soc: qcom: add secure processor communication (spcom) driver

This driver supports communication with secure processor subsystem
(SPSS) over rpmsg and ungerlying glink transport layer. The
communication is based on using shared memory and interrupts.
Add snapshot for spcom driver from msm-4.19 commit b3159f82fb1b
("soc: qcom: spcom: fix active pid clean up").

Change-Id: Ic35584e8770980e2f480949808529a1d933da1f6
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>

drivers/soc/qcom/Kconfig

@@ -572,4 +572,16 @@ config QCOM_WATCHDOG
           deadlocks. It does not run during the bootup process, so it will
           not catch any early lockups.
 
+config MSM_SPCOM
+         depends on QCOM_GLINK
+         bool "Secure Processor Communication over RPMSG"
+         help
+	   SPCOM driver allows loading Secure Processor Applications and sending
+	   messages to Secure Processor Applications. SPCOM implements logic of RPMSG
+	   client of SPSS edge. SPCOM provides interface to both user space app and
+	   kernel driver. It is using glink as the transport layer, which provides
+	   multiple logical channels over single physical channel. The physical layer
+	   is based on shared memory and interrupts. SPCOM provides clients/server API
+	   although currently only one client/server is allowed per logical channel.
+
 endmenu

drivers/soc/qcom/Makefile

@@ -56,4 +56,5 @@ obj-$(CONFIG_MSM_IDLE_STATS)	+= lpm-stats.o
 obj-$(CONFIG_QTI_RPM_STATS_LOG) += rpmh_master_stat.o
 obj-$(CONFIG_QPNP_PBS) += qpnp-pbs.o
 obj-$(CONFIG_QCOM_WATCHDOG) += qcom_watchdog.o
+obj-$(CONFIG_MSM_SPCOM) += spcom.o
 obj-$(CONFIG_QCOM_FSA4480_I2C) += fsa4480-i2c.o

