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