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/*
* Copyright (c) 2010-2014, 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 <common.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/flow.h>
#include <asm/arch/tegra.h>
#include <asm/arch-tegra/clk_rst.h>
#include <asm/arch-tegra/pmc.h>
#include <asm/arch-tegra/tegra_i2c.h>
#include "../tegra-common/cpu.h"
/* Tegra30-specific CPU init code */
void tegra_i2c_ll_write_addr(uint addr, uint config)
{
struct i2c_ctlr *reg = (struct i2c_ctlr *)TEGRA_DVC_BASE;
writel(addr, ®->cmd_addr0);
writel(config, ®->cnfg);
}
void tegra_i2c_ll_write_data(uint data, uint config)
{
struct i2c_ctlr *reg = (struct i2c_ctlr *)TEGRA_DVC_BASE;
writel(data, ®->cmd_data1);
writel(config, ®->cnfg);
}
#define TPS65911_I2C_ADDR 0x5A
#define TPS65911_VDDCTRL_OP_REG 0x28
#define TPS65911_VDDCTRL_SR_REG 0x27
#define TPS65911_VDDCTRL_OP_DATA (0x2300 | TPS65911_VDDCTRL_OP_REG)
#define TPS65911_VDDCTRL_SR_DATA (0x0100 | TPS65911_VDDCTRL_SR_REG)
#define I2C_SEND_2_BYTES 0x0A02
static void enable_cpu_power_rail(void)
{
struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
u32 reg;
debug("enable_cpu_power_rail entry\n");
reg = readl(&pmc->pmc_cntrl);
reg |= CPUPWRREQ_OE;
writel(reg, &pmc->pmc_cntrl);
/*
* Bring up CPU VDD via the TPS65911x PMIC on the DVC I2C bus.
* First set VDD to 1.4V, then enable the VDD regulator.
*/
tegra_i2c_ll_write_addr(TPS65911_I2C_ADDR, 2);
tegra_i2c_ll_write_data(TPS65911_VDDCTRL_OP_DATA, I2C_SEND_2_BYTES);
udelay(1000);
tegra_i2c_ll_write_data(TPS65911_VDDCTRL_SR_DATA, I2C_SEND_2_BYTES);
udelay(10 * 1000);
}
/**
* The T30 requires some special clock initialization, including setting up
* the dvc i2c, turning on mselect and selecting the G CPU cluster
*/
void t30_init_clocks(void)
{
struct clk_rst_ctlr *clkrst =
(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE;
u32 val;
debug("t30_init_clocks entry\n");
/* Set active CPU cluster to G */
clrbits_le32(flow->cluster_control, 1 << 0);
writel(SUPER_SCLK_ENB_MASK, &clkrst->crc_super_sclk_div);
val = (0 << CLK_SYS_RATE_HCLK_DISABLE_SHIFT) |
(1 << CLK_SYS_RATE_AHB_RATE_SHIFT) |
(0 << CLK_SYS_RATE_PCLK_DISABLE_SHIFT) |
(0 << CLK_SYS_RATE_APB_RATE_SHIFT);
writel(val, &clkrst->crc_clk_sys_rate);
/* Put i2c, mselect in reset and enable clocks */
reset_set_enable(PERIPH_ID_DVC_I2C, 1);
clock_set_enable(PERIPH_ID_DVC_I2C, 1);
reset_set_enable(PERIPH_ID_MSELECT, 1);
clock_set_enable(PERIPH_ID_MSELECT, 1);
/* Switch MSELECT clock to PLLP (00) and use a divisor of 2 */
clock_ll_set_source_divisor(PERIPH_ID_MSELECT, 0, 2);
/*
* Our high-level clock routines are not available prior to
* relocation. We use the low-level functions which require a
* hard-coded divisor. Use CLK_M with divide by (n + 1 = 17)
*/
clock_ll_set_source_divisor(PERIPH_ID_DVC_I2C, 3, 16);
/*
* Give clocks time to stabilize, then take i2c and mselect out of
* reset
*/
udelay(1000);
reset_set_enable(PERIPH_ID_DVC_I2C, 0);
reset_set_enable(PERIPH_ID_MSELECT, 0);
}
static void set_cpu_running(int run)
{
struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE;
debug("set_cpu_running entry, run = %d\n", run);
writel(run ? FLOW_MODE_NONE : FLOW_MODE_STOP, &flow->halt_cpu_events);
}
void start_cpu(u32 reset_vector)
{
debug("start_cpu entry, reset_vector = %x\n", reset_vector);
t30_init_clocks();
/* Enable VDD_CPU */
enable_cpu_power_rail();
set_cpu_running(0);
/* Hold the CPUs in reset */
reset_A9_cpu(1);
/* Disable the CPU clock */
enable_cpu_clock(0);
/* Enable CoreSight */
clock_enable_coresight(1);
/*
* Set the entry point for CPU execution from reset,
* if it's a non-zero value.
*/
if (reset_vector)
writel(reset_vector, EXCEP_VECTOR_CPU_RESET_VECTOR);
/* Enable the CPU clock */
enable_cpu_clock(1);
/* If the CPU doesn't already have power, power it up */
powerup_cpu();
/* Take the CPU out of reset */
reset_A9_cpu(0);
set_cpu_running(1);
}
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