arch/mips/bcm63xx/clk.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/mutex.h>
  11 #include <linux/err.h>
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <bcm63xx_cpu.h>
  15 #include <bcm63xx_io.h>
  16 #include <bcm63xx_regs.h>
  17 #include <bcm63xx_reset.h>
  18
  19 struct clk {
  20         void            (*set)(struct clk *, int);
  21         unsigned int    rate;
  22         unsigned int    usage;
  23         int             id;
  24 };
  25
  26 static DEFINE_MUTEX(clocks_mutex);
  27
  28
  29 static void clk_enable_unlocked(struct clk *clk)
  30 {
  31         if (clk->set && (clk->usage++) == 0)
  32                 clk->set(clk, 1);
  33 }
  34
  35 static void clk_disable_unlocked(struct clk *clk)
  36 {
  37         if (clk->set && (--clk->usage) == 0)
  38                 clk->set(clk, 0);
  39 }
  40
  41 static void bcm_hwclock_set(u32 mask, int enable)
  42 {
  43         u32 reg;
  44
  45         reg = bcm_perf_readl(PERF_CKCTL_REG);
  46         if (enable)
  47                 reg |= mask;
  48         else
  49                 reg &= ~mask;
  50         bcm_perf_writel(reg, PERF_CKCTL_REG);
  51 }
  52
  53 /*
  54  * Ethernet MAC "misc" clock: dma clocks and main clock on 6348
  55  */
  56 static void enet_misc_set(struct clk *clk, int enable)
  57 {
  58         u32 mask;
  59
  60         if (BCMCPU_IS_6338())
  61                 mask = CKCTL_6338_ENET_EN;
  62         else if (BCMCPU_IS_6345())
  63                 mask = CKCTL_6345_ENET_EN;
  64         else if (BCMCPU_IS_6348())
  65                 mask = CKCTL_6348_ENET_EN;
  66         else
  67                 /* BCMCPU_IS_6358 */
  68                 mask = CKCTL_6358_EMUSB_EN;
  69         bcm_hwclock_set(mask, enable);
  70 }
  71
  72 static struct clk clk_enet_misc = {
  73         .set    = enet_misc_set,
  74 };
  75
  76 /*
  77  * Ethernet MAC clocks: only revelant on 6358, silently enable misc
  78  * clocks
  79  */
  80 static void enetx_set(struct clk *clk, int enable)
  81 {
  82         if (enable)
  83                 clk_enable_unlocked(&clk_enet_misc);
  84         else
  85                 clk_disable_unlocked(&clk_enet_misc);
  86
  87         if (BCMCPU_IS_3368() || BCMCPU_IS_6358()) {
  88                 u32 mask;
  89
  90                 if (clk->id == 0)
  91                         mask = CKCTL_6358_ENET0_EN;
  92                 else
  93                         mask = CKCTL_6358_ENET1_EN;
  94                 bcm_hwclock_set(mask, enable);
  95         }
  96 }
  97
  98 static struct clk clk_enet0 = {
  99         .id     = 0,
 100         .set    = enetx_set,
 101 };
 102
 103 static struct clk clk_enet1 = {
 104         .id     = 1,
 105         .set    = enetx_set,
 106 };
 107
 108 /*
 109  * Ethernet PHY clock
 110  */
 111 static void ephy_set(struct clk *clk, int enable)
 112 {
 113         if (BCMCPU_IS_3368() || BCMCPU_IS_6358())
 114                 bcm_hwclock_set(CKCTL_6358_EPHY_EN, enable);
 115 }
 116
 117
 118 static struct clk clk_ephy = {
 119         .set    = ephy_set,
 120 };
 121
 122 /*
 123  * Ethernet switch clock
 124  */
 125 static void enetsw_set(struct clk *clk, int enable)
 126 {
 127         if (BCMCPU_IS_6328())
 128                 bcm_hwclock_set(CKCTL_6328_ROBOSW_EN, enable);
 129         else if (BCMCPU_IS_6362())
 130                 bcm_hwclock_set(CKCTL_6362_ROBOSW_EN, enable);
 131         else if (BCMCPU_IS_6368())
 132                 bcm_hwclock_set(CKCTL_6368_ROBOSW_EN |
 133                                 CKCTL_6368_SWPKT_USB_EN |
 134                                 CKCTL_6368_SWPKT_SAR_EN,
 135                                 enable);
 136         else
 137                 return;
 138
 139         if (enable) {
 140                 /* reset switch core afer clock change */
 141                 bcm63xx_core_set_reset(BCM63XX_RESET_ENETSW, 1);
 142                 msleep(10);
 143                 bcm63xx_core_set_reset(BCM63XX_RESET_ENETSW, 0);
 144                 msleep(10);
 145         }
 146 }
 147
 148 static struct clk clk_enetsw = {
 149         .set    = enetsw_set,
 150 };
 151
 152 /*
 153  * PCM clock
 154  */
 155 static void pcm_set(struct clk *clk, int enable)
 156 {
 157         if (BCMCPU_IS_3368())
 158                 bcm_hwclock_set(CKCTL_3368_PCM_EN, enable);
 159         if (BCMCPU_IS_6358())
 160                 bcm_hwclock_set(CKCTL_6358_PCM_EN, enable);
 161 }
 162
 163 static struct clk clk_pcm = {
 164         .set    = pcm_set,
 165 };
 166
 167 /*
 168  * USB host clock
 169  */
 170 static void usbh_set(struct clk *clk, int enable)
 171 {
 172         if (BCMCPU_IS_6328())
 173                 bcm_hwclock_set(CKCTL_6328_USBH_EN, enable);
 174         else if (BCMCPU_IS_6348())
 175                 bcm_hwclock_set(CKCTL_6348_USBH_EN, enable);
 176         else if (BCMCPU_IS_6362())
 177                 bcm_hwclock_set(CKCTL_6362_USBH_EN, enable);
 178         else if (BCMCPU_IS_6368())
 179                 bcm_hwclock_set(CKCTL_6368_USBH_EN, enable);
 180 }
 181
 182 static struct clk clk_usbh = {
 183         .set    = usbh_set,
 184 };
 185
 186 /*
 187  * USB device clock
 188  */
 189 static void usbd_set(struct clk *clk, int enable)
 190 {
 191         if (BCMCPU_IS_6328())
 192                 bcm_hwclock_set(CKCTL_6328_USBD_EN, enable);
 193         else if (BCMCPU_IS_6362())
 194                 bcm_hwclock_set(CKCTL_6362_USBD_EN, enable);
 195         else if (BCMCPU_IS_6368())
 196                 bcm_hwclock_set(CKCTL_6368_USBD_EN, enable);
 197 }
 198
 199 static struct clk clk_usbd = {
 200         .set    = usbd_set,
 201 };
 202
 203 /*
 204  * SPI clock
 205  */
 206 static void spi_set(struct clk *clk, int enable)
 207 {
 208         u32 mask;
 209
 210         if (BCMCPU_IS_6338())
 211                 mask = CKCTL_6338_SPI_EN;
 212         else if (BCMCPU_IS_6348())
 213                 mask = CKCTL_6348_SPI_EN;
 214         else if (BCMCPU_IS_3368() || BCMCPU_IS_6358())
 215                 mask = CKCTL_6358_SPI_EN;
 216         else if (BCMCPU_IS_6362())
 217                 mask = CKCTL_6362_SPI_EN;
 218         else
 219                 /* BCMCPU_IS_6368 */
 220                 mask = CKCTL_6368_SPI_EN;
 221         bcm_hwclock_set(mask, enable);
 222 }
 223
 224 static struct clk clk_spi = {
 225         .set    = spi_set,
 226 };
 227
 228 /*
 229  * XTM clock
 230  */
 231 static void xtm_set(struct clk *clk, int enable)
 232 {
 233         if (!BCMCPU_IS_6368())
 234                 return;
 235
 236         bcm_hwclock_set(CKCTL_6368_SAR_EN |
 237                         CKCTL_6368_SWPKT_SAR_EN, enable);
 238
 239         if (enable) {
 240                 /* reset sar core afer clock change */
 241                 bcm63xx_core_set_reset(BCM63XX_RESET_SAR, 1);
 242                 mdelay(1);
 243                 bcm63xx_core_set_reset(BCM63XX_RESET_SAR, 0);
 244                 mdelay(1);
 245         }
 246 }
 247
 248
 249 static struct clk clk_xtm = {
 250         .set    = xtm_set,
 251 };
 252
 253 /*
 254  * IPsec clock
 255  */
 256 static void ipsec_set(struct clk *clk, int enable)
 257 {
 258         if (BCMCPU_IS_6362())
 259                 bcm_hwclock_set(CKCTL_6362_IPSEC_EN, enable);
 260         else if (BCMCPU_IS_6368())
 261                 bcm_hwclock_set(CKCTL_6368_IPSEC_EN, enable);
 262 }
 263
 264 static struct clk clk_ipsec = {
 265         .set    = ipsec_set,
 266 };
 267
 268 /*
 269  * PCIe clock
 270  */
 271
 272 static void pcie_set(struct clk *clk, int enable)
 273 {
 274         if (BCMCPU_IS_6328())
 275                 bcm_hwclock_set(CKCTL_6328_PCIE_EN, enable);
 276         else if (BCMCPU_IS_6362())
 277                 bcm_hwclock_set(CKCTL_6362_PCIE_EN, enable);
 278 }
 279
 280 static struct clk clk_pcie = {
 281         .set    = pcie_set,
 282 };
 283
 284 /*
 285  * Internal peripheral clock
 286  */
 287 static struct clk clk_periph = {
 288         .rate   = (50 * 1000 * 1000),
 289 };
 290
 291
 292 /*
 293  * Linux clock API implementation
 294  */
 295 int clk_enable(struct clk *clk)
 296 {
 297         mutex_lock(&clocks_mutex);
 298         clk_enable_unlocked(clk);
 299         mutex_unlock(&clocks_mutex);
 300         return 0;
 301 }
 302
 303 EXPORT_SYMBOL(clk_enable);
 304
 305 void clk_disable(struct clk *clk)
 306 {
 307         mutex_lock(&clocks_mutex);
 308         clk_disable_unlocked(clk);
 309         mutex_unlock(&clocks_mutex);
 310 }
 311
 312 EXPORT_SYMBOL(clk_disable);
 313
 314 unsigned long clk_get_rate(struct clk *clk)
 315 {
 316         return clk->rate;
 317 }
 318
 319 EXPORT_SYMBOL(clk_get_rate);
 320
 321 int clk_set_rate(struct clk *clk, unsigned long rate)
 322 {
 323         return 0;
 324 }
 325 EXPORT_SYMBOL_GPL(clk_set_rate);
 326
 327 long clk_round_rate(struct clk *clk, unsigned long rate)
 328 {
 329         return 0;
 330 }
 331 EXPORT_SYMBOL_GPL(clk_round_rate);
 332
 333 struct clk *clk_get(struct device *dev, const char *id)
 334 {
 335         if (!strcmp(id, "enet0"))
 336                 return &clk_enet0;
 337         if (!strcmp(id, "enet1"))
 338                 return &clk_enet1;
 339         if (!strcmp(id, "enetsw"))
 340                 return &clk_enetsw;
 341         if (!strcmp(id, "ephy"))
 342                 return &clk_ephy;
 343         if (!strcmp(id, "usbh"))
 344                 return &clk_usbh;
 345         if (!strcmp(id, "usbd"))
 346                 return &clk_usbd;
 347         if (!strcmp(id, "spi"))
 348                 return &clk_spi;
 349         if (!strcmp(id, "xtm"))
 350                 return &clk_xtm;
 351         if (!strcmp(id, "periph"))
 352                 return &clk_periph;
 353         if ((BCMCPU_IS_3368() || BCMCPU_IS_6358()) && !strcmp(id, "pcm"))
 354                 return &clk_pcm;
 355         if ((BCMCPU_IS_6362() || BCMCPU_IS_6368()) && !strcmp(id, "ipsec"))
 356                 return &clk_ipsec;
 357         if ((BCMCPU_IS_6328() || BCMCPU_IS_6362()) && !strcmp(id, "pcie"))
 358                 return &clk_pcie;
 359         return ERR_PTR(-ENOENT);
 360 }
 361
 362 EXPORT_SYMBOL(clk_get);
 363
 364 void clk_put(struct clk *clk)
 365 {
 366 }
 367
 368 EXPORT_SYMBOL(clk_put);