/* * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved. * Copyright (c) 2011, Google, Inc. * * Author: Colin Cross * Gary King * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #include "irammap.h" #include "sleep.h" #include "flowctrl.h" #define EMC_CFG 0xc #define EMC_ADR_CFG 0x10 #define EMC_REFRESH 0x70 #define EMC_NOP 0xdc #define EMC_SELF_REF 0xe0 #define EMC_REQ_CTRL 0x2b0 #define EMC_EMC_STATUS 0x2b4 #define CLK_RESET_CCLK_BURST 0x20 #define CLK_RESET_CCLK_DIVIDER 0x24 #define CLK_RESET_SCLK_BURST 0x28 #define CLK_RESET_SCLK_DIVIDER 0x2c #define CLK_RESET_PLLC_BASE 0x80 #define CLK_RESET_PLLM_BASE 0x90 #define CLK_RESET_PLLP_BASE 0xa0 #define APB_MISC_XM2CFGCPADCTRL 0x8c8 #define APB_MISC_XM2CFGDPADCTRL 0x8cc #define APB_MISC_XM2CLKCFGPADCTRL 0x8d0 #define APB_MISC_XM2COMPPADCTRL 0x8d4 #define APB_MISC_XM2VTTGENPADCTRL 0x8d8 #define APB_MISC_XM2CFGCPADCTRL2 0x8e4 #define APB_MISC_XM2CFGDPADCTRL2 0x8e8 .macro pll_enable, rd, r_car_base, pll_base ldr \rd, [\r_car_base, #\pll_base] tst \rd, #(1 << 30) orreq \rd, \rd, #(1 << 30) streq \rd, [\r_car_base, #\pll_base] .endm .macro emc_device_mask, rd, base ldr \rd, [\base, #EMC_ADR_CFG] tst \rd, #(0x3 << 24) moveq \rd, #(0x1 << 8) @ just 1 device movne \rd, #(0x3 << 8) @ 2 devices .endm #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP) /* * tegra20_hotplug_shutdown(void) * * puts the current cpu in reset * should never return */ ENTRY(tegra20_hotplug_shutdown) /* Put this CPU down */ cpu_id r0 bl tegra20_cpu_shutdown ret lr @ should never get here ENDPROC(tegra20_hotplug_shutdown) /* * tegra20_cpu_shutdown(int cpu) * * r0 is cpu to reset * * puts the specified CPU in wait-for-event mode on the flow controller * and puts the CPU in reset * can be called on the current cpu or another cpu * if called on the current cpu, does not return * MUST NOT BE CALLED FOR CPU 0. * * corrupts r0-r3, r12 */ ENTRY(tegra20_cpu_shutdown) cmp r0, #0 reteq lr @ must not be called for CPU 0 mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT ldr r2, =__tegra20_cpu1_resettable_status_offset mov r12, #CPU_RESETTABLE strb r12, [r1, r2] cpu_to_halt_reg r1, r0 ldr r3, =TEGRA_FLOW_CTRL_VIRT mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME str r2, [r3, r1] @ put flow controller in wait event mode ldr r2, [r3, r1] isb dsb movw r1, 0x1011 mov r1, r1, lsl r0 ldr r3, =TEGRA_CLK_RESET_VIRT str r1, [r3, #0x340] @ put slave CPU in reset isb dsb cpu_id r3 cmp r3, r0 beq . ret lr ENDPROC(tegra20_cpu_shutdown) #endif #ifdef CONFIG_PM_SLEEP /* * tegra_pen_lock * * spinlock implementation with no atomic test-and-set and no coherence * using Peterson's algorithm on strongly-ordered registers * used to synchronize a cpu waking up from wfi with entering lp2 on idle * * The reference link of Peterson's algorithm: * http://en.wikipedia.org/wiki/Peterson's_algorithm * * SCRATCH37 = r1 = !turn (inverted from Peterson's algorithm) * on cpu 0: * r2 = flag[0] (in SCRATCH38) * r3 = flag[1] (in SCRATCH39) * on cpu1: * r2 = flag[1] (in SCRATCH39) * r3 = flag[0] (in SCRATCH38) * * must be called with MMU on * corrupts r0-r3, r12 */ ENTRY(tegra_pen_lock) mov32 r3, TEGRA_PMC_VIRT cpu_id r0 add r1, r3, #PMC_SCRATCH37 cmp r0, #0 addeq r2, r3, #PMC_SCRATCH38 addeq r3, r3, #PMC_SCRATCH39 