[PATCH v3 1/7] ARM: davinci, intc: Add OF support for TI interrupt controller
Grant Likely
grant.likely at secretlab.ca
Sat May 19 16:16:28 EST 2012
On Mon, 5 Mar 2012 12:09:58 +0100, Heiko Schocher <hs at denx.de> wrote:
> Add a function to initialize the Common Platform Interrupt Controller
> (cp_intc) from TI used on OMAP-L1x SoCs using a device tree node.
>
> Signed-off-by: Heiko Schocher <hs at denx.de>
> Cc: davinci-linux-open-source at linux.davincidsp.com
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: devicetree-discuss at lists.ozlabs.org
> Cc: Grant Likely <grant.likely at secretlab.ca>
> Cc: Sekhar Nori <nsekhar at ti.com>
> Cc: Wolfgang Denk <wd at denx.de>
> Cc: Sergei Shtylyov <sshtylyov at mvista.com>
>
> ---
> - changes for v2:
> - add comment from Grant Likely:
> - migrate the whole interrupt controller to natively use an
> irq_domain. Rebased complete patchserie to:
> git://git.secretlab.ca/git/linux-2.6.git irqdomain/next
>
> commit 3a806bfcde2cc3e4853f2807b2e3c94e7ccaf450
> Author: Grant Likely <grant.likely at secretlab.ca>
> Date: Fri Jan 27 06:44:34 2012 -0700
>
> irq_domain: mostly eliminate slow-path revmap lookups
> - changes for v3:
> - add comments from Sergei Shtylyov:
> - rename compatible" prop to "ti,cp_intc"
> - cp_intc_init() is now also for the of case
> the name of the init function (it calls the
> "new" __cp_intc_init() function, which was
> the "old" cp_intc_init()). Through this
> rework the changes for OF is better visible.
> As the OF case uses the irq_domain rework from
> Grant Likely, maybe the none OF case can use
> this also, but this should be tested on a hw ...
> - rebased to:
> git://git.secretlab.ca/git/linux-2.6.git irqdomain/next
>
> commit 280ad7fda5f95211857fda38960f2b6fdf6edd3e
> Author: Grant Likely <grant.likely at secretlab.ca>
> Date: Fri Feb 24 14:58:54 2012 -0700
>
> mfd: twl-core: Add IRQ_DOMAIN dependency
>
> .../devicetree/bindings/arm/davinci/intc.txt | 27 ++++++
> arch/arm/mach-davinci/cp_intc.c | 87 +++++++++++++++++--
> 2 files changed, 104 insertions(+), 10 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/arm/davinci/intc.txt
>
> diff --git a/Documentation/devicetree/bindings/arm/davinci/intc.txt b/Documentation/devicetree/bindings/arm/davinci/intc.txt
> new file mode 100644
> index 0000000..dfd6a560
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/davinci/intc.txt
> @@ -0,0 +1,27 @@
> +* TI Common Platform Interrupt Controller
> +
> +Common Platform Interrupt Controller (cp_intc) is used on
> +OMAP-L1x SoCs and can support several configurable number
> +of interrupts.
> +
> +Main node required properties:
> +
> +- compatible : should be:
> + "ti,cp_intc"
> +- interrupt-controller : Identifies the node as an interrupt controller
> +- #interrupt-cells : Specifies the number of cells needed to encode an
> + interrupt source. The type shall be a <u32> and the value shall be 1.
> +
> + The cell contains the interrupt number in the range [0-128].
> +- ti,intc-size: Number of interrupts handled by the interrupt controller.
> +- reg: physical base address and size of the intc registers map.
> +
> +Example:
> +
> + intc: interrupt-controller at 1 {
> + compatible = "ti,cp_intc";
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + ti,intc-size = <101>;
> + reg = <0xfffee000 0x2000>;
> + };
> diff --git a/arch/arm/mach-davinci/cp_intc.c b/arch/arm/mach-davinci/cp_intc.c
> index f83152d..585114a 100644
> --- a/arch/arm/mach-davinci/cp_intc.c
> +++ b/arch/arm/mach-davinci/cp_intc.c
> @@ -9,9 +9,14 @@
> * kind, whether express or implied.
