[PATCH V3 5/8] ARM: tegra: add LP1 suspend support for Tegra30
Joseph Lo
josephl at nvidia.com
Mon Aug 12 05:40:04 EDT 2013
The LP1 suspend mode will power off the CPU, clock gated the PLLs and put
SDRAM to self-refresh mode. Any interrupt can wake up device from LP1. The
sequence when LP1 suspending:
* tunning off L1 data cache and the MMU
* storing some EMC registers, DPD (deep power down) status, clk source of
mselect and SCLK burst policy
* putting SDRAM into self-refresh
* switching CPU to CLK_M (12MHz OSC)
* tunning off PLLM, PLLP, PLLA, PLLC and PLLX
* switching SCLK to CLK_S (32KHz OSC)
* shutting off the CPU rail
The sequence of LP1 resuming:
* re-enabling PLLM, PLLP, PLLA, PLLC and PLLX
* restoring the clk source of mselect and SCLK burst policy
* setting up CCLK burst policy to PLLX
* restoring DPD status and some EMC registers
* resuming SDRAM to normal mode
* jumping to the "tegra_resume" from PMC_SCRATCH41
Due to the SDRAM will be put into self-refresh mode, the low level
procedures of LP1 suspending and resuming should be copied to
TEGRA_IRAM_CODE_AREA (TEGRA_IRAM_BASE + SZ_4K) when suspending. Before
restoring the CPU context when resuming, the SDRAM needs to be switched
back to normal mode. And the PLLs need to be re-enabled, SCLK burst policy
be restored, CCLK burst policy be set in PLLX. Then jumping to
"tegra_resume" that was expected to be stored in PMC_SCRATCH41 to restore
CPU context and back to kernel.
Based on the work by: Scott Williams <scwilliams at nvidia.com>
Signed-off-by: Joseph Lo <josephl at nvidia.com>
---
V3:
* remove the no meaning message "AND MUST BE FIRST"
V2:
* remove wait_for_us
* using IS_ENABLE for SoC specific code
* calculating "tegra30_sdram_pad_save" by assemby symbol
---
arch/arm/mach-tegra/Makefile | 1 +
arch/arm/mach-tegra/pm-tegra30.c | 34 +++
arch/arm/mach-tegra/pm.c | 18 ++
arch/arm/mach-tegra/pm.h | 3 +
arch/arm/mach-tegra/sleep-tegra30.S | 492 ++++++++++++++++++++++++++++++++++++
arch/arm/mach-tegra/sleep.S | 8 +-
arch/arm/mach-tegra/sleep.h | 8 +
7 files changed, 560 insertions(+), 4 deletions(-)
create mode 100644 arch/arm/mach-tegra/pm-tegra30.c
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 98b184e..d341980 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += cpuidle-tegra20.o
endif
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += tegra30_speedo.o
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += sleep-tegra30.o
+obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += pm-tegra30.o
ifeq ($(CONFIG_CPU_IDLE),y)
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += cpuidle-tegra30.o
endif
diff --git a/arch/arm/mach-tegra/pm-tegra30.c b/arch/arm/mach-tegra/pm-tegra30.c
new file mode 100644
index 0000000..8fa326d
--- /dev/null
+++ b/arch/arm/mach-tegra/pm-tegra30.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+
+#include "pm.h"
+
+#ifdef CONFIG_PM_SLEEP
+extern u32 tegra30_iram_start, tegra30_iram_end;
+extern void tegra30_sleep_core_finish(unsigned long);
+
+void tegra30_lp1_iram_hook(void)
+{
