diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/irqchip/irq-gic-realview.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/irqchip/irq-gic-realview.c')
-rw-r--r-- | drivers/irqchip/irq-gic-realview.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-realview.c b/drivers/irqchip/irq-gic-realview.c new file mode 100644 index 000000000..38fab02ff --- /dev/null +++ b/drivers/irqchip/irq-gic-realview.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Special GIC quirks for the ARM RealView + * Copyright (C) 2015 Linus Walleij + */ +#include <linux/of.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> +#include <linux/bitops.h> +#include <linux/irqchip.h> +#include <linux/irqchip/arm-gic.h> + +#define REALVIEW_SYS_LOCK_OFFSET 0x20 +#define REALVIEW_SYS_PLD_CTRL1 0x74 +#define REALVIEW_EB_REVB_SYS_PLD_CTRL1 0xD8 +#define VERSATILE_LOCK_VAL 0xA05F +#define PLD_INTMODE_MASK BIT(22)|BIT(23)|BIT(24) +#define PLD_INTMODE_LEGACY 0x0 +#define PLD_INTMODE_NEW_DCC BIT(22) +#define PLD_INTMODE_NEW_NO_DCC BIT(23) +#define PLD_INTMODE_FIQ_ENABLE BIT(24) + +/* For some reason RealView EB Rev B moved this register */ +static const struct of_device_id syscon_pldset_of_match[] = { + { + .compatible = "arm,realview-eb11mp-revb-syscon", + .data = (void *)REALVIEW_EB_REVB_SYS_PLD_CTRL1, + }, + { + .compatible = "arm,realview-eb11mp-revc-syscon", + .data = (void *)REALVIEW_SYS_PLD_CTRL1, + }, + { + .compatible = "arm,realview-eb-syscon", + .data = (void *)REALVIEW_SYS_PLD_CTRL1, + }, + { + .compatible = "arm,realview-pb11mp-syscon", + .data = (void *)REALVIEW_SYS_PLD_CTRL1, + }, + {}, +}; + +static int __init +realview_gic_of_init(struct device_node *node, struct device_node *parent) +{ + struct regmap *map; + struct device_node *np; + const struct of_device_id *gic_id; + u32 pld1_ctrl; + + np = of_find_matching_node_and_match(NULL, syscon_pldset_of_match, + &gic_id); + if (!np) + return -ENODEV; + pld1_ctrl = (u32)gic_id->data; + + /* The PB11MPCore GIC needs to be configured in the syscon */ + map = syscon_node_to_regmap(np); + of_node_put(np); + if (!IS_ERR(map)) { + /* new irq mode with no DCC */ + regmap_write(map, REALVIEW_SYS_LOCK_OFFSET, + VERSATILE_LOCK_VAL); + regmap_update_bits(map, pld1_ctrl, + PLD_INTMODE_NEW_NO_DCC, + PLD_INTMODE_MASK); + regmap_write(map, REALVIEW_SYS_LOCK_OFFSET, 0x0000); + pr_info("RealView GIC: set up interrupt controller to NEW mode, no DCC\n"); + } else { + pr_err("RealView GIC setup: could not find syscon\n"); + return -ENODEV; + } + return gic_of_init(node, parent); +} +IRQCHIP_DECLARE(armtc11mp_gic, "arm,tc11mp-gic", realview_gic_of_init); +IRQCHIP_DECLARE(armeb11mp_gic, "arm,eb11mp-gic", realview_gic_of_init); |