2 * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
3 * Copyright (c) 2011, Google, Inc.
5 * Author: Colin Cross <ccross@android.com>
6 * Gary King <gking@nvidia.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <linux/linkage.h>
23 #include <asm/assembler.h>
24 #include <asm/proc-fns.h>
26 #include <asm/cache.h>
33 #define EMC_ADR_CFG 0x10
34 #define EMC_REFRESH 0x70
36 #define EMC_SELF_REF 0xe0
37 #define EMC_REQ_CTRL 0x2b0
38 #define EMC_EMC_STATUS 0x2b4
40 #define CLK_RESET_CCLK_BURST 0x20
41 #define CLK_RESET_CCLK_DIVIDER 0x24
42 #define CLK_RESET_SCLK_BURST 0x28
43 #define CLK_RESET_SCLK_DIVIDER 0x2c
44 #define CLK_RESET_PLLC_BASE 0x80
45 #define CLK_RESET_PLLM_BASE 0x90
46 #define CLK_RESET_PLLP_BASE 0xa0
48 #define APB_MISC_XM2CFGCPADCTRL 0x8c8
49 #define APB_MISC_XM2CFGDPADCTRL 0x8cc
50 #define APB_MISC_XM2CLKCFGPADCTRL 0x8d0
51 #define APB_MISC_XM2COMPPADCTRL 0x8d4
52 #define APB_MISC_XM2VTTGENPADCTRL 0x8d8
53 #define APB_MISC_XM2CFGCPADCTRL2 0x8e4
54 #define APB_MISC_XM2CFGDPADCTRL2 0x8e8
56 .macro pll_enable, rd, r_car_base, pll_base
57 ldr \rd, [\r_car_base, #\pll_base]
59 orreq \rd, \rd, #(1 << 30)
60 streq \rd, [\r_car_base, #\pll_base]
63 .macro emc_device_mask, rd, base
64 ldr \rd, [\base, #EMC_ADR_CFG]
66 moveq \rd, #(0x1 << 8) @ just 1 device
67 movne \rd, #(0x3 << 8) @ 2 devices
70 #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
72 * tegra20_hotplug_shutdown(void)
74 * puts the current cpu in reset
77 ENTRY(tegra20_hotplug_shutdown)
78 /* Put this CPU down */
80 bl tegra20_cpu_shutdown
81 ret lr @ should never get here
82 ENDPROC(tegra20_hotplug_shutdown)
85 * tegra20_cpu_shutdown(int cpu)
89 * puts the specified CPU in wait-for-event mode on the flow controller
90 * and puts the CPU in reset
91 * can be called on the current cpu or another cpu
92 * if called on the current cpu, does not return
93 * MUST NOT BE CALLED FOR CPU 0.
97 ENTRY(tegra20_cpu_shutdown)
99 reteq lr @ must not be called for CPU 0
100 mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT
101 ldr r2, =__tegra20_cpu1_resettable_status_offset
102 mov r12, #CPU_RESETTABLE
105 cpu_to_halt_reg r1, r0
106 ldr r3, =TEGRA_FLOW_CTRL_VIRT
107 mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
108 str r2, [r3, r1] @ put flow controller in wait event mode
114 ldr r3, =TEGRA_CLK_RESET_VIRT
115 str r1, [r3, #0x340] @ put slave CPU in reset
122 ENDPROC(tegra20_cpu_shutdown)
125 #ifdef CONFIG_PM_SLEEP
129 * spinlock implementation with no atomic test-and-set and no coherence
130 * using Peterson's algorithm on strongly-ordered registers
131 * used to synchronize a cpu waking up from wfi with entering lp2 on idle
133 * The reference link of Peterson's algorithm:
134 * http://en.wikipedia.org/wiki/Peterson's_algorithm
136 * SCRATCH37 = r1 = !turn (inverted from Peterson's algorithm)
138 * r2 = flag[0] (in SCRATCH38)
139 * r3 = flag[1] (in SCRATCH39)
141 * r2 = flag[1] (in SCRATCH39)
142 * r3 = flag[0] (in SCRATCH38)
144 * must be called with MMU on
145 * corrupts r0-r3, r12
147 ENTRY(tegra_pen_lock)
148 mov32 r3, TEGRA_PMC_VIRT
150 add r1, r3, #PMC_SCRATCH37
152 addeq r2, r3, #PMC_SCRATCH38
153 addeq r3, r3, #PMC_SCRATCH39
154 addne r2, r3, #PMC_SCRATCH39
155 addne r3, r3, #PMC_SCRATCH38
158 str r12, [r2] @ flag[cpu] = 1
160 str r12, [r1] @ !turn = cpu
163 cmp r12, #1 @ flag[!cpu] == 1?
