power.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/mmio.h>
#include <console/console.h>
#include <soc/addressmap.h>
#include <soc/clock.h>
#include <soc/flow.h>
#include <soc/pmc.h>
#include <soc/power.h>
 
static struct tegra_pmc_regs * const pmc = (void *)TEGRA_PMC_BASE;
static struct flow_ctlr * const flow = (void *)TEGRA_FLOW_BASE;
 
static int partition_powered(int id)
{
        return read32(&pmc->pwrgate_status) & (0x1 << id);
}
 
static int partition_clamp_on(int id)
{
        return read32(&pmc->clamp_status) & (0x1 << id);
}
 
static void power_ungate_partition(uint32_t id)
{
        printk(BIOS_INFO, "Ungating power partition %d.\n", id);
 
        if (!partition_powered(id)) {
                uint32_t pwrgate_toggle = read32(&pmc->pwrgate_toggle);
                pwrgate_toggle &= ~(PMC_PWRGATE_TOGGLE_PARTID_MASK);
                pwrgate_toggle |= (id << PMC_PWRGATE_TOGGLE_PARTID_SHIFT);
                pwrgate_toggle |= PMC_PWRGATE_TOGGLE_START;
                write32(&pmc->pwrgate_toggle, pwrgate_toggle);
 
                // Wait for the request to be accepted.
                while (read32(&pmc->pwrgate_toggle) & PMC_PWRGATE_TOGGLE_START)
                        ;
                printk(BIOS_DEBUG, "Power gate toggle request accepted.\n");
 
                // Wait for the partition to be powered.
                while (!partition_powered(id))
                        ;
 
                // Wait for clamp off.
                while (partition_clamp_on(id))
                        ;
        }
 
        printk(BIOS_INFO, "Ungated power partition %d.\n", id);
}
 
void power_enable_and_ungate_cpu(void)
{
        /*
         * Set CPUPWRGOOD_TIMER - APB clock is 1/2 of SCLK (150MHz),
         * set it for 5ms as per SysEng (5ms * PCLK_KHZ * 1000 / 1s).
         */
        write32(&pmc->cpupwrgood_timer, (TEGRA_PCLK_KHZ * 5));
 
        uint32_t cntrl = read32(&pmc->cntrl);
        cntrl &= ~PMC_CNTRL_CPUPWRREQ_POLARITY;
        cntrl |= PMC_CNTRL_CPUPWRREQ_OE;
        write32(&pmc->cntrl, cntrl);
 
        power_ungate_partition(POWER_PARTID_CRAIL);
 
        // Ungate power to the non-core parts of the fast cluster.
        power_ungate_partition(POWER_PARTID_C0NC);
 
        // Ungate power to CPU0 in the fast cluster.
        power_ungate_partition(POWER_PARTID_CE0);
}
 
int power_reset_status(void)
{
        return read32(&pmc->rst_status) & 0x7;
}
 
void ram_repair(void)
{
        // Request RAM repair for cluster 0
        setbits32(&flow->ram_repair, RAM_REPAIR_REQ);
        // Poll for completion
        while (!(read32(&flow->ram_repair) & RAM_REPAIR_STS))
                ;
        // Request RAM repair for cluster 1
        setbits32(&flow->ram_repair_cluster1, RAM_REPAIR_REQ);
        // Poll for completion
        while (!(read32(&flow->ram_repair_cluster1) & RAM_REPAIR_STS))
                ;
}