clk: qcom: clk-alpha-pll: Add support for controlling Regera PLLs (00aae456) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/clk/qcom/clk-alpha-pll.c

+226 −3

Original line number	Diff line number	Diff line
		@@ -87,6 +87,17 @@

		#define XO_RATE 19200000

		/* REGERA PLL specific settings and offsets */
		#define REGERA_PLL_USER_CTL 0xc
		#define REGERA_PLL_CONFIG_CTL 0x10
		#define REGERA_PLL_CONFIG_CTL_U 0x14
		#define REGERA_PLL_CONFIG_CTL_U1 0x18
		#define REGERA_PLL_OPMODE 0x28

		#define REGERA_PLL_OFF 0x0
		#define REGERA_PLL_RUN 0x1
		#define REGERA_PLL_OUT_MASK 0x9

		#define to_clk_alpha_pll(_hw) container_of(to_clk_regmap(_hw), \
		struct clk_alpha_pll, clkr)

		@@ -134,6 +145,9 @@ static int wait_for_pll(struct clk_alpha_pll *pll, u32 mask, bool inverse,
		#define wait_for_pll_offline(pll) \
		wait_for_pll(pll, PLL_OFFLINE_ACK, 0, "offline")

		#define wait_for_regera_pll_freq_lock(pll) \
		wait_for_pll(pll, PLL_LOCK_DET, 0, "lock after rate change")

		void clk_alpha_pll_configure(struct clk_alpha_pll pll, struct regmap regmap,
		const struct alpha_pll_config *config)
		{
		@@ -336,7 +350,7 @@ static unsigned long alpha_pll_calc_rate(const struct clk_alpha_pll *pll,
		{
		int alpha_bw = ALPHA_BITWIDTH;

		if (pll->type == TRION_PLL)
		if (pll->type == TRION_PLL \|\| pll->type == REGERA_PLL)
		alpha_bw = TRION_PLL_BITWIDTH;

		return (prate * l) + ((prate * a) >> alpha_bw);
		@@ -369,7 +383,7 @@ alpha_pll_round_rate(const struct clk_alpha_pll *pll, unsigned long rate,
		}

		/* Trion PLLs only have 16 bits to program the fractional divider */
		if (pll->type == TRION_PLL)
		if (pll->type == TRION_PLL \|\| pll->type == REGERA_PLL)
		alpha_bw = TRION_PLL_BITWIDTH;

		/* Upper ALPHA_BITWIDTH bits of Alpha */
		@@ -466,7 +480,7 @@ static long clk_alpha_pll_round_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long min_freq, max_freq;

		rate = alpha_pll_round_rate(pll, rate, *prate, &l, &a);
		if (pll->type != TRION_PLL && alpha_pll_find_vco(pll, rate))
		if (pll->type == ALPHA_PLL && alpha_pll_find_vco(pll, rate))
		return rate;

		min_freq = pll->vco_table[0].min_freq;
		@@ -819,6 +833,204 @@ static void clk_trion_pll_list_registers(struct seq_file f, struct clk_hw hw)
		&pll_vote_reg);
		}

		int clk_regera_pll_configure(struct clk_alpha_pll pll, struct regmap regmap,
		const struct alpha_pll_config *config)
		{
		if (config->alpha)
		regmap_write(regmap, pll->offset + PLL_ALPHA_VAL,
		config->alpha);

		if (config->l)
		regmap_write(regmap, pll->offset + PLL_L_VAL, config->l);

		if (config->config_ctl_val)
		regmap_write(regmap, pll->offset + REGERA_PLL_CONFIG_CTL,
		config->config_ctl_val);

		if (config->config_ctl_hi_val)
		regmap_write(regmap, pll->offset + REGERA_PLL_CONFIG_CTL_U,
		config->config_ctl_hi_val);

		if (config->config_ctl_hi1_val)
		regmap_write(regmap, pll->offset + REGERA_PLL_CONFIG_CTL_U1,
		config->config_ctl_hi1_val);

		if (config->post_div_mask)
		regmap_update_bits(regmap, pll->offset + REGERA_PLL_USER_CTL,
		config->post_div_mask, config->post_div_val);

		/* Set operation mode to OFF */
		regmap_write(regmap, pll->offset + REGERA_PLL_OPMODE, REGERA_PLL_OFF);

		/* PLL should be in OFF mode before continuing */
		wmb();

		pll->inited = true;
		return 0;
		}

		static int clk_regera_pll_enable(struct clk_hw *hw)
		{
		int ret;
		struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
		u32 val, off = pll->offset;

		ret = regmap_read(pll->clkr.regmap, off + PLL_MODE, &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);
		}

		if (unlikely(!pll->inited)) {
		ret = clk_regera_pll_configure(pll, pll->clkr.regmap,
		pll->config);
		if (ret) {
		pr_err("Failed to configure %s\n", clk_hw_get_name(hw));
		return ret;
		}
		}

		/* Get the PLL out of bypass mode */
		ret = regmap_update_bits(pll->clkr.regmap, off + PLL_MODE,
		PLL_BYPASSNL, PLL_BYPASSNL);
		if (ret)
		return ret;

		/*
		* H/W requires a 1us delay between disabling the bypass and
		* de-asserting the reset.
		*/
		mb();
		udelay(1);

		ret = regmap_update_bits(pll->clkr.regmap, off + PLL_MODE,
		PLL_RESET_N, PLL_RESET_N);
		if (ret)
		return ret;

		/* Set operation mode to RUN */
		regmap_write(pll->clkr.regmap, off + REGERA_PLL_OPMODE,
		REGERA_PLL_RUN);

		ret = wait_for_pll_enable_lock(pll);
		if (ret)
		return ret;

