1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/media/pci/bt8xx/btcx-risc.c b/drivers/media/pci/bt8xx/btcx-risc.c
new file mode 100644
index 0000000000..0adbf8233e
--- /dev/null
+++ b/drivers/media/pci/bt8xx/btcx-risc.c
@@ -0,0 +1,77 @@
+// 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;
+}