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SubjectRE: [PATCH v2 2/5] irqchip: Add RZ/G2L IA55 Interrupt Controller driver
Date
Hi Prabhakar,

> Subject: Re: [PATCH v2 2/5] irqchip: Add RZ/G2L IA55 Interrupt Controller
> driver
>
> Hi Biju,
>
> Thank you for the patch.
>
> On Mon, May 9, 2022 at 8:22 AM Biju Das <biju.das.jz@bp.renesas.com> wrote:
> >
> > Hi Prabhakar,
> >
> > Thanks for the patch.
> >
> > > Subject: [PATCH v2 2/5] irqchip: Add RZ/G2L IA55 Interrupt
> > > Controller driver
> > >
> > > Add a driver for the Renesas RZ/G2L Interrupt Controller.
> > >
> > > This supports external pins being used as interrupts. It supports
> > > one line for NMI, 8 external pins and 32 GPIO pins (out of 123) to
> > > be used as IRQ lines.
> > >
> > > Signed-off-by: Lad Prabhakar
> > > <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > ---
> > > drivers/irqchip/Kconfig | 8 +
> > > drivers/irqchip/Makefile | 1 +
> > > drivers/irqchip/irq-renesas-rzg2l.c | 445
> > > ++++++++++++++++++++++++++++
> > > 3 files changed, 454 insertions(+)
> > > create mode 100644 drivers/irqchip/irq-renesas-rzg2l.c
> > >
> > > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index
> > > 15edb9a6fcae..f3d071422f3b 100644
> > > --- a/drivers/irqchip/Kconfig
> > > +++ b/drivers/irqchip/Kconfig
> > > @@ -242,6 +242,14 @@ config RENESAS_RZA1_IRQC
> > > Enable support for the Renesas RZ/A1 Interrupt Controller,
> > > to use up
> > > to 8 external interrupts with configurable sense select.
> > >
> > > +config RENESAS_RZG2L_IRQC
> > > + bool "Renesas RZ/G2L (and alike SoC) IRQC support" if
> COMPILE_TEST
> > > + select GENERIC_IRQ_CHIP
> > > + select IRQ_DOMAIN_HIERARCHY
> > > + help
> > > + Enable support for the Renesas RZ/G2L (and alike SoC)
> > > +Interrupt
> > > Controller
> > > + for external devices.
> > > +
> > > config SL28CPLD_INTC
> > > bool "Kontron sl28cpld IRQ controller"
> > > depends on MFD_SL28CPLD=y || COMPILE_TEST diff --git
> > > a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index
> > > 160a1d8ceaa9..eaa56eec2b23 100644
> > > --- a/drivers/irqchip/Makefile
> > > +++ b/drivers/irqchip/Makefile
> > > @@ -51,6 +51,7 @@ obj-$(CONFIG_RDA_INTC) += irq-
> rda-intc.o
> > > obj-$(CONFIG_RENESAS_INTC_IRQPIN) += irq-renesas-intc-irqpin.o
> > > obj-$(CONFIG_RENESAS_IRQC) += irq-renesas-irqc.o
> > > obj-$(CONFIG_RENESAS_RZA1_IRQC) += irq-renesas-rza1.o
> > > +obj-$(CONFIG_RENESAS_RZG2L_IRQC) += irq-renesas-rzg2l.o
> > > obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
> > > obj-$(CONFIG_ARCH_NSPIRE) += irq-zevio.o
> > > obj-$(CONFIG_ARCH_VT8500) += irq-vt8500.o
> > > diff --git a/drivers/irqchip/irq-renesas-rzg2l.c
> > > b/drivers/irqchip/irq- renesas-rzg2l.c new file mode 100644 index
> > > 000000000000..bd6e82100caf
> > > --- /dev/null
> > > +++ b/drivers/irqchip/irq-renesas-rzg2l.c
> > > @@ -0,0 +1,445 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Renesas RZ/G2L IRQC Driver
> > > + *
> > > + * Copyright (C) 2022 Renesas Electronics Corporation.
> > > + *
> > > + * Author: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > + */
> > > +
> > > +#include <linux/clk.h>
> > > +#include <linux/err.h>
> > > +#include <linux/io.h>
> > > +#include <linux/irqchip.h>
> > > +#include <linux/irqdomain.h>
> > > +#include <linux/of_address.h>
> > > +#include <linux/reset.h>
> > > +#include <linux/spinlock.h>
> > > +
> > > +#define IRQC_IRQ_START 1
> > > +#define IRQC_IRQ_COUNT 8
> > > +#define IRQC_TINT_START (IRQC_IRQ_START +
> IRQC_IRQ_COUNT)
> > > +#define IRQC_TINT_COUNT 32
> > > +#define IRQC_NUM_IRQ (IRQC_TINT_START +
> IRQC_TINT_COUNT)
> > > +
> > > +#define ISCR 0x10
> > > +#define IITSR 0x14
> > > +#define TSCR 0x20
> > > +#define TITSR0 0x24
> > > +#define TITSR1 0x28
> > > +#define TITSR0_MAX_INT 16
> > > +#define TITSEL_WIDTH 0x2
> > > +#define TSSR(n) (0x30 + ((n) * 4))
> > > +#define TIEN BIT(7)
> > > +#define TSSEL_SHIFT(n) (8 * (n))
> > > +#define TSSEL_MASK GENMASK(7, 0)
> > > +#define IRQ_MASK 0x3
> > > +
> > > +#define TSSR_OFFSET(n) ((n) % 4)
> > > +#define TSSR_INDEX(n) ((n) / 4)
> > > +
> > > +#define TITSR_TITSEL_EDGE_RISING 0
> > > +#define TITSR_TITSEL_EDGE_FALLING 1
> > > +#define TITSR_TITSEL_LEVEL_HIGH 2
> > > +#define TITSR_TITSEL_LEVEL_LOW 3
> > > +
> > > +#define IITSR_IITSEL(n, sense) ((sense) << ((n) * 2))
> > > +#define IITSR_IITSEL_LEVEL_LOW 0
> > > +#define IITSR_IITSEL_EDGE_FALLING 1
> > > +#define IITSR_IITSEL_EDGE_RISING 2
> > > +#define IITSR_IITSEL_EDGE_BOTH 3
> > > +#define IITSR_IITSEL_MASK(n) IITSR_IITSEL((n), 3)
> > > +
> > > +#define TINT_EXTRACT_HWIRQ(x) ((x) & ~GENMASK(31, 16))
> > > +#define TINT_EXTRACT_GPIOINT(x) ((x) >> 16)
> > > +
> > > +struct rzg2l_irqc_priv {
> > > + void __iomem *base;
> > > + struct of_phandle_args map[IRQC_NUM_IRQ];
> > > + raw_spinlock_t lock;
> > > +};
> > > +
> > > +struct rzg2l_irqc_chip_data {
> > > + int tint;
> > > +};
> > > +
> > > +static struct rzg2l_irqc_priv *irq_data_to_priv(struct irq_data
> > > +*data) {
> > > + return data->domain->host_data; }
> > > +
> > > +static void rzg2l_irq_eoi(struct irq_data *d) {
> > > + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
> > > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > > + u32 bit = BIT(hw_irq);
> > > + u32 reg;
> > > +
> > > + reg = readl_relaxed(priv->base + ISCR);
> > > + if (reg & bit)
> > > + writel_relaxed(reg & ~bit, priv->base + ISCR); }
> > > +
> > > +static void rzg2l_tint_eoi(struct irq_data *d) {
> > > + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_TINT_START;
> > > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > > + u32 bit = BIT(hw_irq);
> > > + u32 reg;
> > > +
> > > + reg = readl_relaxed(priv->base + TSCR);
> > > + if (reg & bit)
> > > + writel_relaxed(reg & ~bit, priv->base + TSCR); }
> > > +
> > > +static void rzg2l_irqc_eoi(struct irq_data *d) {
> > > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > > + unsigned int hw_irq = irqd_to_hwirq(d);
> > > +
> > > + raw_spin_lock(&priv->lock);
> > > + if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT)
> > > + rzg2l_irq_eoi(d);
> > > + else if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT)
> > > + rzg2l_tint_eoi(d);
> > > + raw_spin_unlock(&priv->lock);
> > > + irq_chip_eoi_parent(d);
> > > +}
> > > +
> > > +static void rzg2l_irqc_irq_disable(struct irq_data *d) {
> > > + unsigned int hw_irq = irqd_to_hwirq(d);
> > > +
> > > + if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT) {
> > > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > > + u32 offset = hw_irq - IRQC_TINT_START;
> > > + u32 tssr_offset = TSSR_OFFSET(offset);
> > > + u8 tssr_index = TSSR_INDEX(offset);
> > > + u32 reg;
> > > +
> > > + raw_spin_lock(&priv->lock);
> > > + reg = readl_relaxed(priv->base + TSSR(tssr_index));
> > > + reg &= ~(TSSEL_MASK << tssr_offset);
> > > + writel_relaxed(reg, priv->base + TSSR(tssr_index));
> > > + raw_spin_unlock(&priv->lock);
> > > + }
> > > + irq_chip_disable_parent(d);
> > > +}
> > > +
> > > +static void rzg2l_irqc_irq_enable(struct irq_data *d) {
> > > + unsigned int hw_irq = irqd_to_hwirq(d);
> > > +
> > > + if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT) {
> > > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > > + struct rzg2l_irqc_chip_data *chip_data = d->chip_data;
> > > + u32 offset = hw_irq - IRQC_TINT_START;
> > > + u32 tssr_offset = TSSR_OFFSET(offset);
> > > + u8 tssr_index = TSSR_INDEX(offset);
> > > + u32 reg;
> > > +
> > > + raw_spin_lock(&priv->lock);
> > > + reg = readl_relaxed(priv->base + TSSR(tssr_index));
> > > + reg |= (TIEN | chip_data->tint) <<
> TSSEL_SHIFT(tssr_offset);
> > > + writel_relaxed(reg, priv->base + TSSR(tssr_index));
> > > + raw_spin_unlock(&priv->lock);
> > > + }
> > > + irq_chip_enable_parent(d);
> > > +}
> > > +
> > > +static int rzg2l_irq_set_type(struct irq_data *d, unsigned int type) {
> > > + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
> > > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > > + u16 sense, tmp;
> > > +
> > > + switch (type & IRQ_TYPE_SENSE_MASK) {
> > > + case IRQ_TYPE_LEVEL_LOW:
> > > + sense = IITSR_IITSEL_LEVEL_LOW;
> > > + break;
> > > +
> > > + case IRQ_TYPE_EDGE_FALLING:
> > > + sense = IITSR_IITSEL_EDGE_FALLING;
> > > + break;
> > > +
> > > + case IRQ_TYPE_EDGE_RISING:
> > > + sense = IITSR_IITSEL_EDGE_RISING;
> > > + break;
> > > +
> > > + case IRQ_TYPE_EDGE_BOTH:
> > > + sense = IITSR_IITSEL_EDGE_BOTH;
> > > + break;
> > > +
> > > + default:
> > > + return -EINVAL;
> > > + }
> > > +
> > > + raw_spin_lock(&priv->lock);
> > > + tmp = readl_relaxed(priv->base + IITSR);
> > > + tmp &= ~IITSR_IITSEL_MASK(hw_irq);
> > > + tmp |= IITSR_IITSEL(hw_irq, sense);
> > > + writel_relaxed(tmp, priv->base + IITSR);
> > > + raw_spin_unlock(&priv->lock);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int rzg2l_tint_set_edge(struct irq_data *d, unsigned int type)
> {
> > > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > > + unsigned int hwirq = irqd_to_hwirq(d);
> > > + u32 titseln = hwirq - IRQC_TINT_START;
> > > + u32 offset;
> > > + u8 sense;
> > > + u32 reg;
> > > +
> > > + switch (type & IRQ_TYPE_SENSE_MASK) {
> > > + case IRQ_TYPE_EDGE_RISING:
> > > + sense = TITSR_TITSEL_EDGE_RISING;
> > > + break;
> > > +
> > > + case IRQ_TYPE_EDGE_FALLING:
> > > + sense = TITSR_TITSEL_EDGE_FALLING;
> > > + break;
> > > +
> > > + default:
> > > + return -EINVAL;
> > > + }
> > > +
> >
> > > + if (titseln < TITSR0_MAX_INT) {
> > > + offset = TITSR0;
> > > + } else {
> > > + titseln /= TITSEL_WIDTH;
> > > + offset = TITSR1;
> > > + }
> >
> > as TITSR0 (0x24) and TITSR1(0x28) are contiguous address location
> >
> > May be like others, above declare it as
> > u32 offset = TITSR0; ??
> >
> > and here
> > if ((titseln >= TITSR0_MAX_INT) {
> > titseln /= TITSEL_WIDTH;
> > offset += 4;
> > }
> >
> The current implementation is suggested by the maintainer.

OK. I just suggested to optimize the code, since maintainer is
Ok with current implementation, I don't have any issue.

Cheers,
Biju

>
> > > +
> > > + raw_spin_lock(&priv->lock);
> > > + reg = readl_relaxed(priv->base + offset);
> > > + reg &= ~(IRQ_MASK << (titseln * TITSEL_WIDTH));
> > > + reg |= sense << (titseln * TITSEL_WIDTH);
> > > + writel_relaxed(reg, priv->base + offset);
> > > + raw_spin_unlock(&priv->lock);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int rzg2l_irqc_set_type(struct irq_data *d, unsigned int type)
> {
> > > + unsigned int hw_irq = irqd_to_hwirq(d);
> > > + int ret = -EINVAL;
> > > +
> > > + if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT)
> > > + ret = rzg2l_irq_set_type(d, type);
> > > + else if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT)
> > > + ret = rzg2l_tint_set_edge(d, type);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH); }
> > > +
> > > +static struct irq_chip irqc_chip = {
> > > + .name = "rzg2l-irqc",
> > > + .irq_eoi = rzg2l_irqc_eoi,
> > > + .irq_mask = irq_chip_mask_parent,
> > > + .irq_unmask = irq_chip_unmask_parent,
> > > + .irq_disable = rzg2l_irqc_irq_disable,
> > > + .irq_enable = rzg2l_irqc_irq_enable,
> > > + .irq_get_irqchip_state = irq_chip_get_parent_state,
> > > + .irq_set_irqchip_state = irq_chip_set_parent_state,
> > > + .irq_retrigger = irq_chip_retrigger_hierarchy,
> > > + .irq_set_type = rzg2l_irqc_set_type,
> > > + .flags = IRQCHIP_MASK_ON_SUSPEND |
> > > + IRQCHIP_SET_TYPE_MASKED |
> > > + IRQCHIP_SKIP_SET_WAKE, };
> > > +
> > > +static int rzg2l_irqc_alloc(struct irq_domain *domain, unsigned int
> virq,
> > > + unsigned int nr_irqs, void *arg) {
> > > + struct rzg2l_irqc_priv *priv = domain->host_data;
> > > + struct rzg2l_irqc_chip_data *chip_data = NULL;
> > > + struct irq_fwspec spec;
> > > + irq_hw_number_t hwirq;
> > > + int tint = -EINVAL;
> > > + unsigned int type;
> > > + unsigned int i;
> > > + int ret;
> > > +
> > > + ret = irq_domain_translate_twocell(domain, arg, &hwirq, &type);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + /*
> > > + * For TINIT interrupts ie where pinctrl driver is child of
> > > + irqc
> > > domain
> > > + * the hwirq and TINT are encoded in fwspec->param[0].
> > > + * hwirq for TINIT range from 9-40, hwirq is embedded 0-15
> > > + bits and
> > > TINT
> > > + * from 16-31 bits. TINIT from the pinctrl driver needs to be
> > > programmed
> > > + * in IRQC registers to enable a given gpio pin as interrupt.
> > > + */
> > > + if (hwirq > IRQC_IRQ_COUNT) {
> > > + tint = TINT_EXTRACT_GPIOINT(hwirq);
> > > + hwirq = TINT_EXTRACT_HWIRQ(hwirq);
> > > + }
> > > +
> > > + if (hwirq > (IRQC_NUM_IRQ - 1))
> > > + return -EINVAL;
> >
> >
> > > +
> > > + if (tint != -EINVAL && (hwirq < IRQC_TINT_START || hwirq >
> > > (IRQC_NUM_IRQ - 1)))
> > > + return -EINVAL;
> >
> > hwirq > (IRQC_NUM_IRQ - 1) is redundant check, as it is checked above.
> >
> >
> Sure will drop it.
>
> Cheers,
> Prabhakar
>
> > Cheers,
> > Biju
> >
> > > +
> > > + chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
> > > + if (!chip_data)
> > > + return -ENOMEM;
> > > + chip_data->tint = tint;
> > > +
> > > + ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
> &irqc_chip,
> > > + chip_data);
> > > + if (ret) {
> > > + kfree(chip_data);
> > > + return ret;
> > > + }
> > > +
> > > + spec.fwnode = domain->parent->fwnode;
> > > + spec.param_count = priv->map[hwirq].args_count;
> > > + for (i = 0; i < spec.param_count; i++)
> > > + spec.param[i] = priv->map[hwirq].args[i];
> > > +
> > > + ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &spec);
> > > + if (ret)
> > > + kfree(chip_data);
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +static void rzg2l_irqc_domain_free(struct irq_domain *domain,
> > > +unsigned int
> > > virq,
