clk: aspeed: Add AST2600 clock support

This patch adds the clock control driver
for the AST2600 SoC.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com>

2 files changed, 1174 insertions, 0 deletions

diff --git a/drivers/clk/aspeed/Makefile b/drivers/clk/aspeed/Makefile
index 81764b4391..84776e5265 100644
--- a/drivers/clk/aspeed/Makefile
+++ b/drivers/clk/aspeed/Makefile
@@ -4,3 +4,4 @@
 #
 
 obj-$(CONFIG_ASPEED_AST2500) += clk_ast2500.o
+obj-$(CONFIG_ASPEED_AST2600) += clk_ast2600.o
diff --git a/drivers/clk/aspeed/clk_ast2600.c b/drivers/clk/aspeed/clk_ast2600.c
new file mode 100644
index 0000000000..f72d384047
--- /dev/null
+++ b/drivers/clk/aspeed/clk_ast2600.c
@@ -0,0 +1,1173 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) ASPEED Technology Inc.
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <dm/lists.h>
+#include <linux/delay.h>
+#include <asm/arch/scu_ast2600.h>
+#include <dt-bindings/clock/ast2600-clock.h>
+#include <dt-bindings/reset/ast2600-reset.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define CLKIN_25M 25000000UL
+
+/* MAC Clock Delay settings */
+#define MAC12_DEF_DELAY_1G		0x0041b75d
+#define MAC12_DEF_DELAY_100M	0x00417410
+#define MAC12_DEF_DELAY_10M		0x00417410
+#define MAC34_DEF_DELAY_1G		0x0010438a
+#define MAC34_DEF_DELAY_100M	0x00104208
+#define MAC34_DEF_DELAY_10M		0x00104208
+
+/*
+ * 3-bit encode of CPU freqeucy
+ * Some code is duplicated
+ */
+enum ast2600_cpu_freq {
+	CPU_FREQ_1200M_1,
+	CPU_FREQ_1600M_1,
+	CPU_FREQ_1200M_2,
+	CPU_FREQ_1600M_2,
+	CPU_FREQ_800M_1,
+	CPU_FREQ_800M_2,
+	CPU_FREQ_800M_3,
+	CPU_FREQ_800M_4,
+};
+
+struct ast2600_clk_priv {
+	struct ast2600_scu *scu;
+};
+
+/*
+ * Clock divider/multiplier configuration struct.
+ * For H-PLL and M-PLL the formula is
+ * (Output Frequency) = CLKIN * ((M + 1) / (N + 1)) / (P + 1)
+ * M - Numerator
+ * N - Denumerator
+ * P - Post Divider
+ * They have the same layout in their control register.
+ *
+ * D-PLL and D2-PLL have extra divider (OD + 1), which is not
+ * yet needed and ignored by clock configurations.
+ */
+union ast2600_pll_reg {
+	uint32_t w;
+	struct {
+		unsigned int m : 13;
+		unsigned int n : 6;
+		unsigned int p : 4;
+		unsigned int off : 1;
+		unsigned int bypass : 1;
+		unsigned int reset : 1;
+		unsigned int reserved : 6;
+	} b;
+};
+
+struct ast2600_pll_cfg {
+	union ast2600_pll_reg reg;
+	unsigned int ext_reg;
+};
+
+struct ast2600_pll_desc {
+	uint32_t in;
+	uint32_t out;
+	struct ast2600_pll_cfg cfg;
+};
+
+static const struct ast2600_pll_desc ast2600_pll_lookup[] = {
+	{
+		.in = CLKIN_25M,
+		.out = 400000000,
+		.cfg.reg.b.m = 95,
+		.cfg.reg.b.n = 2,
+		.cfg.reg.b.p = 1,
+		.cfg.ext_reg = 0x31,
+	},
+	{
+		.in = CLKIN_25M,
+		.out = 200000000,
+		.cfg.reg.b.m = 127,
+		.cfg.reg.b.n = 0,
+		.cfg.reg.b.p = 15,
+		.cfg.ext_reg = 0x3f,
+	},
+	{
+		.in = CLKIN_25M,
+		.out = 334000000,
+		.cfg.reg.b.m = 667,
+		.cfg.reg.b.n = 4,
+		.cfg.reg.b.p = 9,
+		.cfg.ext_reg = 0x14d,
+	},
+	{
+		.in = CLKIN_25M,
+		.out = 1000000000,
+		.cfg.reg.b.m = 119,
+		.cfg.reg.b.n = 2,
+		.cfg.reg.b.p = 0,
+		.cfg.ext_reg = 0x3d,
+	},
+	{
+		.in = CLKIN_25M,
+		.out = 50000000,
+		.cfg.reg.b.m = 95,
+		.cfg.reg.b.n = 2,
+		.cfg.reg.b.p = 15,
+		.cfg.ext_reg = 0x31,
+	},
+};
+
+/* divisor tables */
+static uint32_t axi_ahb_div0_table[] = {
+	3, 2, 3, 4,
+};
+
+static uint32_t axi_ahb_div1_table[] = {
+	3, 4, 6, 8,
+};
+
+static uint32_t axi_ahb_default_table[] = {
+	3, 4, 3, 4, 2, 2, 2, 2,
+};
+
+extern uint32_t ast2600_get_pll_rate(struct ast2600_scu *scu, int pll_idx)
+{
+	union ast2600_pll_reg pll_reg;
+	uint32_t hwstrap1;
+	uint32_t cpu_freq;
+	uint32_t mul = 1, div = 1;
