Message-ID: <fed95ae1-86a5-af75-c017-08b19e8e743b@ti.com>
Date:   Mon, 12 Aug 2019 14:39:07 -0500
From:   Suman Anna <s-anna@...com>
To:     David Lechner <david@...hnology.com>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
CC:     Rob Herring <robh+dt@...nel.org>, Tony Lindgren <tony@...mide.com>,
        "Andrew F. Davis" <afd@...com>, Roger Quadros <rogerq@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Sekhar Nori <nsekhar@...com>,
        Murali Karicheri <m-karicheri2@...com>,
        <devicetree@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/6] irqchip/irq-pruss-intc: Add helper functions to
 configure internal mapping

Hi David,

On 8/8/19 12:09 PM, David Lechner wrote:
> On 8/2/19 4:26 PM, Suman Anna wrote:
>> Point is different applications might use mapping differently as per
>> their firmware and driver/application design and their split across one
>> or more PRUs (design by contract). And we need to set this up at runtime
>> when the application driver is getting run. We will have either the Soft
>> UART or the Ethernet running at a time depending on the end goal desired
>>
>>> I have an idea that we can use multiple struct irq_domains to make
>>> this work in the existing IRQ framework, but it would be helpful to
>>> know more about the bigger picture first.
>>
>> Yeah, would be great if there is a way this can be solved without having
>> to introduce additional API.
>>
> 
> 
> Here is what I came up with to use existing IRQ APIs to implement event
> mapping.
> Basically it is the same as my previous suggestion [1], with the
> addition of
> multiple IRQ domains.

First of all, many thanks for looking into the problem and providing
patches for the alternate solutions. If we were to not use any exported
functions, this approach does seem to be a viable solution. I am going
to play around with both [1] and this patch with all our existing
usecases and see if I run into any issues.

So, w.r.t this patch compared to [1], is the multiple IRQ domain solving
anything specifically? Our main issue is the re-purposing of a event
(and its mapping depending on the application), and the same issue will
remain whether we have multiple domains or not. Also, now we would
expect an event to migrate between different domains based on its usage.

> 
> The idea is that each external interrupt controller (or DMA controller,
> etc.)
> that is connected to the PRUSS interrupt controller is considered an
> interrupt
> domain. One of the objections to my previous patch was that we could
> only have
> one IRQ descriptor per event. Now we can have one descriptor per event per
> domain.
> 
> I am still proposing that we use the interrupt-cells and identical vendor
> resource data structures in the PRU firmware be used to provide the mapping
> information. (As a side note, I still think it is important to include
> EVTSEL
> on AM18xx in order to fully describe the event.)

W.r.t EVTSEL, it is a global value and applies to a range of events. I
have another equivalent register/functionality on most of the other SoCs
as well (a register in PRUSS_CFG space) that muxes standard events vs
MII_RT events. Again, that is limited to only a subset of all the system
events. So, should this continue to be a per event specifier, it will be
yet another mapping configuration data item (my idea was to manage this
once per application within the PRU remoteproc driver along with the
fwspec mapping).

regards
Suman

> 
> The bindings will have N = 4 cells (or N = 5 when EVTSEL is required to
> fully
> describe the event):
> 
>     Cell 0: The PRUSS event number, e.g. 0 to 64 for most PRUSSs
>     Cell 1: The EVTSEL value (omitted when N == 4), e.g. 0, 1 or
>         TI_PRUSS_INTC_EVTSEL_ANY if the event is the same for all EVTSEL
>         values. On AM18xx, external events will all require 0 or 1 while
>         system events will always be TI_PRUSS_INTC_EVTSEL_ANY.
>     Cell N-3: The channel that the event gets mapped to, e.g. 0 to 9
>     Cell N-2: The host that the channel gets mapped to, e.g. 0 to 9
>     Cell N-1: The interrupt domain, e.g. TI_PRUSS_INTC_DOMAIN_PRU or
>         TI_PRUSS_INTC_DOMAIN_MCU
> 
> The TI_PRUSS_INTC_DOMAIN_* values are just arbitrary numbers assigned to
> the
> possible domains. For example, on AM18xx and AM33xx, there are just two
> domains,
> the PRU domain for host 0 and host 1 and the MCU domain for host 2 thru 9.
> Looking at the AM65xx manual, it looks like it would have 4 domains, the
> PRU
> domain, the RTU PRU domain, the MCU domain and a task manager domain.
