target/linux/octeon/patches-2.6.30/016-octeon_hw_rng.patch

   1 From: David Daney <ddaney@caviumnetworks.com>
   2 Date: Thu, 20 Aug 2009 21:10:22 +0000 (-0700)
   3 Subject: MIPS: Octeon:  Add hardware RNG platform device.
   4 X-Git-Tag: linux-2.6.32-rc1~34
   5 X-Git-Url: http://www.linux-mips.org/git?p=linux.git;a=commitdiff_plain;h=c691b963;hp=a68577bc6ce2b5e422cdb7a993b1c07cc410e02a
   6
   7 MIPS: Octeon:  Add hardware RNG platform device.
   8
   9 Add a platform device for the Octeon Random Number Generator (RNG).
  10
  11 Signed-off-by: David Daney <ddaney@caviumnetworks.com>
  12 Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
  13 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  14 ---
  15
  16 Index: linux-2.6.30.8/arch/mips/cavium-octeon/setup.c
  17 ===================================================================
  18 --- linux-2.6.30.8.orig/arch/mips/cavium-octeon/setup.c 2009-09-24 17:28:02.000000000 +0200
  19 +++ linux-2.6.30.8/arch/mips/cavium-octeon/setup.c      2009-10-08 13:10:09.000000000 +0200
  20 @@ -32,6 +32,7 @@
  21  #include <asm/time.h>
  22
  23  #include <asm/octeon/octeon.h>
  24 +#include <asm/octeon/cvmx-rnm-defs.h>
  25
  26  #ifdef CONFIG_CAVIUM_DECODE_RSL
  27  extern void cvmx_interrupt_rsl_decode(void);
  28 @@ -925,3 +926,45 @@
  29         return ret;
  30  }
  31  device_initcall(octeon_cf_device_init);
  32 +
  33 +/* Octeon Random Number Generator.  */
  34 +static int __init octeon_rng_device_init(void)
  35 +{
  36 +       struct platform_device *pd;
  37 +       int ret = 0;
  38 +
  39 +       struct resource rng_resources[] = {
  40 +               {
  41 +                       .flags  = IORESOURCE_MEM,
  42 +                       .start  = XKPHYS_TO_PHYS(CVMX_RNM_CTL_STATUS),
  43 +                       .end    = XKPHYS_TO_PHYS(CVMX_RNM_CTL_STATUS) + 0xf
  44 +               }, {
  45 +                       .flags  = IORESOURCE_MEM,
  46 +                       .start  = cvmx_build_io_address(8, 0),
  47 +                       .end    = cvmx_build_io_address(8, 0) + 0x7
  48 +               }
  49 +       };
  50 +
  51 +       pd = platform_device_alloc("octeon_rng", -1);
  52 +       if (!pd) {
  53 +               ret = -ENOMEM;
  54 +               goto out;
  55 +       }
  56 +
  57 +       ret = platform_device_add_resources(pd, rng_resources,
  58 +                                           ARRAY_SIZE(rng_resources));
  59 +       if (ret)
  60 +               goto fail;
  61 +
  62 +       ret = platform_device_add(pd);
  63 +       if (ret)
  64 +               goto fail;
  65 +
  66 +       return ret;
  67 +fail:
  68 +       platform_device_put(pd);
  69 +
  70 +out:
  71 +       return ret;
  72 +}
  73 +device_initcall(octeon_rng_device_init);
  74 Index: linux-2.6.30.8/arch/mips/include/asm/octeon/cvmx-rnm-defs.h
  75 ===================================================================
  76 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  77 +++ linux-2.6.30.8/arch/mips/include/asm/octeon/cvmx-rnm-defs.h 2009-10-08 13:10:09.000000000 +0200
  78 @@ -0,0 +1,88 @@
  79 +/***********************license start***************
  80 + * Author: Cavium Networks
  81 + *
  82 + * Contact: support@caviumnetworks.com
  83 + * This file is part of the OCTEON SDK
  84 + *
  85 + * Copyright (c) 2003-2008 Cavium Networks
  86 + *
  87 + * This file is free software; you can redistribute it and/or modify
  88 + * it under the terms of the GNU General Public License, Version 2, as
  89 + * published by the Free Software Foundation.
