diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/nvidia/tegra132/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/soc/nvidia/tegra132/soc.c | 64 | ||||
| -rw-r--r-- | src/soc/nvidia/tegra132/spintable.S | 38 |
3 files changed, 102 insertions, 1 deletions
diff --git a/src/soc/nvidia/tegra132/Makefile.inc b/src/soc/nvidia/tegra132/Makefile.inc index 447963970c..261e570f73 100644 --- a/src/soc/nvidia/tegra132/Makefile.inc +++ b/src/soc/nvidia/tegra132/Makefile.inc @@ -69,6 +69,7 @@ ramstage-y += ../tegra/gpio.c ramstage-y += ../tegra/i2c.c ramstage-y += ../tegra/pinmux.c ramstage-y += ramstage.c +ramstage-y += spintable.S ramstage-y += mmu_operations.c ramstage-$(CONFIG_DRIVERS_UART) += uart.c ramstage-y += ../tegra/usb.c diff --git a/src/soc/nvidia/tegra132/soc.c b/src/soc/nvidia/tegra132/soc.c index 024fd805da..16001f9fb3 100644 --- a/src/soc/nvidia/tegra132/soc.c +++ b/src/soc/nvidia/tegra132/soc.c @@ -18,10 +18,13 @@ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ +#include <string.h> #include <console/console.h> #include <device/device.h> #include <arch/io.h> #include <arch/cpu.h> +#include <arch/cache.h> +#include <cbmem.h> #include <timer.h> #include <vendorcode/google/chromeos/chromeos.h> #include <soc/addressmap.h> @@ -62,12 +65,69 @@ static void soc_read_resources(device_t dev) static volatile int secondary_cpu_up; +static void *spintable_entry; +static uint64_t * const spintable_magic = (void *)(uintptr_t)0x80000008; + +static void spintable_init(void) +{ + extern void __wait_for_spin_table_request(void); + const size_t spintable_entry_size = 4096; + + spintable_entry = + cbmem_add(0x11111111, spintable_entry_size); + + memcpy(spintable_entry, __wait_for_spin_table_request, + spintable_entry_size); + + /* Ensure the memory location is zero'd out. */ + *spintable_magic = 0; + + dcache_clean_invalidate_by_mva(spintable_magic, + sizeof(*spintable_magic)); + dcache_clean_invalidate_by_mva(&spintable_entry, + sizeof(spintable_entry)); + dcache_clean_invalidate_by_mva(spintable_entry, spintable_entry_size); + dsb(); +} + +static void spintable_wait(void) +{ + uint32_t sctlr_el2; + uint32_t spsr_el3; + uint32_t scr_el3; + + sctlr_el2 = raw_read_sctlr_el2(); + /* Make sure EL2 is in little endian without any caching enabled. */ + sctlr_el2 &= ~(1 << 25); + sctlr_el2 &= ~(1 << 19); + sctlr_el2 &= ~(1 << 12); + sctlr_el2 &= ~0xf; + raw_write_sctlr_el2(sctlr_el2); + /* Ensure enter into EL2t with interrupts disabled. */ + spsr_el3 = (1 << 9) | (0xf << 6) | (1 << 3); + raw_write_spsr_el3(spsr_el3); + raw_write_elr_el3((uintptr_t)spintable_entry); + /* + * Lower exception level is 64 bit. HVC and SMC allowed. EL0 and EL1 + * in non-secure mode. No interrupts routed to EL3. + */ + scr_el3 = raw_read_scr_el3(); + scr_el3 |= (1 << 10) | (1 << 8) | (0x3 << 4) | (1 << 0); + scr_el3 &= ~((0x7 << 1) | (1 << 7) | (1 << 9) | (1 << 13) | (1 << 12)); + raw_write_scr_el3(scr_el3); + isb(); + asm volatile( + "mov x0, %0\n\t" + "eret\n\t" : : "r" (spintable_magic) : "x0" ); +} + void soc_secondary_cpu_init(void) { printk(BIOS_INFO, "CPU%d is up!\n", smp_processor_id()); gic_init(); dmb(); secondary_cpu_up = 1; + spintable_wait(); } static void start_secondary_cpu(void) @@ -104,8 +164,10 @@ static void soc_init(device_t dev) clock_init_arm_generic_timer(); gic_init(); - if (config->bring_up_secondary_cpu) + if (config->bring_up_secondary_cpu) { + spintable_init(); start_secondary_cpu(); + } } static void soc_noop(device_t dev) diff --git a/src/soc/nvidia/tegra132/spintable.S b/src/soc/nvidia/tegra132/spintable.S new file mode 100644 index 0000000000..3066b7e679 --- /dev/null +++ b/src/soc/nvidia/tegra132/spintable.S @@ -0,0 +1,38 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2014 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that 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, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <arch/asm.h> + +ENTRY(__wait_for_spin_table_request) + /* Entry here is in EL2 with the magic address in x0. */ + mov x28, x0 +1: + ldr x27, [x28] + cmp x27, xzr + b.ne 2f + wfe + b 1b +2: + /* Entry into the kernel. */ + mov x0, xzr + mov x1, xzr + mov x2, xzr + mov x3, xzr + br x27 +ENDPROC(__wait_for_spin_table_request) |