/*- * Copyright 2016 Michal Meloun * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include "opt_platform.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef FDT #include #include #include #endif #include SYSCTL_NODE(_hw, OID_AUTO, clock, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Clocks"); MALLOC_DEFINE(M_CLOCK, "clocks", "Clock framework"); /* Forward declarations. */ struct clk; struct clknodenode; struct clkdom; typedef TAILQ_HEAD(clknode_list, clknode) clknode_list_t; typedef TAILQ_HEAD(clkdom_list, clkdom) clkdom_list_t; /* Default clock methods. */ static int clknode_method_init(struct clknode *clk, device_t dev); static int clknode_method_recalc_freq(struct clknode *clk, uint64_t *freq); static int clknode_method_set_freq(struct clknode *clk, uint64_t fin, uint64_t *fout, int flags, int *stop); static int clknode_method_set_gate(struct clknode *clk, bool enable); static int clknode_method_set_mux(struct clknode *clk, int idx); /* * Clock controller methods. */ static clknode_method_t clknode_methods[] = { CLKNODEMETHOD(clknode_init, clknode_method_init), CLKNODEMETHOD(clknode_recalc_freq, clknode_method_recalc_freq), CLKNODEMETHOD(clknode_set_freq, clknode_method_set_freq), CLKNODEMETHOD(clknode_set_gate, clknode_method_set_gate), CLKNODEMETHOD(clknode_set_mux, clknode_method_set_mux), CLKNODEMETHOD_END }; DEFINE_CLASS_0(clknode, clknode_class, clknode_methods, 0); /* * Clock node - basic element for modeling SOC clock graph. It holds the clock * provider's data about the clock, and the links for the clock's membership in * various lists. */ struct clknode { KOBJ_FIELDS; /* Clock nodes topology. */ struct clkdom *clkdom; /* Owning clock domain */ TAILQ_ENTRY(clknode) clkdom_link; /* Domain list entry */ TAILQ_ENTRY(clknode) clklist_link; /* Global list entry */ /* String based parent list. */ const char **parent_names; /* Array of parent names */ int parent_cnt; /* Number of parents */ int parent_idx; /* Parent index or -1 */ /* Cache for already resolved names. */ struct clknode **parents; /* Array of potential parents */ struct clknode *parent; /* Current parent */ /* Parent/child relationship links. */ clknode_list_t children; /* List of our children */ TAILQ_ENTRY(clknode) sibling_link; /* Our entry in parent's list */ /* Details of this device. */ void *softc; /* Instance softc */ const char *name; /* Globally unique name */ intptr_t id; /* Per domain unique id */ int flags; /* CLK_FLAG_* */ struct sx lock; /* Lock for this clock */ int ref_cnt; /* Reference counter */ int enable_cnt; /* Enabled counter */ /* Cached values. */ uint64_t freq; /* Actual frequency */ struct sysctl_ctx_list sysctl_ctx; }; /* * Per consumer data, information about how a consumer is using a clock node. * A pointer to this structure is used as a handle in the consumer interface. */ struct clk { device_t dev; struct clknode *clknode; int enable_cnt; }; /* * Clock domain - a group of clocks provided by one clock device. */ struct clkdom { device_t dev; /* Link to provider device */ TAILQ_ENTRY(clkdom) link; /* Global domain list entry */ clknode_list_t clknode_list; /* All clocks in the domain */ #ifdef FDT clknode_ofw_mapper_func *ofw_mapper; /* Find clock using FDT xref */ #endif }; /* * The system-wide list of clock domains. */ static clkdom_list_t clkdom_list = TAILQ_HEAD_INITIALIZER(clkdom_list); /* * Each clock node is linked on a system-wide list and can be searched by name. */ static clknode_list_t clknode_list = TAILQ_HEAD_INITIALIZER(clknode_list); /* * Locking - we use three levels of locking: * - First, topology lock is taken. This one protect all lists. * - Second level is per clknode lock. It protects clknode data. * - Third level is outside of this file, it protect clock device registers. * First two levels use sleepable locks; clock device can use mutex or sx lock. */ static struct sx clk_topo_lock; SX_SYSINIT(clock_topology, &clk_topo_lock, "Clock topology lock"); #define CLK_TOPO_SLOCK() sx_slock(&clk_topo_lock) #define CLK_TOPO_XLOCK() sx_xlock(&clk_topo_lock) #define CLK_TOPO_UNLOCK() sx_unlock(&clk_topo_lock) #define CLK_TOPO_ASSERT() sx_assert(&clk_topo_lock, SA_LOCKED) #define CLK_TOPO_XASSERT() sx_assert(&clk_topo_lock, SA_XLOCKED) #define