Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <asm/hvsi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "hvc_console.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) static int hvsi_send_packet(struct hvsi_priv *pv, struct hvsi_header *packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 	packet->seqno = cpu_to_be16(atomic_inc_return(&pv->seqno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 	/* Assumes that always succeeds, works in practice */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	return pv->put_chars(pv->termno, (char *)packet, packet->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) static void hvsi_start_handshake(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	struct hvsi_query q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	/* Reset state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	pv->established = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	atomic_set(&pv->seqno, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	pr_devel("HVSI@%x: Handshaking started\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	/* Send version query */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	q.hdr.type = VS_QUERY_PACKET_HEADER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	q.hdr.len = sizeof(struct hvsi_query);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	q.verb = cpu_to_be16(VSV_SEND_VERSION_NUMBER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	hvsi_send_packet(pv, &q.hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static int hvsi_send_close(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct hvsi_control ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	pv->established = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	ctrl.hdr.type = VS_CONTROL_PACKET_HEADER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	ctrl.hdr.len = sizeof(struct hvsi_control);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	ctrl.verb = cpu_to_be16(VSV_CLOSE_PROTOCOL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	return hvsi_send_packet(pv, &ctrl.hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static void hvsi_cd_change(struct hvsi_priv *pv, int cd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (cd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		pv->mctrl |= TIOCM_CD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		pv->mctrl &= ~TIOCM_CD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		/* We copy the existing hvsi driver semantics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		 * here which are to trigger a hangup when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		 * we get a carrier loss.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		 * Closing our connection to the server will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		 * do just that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		if (!pv->is_console && pv->opened) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			pr_devel("HVSI@%x Carrier lost, hanging up !\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 				 pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			hvsi_send_close(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static void hvsi_got_control(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct hvsi_control *pkt = (struct hvsi_control *)pv->inbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	switch (be16_to_cpu(pkt->verb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	case VSV_CLOSE_PROTOCOL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		/* We restart the handshaking */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		hvsi_start_handshake(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	case VSV_MODEM_CTL_UPDATE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		/* Transition of carrier detect */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		hvsi_cd_change(pv, be32_to_cpu(pkt->word) & HVSI_TSCD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static void hvsi_got_query(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct hvsi_query *pkt = (struct hvsi_query *)pv->inbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	struct hvsi_query_response r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	/* We only handle version queries */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (be16_to_cpu(pkt->verb) != VSV_SEND_VERSION_NUMBER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	pr_devel("HVSI@%x: Got version query, sending response...\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		 pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	/* Send version response */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	r.hdr.type = VS_QUERY_RESPONSE_PACKET_HEADER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	r.hdr.len = sizeof(struct hvsi_query_response);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	r.verb = cpu_to_be16(VSV_SEND_VERSION_NUMBER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	r.u.version = HVSI_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	r.query_seqno = pkt->hdr.seqno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	hvsi_send_packet(pv, &r.hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	/* Assume protocol is open now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	pv->established = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static void hvsi_got_response(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	struct hvsi_query_response *r =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		(struct hvsi_query_response *)pv->inbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	switch(r->verb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	case VSV_SEND_MODEM_CTL_STATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		hvsi_cd_change(pv, be32_to_cpu(r->u.mctrl_word) & HVSI_TSCD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		pv->mctrl_update = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static int hvsi_check_packet(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	u8 len, type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	/* Check header validity. If it's invalid, we ditch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	 * the whole buffer and hope we eventually resync
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (pv->inbuf[0] < 0xfc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		pv->inbuf_len = pv->inbuf_pktlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	type = pv->inbuf[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	len = pv->inbuf[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	/* Packet incomplete ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	if (pv->inbuf_len < len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	pr_devel("HVSI@%x: Got packet type %x len %d bytes:\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		 pv->termno, type, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	/* We have a packet, yay ! Handle it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	switch(type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	case VS_DATA_PACKET_HEADER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		pv->inbuf_pktlen = len - 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		pv->inbuf_cur = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	case VS_CONTROL_PACKET_HEADER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		hvsi_got_control(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	case VS_QUERY_PACKET_HEADER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		hvsi_got_query(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	case VS_QUERY_RESPONSE_PACKET_HEADER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		hvsi_got_response(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	/* Swallow packet and retry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	pv->inbuf_len -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	memmove(pv->inbuf, &pv->inbuf[len], pv->inbuf_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static int hvsi_get_packet(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	/* If we have room in the buffer, ask HV for more */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (pv->inbuf_len < HVSI_INBUF_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		pv->inbuf_len += pv->get_chars(pv->termno,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 					     &pv->inbuf[pv->inbuf_len],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 					     HVSI_INBUF_SIZE - pv->inbuf_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	 * If we have at least 4 bytes in the buffer, check for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	 * a full packet and retry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (pv->inbuf_len >= 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		return hvsi_check_packet(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) int hvsilib_get_chars(struct hvsi_priv *pv, char *buf, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	unsigned int tries, read = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (WARN_ON(!pv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	/* If we aren't open, don't do anything in order to avoid races