+ tegra_lp1_iram.start_addr = &tegra30_iram_start;
+ tegra_lp1_iram.end_addr = &tegra30_iram_end;
+}
+
+void tegra30_sleep_core_init(void)
+{
+ tegra_sleep_core_finish = tegra30_sleep_core_finish;
+}
+#endif
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index d12385f..d557159 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -210,6 +210,15 @@ static int tegra_sleep_core(unsigned long v2p)
*/
static bool tegra_lp1_iram_hook(void)
{
+ switch (tegra_chip_id) {
+ case TEGRA30:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC))
+ tegra30_lp1_iram_hook();
+ break;
+ default:
+ break;
+ }
+
if (!tegra_lp1_iram.start_addr || !tegra_lp1_iram.end_addr)
return false;
@@ -223,6 +232,15 @@ static bool tegra_lp1_iram_hook(void)
static bool tegra_sleep_core_init(void)
{
+ switch (tegra_chip_id) {
+ case TEGRA30:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC))
+ tegra30_sleep_core_init();
+ break;
+ default:
+ break;
+ }
+
if (!tegra_sleep_core_finish)
return false;
diff --git a/arch/arm/mach-tegra/pm.h b/arch/arm/mach-tegra/pm.h
index 478706e..803bd53 100644
--- a/arch/arm/mach-tegra/pm.h
+++ b/arch/arm/mach-tegra/pm.h
@@ -30,6 +30,9 @@ struct tegra_lp1_iram {
extern struct tegra_lp1_iram tegra_lp1_iram;
extern void (*tegra_sleep_core_finish)(unsigned long v2p);
+void tegra30_lp1_iram_hook(void);
+void tegra30_sleep_core_init(void);
+
extern unsigned long l2x0_saved_regs_addr;
void save_cpu_arch_register(void);
diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S
index ecad4ea..2be7f70 100644
--- a/arch/arm/mach-tegra/sleep-tegra30.S
+++ b/arch/arm/mach-tegra/sleep-tegra30.S
@@ -18,13 +18,102 @@
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
+#include <asm/cache.h>
#include "fuse.h"
#include "sleep.h"
#include "flowctrl.h"
+#define EMC_CFG 0xc
+#define EMC_ADR_CFG 0x10
+#define EMC_TIMING_CONTROL 0x28
+#define EMC_REFRESH 0x70
+#define EMC_NOP 0xdc
+#define EMC_SELF_REF 0xe0
+#define EMC_MRW 0xe8
+#define EMC_FBIO_CFG5 0x104
+#define EMC_AUTO_CAL_CONFIG 0x2a4
+#define EMC_AUTO_CAL_INTERVAL 0x2a8
+#define EMC_AUTO_CAL_STATUS 0x2ac
+#define EMC_REQ_CTRL 0x2b0
+#define EMC_CFG_DIG_DLL 0x2bc
+#define EMC_EMC_STATUS 0x2b4
+#define EMC_ZCAL_INTERVAL 0x2e0
+#define EMC_ZQ_CAL 0x2ec
+#define EMC_XM2VTTGENPADCTRL 0x310
+#define EMC_XM2VTTGENPADCTRL2 0x314
+
+#define PMC_CTRL 0x0
+#define PMC_CTRL_SIDE_EFFECT_LP0 (1 << 14) /* enter LP0 when CPU pwr gated */
+
+#define PMC_PLLP_WB0_OVERRIDE 0xf8
+#define PMC_IO_DPD_REQ 0x1b8
+#define PMC_IO_DPD_STATUS 0x1bc
+
+#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_PLLC_MISC 0x8c
+#define CLK_RESET_PLLM_BASE 0x90
+#define CLK_RESET_PLLM_MISC 0x9c
+#define CLK_RESET_PLLP_BASE 0xa0
+#define CLK_RESET_PLLP_MISC 0xac
+#define CLK_RESET_PLLA_BASE 0xb0
+#define CLK_RESET_PLLA_MISC 0xbc
+#define CLK_RESET_PLLX_BASE 0xe0
+#define CLK_RESET_PLLX_MISC 0xe4
+
+#define CLK_RESET_CLK_SOURCE_MSELECT 0x3b4
+
+#define MSELECT_CLKM (0x3 << 30)
+
+#define LOCK_DELAY 50 /* safety delay after lock is detected */
+
