1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OMAP3xxx PRM module functions 4 * 5 * Copyright (C) 2010-2012 Texas Instruments, Inc. 6 * Copyright (C) 2010 Nokia Corporation 7 * Benoît Cousson 8 * Paul Walmsley 9 * Rajendra Nayak <rnayak@ti.com> 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/errno.h> 14 #include <linux/err.h> 15 #include <linux/io.h> 16 #include <linux/irq.h> 17 #include <linux/of_irq.h> 18 19 #include "soc.h" 20 #include "common.h" 21 #include "vp.h" 22 #include "powerdomain.h" 23 #include "prm3xxx.h" 24 #include "prm2xxx_3xxx.h" 25 #include "cm2xxx_3xxx.h" 26 #include "prm-regbits-34xx.h" 27 #include "cm3xxx.h" 28 #include "cm-regbits-34xx.h" 29 #include "clock.h" 30 31 static void omap3xxx_prm_read_pending_irqs(unsigned long *events); 32 static void omap3xxx_prm_ocp_barrier(void); 33 static void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask); 34 static void omap3xxx_prm_restore_irqen(u32 *saved_mask); 35 36 static const struct omap_prcm_irq omap3_prcm_irqs[] = { 37 OMAP_PRCM_IRQ("wkup", 0, 0), 38 OMAP_PRCM_IRQ("io", 9, 1), 39 }; 40 41 static struct omap_prcm_irq_setup omap3_prcm_irq_setup = { 42 .ack = OMAP3_PRM_IRQSTATUS_MPU_OFFSET, 43 .mask = OMAP3_PRM_IRQENABLE_MPU_OFFSET, 44 .nr_regs = 1, 45 .irqs = omap3_prcm_irqs, 46 .nr_irqs = ARRAY_SIZE(omap3_prcm_irqs), 47 .irq = 11 + OMAP_INTC_START, 48 .read_pending_irqs = &omap3xxx_prm_read_pending_irqs, 49 .ocp_barrier = &omap3xxx_prm_ocp_barrier, 50 .save_and_clear_irqen = &omap3xxx_prm_save_and_clear_irqen, 51 .restore_irqen = &omap3xxx_prm_restore_irqen, 52 .reconfigure_io_chain = NULL, 53 }; 54 55 /* 56 * omap3_prm_reset_src_map - map from bits in the PRM_RSTST hardware 57 * register (which are specific to OMAP3xxx SoCs) to reset source ID 58 * bit shifts (which is an OMAP SoC-independent enumeration) 59 */ 60 static struct prm_reset_src_map omap3xxx_prm_reset_src_map[] = { 61 { OMAP3430_GLOBAL_COLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT }, 62 { OMAP3430_GLOBAL_SW_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT }, 63 { OMAP3430_SECURITY_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT }, 64 { OMAP3430_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT }, 65 { OMAP3430_SECURE_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT }, 66 { OMAP3430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT }, 67 { OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT, 68 OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT }, 69 { OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT, 70 OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT }, 71 { OMAP3430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT }, 72 { OMAP3430_ICECRUSHER_RST_SHIFT, OMAP_ICECRUSHER_RST_SRC_ID_SHIFT }, 73 { -1, -1 }, 74 }; 75 76 /* PRM VP */ 77 78 /* 79 * struct omap3_vp - OMAP3 VP register access description. 80 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg 81 */ 82 struct omap3_vp { 83 u32 tranxdone_status; 84 }; 85 86 static struct omap3_vp omap3_vp[] = { 87 [OMAP3_VP_VDD_MPU_ID] = { 88 .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK, 89 }, 90 [OMAP3_VP_VDD_CORE_ID] = { 91 .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK, 92 }, 93 }; 94 95 #define MAX_VP_ID ARRAY_SIZE(omap3_vp); 96 97 static u32 omap3_prm_vp_check_txdone(u8 vp_id) 98 { 99 struct omap3_vp *vp = &omap3_vp[vp_id]; 100 u32 irqstatus; 101 102 irqstatus = omap2_prm_read_mod_reg(OCP_MOD, 103 OMAP3_PRM_IRQSTATUS_MPU_OFFSET); 104 return irqstatus & vp->tranxdone_status; 105 } 106 107 static void omap3_prm_vp_clear_txdone(u8 vp_id) 108 { 109 struct omap3_vp *vp = &omap3_vp[vp_id]; 110 111 omap2_prm_write_mod_reg(vp->tranxdone_status, 112 OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); 113 } 114 115 u32 omap3_prm_vcvp_read(u8 offset) 116 { 117 return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, offset); 118 } 119 120 void omap3_prm_vcvp_write(u32 val, u8 offset) 121 { 122 omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, offset); 123 } 124 125 u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset) 126 { 127 return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, offset); 128 } 129 130 /** 131 * omap3xxx_prm_dpll3_reset - use DPLL3 reset to reboot the OMAP SoC 132 * 133 * Set the DPLL3 reset bit, which should reboot the SoC. This is the 134 * recommended way to restart the SoC, considering Errata i520. No 135 * return value. 