include/uapi/linux/spcom.h

@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2015-2019, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef _UAPI_SPCOM_H_
+#define _UAPI_SPCOM_H_
+
+#include <linux/types.h>	/* uint32_t, bool */
+#ifndef BIT
+	#define BIT(x) (1 << x)
+#endif
+
+#ifndef PAGE_SIZE
+	#define PAGE_SIZE 4096
+#endif
+
+/**
+ * @brief - Secure Processor Communication interface to user space spcomlib.
+ *
+ * Sending data and control commands by write() file operation.
+ * Receiving data by read() file operation.
+ * Getting the next request size by read() file operation,
+ * with special size SPCOM_GET_NEXT_REQUEST_SIZE.
+ */
+
+/*
+ * Maximum number of channel between Secure Processor and HLOS.
+ * including predefined channels, like "sp_kernel".
+ */
+#define SPCOM_MAX_CHANNELS	0x20
+
+/* Maximum size (including null) for channel names */
+#define SPCOM_CHANNEL_NAME_SIZE		32
+/*
+ * file read(fd, buf, size) with this size,
+ * hints the kernel that user space wants to read the next-req-size.
+ * This size is bigger than both SPCOM_MAX_REQUEST_SIZE and
+ * SPCOM_MAX_RESPONSE_SIZE , so it is not a valid data size.
+ */
+#define SPCOM_GET_NEXT_REQUEST_SIZE	(PAGE_SIZE-1)
+
+/* Command Id between spcomlib and spcom driver, on write() */
+enum spcom_cmd_id {
+	SPCOM_CMD_LOAD_APP	= 0x4C4F4144, /* "LOAD" = 0x4C4F4144 */
+	SPCOM_CMD_RESET_SP	= 0x52455354, /* "REST" = 0x52455354 */
+	SPCOM_CMD_SEND		= 0x53454E44, /* "SEND" = 0x53454E44 */
+	SPCOM_CMD_SEND_MODIFIED	= 0x534E444D, /* "SNDM" = 0x534E444D */
+	SPCOM_CMD_LOCK_ION_BUF  = 0x4C4F434B, /* "LOCK" = 0x4C4F434B */
+	SPCOM_CMD_UNLOCK_ION_BUF = 0x554C434B, /* "ULCK" = 0x4C4F434B */
+	SPCOM_CMD_FSSR		= 0x46535352, /* "FSSR" = 0x46535352 */
+	SPCOM_CMD_CREATE_CHANNEL = 0x43524554, /* "CRET" = 0x43524554 */
+
+#define SPCOM_CMD_ENABLE_SSR \
+	SPCOM_CMD_ENABLE_SSR
+	SPCOM_CMD_ENABLE_SSR     = 0x45535352,   /* "ESSR" =0x45535352*/
+
+#define SPCOM_CMD_RESTART_SP \
+	SPCOM_CMD_RESTART_SP
+	SPCOM_CMD_RESTART_SP         = 0x52535452,   /* "RSTR" = 0x52535452 */
+};
+
+/*
+ * @note: Event types that are always implicitly polled:
+ * POLLERR=0x08 | POLLHUP=0x10 | POLLNVAL=0x20
+ * so bits 3,4,5 can't be used
+ */
+enum spcom_poll_events {
+	SPCOM_POLL_LINK_STATE	= BIT(1),
+	SPCOM_POLL_CH_CONNECT	= BIT(2),
+	SPCOM_POLL_READY_FLAG	= BIT(14), /* output */
+	SPCOM_POLL_WAIT_FLAG	= BIT(15), /* if set , wait for the event */
+};
+
+/* Common Command structure between User Space and spcom driver, on write() */
+struct spcom_user_command {
+	enum spcom_cmd_id cmd_id;
+	uint32_t arg;
+} __packed;
+
+/* Command structure between User Space and spcom driver, on write() */
+struct spcom_send_command {
+	enum spcom_cmd_id cmd_id;
+	uint32_t timeout_msec;
+	uint32_t buf_size;
+	char buf[0]; /* Variable buffer size - must be last field */
+} __packed;
+
+/* Command structure between userspace spcomlib and spcom driver, on write() */
+struct spcom_user_create_channel_command {
+	enum spcom_cmd_id cmd_id;
+	char ch_name[SPCOM_CHANNEL_NAME_SIZE];
+#define SPCOM_IS_SHARABLE_SUPPORTED
+	bool is_sharable;
+} __packed;
+
+/* Command structure between userspace spcomlib and spcom driver, on write() */
+#define SPCOM_USER_RESTART_SP_CMD
+struct spcom_user_restart_sp_command {
+	enum spcom_cmd_id cmd_id;
+	uint32_t arg;
+#define SPCOM_IS_UPDATED_SUPPORETED
+	uint32_t is_updated;
+} __packed;
+
+/* maximum ION buf for send-modfied-command */
+#define SPCOM_MAX_ION_BUF 4
+
+struct spcom_ion_info {
+	int32_t fd; /* ION buffer File Descriptor, set -1 for invalid fd */
+	uint32_t buf_offset; /* virtual address offset in request/response */
+};
+
+/* Pass this FD to unlock all ION buffer for the specific channel */
+#define SPCOM_ION_FD_UNLOCK_ALL	0xFFFF
+
+struct spcom_ion_handle {
+	int32_t fd;		/* File Descriptor associated with the buffer */
+};
+
+/* Command structure between User Space and spcom driver, on write() */
+struct spcom_user_send_modified_command {
+	enum spcom_cmd_id cmd_id;
+	struct spcom_ion_info ion_info[SPCOM_MAX_ION_BUF];
+	uint32_t timeout_msec;
+	uint32_t buf_size;
+	char buf[0]; /* Variable buffer size - must be last field */
+} __packed;
+
+enum {
+	SPCOM_IONFD_CMD,
+	SPCOM_POLL_CMD,
+};
+
+enum spcom_poll_cmd_id {
+	SPCOM_LINK_STATE_REQ,
+	SPCOM_CH_CONN_STATE_REQ,
+};
+
+struct spcom_poll_param {
+	/* input parameters */
+	bool wait;
+	enum spcom_poll_cmd_id cmd_id;
+	/* output parameter */
+	int retval;
+} __packed;
+
+#define SPCOM_IOCTL_MAGIC	'S'
+#define SPCOM_GET_IONFD _IOR(SPCOM_IOCTL_MAGIC, SPCOM_IONFD_CMD, \
+			     struct spcom_ion_handle)
+#define SPCOM_SET_IONFD _IOW(SPCOM_IOCTL_MAGIC, SPCOM_IONFD_CMD, \
+			     struct spcom_ion_handle)
+#define SPCOM_POLL_STATE _IOWR(SPCOM_IOCTL_MAGIC, SPCOM_POLL_CMD, \
+			       struct spcom_poll_param)
+
+#endif /* _UAPI_SPCOM_H_ */