> */
>
> +#include <linux/export.h>
> #include <linux/init.h>
> #include <linux/irq.h>
> +#include <linux/irqdomain.h>
> #include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
>
> #include <mach/common.h>
> #include <mach/cp_intc.h>
> @@ -99,18 +104,45 @@ static struct irq_chip cp_intc_irq_chip = {
> .irq_set_wake = cp_intc_set_wake,
> };
>
> -void __init cp_intc_init(void)
> +static struct irq_domain *cp_intc_domain;
> +
> +static int cp_intc_host_map(struct irq_domain *h, unsigned int virq,
> + irq_hw_number_t hw)
> {
> - unsigned long num_irq = davinci_soc_info.intc_irq_num;
> + pr_debug("cp_intc_host_map(%d, 0x%lx)\n", virq, hw);
> +
> + irq_set_chip(virq, &cp_intc_irq_chip);
> + set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
> + irq_set_handler(virq, handle_edge_irq);
> + return 0;
> +}
> +
> +static const struct irq_domain_ops cp_intc_host_ops = {
> + .map = cp_intc_host_map,
> + .xlate = irq_domain_xlate_onetwocell,
> +};
> +
> +int __init __cp_intc_init(struct device_node *node,
> + struct device_node *parent)
> +{
> + u32 num_irq = davinci_soc_info.intc_irq_num;
> u8 *irq_prio = davinci_soc_info.intc_irq_prios;
> u32 *host_map = davinci_soc_info.intc_host_map;
> unsigned num_reg = BITS_TO_LONGS(num_irq);
> - int i;
> + int i, irq_base;
>
> davinci_intc_type = DAVINCI_INTC_TYPE_CP_INTC;
> - davinci_intc_base = ioremap(davinci_soc_info.intc_base, SZ_8K);
> + if (node) {
> + davinci_intc_base = of_iomap(node, 0);
> + if (of_property_read_u32(node, "ti,intc-size", &num_irq))
> + pr_warn("unable to get intc-size, default to %d\n",
> + num_irq);
> + } else {
> + davinci_intc_base = ioremap(davinci_soc_info.intc_base,
> + SZ_8K);
> + }
> if (WARN_ON(!davinci_intc_base))
> - return;
> + return -EINVAL;
>
> cp_intc_write(0, CP_INTC_GLOBAL_ENABLE);
>
> @@ -165,13 +197,48 @@ void __init cp_intc_init(void)
> for (i = 0; host_map[i] != -1; i++)
> cp_intc_write(host_map[i], CP_INTC_HOST_MAP(i));
>
> - /* Set up genirq dispatching for cp_intc */
> - for (i = 0; i < num_irq; i++) {
> - irq_set_chip(i, &cp_intc_irq_chip);
> - set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
> - irq_set_handler(i, handle_edge_irq);
> + if (node) {
> + irq_base = irq_alloc_descs(-1, 0, num_irq, 0);
> + if (irq_base < 0) {
> + pr_warn("Couldn't allocate IRQ numbers\n");
> + irq_base = 0;
> + }
> +
> + /* create a legacy host */
> + cp_intc_domain = irq_domain_add_legacy(node, num_irq,
> + irq_base, 0, &cp_intc_host_ops, NULL);
> + if (cp_intc_domain == NULL) {
> + pr_err("CP INTC: failed to allocate irq host!\n");
> + return -EINVAL;
> + }
> + } else {
> + /* Set up genirq dispatching for cp_intc */
> + for (i = 0; i < num_irq; i++) {
> + irq_set_chip(i, &cp_intc_irq_chip);
> + set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
> + irq_set_handler(i, handle_edge_irq);
> + }
No need for the if/else clause here. irq_domain should be used for
both DT and non-DT. It makes the code a lot simpler that way. The
only difference I would suggest is to call irq_domain_add_linear() in
the DT case instead of irq_domain_add_legacy()... and this is
temporary too until I fix up the irq_domain code to better handle both
static and dynamic mapping.
> }
>
> /* Enable global interrupt */
> cp_intc_write(1, CP_INTC_GLOBAL_ENABLE);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static struct of_device_id irq_match[] __initdata = {
> + { .compatible = "ti,cp_intc", .data = __cp_intc_init, },
> + { }
> +};
> +
> +void __init cp_intc_init(void)
> +{
> + of_irq_init(irq_match);
> +}
> +#else
> +void __init cp_intc_init(void)
> +{
> + __cp_intc_init(NULL, NULL);
> }
> +#endif
This is broken. Turning on CONFIG_OF must not disable non-DT users.
It needs to be reworked to be conditional at runtime.
g.
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