136 */ 137 static void omap3xxx_prm_dpll3_reset(void) 138 { 139 omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, OMAP3430_GR_MOD, 140 OMAP2_RM_RSTCTRL); 141 /* OCP barrier */ 142 omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL); 143 } 144 145 /** 146 * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events 147 * @events: ptr to a u32, preallocated by caller 148 * 149 * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM 150 * MPU IRQs, and store the result into the u32 pointed to by @events. 151 * No return value. 152 */ 153 static void omap3xxx_prm_read_pending_irqs(unsigned long *events) 154 { 155 u32 mask, st; 156 157 /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */ 158 mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET); 159 st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); 160 161 events[0] = mask & st; 162 } 163 164 /** 165 * omap3xxx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete 166 * 167 * Force any buffered writes to the PRM IP block to complete. Needed 168 * by the PRM IRQ handler, which reads and writes directly to the IP 169 * block, to avoid race conditions after acknowledging or clearing IRQ 170 * bits. No return value. 171 */ 172 static void omap3xxx_prm_ocp_barrier(void) 173 { 174 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET); 175 } 176 177 /** 178 * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg 179 * @saved_mask: ptr to a u32 array to save IRQENABLE bits 180 * 181 * Save the PRM_IRQENABLE_MPU register to @saved_mask. @saved_mask 182 * must be allocated by the caller. Intended to be used in the PRM 183 * interrupt handler suspend callback. The OCP barrier is needed to 184 * ensure the write to disable PRM interrupts reaches the PRM before 185 * returning; otherwise, spurious interrupts might occur. No return 186 * value. 187 */ 188 static void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask) 189 { 190 saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD, 191 OMAP3_PRM_IRQENABLE_MPU_OFFSET); 192 omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET); 193 194 /* OCP barrier */ 195 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET); 196 } 197 198 /** 199 * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args 200 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously 201 * 202 * Restore the PRM_IRQENABLE_MPU register from @saved_mask. Intended 203 * to be used in the PRM interrupt handler resume callback to restore 204 * values saved by omap3xxx_prm_save_and_clear_irqen(). No OCP 205 * barrier should be needed here; any pending PRM interrupts will fire 206 * once the writes reach the PRM. No return value. 207 */ 208 static void omap3xxx_prm_restore_irqen(u32 *saved_mask) 209 { 210 omap2_prm_write_mod_reg(saved_mask[0], OCP_MOD, 211 OMAP3_PRM_IRQENABLE_MPU_OFFSET); 212 } 213 214 /** 215 * omap3xxx_prm_clear_mod_irqs - clear wake-up events from PRCM interrupt 216 * @module: PRM module to clear wakeups from 217 * @regs: register set to clear, 1 or 3 218 * @wkst_mask: wkst bits to clear 219 * 220 * The purpose of this function is to clear any wake-up events latched 221 * in the PRCM PM_WKST_x registers. It is possible that a wake-up event 222 * may occur whilst attempting to clear a PM_WKST_x register and thus 223 * set another bit in this register. A while loop is used to ensure 224 * that any peripheral wake-up events occurring while attempting to 225 * clear the PM_WKST_x are detected and cleared. 