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path: root/drivers/net/ethernet/qualcomm/emac/emac-mac.c
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Diffstat (limited to 'drivers/net/ethernet/qualcomm/emac/emac-mac.c')
-rw-r--r--drivers/net/ethernet/qualcomm/emac/emac-mac.c1528
1 files changed, 1528 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qualcomm/emac/emac-mac.c b/drivers/net/ethernet/qualcomm/emac/emac-mac.c
new file mode 100644
index 000000000000..e97968ed4b8f
--- /dev/null
+++ b/drivers/net/ethernet/qualcomm/emac/emac-mac.c
@@ -0,0 +1,1528 @@
+/* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/* Qualcomm Technologies, Inc. EMAC Ethernet Controller MAC layer support
+ */
+
+#include <linux/tcp.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/crc32.h>
+#include <linux/if_vlan.h>
+#include <linux/jiffies.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+#include <net/ip6_checksum.h>
+#include "emac.h"
+#include "emac-sgmii.h"
+
+/* EMAC base register offsets */
+#define EMAC_MAC_CTRL 0x001480
+#define EMAC_WOL_CTRL0 0x0014a0
+#define EMAC_RSS_KEY0 0x0014b0
+#define EMAC_H1TPD_BASE_ADDR_LO 0x0014e0
+#define EMAC_H2TPD_BASE_ADDR_LO 0x0014e4
+#define EMAC_H3TPD_BASE_ADDR_LO 0x0014e8
+#define EMAC_INTER_SRAM_PART9 0x001534
+#define EMAC_DESC_CTRL_0 0x001540
+#define EMAC_DESC_CTRL_1 0x001544
+#define EMAC_DESC_CTRL_2 0x001550
+#define EMAC_DESC_CTRL_10 0x001554
+#define EMAC_DESC_CTRL_12 0x001558
+#define EMAC_DESC_CTRL_13 0x00155c
+#define EMAC_DESC_CTRL_3 0x001560
+#define EMAC_DESC_CTRL_4 0x001564
+#define EMAC_DESC_CTRL_5 0x001568
+#define EMAC_DESC_CTRL_14 0x00156c
+#define EMAC_DESC_CTRL_15 0x001570
+#define EMAC_DESC_CTRL_16 0x001574
+#define EMAC_DESC_CTRL_6 0x001578
+#define EMAC_DESC_CTRL_8 0x001580
+#define EMAC_DESC_CTRL_9 0x001584
+#define EMAC_DESC_CTRL_11 0x001588
+#define EMAC_TXQ_CTRL_0 0x001590
+#define EMAC_TXQ_CTRL_1 0x001594
+#define EMAC_TXQ_CTRL_2 0x001598
+#define EMAC_RXQ_CTRL_0 0x0015a0
+#define EMAC_RXQ_CTRL_1 0x0015a4
+#define EMAC_RXQ_CTRL_2 0x0015a8
+#define EMAC_RXQ_CTRL_3 0x0015ac
+#define EMAC_BASE_CPU_NUMBER 0x0015b8
+#define EMAC_DMA_CTRL 0x0015c0
+#define EMAC_MAILBOX_0 0x0015e0
+#define EMAC_MAILBOX_5 0x0015e4
+#define EMAC_MAILBOX_6 0x0015e8
+#define EMAC_MAILBOX_13 0x0015ec
+#define EMAC_MAILBOX_2 0x0015f4
+#define EMAC_MAILBOX_3 0x0015f8
+#define EMAC_MAILBOX_11 0x00160c
+#define EMAC_AXI_MAST_CTRL 0x001610
+#define EMAC_MAILBOX_12 0x001614
+#define EMAC_MAILBOX_9 0x001618
+#define EMAC_MAILBOX_10 0x00161c
+#define EMAC_ATHR_HEADER_CTRL 0x001620
+#define EMAC_CLK_GATE_CTRL 0x001814
+#define EMAC_MISC_CTRL 0x001990
+#define EMAC_MAILBOX_7 0x0019e0
+#define EMAC_MAILBOX_8 0x0019e4
+#define EMAC_MAILBOX_15 0x001bd4
+#define EMAC_MAILBOX_16 0x001bd8
+
+/* EMAC_MAC_CTRL */
+#define SINGLE_PAUSE_MODE 0x10000000
+#define DEBUG_MODE 0x08000000
+#define BROAD_EN 0x04000000
+#define MULTI_ALL 0x02000000
+#define RX_CHKSUM_EN 0x01000000
+#define HUGE 0x00800000
+#define SPEED(x) (((x) & 0x3) << 20)
+#define SPEED_MASK SPEED(0x3)
+#define SIMR 0x00080000
+#define TPAUSE 0x00010000
+#define PROM_MODE 0x00008000
+#define VLAN_STRIP 0x00004000
+#define PRLEN_BMSK 0x00003c00
+#define PRLEN_SHFT 10
+#define HUGEN 0x00000200
+#define FLCHK 0x00000100
+#define PCRCE 0x00000080
+#define CRCE 0x00000040
+#define FULLD 0x00000020
+#define MAC_LP_EN 0x00000010
+#define RXFC 0x00000008
+#define TXFC 0x00000004
+#define RXEN 0x00000002
+#define TXEN 0x00000001
+
+
+/* EMAC_WOL_CTRL0 */
+#define LK_CHG_PME 0x20
+#define LK_CHG_EN 0x10
+#define MG_FRAME_PME 0x8
+#define MG_FRAME_EN 0x4
+#define WK_FRAME_EN 0x1
+
+/* EMAC_DESC_CTRL_3 */
+#define RFD_RING_SIZE_BMSK 0xfff
+
+/* EMAC_DESC_CTRL_4 */
+#define RX_BUFFER_SIZE_BMSK 0xffff
+
+/* EMAC_DESC_CTRL_6 */
+#define RRD_RING_SIZE_BMSK 0xfff
+
+/* EMAC_DESC_CTRL_9 */
+#define TPD_RING_SIZE_BMSK 0xffff
+
+/* EMAC_TXQ_CTRL_0 */
+#define NUM_TXF_BURST_PREF_BMSK 0xffff0000
+#define NUM_TXF_BURST_PREF_SHFT 16
+#define LS_8023_SP 0x80
+#define TXQ_MODE 0x40
+#define TXQ_EN 0x20
+#define IP_OP_SP 0x10
+#define NUM_TPD_BURST_PREF_BMSK 0xf
+#define NUM_TPD_BURST_PREF_SHFT 0
+
+/* EMAC_TXQ_CTRL_1 */
+#define JUMBO_TASK_OFFLOAD_THRESHOLD_BMSK 0x7ff
+
+/* EMAC_TXQ_CTRL_2 */
+#define TXF_HWM_BMSK 0xfff0000
+#define TXF_LWM_BMSK 0xfff
+
+/* EMAC_RXQ_CTRL_0 */
+#define RXQ_EN BIT(31)
+#define CUT_THRU_EN BIT(30)
+#define RSS_HASH_EN BIT(29)
+#define NUM_RFD_BURST_PREF_BMSK 0x3f00000
+#define NUM_RFD_BURST_PREF_SHFT 20
+#define IDT_TABLE_SIZE_BMSK 0x1ff00
+#define IDT_TABLE_SIZE_SHFT 8
+#define SP_IPV6 0x80
+
+/* EMAC_RXQ_CTRL_1 */
+#define JUMBO_1KAH_BMSK 0xf000
+#define JUMBO_1KAH_SHFT 12
+#define RFD_PREF_LOW_TH 0x10
