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419 lines
10 KiB
419 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* opal driver interface to hvc_console.c |
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* |
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* Copyright 2011 Benjamin Herrenschmidt <[email protected]>, IBM Corp. |
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*/ |
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#undef DEBUG |
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/console.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/export.h> |
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#include <linux/interrupt.h> |
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#include <asm/hvconsole.h> |
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#include <asm/prom.h> |
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#include <asm/firmware.h> |
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#include <asm/hvsi.h> |
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#include <asm/udbg.h> |
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#include <asm/opal.h> |
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#include "hvc_console.h" |
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static const char hvc_opal_name[] = "hvc_opal"; |
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static const struct of_device_id hvc_opal_match[] = { |
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{ .name = "serial", .compatible = "ibm,opal-console-raw" }, |
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{ .name = "serial", .compatible = "ibm,opal-console-hvsi" }, |
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{ }, |
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}; |
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typedef enum hv_protocol { |
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HV_PROTOCOL_RAW, |
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HV_PROTOCOL_HVSI |
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} hv_protocol_t; |
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struct hvc_opal_priv { |
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hv_protocol_t proto; /* Raw data or HVSI packets */ |
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struct hvsi_priv hvsi; /* HVSI specific data */ |
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}; |
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static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES]; |
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/* For early boot console */ |
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static struct hvc_opal_priv hvc_opal_boot_priv; |
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static u32 hvc_opal_boot_termno; |
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static const struct hv_ops hvc_opal_raw_ops = { |
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.get_chars = opal_get_chars, |
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.put_chars = opal_put_chars, |
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.flush = opal_flush_chars, |
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.notifier_add = notifier_add_irq, |
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.notifier_del = notifier_del_irq, |
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.notifier_hangup = notifier_hangup_irq, |
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}; |
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static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count) |
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{ |
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struct hvc_opal_priv *pv = hvc_opal_privs[vtermno]; |
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if (WARN_ON(!pv)) |
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return -ENODEV; |
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return hvsilib_get_chars(&pv->hvsi, buf, count); |
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} |
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static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count) |
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{ |
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struct hvc_opal_priv *pv = hvc_opal_privs[vtermno]; |
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if (WARN_ON(!pv)) |
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return -ENODEV; |
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return hvsilib_put_chars(&pv->hvsi, buf, count); |
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} |
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static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data) |
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{ |
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struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; |
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int rc; |
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pr_devel("HVSI@%x: do open !\n", hp->vtermno); |
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rc = notifier_add_irq(hp, data); |
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if (rc) |
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return rc; |
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return hvsilib_open(&pv->hvsi, hp); |
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} |
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static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data) |
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{ |
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struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; |
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pr_devel("HVSI@%x: do close !\n", hp->vtermno); |
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hvsilib_close(&pv->hvsi, hp); |
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notifier_del_irq(hp, data); |
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} |
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static void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data) |
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{ |
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struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; |
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pr_devel("HVSI@%x: do hangup !\n", hp->vtermno); |
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hvsilib_close(&pv->hvsi, hp); |
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notifier_hangup_irq(hp, data); |
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} |
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static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp) |
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{ |
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struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; |
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if (!pv) |
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return -EINVAL; |
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return pv->hvsi.mctrl; |
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} |
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static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set, |
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unsigned int clear) |
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{ |
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struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno]; |
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pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n", |
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hp->vtermno, set, clear); |
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if (set & TIOCM_DTR) |
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hvsilib_write_mctrl(&pv->hvsi, 1); |
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else if (clear & TIOCM_DTR) |
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hvsilib_write_mctrl(&pv->hvsi, 0); |
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return 0; |
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} |
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static const struct hv_ops hvc_opal_hvsi_ops = { |
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.get_chars = hvc_opal_hvsi_get_chars, |
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.put_chars = hvc_opal_hvsi_put_chars, |
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.flush = opal_flush_chars, |
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.notifier_add = hvc_opal_hvsi_open, |
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.notifier_del = hvc_opal_hvsi_close, |
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.notifier_hangup = hvc_opal_hvsi_hangup, |
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.tiocmget = hvc_opal_hvsi_tiocmget, |
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.tiocmset = hvc_opal_hvsi_tiocmset, |
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}; |
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static int hvc_opal_probe(struct platform_device *dev) |
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{ |
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const struct hv_ops *ops; |
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struct hvc_struct *hp; |
