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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 | // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) /* Copyright (C) 2015-2018 Netronome Systems, Inc. */ /* * nfp_cpplib.c * Library of functions to access the NFP's CPP bus * Authors: Jakub Kicinski <jakub.kicinski@netronome.com> * Jason McMullan <jason.mcmullan@netronome.com> * Rolf Neugebauer <rolf.neugebauer@netronome.com> */ #include <asm/unaligned.h> #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/sched.h> #include "nfp_cpp.h" #include "nfp6000/nfp6000.h" #include "nfp6000/nfp_xpb.h" /* NFP6000 PL */ #define NFP_PL_DEVICE_PART_NFP6000 0x6200 #define NFP_PL_DEVICE_ID 0x00000004 #define NFP_PL_DEVICE_ID_MASK GENMASK(7, 0) #define NFP_PL_DEVICE_PART_MASK GENMASK(31, 16) #define NFP_PL_DEVICE_MODEL_MASK (NFP_PL_DEVICE_PART_MASK | \ NFP_PL_DEVICE_ID_MASK) /** * nfp_cpp_readl() - Read a u32 word from a CPP location * @cpp: CPP device handle * @cpp_id: CPP ID for operation * @address: Address for operation * @value: Pointer to read buffer * * Return: 0 on success, or -ERRNO */ int nfp_cpp_readl(struct nfp_cpp *cpp, u32 cpp_id, unsigned long long address, u32 *value) { u8 tmp[4]; int n; n = nfp_cpp_read(cpp, cpp_id, address, tmp, sizeof(tmp)); if (n != sizeof(tmp)) return n < 0 ? n : -EIO; *value = get_unaligned_le32(tmp); return 0; } /** * nfp_cpp_writel() - Write a u32 word to a CPP location * @cpp: CPP device handle * @cpp_id: CPP ID for operation * @address: Address for operation * @value: Value to write * * Return: 0 on success, or -ERRNO */ int nfp_cpp_writel(struct nfp_cpp *cpp, u32 cpp_id, unsigned long long address, u32 value) { u8 tmp[4]; int n; put_unaligned_le32(value, tmp); n = nfp_cpp_write(cpp, cpp_id, address, tmp, sizeof(tmp)); return n == sizeof(tmp) ? 0 : n < 0 ? n : -EIO; } /** * nfp_cpp_readq() - Read a u64 word from a CPP location * @cpp: CPP device handle * @cpp_id: CPP ID for operation * @address: Address for operation * @value: Pointer to read buffer * * Return: 0 on success, or -ERRNO */ int nfp_cpp_readq(struct nfp_cpp *cpp, u32 cpp_id, unsigned long long address, u64 *value) { u8 tmp[8]; int n; n = nfp_cpp_read(cpp, cpp_id, address, tmp, sizeof(tmp)); if (n != sizeof(tmp)) return n < 0 ? n : -EIO; *value = get_unaligned_le64(tmp); return 0; } /** * nfp_cpp_writeq() - Write a u64 word to a CPP location * @cpp: CPP device handle * @cpp_id: CPP ID for operation * @address: Address for operation * @value: Value to write * * Return: 0 on success, or -ERRNO */ int nfp_cpp_writeq(struct nfp_cpp *cpp, u32 cpp_id, unsigned long long address, u64 value) { u8 tmp[8]; int n; put_unaligned_le64(value, tmp); n = nfp_cpp_write(cpp, cpp_id, address, tmp, sizeof(tmp)); return n == sizeof(tmp) ? 0 : n < 0 ? n : -EIO; } /* NOTE: This code should not use nfp_xpb_* functions, * as those are model-specific */ int nfp_cpp_model_autodetect(struct nfp_cpp *cpp, u32 *model) { u32 reg; int err; err = nfp_xpb_readl(cpp, NFP_XPB_DEVICE(1, 1, 16) + NFP_PL_DEVICE_ID, ®); if (err < 0) return err; *model = reg & NFP_PL_DEVICE_MODEL_MASK; /* Disambiguate the NFP4000/NFP5000/NFP6000 chips */ if (FIELD_GET(NFP_PL_DEVICE_PART_MASK, reg) == NFP_PL_DEVICE_PART_NFP6000) { if (*model & NFP_PL_DEVICE_ID_MASK) *model -= 0x10; } return 0; } static u8 nfp_bytemask(int width, u64 