  90 + *
  91 + * This file is distributed in the hope that it will be useful, but
  92 + * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  93 + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  94 + * NONINFRINGEMENT.  See the GNU General Public License for more
  95 + * details.
  96 + *
  97 + * You should have received a copy of the GNU General Public License
  98 + * along with this file; if not, write to the Free Software
  99 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 100 + * or visit http://www.gnu.org/licenses/.
 101 + *
 102 + * This file may also be available under a different license from Cavium.
 103 + * Contact Cavium Networks for more information
 104 + ***********************license end**************************************/
 105 +
 106 +#ifndef __CVMX_RNM_DEFS_H__
 107 +#define __CVMX_RNM_DEFS_H__
 108 +
 109 +#include <linux/types.h>
 110 +
 111 +#define CVMX_RNM_BIST_STATUS \
 112 +        CVMX_ADD_IO_SEG(0x0001180040000008ull)
 113 +#define CVMX_RNM_CTL_STATUS \
 114 +        CVMX_ADD_IO_SEG(0x0001180040000000ull)
 115 +
 116 +union cvmx_rnm_bist_status {
 117 +       uint64_t u64;
 118 +       struct cvmx_rnm_bist_status_s {
 119 +               uint64_t reserved_2_63:62;
 120 +               uint64_t rrc:1;
 121 +               uint64_t mem:1;
 122 +       } s;
 123 +       struct cvmx_rnm_bist_status_s cn30xx;
 124 +       struct cvmx_rnm_bist_status_s cn31xx;
 125 +       struct cvmx_rnm_bist_status_s cn38xx;
 126 +       struct cvmx_rnm_bist_status_s cn38xxp2;
 127 +       struct cvmx_rnm_bist_status_s cn50xx;
 128 +       struct cvmx_rnm_bist_status_s cn52xx;
 129 +       struct cvmx_rnm_bist_status_s cn52xxp1;
 130 +       struct cvmx_rnm_bist_status_s cn56xx;
 131 +       struct cvmx_rnm_bist_status_s cn56xxp1;
 132 +       struct cvmx_rnm_bist_status_s cn58xx;
 133 +       struct cvmx_rnm_bist_status_s cn58xxp1;
 134 +};
 135 +
 136 +union cvmx_rnm_ctl_status {
 137 +       uint64_t u64;
 138 +       struct cvmx_rnm_ctl_status_s {
 139 +               uint64_t reserved_9_63:55;
 140 +               uint64_t ent_sel:4;
 141 +               uint64_t exp_ent:1;
 142 +               uint64_t rng_rst:1;
 143 +               uint64_t rnm_rst:1;
 144 +               uint64_t rng_en:1;
 145 +               uint64_t ent_en:1;
 146 +       } s;
 147 +       struct cvmx_rnm_ctl_status_cn30xx {
 148 +               uint64_t reserved_4_63:60;
 149 +               uint64_t rng_rst:1;
 150 +               uint64_t rnm_rst:1;
 151 +               uint64_t rng_en:1;
 152 +               uint64_t ent_en:1;
 153 +       } cn30xx;
 154 +       struct cvmx_rnm_ctl_status_cn30xx cn31xx;
 155 +       struct cvmx_rnm_ctl_status_cn30xx cn38xx;
 156 +       struct cvmx_rnm_ctl_status_cn30xx cn38xxp2;
 157 +       struct cvmx_rnm_ctl_status_s cn50xx;
 158 +       struct cvmx_rnm_ctl_status_s cn52xx;
 159 +       struct cvmx_rnm_ctl_status_s cn52xxp1;
 160 +       struct cvmx_rnm_ctl_status_s cn56xx;
 161 +       struct cvmx_rnm_ctl_status_s cn56xxp1;
 162 +       struct cvmx_rnm_ctl_status_s cn58xx;
 163 +       struct cvmx_rnm_ctl_status_s cn58xxp1;
 164 +};
 165 +
 166 +#endif
 167 Index: linux-2.6.30.8/drivers/char/hw_random/Kconfig
 168 ===================================================================
 169 --- linux-2.6.30.8.orig/drivers/char/hw_random/Kconfig  2009-09-24 17:28:02.000000000 +0200
 170 +++ linux-2.6.30.8/drivers/char/hw_random/Kconfig       2009-10-08 13:10:09.000000000 +0200
