clk: imx: add i.IMXRT1020 clk driver

Add i.MXRT1020 clk driver support.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>

3 files changed, 244 insertions, 0 deletions

diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
index 059bc2fbb95..96721bcbf3b 100644
--- a/drivers/clk/imx/Kconfig
+++ b/drivers/clk/imx/Kconfig
@@ -69,6 +69,22 @@ config CLK_IMX8MP
 	help
 	  This enables support clock driver for i.MX8MP platforms.
 
+config SPL_CLK_IMXRT1020
+	bool "SPL clock support for i.MXRT1020"
+	depends on ARCH_IMXRT && SPL
+	select SPL_CLK
+	select SPL_CLK_CCF
+	help
+	  This enables SPL DM/DTS support for clock driver in i.MXRT1020
+
+config CLK_IMXRT1020
+	bool "Clock support for i.MXRT1020"
+	depends on ARCH_IMXRT
+	select CLK
+	select CLK_CCF
+	help
+	  This enables support clock driver for i.MXRT1020 platforms.
+
 config SPL_CLK_IMXRT1050
 	bool "SPL clock support for i.MXRT1050"
 	depends on ARCH_IMXRT && SPL
diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
index 1e8a49d0f33..01bbbdf3aea 100644
--- a/drivers/clk/imx/Makefile
+++ b/drivers/clk/imx/Makefile
@@ -17,4 +17,5 @@ obj-$(CONFIG_$(SPL_TPL_)CLK_IMX8MN) += clk-imx8mn.o clk-pll14xx.o \
 obj-$(CONFIG_$(SPL_TPL_)CLK_IMX8MP) += clk-imx8mp.o clk-pll14xx.o \
 				clk-composite-8m.o
 
