HACK: Wrapper around Osmocom-BB driver for SPI and sercomm

Brings up a console and power control but has issues and should be replaced.

3 files changed, 228 insertions, 0 deletions

diff --git a/nuttx/include/sercomm/msgb.h b/nuttx/include/sercomm/msgb.h
new file mode 100644
index 0000000000..10cff9b27f
--- /dev/null
+++ b/nuttx/include/sercomm/msgb.h
@@ -0,0 +1,161 @@
+#ifndef _MSGB_H
+#define _MSGB_H
+
+/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <osmocom/core/linuxlist.h>
+#include <console.h>
+
+struct msgb {
+	struct llist_head list;
+
+	/* the layer 1 header, if any */
+	unsigned char *l1h;
+	/* the A-bis layer 2 header: OML, RSL(RLL), NS */
+	unsigned char *l2h;
+	/* the layer 3 header. For OML: FOM; RSL: 04.08; GPRS: BSSGP */
+	unsigned char *l3h;
+
+	uint16_t data_len;
+	uint16_t len;
+
+	unsigned char *head;	/* start of buffer */
+	unsigned char *tail;	/* end of message */
+	unsigned char *data;	/* start of message */
+	unsigned char _data[0];
+};
+
+extern struct msgb *msgb_alloc(uint16_t size, const char *name);
+extern void msgb_free(struct msgb *m);
+extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg);
+extern struct msgb *msgb_dequeue(struct llist_head *queue);
+extern void msgb_reset(struct msgb *m);
+
+#define msgb_l1(m)	((void *)(m->l1h))
+#define msgb_l2(m)	((void *)(m->l2h))
+#define msgb_l3(m)	((void *)(m->l3h))
+
+static inline unsigned int msgb_l1len(const struct msgb *msgb)
+{
+	return msgb->tail - (uint8_t *)msgb_l1(msgb);
+}
+
+static inline unsigned int msgb_l2len(const struct msgb *msgb)
+{
+	return msgb->tail - (uint8_t *)msgb_l2(msgb);
+}
+
+static inline unsigned int msgb_l3len(const struct msgb *msgb)
+{
+	return msgb->tail - (uint8_t *)msgb_l3(msgb);
+}
+
+static inline unsigned int msgb_headlen(const struct msgb *msgb)
+{
+	return msgb->len - msgb->data_len;
+}
+static inline int msgb_tailroom(const struct msgb *msgb)
+{
+	return (msgb->head + msgb->data_len) - msgb->tail;
+}
+static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len)
+{
+	unsigned char *tmp = msgb->tail;
+
+	/* we intentionally call cons_puts() here to display an allocation
+	 * failure on the _other_ serial port (i.e. the one that doesn't
+	 * have the HDLC layer on it */
+	if (msgb_tailroom(msgb) < len)
+		cons_puts("msgb_tailroom insufficient!\n");
+
+	msgb->tail += len;
+	msgb->len += len;
+	return tmp;
+}
+static inline void msgb_put_u8(struct msgb *msgb, uint8_t word)
+{
+	uint8_t *space = msgb_put(msgb, 1);
+	space[0] = word & 0xFF;
+}
+static inline void msgb_put_u16(struct msgb *msgb, uint16_t word)
+{
+	uint8_t *space = msgb_put(msgb, 2);
+	space[0] = word >> 8 & 0xFF;
+	space[1] = word & 0xFF;
+}
+static inline void msgb_put_u32(struct msgb *msgb, uint32_t word)
+{
+	uint8_t *space = msgb_put(msgb, 4);
+	space[0] = word >> 24 & 0xFF;
+	space[1] = word >> 16 & 0xFF;
+	space[2] = word >> 8 & 0xFF;
+	space[3] = word & 0xFF;
+}
+static inline unsigned char *msgb_get(struct msgb *msgb, unsigned int len)
+{
+	unsigned char *tmp = msgb->data;
+	msgb->data += len;
+	msgb->len -= len;
+	return tmp;
+}
+static inline uint8_t msgb_get_u8(struct msgb *msgb)
+{
+	uint8_t *space = msgb_get(msgb, 1);
