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Subject[PATCH v4 4/7] clk: bcm281xx: initialize CCU structures statically
Date
We know up front how many CCU's we'll support, so there's no need to
allocate their data structures dynamically. Define a macro
KONA_CCU_COMMON() to simplify the initialization of many of the
fields in a ccu_data structure. Pass the address of a statically
defined CCU structure to kona_dt_ccu_setup() rather than having that
function allocate one.

We also know at build time how many clocks a given CCU will provide,
though the number of of them for each CCU is different. Record the
number of clocks we need in the CCU's clk_onecell_data struct
(which is used when we register the CCU with the common clock code
as a clock provider). Rename that struct field "clk_data" (because
"data" alone gets a little confusing).

Use the known clock count to move the allocation of each CCU's
clocks array into ccu_clks_setup() rather than having each CCU's
setup callback function do it.

(The real motivation behind all of this is that we'll be doing some
static initialization of some additional CCU-specific data soon.)

Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/clk/bcm/clk-bcm281xx.c | 144 +++++++++++++++-----------------------
drivers/clk/bcm/clk-kona-setup.c | 47 ++++++-------
drivers/clk/bcm/clk-kona.c | 4 +-
drivers/clk/bcm/clk-kona.h | 21 ++++--
4 files changed, 97 insertions(+), 119 deletions(-)

diff --git a/drivers/clk/bcm/clk-bcm281xx.c b/drivers/clk/bcm/clk-bcm281xx.c
index bb947af..d72f2ae 100644
--- a/drivers/clk/bcm/clk-bcm281xx.c
+++ b/drivers/clk/bcm/clk-bcm281xx.c
@@ -15,6 +15,9 @@
#include "clk-kona.h"
#include "dt-bindings/clock/bcm281xx.h"

+#define BCM281XX_CCU_COMMON(_name, _ucase_name) \
+ KONA_CCU_COMMON(BCM281XX, _name, _ucase_name)
+
/*
* These are the bcm281xx CCU device tree "compatible" strings.
* We're stuck with using "bcm11351" in the string because wild
@@ -27,7 +30,7 @@
#define BCM281XX_DT_MASTER_CCU_COMPAT "brcm,bcm11351-master-ccu"
#define BCM281XX_DT_SLAVE_CCU_COMPAT "brcm,bcm11351-slave-ccu"

-/* Root CCU clocks */
+/* Root CCU */

static struct peri_clk_data frac_1m_data = {
.gate = HW_SW_GATE(0x214, 16, 0, 1),
@@ -36,7 +39,11 @@ static struct peri_clk_data frac_1m_data = {
.clocks = CLOCKS("ref_crystal"),
};

-/* AON CCU clocks */
+static struct ccu_data root_ccu_data = {
+ BCM281XX_CCU_COMMON(root, ROOT),
+};
+
+/* AON CCU */

static struct peri_clk_data hub_timer_data = {
.gate = HW_SW_GATE(0x0414, 16, 0, 1),
@@ -65,7 +72,11 @@ static struct peri_clk_data pmu_bsc_var_data = {
.trig = TRIGGER(0x0a40, 2),
};

-/* Hub CCU clocks */
+static struct ccu_data aon_ccu_data = {
+ BCM281XX_CCU_COMMON(aon, AON),
+};
+
+/* Hub CCU */

static struct peri_clk_data tmon_1m_data = {
.gate = HW_SW_GATE(0x04a4, 18, 2, 3),
@@ -75,7 +86,11 @@ static struct peri_clk_data tmon_1m_data = {
.trig = TRIGGER(0x0e84, 1),
};

-/* Master CCU clocks */
+static struct ccu_data hub_ccu_data = {
+ BCM281XX_CCU_COMMON(hub, HUB),
+};
+
+/* Master CCU */

static struct peri_clk_data sdio1_data = {
.gate = HW_SW_GATE(0x0358, 18, 2, 3),
@@ -158,7 +173,11 @@ static struct peri_clk_data hsic2_12m_data = {
.trig = TRIGGER(0x0afc, 5),
};

-/* Slave CCU clocks */
+static struct ccu_data master_ccu_data = {
+ BCM281XX_CCU_COMMON(master, MASTER),
+};
+
+/* Slave CCU */

static struct peri_clk_data uartb_data = {
.gate = HW_SW_GATE(0x0400, 18, 2, 3),
@@ -266,6 +285,10 @@ static struct peri_clk_data pwm_data = {
.trig = TRIGGER(0x0afc, 15),
};