226 */ 227 static int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 wkst_mask) 228 { 229 u32 wkst, fclk, iclk, clken; 230 u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1; 231 u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1; 232 u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1; 233 u16 grpsel_off = (regs == 3) ? 234 OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL; 235 int c = 0; 236 237 wkst = omap2_prm_read_mod_reg(module, wkst_off); 238 wkst &= omap2_prm_read_mod_reg(module, grpsel_off); 239 wkst &= wkst_mask; 240 if (wkst) { 241 iclk = omap2_cm_read_mod_reg(module, iclk_off); 242 fclk = omap2_cm_read_mod_reg(module, fclk_off); 243 while (wkst) { 244 clken = wkst; 245 omap2_cm_set_mod_reg_bits(clken, module, iclk_off); 246 /* 247 * For USBHOST, we don't know whether HOST1 or 248 * HOST2 woke us up, so enable both f-clocks 249 */ 250 if (module == OMAP3430ES2_USBHOST_MOD) 251 clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT; 252 omap2_cm_set_mod_reg_bits(clken, module, fclk_off); 253 omap2_prm_write_mod_reg(wkst, module, wkst_off); 254 wkst = omap2_prm_read_mod_reg(module, wkst_off); 255 wkst &= wkst_mask; 256 c++; 257 } 258 omap2_cm_write_mod_reg(iclk, module, iclk_off); 259 omap2_cm_write_mod_reg(fclk, module, fclk_off); 260 } 261 262 return c; 263 } 264 265 /** 266 * omap3_prm_reset_modem - toggle reset signal for modem 267 * 268 * Toggles the reset signal to modem IP block. Required to allow 269 * OMAP3430 without stacked modem to idle properly. 270 */ 271 void __init omap3_prm_reset_modem(void) 272 { 273 omap2_prm_write_mod_reg( 274 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK | 275 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK, 276 CORE_MOD, OMAP2_RM_RSTCTRL); 277 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL); 278 } 279 280 /** 281 * omap3_prm_init_pm - initialize PM related registers for PRM 282 * @has_uart4: SoC has UART4 283 * @has_iva: SoC has IVA 284 * 285 * Initializes PRM registers for PM use. Called from PM init. 286 */ 287 void __init omap3_prm_init_pm(bool has_uart4, bool has_iva) 288 { 289 u32 en_uart4_mask; 290 u32 grpsel_uart4_mask; 291 292 /* 293 * Enable control of expternal oscillator through 294 * sys_clkreq. In the long run clock framework should 295 * take care of this. 296 */ 297 omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK, 298 1 << OMAP_AUTOEXTCLKMODE_SHIFT, 299 OMAP3430_GR_MOD, 300 OMAP3_PRM_CLKSRC_CTRL_OFFSET); 301 302 /* setup wakup source */ 303 omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK | 304 OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK, 305 WKUP_MOD, PM_WKEN); 306 /* No need to write EN_IO, that is always enabled */ 307 omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK | 308 OMAP3430_GRPSEL_GPT1_MASK | 309 OMAP3430_GRPSEL_GPT12_MASK, 310 WKUP_MOD, OMAP3430_PM_MPUGRPSEL); 311 312 /* Enable PM_WKEN to support DSS LPR */ 313 omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK, 314 OMAP3430_DSS_MOD, PM_WKEN); 315 316 if (has_uart4) { 317 en_uart4_mask = OMAP3630_EN_UART4_MASK; 318 grpsel_uart4_mask = OMAP3630_GRPSEL_UART4_MASK; 319 } else { 320 en_uart4_mask = 0; 321 grpsel_uart4_mask = 0; 322 } 323 324 /* Enable wakeups in PER */ 325 omap2_prm_write_mod_reg(en_uart4_mask | 326 OMAP3430_EN_GPIO2_MASK | 327 OMAP3430_EN_GPIO3_MASK | 328 OMAP3430_EN_GPIO4_MASK | 329 OMAP3430_EN_GPIO5_MASK | 330 OMAP3430_EN_GPIO6_MASK | 331 OMAP3430_EN_UART3_MASK | 332 OMAP3430_EN_MCBSP2_MASK | 333 OMAP3430_EN_MCBSP3_MASK | 334 OMAP3430_EN_MCBSP4_MASK, 335 OMAP3430_PER_MOD, PM_WKEN); 336 337 /* and allow them to wake up MPU */ 338 omap2_prm_write_mod_reg(grpsel_uart4_mask | 339 OMAP3430_GRPSEL_GPIO2_MASK | 340 OMAP3430_GRPSEL_GPIO3_MASK | 341 OMAP3430_GRPSEL_GPIO4_MASK | 342 OMAP3430_GRPSEL_GPIO5_MASK | 343 OMAP3430_GRPSEL_GPIO6_MASK | 344 OMAP3430_GRPSEL_UART3_MASK | 345 OMAP3430_GRPSEL_MCBSP2_MASK | 346 OMAP3430_GRPSEL_MCBSP3_MASK | 347 OMAP3430_GRPSEL_MCBSP4_MASK, 348 OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL); 349 350 /* Don't attach IVA interrupts */ 351 if (has_iva) { 352 omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL); 353 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1); 354 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3); 355 omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD, 356 OMAP3430_PM_IVAGRPSEL); 357 } 358 359 /* Clear any pending 'reset' flags */ 360 omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST); 361 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST); 362 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST); 363 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST); 364 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST); 365 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST); 366 omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, 367 OMAP2_RM_RSTST); 368 369 /* Clear any pending PRCM interrupts */ 370 omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); 371 372 /* We need to idle iva2_pwrdm even on am3703 with no iva2. */ 373 omap3xxx_prm_iva_idle(); 374 375 omap3_prm_reset_modem(); 376 } 377 378 /** 379 * omap3430_pre_es3_1_reconfigure_io_chain - restart wake-up daisy chain 380 * 381 * The ST_IO_CHAIN bit does not exist in 3430 before es3.1. The only 382 * thing we can do is toggle EN_IO bit for earlier omaps. 383 */ 384 static void omap3430_pre_es3_1_reconfigure_io_chain(void) 385 { 386 omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, 387 PM_WKEN); 388 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, 389 PM_WKEN); 390 omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN); 391 } 392 393 /** 394 * omap3_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain 395 * 396 * Clear any previously-latched I/O wakeup events and ensure that the 397 * I/O wakeup gates are aligned with the current mux settings. Works 398 * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then 399 * deasserting WUCLKIN and clearing the ST_IO_CHAIN WKST bit. No 400 * return value. These registers are only available in 3430 es3.1 and later. 401 */ 402 static void omap3_prm_reconfigure_io_chain(void) 403 { 404 int i = 0; 405 406 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD, 407 PM_WKEN); 408 409 omap_test_timeout(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST) & 410 OMAP3430_ST_IO_CHAIN_MASK, 411 MAX_IOPAD_LATCH_TIME, i); 412 if (i == MAX_IOPAD_LATCH_TIME) 413 pr_warn("PRM: I/O chain clock line assertion timed out\n"); 414 415 omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD, 416 PM_WKEN); 417 418 omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD, 419 PM_WKST); 420 421 omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST); 422 } 423 424 /** 425 * omap3xxx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches 426 * 427 * Activates the I/O wakeup event latches and allows events logged by 428 * those latches to signal a wakeup event to the PRCM. For I/O 429 * wakeups to occur, WAKEUPENABLE bits must be set in the pad mux 430 * registers, and omap3xxx_prm_reconfigure_io_chain() must be called. 431 * No return value. 432 */ 433 static void omap3xxx_prm_enable_io_wakeup(void) 434 { 435 if (prm_features & PRM_HAS_IO_WAKEUP) 436 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, 437 PM_WKEN); 438 } 439 440 /** 441 * omap3xxx_prm_read_reset_sources - return the last SoC reset source 442 * 443 * Return a u32 representing the last reset sources of the SoC. The 444 * returned reset source bits are standardized across OMAP SoCs. 445 */ 446 static u32 omap3xxx_prm_read_reset_sources(void) 447 { 448 struct prm_reset_src_map *p; 449 u32 r = 0; 450 u32 v; 451 452 v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST); 453 454 p = omap3xxx_prm_reset_src_map; 455 while (p->reg_shift >= 0 && p->std_shift >= 0) { 456 if (v & (1 << p->reg_shift)) 457 r |= 1 << p->std_shift; 458 p++; 459 } 460 461 return r; 462 } 463 464 /** 465 * omap3xxx_prm_iva_idle - ensure IVA is in idle so it can be put into retention 466 * 467 * In cases where IVA2 is activated by bootcode, it may prevent 468 * full-chip