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ARM: OMAP2+: hwmod: populate clkctrl clocks for hwmods if available 

If clkctrl clocks are available on a device, populate these automatically
to replace hwmod main_clk info. First, the patch parses all "ti,clkctrl"
compatible nodes and maps these against existing clockdomain data. Once
done, individual hwmod init routines can search for a clkctrl clock
handle based on the clockdomain info and the created mapping.

This patch also drops the obsolete "_mod_ck" search as the implementation
required for this was not accepted usptream.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tero Kristo 2017-05-31 18:00:03 +03:00 committed by Tony Lindgren
parent 308b4e381b
commit 70f05be321
1 changed files with 130 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

145
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -141,6 +141,7 @@
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/bootmem.h>
#include <asm/system_misc.h>
@ -181,6 +182,24 @@
*/
#define MOD_CLK_MAX_NAME_LEN 32
/**
* struct clkctrl_provider - clkctrl provider mapping data
* @addr: base address for the provider
* @offset: base offset for the provider
* @clkdm: base clockdomain for provider
* @node: device node associated with the provider
* @link: list link
*/
struct clkctrl_provider {
u32 addr;
u16 offset;
struct clockdomain *clkdm;
struct device_node *node;
struct list_head link;
};
static LIST_HEAD(clkctrl_providers);
/**
* struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
* @enable_module: function to enable a module (via MODULEMODE)
@ -204,6 +223,8 @@ struct omap_hwmod_soc_ops {
void (*update_context_lost)(struct omap_hwmod *oh);
int (*get_context_lost)(struct omap_hwmod *oh);
int (*disable_direct_prcm)(struct omap_hwmod *oh);
u32 (*xlate_clkctrl)(struct omap_hwmod *oh,
struct clkctrl_provider *provider);
};
/* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
@ -690,6 +711,103 @@ static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
return clkdm_del_sleepdep(clkdm, init_clkdm);
}
static const struct of_device_id ti_clkctrl_match_table[] __initconst = {
{ .compatible = "ti,clkctrl" },
{ }
};
static int _match_clkdm(struct clockdomain *clkdm, void *user)
{
struct clkctrl_provider *provider = user;
if (clkdm_xlate_address(clkdm) == provider->addr) {
pr_debug("%s: Matched clkdm %s for addr %x (%s)\n", __func__,
clkdm->name, provider->addr,
provider->node->parent->name);
provider->clkdm = clkdm;
return -1;
}
return 0;
}
static int _setup_clkctrl_provider(struct device_node *np)
{
const __be32 *addrp;
struct clkctrl_provider *provider;
provider = memblock_virt_alloc(sizeof(*provider), 0);
if (!provider)
return -ENOMEM;
addrp = of_get_address(np, 0, NULL, NULL);
provider->addr = (u32)of_translate_address(np, addrp);
provider->offset = provider->addr & 0xff;
provider->addr &= ~0xff;
provider->node = np;
clkdm_for_each(_match_clkdm, provider);
if (!provider->clkdm) {
pr_err("%s: nothing matched for node %s (%x)\n",
__func__, np->parent->name, provider->addr);
memblock_free_early(__pa(provider), sizeof(*provider));
return -EINVAL;
}
list_add(&provider->link, &clkctrl_providers);
return 0;
}
static int _init_clkctrl_providers(void)
{
struct device_node *np;
int ret = 0;
for_each_matching_node(np, ti_clkctrl_match_table) {
ret = _setup_clkctrl_provider(np);
if (ret)
break;
}
return ret;
}
static u32 _omap4_xlate_clkctrl(struct omap_hwmod *oh,
struct clkctrl_provider *provider)
{
return oh->prcm.omap4.clkctrl_offs -
provider->offset - provider->clkdm->clkdm_offs;
}
static struct clk *_lookup_clkctrl_clk(struct omap_hwmod *oh)
{
struct clkctrl_provider *provider;
struct clk *clk;
if (!soc_ops.xlate_clkctrl)
return NULL;
list_for_each_entry(provider, &clkctrl_providers, link) {
if (provider->clkdm == oh->clkdm) {
struct of_phandle_args clkspec;
clkspec.np = provider->node;
clkspec.args_count = 2;
clkspec.args[0] = soc_ops.xlate_clkctrl(oh, provider);
clkspec.args[1] = 0;
clk = of_clk_get_from_provider(&clkspec);
return clk;
}
}
return NULL;
}
/**
* _init_main_clk - get a struct clk * for the the hwmod's main functional clk
* @oh: struct omap_hwmod *
@ -701,22 +819,16 @@ static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
static int _init_main_clk(struct omap_hwmod *oh)
{
int ret = 0;
char name[MOD_CLK_MAX_NAME_LEN];
struct clk *clk;
static const char modck[] = "_mod_ck";
struct clk *clk = NULL;
if (strlen(oh->name) >= MOD_CLK_MAX_NAME_LEN - strlen(modck))
pr_warn("%s: warning: cropping name for %s\n", __func__,
oh->name);
clk = _lookup_clkctrl_clk(oh);
strlcpy(name, oh->name, MOD_CLK_MAX_NAME_LEN - strlen(modck));
strlcat(name, modck, MOD_CLK_MAX_NAME_LEN);
clk = clk_get(NULL, name);
if (!IS_ERR(clk)) {
if (!IS_ERR_OR_NULL(clk)) {
pr_debug("%s: mapped main_clk %s for %s\n", __func__,
__clk_get_name(clk), oh->name);
oh->main_clk = __clk_get_name(clk);
oh->_clk = clk;
soc_ops.disable_direct_prcm(oh);
oh->main_clk = kstrdup(name, GFP_KERNEL);
} else {
if (!oh->main_clk)
return 0;
@ -1482,13 +1594,13 @@ static int _init_clkdm(struct omap_hwmod *oh)
* _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
* well the clockdomain.
* @oh: struct omap_hwmod *
* @data: not used; pass NULL
* @np: device_node mapped to this hwmod
*
* Called by omap_hwmod_setup_*() (after omap2_clk_init()).
* Resolves all clock names embedded in the hwmod. Returns 0 on
* success, or a negative error code on failure.
*/
static int _init_clocks(struct omap_hwmod *oh, void *data)
static int _init_clocks(struct omap_hwmod *oh, struct device_node *np)
{
int ret = 0;
@ -2360,7 +2472,7 @@ static int __init _init(struct omap_hwmod *oh, void *data)
return 0;
}
r = _init_clocks(oh, NULL);
r = _init_clocks(oh, np);
if (r < 0) {
WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
return -EINVAL;
@ -3722,6 +3834,7 @@ void __init omap_hwmod_init(void)
soc_ops.update_context_lost = _omap4_update_context_lost;
soc_ops.get_context_lost = _omap4_get_context_lost;
soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
} else if (cpu_is_ti814x() || cpu_is_ti816x() || soc_is_am33xx() ||
soc_is_am43xx()) {
soc_ops.enable_module = _omap4_enable_module;
@ -3736,6 +3849,8 @@ void __init omap_hwmod_init(void)
WARN(1, "omap_hwmod: unknown SoC type\n");
}
_init_clkctrl_providers();
inited = true;
}