tty: Update hypervisor tty drivers to use core stdout parsing code.
The evh_bytechan, hvc_opal and hvc_vio drivers all open code the parsing of the stdout node in the device tree. This patch simplifies the driver by removing the duplicated functionality. Signed-off-by: Grant Likely <grant.likely@linaro.org>
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0038821803
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@ -36,7 +36,7 @@ struct device_node *of_allnodes;
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EXPORT_SYMBOL(of_allnodes);
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struct device_node *of_chosen;
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struct device_node *of_aliases;
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static struct device_node *of_stdout;
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struct device_node *of_stdout;
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static struct kset *of_kset;
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@ -2063,9 +2063,12 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
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of_chosen = of_find_node_by_path("/chosen@0");
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if (of_chosen) {
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/* linux,stdout-path and /aliases/stdout are for legacy compatibility */
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const char *name = of_get_property(of_chosen, "stdout-path", NULL);
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if (!name)
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name = of_get_property(of_chosen, "linux,stdout-path", NULL);
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if (IS_ENABLED(CONFIG_PPC) && !name)
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name = of_get_property(of_aliases, "stdout", NULL);
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if (name)
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of_stdout = of_find_node_by_path(name);
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}
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@ -108,55 +108,23 @@ static void disable_tx_interrupt(struct ehv_bc_data *bc)
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*
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* The byte channel to be used for the console is specified via a "stdout"
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* property in the /chosen node.
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*
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* For compatible with legacy device trees, we also look for a "stdout" alias.
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*/
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static int find_console_handle(void)
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{
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struct device_node *np, *np2;
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struct device_node *np = of_stdout;
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const char *sprop = NULL;
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const uint32_t *iprop;
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np = of_find_node_by_path("/chosen");
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if (np)
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sprop = of_get_property(np, "stdout-path", NULL);
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if (!np || !sprop) {
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of_node_put(np);
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np = of_find_node_by_name(NULL, "aliases");
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if (np)
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sprop = of_get_property(np, "stdout", NULL);
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}
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if (!sprop) {
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of_node_put(np);
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return 0;
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}
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/* We don't care what the aliased node is actually called. We only
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* care if it's compatible with "epapr,hv-byte-channel", because that
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* indicates that it's a byte channel node. We use a temporary
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* variable, 'np2', because we can't release 'np' until we're done with
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* 'sprop'.
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* indicates that it's a byte channel node.
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*/
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np2 = of_find_node_by_path(sprop);
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of_node_put(np);
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np = np2;
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if (!np) {
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pr_warning("ehv-bc: stdout node '%s' does not exist\n", sprop);
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if (!np || !of_device_is_compatible(np, "epapr,hv-byte-channel"))
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return 0;
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}
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/* Is it a byte channel? */
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if (!of_device_is_compatible(np, "epapr,hv-byte-channel")) {
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of_node_put(np);
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return 0;
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}
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stdout_irq = irq_of_parse_and_map(np, 0);
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if (stdout_irq == NO_IRQ) {
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pr_err("ehv-bc: no 'interrupts' property in %s node\n", sprop);
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of_node_put(np);
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pr_err("ehv-bc: no 'interrupts' property in %s node\n", np->full_name);
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return 0;
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}
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@ -167,12 +135,9 @@ static int find_console_handle(void)
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if (!iprop) {
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pr_err("ehv-bc: no 'hv-handle' property in %s node\n",
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np->name);
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of_node_put(np);
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return 0;
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}
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stdout_bc = be32_to_cpu(*iprop);
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of_node_put(np);
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return 1;
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}
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@ -342,22 +342,13 @@ static void udbg_init_opal_common(void)
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void __init hvc_opal_init_early(void)
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{
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struct device_node *stdout_node = NULL;
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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 char *name = NULL;
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const struct hv_ops *ops;
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u32 index;
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/* find the boot console from /chosen/stdout */
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if (of_chosen)
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name = of_get_property(of_chosen, "linux,stdout-path", NULL);
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if (name) {
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stdout_node = of_find_node_by_path(name);
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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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pr_err("hvc_opal: Failed to locate default console!\n");
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return;
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}
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} else {
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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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@ -404,42 +404,35 @@ module_exit(hvc_vio_exit);
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void __init hvc_vio_init_early(void)
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{
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struct device_node *stdout_node;
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const __be32 *termno;
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const char *name;
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const struct hv_ops *ops;
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/* find the boot console from /chosen/stdout */
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if (!of_chosen)
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if (!of_stdout)
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return;
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name = of_get_property(of_chosen, "linux,stdout-path", NULL);
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if (name == NULL)
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return;
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stdout_node = of_find_node_by_path(name);
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if (!stdout_node)
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return;
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name = of_get_property(stdout_node, "name", NULL);
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name = of_get_property(of_stdout, "name", NULL);
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if (!name) {
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printk(KERN_WARNING "stdout node missing 'name' property!\n");
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goto out;
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return;
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}
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/* Check if it's a virtual terminal */
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if (strncmp(name, "vty", 3) != 0)
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goto out;
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termno = of_get_property(stdout_node, "reg", NULL);
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return;
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termno = of_get_property(of_stdout, "reg", NULL);
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if (termno == NULL)
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goto out;
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return;
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hvterm_priv0.termno = of_read_number(termno, 1);
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spin_lock_init(&hvterm_priv0.buf_lock);
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hvterm_privs[0] = &hvterm_priv0;
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/* Check the protocol */
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if (of_device_is_compatible(stdout_node, "hvterm1")) {
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if (of_device_is_compatible(of_stdout, "hvterm1")) {
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hvterm_priv0.proto = HV_PROTOCOL_RAW;
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ops = &hvterm_raw_ops;
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}
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else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
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else if (of_device_is_compatible(of_stdout, "hvterm-protocol")) {
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hvterm_priv0.proto = HV_PROTOCOL_HVSI;
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ops = &hvterm_hvsi_ops;
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hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
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@ -447,7 +440,7 @@ void __init hvc_vio_init_early(void)
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/* HVSI, perform the handshake now */
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hvsilib_establish(&hvterm_priv0.hvsi);
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} else
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goto out;
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return;
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udbg_putc = udbg_hvc_putc;
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udbg_getc = udbg_hvc_getc;
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udbg_getc_poll = udbg_hvc_getc_poll;
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@ -456,14 +449,12 @@ void __init hvc_vio_init_early(void)
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* backend for HVSI, only do udbg
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*/
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if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
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goto out;
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return;
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#endif
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/* Check whether the user has requested a different console. */
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if (!strstr(cmd_line, "console="))
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add_preferred_console("hvc", 0, NULL);
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hvc_instantiate(0, 0, ops);
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out:
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of_node_put(stdout_node);
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}
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/* call this from early_init() for a working debug console on
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@ -113,6 +113,7 @@ static inline void of_node_put(struct device_node *node) { }
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extern struct device_node *of_allnodes;
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extern struct device_node *of_chosen;
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extern struct device_node *of_aliases;
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extern struct device_node *of_stdout;
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extern raw_spinlock_t devtree_lock;
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static inline bool of_have_populated_dt(void)
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