clk: Add Ingenic jz4770 CGU driver

Add support for the clocks provided by the CGU in the Ingenic JZ4770
SoC.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18482/
Signed-off-by: James Hogan <jhogan@kernel.org>

1 files changed, 483 insertions, 0 deletions

diff --git a/drivers/clk/ingenic/jz4770-cgu.c b/drivers/clk/ingenic/jz4770-cgu.c
new file mode 100644
index 000000000000..c78d369b9403
--- /dev/null
+++ b/drivers/clk/ingenic/jz4770-cgu.c
@@ -0,0 +1,483 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JZ4770 SoC CGU driver
+ * Copyright 2018, Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/syscore_ops.h>
+#include <dt-bindings/clock/jz4770-cgu.h>
+#include "cgu.h"
+
+/*
+ * CPM registers offset address definition
+ */
+#define CGU_REG_CPCCR		0x00
+#define CGU_REG_LCR		0x04
+#define CGU_REG_CPPCR0		0x10
+#define CGU_REG_CLKGR0		0x20
+#define CGU_REG_OPCR		0x24
+#define CGU_REG_CLKGR1		0x28
+#define CGU_REG_CPPCR1		0x30
+#define CGU_REG_USBPCR1		0x48
+#define CGU_REG_USBCDR		0x50
+#define CGU_REG_I2SCDR		0x60
+#define CGU_REG_LPCDR		0x64
+#define CGU_REG_MSC0CDR		0x68
+#define CGU_REG_UHCCDR		0x6c
+#define CGU_REG_SSICDR		0x74
+#define CGU_REG_CIMCDR		0x7c
+#define CGU_REG_GPSCDR		0x80
+#define CGU_REG_PCMCDR		0x84
+#define CGU_REG_GPUCDR		0x88
+#define CGU_REG_MSC1CDR		0xA4
+#define CGU_REG_MSC2CDR		0xA8
+#define CGU_REG_BCHCDR		0xAC
+
+/* bits within the LCR register */
+#define LCR_LPM			BIT(0)		/* Low Power Mode */
+
+/* bits within the OPCR register */
+#define OPCR_SPENDH		BIT(5)		/* UHC PHY suspend */
+#define OPCR_SPENDN		BIT(7)		/* OTG PHY suspend */
+
+/* bits within the USBPCR1 register */
+#define USBPCR1_UHC_POWER	BIT(5)		/* UHC PHY power down */
+
+static struct ingenic_cgu *cgu;
+
+static int jz4770_uhc_phy_enable(struct clk_hw *hw)
+{
+	void __iomem *reg_opcr		= cgu->base + CGU_REG_OPCR;
+	void __iomem *reg_usbpcr1	= cgu->base + CGU_REG_USBPCR1;
+
+	writel(readl(reg_opcr) & ~OPCR_SPENDH, reg_opcr);
+	writel(readl(reg_usbpcr1) | USBPCR1_UHC_POWER, reg_usbpcr1);
+	return 0;
+}
+
+static void jz4770_uhc_phy_disable(struct clk_hw *hw)
+{
+	void __iomem *reg_opcr		= cgu->base + CGU_REG_OPCR;
+	void __iomem *reg_usbpcr1	= cgu->base + CGU_REG_USBPCR1;
+
+	writel(readl(reg_usbpcr1) & ~USBPCR1_UHC_POWER, reg_usbpcr1);
+	writel(readl(reg_opcr) | OPCR_SPENDH, reg_opcr);
+}
+
+static int jz4770_uhc_phy_is_enabled(struct clk_hw *hw)
+{
+	void __iomem *reg_opcr		= cgu->base + CGU_REG_OPCR;
+	void __iomem *reg_usbpcr1	= cgu->base + CGU_REG_USBPCR1;
+
+	return !(readl(reg_opcr) & OPCR_SPENDH) &&
+		(readl(reg_usbpcr1) & USBPCR1_UHC_POWER);
+}
+
+static const struct clk_ops jz4770_uhc_phy_ops = {
+	.enable = jz4770_uhc_phy_enable,
+	.disable = jz4770_uhc_phy_disable,
+	.is_enabled = jz4770_uhc_phy_is_enabled,
+};
+
+static int jz4770_otg_phy_enable(struct clk_hw *hw)
+{
+	void __iomem *reg_opcr		= cgu->base + CGU_REG_OPCR;
+
+	writel(readl(reg_opcr) | OPCR_SPENDN, reg_opcr);
+
+	/* Wait for the clock to be stable */
+	udelay(50);
+	return 0;
+}
+
+static void jz4770_otg_phy_disable(struct clk_hw *hw)
+{
+	void __iomem *reg_opcr		= cgu->base + CGU_REG_OPCR;
+
+	writel(readl(reg_opcr) & ~OPCR_SPENDN, reg_opcr);
+}
+
+static int jz4770_otg_phy_is_enabled(struct clk_hw *hw)
+{
+	void __iomem *reg_opcr		= cgu->base + CGU_REG_OPCR;
+
