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 static void omap3xxx_prm_iva_idle(void); 36 37 static const struct omap_prcm_irq omap3_prcm_irqs[] = { 38 OMAP_PRCM_IRQ("wkup", 0, 0), 39 OMAP_PRCM_IRQ("io", 9, 1), 40 }; 41 42 static struct omap_prcm_irq_setup omap3_prcm_irq_setup = { 43 .ack = OMAP3_PRM_IRQSTATUS_MPU_OFFSET, 44 .mask = OMAP3_PRM_IRQENABLE_MPU_OFFSET, 45 .nr_regs = 1, 46 .irqs = omap3_prcm_irqs, 47 .nr_irqs = ARRAY_SIZE(omap3_prcm_irqs), 48 .irq = 11 + OMAP_INTC_START, 49 .read_pending_irqs = &omap3xxx_prm_read_pending_irqs, 50 .ocp_barrier = &omap3xxx_prm_ocp_barrier, 51 .save_and_clear_irqen = &omap3xxx_prm_save_and_clear_irqen, 52 .restore_irqen = &omap3xxx_prm_restore_irqen, 53 .reconfigure_io_chain = NULL, 54 }; 55 56 /* 57 * omap3_prm_reset_src_map - map from bits in the PRM_RSTST hardware 58 * register (which are specific to OMAP3xxx SoCs) to reset source ID 59 * bit shifts (which is an OMAP SoC-independent enumeration) 60 */ 61 static struct prm_reset_src_map omap3xxx_prm_reset_src_map[] = { 62 { OMAP3430_GLOBAL_COLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT }, 63 { OMAP3430_GLOBAL_SW_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT }, 64 { OMAP3430_SECURITY_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT }, 65 { OMAP3430_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT }, 66 { OMAP3430_SECURE_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT }, 67 { OMAP3430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT }, 68 { OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT, 69 OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT }, 70 { OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT, 71 OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT }, 72 { OMAP3430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT }, 73 { OMAP3430_ICECRUSHER_RST_SHIFT, OMAP_ICECRUSHER_RST_SRC_ID_SHIFT }, 74 { -1, -1 }, 75 }; 76 77 /* PRM VP */ 78 79 /* 80 * struct omap3_vp - OMAP3 VP register access description. 81 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg 82 */ 83 struct omap3_vp { 84 u32 tranxdone_status; 85 }; 86 87 static struct omap3_vp omap3_vp[] = { 88 [OMAP3_VP_VDD_MPU_ID] = { 89 .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK, 90 }, 91 [OMAP3_VP_VDD_CORE_ID] = { 92 .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK, 93 }, 94 }; 95 96 #define MAX_VP_ID ARRAY_SIZE(omap3_vp); 97 98 static u32 omap3_prm_vp_check_txdone(u8 vp_id) 99 { 100 struct omap3_vp *vp = &omap3_vp[vp_id]; 101 u32 irqstatus; 102 103 irqstatus = omap2_prm_read_mod_reg(OCP_MOD, 104 OMAP3_PRM_IRQSTATUS_MPU_OFFSET); 105 return irqstatus & vp->tranxdone_status; 106 } 107 108 static void omap3_prm_vp_clear_txdone(u8 vp_id) 109 { 110 struct omap3_vp *vp = &omap3_vp[vp_id]; 111 112 omap2_prm_write_mod_reg(vp->tranxdone_status, 113 OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); 114 } 115 116 u32 omap3_prm_vcvp_read(u8 offset) 117 { 118 return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, offset); 119 } 120 121 void omap3_prm_vcvp_write(u32 val, u8 offset) 122 { 123 omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, offset); 124 } 125 126 u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset) 127 { 128 return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, offset); 129 } 130 131 /** 132 * omap3xxx_prm_dpll3_reset - use DPLL3 reset to reboot the OMAP SoC 133 * 134 * Set the DPLL3 reset bit, which should reboot the SoC. This is the 135 * recommended way to restart the SoC, considering Errata i520. No 136 * return value. 137 */ 138 static void omap3xxx_prm_dpll3_reset(void) 139 { 140 omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, OMAP3430_GR_MOD, 141 OMAP2_RM_RSTCTRL); 142 /* OCP barrier */ 143 omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL); 144 } 145 146 /** 147 * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events 148 * @events: ptr to a u32, preallocated by caller 149 * 150 * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM 151 * MPU IRQs, and store the result into the u32 pointed to by @events. 152 * No return value. 153 */ 154 static void omap3xxx_prm_read_pending_irqs(unsigned long *events) 155 { 156 u32 mask, st; 157 158 /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */ 159 mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET); 160 st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); 161 162 events[0] = mask & st; 163 } 164 165 /** 166 * omap3xxx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete 167 * 168 * Force any buffered writes to the PRM IP block to complete. Needed 169 * by the PRM IRQ handler, which reads and writes directly to the IP 170 * block, to avoid race conditions after acknowledging or clearing IRQ 171 * bits. No return value. 172 */ 173 static void omap3xxx_prm_ocp_barrier(void) 174 { 175 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET); 176 } 177 178 /** 179 * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg 180 * @saved_mask: ptr to a u32 array to save IRQENABLE bits 181 * 182 * Save the PRM_IRQENABLE_MPU register to @saved_mask. @saved_mask 183 * must be allocated by the caller. Intended to be used in the PRM 184 * interrupt handler suspend callback. The OCP barrier is needed to 185 * ensure the write to disable PRM interrupts reaches the PRM before 186 * returning; otherwise, spurious interrupts might occur. No return 187 * value. 188 */ 189 static void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask) 190 { 191 saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD, 192 OMAP3_PRM_IRQENABLE_MPU_OFFSET); 193 omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET); 194 195 /* OCP barrier */ 196 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET); 197 } 198 199 /** 200 * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args 201 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously 202 * 203 * Restore the PRM_IRQENABLE_MPU register from @saved_mask. Intended 204 * to be used in the PRM interrupt handler resume callback to restore 205 * values saved by omap3xxx_prm_save_and_clear_irqen(). No OCP 206 * barrier should be needed here; any pending PRM interrupts will fire 207 * once the writes reach the PRM. No return value. 208 */ 209 static void omap3xxx_prm_restore_irqen(u32 *saved_mask) 210 { 211 omap2_prm_write_mod_reg(saved_mask[0], OCP_MOD, 212 OMAP3_PRM_IRQENABLE_MPU_OFFSET); 213 } 214 215 /** 216 * omap3xxx_prm_clear_mod_irqs - clear wake-up events from PRCM interrupt 217 * @module: PRM module to clear wakeups from 218 * @regs: register set to clear, 1 or 3 219 * @wkst_mask: wkst bits to clear 220 * 221 * The purpose of this function is to clear any wake-up events latched 222 * in the PRCM PM_WKST_x registers. It is possible that a wake-up event 223 * may occur whilst attempting to clear a PM_WKST_x register and thus 224 * set another bit in this register. A while loop is used to ensure 225 * that any peripheral wake-up events occurring while attempting to 226 * clear the PM_WKST_x are detected and cleared. 227 */ 228 static int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 wkst_mask) 229 { 230 u32 wkst, fclk, iclk, clken; 231 u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1; 232 u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1; 233 u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1; 234 u16 grpsel_off = (regs == 3) ? 