diff options
Diffstat (limited to 'recipes-kernel/linux/linux-yocto/generic-drivers/mpm/0002-irqchip-irq-qcom-mpm-Support-passing-a-slice-of-SRAM.patch')
| -rw-r--r-- | recipes-kernel/linux/linux-yocto/generic-drivers/mpm/0002-irqchip-irq-qcom-mpm-Support-passing-a-slice-of-SRAM.patch | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-yocto/generic-drivers/mpm/0002-irqchip-irq-qcom-mpm-Support-passing-a-slice-of-SRAM.patch b/recipes-kernel/linux/linux-yocto/generic-drivers/mpm/0002-irqchip-irq-qcom-mpm-Support-passing-a-slice-of-SRAM.patch new file mode 100644 index 0000000..bb9a7c3 --- /dev/null +++ b/recipes-kernel/linux/linux-yocto/generic-drivers/mpm/0002-irqchip-irq-qcom-mpm-Support-passing-a-slice-of-SRAM.patch @@ -0,0 +1,78 @@ +From 24ac56bf8085adf448b6db9574d9b16ed5cd6c0b Mon Sep 17 00:00:00 2001 +From: Konrad Dybcio <konrad.dybcio@linaro.org> +Date: Wed, 5 Apr 2023 12:48:35 +0200 +Subject: [PATCH 2/2] irqchip: irq-qcom-mpm: Support passing a slice of SRAM as + reg space + +The MPM hardware is accessible to us from the ARM CPUs through a shared +memory region (RPM MSG RAM) that's also concurrently accessed by other +kinds of cores on the system (like modem, ADSP etc.). Modeling this +relation in a (somewhat) sane manner in the device tree basically +requires us to either present the MPM as a child of said memory region +(which makes little sense, as a mapped memory carveout is not a bus), +define nodes which bleed their register spaces into one another, or +passing their slice of the MSG RAM through some kind of a property. + +Go with the third option and add a way to map a region passed through +the "qcom,rpm-msg-ram" property as our register space. + +The current way of using 'reg' is preserved for ABI reasons. + +Acked-by: Shawn Guo <shawn.guo@linaro.org> +Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org> +Upstream-Status: Backport [https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 24ac56bf8085] +--- + drivers/irqchip/irq-qcom-mpm.c | 21 ++++++++++++++++++--- + 1 file changed, 18 insertions(+), 3 deletions(-) + +diff --git a/drivers/irqchip/irq-qcom-mpm.c b/drivers/irqchip/irq-qcom-mpm.c +index 7124565234a5..7115e3056aa5 100644 +--- a/drivers/irqchip/irq-qcom-mpm.c ++++ b/drivers/irqchip/irq-qcom-mpm.c +@@ -14,6 +14,7 @@ + #include <linux/mailbox_client.h> + #include <linux/module.h> + #include <linux/of.h> ++#include <linux/of_address.h> + #include <linux/of_platform.h> + #include <linux/platform_device.h> + #include <linux/pm_domain.h> +@@ -322,8 +323,10 @@ static int qcom_mpm_init(struct device_node *np, struct device_node *parent) + struct device *dev = &pdev->dev; + struct irq_domain *parent_domain; + struct generic_pm_domain *genpd; ++ struct device_node *msgram_np; + struct qcom_mpm_priv *priv; + unsigned int pin_cnt; ++ struct resource res; + int i, irq; + int ret; + +@@ -374,9 +377,21 @@ static int qcom_mpm_init(struct device_node *np, struct device_node *parent) + + raw_spin_lock_init(&priv->lock); + +- priv->base = devm_platform_ioremap_resource(pdev, 0); +- if (IS_ERR(priv->base)) +- return PTR_ERR(priv->base); ++ /* If we have a handle to an RPM message ram partition, use it. */ ++ msgram_np = of_parse_phandle(np, "qcom,rpm-msg-ram", 0); ++ if (msgram_np) { ++ ret = of_address_to_resource(msgram_np, 0, &res); ++ /* Don't use devm_ioremap_resource, as we're accessing a shared region. */ ++ priv->base = devm_ioremap(dev, res.start, resource_size(&res)); ++ of_node_put(msgram_np); ++ if (IS_ERR(priv->base)) ++ return PTR_ERR(priv->base); ++ } else { ++ /* Otherwise, fall back to simple MMIO. */ ++ priv->base = devm_platform_ioremap_resource(pdev, 0); ++ if (IS_ERR(priv->base)) ++ return PTR_ERR(priv->base); ++ } + + for (i = 0; i < priv->reg_stride; i++) { + qcom_mpm_write(priv, MPM_REG_ENABLE, i, 0); +-- +2.39.2 + |