> (And I
> suppose that domains could even be more granular if needed, e.g. we
> could drop
> the arbitrary domain number and treat each host interrupt/event as an
> interrupt
> domain, then there would be an IRQ descriptor per PRU INTC event per host.)
> 
> The AM18xx example I have been using will look like this in the device
> tree:
> 
>     interrupts = <63 TI_PRUSS_INTC_EVTSEL_ANY 0 0
> TI_PRUSS_INTC_DOMAIN_PRU>,
>              <62 TI_PRUSS_INTC_EVTSEL_ANY 2 2 TI_PRUSS_INTC_DOMAIN_MCU>;
> 
> To keep parsing simple, the PRU firmware can include vendor resources
> that have
> essentially the same format as the device tree bindings. For example:
> 
> enum {
>     /* IRQ descriptor without EVTSEL */
>     TI_PRU_VENDOR_RESOURCE_IRQ = RSC_VENDOR_START,
>     /* IRQ descriptor with EVTSEL */
>     TI_PRU_VENDOR_RESOURCE_IRQ2,
> };
> 
> struct ti_pru_vendor_resource_irq {
>     __le32 event;
>     __le32 channel;
>     __le32 host;
>     __le32 domain;
> };
> 
> struct ti_pru_vendor_resource_irq2 {
>     __le32 event;
>     __le32 evt_sel;
>     __le32 channel;
>     __le32 host;
>     __le32 domain;
> };
> 
> Then we can provide a vendor resource hook in the remoteproc driver to
> handle
> these resources:
> 
> static int ti_pru_rproc_handle_rsc(struct rproc *rproc, u32 rsc_type,
> void *rsc,
>                    int offset, int avail)
> {
>     struct ti_pru_data *pru = rproc->priv;
>     struct irq_fwspec fwspec;
>     unsigned int virq;
> 
>     switch (rsc_type) {
>     case TI_PRU_VENDOR_RESOURCE_IRQ:
>     {
>         struct ti_pru_vendor_resource_irq *rsc_irq = rsc;
> 
>         fwspec.fwnode = pru->intc_fwnode;
>         fwspec.param[0] = le32_to_cpu(rsc_irq->event);
>         fwspec.param[1] = le32_to_cpu(rsc_irq->channel);
>         fwspec.param[2] = le32_to_cpu(rsc_irq->host);
>         fwspec.param[3] = le32_to_cpu(rsc_irq->domain);
>         fwspec.param_count = 4;
>     }
>         break;
>     case TI_PRU_VENDOR_RESOURCE_IRQ2:
>     {
>         struct ti_pru_vendor_resource_irq2 *rsc_irq2 = rsc;
> 
>         fwspec.fwnode = pru->intc_fwnode;
>         fwspec.param[0] = le32_to_cpu(rsc_irq2->event);
>         fwspec.param[1] = le32_to_cpu(rsc_irq2->evt_sel);
>         fwspec.param[2] = le32_to_cpu(rsc_irq2->channel);
>         fwspec.param[3] = le32_to_cpu(rsc_irq2->host);
>         fwspec.param[4] = le32_to_cpu(rsc_irq2->domain);
>         fwspec.param_count = 5;
>         break;
>     }
>     default:
>         return RSC_IGNORED;
>     }
> 
>     virq = irq_create_fwspec_mapping(&fwspec);
>     if (!virq)
>         return -EINVAL;
> 
>     /* TODO: save virq (and other metadata) for later use */
> 
>     return RSC_HANDLED;
> }
> 
> static const struct rproc_ops ti_pru_rproc_ops = {
>     .start = ti_pru_rproc_start,
>     .stop = ti_pru_rproc_stop,
>     .kick = ti_pru_rproc_kick,
>     .da_to_va = ti_pru_rproc_da_to_va,
>     .handle_rsc = ti_pru_rproc_handle_rsc,
> };
> 
> The handle_rsc callback is called for each resource when the PRU is booted.
> The function irq_create_fwspec_mapping() causes the IRQ to be mapped in
> hardware. From what I understand from the previous discussions, this is
> exactly
> when we want this to happen.
> 
> This patch applies on top of "irqchip/irq-pruss-intc: Add a PRUSS
> irqchip driver
> for PRUSS interrupts", "irqchip/irq-pruss-intc: Add support for shared and
> invalid interrupts" and "irqchip/irq-pruss-intc: Implement irq_{get,set}
> _irqchip_state ops" from [PATCH v2 0/6] "Add TI PRUSS Local Interrupt
> Controller
> IRQChip driver" [2].
