static int qoriq_cpufreq_cpu_init()

in qoriq-cpufreq.c [155:226]

• 57 lines of code
• 7 McCabe index (conditional complexity)

static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
	struct device_node *np;
	int i, count;
	u32 freq;
	struct clk *clk;
	const struct clk_hw *hwclk;
	struct cpufreq_frequency_table *table;
	struct cpu_data *data;
	unsigned int cpu = policy->cpu;
	u64 u64temp;

	np = of_get_cpu_node(cpu, NULL);
	if (!np)
		return -ENODEV;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		goto err_np;

	policy->clk = of_clk_get(np, 0);
	if (IS_ERR(policy->clk)) {
		pr_err("%s: no clock information\n", __func__);
		goto err_nomem2;
	}

	hwclk = __clk_get_hw(policy->clk);
	count = clk_hw_get_num_parents(hwclk);

	data->pclk = kcalloc(count, sizeof(struct clk *), GFP_KERNEL);
	if (!data->pclk)
		goto err_nomem2;

	table = kcalloc(count + 1, sizeof(*table), GFP_KERNEL);
	if (!table)
		goto err_pclk;

	for (i = 0; i < count; i++) {
		clk = clk_hw_get_parent_by_index(hwclk, i)->clk;
		data->pclk[i] = clk;
		freq = clk_get_rate(clk);
		table[i].frequency = freq / 1000;
		table[i].driver_data = i;
	}
	freq_table_redup(table, count);
	freq_table_sort(table, count);
	table[i].frequency = CPUFREQ_TABLE_END;
	policy->freq_table = table;
	data->table = table;

	/* update ->cpus if we have cluster, no harm if not */
	set_affected_cpus(policy);
	policy->driver_data = data;

	/* Minimum transition latency is 12 platform clocks */
	u64temp = 12ULL * NSEC_PER_SEC;
	do_div(u64temp, get_bus_freq());
	policy->cpuinfo.transition_latency = u64temp + 1;

	of_node_put(np);

	return 0;

err_pclk:
	kfree(data->pclk);
err_nomem2:
	kfree(data);
err_np:
	of_node_put(np);

	return -ENODEV;
}