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path: root/drivers/clk/qcom/clk-alpha-pll.c
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Diffstat (limited to 'drivers/clk/qcom/clk-alpha-pll.c')
-rw-r--r--drivers/clk/qcom/clk-alpha-pll.c302
1 files changed, 295 insertions, 7 deletions
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 6d04cd96482a..3c49a60072f1 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015, 2018, The Linux Foundation. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
@@ -58,6 +58,8 @@
#define PLL_TEST_CTL(p) ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL])
#define PLL_TEST_CTL_U(p) ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL_U])
#define PLL_STATUS(p) ((p)->offset + (p)->regs[PLL_OFF_STATUS])
+#define PLL_OPMODE(p) ((p)->offset + (p)->regs[PLL_OFF_OPMODE])
+#define PLL_FRAC(p) ((p)->offset + (p)->regs[PLL_OFF_FRAC])
const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = {
[CLK_ALPHA_PLL_TYPE_DEFAULT] = {
@@ -90,6 +92,18 @@ const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = {
[PLL_OFF_TEST_CTL] = 0x1c,
[PLL_OFF_STATUS] = 0x24,
},
+ [CLK_ALPHA_PLL_TYPE_FABIA] = {
+ [PLL_OFF_L_VAL] = 0x04,
+ [PLL_OFF_USER_CTL] = 0x0c,
+ [PLL_OFF_USER_CTL_U] = 0x10,
+ [PLL_OFF_CONFIG_CTL] = 0x14,
+ [PLL_OFF_CONFIG_CTL_U] = 0x18,
+ [PLL_OFF_TEST_CTL] = 0x1c,
+ [PLL_OFF_TEST_CTL_U] = 0x20,
+ [PLL_OFF_STATUS] = 0x24,
+ [PLL_OFF_OPMODE] = 0x2c,
+ [PLL_OFF_FRAC] = 0x38,
+ },
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);
@@ -108,6 +122,12 @@ EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);
#define PLL_HUAYRA_N_MASK 0xff
#define PLL_HUAYRA_ALPHA_WIDTH 16
+#define FABIA_OPMODE_STANDBY 0x0
+#define FABIA_OPMODE_RUN 0x1
+
+#define FABIA_PLL_OUT_MASK 0x7
+#define FABIA_PLL_RATE_MARGIN 500
+
#define pll_alpha_width(p) \
((PLL_ALPHA_VAL_U(p) - PLL_ALPHA_VAL(p) == 4) ? \
ALPHA_REG_BITWIDTH : ALPHA_REG_16BIT_WIDTH)
@@ -441,16 +461,12 @@ clk_alpha_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
return alpha_pll_calc_rate(prate, l, a, alpha_width);
}
-static int clk_alpha_pll_update_latch(struct clk_alpha_pll *pll,
- int (*is_enabled)(struct clk_hw *))
+
+static int __clk_alpha_pll_update_latch(struct clk_alpha_pll *pll)
{
int ret;
u32 mode;
- if (!is_enabled(&pll->clkr.hw) ||
- !(pll->flags & SUPPORTS_DYNAMIC_UPDATE))
- return 0;
-
regmap_read(pll->clkr.regmap, PLL_MODE(pll), &mode);
/* Latch the input to the PLL */
@@ -489,6 +505,16 @@ static int clk_alpha_pll_update_latch(struct clk_alpha_pll *pll,
return 0;
}
+static int clk_alpha_pll_update_latch(struct clk_alpha_pll *pll,
+ int (*is_enabled)(struct clk_hw *))
+{
+ if (!is_enabled(&pll->clkr.hw) ||
+ !(pll->flags & SUPPORTS_DYNAMIC_UPDATE))
+ return 0;
+
+ return __clk_alpha_pll_update_latch(pll);
+}
+
static int __clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long prate,
int (*is_enabled)(struct clk_hw *))
@@ -832,3 +858,265 @@ const struct clk_ops clk_alpha_pll_postdiv_ro_ops = {
.recalc_rate = clk_alpha_pll_postdiv_recalc_rate,
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_ro_ops);
+
+void clk_fabia_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
+ const struct alpha_pll_config *config)
+{