> 
> A working copy along with some remoteproc and rpmsg hacks can be found
> on my
> GitHub [3].
> 
> [1]:
> https://lore.kernel.org/lkml/fb2bdb7b-4d4d-508f-722a-554888280145@lechnology.com/
> 
> [2]: https://lore.kernel.org/lkml/20190731224149.11153-1-s-anna@ti.com/
> [3]: https://github.com/dlech/linux/commits/pruss-2019-08-08
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> Signed-off-by: Andrew F. Davis <afd@...com>
> Signed-off-by: Roger Quadros <rogerq@...com>
> Signed-off-by: David Lechner <david@...hnology.com>
> ---
>  drivers/irqchip/irq-pruss-intc.c              | 387 +++++++++++++++++-
>  .../interrupt-controller/ti-pruss.h           |  27 ++
>  2 files changed, 396 insertions(+), 18 deletions(-)
>  create mode 100644 include/dt-bindings/interrupt-controller/ti-pruss.h
> 
> diff --git a/drivers/irqchip/irq-pruss-intc.c
> b/drivers/irqchip/irq-pruss-intc.c
> index c1fd6c09f2f2..da4349df08c3 100644
> --- a/drivers/irqchip/irq-pruss-intc.c
> +++ b/drivers/irqchip/irq-pruss-intc.c
> @@ -5,6 +5,8 @@
>   * Copyright (C) 2016-2019 Texas Instruments Incorporated -
> http://www.ti.com/
>   *    Andrew F. Davis <afd@...com>
>   *    Suman Anna <s-anna@...com>
> + *
> + * Copyright (C) 2019 David Lechner <david@...hnology.com>
>   */
>  
>  #include <linux/interrupt.h>
> @@ -14,6 +16,14 @@
>  #include <linux/module.h>
>  #include <linux/of_device.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +
> +#include <dt-bindings/interrupt-controller/ti-pruss.h>
> +
> +/* The number of possible interrupt domains, see TI_PRUSS_INTC_DOMAIN_* in
> + * dt-bindings/interrupt-controller/ti-pruss.h
> + */
> +#define NUM_TI_PRUSS_INTC_DOMAIN 5
>  
>  /*
>   * Number of host interrupts reaching the main MPU sub-system. Note
> that this
> @@ -25,6 +35,12 @@
>  /* minimum starting host interrupt number for MPU */
>  #define MIN_PRU_HOST_INT    2
>  
> +/* maximum number of host interrupts */
> +#define MAX_PRU_HOST_INT    10
> +
> +/* maximum number of interrupt channels */
> +#define MAX_PRU_CHANNELS    10
> +
>  /* maximum number of system events */
>  #define MAX_PRU_SYS_EVENTS    64
>  
> @@ -57,27 +73,83 @@
>  #define PRU_INTC_HINLR(x)    (0x1100 + (x) * 4)
>  #define PRU_INTC_HIER        0x1500
>  
> +/* CMR register bit-field macros */
> +#define CMR_EVT_MAP_MASK    0xf
> +#define CMR_EVT_MAP_BITS    8
> +#define CMR_EVT_PER_REG        4
> +
> +/* HMR register bit-field macros */
> +#define HMR_CH_MAP_MASK        0xf
> +#define HMR_CH_MAP_BITS        8
> +#define HMR_CH_PER_REG        4
> +
>  /* HIPIR register bit-fields */
>  #define INTC_HIPIR_NONE_HINT    0x80000000
>  
> +/**
> + * struct pruss_intc_hwirq_data - additional metadata associated with a
> PRU
> + * system event
> + * @evtsel: The event select index (AM18xx only)
> + * @channel: The PRU INTC channel that the system event should be
> mapped to
> + * @host: The PRU INTC host that the channel should be mapped to
> + */
> +struct pruss_intc_hwirq_data {
> +    u8 evtsel;
> +    u8 channel;
> +    u8 host;
> +};
> +
> +/**
> + * struct pruss_intc_map_record - keeps track of actual mapping state
> + * @value: The currently mapped value (evtsel, channel or host)
> + * @ref_count: Keeps track of number of current users of this resource
> + */
> +struct pruss_intc_map_record {
> +    u8 value;
> +    u8 ref_count;
> +};
> +
> +/**
> + * struct pruss_intc_domain - information specific to an external IRQ
