ARM: keystone2: Cleanup PLL init code

There are two types of PLL for all keystone platforms:
Main PLL, Secondary PLL. Instead of duplicating the same definition
for each secondary PLL, have a common function which does
initialization for both PLLs. And also add proper register
definitions.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

1 files changed, 135 insertions, 166 deletions

diff --git a/arch/arm/mach-keystone/clock.c b/arch/arm/mach-keystone/clock.c
index 625907f..b5b66e4 100644
--- a/arch/arm/mach-keystone/clock.c
+++ b/arch/arm/mach-keystone/clock.c
@@ -18,189 +18,171 @@ static void wait_for_completion(const struct pll_init_data *data)
 	int i;
 	for (i = 0; i < 100; i++) {
 		sdelay(450);
-		if ((pllctl_reg_read(data->pll, stat) & PLLSTAT_GO) == 0)
+		if (!(pllctl_reg_read(data->pll, stat) & PLLSTAT_GOSTAT_MASK))
 			break;
 	}
 }
 
-void init_pll(const struct pll_init_data *data)
+static inline void bypass_main_pll(const struct pll_init_data *data)
 {
-	u32 tmp, tmp_ctl, pllm, plld, pllod, bwadj;
+	pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLENSRC_MASK |
+			   PLLCTL_PLLEN_MASK);
+
+	/* 4 cycles of reference clock CLKIN*/
+	sdelay(340);
+}
+
+static void configure_mult_div(const struct pll_init_data *data)
+{
+	u32 pllm, plld, bwadj;
 
 	pllm = data->pll_m - 1;
-	plld = (data->pll_d - 1) & PLL_DIV_MASK;
-	pllod = (data->pll_od - 1) & PLL_CLKOD_MASK;
+	plld = (data->pll_d - 1) & CFG_PLLCTL0_PLLD_MASK;
 
-	if (data->pll == MAIN_PLL) {
-		/* The requered delay before main PLL configuration */
-		sdelay(210000);
+	/* Program Multiplier */
+	if (data->pll == MAIN_PLL)
+		pllctl_reg_write(data->pll, mult, pllm & PLLM_MULT_LO_MASK);
 
-		tmp = pllctl_reg_read(data->pll, secctl);
+	clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
+			CFG_PLLCTL0_PLLM_MASK,
+			pllm << CFG_PLLCTL0_PLLM_SHIFT);
+
+	/* Program BWADJ */
+	bwadj = (data->pll_m - 1) >> 1; /* Divide pllm by 2 */
+	clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
+			CFG_PLLCTL0_BWADJ_MASK,
+			(bwadj << CFG_PLLCTL0_BWADJ_SHIFT) &
+			CFG_PLLCTL0_BWADJ_MASK);
+	bwadj = bwadj >> CFG_PLLCTL0_BWADJ_BITS;
+	clrsetbits_le32(keystone_pll_regs[data->pll].reg1,
+			CFG_PLLCTL1_BWADJ_MASK, bwadj);
+
+	/* Program Divider */
+	clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
+			CFG_PLLCTL0_PLLD_MASK, plld);
+}
 
-		if (tmp & (PLLCTL_BYPASS)) {
-			setbits_le32(keystone_pll_regs[data->pll].reg1,
-				     BIT(MAIN_ENSAT_OFFSET));
+void configure_main_pll(const struct pll_init_data *data)
+{
+	u32 tmp, pllod, i, alnctl_val = 0;
+	u32 *offset;
 
-			pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLEN |
-					   PLLCTL_PLLENSRC);
-			sdelay(340);
+	pllod = data->pll_od - 1;
 
-			pllctl_reg_setbits(data->pll, secctl, PLLCTL_BYPASS);
-			pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLPWRDN);
-			sdelay(21000);
+	/* 100 micro sec for stabilization */
+	sdelay(210000);
 
-			pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLPWRDN);
-		} else {
-			pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLEN |
-					   PLLCTL_PLLENSRC);
-			sdelay(340);
-		}
+	tmp = pllctl_reg_read(data->pll, secctl);
 
