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Diffstat (limited to 'drivers/arm/gic/v3/gic-x00.c')
-rw-r--r--drivers/arm/gic/v3/gic-x00.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/arm/gic/v3/gic-x00.c b/drivers/arm/gic/v3/gic-x00.c
new file mode 100644
index 0000000..83ef32f
--- /dev/null
+++ b/drivers/arm/gic/v3/gic-x00.c
@@ -0,0 +1,232 @@
+/*
+ * Copyright (c) 2017-2022, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * Driver for GIC-500 and GIC-600 specific features. This driver only
+ * overrides APIs that are different to those generic ones in GICv3
+ * driver.
+ *
+ * GIC-600 supports independently power-gating redistributor interface.
+ */
+
+#include <assert.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/arm/arm_gicv3_common.h>
+#include <drivers/arm/gicv3.h>
+
+#include "gicv3_private.h"
+
+/* GIC-600 specific register offsets */
+#define GICR_PWRR 0x24U
+
+/* GICR_PWRR fields */
+#define PWRR_RDPD_SHIFT 0
+#define PWRR_RDAG_SHIFT 1
+#define PWRR_RDGPD_SHIFT 2
+#define PWRR_RDGPO_SHIFT 3
+
+#define PWRR_RDPD (1U << PWRR_RDPD_SHIFT)
+#define PWRR_RDAG (1U << PWRR_RDAG_SHIFT)
+#define PWRR_RDGPD (1U << PWRR_RDGPD_SHIFT)
+#define PWRR_RDGPO (1U << PWRR_RDGPO_SHIFT)
+
+/*
+ * Values to write to GICR_PWRR register to power redistributor
+ * for operating through the core (GICR_PWRR.RDAG = 0)
+ */
+#define PWRR_ON (0U << PWRR_RDPD_SHIFT)
+#define PWRR_OFF (1U << PWRR_RDPD_SHIFT)
+
+static bool gic600_errata_wa_2384374 __unused;
+
+#if GICV3_SUPPORT_GIC600
+
+/* GIC-600/700 specific accessor functions */
+static void gicr_write_pwrr(uintptr_t base, unsigned int val)
+{
+ mmio_write_32(base + GICR_PWRR, val);
+}
+
+static uint32_t gicr_read_pwrr(uintptr_t base)
+{
+ return mmio_read_32(base + GICR_PWRR);
+}
+
+static void gicr_wait_group_not_in_transit(uintptr_t base)
+{
+ uint32_t pwrr;
+
+ do {
+ pwrr = gicr_read_pwrr(base);
+
+ /* Check group not transitioning: RDGPD == RDGPO */
+ } while (((pwrr & PWRR_RDGPD) >> PWRR_RDGPD_SHIFT) !=
+ ((pwrr & PWRR_RDGPO) >> PWRR_RDGPO_SHIFT));
+}
+
+static void gic600_pwr_on(uintptr_t base)
+{
+ do { /* Wait until group not transitioning */
+ gicr_wait_group_not_in_transit(base);
+
+ /* Power on redistributor */
+ gicr_write_pwrr(base, PWRR_ON);
+
+ /*
+ * Wait until the power on state is reflected.
+ * If RDPD == 0 then powered on.
+ */
+ } while ((gicr_read_pwrr(base) & PWRR_RDPD) != PWRR_ON);
+}
+
+static void gic600_pwr_off(uintptr_t base)
+{
+ /* Wait until group not transitioning */
+ gicr_wait_group_not_in_transit(base);
+
+ /* Power off redistributor */
+ gicr_write_pwrr(base, PWRR_OFF);
+
+ /*
+ * If this is the last man, turning this redistributor frame off will
+ * result in the group itself being powered off and RDGPD = 1.
+ * In that case, wait as long as it's in transition, or has aborted
+ * the transition altogether for any reason.
+ */
+ if ((gicr_read_pwrr(base) & PWRR_RDGPD) != 0U) {
+ /* Wait until group not transitioning */
+ gicr_wait_group_not_in_transit(base);
+ }
+}
+
+static uintptr_t get_gicr_base(unsigned int proc_num)
+{
+ uintptr_t gicr_base;
+
+ assert(gicv3_driver_data != NULL);
+ assert(proc_num < gicv3_driver_data->rdistif_num);
+ assert(gicv3_driver_data->rdistif_base_addrs != NULL);
+
+ gicr_base = gicv3_driver_data->rdistif_base_addrs[proc_num];
+ assert(gicr_base != 0UL);
+
+ return gicr_base;
+}
+
+static bool gicv3_redists_need_power_mgmt(uintptr_t gicr_base)
+{
+ uint32_t reg = mmio_read_32(gicr_base + GICR_IIDR);
+
+ /*
+ * The Arm GIC-600 and GIC-700 models have their redistributors
+ * powered down at reset.