 171 @@ -126,6 +126,19 @@
 172
 173           If unsure, say Y.
 174
 175 +config HW_RANDOM_OCTEON
 176 +       tristate "Octeon Random Number Generator support"
 177 +       depends on HW_RANDOM && CPU_CAVIUM_OCTEON
 178 +       default HW_RANDOM
 179 +       ---help---
 180 +         This driver provides kernel-side support for the Random Number
 181 +         Generator hardware found on Octeon processors.
 182 +
 183 +         To compile this driver as a module, choose M here: the
 184 +         module will be called octeon-rng.
 185 +
 186 +         If unsure, say Y.
 187 +
 188  config HW_RANDOM_PASEMI
 189         tristate "PA Semi HW Random Number Generator support"
 190         depends on HW_RANDOM && PPC_PASEMI
 191 Index: linux-2.6.30.8/drivers/char/hw_random/Makefile
 192 ===================================================================
 193 --- linux-2.6.30.8.orig/drivers/char/hw_random/Makefile 2009-09-24 17:28:02.000000000 +0200
 194 +++ linux-2.6.30.8/drivers/char/hw_random/Makefile      2009-10-08 13:10:23.000000000 +0200
 195 @@ -15,3 +15,4 @@
 196  obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
 197  obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
 198  obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
 199 +obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
 200 Index: linux-2.6.30.8/drivers/char/hw_random/octeon-rng.c
 201 ===================================================================
 202 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 203 +++ linux-2.6.30.8/drivers/char/hw_random/octeon-rng.c  2009-10-08 13:10:09.000000000 +0200
 204 @@ -0,0 +1,147 @@
 205 +/*
 206 + * Hardware Random Number Generator support for Cavium Networks
 207 + * Octeon processor family.
 208 + *
 209 + * This file is subject to the terms and conditions of the GNU General Public
 210 + * License.  See the file "COPYING" in the main directory of this archive
 211 + * for more details.
 212 + *
 213 + * Copyright (C) 2009 Cavium Networks
 214 + */
 215 +
 216 +#include <linux/module.h>
 217 +#include <linux/init.h>
 218 +#include <linux/platform_device.h>
 219 +#include <linux/device.h>
 220 +#include <linux/hw_random.h>
 221 +#include <linux/io.h>
 222 +
 223 +#include <asm/octeon/octeon.h>
 224 +#include <asm/octeon/cvmx-rnm-defs.h>
 225 +
 226 +struct octeon_rng {
 227 +       struct hwrng ops;
 228 +       void __iomem *control_status;
 229 +       void __iomem *result;
 230 +};
 231 +
 232 +static int octeon_rng_init(struct hwrng *rng)
 233 +{
 234 +       union cvmx_rnm_ctl_status ctl;
 235 +       struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
 236 +
 237 +       ctl.u64 = 0;
 238 +       ctl.s.ent_en = 1; /* Enable the entropy source.  */
 239 +       ctl.s.rng_en = 1; /* Enable the RNG hardware.  */
 240 +       cvmx_write_csr((u64)p->control_status, ctl.u64);
 241 +       return 0;
 242 +}
 243 +
 244 +static void octeon_rng_cleanup(struct hwrng *rng)
 245 +{
 246 +       union cvmx_rnm_ctl_status ctl;
 247 +       struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
 248 +
 249 +       ctl.u64 = 0;
 250 +       /* Disable everything.  */
 251 +       cvmx_write_csr((u64)p->control_status, ctl.u64);
 252 +}
 253 +
