diff mbox series

[PATCHv3,5/6] irqchip/irq-pruss-intc: Add support for ICSSG INTC on K3 SoCs

Message ID 1593699479-1445-6-git-send-email-grzegorz.jaszczyk@linaro.org (mailing list archive)
State New, archived
Headers show
Series Add TI PRUSS Local Interrupt Controller IRQChip driver | expand

Commit Message

Grzegorz Jaszczyk July 2, 2020, 2:17 p.m. UTC 
From: Suman Anna <s-anna@ti.com>

The K3 AM65x and J721E SoCs have the next generation of the PRU-ICSS IP,
commonly called ICSSG. The PRUSS INTC present within the ICSSG supports
more System Events (160 vs 64), more Interrupt Channels and Host Interrupts
(20 vs 10) compared to the previous generation PRUSS INTC instances. The
first 2 and the last 10 of these host interrupt lines are used by the
PRU and other auxiliary cores and sub-modules within the ICSSG, with 8
host interrupts connected to MPU. The host interrupts 5, 6, 7 are also
connected to the other ICSSG instances within the SoC and can be
partitioned as per system integration through the board dts files.

Enhance the PRUSS INTC driver to add support for this ICSSG INTC
instance. This support is added using specific compatible and match
data and updating the code to use this data instead of the current
hard-coded macros. The INTC config structure is updated to use the
higher events and channels on all SoCs, while limiting the actual
processing to only the relevant number of events/channels/interrupts.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
---
v2->v3:
- Change patch order: use it directly after "irqchip/irq-pruss-intc:
  Implement irq_{get,set}_irqchip_state ops" and before new
  "irqchip/irq-pruss-intc: Add event mapping support" in order to reduce
  diff.

v1->v2:
- https://patchwork.kernel.org/patch/11069773/
---
 drivers/irqchip/Kconfig          |   2 +-
 drivers/irqchip/irq-pruss-intc.c | 101 ++++++++++++++++++++++++++++-----------
 2 files changed, 74 insertions(+), 29 deletions(-)

Comments

Marc Zyngier July 2, 2020, 5:59 p.m. UTC | #1 
On 2020-07-02 15:17, Grzegorz Jaszczyk wrote:
> From: Suman Anna <s-anna@ti.com>
> 
> The K3 AM65x and J721E SoCs have the next generation of the PRU-ICSS 
> IP,
> commonly called ICSSG. The PRUSS INTC present within the ICSSG supports
> more System Events (160 vs 64), more Interrupt Channels and Host 
> Interrupts
> (20 vs 10) compared to the previous generation PRUSS INTC instances. 
> The
> first 2 and the last 10 of these host interrupt lines are used by the
> PRU and other auxiliary cores and sub-modules within the ICSSG, with 8
> host interrupts connected to MPU. The host interrupts 5, 6, 7 are also
> connected to the other ICSSG instances within the SoC and can be
> partitioned as per system integration through the board dts files.
> 
> Enhance the PRUSS INTC driver to add support for this ICSSG INTC
> instance. This support is added using specific compatible and match
> data and updating the code to use this data instead of the current
> hard-coded macros. The INTC config structure is updated to use the
> higher events and channels on all SoCs, while limiting the actual
> processing to only the relevant number of events/channels/interrupts.
> 
> Signed-off-by: Suman Anna <s-anna@ti.com>
> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
> ---
> v2->v3:
> - Change patch order: use it directly after "irqchip/irq-pruss-intc:
>   Implement irq_{get,set}_irqchip_state ops" and before new
>   "irqchip/irq-pruss-intc: Add event mapping support" in order to 
> reduce
>   diff.

The diff would be even smaller if you introduced a variable number of
inputs the first place, i.e. in patch #2. Most if this patch just
retrofits it. Please squash these changes into that initial patch,
and only add the platform stuff here.