165 cmpeq r12, r0 @ !turn == cpu?
166 beq 1b @ while !turn == cpu && flag[!cpu] == 1
169 ENDPROC(tegra_pen_lock)
171 ENTRY(tegra_pen_unlock)
173 mov32 r3, TEGRA_PMC_VIRT
176 addeq r2, r3, #PMC_SCRATCH38
177 addne r2, r3, #PMC_SCRATCH39
181 ENDPROC(tegra_pen_unlock)
184 * tegra20_cpu_clear_resettable(void)
186 * Called to clear the "resettable soon" flag in IRAM variable when
187 * it is expected that the secondary CPU will be idle soon.
189 ENTRY(tegra20_cpu_clear_resettable)
190 mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT
191 ldr r2, =__tegra20_cpu1_resettable_status_offset
192 mov r12, #CPU_NOT_RESETTABLE
195 ENDPROC(tegra20_cpu_clear_resettable)
198 * tegra20_cpu_set_resettable_soon(void)
200 * Called to set the "resettable soon" flag in IRAM variable when
201 * it is expected that the secondary CPU will be idle soon.
203 ENTRY(tegra20_cpu_set_resettable_soon)
204 mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT
205 ldr r2, =__tegra20_cpu1_resettable_status_offset
206 mov r12, #CPU_RESETTABLE_SOON
209 ENDPROC(tegra20_cpu_set_resettable_soon)
212 * tegra20_cpu_is_resettable_soon(void)
214 * Returns true if the "resettable soon" flag in IRAM variable has been
215 * set because it is expected that the secondary CPU will be idle soon.
217 ENTRY(tegra20_cpu_is_resettable_soon)
218 mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT
219 ldr r2, =__tegra20_cpu1_resettable_status_offset
221 cmp r12, #CPU_RESETTABLE_SOON
225 ENDPROC(tegra20_cpu_is_resettable_soon)
228 * tegra20_sleep_core_finish(unsigned long v2p)
230 * Enters suspend in LP0 or LP1 by turning off the mmu and jumping to
231 * tegra20_tear_down_core in IRAM
233 ENTRY(tegra20_sleep_core_finish)
234 /* Flush, disable the L1 data cache and exit SMP */
235 bl tegra_disable_clean_inv_dcache
237 mov32 r3, tegra_shut_off_mmu
240 mov32 r0, tegra20_tear_down_core
241 mov32 r1, tegra20_iram_start
243 mov32 r1, TEGRA_IRAM_LPx_RESUME_AREA
247 ENDPROC(tegra20_sleep_core_finish)
250 * tegra20_sleep_cpu_secondary_finish(unsigned long v2p)
252 * Enters WFI on secondary CPU by exiting coherency.
254 ENTRY(tegra20_sleep_cpu_secondary_finish)
255 stmfd sp!, {r4-r11, lr}
257 mrc p15, 0, r11, c1, c0, 1 @ save actlr before exiting coherency
259 /* Flush and disable the L1 data cache */
260 mov r0, #TEGRA_FLUSH_CACHE_LOUIS
261 bl tegra_disable_clean_inv_dcache
263 mov32 r0, TEGRA_IRAM_RESET_BASE_VIRT
264 ldr r4, =__tegra20_cpu1_resettable_status_offset
265 mov r3, #CPU_RESETTABLE
271 * cpu may be reset while in wfi, which will return through
272 * tegra_resume to cpu_resume
273 * or interrupt may wake wfi, which will return here
274 * cpu state is unchanged - MMU is on, cache is on, coherency
275 * is off, and the data cache is off
277 * r11 contains the original actlr
282 mov32 r0, TEGRA_IRAM_RESET_BASE_VIRT
283 ldr r4, =__tegra20_cpu1_resettable_status_offset
284 mov r3, #CPU_NOT_RESETTABLE
289 /* Re-enable the data cache */
290 mrc p15, 0, r10, c1, c0, 0
292 mcr p15, 0, r10, c1, c0, 0
295 mcr p15, 0, r11, c1, c0, 1 @ reenable coherency
297 /* Invalidate the TLBs & BTAC */
299 mcr p15, 0, r1, c8, c3, 0 @ invalidate shared TLBs
300 mcr p15, 0, r1, c7, c1, 6 @ invalidate shared BTAC
304 /* the cpu was running with coherency disabled,
305 * caches may be out of date */
306 bl v7_flush_kern_cache_louis
308 ldmfd sp!, {r4 - r11, pc}
309 ENDPROC(tegra20_sleep_cpu_secondary_finish)
312 * tegra20_tear_down_cpu
314 * Switches the CPU cluster to PLL-P and enters sleep.
