236 lines
6.7 KiB
C
236 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2010 - 2011
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* NVIDIA Corporation <www.nvidia.com>
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*/
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#include <common.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/pinmux.h>
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#include <asm/arch/tegra.h>
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#include <asm/arch-tegra/ap.h>
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#include <asm/arch-tegra/apb_misc.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/warmboot.h>
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#include "warmboot_avp.h"
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#define DEBUG_RESET_CORESIGHT
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void wb_start(void)
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{
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struct apb_misc_pp_ctlr *apb_misc =
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(struct apb_misc_pp_ctlr *)NV_PA_APB_MISC_BASE;
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struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
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struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE;
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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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union osc_ctrl_reg osc_ctrl;
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union pllx_base_reg pllx_base;
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union pllx_misc_reg pllx_misc;
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union scratch3_reg scratch3;
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u32 reg;
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/* enable JTAG & TBE */
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writel(CONFIG_CTL_TBE | CONFIG_CTL_JTAG, &apb_misc->cfg_ctl);
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/* Are we running where we're supposed to be? */
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asm volatile (
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"adr %0, wb_start;" /* reg: wb_start address */
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: "=r"(reg) /* output */
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/* no input, no clobber list */
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);
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if (reg != NV_WB_RUN_ADDRESS)
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goto do_reset;
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/* Are we running with AVP? */
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if (readl(NV_PA_PG_UP_BASE + PG_UP_TAG_0) != PG_UP_TAG_AVP)
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goto do_reset;
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#ifdef DEBUG_RESET_CORESIGHT
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/* Assert CoreSight reset */
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reg = readl(&clkrst->crc_rst_dev[TEGRA_DEV_U]);
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reg |= SWR_CSITE_RST;
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writel(reg, &clkrst->crc_rst_dev[TEGRA_DEV_U]);
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#endif
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/* TODO: Set the drive strength - maybe make this a board parameter? */
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osc_ctrl.word = readl(&clkrst->crc_osc_ctrl);
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osc_ctrl.xofs = 4;
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osc_ctrl.xoe = 1;
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writel(osc_ctrl.word, &clkrst->crc_osc_ctrl);
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/* Power up the CPU complex if necessary */
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if (!(readl(&pmc->pmc_pwrgate_status) & PWRGATE_STATUS_CPU)) {
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reg = PWRGATE_TOGGLE_PARTID_CPU | PWRGATE_TOGGLE_START;
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writel(reg, &pmc->pmc_pwrgate_toggle);
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while (!(readl(&pmc->pmc_pwrgate_status) & PWRGATE_STATUS_CPU))
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;
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}
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/* Remove the I/O clamps from the CPU power partition. */
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reg = readl(&pmc->pmc_remove_clamping);
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reg |= CPU_CLMP;
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writel(reg, &pmc->pmc_remove_clamping);
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reg = EVENT_ZERO_VAL_20 | EVENT_MSEC | EVENT_MODE_STOP;
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writel(reg, &flow->halt_cop_events);
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/* Assert CPU complex reset */
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reg = readl(&clkrst->crc_rst_dev[TEGRA_DEV_L]);
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reg |= CPU_RST;
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writel(reg, &clkrst->crc_rst_dev[TEGRA_DEV_L]);
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/* Hold both CPUs in reset */
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reg = CPU_CMPLX_CPURESET0 | CPU_CMPLX_CPURESET1 | CPU_CMPLX_DERESET0 |
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CPU_CMPLX_DERESET1 | CPU_CMPLX_DBGRESET0 | CPU_CMPLX_DBGRESET1;
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writel(reg, &clkrst->crc_cpu_cmplx_set);
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/* Halt CPU1 at the flow controller for uni-processor configurations */
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writel(EVENT_MODE_STOP, &flow->halt_cpu1_events);
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/*
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* Set the CPU reset vector. SCRATCH41 contains the physical
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* address of the CPU-side restoration code.
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*/
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reg = readl(&pmc->pmc_scratch41);
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writel(reg, EXCEP_VECTOR_CPU_RESET_VECTOR);
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/* Select CPU complex clock source */
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writel(CCLK_PLLP_BURST_POLICY, &clkrst->crc_cclk_brst_pol);
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/* Start the CPU0 clock and stop the CPU1 clock */
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reg = CPU_CMPLX_CPU_BRIDGE_CLKDIV_4 | CPU_CMPLX_CPU0_CLK_STP_RUN |
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CPU_CMPLX_CPU1_CLK_STP_STOP;
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writel(reg, &clkrst->crc_clk_cpu_cmplx);
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/* Enable the CPU complex clock */
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reg = readl(&clkrst->crc_clk_out_enb[TEGRA_DEV_L]);
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reg |= CLK_ENB_CPU;
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writel(reg, &clkrst->crc_clk_out_enb[TEGRA_DEV_L]);
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/* Make sure the resets were held for at least 2 microseconds */
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reg = readl(TIMER_USEC_CNTR);
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while (readl(TIMER_USEC_CNTR) <= (reg + 2))
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;
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#ifdef DEBUG_RESET_CORESIGHT
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/*
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* De-assert CoreSight reset.
