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5668c75ce9
Configure PMIC voltages for early stages using updated early i2c write. Tested-by: Thierry Reding <treding@nvidia.com> # Beaver T30 Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom <twarren@nvidia.com>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2010-2014, NVIDIA CORPORATION. All rights reserved.
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*/
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#include <common.h>
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#include <log.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/flow.h>
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#include <asm/arch/tegra.h>
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#include <asm/arch-tegra/clk_rst.h>
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#include <asm/arch-tegra/pmc.h>
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#include <asm/arch-tegra/tegra_i2c.h>
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#include <linux/delay.h>
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#include "../cpu.h"
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/* In case this function is not defined */
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__weak void pmic_enable_cpu_vdd(void) {}
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static void enable_cpu_power_rail(void)
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{
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struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
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u32 reg;
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debug("enable_cpu_power_rail entry\n");
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reg = readl(&pmc->pmc_cntrl);
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reg |= CPUPWRREQ_OE;
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writel(reg, &pmc->pmc_cntrl);
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}
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/**
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* The T30 requires some special clock initialization, including setting up
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* the dvc i2c, turning on mselect and selecting the G CPU cluster
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*/
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void t30_init_clocks(void)
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{
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struct clk_rst_ctlr *clkrst =
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(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
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struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE;
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u32 val;
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debug("t30_init_clocks entry\n");
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/* Set active CPU cluster to G */
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clrbits_le32(flow->cluster_control, 1 << 0);
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writel(SUPER_SCLK_ENB_MASK, &clkrst->crc_super_sclk_div);
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val = (0 << CLK_SYS_RATE_HCLK_DISABLE_SHIFT) |
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(1 << CLK_SYS_RATE_AHB_RATE_SHIFT) |
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(0 << CLK_SYS_RATE_PCLK_DISABLE_SHIFT) |
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(0 << CLK_SYS_RATE_APB_RATE_SHIFT);
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writel(val, &clkrst->crc_clk_sys_rate);
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/* Put i2c, mselect in reset and enable clocks */
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reset_set_enable(PERIPH_ID_DVC_I2C, 1);
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clock_set_enable(PERIPH_ID_DVC_I2C, 1);
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reset_set_enable(PERIPH_ID_MSELECT, 1);
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clock_set_enable(PERIPH_ID_MSELECT, 1);
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/* Switch MSELECT clock to PLLP (00) and use a divisor of 2 */
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clock_ll_set_source_divisor(PERIPH_ID_MSELECT, 0, 2);
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/*
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* Our high-level clock routines are not available prior to
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* relocation. We use the low-level functions which require a
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* hard-coded divisor. Use CLK_M with divide by (n + 1 = 17)
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*/
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clock_ll_set_source_divisor(PERIPH_ID_DVC_I2C, 3, 16);
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/*
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* Give clocks time to stabilize, then take i2c and mselect out of
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* reset
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*/
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udelay(1000);
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reset_set_enable(PERIPH_ID_DVC_I2C, 0);
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reset_set_enable(PERIPH_ID_MSELECT, 0);
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}
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static void set_cpu_running(int run)
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{
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struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE;
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debug("set_cpu_running entry, run = %d\n", run);
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writel(run ? FLOW_MODE_NONE : FLOW_MODE_STOP, &flow->halt_cpu_events);
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}
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void start_cpu(u32 reset_vector)
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{
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debug("start_cpu entry, reset_vector = %x\n", reset_vector);
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t30_init_clocks();
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/* Enable VDD_CPU */
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enable_cpu_power_rail();
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pmic_enable_cpu_vdd();
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set_cpu_running(0);
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/* Hold the CPUs in reset */
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reset_A9_cpu(1);
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/* Disable the CPU clock */
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enable_cpu_clock(0);
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/* Enable CoreSight */
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clock_enable_coresight(1);
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/*
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* Set the entry point for CPU execution from reset,
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* if it's a non-zero value.
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*/
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if (reset_vector)
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writel(reset_vector, EXCEP_VECTOR_CPU_RESET_VECTOR);
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/* Enable the CPU clock */
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enable_cpu_clock(1);
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/* If the CPU doesn't already have power, power it up */
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powerup_cpu();
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/* Take the CPU out of reset */
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reset_A9_cpu(0);
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set_cpu_running(1);
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}
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