235 OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL; 236 int c = 0; 237 238 wkst = omap2_prm_read_mod_reg(module, wkst_off); 239 wkst &= omap2_prm_read_mod_reg(module, grpsel_off); 240 wkst &= wkst_mask; 241 if (wkst) { 242 iclk = omap2_cm_read_mod_reg(module, iclk_off); 243 fclk = omap2_cm_read_mod_reg(module, fclk_off); 244 while (wkst) { 245 clken = wkst; 246 omap2_cm_set_mod_reg_bits(clken, module, iclk_off); 247 /* 248 * For USBHOST, we don't know whether HOST1 or 249 * HOST2 woke us up, so enable both f-clocks 250 */ 251 if (module == OMAP3430ES2_USBHOST_MOD) 252 clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT; 253 omap2_cm_set_mod_reg_bits(clken, module, fclk_off); 254 omap2_prm_write_mod_reg(wkst, module, wkst_off); 255 wkst = omap2_prm_read_mod_reg(module, wkst_off); 256 wkst &= wkst_mask; 257 c++; 258 } 259 omap2_cm_write_mod_reg(iclk, module, iclk_off); 260 omap2_cm_write_mod_reg(fclk, module, fclk_off); 261 } 262 263 return c; 264 } 265 266 /** 267 * omap3_prm_reset_modem - toggle reset signal for modem 268 * 269 * Toggles the reset signal to modem IP block. Required to allow 270 * OMAP3430 without stacked modem to idle properly. 271 */ 272 static void __init omap3_prm_reset_modem(void) 273 { 274 omap2_prm_write_mod_reg( 275 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK | 276 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK, 277 CORE_MOD, OMAP2_RM_RSTCTRL); 278 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL); 279 } 280 281 /** 282 * omap3_prm_init_pm - initialize PM related registers for PRM 283 * @has_uart4: SoC has UART4 284 * @has_iva: SoC has IVA 285 * 286 * Initializes PRM registers for PM use. Called from PM init. 287 */ 288 void __init omap3_prm_init_pm(bool has_uart4, bool has_iva) 289 { 290 u32 en_uart4_mask; 291 u32 grpsel_uart4_mask; 292 293 /* 294 * Enable control of expternal oscillator through 295 * sys_clkreq. In the long run clock framework should 296 * take care of this. 297 */ 298 omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK, 299 1 << OMAP_AUTOEXTCLKMODE_SHIFT, 300 OMAP3430_GR_MOD, 301 OMAP3_PRM_CLKSRC_CTRL_OFFSET); 302 303 /* setup wakup source */ 304 omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK | 305 OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK, 306 WKUP_MOD, PM_WKEN); 307 /* No need to write EN_IO, that is always enabled */ 308 omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK | 309 OMAP3430_GRPSEL_GPT1_MASK | 310 OMAP3430_GRPSEL_GPT12_MASK, 311 WKUP_MOD, OMAP3430_PM_MPUGRPSEL); 312 313 /* Enable PM_WKEN to support DSS LPR */ 314 omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK, 315 OMAP3430_DSS_MOD, PM_WKEN); 316 317 if (has_uart4) { 318 en_uart4_mask = OMAP3630_EN_UART4_MASK; 319 grpsel_uart4_mask = OMAP3630_GRPSEL_UART4_MASK; 320 } else { 321 en_uart4_mask = 0; 322 grpsel_uart4_mask = 0; 323 } 324 325 /* Enable wakeups in PER */ 326 omap2_prm_write_mod_reg(en_uart4_mask | 327 OMAP3430_EN_GPIO2_MASK | 328 OMAP3430_EN_GPIO3_MASK | 329 OMAP3430_EN_GPIO4_MASK | 330 OMAP3430_EN_GPIO5_MASK | 331 OMAP3430_EN_GPIO6_MASK | 332 OMAP3430_EN_UART3_MASK | 333 OMAP3430_EN_MCBSP2_MASK | 334 OMAP3430_EN_MCBSP3_MASK | 335 OMAP3430_EN_MCBSP4_MASK, 336 OMAP3430_PER_MOD, PM_WKEN); 337 338 /* and allow them to wake up MPU */ 339 omap2_prm_write_mod_reg(grpsel_uart4_mask | 340 OMAP3430_GRPSEL_GPIO2_MASK | 341 OMAP3430_GRPSEL_GPIO3_MASK | 342 OMAP3430_GRPSEL_GPIO4_MASK | 343 OMAP3430_GRPSEL_GPIO5_MASK | 344 OMAP3430_GRPSEL_GPIO6_MASK | 345 OMAP3430_GRPSEL_UART3_MASK | 346 OMAP3430_GRPSEL_MCBSP2_MASK | 347 OMAP3430_GRPSEL_MCBSP3_MASK | 348 OMAP3430_GRPSEL_MCBSP4_MASK, 349 OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL); 350 351 /* Don't attach IVA interrupts */ 352 if (has_iva) { 353 omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL); 354 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1); 355 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3); 356 omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD, 357 OMAP3430_PM_IVAGRPSEL); 358 } 359 360 /* Clear any pending 'reset' flags */ 361 omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST); 362 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST); 