| /* |
| * Copyright (c) 2017 Jean-Paul Etienne <fractalclone@gmail.com> |
| * Copyright (c) 2017 Palmer Dabbelt <palmer@dabbelt.com> |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <init.h> |
| #include "prci.h" |
| |
| /* Selects the 16MHz oscilator on the HiFive1 board, which provides a clock |
| * that's accurate enough to actually drive serial ports off of. |
| */ |
| static int hifive1_clock_init(struct device *dev) |
| { |
| ARG_UNUSED(dev); |
| |
| PRCI_REG(PRCI_PLLCFG) = PLL_REFSEL(1) | PLL_BYPASS(1); |
| PRCI_REG(PRCI_PLLDIV) = (PLL_FINAL_DIV_BY_1(1) | PLL_FINAL_DIV(0)); |
| PRCI_REG(PRCI_PLLCFG) |= PLL_SEL(1); |
| PRCI_REG(PRCI_HFROSCCFG) &= ~ROSC_EN(1); |
| return 0; |
| } |
| |
| SYS_INIT(hifive1_clock_init, PRE_KERNEL_1, CONFIG_PINMUX_INIT_PRIORITY); |
