*/
#include <linux/module.h>
+#include <linux/regmap.h>
#include "rl6231.h"
/**
- * rl6231_calc_dmic_clk - Calculate the parameter of dmic.
+ * rl6231_get_pre_div - Return the value of pre divider.
+ *
+ * @map: map for setting.
+ * @reg: register.
+ * @sft: shift.
+ *
+ * Return the value of pre divider from given register value.
+ * Return negative error code for unexpected register value.
+ */
+int rl6231_get_pre_div(struct regmap *map, unsigned int reg, int sft)
+{
+ int pd, val;
+
+ regmap_read(map, reg, &val);
+
+ val = (val >> sft) & 0x7;
+
+ switch (val) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ pd = val + 1;
+ break;
+ case 4:
+ pd = 6;
+ break;
+ case 5:
+ pd = 8;
+ break;
+ case 6:
+ pd = 12;
+ break;
+ case 7:
+ pd = 16;
+ break;
+ default:
+ pd = -EINVAL;
+ break;
+ }
+
+ return pd;
+}
+EXPORT_SYMBOL_GPL(rl6231_get_pre_div);
+
+/**
+ * rl6231_calc_dmic_clk - Calculate the frequency divider parameter of dmic.
*
* @rate: base clock rate.
*
- * Choose dmic clock between 1MHz and 3MHz.
- * It is better for clock to approximate 3MHz.
+ * Choose divider parameter that gives the highest possible DMIC frequency in
+ * 1MHz - 3MHz range.
*/
int rl6231_calc_dmic_clk(int rate)
{
- int div[] = {2, 3, 4, 6, 8, 12}, idx = -EINVAL;
- int i, red, bound, temp;
+ int div[] = {2, 3, 4, 6, 8, 12};
+ int i;
+
+ if (rate < 1000000 * div[0]) {
+ pr_warn("Base clock rate %d is too low\n", rate);
+ return -EINVAL;
+ }
- red = 3000000 * 12;
for (i = 0; i < ARRAY_SIZE(div); i++) {
- bound = div[i] * 3000000;
- if (rate > bound)
- continue;
- temp = bound - rate;
- if (temp < red) {
- red = temp;
- idx = i;
- }
+ /* find divider that gives DMIC frequency below 3MHz */
+ if (3000000 * div[i] >= rate)
+ return i;
}
- return idx;
+ pr_warn("Base clock rate %d is too high\n", rate);
+ return -EINVAL;
}
EXPORT_SYMBOL_GPL(rl6231_calc_dmic_clk);
+struct pll_calc_map {
+ unsigned int pll_in;
+ unsigned int pll_out;
+ int k;
+ int n;
+ int m;
+ bool m_bp;
+};
+
+static const struct pll_calc_map pll_preset_table[] = {
+ {19200000, 24576000, 3, 30, 3, false},
+};
+
/**
* rl6231_pll_calc - Calcualte PLL M/N/K code.
* @freq_in: external clock provided to codec.
const unsigned int freq_out, struct rl6231_pll_code *pll_code)
{
int max_n = RL6231_PLL_N_MAX, max_m = RL6231_PLL_M_MAX;
- int k, red, n_t, pll_out, in_t, out_t;
+ int i, k, red, n_t, pll_out, in_t, out_t;
int n = 0, m = 0, m_t = 0;
int red_t = abs(freq_out - freq_in);
bool bypass = false;
if (RL6231_PLL_INP_MAX < freq_in || RL6231_PLL_INP_MIN > freq_in)
return -EINVAL;
+ for (i = 0; i < ARRAY_SIZE(pll_preset_table); i++) {
+ if (freq_in == pll_preset_table[i].pll_in &&
+ freq_out == pll_preset_table[i].pll_out) {
+ k = pll_preset_table[i].k;
+ m = pll_preset_table[i].m;
+ n = pll_preset_table[i].n;
+ bypass = pll_preset_table[i].m_bp;
+ pr_debug("Use preset PLL parameter table\n");
+ goto code_find;
+ }
+ }
+
k = 100000000 / freq_out - 2;
if (k > RL6231_PLL_K_MAX)
k = RL6231_PLL_K_MAX;