+#define RFD_PREF_LOW_THRESHOLD_BMSK 0xfc0
+#define RFD_PREF_LOW_THRESHOLD_SHFT 6
+#define RFD_PREF_UP_TH 0x10
+#define RFD_PREF_UP_THRESHOLD_BMSK 0x3f
+#define RFD_PREF_UP_THRESHOLD_SHFT 0
+
+/* EMAC_RXQ_CTRL_2 */
+#define RXF_DOF_THRESFHOLD 0x1a0
+#define RXF_DOF_THRESHOLD_BMSK 0xfff0000
+#define RXF_DOF_THRESHOLD_SHFT 16
+#define RXF_UOF_THRESFHOLD 0xbe
+#define RXF_UOF_THRESHOLD_BMSK 0xfff
+#define RXF_UOF_THRESHOLD_SHFT 0
+
+/* EMAC_RXQ_CTRL_3 */
+#define RXD_TIMER_BMSK 0xffff0000
+#define RXD_THRESHOLD_BMSK 0xfff
+#define RXD_THRESHOLD_SHFT 0
+
+/* EMAC_DMA_CTRL */
+#define DMAW_DLY_CNT_BMSK 0xf0000
+#define DMAW_DLY_CNT_SHFT 16
+#define DMAR_DLY_CNT_BMSK 0xf800
+#define DMAR_DLY_CNT_SHFT 11
+#define DMAR_REQ_PRI 0x400
+#define REGWRBLEN_BMSK 0x380
+#define REGWRBLEN_SHFT 7
+#define REGRDBLEN_BMSK 0x70
+#define REGRDBLEN_SHFT 4
+#define OUT_ORDER_MODE 0x4
+#define ENH_ORDER_MODE 0x2
+#define IN_ORDER_MODE 0x1
+
+/* EMAC_MAILBOX_13 */
+#define RFD3_PROC_IDX_BMSK 0xfff0000
+#define RFD3_PROC_IDX_SHFT 16
+#define RFD3_PROD_IDX_BMSK 0xfff
+#define RFD3_PROD_IDX_SHFT 0
+
+/* EMAC_MAILBOX_2 */
+#define NTPD_CONS_IDX_BMSK 0xffff0000
+#define NTPD_CONS_IDX_SHFT 16
+
+/* EMAC_MAILBOX_3 */
+#define RFD0_CONS_IDX_BMSK 0xfff
+#define RFD0_CONS_IDX_SHFT 0
+
+/* EMAC_MAILBOX_11 */
+#define H3TPD_PROD_IDX_BMSK 0xffff0000
+#define H3TPD_PROD_IDX_SHFT 16
+
+/* EMAC_AXI_MAST_CTRL */
+#define DATA_BYTE_SWAP 0x8
+#define MAX_BOUND 0x2
+#define MAX_BTYPE 0x1
+
+/* EMAC_MAILBOX_12 */
+#define H3TPD_CONS_IDX_BMSK 0xffff0000
+#define H3TPD_CONS_IDX_SHFT 16
+
+/* EMAC_MAILBOX_9 */
+#define H2TPD_PROD_IDX_BMSK 0xffff
+#define H2TPD_PROD_IDX_SHFT 0
+
+/* EMAC_MAILBOX_10 */
+#define H1TPD_CONS_IDX_BMSK 0xffff0000
+#define H1TPD_CONS_IDX_SHFT 16
+#define H2TPD_CONS_IDX_BMSK 0xffff
+#define H2TPD_CONS_IDX_SHFT 0
+
+/* EMAC_ATHR_HEADER_CTRL */
+#define HEADER_CNT_EN 0x2
+#define HEADER_ENABLE 0x1
+
+/* EMAC_MAILBOX_0 */
+#define RFD0_PROC_IDX_BMSK 0xfff0000
+#define RFD0_PROC_IDX_SHFT 16
+#define RFD0_PROD_IDX_BMSK 0xfff
+#define RFD0_PROD_IDX_SHFT 0
+
+/* EMAC_MAILBOX_5 */
+#define RFD1_PROC_IDX_BMSK 0xfff0000
+#define RFD1_PROC_IDX_SHFT 16
+#define RFD1_PROD_IDX_BMSK 0xfff
+#define RFD1_PROD_IDX_SHFT 0
+
+/* EMAC_MISC_CTRL */
+#define RX_UNCPL_INT_EN 0x1
+
+/* EMAC_MAILBOX_7 */
+#define RFD2_CONS_IDX_BMSK 0xfff0000
+#define RFD2_CONS_IDX_SHFT 16
+#define RFD1_CONS_IDX_BMSK 0xfff
+#define RFD1_CONS_IDX_SHFT 0
+
+/* EMAC_MAILBOX_8 */
+#define RFD3_CONS_IDX_BMSK 0xfff
+#define RFD3_CONS_IDX_SHFT 0
+
+/* EMAC_MAILBOX_15 */
+#define NTPD_PROD_IDX_BMSK 0xffff
+#define NTPD_PROD_IDX_SHFT 0
+
+/* EMAC_MAILBOX_16 */
+#define H1TPD_PROD_IDX_BMSK 0xffff
+#define H1TPD_PROD_IDX_SHFT 0
+
+#define RXQ0_RSS_HSTYP_IPV6_TCP_EN 0x20
+#define RXQ0_RSS_HSTYP_IPV6_EN 0x10
+#define RXQ0_RSS_HSTYP_IPV4_TCP_EN 0x8
+#define RXQ0_RSS_HSTYP_IPV4_EN 0x4
+
+/* EMAC_EMAC_WRAPPER_TX_TS_INX */
+#define EMAC_WRAPPER_TX_TS_EMPTY BIT(31)
+#define EMAC_WRAPPER_TX_TS_INX_BMSK 0xffff
+
+struct emac_skb_cb {
+ u32 tpd_idx;
+ unsigned long jiffies;
+};
+
+#define EMAC_SKB_CB(skb) ((struct emac_skb_cb *)(skb)->cb)
+#define EMAC_RSS_IDT_SIZE 256
+#define JUMBO_1KAH 0x4
+#define RXD_TH 0x100
+#define EMAC_TPD_LAST_FRAGMENT 0x80000000
+#define EMAC_TPD_TSTAMP_SAVE 0x80000000
+
+/* EMAC Errors in emac_rrd.word[3] */
+#define EMAC_RRD_L4F BIT(14)
+#define EMAC_RRD_IPF BIT(15)
+#define EMAC_RRD_CRC BIT(21)
+#define EMAC_RRD_FAE BIT(22)
+#define EMAC_RRD_TRN BIT(23)
+#define EMAC_RRD_RNT BIT(24)
+#define EMAC_RRD_INC BIT(25)
+#define EMAC_RRD_FOV BIT(29)
+#define EMAC_RRD_LEN BIT(30)
+
+/* Error bits that will result in a received frame being discarded */
+#define EMAC_RRD_ERROR (EMAC_RRD_IPF | EMAC_RRD_CRC | EMAC_RRD_FAE | \
+ EMAC_RRD_TRN | EMAC_RRD_RNT | EMAC_RRD_INC | \
+ EMAC_RRD_FOV | EMAC_RRD_LEN)
+#define EMAC_RRD_STATS_DW_IDX 3
+
+#define EMAC_RRD(RXQ, SIZE, IDX) ((RXQ)->rrd.v_addr + (SIZE * (IDX)))
+#define EMAC_RFD(RXQ, SIZE, IDX) ((RXQ)->rfd.v_addr + (SIZE * (IDX)))
+#define EMAC_TPD(TXQ, SIZE, IDX) ((TXQ)->tpd.v_addr + (SIZE * (IDX)))
+
+#define GET_RFD_BUFFER(RXQ, IDX) (&((RXQ)->rfd.rfbuff[(IDX)]))
+#define GET_TPD_BUFFER(RTQ, IDX) (&((RTQ)->tpd.tpbuff[(IDX)]))
+
+#define EMAC_TX_POLL_HWTXTSTAMP_THRESHOLD 8
+
+#define ISR_RX_PKT (\
+ RX_PKT_INT0 |\
+ RX_PKT_INT1 |\
+ RX_PKT_INT2 |\
+ RX_PKT_INT3)
+
+#define EMAC_MAC_IRQ_RES "core0"
+
+void emac_mac_multicast_addr_set(struct emac_adapter *adpt, u8 *addr)
+{
+ u32 crc32, bit, reg, mta;
+
+ /* Calculate the CRC of the MAC address */
+ crc32 = ether_crc(ETH_ALEN, addr);
+
+ /* The HASH Table is an array of 2 32-bit registers. It is
+ * treated like an array of 64 bits (BitArray[hash_value]).
+ * Use the upper 6 bits of the above CRC as the hash value.
+ */
+ reg = (crc32 >> 31) & 0x1;
+ bit = (crc32 >> 26) & 0x1F;
+
+ mta = readl(adpt->base + EMAC_HASH_TAB_REG0 + (reg << 2));
+ mta |= BIT(bit);
+ writel(mta, adpt->base + EMAC_HASH_TAB_REG0 + (reg << 2));
+}
+
+void emac_mac_multicast_addr_clear(struct emac_adapter *adpt)
+{
+ writel(0, adpt->base + EMAC_HASH_TAB_REG0);
+ writel(0, adpt->base + EMAC_HASH_TAB_REG1);
+}
+
+/* definitions for RSS */
+#define EMAC_RSS_KEY(_i, _type) \
+ (EMAC_RSS_KEY0 + ((_i) * sizeof(_type)))
+#define EMAC_RSS_TBL(_i, _type) \
+ (EMAC_IDT_TABLE0 + ((_i) * sizeof(_type)))
+
+/* Config MAC modes */
+void emac_mac_mode_config(struct emac_adapter *adpt)
+{
+ struct net_device *netdev = adpt->netdev;
+ u32 mac;
+
+ mac = readl(adpt->base + EMAC_MAC_CTRL);
+ mac &= ~(VLAN_STRIP | PROM_MODE | MULTI_ALL | MAC_LP_EN);
+
+ if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
+ mac |= VLAN_STRIP;
+
+ if (netdev->flags & IFF_PROMISC)
+ mac |= PROM_MODE;
+
+ if (netdev->flags & IFF_ALLMULTI)
+ mac |= MULTI_ALL;
+
+ writel(mac, adpt->base + EMAC_MAC_CTRL);
+}
+
+/* Config descriptor rings */
+static void emac_mac_dma_rings_config(struct emac_adapter *adpt)
+{
+ static const unsigned short tpd_q_offset[] = {
+ EMAC_DESC_CTRL_8, EMAC_H1TPD_BASE_ADDR_LO,
+ EMAC_H2TPD_BASE_ADDR_LO, EMAC_H3TPD_BASE_ADDR_LO};
+ static const unsigned short rfd_q_offset[] = {
+ EMAC_DESC_CTRL_2, EMAC_DESC_CTRL_10,
+ EMAC_DESC_CTRL_12, EMAC_DESC_CTRL_13};
+ static const unsigned short rrd_q_offset[] = {
+ EMAC_DESC_CTRL_5, EMAC_DESC_CTRL_14,
+ EMAC_DESC_CTRL_15, EMAC_DESC_CTRL_16};
+
+ /* TPD (Transmit Packet Descriptor) */
+ writel(upper_32_bits(adpt->tx_q.tpd.dma_addr),
+ adpt->base + EMAC_DESC_CTRL_1);
+
+ writel(lower_32_bits(adpt->tx_q.tpd.dma_addr),
+ adpt->base + tpd_q_offset[0]);
+
+ writel(adpt->tx_q.tpd.count & TPD_RING_SIZE_BMSK,
+ adpt->base + EMAC_DESC_CTRL_9);
+
+ /* RFD (Receive Free Descriptor) & RRD (Receive Return Descriptor) */
+ writel(upper_32_bits(adpt->rx_q.rfd.dma_addr),
+ adpt->base + EMAC_DESC_CTRL_0);
+
+ writel(lower_32_bits(adpt->rx_q.rfd.dma_addr),
+ adpt->base + rfd_q_offset[0]);
+ writel(lower_32_bits(adpt->rx_q.rrd.dma_addr),
+ adpt->base + rrd_q_offset[0]);
+
+ writel(adpt->rx_q.rfd.count & RFD_RING_SIZE_BMSK,
+ adpt->base + EMAC_DESC_CTRL_3);
+ writel(adpt->rx_q.rrd.count & RRD_RING_SIZE_BMSK,
+ adpt->base + EMAC_DESC_CTRL_6);
+
+ writel(adpt->rxbuf_size & RX_BUFFER_SIZE_BMSK,
+ adpt->base + EMAC_DESC_CTRL_4);
+
+ writel(0, adpt->base + EMAC_DESC_CTRL_11);
+
+ /* Load all of the base addresses above and ensure that triggering HW to
+ * read ring pointers is flushed
+ */
+ writel(1, adpt->base + EMAC_INTER_SRAM_PART9);
+}
+
+/* Config transmit parameters */
+static void emac_mac_tx_config(struct emac_adapter *adpt)
+{
+ u32 val;
+
+ writel((EMAC_MAX_TX_OFFLOAD_THRESH >> 3) &
+ JUMBO_TASK_OFFLOAD_THRESHOLD_BMSK, adpt->base + EMAC_TXQ_CTRL_1);
+
+ val = (adpt->tpd_burst << NUM_TPD_BURST_PREF_SHFT) &
+ NUM_TPD_BURST_PREF_BMSK;
+
+ val |= TXQ_MODE | LS_8023_SP;
+ val |= (0x0100 << NUM_TXF_BURST_PREF_SHFT) &
+ NUM_TXF_BURST_PREF_BMSK;
+
+ writel(val, adpt->base + EMAC_TXQ_CTRL_0);
+ emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_2,
+ (TXF_HWM_BMSK | TXF_LWM_BMSK), 0);
+}
+
+/* Config receive parameters */
+static void emac_mac_rx_config(struct emac_adapter *adpt)
+{
+ u32 val;
+
+ val = (adpt->rfd_burst << NUM_RFD_BURST_PREF_SHFT) &
+ NUM_RFD_BURST_PREF_BMSK;
+ val |= (SP_IPV6 | CUT_THRU_EN);
+
+ writel(val, adpt->base + EMAC_RXQ_CTRL_0);
+
+ val = readl(adpt->base + EMAC_RXQ_CTRL_1);
+ val &= ~(JUMBO_1KAH_BMSK | RFD_PREF_LOW_THRESHOLD_BMSK |
+ RFD_PREF_UP_THRESHOLD_BMSK);
+ val |= (JUMBO_1KAH << JUMBO_1KAH_SHFT) |
+ (RFD_PREF_LOW_TH << RFD_PREF_LOW_THRESHOLD_SHFT) |
+ (RFD_PREF_UP_TH << RFD_PREF_UP_THRESHOLD_SHFT);
+ writel(val, adpt->base + EMAC_RXQ_CTRL_1);
+
+ val = readl(adpt->base + EMAC_RXQ_CTRL_2);
+ val &= ~(RXF_DOF_THRESHOLD_BMSK | RXF_UOF_THRESHOLD_BMSK);
+ val |= (RXF_DOF_THRESFHOLD << RXF_DOF_THRESHOLD_SHFT) |
+ (RXF_UOF_THRESFHOLD << RXF_UOF_THRESHOLD_SHFT);
+ writel(val, adpt->base + EMAC_RXQ_CTRL_2);
+
+ val = readl(adpt->base + EMAC_RXQ_CTRL_3);
+ val &= ~(RXD_TIMER_BMSK | RXD_THRESHOLD_BMSK);
+ val |= RXD_TH << RXD_THRESHOLD_SHFT;
+ writel(val, adpt->base + EMAC_RXQ_CTRL_3);
+}
+
+/* Config dma */
+static void emac_mac_dma_config(struct emac_adapter *adpt)
+{
+ u32 dma_ctrl = DMAR_REQ_PRI;
+
+ switch (adpt->dma_order) {
+ case emac_dma_ord_in:
+ dma_ctrl |= IN_ORDER_MODE;
+ break;
+ case emac_dma_ord_enh:
+ dma_ctrl |= ENH_ORDER_MODE;
+ break;
+ case emac_dma_ord_out:
+ dma_ctrl |= OUT_ORDER_MODE;
+ break;
+ default:
+ break;
+ }
+
+ dma_ctrl |= (((u32)adpt->dmar_block) << REGRDBLEN_SHFT) &
+ REGRDBLEN_BMSK;
+ dma_ctrl |= (((u32)adpt->dmaw_block) << REGWRBLEN_SHFT) &
+ REGWRBLEN_BMSK;
+ dma_ctrl |= (((u32)adpt->dmar_dly_cnt) << DMAR_DLY_CNT_SHFT) &
+ DMAR_DLY_CNT_BMSK;
+ dma_ctrl |= (((u32)adpt->dmaw_dly_cnt) << DMAW_DLY_CNT_SHFT) &
+ DMAW_DLY_CNT_BMSK;
+
+ /* config DMA and ensure that configuration is flushed to HW */
+ writel(dma_ctrl, adpt->base + EMAC_DMA_CTRL);
+}
+
+/* set MAC address */
+static void emac_set_mac_address(struct emac_adapter *adpt, u8 *addr)
+{
+ u32 sta;
+
+ /* for example: 00-A0-C6-11-22-33
+ * 0<-->C6112233, 1<-->00A0.
+ */
+
+ /* low 32bit word */
+ sta = (((u32)addr[2]) << 24) | (((u32)addr[3]) << 16) |
+ (((u32)addr[4]) << 8) | (((u32)addr[5]));
+ writel(sta, adpt->base + EMAC_MAC_STA_ADDR0);
+
+ /* hight 32bit word */
+ sta = (((u32)addr[0]) << 8) | (u32)addr[1];
+ writel(sta, adpt->base + EMAC_MAC_STA_ADDR1);
+}
+
+static void emac_mac_config(struct emac_adapter *adpt)
+{
+ struct net_device *netdev = adpt->netdev;
+ unsigned int max_frame;
+ u32 val;
+
+ emac_set_mac_address(adpt, netdev->dev_addr);
+
+ max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
+ adpt->rxbuf_size = netdev->mtu > EMAC_DEF_RX_BUF_SIZE ?
+ ALIGN(max_frame, 8) : EMAC_DEF_RX_BUF_SIZE;
+
+ emac_mac_dma_rings_config(adpt);
+
+ writel(netdev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN,
+ adpt->base + EMAC_MAX_FRAM_LEN_CTRL);
+
+ emac_mac_tx_config(adpt);
+ emac_mac_rx_config(adpt);
+ emac_mac_dma_config(adpt);
+
+ val = readl(adpt->base + EMAC_AXI_MAST_CTRL);
+ val &= ~(DATA_BYTE_SWAP | MAX_BOUND);
+ val |= MAX_BTYPE;
+ writel(val, adpt->base + EMAC_AXI_MAST_CTRL);
+ writel(0, adpt->base + EMAC_CLK_GATE_CTRL);
+ writel(RX_UNCPL_INT_EN, adpt->base + EMAC_MISC_CTRL);
+}
+
+void emac_mac_reset(struct emac_adapter *adpt)
+{
+ emac_mac_stop(adpt);
+
+ emac_reg_update32(adpt->base + EMAC_DMA_MAS_CTRL, 0, SOFT_RST);
+ usleep_range(100, 150); /* reset may take up to 100usec */
+
+ /* interrupt clear-on-read */
+ emac_reg_update32(adpt->base + EMAC_DMA_MAS_CTRL, 0, INT_RD_CLR_EN);
+}
+
+void emac_mac_start(struct emac_adapter *adpt)
+{
+ struct phy_device *phydev = adpt->phydev;
+ u32 mac, csr1;
+
+ /* enable tx queue */
+ emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_0, 0, TXQ_EN);
+
+ /* enable rx queue */
+ emac_reg_update32(adpt->base + EMAC_RXQ_CTRL_0, 0, RXQ_EN);
+
+ /* enable mac control */
+ mac = readl(adpt->base + EMAC_MAC_CTRL);
+ csr1 = readl(adpt->csr + EMAC_EMAC_WRAPPER_CSR1);
+
+ mac |= TXEN | RXEN; /* enable RX/TX */
+
+ /* We don't have ethtool support yet, so force flow-control mode
+ * to 'full' always.
+ */
+ mac |= TXFC | RXFC;
+
+ /* setup link speed */
+ mac &= ~SPEED_MASK;
+ if (phydev->speed == SPEED_1000) {
+ mac |= SPEED(2);
+ csr1 |= FREQ_MODE;
+ } else {
+ mac |= SPEED(1);
+ csr1 &= ~FREQ_MODE;
+ }
+
+ if (phydev->duplex == DUPLEX_FULL)
+ mac |= FULLD;
+ else
+ mac &= ~FULLD;
+
+ /* other parameters */
+ mac |= (CRCE | PCRCE);
+ mac |= ((adpt->preamble << PRLEN_SHFT) & PRLEN_BMSK);
+ mac |= BROAD_EN;
+ mac |= FLCHK;
+ mac &= ~RX_CHKSUM_EN;
+ mac &= ~(HUGEN | VLAN_STRIP | TPAUSE | SIMR | HUGE | MULTI_ALL |
+ DEBUG_MODE | SINGLE_PAUSE_MODE);
+
+ writel_relaxed(csr1, adpt->csr + EMAC_EMAC_WRAPPER_CSR1);
+
+ writel_relaxed(mac, adpt->base + EMAC_MAC_CTRL);
+
+ /* enable interrupt read clear, low power sleep mode and
+ * the irq moderators
+ */
+
+ writel_relaxed(adpt->irq_mod, adpt->base + EMAC_IRQ_MOD_TIM_INIT);
+ writel_relaxed(INT_RD_CLR_EN | LPW_MODE | IRQ_MODERATOR_EN |
+ IRQ_MODERATOR2_EN, adpt->base + EMAC_DMA_MAS_CTRL);
+
+ emac_mac_mode_config(adpt);
+
+ emac_reg_update32(adpt->base + EMAC_ATHR_HEADER_CTRL,
+ (HEADER_ENABLE | HEADER_CNT_EN), 0);
+
+ emac_reg_update32(adpt->csr + EMAC_EMAC_WRAPPER_CSR2, 0, WOL_EN);
+}
+
+void emac_mac_stop(struct emac_adapter *adpt)
+{
+ emac_reg_update32(adpt->base + EMAC_RXQ_CTRL_0, RXQ_EN, 0);
+ emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_0, TXQ_EN, 0);
+ emac_reg_update32(adpt->base + EMAC_MAC_CTRL, TXEN | RXEN, 0);
+ usleep_range(1000, 1050); /* stopping mac may take upto 1msec */
+}
+
+/* Free all descriptors of given transmit queue */
+static void emac_tx_q_descs_free(struct emac_adapter *adpt)
+{
+ struct emac_tx_queue *tx_q = &adpt->tx_q;
+ unsigned int i;
+ size_t size;
+
+ /* ring already cleared, nothing to do */
+ if (!tx_q->tpd.tpbuff)
+ return;
+
+ for (i = 0; i < tx_q->tpd.count; i++) {
+ struct emac_buffer *tpbuf = GET_TPD_BUFFER(tx_q, i);
+
+ if (tpbuf->dma_addr) {
+ dma_unmap_single(adpt->netdev->dev.parent,
+ tpbuf->dma_addr, tpbuf->length,
+ DMA_TO_DEVICE);
+ tpbuf->dma_addr = 0;
+ }
+ if (tpbuf->skb) {
+ dev_kfree_skb_any(tpbuf->skb);
+ tpbuf->skb = NULL;
+ }
+ }
+
+ size = sizeof(struct emac_buffer) * tx_q->tpd.count;
+ memset(tx_q->tpd.tpbuff, 0, size);
+
+ /* clear the descriptor ring */
+ memset(tx_q->tpd.v_addr, 0, tx_q->tpd.size);
+
+ tx_q->tpd.consume_idx = 0;
+ tx_q->tpd.produce_idx = 0;
+}
+
+/* Free all descriptors of given receive queue */
+static void emac_rx_q_free_descs(struct emac_adapter *adpt)
+{
+ struct device *dev = adpt->netdev->dev.parent;
+ struct emac_rx_queue *rx_q = &adpt->rx_q;
+ unsigned int i;
+ size_t size;
+
+ /* ring already cleared, nothing to do */
+ if (!rx_q->rfd.rfbuff)
+ return;
+
+ for (i = 0; i < rx_q->rfd.count; i++) {
+ struct emac_buffer *rfbuf = GET_RFD_BUFFER(rx_q, i);
+
+ if (rfbuf->dma_addr) {
+ dma_unmap_single(dev, rfbuf->dma_addr, rfbuf->length,
+ DMA_FROM_DEVICE);
+ rfbuf->dma_addr = 0;
+ }
+ if (rfbuf->skb) {
+ dev_kfree_skb(rfbuf->skb);
+ rfbuf->skb = NULL;
+ }
+ }
+
+ size = sizeof(struct emac_buffer) * rx_q->rfd.count;
+ memset(rx_q->rfd.rfbuff, 0, size);
+
+ /* clear the descriptor rings */
+ memset(rx_q->rrd.v_addr, 0, rx_q->rrd.size);
+ rx_q->rrd.produce_idx = 0;
+ rx_q->rrd.consume_idx = 0;
+
+ memset(rx_q->rfd.v_addr, 0, rx_q->rfd.size);
+ rx_q->rfd.produce_idx = 0;
+ rx_q->rfd.consume_idx = 0;
+}
+
+/* Free all buffers associated with given transmit queue */
+static void emac_tx_q_bufs_free(struct emac_adapter *adpt)
+{
+ struct emac_tx_queue *tx_q = &adpt->tx_q;
+
+ emac_tx_q_descs_free(adpt);
+
+ kfree(tx_q->tpd.tpbuff);
+ tx_q->tpd.tpbuff = NULL;
+ tx_q->tpd.v_addr = NULL;
+ tx_q->tpd.dma_addr = 0;
+ tx_q->tpd.size = 0;
+}
+
+/* Allocate TX descriptor ring for the given transmit queue */
+static int emac_tx_q_desc_alloc(struct emac_adapter *adpt,
+ struct emac_tx_queue *tx_q)
+{
+ struct emac_ring_header *ring_header = &adpt->ring_header;
+ size_t size;
+
+ size = sizeof(struct emac_buffer) * tx_q->tpd.count;
+ tx_q->tpd.tpbuff = kzalloc(size, GFP_KERNEL);
+ if (!tx_q->tpd.tpbuff)
+ return -ENOMEM;
+
+ tx_q->tpd.size = tx_q->tpd.count * (adpt->tpd_size * 4);
+ tx_q->tpd.dma_addr = ring_header->dma_addr + ring_header->used;
+ tx_q->tpd.v_addr = ring_header->v_addr + ring_header->used;
+ ring_header->used += ALIGN(tx_q->tpd.size, 8);
+ tx_q->tpd.produce_idx = 0;
+ tx_q->tpd.consume_idx = 0;
+
+ return 0;
+}
+
+/* Free all buffers associated with given transmit queue */
+static void emac_rx_q_bufs_free(struct emac_adapter *adpt)
+{
+ struct emac_rx_queue *rx_q = &adpt->rx_q;
+
+ emac_rx_q_free_descs(adpt);
+
+ kfree(rx_q->rfd.rfbuff);
+ rx_q->rfd.rfbuff = NULL;
+
+ rx_q->rfd.v_addr = NULL;
+ rx_q->rfd.dma_addr = 0;
+ rx_q->rfd.size = 0;
+
+ rx_q->rrd.v_addr = NULL;
+ rx_q->rrd.dma_addr = 0;
+ rx_q->rrd.size = 0;
+}
+
+/* Allocate RX descriptor rings for the given receive queue */
+static int emac_rx_descs_alloc(struct emac_adapter *adpt)
+{
+ struct emac_ring_header *ring_header = &adpt->ring_header;
+ struct emac_rx_queue *rx_q = &adpt->rx_q;
+ size_t size;
+
+ size = sizeof(struct emac_buffer) * rx_q->rfd.count;
+ rx_q->rfd.rfbuff = kzalloc(size, GFP_KERNEL);
+ if (!rx_q->rfd.rfbuff)
+ return -ENOMEM;
+
+ rx_q->rrd.size = rx_q->rrd.count * (adpt->rrd_size * 4);
+ rx_q->rfd.size = rx_q->rfd.count * (adpt->rfd_size * 4);
+
+ rx_q->rrd.dma_addr = ring_header->dma_addr + ring_header->used;
+ rx_q->rrd.v_addr = ring_header->v_addr + ring_header->used;
+ ring_header->used += ALIGN(rx_q->rrd.size, 8);
+
+ rx_q->rfd.dma_addr = ring_header->dma_addr + ring_header->used;
+ rx_q->rfd.v_addr = ring_header->v_addr + ring_header->used;
+ ring_header->used += ALIGN(rx_q->rfd.size, 8);
+
+ rx_q->rrd.produce_idx = 0;
+ rx_q->rrd.consume_idx = 0;
+
+ rx_q->rfd.produce_idx = 0;
+ rx_q->rfd.consume_idx = 0;
+
+ return 0;
+}
+
+/* Allocate all TX and RX descriptor rings */
+int emac_mac_rx_tx_rings_alloc_all(struct emac_adapter *adpt)
+{
+ struct emac_ring_header *ring_header = &adpt->ring_header;
+ struct device *dev = adpt->netdev->dev.parent;
+ unsigned int num_tx_descs = adpt->tx_desc_cnt;
+ unsigned int num_rx_descs = adpt->rx_desc_cnt;
+ int ret;
+
+ adpt->tx_q.tpd.count = adpt->tx_desc_cnt;
+
+ adpt->rx_q.rrd.count = adpt->rx_desc_cnt;
+ adpt->rx_q.rfd.count = adpt->rx_desc_cnt;
+
+ /* Ring DMA buffer. Each ring may need up to 8 bytes for alignment,
+ * hence the additional padding bytes are allocated.
+ */
+ ring_header->size = num_tx_descs * (adpt->tpd_size * 4) +
+ num_rx_descs * (adpt->rfd_size * 4) +
+ num_rx_descs * (adpt->rrd_size * 4) +
+ 8 + 2 * 8; /* 8 byte per one Tx and two Rx rings */
+
+ ring_header->used = 0;
+ ring_header->v_addr = dma_zalloc_coherent(dev, ring_header->size,
+ &ring_header->dma_addr,
+ GFP_KERNEL);
+ if (!ring_header->v_addr)
+ return -ENOMEM;
+
+ ring_header->used = ALIGN(ring_header->dma_addr, 8) -
+ ring_header->dma_addr;
+
+ ret = emac_tx_q_desc_alloc(adpt, &adpt->tx_q);
+ if (ret) {
+ netdev_err(adpt->netdev, "error: Tx Queue alloc failed\n");
+ goto err_alloc_tx;
+ }
+
+ ret = emac_rx_descs_alloc(adpt);
+ if (ret) {
+ netdev_err(adpt->netdev, "error: Rx Queue alloc failed\n");
+ goto err_alloc_rx;
+ }
+
+ return 0;
+
+err_alloc_rx:
+ emac_tx_q_bufs_free(adpt);
+err_alloc_tx:
+ dma_free_coherent(dev, ring_header->size,
+ ring_header->v_addr, ring_header->dma_addr);
+
+ ring_header->v_addr = NULL;
+ ring_header->dma_addr = 0;
+ ring_header->size = 0;
+ ring_header->used = 0;
+
+ return ret;
+}
+
+/* Free all TX and RX descriptor rings */
+void emac_mac_rx_tx_rings_free_all(struct emac_adapter *adpt)
+{
+ struct emac_ring_header *ring_header = &adpt->ring_header;
+ struct device *dev = adpt->netdev->dev.parent;
+
+ emac_tx_q_bufs_free(adpt);
+ emac_rx_q_bufs_free(adpt);
+
+ dma_free_coherent(dev, ring_header->size,
+ ring_header->v_addr, ring_header->dma_addr);
+
+ ring_header->v_addr = NULL;
+ ring_header->dma_addr = 0;
+ ring_header->size = 0;
+ ring_header->used = 0;
+}
+
+/* Initialize descriptor rings */
+static void emac_mac_rx_tx_ring_reset_all(struct emac_adapter *adpt)
+{
+ unsigned int i;
+
+ adpt->tx_q.tpd.produce_idx = 0;
+ adpt->tx_q.tpd.consume_idx = 0;
+ for (i = 0; i < adpt->tx_q.tpd.count; i++)
+ adpt->tx_q.tpd.tpbuff[i].dma_addr = 0;
+
+ adpt->rx_q.rrd.produce_idx = 0;
+ adpt->rx_q.rrd.consume_idx = 0;
+ adpt->rx_q.rfd.produce_idx = 0;
+ adpt->rx_q.rfd.consume_idx = 0;
+ for (i = 0; i < adpt->rx_q.rfd.count; i++)
+ adpt->rx_q.rfd.rfbuff[i].dma_addr = 0;
+}
+
+/* Produce new receive free descriptor */
+static void emac_mac_rx_rfd_create(struct emac_adapter *adpt,
+ struct emac_rx_queue *rx_q,
+ dma_addr_t addr)
+{
+ u32 *hw_rfd = EMAC_RFD(rx_q, adpt->rfd_size, rx_q->rfd.produce_idx);
+
+ *(hw_rfd++) = lower_32_bits(addr);
+ *hw_rfd = upper_32_bits(addr);
+
+ if (++rx_q->rfd.produce_idx == rx_q->rfd.count)
+ rx_q->rfd.produce_idx = 0;
+}
+
+/* Fill up receive queue's RFD with preallocated receive buffers */
+static void emac_mac_rx_descs_refill(struct emac_adapter *adpt,
+ struct emac_rx_queue *rx_q)
+{
+ struct emac_buffer *curr_rxbuf;
+ struct emac_buffer *next_rxbuf;
+ unsigned int count = 0;
+ u32 next_produce_idx;
+
+ next_produce_idx = rx_q->rfd.produce_idx + 1;
+ if (next_produce_idx == rx_q->rfd.count)
+ next_produce_idx = 0;
+
+ curr_rxbuf = GET_RFD_BUFFER(rx_q, rx_q->rfd.produce_idx);
+ next_rxbuf = GET_RFD_BUFFER(rx_q, next_produce_idx);
+
+ /* this always has a blank rx_buffer*/