363 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST); 364 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST); 365 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST); 366 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST); 367 omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, 368 OMAP2_RM_RSTST); 369 370 /* Clear any pending PRCM interrupts */ 371 omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); 372 373 /* We need to idle iva2_pwrdm even on am3703 with no iva2. */ 374 omap3xxx_prm_iva_idle(); 375 376 omap3_prm_reset_modem(); 377 } 378 379 /** 380 * omap3430_pre_es3_1_reconfigure_io_chain - restart wake-up daisy chain 381 * 382 * The ST_IO_CHAIN bit does not exist in 3430 before es3.1. The only 383 * thing we can do is toggle EN_IO bit for earlier omaps. 384 */ 385 static void omap3430_pre_es3_1_reconfigure_io_chain(void) 386 { 387 omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, 388 PM_WKEN); 389 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, 390 PM_WKEN); 391 omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN); 392 } 393 394 /** 395 * omap3_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain 396 * 397 * Clear any previously-latched I/O wakeup events and ensure that the 398 * I/O wakeup gates are aligned with the current mux settings. Works 399 * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then 400 * deasserting WUCLKIN and clearing the ST_IO_CHAIN WKST bit. No 401 * return value. These registers are only available in 3430 es3.1 and later. 402 */ 403 static void omap3_prm_reconfigure_io_chain(void) 404 { 405 int i = 0; 406 407 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD, 408 PM_WKEN); 409 410 omap_test_timeout(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST) & 411 OMAP3430_ST_IO_CHAIN_MASK, 412 MAX_IOPAD_LATCH_TIME, i); 413 if (i == MAX_IOPAD_LATCH_TIME) 414 pr_warn("PRM: I/O chain clock line assertion timed out\n"); 415 416 omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD, 417 PM_WKEN); 418 419 omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD, 420 PM_WKST); 421 422 omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST); 423 } 424 425 /** 426 * omap3xxx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches 427 * 428 * Activates the I/O wakeup event latches and allows events logged by 429 * those latches to signal a wakeup event to the PRCM. For I/O 430 * wakeups to occur, WAKEUPENABLE bits must be set in the pad mux 431 * registers, and omap3xxx_prm_reconfigure_io_chain() must be called. 432 * No return value. 433 */ 434 static void omap3xxx_prm_enable_io_wakeup(void) 435 { 436 if (prm_features & PRM_HAS_IO_WAKEUP) 437 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, 438 PM_WKEN); 439 } 440 441 /** 442 * omap3xxx_prm_read_reset_sources - return the last SoC reset source 443 * 444 * Return a u32 representing the last reset sources of the SoC. The 445 * returned reset source bits are standardized across OMAP SoCs. 446 */ 447 static u32 omap3xxx_prm_read_reset_sources(void) 448 { 449 struct prm_reset_src_map *p; 450 u32 r = 0; 451 u32 v; 452 453 v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST); 454 455 p = omap3xxx_prm_reset_src_map; 456 while (p->reg_shift >= 0 && p->std_shift >= 0) { 457 if (v & (1 << p->reg_shift)) 458 r |= 1 << p->std_shift; 459 p++; 460 } 461 462 return r; 463 } 464 465 /** 466 * omap3xxx_prm_iva_idle - ensure IVA is in idle so it can be put into retention 467 * 468 * In cases where IVA2 is activated by bootcode, it may prevent 469 * full-chip retention or off-mode because it is not idle. This 470 * function forces the IVA2 into idle state so it can go 471 * into retention/off and thus allow full-chip retention/off. 472 */ 473 static void omap3xxx_prm_iva_idle(void) 474 { 475 /* ensure IVA2 clock is disabled */ 476 omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN); 477 478 /* if no clock activity, nothing else to do */ 479 if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) & 480 OMAP3430_CLKACTIVITY_IVA2_MASK)) 481 return; 482 483 /* Reset IVA2 */ 484 omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK | 485 OMAP3430_RST2_IVA2_MASK | 486 OMAP3430_RST3_IVA2_MASK, 487 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); 488 489 /* Enable IVA2 clock */ 490 omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK, 491 OMAP3430_IVA2_MOD, CM_FCLKEN); 492 493 /* Un-reset IVA2 */ 494 omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); 495 496 /* Disable IVA2 clock */ 497 omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN); 498 499 /* Reset IVA2 */ 500 omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK | 501 OMAP3430_RST2_IVA2_MASK | 502 OMAP3430_RST3_IVA2_MASK, 503 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); 504 } 505 506 /** 507 * omap3xxx_prm_clear_global_cold_reset - checks the global cold reset status 508 * and clears it if asserted 509 * 510 * Checks if cold-reset has occurred and clears the status bit if yes. Returns 511 * 1 if cold-reset has occurred, 0 otherwise. 512 */ 513 int omap3xxx_prm_clear_global_cold_reset(void) 514 { 515 if (omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP3_PRM_RSTST_OFFSET) & 516 OMAP3430_GLOBAL_COLD_RST_MASK) { 517 omap2_prm_set_mod_reg_bits(OMAP3430_GLOBAL_COLD_RST_MASK, 518 OMAP3430_GR_MOD, 519 OMAP3_PRM_RSTST_OFFSET); 520 return 1; 521 } 522 523 return 0; 524 } 525 526 void omap3_prm_save_scratchpad_contents(u32 *ptr) 527 { 528 *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD, 529 OMAP3_PRM_CLKSRC_CTRL_OFFSET); 530 531 *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD, 532 OMAP3_PRM_CLKSEL_OFFSET); 533 } 534 535 /* Powerdomain low-level functions */ 536 537 static int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) 538 { 539 omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK, 540 (pwrst << OMAP_POWERSTATE_SHIFT), 541 pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL); 542 return 0; 543 } 544 545 static int omap3_pwrdm_read_next_pwrst(struct powerdomain *pwrdm) 546 { 547 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 548 OMAP2_PM_PWSTCTRL, 549 OMAP_POWERSTATE_MASK); 550 } 551 552 static int omap3_pwrdm_read_pwrst(struct powerdomain *pwrdm) 553 { 554 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 555 OMAP2_PM_PWSTST, 556 OMAP_POWERSTATEST_MASK); 557 } 558 559 /* Applicable only for OMAP3. Not supported on OMAP2 */ 560 static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) 561 { 562 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 563 OMAP3430_PM_PREPWSTST, 564 OMAP3430_LASTPOWERSTATEENTERED_MASK); 565 } 566 567 static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) 568 { 569 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 570 OMAP2_PM_PWSTST, 571 OMAP3430_LOGICSTATEST_MASK); 572 } 573 574 static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm) 575 { 576 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 577 OMAP2_PM_PWSTCTRL, 578 OMAP3430_LOGICSTATEST_MASK); 579 } 580 581 static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) 582 { 583 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 584 OMAP3430_PM_PREPWSTST, 585 OMAP3430_LASTLOGICSTATEENTERED_MASK); 586 } 587 588 static int omap3_get_mem_bank_lastmemst_mask(u8 bank) 589 { 590 switch (bank) { 591 case 0: 592 return OMAP3430_LASTMEM1STATEENTERED_MASK; 593 case 1: 594 return OMAP3430_LASTMEM2STATEENTERED_MASK; 595 case 2: 596 return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK; 597 case 3: 598 return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK; 599 default: 600 WARN_ON(1); /* should never happen */ 601 return -EEXIST; 602 } 603 return 0; 604 } 605 606 static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) 607 { 608 u32 m; 609 610 m = omap3_get_mem_bank_lastmemst_mask(bank); 611 612 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, 613 OMAP3430_PM_PREPWSTST, m); 614 } 615 616 static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) 617 { 618 omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST); 619 return 0; 620 } 621 622 static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) 623 { 624 return omap2_prm_rmw_mod_reg_bits(0, 625 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 626 pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL); 627 } 628 629 static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) 630 { 631 return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 632 0, pwrdm->prcm_offs, 633 OMAP2_PM_PWSTCTRL); 634 } 635 636 struct pwrdm_ops omap3_pwrdm_operations = { 637 .pwrdm_set_next_pwrst = omap3_pwrdm_set_next_pwrst, 638 .pwrdm_read_next_pwrst = omap3_pwrdm_read_next_pwrst, 639 .pwrdm_read_pwrst = omap3_pwrdm_read_pwrst, 640 .pwrdm_read_prev_pwrst = omap3_pwrdm_read_prev_pwrst, 641 .pwrdm_set_logic_retst = omap2_pwrdm_set_logic_retst, 642 .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst, 643 .pwrdm_read_logic_retst = omap3_pwrdm_read_logic_retst, 644 .pwrdm_read_prev_logic_pwrst = omap3_pwrdm_read_prev_logic_pwrst, 645 .pwrdm_set_mem_onst = omap2_pwrdm_set_mem_onst, 646 .pwrdm_set_mem_retst = omap2_pwrdm_set_mem_retst, 647 .pwrdm_read_mem_pwrst = omap2_pwrdm_read_mem_pwrst, 648 .pwrdm_read_mem_retst = omap2_pwrdm_read_mem_retst, 649 .pwrdm_read_prev_mem_pwrst = omap3_pwrdm_read_prev_mem_pwrst, 650 .pwrdm_clear_all_prev_pwrst = omap3_pwrdm_clear_all_prev_pwrst, 651 .pwrdm_enable_hdwr_sar = omap3_pwrdm_enable_hdwr_sar, 652 .pwrdm_disable_hdwr_sar = omap3_pwrdm_disable_hdwr_sar, 653 .pwrdm_wait_transition = omap2_pwrdm_wait_transition, 654 }; 655 656 /* 657 * 658 */ 659 660 static int omap3xxx_prm_late_init(void); 661 662 static struct prm_ll_data omap3xxx_prm_ll_data = { 663 .read_reset_sources = &omap3xxx_prm_read_reset_sources, 664 .late_init = &omap3xxx_prm_late_init, 665 .assert_hardreset = &omap2_prm_assert_hardreset, 666 .deassert_hardreset = &omap2_prm_deassert_hardreset, 667 .is_hardreset_asserted = &omap2_prm_is_hardreset_asserted, 668 .reset_system = &omap3xxx_prm_dpll3_reset, 669 .clear_mod_irqs = &omap3xxx_prm_clear_mod_irqs, 670 .vp_check_txdone = &omap3_prm_vp_check_txdone, 671 .vp_clear_txdone = &omap3_prm_vp_clear_txdone, 672 }; 673 674 int __init omap3xxx_prm_init(const struct omap_prcm_init_data *data) 675 { 676 omap2_clk_legacy_provider_init(TI_CLKM_PRM, 677 prm_base.va + OMAP3430_IVA2_MOD); 678 if (omap3_has_io_wakeup()) 679 prm_features |= PRM_HAS_IO_WAKEUP; 680 681 return prm_register(&omap3xxx_prm_ll_data); 682 } 683 684 static const struct of_device_id omap3_prm_dt_match_table[] = { 685 { .compatible = "ti,omap3-prm" }, 686 { } 687 }; 688 689 static int omap3xxx_prm_late_init(void) 690 { 691 struct device_node *np; 692 int irq_num; 693 694 if (!(prm_features & PRM_HAS_IO_WAKEUP)) 695 return 0; 696 697 if (omap3_has_io_chain_ctrl()) 698 omap3_prcm_irq_setup.reconfigure_io_chain = 699 omap3_prm_reconfigure_io_chain; 700 else 701 omap3_prcm_irq_setup.reconfigure_io_chain = 702 omap3430_pre_es3_1_reconfigure_io_chain; 703 704 np = of_find_matching_node(NULL, omap3_prm_dt_match_table); 705 if (!np) { 706 pr_err("PRM: no device tree node for interrupt?\n"); 707 708 return -ENODEV; 709 } 710 711 irq_num = of_irq_get(np, 0); 712 of_node_put(np); 713 if (irq_num == -EPROBE_DEFER) 714 return irq_num; 715 716 omap3_prcm_irq_setup.irq = irq_num; 717 718 omap3xxx_prm_enable_io_wakeup(); 719 720 return omap_prcm_register_chain_handler(&omap3_prcm_irq_setup); 721 } 722 723 static void __exit omap3xxx_prm_exit(void) 724 { 725 prm_unregister(&omap3xxx_prm_ll_data); 726 } 727 __exitcall(omap3xxx_prm_exit); 728