1 /* 2 * (C) Copyright 2007 3 * Sascha Hauer, Pengutronix 4 * 5 * (C) Copyright 2008-2010 Freescale Semiconductor, Inc. 6 * 7 * See file CREDITS for list of people who contributed to this 8 * project. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of 13 * the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 23 * MA 02111-1307 USA 24 */ 25 26 #include <common.h> 27 #include <asm/io.h> 28 #include <asm/errno.h> 29 #include <asm/arch/imx-regs.h> 30 #include <asm/arch/crm_regs.h> 31 #include <asm/arch/clock.h> 32 #include <asm/arch/sys_proto.h> 33 #include <netdev.h> 34 35 #define CLK_CODE(arm, ahb, sel) (((arm) << 16) + ((ahb) << 8) + (sel)) 36 #define CLK_CODE_ARM(c) (((c) >> 16) & 0xFF) 37 #define CLK_CODE_AHB(c) (((c) >> 8) & 0xFF) 38 #define CLK_CODE_PATH(c) ((c) & 0xFF) 39 40 #define CCM_GET_DIVIDER(x, m, o) (((x) & (m)) >> (o)) 41 42 #ifdef CONFIG_FSL_ESDHC 43 DECLARE_GLOBAL_DATA_PTR; 44 #endif 45 46 static int g_clk_mux_auto[8] = { 47 CLK_CODE(1, 3, 0), CLK_CODE(1, 2, 1), CLK_CODE(2, 1, 1), -1, 48 CLK_CODE(1, 6, 0), CLK_CODE(1, 4, 1), CLK_CODE(2, 2, 1), -1, 49 }; 50 51 static int g_clk_mux_consumer[16] = { 52 CLK_CODE(1, 4, 0), CLK_CODE(1, 3, 1), CLK_CODE(1, 3, 1), -1, 53 -1, -1, CLK_CODE(4, 1, 0), CLK_CODE(1, 5, 0), 54 CLK_CODE(1, 8, 1), CLK_CODE(1, 6, 1), CLK_CODE(2, 4, 0), -1, 55 -1, -1, CLK_CODE(4, 2, 0), -1, 56 }; 57 58 static int hsp_div_table[3][16] = { 59 {4, 3, 2, -1, -1, -1, 1, 5, 4, 3, 2, -1, -1, -1, 1, -1}, 60 {-1, -1, -1, -1, -1, -1, -1, -1, 8, 6, 4, -1, -1, -1, 2, -1}, 61 {3, -1, -1, -1, -1, -1, -1, -1, 3, -1, -1, -1, -1, -1, -1, -1}, 62 }; 63 64 u32 get_cpu_rev(void) 65 { 66 int reg; 67 struct iim_regs *iim = 68 (struct iim_regs *)IIM_BASE_ADDR; 69 reg = readl(&iim->iim_srev); 70 if (!reg) { 71 reg = readw(ROMPATCH_REV); 72 reg <<= 4; 73 } else { 74 reg += CHIP_REV_1_0; 75 } 76 77 return 0x35000 + (reg & 0xFF); 78 } 79 80 static u32 get_arm_div(u32 pdr0, u32 *fi, u32 *fd) 81 { 82 int *pclk_mux; 83 if (pdr0 & MXC_CCM_PDR0_AUTO_CON) { 84 pclk_mux = g_clk_mux_consumer + 85 ((pdr0 & MXC_CCM_PDR0_CON_MUX_DIV_MASK) >> 86 MXC_CCM_PDR0_CON_MUX_DIV_OFFSET); 87 } else { 88 pclk_mux = g_clk_mux_auto + 89 ((pdr0 & MXC_CCM_PDR0_AUTO_MUX_DIV_MASK) >> 90 MXC_CCM_PDR0_AUTO_MUX_DIV_OFFSET); 91 } 92 93 if ((*pclk_mux) == -1) 94 return -1; 95 96 if (fi && fd) { 97 if (!CLK_CODE_PATH(*pclk_mux)) { 98 *fi = *fd = 1; 99 return CLK_CODE_ARM(*pclk_mux); 100 } 101 if (pdr0 & MXC_CCM_PDR0_AUTO_CON) { 102 *fi = 3; 103 *fd = 4; 104 } else { 105 *fi = 2; 106 *fd = 3; 107 } 108 } 109 return CLK_CODE_ARM(*pclk_mux); 110 } 111 112 static int get_ahb_div(u32 pdr0) 113 { 114 int *pclk_mux; 115 116 pclk_mux = g_clk_mux_consumer + 117 ((pdr0 & MXC_CCM_PDR0_CON_MUX_DIV_MASK) >> 118 MXC_CCM_PDR0_CON_MUX_DIV_OFFSET); 119 120 if ((*pclk_mux) == -1) 121 return -1; 122 123 return CLK_CODE_AHB(*pclk_mux); 124 } 125 126 static u32 decode_pll(u32 reg, u32 infreq) 127 { 128 u32 mfi = (reg >> 10) & 0xf; 129 u32 mfn = reg & 0x3f; 130 u32 mfd = (reg >> 16) & 0x3f; 131 u32 pd = (reg >> 26) & 0xf; 132 133 mfi = mfi <= 5 ? 