+obj-$(CONFIG_$(SPL_TPL_)CLK_IMXRT1020) += clk-imxrt1020.o
 obj-$(CONFIG_$(SPL_TPL_)CLK_IMXRT1050) += clk-imxrt1050.o
diff --git a/drivers/clk/imx/clk-imxrt1020.c b/drivers/clk/imx/clk-imxrt1020.c
new file mode 100644
index 00000000000..840f783940f
--- /dev/null
+++ b/drivers/clk/imx/clk-imxrt1020.c
@@ -0,0 +1,227 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright(C) 2020
+ * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
+#include <dt-bindings/clock/imxrt1020-clock.h>
+
+#include "clk.h"
+
+static ulong imxrt1020_clk_get_rate(struct clk *clk)
+{
+	struct clk *c;
+	int ret;
+
+	debug("%s(#%lu)\n", __func__, clk->id);
+
+	ret = clk_get_by_id(clk->id, &c);
+	if (ret)
+		return ret;
+
+	return clk_get_rate(c);
+}
+
+static ulong imxrt1020_clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	struct clk *c;
+	int ret;
+
+	debug("%s(#%lu), rate: %lu\n", __func__, clk->id, rate);
+
+	ret = clk_get_by_id(clk->id, &c);
+	if (ret)
+		return ret;
+
+	return clk_set_rate(c, rate);
+}
+
+static int __imxrt1020_clk_enable(struct clk *clk, bool enable)
+{
+	struct clk *c;
+	int ret;
+
+	debug("%s(#%lu) en: %d\n", __func__, clk->id, enable);
+
+	ret = clk_get_by_id(clk->id, &c);
+	if (ret)
+		return ret;
+
+	if (enable)
+		ret = clk_enable(c);
+	else
+		ret = clk_disable(c);
+
+	return ret;
+}
+
+static int imxrt1020_clk_disable(struct clk *clk)
+{
+	return __imxrt1020_clk_enable(clk, 0);
+}
+
+static int imxrt1020_clk_enable(struct clk *clk)
+{
+	return __imxrt1020_clk_enable(clk, 1);
+}
+
+static struct clk_ops imxrt1020_clk_ops = {
+	.set_rate = imxrt1020_clk_set_rate,
+	.get_rate = imxrt1020_clk_get_rate,
+	.enable = imxrt1020_clk_enable,
+	.disable = imxrt1020_clk_disable,
+};
+
+static const char * const pll2_bypass_sels[] = {"pll2_sys", "osc", };
+static const char * const pll3_bypass_sels[] = {"pll3_usb_otg", "osc", };
+
+static const char *const pre_periph_sels[] = { "pll2_sys", "pll2_pfd3_297m", "pll3_pfd3_454_74m", "arm_podf", };
+static const char *const periph_sels[] = { "pre_periph_sel", "todo", };
+static const char *const usdhc_sels[] = { "pll2_pfd2_396m", "pll2_pfd0_352m", };
+static const char *const lpuart_sels[] = { "pll3_80m", "osc", };
+static const char *const semc_alt_sels[] = { "pll2_pfd2_396m", "pll3_pfd1_664_62m", };
+static const char *const semc_sels[] = { "periph_sel", "semc_alt_sel", };
+
+static int imxrt1020_clk_probe(struct udevice *dev)
+{
+	void *base;
+
+	/* Anatop clocks */
+	base = (void *)ANATOP_BASE_ADDR;
+
+	clk_dm(IMXRT1020_CLK_PLL2_SYS,
+	       imx_clk_pllv3(IMX_PLLV3_GENERIC, "pll2_sys", "osc",
+			     base + 0x30, 0x1));
+	clk_dm(IMXRT1020_CLK_PLL3_USB_OTG,
+	       imx_clk_pllv3(IMX_PLLV3_USB, "pll3_usb_otg", "osc",
+			     base + 0x10, 0x1));
+
+	/* PLL bypass out */
+	clk_dm(IMXRT1020_CLK_PLL2_BYPASS,
+	       imx_clk_mux_flags("pll2_bypass", base + 0x30, 16, 1,
+				 pll2_bypass_sels,
+				 ARRAY_SIZE(pll2_bypass_sels),
+				 CLK_SET_RATE_PARENT));
+	clk_dm(IMXRT1020_CLK_PLL3_BYPASS,
+	       imx_clk_mux_flags("pll3_bypass", base + 0x10, 16, 1,
+				 pll3_bypass_sels,
+				 ARRAY_SIZE(pll3_bypass_sels),
+				 CLK_SET_RATE_PARENT));
+
+	clk_dm(IMXRT1020_CLK_PLL3_80M,
+	       imx_clk_fixed_factor("pll3_80m",  "pll3_usb_otg",   1, 6));
+
+	clk_dm(IMXRT1020_CLK_PLL2_PFD0_352M,
+	       imx_clk_pfd("pll2_pfd0_352m", "pll2_sys", base + 0x100, 0));
+	clk_dm(IMXRT1020_CLK_PLL2_PFD1_594M,
+	       imx_clk_pfd("pll2_pfd1_594m", "pll2_sys", base + 0x100, 1));
+	clk_dm(IMXRT1020_CLK_PLL2_PFD2_396M,