Thanks,

         M.
Grzegorz Jaszczyk July 3, 2020, 5:05 p.m. UTC | #2 
On Thu, 2 Jul 2020 at 19:59, Marc Zyngier <maz@kernel.org> wrote:
>
> On 2020-07-02 15:17, Grzegorz Jaszczyk wrote:
> > From: Suman Anna <s-anna@ti.com>
> >
> > The K3 AM65x and J721E SoCs have the next generation of the PRU-ICSS
> > IP,
> > commonly called ICSSG. The PRUSS INTC present within the ICSSG supports
> > more System Events (160 vs 64), more Interrupt Channels and Host
> > Interrupts
> > (20 vs 10) compared to the previous generation PRUSS INTC instances.
> > The
> > first 2 and the last 10 of these host interrupt lines are used by the
> > PRU and other auxiliary cores and sub-modules within the ICSSG, with 8
> > host interrupts connected to MPU. The host interrupts 5, 6, 7 are also
> > connected to the other ICSSG instances within the SoC and can be
> > partitioned as per system integration through the board dts files.
> >
> > Enhance the PRUSS INTC driver to add support for this ICSSG INTC
> > instance. This support is added using specific compatible and match
> > data and updating the code to use this data instead of the current
> > hard-coded macros. The INTC config structure is updated to use the
> > higher events and channels on all SoCs, while limiting the actual
> > processing to only the relevant number of events/channels/interrupts.
> >
> > Signed-off-by: Suman Anna <s-anna@ti.com>
> > Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
> > ---
> > v2->v3:
> > - Change patch order: use it directly after "irqchip/irq-pruss-intc:
> >   Implement irq_{get,set}_irqchip_state ops" and before new
> >   "irqchip/irq-pruss-intc: Add event mapping support" in order to
> > reduce
> >   diff.
>
> The diff would be even smaller if you introduced a variable number of
> inputs the first place, i.e. in patch #2. Most if this patch just
> retrofits it. Please squash these changes into that initial patch,
> and only add the platform stuff here.

Sure I will do that.

Thank you,
Grzegorz
Suman Anna July 10, 2020, 9:13 p.m. UTC | #3 
Hi Marc,

On 7/3/20 12:05 PM, Grzegorz Jaszczyk wrote:
> On Thu, 2 Jul 2020 at 19:59, Marc Zyngier <maz@kernel.org> wrote:
>>
>> On 2020-07-02 15:17, Grzegorz Jaszczyk wrote:
>>> From: Suman Anna <s-anna@ti.com>
>>>
>>> The K3 AM65x and J721E SoCs have the next generation of the PRU-ICSS
>>> IP,
>>> commonly called ICSSG. The PRUSS INTC present within the ICSSG supports
>>> more System Events (160 vs 64), more Interrupt Channels and Host
>>> Interrupts
>>> (20 vs 10) compared to the previous generation PRUSS INTC instances.
>>> The
>>> first 2 and the last 10 of these host interrupt lines are used by the
>>> PRU and other auxiliary cores and sub-modules within the ICSSG, with 8
>>> host interrupts connected to MPU. The host interrupts 5, 6, 7 are also
>>> connected to the other ICSSG instances within the SoC and can be
>>> partitioned as per system integration through the board dts files.
>>>
>>> Enhance the PRUSS INTC driver to add support for this ICSSG INTC
>>> instance. This support is added using specific compatible and match
>>> data and updating the code to use this data instead of the current
>>> hard-coded macros. The INTC config structure is updated to use the
>>> higher events and channels on all SoCs, while limiting the actual
>>> processing to only the relevant number of events/channels/interrupts.
>>>
>>> Signed-off-by: Suman Anna <s-anna@ti.com>
>>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
>>> ---
>>> v2->v3:
>>> - Change patch order: use it directly after "irqchip/irq-pruss-intc:
>>>    Implement irq_{get,set}_irqchip_state ops" and before new
>>>    "irqchip/irq-pruss-intc: Add event mapping support" in order to
>>> reduce
>>>    diff.
>>
>> The diff would be even smaller if you introduced a variable number of
>> inputs the first place, i.e. in patch #2. Most if this patch just
>> retrofits it. Please squash these changes into that initial patch,
>> and only add the platform stuff here.

Yeah, all the variables were introduced in this patch based on patch 
history. Until this new IP came, we haven't had a need to use variables 
in the original driver code. That's also the reason for this being a 
separate patch rather than squashed into the original patch.

regards
Suman

>
> Sure I will do that.
> 
> Thank you,
> Grzegorz
>
diff mbox series

Patch

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 733d7ec..9abee84 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -495,7 +495,7 @@  config TI_SCI_INTA_IRQCHIP
 
 config TI_PRUSS_INTC
 	tristate "TI PRU-ICSS Interrupt Controller"
-	depends on ARCH_DAVINCI || SOC_AM33XX || SOC_AM43XX || SOC_DRA7XX || ARCH_KEYSTONE
+	depends on ARCH_DAVINCI || SOC_AM33XX || SOC_AM43XX || SOC_DRA7XX || ARCH_KEYSTONE || ARCH_K3
 	select IRQ_DOMAIN
 	help
 	   This enables support for the PRU-ICSS Local Interrupt Controller
diff --git a/drivers/irqchip/irq-pruss-intc.c b/drivers/irqchip/irq-pruss-intc.c
index 19b3d38..362aa01 100644
--- a/drivers/irqchip/irq-pruss-intc.c
+++ b/drivers/irqchip/irq-pruss-intc.c
@@ -7,6 +7,7 @@ 
  *	Suman Anna <s-anna@ti.com>
  */
 