+ while (!next_rxbuf->dma_addr) {
+ struct sk_buff *skb;
+ int ret;
+
+ skb = netdev_alloc_skb_ip_align(adpt->netdev, adpt->rxbuf_size);
+ if (!skb)
+ break;
+
+ curr_rxbuf->dma_addr =
+ dma_map_single(adpt->netdev->dev.parent, skb->data,
+ curr_rxbuf->length, DMA_FROM_DEVICE);
+ ret = dma_mapping_error(adpt->netdev->dev.parent,
+ curr_rxbuf->dma_addr);
+ if (ret) {
+ dev_kfree_skb(skb);
+ break;
+ }
+ curr_rxbuf->skb = skb;
+ curr_rxbuf->length = adpt->rxbuf_size;
+
+ emac_mac_rx_rfd_create(adpt, rx_q, curr_rxbuf->dma_addr);
+ next_produce_idx = rx_q->rfd.produce_idx + 1;
+ if (next_produce_idx == rx_q->rfd.count)
+ next_produce_idx = 0;
+
+ curr_rxbuf = GET_RFD_BUFFER(rx_q, rx_q->rfd.produce_idx);
+ next_rxbuf = GET_RFD_BUFFER(rx_q, next_produce_idx);
+ count++;
+ }
+
+ if (count) {
+ u32 prod_idx = (rx_q->rfd.produce_idx << rx_q->produce_shift) &
+ rx_q->produce_mask;
+ emac_reg_update32(adpt->base + rx_q->produce_reg,
+ rx_q->produce_mask, prod_idx);
+ }
+}
+
+static void emac_adjust_link(struct net_device *netdev)
+{
+ struct emac_adapter *adpt = netdev_priv(netdev);
+ struct phy_device *phydev = netdev->phydev;
+
+ if (phydev->link)
+ emac_mac_start(adpt);
+ else
+ emac_mac_stop(adpt);
+
+ phy_print_status(phydev);
+}
+
+/* Bringup the interface/HW */
+int emac_mac_up(struct emac_adapter *adpt)
+{
+ struct net_device *netdev = adpt->netdev;
+ struct emac_irq *irq = &adpt->irq;
+ int ret;
+
+ emac_mac_rx_tx_ring_reset_all(adpt);
+ emac_mac_config(adpt);
+
+ ret = request_irq(irq->irq, emac_isr, 0, EMAC_MAC_IRQ_RES, irq);
+ if (ret) {
+ netdev_err(adpt->netdev, "could not request %s irq\n",
+ EMAC_MAC_IRQ_RES);
+ return ret;
+ }
+
+ emac_mac_rx_descs_refill(adpt, &adpt->rx_q);
+
+ ret = phy_connect_direct(netdev, adpt->phydev, emac_adjust_link,
+ PHY_INTERFACE_MODE_SGMII);
+ if (ret) {
+ netdev_err(adpt->netdev, "could not connect phy\n");
+ free_irq(irq->irq, irq);
+ return ret;
+ }
+
+ /* enable mac irq */
+ writel((u32)~DIS_INT, adpt->base + EMAC_INT_STATUS);
+ writel(adpt->irq.mask, adpt->base + EMAC_INT_MASK);
+
+ adpt->phydev->irq = PHY_IGNORE_INTERRUPT;
+ phy_start(adpt->phydev);
+
+ napi_enable(&adpt->rx_q.napi);
+ netif_start_queue(netdev);
+
+ return 0;
+}
+
+/* Bring down the interface/HW */
+void emac_mac_down(struct emac_adapter *adpt)
+{
+ struct net_device *netdev = adpt->netdev;
+
+ netif_stop_queue(netdev);
+ napi_disable(&adpt->rx_q.napi);
+
+ phy_stop(adpt->phydev);
+ phy_disconnect(adpt->phydev);
+
+ /* disable mac irq */
+ writel(DIS_INT, adpt->base + EMAC_INT_STATUS);
+ writel(0, adpt->base + EMAC_INT_MASK);
+ synchronize_irq(adpt->irq.irq);
+ free_irq(adpt->irq.irq, &adpt->irq);
+
+ emac_mac_reset(adpt);
+
+ emac_tx_q_descs_free(adpt);
+ netdev_reset_queue(adpt->netdev);
+ emac_rx_q_free_descs(adpt);
+}
+
+/* Consume next received packet descriptor */
+static bool emac_rx_process_rrd(struct emac_adapter *adpt,
+ struct emac_rx_queue *rx_q,
+ struct emac_rrd *rrd)
+{
+ u32 *hw_rrd = EMAC_RRD(rx_q, adpt->rrd_size, rx_q->rrd.consume_idx);
+
+ rrd->word[3] = *(hw_rrd + 3);
+
+ if (!RRD_UPDT(rrd))
+ return false;
+
+ rrd->word[4] = 0;
+ rrd->word[5] = 0;
+
+ rrd->word[0] = *(hw_rrd++);
+ rrd->word[1] = *(hw_rrd++);
+ rrd->word[2] = *(hw_rrd++);
+
+ if (unlikely(RRD_NOR(rrd) != 1)) {
+ netdev_err(adpt->netdev,
+ "error: multi-RFD not support yet! nor:%lu\n",
+ RRD_NOR(rrd));
+ }
+
+ /* mark rrd as processed */
+ RRD_UPDT_SET(rrd, 0);
+ *hw_rrd = rrd->word[3];
+
+ if (++rx_q->rrd.consume_idx == rx_q->rrd.count)
+ rx_q->rrd.consume_idx = 0;
+
+ return true;
+}
+
+/* Produce new transmit descriptor */
+static void emac_tx_tpd_create(struct emac_adapter *adpt,
+ struct emac_tx_queue *tx_q, struct emac_tpd *tpd)
+{
+ u32 *hw_tpd;
+
+ tx_q->tpd.last_produce_idx = tx_q->tpd.produce_idx;
+ hw_tpd = EMAC_TPD(tx_q, adpt->tpd_size, tx_q->tpd.produce_idx);
+
+ if (++tx_q->tpd.produce_idx == tx_q->tpd.count)
+ tx_q->tpd.produce_idx = 0;
+
+ *(hw_tpd++) = tpd->word[0];
+ *(hw_tpd++) = tpd->word[1];
+ *(hw_tpd++) = tpd->word[2];
+ *hw_tpd = tpd->word[3];
+}
+
+/* Mark the last transmit descriptor as such (for the transmit packet) */
+static void emac_tx_tpd_mark_last(struct emac_adapter *adpt,
+ struct emac_tx_queue *tx_q)
+{
+ u32 *hw_tpd =
+ EMAC_TPD(tx_q, adpt->tpd_size, tx_q->tpd.last_produce_idx);
+ u32 tmp_tpd;
+
+ tmp_tpd = *(hw_tpd + 1);
+ tmp_tpd |= EMAC_TPD_LAST_FRAGMENT;
+ *(hw_tpd + 1) = tmp_tpd;
+}
+
+static void emac_rx_rfd_clean(struct emac_rx_queue *rx_q, struct emac_rrd *rrd)
+{
+ struct emac_buffer *rfbuf = rx_q->rfd.rfbuff;
+ u32 consume_idx = RRD_SI(rrd);
+ unsigned int i;
+
+ for (i = 0; i < RRD_NOR(rrd); i++) {
+ rfbuf[consume_idx].skb = NULL;
+ if (++consume_idx == rx_q->rfd.count)
+ consume_idx = 0;
+ }
+
+ rx_q->rfd.consume_idx = consume_idx;
+ rx_q->rfd.process_idx = consume_idx;
+}
+
+/* Push the received skb to upper layers */
+static void emac_receive_skb(struct emac_rx_queue *rx_q,
+ struct sk_buff *skb,
+ u16 vlan_tag, bool vlan_flag)
+{
+ if (vlan_flag) {
+ u16 vlan;
+
+ EMAC_TAG_TO_VLAN(vlan_tag, vlan);
+ __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan);
+ }
+
+ napi_gro_receive(&rx_q->napi, skb);
+}
+
+/* Process receive event */
+void emac_mac_rx_process(struct emac_adapter *adpt, struct emac_rx_queue *rx_q,
+ int *num_pkts, int max_pkts)
+{
+ u32 proc_idx, hw_consume_idx, num_consume_pkts;
+ struct net_device *netdev = adpt->netdev;
+ struct emac_buffer *rfbuf;
+ unsigned int count = 0;
+ struct emac_rrd rrd;
+ struct sk_buff *skb;
+ u32 reg;
+
+ reg = readl_relaxed(adpt->base + rx_q->consume_reg);
+
+ hw_consume_idx = (reg & rx_q->consume_mask) >> rx_q->consume_shift;
+ num_consume_pkts = (hw_consume_idx >= rx_q->rrd.consume_idx) ?