5 : mfi; 134 mfd += 1; 135 pd += 1; 136 137 return ((2 * (infreq / 1000) * (mfi * mfd + mfn)) / (mfd * pd)) * 1000; 138 } 139 140 static u32 get_mcu_main_clk(void) 141 { 142 u32 arm_div = 0, fi = 0, fd = 0; 143 struct ccm_regs *ccm = 144 (struct ccm_regs *)IMX_CCM_BASE; 145 arm_div = get_arm_div(readl(&ccm->pdr0), &fi, &fd); 146 fi *= 147 decode_pll(readl(&ccm->mpctl), 148 CONFIG_MX35_HCLK_FREQ); 149 return fi / (arm_div * fd); 150 } 151 152 static u32 get_ipg_clk(void) 153 { 154 u32 freq = get_mcu_main_clk(); 155 struct ccm_regs *ccm = 156 (struct ccm_regs *)IMX_CCM_BASE; 157 u32 pdr0 = readl(&ccm->pdr0); 158 159 return freq / (get_ahb_div(pdr0) * 2); 160 } 161 162 static u32 get_ipg_per_clk(void) 163 { 164 u32 freq = get_mcu_main_clk(); 165 struct ccm_regs *ccm = 166 (struct ccm_regs *)IMX_CCM_BASE; 167 u32 pdr0 = readl(&ccm->pdr0); 168 u32 pdr4 = readl(&ccm->pdr4); 169 u32 div; 170 if (pdr0 & MXC_CCM_PDR0_PER_SEL) { 171 div = (CCM_GET_DIVIDER(pdr4, 172 MXC_CCM_PDR4_PER0_PRDF_MASK, 173 MXC_CCM_PDR4_PER0_PODF_OFFSET) + 1) * 174 (CCM_GET_DIVIDER(pdr4, 175 MXC_CCM_PDR4_PER0_PODF_MASK, 176 MXC_CCM_PDR4_PER0_PODF_OFFSET) + 1); 177 } else { 178 div = CCM_GET_DIVIDER(pdr0, 179 MXC_CCM_PDR0_PER_PODF_MASK, 180 MXC_CCM_PDR0_PER_PODF_OFFSET) + 1; 181 freq /= get_ahb_div(pdr0); 182 } 183 return freq / div; 184 } 185 186 u32 imx_get_uartclk(void) 187 { 188 u32 freq; 189 struct ccm_regs *ccm = 190 (struct ccm_regs *)IMX_CCM_BASE; 191 u32 pdr4 = readl(&ccm->pdr4); 192 193 if (readl(&ccm->pdr3) & MXC_CCM_PDR3_UART_M_U) { 194 freq = get_mcu_main_clk(); 195 } else { 196 freq = decode_pll(readl(&ccm->ppctl), 197 CONFIG_MX35_HCLK_FREQ); 198 } 199 freq /= ((CCM_GET_DIVIDER(pdr4, 200 MXC_CCM_PDR4_UART_PRDF_MASK, 201 MXC_CCM_PDR4_UART_PRDF_OFFSET) + 1) * 202 (CCM_GET_DIVIDER(pdr4, 203 MXC_CCM_PDR4_UART_PODF_MASK, 204 MXC_CCM_PDR4_UART_PODF_OFFSET) + 1)); 205 return freq; 206 } 207 208 unsigned int mxc_get_main_clock(enum mxc_main_clocks clk) 209 { 210 u32 nfc_pdf, hsp_podf; 211 u32 pll, ret_val = 0, usb_prdf, usb_podf; 212 struct ccm_regs *ccm = 213 (struct ccm_regs *)IMX_CCM_BASE; 214 215 u32 reg = readl(&ccm->pdr0); 216 u32 reg4 = readl(&ccm->pdr4); 217 218 reg |= 0x1; 219 220 switch (clk) { 221 case CPU_CLK: 222 ret_val = get_mcu_main_clk(); 223 break; 224 case AHB_CLK: 225 ret_val = get_mcu_main_clk(); 226 break; 227 case HSP_CLK: 228 if (reg & CLKMODE_CONSUMER) { 229 hsp_podf = (reg >> 20) & 0x3; 230 pll = get_mcu_main_clk(); 231 hsp_podf = hsp_div_table[hsp_podf][(reg>>16)&0xF]; 232 if (hsp_podf > 0) { 233 ret_val = pll / hsp_podf; 234 } else { 235 puts("mismatch HSP with ARM clock setting\n"); 236 ret_val = 0; 237 } 238 } else { 239 ret_val = get_mcu_main_clk(); 240 } 241 break; 242 case IPG_CLK: 243 ret_val = get_ipg_clk(); 244 break; 245 case IPG_PER_CLK: 246 ret_val = get_ipg_per_clk(); 247 break; 248 case NFC_CLK: 249 nfc_pdf = (reg4 >> 28) & 0xF; 250 pll = get_mcu_main_clk(); 251 /* AHB/nfc_pdf */ 252 ret_val = pll / (nfc_pdf + 1); 253 break; 254 case USB_CLK: 255 