Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/clk.h> |
| 22 | #include <linux/io.h> |
| 23 | #include <linux/jiffies.h> |
Sascha Hauer | b9214b9 | 2011-01-13 16:59:25 +0100 | [diff] [blame] | 24 | #include <linux/clkdev.h> |
Dong Aisheng | 4e1b4ec | 2011-11-22 23:54:23 +0800 | [diff] [blame] | 25 | #include <linux/spinlock.h> |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 26 | |
| 27 | #include <asm/clkdev.h> |
| 28 | #include <asm/div64.h> |
| 29 | |
| 30 | #include <mach/mx28.h> |
| 31 | #include <mach/common.h> |
| 32 | #include <mach/clock.h> |
Dong Aisheng | 4e1b4ec | 2011-11-22 23:54:23 +0800 | [diff] [blame] | 33 | #include <mach/digctl.h> |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 34 | |
| 35 | #include "regs-clkctrl-mx28.h" |
| 36 | |
| 37 | #define CLKCTRL_BASE_ADDR MX28_IO_ADDRESS(MX28_CLKCTRL_BASE_ADDR) |
| 38 | #define DIGCTRL_BASE_ADDR MX28_IO_ADDRESS(MX28_DIGCTL_BASE_ADDR) |
| 39 | |
| 40 | #define PARENT_RATE_SHIFT 8 |
| 41 | |
| 42 | static struct clk pll2_clk; |
| 43 | static struct clk cpu_clk; |
| 44 | static struct clk emi_clk; |
| 45 | static struct clk saif0_clk; |
| 46 | static struct clk saif1_clk; |
| 47 | static struct clk clk32k_clk; |
Dong Aisheng | 4e1b4ec | 2011-11-22 23:54:23 +0800 | [diff] [blame] | 48 | static DEFINE_SPINLOCK(clkmux_lock); |
| 49 | |
| 50 | /* |
| 51 | * HW_SAIF_CLKMUX_SEL: |
| 52 | * DIRECT(0x0): SAIF0 clock pins selected for SAIF0 input clocks, and SAIF1 |
| 53 | * clock pins selected for SAIF1 input clocks. |
| 54 | * CROSSINPUT(0x1): SAIF1 clock inputs selected for SAIF0 input clocks, and |
| 55 | * SAIF0 clock inputs selected for SAIF1 input clocks. |
| 56 | * EXTMSTR0(0x2): SAIF0 clock pin selected for both SAIF0 and SAIF1 input |
| 57 | * clocks. |
| 58 | * EXTMSTR1(0x3): SAIF1 clock pin selected for both SAIF0 and SAIF1 input |
| 59 | * clocks. |
| 60 | */ |
| 61 | int mxs_saif_clkmux_select(unsigned int clkmux) |
| 62 | { |
| 63 | if (clkmux > 0x3) |
| 64 | return -EINVAL; |
| 65 | |
| 66 | spin_lock(&clkmux_lock); |
| 67 | __raw_writel(BM_DIGCTL_CTRL_SAIF_CLKMUX, |
| 68 | DIGCTRL_BASE_ADDR + HW_DIGCTL_CTRL + MXS_CLR_ADDR); |
| 69 | __raw_writel(clkmux << BP_DIGCTL_CTRL_SAIF_CLKMUX, |
| 70 | DIGCTRL_BASE_ADDR + HW_DIGCTL_CTRL + MXS_SET_ADDR); |
| 71 | spin_unlock(&clkmux_lock); |
| 72 | |
| 73 | return 0; |
| 74 | } |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 75 | |
| 76 | static int _raw_clk_enable(struct clk *clk) |
| 77 | { |
| 78 | u32 reg; |
| 79 | |
| 80 | if (clk->enable_reg) { |
| 81 | reg = __raw_readl(clk->enable_reg); |
| 82 | reg &= ~(1 << clk->enable_shift); |
| 83 | __raw_writel(reg, clk->enable_reg); |
| 84 | } |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static void _raw_clk_disable(struct clk *clk) |
| 90 | { |
| 91 | u32 reg; |
| 92 | |
| 93 | if (clk->enable_reg) { |
| 94 | reg = __raw_readl(clk->enable_reg); |
| 95 | reg |= 1 << clk->enable_shift; |
| 96 | __raw_writel(reg, clk->enable_reg); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * ref_xtal_clk |
| 102 | */ |
| 103 | static unsigned long ref_xtal_clk_get_rate(struct clk *clk) |
| 104 | { |
| 105 | return 24000000; |
| 106 | } |
| 107 | |
| 108 | static struct clk ref_xtal_clk = { |
| 109 | .get_rate = ref_xtal_clk_get_rate, |
| 110 | }; |
| 111 | |
| 112 | /* |
| 113 | * pll_clk |
| 114 | */ |
| 115 | static unsigned long pll0_clk_get_rate(struct clk *clk) |
| 116 | { |
| 117 | return 480000000; |
| 118 | } |
| 119 | |
| 120 | static unsigned long pll1_clk_get_rate(struct clk *clk) |
| 121 | { |
| 122 | return 480000000; |
| 123 | } |
| 124 | |
| 125 | static unsigned long pll2_clk_get_rate(struct clk *clk) |
| 126 | { |
| 127 | return 50000000; |
| 128 | } |
| 129 | |
| 130 | #define _CLK_ENABLE_PLL(name, r, g) \ |
| 131 | static int name##_enable(struct clk *clk) \ |
| 132 | { \ |
| 133 | __raw_writel(BM_CLKCTRL_##r##CTRL0_POWER, \ |
| 134 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \ |
| 135 | udelay(10); \ |
| 136 | \ |
| 137 | if (clk == &pll2_clk) \ |
| 138 | __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \ |
| 139 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \ |
| 140 | else \ |
| 141 | __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \ |
| 142 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \ |
| 143 | \ |
| 144 | return 0; \ |
| 145 | } |
| 146 | |
| 147 | _CLK_ENABLE_PLL(pll0_clk, PLL0, EN_USB_CLKS) |
| 148 | _CLK_ENABLE_PLL(pll1_clk, PLL1, EN_USB_CLKS) |
| 149 | _CLK_ENABLE_PLL(pll2_clk, PLL2, CLKGATE) |
| 150 | |
| 151 | #define _CLK_DISABLE_PLL(name, r, g) \ |
| 152 | static void name##_disable(struct clk *clk) \ |
| 153 | { \ |
| 154 | __raw_writel(BM_CLKCTRL_##r##CTRL0_POWER, \ |
| 155 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \ |
| 156 | \ |
| 157 | if (clk == &pll2_clk) \ |
| 158 | __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \ |
| 159 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \ |
| 160 | else \ |
| 161 | __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \ |
| 162 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \ |
| 163 | \ |
| 164 | } |
| 165 | |
| 166 | _CLK_DISABLE_PLL(pll0_clk, PLL0, EN_USB_CLKS) |
| 167 | _CLK_DISABLE_PLL(pll1_clk, PLL1, EN_USB_CLKS) |
| 168 | _CLK_DISABLE_PLL(pll2_clk, PLL2, CLKGATE) |
| 169 | |
| 170 | #define _DEFINE_CLOCK_PLL(name) \ |
| 171 | static struct clk name = { \ |
| 172 | .get_rate = name##_get_rate, \ |
| 173 | .enable = name##_enable, \ |
| 174 | .disable = name##_disable, \ |
| 175 | .parent = &ref_xtal_clk, \ |
| 176 | } |
| 177 | |
| 178 | _DEFINE_CLOCK_PLL(pll0_clk); |
| 179 | _DEFINE_CLOCK_PLL(pll1_clk); |
| 180 | _DEFINE_CLOCK_PLL(pll2_clk); |
| 181 | |
| 182 | /* |
| 183 | * ref_clk |
| 184 | */ |
| 185 | #define _CLK_GET_RATE_REF(name, sr, ss) \ |
| 186 | static unsigned long name##_get_rate(struct clk *clk) \ |
| 187 | { \ |
| 188 | unsigned long parent_rate; \ |
| 189 | u32 reg, div; \ |
| 190 | \ |
| 191 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##sr); \ |
| 192 | div = (reg >> BP_CLKCTRL_##sr##_##ss##FRAC) & 0x3f; \ |
| 193 | parent_rate = clk_get_rate(clk->parent); \ |
| 194 | \ |
| 195 | return SH_DIV((parent_rate >> PARENT_RATE_SHIFT) * 18, \ |
| 196 | div, PARENT_RATE_SHIFT); \ |
| 197 | } |
| 198 | |
| 199 | _CLK_GET_RATE_REF(ref_cpu_clk, FRAC0, CPU) |
| 200 | _CLK_GET_RATE_REF(ref_emi_clk, FRAC0, EMI) |
| 201 | _CLK_GET_RATE_REF(ref_io0_clk, FRAC0, IO0) |
| 202 | _CLK_GET_RATE_REF(ref_io1_clk, FRAC0, IO1) |
| 203 | _CLK_GET_RATE_REF(ref_pix_clk, FRAC1, PIX) |
| 204 | _CLK_GET_RATE_REF(ref_gpmi_clk, FRAC1, GPMI) |
| 205 | |
| 206 | #define _DEFINE_CLOCK_REF(name, er, es) \ |
| 207 | static struct clk name = { \ |
| 208 | .enable_reg = CLKCTRL_BASE_ADDR + HW_CLKCTRL_##er, \ |
| 209 | .enable_shift = BP_CLKCTRL_##er##_CLKGATE##es, \ |
| 210 | .get_rate = name##_get_rate, \ |
| 211 | .enable = _raw_clk_enable, \ |
| 212 | .disable = _raw_clk_disable, \ |
| 213 | .parent = &pll0_clk, \ |
| 214 | } |
| 215 | |
| 216 | _DEFINE_CLOCK_REF(ref_cpu_clk, FRAC0, CPU); |
| 217 | _DEFINE_CLOCK_REF(ref_emi_clk, FRAC0, EMI); |
| 218 | _DEFINE_CLOCK_REF(ref_io0_clk, FRAC0, IO0); |
| 219 | _DEFINE_CLOCK_REF(ref_io1_clk, FRAC0, IO1); |
| 220 | _DEFINE_CLOCK_REF(ref_pix_clk, FRAC1, PIX); |
| 221 | _DEFINE_CLOCK_REF(ref_gpmi_clk, FRAC1, GPMI); |
| 222 | |
| 223 | /* |
| 224 | * General clocks |
| 225 | * |
| 226 | * clk_get_rate |
| 227 | */ |
| 228 | static unsigned long lradc_clk_get_rate(struct clk *clk) |
| 229 | { |
| 230 | return clk_get_rate(clk->parent) / 16; |
| 231 | } |
| 232 | |
| 233 | static unsigned long rtc_clk_get_rate(struct clk *clk) |
| 234 | { |
| 235 | /* ref_xtal_clk is implemented as the only parent */ |
| 236 | return clk_get_rate(clk->parent) / 768; |
| 237 | } |
| 238 | |
| 239 | static unsigned long clk32k_clk_get_rate(struct clk *clk) |
| 240 | { |
| 241 | return clk->parent->get_rate(clk->parent) / 750; |
| 242 | } |
| 243 | |
| 244 | static unsigned long spdif_clk_get_rate(struct clk *clk) |
| 245 | { |
| 246 | return clk_get_rate(clk->parent) / 4; |
| 247 | } |
| 248 | |
| 249 | #define _CLK_GET_RATE(name, rs) \ |
| 250 | static unsigned long name##_get_rate(struct clk *clk) \ |
| 251 | { \ |
| 252 | u32 reg, div; \ |
