[RFC,06/18] net: iosm: channel configuration

diff --git a/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c b/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c
new file mode 100644
index 000000000000..d1d239218494
--- /dev/null
+++ b/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c
@@ -0,0 +1,87 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Intel Corporation.
+ */
+
+#include "iosm_ipc_chnl_cfg.h"
+
+/* Max. sizes of a downlink buffers */
+#define IPC_MEM_MAX_DL_FLASH_BUF_SIZE (16 * 1024)
+#define IPC_MEM_MAX_DL_LOOPBACK_SIZE (1 * 1024 * 1024)
+#define IPC_MEM_MAX_DL_AT_BUF_SIZE 2048
+#define IPC_MEM_MAX_DL_RPC_BUF_SIZE (32 * 1024)
+#define IPC_MEM_MAX_DL_MBIM_BUF_SIZE IPC_MEM_MAX_DL_RPC_BUF_SIZE
+
+/* Max. transfer descriptors for a pipe. */
+#define IPC_MEM_MAX_TDS_FLASH_DL 3
+#define IPC_MEM_MAX_TDS_FLASH_UL 6
+#define IPC_MEM_MAX_TDS_AT 4
+#define IPC_MEM_MAX_TDS_RPC 4
+#define IPC_MEM_MAX_TDS_MBIM IPC_MEM_MAX_TDS_RPC
+#define IPC_MEM_MAX_TDS_LOOPBACK 11
+
+/* Accumulation backoff usec */
+#define IRQ_ACC_BACKOFF_OFF 0
+
+/* MUX acc backoff 1ms */
+#define IRQ_ACC_BACKOFF_MUX 1000
+
+/* Modem channel configuration table
+ * Always reserve element zero for flash channel.
+ */
+static struct ipc_chnl_cfg modem_cfg[] = {
+	/* FLASH Channel */
+	{ IPC_MEM_FLASH_CH_ID, IPC_MEM_PIPE_0, IPC_MEM_PIPE_1,
+	  IPC_MEM_MAX_TDS_FLASH_UL, IPC_MEM_MAX_TDS_FLASH_DL,
+	  IPC_MEM_MAX_DL_FLASH_BUF_SIZE },
+	/* MBIM Channel */
+	{ IPC_MEM_MBIM_CTRL_CH_ID, IPC_MEM_PIPE_12, IPC_MEM_PIPE_13,
+	  IPC_MEM_MAX_TDS_MBIM, IPC_MEM_MAX_TDS_MBIM,
+	  IPC_MEM_MAX_DL_MBIM_BUF_SIZE },
+	/* RPC - 0 */
+	{ IPC_WWAN_DSS_ID_0, IPC_MEM_PIPE_2, IPC_MEM_PIPE_3,
+	  IPC_MEM_MAX_TDS_RPC, IPC_MEM_MAX_TDS_RPC,
+	  IPC_MEM_MAX_DL_RPC_BUF_SIZE },
+	/* IAT0 */
+	{ IPC_WWAN_DSS_ID_1, IPC_MEM_PIPE_4, IPC_MEM_PIPE_5, IPC_MEM_MAX_TDS_AT,
+	  IPC_MEM_MAX_TDS_AT, IPC_MEM_MAX_DL_AT_BUF_SIZE },
+	/* IAT1 */
+	{ IPC_WWAN_DSS_ID_2, IPC_MEM_PIPE_8, IPC_MEM_PIPE_9, IPC_MEM_MAX_TDS_AT,
+	  IPC_MEM_MAX_TDS_AT, IPC_MEM_MAX_DL_AT_BUF_SIZE },
+	/* Loopback */
+	{ IPC_WWAN_DSS_ID_3, IPC_MEM_PIPE_10, IPC_MEM_PIPE_11,
+	  IPC_MEM_MAX_TDS_LOOPBACK, IPC_MEM_MAX_TDS_LOOPBACK,
+	  IPC_MEM_MAX_DL_LOOPBACK_SIZE },
+	/* Trace */
+	{ IPC_WWAN_DSS_ID_4, IPC_MEM_PIPE_6, IPC_MEM_PIPE_7, IPC_MEM_TDS_TRC,
+	  IPC_MEM_TDS_TRC, IPC_MEM_MAX_DL_TRC_BUF_SIZE },
+	/* IP Mux */
+	{ IPC_MEM_MUX_IP_CH_VLAN_ID, IPC_MEM_PIPE_0, IPC_MEM_PIPE_1,
+	  IPC_MEM_MAX_TDS_MUX_LITE_UL, IPC_MEM_MAX_TDS_MUX_LITE_DL,
+	  IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE },
+};
+
+int ipc_chnl_cfg_get(struct ipc_chnl_cfg *chnl_cfg, int index,
+		     enum ipc_mux_protocol mux_protocol)
+{
+	int array_size = ARRAY_SIZE(modem_cfg);
+
+	if (index >= array_size) {
+		pr_err("index: %d and array_size %d", index, array_size);
+		return -1;
+	}
+
+	if (index == IPC_MEM_MUX_IP_CH_VLAN_ID)
+		chnl_cfg->accumulation_backoff = IRQ_ACC_BACKOFF_MUX;
+	else
+		chnl_cfg->accumulation_backoff = IRQ_ACC_BACKOFF_OFF;
+
+	chnl_cfg->ul_nr_of_entries = modem_cfg[index].ul_nr_of_entries;
+	chnl_cfg->dl_nr_of_entries = modem_cfg[index].dl_nr_of_entries;
+	chnl_cfg->dl_buf_size = modem_cfg[index].dl_buf_size;
+	chnl_cfg->id = modem_cfg[index].id;
+	chnl_cfg->ul_pipe = modem_cfg[index].ul_pipe;
+	chnl_cfg->dl_pipe = modem_cfg[index].dl_pipe;
+
+	return 0;
+}
diff --git a/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.h b/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.h
new file mode 100644
index 000000000000..42ba4e4849bb
--- /dev/null
+++ b/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.h
@@ -0,0 +1,57 @@ 
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (C) 2020 Intel Corporation
+ */
+
+#ifndef IOSM_IPC_CHNL_CFG_H
+#define IOSM_IPC_CHNL_CFG_H
+
+#include "iosm_ipc_mux.h"
+
+/* Number of TDs on the trace channel */
+#define IPC_MEM_TDS_TRC 32
+
+/* Trace channel TD buffer size. */
+#define IPC_MEM_MAX_DL_TRC_BUF_SIZE 8192
+
+/* Type of the WWAN ID */
+enum ipc_wwan_id {
+	IPC_WWAN_DSS_ID_0 = 257,
+	IPC_WWAN_DSS_ID_1,
+	IPC_WWAN_DSS_ID_2,
+	IPC_WWAN_DSS_ID_3,
+	IPC_WWAN_DSS_ID_4,
+};
+
+/**
+ * struct ipc_chnl_cfg - IPC channel configuration structure
+ * @id:				VLAN ID
+ * @ul_pipe:			Uplink datastream
+ * @dl_pipe:			Downlink datastream
+ * @ul_nr_of_entries:		Number of Transfer descriptor uplink pipe
+ * @dl_nr_of_entries:		Number of Transfer descriptor downlink pipe
+ * @dl_buf_size:		Downlink buffer size
+ * @accumulation_backoff:	Time in usec for data accumalation
+ */
+struct ipc_chnl_cfg {
+	int id;
+	u32 ul_pipe;
+	u32 dl_pipe;
+	u32 ul_nr_of_entries;
+	u32 dl_nr_of_entries;
+	u32 dl_buf_size;
+	u32 accumulation_backoff;
+};
+
+/**
+ * ipc_chnl_cfg_get - Get pipe configuration.
+ * @chnl_cfg:		Array of ipc_chnl_cfg struct
+ * @index:		Channel index (upto MAX_CHANNELS)
+ * @mux_protocol:	Active mux protocol
+ *
+ * Return: 0 on success and -1 on failure
+ */
+int ipc_chnl_cfg_get(struct ipc_chnl_cfg *chnl_cfg, int index,
+		     enum ipc_mux_protocol mux_protocol);
+
+#endif