369 lines
10 KiB
C
369 lines
10 KiB
C
/* 10G controller driver for Samsung SoCs
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*
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* Copyright (C) 2013 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Author: Siva Reddy Kallam <siva.kallam@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/io.h>
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#include <linux/netdevice.h>
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#include <linux/phy.h>
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#include "sxgbe_common.h"
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#include "sxgbe_dma.h"
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#include "sxgbe_reg.h"
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#include "sxgbe_desc.h"
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/* DMA core initialization */
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static int sxgbe_dma_init(void __iomem *ioaddr, int fix_burst, int burst_map)
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{
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u32 reg_val;
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reg_val = readl(ioaddr + SXGBE_DMA_SYSBUS_MODE_REG);
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/* if fix_burst = 0, Set UNDEF = 1 of DMA_Sys_Mode Register.
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* if fix_burst = 1, Set UNDEF = 0 of DMA_Sys_Mode Register.
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* burst_map is bitmap for BLEN[4, 8, 16, 32, 64, 128 and 256].
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* Set burst_map irrespective of fix_burst value.
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*/
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if (!fix_burst)
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reg_val |= SXGBE_DMA_AXI_UNDEF_BURST;
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/* write burst len map */
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reg_val |= (burst_map << SXGBE_DMA_BLENMAP_LSHIFT);
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writel(reg_val, ioaddr + SXGBE_DMA_SYSBUS_MODE_REG);
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return 0;
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}
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static void sxgbe_dma_channel_init(void __iomem *ioaddr, int cha_num,
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int fix_burst, int pbl, dma_addr_t dma_tx,
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dma_addr_t dma_rx, int t_rsize, int r_rsize)
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{
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u32 reg_val;
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dma_addr_t dma_addr;
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reg_val = readl(ioaddr + SXGBE_DMA_CHA_CTL_REG(cha_num));
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/* set the pbl */
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if (fix_burst) {
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reg_val |= SXGBE_DMA_PBL_X8MODE;
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writel(reg_val, ioaddr + SXGBE_DMA_CHA_CTL_REG(cha_num));
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/* program the TX pbl */
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reg_val = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cha_num));
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reg_val |= (pbl << SXGBE_DMA_TXPBL_LSHIFT);
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writel(reg_val, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cha_num));
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/* program the RX pbl */
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reg_val = readl(ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cha_num));
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reg_val |= (pbl << SXGBE_DMA_RXPBL_LSHIFT);
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writel(reg_val, ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cha_num));
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}
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/* program desc registers */
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writel(upper_32_bits(dma_tx),
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ioaddr + SXGBE_DMA_CHA_TXDESC_HADD_REG(cha_num));
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writel(lower_32_bits(dma_tx),
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ioaddr + SXGBE_DMA_CHA_TXDESC_LADD_REG(cha_num));
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writel(upper_32_bits(dma_rx),
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ioaddr + SXGBE_DMA_CHA_RXDESC_HADD_REG(cha_num));
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writel(lower_32_bits(dma_rx),
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ioaddr + SXGBE_DMA_CHA_RXDESC_LADD_REG(cha_num));
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/* program tail pointers */
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/* assumption: upper 32 bits are constant and
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* same as TX/RX desc list
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*/
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dma_addr = dma_tx + ((t_rsize - 1) * SXGBE_DESC_SIZE_BYTES);
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writel(lower_32_bits(dma_addr),
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ioaddr + SXGBE_DMA_CHA_TXDESC_TAILPTR_REG(cha_num));
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dma_addr = dma_rx + ((r_rsize - 1) * SXGBE_DESC_SIZE_BYTES);
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writel(lower_32_bits(dma_addr),
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ioaddr + SXGBE_DMA_CHA_RXDESC_LADD_REG(cha_num));
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/* program the ring sizes */
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writel(t_rsize - 1, ioaddr + SXGBE_DMA_CHA_TXDESC_RINGLEN_REG(cha_num));
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writel(r_rsize - 1, ioaddr + SXGBE_DMA_CHA_RXDESC_RINGLEN_REG(cha_num));
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/* Enable TX/RX interrupts */
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writel(SXGBE_DMA_ENA_INT,
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ioaddr + SXGBE_DMA_CHA_INT_ENABLE_REG(cha_num));
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}
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static void sxgbe_enable_dma_transmission(void __iomem *ioaddr, int cha_num)
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{
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u32 tx_config;
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tx_config = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cha_num));
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tx_config |= SXGBE_TX_START_DMA;
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writel(tx_config, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cha_num));
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}
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static void sxgbe_enable_dma_irq(void __iomem *ioaddr, int dma_cnum)
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{
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/* Enable TX/RX interrupts */
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writel(SXGBE_DMA_ENA_INT,
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ioaddr + SXGBE_DMA_CHA_INT_ENABLE_REG(dma_cnum));
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}
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static void sxgbe_disable_dma_irq(void __iomem *ioaddr, int dma_cnum)
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{
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/* Disable TX/RX interrupts */
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writel(0, ioaddr + SXGBE_DMA_CHA_INT_ENABLE_REG(dma_cnum));
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}
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static void sxgbe_dma_start_tx(void __iomem *ioaddr, int tchannels)
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{
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int cnum;
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u32 tx_ctl_reg;
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for (cnum = 0; cnum < tchannels; cnum++) {
