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path: root/drivers/clk/bcm/clk-kona.h
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Diffstat (limited to 'drivers/clk/bcm/clk-kona.h')
-rw-r--r--drivers/clk/bcm/clk-kona.h160
1 files changed, 133 insertions, 27 deletions
diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
index dee690951bb..2537b307291 100644
--- a/drivers/clk/bcm/clk-kona.h
+++ b/drivers/clk/bcm/clk-kona.h
@@ -43,8 +43,14 @@
#define FLAG_FLIP(obj, type, flag) ((obj)->flags ^= FLAG(type, flag))
#define FLAG_TEST(obj, type, flag) (!!((obj)->flags & FLAG(type, flag)))
+/* CCU field state tests */
+
+#define ccu_policy_exists(ccu_policy) ((ccu_policy)->enable.offset != 0)
+
/* Clock field state tests */
+#define policy_exists(policy) ((policy)->offset != 0)
+
#define gate_exists(gate) FLAG_TEST(gate, GATE, EXISTS)
#define gate_is_enabled(gate) FLAG_TEST(gate, GATE, ENABLED)
#define gate_is_hw_controllable(gate) FLAG_TEST(gate, GATE, HW)
@@ -54,6 +60,8 @@
#define gate_flip_enabled(gate) FLAG_FLIP(gate, GATE, ENABLED)
+#define hyst_exists(hyst) ((hyst)->offset != 0)
+
#define divider_exists(div) FLAG_TEST(div, DIV, EXISTS)
#define divider_is_fixed(div) FLAG_TEST(div, DIV, FIXED)
#define divider_has_fraction(div) (!divider_is_fixed(div) && \
@@ -62,6 +70,9 @@
#define selector_exists(sel) ((sel)->width != 0)
#define trigger_exists(trig) FLAG_TEST(trig, TRIG, EXISTS)
+#define policy_lvm_en_exists(enable) ((enable)->offset != 0)
+#define policy_ctl_exists(control) ((control)->offset != 0)
+
/* Clock type, used to tell common block what it's part of */
enum bcm_clk_type {
bcm_clk_none, /* undefined clock type */
@@ -71,25 +82,26 @@ enum bcm_clk_type {
};
/*
- * Each CCU defines a mapped area of memory containing registers
- * used to manage clocks implemented by the CCU. Access to memory
- * within the CCU's space is serialized by a spinlock. Before any
- * (other) address can be written, a special access "password" value
- * must be written to its WR_ACCESS register (located at the base
- * address of the range). We keep track of the name of each CCU as
- * it is set up, and maintain them in a list.
+ * CCU policy control for clocks. Clocks can be enabled or disabled
+ * based on the CCU policy in effect. One bit in each policy mask
+ * register (one per CCU policy) represents whether the clock is
+ * enabled when that policy is effect or not. The CCU policy engine
+ * must be stopped to update these bits, and must be restarted again
+ * afterward.
*/
-struct ccu_data {
- void __iomem *base; /* base of mapped address space */
- spinlock_t lock; /* serialization lock */
- bool write_enabled; /* write access is currently enabled */
- struct list_head links; /* for ccu_list */
- struct device_node *node;
- struct clk_onecell_data data;
- const char *name;
- u32 range; /* byte range of address space */
+struct bcm_clk_policy {
+ u32 offset; /* first policy mask register offset */
+ u32 bit; /* bit used in all mask registers */
};
+/* Policy initialization macro */
+
+#define POLICY(_offset, _bit) \
+ { \
+ .offset = (_offset), \
+ .bit = (_bit), \
+ }
+
/*
* Gating control and status is managed by a 32-bit gate register.
