
                        pte_val = *(u32 *) pte_addr_l1;
                        pte_size = hw_mmu_pte_size_l1(pte_val);
                } else {
                        return -EPERM;
                }
                spin_lock(&pt->pg_lock);
                if (pte_size == HW_MMU_COARSE_PAGE_SIZE) {
                        /* Get the L2 PA from the L1 PTE, and find
                         * corresponding L2 VA */
                        l2_base_pa = hw_mmu_pte_coarse_l1(pte_val);
                        l2_base_va =
                            l2_base_pa - pt->l2_base_pa + pt->l2_base_va;
                        l2_page_num =
                            (l2_base_pa -
                             pt->l2_base_pa) / HW_MMU_COARSE_PAGE_SIZE;
                } else if (pte_size == 0) {
                        /* L1 PTE is invalid. Allocate a L2 PT and
                         * point the L1 PTE to it */
                        /* Find a free L2 PT. */
                        for (i = 0; (i < pt->l2_num_pages) &&
                             (pt->pg_info[i].num_entries != 0); i++)
                                ;
                        if (i < pt->l2_num_pages) {
                                l2_page_num = i;
                                l2_base_pa = pt->l2_base_pa + (l2_page_num *
                                                HW_MMU_COARSE_PAGE_SIZE);
                                l2_base_va = pt->l2_base_va + (l2_page_num *
                                                HW_MMU_COARSE_PAGE_SIZE);
                                /* Endianness attributes are ignored for
                                 * HW_MMU_COARSE_PAGE_SIZE */
                                status =
                                    hw_mmu_pte_set(l1_base_va, l2_base_pa, va,
                                                   HW_MMU_COARSE_PAGE_SIZE,
                                                   attrs);
                        } else {
                                status = -ENOMEM;
                        }
                } else {
                        /* Found valid L1 PTE of another size.
                         * Should not overwrite it. */
                        status = -EPERM;
                }
                if (!status) {
                        pg_tbl_va = l2_base_va;
                        if (size == HW_PAGE_SIZE64KB)
                                pt->pg_info[l2_page_num].num_entries += 16;
                        else
                                pt->pg_info[l2_page_num].num_entries++;
                        dev_dbg(bridge, "PTE: L2 BaseVa %x, BasePa %x, PageNum "
                                "%x, num_entries %x\n", l2_base_va,
                                l2_base_pa, l2_page_num,
                                pt->pg_info[l2_page_num].num_entries);
                }
                spin_unlock(&pt->pg_lock);
        }
        if (!status) {
                dev_dbg(bridge, "PTE: pg_tbl_va %x, pa %x, va %x, size %x\n",
                        pg_tbl_va, pa, va, size);
                dev_dbg(bridge, "PTE: endianism %x, element_size %x, "
                        "mixed_size %x\n", attrs->endianism,
                        attrs->element_size, attrs->mixed_size);
                status = hw_mmu_pte_set(pg_tbl_va, pa, va, size, attrs);
        }

        return status;
}

/* Memory map kernel VA -- memory allocated with vmalloc */
static int mem_map_vmalloc(struct bridge_dev_context *dev_context,
                                  u32 ul_mpu_addr, u32 virt_addr,
                                  u32 ul_num_bytes,
                                  struct hw_mmu_map_attrs_t *hw_attrs)
{
        int status = 0;
        struct page *page[1];
        u32 i;
        u32 pa_curr;
        u32 pa_next;
        u32 va_curr;
        u32 size_curr;
        u32 num_pages;
        u32 pa;
        u32 num_of4k_pages;
        u32 temp = 0;

        /*
         * Do Kernel va to pa translation.
         * Combine physically contiguous regions to reduce TLBs.
         * Pass the translated pa to pte_update.
         */
        num_pages = ul_num_bytes / PAGE_SIZE;   /* PAGE_SIZE = OS page size */
        i = 0;
        va_curr = ul_mpu_addr;
        page[0] = vmalloc_to_page((void *)va_curr);
        pa_next = page_to_phys(page[0]);
        while (!status && (i < num_pages)) {
                /*
                 * Reuse pa_next from the previous iteration to avoid
                 * an extra va2pa call
                 */
                pa_curr = pa_next;
                size_curr = PAGE_SIZE;
                /*
                 * If the next page is physically contiguous,
                 * map it with the current one by increasing
                 * the size of the region to be mapped
                 */
                while (++i < num_pages) {
                        page[0] =
                            vmalloc_to_page((void *)(va_curr + size_curr));
                        pa_next = page_to_phys(page[0]);

                        if (pa_next == (pa_curr + size_curr))
                                size_curr += PAGE_SIZE;
                        else
                                break;

                }
                if (pa_next == 0) {
                        status = -ENOMEM;
                        break;
                }
                pa = pa_curr;
                num_of4k_pages = size_curr / HW_PAGE_SIZE4KB;
                while (temp++ < num_of4k_pages) {
                        get_page(PHYS_TO_PAGE(pa));
                        pa += HW_PAGE_SIZE4KB;
                }
                status = pte_update(dev_context, pa_curr, virt_addr +
                                    (va_curr - ul_mpu_addr), size_curr,
                                    hw_attrs);
                va_curr += size_curr;
        }
        /*
         * In any case, flush the TLB
         * This is called from here instead from pte_update to avoid unnecessary
         * repetition while mapping non-contiguous physical regions of a virtual
         * region
         */
        flush_all(dev_context);
        dev_dbg(bridge, "%s status %x\n", __func__, status);
        return status;
}

/*
 *  ======== wait_for_start ========
 *      Wait for the singal from DSP that it has started, or time out.
 */
bool wait_for_start(struct bridge_dev_context *dev_context,
                        void __iomem *sync_addr)
{
        u16 timeout = TIHELEN_ACKTIMEOUT;

        /*  Wait for response from board */
        while (__raw_readw(sync_addr) && --timeout)
                udelay(10);

        /*  If timed out: return false */
        if (!timeout) {
                pr_err("%s: Timed out waiting DSP to Start\n", __func__);
                return false;
        }
        return true;
}