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struct hvc_opal_priv *pv; |
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hv_protocol_t proto; |
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unsigned int termno, irq, boot = 0; |
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const __be32 *reg; |
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if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) { |
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proto = HV_PROTOCOL_RAW; |
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ops = &hvc_opal_raw_ops; |
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} else if (of_device_is_compatible(dev->dev.of_node, |
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"ibm,opal-console-hvsi")) { |
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proto = HV_PROTOCOL_HVSI; |
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ops = &hvc_opal_hvsi_ops; |
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} else { |
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pr_err("hvc_opal: Unknown protocol for %pOF\n", |
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dev->dev.of_node); |
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return -ENXIO; |
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} |
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reg = of_get_property(dev->dev.of_node, "reg", NULL); |
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termno = reg ? be32_to_cpup(reg) : 0; |
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/* Is it our boot one ? */ |
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if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) { |
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pv = hvc_opal_privs[termno]; |
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boot = 1; |
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} else if (hvc_opal_privs[termno] == NULL) { |
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pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL); |
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if (!pv) |
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return -ENOMEM; |
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pv->proto = proto; |
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hvc_opal_privs[termno] = pv; |
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if (proto == HV_PROTOCOL_HVSI) { |
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/* |
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* We want put_chars to be atomic to avoid mangling of |
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* hvsi packets. |
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*/ |
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hvsilib_init(&pv->hvsi, |
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opal_get_chars, opal_put_chars_atomic, |
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termno, 0); |
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} |
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/* Instanciate now to establish a mapping index==vtermno */ |
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hvc_instantiate(termno, termno, ops); |
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} else { |
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pr_err("hvc_opal: Device %pOF has duplicate terminal number #%d\n", |
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dev->dev.of_node, termno); |
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return -ENXIO; |
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} |
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pr_info("hvc%d: %s protocol on %pOF%s\n", termno, |
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proto == HV_PROTOCOL_RAW ? "raw" : "hvsi", |
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dev->dev.of_node, |
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boot ? " (boot console)" : ""); |
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irq = irq_of_parse_and_map(dev->dev.of_node, 0); |
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if (!irq) { |
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pr_info("hvc%d: No interrupts property, using OPAL event\n", |
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termno); |
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irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT)); |
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} |
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if (!irq) { |
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pr_err("hvc_opal: Unable to map interrupt for device %pOF\n", |
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dev->dev.of_node); |
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return irq; |
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} |
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hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS); |
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if (IS_ERR(hp)) |
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return PTR_ERR(hp); |
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/* hvc consoles on powernv may need to share a single irq */ |
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hp->flags = IRQF_SHARED; |
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dev_set_drvdata(&dev->dev, hp); |
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return 0; |
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} |
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static int hvc_opal_remove(struct platform_device *dev) |
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{ |
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struct hvc_struct *hp = dev_get_drvdata(&dev->dev); |
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int rc, termno; |
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termno = hp->vtermno; |
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rc = hvc_remove(hp); |
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if (rc == 0) { |
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if (hvc_opal_privs[termno] != &hvc_opal_boot_priv) |
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kfree(hvc_opal_privs[termno]); |
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hvc_opal_privs[termno] = NULL; |
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} |
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return rc; |
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} |
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static struct platform_driver hvc_opal_driver = { |
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.probe = hvc_opal_probe, |
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.remove = hvc_opal_remove, |
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.driver = { |
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.name = hvc_opal_name, |
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.of_match_table = hvc_opal_match, |
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} |
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}; |
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static int __init hvc_opal_init(void) |
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{ |
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if (!firmware_has_feature(FW_FEATURE_OPAL)) |
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return -ENODEV; |
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/* Register as a vio device to receive callbacks */ |
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return platform_driver_register(&hvc_opal_driver); |
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} |
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device_initcall(hvc_opal_init); |
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static void udbg_opal_putc(char c) |
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{ |
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unsigned int termno = hvc_opal_boot_termno; |
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int count = -1; |
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if (c == '\n') |
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udbg_opal_putc('\r'); |
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do { |
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switch(hvc_opal_boot_priv.proto) { |
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case HV_PROTOCOL_RAW: |
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count = opal_put_chars(termno, &c, 1); |
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break; |
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case HV_PROTOCOL_HVSI: |
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count = hvc_opal_hvsi_put_chars(termno, &c, 1); |
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break; |
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} |
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/* This is needed for the cosole to flush |
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* when there aren't any interrupts. |
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*/ |
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opal_flush_console(termno); |
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} while(count == 0 || count == -EAGAIN); |
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} |