| 253 | \ |
| 254 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \ |
| 255 | \ |
| 256 | if (clk->parent == &ref_xtal_clk) \ |
| 257 | div = (reg & BM_CLKCTRL_##rs##_DIV_XTAL) >> \ |
| 258 | BP_CLKCTRL_##rs##_DIV_XTAL; \ |
| 259 | else \ |
| 260 | div = (reg & BM_CLKCTRL_##rs##_DIV_##rs) >> \ |
| 261 | BP_CLKCTRL_##rs##_DIV_##rs; \ |
| 262 | \ |
| 263 | if (!div) \ |
| 264 | return -EINVAL; \ |
| 265 | \ |
| 266 | return clk_get_rate(clk->parent) / div; \ |
| 267 | } |
| 268 | |
| 269 | _CLK_GET_RATE(cpu_clk, CPU) |
| 270 | _CLK_GET_RATE(emi_clk, EMI) |
| 271 | |
| 272 | #define _CLK_GET_RATE1(name, rs) \ |
| 273 | static unsigned long name##_get_rate(struct clk *clk) \ |
| 274 | { \ |
| 275 | u32 reg, div; \ |
| 276 | \ |
| 277 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \ |
| 278 | div = (reg & BM_CLKCTRL_##rs##_DIV) >> BP_CLKCTRL_##rs##_DIV; \ |
| 279 | \ |
| 280 | if (!div) \ |
| 281 | return -EINVAL; \ |
| 282 | \ |
| 283 | if (clk == &saif0_clk || clk == &saif1_clk) \ |
| 284 | return clk_get_rate(clk->parent) >> 16 * div; \ |
| 285 | else \ |
| 286 | return clk_get_rate(clk->parent) / div; \ |
| 287 | } |
| 288 | |
| 289 | _CLK_GET_RATE1(hbus_clk, HBUS) |
| 290 | _CLK_GET_RATE1(xbus_clk, XBUS) |
| 291 | _CLK_GET_RATE1(ssp0_clk, SSP0) |
| 292 | _CLK_GET_RATE1(ssp1_clk, SSP1) |
| 293 | _CLK_GET_RATE1(ssp2_clk, SSP2) |
| 294 | _CLK_GET_RATE1(ssp3_clk, SSP3) |
| 295 | _CLK_GET_RATE1(gpmi_clk, GPMI) |
| 296 | _CLK_GET_RATE1(lcdif_clk, DIS_LCDIF) |
| 297 | _CLK_GET_RATE1(saif0_clk, SAIF0) |
| 298 | _CLK_GET_RATE1(saif1_clk, SAIF1) |
| 299 | |
| 300 | #define _CLK_GET_RATE_STUB(name) \ |
| 301 | static unsigned long name##_get_rate(struct clk *clk) \ |
| 302 | { \ |
| 303 | return clk_get_rate(clk->parent); \ |
| 304 | } |
| 305 | |
| 306 | _CLK_GET_RATE_STUB(uart_clk) |
| 307 | _CLK_GET_RATE_STUB(pwm_clk) |
| 308 | _CLK_GET_RATE_STUB(can0_clk) |
| 309 | _CLK_GET_RATE_STUB(can1_clk) |
| 310 | _CLK_GET_RATE_STUB(fec_clk) |
| 311 | |
| 312 | /* |
| 313 | * clk_set_rate |
| 314 | */ |
| 315 | /* fool compiler */ |
| 316 | #define BM_CLKCTRL_CPU_DIV 0 |
| 317 | #define BP_CLKCTRL_CPU_DIV 0 |
| 318 | #define BM_CLKCTRL_CPU_BUSY 0 |
| 319 | |
| 320 | #define _CLK_SET_RATE(name, dr, fr, fs) \ |
| 321 | static int name##_set_rate(struct clk *clk, unsigned long rate) \ |
| 322 | { \ |
| 323 | u32 reg, bm_busy, div_max, d, f, div, frac; \ |
| 324 | unsigned long diff, parent_rate, calc_rate; \ |
| 325 | int i; \ |
| 326 | \ |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 327 | div_max = BM_CLKCTRL_##dr##_DIV >> BP_CLKCTRL_##dr##_DIV; \ |
| 328 | bm_busy = BM_CLKCTRL_##dr##_BUSY; \ |
| 329 | \ |
| 330 | if (clk->parent == &ref_xtal_clk) { \ |
Uwe Kleine-König | f61b9fc | 2011-04-04 16:06:12 +0200 | [diff] [blame] | 331 | parent_rate = clk_get_rate(clk->parent); \ |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 332 | div = DIV_ROUND_UP(parent_rate, rate); \ |
| 333 | if (clk == &cpu_clk) { \ |
| 334 | div_max = BM_CLKCTRL_CPU_DIV_XTAL >> \ |
| 335 | BP_CLKCTRL_CPU_DIV_XTAL; \ |
| 336 | bm_busy = BM_CLKCTRL_CPU_BUSY_REF_XTAL; \ |
| 337 | } \ |
| 338 | if (div == 0 || div > div_max) \ |
| 339 | return -EINVAL; \ |
| 340 | } else { \ |
Uwe Kleine-König | f61b9fc | 2011-04-04 16:06:12 +0200 | [diff] [blame] | 341 | /* \ |
| 342 | * hack alert: this block modifies clk->parent, too, \ |
| 343 | * so the base to use it the grand parent. \ |
| 344 | */ \ |
| 345 | parent_rate = clk_get_rate(clk->parent->parent); \ |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 346 | rate >>= PARENT_RATE_SHIFT; \ |
| 347 | parent_rate >>= PARENT_RATE_SHIFT; \ |
| 348 | diff = parent_rate; \ |
| 349 | div = frac = 1; \ |
| 350 | if (clk == &cpu_clk) { \ |
| 351 | div_max = BM_CLKCTRL_CPU_DIV_CPU >> \ |
| 352 | BP_CLKCTRL_CPU_DIV_CPU; \ |
| 353 | bm_busy = BM_CLKCTRL_CPU_BUSY_REF_CPU; \ |
| 354 | } \ |
| 355 | for (d = 1; d <= div_max; d++) { \ |
| 356 | f = parent_rate * 18 / d / rate; \ |
| 357 | if ((parent_rate * 18 / d) % rate) \ |
| 358 | f++; \ |
| 359 | if (f < 18 || f > 35) \ |
| 360 | continue; \ |
| 361 | \ |