+	       imx_clk_pfd("pll2_pfd2_396m", "pll2_sys", base + 0x100, 2));
+	clk_dm(IMXRT1020_CLK_PLL2_PFD3_297M,
+	       imx_clk_pfd("pll2_pfd3_297m", "pll2_sys", base + 0x100, 3));
+	clk_dm(IMXRT1020_CLK_PLL3_PFD1_664_62M,
+	       imx_clk_pfd("pll3_pfd1_664_62m", "pll3_usb_otg", base + 0xf0, 1));
+	clk_dm(IMXRT1020_CLK_PLL3_PFD3_454_74M,
+	       imx_clk_pfd("pll3_pfd3_454_74m", "pll3_usb_otg", base + 0xf0, 3));
+
+	/* CCM clocks */
+	base = dev_read_addr_ptr(dev);
+	if (base == (void *)FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	clk_dm(IMXRT1020_CLK_PRE_PERIPH_SEL,
+	       imx_clk_mux("pre_periph_sel", base + 0x18, 18, 2,
+			   pre_periph_sels, ARRAY_SIZE(pre_periph_sels)));
+	clk_dm(IMXRT1020_CLK_PERIPH_SEL,
+	       imx_clk_mux("periph_sel", base + 0x14, 25, 1,
+			   periph_sels, ARRAY_SIZE(periph_sels)));
+	clk_dm(IMXRT1020_CLK_USDHC1_SEL,
+	       imx_clk_mux("usdhc1_sel", base + 0x1c, 16, 1,
+			   usdhc_sels, ARRAY_SIZE(usdhc_sels)));
+	clk_dm(IMXRT1020_CLK_USDHC2_SEL,
+	       imx_clk_mux("usdhc2_sel", base + 0x1c, 17, 1,
+			   usdhc_sels, ARRAY_SIZE(usdhc_sels)));
+	clk_dm(IMXRT1020_CLK_LPUART_SEL,
+	       imx_clk_mux("lpuart_sel", base + 0x24, 6, 1,
+			   lpuart_sels, ARRAY_SIZE(lpuart_sels)));
+	clk_dm(IMXRT1020_CLK_SEMC_ALT_SEL,
+	       imx_clk_mux("semc_alt_sel", base + 0x14, 7, 1,
+			   semc_alt_sels, ARRAY_SIZE(semc_alt_sels)));
+	clk_dm(IMXRT1020_CLK_SEMC_SEL,
+	       imx_clk_mux("semc_sel", base + 0x14, 6, 1,
+			   semc_sels, ARRAY_SIZE(semc_sels)));
+
+	clk_dm(IMXRT1020_CLK_AHB_PODF,
+	       imx_clk_divider("ahb_podf", "periph_sel",
+			       base + 0x14, 10, 3));
+	clk_dm(IMXRT1020_CLK_USDHC1_PODF,
+	       imx_clk_divider("usdhc1_podf", "usdhc1_sel",
+			       base + 0x24, 11, 3));
+	clk_dm(IMXRT1020_CLK_USDHC2_PODF,
+	       imx_clk_divider("usdhc2_podf", "usdhc2_sel",
+			       base + 0x24, 16, 3));
+	clk_dm(IMXRT1020_CLK_LPUART_PODF,
+	       imx_clk_divider("lpuart_podf", "lpuart_sel",
+			       base + 0x24, 0, 6));
+	clk_dm(IMXRT1020_CLK_SEMC_PODF,
+	       imx_clk_divider("semc_podf", "semc_sel",
+			       base + 0x14, 16, 3));
+
+	clk_dm(IMXRT1020_CLK_USDHC1,
+	       imx_clk_gate2("usdhc1", "usdhc1_podf", base + 0x80, 2));
+	clk_dm(IMXRT1020_CLK_USDHC2,
+	       imx_clk_gate2("usdhc2", "usdhc2_podf", base + 0x80, 4));
+	clk_dm(IMXRT1020_CLK_LPUART1,
+	       imx_clk_gate2("lpuart1", "lpuart_podf", base + 0x7c, 24));
+	clk_dm(IMXRT1020_CLK_SEMC,
+	       imx_clk_gate2("semc", "semc_podf", base + 0x74, 4));
+
+#ifdef CONFIG_SPL_BUILD
+	struct clk *clk, *clk1;
+
+	clk_get_by_id(IMXRT1020_CLK_SEMC_SEL, &clk1);
+	clk_get_by_id(IMXRT1020_CLK_SEMC_ALT_SEL, &clk);
+	clk_set_parent(clk1, clk);
+
+	/* Configure PLL3_USB_OTG to 480MHz */
+	clk_get_by_id(IMXRT1020_CLK_PLL3_USB_OTG, &clk);
+	clk_enable(clk);
+	clk_set_rate(clk, 480000000UL);
+
+	clk_get_by_id(IMXRT1020_CLK_PLL3_BYPASS, &clk1);
+	clk_set_parent(clk1, clk);
+
+	clk_get_by_id(IMXRT1020_CLK_PLL2_PFD3_297M, &clk);
+	clk_set_rate(clk, 297000000UL);
+
+	clk_get_by_id(IMXRT1020_CLK_PLL2_SYS, &clk);
+	clk_enable(clk);
+	clk_set_rate(clk, 528000000UL);
+
+	clk_get_by_id(IMXRT1020_CLK_PLL2_BYPASS, &clk1);
+	clk_set_parent(clk1, clk);
+
+#endif
+
+	return 0;
+}
+
+static const struct udevice_id imxrt1020_clk_ids[] = {
+	{ .compatible = "fsl,imxrt1020-ccm" },
+	{ },
+};
+
+U_BOOT_DRIVER(imxrt1020_clk) = {
+	.name = "clk_imxrt1020",
+	.id = UCLASS_CLK,
+	.of_match = imxrt1020_clk_ids,
+	.ops = &imxrt1020_clk_ops,
+	.probe = imxrt1020_clk_probe,
+	.flags = DM_FLAG_PRE_RELOC,
+};