drivers/pinctrl/freescale/pinctrl-scu.c

Source file repositories/reference/linux-study-clean/drivers/pinctrl/freescale/pinctrl-scu.c

File Facts

System
Linux kernel
Corpus path
drivers/pinctrl/freescale/pinctrl-scu.c
Extension
.c
Size
3955 bytes
Lines
162
Domain
Driver Families
Bucket
drivers/pinctrl
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct imx_sc_msg_req_pad_set {
	struct imx_sc_rpc_msg hdr;
	u32 val;
	u16 pad;
} __packed __aligned(4);

struct imx_sc_msg_req_pad_get {
	struct imx_sc_rpc_msg hdr;
	u16 pad;
} __packed __aligned(4);

struct imx_sc_msg_resp_pad_get {
	struct imx_sc_rpc_msg hdr;
	u32 val;
} __packed;

struct imx_sc_msg_gpio_set_pad_wakeup {
	struct imx_sc_rpc_msg hdr;
	u16 pad;
	u8 wakeup;
} __packed __aligned(4);

static struct imx_sc_ipc *pinctrl_ipc_handle;

int imx_pinctrl_sc_ipc_init(struct platform_device *pdev)
{
	imx_scu_irq_group_enable(IMX_SC_IRQ_GROUP_WAKE,
					 IMX_SC_IRQ_PAD, true);
	return imx_scu_get_handle(&pinctrl_ipc_handle);
}
EXPORT_SYMBOL_GPL(imx_pinctrl_sc_ipc_init);

int imx_pinconf_get_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
			unsigned long *config)
{
	struct imx_sc_msg_req_pad_get msg;
	struct imx_sc_msg_resp_pad_get *resp;
	struct imx_sc_rpc_msg *hdr = &msg.hdr;
	int ret;

	hdr->ver = IMX_SC_RPC_VERSION;
	hdr->svc = IMX_SC_RPC_SVC_PAD;
	hdr->func = IMX_SC_PAD_FUNC_GET;
	hdr->size = 2;

	msg.pad = pin_id;

	ret = imx_scu_call_rpc(pinctrl_ipc_handle, &msg, true);
	if (ret)
		return ret;

	resp = (struct imx_sc_msg_resp_pad_get *)&msg;
	*config = resp->val;

	return 0;
}
EXPORT_SYMBOL_GPL(imx_pinconf_get_scu);

int imx_pinconf_set_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
			unsigned long *configs, unsigned num_configs)
{
	struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
	struct imx_sc_msg_req_pad_set msg;
	struct imx_sc_rpc_msg *hdr = &msg.hdr;
	unsigned int mux = configs[0];
	unsigned int conf;
	unsigned int val;
	int ret;

	if (num_configs == 1) {
		struct imx_sc_msg_gpio_set_pad_wakeup wmsg;

		hdr = &wmsg.hdr;
		hdr->ver = IMX_SC_RPC_VERSION;
		hdr->svc = IMX_SC_RPC_SVC_PAD;
		hdr->func = IMX_SC_PAD_FUNC_SET_WAKEUP;
		hdr->size = 2;
		wmsg.pad = pin_id;
		wmsg.wakeup = *configs;
		ret = imx_scu_call_rpc(pinctrl_ipc_handle, &wmsg, true);

		dev_dbg(ipctl->dev, "wakeup pin_id: %d type: %ld\n",
				pin_id, *configs);
		return ret;
	}

	/*
	 * Set mux and conf together in one IPC call
	 */
	WARN_ON(num_configs != 2);

Annotation

Implementation Notes