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/*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <delay.h>
#include <arch/io.h>
#include <soc.h>
#include <clk_rst.h>
#include <clock.h>
static struct clk_rst_ctlr *clk_rst = (void *)NV_PA_CLK_RST_BASE;
/*
* On poweron, AVP clock source (also called system clock) is set to PLLP_out0
* with frequency set at 1MHz. Before initializing PLLP, we need to move the
* system clock's source to CLK_M temporarily. And then switch it to PLLP_out4
* (204MHz) at a later time.
*/
void set_avp_clock_to_clkm(void)
{
u32 val;
val = (SCLK_SOURCE_CLKM << SCLK_SWAKEUP_FIQ_SOURCE_SHIFT) |
(SCLK_SOURCE_CLKM << SCLK_SWAKEUP_IRQ_SOURCE_SHIFT) |
(SCLK_SOURCE_CLKM << SCLK_SWAKEUP_RUN_SOURCE_SHIFT) |
(SCLK_SOURCE_CLKM << SCLK_SWAKEUP_IDLE_SOURCE_SHIFT) |
(SCLK_SYS_STATE_RUN << SCLK_SYS_STATE_SHIFT);
writel(val, &clk_rst->crc_sclk_brst_pol);
/* Wait 2-3us for the clock to flush thru the logic as per the TRM */
udelay(3);
}
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