ARM: OMAP2+: Remove mostly unused hwmod linkspace

We want to be able to dynamically allocate struct omap_hwmod_ocp_if and
struct omap_hwmod at device driver probe time based on .dts data.

Current setup with the linkspace using memblock_virt_alloc() makes
this tricky, so let's get rid of struct linkspace and directly set up
struct omap_hwmod_ocp_if as the master and slave lists.

As we are currently not using the master_ports either, let's remove it
too. And let's add the struct omap_hwmod_ocp_if node directly to the
slave_ports list.

Signed-off-by: Tony Lindgren <tony@atomide.com>

2 files changed, 4 insertions, 125 deletions

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 0da4f2ea76c4..7b7ba6d48e83 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -138,7 +138,6 @@
 #include <linux/mutex.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
-#include <linux/bootmem.h>
 #include <linux/cpu.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
@@ -216,20 +215,6 @@ static LIST_HEAD(omap_hwmod_list);
 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
 static struct omap_hwmod *mpu_oh;
 
-/*
- * linkspace: ptr to a buffer that struct omap_hwmod_link records are
- * allocated from - used to reduce the number of small memory
- * allocations, which has a significant impact on performance
- */
-static struct omap_hwmod_link *linkspace;
-
-/*
- * free_ls, max_ls: array indexes into linkspace; representing the
- * next free struct omap_hwmod_link index, and the maximum number of
- * struct omap_hwmod_link records allocated (respectively)
- */
-static unsigned short free_ls, max_ls, ls_supp;
-
 /* inited: set to true once the hwmod code is initialized */
 static bool inited;
 
@@ -250,7 +235,7 @@ static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p,
 {
         struct omap_hwmod_ocp_if *oi;
 
-        oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if;
+        oi = list_entry(*p, struct omap_hwmod_ocp_if, node);
         *p = (*p)->next;
 
         *i = *i + 1;
@@ -2657,7 +2642,6 @@ static int __init _register(struct omap_hwmod *oh)
 
         list_add_tail(&oh->node, &omap_hwmod_list);
 
-        INIT_LIST_HEAD(&oh->master_ports);
         INIT_LIST_HEAD(&oh->slave_ports);
         spin_lock_init(&oh->_lock);
         lockdep_set_class(&oh->_lock, &oh->hwmod_key);
@@ -2675,49 +2659,10 @@ static int __init _register(struct omap_hwmod *oh)
 }
 
 /**
- * _alloc_links - return allocated memory for hwmod links
- * @ml: pointer to a struct omap_hwmod_link * for the master link
- * @sl: pointer to a struct omap_hwmod_link * for the slave link
- *
- * Return pointers to two struct omap_hwmod_link records, via the
- * addresses pointed to by @ml and @sl.  Will first attempt to return
- * memory allocated as part of a large initial block, but if that has
- * been exhausted, will allocate memory itself.  Since ideally this
- * second allocation path will never occur, the number of these
- * 'supplemental' allocations will be logged when debugging is
- * enabled.  Returns 0.
- */
-static int __init _alloc_links(struct omap_hwmod_link **ml,
-                               struct omap_hwmod_link **sl)
-{
-        unsigned int sz;
-
-        if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
-                *ml = &linkspace[free_ls++];
-                *sl = &linkspace[free_ls++];
-                return 0;
-        }
-
-        sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
-
-        *sl = NULL;
-        *ml = memblock_virt_alloc(sz, 0);
-
-        *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
-
-        ls_supp++;
-        pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
-                 ls_supp * LINKS_PER_OCP_IF);
-
-        return 0;
-};
-
-/**
  * _add_link - add an interconnect between two IP blocks
  * @oi: pointer to a struct omap_hwmod_ocp_if record
  *
- * Add struct omap_hwmod_link records connecting the master IP block
- * specified in @oi->master to @oi, and connecting the slave IP block
+ * Add struct omap_hwmod_link records connecting the slave IP block
  * specified in @oi->slave to @oi.  This code is assumed to run before
  * preemption or SMP has been enabled, thus avoiding the need for
  * locking in this code.  Changes to this assumption will require
@@ -2725,19 +2670,10 @@ static int __init _alloc_links(struct omap_hwmod_link **ml,
  */
 static int __init _add_link(struct omap_hwmod_ocp_if *oi)
 {
-        struct omap_hwmod_link *ml, *sl;
-
         pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
                  oi->slave->name);
 