-		pllctl_reg_write(data->pll, mult, pllm & PLLM_MULT_LO_MASK);
+	/* Check for Bypass */
+	if (tmp & SECCTL_BYPASS_MASK) {
+		setbits_le32(keystone_pll_regs[data->pll].reg1,
+			     CFG_PLLCTL1_ENSAT_MASK);
 
-		clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
-				PLLM_MULT_HI_SMASK, (pllm << 6));
+		bypass_main_pll(data);
 
-		/* Set the BWADJ     (12 bit field)  */
-		tmp_ctl = pllm >> 1; /* Divide the pllm by 2 */
-		clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
-				PLL_BWADJ_LO_SMASK,
-				(tmp_ctl << PLL_BWADJ_LO_SHIFT));
-		clrsetbits_le32(keystone_pll_regs[data->pll].reg1,
-				PLL_BWADJ_HI_MASK,
-				(tmp_ctl >> 8));
+		/* Powerdown and powerup Main Pll */
+		pllctl_reg_setbits(data->pll, secctl, SECCTL_BYPASS_MASK);
+		pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLPWRDN_MASK);
+		/* 5 micro sec */
+		sdelay(21000);
 
-		/*
-		 * Set the pll divider (6 bit field) *
-		 * PLLD[5:0] is located in MAINPLLCTL0
-		 */
-		clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
-				PLL_DIV_MASK, plld);
+		pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLPWRDN_MASK);
+	} else {
+		bypass_main_pll(data);
+	}
 
-		/* Set the OUTPUT DIVIDE (4 bit field) in SECCTL */
-		pllctl_reg_rmw(data->pll, secctl, PLL_CLKOD_SMASK,
-			       (pllod << PLL_CLKOD_SHIFT));
-		wait_for_completion(data);
+	configure_mult_div(data);
 
-		pllctl_reg_write(data->pll, div1, PLLM_RATIO_DIV1);
-		pllctl_reg_write(data->pll, div2, PLLM_RATIO_DIV2);
-		pllctl_reg_write(data->pll, div3, PLLM_RATIO_DIV3);
-		pllctl_reg_write(data->pll, div4, PLLM_RATIO_DIV4);
-		pllctl_reg_write(data->pll, div5, PLLM_RATIO_DIV5);
+	/* Program Output Divider */
+	pllctl_reg_rmw(data->pll, secctl, SECCTL_OP_DIV_MASK,
+		       ((pllod << SECCTL_OP_DIV_SHIFT) & SECCTL_OP_DIV_MASK));
 
-		pllctl_reg_setbits(data->pll, alnctl, 0x1f);
+	/* Program PLLDIVn */
+	wait_for_completion(data);
+	for (i = 0; i < PLLDIV_MAX; i++) {
+		if (i < 3)
+			offset = pllctl_reg(data->pll, div1) + i;
+		else
+			offset = pllctl_reg(data->pll, div4) + (i - 3);
 
+		if (divn_val[i] != -1) {
+			__raw_writel(divn_val[i] | PLLDIV_ENABLE_MASK, offset);
+			alnctl_val |= BIT(i);
+		}
+	}
+
+	if (alnctl_val) {
+		pllctl_reg_setbits(data->pll, alnctl, alnctl_val);
 		/*
 		 * Set GOSET bit in PLLCMD to initiate the GO operation
 		 * to change the divide
 		 */
-		pllctl_reg_setbits(data->pll, cmd, PLLSTAT_GO);
-		sdelay(1500); /* wait for the phase adj */
+		pllctl_reg_setbits(data->pll, cmd, PLLSTAT_GOSTAT_MASK);
 		wait_for_completion(data);
+	}
 
-		/* Reset PLL */
-		pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLRST);
-		sdelay(21000);	/* Wait for a minimum of 7 us*/
-		pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLRST);
-		sdelay(105000);	/* Wait for PLL Lock time (min 50 us) */
-
-		pllctl_reg_clrbits(data->pll, secctl, PLLCTL_BYPASS);
-
-		tmp = pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLEN);
+	/* Reset PLL */
+	pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLRST_MASK);
+	sdelay(21000);	/* Wait for a minimum of 7 us*/
+	pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLRST_MASK);
+	sdelay(105000);	/* Wait for PLL Lock time (min 50 us) */
 
