From 57e7623776101ee7913997691e09436a393028d5 Mon Sep 17 00:00:00 2001
From: Jernej Skrabec <jernej.skrabec@siol.net>
Date: Mon, 11 Jan 2021 21:11:38 +0100
Subject: [PATCH] sunxi: Add support for I2C on H6 like SoCs
I2C support, especially R_I2C port, will be needed in future. Upcoming
support for H616 will need R_I2C to adjust DRAM voltage.
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Reviewed-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
.../include/asm/arch-sunxi/clock_sun50i_h6.h | 1 +
arch/arm/mach-sunxi/Kconfig | 2 +-
arch/arm/mach-sunxi/clock_sun50i_h6.c | 29 +++++++++++++++++++
3 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h b/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
index 426069fc69..e83e84ab6c 100644
--- a/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
+++ b/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
@@ -297,6 +297,7 @@ struct sunxi_ccm_reg {
/* Module gate/reset shift*/
#define RESET_SHIFT (16)
+#define GATE_SHIFT (0)
/* DRAM clock bit field */
#define DRAM_MOD_RESET BIT(30)
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index 36b142588f..edb9973cf2 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -730,7 +730,7 @@ config I2C3_ENABLE
See I2C0_ENABLE help text.
endif
-if SUNXI_GEN_SUN6I
+if SUNXI_GEN_SUN6I || SUN50I_GEN_H6
config R_I2C_ENABLE
bool "Enable the PRCM I2C/TWI controller"
# This is used for the pmic on H3
diff --git a/arch/arm/mach-sunxi/clock_sun50i_h6.c b/arch/arm/mach-sunxi/clock_sun50i_h6.c
index ba8a26eb0d..6bd466915c 100644
--- a/arch/arm/mach-sunxi/clock_sun50i_h6.c
+++ b/arch/arm/mach-sunxi/clock_sun50i_h6.c
@@ -2,6 +2,7 @@
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/clock.h>
+#include <asm/arch/prcm.h>
#ifdef CONFIG_SPL_BUILD
void clock_init_safe(void)
@@ -92,3 +93,31 @@ unsigned int clock_get_pll6(void)
/* The register defines PLL6-4X, not plain PLL6 */
return 24000000 / 4 * n / div1 / div2;
}
+
+int clock_twi_onoff(int port, int state)
+{
+ struct sunxi_ccm_reg *const ccm =
+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+ struct sunxi_prcm_reg *const prcm =
+ (struct sunxi_prcm_reg *)SUNXI_PRCM_BASE;
+ u32 value, *ptr;
+ int shift;
+
+ value = BIT(GATE_SHIFT) | BIT (RESET_SHIFT);
+
+ if (port == 5) {
+ shift = 0;
+ ptr = &prcm->twi_gate_reset;
+ } else {
+ shift = port;
+ ptr = &ccm->twi_gate_reset;
+ }
+
+ /* set the apb clock gate and reset for twi */
+ if (state)
+ setbits_le32(ptr, value << shift);
+ else
+ clrbits_le32(ptr, value << shift);
+
+ return 0;
+}
--
2.39.5