rockchip: rk3066: add clock driver for rk3066 soc

Add the clock driver for the rk3066 platform.

Derived from the rk3288 and rk3188 driver it
supports only a bare minimum to bring up the system
to reduce the TPL size for:
  SDRAM clock configuration.
  The boot devices NAND, EMMC, SDMMC, SPI.
  A UART for the debug messages (fixed) at 115200n8.
  A SARADC for the recovery button.
  A TIMER for the delays (fixed).

There's support for two possible frequencies,
the safe 600MHz which will work with default pmic settings and
will be set to get away from the 24MHz default and
the maximum of 1.416Ghz, which boards can set if they
were able to get pmic support for it.

After the clock tree is set during the TPL probe
there's no parent update support.

In OF_REAL mode the drivers ns16550.c and dw-apb-timer.c
obtain the (fixed) clk_get_rate from the clock driver
instead of platdata.

The rk3066 cru node has a number of assigned-clocks properties
that call the .set_rate() function. Add them to the list so that
they return a 0 instead of -ENOENT.

Signed-off-by: Paweł Jarosz <paweljarosz3691@gmail.com>
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

1 files changed, 157 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-rockchip/cru_rk3066.h b/arch/arm/include/asm/arch-rockchip/cru_rk3066.h
new file mode 100644
index 00000000000..76a715a8e6a
--- /dev/null
+++ b/arch/arm/include/asm/arch-rockchip/cru_rk3066.h
@@ -0,0 +1,157 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2021 Paweł Jarosz <paweljarosz3691@gmail.com>
+ */
+
+#ifndef _ASM_ARCH_CRU_RK3066_H
+#define _ASM_ARCH_CRU_RK3066_H
+
+#include <linux/bitops.h>
+#include <linux/bitfield.h>
+
+#define REG(name, h, l) \
+	name##_MASK = GENMASK(h, l), \
+	name##_SHIFT = __bf_shf(name##_MASK)
+
+#define OSC_HZ		(24 * 1000 * 1000)
+
+#define APLL_HZ		(1416 * 1000000)
+#define APLL_SAFE_HZ	(600 * 1000000)
+#define GPLL_HZ		(594 * 1000000)
+#define CPLL_HZ		(384 * 1000000)
+
+/* The SRAM is clocked off aclk_cpu, so we want to max it out for boot speed */
+#define CPU_ACLK_HZ	297000000
+#define CPU_HCLK_HZ	148500000
+#define CPU_PCLK_HZ	74250000
+#define CPU_H2P_HZ	74250000
+
+#define PERI_ACLK_HZ	148500000
+#define PERI_HCLK_HZ	148500000
+#define PERI_PCLK_HZ	74250000
+
+/* Private data for the clock driver - used by rockchip_get_cru() */
+struct rk3066_clk_priv {
+	struct rk3066_grf *grf;
+	struct rk3066_cru *cru;
+	ulong rate;
+	bool has_bwadj;
+};
+
+struct rk3066_cru {
+	struct rk3066_pll {
+		u32 con0;
+		u32 con1;
+		u32 con2;
+		u32 con3;
+	} pll[4];
+	u32 cru_mode_con;
+	u32 cru_clksel_con[35];
+	u32 cru_clkgate_con[10];
+	u32 reserved1[2];
+	u32 cru_glb_srst_fst_value;
+	u32 cru_glb_srst_snd_value;
+	u32 reserved2[2];
+	u32 cru_softrst_con[9];
+	u32 cru_misc_con;
+	u32 reserved3[2];
+	u32 cru_glb_cnt_th;
+};
+
+check_member(rk3066_cru, cru_glb_cnt_th, 0x0140);
+
+/* CRU_CLKSEL0_CON */
+enum {
+	REG(CPU_ACLK_PLL, 8, 8),
+	CPU_ACLK_PLL_SELECT_APLL	= 0,
+	CPU_ACLK_PLL_SELECT_GPLL,
+
+	REG(CORE_PERI_DIV, 7, 6),
+
+	REG(A9_CORE_DIV, 4, 0),
+};
+
+/* CRU_CLKSEL1_CON */
+enum {
+	REG(AHB2APB_DIV, 15, 14),
+
+	REG(CPU_PCLK_DIV, 13, 12),
+
+	REG(CPU_HCLK_DIV, 9, 8),
+
+	REG(CPU_ACLK_DIV, 2, 0),
+};
+
+/* CRU_CLKSEL10_CON */
+enum {
+	REG(PERI_SEL_PLL, 15, 15),
+	PERI_SEL_CPLL		= 0,
+	PERI_SEL_GPLL,
+
+	REG(PERI_PCLK_DIV, 13, 12),
+
+	REG(PERI_HCLK_DIV, 9, 8),
+
+	REG(PERI_ACLK_DIV, 4, 0),
+};
+
+/* CRU_CLKSEL11_CON */
+enum {
+	REG(MMC0_DIV, 5, 0),
+};
+
+/* CRU_CLKSEL12_CON */
+enum {
+	REG(UART_PLL, 15, 15),
+	UART_PLL_SELECT_GENERAL	= 0,
+	UART_PLL_SELECT_CODEC,
+
+	REG(EMMC_DIV, 13, 8),
+
+	REG(SDIO_DIV, 5, 0),
+};
+
+/* CRU_CLKSEL24_CON */
+enum {
+	REG(SARADC_DIV, 15, 8),
+};
+
+/* CRU_CLKSEL25_CON */
+enum {
+	REG(SPI1_DIV, 14, 8),
+
+	REG(SPI0_DIV, 6, 0),
+};
+
+/* CRU_CLKSEL34_CON */
+enum {
+	REG(TSADC_DIV, 15, 0),
+};
+
+/* CRU_MODE_CON */
+enum {
+	REG(GPLL_MODE, 13, 12),
+
+	REG(CPLL_MODE, 9, 8),
+
+	REG(DPLL_MODE, 5, 4),
+
+	REG(APLL_MODE, 1, 0),
+	PLL_MODE_SLOW		= 0,
+	PLL_MODE_NORMAL,
+	PLL_MODE_DEEP,
+};
+
+/* CRU_APLL_CON0 */
+enum {
+	REG(CLKR, 13, 8),
+
+	REG(CLKOD, 3, 0),
+};
+
+/* CRU_APLL_CON1 */
+enum {
+	REG(CLKF, 12, 0),
+};
+
+#endif