| 362 | calc_rate = parent_rate * 18 / f / d; \ |
| 363 | if (calc_rate > rate) \ |
| 364 | continue; \ |
| 365 | \ |
| 366 | if (rate - calc_rate < diff) { \ |
| 367 | frac = f; \ |
| 368 | div = d; \ |
| 369 | diff = rate - calc_rate; \ |
| 370 | } \ |
| 371 | \ |
| 372 | if (diff == 0) \ |
| 373 | break; \ |
| 374 | } \ |
| 375 | \ |
| 376 | if (diff == parent_rate) \ |
| 377 | return -EINVAL; \ |
| 378 | \ |
| 379 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##fr); \ |
| 380 | reg &= ~BM_CLKCTRL_##fr##_##fs##FRAC; \ |
Matt Burtch | 590842f | 2011-10-17 09:25:45 -0700 | [diff] [blame] | 381 | reg |= frac << BP_CLKCTRL_##fr##_##fs##FRAC; \ |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 382 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##fr); \ |
| 383 | } \ |
| 384 | \ |
| 385 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \ |
| 386 | if (clk == &cpu_clk) { \ |
| 387 | reg &= ~BM_CLKCTRL_CPU_DIV_CPU; \ |
| 388 | reg |= div << BP_CLKCTRL_CPU_DIV_CPU; \ |
| 389 | } else { \ |
| 390 | reg &= ~BM_CLKCTRL_##dr##_DIV; \ |
| 391 | reg |= div << BP_CLKCTRL_##dr##_DIV; \ |
Sascha Hauer | 13be9f0 | 2011-01-14 14:30:03 +0100 | [diff] [blame] | 392 | if (reg & (1 << clk->enable_shift)) { \ |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 393 | pr_err("%s: clock is gated\n", __func__); \ |
| 394 | return -EINVAL; \ |
| 395 | } \ |
| 396 | } \ |
Sascha Hauer | 34d8073 | 2011-01-14 15:23:12 +0100 | [diff] [blame] | 397 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \ |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 398 | \ |
| 399 | for (i = 10000; i; i--) \ |
| 400 | if (!(__raw_readl(CLKCTRL_BASE_ADDR + \ |
| 401 | HW_CLKCTRL_##dr) & bm_busy)) \ |
| 402 | break; \ |
| 403 | if (!i) { \ |
| 404 | pr_err("%s: divider writing timeout\n", __func__); \ |
| 405 | return -ETIMEDOUT; \ |
| 406 | } \ |
| 407 | \ |
| 408 | return 0; \ |
| 409 | } |
| 410 | |
| 411 | _CLK_SET_RATE(cpu_clk, CPU, FRAC0, CPU) |
| 412 | _CLK_SET_RATE(ssp0_clk, SSP0, FRAC0, IO0) |
| 413 | _CLK_SET_RATE(ssp1_clk, SSP1, FRAC0, IO0) |
| 414 | _CLK_SET_RATE(ssp2_clk, SSP2, FRAC0, IO1) |
| 415 | _CLK_SET_RATE(ssp3_clk, SSP3, FRAC0, IO1) |
| 416 | _CLK_SET_RATE(lcdif_clk, DIS_LCDIF, FRAC1, PIX) |
| 417 | _CLK_SET_RATE(gpmi_clk, GPMI, FRAC1, GPMI) |
| 418 | |
| 419 | #define _CLK_SET_RATE1(name, dr) \ |
| 420 | static int name##_set_rate(struct clk *clk, unsigned long rate) \ |
| 421 | { \ |
| 422 | u32 reg, div_max, div; \ |
| 423 | unsigned long parent_rate; \ |
| 424 | int i; \ |
| 425 | \ |
| 426 | parent_rate = clk_get_rate(clk->parent); \ |
| 427 | div_max = BM_CLKCTRL_##dr##_DIV >> BP_CLKCTRL_##dr##_DIV; \ |
| 428 | \ |
| 429 | div = DIV_ROUND_UP(parent_rate, rate); \ |
| 430 | if (div == 0 || div > div_max) \ |
| 431 | return -EINVAL; \ |
| 432 | \ |
| 433 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \ |
| 434 | reg &= ~BM_CLKCTRL_##dr##_DIV; \ |
| 435 | reg |= div << BP_CLKCTRL_##dr##_DIV; \ |
Wolfram Sang | c273539 | 2011-09-10 12:26:07 +0200 | [diff] [blame] | 436 | if (reg & (1 << clk->enable_shift)) { \ |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 437 | pr_err("%s: clock is gated\n", __func__); \ |
| 438 | return -EINVAL; \ |
| 439 | } \ |
| 440 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \ |
| 441 | \ |
| 442 | for (i = 10000; i; i--) \ |
| 443 | if (!(__raw_readl(CLKCTRL_BASE_ADDR + \ |
| 444 | HW_CLKCTRL_##dr) & BM_CLKCTRL_##dr##_BUSY)) \ |
| 445 | break; \ |
| 446 | if (!i) { \ |
| 447 | pr_err("%s: divider writing timeout\n", __func__); \ |
| 448 | return -ETIMEDOUT; \ |
| 449 | } \ |
| 450 | \ |
| 451 | return 0; \ |
| 452 | } |
| 453 | |
| 454 | _CLK_SET_RATE1(xbus_clk, XBUS) |
| 455 | |
| 456 | /* saif clock uses 16 bits frac div */ |
| 457 | #define _CLK_SET_RATE_SAIF(name, rs) \ |
| 458 | static int name##_set_rate(struct clk *clk, unsigned long rate) \ |
| 459 | { \ |
| 460 | u16 div; \ |
| 461 | u32 reg; \ |
| 462 | u64 lrate; \ |
| 463 | unsigned long parent_rate; \ |
| 464 | int i; \ |
| 465 | \ |
| 466 | parent_rate = clk_get_rate(clk->parent); \ |
| 467 | if (rate > parent_rate) \ |
| 468 | return -EINVAL; \ |