#define TEGRA30_POWER_HOTPLUG_SHUTDOWN (1 << 27) /* Hotplug shutdown */
+.macro emc_device_mask, rd, base
+ ldr \rd, [\base, #EMC_ADR_CFG]
+ tst \rd, #0x1
+ moveq \rd, #(0x1 << 8) @ just 1 device
+ movne \rd, #(0x3 << 8) @ 2 devices
+.endm
+
+.macro emc_timing_update, rd, base
+ mov \rd, #1
+ str \rd, [\base, #EMC_TIMING_CONTROL]
+1001:
+ ldr \rd, [\base, #EMC_EMC_STATUS]
+ tst \rd, #(0x1<<23) @ wait EMC_STATUS_TIMING_UPDATE_STALLED is clear
+ bne 1001b
+.endm
+
+.macro pll_enable, rd, r_car_base, pll_base, pll_misc
+ ldr \rd, [\r_car_base, #\pll_base]
+ tst \rd, #(1 << 30)
+ orreq \rd, \rd, #(1 << 30)
+ streq \rd, [\r_car_base, #\pll_base]
+ /* Enable lock detector */
+ .if \pll_misc
+ ldr \rd, [\r_car_base, #\pll_misc]
+ bic \rd, \rd, #(1 << 18)
+ str \rd, [\r_car_base, #\pll_misc]
+ ldr \rd, [\r_car_base, #\pll_misc]
+ ldr \rd, [\r_car_base, #\pll_misc]
+ orr \rd, \rd, #(1 << 18)
+ str \rd, [\r_car_base, #\pll_misc]
+ .endif
+.endm
+
+.macro pll_locked, rd, r_car_base, pll_base
+1:
+ ldr \rd, [\r_car_base, #\pll_base]
+ tst \rd, #(1 << 27)
+ beq 1b
+.endm
+
#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
/*
* tegra30_hotplug_shutdown(void)
@@ -129,6 +218,41 @@ ENDPROC(tegra30_cpu_shutdown)
#ifdef CONFIG_PM_SLEEP
/*
+ * tegra30_sleep_core_finish(unsigned long v2p)
+ *
+ * Enters suspend in LP0 or LP1 by turning off the MMU and jumping to
+ * tegra30_tear_down_core in IRAM
+ */
+ENTRY(tegra30_sleep_core_finish)
+ /* Flush, disable the L1 data cache and exit SMP */
+ bl tegra_disable_clean_inv_dcache
+
+ /*
+ * Preload all the address literals that are needed for the
+ * CPU power-gating process, to avoid loading from SDRAM which
+ * are not supported once SDRAM is put into self-refresh.
+ * LP0 / LP1 use physical address, since the MMU needs to be
+ * disabled before putting SDRAM into self-refresh to avoid
+ * memory access due to page table walks.
+ */
+ mov32 r4, TEGRA_PMC_BASE
+ mov32 r5, TEGRA_CLK_RESET_BASE
+ mov32 r6, TEGRA_FLOW_CTRL_BASE
+ mov32 r7, TEGRA_TMRUS_BASE
+
+ mov32 r3, tegra_shut_off_mmu
+ add r3, r3, r0
+
+ mov32 r0, tegra30_tear_down_core
+ mov32 r1, tegra30_iram_start
+ sub r0, r0, r1
+ mov32 r1, TEGRA_IRAM_CODE_AREA
+ add r0, r0, r1
+
+ mov pc, r3
+ENDPROC(tegra30_sleep_core_finish)
+
+/*
* tegra30_sleep_cpu_secondary_finish(unsigned long v2p)
*
* Enters LP2 on secondary CPU by exiting coherency and powergating the CPU.
@@ -158,6 +282,273 @@ ENTRY(tegra30_tear_down_cpu)
b tegra30_enter_sleep
ENDPROC(tegra30_tear_down_cpu)
+/* START OF ROUTINES COPIED TO IRAM */
+ .align L1_CACHE_SHIFT
+ .globl tegra30_iram_start
+tegra30_iram_start:
+
+/*
+ * tegra30_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 PLLX,
+ * system clock running on the same PLL that it suspended at), and
+ * jumps to tegra_resume to restore virtual addressing.
+ * The physical address of tegra_resume expected to be stored in
+ * PMC_SCRATCH41.
+ *
+ * NOTE: THIS *MUST* BE RELOCATED TO TEGRA_IRAM_CODE_AREA.
+ */
+ENTRY(tegra30_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 PLLP, PLLM, PLLC, PLLA and PLLX.