retention or off-mode because it is not idle. This 469 * function forces the IVA2 into idle state so it can go 470 * into retention/off and thus allow full-chip retention/off. 471 */ 472 void omap3xxx_prm_iva_idle(void) 473 { 474 /* ensure IVA2 clock is disabled */ 475 omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN); 476 477 /* if no clock activity, nothing else to do */ 478 if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) & 479 OMAP3430_CLKACTIVITY_IVA2_MASK)) 480 return; 481 482 /* Reset IVA2 */ 483 omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK | 484 OMAP3430_RST2_IVA2_MASK | 485 OMAP3430_RST3_IVA2_MASK, 486 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); 487 488 /* Enable IVA2 clock */ 489 omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK, 490 OMAP3430_IVA2_MOD, CM_FCLKEN); 491 492 /* Un-reset IVA2 */ 493 omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); 494 495 /* Disable IVA2 clock */ 496 omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN); 497 498 /* Reset IVA2 */ 499 omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK | 500 OMAP3430_RST2_IVA2_MASK | 501 OMAP3430_RST3_IVA2_MASK, 502 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); 503 } 504 505 /** 506 * omap3xxx_prm_clear_global_cold_reset - checks the global cold reset status 507 * and clears it if asserted 508 * 509 * Checks if cold-reset has occurred and clears the status bit if yes. Returns 510 * 1 if cold-reset has occurred, 0 otherwise. 511 */ 512 int omap3xxx_prm_clear_global_cold_reset(void) 513 { 514 if (omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP3_PRM_RSTST_OFFSET) & 515 OMAP3430_GLOBAL_COLD_RST_MASK) { 516 omap2_prm_set_mod_reg_bits(OMAP3430_GLOBAL_COLD_RST_MASK, 517 OMAP3430_GR_MOD, 518 OMAP3_PRM_RSTST_OFFSET); 519 return 1; 520 } 521 522 return 0; 523 } 524 525 void omap3_prm_save_scratchpad_contents(u32 *ptr) 526 { 527 *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD, 528 OMAP3_PRM_CLKSRC_CTRL_OFFSET); 529 530 *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD, 531 OMAP3_PRM_CLKSEL_OFFSET); 532 } 533 534 /* Powerdomain low-level functions */ 535 536 static int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) 537 { 538 omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK, 539 (pwrst << OMAP_POWERSTATE_SHIFT), 540 pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL); 541 return 0; 542 } 543 544 static int omap3_pwrdm_read_next_pwrst(struct powerdomain *pwrdm) 545 { 546 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 547 OMAP2_PM_PWSTCTRL, 548 OMAP_POWERSTATE_MASK); 549 } 550 551 static int omap3_pwrdm_read_pwrst(struct powerdomain *pwrdm) 552 { 553 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 554 OMAP2_PM_PWSTST, 555 OMAP_POWERSTATEST_MASK); 556 } 557 558 /* Applicable only for OMAP3. Not supported on OMAP2 */ 559 static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) 560 { 561 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 562 OMAP3430_PM_PREPWSTST, 563 OMAP3430_LASTPOWERSTATEENTERED_MASK); 564 } 565 566 static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) 567 { 568 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 569 OMAP2_PM_PWSTST, 570 OMAP3430_LOGICSTATEST_MASK); 571 } 572 573 static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm) 574 { 575 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 576 OMAP2_PM_PWSTCTRL, 577 OMAP3430_LOGICSTATEST_MASK); 578 } 579 580 static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) 581 { 582 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 583 OMAP3430_PM_PREPWSTST, 584 OMAP3430_LASTLOGICSTATEENTERED_MASK); 585 } 586 587 static int omap3_get_mem_bank_lastmemst_mask(u8 bank) 588 { 589 switch (bank) { 590 case 0: 591 return OMAP3430_LASTMEM1STATEENTERED_MASK; 592 case 1: 593 return OMAP3430_LASTMEM2STATEENTERED_MASK; 594 case 2: 595 return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK; 596 case 3: 597 return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK; 