// SPDX-License-Identifier: GPL-2.0-or-later
/*

    btcx-risc.c

    bt848/bt878/cx2388x risc code generator.

    (c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]


*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/videodev2.h>
#include <linux/pgtable.h>
#include <asm/page.h>

#include "btcx-risc.h"

static unsigned int btcx_debug;
module_param(btcx_debug, int, 0644);
MODULE_PARM_DESC(btcx_debug,"debug messages, default is 0 (no)");

#define dprintk(fmt, arg...) do {                               \
        if (btcx_debug)                                         \
                printk(KERN_DEBUG pr_fmt("%s: " fmt),           \
                       __func__, ##arg);                        \
} while (0)


/* ---------------------------------------------------------- */
/* allocate/free risc memory                                  */

static int memcnt;

void btcx_riscmem_free(struct pci_dev *pci,
                       struct btcx_riscmem *risc)
{
        if (NULL == risc->cpu)
                return;

        memcnt--;
        dprintk("btcx: riscmem free [%d] dma=%lx\n",
                memcnt, (unsigned long)risc->dma);

        dma_free_coherent(&pci->dev, risc->size, risc->cpu, risc->dma);
        memset(risc,0,sizeof(*risc));
}

int btcx_riscmem_alloc(struct pci_dev *pci,
                       struct btcx_riscmem *risc,
                       unsigned int size)
{
        __le32 *cpu;
        dma_addr_t dma = 0;

        if (NULL != risc->cpu && risc->size < size)
                btcx_riscmem_free(pci,risc);
        if (NULL == risc->cpu) {
                cpu = dma_alloc_coherent(&pci->dev, size, &dma, GFP_KERNEL);
                if (NULL == cpu)
                        return -ENOMEM;
                risc->cpu  = cpu;
                risc->dma  = dma;
                risc->size = size;

                memcnt++;
                dprintk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
                        memcnt, (unsigned long)dma, cpu, size);
        }
        return 0;
}