| 1 | /* |
| 2 | * plio.c |
| 3 | * PLIO state machine support functions |
| 4 | * |
| 5 | * Copyright © 2009 Ubicom Inc. <www.ubicom.com>. All rights reserved. |
| 6 | * |
| 7 | * This file is part of the Ubicom32 Linux Kernel Port. |
| 8 | * |
| 9 | * The Ubicom32 Linux Kernel Port is free software: you can |
| 10 | * redistribute it and/or modify it under the terms of the GNU General |
| 11 | * Public License as published by the Free Software Foundation, either |
| 12 | * version 2 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * The Ubicom32 Linux Kernel Port is distributed in the hope that it |
| 15 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 16 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 17 | * See the GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with the Ubicom32 Linux Kernel Port. If not, |
| 21 | * see <http://www.gnu.org/licenses/>. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/string.h> |
| 26 | #include <linux/delay.h> |
| 27 | #include <asm/plio.h> |
| 28 | |
| 29 | /* |
| 30 | * plio_reset |
| 31 | * Select and reset PLIO function |
| 32 | */ |
| 33 | static void plio_reset(const plio_fctl_t *plio_fctl) { |
| 34 | plio_io_function_t plio_function = { |
| 35 | .fn_sel = PLIO_FN, |
| 36 | .fn_reset = 1, |
| 37 | }; |
| 38 | |
| 39 | /* |
| 40 | * enable extension port |
| 41 | */ |
| 42 | PEXT_NBR->function = plio_function; |
| 43 | |
| 44 | /* |
| 45 | * program clock dividers |
| 46 | */ |
| 47 | PLIO_NBR->fctl2 = plio_fctl->fctl2; |
| 48 | |
| 49 | /* |
| 50 | * select plio function and assert function reset |
| 51 | */ |
| 52 | plio_function.br_thread = thread_get_self(); |
| 53 | plio_function.fn_reset = 1; |
| 54 | PLIO_NBR->function = plio_function; |
| 55 | |
| 56 | /* |
| 57 | * program plio controls |
| 58 | */ |
| 59 | PLIO_NBR->fctl0 = plio_fctl->fctl0; |
| 60 | PLIO_NBR->fctl1 = plio_fctl->fctl1; |
| 61 | |
| 62 | /* |
| 63 | * deassert function reset |
| 64 | */ |
| 65 | plio_function.fn_reset = 0; |
| 66 | PLIO_NBR->function = plio_function; |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * plio_init |
| 71 | * configure and initialize PLIO. |
| 72 | */ |
| 73 | void plio_init(const plio_fctl_t *plio_fctl, const plio_config_t *plio_config, const plio_sram_t plio_sram_cfg[], int sram_cfg_size){ |
| 74 | /* |
| 75 | * first reset to start plio clock |
| 76 | */ |
| 77 | plio_reset(plio_fctl); |
| 78 | |
| 79 | udelay(1); |
| 80 | |
| 81 | /* |
| 82 | * configure pfsm |
| 83 | */ |
| 84 | PLIO_NBR->fctl0.pfsm_prog = 1; |
| 85 | memcpy(PLIO_BR->pfsm_sram, plio_sram_cfg, sram_cfg_size); |
| 86 | PLIO_NBR->fctl0.pfsm_prog = 0; |
| 87 | |
| 88 | /* |
| 89 | * program rest of plio |
| 90 | */ |
| 91 | memcpy(&PLIO_BR->config, plio_config, sizeof(plio_config_t)); |
| 92 | } |
| 93 | |
