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/*
* Copyright (c) 2012 - 2013 The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <device/mmio.h>
#include <delay.h>
#include <soc/blsp.h>
#include <soc/clock.h>
#include <types.h>
#include <console/console.h>
#define CLOCK_UPDATE_DELAY 1000
/**
* uart_clock_config - configures UART clocks
*
* Configures GSBI UART dividers, enable root and branch clocks.
*/
void uart_clock_config(unsigned int blsp_uart, unsigned int m,
unsigned int n, unsigned int d)
{
int i;
/* Setup M, N & D */
write32(GCC_BLSP1_UART_APPS_M(blsp_uart), m);
write32(GCC_BLSP1_UART_APPS_N(blsp_uart), ~(n - m));
write32(GCC_BLSP1_UART_APPS_D(blsp_uart), ~d);
write32(GCC_BLSP1_UART_MISC(blsp_uart), 0);
/* Setup source sel etc. */
write32(GCC_BLSP1_UART_APPS_CFG_RCGR(blsp_uart),
0 | /* 0: 4 SRC_DIV = Bypass */
0 << 8 | /* 8:10 SRC_SEL = CxO */
2 << 12); /* 13:12 Mode = Dual Edge */
/* Trigger update */
setbits32(GCC_BLSP1_UART_APPS_CMD_RCGR(blsp_uart), 1);
/* Wait for update */
for (i = 0; i < CLOCK_UPDATE_DELAY; i++) {
if (!(read32(GCC_BLSP1_UART_APPS_CMD_RCGR(blsp_uart)) & 1)) {
/* Updated */
break;
}
udelay(1);
}
/* Please refer to the comments in blsp_i2c_clock_config() */
setbits32(GCC_CLK_BRANCH_ENA, BLSP1_AHB | BLSP1_SLEEP);
}
/**
* nand_clock_config - configure NAND controller clocks
*
* Enable clocks to EBI2. Must be invoked before touching EBI2
* registers.
*/
void nand_clock_config(void)
{
write32(EBI2_CLK_CTL_REG,
CLK_BRANCH_ENA(1) | ALWAYS_ON_CLK_BRANCH_ENA(1));
/* Wait for clock to stabilize. */
udelay(10);
}
/**
* usb_clock_config - configure USB controller clocks and reset the controller
*/
void usb_clock_config(void)
{
/* Magic clock initialization numbers, nobody knows how they work... */
write32(USB30_MASTER_CLK_CTL_REG, 0x10);
write32(USB30_1_MASTER_CLK_CTL_REG, 0x10);
write32(USB30_MASTER_CLK_MD, 0x500DF);
write32(USB30_MASTER_CLK_NS, 0xE40942);
write32(USB30_MOC_UTMI_CLK_MD, 0x100D7);
write32(USB30_MOC_UTMI_CLK_NS, 0xD80942);
write32(USB30_MOC_UTMI_CLK_CTL, 0x10);
write32(USB30_1_MOC_UTMI_CLK_CTL, 0x10);
write32(USB30_RESET,
1 << 5 | /* assert port2 HS PHY async reset */
1 << 4 | /* assert master async reset */
1 << 3 | /* assert sleep async reset */
1 << 2 | /* assert MOC UTMI async reset */
1 << 1 | /* assert power-on async reset */
1 << 0); /* assert PHY async reset */
udelay(5);
write32(USB30_RESET, 0); /* deassert all USB resets again */
}
int blsp_i2c_clock_config(blsp_qup_id_t id)
{
int i;
const int max_tries = 200;
struct { void *cbcr, *cmd, *cfg; } clk[] = {
{
GCC_BLSP1_QUP1_I2C_APPS_CBCR,
GCC_BLSP1_QUP1_I2C_APPS_CMD_RCGR,
GCC_BLSP1_QUP1_I2C_APPS_CFG_RCGR,
},
{
GCC_BLSP1_QUP1_I2C_APPS_CBCR,
GCC_BLSP1_QUP1_I2C_APPS_CMD_RCGR,
GCC_BLSP1_QUP1_I2C_APPS_CFG_RCGR,
},
{
GCC_BLSP1_QUP1_I2C_APPS_CBCR,
GCC_BLSP1_QUP1_I2C_APPS_CMD_RCGR,
GCC_BLSP1_QUP1_I2C_APPS_CFG_RCGR,
},
{
GCC_BLSP1_QUP1_I2C_APPS_CBCR,
GCC_BLSP1_QUP1_I2C_APPS_CMD_RCGR,
GCC_BLSP1_QUP1_I2C_APPS_CFG_RCGR,
},
};
/*
* uart_clock_config() does this. Ideally, setting these bits once
* should suffice. However, if for some reason the order of invocation
* of uart_clock_config and blsp_i2c_clock_config gets changed or
* something, then one of the functions might not work. Hence, to steer
* clear of such dependencies, just replicating the setting of this
* bits.
*
* Moreover, they are read-modify-write and HW wise repeated setting of
* the same bits is harmless. Hence repeating them here should be ok.
* This will ensure root and branch clocks remain on.
*/
setbits32(GCC_CLK_BRANCH_ENA, BLSP1_AHB | BLSP1_SLEEP);
/* Src Sel 1 (fepll 200), Src Div 10.5 */
write32(clk[id].cfg, (1u << 8) | (20u << 0));
write32(clk[id].cmd, BIT(0)); /* Update En */
for (i = 0; i < max_tries; i++) {
if (read32(clk[id].cmd) & BIT(0)) {
udelay(5);
continue;
}
break;
}
if (i == max_tries) {
printk(BIOS_ERR, "%s failed\n", __func__);
return -ETIMEDOUT;
}
write32(clk[id].cbcr, BIT(0)); /* Enable */
return 0;
}
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