*
@@ -195,6 +207,22 @@ struct bcm_clk_gate {
.flags = FLAG(GATE, HW)|FLAG(GATE, EXISTS), \
}
+/* Gate hysteresis for clocks */
+struct bcm_clk_hyst {
+ u32 offset; /* hyst register offset (normally CLKGATE) */
+ u32 en_bit; /* bit used to enable hysteresis */
+ u32 val_bit; /* if enabled: 0 = low delay; 1 = high delay */
+};
+
+/* Hysteresis initialization macro */
+
+#define HYST(_offset, _en_bit, _val_bit) \
+ { \
+ .offset = (_offset), \
+ .en_bit = (_en_bit), \
+ .val_bit = (_val_bit), \
+ }
+
/*
* Each clock can have zero, one, or two dividers which change the
* output rate of the clock. Each divider can be either fixed or
@@ -360,7 +388,9 @@ struct bcm_clk_trig {
}
struct peri_clk_data {
+ struct bcm_clk_policy policy;
struct bcm_clk_gate gate;
+ struct bcm_clk_hyst hyst;
struct bcm_clk_trig pre_trig;
struct bcm_clk_div pre_div;
struct bcm_clk_trig trig;
@@ -373,8 +403,7 @@ struct peri_clk_data {
struct kona_clk {
struct clk_hw hw;
- struct clk_init_data init_data;
- const char *name; /* name of this clock */
+ struct clk_init_data init_data; /* includes name of this clock */
struct ccu_data *ccu; /* ccu this clock is associated with */
enum bcm_clk_type type;
union {
@@ -385,14 +414,92 @@ struct kona_clk {
#define to_kona_clk(_hw) \
container_of(_hw, struct kona_clk, hw)
-/* Exported globals */
+/* Initialization macro for an entry in a CCU's kona_clks[] array. */
+#define KONA_CLK(_ccu_name, _clk_name, _type) \
+ { \
+ .init_data = { \
+ .name = #_clk_name, \
+ .ops = &kona_ ## _type ## _clk_ops, \
+ }, \
+ .ccu = &_ccu_name ## _ccu_data, \
+ .type = bcm_clk_ ## _type, \
+ .u.data = &_clk_name ## _data, \
+ }
+#define LAST_KONA_CLK { .type = bcm_clk_none }
-extern struct clk_ops kona_peri_clk_ops;
+/*
+ * CCU policy control. To enable software update of the policy
+ * tables the CCU policy engine must be stopped by setting the
+ * software update enable bit (LVM_EN). After an update the engine
+ * is restarted using the GO bit and either the GO_ATL or GO_AC bit.
+ */
+struct bcm_lvm_en {
+ u32 offset; /* LVM_EN register offset */
+ u32 bit; /* POLICY_CONFIG_EN bit in register */
+};
+
+/* Policy enable initialization macro */
+#define CCU_LVM_EN(_offset, _bit) \
+ { \
+ .offset = (_offset), \
+ .bit = (_bit), \
+ }
+
+struct bcm_policy_ctl {
+ u32 offset; /* POLICY_CTL register offset */
+ u32 go_bit;
+ u32 atl_bit; /* GO, GO_ATL, and GO_AC bits */
+ u32 ac_bit;
+};
+
+/* Policy control initialization macro */
+#define CCU_POLICY_CTL(_offset, _go_bit, _ac_bit, _atl_bit) \
+ { \
+ .offset = (_offset), \
+ .go_bit = (_go_bit), \
+ .ac_bit = (_ac_bit), \
+ .atl_bit = (_atl_bit), \
+ }
+
+struct ccu_policy {
+ struct bcm_lvm_en enable;
+ struct bcm_policy_ctl control;
+};
+
+/*
+ * Each CCU defines a mapped area of memory containing registers
+ * used to manage clocks implemented by the CCU. Access to memory
+ * within the CCU's space is serialized by a spinlock. Before any
+ * (other) address can be written, a special access "password" value
+ * must be written to its WR_ACCESS register (located at the base
+ * address of the range). We keep track of the name of each CCU as
+ * it is set up, and maintain them in a list.
+ */
+struct ccu_data {
+ void __iomem *base; /* base of mapped address space */
+ spinlock_t lock; /* serialization lock */
+ bool write_enabled; /* write access is currently enabled */
+ struct ccu_policy policy;
+ struct list_head links; /* for ccu_list */
+ struct device_node *node;
+ struct clk_onecell_data clk_data;
+ const char *name;
+ u32 range; /* byte range of address space */
+ struct kona_clk kona_clks[]; /* must be last */
+};
-/* Help functions */
+/* Initialization for common fields in a Kona ccu_data structure */
+#define KONA_CCU_COMMON(_prefix, _name, _ccuname) \
+ .name = #_name "_ccu", \
+ .lock = __SPIN_LOCK_UNLOCKED(_name ## _ccu_data.lock), \
+ .links = LIST_HEAD_INIT(_name ## _ccu_data.links), \
+ .clk_data = { \
+ .clk_num = _prefix ## _ ## _ccuname ## _CCU_CLOCK_COUNT, \
+ }
+
+/* Exported globals */
-#define PERI_CLK_SETUP(clks, ccu, id, name) \
- clks[id] = kona_clk_setup(ccu, #name, bcm_clk_peri, &name ## _data)
+extern struct clk_ops kona_peri_clk_ops;
/* Externally visible functions */
@@ -401,10 +508,9 @@ extern u64 scaled_div_max(struct bcm_clk_div *div);
extern u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value,
u32 billionths);
-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,
- int (*ccu_clks_setup)(struct ccu_data *));
+extern struct clk *kona_clk_setup(struct kona_clk *bcm_clk);
+extern void __init kona_dt_ccu_setup(struct ccu_data *ccu,
+ struct device_node *node);
extern bool __init kona_ccu_init(struct ccu_data *ccu);
#endif /* _CLK_KONA_H */