usb_prdf = (reg4 >> 25) & 0x7; 256 usb_podf = (reg4 >> 22) & 0x7; 257 if (reg4 & 0x200) { 258 pll = get_mcu_main_clk(); 259 } else { 260 pll = decode_pll(readl(&ccm->ppctl), 261 CONFIG_MX35_HCLK_FREQ); 262 } 263 264 ret_val = pll / ((usb_prdf + 1) * (usb_podf + 1)); 265 break; 266 default: 267 printf("Unknown clock: %d\n", clk); 268 break; 269 } 270 271 return ret_val; 272 } 273 unsigned int mxc_get_peri_clock(enum mxc_peri_clocks clk) 274 { 275 u32 ret_val = 0, pdf, pre_pdf, clk_sel; 276 struct ccm_regs *ccm = 277 (struct ccm_regs *)IMX_CCM_BASE; 278 u32 mpdr2 = readl(&ccm->pdr2); 279 u32 mpdr3 = readl(&ccm->pdr3); 280 u32 mpdr4 = readl(&ccm->pdr4); 281 282 switch (clk) { 283 case UART1_BAUD: 284 case UART2_BAUD: 285 case UART3_BAUD: 286 clk_sel = mpdr3 & (1 << 14); 287 pre_pdf = (mpdr4 >> 13) & 0x7; 288 pdf = (mpdr4 >> 10) & 0x7; 289 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 290 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 291 ((pre_pdf + 1) * (pdf + 1)); 292 break; 293 case SSI1_BAUD: 294 pre_pdf = (mpdr2 >> 24) & 0x7; 295 pdf = mpdr2 & 0x3F; 296 clk_sel = mpdr2 & (1 << 6); 297 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 298 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 299 ((pre_pdf + 1) * (pdf + 1)); 300 break; 301 case SSI2_BAUD: 302 pre_pdf = (mpdr2 >> 27) & 0x7; 303 pdf = (mpdr2 >> 8) & 0x3F; 304 clk_sel = mpdr2 & (1 << 6); 305 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 306 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 307 ((pre_pdf + 1) * (pdf + 1)); 308 break; 309 case CSI_BAUD: 310 clk_sel = mpdr2 & (1 << 7); 311 pre_pdf = (mpdr2 >> 16) & 0x7; 312 pdf = (mpdr2 >> 19) & 0x7; 313 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 314 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 315 ((pre_pdf + 1) * (pdf + 1)); 316 break; 317 case MSHC_CLK: 318 pre_pdf = readl(&ccm->pdr1); 319 clk_sel = (pre_pdf & 0x80); 320 pdf = (pre_pdf >> 22) & 0x3F; 321 pre_pdf = (pre_pdf >> 28) & 0x7; 322 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 323 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 324 ((pre_pdf + 1) * (pdf + 1)); 325 break; 326 case ESDHC1_CLK: 327 clk_sel = mpdr3 & 0x40; 328 pre_pdf = mpdr3 & 0x7; 329 pdf = (mpdr3>>3) & 0x7; 330 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 331 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 332 ((pre_pdf + 1) * (pdf + 1)); 333 break; 334 case ESDHC2_CLK: 335 clk_sel = mpdr3 & 0x40; 336 pre_pdf = (mpdr3 >> 8) & 0x7; 337 pdf = (mpdr3 >> 11) & 0x7; 338 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 339 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 340 ((pre_pdf + 1) * (pdf + 1)); 341 break; 342 case ESDHC3_CLK: 343 clk_sel = mpdr3 & 0x40; 344 pre_pdf = (mpdr3 >> 16) & 0x7; 345 pdf = (mpdr3 >> 19) & 0x7; 346 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 347 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 348 ((pre_pdf + 1) * (pdf + 1)); 349 break; 350 case SPDIF_CLK: 351 clk_sel = mpdr3 & 0x400000; 352 pre_pdf = (mpdr3 >> 29) & 