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	 * with connection establishment. The hvc core will call this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	 * before we have returned from notifier_add(), and we need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	 * avoid multiple users playing with the receive buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (!pv->opened)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	/* We try twice, once with what data we have and once more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	 * after we try to fetch some more from the hypervisor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	for (tries = 1; count && tries < 2; tries++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		/* Consume existing data packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		if (pv->inbuf_pktlen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			unsigned int l = min(count, (int)pv->inbuf_pktlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			memcpy(&buf[read], &pv->inbuf[pv->inbuf_cur], l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			pv->inbuf_cur += l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			pv->inbuf_pktlen -= l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			count -= l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			read += l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		/* Data packet fully consumed, move down remaning data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		if (pv->inbuf_cur) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			pv->inbuf_len -= pv->inbuf_cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			memmove(pv->inbuf, &pv->inbuf[pv->inbuf_cur],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 				pv->inbuf_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			pv->inbuf_cur = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		/* Try to get another packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		if (hvsi_get_packet(pv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			tries--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (!pv->established) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		pr_devel("HVSI@%x: returning -EPIPE\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		return -EPIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	return read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) int hvsilib_put_chars(struct hvsi_priv *pv, const char *buf, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	struct hvsi_data dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	int rc, adjcount = min(count, HVSI_MAX_OUTGOING_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if (WARN_ON(!pv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	dp.hdr.type = VS_DATA_PACKET_HEADER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	dp.hdr.len = adjcount + sizeof(struct hvsi_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	memcpy(dp.data, buf, adjcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	rc = hvsi_send_packet(pv, &dp.hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (rc <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	return adjcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static void maybe_msleep(unsigned long ms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	/* During early boot, IRQs are disabled, use mdelay */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (irqs_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		mdelay(ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		msleep(ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) int hvsilib_read_mctrl(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	struct hvsi_query q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	int rc, timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	pr_devel("HVSI@%x: Querying modem control status...\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		 pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	pv->mctrl_update = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	q.hdr.type = VS_QUERY_PACKET_HEADER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	q.hdr.len = sizeof(struct hvsi_query);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	q.verb = cpu_to_be16(VSV_SEND_MODEM_CTL_STATUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	rc = hvsi_send_packet(pv, &q.hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		pr_devel("HVSI@%x: Error %d...\n", pv->termno, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	/* Try for up to 200ms */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	for (timeout = 0; timeout < 20; timeout++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		if (!pv->established)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		if (pv->mctrl_update)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		if (!hvsi_get_packet(pv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			maybe_msleep(10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) int hvsilib_write_mctrl(struct hvsi_priv *pv, int dtr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	struct hvsi_control ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	unsigned short mctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	mctrl = pv->mctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (dtr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		mctrl |= TIOCM_DTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		mctrl &= ~TIOCM_DTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (mctrl == pv->mctrl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	pv->mctrl = mctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	pr_devel("HVSI@%x: %s DTR...\n", pv->termno,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		 dtr ? "Setting" : "Clearing");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	ctrl.hdr.type = VS_CONTROL_PACKET_HEADER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	ctrl.hdr.len = sizeof(struct hvsi_control);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	ctrl.verb = cpu_to_be16(VSV_SET_MODEM_CTL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	ctrl.mask = cpu_to_be32(HVSI_TSDTR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	ctrl.word = cpu_to_be32(dtr ? HVSI_TSDTR : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	return hvsi_send_packet(pv, &ctrl.hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) void hvsilib_establish(struct hvsi_priv *pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	int timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	pr_devel("HVSI@%x: Establishing...\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	/* Try for up to 200ms, there can be a packet to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	 * start the process waiting for us...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	for (timeout = 0; timeout < 20; timeout++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		if (pv->established)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			goto established;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		if (!hvsi_get_packet(pv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			maybe_msleep(10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	/* Failed, send a close connection packet just
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	 * in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	pr_devel("HVSI@%x:   ... sending close\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	hvsi_send_close(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	/* Then restart handshake */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	pr_devel("HVSI@%x:   ... restarting handshake\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	hvsi_start_handshake(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	pr_devel("HVSI@%x:   ... waiting handshake\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	/* Try for up to 400ms */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	for (timeout = 0; timeout < 40; timeout++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		if (pv->established)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 			goto established;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		if (!hvsi_get_packet(pv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 			maybe_msleep(10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	if (!pv->established) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		pr_devel("HVSI@%x: Timeout handshaking, giving up !\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 			 pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)  established:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	/* Query modem control lines */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	pr_devel("HVSI@%x:   ... established, reading mctrl\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	hvsilib_read_mctrl(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	/* Set our own DTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	pr_devel("HVSI@%x:   ... setting mctrl\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	hvsilib_write_mctrl(pv, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	/* Set the opened flag so reads are allowed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	pv->opened = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) int hvsilib_open(struct hvsi_priv *pv, struct hvc_struct *hp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	pr_devel("HVSI@%x: open !\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	/* Keep track of the tty data structure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	pv->tty = tty_port_tty_get(&hp->port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	hvsilib_establish(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) void hvsilib_close(struct hvsi_priv *pv, struct hvc_struct *hp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	pr_devel("HVSI@%x: close !\n", pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	if (!pv->is_console) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 		pr_devel("HVSI@%x: Not a console, tearing down\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 			 pv->termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 		/* Clear opened, synchronize with khvcd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		spin_lock_irqsave(&hp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		pv->opened = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		spin_unlock_irqrestore(&hp->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		/* Clear our own DTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		if (!pv->tty || (pv->tty->termios.c_cflag & HUPCL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 			hvsilib_write_mctrl(pv, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 		/* Tear down the connection */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 		hvsi_send_close(pv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	tty_kref_put(pv->tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	pv->tty = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) void hvsilib_init(struct hvsi_priv *pv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		  int (*get_chars)(uint32_t termno, char *buf, int count),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		  int (*put_chars)(uint32_t termno, const char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 				   int count),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		  int termno, int is_console)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	memset(pv, 0, sizeof(*pv));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	pv->get_chars = get_chars;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	pv->put_chars = put_chars;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	pv->termno = termno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	pv->is_console = is_console;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) }