+ (hw_consume_idx - rx_q->rrd.consume_idx) :
+ (hw_consume_idx + rx_q->rrd.count - rx_q->rrd.consume_idx);
+
+ do {
+ if (!num_consume_pkts)
+ break;
+
+ if (!emac_rx_process_rrd(adpt, rx_q, &rrd))
+ break;
+
+ if (likely(RRD_NOR(&rrd) == 1)) {
+ /* good receive */
+ rfbuf = GET_RFD_BUFFER(rx_q, RRD_SI(&rrd));
+ dma_unmap_single(adpt->netdev->dev.parent,
+ rfbuf->dma_addr, rfbuf->length,
+ DMA_FROM_DEVICE);
+ rfbuf->dma_addr = 0;
+ skb = rfbuf->skb;
+ } else {
+ netdev_err(adpt->netdev,
+ "error: multi-RFD not support yet!\n");
+ break;
+ }
+ emac_rx_rfd_clean(rx_q, &rrd);
+ num_consume_pkts--;
+ count++;
+
+ /* Due to a HW issue in L4 check sum detection (UDP/TCP frags
+ * with DF set are marked as error), drop packets based on the
+ * error mask rather than the summary bit (ignoring L4F errors)
+ */
+ if (rrd.word[EMAC_RRD_STATS_DW_IDX] & EMAC_RRD_ERROR) {
+ netif_dbg(adpt, rx_status, adpt->netdev,
+ "Drop error packet[RRD: 0x%x:0x%x:0x%x:0x%x]\n",
+ rrd.word[0], rrd.word[1],
+ rrd.word[2], rrd.word[3]);
+
+ dev_kfree_skb(skb);
+ continue;
+ }
+
+ skb_put(skb, RRD_PKT_SIZE(&rrd) - ETH_FCS_LEN);
+ skb->dev = netdev;
+ skb->protocol = eth_type_trans(skb, skb->dev);
+ if (netdev->features & NETIF_F_RXCSUM)
+ skb->ip_summed = RRD_L4F(&rrd) ?
+ CHECKSUM_NONE : CHECKSUM_UNNECESSARY;
+ else
+ skb_checksum_none_assert(skb);
+
+ emac_receive_skb(rx_q, skb, (u16)RRD_CVALN_TAG(&rrd),
+ (bool)RRD_CVTAG(&rrd));
+
+ netdev->last_rx = jiffies;
+ (*num_pkts)++;
+ } while (*num_pkts < max_pkts);
+
+ if (count) {
+ proc_idx = (rx_q->rfd.process_idx << rx_q->process_shft) &
+ rx_q->process_mask;
+ emac_reg_update32(adpt->base + rx_q->process_reg,
+ rx_q->process_mask, proc_idx);
+ emac_mac_rx_descs_refill(adpt, rx_q);
+ }
+}
+
+/* get the number of free transmit descriptors */
+static unsigned int emac_tpd_num_free_descs(struct emac_tx_queue *tx_q)
+{
+ u32 produce_idx = tx_q->tpd.produce_idx;
+ u32 consume_idx = tx_q->tpd.consume_idx;
+
+ return (consume_idx > produce_idx) ?
+ (consume_idx - produce_idx - 1) :
+ (tx_q->tpd.count + consume_idx - produce_idx - 1);
+}
+
+/* Process transmit event */
+void emac_mac_tx_process(struct emac_adapter *adpt, struct emac_tx_queue *tx_q)
+{
+ u32 reg = readl_relaxed(adpt->base + tx_q->consume_reg);
+ u32 hw_consume_idx, pkts_compl = 0, bytes_compl = 0;
+ struct emac_buffer *tpbuf;
+
+ hw_consume_idx = (reg & tx_q->consume_mask) >> tx_q->consume_shift;
+
+ while (tx_q->tpd.consume_idx != hw_consume_idx) {
+ tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.consume_idx);
+ if (tpbuf->dma_addr) {
+ dma_unmap_single(adpt->netdev->dev.parent,
+ tpbuf->dma_addr, tpbuf->length,
+ DMA_TO_DEVICE);
+ tpbuf->dma_addr = 0;
+ }
+
+ if (tpbuf->skb) {
+ pkts_compl++;
+ bytes_compl += tpbuf->skb->len;
+ dev_kfree_skb_irq(tpbuf->skb);
+ tpbuf->skb = NULL;
+ }
+
+ if (++tx_q->tpd.consume_idx == tx_q->tpd.count)
+ tx_q->tpd.consume_idx = 0;
+ }
+
+ netdev_completed_queue(adpt->netdev, pkts_compl, bytes_compl);
+
+ if (netif_queue_stopped(adpt->netdev))
+ if (emac_tpd_num_free_descs(tx_q) > (MAX_SKB_FRAGS + 1))
+ netif_wake_queue(adpt->netdev);
+}
+
+/* Initialize all queue data structures */
+void emac_mac_rx_tx_ring_init_all(struct platform_device *pdev,
+ struct emac_adapter *adpt)
+{
+ adpt->rx_q.netdev = adpt->netdev;
+
+ adpt->rx_q.produce_reg = EMAC_MAILBOX_0;
+ adpt->rx_q.produce_mask = RFD0_PROD_IDX_BMSK;
+ adpt->rx_q.produce_shift = RFD0_PROD_IDX_SHFT;
+
+ adpt->rx_q.process_reg = EMAC_MAILBOX_0;
+ adpt->rx_q.process_mask = RFD0_PROC_IDX_BMSK;
+ adpt->rx_q.process_shft = RFD0_PROC_IDX_SHFT;
+
+ adpt->rx_q.consume_reg = EMAC_MAILBOX_3;
+ adpt->rx_q.consume_mask = RFD0_CONS_IDX_BMSK;
+ adpt->rx_q.consume_shift = RFD0_CONS_IDX_SHFT;
+
+ adpt->rx_q.irq = &adpt->irq;
+ adpt->rx_q.intr = adpt->irq.mask & ISR_RX_PKT;
+
+ adpt->tx_q.produce_reg = EMAC_MAILBOX_15;
+ adpt->tx_q.produce_mask = NTPD_PROD_IDX_BMSK;
+ adpt->tx_q.produce_shift = NTPD_PROD_IDX_SHFT;
+
+ adpt->tx_q.consume_reg = EMAC_MAILBOX_2;
+ adpt->tx_q.consume_mask = NTPD_CONS_IDX_BMSK;
+ adpt->tx_q.consume_shift = NTPD_CONS_IDX_SHFT;
+}
+
+/* Fill up transmit descriptors with TSO and Checksum offload information */
+static int emac_tso_csum(struct emac_adapter *adpt,
+ struct emac_tx_queue *tx_q,
+ struct sk_buff *skb,
+ struct emac_tpd *tpd)
+{
+ unsigned int hdr_len;
+ int ret;
+
+ if (skb_is_gso(skb)) {
+ if (skb_header_cloned(skb)) {
+ ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
+ if (unlikely(ret))
+ return ret;
+ }
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ u32 pkt_len = ((unsigned char *)ip_hdr(skb) - skb->data)
+ + ntohs(ip_hdr(skb)->tot_len);
+ if (skb->len > pkt_len)
+ pskb_trim(skb, pkt_len);
+ }
+
+ hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
+ if (unlikely(skb->len == hdr_len)) {
+ /* we only need to do csum */
+ netif_warn(adpt, tx_err, adpt->netdev,
+ "tso not needed for packet with 0 data\n");
+ goto do_csum;
+ }
+
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
+ ip_hdr(skb)->check = 0;
+ tcp_hdr(skb)->check =
+ ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
+ ip_hdr(skb)->daddr,
+ 0, IPPROTO_TCP, 0);
+ TPD_IPV4_SET(tpd, 1);
+ }
