1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com) 4 * 5 * Registers and bits definitions of ARC EMAC 6 */ 7 8 #ifndef ARC_EMAC_H 9 #define ARC_EMAC_H 10 11 #include <linux/device.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/netdevice.h> 14 #include <linux/phy.h> 15 #include <linux/clk.h> 16 17 /* STATUS and ENABLE Register bit masks */ 18 #define TXINT_MASK (1 << 0) /* Transmit interrupt */ 19 #define RXINT_MASK (1 << 1) /* Receive interrupt */ 20 #define ERR_MASK (1 << 2) /* Error interrupt */ 21 #define TXCH_MASK (1 << 3) /* Transmit chaining error interrupt */ 22 #define MSER_MASK (1 << 4) /* Missed packet counter error */ 23 #define RXCR_MASK (1 << 8) /* RXCRCERR counter rolled over */ 24 #define RXFR_MASK (1 << 9) /* RXFRAMEERR counter rolled over */ 25 #define RXFL_MASK (1 << 10) /* RXOFLOWERR counter rolled over */ 26 #define MDIO_MASK (1 << 12) /* MDIO complete interrupt */ 27 #define TXPL_MASK (1 << 31) /* Force polling of BD by EMAC */ 28 29 /* CONTROL Register bit masks */ 30 #define EN_MASK (1 << 0) /* VMAC enable */ 31 #define TXRN_MASK (1 << 3) /* TX enable */ 32 #define RXRN_MASK (1 << 4) /* RX enable */ 33 #define DSBC_MASK (1 << 8) /* Disable receive broadcast */ 34 #define ENFL_MASK (1 << 10) /* Enable Full-duplex */ 35 #define PROM_MASK (1 << 11) /* Promiscuous mode */ 36 37 /* Buffer descriptor INFO bit masks */ 38 #define OWN_MASK (1 << 31) /* 0-CPU or 1-EMAC owns buffer */ 39 #define FIRST_MASK (1 << 16) /* First buffer in chain */ 40 #define LAST_MASK (1 << 17) /* Last buffer in chain */ 41 #define LEN_MASK 0x000007FF /* last 11 bits */ 42 #define CRLS (1 << 21) 43 #define DEFR (1 << 22) 44 #define DROP (1 << 23) 45 #define RTRY (1 << 24) 46 #define LTCL (1 << 28) 47 #define UFLO (1 << 29) 48 49 #define FOR_EMAC OWN_MASK 50 #define FOR_CPU 0 51 52 /* ARC EMAC register set combines entries for MAC and MDIO */ 53 enum { 54 R_ID = 0, 55 R_STATUS, 56 R_ENABLE, 57 R_CTRL, 58 R_POLLRATE, 59 R_RXERR, 60 R_MISS, 61 R_TX_RING, 62 R_RX_RING, 63 R_ADDRL, 64 R_ADDRH, 65 R_LAFL, 66 R_LAFH, 67 R_MDIO, 68 }; 69 70 #define TX_TIMEOUT (400 * HZ / 1000) /* Transmission timeout */ 71 72 #define ARC_EMAC_NAPI_WEIGHT 40 /* Workload for NAPI */ 73 74 #define EMAC_BUFFER_SIZE 1536 /* EMAC buffer size */ 75 76 /** 77 * struct arc_emac_bd - EMAC buffer descriptor (BD). 78 * 79 * @info: Contains status information on the buffer itself. 80 * @data: 32-bit byte addressable pointer to the packet data. 81 */ 82 struct arc_emac_bd { 83 __le32 info; 84 dma_addr_t data; 85 }; 86 87 /* Number of Rx/Tx BD's */ 88 #define RX_BD_NUM 128 89 #define TX_BD_NUM 128 90 91 #define RX_RING_SZ (RX_BD_NUM * sizeof(struct arc_emac_bd)) 92 #define TX_RING_SZ (TX_BD_NUM * sizeof(struct arc_emac_bd)) 93 94 /** 95 * struct buffer_state - Stores Rx/Tx buffer state. 96 * @sk_buff: Pointer to socket buffer. 97 * @addr: Start address of DMA-mapped memory region. 98 * @len: Length of DMA-mapped memory region. 99 */ 100 struct buffer_state { 101 struct sk_buff *skb; 102 DEFINE_DMA_UNMAP_ADDR(addr); 103 DEFINE_DMA_UNMAP_LEN(len); 104 }; 105 106 struct arc_emac_mdio_bus_data { 107 struct gpio_desc *reset_gpio; 108 int msec; 109 }; 110 111 /** 112 * struct arc_emac_priv - Storage of EMAC's private information. 113 * @dev: Pointer to the current device. 114 * @phy_dev: Pointer to attached PHY device. 115 * @bus: Pointer to the current MII bus. 116 * @regs: Base address of EMAC memory-mapped control registers. 117 * @napi: Structure for NAPI. 118 * @rxbd: Pointer to Rx BD ring. 119 * @txbd: Pointer to Tx BD ring. 120 * @rxbd_dma: DMA handle for Rx BD ring. 121 * @txbd_dma: DMA handle for Tx BD ring. 122 * @rx_buff: Storage for Rx buffers states. 123 * @tx_buff: Storage for Tx buffers states. 124 * @txbd_curr: Index of Tx BD to use on the next "ndo_start_xmit". 125 * @txbd_dirty: Index of Tx BD to free on the next Tx interrupt. 126 * @last_rx_bd: Index of the last Rx BD we've got from EMAC. 127 * @link: PHY's last seen link state. 128 * @duplex: PHY's last set duplex mode. 129 * @speed: PHY's last set speed. 130 */ 131 struct arc_emac_priv { 132 const char *drv_name; 133 void (*set_mac_speed)(void *priv, unsigned int speed); 134 135 /* Devices */ 136 struct device *dev; 137 struct mii_bus *bus; 138 struct arc_emac_mdio_bus_data bus_data; 139 140 void __iomem *regs; 141 struct clk *clk; 142 143 struct napi_struct napi; 144 145 struct arc_emac_bd *rxbd; 146 struct arc_emac_bd *txbd; 147 148 dma_addr_t rxbd_dma; 149 dma_addr_t txbd_dma; 150 151 struct buffer_state rx_buff[RX_BD_NUM]; 152 struct buffer_state tx_buff[TX_BD_NUM]; 153 unsigned int txbd_curr; 154 unsigned int txbd_dirty; 155 156 unsigned int last_rx_bd; 157 158 unsigned int link; 159 unsigned int duplex; 160 unsigned int speed; 161 162 unsigned int rx_missed_errors; 163 }; 164 165 /** 166 * arc_reg_set - Sets EMAC register with provided value. 167 * @priv: Pointer to ARC EMAC private data structure. 168 * @reg: Register offset from base address. 169 * @value: Value to set in register. 170 */ 171 static inline void arc_reg_set(struct arc_emac_priv *priv, int reg, int value) 172 { 173 iowrite32(value, priv->regs + reg * sizeof(int)); 174 } 175 176 /** 177 * arc_reg_get - Gets value of specified EMAC register. 178 * @priv: Pointer to ARC EMAC private data structure. 179 * @reg: Register offset from base address. 180 * 181 * returns: Value of requested register. 182 */ 183 static inline unsigned int arc_reg_get(struct arc_emac_priv *priv, int reg) 184 { 185 return ioread32(priv->regs + reg * sizeof(int)); 186 } 187 188 /** 189 * arc_reg_or - Applies mask to specified EMAC register - ("reg" | "mask"). 190 * @priv: Pointer to ARC EMAC private data structure. 191 * @reg: Register offset from base address. 192 * @mask: Mask to apply to specified register. 193 * 194 * This function reads initial register value, then applies provided mask 195 * to it and then writes register back. 196 */ 197 static inline void arc_reg_or(struct arc_emac_priv *priv, int reg, int mask) 198 { 199 unsigned int value = arc_reg_get(priv, reg); 200 201 arc_reg_set(priv, reg, value | mask); 202 } 203 204 /** 205 * arc_reg_clr - Applies mask to specified EMAC register - ("reg" & ~"mask"). 206 * @priv: Pointer to ARC EMAC private data structure. 207 * @reg: Register offset from base address. 208 * @mask: Mask to apply to specified register. 209 * 210 * This function reads initial register value, then applies provided mask 211 * to it and then writes register back. 212 */ 213 static inline void arc_reg_clr(struct arc_emac_priv *priv, int reg, int mask) 214 { 215 unsigned int value = arc_reg_get(priv, reg); 216 217 arc_reg_set(priv, reg, value & ~mask); 218 } 219 220 int arc_mdio_probe(struct arc_emac_priv *priv); 221 int arc_mdio_remove(struct arc_emac_priv *priv); 222 int arc_emac_probe(struct net_device *ndev, int interface); 223 void arc_emac_remove(struct net_device *ndev); 224 225 #endif /* ARC_EMAC_H */ 226