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/*
* plio.c
* PLIO state machine support functions
*
* Copyright © 2009 Ubicom Inc. <www.ubicom.com>. All rights reserved.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port 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, either
* version 2 of the License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*/
#include <linux/types.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <asm/plio.h>
/*
* plio_reset
* Select and reset PLIO function
*/
static void plio_reset(const plio_fctl_t *plio_fctl) {
plio_io_function_t plio_function = {
.fn_sel = PLIO_FN,
.fn_reset = 1,
};
/*
* enable extension port
*/
PEXT_NBR->function = plio_function;
/*
* program clock dividers
*/
PLIO_NBR->fctl2 = plio_fctl->fctl2;
/*
* select plio function and assert function reset
*/
plio_function.br_thread = thread_get_self();
plio_function.fn_reset = 1;
PLIO_NBR->function = plio_function;
/*
* program plio controls
*/
PLIO_NBR->fctl0 = plio_fctl->fctl0;
PLIO_NBR->fctl1 = plio_fctl->fctl1;
/*
* deassert function reset
*/
plio_function.fn_reset = 0;
PLIO_NBR->function = plio_function;
}
/*
* plio_init
* configure and initialize PLIO.
*/
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){
/*
* first reset to start plio clock
*/
plio_reset(plio_fctl);
udelay(1);
/*
* configure pfsm
*/
PLIO_NBR->fctl0.pfsm_prog = 1;
memcpy(PLIO_BR->pfsm_sram, plio_sram_cfg, sram_cfg_size);
PLIO_NBR->fctl0.pfsm_prog = 0;
/*
* program rest of plio
*/
memcpy(&PLIO_BR->config, plio_config, sizeof(plio_config_t));
}
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