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Date: Wed, 23 Nov 2022 10:04:51 +0100
From: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
To: Marc Zyngier <maz@...nel.org>
Cc: tglx@...utronix.de, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
youlin.pei@...iatek.com, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v1 3/4] irqchip: irq-mtk-cirq: Move register offsets to
const array
Il 22/11/22 14:03, Marc Zyngier ha scritto:
> On Fri, 18 Nov 2022 10:06:38 +0000,
> AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com> wrote:
>>
>> In preparation to add support for new SoCs having different register
>> offsets, add an enumeration that documents registers and move the
>> register offsets definitions to a u32 array.
>>
>> Of course, every usage of the definitions was changed to use the
>> newly introduced register offsets array.
>>
>> This change brings no functional changes.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> ---
>> drivers/irqchip/irq-mtk-cirq.c | 62 ++++++++++++++++++++++++----------
>> 1 file changed, 44 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/irqchip/irq-mtk-cirq.c b/drivers/irqchip/irq-mtk-cirq.c
>> index 9bca0918078e..affbc0f48550 100644
>> --- a/drivers/irqchip/irq-mtk-cirq.c
>> +++ b/drivers/irqchip/irq-mtk-cirq.c
>> @@ -15,14 +15,30 @@
>> #include <linux/slab.h>
>> #include <linux/syscore_ops.h>
>>
>> -#define CIRQ_ACK 0x40
>> -#define CIRQ_MASK_SET 0xc0
>> -#define CIRQ_MASK_CLR 0x100
>> -#define CIRQ_SENS_SET 0x180
>> -#define CIRQ_SENS_CLR 0x1c0
>> -#define CIRQ_POL_SET 0x240
>> -#define CIRQ_POL_CLR 0x280
>> -#define CIRQ_CONTROL 0x300
>> +enum mtk_cirq_reg_index {
>> + CIRQ_STA = 0,
>
> Enums starting from 0 are the default.
>
>> + CIRQ_ACK,
>> + CIRQ_MASK_SET,
>> + CIRQ_MASK_CLR,
>> + CIRQ_SENS_SET,
>> + CIRQ_SENS_CLR,
>> + CIRQ_POL_SET,
>> + CIRQ_POL_CLR,
>> + CIRQ_CONTROL,
>> + CIRQ_MAX
>
> What's the use of this last constant?
>
None, was commodity for loops - will remove, thanks.
>> +};
>> +
>> +static const u32 mtk_cirq_regs_v1[] = {
>> + [CIRQ_STA] = 0x0,
>> + [CIRQ_ACK] = 0x40,
>> + [CIRQ_MASK_SET] = 0xc0,
>> + [CIRQ_MASK_CLR] = 0x100,
>> + [CIRQ_SENS_SET] = 0x180,
>> + [CIRQ_SENS_CLR] = 0x1c0,
>> + [CIRQ_POL_SET] = 0x240,
>> + [CIRQ_POL_CLR] = 0x280,
>> + [CIRQ_CONTROL] = 0x300,
>> +};
>>
>> #define CIRQ_EN 0x1
>> #define CIRQ_EDGE 0x2
>> @@ -32,18 +48,20 @@ struct mtk_cirq_chip_data {
>> void __iomem *base;
>> unsigned int ext_irq_start;
>> unsigned int ext_irq_end;
>> + const u32 *regs;
>
> This is an array of *offsets*, not registers. Please name it accordingly.
>
Will do
>> struct irq_domain *domain;
>> };
>>
>> static struct mtk_cirq_chip_data *cirq_data;
>>
>> -static void mtk_cirq_write_mask(struct irq_data *data, unsigned int offset)
>> +static void mtk_cirq_write_mask(struct irq_data *data, enum mtk_cirq_reg_index idx)
>> {
>> struct mtk_cirq_chip_data *chip_data = data->chip_data;
>> unsigned int cirq_num = data->hwirq;
>> u32 mask = 1 << (cirq_num % 32);
>> + u32 reg = chip_data->regs[idx] + (cirq_num / 32) * 4;
>
> Please provide an accessor that takes chip_data and an index, and
> returns an address.
>
Ack.
>>
>> - writel_relaxed(mask, chip_data->base + offset + (cirq_num / 32) * 4);
>> + writel_relaxed(mask, chip_data->base + reg);
>> }
>>
>> static void mtk_cirq_mask(struct irq_data *data)
>> @@ -160,7 +178,7 @@ static const struct irq_domain_ops cirq_domain_ops = {
>> #ifdef CONFIG_PM_SLEEP
>> static int mtk_cirq_suspend(void)
>> {
>> - u32 value, mask;
>> + u32 value, mask, reg;
>> unsigned int irq, hwirq_num;
>> bool pending, masked;
>> int i, pendret, maskret;
>> @@ -200,31 +218,34 @@ static int mtk_cirq_suspend(void)
>> continue;
>> }
>>
>> + reg = cirq_data->regs[CIRQ_ACK] + (i / 32) * 4;
>> mask = 1 << (i % 32);
>> - writel_relaxed(mask, cirq_data->base + CIRQ_ACK + (i / 32) * 4);
>> + writel_relaxed(mask, cirq_data->base + reg);
>> }
>>
>> /* set edge_only mode, record edge-triggerd interrupts */
>> /* enable cirq */
>> - value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
>> + reg = cirq_data->regs[CIRQ_CONTROL];
>> + value = readl_relaxed(cirq_data->base + reg);
>> value |= (CIRQ_EDGE | CIRQ_EN);
>> - writel_relaxed(value, cirq_data->base + CIRQ_CONTROL);
>> + writel_relaxed(value, cirq_data->base + reg);
>>
>> return 0;
>> }
>>
>> static void mtk_cirq_resume(void)
>> {
>> + u32 reg = cirq_data->regs[CIRQ_CONTROL];
>> u32 value;
>>
>> /* flush recorded interrupts, will send signals to parent controller */
>> - value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
>> - writel_relaxed(value | CIRQ_FLUSH, cirq_data->base + CIRQ_CONTROL);
>> + value = readl_relaxed(cirq_data->base + reg);
>> + writel_relaxed(value | CIRQ_FLUSH, cirq_data->base + reg);
>>
>> /* disable cirq */
>> - value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
>> + value = readl_relaxed(cirq_data->base + reg);
>> value &= ~(CIRQ_EDGE | CIRQ_EN);
>> - writel_relaxed(value, cirq_data->base + CIRQ_CONTROL);
>> + writel_relaxed(value, cirq_data->base + reg);
>> }
>>
>> static struct syscore_ops mtk_cirq_syscore_ops = {
>> @@ -240,6 +261,9 @@ static void mtk_cirq_syscore_init(void)
>> static inline void mtk_cirq_syscore_init(void) {}
>> #endif
>>
>> +static const struct of_device_id mtk_cirq_of_match[] = {
>> + { .compatible = "mediatek,
>> +
>
> I can tell by this hunk the quality of testing this patch has
> received.
>
Actually, the testing was performed on multiple SoCs.
As for why this is there, check below...
>> static int __init mtk_cirq_of_init(struct device_node *node,
>> struct device_node *parent)
>> {
>> @@ -274,6 +298,8 @@ static int __init mtk_cirq_of_init(struct device_node *node,
>> if (ret)
>> goto out_unmap;
>>
>> + cirq_data->regs = mtk_cirq_regs_v1;
>
> Why isn't this obtained from the matching array?
>
.... I'm truly sorry for what happened, I've just checked - the right patchset
was in a different folder and I've somehow sent the wrong one.
Sorry again - will send a v2 ASAP.
Best regards,
Angelo
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