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tx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cnum));
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tx_ctl_reg |= SXGBE_TX_ENABLE;
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writel(tx_ctl_reg,
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ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cnum));
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}
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}
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static void sxgbe_dma_start_tx_queue(void __iomem *ioaddr, int dma_cnum)
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{
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u32 tx_ctl_reg;
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tx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(dma_cnum));
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tx_ctl_reg |= SXGBE_TX_ENABLE;
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writel(tx_ctl_reg, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(dma_cnum));
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}
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static void sxgbe_dma_stop_tx_queue(void __iomem *ioaddr, int dma_cnum)
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{
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u32 tx_ctl_reg;
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tx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(dma_cnum));
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tx_ctl_reg &= ~(SXGBE_TX_ENABLE);
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writel(tx_ctl_reg, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(dma_cnum));
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}
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static void sxgbe_dma_stop_tx(void __iomem *ioaddr, int tchannels)
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{
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int cnum;
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u32 tx_ctl_reg;
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for (cnum = 0; cnum < tchannels; cnum++) {
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tx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cnum));
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tx_ctl_reg &= ~(SXGBE_TX_ENABLE);
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writel(tx_ctl_reg, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cnum));
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}
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}
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static void sxgbe_dma_start_rx(void __iomem *ioaddr, int rchannels)
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{
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int cnum;
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u32 rx_ctl_reg;
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for (cnum = 0; cnum < rchannels; cnum++) {
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rx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cnum));
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rx_ctl_reg |= SXGBE_RX_ENABLE;
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writel(rx_ctl_reg,
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ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cnum));
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}
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}
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static void sxgbe_dma_stop_rx(void __iomem *ioaddr, int rchannels)
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{
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int cnum;
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u32 rx_ctl_reg;
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for (cnum = 0; cnum < rchannels; cnum++) {
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rx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cnum));
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rx_ctl_reg &= ~(SXGBE_RX_ENABLE);
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writel(rx_ctl_reg, ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cnum));
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}
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}
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static int sxgbe_tx_dma_int_status(void __iomem *ioaddr, int channel_no,
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struct sxgbe_extra_stats *x)
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{
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u32 int_status = readl(ioaddr + SXGBE_DMA_CHA_STATUS_REG(channel_no));
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u32 clear_val = 0;
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u32 ret_val = 0;
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/* TX Normal Interrupt Summary */
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if (likely(int_status & SXGBE_DMA_INT_STATUS_NIS)) {
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x->normal_irq_n++;
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if (int_status & SXGBE_DMA_INT_STATUS_TI) {
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ret_val |= handle_tx;
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x->tx_normal_irq_n++;
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clear_val |= SXGBE_DMA_INT_STATUS_TI;
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}
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if (int_status & SXGBE_DMA_INT_STATUS_TBU) {
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x->tx_underflow_irq++;
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ret_val |= tx_bump_tc;
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clear_val |= SXGBE_DMA_INT_STATUS_TBU;
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}
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} else if (unlikely(int_status & SXGBE_DMA_INT_STATUS_AIS)) {
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/* TX Abnormal Interrupt Summary */
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if (int_status & SXGBE_DMA_INT_STATUS_TPS) {
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ret_val |= tx_hard_error;
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clear_val |= SXGBE_DMA_INT_STATUS_TPS;
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x->tx_process_stopped_irq++;
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}
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if (int_status & SXGBE_DMA_INT_STATUS_FBE) {
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ret_val |= tx_hard_error;
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x->fatal_bus_error_irq++;
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/* Assumption: FBE bit is the combination of
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* all the bus access erros and cleared when
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* the respective error bits cleared
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*/
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/* check for actual cause */
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if (int_status & SXGBE_DMA_INT_STATUS_TEB0) {
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x->tx_read_transfer_err++;
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clear_val |= SXGBE_DMA_INT_STATUS_TEB0;
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} else {
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x->tx_write_transfer_err++;
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}
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if (int_status & SXGBE_DMA_INT_STATUS_TEB1) {
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x->tx_desc_access_err++;
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clear_val |= SXGBE_DMA_INT_STATUS_TEB1;
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} else {
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x->tx_buffer_access_err++;
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}
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if (int_status & SXGBE_DMA_INT_STATUS_TEB2) {
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x->tx_data_transfer_err++;
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clear_val |= SXGBE_DMA_INT_STATUS_TEB2;
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}
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}
