This patch adds DMA descriptor setup and interrupt enable/disable functions.
Signed-off-by: Iyappan Subramanian <isubraman...@apm.com> Signed-off-by: Keyur Chudgar <kchud...@apm.com> --- drivers/net/ethernet/apm/xgene-v2/main.h | 88 ++++++++++++++++++++++++++++++++ drivers/net/ethernet/apm/xgene-v2/ring.c | 73 ++++++++++++++++++++++++++ drivers/net/ethernet/apm/xgene-v2/ring.h | 77 ++++++++++++++++++++++++++++ 3 files changed, 238 insertions(+) create mode 100644 drivers/net/ethernet/apm/xgene-v2/main.h create mode 100644 drivers/net/ethernet/apm/xgene-v2/ring.c create mode 100644 drivers/net/ethernet/apm/xgene-v2/ring.h diff --git a/drivers/net/ethernet/apm/xgene-v2/main.h b/drivers/net/ethernet/apm/xgene-v2/main.h new file mode 100644 index 0000000..c8a40af --- /dev/null +++ b/drivers/net/ethernet/apm/xgene-v2/main.h @@ -0,0 +1,88 @@ +/* + * Applied Micro X-Gene SoC Ethernet v2 Driver + * + * Copyright (c) 2017, Applied Micro Circuits Corporation + * Author(s): Iyappan Subramanian <isubraman...@apm.com> + * Keyur Chudgar <kchud...@apm.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __XGENE_ENET_V2_MAIN_H__ +#define __XGENE_ENET_V2_MAIN_H__ + +#include <linux/acpi.h> +#include <linux/clk.h> +#include <linux/efi.h> +#include <linux/if_vlan.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/of_net.h> +#include <linux/of_mdio.h> +#include <linux/prefetch.h> +#include <linux/phy.h> +#include <net/ip.h> +#include "mac.h" +#include "enet.h" +#include "ring.h" + +#define XGENE_ENET_V2_VERSION "v1.0" +#define XGENE_ENET_STD_MTU 1536 +#define XGENE_ENET_MIN_FRAME 60 +#define IRQ_ID_SIZE 16 + +struct xge_resource { + void __iomem *base_addr; + int phy_mode; + u32 irq; +}; + +struct xge_stats { + u64 tx_packets; + u64 tx_bytes; + u64 rx_packets; + u64 rx_bytes; +}; + +/* software context of a descriptor ring */ +struct xge_desc_ring { + struct net_device *ndev; + dma_addr_t dma_addr; + u8 head; + u8 tail; + union { + void *desc_addr; + struct xge_raw_desc *raw_desc; + }; + struct sk_buff *(*skbs); + void *(*pkt_bufs); +}; + +/* ethernet private data */ +struct xge_pdata { + struct xge_resource resources; + struct xge_desc_ring *tx_ring; + struct xge_desc_ring *rx_ring; + struct platform_device *pdev; + char irq_name[IRQ_ID_SIZE]; + struct net_device *ndev; + struct napi_struct napi; + struct xge_stats stats; + int phy_speed; + u8 nbufs; +}; + +#endif /* __XGENE_ENET_V2_MAIN_H__ */ diff --git a/drivers/net/ethernet/apm/xgene-v2/ring.c b/drivers/net/ethernet/apm/xgene-v2/ring.c new file mode 100644 index 0000000..3289bf3 --- /dev/null +++ b/drivers/net/ethernet/apm/xgene-v2/ring.c @@ -0,0 +1,73 @@ +/* + * Applied Micro X-Gene SoC Ethernet v2 Driver + * + * Copyright (c) 2017, Applied Micro Circuits Corporation + * Author(s): Iyappan Subramanian <isubraman...@apm.com> + * Keyur Chudgar <kchud...@apm.