-#ifndef CONFIG_SOC_K2E
-	} else if (data->pll == TETRIS_PLL) {
-		bwadj = pllm >> 1;
-		/* 1.5 Set PLLCTL0[BYPASS] =1 (enable bypass), */
-		setbits_le32(keystone_pll_regs[data->pll].reg0,  PLLCTL_BYPASS);
-		/*
-		 * Set CHIPMISCCTL1[13] = 0 (enable glitchfree bypass)
-		 * only applicable for Kepler
-		 */
-		clrbits_le32(KS2_MISC_CTRL, KS2_ARM_PLL_EN);
-		/* 2 In PLLCTL1, write PLLRST = 1 (PLL is reset) */
-		setbits_le32(keystone_pll_regs[data->pll].reg1 ,
-			     PLL_PLLRST | PLLCTL_ENSAT);
-
-		/*
-		 * 3 Program PLLM and PLLD in PLLCTL0 register
-		 * 4 Program BWADJ[7:0] in PLLCTL0 and BWADJ[11:8] in
-		 * PLLCTL1 register. BWADJ value must be set
-		 * to ((PLLM + 1) >> 1) – 1)
-		 */
-		tmp = ((bwadj & PLL_BWADJ_LO_MASK) << PLL_BWADJ_LO_SHIFT) |
-			(pllm << 6) |
-			(plld & PLL_DIV_MASK) |
-			(pllod << PLL_CLKOD_SHIFT) | PLLCTL_BYPASS;
-		__raw_writel(tmp, keystone_pll_regs[data->pll].reg0);
-
-		/* Set BWADJ[11:8] bits */
-		tmp = __raw_readl(keystone_pll_regs[data->pll].reg1);
-		tmp &= ~(PLL_BWADJ_HI_MASK);
-		tmp |= ((bwadj>>8) & PLL_BWADJ_HI_MASK);
-		__raw_writel(tmp, keystone_pll_regs[data->pll].reg1);
-		/*
-		 * 5 Wait for at least 5 us based on the reference
-		 * clock (PLL reset time)
-		 */
-		sdelay(21000);	/* Wait for a minimum of 7 us*/
-
-		/* 6 In PLLCTL1, write PLLRST = 0 (PLL reset is released) */
-		clrbits_le32(keystone_pll_regs[data->pll].reg1, PLL_PLLRST);
-		/*
-		 * 7 Wait for at least 500 * REFCLK cycles * (PLLD + 1)
-		 * (PLL lock time)
-		 */
-		sdelay(105000);
-		/* 8 disable bypass */
-		clrbits_le32(keystone_pll_regs[data->pll].reg0, PLLCTL_BYPASS);
-		/*
-		 * 9 Set CHIPMISCCTL1[13] = 1 (disable glitchfree bypass)
-		 * only applicable for Kepler
-		 */
-		setbits_le32(KS2_MISC_CTRL, KS2_ARM_PLL_EN);
-#endif
-	} else {
-		setbits_le32(keystone_pll_regs[data->pll].reg1, PLLCTL_ENSAT);
-		/*
-		 * process keeps state of Bypass bit while programming
-		 * all other DDR PLL settings
-		 */
-		tmp = __raw_readl(keystone_pll_regs[data->pll].reg0);
-		tmp &= PLLCTL_BYPASS;	/* clear everything except Bypass */
+	/* Enable PLL */
+	pllctl_reg_clrbits(data->pll, secctl, SECCTL_BYPASS_MASK);
+	pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLEN_MASK);
+}
 