> domain
> + * @hwirq_data: Table of additional mapping data received from device tree
> + *    or PRU firmware
> + * @domain: irq domain
> + * @intc: the interrupt controller
> + * @id: Unique domain identifier (from device tree bindings)
> + */
> +struct pruss_intc_domain {
> +    struct pruss_intc_hwirq_data hwirq_data[MAX_PRU_SYS_EVENTS];
> +    struct irq_domain *domain;
> +    struct pruss_intc *intc;
> +    u32 id;
> +};
> +
>  /**
>   * struct pruss_intc - PRUSS interrupt controller structure
> + * @domain: External interrupt domains
> + * @evtsel: Tracks the current state of CFGCHIP3[3].PRUSSEVTSEL (AM18xx
> only)
> + * @event_channel: Tracks the current state of system event to channel
> mappings
> + * @channel_host: Tracks the current state of channel to host mappings
>   * @irqs: kernel irq numbers corresponding to PRUSS host interrupts
>   * @base: base virtual address of INTC register space
>   * @irqchip: irq chip for this interrupt controller
> - * @domain: irq domain for this interrupt controller
>   * @lock: mutex to serialize access to INTC
>   * @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
> + * @has_evtsel: indicates that the chip has an event select mux
>   */
>  struct pruss_intc {
> +    struct pruss_intc_domain domain[NUM_ISA_INTERRUPTS];
> +    struct pruss_intc_map_record evtsel;
> +    struct pruss_intc_map_record event_channel[MAX_PRU_SYS_EVENTS];
> +    struct pruss_intc_map_record channel_host[MAX_PRU_CHANNELS];
>      unsigned int irqs[MAX_NUM_HOST_IRQS];
>      void __iomem *base;
>      struct irq_chip *irqchip;
> -    struct irq_domain *domain;
>      struct mutex lock; /* PRUSS INTC lock */
>      u16 shared_intr;
>      u16 invalid_intr;
> +    bool has_evtsel;
>  };
>  
>  static inline u32 pruss_intc_read_reg(struct pruss_intc *intc, unsigned
> int reg)
> @@ -105,6 +177,172 @@ static int pruss_intc_check_write(struct
> pruss_intc *intc, unsigned int reg,
>      return 0;
>  }
>  
> +/**
> + * pruss_intc_map() - configure the PRUSS INTC
> + * @domain: pru intc domain pointer
> + * @hwirq: the system event number
> + *
> + * Configures the PRUSS INTC with the provided configuration from the one
> + * parsed in the xlate function. Any existing event to channel mappings or
> + * channel to host interrupt mappings are checked to make sure there
> are no
> + * conflicting configuration between both the PRU cores.
> + *
> + * Returns 0 on success, or a suitable error code otherwise
> + */
> +static int pruss_intc_map(struct pruss_intc_domain *domain, unsigned
> long hwirq)
> +{
> +    struct pruss_intc *intc = domain->intc;
> +    struct device* dev = intc->irqchip->parent_device;
> +    u32 val;
> +    int idx, ret;
> +    u8 evtsel, ch, host;
> +
> +    if (hwirq >= MAX_PRU_SYS_EVENTS)
> +        return -EINVAL;
> +
> +    mutex_lock(&intc->lock);
> +
> +    evtsel = domain->hwirq_data[hwirq].evtsel;
> +    ch = domain->hwirq_data[hwirq].channel;
> +    host = domain->hwirq_data[hwirq].host;
> +
> +    if (intc->has_evtsel && intc->evtsel.ref_count > 0 &&
> +        intc->evtsel.value != evtsel) {
> +        dev_err(dev, "event %lu (req. evtsel %d) already assigned to
> evtsel %d\n",
> +            hwirq, evtsel, intc->evtsel.value);
> +        ret = -EBUSY;
> +        goto unlock;
> +    }
> +
> +    /* check if sysevent already assigned */
> +    if (intc->event_channel[hwirq].ref_count > 0 &&