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "main.h" + +/* create circular linked list of descriptors */ +void xge_setup_desc(struct xge_desc_ring *ring) +{ + struct xge_raw_desc *raw_desc; + dma_addr_t dma_h, next_dma; + u16 offset; + int i; + + for (i = 0; i < XGENE_ENET_NUM_DESC; i++) { + raw_desc = &ring->raw_desc[i]; + + offset = (i + 1) & (XGENE_ENET_NUM_DESC - 1); + next_dma = ring->dma_addr + (offset * XGENE_ENET_DESC_SIZE); + + raw_desc->m0 = cpu_to_le64(SET_BITS(E, 1) | + SET_BITS(PKT_SIZE, 0)); + dma_h = next_dma >> NEXT_DESC_ADDRL_LEN; + raw_desc->m1 = cpu_to_le64(SET_BITS(NEXT_DESC_ADDRL, next_dma) | + SET_BITS(NEXT_DESC_ADDRL, dma_h)); + } +} + +void xge_update_tx_desc_addr(struct xge_pdata *pdata) +{ + dma_addr_t dma_addr = pdata->tx_ring->dma_addr; + + xge_wr_csr(pdata, DMATXDESCL, dma_addr); + xge_wr_csr(pdata, DMATXDESCH, (dma_addr >> NEXT_DESC_ADDRL_LEN)); +} + +void xge_update_rx_desc_addr(struct xge_pdata *pdata) +{ + dma_addr_t dma_addr = pdata->rx_ring->dma_addr; + + xge_wr_csr(pdata, DMARXDESCL, dma_addr); + xge_wr_csr(pdata, DMARXDESCH, (dma_addr >> NEXT_DESC_ADDRL_LEN)); +} + +void xge_intr_enable(struct xge_pdata *pdata) +{ + u32 data; + + data = RX_PKT_RCVD | TX_PKT_SENT; + xge_wr_csr(pdata, DMAINTRMASK, data); +} + +void xge_intr_disable(struct xge_pdata *pdata) +{ + xge_wr_csr(pdata, DMAINTRMASK, 0); +} diff --git a/drivers/net/ethernet/apm/xgene-v2/ring.h b/drivers/net/ethernet/apm/xgene-v2/ring.h new file mode 100644 index 0000000..f2711f4 --- /dev/null +++ b/drivers/net/ethernet/apm/xgene-v2/ring.h @@ -0,0 +1,77 @@ +/* + * Applied Micro X-Gene SoC Ethernet v2 Driver + * + * Copyright (c) 2017, Applied Micro Circuits Corporation + * Author(s): Iyappan Subramanian <isubraman...@apm.com> + * Keyur Chudgar <kchud...@apm.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __XGENE_ENET_V2_RING_H__ +#define __XGENE_ENET_V2_RING_H__ + +struct xge_desc_ring; + +#define XGENE_ENET_DESC_SIZE 64 +#define XGENE_ENET_NUM_DESC 256 +#define NUM_BUFS 8 + +#define E_POS 63 +#define E_LEN 1 +#define PKT_ADDRL_POS 0 +#define PKT_ADDRL_LEN 32 +#define PKT_ADDRH_POS 32 +#define PKT_ADDRH_LEN 10 +#define PKT_SIZE_POS 32 +#define PKT_SIZE_LEN 12 +#define NEXT_DESC_ADDRL_POS 0 +#define NEXT_DESC_ADDRL_LEN 32 +#define NEXT_DESC_ADDRH_POS 48 +#define NEXT_DESC_ADDRH_LEN 10 + +struct xge_raw_desc { + __le64 m0; + __le64 m1; + __le64 m2; + __le64 m3; + __le64 m4; + __le64 m5; + __le64 m6; + __le64 m7; +}; + +static inline u64 xge_set_desc_bits(int pos, int len, u64 val) +{ + return (val & ((1ULL << len) - 1)) << pos; +} + +static inline u64 xge_get_desc_bits(int pos, int len, u64 src) +{ + return (src >> pos) & ((1ULL << len) - 1); +} + +#define SET_BITS(field, val) \ + xge_set_desc_bits(field ## _POS, field ## _LEN, val) + +#define GET_BITS(field, src) \ + xge_get_desc_bits(field ## _POS, field ## _LEN, src) + +void xge_setup_desc(struct xge_desc_ring *ring); +void xge_update_tx_desc_addr(struct xge_pdata *pdata); +void xge_update_rx_desc_addr(struct xge_pdata *pdata); +void xge_intr_enable(struct xge_pdata *pdata); +void xge_intr_disable(struct xge_pdata *pdata); + +#endif /* __XGENE_ENET_V2_RING_H__ */ -- 1.9.1