addne r2, r3, #PMC_SCRATCH39 addne r3, r3, #PMC_SCRATCH38 mov r12, #1 str r12, [r2] @ flag[cpu] = 1 dsb str r12, [r1] @ !turn = cpu 1: dsb ldr r12, [r3] cmp r12, #1 @ flag[!cpu] == 1? ldreq r12, [r1] cmpeq r12, r0 @ !turn == cpu? beq 1b @ while !turn == cpu && flag[!cpu] == 1 ret lr @ locked ENDPROC(tegra_pen_lock) ENTRY(tegra_pen_unlock) dsb mov32 r3, TEGRA_PMC_VIRT cpu_id r0 cmp r0, #0 addeq r2, r3, #PMC_SCRATCH38 addne r2, r3, #PMC_SCRATCH39 mov r12, #0 str r12, [r2] ret lr ENDPROC(tegra_pen_unlock) /* * tegra20_cpu_clear_resettable(void) * * Called to clear the "resettable soon" flag in IRAM variable when * it is expected that the secondary CPU will be idle soon. */ ENTRY(tegra20_cpu_clear_resettable) mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT ldr r2, =__tegra20_cpu1_resettable_status_offset mov r12, #CPU_NOT_RESETTABLE strb r12, [r1, r2] ret lr ENDPROC(tegra20_cpu_clear_resettable) /* * tegra20_cpu_set_resettable_soon(void) * * Called to set the "resettable soon" flag in IRAM variable when * it is expected that the secondary CPU will be idle soon. */ ENTRY(tegra20_cpu_set_resettable_soon) mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT ldr r2, =__tegra20_cpu1_resettable_status_offset mov r12, #CPU_RESETTABLE_SOON strb r12, [r1, r2] ret lr ENDPROC(tegra20_cpu_set_resettable_soon) /* * tegra20_cpu_is_resettable_soon(void) * * Returns true if the "resettable soon" flag in IRAM variable has been * set because it is expected that the secondary CPU will be idle soon. */ ENTRY(tegra20_cpu_is_resettable_soon) mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT ldr r2, =__tegra20_cpu1_resettable_status_offset ldrb r12, [r1, r2] cmp r12, #CPU_RESETTABLE_SOON moveq r0, #1 movne r0, #0 ret lr ENDPROC(tegra20_cpu_is_resettable_soon) /* * tegra20_sleep_core_finish(unsigned long v2p) * * Enters suspend in LP0 or LP1 by turning off the mmu and jumping to * tegra20_tear_down_core in IRAM */ ENTRY(tegra20_sleep_core_finish) /* Flush, disable the L1 data cache and exit SMP */ bl tegra_disable_clean_inv_dcache mov32 r3, tegra_shut_off_mmu add r3, r3, r0 mov32 r0, tegra20_tear_down_core mov32 r1, tegra20_iram_start sub r0, r0, r1 mov32 r1, TEGRA_IRAM_LPx_RESUME_AREA add r0, r0, r1 ret r3 ENDPROC(tegra20_sleep_core_finish) /* * tegra20_sleep_cpu_secondary_finish(unsigned long v2p) * * Enters WFI on secondary CPU by exiting coherency. */ ENTRY(tegra20_sleep_cpu_secondary_finish) stmfd sp!, {r4-r11, lr} mrc p15, 0, r11, c1, c0, 1 @ save actlr before exiting coherency /* Flush and disable the L1 data cache */ mov r0, #TEGRA_FLUSH_CACHE_LOUIS bl tegra_disable_clean_inv_dcache mov32 r0, TEGRA_IRAM_RESET_BASE_VIRT ldr r4, =__tegra20_cpu1_resettable_status_offset mov r3, #CPU_RESETTABLE strb r3, [r0, r4] bl tegra_cpu_do_idle /* * cpu may be reset while in wfi, which will return through * tegra_resume to cpu_resume * or interrupt may wake wfi, which will return here * cpu state is unchanged - MMU is on, cache is on, coherency * is off, and the data cache is off * * r11 contains the original actlr */ bl tegra_pen_lock mov32 r0, TEGRA_IRAM_RESET_BASE_VIRT ldr r4, =__tegra20_cpu1_resettable_status_offset mov r3, #CPU_NOT_RESETTABLE strb r3, [r0, r4] bl tegra_pen_unlock /* Re-enable the data cache */ mrc p15, 