+	return !!(readl(reg_opcr) & OPCR_SPENDN);
+}
+
+static const struct clk_ops jz4770_otg_phy_ops = {
+	.enable = jz4770_otg_phy_enable,
+	.disable = jz4770_otg_phy_disable,
+	.is_enabled = jz4770_otg_phy_is_enabled,
+};
+
+static const s8 pll_od_encoding[8] = {
+	0x0, 0x1, -1, 0x2, -1, -1, -1, 0x3,
+};
+
+static const struct ingenic_cgu_clk_info jz4770_cgu_clocks[] = {
+
+	/* External clocks */
+
+	[JZ4770_CLK_EXT] = { "ext", CGU_CLK_EXT },
+	[JZ4770_CLK_OSC32K] = { "osc32k", CGU_CLK_EXT },
+
+	/* PLLs */
+
+	[JZ4770_CLK_PLL0] = {
+		"pll0", CGU_CLK_PLL,
+		.parents = { JZ4770_CLK_EXT },
+		.pll = {
+			.reg = CGU_REG_CPPCR0,
+			.m_shift = 24,
+			.m_bits = 7,
+			.m_offset = 1,
+			.n_shift = 18,
+			.n_bits = 5,
+			.n_offset = 1,
+			.od_shift = 16,
+			.od_bits = 2,
+			.od_max = 8,
+			.od_encoding = pll_od_encoding,
+			.bypass_bit = 9,
+			.enable_bit = 8,
+			.stable_bit = 10,
+		},
+	},
+
+	[JZ4770_CLK_PLL1] = {
+		/* TODO: PLL1 can depend on PLL0 */
+		"pll1", CGU_CLK_PLL,
+		.parents = { JZ4770_CLK_EXT },
+		.pll = {
+			.reg = CGU_REG_CPPCR1,
+			.m_shift = 24,
+			.m_bits = 7,
+			.m_offset = 1,
+			.n_shift = 18,
+			.n_bits = 5,
+			.n_offset = 1,
+			.od_shift = 16,
+			.od_bits = 2,
+			.od_max = 8,
+			.od_encoding = pll_od_encoding,
+			.enable_bit = 7,
+			.stable_bit = 6,
+			.no_bypass_bit = true,
+		},
+	},
+
+	/* Main clocks */
+
+	[JZ4770_CLK_CCLK] = {
+		"cclk", CGU_CLK_DIV,
+		.parents = { JZ4770_CLK_PLL0, },
+		.div = { CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1 },
+	},
+	[JZ4770_CLK_H0CLK] = {
+		"h0clk", CGU_CLK_DIV,
+		.parents = { JZ4770_CLK_PLL0, },
+		.div = { CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1 },
+	},
+	[JZ4770_CLK_H1CLK] = {
+		"h1clk", CGU_CLK_DIV | CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_PLL0, },
+		.div = { CGU_REG_CPCCR, 24, 1, 4, 22, -1, -1 },
+		.gate = { CGU_REG_LCR, 30 },
+	},
+	[JZ4770_CLK_H2CLK] = {
+		"h2clk", CGU_CLK_DIV,
+		.parents = { JZ4770_CLK_PLL0, },
+		.div = { CGU_REG_CPCCR, 16, 1, 4, 22, -1, -1 },
+	},
+	[JZ4770_CLK_C1CLK] = {
+		"c1clk", CGU_CLK_DIV,
+		.parents = { JZ4770_CLK_PLL0, },
+		.div = { CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1 },
+	},
+	[JZ4770_CLK_PCLK] = {
+		"pclk", CGU_CLK_DIV,
+		.parents = { JZ4770_CLK_PLL0, },
+		.div = { CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1 },
+	},
+
+	/* Those divided clocks can connect to PLL0 or PLL1 */
+
+	[JZ4770_CLK_MMC0_MUX] = {
+		"mmc0_mux", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, },
+		.mux = { CGU_REG_MSC0CDR, 30, 1 },
+		.div = { CGU_REG_MSC0CDR, 0, 1, 7, -1, -1, 31 },
+		.gate = { CGU_REG_MSC0CDR, 31 },
+	},
+	[JZ4770_CLK_MMC1_MUX] = {
+		"mmc1_mux", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, },
+		.mux = { CGU_REG_MSC1CDR, 30, 1 },
+		.div = { CGU_REG_MSC1CDR, 0, 1, 7, -1, -1, 31 },
+		.gate = { CGU_REG_MSC1CDR, 31 },
+	},
+	[JZ4770_CLK_MMC2_MUX] = {
+		"mmc2_mux", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, },
+		.mux = { CGU_REG_MSC2CDR, 30, 1 },
+		.div = { CGU_REG_MSC2CDR, 0, 1, 7, -1, -1, 31 },
+		.gate = { CGU_REG_MSC2CDR, 31 },
+	},
+	[JZ4770_CLK_CIM] = {
+		"cim", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, },
+		.mux = { CGU_REG_CIMCDR, 31, 1 },
+		.div = { CGU_REG_CIMCDR, 0, 1, 8, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR0, 26 },