-		/*
-		 * Set the BWADJ[7:0], PLLD[5:0] and PLLM to PLLCTL0,
-		 * bypass disabled
-		 */
-		bwadj = pllm >> 1;
-		tmp |= ((bwadj & PLL_BWADJ_LO_MASK) << PLL_BWADJ_LO_SHIFT) |
-			(pllm << PLL_MULT_SHIFT) |
-			(plld & PLL_DIV_MASK) |
-			(pllod << PLL_CLKOD_SHIFT);
-		__raw_writel(tmp, keystone_pll_regs[data->pll].reg0);
-
-		/* Set BWADJ[11:8] bits */
-		tmp = __raw_readl(keystone_pll_regs[data->pll].reg1);
-		tmp &= ~(PLL_BWADJ_HI_MASK);
-		tmp |= ((bwadj >> 8) & PLL_BWADJ_HI_MASK);
-
-		__raw_writel(tmp, keystone_pll_regs[data->pll].reg1);
-
-		/* Reset bit: bit 14 for both DDR3 & PASS PLL */
-		tmp = PLL_PLLRST;
-		/* Set RESET bit = 1 */
-		setbits_le32(keystone_pll_regs[data->pll].reg1, tmp);
-		/* Wait for a minimum of 7 us*/
-		sdelay(21000);
-		/* Clear RESET bit */
-		clrbits_le32(keystone_pll_regs[data->pll].reg1, tmp);
-		sdelay(105000);
+void configure_secondary_pll(const struct pll_init_data *data)
+{
+	int pllod = data->pll_od - 1;
+
+	/* Enable Bypass mode */
+	setbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_ENSAT_MASK);
+	setbits_le32(keystone_pll_regs[data->pll].reg0,
+		     CFG_PLLCTL0_BYPASS_MASK);
+
+	/* Enable Glitch free bypass for ARM PLL */
+	if (cpu_is_k2hk() && data->pll == TETRIS_PLL)
+		clrbits_le32(KS2_MISC_CTRL, MISC_CTL1_ARM_PLL_EN);
+
+	configure_mult_div(data);
+
+	/* Program Output Divider */
+	clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
+			CFG_PLLCTL0_CLKOD_MASK,
+			(pllod << CFG_PLLCTL0_CLKOD_SHIFT) &
+			CFG_PLLCTL0_CLKOD_MASK);
+
+	/* Reset PLL */
+	setbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_RST_MASK);
+	/* Wait for 5 micro seconds */
+	sdelay(21000);
+
+	/* Select the Output of PASS PLL as input to PASS */
+	if (data->pll == PASS_PLL)
+		setbits_le32(keystone_pll_regs[data->pll].reg1,
+			     CFG_PLLCTL1_PAPLL_MASK);
+
+	/* Select the Output of ARM PLL as input to ARM */
+	if (data->pll == TETRIS_PLL)
+		setbits_le32(KS2_MISC_CTRL, MISC_CTL1_ARM_PLL_EN);
+
+	clrbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_RST_MASK);
+	/* Wait for 500 * REFCLK cucles * (PLLD + 1) */
+	sdelay(105000);
+
+	/* Switch to PLL mode */
+	clrbits_le32(keystone_pll_regs[data->pll].reg0,
+		     CFG_PLLCTL0_BYPASS_MASK);
+}
 
-		/* clear BYPASS (Enable PLL Mode) */
-		clrbits_le32(keystone_pll_regs[data->pll].reg0, PLLCTL_BYPASS);
-		sdelay(21000);	/* Wait for a minimum of 7 us*/
-	}
+void init_pll(const struct pll_init_data *data)
+{
+	if (data->pll == MAIN_PLL)
+		configure_main_pll(data);
+	else
+		configure_secondary_pll(data);
 
 	/*
 	 * This is required to provide a delay between multiple
@@ -257,16 +239,3 @@ inline int get_max_dev_speed(void)
 {
 	return get_max_speed((read_efuse_bootrom() >> 16) & 0xffff, dev_speeds);
 }
-
-void pass_pll_pa_clk_enable(void)
-{
-	u32 reg;
-
-	reg = readl(keystone_pll_regs[PASS_PLL].reg1);
-
-	reg |= PLLCTL_PAPLL;
-	writel(reg, keystone_pll_regs[PASS_PLL].reg1);
-
-	/* wait till clock is enabled */
-	sdelay(15000);
-}