CLKNODE_SLOCK(_sc) sx_slock(&((_sc)->lock)) #define CLKNODE_XLOCK(_sc) sx_xlock(&((_sc)->lock)) #define CLKNODE_UNLOCK(_sc) sx_unlock(&((_sc)->lock)) static void clknode_adjust_parent(struct clknode *clknode, int idx); enum clknode_sysctl_type { CLKNODE_SYSCTL_PARENT, CLKNODE_SYSCTL_PARENTS_LIST, CLKNODE_SYSCTL_CHILDREN_LIST, }; static int clknode_sysctl(SYSCTL_HANDLER_ARGS); static int clkdom_sysctl(SYSCTL_HANDLER_ARGS); static void clknode_finish(void *dummy); SYSINIT(clknode_finish, SI_SUB_LAST, SI_ORDER_ANY, clknode_finish, NULL); /* * Default clock methods for base class. */ static int clknode_method_init(struct clknode *clknode, device_t dev) { return (0); } static int clknode_method_recalc_freq(struct clknode *clknode, uint64_t *freq) { return (0); } static int clknode_method_set_freq(struct clknode *clknode, uint64_t fin, uint64_t *fout, int flags, int *stop) { *stop = 0; return (0); } static int clknode_method_set_gate(struct clknode *clk, bool enable) { return (0); } static int clknode_method_set_mux(struct clknode *clk, int idx) { return (0); } /* * Internal functions. */ /* * Duplicate an array of parent names. * * Compute total size and allocate a single block which holds both the array of * pointers to strings and the copied strings themselves. Returns a pointer to * the start of the block where the array of copied string pointers lives. * * XXX Revisit this, no need for the DECONST stuff. */ static const char ** strdup_list(const char **names, int num) { size_t len, slen; const char **outptr, *ptr; int i; len = sizeof(char *) * num; for (i = 0; i < num; i++) { if (names[i] == NULL) continue; slen = strlen(names[i]); if (slen == 0) panic("Clock parent names array have empty string"); len += slen + 1; } outptr = malloc(len, M_CLOCK, M_WAITOK | M_ZERO); ptr = (char *)(outptr + num); for (i = 0; i < num; i++) { if (names[i] == NULL) continue; outptr[i] = ptr; slen = strlen(names[i]) + 1; bcopy(names[i], __DECONST(void *, outptr[i]), slen); ptr += slen; } return (outptr); } /* * Recompute the cached frequency for this node and all its children. */ static int clknode_refresh_cache(struct clknode *clknode, uint64_t freq) { int rv; struct clknode *entry; CLK_TOPO_XASSERT(); /* Compute generated frequency. */ rv = CLKNODE_RECALC_FREQ(clknode, &freq); if (rv != 0) { /* XXX If an error happens while refreshing children * this leaves the world in a partially-updated state. * Panic for now. */ panic("clknode_refresh_cache failed for '%s'\n", clknode->name); return (rv); } /* Refresh cache for this node. */ clknode->freq = freq; /* Refresh cache for all children. */ TAILQ_FOREACH(entry, &(clknode->children), sibling_link) { rv = clknode_refresh_cache(entry, freq); if (rv != 0) return (rv); } return (0); } /* * Public interface. */ struct clknode * clknode_find_by_name(const char *name) { struct clknode *entry; CLK_TOPO_ASSERT(); TAILQ_FOREACH(entry, &clknode_list, clklist_link) { if (strcmp(entry->name, name) == 0) return (entry); } return (NULL); } struct clknode * clknode_find_by_id(struct clkdom *clkdom, intptr_t id) { struct clknode *entry; CLK_TOPO_ASSERT(); TAILQ_FOREACH(entry, &clkdom->clknode_list, clkdom_link) { if (entry->id == id) return (entry); } return (NULL); } /* -------------------------------------------------------------------------- */ /* * Clock domain functions */ /* Find clock domain associated to device in global list. */ struct clkdom * clkdom_get_by_dev(const device_t dev) { struct clkdom *entry; CLK_TOPO_ASSERT(); TAILQ_FOREACH(entry, &clkdom_list, link) { if (entry->dev == dev) return (entry); } return (NULL); } #ifdef FDT /* Default DT mapper. */ static int clknode_default_ofw_map(struct clkdom *clkdom, uint32_t ncells, phandle_t *cells, struct clknode **clk) { CLK_TOPO_ASSERT(); if (ncells == 0) *clk = clknode_find_by_id(clkdom, 1); else if (ncells == 1) *clk = clknode_find_by_id(clkdom, cells[0]); else return (ERANGE); if (*clk == NULL) return (ENXIO); return (0); } #endif /* * Create a clock domain. Returns with the topo lock held. */ struct clkdom * clkdom_create(device_t dev) { struct clkdom *clkdom; clkdom = malloc(sizeof(struct clkdom), M_CLOCK, M_WAITOK | M_ZERO); clkdom->dev = dev; TAILQ_INIT(&clkdom->clknode_list); #ifdef FDT clkdom->ofw_mapper = clknode_default_ofw_map; #endif SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "clocks", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, clkdom, 0, clkdom_sysctl, "A", "Clock list for the domain"); return (clkdom); } void clkdom_unlock(struct clkdom *clkdom) { CLK_TOPO_UNLOCK(); } void clkdom_xlock(struct clkdom *clkdom) { CLK_TOPO_XLOCK(); } /* * Finalize initialization of clock domain. Releases topo lock. * * XXX Revisit failure handling. */ int clkdom_finit(struct clkdom *clkdom) { struct clknode *clknode; int i, rv; #ifdef FDT phandle_t node; if ((node = ofw_bus_get_node(clkdom->dev)) == -1) { device_printf(clkdom->dev, "%s called on not ofw based device\n", __func__); return (ENXIO); } #endif rv = 0; /* Make clock domain globally visible. */ CLK_TOPO_XLOCK(); TAILQ_INSERT_TAIL(&clkdom_list, clkdom, link); #ifdef FDT OF_device_register_xref(OF_xref_from_node(node), clkdom->dev); #endif /* Register all clock names into global list. */ TAILQ_FOREACH(clknode, &clkdom->clknode_list, clkdom_link) { TAILQ_INSERT_TAIL(&clknode_list, clknode, clklist_link); } /* * At this point all domain nodes must be registered and all * parents must be valid. */ TAILQ_FOREACH(clknode, &clkdom->clknode_list, clkdom_link) { if (clknode->parent_cnt == 0) continue; for (i = 0; i < clknode->parent_cnt; i++) { if (clknode->parents[i] != NULL) continue; if (clknode->parent_names[i] == NULL) continue; clknode->parents[i] = clknode_find_by_name( clknode->parent_names[i]); if (clknode->parents[i] == NULL) { device_printf(clkdom->dev, "Clock %s have unknown parent: %s\n", clknode->name, clknode->parent_names[i]); rv = ENODEV; } } /* If parent index is not set yet... */ if (clknode->parent_idx == CLKNODE_IDX_NONE) { device_printf(clkdom->dev, "Clock %s have not set parent idx\n", clknode->name); rv = ENXIO; continue; } if (clknode->parents[clknode->parent_idx] == NULL) { device_printf(clkdom->dev, "Clock %s have unknown parent(idx %d): %s\n", clknode->name, clknode->parent_idx, clknode->parent_names[clknode->parent_idx]); rv = ENXIO; continue; } clknode_adjust_parent(clknode, clknode->parent_idx); } CLK_TOPO_UNLOCK(); return (rv); } /* Dump clock domain. */ void clkdom_dump(struct clkdom * clkdom) { struct clknode *clknode; int rv; uint64_t freq; CLK_TOPO_SLOCK(); TAILQ_FOREACH(clknode, &clkdom->clknode_list, clkdom_link) { rv = clknode_get_freq(clknode, &freq); printf("Clock: %s, parent: %s(%d), freq: %ju\n", clknode->name, clknode->parent == NULL ? "(NULL)" : clknode->parent->name, clknode->parent_idx, (uintmax_t)((rv == 0) ? freq: rv)); } CLK_TOPO_UNLOCK(); } /* * Create and initialize clock object, but do not register it. */ struct clknode * clknode_create(struct clkdom * clkdom, clknode_class_t clknode_class, const struct clknode_init_def *def) { struct clknode *clknode; struct sysctl_oid *clknode_oid; bool replaced; KASSERT(def->name != NULL, ("clock name is NULL")); KASSERT(def->name[0] != '\0', ("clock name is empty")); if (def->flags & CLK_NODE_LINKED) { KASSERT(def->parent_cnt == 0, ("Linked clock must not have parents")); KASSERT(clknode_class->size== 0, ("Linked clock cannot have own softc")); } /* Process duplicated clocks */ CLK_TOPO_SLOCK(); clknode = clknode_find_by_name(def->name); CLK_TOPO_UNLOCK(); if (clknode != NULL) { if (!(clknode->flags & CLK_NODE_LINKED) && def->flags & CLK_NODE_LINKED) { /* * New clock is linked and real already exists. * Do nothing and return real node. It is in right * domain, enqueued in right lists and fully initialized. */ return (clknode); } else if (clknode->flags & CLK_NODE_LINKED && !(def->flags & CLK_NODE_LINKED)) { /* * New clock is real but linked already exists. * Remove old linked node from originating domain * (real clock must be owned by another) and from * global names link (it will be added back into it * again in following clknode_register()). Then reuse * original clknode structure and reinitialize it * with new dat. By this, all lists containing this * node remains valid, but the new node virtually * replace the linked one. */ KASSERT(clkdom != clknode->clkdom, ("linked clock must be from another " "domain that real one")); TAILQ_REMOVE(&clkdom->clknode_list, clknode, clkdom_link); TAILQ_REMOVE(&clknode_list, clknode, clklist_link); replaced = true; } else if (clknode->flags & CLK_NODE_LINKED && def->flags & CLK_NODE_LINKED) { /* * Both clocks are linked. * Return old one, so we hold only one copy od link. */ return (clknode); } else { /* Both clocks are real */ panic("Duplicated clock registration: %s\n", def->name); } } else { /* Create clknode object and initialize it. */ clknode = malloc(sizeof(struct clknode), M_CLOCK, M_WAITOK | M_ZERO); sx_init(&clknode->lock, "Clocknode lock"); TAILQ_INIT(&clknode->children); replaced = false; } kobj_init((kobj_t)clknode, (kobj_class_t)clknode_class); /* Allocate softc if required. */ if (clknode_class->size > 0) { clknode->softc = malloc(clknode_class->size, M_CLOCK, M_WAITOK | M_ZERO); } /* Prepare array for ptrs to parent clocks. */ clknode->parents = malloc(sizeof(struct clknode *) * def->parent_cnt, M_CLOCK, M_WAITOK | M_ZERO); /* Copy all strings unless they're flagged as static. */ if (def->flags & CLK_NODE_STATIC_STRINGS) { clknode->name = def->name; clknode->parent_names = def->parent_names; } else { clknode->name = strdup(def->name, M_CLOCK); clknode->parent_names = strdup_list(def->parent_names, def->parent_cnt); } /* Rest of init. */ clknode->id = def->id; clknode->clkdom = clkdom; clknode->flags = def->flags; clknode->parent_cnt = def->parent_cnt; clknode->parent = NULL; clknode->parent_idx = CLKNODE_IDX_NONE; if (replaced) return (clknode); sysctl_ctx_init(&clknode->sysctl_ctx); clknode_oid = SYSCTL_ADD_NODE(&clknode->sysctl_ctx, SYSCTL_STATIC_CHILDREN(_hw_clock), OID_AUTO, clknode->name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "A clock node"); SYSCTL_ADD_U64(&clknode->sysctl_ctx, SYSCTL_CHILDREN(clknode_oid), OID_AUTO, "frequency", CTLFLAG_RD, &clknode->freq, 0, "The clock frequency"); SYSCTL_ADD_PROC(&clknode->sysctl_ctx, SYSCTL_CHILDREN(clknode_oid), OID_AUTO, "parent", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, clknode, CLKNODE_SYSCTL_PARENT, clknode_sysctl, "A", "The clock parent"); SYSCTL_ADD_PROC(&clknode->sysctl_ctx, SYSCTL_CHILDREN(clknode_oid), OID_AUTO, "parents", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, clknode, CLKNODE_SYSCTL_PARENTS_LIST, clknode_sysctl, "A", "The clock parents list"); SYSCTL_ADD_PROC(&clknode->sysctl_ctx, SYSCTL_CHILDREN(clknode_oid), OID_AUTO, "childrens", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, clknode, CLKNODE_SYSCTL_CHILDREN_LIST, clknode_sysctl, "A", "The clock childrens list"); SYSCTL_ADD_INT(&clknode->sysctl_ctx, SYSCTL_CHILDREN(clknode_oid), OID_AUTO, "enable_cnt", CTLFLAG_RD, &clknode->enable_cnt, 0, "The clock enable counter"); return (clknode); } /* * Register clock object into clock domain hierarchy. */ struct clknode * clknode_register(struct clkdom * clkdom, struct clknode *clknode) { int rv; /* Skip already registered linked node */ if (clknode->flags & CLK_NODE_REGISTERED) return(clknode); rv = CLKNODE_INIT(clknode, clknode_get_device(clknode)); if (rv != 0) { printf(" CLKNODE_INIT failed: %d\n", rv); return (NULL); } TAILQ_INSERT_TAIL(&clkdom->clknode_list, clknode, clkdom_link); clknode->flags |= CLK_NODE_REGISTERED; return (clknode); } static void clknode_finish(void *dummy) { struct clknode *clknode; CLK_TOPO_SLOCK(); TAILQ_FOREACH(clknode, &clknode_list, clklist_link) { if (clknode->flags & CLK_NODE_LINKED) printf("Unresolved linked clock found: %s\n", clknode->name); } CLK_TOPO_UNLOCK(); } /* * Clock providers interface. */ /* * Reparent clock node. */ static void clknode_adjust_parent(struct clknode *clknode, int idx) { CLK_TOPO_XASSERT(); if (clknode->parent_cnt == 0) return; if ((idx == CLKNODE_IDX_NONE) || (idx >= clknode->parent_cnt)) panic("%s: Invalid parent index %d for clock %s", __func__, idx, clknode->name); if (clknode->parents[idx] == NULL) panic("%s: Invalid parent index %d for clock %s", __func__, idx, clknode->name); /* Remove me from old children list. */ if (clknode->parent != NULL) { TAILQ_REMOVE(&clknode->parent->children, clknode, sibling_link); } /* Insert into children list of new parent. */ clknode->parent_idx = idx; clknode->parent = clknode->parents[idx]; TAILQ_INSERT_TAIL(&clknode->parent->children, clknode, sibling_link); } /* * Set parent index - init function. */ void clknode_init_parent_idx(struct clknode *clknode, int idx) { if (clknode->parent_cnt == 0) { clknode->parent_idx = CLKNODE_IDX_NONE; clknode->parent = NULL; return; } if ((idx == CLKNODE_IDX_NONE) || (idx >= clknode->parent_cnt) || (clknode->parent_names[idx] == NULL)) panic("%s: Invalid parent index %d for clock %s", __func__, idx, clknode->name); clknode->parent_idx = idx; } int clknode_set_parent_by_idx(struct clknode *clknode, int idx) { int rv; uint64_t freq; int oldidx; /* We have exclusive topology lock, node lock is not needed. */ CLK_TOPO_XASSERT(); if (clknode->parent_cnt == 0) return (0); if (clknode->parent_idx == idx) return (0); oldidx = clknode->parent_idx; clknode_adjust_parent(clknode, idx); rv = CLKNODE_SET_MUX(clknode, idx); if (rv != 0) { clknode_adjust_parent(clknode, oldidx); return (rv); } rv = clknode_get_freq(clknode->parent, &freq); if (rv != 0) return (rv); rv = clknode_refresh_cache(clknode, freq); return (rv); } int clknode_set_parent_by_name(struct clknode *clknode, const char *name) { int rv; uint64_t freq; int oldidx, idx; /* We have exclusive topology lock, node lock is not needed. */ CLK_TOPO_XASSERT(); if (clknode->parent_cnt == 0) return (0); /* * If this node doesnt have mux, then passthrough request to parent. * This feature is used in clock domain initialization and allows us to * set clock source and target frequency on the tail node of the clock * chain. */ if (clknode->parent_cnt == 1) { rv = clknode_set_parent_by_name(clknode->parent, name); return (rv); } for (idx = 0; idx < clknode->parent_cnt; idx++) { if (clknode->parent_names[idx] == NULL) continue; if (strcmp(clknode->parent_names[idx], name) == 0) break; } if (idx >= clknode->parent_cnt) { return (ENXIO); } if (clknode->parent_idx == idx) return (0); oldidx = clknode->parent_idx; clknode_adjust_parent(clknode, idx); rv = CLKNODE_SET_MUX(clknode, idx); if (rv != 0) { clknode_adjust_parent(clknode, oldidx); CLKNODE_UNLOCK(clknode); return (rv); } rv = clknode_get_freq(clknode->parent, &freq); if (rv != 0) return (rv); rv = clknode_refresh_cache(clknode, freq); return (rv); } struct clknode * clknode_get_parent(struct clknode *clknode) { return (clknode->parent); } const char * clknode_get_name(struct clknode *clknode) { return (clknode->name); } const char ** clknode_get_parent_names(struct clknode *clknode) { return (clknode->parent_names); } int clknode_get_parents_num(struct clknode *clknode) { return (clknode->parent_cnt); } int clknode_get_parent_idx(struct clknode *clknode) { return (clknode->parent_idx); } int clknode_get_flags(struct clknode *clknode) { return (clknode->flags); } void * clknode_get_softc(struct clknode *clknode) { return (clknode->softc); } device_t clknode_get_device(struct clknode *clknode) { return (clknode->clkdom->dev); } #ifdef FDT void clkdom_set_ofw_mapper(struct clkdom * clkdom, clknode_ofw_mapper_func *map) { clkdom->ofw_mapper = map; } #endif /* * Real consumers executive */ int clknode_get_freq(struct clknode *clknode, uint64_t *freq) { int rv; CLK_TOPO_ASSERT(); /* Use cached value, if it exists. */ *freq = clknode->freq; if (*freq != 0) return (0); /* Get frequency from parent, if the clock has a parent. */ if (clknode->parent_cnt > 0) { rv = clknode_get_freq(clknode->parent, freq); if (rv != 0) { return (rv); } } /* And recalculate my output frequency. */ CLKNODE_XLOCK(clknode); rv = CLKNODE_RECALC_FREQ(clknode, freq); if (rv != 0) { CLKNODE_UNLOCK(clknode); printf("Cannot get frequency for clk: %s, error: %d\n", clknode->name, rv); return (rv); } /* Save new frequency to cache. */ clknode->freq = *freq; CLKNODE_UNLOCK(clknode); return (0); } int clknode_set_freq(struct clknode *clknode, uint64_t freq, int flags, int enablecnt) { int rv, done; uint64_t parent_freq; /* We have exclusive topology lock, node lock is not needed. */ CLK_TOPO_XASSERT(); /* Check for no change */ if (clknode->freq == freq) return (0); parent_freq = 0; /* * We can set frequency only if * clock is disabled * OR * clock is glitch free and is enabled by calling consumer only */ if ((flags & CLK_SET_DRYRUN) == 0 && clknode->enable_cnt > 1 && clknode->enable_cnt > enablecnt && (clknode->flags & CLK_NODE_GLITCH_FREE) == 0) { return (EBUSY); } /* Get frequency from parent, if the clock has a parent. */ if (clknode->parent_cnt > 0) { rv = clknode_get_freq(clknode->parent, &parent_freq); if (rv != 