+	},
+	[JZ4770_CLK_UHC] = {
+		"uhc", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, },
+		.mux = { CGU_REG_UHCCDR, 29, 1 },
+		.div = { CGU_REG_UHCCDR, 0, 1, 4, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR0, 24 },
+	},
+	[JZ4770_CLK_GPU] = {
+		"gpu", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, -1 },
+		.mux = { CGU_REG_GPUCDR, 31, 1 },
+		.div = { CGU_REG_GPUCDR, 0, 1, 3, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR1, 9 },
+	},
+	[JZ4770_CLK_BCH] = {
+		"bch", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, },
+		.mux = { CGU_REG_BCHCDR, 31, 1 },
+		.div = { CGU_REG_BCHCDR, 0, 1, 3, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR0, 1 },
+	},
+	[JZ4770_CLK_LPCLK_MUX] = {
+		"lpclk", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, },
+		.mux = { CGU_REG_LPCDR, 29, 1 },
+		.div = { CGU_REG_LPCDR, 0, 1, 11, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR0, 28 },
+	},
+	[JZ4770_CLK_GPS] = {
+		"gps", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_PLL0, JZ4770_CLK_PLL1, },
+		.mux = { CGU_REG_GPSCDR, 31, 1 },
+		.div = { CGU_REG_GPSCDR, 0, 1, 4, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR0, 22 },
+	},
+
+	/* Those divided clocks can connect to EXT, PLL0 or PLL1 */
+
+	[JZ4770_CLK_SSI_MUX] = {
+		"ssi_mux", CGU_CLK_DIV | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_EXT, -1,
+			JZ4770_CLK_PLL0, JZ4770_CLK_PLL1 },
+		.mux = { CGU_REG_SSICDR, 30, 2 },
+		.div = { CGU_REG_SSICDR, 0, 1, 6, -1, -1, -1 },
+	},
+	[JZ4770_CLK_PCM_MUX] = {
+		"pcm_mux", CGU_CLK_DIV | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_EXT, -1,
+			JZ4770_CLK_PLL0, JZ4770_CLK_PLL1 },
+		.mux = { CGU_REG_PCMCDR, 30, 2 },
+		.div = { CGU_REG_PCMCDR, 0, 1, 9, -1, -1, -1 },
+	},
+	[JZ4770_CLK_I2S] = {
+		"i2s", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_EXT, -1,
+			JZ4770_CLK_PLL0, JZ4770_CLK_PLL1 },
+		.mux = { CGU_REG_I2SCDR, 30, 2 },
+		.div = { CGU_REG_I2SCDR, 0, 1, 9, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR1, 13 },
+	},
+	[JZ4770_CLK_OTG] = {
+		"usb", CGU_CLK_DIV | CGU_CLK_GATE | CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_EXT, -1,
+			JZ4770_CLK_PLL0, JZ4770_CLK_PLL1 },
+		.mux = { CGU_REG_USBCDR, 30, 2 },
+		.div = { CGU_REG_USBCDR, 0, 1, 8, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR0, 2 },
+	},
+
+	/* Gate-only clocks */
+
+	[JZ4770_CLK_SSI0] = {
+		"ssi0", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_SSI_MUX, },
+		.gate = { CGU_REG_CLKGR0, 4 },
+	},
+	[JZ4770_CLK_SSI1] = {
+		"ssi1", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_SSI_MUX, },
+		.gate = { CGU_REG_CLKGR0, 19 },
+	},
+	[JZ4770_CLK_SSI2] = {
+		"ssi2", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_SSI_MUX, },
+		.gate = { CGU_REG_CLKGR0, 20 },
+	},
+	[JZ4770_CLK_PCM0] = {
+		"pcm0", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_PCM_MUX, },
+		.gate = { CGU_REG_CLKGR1, 8 },
+	},
+	[JZ4770_CLK_PCM1] = {
+		"pcm1", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_PCM_MUX, },
+		.gate = { CGU_REG_CLKGR1, 10 },
+	},
+	[JZ4770_CLK_DMA] = {
+		"dma", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_H2CLK, },
+		.gate = { CGU_REG_CLKGR0, 21 },
+	},
+	[JZ4770_CLK_I2C0] = {
+		"i2c0", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR0, 5 },
+	},
+	[JZ4770_CLK_I2C1] = {