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static int udbg_opal_getc_poll(void) |
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{ |
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unsigned int termno = hvc_opal_boot_termno; |
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int rc = 0; |
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char c; |
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switch(hvc_opal_boot_priv.proto) { |
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case HV_PROTOCOL_RAW: |
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rc = opal_get_chars(termno, &c, 1); |
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break; |
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case HV_PROTOCOL_HVSI: |
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rc = hvc_opal_hvsi_get_chars(termno, &c, 1); |
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break; |
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} |
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if (!rc) |
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return -1; |
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return c; |
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} |
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static int udbg_opal_getc(void) |
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{ |
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int ch; |
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for (;;) { |
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ch = udbg_opal_getc_poll(); |
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if (ch != -1) |
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return ch; |
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} |
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} |
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static void udbg_init_opal_common(void) |
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{ |
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udbg_putc = udbg_opal_putc; |
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udbg_getc = udbg_opal_getc; |
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udbg_getc_poll = udbg_opal_getc_poll; |
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} |
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void __init hvc_opal_init_early(void) |
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{ |
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struct device_node *stdout_node = of_node_get(of_stdout); |
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const __be32 *termno; |
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const struct hv_ops *ops; |
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u32 index; |
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/* If the console wasn't in /chosen, try /ibm,opal */ |
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if (!stdout_node) { |
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struct device_node *opal, *np; |
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/* Current OPAL takeover doesn't provide the stdout |
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* path, so we hard wire it |
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*/ |
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opal = of_find_node_by_path("/ibm,opal/consoles"); |
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if (opal) |
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pr_devel("hvc_opal: Found consoles in new location\n"); |
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if (!opal) { |
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opal = of_find_node_by_path("/ibm,opal"); |
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if (opal) |
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pr_devel("hvc_opal: " |
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"Found consoles in old location\n"); |
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} |
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if (!opal) |
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return; |
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for_each_child_of_node(opal, np) { |
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if (of_node_name_eq(np, "serial")) { |
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stdout_node = np; |
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break; |
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} |
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} |
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of_node_put(opal); |
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} |
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if (!stdout_node) |
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return; |
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termno = of_get_property(stdout_node, "reg", NULL); |
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index = termno ? be32_to_cpup(termno) : 0; |
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if (index >= MAX_NR_HVC_CONSOLES) |
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return; |
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hvc_opal_privs[index] = &hvc_opal_boot_priv; |
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/* Check the protocol */ |
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if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) { |
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hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW; |
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ops = &hvc_opal_raw_ops; |
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pr_devel("hvc_opal: Found RAW console\n"); |
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} |
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else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) { |
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hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI; |
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ops = &hvc_opal_hvsi_ops; |
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hvsilib_init(&hvc_opal_boot_priv.hvsi, |
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opal_get_chars, opal_put_chars_atomic, |
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index, 1); |
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/* HVSI, perform the handshake now */ |
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hvsilib_establish(&hvc_opal_boot_priv.hvsi); |
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pr_devel("hvc_opal: Found HVSI console\n"); |
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} else |
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goto out; |
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hvc_opal_boot_termno = index; |
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udbg_init_opal_common(); |
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add_preferred_console("hvc", index, NULL); |
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hvc_instantiate(index, index, ops); |
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out: |
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of_node_put(stdout_node); |
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} |
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#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW |
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void __init udbg_init_debug_opal_raw(void) |
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{ |
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u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO; |
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hvc_opal_privs[index] = &hvc_opal_boot_priv; |
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hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW; |
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hvc_opal_boot_termno = index; |
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udbg_init_opal_common(); |
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} |
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#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */ |
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#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI |
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void __init udbg_init_debug_opal_hvsi(void) |
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{ |
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u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO; |
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hvc_opal_privs[index] = &hvc_opal_boot_priv; |
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hvc_opal_boot_termno = index; |
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udbg_init_opal_common(); |
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hvsilib_init(&hvc_opal_boot_priv.hvsi, |
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opal_get_chars, opal_put_chars_atomic, |
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index, 1); |
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hvsilib_establish(&hvc_opal_boot_priv.hvsi); |
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} |
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#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */
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