| 469 | \ |
| 470 | lrate = (u64)rate << 16; \ |
| 471 | do_div(lrate, parent_rate); \ |
| 472 | div = (u16)lrate; \ |
| 473 | \ |
| 474 | if (!div) \ |
| 475 | return -EINVAL; \ |
| 476 | \ |
| 477 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \ |
| 478 | reg &= ~BM_CLKCTRL_##rs##_DIV; \ |
| 479 | reg |= div << BP_CLKCTRL_##rs##_DIV; \ |
| 480 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \ |
| 481 | \ |
| 482 | for (i = 10000; i; i--) \ |
| 483 | if (!(__raw_readl(CLKCTRL_BASE_ADDR + \ |
| 484 | HW_CLKCTRL_##rs) & BM_CLKCTRL_##rs##_BUSY)) \ |
| 485 | break; \ |
| 486 | if (!i) { \ |
| 487 | pr_err("%s: divider writing timeout\n", __func__); \ |
| 488 | return -ETIMEDOUT; \ |
| 489 | } \ |
| 490 | \ |
| 491 | return 0; \ |
| 492 | } |
| 493 | |
| 494 | _CLK_SET_RATE_SAIF(saif0_clk, SAIF0) |
| 495 | _CLK_SET_RATE_SAIF(saif1_clk, SAIF1) |
| 496 | |
| 497 | #define _CLK_SET_RATE_STUB(name) \ |
| 498 | static int name##_set_rate(struct clk *clk, unsigned long rate) \ |
| 499 | { \ |
| 500 | return -EINVAL; \ |
| 501 | } |
| 502 | |
| 503 | _CLK_SET_RATE_STUB(emi_clk) |
| 504 | _CLK_SET_RATE_STUB(uart_clk) |
| 505 | _CLK_SET_RATE_STUB(pwm_clk) |
| 506 | _CLK_SET_RATE_STUB(spdif_clk) |
| 507 | _CLK_SET_RATE_STUB(clk32k_clk) |
| 508 | _CLK_SET_RATE_STUB(can0_clk) |
| 509 | _CLK_SET_RATE_STUB(can1_clk) |
| 510 | _CLK_SET_RATE_STUB(fec_clk) |
| 511 | |
| 512 | /* |
| 513 | * clk_set_parent |
| 514 | */ |
| 515 | #define _CLK_SET_PARENT(name, bit) \ |
| 516 | static int name##_set_parent(struct clk *clk, struct clk *parent) \ |
| 517 | { \ |
| 518 | if (parent != clk->parent) { \ |
| 519 | __raw_writel(BM_CLKCTRL_CLKSEQ_BYPASS_##bit, \ |
Shawn Guo | 303783a | 2011-01-27 06:26:36 +0800 | [diff] [blame] | 520 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_CLKSEQ_TOG); \ |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 521 | clk->parent = parent; \ |
| 522 | } \ |
| 523 | \ |
| 524 | return 0; \ |
| 525 | } |
| 526 | |
| 527 | _CLK_SET_PARENT(cpu_clk, CPU) |
| 528 | _CLK_SET_PARENT(emi_clk, EMI) |
| 529 | _CLK_SET_PARENT(ssp0_clk, SSP0) |
| 530 | _CLK_SET_PARENT(ssp1_clk, SSP1) |
| 531 | _CLK_SET_PARENT(ssp2_clk, SSP2) |
| 532 | _CLK_SET_PARENT(ssp3_clk, SSP3) |
| 533 | _CLK_SET_PARENT(lcdif_clk, DIS_LCDIF) |
| 534 | _CLK_SET_PARENT(gpmi_clk, GPMI) |
| 535 | _CLK_SET_PARENT(saif0_clk, SAIF0) |
| 536 | _CLK_SET_PARENT(saif1_clk, SAIF1) |
| 537 | |
| 538 | #define _CLK_SET_PARENT_STUB(name) \ |
| 539 | static int name##_set_parent(struct clk *clk, struct clk *parent) \ |
| 540 | { \ |
| 541 | if (parent != clk->parent) \ |
| 542 | return -EINVAL; \ |
| 543 | else \ |
| 544 | return 0; \ |
| 545 | } |
| 546 | |
| 547 | _CLK_SET_PARENT_STUB(pwm_clk) |
| 548 | _CLK_SET_PARENT_STUB(uart_clk) |
| 549 | _CLK_SET_PARENT_STUB(clk32k_clk) |
| 550 | _CLK_SET_PARENT_STUB(spdif_clk) |
| 551 | _CLK_SET_PARENT_STUB(fec_clk) |
| 552 | _CLK_SET_PARENT_STUB(can0_clk) |
| 553 | _CLK_SET_PARENT_STUB(can1_clk) |
| 554 | |
| 555 | /* |
| 556 | * clk definition |
| 557 | */ |
| 558 | static struct clk cpu_clk = { |
| 559 | .get_rate = cpu_clk_get_rate, |
| 560 | .set_rate = cpu_clk_set_rate, |
| 561 | .set_parent = cpu_clk_set_parent, |
| 562 | .parent = &ref_cpu_clk, |
| 563 | }; |
| 564 | |
| 565 | static struct clk hbus_clk = { |
| 566 | .get_rate = hbus_clk_get_rate, |
| 567 | .parent = &cpu_clk, |
| 568 | }; |
| 569 | |
| 570 | static struct clk xbus_clk = { |
| 571 | .get_rate = xbus_clk_get_rate, |
| 572 | .set_rate = xbus_clk_set_rate, |
| 573 | .parent = &ref_xtal_clk, |
| 574 | }; |
| 575 | |
| 576 | static struct clk lradc_clk = { |
| 577 | .get_rate = lradc_clk_get_rate, |
| 578 | .parent = &clk32k_clk, |
| 579 | }; |
| 580 | |
| 581 | static struct clk rtc_clk = { |
| 582 | .get_rate = rtc_clk_get_rate, |
| 583 | .parent = &ref_xtal_clk, |
| 584 | }; |
| 585 | |
| 586 | /* usb_clk gate is controlled in DIGCTRL other than CLKCTRL */ |
| 587 | static struct clk usb0_clk = { |
| 588 | .enable_reg = DIGCTRL_BASE_ADDR, |
| 589 | .enable_shift = 2, |
| 590 | .enable = _raw_clk_enable, |
| 591 | .disable = _raw_clk_disable, |
| 592 | .parent = &pll0_clk, |
| 593 | }; |
| 594 | |
| 595 | static struct clk usb1_clk = { |
| 596 | .enable_reg = DIGCTRL_BASE_ADDR, |
| 597 | .enable_shift = 16, |
| 598 | .enable = _raw_clk_enable, |
| 599 | .disable = _raw_clk_disable, |
| 600 | .parent = &pll1_clk, |
| 601 | }; |
| 602 | |
| 603 | #define _DEFINE_CLOCK(name, er, es, p) \ |
| 604 | static struct clk name = { \ |
| 605 | .enable_reg = CLKCTRL_BASE_ADDR + HW_CLKCTRL_##er, \ |
| 606 | .enable_shift = BP_CLKCTRL_##er##_##es, \ |
| 607 | .get_rate = name##_get_rate, \ |
| 608 | .set_rate = name##_set_rate, \ |
| 609 | .set_parent = name##_set_parent, \ |
| 610 | .enable = _raw_clk_enable, \ |
| 611 | .disable = _raw_clk_disable, \ |
| 612 | .parent = p, \ |
| 613 | } |
| 614 | |
| 615 | _DEFINE_CLOCK(emi_clk, EMI, CLKGATE, &ref_xtal_clk); |
| 616 | _DEFINE_CLOCK(ssp0_clk, SSP0, CLKGATE, &ref_xtal_clk); |
| 617 | _DEFINE_CLOCK(ssp1_clk, SSP1, CLKGATE, &ref_xtal_clk); |
| 618 | _DEFINE_CLOCK(ssp2_clk, SSP2, CLKGATE, &ref_xtal_clk); |
| 619 | _DEFINE_CLOCK(ssp3_clk, SSP3, CLKGATE, &ref_xtal_clk); |
| 620 | _DEFINE_CLOCK(lcdif_clk, DIS_LCDIF, CLKGATE, &ref_xtal_clk); |
| 621 | _DEFINE_CLOCK(gpmi_clk, GPMI, CLKGATE, &ref_xtal_clk); |
| 622 | _DEFINE_CLOCK(saif0_clk, SAIF0, CLKGATE, &ref_xtal_clk); |
| 623 | _DEFINE_CLOCK(saif1_clk, SAIF1, CLKGATE, &ref_xtal_clk); |
| 624 | _DEFINE_CLOCK(can0_clk, FLEXCAN, STOP_CAN0, &ref_xtal_clk); |
| 625 | _DEFINE_CLOCK(can1_clk, FLEXCAN, STOP_CAN1, &ref_xtal_clk); |
| 626 | _DEFINE_CLOCK(pwm_clk, XTAL, PWM_CLK24M_GATE, &ref_xtal_clk); |
| 627 | _DEFINE_CLOCK(uart_clk, XTAL, UART_CLK_GATE, &ref_xtal_clk); |
| 628 | _DEFINE_CLOCK(clk32k_clk, XTAL, TIMROT_CLK32K_GATE, &ref_xtal_clk); |
| 629 | _DEFINE_CLOCK(spdif_clk, SPDIF, CLKGATE, &pll0_clk); |
| 630 | _DEFINE_CLOCK(fec_clk, ENET, DISABLE, &hbus_clk); |
| 631 | |
| 632 | #define _REGISTER_CLOCK(d, n, c) \ |
| 633 | { \ |
| 634 | .dev_id = d, \ |
| 635 | .con_id = n, \ |
| 636 | .clk = &c, \ |
| 637 | }, |
| 638 | |
| 639 | static struct clk_lookup lookups[] = { |
Shawn Guo | dbc4245 | 2011-01-04 14:20:52 +0800 | [diff] [blame] | 640 | /* for amba bus driver */ |
| 641 | _REGISTER_CLOCK("duart", "apb_pclk", xbus_clk) |
| 642 | /* for amba-pl011 driver */ |
| 643 | _REGISTER_CLOCK("duart", NULL, uart_clk) |
Shawn Guo | b2878fa | 2011-01-06 15:13:14 +0800 | [diff] [blame] | 644 | _REGISTER_CLOCK("imx28-fec.0", NULL, fec_clk) |
| 645 | _REGISTER_CLOCK("imx28-fec.1", NULL, fec_clk) |
Sascha Hauer | cf3567a | 2011-01-11 15:56:40 +0100 | [diff] [blame] | 646 | _REGISTER_CLOCK("mxs-auart.0", NULL, uart_clk) |
| 647 | _REGISTER_CLOCK("mxs-auart.1", NULL, uart_clk) |
| 648 | _REGISTER_CLOCK("mxs-auart.2", NULL, uart_clk) |
| 649 | _REGISTER_CLOCK("mxs-auart.3", NULL, uart_clk) |
| 650 | _REGISTER_CLOCK("mxs-auart.4", NULL, uart_clk) |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 651 | _REGISTER_CLOCK("rtc", NULL, rtc_clk) |
| 652 | _REGISTER_CLOCK("pll2", NULL, pll2_clk) |
Shawn Guo | 3baa4fe | 2011-02-22 21:36:27 +0800 | [diff] [blame] | 653 | _REGISTER_CLOCK("mxs-dma-apbh", NULL, hbus_clk) |
| 654 | _REGISTER_CLOCK("mxs-dma-apbx", NULL, xbus_clk) |
Shawn Guo | 47babe6 | 2011-03-16 11:31:06 +0100 | [diff] [blame] | 655 | _REGISTER_CLOCK("mxs-mmc.0", NULL, ssp0_clk) |
| 656 | _REGISTER_CLOCK("mxs-mmc.1", NULL, ssp1_clk) |
Marc Kleine-Budde | 6ea038a | 2011-02-02 13:50:29 +0100 | [diff] [blame] | 657 | _REGISTER_CLOCK("flexcan.0", NULL, can0_clk) |
| 658 | _REGISTER_CLOCK("flexcan.1", NULL, can1_clk) |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 659 | _REGISTER_CLOCK(NULL, "usb0", usb0_clk) |
| 660 | _REGISTER_CLOCK(NULL, "usb1", usb1_clk) |
Sascha Hauer | 2301dfa | 2011-01-25 11:58:15 +0100 | [diff] [blame] | 661 | _REGISTER_CLOCK("mxs-pwm.0", NULL, pwm_clk) |
| 662 | _REGISTER_CLOCK("mxs-pwm.1", NULL, pwm_clk) |
| 663 | _REGISTER_CLOCK("mxs-pwm.2", NULL, pwm_clk) |
| 664 | _REGISTER_CLOCK("mxs-pwm.3", NULL, pwm_clk) |
| 665 | _REGISTER_CLOCK("mxs-pwm.4", NULL, pwm_clk) |
| 666 | _REGISTER_CLOCK("mxs-pwm.5", NULL, pwm_clk) |
| 667 | _REGISTER_CLOCK("mxs-pwm.6", NULL, pwm_clk) |