> +        intc->event_channel[hwirq].value != ch) {
> +        dev_err(dev, "event %lu (req. channel %d) already assigned to
> channel %d\n",
> +            hwirq, ch, intc->event_channel[hwirq].value);
> +        ret = -EBUSY;
> +        goto unlock;
> +    }
> +
> +    /* check if channel already assigned */
> +    if (intc->channel_host[ch].ref_count > 0 &&
> +        intc->channel_host[ch].value != host) {
> +        dev_err(dev, "channel %d (req. host %d) already assigned to
> host %d\n",
> +            ch, host, intc->channel_host[ch].value);
> +        ret = -EBUSY;
> +        goto unlock;
> +    }
> +
> +    if (++intc->evtsel.ref_count == 1) {
> +        intc->evtsel.value = evtsel;
> +
> +        /* TODO: need to implement CFGCHIP3[3].PRUSSEVTSEL */
> +    }
> +
> +    if (++intc->event_channel[hwirq].ref_count == 1) {
> +        intc->event_channel[hwirq].value = ch;
> +
> +        /*
> +         * configure channel map registers - each register holds map
> +         * info for 4 events, with each event occupying the lower nibble
> +         * in a register byte address in little-endian fashion
> +         */
> +        idx = hwirq / CMR_EVT_PER_REG;
> +
> +        val = pruss_intc_read_reg(intc, PRU_INTC_CMR(idx));
> +        val &= ~(CMR_EVT_MAP_MASK <<
> +                ((hwirq % CMR_EVT_PER_REG) * CMR_EVT_MAP_BITS));
> +        val |= ch << ((hwirq % CMR_EVT_PER_REG) * CMR_EVT_MAP_BITS);
> +        pruss_intc_write_reg(intc, PRU_INTC_CMR(idx), val);
> +
> +        dev_dbg(dev, "SYSEV%lu -> CH%d (CMR%d 0x%08x)\n", hwirq, ch,
> +            idx, pruss_intc_read_reg(intc, PRU_INTC_CMR(idx)));
> +
> +        /* clear and enable system event */
> +        pruss_intc_write_reg(intc, PRU_INTC_SICR, hwirq);
> +        pruss_intc_write_reg(intc, PRU_INTC_EISR, hwirq);
> +    }
> +
> +    if (++intc->channel_host[ch].ref_count == 1) {
> +        intc->channel_host[ch].value = host;
> +
> +        /*
> +         * set host map registers - each register holds map info for
> +         * 4 channels, with each channel occupying the lower nibble in
> +         * a register byte address in little-endian fashion
> +         */
> +        idx = ch / HMR_CH_PER_REG;
> +
> +        val = pruss_intc_read_reg(intc, PRU_INTC_HMR(idx));
> +        val &= ~(HMR_CH_MAP_MASK <<
> +                ((ch % HMR_CH_PER_REG) * HMR_CH_MAP_BITS));
> +        val |= host << ((ch % HMR_CH_PER_REG) * HMR_CH_MAP_BITS);
> +        pruss_intc_write_reg(intc, PRU_INTC_HMR(idx), val);
> +
> +        dev_dbg(dev, "CH%d -> HOST%d (HMR%d 0x%08x)\n", ch, host, idx,
> +            pruss_intc_read_reg(intc, PRU_INTC_HMR(idx)));
> +
> +        /* enable host interrupts */
> +        pruss_intc_write_reg(intc, PRU_INTC_HIEISR, host);
> +    }
> +
> +    dev_info(dev, "mapped system_event = %lu channel = %d host = %d
> domain = %u\n",
> +         hwirq, ch, host, domain->id);
> +
> +    /* global interrupt enable */
> +    pruss_intc_write_reg(intc, PRU_INTC_GER, 1);
> +
> +    mutex_unlock(&intc->lock);
> +    return 0;
> +
> +unlock:
> +    mutex_unlock(&intc->lock);
> +    return ret;
> +}
> +
> +/**
> + * pruss_intc_unmap() - unconfigure the PRUSS INTC
> + * @domain: pru intc domain pointer
> + * @hwirq: the system event number
> + *
> + * Undo whatever was done in pruss_intc_map() for a PRU core.
> + * Mappings are reference counted, so resources are only disabled when
> there
> + * are no longer any users.