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/* context descriptor error */
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if (int_status & SXGBE_DMA_INT_STATUS_CTXTERR) {
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x->tx_ctxt_desc_err++;
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clear_val |= SXGBE_DMA_INT_STATUS_CTXTERR;
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}
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}
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/* clear the served bits */
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writel(clear_val, ioaddr + SXGBE_DMA_CHA_STATUS_REG(channel_no));
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return ret_val;
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}
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static int sxgbe_rx_dma_int_status(void __iomem *ioaddr, int channel_no,
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struct sxgbe_extra_stats *x)
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{
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u32 int_status = readl(ioaddr + SXGBE_DMA_CHA_STATUS_REG(channel_no));
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u32 clear_val = 0;
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u32 ret_val = 0;
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/* RX Normal Interrupt Summary */
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if (likely(int_status & SXGBE_DMA_INT_STATUS_NIS)) {
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x->normal_irq_n++;
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if (int_status & SXGBE_DMA_INT_STATUS_RI) {
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ret_val |= handle_rx;
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x->rx_normal_irq_n++;
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clear_val |= SXGBE_DMA_INT_STATUS_RI;
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}
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} else if (unlikely(int_status & SXGBE_DMA_INT_STATUS_AIS)) {
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/* RX Abnormal Interrupt Summary */
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if (int_status & SXGBE_DMA_INT_STATUS_RBU) {
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ret_val |= rx_bump_tc;
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clear_val |= SXGBE_DMA_INT_STATUS_RBU;
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x->rx_underflow_irq++;
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}
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if (int_status & SXGBE_DMA_INT_STATUS_RPS) {
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ret_val |= rx_hard_error;
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clear_val |= SXGBE_DMA_INT_STATUS_RPS;
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x->rx_process_stopped_irq++;
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}
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if (int_status & SXGBE_DMA_INT_STATUS_FBE) {
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ret_val |= rx_hard_error;
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x->fatal_bus_error_irq++;
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/* Assumption: FBE bit is the combination of
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* all the bus access erros and cleared when
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* the respective error bits cleared
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*/
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/* check for actual cause */
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if (int_status & SXGBE_DMA_INT_STATUS_REB0) {
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x->rx_read_transfer_err++;
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clear_val |= SXGBE_DMA_INT_STATUS_REB0;
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} else {
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x->rx_write_transfer_err++;
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}
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if (int_status & SXGBE_DMA_INT_STATUS_REB1) {
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x->rx_desc_access_err++;
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clear_val |= SXGBE_DMA_INT_STATUS_REB1;
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} else {
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x->rx_buffer_access_err++;
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}
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if (int_status & SXGBE_DMA_INT_STATUS_REB2) {
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x->rx_data_transfer_err++;
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clear_val |= SXGBE_DMA_INT_STATUS_REB2;
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}
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}
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}
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/* clear the served bits */
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writel(clear_val, ioaddr + SXGBE_DMA_CHA_STATUS_REG(channel_no));
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return ret_val;
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}
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/* Program the HW RX Watchdog */
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static void sxgbe_dma_rx_watchdog(void __iomem *ioaddr, u32 riwt)
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{
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u32 que_num;
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SXGBE_FOR_EACH_QUEUE(SXGBE_RX_QUEUES, que_num) {
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writel(riwt,
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ioaddr + SXGBE_DMA_CHA_INT_RXWATCHTMR_REG(que_num));
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}
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}
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static void sxgbe_enable_tso(void __iomem *ioaddr, u8 chan_num)
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{
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u32 ctrl;
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ctrl = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(chan_num));
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ctrl |= SXGBE_DMA_CHA_TXCTL_TSE_ENABLE;
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writel(ctrl, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(chan_num));
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}
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static const struct sxgbe_dma_ops sxgbe_dma_ops = {
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.init = sxgbe_dma_init,
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.cha_init = sxgbe_dma_channel_init,
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.enable_dma_transmission = sxgbe_enable_dma_transmission,
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.enable_dma_irq = sxgbe_enable_dma_irq,
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.disable_dma_irq = sxgbe_disable_dma_irq,
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.start_tx = sxgbe_dma_start_tx,
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.start_tx_queue = sxgbe_dma_start_tx_queue,
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.stop_tx = sxgbe_dma_stop_tx,
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.stop_tx_queue = sxgbe_dma_stop_tx_queue,
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.start_rx = sxgbe_dma_start_rx,
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.stop_rx = sxgbe_dma_stop_rx,
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.tx_dma_int_status = sxgbe_tx_dma_int_status,
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.rx_dma_int_status = sxgbe_rx_dma_int_status,
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.rx_watchdog = sxgbe_dma_rx_watchdog,
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.enable_tso = sxgbe_enable_tso,
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};
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const struct sxgbe_dma_ops *sxgbe_get_dma_ops(void)
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{
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return &sxgbe_dma_ops;
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}
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