 254 +static int octeon_rng_data_read(struct hwrng *rng, u32 *data)
 255 +{
 256 +       struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
 257 +
 258 +       *data = cvmx_read64_uint32((u64)p->result);
 259 +       return sizeof(u32);
 260 +}
 261 +
 262 +static int __devinit octeon_rng_probe(struct platform_device *pdev)
 263 +{
 264 +       struct resource *res_ports;
 265 +       struct resource *res_result;
 266 +       struct octeon_rng *rng;
 267 +       int ret;
 268 +       struct hwrng ops = {
 269 +               .name = "octeon",
 270 +               .init = octeon_rng_init,
 271 +               .cleanup = octeon_rng_cleanup,
 272 +               .data_read = octeon_rng_data_read
 273 +       };
 274 +
 275 +       rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
 276 +       if (!rng)
 277 +               return -ENOMEM;
 278 +
 279 +       res_ports = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 280 +       if (!res_ports)
 281 +               goto err_ports;
 282 +
 283 +       res_result = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 284 +       if (!res_result)
 285 +               goto err_ports;
 286 +
 287 +
 288 +       rng->control_status = devm_ioremap_nocache(&pdev->dev,
 289 +                                                  res_ports->start,
 290 +                                                  sizeof(u64));
 291 +       if (!rng->control_status)
 292 +               goto err_ports;
 293 +
 294 +       rng->result = devm_ioremap_nocache(&pdev->dev,
 295 +                                          res_result->start,
 296 +                                          sizeof(u64));
 297 +       if (!rng->result)
 298 +               goto err_r;
 299 +
 300 +       rng->ops = ops;
 301 +
 302 +       dev_set_drvdata(&pdev->dev, &rng->ops);
 303 +       ret = hwrng_register(&rng->ops);
 304 +       if (ret)
 305 +               goto err;
 306 +
 307 +       dev_info(&pdev->dev, "Octeon Random Number Generator\n");
 308 +
 309 +       return 0;
 310 +err:
 311 +       devm_iounmap(&pdev->dev, rng->control_status);
 312 +err_r:
 313 +       devm_iounmap(&pdev->dev, rng->result);
 314 +err_ports:
 315 +       devm_kfree(&pdev->dev, rng);
 316 +       return -ENOENT;
 317 +}
 318 +
 319 +static int __exit octeon_rng_remove(struct platform_device *pdev)
 320 +{
 321 +       struct hwrng *rng = dev_get_drvdata(&pdev->dev);
 322 +
 323 +       hwrng_unregister(rng);
 324 +
 325 +       return 0;
 326 +}
 327 +
 328 +static struct platform_driver octeon_rng_driver = {
 329 +       .driver = {
 330 +               .name           = "octeon_rng",
 331 +               .owner          = THIS_MODULE,
 332 +       },
 333 +       .probe          = octeon_rng_probe,
 334 +       .remove         = __exit_p(octeon_rng_remove),
 335 +};
 336 +
 337 +static int __init octeon_rng_mod_init(void)
 338 +{
 339 +       return platform_driver_register(&octeon_rng_driver);
 340 +}
 341 +
 342 +static void __exit octeon_rng_mod_exit(void)
 343 +{
 344 +       platform_driver_unregister(&octeon_rng_driver);
 345 +}
 346 +
 347 +module_init(octeon_rng_mod_init);
 348 +module_exit(octeon_rng_mod_exit);
 349 +
 350 +MODULE_AUTHOR("David Daney");
 351 +MODULE_LICENSE("GPL");