> + */
> +static void pruss_intc_unmap(struct pruss_intc_domain *domain, unsigned
> long hwirq)
> +{
> +    struct pruss_intc *intc = domain->intc;
> +    struct device* dev = intc->irqchip->parent_device;
> +    u8 ch, host;
> +
> +    if (hwirq >= MAX_PRU_SYS_EVENTS)
> +        return;
> +
> +    mutex_lock(&intc->lock);
> +
> +    ch = intc->event_channel[hwirq].value;
> +    host = intc->channel_host[ch].value;
> +
> +    if (--intc->channel_host[ch].ref_count == 0) {
> +        /* disable host interrupts */
> +        pruss_intc_write_reg(intc, PRU_INTC_HIDISR, host);
> +    }
> +
> +    if (--intc->event_channel[hwirq].ref_count == 0) {
> +        /* disable system events */
> +        pruss_intc_write_reg(intc, PRU_INTC_EICR, hwirq);
> +        /* clear any pending status */
> +        pruss_intc_write_reg(intc, PRU_INTC_SICR, hwirq);
> +    }
> +
> +    if (intc->has_evtsel)
> +        intc->evtsel.ref_count--;
> +
> +    dev_info(dev, "unmapped system_event = %lu channel = %d host = %d\n",
> +         hwirq, ch, host);
> +
> +    mutex_unlock(&intc->lock);
> +}
> +
>  static void pruss_intc_init(struct pruss_intc *intc)
>  {
>      int i;
> @@ -198,10 +436,83 @@ static int pruss_intc_irq_set_irqchip_state(struct
> irq_data *data,
>      return pruss_intc_check_write(intc, PRU_INTC_SICR, data->hwirq);
>  }
>  
> +static int pruss_intc_irq_domain_select(struct irq_domain *d,
> +                    struct irq_fwspec *fwspec,
> +                    enum irq_domain_bus_token bus_token)
> +{
> +    struct pruss_intc_domain *domain = d->host_data;
> +    int num_cells = domain->intc->has_evtsel ? 5 : 4;
> +    u32 domain_id;
> +
> +    if (!fwspec || fwspec->fwnode != domain->domain->fwnode)
> +        return 0;
> +
> +    if (bus_token != DOMAIN_BUS_ANY && bus_token !=
> domain->domain->bus_token)
> +        return 0;
> +
> +    if (WARN_ON_ONCE(fwspec->param_count != num_cells))
> +        return 0;
> +
> +    domain_id = fwspec->param[fwspec->param_count - 1];
> +    if (domain_id != domain->id)
> +        return 0;
> +
> +    return 1;
> +}
> +
> +static int
> +pruss_intc_irq_domain_xlate(struct irq_domain *d, struct device_node
> *node,
> +                const u32 *intspec, unsigned int intsize,
> +                unsigned long *out_hwirq, unsigned int *out_type)
> +{
> +    struct pruss_intc_domain *domain = d->host_data;
> +    struct pruss_intc *intc = domain->intc;
> +    int num_cells = intc->has_evtsel ? 5 : 4;
> +    u32 sys_event, channel, host, domain_id;
> +    u32 evtsel = 0;
> +
> +    if (WARN_ON_ONCE(intsize != num_cells))
> +        return -EINVAL;
> +
> +    sys_event = intspec[0];
> +    if (sys_event >= MAX_PRU_SYS_EVENTS)
> +        return -EINVAL;
> +
> +    if (intc->has_evtsel)
> +        evtsel = intspec[1];
> +
> +    channel = intspec[intsize - 3];
> +    if (channel >= MAX_PRU_CHANNELS)
> +        return -EINVAL;
> +
> +    host = intspec[intsize - 2];
> +    if (host >= MAX_PRU_HOST_INT)
> +        return -EINVAL;
> +
> +    domain_id = intspec[intsize - 1];
> +    if (domain_id != domain->id)
> +        return -EINVAL;
> +
> +    domain->hwirq_data[sys_event].evtsel = evtsel;
> +    domain->hwirq_data[sys_event].channel = channel;
> +    domain->hwirq_data[sys_event].host = host;
> +
> +    *out_hwirq = sys_event;
> +    *out_type = IRQ_TYPE_NONE;
> +
> +    return 0;
> +}
> +
>  static int pruss_intc_irq_domain_map(struct irq_domain *d, unsigned int
> virq,
>                       irq_hw_number_t hw)
>  {
> -    struct pruss_intc *intc = d->host_data;