0, r10, c1, c0, 0 orr r10, r10, #CR_C mcr p15, 0, r10, c1, c0, 0 isb mcr p15, 0, r11, c1, c0, 1 @ reenable coherency /* Invalidate the TLBs & BTAC */ mov r1, #0 mcr p15, 0, r1, c8, c3, 0 @ invalidate shared TLBs mcr p15, 0, r1, c7, c1, 6 @ invalidate shared BTAC dsb isb /* the cpu was running with coherency disabled, * caches may be out of date */ bl v7_flush_kern_cache_louis ldmfd sp!, {r4 - r11, pc} ENDPROC(tegra20_sleep_cpu_secondary_finish) /* * tegra20_tear_down_cpu * * Switches the CPU cluster to PLL-P and enters sleep. */ ENTRY(tegra20_tear_down_cpu) bl tegra_switch_cpu_to_pllp b tegra20_enter_sleep ENDPROC(tegra20_tear_down_cpu) /* START OF ROUTINES COPIED TO IRAM */ .align L1_CACHE_SHIFT .globl tegra20_iram_start tegra20_iram_start: /* * tegra20_lp1_reset * * reset vector for LP1 restore; copied into IRAM during suspend. * Brings the system back up to a safe staring point (SDRAM out of * self-refresh, PLLC, PLLM and PLLP reenabled, CPU running on PLLP, * system clock running on the same PLL that it suspended at), and * jumps to tegra_resume to restore virtual addressing and PLLX. * The physical address of tegra_resume expected to be stored in * PMC_SCRATCH41. * * NOTE: THIS *MUST* BE RELOCATED TO TEGRA_IRAM_LPx_RESUME_AREA. */ ENTRY(tegra20_lp1_reset) /* * The CPU and system bus are running at 32KHz and executing from * IRAM when this code is executed; immediately switch to CLKM and * enable PLLM, PLLP, PLLC. */ mov32 r0, TEGRA_CLK_RESET_BASE mov r1, #(1 << 28) str r1, [r0, #CLK_RESET_SCLK_BURST] str r1, [r0, #CLK_RESET_CCLK_BURST] mov r1, #0 str r1, [r0, #CLK_RESET_CCLK_DIVIDER] str r1, [r0, #CLK_RESET_SCLK_DIVIDER] pll_enable r1, r0, CLK_RESET_PLLM_BASE pll_enable r1, r0, CLK_RESET_PLLP_BASE pll_enable r1, r0, CLK_RESET_PLLC_BASE adr r2, tegra20_sdram_pad_address adr r4, tegra20_sdram_pad_save mov r5, #0 ldr r6, tegra20_sdram_pad_size padload: ldr r7, [r2, r5] @ r7 is the addr in the pad_address ldr r1, [r4, r5] str r1, [r7] @ restore the value in pad_save add r5, r5, #4 cmp r6, r5 bne padload padload_done: /* 255uS delay for PLL stabilization */ mov32 r7, TEGRA_TMRUS_BASE ldr r1, [r7] add r1, r1, #0xff wait_until r1, r7, r9 adr r4, tegra20_sclk_save ldr r4, [r4] str r4, [r0, #CLK_RESET_SCLK_BURST] mov32 r4, ((1 << 28) | (4)) @ burst policy is PLLP str r4, [r0, #CLK_RESET_CCLK_BURST] mov32 r0, TEGRA_EMC_BASE ldr r1, [r0, #EMC_CFG] bic r1, r1, #(1 << 31) @ disable DRAM_CLK_STOP str r1, [r0, #EMC_CFG] mov r1, #0 str r1, [r0, #EMC_SELF_REF] @ take DRAM out of self refresh mov r1, #1 str r1, [r0, #EMC_NOP] str r1, [r0, #EMC_NOP] str r1, [r0, #EMC_REFRESH] emc_device_mask r1, r0 exit_selfrefresh_loop: ldr r2, [r0, #EMC_EMC_STATUS] ands r2, r2, r1 bne exit_selfrefresh_loop mov r1, #0 @ unstall all transactions str r1, [r0, #EMC_REQ_CTRL] mov32 r0, TEGRA_PMC_BASE ldr r0, [r0, #PMC_SCRATCH41] ret r0 @ jump to tegra_resume ENDPROC(tegra20_lp1_reset) /* * tegra20_tear_down_core * * copied into and executed from IRAM * puts memory in self-refresh for LP0 and LP1 */ tegra20_tear_down_core: bl tegra20_sdram_self_refresh bl tegra20_switch_cpu_to_clk32k b tegra20_enter_sleep /* * tegra20_switch_cpu_to_clk32k * * In LP0 and LP1 all PLLs will be turned off. Switch the CPU and system clock * to the 32KHz clock. */ tegra20_switch_cpu_to_clk32k: /* * start by switching to CLKM to safely disable PLLs, then switch to * CLKS. */ mov r0, #(1 << 28) str r0, [r5, #CLK_RESET_SCLK_BURST] str r0, [r5, #CLK_RESET_CCLK_BURST] mov r0, #0 str r0, [r5, #CLK_RESET_CCLK_DIVIDER] str r0, [r5, #CLK_RESET_SCLK_DIVIDER] /* 2uS delay delay between changing SCLK and disabling PLLs */ mov32 r7, TEGRA_TMRUS_BASE ldr r1, [r7] add r1, r1, #2 wait_until r1, r7, r9 /* disable PLLM, PLLP and PLLC */ ldr r0, [r5, #CLK_RESET_PLLM_BASE] bic r0, r0, #(1 << 30) str r0, [r5, #CLK_RESET_PLLM_BASE] ldr r0, [r5, #CLK_RESET_PLLP_BASE] bic r0, r0, #(1 << 30) str r0, [r5, #CLK_RESET_PLLP_BASE] ldr r0, [r5, #CLK_RESET_PLLC_BASE] bic r0, r0, #(1 << 30) str r0, [r5, #CLK_RESET_PLLC_BASE] /* switch to CLKS */ mov r0, #0 /* brust policy = 32KHz */ str r0, [r5, #CLK_RESET_SCLK_BURST] ret lr /* * tegra20_enter_sleep * * uses flow controller to enter sleep state * executes from IRAM with SDRAM in selfrefresh when target state is LP0 or LP1 * executes from SDRAM with target state is LP2 */ tegra20_enter_sleep: mov32 r6, TEGRA_FLOW_CTRL_BASE mov r0, #FLOW_CTRL_WAIT_FOR_INTERRUPT orr r0, r0, #FLOW_CTRL_HALT_CPU_IRQ | FLOW_CTRL_HALT_CPU_FIQ cpu_id r1 cpu_to_halt_reg r1, r1 str r0, [r6, r1] dsb ldr r0, [r6, r1] /* memory barrier */ halted: dsb wfe /* CPU should be power gated here */ isb b halted /* * tegra20_sdram_self_refresh * * called with MMU off and caches disabled * puts sdram in self refresh * must be executed from IRAM */ tegra20_sdram_self_refresh: mov32 r1, TEGRA_EMC_BASE @ r1 reserved for emc base addr mov r2, #3 str r2, [r1, #EMC_REQ_CTRL] @ stall incoming DRAM requests emcidle: ldr r2, [r1, #EMC_EMC_STATUS] tst r2, #4 beq emcidle mov r2, #1 str r2, [r1, #EMC_SELF_REF] emc_device_mask r2, r1 emcself: ldr r3, [r1, #EMC_EMC_STATUS] and r3, r3, r2 cmp r3, r2 bne emcself @ loop until DDR in self-refresh adr r2, tegra20_sdram_pad_address adr r3, tegra20_sdram_pad_safe adr r4, tegra20_sdram_pad_save mov r5, #0 ldr r6, tegra20_sdram_pad_size padsave: ldr r0, [r2, r5] @ r0 is the addr in the pad_address ldr r1, [r0] str r1, [r4, r5] @ save the content of the addr ldr r1, [r3, r5] str r1, [r0] @ set the save val to the addr add r5, r5, #4 cmp r6, r5 bne padsave padsave_done: mov32 r5, TEGRA_CLK_RESET_BASE ldr r0, [r5, #CLK_RESET_SCLK_BURST] adr r2, tegra20_sclk_save str r0, [r2] dsb ret lr tegra20_sdram_pad_address: .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGCPADCTRL .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGDPADCTRL .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CLKCFGPADCTRL .word TEGRA_APB_MISC_BASE + APB_MISC_XM2COMPPADCTRL .word TEGRA_APB_MISC_BASE + APB_MISC_XM2VTTGENPADCTRL .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGCPADCTRL2 .word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGDPADCTRL2 tegra20_sdram_pad_size: .word tegra20_sdram_pad_size - tegra20_sdram_pad_address tegra20_sdram_pad_safe: .word 0x8 .word 0x8 .word 0x0 .word 0x8 .word 0x5500 .word 0x08080040 .word 0x0 tegra20_sclk_save: .word 0x0 tegra20_sdram_pad_save: .rept (tegra20_sdram_pad_size - tegra20_sdram_pad_address) / 4 .long 0 .endr .ltorg /* dummy symbol for end of IRAM */ .align L1_CACHE_SHIFT .globl tegra20_iram_end tegra20_iram_end: b . #endif