[PATCH v5 3/5] usb: misc: eud: Add driver support for SM6115 / SM4250
From: Bhupesh Sharma
Date: Tue May 16 2023 - 17:33:44 EST
Add SM6115 / SM4250 SoC EUD support in qcom_eud driver.
On some SoCs (like the SM6115 / SM4250 SoC), the mode manager
needs to be accessed only via the secure world (through 'scm'
calls).
Also, the enable bit inside 'tcsr_check_reg' needs to be set
first to set the eud in 'enable' mode on these SoCs.
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@xxxxxxxxxx>
---
drivers/usb/misc/Kconfig | 1 +
drivers/usb/misc/qcom_eud.c | 69 +++++++++++++++++++++++++++++++++----
2 files changed, 63 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
index 99b15b77dfd5..fe1b5fec1dfc 100644
--- a/drivers/usb/misc/Kconfig
+++ b/drivers/usb/misc/Kconfig
@@ -147,6 +147,7 @@ config USB_APPLEDISPLAY
config USB_QCOM_EUD
tristate "QCOM Embedded USB Debugger(EUD) Driver"
depends on ARCH_QCOM || COMPILE_TEST
+ select QCOM_SCM
select USB_ROLE_SWITCH
help
This module enables support for Qualcomm Technologies, Inc.
diff --git a/drivers/usb/misc/qcom_eud.c b/drivers/usb/misc/qcom_eud.c
index b7f13df00764..10d194604d4c 100644
--- a/drivers/usb/misc/qcom_eud.c
+++ b/drivers/usb/misc/qcom_eud.c
@@ -5,12 +5,14 @@
#include <linux/bitops.h>
#include <linux/err.h>
+#include <linux/firmware/qcom/qcom_scm.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
@@ -22,23 +24,33 @@
#define EUD_REG_VBUS_INT_CLR 0x0080
#define EUD_REG_CSR_EUD_EN 0x1014
#define EUD_REG_SW_ATTACH_DET 0x1018
-#define EUD_REG_EUD_EN2 0x0000
+#define EUD_REG_EUD_EN2 0x0000
#define EUD_ENABLE BIT(0)
-#define EUD_INT_PET_EUD BIT(0)
+#define EUD_INT_PET_EUD BIT(0)
#define EUD_INT_VBUS BIT(2)
#define EUD_INT_SAFE_MODE BIT(4)
#define EUD_INT_ALL (EUD_INT_VBUS | EUD_INT_SAFE_MODE)
+#define EUD_EN2_EN BIT(0)
+#define EUD_EN2_DISABLE (0)
+#define TCSR_CHECK_EN BIT(0)
+
+struct eud_soc_cfg {
+ u32 tcsr_check_offset;
+};
+
struct eud_chip {
struct device *dev;
struct usb_role_switch *role_sw;
+ const struct eud_soc_cfg *eud_cfg;
void __iomem *base;
void __iomem *mode_mgr;
unsigned int int_status;
int irq;
bool enabled;
bool usb_attached;
+ phys_addr_t secure_mode_mgr;
};
static int enable_eud(struct eud_chip *priv)
@@ -46,7 +58,11 @@ static int enable_eud(struct eud_chip *priv)
writel(EUD_ENABLE, priv->base + EUD_REG_CSR_EUD_EN);
writel(EUD_INT_VBUS | EUD_INT_SAFE_MODE,
priv->base + EUD_REG_INT1_EN_MASK);
- writel(1, priv->mode_mgr + EUD_REG_EUD_EN2);
+
+ if (priv->secure_mode_mgr)
+ qcom_scm_io_writel(priv->secure_mode_mgr + EUD_REG_EUD_EN2, EUD_EN2_EN);
+ else
+ writel(EUD_EN2_EN, priv->mode_mgr + EUD_REG_EUD_EN2);
return usb_role_switch_set_role(priv->role_sw, USB_ROLE_DEVICE);
}
@@ -54,7 +70,11 @@ static int enable_eud(struct eud_chip *priv)
static void disable_eud(struct eud_chip *priv)
{
writel(0, priv->base + EUD_REG_CSR_EUD_EN);
- writel(0, priv->mode_mgr + EUD_REG_EUD_EN2);
+
+ if (priv->secure_mode_mgr)
+ qcom_scm_io_writel(priv->secure_mode_mgr + EUD_REG_EUD_EN2, EUD_EN2_DISABLE);
+ else
+ writel(EUD_EN2_DISABLE, priv->mode_mgr + EUD_REG_EUD_EN2);
}
static ssize_t enable_show(struct device *dev,
@@ -178,6 +198,8 @@ static void eud_role_switch_release(void *data)
static int eud_probe(struct platform_device *pdev)
{
struct eud_chip *chip;
+ struct resource *res;
+ phys_addr_t tcsr_check;
int ret;
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
@@ -200,9 +222,37 @@ static int eud_probe(struct platform_device *pdev)
if (IS_ERR(chip->base))
return PTR_ERR(chip->base);
- chip->mode_mgr = devm_platform_ioremap_resource(pdev, 1);
- if (IS_ERR(chip->mode_mgr))
- return PTR_ERR(chip->mode_mgr);
+ /*
+ * EUD block on a few Qualcomm SoCs needs secure register access.
+ * Check for the same.
+ */
+ if (of_device_is_compatible(chip->dev->of_node, "qcom,sm6115-eud")) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res)
+ return dev_err_probe(chip->dev, -ENODEV,
+ "failed to get secure_mode_mgr reg base\n");
+
+ chip->secure_mode_mgr = res->start;
+ } else {
+ chip->mode_mgr = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(chip->mode_mgr))
+ return PTR_ERR(chip->mode_mgr);
+ }
+
+ /* Check for any SoC specific config data */
+ chip->eud_cfg = of_device_get_match_data(&pdev->dev);
+ if (chip->eud_cfg) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "tcsr-base");
+ if (!res)
+ return dev_err_probe(chip->dev, -ENODEV,
+ "failed to get tcsr reg base\n");
+
+ tcsr_check = res->start + chip->eud_cfg->tcsr_check_offset;
+
+ ret = qcom_scm_io_writel(tcsr_check, TCSR_CHECK_EN);
+ if (ret)
+ return dev_err_probe(chip->dev, ret, "failed to write tcsr check reg\n");
+ }
chip->irq = platform_get_irq(pdev, 0);
ret = devm_request_threaded_irq(&pdev->dev, chip->irq, handle_eud_irq,
@@ -230,8 +280,13 @@ static int eud_remove(struct platform_device *pdev)
return 0;
}
+static const struct eud_soc_cfg sm6115_eud_cfg = {
+ .tcsr_check_offset = 0x25018,
+};
+
static const struct of_device_id eud_dt_match[] = {
{ .compatible = "qcom,sc7280-eud" },
+ { .compatible = "qcom,sm6115-eud", .data = &sm6115_eud_cfg },
{ }
};
MODULE_DEVICE_TABLE(of, eud_dt_match);
--
2.38.1