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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * opal driver interface to hvc_console.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #undef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/hvconsole.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/firmware.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/hvsi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/udbg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/opal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include "hvc_console.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static const char hvc_opal_name[] = "hvc_opal";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static const struct of_device_id hvc_opal_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	{ .name = "serial", .compatible = "ibm,opal-console-raw" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	{ .name = "serial", .compatible = "ibm,opal-console-hvsi" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	{ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) typedef enum hv_protocol {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	HV_PROTOCOL_RAW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	HV_PROTOCOL_HVSI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) } hv_protocol_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) struct hvc_opal_priv {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	hv_protocol_t		proto;	/* Raw data or HVSI packets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	struct hvsi_priv	hvsi;	/* HVSI specific data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) /* For early boot console */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static struct hvc_opal_priv hvc_opal_boot_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static u32 hvc_opal_boot_termno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static const struct hv_ops hvc_opal_raw_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	.get_chars = opal_get_chars,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	.put_chars = opal_put_chars,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	.flush = opal_flush_chars,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	.notifier_add = notifier_add_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	.notifier_del = notifier_del_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	.notifier_hangup = notifier_hangup_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (WARN_ON(!pv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	return hvsilib_get_chars(&pv->hvsi, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (WARN_ON(!pv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	return hvsilib_put_chars(&pv->hvsi, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	pr_devel("HVSI@%x: do open !\n", hp->vtermno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	rc = notifier_add_irq(hp, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	return hvsilib_open(&pv->hvsi, hp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	pr_devel("HVSI@%x: do close !\n", hp->vtermno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	hvsilib_close(&pv->hvsi, hp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	notifier_del_irq(hp, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	hvsilib_close(&pv->hvsi, hp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	notifier_hangup_irq(hp, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (!pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	return pv->hvsi.mctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 				unsigned int clear)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		 hp->vtermno, set, clear);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (set & TIOCM_DTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		hvsilib_write_mctrl(&pv->hvsi, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	else if (clear & TIOCM_DTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		hvsilib_write_mctrl(&pv->hvsi, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static const struct hv_ops hvc_opal_hvsi_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	.get_chars = hvc_opal_hvsi_get_chars,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	.put_chars = hvc_opal_hvsi_put_chars,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	.flush = opal_flush_chars,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	.notifier_add = hvc_opal_hvsi_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	.notifier_del = hvc_opal_hvsi_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	.notifier_hangup = hvc_opal_hvsi_hangup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	.tiocmget = hvc_opal_hvsi_tiocmget,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	.tiocmset = hvc_opal_hvsi_tiocmset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static int hvc_opal_probe(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	const struct hv_ops *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	struct hvc_struct *hp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	struct hvc_opal_priv *pv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	hv_protocol_t proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	unsigned int termno, irq, boot = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	const __be32 *reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		proto = HV_PROTOCOL_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		ops = &hvc_opal_raw_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	} else if (of_device_is_compatible(dev->dev.of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 					   "ibm,opal-console-hvsi")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		proto = HV_PROTOCOL_HVSI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		ops = &hvc_opal_hvsi_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		pr_err("hvc_opal: Unknown protocol for %pOF\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		       dev->dev.of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	reg = of_get_property(dev->dev.of_node, "reg", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	termno = reg ? be32_to_cpup(reg) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	/* Is it our boot one ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		pv = hvc_opal_privs[termno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		boot = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	} else if (hvc_opal_privs[termno] == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		if (!pv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		pv->proto = proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		hvc_opal_privs[termno] = pv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		if (proto == HV_PROTOCOL_HVSI) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			 * We want put_chars to be atomic to avoid mangling of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			 * hvsi packets.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			hvsilib_init(&pv->hvsi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 				     opal_get_chars, opal_put_chars_atomic,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 				     termno, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		/* Instanciate now to establish a mapping index==vtermno */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		hvc_instantiate(termno, termno, ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		pr_err("hvc_opal: Device %pOF has duplicate terminal number #%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		       dev->dev.of_node, termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	pr_info("hvc%d: %s protocol on %pOF%s\n", termno,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		dev->dev.of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		boot ? " (boot console)" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	irq = irq_of_parse_and_map(dev->dev.of_node, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (!irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		pr_info("hvc%d: No interrupts property, using OPAL event\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 				termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	if (!irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		pr_err("hvc_opal: Unable to map interrupt for device %pOF\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 			dev->dev.of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		return irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (IS_ERR(hp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		return PTR_ERR(hp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	/* hvc consoles on powernv may need to share a single irq */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	