+
+	switch (pll_idx) {
+	case ASPEED_CLK_APLL:
+		pll_reg.w = readl(&scu->apll);
+		break;
+	case ASPEED_CLK_DPLL:
+		pll_reg.w = readl(&scu->dpll);
+		break;
+	case ASPEED_CLK_EPLL:
+		pll_reg.w = readl(&scu->epll);
+		break;
+	case ASPEED_CLK_HPLL:
+		pll_reg.w = readl(&scu->hpll);
+		break;
+	case ASPEED_CLK_MPLL:
+		pll_reg.w = readl(&scu->mpll);
+		break;
+	}
+
+	if (!pll_reg.b.bypass) {
+		/* F = 25Mhz * [(M + 2) / (n + 1)] / (p + 1)
+		 * HPLL Numerator (M) = fix 0x5F when SCU500[10]=1
+		 * Fixed 0xBF when SCU500[10]=0 and SCU500[8]=1
+		 * SCU200[12:0] (default 0x8F) when SCU510[10]=0 and SCU510[8]=0
+		 * HPLL Denumerator (N) =	SCU200[18:13] (default 0x2)
+		 * HPLL Divider (P)	 =	SCU200[22:19] (default 0x0)
+		 * HPLL Bandwidth Adj (NB) =  fix 0x2F when SCU500[10]=1
+		 * Fixed 0x5F when SCU500[10]=0 and SCU500[8]=1
+		 * SCU204[11:0] (default 0x31) when SCU500[10]=0 and SCU500[8]=0
+		 */
+		if (pll_idx == ASPEED_CLK_HPLL) {
+			hwstrap1 = readl(&scu->hwstrap1);
+			cpu_freq = (hwstrap1 & SCU_HWSTRAP1_CPU_FREQ_MASK) >>
+				    SCU_HWSTRAP1_CPU_FREQ_SHIFT;
+
+			switch (cpu_freq) {
+			case CPU_FREQ_800M_1:
+			case CPU_FREQ_800M_2:
+			case CPU_FREQ_800M_3:
+			case CPU_FREQ_800M_4:
+				pll_reg.b.m = 0x5f;
+				break;
+			case CPU_FREQ_1600M_1:
+			case CPU_FREQ_1600M_2:
+				pll_reg.b.m = 0xbf;
+				break;
+			default:
+				pll_reg.b.m = 0x8f;
+				break;
+			}
+		}
+
+		mul = (pll_reg.b.m + 1) / (pll_reg.b.n + 1);
+		div = (pll_reg.b.p + 1);
+	}
+
+	return ((CLKIN_25M * mul) / div);
+}
+
+static uint32_t ast2600_get_hclk_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = ast2600_get_pll_rate(scu, ASPEED_CLK_HPLL);
+	uint32_t axi_div, ahb_div;
+	uint32_t hwstrap1 = readl(&scu->hwstrap1);
+	uint32_t cpu_freq = (hwstrap1 & SCU_HWSTRAP1_CPU_FREQ_MASK) >>
+			     SCU_HWSTRAP1_CPU_FREQ_SHIFT;
+	uint32_t axi_ahb_ratio = (hwstrap1 & SCU_HWSTRAP1_AXI_AHB_CLK_RATIO_MASK) >>
+				  SCU_HWSTRAP1_AXI_AHB_CLK_RATIO_SHIFT;
+
+	if (hwstrap1 & SCU_HWSTRAP1_CPU_AXI_CLK_RATIO) {
+		axi_ahb_div1_table[0] = axi_ahb_default_table[cpu_freq] * 2;
+		axi_div = 1;
+		ahb_div = axi_ahb_div1_table[axi_ahb_ratio];
+	} else {
+		axi_ahb_div0_table[0] = axi_ahb_default_table[cpu_freq];
+		axi_div = 2;
+		ahb_div = axi_ahb_div0_table[axi_ahb_ratio];
+	}
+
+	return (rate / axi_div / ahb_div);
+}
+
+static uint32_t ast2600_get_bclk_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = ast2600_get_pll_rate(scu, ASPEED_CLK_HPLL);
+	uint32_t clksrc1 = readl(&scu->clksrc1);
+	uint32_t bclk_div = (clksrc1 & SCU_CLKSRC1_BCLK_DIV_MASK) >>
+			     SCU_CLKSRC1_BCLK_DIV_SHIFT;
+
+	return (rate / ((bclk_div + 1) * 4));
+}
+
+static uint32_t ast2600_get_pclk1_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = ast2600_get_pll_rate(scu, ASPEED_CLK_HPLL);
+	uint32_t clksrc1 = readl(&scu->clksrc1);
+	uint32_t pclk_div = (clksrc1 & SCU_CLKSRC1_PCLK_DIV_MASK) >>
+			     SCU_CLKSRC1_PCLK_DIV_SHIFT;
+
+	return (rate / ((pclk_div + 1) * 4));
+}
+
+static uint32_t ast2600_get_pclk2_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = ast2600_get_hclk_rate(scu);
+	uint32_t clksrc4 = readl(&scu->clksrc4);
+	uint32_t pclk_div = (clksrc4 & SCU_CLKSRC4_PCLK_DIV_MASK) >>
+			     SCU_CLKSRC4_PCLK_DIV_SHIFT;
+
+	return (rate / ((pclk_div + 1) * 2));
+}
+
+static uint32_t ast2600_get_uxclk_in_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = 0;
+	uint32_t clksrc5 = readl(&scu->clksrc5);
+	uint32_t uxclk = (clksrc5 & SCU_CLKSRC5_UXCLK_MASK) >>
+			  SCU_CLKSRC5_UXCLK_SHIFT;
+
+	switch (uxclk) {
+	case 0:
+		rate = ast2600_get_pll_rate(scu, ASPEED_CLK_APLL) / 4;
+		break;
+	case 1:
+		rate = ast2600_get_pll_rate(scu, ASPEED_CLK_APLL) / 2;
+		break;
+	case 2:
+		rate = ast2600_get_pll_rate(scu, ASPEED_CLK_APLL);
+		break;
+	case 3:
+		rate = ast2600_get_hclk_rate(scu);
+		break;
+	}
+
+	return rate;
+}
+
+static uint32_t ast2600_get_huxclk_in_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = 0;
+	uint32_t clksrc5 = readl(&scu->clksrc5);
+	uint32_t huxclk = (clksrc5 & SCU_CLKSRC5_HUXCLK_MASK) >>
+			   SCU_CLKSRC5_HUXCLK_SHIFT;
+
+	switch (huxclk) {
+	case 0:
+		rate = ast2600_get_pll_rate(scu, ASPEED_CLK_APLL) / 4;
+		break;
+	case 1:
+		rate = ast2600_get_pll_rate(scu, ASPEED_CLK_APLL) / 2;
+		break;
+	case 2:
+		rate = ast2600_get_pll_rate(scu, ASPEED_CLK_APLL);
+		break;
+	case 3:
+		rate = ast2600_get_hclk_rate(scu);
+		break;
+	}
+
+	return rate;
+}
+
+static uint32_t ast2600_get_uart_uxclk_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = ast2600_get_uxclk_in_rate(scu);
+	uint32_t uart_clkgen = readl(&scu->uart_clkgen);
+	uint32_t n = (uart_clkgen & SCU_UART_CLKGEN_N_MASK) >>
+		      SCU_UART_CLKGEN_N_SHIFT;
+	uint32_t r = (uart_clkgen & SCU_UART_CLKGEN_R_MASK) >>
+		      SCU_UART_CLKGEN_R_SHIFT;
+
+	return ((rate * r) / (n * 2));
+}
+
+static uint32_t ast2600_get_uart_huxclk_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = ast2600_get_huxclk_in_rate(scu);
+	uint32_t huart_clkgen = readl(&scu->huart_clkgen);
+	uint32_t n = (huart_clkgen & SCU_HUART_CLKGEN_N_MASK) >>
+		      SCU_HUART_CLKGEN_N_SHIFT;
+	uint32_t r = (huart_clkgen & SCU_HUART_CLKGEN_R_MASK) >>
+		      SCU_HUART_CLKGEN_R_SHIFT;
+
+	return ((rate * r) / (n * 2));
+}
+
+static uint32_t ast2600_get_sdio_clk_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = 0;
+	uint32_t clksrc4 = readl(&scu->clksrc4);
+	uint32_t sdio_div = (clksrc4 & SCU_CLKSRC4_SDIO_DIV_MASK) >>
+			     SCU_CLKSRC4_SDIO_DIV_SHIFT;
+
+	if (clksrc4 & SCU_CLKSRC4_SDIO)
+		rate = ast2600_get_pll_rate(scu, ASPEED_CLK_APLL);
+	else
+		rate = ast2600_get_hclk_rate(scu);
+
+	return (rate / ((sdio_div + 1) * 2));
+}
+
+static uint32_t ast2600_get_emmc_clk_rate(struct ast2600_scu *scu)
+{
+	uint32_t rate = ast2600_get_pll_rate(scu, ASPEED_CLK_HPLL);
+	uint32_t clksrc1 = readl(&scu->clksrc1);
+	uint32_t emmc_div = (clksrc1 & SCU_CLKSRC1_EMMC_DIV_MASK) >>
+			     SCU_CLKSRC1_EMMC_DIV_SHIFT;
+
+	return (rate / ((emmc_div + 1) * 4));
+}
+
+static uint32_t ast2600_get_uart_clk_rate(struct ast2600_scu *scu, int uart_idx)
+{
+	uint32_t rate = 0;
+	uint32_t uart5_clk = 0;
+	uint32_t clksrc2 = readl(&scu->clksrc2);
+	uint32_t clksrc4 = readl(&scu->clksrc4);
+	uint32_t clksrc5 = readl(&scu->clksrc5);
+	uint32_t misc_ctrl1 = readl(&scu->misc_ctrl1);
+
+	switch (uart_idx) {
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+	case 6:
+		if (clksrc4 & BIT(uart_idx - 1))
+			rate = ast2600_get_uart_huxclk_rate(scu);
+		else
+			rate = ast2600_get_uart_uxclk_rate(scu);
+		break;
+	case 5:
+		/*
+		 * SCU0C[12] and SCU304[14] together decide
+		 * the UART5 clock generation
+		 */
+		if (misc_ctrl1 & SCU_MISC_CTRL1_UART5_DIV)
+			uart5_clk = 0x1 << 1;
+
+		if (clksrc2 & SCU_CLKSRC2_UART5)
+			uart5_clk |= 0x1;
+
+		switch (uart5_clk) {
+		case 0:
+			rate = 24000000;
+			break;
+		case 1:
+			rate = 192000000;
+			break;
+		case 2:
+			rate = 24000000 / 13;
+			break;
+		case 3:
+			rate = 192000000 / 13;
+			break;
+		}
+
+		break;
+	case 7:
+	case 8:
+	case 9:
+	case 10:
+	case 11:
+	case 12:
+	case 13:
+		if (clksrc5 & BIT(uart_idx - 1))
+			rate = ast2600_get_uart_huxclk_rate(scu);
+		else
+			rate = ast2600_get_uart_uxclk_rate(scu);
+		break;
+	}
+
+	return rate;
+}
+
+static ulong ast2600_clk_get_rate(struct clk *clk)
+{
+	struct ast2600_clk_priv *priv = dev_get_priv(clk->dev);
+	ulong rate = 0;
+
+	switch (clk->id) {
+	case ASPEED_CLK_HPLL:
+	case ASPEED_CLK_EPLL:
+	case ASPEED_CLK_DPLL:
+	case ASPEED_CLK_MPLL:
+	case ASPEED_CLK_APLL:
+		rate = ast2600_get_pll_rate(priv->scu, clk->id);
+		break;
+	case ASPEED_CLK_AHB:
+		rate = ast2600_get_hclk_rate(priv->scu);
+		break;
+	case ASPEED_CLK_APB1:
+		rate = ast2600_get_pclk1_rate(priv->scu);
+		break;
+	case ASPEED_CLK_APB2:
+		rate = ast2600_get_pclk2_rate(priv->scu);
+		break;
+	case ASPEED_CLK_GATE_UART1CLK:
+		rate = ast2600_get_uart_clk_rate(priv->scu, 1);
+		break;
+	case ASPEED_CLK_GATE_UART2CLK:
+		rate = ast2600_get_uart_clk_rate(priv->scu, 2);
+		break;
+	case ASPEED_CLK_GATE_UART3CLK:
+		rate = ast2600_get_uart_clk_rate(priv->scu, 3);
+		break;
+	case ASPEED_CLK_GATE_UART4CLK:
+		rate = ast2600_get_uart_clk_rate(priv->scu, 4);
+		break;
+	case ASPEED_CLK_GATE_UART5CLK:
+		rate = ast2600_get_uart_clk_rate(priv->scu, 5);
+		break;
+	case ASPEED_CLK_BCLK:
+		rate = ast2600_get_bclk_rate(priv->scu);
+		break;
+	case ASPEED_CLK_SDIO:
+		rate = ast2600_get_sdio_clk_rate(priv->scu);
+		break;
+	case ASPEED_CLK_EMMC:
+		rate = ast2600_get_emmc_clk_rate(priv->scu);
+		break;
+	case ASPEED_CLK_UARTX:
+		rate = ast2600_get_uart_uxclk_rate(priv->scu);
+		break;
+	case ASPEED_CLK_HUARTX:
+		rate = ast2600_get_uart_huxclk_rate(priv->scu);
+		break;
+	default:
+		debug("can't get clk rate\n");
+		return -ENOENT;
+	}
+
+	return rate;
+}
+
+/**
+ * @brief	lookup PLL divider config by input/output rate
+ * @param[in]	*pll - PLL descriptor
+ * @return	true - if PLL divider config is found, false - else
+ * The function caller shall fill "pll->in" and "pll->out",
+ * then this function will search the lookup table
+ * to find a valid PLL divider configuration.
+ */
+static bool ast2600_search_clock_config(struct ast2600_pll_desc *pll)
+{
+	uint32_t i;
+	const struct ast2600_pll_desc *def_desc;
+	bool is_found = false;
+
+	for (i = 0; i < ARRAY_SIZE(ast2600_pll_lookup); i++) {
+		def_desc = &ast2600_pll_lookup[i];
+
+		if (def_desc->in == pll->in && def_desc->out == pll->out) {
+			is_found = true;
+			pll->cfg.reg.w = def_desc->cfg.reg.w;
+			pll->cfg.ext_reg = def_desc->cfg.ext_reg;
+			break;
+		}
+	}
+	return is_found;
+}
+
+static uint32_t ast2600_configure_pll(struct ast2600_scu *scu,
+				 struct ast2600_pll_cfg *p_cfg, int pll_idx)
+{
+	uint32_t addr, addr_ext;
+	uint32_t reg;
+
+	switch (pll_idx) {
+	case ASPEED_CLK_HPLL:
+		addr = (uint32_t)(&scu->hpll);
+		addr_ext = (uint32_t)(&scu->hpll_ext);
+		break;
+	case ASPEED_CLK_MPLL:
+		addr = (uint32_t)(&scu->mpll);
+		addr_ext = (uint32_t)(&scu->mpll_ext);
+		break;
+	case ASPEED_CLK_DPLL:
+		addr = (uint32_t)(&scu->dpll);
+		addr_ext = (uint32_t)(&scu->dpll_ext);
+		break;
+	case ASPEED_CLK_EPLL:
+		addr = (uint32_t)(&scu->epll);
+		addr_ext = (uint32_t)(&scu->epll_ext);
+		break;
+	case ASPEED_CLK_APLL:
+		addr = (uint32_t)(&scu->apll);
+		addr_ext = (uint32_t)(&scu->apll_ext);
+		break;
+	default:
+		debug("unknown PLL index\n");
+		return 1;
+	}
+
+	p_cfg->reg.b.bypass = 0;
+	p_cfg->reg.b.off = 1;
+	p_cfg->reg.b.reset = 1;
+
+	reg = readl(addr);
+	reg &= ~GENMASK(25, 0);
+	reg |= p_cfg->reg.w;
+	writel(reg, addr);
+
+	/* write extend parameter */
+	writel(p_cfg->ext_reg, addr_ext);
+	udelay(100);
+	p_cfg->reg.b.off = 0;
+	p_cfg->reg.b.reset = 0;
+	reg &= ~GENMASK(25, 0);
+	reg |= p_cfg->reg.w;
+	writel(reg, addr);
+	while (!(readl(addr_ext) & BIT(31)))
+		;
+
+	return 0;
+}
+
+static uint32_t ast2600_configure_ddr(struct ast2600_scu *scu, ulong rate)
+{
+	struct ast2600_pll_desc mpll;
+
+	mpll.in = CLKIN_25M;
+	mpll.out = rate;