+		"i2c1", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR0, 6 },
+	},
+	[JZ4770_CLK_I2C2] = {
+		"i2c2", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR1, 15 },
+	},
+	[JZ4770_CLK_UART0] = {
+		"uart0", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR0, 15 },
+	},
+	[JZ4770_CLK_UART1] = {
+		"uart1", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR0, 16 },
+	},
+	[JZ4770_CLK_UART2] = {
+		"uart2", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR0, 17 },
+	},
+	[JZ4770_CLK_UART3] = {
+		"uart3", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR0, 18 },
+	},
+	[JZ4770_CLK_IPU] = {
+		"ipu", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_H0CLK, },
+		.gate = { CGU_REG_CLKGR0, 29 },
+	},
+	[JZ4770_CLK_ADC] = {
+		"adc", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR0, 14 },
+	},
+	[JZ4770_CLK_AIC] = {
+		"aic", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_EXT, },
+		.gate = { CGU_REG_CLKGR0, 8 },
+	},
+	[JZ4770_CLK_AUX] = {
+		"aux", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_C1CLK, },
+		.gate = { CGU_REG_CLKGR1, 14 },
+	},
+	[JZ4770_CLK_VPU] = {
+		"vpu", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_H1CLK, },
+		.gate = { CGU_REG_CLKGR1, 7 },
+	},
+	[JZ4770_CLK_MMC0] = {
+		"mmc0", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_MMC0_MUX, },
+		.gate = { CGU_REG_CLKGR0, 3 },
+	},
+	[JZ4770_CLK_MMC1] = {
+		"mmc1", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_MMC1_MUX, },
+		.gate = { CGU_REG_CLKGR0, 11 },
+	},
+	[JZ4770_CLK_MMC2] = {
+		"mmc2", CGU_CLK_GATE,
+		.parents = { JZ4770_CLK_MMC2_MUX, },
+		.gate = { CGU_REG_CLKGR0, 12 },
+	},
+
+	/* Custom clocks */
+
+	[JZ4770_CLK_UHC_PHY] = {
+		"uhc_phy", CGU_CLK_CUSTOM,
+		.parents = { JZ4770_CLK_UHC, -1, -1, -1 },
+		.custom = { &jz4770_uhc_phy_ops },
+	},
+	[JZ4770_CLK_OTG_PHY] = {
+		"usb_phy", CGU_CLK_CUSTOM,
+		.parents = { JZ4770_CLK_OTG, -1, -1, -1 },
+		.custom = { &jz4770_otg_phy_ops },
+	},
+
+	[JZ4770_CLK_EXT512] = {
+		"ext/512", CGU_CLK_FIXDIV,
+		.parents = { JZ4770_CLK_EXT },
+		.fixdiv = { 512 },
+	},
+
+	[JZ4770_CLK_RTC] = {
+		"rtc", CGU_CLK_MUX,
+		.parents = { JZ4770_CLK_EXT512, JZ4770_CLK_OSC32K, },
+		.mux = { CGU_REG_OPCR, 2, 1},
+	},
+};
+
+#if IS_ENABLED(CONFIG_PM_SLEEP)
+static int jz4770_cgu_pm_suspend(void)
+{
+	u32 val;
+
+	val = readl(cgu->base + CGU_REG_LCR);
+	writel(val | LCR_LPM, cgu->base + CGU_REG_LCR);
+	return 0;
+}
+
+static void jz4770_cgu_pm_resume(void)
+{
+	u32 val;
+
+	val = readl(cgu->base + CGU_REG_LCR);
+	writel(val & ~LCR_LPM, cgu->base + CGU_REG_LCR);
+}
+
+static struct syscore_ops jz4770_cgu_pm_ops = {
+	.suspend = jz4770_cgu_pm_suspend,
+	.resume = jz4770_cgu_pm_resume,
+};
+#endif /* CONFIG_PM_SLEEP */
+
+static void __init jz4770_cgu_init(struct device_node *np)
+{
+	int retval;
+
+	cgu = ingenic_cgu_new(jz4770_cgu_clocks,
+			      ARRAY_SIZE(jz4770_cgu_clocks), np);
+	if (!cgu)
+		pr_err("%s: failed to initialise CGU\n", __func__);
+
+	retval = ingenic_cgu_register_clocks(cgu);
+	if (retval)
+		pr_err("%s: failed to register CGU Clocks\n", __func__);
+
+#if IS_ENABLED(CONFIG_PM_SLEEP)
+	register_syscore_ops(&jz4770_cgu_pm_ops);
+#endif
+}
+
+/* We only probe via devicetree, no need for a platform driver */
+CLK_OF_DECLARE(jz4770_cgu, "ingenic,jz4770-cgu", jz4770_cgu_init);