598 default: 599 WARN_ON(1); /* should never happen */ 600 return -EEXIST; 601 } 602 return 0; 603 } 604 605 static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) 606 { 607 u32 m; 608 609 m = omap3_get_mem_bank_lastmemst_mask(bank); 610 611 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 612 OMAP3430_PM_PREPWSTST, m); 613 } 614 615 static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) 616 { 617 omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST); 618 return 0; 619 } 620 621 static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) 622 { 623 return omap2_prm_rmw_mod_reg_bits(0, 624 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 625 pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL); 626 } 627 628 static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) 629 { 630 return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 631 0, pwrdm->prcm_offs, 632 OMAP2_PM_PWSTCTRL); 633 } 634 635 struct pwrdm_ops omap3_pwrdm_operations = { 636 .pwrdm_set_next_pwrst = omap3_pwrdm_set_next_pwrst, 637 .pwrdm_read_next_pwrst = omap3_pwrdm_read_next_pwrst, 638 .pwrdm_read_pwrst = omap3_pwrdm_read_pwrst, 639 .pwrdm_read_prev_pwrst = omap3_pwrdm_read_prev_pwrst, 640 .pwrdm_set_logic_retst = omap2_pwrdm_set_logic_retst, 641 .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst, 642 .pwrdm_read_logic_retst = omap3_pwrdm_read_logic_retst, 643 .pwrdm_read_prev_logic_pwrst = omap3_pwrdm_read_prev_logic_pwrst, 644 .pwrdm_set_mem_onst = omap2_pwrdm_set_mem_onst, 645 .pwrdm_set_mem_retst = omap2_pwrdm_set_mem_retst, 646 .pwrdm_read_mem_pwrst = omap2_pwrdm_read_mem_pwrst, 647 .pwrdm_read_mem_retst = omap2_pwrdm_read_mem_retst, 648 .pwrdm_read_prev_mem_pwrst = omap3_pwrdm_read_prev_mem_pwrst, 649 .pwrdm_clear_all_prev_pwrst = omap3_pwrdm_clear_all_prev_pwrst, 650 .pwrdm_enable_hdwr_sar = omap3_pwrdm_enable_hdwr_sar, 651 .pwrdm_disable_hdwr_sar = omap3_pwrdm_disable_hdwr_sar, 652 .pwrdm_wait_transition = omap2_pwrdm_wait_transition, 653 }; 654 655 /* 656 * 657 */ 658 659 static int omap3xxx_prm_late_init(void); 660 661 static struct prm_ll_data omap3xxx_prm_ll_data = { 662 .read_reset_sources = &omap3xxx_prm_read_reset_sources, 663 .late_init = &omap3xxx_prm_late_init, 664 .assert_hardreset = &omap2_prm_assert_hardreset, 665 .deassert_hardreset = &omap2_prm_deassert_hardreset, 666 .is_hardreset_asserted = &omap2_prm_is_hardreset_asserted, 667 .reset_system = &omap3xxx_prm_dpll3_reset, 668 .clear_mod_irqs = &omap3xxx_prm_clear_mod_irqs, 669 .vp_check_txdone = &omap3_prm_vp_check_txdone, 670 .vp_clear_txdone = &omap3_prm_vp_clear_txdone, 671 }; 672 673 int __init omap3xxx_prm_init(const struct omap_prcm_init_data *data) 674 { 675 omap2_clk_legacy_provider_init(TI_CLKM_PRM, 676 prm_base.va + OMAP3430_IVA2_MOD); 677 if (omap3_has_io_wakeup()) 678 prm_features |= PRM_HAS_IO_WAKEUP; 679 680 return prm_register(&omap3xxx_prm_ll_data); 681 } 682 683 static const struct of_device_id omap3_prm_dt_match_table[] = { 684 { .compatible = "ti,omap3-prm" }, 685 { } 686 }; 687 688 static int omap3xxx_prm_late_init(void) 689 { 690 struct device_node *np; 691 int irq_num; 692 693 if (!(prm_features & PRM_HAS_IO_WAKEUP)) 694 return 0; 695 696 if (omap3_has_io_chain_ctrl()) 697 omap3_prcm_irq_setup.reconfigure_io_chain = 698 omap3_prm_reconfigure_io_chain; 699 else 700 omap3_prcm_irq_setup.reconfigure_io_chain = 701 omap3430_pre_es3_1_reconfigure_io_chain; 702 703 np = of_find_matching_node(NULL, omap3_prm_dt_match_table); 704 if (!np) { 705 pr_err("PRM: no device tree node for interrupt?\n"); 706 707 return -ENODEV; 708 } 709 710 irq_num = of_irq_get(np, 0); 711 if (irq_num == -EPROBE_DEFER) 712 return irq_num; 713 714 omap3_prcm_irq_setup.irq = irq_num; 715 716 omap3xxx_prm_enable_io_wakeup(); 717 718 return omap_prcm_register_chain_handler(&omap3_prcm_irq_setup); 719 } 720 721 static void __exit omap3xxx_prm_exit(void) 722 { 723 prm_unregister(&omap3xxx_prm_ll_data); 724 } 725 __exitcall(omap3xxx_prm_exit); 726