pinctrl: stm32: add firewall checks before probing the HDP driver

Because the HDP peripheral both depends on debug and firewall
configuration, when CONFIG_STM32_FIREWALL is present, use the
stm32 firewall framework to be able to check these configuration against
the relevant controllers.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Clément Le Goffic <legoffic.clement@gmail.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://lore.kernel.org/r/20260226-debug_bus-v6-12-5d794697798d@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32-hdp.c b/drivers/pinctrl/stm32/pinctrl-stm32-hdp.c
index 0b1dff01e04c11812105e14c9e9947d1ff5134ed..cce477e86ef90add460c34d1327f7f936aae2ad7 100644 (file)
--- a/drivers/pinctrl/stm32/pinctrl-stm32-hdp.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32-hdp.c
@@ -4,6 +4,7 @@
  * Author: Clément Le Goffic <clement.legoffic@foss.st.com> for STMicroelectronics.
  */
 #include <linux/bits.h>
+#include <linux/bus/stm32_firewall_device.h>
 #include <linux/clk.h>
 #include <linux/gpio/driver.h>
 #include <linux/gpio/generic.h>
@@ -46,9 +47,11 @@ struct stm32_hdp {
        void __iomem *base;
        struct clk *clk;
        struct pinctrl_dev *pctl_dev;
+       struct stm32_firewall *firewall;
        struct gpio_generic_chip gpio_chip;
        u32 mux_conf;
        u32 gposet_conf;
+       int nb_firewall_entries;
        const char * const *func_name;
 };
 
@@ -615,6 +618,13 @@ static int stm32_hdp_probe(struct platform_device *pdev)
                return -ENOMEM;
        hdp->dev = dev;
 
+       if (IS_ENABLED(CONFIG_STM32_FIREWALL)) {
+               err = stm32_firewall_get_grant_all_access(dev, &hdp->firewall,
+                                                         &hdp->nb_firewall_entries);
+               if (err)
+                       return err;
+       }
+
        platform_set_drvdata(pdev, hdp);
 
        hdp->base = devm_platform_ioremap_resource(pdev, 0);
@@ -670,8 +680,12 @@ static int stm32_hdp_probe(struct platform_device *pdev)
 static void stm32_hdp_remove(struct platform_device *pdev)
 {
        struct stm32_hdp *hdp = platform_get_drvdata(pdev);
+       int i;
 
        writel_relaxed(HDP_CTRL_DISABLE, hdp->base + HDP_CTRL);
+
+       for (i = 0; i < hdp->nb_firewall_entries; i++)
+               stm32_firewall_release_access(&hdp->firewall[i]);
 }
 
 static int stm32_hdp_suspend(struct device *dev)