static DEFINE_SPINLOCK(clk_lock);
+/* Maximum number of parents our clocks have */
+#define SUNXI_MAX_PARENTS 5
+
/**
* sun4i_osc_clk_setup() - Setup function for gatable oscillator
*/
const char *clk_name = node->name;
u32 rate;
+ if (of_property_read_u32(node, "clock-frequency", &rate))
+ return;
+
/* allocate fixed-rate and gate clock structs */
fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL);
if (!fixed)
return;
gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
- if (!gate) {
- kfree(fixed);
- return;
- }
-
- if (of_property_read_u32(node, "clock-frequency", &rate))
- return;
+ if (!gate)
+ goto err_free_fixed;
/* set up gate and fixed rate properties */
gate->reg = of_iomap(node, 0);
&gate->hw, &clk_gate_ops,
CLK_IS_ROOT);
- if (!IS_ERR(clk)) {
- of_clk_add_provider(node, of_clk_src_simple_get, clk);
- clk_register_clkdev(clk, clk_name, NULL);
- }
+ if (IS_ERR(clk))
+ goto err_free_gate;
+
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ clk_register_clkdev(clk, clk_name, NULL);
+
+ return;
+
+err_free_gate:
+ kfree(gate);
+err_free_fixed:
+ kfree(fixed);
}
CLK_OF_DECLARE(sun4i_osc, "allwinner,sun4i-osc-clk", sun4i_osc_clk_setup);
* sunxi_factors_clk_setup() - Setup function for factor clocks
*/
+#define SUNXI_FACTORS_MUX_MASK 0x3
+
struct factors_data {
+ int enable;
+ int mux;
struct clk_factors_config *table;
void (*getter) (u32 *rate, u32 parent_rate, u8 *n, u8 *k, u8 *m, u8 *p);
};
};
static const struct factors_data sun4i_pll1_data __initconst = {
+ .enable = 31,
.table = &sun4i_pll1_config,
.getter = sun4i_get_pll1_factors,
};
static const struct factors_data sun6i_a31_pll1_data __initconst = {
+ .enable = 31,
.table = &sun6i_a31_pll1_config,
.getter = sun6i_a31_get_pll1_factors,
};
.getter = sun4i_get_apb1_factors,
};
-static void __init sunxi_factors_clk_setup(struct device_node *node,
- struct factors_data *data)
+static struct clk * __init sunxi_factors_clk_setup(struct device_node *node,
+ const struct factors_data *data)
{
struct clk *clk;
+ struct clk_factors *factors;
+ struct clk_gate *gate = NULL;
+ struct clk_mux *mux = NULL;
+ struct clk_hw *gate_hw = NULL;
+ struct clk_hw *mux_hw = NULL;
const char *clk_name = node->name;
- const char *parent;
+ const char *parents[SUNXI_MAX_PARENTS];
void *reg;
+ int i = 0;
reg = of_iomap(node, 0);
- parent = of_clk_get_parent_name(node, 0);
+ /* if we have a mux, we will have >1 parents */
+ while (i < SUNXI_MAX_PARENTS &&
+ (parents[i] = of_clk_get_parent_name(node, i)) != NULL)
+ i++;
+
+ factors = kzalloc(sizeof(struct clk_factors), GFP_KERNEL);
+ if (!factors)
+ return NULL;
+
+ /* Add a gate if this factor clock can be gated */
+ if (data->enable) {
+ gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
+ if (!gate) {
+ kfree(factors);
+ return NULL;
+ }
+
+ /* set up gate properties */
+ gate->reg = reg;
+ gate->bit_idx = data->enable;
+ gate->lock = &clk_lock;
+ gate_hw = &gate->hw;
+ }
+
+ /* Add a mux if this factor clock can be muxed */
+ if (data->mux) {
+ mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);
+ if (!mux) {
+ kfree(factors);
+ kfree(gate);
+ return NULL;
+ }
+
+ /* set up gate properties */
+ mux->reg = reg;
+ mux->shift = data->mux;
+ mux->mask = SUNXI_FACTORS_MUX_MASK;
+ mux->lock = &clk_lock;
+ mux_hw = &mux->hw;
+ }
- clk = clk_register_factors(NULL, clk_name, parent, 0, reg,
- data->table, data->getter, &clk_lock);
+ /* set up factors properties */
+ factors->reg = reg;
+ factors->config = data->table;
+ factors->get_factors = data->getter;
+ factors->lock = &clk_lock;
+
+ clk = clk_register_composite(NULL, clk_name,
+ parents, i,
+ mux_hw, &clk_mux_ops,
+ &factors->hw, &clk_factors_ops,
+ gate_hw, &clk_gate_ops, 0);
if (!IS_ERR(clk)) {
of_clk_add_provider(node, of_clk_src_simple_get, clk);
clk_register_clkdev(clk, clk_name, NULL);
}
+
+ return clk;
}
{
struct clk *clk;
const char *clk_name = node->name;
- const char *parents[5];
+ const char *parents[SUNXI_MAX_PARENTS];
void *reg;
int i = 0;
reg = of_iomap(node, 0);
- while (i < 5 && (parents[i] = of_clk_get_parent_name(node, i)) != NULL)
+ while (i < SUNXI_MAX_PARENTS &&
+ (parents[i] = of_clk_get_parent_name(node, i)) != NULL)
i++;
clk = clk_register_mux(NULL, clk_name, parents, i,
}
}
-static void __init sunxi_init_clocks(struct device_node *np)
+/**
+ * System clock protection
+ *
+ * By enabling these critical clocks, we prevent their accidental gating
+ * by the framework
+ */
+static void __init sunxi_clock_protect(void)
+{
+ struct clk *clk;
+
+ /* memory bus clock - sun5i+ */
+ clk = clk_get(NULL, "mbus");
+ if (!IS_ERR(clk)) {
+ clk_prepare_enable(clk);
+ clk_put(clk);
+ }
+
+ /* DDR clock - sun4i+ */
+ clk = clk_get(NULL, "pll5_ddr");
+ if (!IS_ERR(clk)) {
+ clk_prepare_enable(clk);
+ clk_put(clk);
+ }
+}
+
+static void __init sunxi_init_clocks(void)
{
/* Register factor clocks */
of_sunxi_table_clock_setup(clk_factors_match, sunxi_factors_clk_setup);
/* Register gate clocks */
of_sunxi_table_clock_setup(clk_gates_match, sunxi_gates_clk_setup);
+
+ /* Enable core system clocks */
+ sunxi_clock_protect();
}
CLK_OF_DECLARE(sun4i_a10_clk_init, "allwinner,sun4i-a10", sunxi_init_clocks);
CLK_OF_DECLARE(sun5i_a10s_clk_init, "allwinner,sun5i-a10s", sunxi_init_clocks);
projects / karo-tx-linux.git / blobdiff