| /* |
| * vio driver interface to hvc_console.c |
| * |
| * This code was moved here to allow the remaining code to be reused as a |
| * generic polling mode with semi-reliable transport driver core to the |
| * console and tty subsystems. |
| * |
| * |
| * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM |
| * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM |
| * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp. |
| * Copyright (C) 2004 IBM Corporation |
| * |
| * Additional Author(s): |
| * Ryan S. Arnold <rsa@us.ibm.com> |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * TODO: |
| * |
| * - handle error in sending hvsi protocol packets |
| * - retry nego on subsequent sends ? |
| */ |
| |
| #undef DEBUG |
| |
| #include <linux/types.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/console.h> |
| |
| #include <asm/hvconsole.h> |
| #include <asm/vio.h> |
| #include <asm/prom.h> |
| #include <asm/firmware.h> |
| #include <asm/hvsi.h> |
| #include <asm/udbg.h> |
| |
| #include "hvc_console.h" |
| |
| static const char hvc_driver_name[] = "hvc_console"; |
| |
| static struct vio_device_id hvc_driver_table[] __devinitdata = { |
| {"serial", "hvterm1"}, |
| #ifndef HVC_OLD_HVSI |
| {"serial", "hvterm-protocol"}, |
| #endif |
| { "", "" } |
| }; |
| MODULE_DEVICE_TABLE(vio, hvc_driver_table); |
| |
| typedef enum hv_protocol { |
| HV_PROTOCOL_RAW, |
| HV_PROTOCOL_HVSI |
| } hv_protocol_t; |
| |
| struct hvterm_priv { |
| u32 termno; /* HV term number */ |
| hv_protocol_t proto; /* Raw data or HVSI packets */ |
| struct hvsi_priv hvsi; /* HVSI specific data */ |
| }; |
| static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES]; |
| |
| /* For early boot console */ |
| static struct hvterm_priv hvterm_priv0; |
| |
| static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count) |
| { |
| struct hvterm_priv *pv = hvterm_privs[vtermno]; |
| unsigned long got, i; |
| |
| if (WARN_ON(!pv)) |
| return 0; |
| |
| /* |
| * Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion |
| * so we play safe and avoid the situation where got > count which could |
| * overload the flip buffer. |
| */ |
| if (count < SIZE_VIO_GET_CHARS) |
| return -EAGAIN; |
| |
| got = hvc_get_chars(pv->termno, buf, count); |
| |
| /* |
| * Work around a HV bug where it gives us a null |
| * after every \r. -- paulus |
| */ |
| for (i = 1; i < got; ++i) { |
| if (buf[i] == 0 && buf[i-1] == '\r') { |
| --got; |
| if (i < got) |
| memmove(&buf[i], &buf[i+1], got - i); |
| } |
| } |
| return got; |
| } |
| |
| static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count) |
| { |
| struct hvterm_priv *pv = hvterm_privs[vtermno]; |
| |
| if (WARN_ON(!pv)) |
| return 0; |
| |
| return hvc_put_chars(pv->termno, buf, count); |
| } |
| |
| static const struct hv_ops hvterm_raw_ops = { |
| .get_chars = hvterm_raw_get_chars, |
| .put_chars = hvterm_raw_put_chars, |
| .notifier_add = notifier_add_irq, |
| .notifier_del = notifier_del_irq, |
| .notifier_hangup = notifier_hangup_irq, |
| }; |
| |
| static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count) |
| { |
| struct hvterm_priv *pv = hvterm_privs[vtermno]; |
| |
| if (WARN_ON(!pv)) |
| return 0; |
| |
| return hvsilib_get_chars(&pv->hvsi, buf, count); |
| } |
| |
| static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count) |
| { |
| struct hvterm_priv *pv = hvterm_privs[vtermno]; |
| |
| if (WARN_ON(!pv)) |
| return 0; |
| |
| return hvsilib_put_chars(&pv->hvsi, buf, count); |
| } |
| |
| static int hvterm_hvsi_open(struct hvc_struct *hp, int data) |
| { |
| struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
| int rc; |
| |
| pr_devel("HVSI@%x: open !\n", pv->termno); |
| |
| rc = notifier_add_irq(hp, data); |
| if (rc) |
| return rc; |
| |
| return hvsilib_open(&pv->hvsi, hp); |
| } |
| |
| static void hvterm_hvsi_close(struct hvc_struct *hp, int data) |
| { |
| struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
| |
| pr_devel("HVSI@%x: do close !\n", pv->termno); |