hp->flags = IRQF_SHARED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	dev_set_drvdata(&dev->dev, hp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static int hvc_opal_remove(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	int rc, termno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	termno = hp->vtermno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	rc = hvc_remove(hp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (rc == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			kfree(hvc_opal_privs[termno]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		hvc_opal_privs[termno] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static struct platform_driver hvc_opal_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	.probe		= hvc_opal_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	.remove		= hvc_opal_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	.driver		= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		.name	= hvc_opal_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		.of_match_table	= hvc_opal_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static int __init hvc_opal_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (!firmware_has_feature(FW_FEATURE_OPAL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	/* Register as a vio device to receive callbacks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	return platform_driver_register(&hvc_opal_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) device_initcall(hvc_opal_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static void udbg_opal_putc(char c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	unsigned int termno = hvc_opal_boot_termno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	int count = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (c == '\n')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		udbg_opal_putc('\r');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		switch(hvc_opal_boot_priv.proto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		case HV_PROTOCOL_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			count = opal_put_chars(termno, &c, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		case HV_PROTOCOL_HVSI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			count = hvc_opal_hvsi_put_chars(termno, &c, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			break;
^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) 		/* This is needed for the cosole to flush
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		 * when there aren't any interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		opal_flush_console(termno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	} while(count == 0 || count == -EAGAIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static int udbg_opal_getc_poll(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	unsigned int termno = hvc_opal_boot_termno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	switch(hvc_opal_boot_priv.proto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	case HV_PROTOCOL_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		rc = opal_get_chars(termno, &c, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	case HV_PROTOCOL_HVSI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	return c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) static int udbg_opal_getc(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	int ch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		ch = udbg_opal_getc_poll();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		if (ch != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			return ch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static void udbg_init_opal_common(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	udbg_putc = udbg_opal_putc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	udbg_getc = udbg_opal_getc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	udbg_getc_poll = udbg_opal_getc_poll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) void __init hvc_opal_init_early(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	struct device_node *stdout_node = of_node_get(of_stdout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	const __be32 *termno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	const struct hv_ops *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	u32 index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	/* If the console wasn't in /chosen, try /ibm,opal */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (!stdout_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		struct device_node *opal, *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		/* Current OPAL takeover doesn't provide the stdout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		 * path, so we hard wire it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		opal = of_find_node_by_path("/ibm,opal/consoles");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		if (opal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 			pr_devel("hvc_opal: Found consoles in new location\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		if (!opal) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 			opal = of_find_node_by_path("/ibm,opal");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			if (opal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 				pr_devel("hvc_opal: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 					 "Found consoles in old location\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		if (!opal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		for_each_child_of_node(opal, np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			if (of_node_name_eq(np, "serial")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 				stdout_node = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		of_node_put(opal);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	if (!stdout_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	termno = of_get_property(stdout_node, "reg", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	index = termno ? be32_to_cpup(termno) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	if (index >= MAX_NR_HVC_CONSOLES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	hvc_opal_privs[index] = &hvc_opal_boot_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	/* Check the protocol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		ops = &hvc_opal_raw_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		pr_devel("hvc_opal: Found RAW console\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		ops = &hvc_opal_hvsi_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		hvsilib_init(&hvc_opal_boot_priv.hvsi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 			     opal_get_chars, opal_put_chars_atomic,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 			     index, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		/* HVSI, perform the handshake now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		hvsilib_establish(&hvc_opal_boot_priv.hvsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		pr_devel("hvc_opal: Found HVSI console\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	hvc_opal_boot_termno = index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	udbg_init_opal_common();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	add_preferred_console("hvc", index, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	hvc_instantiate(index, index, ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	of_node_put(stdout_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) void __init udbg_init_debug_opal_raw(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	hvc_opal_privs[index] = &hvc_opal_boot_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	hvc_opal_boot_termno = index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	udbg_init_opal_common();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) #endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) void __init udbg_init_debug_opal_hvsi(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	hvc_opal_privs[index] = &hvc_opal_boot_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	hvc_opal_boot_termno = index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	udbg_init_opal_common();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	hvsilib_init(&hvc_opal_boot_priv.hvsi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		     opal_get_chars, opal_put_chars_atomic,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 		     index, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	hvsilib_establish(&hvc_opal_boot_priv.hvsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) #endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */