Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are met: |
| 6 | * |
| 7 | * Redistributions of source code must retain the above copyright notice, this |
| 8 | * list of conditions and the following disclaimer. |
| 9 | * |
| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * Neither the name of ARM nor the names of its contributors may be used |
| 15 | * to endorse or promote products derived from this software without specific |
| 16 | * prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include <arch_helpers.h> |
| 32 | #include <assert.h> |
| 33 | #include <debug.h> |
Varun Wadekar | 8b82fae | 2015-11-09 17:39:28 -0800 | [diff] [blame] | 34 | #include <delay_timer.h> |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 35 | #include <mmio.h> |
| 36 | #include <platform.h> |
| 37 | #include <platform_def.h> |
| 38 | #include <psci.h> |
| 39 | #include <pmc.h> |
| 40 | #include <flowctrl.h> |
| 41 | #include <tegra_def.h> |
| 42 | #include <tegra_private.h> |
| 43 | |
Varun Wadekar | 071b787 | 2015-07-08 17:42:02 +0530 | [diff] [blame] | 44 | /* |
| 45 | * Register used to clear CPU reset signals. Each CPU has two reset |
| 46 | * signals: CPU reset (3:0) and Core reset (19:16). |
| 47 | */ |
| 48 | #define CPU_CMPLX_RESET_CLR 0x454 |
| 49 | #define CPU_CORE_RESET_MASK 0x10001 |
| 50 | |
Varun Wadekar | 8b82fae | 2015-11-09 17:39:28 -0800 | [diff] [blame] | 51 | /* Clock and Reset controller registers for system clock's settings */ |
| 52 | #define SCLK_RATE 0x30 |
| 53 | #define SCLK_BURST_POLICY 0x28 |
| 54 | #define SCLK_BURST_POLICY_DEFAULT 0x10000000 |
| 55 | |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 56 | static int cpu_powergate_mask[PLATFORM_MAX_CPUS_PER_CLUSTER]; |
| 57 | |
Varun Wadekar | 254441d | 2015-07-23 10:07:54 +0530 | [diff] [blame] | 58 | int32_t tegra_soc_validate_power_state(unsigned int power_state) |
| 59 | { |
| 60 | /* Sanity check the requested afflvl */ |
| 61 | if (psci_get_pstate_type(power_state) == PSTATE_TYPE_STANDBY) { |
| 62 | /* |
| 63 | * It's possible to enter standby only on affinity level 0 i.e. |
| 64 | * a cpu on Tegra. Ignore any other affinity level. |
| 65 | */ |
| 66 | if (psci_get_pstate_afflvl(power_state) != MPIDR_AFFLVL0) |
| 67 | return PSCI_E_INVALID_PARAMS; |
| 68 | } |
| 69 | |
| 70 | /* Sanity check the requested state id */ |
| 71 | switch (psci_get_pstate_id(power_state)) { |
| 72 | case PSTATE_ID_CORE_POWERDN: |
| 73 | case PSTATE_ID_CLUSTER_IDLE: |
| 74 | case PSTATE_ID_CLUSTER_POWERDN: |
| 75 | case PSTATE_ID_SOC_POWERDN: |
| 76 | break; |
| 77 | |
| 78 | default: |
| 79 | ERROR("unsupported state id\n"); |
| 80 | return PSCI_E_NOT_SUPPORTED; |
| 81 | } |
| 82 | |
| 83 | return PSCI_E_SUCCESS; |
| 84 | } |
| 85 | |
| 86 | int tegra_soc_prepare_cpu_suspend(unsigned int id, unsigned int afflvl) |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 87 | { |
| 88 | /* There's nothing to be done for affinity level 1 */ |
| 89 | if (afflvl == MPIDR_AFFLVL1) |
| 90 | return PSCI_E_SUCCESS; |
| 91 | |
| 92 | switch (id) { |
| 93 | /* Prepare for cpu idle */ |
| 94 | case PSTATE_ID_CORE_POWERDN: |
| 95 | tegra_fc_cpu_idle(read_mpidr()); |
| 96 | return PSCI_E_SUCCESS; |
| 97 | |
| 98 | /* Prepare for cluster idle */ |
| 99 | case PSTATE_ID_CLUSTER_IDLE: |
| 100 | tegra_fc_cluster_idle(read_mpidr()); |
| 101 | return PSCI_E_SUCCESS; |
| 102 | |
| 103 | /* Prepare for cluster powerdn */ |
| 104 | case PSTATE_ID_CLUSTER_POWERDN: |
| 105 | tegra_fc_cluster_powerdn(read_mpidr()); |
| 106 | return PSCI_E_SUCCESS; |
| 107 | |
| 108 | /* Prepare for system idle */ |
| 109 | case PSTATE_ID_SOC_POWERDN: |
| 110 | |
| 111 | /* Enter system suspend state */ |
| 112 | tegra_pm_system_suspend_entry(); |
| 113 | |
| 114 | /* suspend the entire soc */ |