| |
| hvsilib_close(&pv->hvsi, hp); |
| |
| notifier_del_irq(hp, data); |
| } |
| |
| void hvterm_hvsi_hangup(struct hvc_struct *hp, int data) |
| { |
| struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
| |
| pr_devel("HVSI@%x: do hangup !\n", pv->termno); |
| |
| hvsilib_close(&pv->hvsi, hp); |
| |
| notifier_hangup_irq(hp, data); |
| } |
| |
| static int hvterm_hvsi_tiocmget(struct hvc_struct *hp) |
| { |
| struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
| |
| if (!pv) |
| return -EINVAL; |
| return pv->hvsi.mctrl; |
| } |
| |
| static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set, |
| unsigned int clear) |
| { |
| struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
| |
| pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n", |
| pv->termno, set, clear); |
| |
| if (set & TIOCM_DTR) |
| hvsilib_write_mctrl(&pv->hvsi, 1); |
| else if (clear & TIOCM_DTR) |
| hvsilib_write_mctrl(&pv->hvsi, 0); |
| |
| return 0; |
| } |
| |
| static const struct hv_ops hvterm_hvsi_ops = { |
| .get_chars = hvterm_hvsi_get_chars, |
| .put_chars = hvterm_hvsi_put_chars, |
| .notifier_add = hvterm_hvsi_open, |
| .notifier_del = hvterm_hvsi_close, |
| .notifier_hangup = hvterm_hvsi_hangup, |
| .tiocmget = hvterm_hvsi_tiocmget, |
| .tiocmset = hvterm_hvsi_tiocmset, |
| }; |
| |
| static int __devinit hvc_vio_probe(struct vio_dev *vdev, |
| const struct vio_device_id *id) |
| { |
| const struct hv_ops *ops; |
| struct hvc_struct *hp; |
| struct hvterm_priv *pv; |
| hv_protocol_t proto; |
| int i, termno = -1; |
| |
| /* probed with invalid parameters. */ |
| if (!vdev || !id) |
| return -EPERM; |
| |
| if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) { |
| proto = HV_PROTOCOL_RAW; |
| ops = &hvterm_raw_ops; |
| } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) { |
| proto = HV_PROTOCOL_HVSI; |
| ops = &hvterm_hvsi_ops; |
| } else { |
| pr_err("hvc_vio: Unkown protocol for %s\n", vdev->dev.of_node->full_name); |
| return -ENXIO; |
| } |
| |
| pr_devel("hvc_vio_probe() device %s, using %s protocol\n", |
| vdev->dev.of_node->full_name, |
| proto == HV_PROTOCOL_RAW ? "raw" : "hvsi"); |
| |
| /* Is it our boot one ? */ |
| if (hvterm_privs[0] == &hvterm_priv0 && |
| vdev->unit_address == hvterm_priv0.termno) { |
| pv = hvterm_privs[0]; |
| termno = 0; |
| pr_devel("->boot console, using termno 0\n"); |
| } |
| /* nope, allocate a new one */ |
| else { |
| for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++) |
| if (!hvterm_privs[i]) |
| termno = i; |
| pr_devel("->non-boot console, using termno %d\n", termno); |
| if (termno < 0) |
| return -ENODEV; |
| pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL); |
| if (!pv) |
| return -ENOMEM; |
| pv->termno = vdev->unit_address; |
| pv->proto = proto; |
| hvterm_privs[termno] = pv; |
| hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars, |
| pv->termno, 0); |
| } |
| |
| hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS); |
| if (IS_ERR(hp)) |
| return PTR_ERR(hp); |
| dev_set_drvdata(&vdev->dev, hp); |
| |
| return 0; |
| } |
| |
| static int __devexit hvc_vio_remove(struct vio_dev *vdev) |
| { |
| struct hvc_struct *hp = dev_get_drvdata(&vdev->dev); |
| int rc, termno; |
| |
| termno = hp->vtermno; |
| rc = hvc_remove(hp); |
| if (rc == 0) { |
| if (hvterm_privs[termno] != &hvterm_priv0) |
| kfree(hvterm_privs[termno]); |
| hvterm_privs[termno] = NULL; |
| } |
| return rc; |
| } |
| |
| static struct vio_driver hvc_vio_driver = { |
| .id_table = hvc_driver_table, |
| .probe = hvc_vio_probe, |
| .remove = __devexit_p(hvc_vio_remove), |
| .driver = { |
| .name = hvc_driver_name, |
| .owner = THIS_MODULE, |
| } |
| }; |
| |
| static int __init hvc_vio_init(void) |
| { |
| int rc; |
| |
| if (firmware_has_feature(FW_FEATURE_ISERIES)) |
| return -EIO; |
| |
| /* Register as a vio device to receive callbacks */ |
| rc = vio_register_driver(&hvc_vio_driver); |
| |
| return rc; |
| } |