> > > + unsigned int nr_irqs) {
> > > + struct irq_data *d;
> > > +
> > > + d = irq_domain_get_irq_data(domain, virq);
> > > + if (d) {
> > > + struct rzg2l_irqc_chip_data *chip_data = d->chip_data;
> > > +
> > > + kfree(chip_data);
> > > + }
> > > + irq_domain_free_irqs_common(domain, virq, nr_irqs); }
> > > +
> > > +static const struct irq_domain_ops rzg2l_irqc_domain_ops = {
> > > + .alloc = rzg2l_irqc_alloc,
> > > + .free = rzg2l_irqc_domain_free,
> > > + .translate = irq_domain_translate_twocell, };
> > > +
> > > +static int rzg2l_irqc_parse_map(struct rzg2l_irqc_priv *priv,
> > > + struct device_node *np) {
> > > + unsigned int i;
> > > + int ret;
> > > +
> > > + for (i = 0; i < IRQC_NUM_IRQ; i++) {
> > > + ret = of_irq_parse_one(np, i, &priv->map[i]);
> > > + if (ret)
> > > + return ret;
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int rzg2l_irqc_init(struct device_node *node, struct
> > > +device_node
> > > +*parent) {
> > > + struct irq_domain *irq_domain, *parent_domain;
> > > + struct reset_control *resetn;
> > > + struct rzg2l_irqc_priv *priv;
> > > + struct clk *clk;
> > > + struct clk *pclk;
> > > + int ret;
> > > +
> > > + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> > > + if (!priv)
> > > + return -ENOMEM;
> > > +
> > > + priv->base = of_iomap(node, 0);
> > > + if (!priv->base) {
> > > + ret = -ENXIO;
> > > + goto free_priv;
> > > + }
> > > +
> > > + clk = of_clk_get_by_name(node, "clk");
> > > + if (IS_ERR(clk)) {
> > > + ret = IS_ERR(clk);
> > > + goto iounmap_base;
> > > + }
> > > +
> > > + pclk = of_clk_get_by_name(node, "pclk");
> > > + if (IS_ERR(pclk)) {
> > > + ret = IS_ERR(pclk);
> > > + goto iounmap_base;
> > > + }
> > > +
> > > + resetn = of_reset_control_get_exclusive_by_index(node, 0);
> > > + if (IS_ERR(resetn)) {
> > > + ret = IS_ERR(resetn);
> > > + goto iounmap_base;
> > > + }
> > > +
> > > + parent_domain = irq_find_host(parent);
> > > + if (!parent_domain) {
> > > + pr_err("%pOF: cannot find parent domain\n", node);
> > > + ret = -ENODEV;
> > > + goto iounmap_base;
> > > + }
> > > +
> > > + ret = rzg2l_irqc_parse_map(priv, node);
> > > + if (ret) {
> > > + pr_err("%pOF: cannot parse interrupts: %d\n", node, ret);
> > > + goto iounmap_base;
> > > + }
> > > +
> > > + ret = reset_control_deassert(resetn);
> > > + if (ret) {
> > > + pr_err("%pOF: failed to deassert resetn pin, %d\n",
> > > + node,
> > > ret);
> > > + goto iounmap_base;
> > > + }
> > > +
> > > + raw_spin_lock_init(&priv->lock);
> > > +
> > > + ret = clk_prepare_enable(clk);
> > > + if (ret)
> > > + goto assert_reset;
> > > +
> > > + ret = clk_prepare_enable(pclk);
> > > + if (ret)
> > > + goto disable_clk;
> > > +
> > > + irq_domain = irq_domain_add_hierarchy(parent_domain, 0,
> > > IRQC_NUM_IRQ,
> > > + node,
> &rzg2l_irqc_domain_ops,
> > > + priv);
> > > + if (!irq_domain) {
> > > + pr_err("%pOF: cannot initialize irq domain\n", node);
> > > + ret = -ENOMEM;
> > > + goto fail_irq_domain;
> > > + }
> > > +
> > > + return 0;
> > > +
> > > +fail_irq_domain:
> > > + clk_disable_unprepare(pclk);
> > > +disable_clk:
> > > + clk_disable_unprepare(clk);
> > > +assert_reset:
> > > + reset_control_assert(resetn);
> > > +iounmap_base:
> > > + iounmap(priv->base);
> > > +free_priv:
> > > + kfree(priv);
> > > + return ret;
> > > +}
> > > +
> > > +IRQCHIP_PLATFORM_DRIVER_BEGIN(rzg2l_irqc)
> > > +IRQCHIP_MATCH("renesas,rzg2l-irqc", rzg2l_irqc_init)
> > > +IRQCHIP_PLATFORM_DRIVER_END(rzg2l_irqc)
> > > +MODULE_AUTHOR("Lad Prabhakar
> > > +<prabhakar.mahadev-lad.rj@bp.renesas.com>");
> > > +MODULE_DESCRIPTION("Renesas RZ/G2L IRQC Driver");
> > > +MODULE_LICENSE("GPL");
> > > --
> > > 2.25.1
> >
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