1 files changed, 172 insertions, 0 deletions

diff --git a/drivers/media/pci/b2c2/flexcop-dma.c b/drivers/media/pci/b2c2/flexcop-dma.c
new file mode 100644
index 000000000000..2881e0d956ad
--- /dev/null
+++ b/drivers/media/pci/b2c2/flexcop-dma.c
@@ -0,0 +1,172 @@
+/*
+ * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
+ * flexcop-dma.c - configuring and controlling the DMA of the FlexCop
+ * see flexcop.c for copyright information
+ */
+#include "flexcop.h"
+
+int flexcop_dma_allocate(struct pci_dev *pdev,
+		struct flexcop_dma *dma, u32 size)
+{
+	u8 *tcpu;
+	dma_addr_t tdma = 0;
+
+	if (size % 2) {
+		err("dma buffersize has to be even.");
+		return -EINVAL;
+	}
+
+	if ((tcpu = pci_alloc_consistent(pdev, size, &tdma)) != NULL) {
+		dma->pdev = pdev;
+		dma->cpu_addr0 = tcpu;
+		dma->dma_addr0 = tdma;
+		dma->cpu_addr1 = tcpu + size/2;
+		dma->dma_addr1 = tdma + size/2;
+		dma->size = size/2;
+		return 0;
+	}
+	return -ENOMEM;
+}
+EXPORT_SYMBOL(flexcop_dma_allocate);
+
+void flexcop_dma_free(struct flexcop_dma *dma)
+{
+	pci_free_consistent(dma->pdev, dma->size*2,
+			dma->cpu_addr0, dma->dma_addr0);
+	memset(dma,0,sizeof(struct flexcop_dma));
+}
+EXPORT_SYMBOL(flexcop_dma_free);
+
+int flexcop_dma_config(struct flexcop_device *fc,
+		struct flexcop_dma *dma,
+		flexcop_dma_index_t dma_idx)
+{
+	flexcop_ibi_value v0x0,v0x4,v0xc;
+	v0x0.raw = v0x4.raw = v0xc.raw = 0;
+
+	v0x0.dma_0x0.dma_address0 = dma->dma_addr0 >> 2;
+	v0xc.dma_0xc.dma_address1 = dma->dma_addr1 >> 2;
+	v0x4.dma_0x4_write.dma_addr_size = dma->size / 4;
+
+	if ((dma_idx & FC_DMA_1) == dma_idx) {
+		fc->write_ibi_reg(fc,dma1_000,v0x0);
+		fc->write_ibi_reg(fc,dma1_004,v0x4);
+		fc->write_ibi_reg(fc,dma1_00c,v0xc);
+	} else if ((dma_idx & FC_DMA_2) == dma_idx) {
+		fc->write_ibi_reg(fc,dma2_010,v0x0);
+		fc->write_ibi_reg(fc,dma2_014,v0x4);
+		fc->write_ibi_reg(fc,dma2_01c,v0xc);
+	} else {
+		err("either DMA1 or DMA2 can be configured within one "
+			"flexcop_dma_config call.");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(flexcop_dma_config);
+
+/* start the DMA transfers, but not the DMA IRQs */
+int flexcop_dma_xfer_control(struct flexcop_device *fc,
+		flexcop_dma_index_t dma_idx,
+		flexcop_dma_addr_index_t index,
+		int onoff)
+{
+	flexcop_ibi_value v0x0,v0xc;
+	flexcop_ibi_register r0x0,r0xc;
+
+	if ((dma_idx & FC_DMA_1) == dma_idx) {
+		r0x0 = dma1_000;
+		r0xc = dma1_00c;
+	} else if ((dma_idx & FC_DMA_2) == dma_idx) {
+		r0x0 = dma2_010;
+		r0xc = dma2_01c;
+	} else {
+		err("either transfer DMA1 or DMA2 can be started within one "
+			"flexcop_dma_xfer_control call.");
+		return -EINVAL;
+	}
+
+	v0x0 = fc->read_ibi_reg(fc,r0x0);
+	v0xc = fc->read_ibi_reg(fc,r0xc);
+
+	deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
+	deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
+
+	if (index & FC_DMA_SUBADDR_0)
+		v0x0.dma_0x0.dma_0start = onoff;
+
+	if (index & FC_DMA_SUBADDR_1)
+		v0xc.dma_0xc.dma_1start = onoff;
+
+	fc->write_ibi_reg(fc,r0x0,v0x0);
+	fc->write_ibi_reg(fc,r0xc,v0xc);
+
+	deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
+	deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
+	return 0;
+}
+EXPORT_SYMBOL(flexcop_dma_xfer_control);
+
+static int flexcop_dma_remap(struct flexcop_device *fc,
+		flexcop_dma_index_t dma_idx,
+		int onoff)
+{
+	flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_00c : dma2_01c;
+	flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
+	deb_info("%s\n",__func__);
+	v.dma_0xc.remap_enable = onoff;
+	fc->write_ibi_reg(fc,r,v);
+	return 0;
+}
+
+int flexcop_dma_control_size_irq(struct flexcop_device *fc,
+		flexcop_dma_index_t no,
+		int onoff)
+{
+	flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
+
+	if (no & FC_DMA_1)
+		v.ctrl_208.DMA1_IRQ_Enable_sig = onoff;
+
+	if (no & FC_DMA_2)
+		v.ctrl_208.DMA2_IRQ_Enable_sig = onoff;
+
+	fc->write_ibi_reg(fc,ctrl_208,v);
+	return 0;
+}
+EXPORT_SYMBOL(flexcop_dma_control_size_irq);
+
+int flexcop_dma_control_timer_irq(struct flexcop_device *fc,
+		flexcop_dma_index_t no,
+		int onoff)
+{
+	flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
+
+	if (no & FC_DMA_1)
+		v.ctrl_208.DMA1_Timer_Enable_sig = onoff;
+
+	if (no & FC_DMA_2)
+		v.ctrl_208.DMA2_Timer_Enable_sig = onoff;
+
+	fc->write_ibi_reg(fc,ctrl_208,v);
+	return 0;
+}
+EXPORT_SYMBOL(flexcop_dma_control_timer_irq);
+
+/* 1 cycles = 1.97 msec */
+int flexcop_dma_config_timer(struct flexcop_device *fc,
+		flexcop_dma_index_t dma_idx, u8 cycles)
+{
+	flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014;
+	flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
+
+	flexcop_dma_remap(fc,dma_idx,0);
+
+	deb_info("%s\n",__func__);
+	v.dma_0x4_write.dmatimer = cycles;
+	fc->write_ibi_reg(fc,r,v);
+	return 0;
+}
+EXPORT_SYMBOL(flexcop_dma_config_timer);
+