+#include <linux/bitmap.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqchip/chained_irq.h>
@@ -25,9 +26,6 @@ 
 /* minimum starting host interrupt number for MPU */
 #define MIN_PRU_HOST_INT	2
 
-/* maximum number of system events */
-#define MAX_PRU_SYS_EVENTS	64
-
 /* PRU_ICSS_INTC registers */
 #define PRU_INTC_REVID		0x0000
 #define PRU_INTC_CR		0x0004
@@ -41,30 +39,42 @@ 
 #define PRU_INTC_HIDISR		0x0038
 #define PRU_INTC_GPIR		0x0080
 #define PRU_INTC_SRSR(x)	(0x0200 + (x) * 4)
-#define PRU_INTC_SECR0		0x0280
-#define PRU_INTC_SECR1		0x0284
-#define PRU_INTC_ESR0		0x0300
-#define PRU_INTC_ESR1		0x0304
-#define PRU_INTC_ECR0		0x0380
-#define PRU_INTC_ECR1		0x0384
+#define PRU_INTC_SECR(x)	(0x0280 + (x) * 4)
+#define PRU_INTC_ESR(x)		(0x0300 + (x) * 4)
+#define PRU_INTC_ECR(x)		(0x0380 + (x) * 4)
 #define PRU_INTC_CMR(x)		(0x0400 + (x) * 4)
 #define PRU_INTC_HMR(x)		(0x0800 + (x) * 4)
 #define PRU_INTC_HIPIR(x)	(0x0900 + (x) * 4)
-#define PRU_INTC_SIPR0		0x0d00
-#define PRU_INTC_SIPR1		0x0d04
-#define PRU_INTC_SITR0		0x0d80
-#define PRU_INTC_SITR1		0x0d84
+#define PRU_INTC_SIPR(x)	(0x0d00 + (x) * 4)
+#define PRU_INTC_SITR(x)	(0x0d80 + (x) * 4)
 #define PRU_INTC_HINLR(x)	(0x1100 + (x) * 4)
 #define PRU_INTC_HIER		0x1500
 
+/* CMR register bit-field macros */
+#define CMR_EVT_PER_REG		4
+
+/* HMR register bit-field macros */
+#define HMR_CH_PER_REG		4
+
 /* HIPIR register bit-fields */
 #define INTC_HIPIR_NONE_HINT	0x80000000
 
 /**
+ * struct pruss_intc_match_data - match data to handle SoC variations
+ * @num_system_events: number of input system events handled by the PRUSS INTC
+ * @num_host_intrs: number of host interrupts supported by the PRUSS INTC
+ */
+struct pruss_intc_match_data {
+	u8 num_system_events;
+	u8 num_host_intrs;
+};
+
+/**
  * struct pruss_intc - PRUSS interrupt controller structure
  * @irqs: kernel irq numbers corresponding to PRUSS host interrupts
  * @base: base virtual address of INTC register space
  * @domain: irq domain for this interrupt controller
+ * @soc_config: cached PRUSS INTC IP configuration data
  * @shared_intr: bit-map denoting if the MPU host interrupt is shared
  * @invalid_intr: bit-map denoting if host interrupt is not connected to MPU
  */
@@ -72,6 +82,7 @@  struct pruss_intc {
 	unsigned int irqs[MAX_NUM_HOST_IRQS];
 	void __iomem *base;
 	struct irq_domain *domain;
+	const struct pruss_intc_match_data *soc_config;
 	u16 shared_intr;
 	u16 invalid_intr;
 };
@@ -89,22 +100,30 @@  static inline void pruss_intc_write_reg(struct pruss_intc *intc,
 
 static void pruss_intc_init(struct pruss_intc *intc)
 {
+	const struct pruss_intc_match_data *soc_config = intc->soc_config;
 	int i;
+	int num_chnl_map_regs = DIV_ROUND_UP(soc_config->num_system_events,
+					     CMR_EVT_PER_REG);
+	int num_host_intr_regs = DIV_ROUND_UP(soc_config->num_host_intrs,
+					      HMR_CH_PER_REG);
+	int num_event_type_regs =
+			DIV_ROUND_UP(soc_config->num_system_events, 32);
 
