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a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1754380253; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=+So4wv8Zly3BtM63OQvZFyoVi+SRY/LO7UXsrqv6fcM=; b=kDsAWd4dy48cmoYwpT8I4eiUq6h6MDpAhKchcYikjsGh9zQmB8lOuDP9cO66j1qoC3gMqQ MnNkyv4iYe2pTqBA== To: Ryan Chen , ryan_chen , Eddie James , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Joel Stanley , Andrew Jeffery , linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 2/2] irqchip/aspeed-scu-ic: Add support for AST2700 SCU interrupt controllers In-Reply-To: <20250804053445.1482749-3-ryan_chen@aspeedtech.com> References: <20250804053445.1482749-1-ryan_chen@aspeedtech.com> <20250804053445.1482749-3-ryan_chen@aspeedtech.com> Date: Tue, 05 Aug 2025 09:50:52 +0200 Message-ID: <874iumgqar.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250805_005055_645092_B8F29FF1 X-CRM114-Status: GOOD ( 27.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Aug 04 2025 at 13:34, Ryan Chen wrote: > +#define ASPEED_AST2700_SCU_IC0_EN_REG 0x1d0 > +#define ASPEED_AST2700_SCU_IC0_STS_REG 0x1d4 > +#define ASPEED_AST2700_SCU_IC0_SHIFT 0 > +#define ASPEED_AST2700_SCU_IC0_ENABLE \ > + GENMASK(3, ASPEED_AST2700_SCU_IC0_SHIFT) Let it stick out, you have 100 characters > struct aspeed_scu_ic { > unsigned long irq_enable; > unsigned long irq_shift; > unsigned int num_irqs; > unsigned int reg; > + unsigned int en_reg; > + unsigned int sts_reg; > + bool split_ier_isr; Please reformat this struct declaration according to: https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#struct-declarations-and-initializers > struct regmap *scu; > struct irq_domain *irq_domain; > }; > @@ -52,33 +83,51 @@ static void aspeed_scu_ic_irq_handler(struct irq_desc *desc) > unsigned long status; > struct aspeed_scu_ic *scu_ic = irq_desc_get_handler_data(desc); > struct irq_chip *chip = irq_desc_get_chip(desc); > - unsigned int mask = scu_ic->irq_enable << ASPEED_SCU_IC_STATUS_SHIFT; > + unsigned int mask; https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#variable-declarations > chained_irq_enter(chip, desc); > > - /* > - * The SCU IC has just one register to control its operation and read > - * status. The interrupt enable bits occupy the lower 16 bits of the > - * register, while the interrupt status bits occupy the upper 16 bits. > - * The status bit for a given interrupt is always 16 bits shifted from > - * the enable bit for the same interrupt. > - * Therefore, perform the IRQ operations in the enable bit space by > - * shifting the status down to get the mapping and then back up to > - * clear the bit. > - */ > - regmap_read(scu_ic->scu, scu_ic->reg, &sts); > - enabled = sts & scu_ic->irq_enable; > - status = (sts >> ASPEED_SCU_IC_STATUS_SHIFT) & enabled; > - > - bit = scu_ic->irq_shift; > - max = scu_ic->num_irqs + bit; > - > - for_each_set_bit_from(bit, &status, max) { > - generic_handle_domain_irq(scu_ic->irq_domain, > - bit - scu_ic->irq_shift); > - > - regmap_write_bits(scu_ic->scu, scu_ic->reg, mask, > - BIT(bit + ASPEED_SCU_IC_STATUS_SHIFT)); > + if (scu_ic->split_ier_isr) { > + mask = scu_ic->irq_enable; > + regmap_read(scu_ic->scu, scu_ic->en_reg, &sts); > + enabled = sts & scu_ic->irq_enable; > + regmap_read(scu_ic->scu, scu_ic->sts_reg, &sts); > + status = sts & enabled; > + > + bit = scu_ic->irq_shift; > + max = scu_ic->num_irqs + bit; > + > + for_each_set_bit_from(bit, &status, max) { > + generic_handle_domain_irq(scu_ic->irq_domain, bit - scu_ic->irq_shift); > + > + regmap_write_bits(scu_ic->scu, scu_ic->sts_reg, mask, BIT(bit)); > + } > + } else { > + mask = scu_ic->irq_enable << ASPEED_SCU_IC_STATUS_SHIFT; > + /* > + * The SCU IC has just one register to control its operation and read > + * status. The interrupt enable bits occupy the lower 16 bits of the > + * register, while the interrupt status bits occupy the upper 16 bits. > + * The status bit for a given interrupt is always 16 bits shifted from > + * the enable bit for the same interrupt. > + * Therefore, perform the IRQ operations in the enable bit space by > + * shifting the status down to get the mapping and then back up to > + * clear the bit. > + */ > + regmap_read(scu_ic->scu, scu_ic->reg, &sts); > + enabled = sts & scu_ic->irq_enable; > + status = (sts >> ASPEED_SCU_IC_STATUS_SHIFT) & enabled; > + > + bit = scu_ic->irq_shift; > + max = scu_ic->num_irqs + bit; > + > + for_each_set_bit_from(bit, &status, max) { > + generic_handle_domain_irq(scu_ic->irq_domain, > + bit - scu_ic->irq_shift); > + > + regmap_write_bits(scu_ic->scu, scu_ic->reg, mask, > + BIT(bit + ASPEED_SCU_IC_STATUS_SHIFT)); > + } This is horrible, really. Either rework the code so that both chips can share it with minimal conditionals or provide seperate handlers. It's not rocket science. > chained_irq_exit(chip, desc); > @@ -87,30 +136,42 @@ static void aspeed_scu_ic_irq_handler(struct irq_desc *desc) > static void aspeed_scu_ic_irq_mask(struct irq_data *data) > static void aspeed_scu_ic_irq_unmask(struct irq_data *data) > { > struct aspeed_scu_ic *scu_ic = irq_data_get_irq_chip_data(data); > unsigned int bit = BIT(data->hwirq + scu_ic->irq_shift); > - unsigned int mask = bit | > - (scu_ic->irq_enable << ASPEED_SCU_IC_STATUS_SHIFT); > - > - /* > - * Status bits are cleared by writing 1. In order to prevent the unmask > - * operation from clearing the status bits, they should be under the > - * mask and written with 0. > - */ > - regmap_update_bits(scu_ic->scu, scu_ic->reg, mask, bit); > + unsigned int mask; > + > + if (scu_ic->split_ier_isr) { > + mask = bit; > + regmap_update_bits(scu_ic->scu, scu_ic->en_reg, mask, bit); > + } else { > + mask = bit | (scu_ic->irq_enable << ASPEED_SCU_IC_STATUS_SHIFT); > + > + /* > + * Status bits are cleared by writing 1. In order to prevent the unmask > + * operation from clearing the status bits, they should be under the > + * mask and written with 0. > + */ > + regmap_update_bits(scu_ic->scu, scu_ic->reg, mask, bit); > + } This also wants to be consolidated or seperated. > } > > +static int __init aspeed_ast2700_scu_ic0_of_init(struct device_node *node, > + struct device_node *parent) > +{ > + struct aspeed_scu_ic *scu_ic = kzalloc(sizeof(*scu_ic), GFP_KERNEL); > + > + if (!scu_ic) > + return -ENOMEM; > + > + scu_ic->irq_enable = ASPEED_AST2700_SCU_IC0_ENABLE; > + scu_ic->irq_shift = ASPEED_AST2700_SCU_IC0_SHIFT; > + scu_ic->num_irqs = ASPEED_AST2700_SCU_IC0_NUM_IRQS; > + scu_ic->split_ier_isr = true; > + scu_ic->en_reg = ASPEED_AST2700_SCU_IC0_EN_REG; > + scu_ic->sts_reg = ASPEED_AST2700_SCU_IC0_STS_REG; > + > + return aspeed_scu_ic_of_init_common(scu_ic, node); > +} > + > +static int __init aspeed_ast2700_scu_ic1_of_init(struct device_node *node, > + struct device_node *parent) > +{ > + struct aspeed_scu_ic *scu_ic = kzalloc(sizeof(*scu_ic), GFP_KERNEL); > + > + if (!scu_ic) > + return -ENOMEM; > + > + scu_ic->irq_enable = ASPEED_AST2700_SCU_IC1_ENABLE; > + scu_ic->irq_shift = ASPEED_AST2700_SCU_IC1_SHIFT; > + scu_ic->num_irqs = ASPEED_AST2700_SCU_IC1_NUM_IRQS; > + scu_ic->split_ier_isr = true; > + scu_ic->en_reg = ASPEED_AST2700_SCU_IC1_EN_REG; > + scu_ic->sts_reg = ASPEED_AST2700_SCU_IC1_STS_REG; > + > + return aspeed_scu_ic_of_init_common(scu_ic, node); > +} > + > +static int __init aspeed_ast2700_scu_ic2_of_init(struct device_node *node, > + struct device_node *parent) > +{ > + struct aspeed_scu_ic *scu_ic = kzalloc(sizeof(*scu_ic), GFP_KERNEL); > + > + if (!scu_ic) > + return -ENOMEM; > + > + scu_ic->irq_enable = ASPEED_AST2700_SCU_IC2_ENABLE; > + scu_ic->irq_shift = ASPEED_AST2700_SCU_IC2_SHIFT; > + scu_ic->num_irqs = ASPEED_AST2700_SCU_IC2_NUM_IRQS; > + scu_ic->split_ier_isr = true; > + scu_ic->en_reg = ASPEED_AST2700_SCU_IC2_EN_REG; > + scu_ic->sts_reg = ASPEED_AST2700_SCU_IC2_STS_REG; > + > + return aspeed_scu_ic_of_init_common(scu_ic, node); > +} > + > +static int __init aspeed_ast2700_scu_ic3_of_init(struct device_node *node, > + struct device_node *parent) > +{ > + struct aspeed_scu_ic *scu_ic = kzalloc(sizeof(*scu_ic), GFP_KERNEL); > + > + if (!scu_ic) > + return -ENOMEM; > + > + scu_ic->irq_enable = ASPEED_AST2700_SCU_IC3_ENABLE; > + scu_ic->irq_shift = ASPEED_AST2700_SCU_IC3_SHIFT; > + scu_ic->num_irqs = ASPEED_AST2700_SCU_IC3_NUM_IRQS; > + scu_ic->split_ier_isr = true; > + scu_ic->en_reg = ASPEED_AST2700_SCU_IC3_EN_REG; > + scu_ic->sts_reg = ASPEED_AST2700_SCU_IC3_STS_REG; > + > + return aspeed_scu_ic_of_init_common(scu_ic, node); > +} You seriously have no better idea than this copy & pasta orgy? static struct scu_variant variants = { SCU("aspeed,ast2400-scu-ic", ......, whatever...), ... SCU("aspeed,ast2700-scu-ic0", 0x1D0, 0x1D4, 0, GENMASK(3, 0), 4, whatever...), ... SCU("aspeed,ast2700-scu-ic3", 0x10C, 0x108, 0, GENMASK(1, 0), 2, ......), } __initdata; static struct scu_variant *find_variant(struct device_node *node) { for (int i = 0; i < ARRAY_SIZE(variant); i++) { if (!strcmp(variant[i].name, node->name)) return &variant[i]; } return NULL; } static int __init ast_scu_of_init(struct device_node *node, struct device_node *parent) { struct variant *v = find_variant(node); if (!v) ... scu_ic = kzalloc(...); *scu_ic = v->scu; ... You get the idea. This rework needs to come first and then you can add your new 2700 muck on top. Thanks, tglx