147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/*******************************************************************************
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This is the driver for the MAC 10/100 on-chip Ethernet controller
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currently tested on all the ST boards based on STb7109 and stx7200 SoCs.
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DWC Ether MAC 10/100 Universal version 4.0 has been used for developing
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this code.
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This contains the functions to handle the dma.
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Copyright (C) 2007-2009 STMicroelectronics Ltd
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#include <asm/io.h>
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#include "dwmac100.h"
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#include "dwmac_dma.h"
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static int dwmac100_dma_init(void __iomem *ioaddr, int pbl, int fb, int mb,
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int burst_len, u32 dma_tx, u32 dma_rx, int atds)
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{
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u32 value = readl(ioaddr + DMA_BUS_MODE);
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int limit;
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/* DMA SW reset */
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value |= DMA_BUS_MODE_SFT_RESET;
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writel(value, ioaddr + DMA_BUS_MODE);
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limit = 10;
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while (limit--) {
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if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
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break;
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mdelay(10);
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}
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if (limit < 0)
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return -EBUSY;
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/* Enable Application Access by writing to DMA CSR0 */
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writel(DMA_BUS_MODE_DEFAULT | (pbl << DMA_BUS_MODE_PBL_SHIFT),
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ioaddr + DMA_BUS_MODE);
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/* Mask interrupts by writing to CSR7 */
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writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
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/* RX/TX descriptor base addr lists must be written into
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* DMA CSR3 and CSR4, respectively
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*/
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writel(dma_tx, ioaddr + DMA_TX_BASE_ADDR);
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writel(dma_rx, ioaddr + DMA_RCV_BASE_ADDR);
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return 0;
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}
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/* Store and Forward capability is not used at all.
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*
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* The transmit threshold can be programmed by setting the TTC bits in the DMA
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* control register.
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*/
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static void dwmac100_dma_operation_mode(void __iomem *ioaddr, int txmode,
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int rxmode)
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{
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u32 csr6 = readl(ioaddr + DMA_CONTROL);
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if (txmode <= 32)
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csr6 |= DMA_CONTROL_TTC_32;
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else if (txmode <= 64)
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csr6 |= DMA_CONTROL_TTC_64;
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else
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csr6 |= DMA_CONTROL_TTC_128;
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writel(csr6, ioaddr + DMA_CONTROL);
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}
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static void dwmac100_dump_dma_regs(void __iomem *ioaddr)
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{
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int i;
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pr_debug("DWMAC 100 DMA CSR\n");
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for (i = 0; i < 9; i++)
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pr_debug("\t CSR%d (offset 0x%x): 0x%08x\n", i,
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(DMA_BUS_MODE + i * 4),
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readl(ioaddr + DMA_BUS_MODE + i * 4));
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pr_debug("\tCSR20 (0x%x): 0x%08x, CSR21 (0x%x): 0x%08x\n",
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DMA_CUR_TX_BUF_ADDR, readl(ioaddr + DMA_CUR_TX_BUF_ADDR),
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DMA_CUR_RX_BUF_ADDR, readl(ioaddr + DMA_CUR_RX_BUF_ADDR));
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}
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/* DMA controller has two counters to track the number of the missed frames. */
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static void dwmac100_dma_diagnostic_fr(void *data, struct stmmac_extra_stats *x,
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void __iomem *ioaddr)
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{
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struct net_device_stats *stats = (struct net_device_stats *)data;
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u32 csr8 = readl(ioaddr + DMA_MISSED_FRAME_CTR);
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if (unlikely(csr8)) {
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if (csr8 & DMA_MISSED_FRAME_OVE) {
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stats->rx_over_errors += 0x800;
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x->rx_overflow_cntr += 0x800;
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} else {
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unsigned int ove_cntr;
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ove_cntr = ((csr8 & DMA_MISSED_FRAME_OVE_CNTR) >> 17);
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stats->rx_over_errors += ove_cntr;
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x->rx_overflow_cntr += ove_cntr;
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}
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if (csr8 & DMA_MISSED_FRAME_OVE_M) {
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stats->rx_missed_errors += 0xffff;
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x->rx_missed_cntr += 0xffff;
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} else {
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unsigned int miss_f = (csr8 & DMA_MISSED_FRAME_M_CNTR);
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stats->rx_missed_errors += miss_f;
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x->rx_missed_cntr += miss_f;
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}
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}
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}
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const struct stmmac_dma_ops dwmac100_dma_ops = {
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.init = dwmac100_dma_init,
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.dump_regs = dwmac100_dump_dma_regs,
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.dma_mode = dwmac100_dma_operation_mode,
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.dma_diagnostic_fr = dwmac100_dma_diagnostic_fr,
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.enable_dma_transmission = dwmac_enable_dma_transmission,
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.enable_dma_irq = dwmac_enable_dma_irq,
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.disable_dma_irq = dwmac_disable_dma_irq,
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.start_tx = dwmac_dma_start_tx,
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.stop_tx = dwmac_dma_stop_tx,
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.start_rx = dwmac_dma_start_rx,
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.stop_rx = dwmac_dma_stop_rx,
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.dma_interrupt = dwmac_dma_interrupt,
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};
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