> +    struct pruss_intc_domain *domain = d->host_data;
> +    struct pruss_intc *intc = domain->intc;
> +    int err;
> +
> +    err = pruss_intc_map(domain, hw);
> +    if (err < 0)
> +        return err;
>  
>      irq_set_chip_data(virq, intc);
>      irq_set_chip_and_handler(virq, intc->irqchip, handle_level_irq);
> @@ -211,12 +522,17 @@ static int pruss_intc_irq_domain_map(struct
> irq_domain *d, unsigned int virq,
>  
>  static void pruss_intc_irq_domain_unmap(struct irq_domain *d, unsigned
> int virq)
>  {
> +    struct pruss_intc_domain *domain = d->host_data;
> +    unsigned long hwirq = irqd_to_hwirq(irq_get_irq_data(virq));
> +
>      irq_set_chip_and_handler(virq, NULL, NULL);
>      irq_set_chip_data(virq, NULL);
> +    pruss_intc_unmap(domain, hwirq);
>  }
>  
>  static const struct irq_domain_ops pruss_intc_irq_domain_ops = {
> -    .xlate    = irq_domain_xlate_onecell,
> +    .select    = pruss_intc_irq_domain_select,
> +    .xlate    = pruss_intc_irq_domain_xlate,
>      .map    = pruss_intc_irq_domain_map,
>      .unmap    = pruss_intc_irq_domain_unmap,
>  };
> @@ -245,7 +561,8 @@ static void pruss_intc_irq_handler(struct irq_desc
> *desc)
>      hipir = pruss_intc_read_reg(intc, PRU_INTC_HIPIR(i));
>      while (!(hipir & INTC_HIPIR_NONE_HINT)) {
>          hwirq = hipir & GENMASK(9, 0);
> -        virq = irq_linear_revmap(intc->domain, hwirq);
> +        virq = irq_linear_revmap(
> +            intc->domain[TI_PRUSS_INTC_DOMAIN_MCU].domain, hwirq);
>  
>          /*
>           * NOTE: manually ACK any system events that do not have a
> @@ -272,7 +589,8 @@ static int pruss_intc_probe(struct platform_device
> *pdev)
>      struct pruss_intc *intc;
>      struct resource *res;
>      struct irq_chip *irqchip;
> -    int i, irq, count;
> +    int i, err, irq, count;
> +    u32 num_cells;
>      u8 temp_intr[MAX_NUM_HOST_IRQS] = { 0 };
>  
>      intc = devm_kzalloc(dev, sizeof(*intc), GFP_KERNEL);
> @@ -323,13 +641,22 @@ static int pruss_intc_probe(struct platform_device
> *pdev)
>          }
>      }
>  
> +    err = of_property_read_u32(dev->of_node, "#interrupt-cells",
> &num_cells);
> +    if (!err && num_cells == 5)
> +        intc->has_evtsel = true;
> +
>      mutex_init(&intc->lock);
>  
> +    pm_runtime_enable(dev);
> +    pm_runtime_get_sync(dev);
> +
>      pruss_intc_init(intc);
>  
>      irqchip = devm_kzalloc(dev, sizeof(*irqchip), GFP_KERNEL);
> -    if (!irqchip)
> -        return -ENOMEM;
> +    if (!irqchip) {
> +        err = -ENOMEM;
> +        goto fail_alloc;
> +    }
>  
>      irqchip->irq_ack = pruss_intc_irq_ack;
>      irqchip->irq_mask = pruss_intc_irq_mask;
> @@ -338,14 +665,24 @@ static int pruss_intc_probe(struct platform_device
> *pdev)
>      irqchip->irq_release_resources = pruss_intc_irq_relres;
>      irqchip->irq_get_irqchip_state = pruss_intc_irq_get_irqchip_state;
>      irqchip->irq_set_irqchip_state = pruss_intc_irq_set_irqchip_state;
> +    irqchip->parent_device = dev;
>      irqchip->name = dev_name(dev);
>      intc->irqchip = irqchip;
>  
> -    /* always 64 events */
> -    intc->domain = irq_domain_add_linear(dev->of_node, MAX_PRU_SYS_EVENTS,
> -                         &pruss_intc_irq_domain_ops, intc);
> -    if (!intc->domain)
> -        return -ENOMEM;
> +    for (i = 0; i < NUM_TI_PRUSS_INTC_DOMAIN; i++) {
> +        intc->domain[i].intc = intc;
> +        intc->domain[i].id = i;
> +        /* always 64 events */
> +        intc->domain[i].domain = irq_domain_add_linear(dev->of_node,
