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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright 2019 Broadcom.
- */
- #include <common.h>
- #include <asm/gic.h>
- #include <asm/gic-v3.h>
- #include <asm/io.h>
- #include <linux/bitops.h>
- #include <linux/sizes.h>
- static u32 lpi_id_bits;
- #define LPI_NRBITS lpi_id_bits
- #define LPI_PROPBASE_SZ ALIGN(BIT(LPI_NRBITS), SZ_64K)
- #define LPI_PENDBASE_SZ ALIGN(BIT(LPI_NRBITS) / 8, SZ_64K)
- /*
- * Program the GIC LPI configuration tables for all
- * the re-distributors and enable the LPI table
- * base: Configuration table address
- * num_redist: number of redistributors
- */
- int gic_lpi_tables_init(u64 base, u32 num_redist)
- {
- u32 gicd_typer;
- u64 val;
- u64 tmp;
- int i;
- u64 redist_lpi_base;
- u64 pend_base = GICR_BASE + GICR_PENDBASER;
- gicd_typer = readl(GICD_BASE + GICD_TYPER);
- /* GIC support for Locality specific peripheral interrupts (LPI's) */
- if (!(gicd_typer & GICD_TYPER_LPIS)) {
- pr_err("GIC implementation does not support LPI's\n");
- return -EINVAL;
- }
- /*
- * Check for LPI is disabled for all the redistributors.
- * Once the LPI table is enabled, can not program the
- * LPI configuration tables again, unless the GIC is reset.
- */
- for (i = 0; i < num_redist; i++) {
- u32 offset = i * GIC_REDISTRIBUTOR_OFFSET;
- if ((readl((uintptr_t)(GICR_BASE + offset))) &
- GICR_CTLR_ENABLE_LPIS) {
- pr_err("Re-Distributor %d LPI is already enabled\n",
- i);
- return -EINVAL;
- }
- }
- /* lpi_id_bits to get LPI_PENDBASE_SZ and LPi_PROPBASE_SZ */
- lpi_id_bits = min_t(u32, GICD_TYPER_ID_BITS(gicd_typer),
- ITS_MAX_LPI_NRBITS);
- /* Set PropBase */
- val = (base |
- GICR_PROPBASER_INNERSHAREABLE |
- GICR_PROPBASER_RAWAWB |
- ((LPI_NRBITS - 1) & GICR_PROPBASER_IDBITS_MASK));
- writeq(val, (GICR_BASE + GICR_PROPBASER));
- tmp = readl(GICR_BASE + GICR_PROPBASER);
- if ((tmp ^ val) & GICR_PROPBASER_SHAREABILITY_MASK) {
- if (!(tmp & GICR_PROPBASER_SHAREABILITY_MASK)) {
- val &= ~(GICR_PROPBASER_SHAREABILITY_MASK |
- GICR_PROPBASER_CACHEABILITY_MASK);
- val |= GICR_PROPBASER_NC;
- writeq(val, (GICR_BASE + GICR_PROPBASER));
- }
- }
- redist_lpi_base = base + LPI_PROPBASE_SZ;
- for (i = 0; i < num_redist; i++) {
- u32 offset = i * GIC_REDISTRIBUTOR_OFFSET;
- val = ((redist_lpi_base + (i * LPI_PENDBASE_SZ)) |
- GICR_PENDBASER_INNERSHAREABLE |
- GICR_PENDBASER_RAWAWB);
- writeq(val, (uintptr_t)(pend_base + offset));
- tmp = readq((uintptr_t)(pend_base + offset));
- if (!(tmp & GICR_PENDBASER_SHAREABILITY_MASK)) {
- val &= ~(GICR_PENDBASER_SHAREABILITY_MASK |
- GICR_PENDBASER_CACHEABILITY_MASK);
- val |= GICR_PENDBASER_NC;
- writeq(val, (uintptr_t)(pend_base + offset));
- }
- /* Enable LPI for the redistributor */
- writel(GICR_CTLR_ENABLE_LPIS, (uintptr_t)(GICR_BASE + offset));
- }
- return 0;
- }
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