| module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */ |
| |
| static void __exit hvc_vio_exit(void) |
| { |
| vio_unregister_driver(&hvc_vio_driver); |
| } |
| module_exit(hvc_vio_exit); |
| |
| static void udbg_hvc_putc(char c) |
| { |
| int count = -1; |
| |
| if (c == '\n') |
| udbg_hvc_putc('\r'); |
| |
| do { |
| switch(hvterm_priv0.proto) { |
| case HV_PROTOCOL_RAW: |
| count = hvterm_raw_put_chars(0, &c, 1); |
| break; |
| case HV_PROTOCOL_HVSI: |
| count = hvterm_hvsi_put_chars(0, &c, 1); |
| break; |
| } |
| } while(count == 0); |
| } |
| |
| static int udbg_hvc_getc_poll(void) |
| { |
| int rc = 0; |
| char c; |
| |
| switch(hvterm_priv0.proto) { |
| case HV_PROTOCOL_RAW: |
| rc = hvterm_raw_get_chars(0, &c, 1); |
| break; |
| case HV_PROTOCOL_HVSI: |
| rc = hvterm_hvsi_get_chars(0, &c, 1); |
| break; |
| } |
| if (!rc) |
| return -1; |
| return c; |
| } |
| |
| static int udbg_hvc_getc(void) |
| { |
| int ch; |
| for (;;) { |
| ch = udbg_hvc_getc_poll(); |
| if (ch == -1) { |
| /* This shouldn't be needed...but... */ |
| volatile unsigned long delay; |
| for (delay=0; delay < 2000000; delay++) |
| ; |
| } else { |
| return ch; |
| } |
| } |
| } |
| |
| void __init hvc_vio_init_early(void) |
| { |
| struct device_node *stdout_node; |
| const u32 *termno; |
| const char *name; |
| const struct hv_ops *ops; |
| |
| /* find the boot console from /chosen/stdout */ |
| if (!of_chosen) |
| return; |
| name = of_get_property(of_chosen, "linux,stdout-path", NULL); |
| if (name == NULL) |
| return; |
| stdout_node = of_find_node_by_path(name); |
| if (!stdout_node) |
| return; |
| name = of_get_property(stdout_node, "name", NULL); |
| if (!name) { |
| printk(KERN_WARNING "stdout node missing 'name' property!\n"); |
| goto out; |
| } |
| |
| /* Check if it's a virtual terminal */ |
| if (strncmp(name, "vty", 3) != 0) |
| goto out; |
| termno = of_get_property(stdout_node, "reg", NULL); |
| if (termno == NULL) |
| goto out; |
| hvterm_priv0.termno = *termno; |
| hvterm_privs[0] = &hvterm_priv0; |
| |
| /* Check the protocol */ |
| if (of_device_is_compatible(stdout_node, "hvterm1")) { |
| hvterm_priv0.proto = HV_PROTOCOL_RAW; |
| ops = &hvterm_raw_ops; |
| } |
| else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) { |
| hvterm_priv0.proto = HV_PROTOCOL_HVSI; |
| ops = &hvterm_hvsi_ops; |
| hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars, |
| hvterm_priv0.termno, 1); |
| /* HVSI, perform the handshake now */ |
| hvsilib_establish(&hvterm_priv0.hvsi); |
| } else |
| goto out; |
| udbg_putc = udbg_hvc_putc; |
| udbg_getc = udbg_hvc_getc; |
| udbg_getc_poll = udbg_hvc_getc_poll; |
| #ifdef HVC_OLD_HVSI |
| /* When using the old HVSI driver don't register the HVC |
| * backend for HVSI, only do udbg |
| */ |
| if (hvterm_priv0.proto == HV_PROTOCOL_HVSI) |
| goto out; |
| #endif |
| add_preferred_console("hvc", 0, NULL); |
| hvc_instantiate(0, 0, ops); |
| out: |
| of_node_put(stdout_node); |
| } |
| |
| /* call this from early_init() for a working debug console on |
| * vterm capable LPAR machines |
| */ |
| #ifdef CONFIG_PPC_EARLY_DEBUG_LPAR |
| void __init udbg_init_debug_lpar(void) |
| { |
| hvterm_privs[0] = &hvterm_priv0; |
| hvterm_priv0.termno = 0; |
| hvterm_priv0.proto = HV_PROTOCOL_RAW; |
| udbg_putc = udbg_hvc_putc; |
| udbg_getc = udbg_hvc_getc; |
| udbg_getc_poll = udbg_hvc_getc_poll; |
| } |
| #endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */ |
| |
| #ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI |
| void __init udbg_init_debug_lpar_hvsi(void) |
| { |
| hvterm_privs[0] = &hvterm_priv0; |
| hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO; |
| hvterm_priv0.proto = HV_PROTOCOL_HVSI; |
| udbg_putc = udbg_hvc_putc; |
| udbg_getc = udbg_hvc_getc; |
| udbg_getc_poll = udbg_hvc_getc_poll; |
| hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars, |
| hvterm_priv0.termno, 1); |
| hvsilib_establish(&hvterm_priv0.hvsi); |
| } |
| #endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */ |