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Commit 845956b5 authored by Prateek Sood's avatar Prateek Sood Committed by Jeevan Shriram
Browse files

soc: qcom: Add support for secure eud 



Secure EUD requires programming the secure
ENABLE register in EUD_MODE_MANAGER2. Add
support to enable secure EUD.

Change-Id: I1ce1ea3a2124169a84640b34a3883061a64af1f4
Signed-off-by: default avatarPrateek Sood <prsood@codeaurora.org>
parent 8d21e82f

Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt

+4 −0
Original line number Diff line number Diff line
@@ -11,6 +11,10 @@ Required properties: 
 - reg: Should be address and size of EUD register space

 - reg-names: Should be "eud_base"



Optional properties:

 - reg-names: Can be "eud_mode_mgr2" for secure eud

 - qcom,secure-eud-en: To enable secure eud



Driver notifies clients via extcon for VBUS spoof attach/detach

and charger enable/disable events. Clients registered for these

notifications should have extcon property set to eud.

drivers/soc/qcom/eud.c

+41 −1
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/delay.h>

#include <linux/sysfs.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/bitops.h>

#include <linux/tty.h>

#include <linux/tty_flip.h>
@@ -22,6 +23,7 @@ 
#include <linux/serial.h>

#include <linux/workqueue.h>

#include <linux/power_supply.h>

#include <soc/qcom/scm.h>



#define EUD_ENABLE_CMD 1

#define EUD_DISABLE_CMD 0
@@ -32,6 +34,7 @@ 
#define EUD_REG_COM_RX_ID	0x000C

#define EUD_REG_COM_RX_LEN	0x0010

#define EUD_REG_COM_RX_DAT	0x0014

#define EUD_REG_EUD_EN2		0x0000

#define EUD_REG_INT1_EN_MASK	0x0024

#define EUD_REG_INT_STATUS_1	0x0044

#define EUD_REG_CTL_OUT_1	0x0074
@@ -66,6 +69,8 @@ struct eud_chip { 
	struct uart_port		port;

	struct work_struct		eud_work;

	struct power_supply		*batt_psy;

	bool				secure_eud_en;

	phys_addr_t			eud_mode_mgr2_phys_base;

};



static const unsigned int eud_extcon_cable[] = {
@@ -120,6 +125,14 @@ static void enable_eud(struct platform_device *pdev) 
		/* Enable vbus, chgr & safe mode warning interrupts */

		writel_relaxed(EUD_INT_VBUS | EUD_INT_CHGR | EUD_INT_SAFE_MODE,

				priv->eud_reg_base + EUD_REG_INT1_EN_MASK);

		/* Enable secure eud if supported */

		if (priv->secure_eud_en) {

			ret = scm_io_write(priv->eud_mode_mgr2_phys_base +

					   EUD_REG_EUD_EN2, EUD_ENABLE_CMD);

			if (ret)

				dev_err(&pdev->dev,

				"scm_io_write failed with rc:%d\n", ret);

		}



		/* Ensure Register Writes Complete */

		wmb();
@@ -143,10 +156,21 @@ static void enable_eud(struct platform_device *pdev) 
static void disable_eud(struct platform_device *pdev)

{

	struct eud_chip *priv = platform_get_drvdata(pdev);

	int ret;



	/* write into CSR to disable EUD */

	writel_relaxed(0, priv->eud_reg_base + EUD_REG_CSR_EUD_EN);

	dev_dbg(&pdev->dev, "%s: EUD is Disabled\n", __func__);



	/* Disable secure eud if supported */

	if (priv->secure_eud_en) {

		ret = scm_io_write(priv->eud_mode_mgr2_phys_base +

				   EUD_REG_EUD_EN2, EUD_DISABLE_CMD);

		if (ret)

			dev_err(&pdev->dev,

			"scm_io_write failed with rc:%d\n", ret);

	}



	dev_dbg(&pdev->dev, "%s: EUD Disabled!\n", __func__);

}



static int param_eud_set(const char *val, const struct kernel_param *kp)
@@ -525,6 +549,22 @@ static int msm_eud_probe(struct platform_device *pdev) 


	chip->eud_irq = platform_get_irq_byname(pdev, "eud_irq");



	chip->secure_eud_en = of_property_read_bool(pdev->dev.of_node,

			      "qcom,secure-eud-en");

	if (chip->secure_eud_en) {

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

						   "eud_mode_mgr2");

		if (!res) {

			dev_err(chip->dev,

			"%s: failed to get resource eud_mode_mgr2\n",

			__func__);

			ret = -ENOMEM;

			return ret;

		}



		chip->eud_mode_mgr2_phys_base = res->start;

	}



	ret = devm_request_irq(&pdev->dev, chip->eud_irq, handle_eud_irq,

				IRQF_TRIGGER_HIGH, "eud_irq", chip);

	if (ret) {