316 ENTRY(tegra20_tear_down_cpu)
317 bl tegra_switch_cpu_to_pllp
318 b tegra20_enter_sleep
319 ENDPROC(tegra20_tear_down_cpu)
321 /* START OF ROUTINES COPIED TO IRAM */
322 .align L1_CACHE_SHIFT
323 .globl tegra20_iram_start
329 * reset vector for LP1 restore; copied into IRAM during suspend.
330 * Brings the system back up to a safe staring point (SDRAM out of
331 * self-refresh, PLLC, PLLM and PLLP reenabled, CPU running on PLLP,
332 * system clock running on the same PLL that it suspended at), and
333 * jumps to tegra_resume to restore virtual addressing and PLLX.
334 * The physical address of tegra_resume expected to be stored in
337 * NOTE: THIS *MUST* BE RELOCATED TO TEGRA_IRAM_LPx_RESUME_AREA.
339 ENTRY(tegra20_lp1_reset)
341 * The CPU and system bus are running at 32KHz and executing from
342 * IRAM when this code is executed; immediately switch to CLKM and
343 * enable PLLM, PLLP, PLLC.
345 mov32 r0, TEGRA_CLK_RESET_BASE
348 str r1, [r0, #CLK_RESET_SCLK_BURST]
349 str r1, [r0, #CLK_RESET_CCLK_BURST]
351 str r1, [r0, #CLK_RESET_CCLK_DIVIDER]
352 str r1, [r0, #CLK_RESET_SCLK_DIVIDER]
354 pll_enable r1, r0, CLK_RESET_PLLM_BASE
355 pll_enable r1, r0, CLK_RESET_PLLP_BASE
356 pll_enable r1, r0, CLK_RESET_PLLC_BASE
358 adr r2, tegra20_sdram_pad_address
359 adr r4, tegra20_sdram_pad_save
362 ldr r6, tegra20_sdram_pad_size
364 ldr r7, [r2, r5] @ r7 is the addr in the pad_address
367 str r1, [r7] @ restore the value in pad_save
374 /* 255uS delay for PLL stabilization */
375 mov32 r7, TEGRA_TMRUS_BASE
378 wait_until r1, r7, r9
380 adr r4, tegra20_sclk_save
382 str r4, [r0, #CLK_RESET_SCLK_BURST]
383 mov32 r4, ((1 << 28) | (4)) @ burst policy is PLLP
384 str r4, [r0, #CLK_RESET_CCLK_BURST]
386 mov32 r0, TEGRA_EMC_BASE
387 ldr r1, [r0, #EMC_CFG]
388 bic r1, r1, #(1 << 31) @ disable DRAM_CLK_STOP
389 str r1, [r0, #EMC_CFG]
392 str r1, [r0, #EMC_SELF_REF] @ take DRAM out of self refresh
394 str r1, [r0, #EMC_NOP]
395 str r1, [r0, #EMC_NOP]
396 str r1, [r0, #EMC_REFRESH]
398 emc_device_mask r1, r0
400 exit_selfrefresh_loop:
401 ldr r2, [r0, #EMC_EMC_STATUS]
403 bne exit_selfrefresh_loop
405 mov r1, #0 @ unstall all transactions
406 str r1, [r0, #EMC_REQ_CTRL]
408 mov32 r0, TEGRA_PMC_BASE
409 ldr r0, [r0, #PMC_SCRATCH41]
410 ret r0 @ jump to tegra_resume
411 ENDPROC(tegra20_lp1_reset)
414 * tegra20_tear_down_core
416 * copied into and executed from IRAM
417 * puts memory in self-refresh for LP0 and LP1
419 tegra20_tear_down_core:
420 bl tegra20_sdram_self_refresh
421 bl tegra20_switch_cpu_to_clk32k
422 b tegra20_enter_sleep
425 * tegra20_switch_cpu_to_clk32k
427 * In LP0 and LP1 all PLLs will be turned off. Switch the CPU and system clock
428 * to the 32KHz clock.
430 tegra20_switch_cpu_to_clk32k:
432 * start by switching to CLKM to safely disable PLLs, then switch to
436 str r0, [r5, #CLK_RESET_SCLK_BURST]
437 str r0, [r5, #CLK_RESET_CCLK_BURST]
439 str r0, [r5, #CLK_RESET_CCLK_DIVIDER]
440 str r0, [r5, #CLK_RESET_SCLK_DIVIDER]
442 /* 2uS delay delay between changing SCLK and disabling PLLs */
443 mov32 r7, TEGRA_TMRUS_BASE
446 wait_until r1, r7, r9
448 /* disable PLLM, PLLP and PLLC */
449 ldr r0, [r5, #CLK_RESET_PLLM_BASE]
450 bic r0, r0, #(1 << 30)
451 str r0, [r5, #CLK_RESET_PLLM_BASE]
452 ldr r0, [r5, #CLK_RESET_PLLP_BASE]
453 bic r0, r0, #(1 << 30)
454 str r0, [r5, #CLK_RESET_PLLP_BASE]
455 ldr r0, [r5, #CLK_RESET_PLLC_BASE]
456 bic r0, r0, #(1 << 30)
457 str r0, [r5, #CLK_RESET_PLLC_BASE]
460 mov r0, #0 /* brust policy = 32KHz */
461 str r0, [r5, #CLK_RESET_SCLK_BURST]
466 * tegra20_enter_sleep
468 * uses flow controller to enter sleep state
469 * executes from IRAM with SDRAM in selfrefresh when target state is LP0 or LP1
470 * executes from SDRAM with target state is LP2
473 mov32 r6, TEGRA_FLOW_CTRL_BASE
475 mov r0, #FLOW_CTRL_WAIT_FOR_INTERRUPT
476 orr r0, r0, #FLOW_CTRL_HALT_CPU_IRQ | FLOW_CTRL_HALT_CPU_FIQ
478 cpu_to_halt_reg r1, r1
481 ldr r0, [r6, r1] /* memory barrier */
485 wfe /* CPU should be power gated here */
490 * tegra20_sdram_self_refresh
492 * called with MMU off and caches disabled
493 * puts sdram in self refresh
494 * must be executed from IRAM
496 tegra20_sdram_self_refresh:
497 mov32 r1, TEGRA_EMC_BASE @ r1 reserved for emc base addr
500 str r2, [r1, #EMC_REQ_CTRL] @ stall incoming DRAM requests
503 ldr r2, [r1, #EMC_EMC_STATUS]
508 str r2, [r1, #EMC_SELF_REF]
510 emc_device_mask r2, r1
513 ldr r3, [r1, #EMC_EMC_STATUS]
516 bne emcself @ loop until DDR in self-refresh
518 adr r2, tegra20_sdram_pad_address
519 adr r3, tegra20_sdram_pad_safe
520 adr r4, tegra20_sdram_pad_save
523 ldr r6, tegra20_sdram_pad_size
525 ldr r0, [r2, r5] @ r0 is the addr in the pad_address
528 str r1, [r4, r5] @ save the content of the addr
531 str r1, [r0] @ set the save val to the addr
538 mov32 r5, TEGRA_CLK_RESET_BASE
539 ldr r0, [r5, #CLK_RESET_SCLK_BURST]
540 adr r2, tegra20_sclk_save
545 tegra20_sdram_pad_address:
546 .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGCPADCTRL
547 .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGDPADCTRL
548 .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CLKCFGPADCTRL
549 .word TEGRA_APB_MISC_BASE + APB_MISC_XM2COMPPADCTRL
550 .word TEGRA_APB_MISC_BASE + APB_MISC_XM2VTTGENPADCTRL
551 .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGCPADCTRL2
552 .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGDPADCTRL2
554 tegra20_sdram_pad_size:
555 .word tegra20_sdram_pad_size - tegra20_sdram_pad_address
557 tegra20_sdram_pad_safe:
569 tegra20_sdram_pad_save:
570 .rept (tegra20_sdram_pad_size - tegra20_sdram_pad_address) / 4
575 /* dummy symbol for end of IRAM */
576 .align L1_CACHE_SHIFT
577 .globl tegra20_iram_end