+static struct ccu_data slave_ccu_data = {
+ BCM281XX_CCU_COMMON(slave, SLAVE),
+};
+
/*
* CCU setup routines
*
@@ -277,107 +300,52 @@ static struct peri_clk_data pwm_data = {
*/
static int __init bcm281xx_root_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_ROOT_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate root clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_ROOT_CCU_FRAC_1M, frac_1m);
+ PERI_CLK_SETUP(ccu, BCM281XX_ROOT_CCU_FRAC_1M, frac_1m);

return 0;
}

static int __init bcm281xx_aon_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_AON_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate aon clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_HUB_TIMER, hub_timer);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_PMU_BSC, pmu_bsc);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_PMU_BSC_VAR, pmu_bsc_var);
+ PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_HUB_TIMER, hub_timer);
+ PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_PMU_BSC, pmu_bsc);
+ PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_PMU_BSC_VAR, pmu_bsc_var);

return 0;
}

static int __init bcm281xx_hub_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_HUB_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate hub clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_HUB_CCU_TMON_1M, tmon_1m);
+ PERI_CLK_SETUP(ccu, BCM281XX_HUB_CCU_TMON_1M, tmon_1m);

return 0;
}

static int __init bcm281xx_master_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_MASTER_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate master clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO1, sdio1);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO2, sdio2);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO3, sdio3);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO4, sdio4);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_USB_IC, usb_ic);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_HSIC2_48M, hsic2_48m);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_HSIC2_12M, hsic2_12m);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO1, sdio1);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO2, sdio2);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO3, sdio3);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO4, sdio4);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_USB_IC, usb_ic);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_HSIC2_48M, hsic2_48m);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_HSIC2_12M, hsic2_12m);

return 0;
}

static int __init bcm281xx_slave_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_SLAVE_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate slave clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB, uartb);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB2, uartb2);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB3, uartb3);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB4, uartb4);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_SSP0, ssp0);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_SSP2, ssp2);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC1, bsc1);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC2, bsc2);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC3, bsc3);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_PWM, pwm);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB, uartb);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB2, uartb2);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB3, uartb3);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB4, uartb4);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_SSP0, ssp0);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_SSP2, ssp2);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC1, bsc1);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC2, bsc2);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC3, bsc3);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_PWM, pwm);

return 0;
}
@@ -386,27 +354,29 @@ static int __init bcm281xx_slave_ccu_clks_setup(struct ccu_data *ccu)

static void __init kona_dt_root_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_root_ccu_clks_setup);
+ kona_dt_ccu_setup(&root_ccu_data, node, bcm281xx_root_ccu_clks_setup);
}

static void __init kona_dt_aon_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_aon_ccu_clks_setup);
+ kona_dt_ccu_setup(&aon_ccu_data, node, bcm281xx_aon_ccu_clks_setup);
}

static void __init kona_dt_hub_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_hub_ccu_clks_setup);
+ kona_dt_ccu_setup(&hub_ccu_data, node, bcm281xx_hub_ccu_clks_setup);
}

static void __init kona_dt_master_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_master_ccu_clks_setup);
+ kona_dt_ccu_setup(&master_ccu_data, node,
+ bcm281xx_master_ccu_clks_setup);
}

static void __init kona_dt_slave_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_slave_ccu_clks_setup);
+ kona_dt_ccu_setup(&slave_ccu_data, node,
+ bcm281xx_slave_ccu_clks_setup);
}

CLK_OF_DECLARE(bcm281xx_root_ccu, BCM281XX_DT_ROOT_CCU_COMPAT,
diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c
index 9e7a9c1..4d1ca53 100644
--- a/drivers/clk/bcm/clk-kona-setup.c
+++ b/drivers/clk/bcm/clk-kona-setup.c
@@ -675,50 +675,49 @@ static void ccu_clks_teardown(struct ccu_data *ccu)
{
u32 i;

- for (i = 0; i < ccu->data.clk_num; i++)
- kona_clk_teardown(ccu->data.clks[i]);
- kfree(ccu->data.clks);
+ for (i = 0; i < ccu->clk_data.clk_num; i++)
+ kona_clk_teardown(ccu->clk_data.clks[i]);
+ kfree(ccu->clk_data.clks);
}

static void kona_ccu_teardown(struct ccu_data *ccu)
{
- if (!ccu)
- return;
-
+ kfree(ccu->clk_data.clks);
+ ccu->clk_data.clks = NULL;
if (!ccu->base)
- goto done;
+ return;

of_clk_del_provider(ccu->node); /* safe if never added */
ccu_clks_teardown(ccu);
list_del(&ccu->links);
of_node_put(ccu->node);
+ ccu->node = NULL;
iounmap(ccu->base);
-done:
- kfree(ccu->name);
- kfree(ccu);
+ ccu->base = NULL;
}

/*
* Set up a CCU. Call the provided ccu_clks_setup callback to
* initialize the array of clocks provided by the CCU.
*/
-void __init kona_dt_ccu_setup(struct device_node *node,
+void __init kona_dt_ccu_setup(struct ccu_data *ccu,
+ struct device_node *node,
int (*ccu_clks_setup)(struct ccu_data *))
{
- struct ccu_data *ccu;
struct resource res = { 0 };
resource_size_t range;
int ret;