+	if (ast2600_search_clock_config(&mpll) == false) {
+		printf("error!! unable to find valid DDR clock setting\n");
+		return 0;
+	}
+	ast2600_configure_pll(scu, &mpll.cfg, ASPEED_CLK_MPLL);
+
+	return ast2600_get_pll_rate(scu, ASPEED_CLK_MPLL);
+}
+
+static ulong ast2600_clk_set_rate(struct clk *clk, ulong rate)
+{
+	struct ast2600_clk_priv *priv = dev_get_priv(clk->dev);
+	ulong new_rate;
+
+	switch (clk->id) {
+	case ASPEED_CLK_MPLL:
+		new_rate = ast2600_configure_ddr(priv->scu, rate);
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	return new_rate;
+}
+
+static uint32_t ast2600_configure_mac12_clk(struct ast2600_scu *scu)
+{
+	/* scu340[25:0]: 1G default delay */
+	clrsetbits_le32(&scu->mac12_clk_delay, GENMASK(25, 0),
+			MAC12_DEF_DELAY_1G);
+
+	/* set 100M/10M default delay */
+	writel(MAC12_DEF_DELAY_100M, &scu->mac12_clk_delay_100M);
+	writel(MAC12_DEF_DELAY_10M, &scu->mac12_clk_delay_10M);
+
+	/* MAC AHB = HPLL / 6 */
+	clrsetbits_le32(&scu->clksrc1, SCU_CLKSRC1_MAC_DIV_MASK,
+			(0x2 << SCU_CLKSRC1_MAC_DIV_SHIFT));
+
+	return 0;
+}
+
+static uint32_t ast2600_configure_mac34_clk(struct ast2600_scu *scu)
+{
+	/*
+	 * scu350[31]   RGMII 125M source: 0 = from IO pin
+	 * scu350[25:0] MAC 1G delay
+	 */
+	clrsetbits_le32(&scu->mac34_clk_delay, (BIT(31) | GENMASK(25, 0)),
+			MAC34_DEF_DELAY_1G);
+	writel(MAC34_DEF_DELAY_100M, &scu->mac34_clk_delay_100M);
+	writel(MAC34_DEF_DELAY_10M, &scu->mac34_clk_delay_10M);
+
+	/*
+	 * clock source seletion and divider
+	 * scu310[26:24] : MAC AHB bus clock = HCLK / 2
+	 * scu310[18:16] : RMII 50M = HCLK_200M / 4
+	 */
+	clrsetbits_le32(&scu->clksrc4,
+			(SCU_CLKSRC4_MAC_DIV_MASK | SCU_CLKSRC4_RMII34_DIV_MASK),
+			((0x0 << SCU_CLKSRC4_MAC_DIV_SHIFT)
+			 | (0x3 << SCU_CLKSRC4_RMII34_DIV_SHIFT)));
+
+	/*
+	 * set driving strength
+	 * scu458[3:2] : MAC4 driving strength
+	 * scu458[1:0] : MAC3 driving strength
+	 */
+	clrsetbits_le32(&scu->pinmux16,
+			SCU_PINCTRL16_MAC4_DRIVING_MASK | SCU_PINCTRL16_MAC3_DRIVING_MASK,
+			(0x3 << SCU_PINCTRL16_MAC4_DRIVING_SHIFT)
+			 | (0x3 << SCU_PINCTRL16_MAC3_DRIVING_SHIFT));
+
+	return 0;
+}
+
+/**
+ * ast2600 RGMII clock source tree
+ * 125M from external PAD -------->|\
+ * HPLL -->|\                      | |---->RGMII 125M for MAC#1 & MAC#2
+ *         | |---->| divider |---->|/                             +
+ * EPLL -->|/                                                     |
+ *                                                                |
+ * +---------<-----------|RGMIICK PAD output enable|<-------------+
+ * |
+ * +--------------------------->|\
+ *                              | |----> RGMII 125M for MAC#3 & MAC#4
+ * HCLK 200M ---->|divider|---->|/
+ * To simplify the control flow:
+ * 1. RGMII 1/2 always use EPLL as the internal clock source
+ * 2. RGMII 3/4 always use RGMIICK pad as the RGMII 125M source
+ * 125M from external PAD -------->|\
+ *                                 | |---->RGMII 125M for MAC#1 & MAC#2
+ *         EPLL---->| divider |--->|/                             +
+ *                                                                |
+ * +<--------------------|RGMIICK PAD output enable|<-------------+
+ * |
+ * +--------------------------->RGMII 125M for MAC#3 & MAC#4
+ */
+#define RGMIICK_SRC_PAD		0
+#define RGMIICK_SRC_EPLL	1 /* recommended */
+#define RGMIICK_SRC_HPLL	2
+
+#define RGMIICK_DIV2	1
+#define RGMIICK_DIV3	2
+#define RGMIICK_DIV4	3
+#define RGMIICK_DIV5	4
+#define RGMIICK_DIV6	5
+#define RGMIICK_DIV7	6
+#define RGMIICK_DIV8	7 /* recommended */
+
+#define RMIICK_DIV4		0
+#define RMIICK_DIV8		1
+#define RMIICK_DIV12	2
+#define RMIICK_DIV16	3
+#define RMIICK_DIV20	4 /* recommended */
+#define RMIICK_DIV24	5
+#define RMIICK_DIV28	6
+#define RMIICK_DIV32	7
+
+struct ast2600_mac_clk_div {
+	uint32_t src; /* 0=external PAD, 1=internal PLL */
+	uint32_t fin; /* divider input speed */
+	uint32_t n; /* 0=div2, 1=div2, 2=div3, 3=div4,...,7=div8 */
+	uint32_t fout; /* fout = fin / n */
+};
+
+struct ast2600_mac_clk_div rgmii_clk_defconfig = {
+	.src = ASPEED_CLK_EPLL,
+	.fin = 1000000000,
+	.n = RGMIICK_DIV8,
+	.fout = 125000000,
+};
+
+struct ast2600_mac_clk_div rmii_clk_defconfig = {
+	.src = ASPEED_CLK_EPLL,
+	.fin = 1000000000,
+	.n = RMIICK_DIV20,
+	.fout = 50000000,
+};
+
+static void ast2600_init_mac_pll(struct ast2600_scu *p_scu,
+				 struct ast2600_mac_clk_div *p_cfg)
+{
+	struct ast2600_pll_desc pll;
+
+	pll.in = CLKIN_25M;
+	pll.out = p_cfg->fin;
+	if (ast2600_search_clock_config(&pll) == false) {
+		pr_err("unable to find valid ETHNET MAC clock setting\n");
+		return;
+	}
+	ast2600_configure_pll(p_scu, &pll.cfg, p_cfg->src);
+}
+
+static void ast2600_init_rgmii_clk(struct ast2600_scu *p_scu,
+				   struct ast2600_mac_clk_div *p_cfg)
+{
+	uint32_t reg_304 = readl(&p_scu->clksrc2);
+	uint32_t reg_340 = readl(&p_scu->mac12_clk_delay);
+	uint32_t reg_350 = readl(&p_scu->mac34_clk_delay);
+
+	reg_340 &= ~GENMASK(31, 29);
+	/* scu340[28]: RGMIICK PAD output enable (to MAC 3/4) */
+	reg_340 |= BIT(28);
+	if (p_cfg->src == ASPEED_CLK_EPLL || p_cfg->src == ASPEED_CLK_HPLL) {
+		/*
+		 * re-init PLL if the current PLL output frequency doesn't match
+		 * the divider setting
+		 */
+		if (p_cfg->fin != ast2600_get_pll_rate(p_scu, p_cfg->src))
+			ast2600_init_mac_pll(p_scu, p_cfg);
+		/* scu340[31]: select RGMII 125M from internal source */
+		reg_340 |= BIT(31);
+	}
+
+	reg_304 &= ~GENMASK(23, 20);
+
+	/* set clock divider */
+	reg_304 |= (p_cfg->n & 0x7) << 20;
+
+	/* select internal clock source */
+	if (p_cfg->src == ASPEED_CLK_HPLL)
+		reg_304 |= BIT(23);
+
+	/* RGMII 3/4 clock source select */
+	reg_350 &= ~BIT(31);
+
+	writel(reg_304, &p_scu->clksrc2);
+	writel(reg_340, &p_scu->mac12_clk_delay);
+	writel(reg_350, &p_scu->mac34_clk_delay);
+}
+
+/**
+ * ast2600 RMII/NCSI clock source tree
+ * HPLL -->|\
+ *         | |---->| divider |----> RMII 50M for MAC#1 & MAC#2
+ * EPLL -->|/
+ * HCLK(SCLICLK)---->| divider |----> RMII 50M for MAC#3 & MAC#4
+ */
+static void ast2600_init_rmii_clk(struct ast2600_scu *p_scu,
+				  struct ast2600_mac_clk_div *p_cfg)
+{
+	uint32_t clksrc2 = readl(&p_scu->clksrc2);
+	uint32_t clksrc4 = readl(&p_scu->clksrc4);
+
+	if (p_cfg->src == ASPEED_CLK_EPLL || p_cfg->src == ASPEED_CLK_HPLL) {
+		/*
+		 * re-init PLL if the current PLL output frequency doesn't match
+		 * the divider setting
+		 */
+		if (p_cfg->fin != ast2600_get_pll_rate(p_scu, p_cfg->src))
+			ast2600_init_mac_pll(p_scu, p_cfg);
+	}
+
+	clksrc2 &= ~(SCU_CLKSRC2_RMII12 | SCU_CLKSRC2_RMII12_DIV_MASK);
+
+	/* set RMII 1/2 clock divider */
+	clksrc2 |= (p_cfg->n & 0x7) << 16;
+
+	/* RMII clock source selection */
+	if (p_cfg->src == ASPEED_CLK_HPLL)
+		clksrc2 |= SCU_CLKSRC2_RMII12;
+
+	/* set RMII 3/4 clock divider */
+	clksrc4 &= ~SCU_CLKSRC4_RMII34_DIV_MASK;
+	clksrc4 |= (0x3 << SCU_CLKSRC4_RMII34_DIV_SHIFT);
+
+	writel(clksrc2, &p_scu->clksrc2);
+	writel(clksrc4, &p_scu->clksrc4);
+}
+
+static uint32_t ast2600_configure_mac(struct ast2600_scu *scu, int index)
+{
+	uint32_t reset_bit;
+	uint32_t clkgate_bit;
+
+	switch (index) {
+	case 1:
+		reset_bit = BIT(ASPEED_RESET_MAC1);
+		clkgate_bit = SCU_CLKGATE1_MAC1;
+		writel(reset_bit, &scu->modrst_ctrl1);
+		udelay(100);
+		writel(clkgate_bit, &scu->clkgate_clr1);
+		mdelay(10);
+		writel(reset_bit, &scu->modrst_clr1);
