LXR linux/drivers/media/pci/b2c2/flexcop-dma.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
   4 * flexcop-dma.c - configuring and controlling the DMA of the FlexCop
   5 * see flexcop.c for copyright information
   6 */
   7#include "flexcop.h"
   8
   9int flexcop_dma_allocate(struct pci_dev *pdev,
  10                struct flexcop_dma *dma, u32 size)
  11{
  12        u8 *tcpu;
  13        dma_addr_t tdma = 0;
  14
  15        if (size % 2) {
  16                err("dma buffersize has to be even.");
  17                return -EINVAL;
  18        }
  19
  20        if ((tcpu = pci_alloc_consistent(pdev, size, &tdma)) != NULL) {
  21                dma->pdev = pdev;
  22                dma->cpu_addr0 = tcpu;
  23                dma->dma_addr0 = tdma;
  24                dma->cpu_addr1 = tcpu + size/2;
  25                dma->dma_addr1 = tdma + size/2;
  26                dma->size = size/2;
  27                return 0;
  28        }
  29        return -ENOMEM;
  30}
  31EXPORT_SYMBOL(flexcop_dma_allocate);
  32
  33void flexcop_dma_free(struct flexcop_dma *dma)
  34{
  35        pci_free_consistent(dma->pdev, dma->size*2,
  36                        dma->cpu_addr0, dma->dma_addr0);
  37        memset(dma,0,sizeof(struct flexcop_dma));
  38}
  39EXPORT_SYMBOL(flexcop_dma_free);
  40
  41int flexcop_dma_config(struct flexcop_device *fc,
  42                struct flexcop_dma *dma,
  43                flexcop_dma_index_t dma_idx)
  44{
  45        flexcop_ibi_value v0x0,v0x4,v0xc;
  46        v0x0.raw = v0x4.raw = v0xc.raw = 0;
  47
  48        v0x0.dma_0x0.dma_address0 = dma->dma_addr0 >> 2;
  49        v0xc.dma_0xc.dma_address1 = dma->dma_addr1 >> 2;
  50        v0x4.dma_0x4_write.dma_addr_size = dma->size / 4;
  51
  52        if ((dma_idx & FC_DMA_1) == dma_idx) {
  53                fc->write_ibi_reg(fc,dma1_000,v0x0);
  54                fc->write_ibi_reg(fc,dma1_004,v0x4);
  55                fc->write_ibi_reg(fc,dma1_00c,v0xc);
  56        } else if ((dma_idx & FC_DMA_2) == dma_idx) {
  57                fc->write_ibi_reg(fc,dma2_010,v0x0);
  58                fc->write_ibi_reg(fc,dma2_014,v0x4);
  59                fc->write_ibi_reg(fc,dma2_01c,v0xc);
  60        } else {
  61                err("either DMA1 or DMA2 can be configured within one flexcop_dma_config call.");
  62                return -EINVAL;
  63        }
  64
  65        return 0;
  66}
  67EXPORT_SYMBOL(flexcop_dma_config);
  68
  69/* start the DMA transfers, but not the DMA IRQs */
  70int flexcop_dma_xfer_control(struct flexcop_device *fc,
  71                flexcop_dma_index_t dma_idx,
  72                flexcop_dma_addr_index_t index,
  73                int onoff)
  74{
  75        flexcop_ibi_value v0x0,v0xc;
  76        flexcop_ibi_register r0x0,r0xc;
  77
  78        if ((dma_idx & FC_DMA_1) == dma_idx) {
  79                r0x0 = dma1_000;
  80                r0xc = dma1_00c;
  81        } else if ((dma_idx & FC_DMA_2) == dma_idx) {
  82                r0x0 = dma2_010;
  83                r0xc = dma2_01c;
  84        } else {
  85                err("either transfer DMA1 or DMA2 can be started within one flexcop_dma_xfer_control call.");
  86                return -EINVAL;
  87        }
  88
  89        v0x0 = fc->read_ibi_reg(fc,r0x0);
  90        v0xc = fc->read_ibi_reg(fc,r0xc);
  91
  92        deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
  93        deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
  94
  95        if (index & FC_DMA_SUBADDR_0)
  96                v0x0.dma_0x0.dma_0start = onoff;
  97
  98        if (index & FC_DMA_SUBADDR_1)
  99                v0xc.dma_0xc.dma_1start = onoff;
 100
 101        fc->write_ibi_reg(fc,r0x0,v0x0);
 102        fc->write_ibi_reg(fc,r0xc,v0xc);
 103
 104        deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
 105        deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
 106        return 0;
 107}
 108EXPORT_SYMBOL(flexcop_dma_xfer_control);
 109
 110static int flexcop_dma_remap(struct flexcop_device *fc,
 111                flexcop_dma_index_t dma_idx,
 112                int onoff)
 113{
 114        flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_00c : dma2_01c;
 115        flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 116        deb_info("%s\n",__func__);
 117        v.dma_0xc.remap_enable = onoff;
 118        fc->write_ibi_reg(fc,r,v);
 119        return 0;
 120}
 121
 122int flexcop_dma_control_size_irq(struct flexcop_device *fc,
 123                flexcop_dma_index_t no,
 124                int onoff)
 125{
 126        flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
 127
 128        if (no & FC_DMA_1)
 129                v.ctrl_208.DMA1_IRQ_Enable_sig = onoff;
 130
 131        if (no & FC_DMA_2)
 132                v.ctrl_208.DMA2_IRQ_Enable_sig = onoff;
 133
 134        fc->write_ibi_reg(fc,ctrl_208,v);
 135        return 0;
 136}
 137EXPORT_SYMBOL(flexcop_dma_control_size_irq);
 138
 139int flexcop_dma_control_timer_irq(struct flexcop_device *fc,
 140                flexcop_dma_index_t no,
 141                int onoff)
 142{
 143        flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
 144
 145        if (no & FC_DMA_1)
 146                v.ctrl_208.DMA1_Timer_Enable_sig = onoff;
 147
 148        if (no & FC_DMA_2)
 149                v.ctrl_208.DMA2_Timer_Enable_sig = onoff;
 150
 151        fc->write_ibi_reg(fc,ctrl_208,v);
 152        return 0;
 153}
 154EXPORT_SYMBOL(flexcop_dma_control_timer_irq);
 155
 156/* 1 cycles = 1.97 msec */
 157int flexcop_dma_config_timer(struct flexcop_device *fc,
 158                flexcop_dma_index_t dma_idx, u8 cycles)
 159{
 160        flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014;
 161        flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 162
 163        flexcop_dma_remap(fc,dma_idx,0);
 164
 165        deb_info("%s\n",__func__);
 166        v.dma_0x4_write.dmatimer = cycles;
 167        fc->write_ibi_reg(fc,r,v);
 168        return 0;
 169}
 170EXPORT_SYMBOL(flexcop_dma_config_timer);
 171
 172