+	return space[0];
+}
+static inline uint16_t msgb_get_u16(struct msgb *msgb)
+{
+	uint8_t *space = msgb_get(msgb, 2);
+	return space[0] << 8 | space[1];
+}
+static inline uint32_t msgb_get_u32(struct msgb *msgb)
+{
+	uint8_t *space = msgb_get(msgb, 4);
+	return space[0] << 24 | space[1] << 16 | space[2] << 8 | space[3];
+}
+static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int len)
+{
+	msgb->data -= len;
+	msgb->len += len;
+	return msgb->data;
+}
+static inline unsigned char *msgb_pull(struct msgb *msgb, unsigned int len)
+{
+	msgb->len -= len;
+	return msgb->data += len;
+}
+
+/* increase the headroom of an empty msgb, reducing the tailroom */
+static inline void msgb_reserve(struct msgb *msg, int len)
+{
+	msg->data += len;
+	msg->tail += len;
+}
+
+static inline struct msgb *msgb_alloc_headroom(int size, int headroom,
+						const char *name)
+{
+	struct msgb *msg = msgb_alloc(size, name);
+	if (msg)
+		msgb_reserve(msg, headroom);
+	return msg;
+}
+
+#endif /* _MSGB_H */
diff --git a/nuttx/include/sercomm/sercomm.h b/nuttx/include/sercomm/sercomm.h
new file mode 100644
index 0000000000..54256b5a7d
--- /dev/null
+++ b/nuttx/include/sercomm/sercomm.h
@@ -0,0 +1,57 @@
+#ifndef _SERCOMM_H
+#define _SERCOMM_H
+
+/* SERCOMM layer on UART1 (modem UART) */
+
+#include <osmocom/core/msgb.h>
+
+#define SERCOMM_UART_NR	1
+
+#define HDLC_FLAG	0x7E
+#define HDLC_ESCAPE	0x7D
+
+#define HDLC_C_UI	0x03
+#define HDLC_C_P_BIT	(1 << 4)
+#define HDLC_C_F_BIT	(1 << 4)
+
+/* a low sercomm_dlci means high priority.  A high DLCI means low priority */
+enum sercomm_dlci {
+	SC_DLCI_HIGHEST = 0,
+	SC_DLCI_DEBUG   = 4,
+	SC_DLCI_L1A_L23 = 5,
+	SC_DLCI_LOADER  = 9,
+	SC_DLCI_CONSOLE = 10,
+	SC_DLCI_ECHO    = 128,
+	_SC_DLCI_MAX
+};
+
+void sercomm_init(void);
+int sercomm_initialized(void);
+
+/* User Interface: Tx */
+
+/* user interface for transmitting messages for a given DLCI */
+void sercomm_sendmsg(uint8_t dlci, struct msgb *msg);
+/* how deep is the Tx queue for a given DLCI */
+unsigned int sercomm_tx_queue_depth(uint8_t dlci);
+
+/* User Interface: Rx */
+
+/* receiving messages for a given DLCI */
+typedef void (*dlci_cb_t)(uint8_t dlci, struct msgb *msg);
+int sercomm_register_rx_cb(uint8_t dlci, dlci_cb_t cb);
+
+/* Driver Interface */
+
+/* fetch one octet of to-be-transmitted serial data. returns 0 if no more data */
+int sercomm_drv_pull(uint8_t *ch);
+/* the driver has received one byte, pass it into sercomm layer.
+   returns 1 in case of success, 0 in case of unrecognized char */
+int sercomm_drv_rx_char(uint8_t ch);
+
+static inline struct msgb *sercomm_alloc_msgb(unsigned int len)
+{
+	return msgb_alloc_headroom(len+4, 4, "sercomm_tx");
+}
+
+#endif /* _SERCOMM_H */
diff --git a/nuttx/include/sercomm/sercomm_cons.h b/nuttx/include/sercomm/sercomm_cons.h
new file mode 100644
index 0000000000..11f66545c2
--- /dev/null
+++ b/nuttx/include/sercomm/sercomm_cons.h
@@ -0,0 +1,10 @@
+#ifndef _SERCOMM_CONS_H
+#define _SERCOMM_CONS_H
+
+/* how large buffers do we allocate? */
+#define SERCOMM_CONS_ALLOC	256
+
+int sercomm_puts(const char *s);
+int sercomm_putchar(int c);
+
+#endif /* _SERCOMM_CONS_H */