| 668 | _REGISTER_CLOCK("mxs-pwm.7", NULL, pwm_clk) |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 669 | _REGISTER_CLOCK(NULL, "lradc", lradc_clk) |
| 670 | _REGISTER_CLOCK(NULL, "spdif", spdif_clk) |
Sascha Hauer | 2e8fd69 | 2011-01-14 15:32:49 +0100 | [diff] [blame] | 671 | _REGISTER_CLOCK("imx28-fb", NULL, lcdif_clk) |
Dong Aisheng | cf66ea8 | 2011-07-20 11:41:41 +0800 | [diff] [blame] | 672 | _REGISTER_CLOCK("mxs-saif.0", NULL, saif0_clk) |
| 673 | _REGISTER_CLOCK("mxs-saif.1", NULL, saif1_clk) |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 674 | }; |
| 675 | |
| 676 | static int clk_misc_init(void) |
| 677 | { |
| 678 | u32 reg; |
| 679 | int i; |
| 680 | |
| 681 | /* Fix up parent per register setting */ |
| 682 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_CLKSEQ); |
| 683 | cpu_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_CPU) ? |
| 684 | &ref_xtal_clk : &ref_cpu_clk; |
| 685 | emi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_EMI) ? |
| 686 | &ref_xtal_clk : &ref_emi_clk; |
| 687 | ssp0_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP0) ? |
| 688 | &ref_xtal_clk : &ref_io0_clk; |
| 689 | ssp1_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP1) ? |
| 690 | &ref_xtal_clk : &ref_io0_clk; |
| 691 | ssp2_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP2) ? |
| 692 | &ref_xtal_clk : &ref_io1_clk; |
| 693 | ssp3_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP3) ? |
| 694 | &ref_xtal_clk : &ref_io1_clk; |
| 695 | lcdif_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_DIS_LCDIF) ? |
| 696 | &ref_xtal_clk : &ref_pix_clk; |
| 697 | gpmi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_GPMI) ? |
| 698 | &ref_xtal_clk : &ref_gpmi_clk; |
| 699 | saif0_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SAIF0) ? |
| 700 | &ref_xtal_clk : &pll0_clk; |
| 701 | saif1_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SAIF1) ? |
| 702 | &ref_xtal_clk : &pll0_clk; |
| 703 | |
| 704 | /* Use int div over frac when both are available */ |
| 705 | __raw_writel(BM_CLKCTRL_CPU_DIV_XTAL_FRAC_EN, |
| 706 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_CLR); |
| 707 | __raw_writel(BM_CLKCTRL_CPU_DIV_CPU_FRAC_EN, |
| 708 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_CLR); |
| 709 | __raw_writel(BM_CLKCTRL_HBUS_DIV_FRAC_EN, |
| 710 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS_CLR); |
| 711 | |
| 712 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_XBUS); |
| 713 | reg &= ~BM_CLKCTRL_XBUS_DIV_FRAC_EN; |
| 714 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_XBUS); |
| 715 | |
| 716 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP0); |
| 717 | reg &= ~BM_CLKCTRL_SSP0_DIV_FRAC_EN; |
| 718 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP0); |
| 719 | |
| 720 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP1); |
| 721 | reg &= ~BM_CLKCTRL_SSP1_DIV_FRAC_EN; |
| 722 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP1); |
| 723 | |
| 724 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP2); |
| 725 | reg &= ~BM_CLKCTRL_SSP2_DIV_FRAC_EN; |
| 726 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP2); |
| 727 | |
| 728 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP3); |
| 729 | reg &= ~BM_CLKCTRL_SSP3_DIV_FRAC_EN; |
| 730 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP3); |
| 731 | |
| 732 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_GPMI); |
| 733 | reg &= ~BM_CLKCTRL_GPMI_DIV_FRAC_EN; |
| 734 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_GPMI); |
| 735 | |
| 736 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_DIS_LCDIF); |
| 737 | reg &= ~BM_CLKCTRL_DIS_LCDIF_DIV_FRAC_EN; |
| 738 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_DIS_LCDIF); |
| 739 | |
| 740 | /* SAIF has to use frac div for functional operation */ |
| 741 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF0); |
Dong Aisheng | b00d533 | 2011-07-20 11:41:45 +0800 | [diff] [blame] | 742 | reg |= BM_CLKCTRL_SAIF0_DIV_FRAC_EN; |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 743 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF0); |