		/* Enable the PLL outputs */
		ret = regmap_update_bits(pll->clkr.regmap, off + REGERA_PLL_USER_CTL,
		REGERA_PLL_OUT_MASK, REGERA_PLL_OUT_MASK);
		if (ret)
		return ret;

		/* Enable the global PLL outputs */
		ret = regmap_update_bits(pll->clkr.regmap, off + PLL_MODE,
		PLL_OUTCTRL, PLL_OUTCTRL);
		if (ret)
		return ret;

		/* Ensure that the write above goes through before returning. */
		mb();
		return ret;
		}

		static void clk_regera_pll_disable(struct clk_hw *hw)
		{
		int ret;
		struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
		u32 val, mask, off = pll->offset;

		ret = regmap_read(pll->clkr.regmap, off + PLL_MODE, &val);
		if (ret)
		return;

		/* If in FSM mode, just unvote it */
		if (val & PLL_VOTE_FSM_ENA) {
		clk_disable_regmap(hw);
		return;
		}

		/* Disable the global PLL output */
		ret = regmap_update_bits(pll->clkr.regmap, off + PLL_MODE,
		PLL_OUTCTRL, 0);
		if (ret)
		return;

		/* Disable the PLL outputs */
		ret = regmap_update_bits(pll->clkr.regmap, off + REGERA_PLL_USER_CTL,
		REGERA_PLL_OUT_MASK, 0);

		/* Put the PLL in bypass and reset */
		mask = PLL_RESET_N \| PLL_BYPASSNL;
		ret = regmap_update_bits(pll->clkr.regmap, off + PLL_MODE, mask, 0);
		if (ret)
		return;

		/* Place the PLL mode in OFF state */
		regmap_write(pll->clkr.regmap, off + REGERA_PLL_OPMODE,
		REGERA_PLL_OFF);
		}

		static int clk_regera_pll_set_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long prate)
		{
		struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
		unsigned long rrate;
		u32 regval, l, off = pll->offset;
		u64 a;
		int ret;

		rrate = alpha_pll_round_rate(pll, rate, prate, &l, &a);
		/*
		* Due to a limited number of bits for fractional rate programming, the
		* rounded up rate could be marginally higher than the requested rate.
		*/
		if (rrate > (rate + TRION_PLL_RATE_MARGIN) \|\| rrate < rate) {
		pr_err("Requested rate (%lu) not matching the PLL's supported frequency (%lu)\n",
		rate, rrate);
		return -EINVAL;
		}

		regmap_write(pll->clkr.regmap, off + PLL_ALPHA_VAL, a);
		regmap_write(pll->clkr.regmap, off + PLL_L_VAL, l);

		/* Wait before polling for the frequency latch */
		udelay(5);

		ret = wait_for_regera_pll_freq_lock(pll);
		if (ret)
		return ret;

		/* Wait for PLL output to stabilize */
		udelay(100);
		return 0;
		}


		static void clk_regera_pll_list_registers(struct seq_file f, struct clk_hw hw)
		{
		static struct clk_register_data pll_regs[] = {
		{"PLL_MODE", 0x0},
		{"PLL_L_VAL", 0x4},
		{"PLL_ALPHA_VAL", 0x8},
		{"PLL_USER_CTL", 0xC},
		{"PLL_CONFIG_CTL", 0x10},
		{"PLL_OPMODE", 0x28},
		};

		static struct clk_register_data pll_vote_reg = {
		"APSS_PLL_VOTE", 0x0
		};

		print_pll_registers(f, hw, pll_regs, ARRAY_SIZE(pll_regs),
		&pll_vote_reg);
		}

		const struct clk_ops clk_alpha_pll_ops = {
		.enable = clk_alpha_pll_enable,
		.disable = clk_alpha_pll_disable,
		@@ -863,6 +1075,17 @@ const struct clk_ops clk_trion_fixed_pll_ops = {
		};
		EXPORT_SYMBOL_GPL(clk_trion_fixed_pll_ops);

		const struct clk_ops clk_regera_pll_ops = {
		.enable = clk_regera_pll_enable,
		.disable = clk_regera_pll_disable,
		.is_enabled = clk_alpha_pll_is_enabled,
		.recalc_rate = clk_alpha_pll_recalc_rate,
		.round_rate = clk_alpha_pll_round_rate,
		.set_rate = clk_regera_pll_set_rate,
		.list_registers = clk_regera_pll_list_registers,
		};
		EXPORT_SYMBOL_GPL(clk_regera_pll_ops);

		static unsigned long
		clk_alpha_pll_postdiv_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
		{

drivers/clk/qcom/clk-alpha-pll.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@ struct pll_vco {
		enum pll_type {
		ALPHA_PLL,
		TRION_PLL,
		REGERA_PLL,
		};

		/**
		@@ -93,10 +94,13 @@ extern const struct clk_ops clk_alpha_pll_postdiv_ops;
		extern const struct clk_ops clk_trion_pll_ops;
		extern const struct clk_ops clk_trion_fixed_pll_ops;
		extern const struct clk_ops clk_trion_pll_postdiv_ops;
		extern const struct clk_ops clk_regera_pll_ops;

		void clk_alpha_pll_configure(struct clk_alpha_pll pll, struct regmap regmap,
		const struct alpha_pll_config *config);
		int clk_trion_pll_configure(struct clk_alpha_pll pll, struct regmap regmap,
		const struct alpha_pll_config *config);
		int clk_regera_pll_configure(struct clk_alpha_pll pll, struct regmap regmap,
		const struct alpha_pll_config *config);

		#endif