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* NOTE: We're leaving the CoreSight clock on the oscillator for
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* now. It will be restored to its original clock source
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* when the CPU-side restoration code runs.
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*/
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reg = readl(&clkrst->crc_rst_dev[TEGRA_DEV_U]);
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reg &= ~SWR_CSITE_RST;
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writel(reg, &clkrst->crc_rst_dev[TEGRA_DEV_U]);
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#endif
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/* Unlock the CPU CoreSight interfaces */
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reg = 0xC5ACCE55;
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writel(reg, CSITE_CPU_DBG0_LAR);
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writel(reg, CSITE_CPU_DBG1_LAR);
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/*
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* Sample the microsecond timestamp again. This is the time we must
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* use when returning from LP0 for PLL stabilization delays.
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*/
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reg = readl(TIMER_USEC_CNTR);
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writel(reg, &pmc->pmc_scratch1);
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pllx_base.word = 0;
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pllx_misc.word = 0;
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scratch3.word = readl(&pmc->pmc_scratch3);
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/* Get the OSC. For 19.2 MHz, use 19 to make the calculations easier */
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reg = (readl(TIMER_USEC_CFG) & USEC_CFG_DIVISOR_MASK) + 1;
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/*
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* According to the TRM, for 19.2MHz OSC, the USEC_DIVISOR is 0x5f, and
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* USEC_DIVIDEND is 0x04. So, if USEC_DIVISOR > 26, OSC is 19.2 MHz.
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*
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* reg is used to calculate the pllx freq, which is used to determine if
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* to set dccon or not.
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*/
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if (reg > 26)
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reg = 19;
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/* PLLX_BASE.PLLX_DIVM */
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if (scratch3.pllx_base_divm == reg)
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reg = 0;
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else
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reg = 1;
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/* PLLX_BASE.PLLX_DIVN */
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pllx_base.divn = scratch3.pllx_base_divn;
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reg = scratch3.pllx_base_divn << reg;
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/* PLLX_BASE.PLLX_DIVP */
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pllx_base.divp = scratch3.pllx_base_divp;
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reg = reg >> scratch3.pllx_base_divp;
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pllx_base.bypass = 1;
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/* PLLX_MISC_DCCON must be set for pllx frequency > 600 MHz. */
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if (reg > 600)
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pllx_misc.dccon = 1;
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/* PLLX_MISC_LFCON */
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pllx_misc.lfcon = scratch3.pllx_misc_lfcon;
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/* PLLX_MISC_CPCON */
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pllx_misc.cpcon = scratch3.pllx_misc_cpcon;
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writel(pllx_misc.word, &clkrst->crc_pll_simple[SIMPLE_PLLX].pll_misc);
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writel(pllx_base.word, &clkrst->crc_pll_simple[SIMPLE_PLLX].pll_base);
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pllx_base.enable = 1;
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writel(pllx_base.word, &clkrst->crc_pll_simple[SIMPLE_PLLX].pll_base);
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pllx_base.bypass = 0;
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writel(pllx_base.word, &clkrst->crc_pll_simple[SIMPLE_PLLX].pll_base);
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writel(0, flow->halt_cpu_events);
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reg = CPU_CMPLX_CPURESET0 | CPU_CMPLX_DBGRESET0 | CPU_CMPLX_DERESET0;
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writel(reg, &clkrst->crc_cpu_cmplx_clr);
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reg = PLLM_OUT1_RSTN_RESET_DISABLE | PLLM_OUT1_CLKEN_ENABLE |
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PLLM_OUT1_RATIO_VAL_8;
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writel(reg, &clkrst->crc_pll[CLOCK_ID_MEMORY].pll_out[0]);
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reg = SCLK_SWAKE_FIQ_SRC_PLLM_OUT1 | SCLK_SWAKE_IRQ_SRC_PLLM_OUT1 |
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SCLK_SWAKE_RUN_SRC_PLLM_OUT1 | SCLK_SWAKE_IDLE_SRC_PLLM_OUT1 |
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SCLK_SYS_STATE_IDLE;
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writel(reg, &clkrst->crc_sclk_brst_pol);
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/* avp_resume: no return after the write */
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reg = readl(&clkrst->crc_rst_dev[TEGRA_DEV_L]);
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reg &= ~CPU_RST;
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writel(reg, &clkrst->crc_rst_dev[TEGRA_DEV_L]);
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/* avp_halt: */
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avp_halt:
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reg = EVENT_MODE_STOP | EVENT_JTAG;
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writel(reg, flow->halt_cop_events);
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goto avp_halt;
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do_reset:
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/*
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* Execution comes here if something goes wrong. The chip is reset and
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* a cold boot is performed.
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*/
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writel(SWR_TRIG_SYS_RST, &clkrst->crc_rst_dev[TEGRA_DEV_L]);
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goto do_reset;
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}
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/*
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* wb_end() is a dummy function, and must be directly following wb_start(),
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* and is used to calculate the size of wb_start().
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*/
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void wb_end(void)
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{
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}
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