+ u32 val, mask;
+
+ if (config->l)
+ regmap_write(regmap, PLL_L_VAL(pll), config->l);
+
+ if (config->alpha)
+ regmap_write(regmap, PLL_FRAC(pll), config->alpha);
+
+ if (config->config_ctl_val)
+ regmap_write(regmap, PLL_CONFIG_CTL(pll),
+ config->config_ctl_val);
+
+ if (config->post_div_mask) {
+ mask = config->post_div_mask;
+ val = config->post_div_val;
+ regmap_update_bits(regmap, PLL_USER_CTL(pll), mask, val);
+ }
+
+ regmap_update_bits(regmap, PLL_MODE(pll), PLL_UPDATE_BYPASS,
+ PLL_UPDATE_BYPASS);
+
+ regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, PLL_RESET_N);
+}
+EXPORT_SYMBOL_GPL(clk_fabia_pll_configure);
+
+static int alpha_pll_fabia_enable(struct clk_hw *hw)
+{
+ int ret;
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ u32 val, opmode_val;
+ struct regmap *regmap = pll->clkr.regmap;
+
+ ret = regmap_read(regmap, PLL_MODE(pll), &val);
+ if (ret)
+ return ret;
+
+ /* If in FSM mode, just vote for it */
+ if (val & PLL_VOTE_FSM_ENA) {
+ ret = clk_enable_regmap(hw);
+ if (ret)
+ return ret;
+ return wait_for_pll_enable_active(pll);
+ }
+
+ ret = regmap_read(regmap, PLL_OPMODE(pll), &opmode_val);
+ if (ret)
+ return ret;
+
+ /* Skip If PLL is already running */
+ if ((opmode_val & FABIA_OPMODE_RUN) && (val & PLL_OUTCTRL))
+ return 0;
+
+ ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N,
+ PLL_RESET_N);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_RUN);
+ if (ret)
+ return ret;
+
+ ret = wait_for_pll_enable_lock(pll);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
+ FABIA_PLL_OUT_MASK, FABIA_PLL_OUT_MASK);
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL,
+ PLL_OUTCTRL);
+}
+
+static void alpha_pll_fabia_disable(struct clk_hw *hw)
+{
+ int ret;
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ u32 val;
+ struct regmap *regmap = pll->clkr.regmap;
+
+ ret = regmap_read(regmap, PLL_MODE(pll), &val);
+ if (ret)
+ return;
+
+ /* If in FSM mode, just unvote it */
+ if (val & PLL_FSM_ENA) {
+ clk_disable_regmap(hw);
+ return;
+ }
+
+ ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0);
+ if (ret)
+ return;
+
+ /* Disable main outputs */
+ ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), FABIA_PLL_OUT_MASK,
+ 0);
+ if (ret)
+ return;
+
+ /* Place the PLL in STANDBY */
+ regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY);
+}
+
+static unsigned long alpha_pll_fabia_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ u32 l, frac, alpha_width = pll_alpha_width(pll);
+
+ regmap_read(pll->clkr.regmap, PLL_L_VAL(pll), &l);
+ regmap_read(pll->clkr.regmap, PLL_FRAC(pll), &frac);
+
+ return alpha_pll_calc_rate(parent_rate, l, frac, alpha_width);
+}
+
+static int alpha_pll_fabia_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long prate)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ u32 val, l, alpha_width = pll_alpha_width(pll);
+ u64 a;
+ unsigned long rrate;
+ int ret = 0;
+
+ ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val);
+ if (ret)
+ return ret;
+
+ rrate = alpha_pll_round_rate(rate, prate, &l, &a, alpha_width);
+
+ /*
+ * Due to limited number of bits for fractional rate programming, the
+ * rounded up rate could be marginally higher than the requested rate.