+ */
+ 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]
+
+ /* enable PLLM via PMC */
+ mov32 r2, TEGRA_PMC_BASE
+ ldr r1, [r2, #PMC_PLLP_WB0_OVERRIDE]
+ orr r1, r1, #(1 << 12)
+ str r1, [r2, #PMC_PLLP_WB0_OVERRIDE]
+
+ pll_enable r1, r0, CLK_RESET_PLLM_BASE, CLK_RESET_PLLM_MISC
+ pll_enable r1, r0, CLK_RESET_PLLP_BASE, CLK_RESET_PLLP_MISC
+ pll_enable r1, r0, CLK_RESET_PLLA_BASE, CLK_RESET_PLLA_MISC
+ pll_enable r1, r0, CLK_RESET_PLLC_BASE, CLK_RESET_PLLC_MISC
+ pll_enable r1, r0, CLK_RESET_PLLX_BASE, CLK_RESET_PLLX_MISC
+
+ pll_locked r1, r0, CLK_RESET_PLLM_BASE
+ pll_locked r1, r0, CLK_RESET_PLLP_BASE
+ pll_locked r1, r0, CLK_RESET_PLLA_BASE
+ pll_locked r1, r0, CLK_RESET_PLLC_BASE
+ pll_locked r1, r0, CLK_RESET_PLLX_BASE
+
+ mov32 r7, TEGRA_TMRUS_BASE
+ ldr r1, [r7]
+ add r1, r1, #LOCK_DELAY
+ wait_until r1, r7, r3
+
+ adr r5, tegra30_sdram_pad_save
+
+ ldr r4, [r5, #0x18] @ restore CLK_SOURCE_MSELECT
+ str r4, [r0, #CLK_RESET_CLK_SOURCE_MSELECT]
+
+ ldr r4, [r5, #0x1C] @ restore SCLK_BURST
+ str r4, [r0, #CLK_RESET_SCLK_BURST]
+
+ mov32 r4, ((1 << 28) | (0x8)) @ burst policy is PLLX
+ str r4, [r0, #CLK_RESET_CCLK_BURST]
+
+ /* Restore pad power state to normal */
+ ldr r1, [r5, #0x14] @ PMC_IO_DPD_STATUS
+ mvn r1, r1
+ bic r1, r1, #(1 << 31)
+ orr r1, r1, #(1 << 30)
+ str r1, [r2, #PMC_IO_DPD_REQ] @ DPD_OFF
+
+ mov32 r0, TEGRA_EMC_BASE @ r0 reserved for emc base
+
+ ldr r1, [r5, #0xC] @ restore EMC_XM2VTTGENPADCTRL
+ str r1, [r0, #EMC_XM2VTTGENPADCTRL]
+ ldr r1, [r5, #0x10] @ restore EMC_XM2VTTGENPADCTRL2
+ str r1, [r0, #EMC_XM2VTTGENPADCTRL2]
+ ldr r1, [r5, #0x8] @ restore EMC_AUTO_CAL_INTERVAL
+ str r1, [r0, #EMC_AUTO_CAL_INTERVAL]
+
+ /* Relock DLL */
+ ldr r1, [r0, #EMC_CFG_DIG_DLL]
+ orr r1, r1, #(1 << 30) @ set DLL_RESET
+ str r1, [r0, #EMC_CFG_DIG_DLL]
+
+ emc_timing_update r1, r0
+
+ ldr r1, [r0, #EMC_AUTO_CAL_CONFIG]
+ orr r1, r1, #(1 << 31) @ set AUTO_CAL_ACTIVE
+ str r1, [r0, #EMC_AUTO_CAL_CONFIG]
+
+emc_wait_auto_cal_onetime:
+ ldr r1, [r0, #EMC_AUTO_CAL_STATUS]
+ tst r1, #(1 << 31) @ wait until AUTO_CAL_ACTIVE is cleared
+ bne emc_wait_auto_cal_onetime
+
+ ldr r1, [r0, #EMC_CFG]
+ bic r1, r1, #(1 << 31) @ disable DRAM_CLK_STOP_PD
+ 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
+
+ lsr r1, r1, #8 @ devSel, bit0:dev0, bit1:dev1
+
+ mov32 r7, TEGRA_TMRUS_BASE
+ ldr r2, [r0, #EMC_FBIO_CFG5]
+
+ and r2, r2, #3 @ check DRAM_TYPE
+ cmp r2, #2
+ beq emc_lpddr2
+
+ /* Issue a ZQ_CAL for dev0 - DDR3 */