-        _alloc_links(&ml, &sl);
-
-        ml->ocp_if = oi;
-        list_add(&ml->node, &oi->master->master_ports);
-        oi->master->masters_cnt++;
-
-        sl->ocp_if = oi;
-        list_add(&sl->node, &oi->slave->slave_ports);
+        list_add(&oi->node, &oi->slave->slave_ports);
         oi->slave->slaves_cnt++;
 
         return 0;
@@ -2784,45 +2720,6 @@ static int __init _register_link(struct omap_hwmod_ocp_if *oi)
         return 0;
 }
 
-/**
- * _alloc_linkspace - allocate large block of hwmod links
- * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
- *
- * Allocate a large block of struct omap_hwmod_link records.  This
- * improves boot time significantly by avoiding the need to allocate
- * individual records one by one.  If the number of records to
- * allocate in the block hasn't been manually specified, this function
- * will count the number of struct omap_hwmod_ocp_if records in @ois
- * and use that to determine the allocation size.  For SoC families
- * that require multiple list registrations, such as OMAP3xxx, this
- * estimation process isn't optimal, so manual estimation is advised
- * in those cases.  Returns -EEXIST if the allocation has already occurred
- * or 0 upon success.
- */
-static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
-{
-        unsigned int i = 0;
-        unsigned int sz;
-
-        if (linkspace) {
-                WARN(1, "linkspace already allocated\n");
-                return -EEXIST;
-        }
-
-        if (max_ls == 0)
-                while (ois[i++])
-                        max_ls += LINKS_PER_OCP_IF;
-
-        sz = sizeof(struct omap_hwmod_link) * max_ls;
-
-        pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
-                 __func__, sz, max_ls);
-
-        linkspace = memblock_virt_alloc(sz, 0);
-
-        return 0;
-}
-
 /* Static functions intended only for use in soc_ops field function pointers */
 
 /**
@@ -3180,13 +3077,6 @@ int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
         if (ois[0] == NULL) /* Empty list */
                 return 0;
 
-        if (!linkspace) {
-                if (_alloc_linkspace(ois)) {
-                        pr_err("omap_hwmod: could not allocate link space\n");
-                        return -ENOMEM;
-                }
-        }
-
         i = 0;
         do {
                 r = _register_link(ois[i]);
diff --git a/arch/arm/mach-omap2/omap_hwmod.h b/arch/arm/mach-omap2/omap_hwmod.h
index 78904017f18c..03d5560d0ecd 100644
--- a/arch/arm/mach-omap2/omap_hwmod.h
+++ b/arch/arm/mach-omap2/omap_hwmod.h
@@ -313,6 +313,7 @@ struct omap_hwmod_ocp_if {
         struct omap_hwmod_addr_space    *addr;
         const char                      *clk;
         struct clk                      *_clk;
+        struct list_head                node;
         union {
                 struct omap_hwmod_omap2_firewall omap2;
         }                               fw;
@@ -617,16 +618,6 @@ struct omap_hwmod_class {
 };
 
 /**
- * struct omap_hwmod_link - internal structure linking hwmods with ocp_ifs
- * @ocp_if: OCP interface structure record pointer
- * @node: list_head pointing to next struct omap_hwmod_link in a list
- */
-struct omap_hwmod_link {
-        struct omap_hwmod_ocp_if        *ocp_if;
-        struct list_head                node;
-};
-
-/**
  * struct omap_hwmod - integration data for OMAP hardware "modules" (IP blocks)
  * @name: name of the hwmod
  * @class: struct omap_hwmod_class * to the class of this hwmod
@@ -688,7 +679,6 @@ struct omap_hwmod {
         struct omap_hwmod_opt_clk       *opt_clks;
         char                            *clkdm_name;
         struct clockdomain              *clkdm;
-        struct list_head                master_ports; /* connect to *_IA */
         struct list_head                slave_ports; /* connect to *_TA */
         void                            *dev_attr;
         u32                             _sysc_cache;
@@ -703,7 +693,6 @@ struct omap_hwmod {
         u8                              response_lat;
         u8                              rst_lines_cnt;
         u8                              opt_clks_cnt;
-        u8                              masters_cnt;
         u8                              slaves_cnt;
         u8                              hwmods_cnt;
         u8                              _int_flags;