| 744 | |
| 745 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF1); |
Dong Aisheng | b00d533 | 2011-07-20 11:41:45 +0800 | [diff] [blame] | 746 | reg |= BM_CLKCTRL_SAIF1_DIV_FRAC_EN; |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 747 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF1); |
| 748 | |
| 749 | /* |
| 750 | * Set safe hbus clock divider. A divider of 3 ensure that |
| 751 | * the Vddd voltage required for the cpu clock is sufficiently |
| 752 | * high for the hbus clock. |
| 753 | */ |
| 754 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS); |
| 755 | reg &= BM_CLKCTRL_HBUS_DIV; |
| 756 | reg |= 3 << BP_CLKCTRL_HBUS_DIV; |
| 757 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS); |
| 758 | |
| 759 | for (i = 10000; i; i--) |
| 760 | if (!(__raw_readl(CLKCTRL_BASE_ADDR + |
| 761 | HW_CLKCTRL_HBUS) & BM_CLKCTRL_HBUS_ASM_BUSY)) |
| 762 | break; |
| 763 | if (!i) { |
| 764 | pr_err("%s: divider writing timeout\n", __func__); |
| 765 | return -ETIMEDOUT; |
| 766 | } |
| 767 | |
| 768 | /* Gate off cpu clock in WFI for power saving */ |
| 769 | __raw_writel(BM_CLKCTRL_CPU_INTERRUPT_WAIT, |
| 770 | CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_SET); |
| 771 | |
Stefano Babic | ea42a0d | 2011-09-07 08:45:31 +0200 | [diff] [blame] | 772 | /* |
| 773 | * Extra fec clock setting |
| 774 | * The DENX M28 uses an external clock source |
| 775 | * and the clock output must not be enabled |
| 776 | */ |
| 777 | if (!machine_is_m28evk()) { |
| 778 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET); |
| 779 | reg &= ~BM_CLKCTRL_ENET_SLEEP; |
| 780 | reg |= BM_CLKCTRL_ENET_CLK_OUT_EN; |
| 781 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET); |
| 782 | } |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 783 | |
Shawn Guo | 47babe6 | 2011-03-16 11:31:06 +0100 | [diff] [blame] | 784 | /* |
| 785 | * 480 MHz seems too high to be ssp clock source directly, |
| 786 | * so set frac0 to get a 288 MHz ref_io0. |
| 787 | */ |
| 788 | reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC0); |
| 789 | reg &= ~BM_CLKCTRL_FRAC0_IO0FRAC; |
| 790 | reg |= 30 << BP_CLKCTRL_FRAC0_IO0FRAC; |
| 791 | __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC0); |
| 792 | |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | int __init mx28_clocks_init(void) |
| 797 | { |
| 798 | clk_misc_init(); |
| 799 | |
Shawn Guo | 47babe6 | 2011-03-16 11:31:06 +0100 | [diff] [blame] | 800 | /* |
| 801 | * source ssp clock from ref_io0 than ref_xtal, |
| 802 | * as ref_xtal only provides 24 MHz as maximum. |
| 803 | */ |
| 804 | clk_set_parent(&ssp0_clk, &ref_io0_clk); |
| 805 | clk_set_parent(&ssp1_clk, &ref_io0_clk); |
| 806 | |
Shawn Guo | ae68f7a | 2011-12-20 13:50:11 +0800 | [diff] [blame] | 807 | clk_prepare_enable(&cpu_clk); |
| 808 | clk_prepare_enable(&hbus_clk); |
| 809 | clk_prepare_enable(&xbus_clk); |
| 810 | clk_prepare_enable(&emi_clk); |
| 811 | clk_prepare_enable(&uart_clk); |
Shawn Guo | dbc4245 | 2011-01-04 14:20:52 +0800 | [diff] [blame] | 812 | |
Shawn Guo | 12b90f8 | 2011-03-08 18:51:09 +0800 | [diff] [blame] | 813 | clk_set_parent(&lcdif_clk, &ref_pix_clk); |
Dong Aisheng | cf66ea8 | 2011-07-20 11:41:41 +0800 | [diff] [blame] | 814 | clk_set_parent(&saif0_clk, &pll0_clk); |
| 815 | clk_set_parent(&saif1_clk, &pll0_clk); |
Shawn Guo | 12b90f8 | 2011-03-08 18:51:09 +0800 | [diff] [blame] | 816 | |
Dong Aisheng | b07fed4 | 2011-11-22 23:54:25 +0800 | [diff] [blame] | 817 | /* |
| 818 | * Set an initial clock rate for the saif internal logic to work |
| 819 | * properly. This is important when working in EXTMASTER mode that |
| 820 | * uses the other saif's BITCLK&LRCLK but it still needs a basic |
| 821 | * clock which should be fast enough for the internal logic. |
| 822 | */ |
| 823 | clk_set_rate(&saif0_clk, 24000000); |
| 824 | clk_set_rate(&saif1_clk, 24000000); |
| 825 | |
Shawn Guo | 30a7585 | 2010-12-18 21:39:33 +0800 | [diff] [blame] | 826 | clkdev_add_table(lookups, ARRAY_SIZE(lookups)); |
| 827 | |
| 828 | mxs_timer_init(&clk32k_clk, MX28_INT_TIMER0); |
| 829 | |
| 830 | return 0; |
| 831 | } |