drivers/firmware/imx/misc.c

Source file repositories/reference/linux-study-clean/drivers/firmware/imx/misc.c

File Facts

System
Linux kernel
Corpus path
drivers/firmware/imx/misc.c
Extension
.c
Size
3492 bytes
Lines
138
Domain
Driver Families
Bucket
drivers/firmware
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_misc_set_ctrl {
	struct imx_sc_rpc_msg hdr;
	u32 ctrl;
	u32 val;
	u16 resource;
} __packed __aligned(4);

struct imx_sc_msg_req_cpu_start {
	struct imx_sc_rpc_msg hdr;
	u32 address_hi;
	u32 address_lo;
	u16 resource;
	u8 enable;
} __packed __aligned(4);

struct imx_sc_msg_req_misc_get_ctrl {
	struct imx_sc_rpc_msg hdr;
	u32 ctrl;
	u16 resource;
} __packed __aligned(4);

struct imx_sc_msg_resp_misc_get_ctrl {
	struct imx_sc_rpc_msg hdr;
	u32 val;
} __packed __aligned(4);

/*
 * This function sets a miscellaneous control value.
 *
 * @param[in]     ipc         IPC handle
 * @param[in]     resource    resource the control is associated with
 * @param[in]     ctrl        control to change
 * @param[in]     val         value to apply to the control
 *
 * @return Returns 0 for success and < 0 for errors.
 */

int imx_sc_misc_set_control(struct imx_sc_ipc *ipc, u32 resource,
			    u8 ctrl, u32 val)
{
	struct imx_sc_msg_req_misc_set_ctrl msg;
	struct imx_sc_rpc_msg *hdr = &msg.hdr;

	hdr->ver = IMX_SC_RPC_VERSION;
	hdr->svc = (uint8_t)IMX_SC_RPC_SVC_MISC;
	hdr->func = (uint8_t)IMX_SC_MISC_FUNC_SET_CONTROL;
	hdr->size = 4;

	msg.ctrl = ctrl;
	msg.val = val;
	msg.resource = resource;

	return imx_scu_call_rpc(ipc, &msg, true);
}
EXPORT_SYMBOL(imx_sc_misc_set_control);

/*
 * This function gets a miscellaneous control value.
 *
 * @param[in]     ipc         IPC handle
 * @param[in]     resource    resource the control is associated with
 * @param[in]     ctrl        control to get
 * @param[out]    val         pointer to return the control value
 *
 * @return Returns 0 for success and < 0 for errors.
 */

int imx_sc_misc_get_control(struct imx_sc_ipc *ipc, u32 resource,
			    u8 ctrl, u32 *val)
{
	struct imx_sc_msg_req_misc_get_ctrl msg;
	struct imx_sc_msg_resp_misc_get_ctrl *resp;
	struct imx_sc_rpc_msg *hdr = &msg.hdr;
	int ret;

	hdr->ver = IMX_SC_RPC_VERSION;
	hdr->svc = (uint8_t)IMX_SC_RPC_SVC_MISC;
	hdr->func = (uint8_t)IMX_SC_MISC_FUNC_GET_CONTROL;
	hdr->size = 3;

	msg.ctrl = ctrl;
	msg.resource = resource;

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

	resp = (struct imx_sc_msg_resp_misc_get_ctrl *)&msg;
	if (val != NULL)
		*val = resp->val;

Annotation

Implementation Notes