| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2014 Travis Geiselbrecht |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining |
| 5 | * a copy of this software and associated documentation files |
| 6 | * (the "Software"), to deal in the Software without restriction, |
| 7 | * including without limitation the rights to use, copy, modify, merge, |
| 8 | * publish, distribute, sublicense, and/or sell copies of the Software, |
| 9 | * and to permit persons to whom the Software is furnished to do so, |
| 10 | * subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be |
| 13 | * included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 16 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 17 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| 19 | * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| 20 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| 21 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 22 | */ |
| 23 | |
| 24 | #include <err.h> |
| 25 | #include <stdio.h> |
| 26 | #include <debug.h> |
| 27 | #include <platform.h> |
| 28 | #include <platform/lpc.h> |
| 29 | #include <arch/arm/cm.h> |
| 30 | |
| 31 | void lpc_debug_early_init(void); |
| 32 | void lpc_debug_init(void); |
| 33 | |
| 34 | void lpc_gpio_early_init(void); |
| 35 | void lpc_gpio_init(void); |
| 36 | |
| 37 | void lpc_usbc_early_init(void); |
| 38 | void lpc_usbc_init(void); |
| 39 | |
| 40 | void platform_early_init(void) |
| 41 | { |
| 42 | /* set up clocking for a board with an external oscillator */ |
| 43 | Chip_SetupXtalClocking(); |
| 44 | |
| 45 | /* Set USB PLL input to main oscillator */ |
| 46 | Chip_Clock_SetUSBPLLSource(SYSCTL_PLLCLKSRC_MAINOSC); |
| 47 | /* Setup USB PLL (FCLKIN = 12MHz) * 4 = 48MHz |
| 48 | MSEL = 3 (this is pre-decremented), PSEL = 1 (for P = 2) |
| 49 | FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 4 = 48MHz |
| 50 | FCCO = FCLKOUT * 2 * P = 48MHz * 2 * 2 = 192MHz (within FCCO range) */ |
| 51 | Chip_Clock_SetupUSBPLL(3, 1); |
| 52 | |
| 53 | /* Powerup USB PLL */ |
| 54 | Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPLL_PD); |
| 55 | |
| 56 | /* Wait for PLL to lock */ |
| 57 | while (!Chip_Clock_IsUSBPLLLocked()) {} |
| 58 | |
| 59 | /* Set default system tick divder to 1 */ |
| 60 | Chip_Clock_SetSysTickClockDiv(1); |
| 61 | |
| 62 | /* start the generic systick driver */ |
| 63 | arm_cm_systick_init(Chip_Clock_GetMainClockRate()); |
| 64 | |
| 65 | lpc_debug_early_init(); |
| 66 | } |
| 67 | |
| 68 | void platform_init(void) |
| 69 | { |
| 70 | lpc_debug_init(); |
| 71 | } |
| 72 | |
| 73 | // vim: set ts=4 sw=4 expandtab: |