Release 4.13 drivers/net/ethernet/samsung/sxgbe/sxgbe_dma.c
/* 10G controller driver for Samsung SoCs
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Siva Reddy Kallam <siva.kallam@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include "sxgbe_common.h"
#include "sxgbe_dma.h"
#include "sxgbe_reg.h"
#include "sxgbe_desc.h"
/* DMA core initialization */
static int sxgbe_dma_init(void __iomem *ioaddr, int fix_burst, int burst_map)
{
u32 reg_val;
reg_val = readl(ioaddr + SXGBE_DMA_SYSBUS_MODE_REG);
/* if fix_burst = 0, Set UNDEF = 1 of DMA_Sys_Mode Register.
* if fix_burst = 1, Set UNDEF = 0 of DMA_Sys_Mode Register.
* burst_map is bitmap for BLEN[4, 8, 16, 32, 64, 128 and 256].
* Set burst_map irrespective of fix_burst value.
*/
if (!fix_burst)
reg_val |= SXGBE_DMA_AXI_UNDEF_BURST;
/* write burst len map */
reg_val |= (burst_map << SXGBE_DMA_BLENMAP_LSHIFT);
writel(reg_val, ioaddr + SXGBE_DMA_SYSBUS_MODE_REG);
return 0;
}
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static void sxgbe_dma_channel_init(void __iomem *ioaddr, int cha_num,
int fix_burst, int pbl, dma_addr_t dma_tx,
dma_addr_t dma_rx, int t_rsize, int r_rsize)
{
u32 reg_val;
dma_addr_t dma_addr;
reg_val = readl(ioaddr + SXGBE_DMA_CHA_CTL_REG(cha_num));
/* set the pbl */
if (fix_burst) {
reg_val |= SXGBE_DMA_PBL_X8MODE;
writel(reg_val, ioaddr + SXGBE_DMA_CHA_CTL_REG(cha_num));
/* program the TX pbl */
reg_val = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cha_num));
reg_val |= (pbl << SXGBE_DMA_TXPBL_LSHIFT);
writel(reg_val, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cha_num));
/* program the RX pbl */
reg_val = readl(ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cha_num));
reg_val |= (pbl << SXGBE_DMA_RXPBL_LSHIFT);
writel(reg_val, ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cha_num));
}
/* program desc registers */
writel(upper_32_bits(dma_tx),
ioaddr + SXGBE_DMA_CHA_TXDESC_HADD_REG(cha_num));
writel(lower_32_bits(dma_tx),
ioaddr + SXGBE_DMA_CHA_TXDESC_LADD_REG(cha_num));
writel(upper_32_bits(dma_rx),
ioaddr + SXGBE_DMA_CHA_RXDESC_HADD_REG(cha_num));
writel(lower_32_bits(dma_rx),
ioaddr + SXGBE_DMA_CHA_RXDESC_LADD_REG(cha_num));
/* program tail pointers */
/* assumption: upper 32 bits are constant and
* same as TX/RX desc list
*/
dma_addr = dma_tx + ((t_rsize - 1) * SXGBE_DESC_SIZE_BYTES);
writel(lower_32_bits(dma_addr),
ioaddr + SXGBE_DMA_CHA_TXDESC_TAILPTR_REG(cha_num));
dma_addr = dma_rx + ((r_rsize - 1) * SXGBE_DESC_SIZE_BYTES);
writel(lower_32_bits(dma_addr),
ioaddr + SXGBE_DMA_CHA_RXDESC_LADD_REG(cha_num));
/* program the ring sizes */
writel(t_rsize - 1, ioaddr + SXGBE_DMA_CHA_TXDESC_RINGLEN_REG(cha_num));
writel(r_rsize - 1, ioaddr + SXGBE_DMA_CHA_RXDESC_RINGLEN_REG(cha_num));
/* Enable TX/RX interrupts */
writel(SXGBE_DMA_ENA_INT,
ioaddr + SXGBE_DMA_CHA_INT_ENABLE_REG(cha_num));
}
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static void sxgbe_enable_dma_transmission(void __iomem *ioaddr, int cha_num)
{
u32 tx_config;
tx_config = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cha_num));
tx_config |= SXGBE_TX_START_DMA;
writel(tx_config, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cha_num));
}
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static void sxgbe_enable_dma_irq(void __iomem *ioaddr, int dma_cnum)
{
/* Enable TX/RX interrupts */
writel(SXGBE_DMA_ENA_INT,
ioaddr + SXGBE_DMA_CHA_INT_ENABLE_REG(dma_cnum));
}
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static void sxgbe_disable_dma_irq(void __iomem *ioaddr, int dma_cnum)