+ mov32 r2, 0x80000011 @ DEV_SELECTION=2, LENGTH=LONG, CMD=1
+ str r2, [r0, #EMC_ZQ_CAL]
+ ldr r2, [r7]
+ add r2, r2, #10
+ wait_until r2, r7, r3
+
+ tst r1, #2
+ beq zcal_done
+
+ /* Issue a ZQ_CAL for dev1 - DDR3 */
+ mov32 r2, 0x40000011 @ DEV_SELECTION=1, LENGTH=LONG, CMD=1
+ str r2, [r0, #EMC_ZQ_CAL]
+ ldr r2, [r7]
+ add r2, r2, #10
+ wait_until r2, r7, r3
+ b zcal_done
+
+emc_lpddr2:
+ /* Issue a ZQ_CAL for dev0 - LPDDR2 */
+ mov32 r2, 0x800A00AB @ DEV_SELECTION=2, MA=10, OP=0xAB
+ str r2, [r0, #EMC_MRW]
+ ldr r2, [r7]
+ add r2, r2, #1
+ wait_until r2, r7, r3
+
+ tst r1, #2
+ beq zcal_done
+
+ /* Issue a ZQ_CAL for dev0 - LPDDR2 */
+ mov32 r2, 0x400A00AB @ DEV_SELECTION=1, MA=10, OP=0xAB
+ str r2, [r0, #EMC_MRW]
+ ldr r2, [r7]
+ add r2, r2, #1
+ wait_until r2, r7, r3
+
+zcal_done:
+ mov r1, #0 @ unstall all transactions
+ str r1, [r0, #EMC_REQ_CTRL]
+ ldr r1, [r5, #0x4] @ restore EMC_ZCAL_INTERVAL
+ str r1, [r0, #EMC_ZCAL_INTERVAL]
+ ldr r1, [r5, #0x0] @ restore EMC_CFG
+ str r1, [r0, #EMC_CFG]
+
+ mov32 r0, TEGRA_PMC_BASE
+ ldr r0, [r0, #PMC_SCRATCH41]
+ mov pc, r0 @ jump to tegra_resume
+ENDPROC(tegra30_lp1_reset)
+
+ .align L1_CACHE_SHIFT
+tegra30_sdram_pad_address:
+ .word TEGRA_EMC_BASE + EMC_CFG @0x0
+ .word TEGRA_EMC_BASE + EMC_ZCAL_INTERVAL @0x4
+ .word TEGRA_EMC_BASE + EMC_AUTO_CAL_INTERVAL @0x8
+ .word TEGRA_EMC_BASE + EMC_XM2VTTGENPADCTRL @0xc
+ .word TEGRA_EMC_BASE + EMC_XM2VTTGENPADCTRL2 @0x10
+ .word TEGRA_PMC_BASE + PMC_IO_DPD_STATUS @0x14
+ .word TEGRA_CLK_RESET_BASE + CLK_RESET_CLK_SOURCE_MSELECT @0x18
+ .word TEGRA_CLK_RESET_BASE + CLK_RESET_SCLK_BURST @0x1c
+
+tegra30_sdram_pad_size:
+ .word tegra30_sdram_pad_size - tegra30_sdram_pad_address
+
+ .type tegra30_sdram_pad_save, %object
+tegra30_sdram_pad_save:
+ .rept (tegra30_sdram_pad_size - tegra30_sdram_pad_address) / 4
+ .long 0
+ .endr
+
+/*
+ * tegra30_tear_down_core
+ *
+ * copied into and executed from IRAM
+ * puts memory in self-refresh for LP0 and LP1
+ */
+tegra30_tear_down_core:
+ bl tegra30_sdram_self_refresh
+ bl tegra30_switch_cpu_to_clk32k
+ b tegra30_enter_sleep
+
+/*
+ * tegra30_switch_cpu_to_clk32k
+ *
+ * In LP0 and LP1 all PLLs will be turned off. Switching the CPU and System CLK
+ * to the 32KHz clock.
+ * r4 = TEGRA_PMC_BASE
+ * r5 = TEGRA_CLK_RESET_BASE
+ * r6 = TEGRA_FLOW_CTRL_BASE
+ * r7 = TEGRA_TMRUS_BASE
+ */
+tegra30_switch_cpu_to_clk32k:
+ /*
+ * start by jumping to CLKM to safely disable PLLs, then jump to
+ * CLKS.
