diff options
Diffstat (limited to 'plat/marvell/armada/a3k/common/aarch64/a3700_clock.S')
| -rw-r--r-- | plat/marvell/armada/a3k/common/aarch64/a3700_clock.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/plat/marvell/armada/a3k/common/aarch64/a3700_clock.S b/plat/marvell/armada/a3k/common/aarch64/a3700_clock.S new file mode 100644 index 0000000..f79516f --- /dev/null +++ b/plat/marvell/armada/a3k/common/aarch64/a3700_clock.S @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2018 Marvell International Ltd. + * + * SPDX-License-Identifier: BSD-3-Clause + * https://spdx.org/licenses + */ + +#include <asm_macros.S> +#include <platform_def.h> + +/* + * Below address in used only for reading, therefore no problem with concurrent + * Linux access. + */ +#define MVEBU_TEST_PIN_LATCH_N (MVEBU_NB_GPIO_REG_BASE + 0x8) + #define MVEBU_XTAL_MODE_MASK BIT(9) + + /* ----------------------------------------------------- + * uint32_t get_ref_clk (void); + * + * returns reference clock in MHz (25 or 40) + * ----------------------------------------------------- + */ +.globl get_ref_clk +func get_ref_clk + mov_imm x0, MVEBU_TEST_PIN_LATCH_N + ldr w0, [x0] + tst w0, #MVEBU_XTAL_MODE_MASK + bne 40 + mov w0, #25 + ret +40: + mov w0, #40 + ret +endfunc get_ref_clk |