{
/* Disable TX/RX interrupts */
writel(0, ioaddr + SXGBE_DMA_CHA_INT_ENABLE_REG(dma_cnum));
}
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static void sxgbe_dma_start_tx(void __iomem *ioaddr, int tchannels)
{
int cnum;
u32 tx_ctl_reg;
for (cnum = 0; cnum < tchannels; cnum++) {
tx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cnum));
tx_ctl_reg |= SXGBE_TX_ENABLE;
writel(tx_ctl_reg,
ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cnum));
}
}
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static void sxgbe_dma_start_tx_queue(void __iomem *ioaddr, int dma_cnum)
{
u32 tx_ctl_reg;
tx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(dma_cnum));
tx_ctl_reg |= SXGBE_TX_ENABLE;
writel(tx_ctl_reg, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(dma_cnum));
}
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static void sxgbe_dma_stop_tx_queue(void __iomem *ioaddr, int dma_cnum)
{
u32 tx_ctl_reg;
tx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(dma_cnum));
tx_ctl_reg &= ~(SXGBE_TX_ENABLE);
writel(tx_ctl_reg, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(dma_cnum));
}
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static void sxgbe_dma_stop_tx(void __iomem *ioaddr, int tchannels)
{
int cnum;
u32 tx_ctl_reg;
for (cnum = 0; cnum < tchannels; cnum++) {
tx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cnum));
tx_ctl_reg &= ~(SXGBE_TX_ENABLE);
writel(tx_ctl_reg, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(cnum));
}
}
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static void sxgbe_dma_start_rx(void __iomem *ioaddr, int rchannels)
{
int cnum;
u32 rx_ctl_reg;
for (cnum = 0; cnum < rchannels; cnum++) {
rx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cnum));
rx_ctl_reg |= SXGBE_RX_ENABLE;
writel(rx_ctl_reg,
ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cnum));
}
}
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static void sxgbe_dma_stop_rx(void __iomem *ioaddr, int rchannels)
{
int cnum;
u32 rx_ctl_reg;
for (cnum = 0; cnum < rchannels; cnum++) {
rx_ctl_reg = readl(ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cnum));
rx_ctl_reg &= ~(SXGBE_RX_ENABLE);
writel(rx_ctl_reg, ioaddr + SXGBE_DMA_CHA_RXCTL_REG(cnum));
}
}
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static int sxgbe_tx_dma_int_status(void __iomem *ioaddr, int channel_no,
struct sxgbe_extra_stats *x)
{
u32 int_status = readl(ioaddr + SXGBE_DMA_CHA_STATUS_REG(channel_no));
u32 clear_val = 0;
u32 ret_val = 0;
/* TX Normal Interrupt Summary */
if (likely(int_status & SXGBE_DMA_INT_STATUS_NIS)) {
x->normal_irq_n++;
if (int_status & SXGBE_DMA_INT_STATUS_TI) {
ret_val |= handle_tx;
x->tx_normal_irq_n++;
clear_val |= SXGBE_DMA_INT_STATUS_TI;
}
if (int_status & SXGBE_DMA_INT_STATUS_TBU) {
x->tx_underflow_irq++;
ret_val |= tx_bump_tc;
clear_val |= SXGBE_DMA_INT_STATUS_TBU;
}
} else if (unlikely(int_status & SXGBE_DMA_INT_STATUS_AIS)) {
/* TX Abnormal Interrupt Summary */
if (int_status & SXGBE_DMA_INT_STATUS_TPS) {
ret_val |= tx_hard_error;
clear_val |= SXGBE_DMA_INT_STATUS_TPS;
x->tx_process_stopped_irq++;
}
if (int_status & SXGBE_DMA_INT_STATUS_FBE) {
ret_val |= tx_hard_error;
x->fatal_bus_error_irq++;
/* Assumption: FBE bit is the combination of
* all the bus access erros and cleared when
* the respective error bits cleared
*/
/* check for actual cause */
if (int_status & SXGBE_DMA_INT_STATUS_TEB0) {
x->tx_read_transfer_err++;
clear_val |= SXGBE_DMA_INT_STATUS_TEB0;
} else {
x->tx_write_transfer_err++;
}
if (int_status & SXGBE_DMA_INT_STATUS_TEB1) {
x->tx_desc_access_err++;
clear_val |= SXGBE_DMA_INT_STATUS_TEB1;
} else {
x->tx_buffer_access_err++;
}
if (int_status & SXGBE_DMA_INT_STATUS_TEB2) {
x->tx_data_transfer_err++;
clear_val |= SXGBE_DMA_INT_STATUS_TEB2;
}
}
/* context descriptor error */
if (int_status & SXGBE_DMA_INT_STATUS_CTXTERR) {
x->tx_ctxt_desc_err++;
clear_val |= SXGBE_DMA_INT_STATUS_CTXTERR;
}
}
/* clear the served bits */
writel(clear_val, ioaddr + SXGBE_DMA_CHA_STATUS_REG(channel_no));
return ret_val;
}
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static int sxgbe_rx_dma_int_status(void __iomem *ioaddr, int channel_no,
struct sxgbe_extra_stats *x)
{
u32 int_status = readl(ioaddr + SXGBE_DMA_CHA_STATUS_REG(channel_no));
u32 clear_val = 0;
u32 ret_val = 0;
/* RX Normal Interrupt Summary */
if (likely(int_status & SXGBE_DMA_INT_STATUS_NIS)) {
x->normal_irq_n++;
if (int_status & SXGBE_DMA_INT_STATUS_RI) {
ret_val |= handle_rx;
x->rx_normal_irq_n++;
clear_val |= SXGBE_DMA_INT_STATUS_RI;
}
} else if (unlikely(int_status & SXGBE_DMA_INT_STATUS_AIS)) {
/* RX Abnormal Interrupt Summary */
if (int_status & SXGBE_DMA_INT_STATUS_RBU) {
ret_val |= rx_bump_tc;
clear_val |= SXGBE_DMA_INT_STATUS_RBU;
x->rx_underflow_irq++;
}
if (int_status & SXGBE_DMA_INT_STATUS_RPS) {
ret_val |= rx_hard_error;
clear_val |= SXGBE_DMA_INT_STATUS_RPS;
x->rx_process_stopped_irq++;
}
if (int_status & SXGBE_DMA_INT_STATUS_FBE) {
ret_val |= rx_hard_error;
x->fatal_bus_error_irq++;
/* Assumption: FBE bit is the combination of
* all the bus access erros and cleared when
* the respective error bits cleared
*/
/* check for actual cause */
if (int_status & SXGBE_DMA_INT_STATUS_REB0) {
x->rx_read_transfer_err++;
clear_val |= SXGBE_DMA_INT_STATUS_REB0;
} else {
x->rx_write_transfer_err++;
}
if (int_status & SXGBE_DMA_INT_STATUS_REB1) {
x->rx_desc_access_err++;
clear_val |= SXGBE_DMA_INT_STATUS_REB1;
} else {
x->rx_buffer_access_err++;
}
if (int_status & SXGBE_DMA_INT_STATUS_REB2) {
x->rx_data_transfer_err++;
clear_val |= SXGBE_DMA_INT_STATUS_REB2;
}
}
}
/* clear the served bits */
writel(clear_val, ioaddr + SXGBE_DMA_CHA_STATUS_REG(channel_no));
return ret_val;
}
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/* Program the HW RX Watchdog */
static void sxgbe_dma_rx_watchdog(void __iomem *ioaddr, u32 riwt)
{
u32 que_num;
SXGBE_FOR_EACH_QUEUE(SXGBE_RX_QUEUES, que_num) {
writel(riwt,
ioaddr + SXGBE_DMA_CHA_INT_RXWATCHTMR_REG(que_num));
}
}
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static void sxgbe_enable_tso(void __iomem *ioaddr, u8 chan_num)
{
u32 ctrl;
ctrl = readl(ioaddr + SXGBE_DMA_CHA_TXCTL_REG(chan_num));
ctrl |= SXGBE_DMA_CHA_TXCTL_TSE_ENABLE;
writel(ctrl, ioaddr + SXGBE_DMA_CHA_TXCTL_REG(chan_num));
}
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static const struct sxgbe_dma_ops sxgbe_dma_ops = {
.init = sxgbe_dma_init,
.cha_init = sxgbe_dma_channel_init,
.enable_dma_transmission = sxgbe_enable_dma_transmission,
.enable_dma_irq = sxgbe_enable_dma_irq,
.disable_dma_irq = sxgbe_disable_dma_irq,
.start_tx = sxgbe_dma_start_tx,
.start_tx_queue = sxgbe_dma_start_tx_queue,
.stop_tx = sxgbe_dma_stop_tx,
.stop_tx_queue = sxgbe_dma_stop_tx_queue,
.start_rx = sxgbe_dma_start_rx,
.stop_rx = sxgbe_dma_stop_rx,
.tx_dma_int_status = sxgbe_tx_dma_int_status,
.rx_dma_int_status = sxgbe_rx_dma_int_status,
.rx_watchdog = sxgbe_dma_rx_watchdog,
.enable_tso = sxgbe_enable_tso,
};
const struct sxgbe_dma_ops *sxgbe_get_dma_ops(void)
{
return &sxgbe_dma_ops;
}
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