0) { return (rv); } } /* Set frequency for this clock. */ rv = CLKNODE_SET_FREQ(clknode, parent_freq, &freq, flags, &done); if (rv != 0) { printf("Cannot set frequency for clk: %s, error: %d\n", clknode->name, rv); if ((flags & CLK_SET_DRYRUN) == 0) clknode_refresh_cache(clknode, parent_freq); return (rv); } if (done) { /* Success - invalidate frequency cache for all children. */ if ((flags & CLK_SET_DRYRUN) == 0) { clknode->freq = freq; /* Clock might have reparent during set_freq */ if (clknode->parent_cnt > 0) { rv = clknode_get_freq(clknode->parent, &parent_freq); if (rv != 0) { return (rv); } } clknode_refresh_cache(clknode, parent_freq); } } else if (clknode->parent != NULL) { /* Nothing changed, pass request to parent. */ rv = clknode_set_freq(clknode->parent, freq, flags, enablecnt); } else { /* End of chain without action. */ printf("Cannot set frequency for clk: %s, end of chain\n", clknode->name); rv = ENXIO; } return (rv); } int clknode_enable(struct clknode *clknode) { int rv; CLK_TOPO_ASSERT(); /* Enable clock for each node in chain, starting from source. */ if (clknode->parent_cnt > 0) { rv = clknode_enable(clknode->parent); if (rv != 0) { return (rv); } } /* Handle this node */ CLKNODE_XLOCK(clknode); if (clknode->enable_cnt == 0) { rv = CLKNODE_SET_GATE(clknode, 1); if (rv != 0) { CLKNODE_UNLOCK(clknode); return (rv); } } clknode->enable_cnt++; CLKNODE_UNLOCK(clknode); return (0); } int clknode_disable(struct clknode *clknode) { int rv; CLK_TOPO_ASSERT(); rv = 0; CLKNODE_XLOCK(clknode); /* Disable clock for each node in chain, starting from consumer. */ if ((clknode->enable_cnt == 1) && ((clknode->flags & CLK_NODE_CANNOT_STOP) == 0)) { rv = CLKNODE_SET_GATE(clknode, 0); if (rv != 0) { CLKNODE_UNLOCK(clknode); return (rv); } } clknode->enable_cnt--; CLKNODE_UNLOCK(clknode); if (clknode->parent_cnt > 0) { rv = clknode_disable(clknode->parent); } return (rv); } int clknode_stop(struct clknode *clknode, int depth) { int rv; CLK_TOPO_ASSERT(); rv = 0; CLKNODE_XLOCK(clknode); /* The first node cannot be enabled. */ if ((clknode->enable_cnt != 0) && (depth == 0)) { CLKNODE_UNLOCK(clknode); return (EBUSY); } /* Stop clock for each node in chain, starting from consumer. */ if ((clknode->enable_cnt == 0) && ((clknode->flags & CLK_NODE_CANNOT_STOP) == 0)) { rv = CLKNODE_SET_GATE(clknode, 0); if (rv != 0) { CLKNODE_UNLOCK(clknode); return (rv); } } CLKNODE_UNLOCK(clknode); if (clknode->parent_cnt > 0) rv = clknode_stop(clknode->parent, depth + 1); return (rv); } /* -------------------------------------------------------------------------- * * Clock consumers interface. * */ /* Helper function for clk_get*() */ static clk_t clk_create(struct clknode *clknode, device_t dev) { struct clk *clk; CLK_TOPO_ASSERT(); clk = malloc(sizeof(struct clk), M_CLOCK, M_WAITOK); clk->dev = dev; clk->clknode = clknode; clk->enable_cnt = 0; clknode->ref_cnt++; return (clk); } int clk_get_freq(clk_t clk, uint64_t *freq) { int rv; struct clknode *clknode; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); CLK_TOPO_SLOCK(); rv = clknode_get_freq(clknode, freq); CLK_TOPO_UNLOCK(); return (rv); } int clk_set_freq(clk_t clk, uint64_t freq, int flags) { int rv; struct clknode *clknode; flags &= CLK_SET_USER_MASK; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); CLK_TOPO_XLOCK(); rv = clknode_set_freq(clknode, freq, flags, clk->enable_cnt); CLK_TOPO_UNLOCK(); return (rv); } int clk_test_freq(clk_t clk, uint64_t freq, int flags) { int rv; struct clknode *clknode; flags &= CLK_SET_USER_MASK; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); CLK_TOPO_XLOCK(); rv = clknode_set_freq(clknode, freq, flags | CLK_SET_DRYRUN, 0); CLK_TOPO_UNLOCK(); return (rv); } int clk_get_parent(clk_t clk, clk_t *parent) { struct clknode *clknode; struct clknode *parentnode; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); CLK_TOPO_SLOCK(); parentnode = clknode_get_parent(clknode); if (parentnode == NULL) { CLK_TOPO_UNLOCK(); return (ENODEV); } *parent = clk_create(parentnode, clk->dev); CLK_TOPO_UNLOCK(); return (0); } int clk_set_parent_by_clk(clk_t clk, clk_t parent) { int rv; struct clknode *clknode; struct clknode *parentnode; clknode = clk->clknode; parentnode = parent->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); KASSERT(parentnode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); CLK_TOPO_XLOCK(); rv = clknode_set_parent_by_name(clknode, parentnode->name); CLK_TOPO_UNLOCK(); return (rv); } int clk_enable(clk_t clk) { int rv; struct clknode *clknode; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); CLK_TOPO_SLOCK(); rv = clknode_enable(clknode); if (rv == 0) clk->enable_cnt++; CLK_TOPO_UNLOCK(); return (rv); } int clk_disable(clk_t clk) { int rv; struct clknode *clknode; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); KASSERT(clk->enable_cnt > 0, ("Attempt to disable already disabled clock: %s\n", clknode->name)); CLK_TOPO_SLOCK(); rv = clknode_disable(clknode); if (rv == 0) clk->enable_cnt--; CLK_TOPO_UNLOCK(); return (rv); } int clk_stop(clk_t clk) { int rv; struct clknode *clknode; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); KASSERT(clk->enable_cnt == 0, ("Attempt to stop already enabled clock: %s\n", clknode->name)); CLK_TOPO_SLOCK(); rv = clknode_stop(clknode, 0); CLK_TOPO_UNLOCK(); return (rv); } int clk_release(clk_t clk) { struct clknode *clknode; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); CLK_TOPO_SLOCK(); while (clk->enable_cnt > 0) { clknode_disable(clknode); clk->enable_cnt--; } CLKNODE_XLOCK(clknode); clknode->ref_cnt--; CLKNODE_UNLOCK(clknode); CLK_TOPO_UNLOCK(); free(clk, M_CLOCK); return (0); } const char * clk_get_name(clk_t clk) { const char *name; struct clknode *clknode; clknode = clk->clknode; KASSERT(clknode->ref_cnt > 0, ("Attempt to access unreferenced clock: %s\n", clknode->name)); name = clknode_get_name(clknode); return (name); } int clk_get_by_name(device_t dev, const char *name, clk_t *clk) { struct clknode *clknode; CLK_TOPO_SLOCK(); clknode = clknode_find_by_name(name); if (clknode == NULL) { CLK_TOPO_UNLOCK(); return (ENODEV); } *clk = clk_create(clknode, dev); CLK_TOPO_UNLOCK(); return (0); } int clk_get_by_id(device_t dev, struct clkdom *clkdom, intptr_t id, clk_t *clk) { struct clknode *clknode; CLK_TOPO_SLOCK(); clknode = clknode_find_by_id(clkdom, id); if (clknode == NULL) { CLK_TOPO_UNLOCK(); return (ENODEV); } *clk = clk_create(clknode, dev); CLK_TOPO_UNLOCK(); return (0); } #ifdef FDT static void clk_set_assigned_parent(device_t dev, clk_t clk, int idx) { clk_t parent; const char *pname; int rv; rv = clk_get_by_ofw_index_prop(dev, 0, "assigned-clock-parents", idx, &parent); if (rv != 0) { device_printf(dev, "cannot get parent at idx %d\n", idx); return; } pname = clk_get_name(parent); rv = clk_set_parent_by_clk(clk, parent); if (rv != 0) device_printf(dev, "Cannot set parent %s for clock %s\n", pname, clk_get_name(clk)); else if (bootverbose) device_printf(dev, "Set %s as the parent of %s\n", pname, clk_get_name(clk)); clk_release(parent); } static void clk_set_assigned_rates(device_t dev, clk_t clk, uint32_t freq) { int rv; rv = clk_set_freq(clk, freq, CLK_SET_ROUND_DOWN | CLK_SET_ROUND_UP); if (rv != 0) { device_printf(dev, "Failed to set %s to a frequency of %u\n", clk_get_name(clk), freq); return; } if (bootverbose) device_printf(dev, "Set %s to %u\n", clk_get_name(clk), freq); } int clk_set_assigned(device_t dev, phandle_t node) { clk_t clk; uint32_t *rates; int rv, nclocks, nrates, nparents, i; rv = ofw_bus_parse_xref_list_get_length(node, "assigned-clocks", "#clock-cells", &nclocks); if (rv != 0) { if (rv != ENOENT) device_printf(dev, "cannot parse assigned-clock property\n"); return (rv); } nrates = OF_getencprop_alloc_multi(node, "assigned-clock-rates", sizeof(*rates), (void **)&rates); if (nrates <= 0) nrates = 0; if (ofw_bus_parse_xref_list_get_length(node, "assigned-clock-parents", "#clock-cells", &nparents) != 0) nparents = -1; for (i = 0; i < nclocks; i++) { /* First get the clock we are supposed to modify */ rv = clk_get_by_ofw_index_prop(dev, 0, "assigned-clocks", i, &clk); if (rv != 0) { if (bootverbose) device_printf(dev, "cannot get assigned clock at idx %d\n", i); continue; } /* First set it's parent if needed */ if (i < nparents) clk_set_assigned_parent(dev, clk, i); /* Then set a new frequency */ if (i < nrates && rates[i] != 0) clk_set_assigned_rates(dev, clk, rates[i]); clk_release(clk); } if (rates != NULL) OF_prop_free(rates); return (0); } int clk_get_by_ofw_index_prop(device_t