drivers/net/ethernet/ibm/emac/mal.h

   1 /*
   2  * drivers/net/ethernet/ibm/emac/mal.h
   3  *
   4  * Memory Access Layer (MAL) support
   5  *
   6  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
   7  *                <benh@kernel.crashing.org>
   8  *
   9  * Based on the arch/ppc version of the driver:
  10  *
  11  * Copyright (c) 2004, 2005 Zultys Technologies.
  12  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  13  *
  14  * Based on original work by
  15  *      Armin Kuster <akuster@mvista.com>
  16  *      Copyright 2002 MontaVista Softare Inc.
  17  *
  18  * This program is free software; you can redistribute  it and/or modify it
  19  * under  the terms of  the GNU General  Public License as published by the
  20  * Free Software Foundation;  either version 2 of the  License, or (at your
  21  * option) any later version.
  22  *
  23  */
  24 #ifndef __IBM_NEWEMAC_MAL_H
  25 #define __IBM_NEWEMAC_MAL_H
  26
  27 /*
  28  * There are some variations on the MAL, we express them in this driver as
  29  * MAL Version 1 and 2 though that doesn't match any IBM terminology.
  30  *
  31  * We call MAL 1 the version in 405GP, 405GPR, 405EP, 440EP, 440GR and
  32  * NP405H.
  33  *
  34  * We call MAL 2 the version in 440GP, 440GX, 440SP, 440SPE and Axon
  35  *
  36  * The driver expects a "version" property in the emac node containing
  37  * a number 1 or 2. New device-trees for EMAC capable platforms are thus
  38  * required to include that when porting to arch/powerpc.
  39  */
  40
  41 /* MALx DCR registers */
  42 #define MAL_CFG                 0x00
  43 #define   MAL_CFG_SR            0x80000000
  44 #define   MAL_CFG_PLBB          0x00004000
  45 #define   MAL_CFG_OPBBL         0x00000080
  46 #define   MAL_CFG_EOPIE         0x00000004
  47 #define   MAL_CFG_LEA           0x00000002
  48 #define   MAL_CFG_SD            0x00000001
  49
  50 /* MAL V1 CFG bits */
  51 #define   MAL1_CFG_PLBP_MASK    0x00c00000
  52 #define   MAL1_CFG_PLBP_10      0x00800000
  53 #define   MAL1_CFG_GA           0x00200000
  54 #define   MAL1_CFG_OA           0x00100000
  55 #define   MAL1_CFG_PLBLE        0x00080000
  56 #define   MAL1_CFG_PLBT_MASK    0x00078000
  57 #define   MAL1_CFG_DEFAULT      (MAL1_CFG_PLBP_10 | MAL1_CFG_PLBT_MASK)
  58
  59 /* MAL V2 CFG bits */
  60 #define   MAL2_CFG_RPP_MASK     0x00c00000
  61 #define   MAL2_CFG_RPP_10       0x00800000
  62 #define   MAL2_CFG_RMBS_MASK    0x00300000
  63 #define   MAL2_CFG_WPP_MASK     0x000c0000
  64 #define   MAL2_CFG_WPP_10       0x00080000
  65 #define   MAL2_CFG_WMBS_MASK    0x00030000
  66 #define   MAL2_CFG_PLBLE        0x00008000
  67 #define   MAL2_CFG_DEFAULT      (MAL2_CFG_RMBS_MASK | MAL2_CFG_WMBS_MASK | \
  68                                  MAL2_CFG_RPP_10 | MAL2_CFG_WPP_10)
  69
  70 #define MAL_ESR                 0x01
  71 #define   MAL_ESR_EVB           0x80000000
  72 #define   MAL_ESR_CIDT          0x40000000
  73 #define   MAL_ESR_CID_MASK      0x3e000000
  74 #define   MAL_ESR_CID_SHIFT     25
  75 #define   MAL_ESR_DE            0x00100000
  76 #define   MAL_ESR_OTE           0x00040000
  77 #define   MAL_ESR_OSE           0x00020000
  78 #define   MAL_ESR_PEIN          0x00010000
  79 #define   MAL_ESR_DEI           0x00000010
  80 #define   MAL_ESR_OTEI          0x00000004
  81 #define   MAL_ESR_OSEI          0x00000002
  82 #define   MAL_ESR_PBEI          0x00000001
  83
  84 /* MAL V1 ESR bits */
  85 #define   MAL1_ESR_ONE          0x00080000
  86 #define   MAL1_ESR_ONEI         0x00000008
  87
  88 /* MAL V2 ESR bits */
  89 #define   MAL2_ESR_PTE          0x00800000
  90 #define   MAL2_ESR_PRE          0x00400000
  91 #define   MAL2_ESR_PWE          0x00200000
  92 #define   MAL2_ESR_PTEI         0x00000080
  93 #define   MAL2_ESR_PREI         0x00000040
  94 #define   MAL2_ESR_PWEI         0x00000020
  95
  96
  97 #define MAL_IER                 0x02
  98 /* MAL IER bits */
  99 #define   MAL_IER_DE            0x00000010
 100 #define   MAL_IER_OTE           0x00000004
 101 #define   MAL_IER_OE            0x00000002
 102 #define   MAL_IER_PE            0x00000001
 103
 104 /* PLB read/write/timeout errors */
 105 #define   MAL_IER_PTE           0x00000080
 106 #define   MAL_IER_PRE           0x00000040
 107 #define   MAL_IER_PWE           0x00000020
 108
 109 #define   MAL_IER_SOC_EVENTS    (MAL_IER_PTE | MAL_IER_PRE | MAL_IER_PWE)
 110 #define   MAL_IER_EVENTS        (MAL_IER_SOC_EVENTS | MAL_IER_DE | \
 111                                  MAL_IER_OTE | MAL_IER_OE | MAL_IER_PE)
 112
 113 #define MAL_TXCASR              0x04
 114 #define MAL_TXCARR              0x05
 115 #define MAL_TXEOBISR            0x06
 116 #define MAL_TXDEIR              0x07
 117 #define MAL_RXCASR              0x10
 118 #define MAL_RXCARR              0x11
 119 #define MAL_RXEOBISR            0x12
 120 #define MAL_RXDEIR              0x13
 121 #define MAL_TXCTPR(n)           ((n) + 0x20)
 122 #define MAL_RXCTPR(n)           ((n) + 0x40)
 123 #define MAL_RCBS(n)             ((n) + 0x60)
 124
 125 /* In reality MAL can handle TX buffers up to 4095 bytes long,
 126  * but this isn't a good round number :)                 --ebs
 127  */
 128 #define MAL_MAX_TX_SIZE         4080
 129 #define MAL_MAX_RX_SIZE         4080
 130
 131 static inline int mal_rx_size(int len)
 132 {
 133         len = (len + 0xf) & ~0xf;
 134         return len > MAL_MAX_RX_SIZE ? MAL_MAX_RX_SIZE : len;
 135 }
 136
 137 static inline int mal_tx_chunks(int len)
 138 {
 139         return (len + MAL_MAX_TX_SIZE - 1) / MAL_MAX_TX_SIZE;
 140 }
 141
 142 #define MAL_CHAN_MASK(n)        (0x80000000 >> (n))
 143
 144 /* MAL Buffer Descriptor structure */
 145 struct mal_descriptor {
 146         u16 ctrl;               /* MAL / Commac status control bits */
 147         u16 data_len;           /* Max length is 4K-1 (12 bits)     */
 148         u32 data_ptr;           /* pointer to actual data buffer    */
 149 };
 150
 151 /* the following defines are for the MadMAL status and control registers. */
 152 /* MADMAL transmit and receive status/control bits  */
 153 #define MAL_RX_CTRL_EMPTY       0x8000
 154 #define MAL_RX_CTRL_WRAP        0x4000
 155 #define MAL_RX_CTRL_CM          0x2000
 156 #define MAL_RX_CTRL_LAST        0x1000
 157 #define MAL_RX_CTRL_FIRST       0x0800
 158 #define MAL_RX_CTRL_INTR        0x0400
 159 #define MAL_RX_CTRL_SINGLE      (MAL_RX_CTRL_LAST | MAL_RX_CTRL_FIRST)
 160 #define MAL_IS_SINGLE_RX(ctrl)  (((ctrl) & MAL_RX_CTRL_SINGLE) == MAL_RX_CTRL_SINGLE)
 161
 162 #define MAL_TX_CTRL_READY       0x8000
 163 #define MAL_TX_CTRL_WRAP        0x4000
 164 #define MAL_TX_CTRL_CM          0x2000
 165 #define MAL_TX_CTRL_LAST        0x1000
 166 #define MAL_TX_CTRL_INTR        0x0400
 167
 168 struct mal_commac_ops {
 169         void    (*poll_tx) (void *dev);
 170         int     (*poll_rx) (void *dev, int budget);
 171         int     (*peek_rx) (void *dev);
 172         void    (*rxde) (void *dev);
 173 };
 174
 175 struct mal_commac {
 176         struct mal_commac_ops   *ops;
 177         void                    *dev;
 178         struct list_head        poll_list;
 179         long                    flags;
 180 #define MAL_COMMAC_RX_STOPPED           0
 181 #define MAL_COMMAC_POLL_DISABLED        1
 182         u32                     tx_chan_mask;
 183         u32                     rx_chan_mask;
 184         struct list_head        list;
 185 };
 186
 187 struct mal_instance {
 188         int                     version;
 189         dcr_host_t              dcr_host;
 190
 191         int                     num_tx_chans;   /* Number of TX channels */
 192         int                     num_rx_chans;   /* Number of RX channels */
 193         int                     txeob_irq;      /* TX End Of Buffer IRQ  */
 194         int                     rxeob_irq;      /* RX End Of Buffer IRQ  */
 195         int                     txde_irq;       /* TX Descriptor Error IRQ */
 196         int                     rxde_irq;       /* RX Descriptor Error IRQ */
 197         int                     serr_irq;       /* MAL System Error IRQ    */
 198
 199         struct list_head        poll_list;
 200         struct napi_struct      napi;
 201
 202         struct list_head        list;
 203         u32                     tx_chan_mask;
 204         u32                     rx_chan_mask;
 205
 206         dma_addr_t              bd_dma;
 207         struct mal_descriptor   *bd_virt;
 208
 209         struct platform_device  *ofdev;
 210         int                     index;
 211         spinlock_t              lock;
 212
 213         struct net_device       dummy_dev;
 214
 215         unsigned int features;
 216 };
 217
 218 static inline u32 get_mal_dcrn(struct mal_instance *mal, int reg)
 219 {
 220         return dcr_read(mal->dcr_host, reg);
 221 }
 222
 223 static inline void set_mal_dcrn(struct mal_instance *mal, int reg, u32 val)
 224 {
 225         dcr_write(mal->dcr_host, reg, val);
 226 }
 227
 228 /* Features of various MAL implementations */
 229
 230 /* Set if you have interrupt coalescing and you have to clear the SDR
 231  * register for TXEOB and RXEOB interrupts to work
 232  */
 233 #define MAL_FTR_CLEAR_ICINTSTAT 0x00000001
 234
 235 /* Set if your MAL has SERR, TXDE, and RXDE OR'd into a single UIC
 236  * interrupt
 237  */
 238 #define MAL_FTR_COMMON_ERR_INT  0x00000002
 239
 240 enum {
 241         MAL_FTRS_ALWAYS = 0,
 242
 243         MAL_FTRS_POSSIBLE =
 244 #ifdef CONFIG_IBM_EMAC_MAL_CLR_ICINTSTAT
 245                 MAL_FTR_CLEAR_ICINTSTAT |
 246 #endif
 247 #ifdef CONFIG_IBM_EMAC_MAL_COMMON_ERR
 248                 MAL_FTR_COMMON_ERR_INT |
 249 #endif
 250                 0,
 251 };
 252
 253 static inline int mal_has_feature(struct mal_instance *dev,
 254                 unsigned long feature)
 255 {
 256         return (MAL_FTRS_ALWAYS & feature) ||
 257                 (MAL_FTRS_POSSIBLE & dev->features & feature);
 258 }
 259
 260 /* Register MAL devices */
 261 int mal_init(void);
 262 void mal_exit(void);
 263
 264 int mal_register_commac(struct mal_instance *mal,
 265                         struct mal_commac *commac);
 266 void mal_unregister_commac(struct mal_instance *mal,
 267                            struct mal_commac *commac);
 268 int mal_set_rcbs(struct mal_instance *mal, int channel, unsigned long size);
 269
 270 /* Returns BD ring offset for a particular channel
 271    (in 'struct mal_descriptor' elements)
 272 */
 273 int mal_tx_bd_offset(struct mal_instance *mal, int channel);
 274 int mal_rx_bd_offset(struct mal_instance *mal, int channel);
 275
 276 void mal_enable_tx_channel(struct mal_instance *mal, int channel);
 277 void mal_disable_tx_channel(struct mal_instance *mal, int channel);
 278 void mal_enable_rx_channel(struct mal_instance *mal, int channel);
 279 void mal_disable_rx_channel(struct mal_instance *mal, int channel);
 280
 281 void mal_poll_disable(struct mal_instance *mal, struct mal_commac *commac);
 282 void mal_poll_enable(struct mal_instance *mal, struct mal_commac *commac);
 283
 284 /* Add/remove EMAC to/from MAL polling list */
 285 void mal_poll_add(struct mal_instance *mal, struct mal_commac *commac);
 286 void mal_poll_del(struct mal_instance *mal, struct mal_commac *commac);
 287
 288 /* Ethtool MAL registers */
 289 struct mal_regs {
 290         u32 tx_count;
 291         u32 rx_count;
 292
 293         u32 cfg;
 294         u32 esr;
 295         u32 ier;
 296         u32 tx_casr;
 297         u32 tx_carr;
 298         u32 tx_eobisr;
 299         u32 tx_deir;
 300         u32 rx_casr;
 301         u32 rx_carr;
 302         u32 rx_eobisr;
 303         u32 rx_deir;
 304         u32 tx_ctpr[32];
 305         u32 rx_ctpr[32];
 306         u32 rcbs[32];
 307 };
 308
 309 int mal_get_regs_len(struct mal_instance *mal);
 310 void *mal_dump_regs(struct mal_instance *mal, void *buf);
 311
 312 #endif /* __IBM_NEWEMAC_MAL_H */