Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Common CPM code

 *

 * Author: Scott Wood <scottwood@freescale.com>

 *

 * Copyright 2007 Freescale Semiconductor, Inc.

 *

 * Some parts derived from commproc.c/cpm2_common.c, which is:

 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)

 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>

 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)

 * 2006 (c) MontaVista Software, Inc.

 * Vitaly Bordug <vbordug@ru.mvista.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 */

#include <linux/init.h>

#include <linux/of_device.h>

#include <asm/udbg.h>

#include <asm/io.h>

#include <asm/system.h>

#include <asm/rheap.h>

#include <asm/cpm.h>

#include <mm/mmu_decl.h>

#ifdef CONFIG_PPC_EARLY_DEBUG_CPM

static u32 __iomem *cpm_udbg_txdesc =

        (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;

static void udbg_putc_cpm(char c)

{

        u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);

        if (c == '\n')

                udbg_putc('\r');

        while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)

                ;

        out_8(txbuf, c);

        out_be32(&cpm_udbg_txdesc[0], 0xa0000001);

}

void __init udbg_init_cpm(void)

{

        if (cpm_udbg_txdesc) {

#ifdef CONFIG_CPM2

                setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);

#endif

                udbg_putc = udbg_putc_cpm;

                udbg_putc('X');

        }

}

#endif

#ifdef CONFIG_PPC_CPM_NEW_BINDING

static spinlock_t cpm_muram_lock;

static rh_block_t cpm_boot_muram_rh_block[16];

static rh_info_t cpm_muram_info;

static u8 __iomem *muram_vbase;

static phys_addr_t muram_pbase;

/* Max address size we deal with */

#define OF_MAX_ADDR_CELLS       4

int __init cpm_muram_init(void)

{

        struct device_node *np;

        struct resource r;

        u32 zero[OF_MAX_ADDR_CELLS] = {};

        resource_size_t max = 0;

        int i = 0;

        int ret = 0;

        spin_lock_init(&cpm_muram_lock);

        /* initialize the info header */

        rh_init(&cpm_muram_info, 1,

                sizeof(cpm_boot_muram_rh_block) /

                sizeof(cpm_boot_muram_rh_block[0]),

                cpm_boot_muram_rh_block);

        np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");

        if (!np) {

                printk(KERN_ERR "Cannot find CPM muram data node");

                ret = -ENODEV;

                goto out;

        }

        muram_pbase = of_translate_address(np, zero);

        if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {

                printk(KERN_ERR "Cannot translate zero through CPM muram node");

                ret = -ENODEV;

                goto out;

        }

        while (of_address_to_resource(np, i++, &r) == 0) {

                if (r.end > max)

                        max = r.end;

                rh_attach_region(&cpm_muram_info, r.start - muram_pbase,

                                 r.end - r.start + 1);

        }

        muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);

        if (!muram_vbase) {

                printk(KERN_ERR "Cannot map CPM muram");

                ret = -ENOMEM;

        }

out:

        of_node_put(np);

        return ret;

}

/**

 * cpm_muram_alloc - allocate the requested size worth of multi-user ram

 * @size: number of bytes to allocate

 * @align: requested alignment, in bytes

 *

 * This function returns an offset into the muram area.

 * Use cpm_dpram_addr() to get the virtual address of the area.

 * Use cpm_muram_free() to free the allocation.

 */

unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)

{

        unsigned long start;

        unsigned long flags;

        spin_lock_irqsave(&cpm_muram_lock, flags);

        cpm_muram_info.alignment = align;

        start = rh_alloc(&cpm_muram_info, size, "commproc");

        spin_unlock_irqrestore(&cpm_muram_lock, flags);

        return start;

}

EXPORT_SYMBOL(cpm_muram_alloc);

/**

 * cpm_muram_free - free a chunk of multi-user ram

 * @offset: The beginning of the chunk as returned by cpm_muram_alloc().

 */

int cpm_muram_free(unsigned long offset)

{

        int ret;

        unsigned long flags;

        spin_lock_irqsave(&cpm_muram_lock, flags);

        ret = rh_free(&cpm_muram_info, offset);

        spin_unlock_irqrestore(&cpm_muram_lock, flags);

        return ret;

}

EXPORT_SYMBOL(cpm_muram_free);

/**

 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram

 * @offset: the offset into the muram area to reserve

 * @size: the number of bytes to reserve

 *

 * This function returns "start" on success, -ENOMEM on failure.

 * Use cpm_dpram_addr() to get the virtual address of the area.

 * Use cpm_muram_free() to free the allocation.

 */

unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)

{

        unsigned long start;

        unsigned long flags;

        spin_lock_irqsave(&cpm_muram_lock, flags);

        cpm_muram_info.alignment = 1;

        start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");

        spin_unlock_irqrestore(&cpm_muram_lock, flags);

        return start;

}

EXPORT_SYMBOL(cpm_muram_alloc_fixed);

/**

 * cpm_muram_addr - turn a muram offset into a virtual address

 * @offset: muram offset to convert

 */

void __iomem *cpm_muram_addr(unsigned long offset)

{

        return muram_vbase + offset;

}

EXPORT_SYMBOL(cpm_muram_addr);

/**

 * cpm_muram_dma - turn a muram virtual address into a DMA address

 * @offset: virtual address from cpm_muram_addr() to convert

 */

dma_addr_t cpm_muram_dma(void __iomem *addr)

{

        return muram_pbase + ((u8 __iomem *)addr - muram_vbase);

}

EXPORT_SYMBOL(cpm_muram_dma);

#endif /* CONFIG_PPC_CPM_NEW_BINDING */