dev, phandle_t cnode, const char *prop, int idx, clk_t *clk) { phandle_t parent, *cells; device_t clockdev; int ncells, rv; struct clkdom *clkdom; struct clknode *clknode; *clk = NULL; if (cnode <= 0) cnode = ofw_bus_get_node(dev); if (cnode <= 0) { device_printf(dev, "%s called on not ofw based device\n", __func__); return (ENXIO); } rv = ofw_bus_parse_xref_list_alloc(cnode, prop, "#clock-cells", idx, &parent, &ncells, &cells); if (rv != 0) { return (rv); } clockdev = OF_device_from_xref(parent); if (clockdev == NULL) { rv = ENODEV; goto done; } CLK_TOPO_SLOCK(); clkdom = clkdom_get_by_dev(clockdev); if (clkdom == NULL){ CLK_TOPO_UNLOCK(); rv = ENXIO; goto done; } rv = clkdom->ofw_mapper(clkdom, ncells, cells, &clknode); if (rv == 0) { *clk = clk_create(clknode, dev); } CLK_TOPO_UNLOCK(); done: if (cells != NULL) OF_prop_free(cells); return (rv); } int clk_get_by_ofw_index(device_t dev, phandle_t cnode, int idx, clk_t *clk) { return (clk_get_by_ofw_index_prop(dev, cnode, "clocks", idx, clk)); } int clk_get_by_ofw_name(device_t dev, phandle_t cnode, const char *name, clk_t *clk) { int rv, idx; if (cnode <= 0) cnode = ofw_bus_get_node(dev); if (cnode <= 0) { device_printf(dev, "%s called on not ofw based device\n", __func__); return (ENXIO); } rv = ofw_bus_find_string_index(cnode, "clock-names", name, &idx); if (rv != 0) return (rv); return (clk_get_by_ofw_index(dev, cnode, idx, clk)); } /* -------------------------------------------------------------------------- * * Support functions for parsing various clock related OFW things. */ /* * Get "clock-output-names" and (optional) "clock-indices" lists. * Both lists are alocated using M_OFWPROP specifier. * * Returns number of items or 0. */ int clk_parse_ofw_out_names(device_t dev, phandle_t node, const char ***out_names, uint32_t **indices) { int name_items, rv; *out_names = NULL; *indices = NULL; if (!OF_hasprop(node, "clock-output-names")) return (0); rv = ofw_bus_string_list_to_array(node, "clock-output-names", out_names); if (rv <= 0) return (0); name_items = rv; if (!OF_hasprop(node, "clock-indices")) return (name_items); rv = OF_getencprop_alloc_multi(node, "clock-indices", sizeof (uint32_t), (void **)indices); if (rv != name_items) { device_printf(dev, " Size of 'clock-output-names' and " "'clock-indices' differs\n"); OF_prop_free(*out_names); OF_prop_free(*indices); return (0); } return (name_items); } /* * Get output clock name for single output clock node. */ int clk_parse_ofw_clk_name(device_t dev, phandle_t node, const char **name) { const char **out_names; const char *tmp_name; int rv; *name = NULL; if (!OF_hasprop(node, "clock-output-names")) { tmp_name = ofw_bus_get_name(dev); if (tmp_name == NULL) return (ENXIO); *name = strdup(tmp_name, M_OFWPROP); return (0); } rv = ofw_bus_string_list_to_array(node, "clock-output-names", &out_names); if (rv != 1) { OF_prop_free(out_names); device_printf(dev, "Malformed 'clock-output-names' property\n"); return (ENXIO); } *name = strdup(out_names[0], M_OFWPROP); OF_prop_free(out_names); return (0); } #endif static int clkdom_sysctl(SYSCTL_HANDLER_ARGS) { struct clkdom *clkdom = arg1; struct clknode *clknode; struct sbuf *sb; int ret; sb = sbuf_new_for_sysctl(NULL, NULL, 4096, req); if (sb == NULL) return (ENOMEM); CLK_TOPO_SLOCK(); TAILQ_FOREACH(clknode, &clkdom->clknode_list, clkdom_link) { sbuf_printf(sb, "%s ", clknode->name); } CLK_TOPO_UNLOCK(); ret = sbuf_finish(sb); sbuf_delete(sb); return (ret); } static int clknode_sysctl(SYSCTL_HANDLER_ARGS) { struct clknode *clknode, *children; enum clknode_sysctl_type type = arg2; struct sbuf *sb; const char **parent_names; int ret, i; clknode = arg1; sb = sbuf_new_for_sysctl(NULL, NULL, 512, req); if (sb == NULL) return (ENOMEM); CLK_TOPO_SLOCK(); switch (type) { case CLKNODE_SYSCTL_PARENT: if (clknode->parent) sbuf_printf(sb, "%s", clknode->parent->name); break; case CLKNODE_SYSCTL_PARENTS_LIST: parent_names = clknode_get_parent_names(clknode); for (i = 0; i < clknode->parent_cnt; i++) sbuf_printf(sb, "%s ", parent_names[i]); break; case CLKNODE_SYSCTL_CHILDREN_LIST: TAILQ_FOREACH(children, &(clknode->children), sibling_link) { sbuf_printf(sb, "%s ", children->name); } break; } CLK_TOPO_UNLOCK(); ret = sbuf_finish(sb); sbuf_delete(sb); return (ret); }