+ */
+ return (((reg & IIDR_MODEL_MASK) == IIDR_MODEL_ARM_GIC_600) ||
+ ((reg & IIDR_MODEL_MASK) == IIDR_MODEL_ARM_GIC_600AE) ||
+ ((reg & IIDR_MODEL_MASK) == IIDR_MODEL_ARM_GIC_700));
+}
+
+#endif /* GICV3_SUPPORT_GIC600 */
+
+void gicv3_distif_pre_save(unsigned int proc_num)
+{
+ arm_gicv3_distif_pre_save(proc_num);
+}
+
+void gicv3_distif_post_restore(unsigned int proc_num)
+{
+ arm_gicv3_distif_post_restore(proc_num);
+}
+
+/*
+ * Power off GIC-600 redistributor (if configured and detected)
+ */
+void gicv3_rdistif_off(unsigned int proc_num)
+{
+#if GICV3_SUPPORT_GIC600
+ uintptr_t gicr_base = get_gicr_base(proc_num);
+
+ /* Attempt to power redistributor off */
+ if (gicv3_redists_need_power_mgmt(gicr_base)) {
+ gic600_pwr_off(gicr_base);
+ }
+#endif
+}
+
+/*
+ * Power on GIC-600 redistributor (if configured and detected)
+ */
+void gicv3_rdistif_on(unsigned int proc_num)
+{
+#if GICV3_SUPPORT_GIC600
+ uintptr_t gicr_base = get_gicr_base(proc_num);
+
+ /* Power redistributor on */
+ if (gicv3_redists_need_power_mgmt(gicr_base)) {
+ gic600_pwr_on(gicr_base);
+ }
+#endif
+}
+
+#if GIC600_ERRATA_WA_2384374
+/*******************************************************************************
+ * Apply part 2 of workaround for errata-2384374 as per SDEN:
+ * https://developer.arm.com/documentation/sden892601/latest/
+ ******************************************************************************/
+void gicv3_apply_errata_wa_2384374(uintptr_t gicr_base)
+{
+ if (gic600_errata_wa_2384374) {
+ uint32_t gicr_ctlr_val = gicr_read_ctlr(gicr_base);
+
+ gicr_write_ctlr(gicr_base, gicr_ctlr_val |
+ (GICR_CTLR_DPG0_BIT | GICR_CTLR_DPG1NS_BIT |
+ GICR_CTLR_DPG1S_BIT));
+ gicr_write_ctlr(gicr_base, gicr_ctlr_val &
+ ~(GICR_CTLR_DPG0_BIT | GICR_CTLR_DPG1NS_BIT |
+ GICR_CTLR_DPG1S_BIT));
+ }
+}
+#endif /* GIC600_ERRATA_WA_2384374 */
+
+void gicv3_check_erratas_applies(uintptr_t gicd_base)
+{
+ unsigned int gic_prod_id;
+ uint8_t gic_rev;
+
+ assert(gicd_base != 0UL);
+
+ gicv3_get_component_prodid_rev(gicd_base, &gic_prod_id, &gic_rev);
+
+ /*
+ * This workaround applicable only to GIC600 and GIC600AE products with
+ * revision less than r1p6 and r0p2 respectively.
+ * As per GIC600/GIC600AE specification -
+ * r1p6 = 0x17 => GICD_IIDR[19:12]
+ * r0p2 = 0x04 => GICD_IIDR[19:12]
+ */
+ if ((gic_prod_id == GIC_PRODUCT_ID_GIC600) ||
+ (gic_prod_id == GIC_PRODUCT_ID_GIC600AE)) {
+ if (((gic_prod_id == GIC_PRODUCT_ID_GIC600) &&
+ (gic_rev <= GIC_REV(GIC_VARIANT_R1, GIC_REV_P6))) ||
+ ((gic_prod_id == GIC_PRODUCT_ID_GIC600AE) &&
+ (gic_rev <= GIC_REV(GIC_VARIANT_R0, GIC_REV_P2)))) {
+#if GIC600_ERRATA_WA_2384374
+ gic600_errata_wa_2384374 = true;
+ VERBOSE("%s applies\n",
+ "GIC600/GIC600AE errata workaround 2384374");
+#else
+ WARN("%s missing\n",
+ "GIC600/GIC600AE errata workaround 2384374");
+#endif /* GIC600_ERRATA_WA_2384374 */
+ } else {
+ VERBOSE("%s not applies\n",
+ "GIC600/GIC600AE errata workaround 2384374");
+ }
+ }
+}