+		break;
+	case 2:
+		reset_bit = BIT(ASPEED_RESET_MAC2);
+		clkgate_bit = SCU_CLKGATE1_MAC2;
+		writel(reset_bit, &scu->modrst_ctrl1);
+		udelay(100);
+		writel(clkgate_bit, &scu->clkgate_clr1);
+		mdelay(10);
+		writel(reset_bit, &scu->modrst_clr1);
+		break;
+	case 3:
+		reset_bit = BIT(ASPEED_RESET_MAC3 - 32);
+		clkgate_bit = SCU_CLKGATE2_MAC3;
+		writel(reset_bit, &scu->modrst_ctrl2);
+		udelay(100);
+		writel(clkgate_bit, &scu->clkgate_clr2);
+		mdelay(10);
+		writel(reset_bit, &scu->modrst_clr2);
+		break;
+	case 4:
+		reset_bit = BIT(ASPEED_RESET_MAC4 - 32);
+		clkgate_bit = SCU_CLKGATE2_MAC4;
+		writel(reset_bit, &scu->modrst_ctrl2);
+		udelay(100);
+		writel(clkgate_bit, &scu->clkgate_clr2);
+		mdelay(10);
+		writel(reset_bit, &scu->modrst_clr2);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void ast2600_configure_rsa_ecc_clk(struct ast2600_scu *scu)
+{
+	uint32_t clksrc1 = readl(&scu->clksrc1);
+
+	/* Configure RSA clock = HPLL/3 */
+	clksrc1 |= SCU_CLKSRC1_ECC_RSA;
+	clksrc1 &= ~SCU_CLKSRC1_ECC_RSA_DIV_MASK;
+	clksrc1 |= (2 << SCU_CLKSRC1_ECC_RSA_DIV_SHIFT);
+
+	writel(clksrc1, &scu->clksrc1);
+}
+
+static ulong ast2600_enable_sdclk(struct ast2600_scu *scu)
+{
+	uint32_t reset_bit;
+	uint32_t clkgate_bit;
+
+	reset_bit = BIT(ASPEED_RESET_SD - 32);
+	clkgate_bit = SCU_CLKGATE2_SDIO;
+
+	writel(reset_bit, &scu->modrst_ctrl2);
+	udelay(100);
+	writel(clkgate_bit, &scu->clkgate_clr2);
+	mdelay(10);
+	writel(reset_bit, &scu->modrst_clr2);
+
+	return 0;
+}
+
+static ulong ast2600_enable_extsdclk(struct ast2600_scu *scu)
+{
+	int i = 0;
+	uint32_t div = 0;
+	uint32_t rate = 0;
+	uint32_t clksrc4 = readl(&scu->clksrc4);
+
+	/*
+	 * ast2600 SD controller max clk is 200Mhz
+	 * use apll for clock source 800/4 = 200
+	 * controller max is 200mhz
+	 */
+	rate = ast2600_get_pll_rate(scu, ASPEED_CLK_APLL);
+	for (i = 0; i < 8; i++) {
+		div = (i + 1) * 2;
+		if ((rate / div) <= 200000000)
+			break;
+	}
+	clksrc4 &= ~SCU_CLKSRC4_SDIO_DIV_MASK;
+	clksrc4 |= (i << SCU_CLKSRC4_SDIO_DIV_SHIFT);
+	clksrc4 |= SCU_CLKSRC4_SDIO;
+	writel(clksrc4, &scu->clksrc4);
+
+	setbits_le32(&scu->clksrc4, SCU_CLKSRC4_SDIO_EN);
+
+	return 0;
+}
+
+static ulong ast2600_enable_emmcclk(struct ast2600_scu *scu)
+{
+	uint32_t reset_bit;
+	uint32_t clkgate_bit;
+
+	reset_bit = BIT(ASPEED_RESET_EMMC);
+	clkgate_bit = SCU_CLKGATE1_EMMC;
+
+	writel(reset_bit, &scu->modrst_ctrl1);
+	udelay(100);
+	writel(clkgate_bit, &scu->clkgate_clr1);
+	mdelay(10);
+	writel(reset_bit, &scu->modrst_clr1);
+
+	return 0;
+}
+
+static ulong ast2600_enable_extemmcclk(struct ast2600_scu *scu)
+{
+	int i = 0;
+	uint32_t div = 0;
+	uint32_t rate = 0;
+	uint32_t clksrc1 = readl(&scu->clksrc1);
+
+	/*
+	 * ast2600 eMMC controller max clk is 200Mhz
+	 * HPll->1/2->|\
+	 *				|->SCU300[11]->SCU300[14:12][1/N] +
+	 * MPLL------>|/								  |
+	 * +----------------------------------------------+
+	 * |
+	 * +---------> EMMC12C[15:8][1/N]-> eMMC clk
+	 */
+	rate = ast2600_get_pll_rate(scu, ASPEED_CLK_MPLL);
+	for (i = 0; i < 8; i++) {
+		div = (i + 1) * 2;
+		if ((rate / div) <= 200000000)
+			break;
+	}
+
+	clksrc1 &= ~SCU_CLKSRC1_EMMC_DIV_MASK;
+	clksrc1 |= (i << SCU_CLKSRC1_EMMC_DIV_SHIFT);
+	clksrc1 |= SCU_CLKSRC1_EMMC;
+	writel(clksrc1, &scu->clksrc1);
+
+	setbits_le32(&scu->clksrc1, SCU_CLKSRC1_EMMC_EN);
+
+	return 0;
+}
+
+static ulong ast2600_enable_fsiclk(struct ast2600_scu *scu)
+{
+	uint32_t reset_bit;
+	uint32_t clkgate_bit;
+
+	reset_bit = BIT(ASPEED_RESET_FSI % 32);
+	clkgate_bit = SCU_CLKGATE2_FSI;
+
+	/* The FSI clock is shared between masters. If it's already on
+	 * don't touch it, as that will reset the existing master.