-	/* configure polarity to active high for all system interrupts */
-	pruss_intc_write_reg(intc, PRU_INTC_SIPR0, 0xffffffff);
-	pruss_intc_write_reg(intc, PRU_INTC_SIPR1, 0xffffffff);
-
-	/* configure type to pulse interrupt for all system interrupts */
-	pruss_intc_write_reg(intc, PRU_INTC_SITR0, 0);
-	pruss_intc_write_reg(intc, PRU_INTC_SITR1, 0);
+	/*
+	 * configure polarity (SIPR register) to active high and
+	 * type (SITR register) to pulse interrupt for all system events
+	 */
+	for (i = 0; i < num_event_type_regs; i++) {
+		pruss_intc_write_reg(intc, PRU_INTC_SIPR(i), 0xffffffff);
+		pruss_intc_write_reg(intc, PRU_INTC_SITR(i), 0);
+	}
 
-	/* clear all 16 interrupt channel map registers */
-	for (i = 0; i < 16; i++)
+	/* clear all interrupt channel map registers, 4 events per register */
+	for (i = 0; i < num_chnl_map_regs; i++)
 		pruss_intc_write_reg(intc, PRU_INTC_CMR(i), 0);
 
-	/* clear all 3 host interrupt map registers */
-	for (i = 0; i < 3; i++)
+	/* clear all host interrupt map registers, 4 channels per register */
+	for (i = 0; i < num_host_intr_regs; i++)
 		pruss_intc_write_reg(intc, PRU_INTC_HMR(i), 0);
 }
 
@@ -266,11 +285,20 @@  static int pruss_intc_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct pruss_intc *intc;
 	int i, irq, count;
+	const struct pruss_intc_match_data *data;
 	u8 temp_intr[MAX_NUM_HOST_IRQS] = { 0 };
+	u8 max_system_events;
+
+	data = of_device_get_match_data(dev);
+	if (!data)
+		return -ENODEV;
+
+	max_system_events = data->num_system_events;
 
 	intc = devm_kzalloc(dev, sizeof(*intc), GFP_KERNEL);
 	if (!intc)
 		return -ENOMEM;
+	intc->soc_config = data;
 	platform_set_drvdata(pdev, intc);
 
 	intc->base = devm_platform_ioremap_resource(pdev, 0);
@@ -327,8 +355,7 @@  static int pruss_intc_probe(struct platform_device *pdev)
 
 	pruss_intc_init(intc);
 
-	/* always 64 events */
-	intc->domain = irq_domain_add_linear(dev->of_node, MAX_PRU_SYS_EVENTS,
+	intc->domain = irq_domain_add_linear(dev->of_node, max_system_events,
 					     &pruss_intc_irq_domain_ops, intc);
 	if (!intc->domain)
 		return -ENOMEM;
@@ -369,6 +396,7 @@  static int pruss_intc_probe(struct platform_device *pdev)
 static int pruss_intc_remove(struct platform_device *pdev)
 {
 	struct pruss_intc *intc = platform_get_drvdata(pdev);
+	u8 max_system_events = intc->soc_config->num_system_events;
 	unsigned int hwirq;
 	int i;
 
@@ -378,7 +406,7 @@  static int pruss_intc_remove(struct platform_device *pdev)
 							 NULL);
 	}
 
-	for (hwirq = 0; hwirq < MAX_PRU_SYS_EVENTS; hwirq++)
+	for (hwirq = 0; hwirq < max_system_events; hwirq++)
 		irq_dispose_mapping(irq_find_mapping(intc->domain, hwirq));
 
 	irq_domain_remove(intc->domain);
@@ -386,8 +414,25 @@  static int pruss_intc_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct pruss_intc_match_data pruss_intc_data = {
+	.num_system_events = 64,
+	.num_host_intrs = 10,
+};
+
+static const struct pruss_intc_match_data icssg_intc_data = {
+	.num_system_events = 160,
+	.num_host_intrs = 20,
+};
+
 static const struct of_device_id pruss_intc_of_match[] = {
-	{ .compatible = "ti,pruss-intc", },
+	{
+		.compatible = "ti,pruss-intc",
+		.data = &pruss_intc_data,
+	},
+	{
+		.compatible = "ti,icssg-intc",
+		.data = &icssg_intc_data,
+	},
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, pruss_intc_of_match);