+ */
+ mov r0, #(1 << 28)
+ str r0, [r5, #CLK_RESET_SCLK_BURST]
+ /* 2uS delay delay between changing SCLK and CCLK */
+ ldr r1, [r7]
+ add r1, r1, #2
+ wait_until r1, r7, r9
+ str r0, [r5, #CLK_RESET_CCLK_BURST]
+ mov r0, #0
+ str r0, [r5, #CLK_RESET_CCLK_DIVIDER]
+ str r0, [r5, #CLK_RESET_SCLK_DIVIDER]
+
+ /* switch the clock source of mselect to be CLK_M */
+ ldr r0, [r5, #CLK_RESET_CLK_SOURCE_MSELECT]
+ orr r0, r0, #MSELECT_CLKM
+ str r0, [r5, #CLK_RESET_CLK_SOURCE_MSELECT]
+
+ /* 2uS delay delay between changing SCLK and disabling PLLs */
+ ldr r1, [r7]
+ add r1, r1, #2
+ wait_until r1, r7, r9
+
+ /* disable PLLM via PMC in LP1 */
+ ldr r0, [r4, #PMC_PLLP_WB0_OVERRIDE]
+ bic r0, r0, #(1 << 12)
+ str r0, [r4, #PMC_PLLP_WB0_OVERRIDE]
+
+ /* disable PLLP, PLLA, PLLC and PLLX */
+ ldr r0, [r5, #CLK_RESET_PLLP_BASE]
+ bic r0, r0, #(1 << 30)
+ str r0, [r5, #CLK_RESET_PLLP_BASE]
+ ldr r0, [r5, #CLK_RESET_PLLA_BASE]
+ bic r0, r0, #(1 << 30)
+ str r0, [r5, #CLK_RESET_PLLA_BASE]
+ ldr r0, [r5, #CLK_RESET_PLLC_BASE]
+ bic r0, r0, #(1 << 30)
+ str r0, [r5, #CLK_RESET_PLLC_BASE]
+ ldr r0, [r5, #CLK_RESET_PLLX_BASE]
+ bic r0, r0, #(1 << 30)
+ str r0, [r5, #CLK_RESET_PLLX_BASE]
+
+ /* switch to CLKS */
+ mov r0, #0 /* brust policy = 32KHz */
+ str r0, [r5, #CLK_RESET_SCLK_BURST]
+
+ mov pc, lr
+
/*
* tegra30_enter_sleep
*
@@ -194,4 +585,105 @@ halted:
/* !!!FIXME!!! Implement halt failure handler */
b halted
+/*
+ * tegra30_sdram_self_refresh
+ *
+ * called with MMU off and caches disabled
+ * must be executed from IRAM
+ * r4 = TEGRA_PMC_BASE
+ * r5 = TEGRA_CLK_RESET_BASE
+ * r6 = TEGRA_FLOW_CTRL_BASE
+ * r7 = TEGRA_TMRUS_BASE
+ */
+tegra30_sdram_self_refresh:
+
+ adr r2, tegra30_sdram_pad_address
+ adr r8, tegra30_sdram_pad_save
+ mov r9, #0
+
+ ldr r3, tegra30_sdram_pad_size
+padsave:
+ ldr r0, [r2, r9] @ r0 is the addr in the pad_address
+
+ ldr r1, [r0]
+ str r1, [r8, r9] @ save the content of the addr
+
+ add r9, r9, #4
+ cmp r3, r9
+ bne padsave
+padsave_done:
+
+ dsb
+
+ mov32 r0, TEGRA_EMC_BASE @ r0 reserved for emc base addr
+
+ mov r1, #0
+ str r1, [r0, #EMC_ZCAL_INTERVAL]
+ str r1, [r0, #EMC_AUTO_CAL_INTERVAL]
+ ldr r1, [r0, #EMC_CFG]
+ bic r1, r1, #(1 << 28)
+ str r1, [r0, #EMC_CFG] @ disable DYN_SELF_REF
+
+ emc_timing_update r1, r0
+
+ ldr r1, [r7]
+ add r1, r1, #5
+ wait_until r1, r7, r2
+
+emc_wait_auto_cal:
+ ldr r1, [r0, #EMC_AUTO_CAL_STATUS]
+ tst r1, #(1 << 31) @ wait until AUTO_CAL_ACTIVE is cleared
