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u-boot/arch/arm/mach-tegra/tegra114/cpu.c
Tom Warren 722e000ccd Tegra: PLL: use per-SoC pllinfo table instead of PLL_DIVM/N/P, etc. 
Added PLL variables (dividers mask/shift, lock enable/detect, etc.)
to new pllinfo struct for each Soc/PLL. PLLA/C/D/E/M/P/U/X.

Used pllinfo struct in all clock functions, validated on T210.
Should be equivalent to prior code on T124/114/30/20. Thanks
to Marcel Ziswiler for corrections to the T20/T30 values.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
2015-08-05 15:22:51 -07:00

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/*
* (C) Copyright 2010-2014
* NVIDIA Corporation <www.nvidia.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/flow.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/tegra.h>
#include <asm/arch-tegra/clk_rst.h>
#include <asm/arch-tegra/pmc.h>
#include "../cpu.h"
/* Tegra114-specific CPU init code */
static void enable_cpu_power_rail(void)
{
struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
u32 reg;
debug("%s entry\n", __func__);
/* un-tristate PWR_I2C SCL/SDA, rest of the defaults are correct */
pinmux_tristate_disable(PMUX_PINGRP_PWR_I2C_SCL_PZ6);
pinmux_tristate_disable(PMUX_PINGRP_PWR_I2C_SDA_PZ7);
/*
* Set CPUPWRGOOD_TIMER - APB clock is 1/2 of SCLK (102MHz),
* set it for 25ms (102MHz * .025)
*/
reg = 0x26E8F0;
writel(reg, &pmc->pmc_cpupwrgood_timer);
/* Set polarity to 0 (normal) and enable CPUPWRREQ_OE */
clrbits_le32(&pmc->pmc_cntrl, CPUPWRREQ_POL);
setbits_le32(&pmc->pmc_cntrl, CPUPWRREQ_OE);
/*
* Set CLK_RST_CONTROLLER_CPU_SOFTRST_CTRL2_0_CAR2PMC_CPU_ACK_WIDTH
* to 408 to satisfy the requirement of having at least 16 CPU clock
* cycles before clamp removal.
*/
clrbits_le32(&clkrst->crc_cpu_softrst_ctrl2, 0xFFF);
setbits_le32(&clkrst->crc_cpu_softrst_ctrl2, 408);
}
static void enable_cpu_clocks(void)
{
struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
struct clk_pll_info *pllinfo = &tegra_pll_info_table[CLOCK_ID_XCPU];
u32 reg;
debug("%s entry\n", __func__);
/* Wait for PLL-X to lock */
do {
reg = readl(&clkrst->crc_pll_simple[SIMPLE_PLLX].pll_base);
} while ((reg & (1 << pllinfo->lock_det)) == 0);
/* Wait until all clocks are stable */
udelay(PLL_STABILIZATION_DELAY);
writel(CCLK_BURST_POLICY, &clkrst->crc_cclk_brst_pol);
writel(SUPER_CCLK_DIVIDER, &clkrst->crc_super_cclk_div);
/* Always enable the main CPU complex clocks */
clock_enable(PERIPH_ID_CPU);
clock_enable(PERIPH_ID_CPULP);
clock_enable(PERIPH_ID_CPUG);
}
static void remove_cpu_resets(void)
{
struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
u32 reg;
debug("%s entry\n", __func__);
/* Take the slow non-CPU partition out of reset */
reg = readl(&clkrst->crc_rst_cpulp_cmplx_clr);
writel((reg | CLR_NONCPURESET), &clkrst->crc_rst_cpulp_cmplx_clr);
/* Take the fast non-CPU partition out of reset */
reg = readl(&clkrst->crc_rst_cpug_cmplx_clr);
writel((reg | CLR_NONCPURESET), &clkrst->crc_rst_cpug_cmplx_clr);
/* Clear the SW-controlled reset of the slow cluster */
reg = readl(&clkrst->crc_rst_cpulp_cmplx_clr);
reg |= (CLR_CPURESET0+CLR_DBGRESET0+CLR_CORERESET0+CLR_CXRESET0);
writel(reg, &clkrst->crc_rst_cpulp_cmplx_clr);
/* Clear the SW-controlled reset of the fast cluster */
reg = readl(&clkrst->crc_rst_cpug_cmplx_clr);
reg |= (CLR_CPURESET0+CLR_DBGRESET0+CLR_CORERESET0+CLR_CXRESET0);
reg |= (CLR_CPURESET1+CLR_DBGRESET1+CLR_CORERESET1+CLR_CXRESET1);
reg |= (CLR_CPURESET2+CLR_DBGRESET2+CLR_CORERESET2+CLR_CXRESET2);
reg |= (CLR_CPURESET3+CLR_DBGRESET3+CLR_CORERESET3+CLR_CXRESET3);
writel(reg, &clkrst->crc_rst_cpug_cmplx_clr);
}
/**
* Tegra114 requires some special clock initialization, including setting up
* the DVC I2C, turning on MSELECT and selecting the G CPU cluster
*/
void t114_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("%s entry\n", __func__);
/* Set active CPU cluster to G */
clrbits_le32(&flow->cluster_control, 1);
writel(SUPER_SCLK_ENB_MASK, &clkrst->crc_super_sclk_div);
debug("Setting up PLLX\n");
init_pllx();
val = (1 << CLK_SYS_RATE_AHB_RATE_SHIFT);
writel(val, &clkrst->crc_clk_sys_rate);
/* Enable clocks to required peripherals. TBD - minimize this list */
debug("Enabling clocks\n");
clock_set_enable(PERIPH_ID_CACHE2, 1);
clock_set_enable(PERIPH_ID_GPIO, 1);
clock_set_enable(PERIPH_ID_TMR, 1);
clock_set_enable(PERIPH_ID_RTC, 1);
clock_set_enable(PERIPH_ID_CPU, 1);
clock_set_enable(PERIPH_ID_EMC, 1);
clock_set_enable(PERIPH_ID_I2C5, 1);
clock_set_enable(PERIPH_ID_FUSE, 1);
clock_set_enable(PERIPH_ID_PMC, 1);
clock_set_enable(PERIPH_ID_APBDMA, 1);
clock_set_enable(PERIPH_ID_MEM, 1);
clock_set_enable(PERIPH_ID_IRAMA, 1);
clock_set_enable(PERIPH_ID_IRAMB, 1);
clock_set_enable(PERIPH_ID_IRAMC, 1);
clock_set_enable(PERIPH_ID_IRAMD, 1);
clock_set_enable(PERIPH_ID_CORESIGHT, 1);
clock_set_enable(PERIPH_ID_MSELECT, 1);
clock_set_enable(PERIPH_ID_EMC1, 1);
clock_set_enable(PERIPH_ID_MC1, 1);
clock_set_enable(PERIPH_ID_DVFS, 1);
/*
* Set MSELECT clock source as PLLP (00), and ask for a clock
* divider that would set the MSELECT clock at 102MHz for a
* PLLP base of 408MHz.
*/
clock_ll_set_source_divisor(PERIPH_ID_MSELECT, 0,
CLK_DIVIDER(NVBL_PLLP_KHZ, 102000));
/* I2C5 (DVC) gets CLK_M and a divisor of 17 */
clock_ll_set_source_divisor(PERIPH_ID_I2C5, 3, 16);
/* Give clocks time to stabilize */
udelay(1000);
/* Take required peripherals out of reset */
debug("Taking periphs out of reset\n");
reset_set_enable(PERIPH_ID_CACHE2, 0);
reset_set_enable(PERIPH_ID_GPIO, 0);
reset_set_enable(PERIPH_ID_TMR, 0);
reset_set_enable(PERIPH_ID_COP, 0);
reset_set_enable(PERIPH_ID_EMC, 0);
reset_set_enable(PERIPH_ID_I2C5, 0);
reset_set_enable(PERIPH_ID_FUSE, 0);
reset_set_enable(PERIPH_ID_APBDMA, 0);
reset_set_enable(PERIPH_ID_MEM, 0);
reset_set_enable(PERIPH_ID_CORESIGHT, 0);
reset_set_enable(PERIPH_ID_MSELECT, 0);
reset_set_enable(PERIPH_ID_EMC1, 0);
reset_set_enable(PERIPH_ID_MC1, 0);
reset_set_enable(PERIPH_ID_DVFS, 0);
debug("%s exit\n", __func__);
}
static bool is_partition_powered(u32 partid)
{
struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
u32 reg;
/* Get power gate status */
reg = readl(&pmc->pmc_pwrgate_status);
return !!(reg & (1 << partid));
}
static bool is_clamp_enabled(u32 partid)
{
struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
u32 reg;
/* Get clamp status. */
reg = readl(&pmc->pmc_clamp_status);
return !!(reg & (1 << partid));
}
static void power_partition(u32 partid)
{
struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
debug("%s: part ID = %08X\n", __func__, partid);
/* Is the partition already on? */
if (!is_partition_powered(partid)) {
/* No, toggle the partition power state (OFF -> ON) */
debug("power_partition, toggling state\n");
writel(START_CP | partid, &pmc->pmc_pwrgate_toggle);
/* Wait for the power to come up */
while (!is_partition_powered(partid))
;
/* Wait for the clamp status to be cleared */
while (is_clamp_enabled(partid))
;
/* Give I/O signals time to stabilize */
udelay(IO_STABILIZATION_DELAY);
}
}
void powerup_cpus(void)
{
/* We boot to the fast cluster */
debug("%s entry: G cluster\n", __func__);
/* Power up the fast cluster rail partition */
power_partition(CRAIL);
/* Power up the fast cluster non-CPU partition */
power_partition(C0NC);
/* Power up the fast cluster CPU0 partition */
power_partition(CE0);
}
void start_cpu(u32 reset_vector)
{
u32 imme, inst;
debug("%s entry, reset_vector = %x\n", __func__, reset_vector);
t114_init_clocks();
/* Enable VDD_CPU */
enable_cpu_power_rail();
/* Get the CPU(s) running */
enable_cpu_clocks();
/* Enable CoreSight */
clock_enable_coresight(1);
/* Take CPU(s) out of reset */
remove_cpu_resets();
/* Set the entry point for CPU execution from reset */
/*
* A01P with patched boot ROM; vector hard-coded to 0x4003fffc.
* See nvbug 1193357 for details.
*/
/* mov r0, #lsb(reset_vector) */
imme = reset_vector & 0xffff;
inst = imme & 0xfff;
inst |= ((imme >> 12) << 16);
inst |= 0xe3000000;
writel(inst, 0x4003fff0);
/* movt r0, #msb(reset_vector) */
imme = (reset_vector >> 16) & 0xffff;
inst = imme & 0xfff;
inst |= ((imme >> 12) << 16);
inst |= 0xe3400000;
writel(inst, 0x4003fff4);
/* bx r0 */
writel(0xe12fff10, 0x4003fff8);
/* b -12 */
imme = (u32)-20;
inst = (imme >> 2) & 0xffffff;
inst |= 0xea000000;
writel(inst, 0x4003fffc);
/* Write to original location for compatibility */
writel(reset_vector, EXCEP_VECTOR_CPU_RESET_VECTOR);
/* If the CPU(s) don't already have power, power 'em up */
powerup_cpus();
}
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