0x7; 353 pdf = (mpdr3 >> 23) & 0x3F; 354 ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) : 355 decode_pll(readl(&ccm->ppctl), CONFIG_MX35_HCLK_FREQ)) / 356 ((pre_pdf + 1) * (pdf + 1)); 357 break; 358 default: 359 printf("%s(): This clock: %d not supported yet\n", 360 __func__, clk); 361 break; 362 } 363 364 return ret_val; 365 } 366 367 unsigned int mxc_get_clock(enum mxc_clock clk) 368 { 369 switch (clk) { 370 case MXC_ARM_CLK: 371 return get_mcu_main_clk(); 372 case MXC_AHB_CLK: 373 break; 374 case MXC_IPG_CLK: 375 return get_ipg_clk(); 376 case MXC_IPG_PERCLK: 377 return get_ipg_per_clk(); 378 case MXC_UART_CLK: 379 return imx_get_uartclk(); 380 case MXC_ESDHC_CLK: 381 return mxc_get_peri_clock(ESDHC1_CLK); 382 case MXC_USB_CLK: 383 return mxc_get_main_clock(USB_CLK); 384 case MXC_FEC_CLK: 385 return get_ipg_clk(); 386 case MXC_CSPI_CLK: 387 return get_ipg_clk(); 388 } 389 return -1; 390 } 391 392 #ifdef CONFIG_FEC_MXC 393 /* 394 * The MX35 has no fuse for MAC, return a NULL MAC 395 */ 396 void imx_get_mac_from_fuse(unsigned char *mac) 397 { 398 memset(mac, 0, 6); 399 } 400 401 u32 imx_get_fecclk(void) 402 { 403 return mxc_get_clock(MXC_IPG_CLK); 404 } 405 #endif 406 407 int do_mx35_showclocks(cmd_tbl_t *cmdtp, 408 int flag, int argc, char * const argv[]) 409 { 410 u32 cpufreq = get_mcu_main_clk(); 411 printf("mx35 cpu clock: %dMHz\n", cpufreq / 1000000); 412 printf("ipg clock : %dHz\n", get_ipg_clk()); 413 printf("ipg per clock : %dHz\n", get_ipg_per_clk()); 414 printf("uart clock : %dHz\n", mxc_get_clock(MXC_UART_CLK)); 415 416 return 0; 417 } 418 419 U_BOOT_CMD( 420 clocks, CONFIG_SYS_MAXARGS, 1, do_mx35_showclocks, 421 "display clocks", 422 "" 423 ); 424 425 static char *get_reset_cause(void) 426 { 427 /* read RCSR register from CCM module */ 428 struct ccm_regs *ccm = 429 (struct ccm_regs *)IMX_CCM_BASE; 430 431 u32 cause = readl(&ccm->rcsr) & 0x0F; 432 433 switch (cause) { 434 case 0x0000: 435 return "POR"; 436 case 0x0002: 437 return "JTAG"; 438 case 0x0004: 439 return "RST"; 440 case 0x0008: 441 return "WDOG"; 442 default: 443 return "unknown reset"; 444 } 445 } 446 447 #if defined(CONFIG_DISPLAY_CPUINFO) 448 int print_cpuinfo(void) 449 { 450 u32 srev = get_cpu_rev(); 451 452 printf("CPU: Freescale i.MX35 rev %d.%d at %d MHz.\n", 453 (srev & 0xF0) >> 4, (srev & 0x0F), 454 get_mcu_main_clk() / 1000000); 455 456 printf("Reset cause: %s\n", get_reset_cause()); 457 458 return 0; 459 } 460 #endif 461 462 /* 463 * Initializes on-chip ethernet controllers. 464 * to override, implement board_eth_init() 465 */ 466 467 int cpu_eth_init(bd_t *bis) 468 { 469 int rc = -ENODEV; 470 471 #if defined(CONFIG_FEC_MXC) 472 rc = fecmxc_initialize(bis); 473 #endif 474 475 return rc; 476 } 477 478 int get_clocks(void) 479 { 480 #ifdef CONFIG_FSL_ESDHC 481 gd->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK); 482 #endif 483 return 0; 484 } 485 486 void reset_cpu(ulong addr) 487 { 488 struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR; 489 writew(4, &wdog->wcr); 490 } 491