diff options
Diffstat (limited to 'drivers/media/pci/b2c2/flexcop-dma.c')
| -rw-r--r-- | drivers/media/pci/b2c2/flexcop-dma.c | 175 |
1 files changed, 175 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 000000000..ff8058568 --- /dev/null +++ b/drivers/media/pci/b2c2/flexcop-dma.c @@ -0,0 +1,175 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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; + } + + tcpu = dma_alloc_coherent(&pdev->dev, size, &tdma, GFP_KERNEL); + if (tcpu != 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) +{ + dma_free_coherent(&dma->pdev->dev, 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 %s call.", + __func__); + 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("transfer DMA1 or DMA2 can be started within one %s call.", + __func__); + 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); + |