> +                MAX_PRU_SYS_EVENTS, &pruss_intc_irq_domain_ops,
> +                &intc->domain[i]);
> +        if (!intc->domain[i].domain) {
> +            while (--i >= 0)
> +                irq_domain_remove(intc->domain[i].domain);
> +            err = -ENOMEM;
> +            goto fail_alloc;
> +        }
> +    }
>  
>      for (i = 0; i < MAX_NUM_HOST_IRQS; i++) {
>          irq = platform_get_irq_byname(pdev, irq_names[i]);
> @@ -356,6 +693,7 @@ static int pruss_intc_probe(struct platform_device
> *pdev)
>  
>              dev_err(dev, "platform_get_irq_byname failed for %s : %d\n",
>                  irq_names[i], irq);
> +            err = irq;
>              goto fail_irq;
>          }
>  
> @@ -372,13 +710,20 @@ static int pruss_intc_probe(struct platform_device
> *pdev)
>              irq_set_chained_handler_and_data(intc->irqs[i], NULL,
>                               NULL);
>      }
> -    irq_domain_remove(intc->domain);
> -    return irq;
> +    for (i = 0; i < NUM_TI_PRUSS_INTC_DOMAIN; i++)
> +        irq_domain_remove(intc->domain[i].domain);
> +
> +fail_alloc:
> +    pm_runtime_put(dev);
> +    pm_runtime_disable(dev);
> +
> +    return err;
>  }
>  
>  static int pruss_intc_remove(struct platform_device *pdev)
>  {
>      struct pruss_intc *intc = platform_get_drvdata(pdev);
> +    struct device *dev = &pdev->dev;
>      unsigned int hwirq;
>      int i;
>  
> @@ -388,9 +733,15 @@ static int pruss_intc_remove(struct platform_device
> *pdev)
>                               NULL);
>      }
>  
> -    for (hwirq = 0; hwirq < MAX_PRU_SYS_EVENTS; hwirq++)
> -        irq_dispose_mapping(irq_find_mapping(intc->domain, hwirq));
> -    irq_domain_remove(intc->domain);
> +    for (i = 0; i < NUM_TI_PRUSS_INTC_DOMAIN; i++) {
> +        for (hwirq = 0; hwirq < MAX_PRU_SYS_EVENTS; hwirq++)
> +            irq_dispose_mapping(irq_find_mapping(
> +                        intc->domain[i].domain, hwirq));
> +        irq_domain_remove(intc->domain[i].domain);
> +    }
> +
> +    pm_runtime_put(dev);
> +    pm_runtime_disable(dev);
>  
>      return 0;
>  }
> diff --git a/include/dt-bindings/interrupt-controller/ti-pruss.h
> b/include/dt-bindings/interrupt-controller/ti-pruss.h
> new file mode 100644
> index 000000000000..326a68c31bce
> --- /dev/null
> +++ b/include/dt-bindings/interrupt-controller/ti-pruss.h
> @@ -0,0 +1,27 @@
> +/* SPDX-License-Identifier: GPL-2.0 OR MIT */
> +/*
> + * This header provides constants for the Texas Instruments Programmable
> + * Realtime Unit Subsystem (PRUSS) interrupt controller.
> + */
> +
> +#ifndef _DT_BINDINGS_INTERRUPT_CONTROLLER_TI_PRUSS_H
> +#define _DT_BINDINGS_INTERRUPT_CONTROLLER_TI_PRUSS_H
> +
> +/* interrupt specifier for optional cell 1 */
> +
> +#define TI_PRUSS_INTC_EVTSEL_ANY    0xffffffff
> +
> +/* interrupt specifier for cell #interrupt-cells - 1 */
> +
> +/* host interrupt is connected to PRU cores, e.g. host events 0 and 1 */
> +#define TI_PRUSS_INTC_DOMAIN_PRU    0
> +/* host interrupt is connected to MCU's interrupt controller  */
> +#define TI_PRUSS_INTC_DOMAIN_MCU    1
> +/* host interrupt is connected to DSP's interrupt controller  */
> +#define TI_PRUSS_INTC_DOMAIN_DSP    2
> +/* host interrupt is connected to the auxillary PRU cores  */
> +#define TI_PRUSS_INTC_DOMAIN_RTU_PRU    3
> +/* host interrupt is connected to the task managers  */
> +#define TI_PRUSS_INTC_DOMAIN_TASK    4
> +
> +#endif /* _DT_BINDINGS_INTERRUPT_CONTROLLER_TI_PRUSS_H */

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