+	 */
+	if (!(readl(&scu->clkgate_ctrl2) & clkgate_bit)) {
+		debug("%s: already running, not touching it\n", __func__);
+		return 0;
+	}
+
+	writel(reset_bit, &scu->modrst_ctrl2);
+	udelay(100);
+	writel(clkgate_bit, &scu->clkgate_clr2);
+	mdelay(10);
+	writel(reset_bit, &scu->modrst_clr2);
+
+	return 0;
+}
+
+static ulong ast2600_enable_usbahclk(struct ast2600_scu *scu)
+{
+	uint32_t reset_bit;
+	uint32_t clkgate_bit;
+
+	reset_bit = BIT(ASPEED_RESET_EHCI_P1);
+	clkgate_bit = SCU_CLKGATE1_USB_HUB;
+
+	writel(reset_bit, &scu->modrst_ctrl1);
+	udelay(100);
+	writel(clkgate_bit, &scu->clkgate_ctrl1);
+	mdelay(20);
+	writel(reset_bit, &scu->modrst_clr1);
+
+	return 0;
+}
+
+static ulong ast2600_enable_usbbhclk(struct ast2600_scu *scu)
+{
+	uint32_t reset_bit;
+	uint32_t clkgate_bit;
+
+	reset_bit = BIT(ASPEED_RESET_EHCI_P2);
+	clkgate_bit = SCU_CLKGATE1_USB_HOST2;
+
+	writel(reset_bit, &scu->modrst_ctrl1);
+	udelay(100);
+	writel(clkgate_bit, &scu->clkgate_clr1);
+	mdelay(20);
+	writel(reset_bit, &scu->modrst_clr1);
+
+	return 0;
+}
+
+static int ast2600_clk_enable(struct clk *clk)
+{
+	struct ast2600_clk_priv *priv = dev_get_priv(clk->dev);
+
+	switch (clk->id) {
+	case ASPEED_CLK_GATE_MAC1CLK:
+		ast2600_configure_mac(priv->scu, 1);
+		break;
+	case ASPEED_CLK_GATE_MAC2CLK:
+		ast2600_configure_mac(priv->scu, 2);
+		break;
+	case ASPEED_CLK_GATE_MAC3CLK:
+		ast2600_configure_mac(priv->scu, 3);
+		break;
+	case ASPEED_CLK_GATE_MAC4CLK:
+		ast2600_configure_mac(priv->scu, 4);
+		break;
+	case ASPEED_CLK_GATE_SDCLK:
+		ast2600_enable_sdclk(priv->scu);
+		break;
+	case ASPEED_CLK_GATE_SDEXTCLK:
+		ast2600_enable_extsdclk(priv->scu);
+		break;
+	case ASPEED_CLK_GATE_EMMCCLK:
+		ast2600_enable_emmcclk(priv->scu);
+		break;
+	case ASPEED_CLK_GATE_EMMCEXTCLK:
+		ast2600_enable_extemmcclk(priv->scu);
+		break;
+	case ASPEED_CLK_GATE_FSICLK:
+		ast2600_enable_fsiclk(priv->scu);
+		break;
+	case ASPEED_CLK_GATE_USBPORT1CLK:
+		ast2600_enable_usbahclk(priv->scu);
+		break;
+	case ASPEED_CLK_GATE_USBPORT2CLK:
+		ast2600_enable_usbbhclk(priv->scu);
+		break;
+	default:
+		pr_err("can't enable clk\n");
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+struct clk_ops ast2600_clk_ops = {
+	.get_rate = ast2600_clk_get_rate,
+	.set_rate = ast2600_clk_set_rate,
+	.enable = ast2600_clk_enable,
+};
+
+static int ast2600_clk_probe(struct udevice *dev)
+{
+	struct ast2600_clk_priv *priv = dev_get_priv(dev);
+
+	priv->scu = devfdt_get_addr_ptr(dev);
+	if (IS_ERR(priv->scu))
+		return PTR_ERR(priv->scu);
+
+	ast2600_init_rgmii_clk(priv->scu, &rgmii_clk_defconfig);
+	ast2600_init_rmii_clk(priv->scu, &rmii_clk_defconfig);
+	ast2600_configure_mac12_clk(priv->scu);
+	ast2600_configure_mac34_clk(priv->scu);
+	ast2600_configure_rsa_ecc_clk(priv->scu);
+
+	return 0;
+}
+
+static int ast2600_clk_bind(struct udevice *dev)
+{
+	int ret;
+
+	/* The reset driver does not have a device node, so bind it here */
+	ret = device_bind_driver(gd->dm_root, "ast_sysreset", "reset", &dev);
+	if (ret)
+		debug("Warning: No reset driver: ret=%d\n", ret);
+
+	return 0;
+}
+
+struct aspeed_clks {
+	ulong id;
+	const char *name;
+};
+
+static struct aspeed_clks aspeed_clk_names[] = {
+	{ ASPEED_CLK_HPLL, "hpll" },
+	{ ASPEED_CLK_MPLL, "mpll" },
+	{ ASPEED_CLK_APLL, "apll" },
+	{ ASPEED_CLK_EPLL, "epll" },
+	{ ASPEED_CLK_DPLL, "dpll" },
+	{ ASPEED_CLK_AHB, "hclk" },
+	{ ASPEED_CLK_APB1, "pclk1" },
+	{ ASPEED_CLK_APB2, "pclk2" },
+	{ ASPEED_CLK_BCLK, "bclk" },
+	{ ASPEED_CLK_UARTX, "uxclk" },
+	{ ASPEED_CLK_HUARTX, "huxclk" },
+};
+
+int soc_clk_dump(void)
+{
+	struct udevice *dev;
+	struct clk clk;
+	unsigned long rate;
+	int i, ret;
+
+	ret = uclass_get_device_by_driver(UCLASS_CLK, DM_DRIVER_GET(aspeed_scu),
+					  &dev);
+	if (ret)
+		return ret;
+
+	printf("Clk\t\tHz\n");
+
+	for (i = 0; i < ARRAY_SIZE(aspeed_clk_names); i++) {
+		clk.id = aspeed_clk_names[i].id;
+		ret = clk_request(dev, &clk);
+		if (ret < 0) {
+			debug("%s clk_request() failed: %d\n", __func__, ret);
+			continue;
+		}
+
+		ret = clk_get_rate(&clk);
+		rate = ret;
+
+		clk_free(&clk);
+
+		if (ret == -ENOTSUPP) {
+			printf("clk ID %lu not supported yet\n",
+			       aspeed_clk_names[i].id);
+			continue;
+		}
+		if (ret < 0) {
+			printf("%s %lu: get_rate err: %d\n", __func__,
+			       aspeed_clk_names[i].id, ret);
+			continue;
+		}
+
+		printf("%s(%3lu):\t%lu\n", aspeed_clk_names[i].name,
+		       aspeed_clk_names[i].id, rate);
+	}
+
+	return 0;
+}
+
+static const struct udevice_id ast2600_clk_ids[] = {
+	{ .compatible = "aspeed,ast2600-scu", },
+	{ },
+};
+
+U_BOOT_DRIVER(aspeed_ast2600_scu) = {
+	.name = "aspeed_ast2600_scu",
+	.id = UCLASS_CLK,
+	.of_match = ast2600_clk_ids,
+	.priv_auto = sizeof(struct ast2600_clk_priv),
+	.ops = &ast2600_clk_ops,
+	.bind = ast2600_clk_bind,
+	.probe = ast2600_clk_probe,
+};