+
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
+ /* ipv6 tso need an extra tpd */
+ struct emac_tpd extra_tpd;
+
+ memset(tpd, 0, sizeof(*tpd));
+ memset(&extra_tpd, 0, sizeof(extra_tpd));
+
+ ipv6_hdr(skb)->payload_len = 0;
+ tcp_hdr(skb)->check =
+ ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ 0, IPPROTO_TCP, 0);
+ TPD_PKT_LEN_SET(&extra_tpd, skb->len);
+ TPD_LSO_SET(&extra_tpd, 1);
+ TPD_LSOV_SET(&extra_tpd, 1);
+ emac_tx_tpd_create(adpt, tx_q, &extra_tpd);
+ TPD_LSOV_SET(tpd, 1);
+ }
+
+ TPD_LSO_SET(tpd, 1);
+ TPD_TCPHDR_OFFSET_SET(tpd, skb_transport_offset(skb));
+ TPD_MSS_SET(tpd, skb_shinfo(skb)->gso_size);
+ return 0;
+ }
+
+do_csum:
+ if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
+ unsigned int css, cso;
+
+ cso = skb_transport_offset(skb);
+ if (unlikely(cso & 0x1)) {
+ netdev_err(adpt->netdev,
+ "error: payload offset should be even\n");
+ return -EINVAL;
+ }
+ css = cso + skb->csum_offset;
+
+ TPD_PAYLOAD_OFFSET_SET(tpd, cso >> 1);
+ TPD_CXSUM_OFFSET_SET(tpd, css >> 1);
+ TPD_CSX_SET(tpd, 1);
+ }
+
+ return 0;
+}
+
+/* Fill up transmit descriptors */
+static void emac_tx_fill_tpd(struct emac_adapter *adpt,
+ struct emac_tx_queue *tx_q, struct sk_buff *skb,
+ struct emac_tpd *tpd)
+{
+ unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
+ unsigned int first = tx_q->tpd.produce_idx;
+ unsigned int len = skb_headlen(skb);
+ struct emac_buffer *tpbuf = NULL;
+ unsigned int mapped_len = 0;
+ unsigned int i;
+ int count = 0;
+ int ret;
+
+ /* if Large Segment Offload is (in TCP Segmentation Offload struct) */
+ if (TPD_LSO(tpd)) {
+ mapped_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
+
+ tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx);
+ tpbuf->length = mapped_len;
+ tpbuf->dma_addr = dma_map_single(adpt->netdev->dev.parent,
+ skb->data, tpbuf->length,
+ DMA_TO_DEVICE);
+ ret = dma_mapping_error(adpt->netdev->dev.parent,
+ tpbuf->dma_addr);
+ if (ret)
+ goto error;
+
+ TPD_BUFFER_ADDR_L_SET(tpd, lower_32_bits(tpbuf->dma_addr));
+ TPD_BUFFER_ADDR_H_SET(tpd, upper_32_bits(tpbuf->dma_addr));
+ TPD_BUF_LEN_SET(tpd, tpbuf->length);
+ emac_tx_tpd_create(adpt, tx_q, tpd);
+ count++;
+ }
+
+ if (mapped_len < len) {
+ tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx);
+ tpbuf->length = len - mapped_len;
+ tpbuf->dma_addr = dma_map_single(adpt->netdev->dev.parent,
+ skb->data + mapped_len,
+ tpbuf->length, DMA_TO_DEVICE);
+ ret = dma_mapping_error(adpt->netdev->dev.parent,
+ tpbuf->dma_addr);
+ if (ret)
+ goto error;
+
+ TPD_BUFFER_ADDR_L_SET(tpd, lower_32_bits(tpbuf->dma_addr));
+ TPD_BUFFER_ADDR_H_SET(tpd, upper_32_bits(tpbuf->dma_addr));
+ TPD_BUF_LEN_SET(tpd, tpbuf->length);
+ emac_tx_tpd_create(adpt, tx_q, tpd);
+ count++;
+ }
+
+ for (i = 0; i < nr_frags; i++) {
+ struct skb_frag_struct *frag;
+
+ frag = &skb_shinfo(skb)->frags[i];
+
+ tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx);
+ tpbuf->length = frag->size;
+ tpbuf->dma_addr = dma_map_page(adpt->netdev->dev.parent,
+ frag->page.p, frag->page_offset,
+ tpbuf->length, DMA_TO_DEVICE);
+ ret = dma_mapping_error(adpt->netdev->dev.parent,
+ tpbuf->dma_addr);
+ if (ret)
+ goto error;
+
+ TPD_BUFFER_ADDR_L_SET(tpd, lower_32_bits(tpbuf->dma_addr));
+ TPD_BUFFER_ADDR_H_SET(tpd, upper_32_bits(tpbuf->dma_addr));
+ TPD_BUF_LEN_SET(tpd, tpbuf->length);
+ emac_tx_tpd_create(adpt, tx_q, tpd);
+ count++;
+ }
+
+ /* The last tpd */
+ wmb();
+ emac_tx_tpd_mark_last(adpt, tx_q);
+
+ /* The last buffer info contain the skb address,
+ * so it will be freed after unmap
+ */
+ tpbuf->skb = skb;
+
+ return;
+
+error:
+ /* One of the memory mappings failed, so undo everything */
+ tx_q->tpd.produce_idx = first;
+
+ while (count--) {
+ tpbuf = GET_TPD_BUFFER(tx_q, first);
+ dma_unmap_page(adpt->netdev->dev.parent, tpbuf->dma_addr,
+ tpbuf->length, DMA_TO_DEVICE);
+ tpbuf->dma_addr = 0;
+ tpbuf->length = 0;
+
+ if (++first == tx_q->tpd.count)
+ first = 0;
+ }
+
+ dev_kfree_skb(skb);
+}
+
+/* Transmit the packet using specified transmit queue */
+int emac_mac_tx_buf_send(struct emac_adapter *adpt, struct emac_tx_queue *tx_q,
+ struct sk_buff *skb)
+{
+ struct emac_tpd tpd;
+ u32 prod_idx;
+
+ memset(&tpd, 0, sizeof(tpd));
+
+ if (emac_tso_csum(adpt, tx_q, skb, &tpd) != 0) {
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ }
+
+ if (skb_vlan_tag_present(skb)) {
+ u16 tag;
+
+ EMAC_VLAN_TO_TAG(skb_vlan_tag_get(skb), tag);
+ TPD_CVLAN_TAG_SET(&tpd, tag);
+ TPD_INSTC_SET(&tpd, 1);
+ }
+
+ if (skb_network_offset(skb) != ETH_HLEN)
+ TPD_TYP_SET(&tpd, 1);
+
+ emac_tx_fill_tpd(adpt, tx_q, skb, &tpd);
+
+ netdev_sent_queue(adpt->netdev, skb->len);
+
+ /* Make sure the are enough free descriptors to hold one
+ * maximum-sized SKB. We need one desc for each fragment,
+ * one for the checksum (emac_tso_csum), one for TSO, and
+ * and one for the SKB header.
+ */
+ if (emac_tpd_num_free_descs(tx_q) < (MAX_SKB_FRAGS + 3))
+ netif_stop_queue(adpt->netdev);
+
+ /* update produce idx */
+ prod_idx = (tx_q->tpd.produce_idx << tx_q->produce_shift) &
+ tx_q->produce_mask;
+ emac_reg_update32(adpt->base + tx_q->produce_reg,
+ tx_q->produce_mask, prod_idx);
+
+ return NETDEV_TX_OK;
+}