+ bne emc_wait_auto_cal
+
+ mov r1, #3
+ str r1, [r0, #EMC_REQ_CTRL] @ stall incoming DRAM requests
+
+emcidle:
+ ldr r1, [r0, #EMC_EMC_STATUS]
+ tst r1, #4
+ beq emcidle
+
+ mov r1, #1
+ str r1, [r0, #EMC_SELF_REF]
+
+ emc_device_mask r1, r0
+
+emcself:
+ ldr r2, [r0, #EMC_EMC_STATUS]
+ and r2, r2, r1
+ cmp r2, r1
+ bne emcself @ loop until DDR in self-refresh
+
+ /* Put VTTGEN in the lowest power mode */
+ ldr r1, [r0, #EMC_XM2VTTGENPADCTRL]
+ mov32 r2, 0xF8F8FFFF @ clear XM2VTTGEN_DRVUP and XM2VTTGEN_DRVDN
+ and r1, r1, r2
+ str r1, [r0, #EMC_XM2VTTGENPADCTRL]
+ ldr r1, [r0, #EMC_XM2VTTGENPADCTRL2]
+ orr r1, r1, #7 @ set E_NO_VTTGEN
+ str r1, [r0, #EMC_XM2VTTGENPADCTRL2]
+
+ emc_timing_update r1, r0
+
+ ldr r1, [r4, #PMC_CTRL]
+ tst r1, #PMC_CTRL_SIDE_EFFECT_LP0
+ bne pmc_io_dpd_skip
+ /*
+ * Put DDR_DATA, DISC_ADDR_CMD, DDR_ADDR_CMD, POP_ADDR_CMD, POP_CLK
+ * and COMP in the lowest power mode when LP1.
+ */
+ mov32 r1, 0x8EC00000
+ str r1, [r4, #PMC_IO_DPD_REQ]
+pmc_io_dpd_skip:
+
+ dsb
+
+ mov pc, lr
+
+ .ltorg
+/* dummy symbol for end of IRAM */
+ .align L1_CACHE_SHIFT
+ .global tegra30_iram_end
+tegra30_iram_end:
+ b .
#endif
diff --git a/arch/arm/mach-tegra/sleep.S b/arch/arm/mach-tegra/sleep.S
index 8388113..8d06213 100644
--- a/arch/arm/mach-tegra/sleep.S
+++ b/arch/arm/mach-tegra/sleep.S
@@ -134,10 +134,10 @@ ENTRY(tegra_shut_off_mmu)
#ifdef CONFIG_CACHE_L2X0
/* Disable L2 cache */
check_cpu_part_num 0xc09, r9, r10
- movweq r4, #:lower16:(TEGRA_ARM_PERIF_BASE + 0x3000)
- movteq r4, #:upper16:(TEGRA_ARM_PERIF_BASE + 0x3000)
- moveq r5, #0
- streq r5, [r4, #L2X0_CTRL]
+ movweq r2, #:lower16:(TEGRA_ARM_PERIF_BASE + 0x3000)
+ movteq r2, #:upper16:(TEGRA_ARM_PERIF_BASE + 0x3000)
+ moveq r3, #0
+ streq r3, [r2, #L2X0_CTRL]
#endif
mov pc, r0
ENDPROC(tegra_shut_off_mmu)
diff --git a/arch/arm/mach-tegra/sleep.h b/arch/arm/mach-tegra/sleep.h
index e907e40..a4edbb3 100644
--- a/arch/arm/mach-tegra/sleep.h
+++ b/arch/arm/mach-tegra/sleep.h
@@ -46,6 +46,14 @@
#define TEGRA_FLUSH_CACHE_ALL 1
#ifdef __ASSEMBLY__
+/* waits until the microsecond counter (base) is > rn */
+.macro wait_until, rn, base, tmp
+ add \rn, \rn, #1
+1001: ldr \tmp, [\base]
+ cmp \tmp, \rn
+ bmi 1001b
+.endm
+
/* returns the offset of the flow controller halt register for a cpu */
.macro cpu_to_halt_reg rd, rcpu
cmp \rcpu, #0
--
1.8.3.4
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