+ */
+ if (rrate > (rate + FABIA_PLL_RATE_MARGIN) || rrate < rate) {
+ pr_err("Call set rate on the PLL with rounded rates!\n");
+ return -EINVAL;
+ }
+
+ regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
+ regmap_write(pll->clkr.regmap, PLL_FRAC(pll), a);
+
+ return __clk_alpha_pll_update_latch(pll);
+}
+
+const struct clk_ops clk_alpha_pll_fabia_ops = {
+ .enable = alpha_pll_fabia_enable,
+ .disable = alpha_pll_fabia_disable,
+ .is_enabled = clk_alpha_pll_is_enabled,
+ .set_rate = alpha_pll_fabia_set_rate,
+ .recalc_rate = alpha_pll_fabia_recalc_rate,
+ .round_rate = clk_alpha_pll_round_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_fabia_ops);
+
+const struct clk_ops clk_alpha_pll_fixed_fabia_ops = {
+ .enable = alpha_pll_fabia_enable,
+ .disable = alpha_pll_fabia_disable,
+ .is_enabled = clk_alpha_pll_is_enabled,
+ .recalc_rate = alpha_pll_fabia_recalc_rate,
+ .round_rate = clk_alpha_pll_round_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_fixed_fabia_ops);
+
+static unsigned long clk_alpha_pll_postdiv_fabia_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw);
+ u32 i, div = 1, val;
+ int ret;
+
+ if (!pll->post_div_table) {
+ pr_err("Missing the post_div_table for the PLL\n");
+ return -EINVAL;
+ }
+
+ ret = regmap_read(pll->clkr.regmap, PLL_USER_CTL(pll), &val);
+ if (ret)
+ return ret;
+
+ val >>= pll->post_div_shift;
+ val &= BIT(pll->width) - 1;
+
+ for (i = 0; i < pll->num_post_div; i++) {
+ if (pll->post_div_table[i].val == val) {
+ div = pll->post_div_table[i].div;
+ break;
+ }
+ }
+
+ return (parent_rate / div);
+}
+
+static long clk_alpha_pll_postdiv_fabia_round_rate(struct clk_hw *hw,
+ unsigned long rate, unsigned long *prate)
+{
+ struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw);
+
+ if (!pll->post_div_table) {
+ pr_err("Missing the post_div_table for the PLL\n");
+ return -EINVAL;
+ }
+
+ return divider_round_rate(hw, rate, prate, pll->post_div_table,
+ pll->width, CLK_DIVIDER_ROUND_CLOSEST);
+}
+
+static int clk_alpha_pll_postdiv_fabia_set_rate(struct clk_hw *hw,
+ unsigned long rate, unsigned long parent_rate)
+{
+ struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw);
+ int i, val = 0, div, ret;
+
+ /*
+ * If the PLL is in FSM mode, then treat set_rate callback as a
+ * no-operation.
+ */
+ ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val);
+ if (ret)
+ return ret;
+
+ if (val & PLL_VOTE_FSM_ENA)
+ return 0;
+
+ if (!pll->post_div_table) {
+ pr_err("Missing the post_div_table for the PLL\n");
+ return -EINVAL;
+ }
+
+ div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
+ for (i = 0; i < pll->num_post_div; i++) {
+ if (pll->post_div_table[i].div == div) {
+ val = pll->post_div_table[i].val;
+ break;
+ }
+ }
+
+ return regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll),
+ (BIT(pll->width) - 1) << pll->post_div_shift,
+ val << pll->post_div_shift);
+}
+
+const struct clk_ops clk_alpha_pll_postdiv_fabia_ops = {
+ .recalc_rate = clk_alpha_pll_postdiv_fabia_recalc_rate,
+ .round_rate = clk_alpha_pll_postdiv_fabia_round_rate,
+ .set_rate = clk_alpha_pll_postdiv_fabia_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_fabia_ops);