| 115 | tegra_fc_soc_powerdn(read_mpidr()); |
| 116 | |
| 117 | return PSCI_E_SUCCESS; |
| 118 | |
| 119 | default: |
| 120 | ERROR("Unknown state id (%d)\n", id); |
| 121 | break; |
| 122 | } |
| 123 | |
| 124 | return PSCI_E_NOT_SUPPORTED; |
| 125 | } |
| 126 | |
Varun Wadekar | 254441d | 2015-07-23 10:07:54 +0530 | [diff] [blame] | 127 | int tegra_soc_prepare_cpu_on_finish(unsigned long mpidr) |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 128 | { |
Varun Wadekar | bc78744 | 2015-07-27 13:00:50 +0530 | [diff] [blame] | 129 | uint32_t val; |
| 130 | |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 131 | /* |
| 132 | * Check if we are exiting from SOC_POWERDN. |
| 133 | */ |
| 134 | if (tegra_system_suspended()) { |
| 135 | |
| 136 | /* |
Varun Wadekar | bc78744 | 2015-07-27 13:00:50 +0530 | [diff] [blame] | 137 | * Enable WRAP to INCR burst type conversions for |
| 138 | * incoming requests on the AXI slave ports. |
| 139 | */ |
| 140 | val = mmio_read_32(TEGRA_MSELECT_BASE + MSELECT_CONFIG); |
| 141 | val &= ~ENABLE_UNSUP_TX_ERRORS; |
| 142 | val |= ENABLE_WRAP_TO_INCR_BURSTS; |
| 143 | mmio_write_32(TEGRA_MSELECT_BASE + MSELECT_CONFIG, val); |
| 144 | |
| 145 | /* |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 146 | * Restore Boot and Power Management Processor (BPMP) reset |
| 147 | * address and reset it. |
| 148 | */ |
| 149 | tegra_fc_reset_bpmp(); |
| 150 | |
| 151 | /* |
| 152 | * System resume complete. |
| 153 | */ |
| 154 | tegra_pm_system_suspend_exit(); |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * T210 has a dedicated ARMv7 boot and power mgmt processor, BPMP. It's |
| 159 | * used for power management and boot purposes. Inform the BPMP that |
| 160 | * we have completed the cluster power up. |
| 161 | */ |
| 162 | if (psci_get_max_phys_off_afflvl() == MPIDR_AFFLVL1) |
| 163 | tegra_fc_lock_active_cluster(); |
| 164 | |
| 165 | return PSCI_E_SUCCESS; |
| 166 | } |
| 167 | |
Varun Wadekar | 254441d | 2015-07-23 10:07:54 +0530 | [diff] [blame] | 168 | int tegra_soc_prepare_cpu_on(unsigned long mpidr) |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 169 | { |
| 170 | int cpu = mpidr & MPIDR_CPU_MASK; |
Varun Wadekar | 071b787 | 2015-07-08 17:42:02 +0530 | [diff] [blame] | 171 | uint32_t mask = CPU_CORE_RESET_MASK << cpu; |
| 172 | |
| 173 | /* Deassert CPU reset signals */ |
| 174 | mmio_write_32(TEGRA_CAR_RESET_BASE + CPU_CMPLX_RESET_CLR, mask); |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 175 | |
| 176 | /* Turn on CPU using flow controller or PMC */ |
| 177 | if (cpu_powergate_mask[cpu] == 0) { |
| 178 | tegra_pmc_cpu_on(cpu); |
| 179 | cpu_powergate_mask[cpu] = 1; |
| 180 | } else { |
| 181 | tegra_fc_cpu_on(cpu); |
| 182 | } |
| 183 | |
| 184 | return PSCI_E_SUCCESS; |
| 185 | } |
| 186 | |
Varun Wadekar | 254441d | 2015-07-23 10:07:54 +0530 | [diff] [blame] | 187 | int tegra_soc_prepare_cpu_off(unsigned long mpidr) |
Varun Wadekar | b316e24 | 2015-05-19 16:48:04 +0530 | [diff] [blame] | 188 | { |
| 189 | tegra_fc_cpu_off(mpidr & MPIDR_CPU_MASK); |
| 190 | return PSCI_E_SUCCESS; |
| 191 | } |
Varun Wadekar | 8b82fae | 2015-11-09 17:39:28 -0800 | [diff] [blame] | 192 | |
| 193 | int tegra_soc_prepare_system_reset(void) |
| 194 | { |
| 195 | /* |
| 196 | * Set System Clock (SCLK) to POR default so that the clock source |
| 197 | * for the PMC APB clock would not be changed due to system reset. |
| 198 | */ |
| 199 | mmio_write_32((uintptr_t)TEGRA_CAR_RESET_BASE + SCLK_BURST_POLICY, |
| 200 | SCLK_BURST_POLICY_DEFAULT); |
| 201 | mmio_write_32((uintptr_t)TEGRA_CAR_RESET_BASE + SCLK_RATE, 0); |
| 202 | |
| 203 | /* Wait 1 ms to make sure clock source/device logic is stabilized. */ |
| 204 | mdelay(1); |
| 205 | |
| 206 | return PSCI_E_SUCCESS; |
| 207 | } |