addr) { if (width == 8) return 0xff; else if (width == 4) return 0x0f << (addr & 4); else if (width == 2) return 0x03 << (addr & 6); else if (width == 1) return 0x01 << (addr & 7); else return 0; } int nfp_cpp_explicit_read(struct nfp_cpp *cpp, u32 cpp_id, u64 addr, void *buff, size_t len, int width_read) { struct nfp_cpp_explicit *expl; char *tmp = buff; int err, i, incr; u8 byte_mask; if (len & (width_read - 1)) return -EINVAL; expl = nfp_cpp_explicit_acquire(cpp); if (!expl) return -EBUSY; incr = min_t(int, 16 * width_read, 128); incr = min_t(int, incr, len); /* Translate a NFP_CPP_ACTION_RW to action 0 */ if (NFP_CPP_ID_ACTION_of(cpp_id) == NFP_CPP_ACTION_RW) cpp_id = NFP_CPP_ID(NFP_CPP_ID_TARGET_of(cpp_id), 0, NFP_CPP_ID_TOKEN_of(cpp_id)); byte_mask = nfp_bytemask(width_read, addr); nfp_cpp_explicit_set_target(expl, cpp_id, incr / width_read - 1, byte_mask); nfp_cpp_explicit_set_posted(expl, 1, 0, NFP_SIGNAL_PUSH, 0, NFP_SIGNAL_NONE); for (i = 0; i < len; i += incr, addr += incr, tmp += incr) { if (i + incr > len) { incr = len - i; nfp_cpp_explicit_set_target(expl, cpp_id, incr / width_read - 1, 0xff); } err = nfp_cpp_explicit_do(expl, addr); if (err < 0) goto exit_release; err = nfp_cpp_explicit_get(expl, tmp, incr); if (err < 0) goto exit_release; } err = len; exit_release: nfp_cpp_explicit_release(expl); return err; } int nfp_cpp_explicit_write(struct nfp_cpp *cpp, u32 cpp_id, u64 addr, const void *buff, size_t len, int width_write) { struct nfp_cpp_explicit *expl; const char *tmp = buff; int err, i, incr; u8 byte_mask; if (len & (width_write - 1)) return -EINVAL; expl = nfp_cpp_explicit_acquire(cpp); if (!expl) return -EBUSY; incr = min_t(int, 16 * width_write, 128); incr = min_t(int, incr, len); /* Translate a NFP_CPP_ACTION_RW to action 1 */ if (NFP_CPP_ID_ACTION_of(cpp_id) == NFP_CPP_ACTION_RW) cpp_id = NFP_CPP_ID(NFP_CPP_ID_TARGET_of(cpp_id), 1, NFP_CPP_ID_TOKEN_of(cpp_id)); byte_mask = nfp_bytemask(width_write, addr); nfp_cpp_explicit_set_target(expl, cpp_id, incr / width_write - 1, byte_mask); nfp_cpp_explicit_set_posted(expl, 1, 0, NFP_SIGNAL_PULL, 0, NFP_SIGNAL_NONE); for (i = 0; i < len; i += incr, addr += incr, tmp += incr) { if (i + incr > len) { incr = len - i; nfp_cpp_explicit_set_target(expl, cpp_id, incr / width_write - 1, 0xff); } err = nfp_cpp_explicit_put(expl, tmp, incr); if (err < 0) goto exit_release; err = nfp_cpp_explicit_do(expl, addr); if (err < 0) goto exit_release; } err = len; exit_release: nfp_cpp_explicit_release(expl); return err; } /** * nfp_cpp_map_area() - Helper function to map an area * @cpp: NFP CPP handler * @name: Name for the area * @cpp_id: CPP ID for operation * @addr: CPP address * @size: Size of the area * @area: Area handle (output) * * Map an area of IOMEM access. To undo the effect of this function call * @nfp_cpp_area_release_free(*area). * * Return: Pointer to memory mapped area or ERR_PTR */ u8 __iomem * nfp_cpp_map_area(struct nfp_cpp *cpp, const char *name, u32 cpp_id, u64 addr, unsigned long size, struct nfp_cpp_area **area) { u8 __iomem *res; *area = nfp_cpp_area_alloc_acquire(cpp, name, cpp_id, addr, size); if (!*area) goto err_eio; res = nfp_cpp_area_iomem(*area); if (!res) goto err_release_free; return res; err_release_free: nfp_cpp_area_release_free(*area); err_eio: return (u8 __iomem *)ERR_PTR(-EIO); } |