- ccu = kzalloc(sizeof(*ccu), GFP_KERNEL);
- if (ccu)
- ccu->name = kstrdup(node->name, GFP_KERNEL);
- if (!ccu || !ccu->name) {
- pr_err("%s: unable to allocate CCU struct for %s\n",
- __func__, node->name);
- kfree(ccu);
+ if (ccu->clk_data.clk_num) {
+ size_t size;

- return;
+ size = ccu->clk_data.clk_num * sizeof(*ccu->clk_data.clks);
+ ccu->clk_data.clks = kzalloc(size, GFP_KERNEL);
+ if (!ccu->clk_data.clks) {
+ pr_err("%s: unable to allocate %u clocks for %s\n",
+ __func__, ccu->clk_data.clk_num, node->name);
+ return;
+ }
}

ret = of_address_to_resource(node, 0, &res);
@@ -742,18 +741,14 @@ void __init kona_dt_ccu_setup(struct device_node *node,
node->name);
goto out_err;
}
-
- spin_lock_init(&ccu->lock);
- INIT_LIST_HEAD(&ccu->links);
ccu->node = of_node_get(node);
-
list_add_tail(&ccu->links, &ccu_list);

- /* Set up clocks array (in ccu->data) */
+ /* Set up clocks array (in ccu->clk_data) */
if (ccu_clks_setup(ccu))
goto out_err;

- ret = of_clk_add_provider(node, of_clk_src_onecell_get, &ccu->data);
+ ret = of_clk_add_provider(node, of_clk_src_onecell_get, &ccu->clk_data);
if (ret) {
pr_err("%s: error adding ccu %s as provider (%d)\n", __func__,
node->name, ret);
diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
index bf0b70e..f8bc6bc 100644
--- a/drivers/clk/bcm/clk-kona.c
+++ b/drivers/clk/bcm/clk-kona.c
@@ -1020,13 +1020,13 @@ bool __init kona_ccu_init(struct ccu_data *ccu)
{
unsigned long flags;
unsigned int which;
- struct clk **clks = ccu->data.clks;
+ struct clk **clks = ccu->clk_data.clks;
bool success = true;

flags = ccu_lock(ccu);
__ccu_write_enable(ccu);

- for (which = 0; which < ccu->data.clk_num; which++) {
+ for (which = 0; which < ccu->clk_data.clk_num; which++) {
struct kona_clk *bcm_clk;

if (!clks[which])
diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
index 1a7eba4..108c264 100644
--- a/drivers/clk/bcm/clk-kona.h
+++ b/drivers/clk/bcm/clk-kona.h
@@ -85,11 +85,20 @@ struct ccu_data {
bool write_enabled; /* write access is currently enabled */
struct list_head links; /* for ccu_list */
struct device_node *node;
- struct clk_onecell_data data;
+ struct clk_onecell_data clk_data;
const char *name;
u32 range; /* byte range of address space */
};

+/* Initialization for common fields in a Kona ccu_data structure */
+#define KONA_CCU_COMMON(_prefix, _name, _ucase_name) \
+ .name = #_name "_ccu", \
+ .lock = __SPIN_LOCK_UNLOCKED(_name ## _ccu_data.lock), \
+ .links = LIST_HEAD_INIT(_name ## _ccu_data.links), \
+ .clk_data = { \
+ .clk_num = _prefix ## _ ## _ucase_name ## _CCU_CLOCK_COUNT, \
+ }
+
/*
* Gating control and status is managed by a 32-bit gate register.
*
@@ -390,8 +399,11 @@ extern struct clk_ops kona_peri_clk_ops;

/* Help functions */

-#define PERI_CLK_SETUP(clks, ccu, id, name) \
- clks[id] = kona_clk_setup(ccu, #name, bcm_clk_peri, &name ## _data)
+#define KONA_CLK_SETUP(_ccu, _type, _name) \
+ kona_clk_setup((_ccu), #_name, bcm_clk_## _type, &_name ## _data)
+
+#define PERI_CLK_SETUP(_ccu, _id, _name) \
+ (_ccu)->clk_data.clks[_id] = KONA_CLK_SETUP((_ccu), peri, _name)

/* Externally visible functions */

@@ -402,7 +414,8 @@ extern u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value,

extern struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
enum bcm_clk_type type, void *data);
-extern void __init kona_dt_ccu_setup(struct device_node *node,
+extern void __init kona_dt_ccu_setup(struct ccu_data *ccu,
+ struct device_node *node,
int (*ccu_clks_setup)(struct ccu_data *));
extern bool __init kona_ccu_init(struct ccu_data *ccu);

--
1.7.9.5


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