This bus controller is used to communicate with an X-Powers AXP PMIC. Currently, various drivers access PMIC registers through a platform- specific non-DM "pmic_bus" interface, which depends on the legacy I2C framework. In order to convert those drivers to use DM_PMIC, this bus needs a DM_I2C driver.
Since the non-DM bus controller driver is still needed in SPL, the quick solution is to implement the DM_I2C ops using the existing functions.
The register for switching between I2C/P2WI/RSB mode is the same across all PMIC variants, so move that to the common header.
Signed-off-by: Samuel Holland samuel@sholland.org ---
arch/arm/mach-sunxi/Kconfig | 11 ------ arch/arm/mach-sunxi/pmic_bus.c | 7 ++-- drivers/i2c/Kconfig | 8 +++++ drivers/i2c/Makefile | 1 + drivers/i2c/sun6i_p2wi.c | 66 ++++++++++++++++++++++++++++++++++ include/axp_pmic.h | 6 ++++ 6 files changed, 84 insertions(+), 15 deletions(-) create mode 100644 drivers/i2c/sun6i_p2wi.c
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig index 79c669a4813..37076c2dfb3 100644 --- a/arch/arm/mach-sunxi/Kconfig +++ b/arch/arm/mach-sunxi/Kconfig @@ -88,17 +88,6 @@ config DRAM_SUN50I_H616_UNKNOWN_FEATURE feature. endif
-config SUN6I_P2WI - bool "Allwinner sun6i internal P2WI controller" - help - If you say yes to this option, support will be included for the - P2WI (Push/Pull 2 Wire Interface) controller embedded in some sunxi - SOCs. - The P2WI looks like an SMBus controller (which supports only byte - accesses), except that it only supports one slave device. - This interface is used to connect to specific PMIC devices (like the - AXP221). - config SUN6I_PRCM bool help diff --git a/arch/arm/mach-sunxi/pmic_bus.c b/arch/arm/mach-sunxi/pmic_bus.c index 0394ce85644..673a05fdd16 100644 --- a/arch/arm/mach-sunxi/pmic_bus.c +++ b/arch/arm/mach-sunxi/pmic_bus.c @@ -8,6 +8,7 @@ * axp223 uses the rsb bus, these functions abstract this. */
+#include <axp_pmic.h> #include <common.h> #include <asm/arch/p2wi.h> #include <asm/arch/rsb.h> @@ -21,8 +22,6 @@ #define AXP305_I2C_ADDR 0x36
#define AXP221_CHIP_ADDR 0x68 -#define AXP221_CTRL_ADDR 0x3e -#define AXP221_INIT_DATA 0x3e
/* AXP818 device and runtime addresses are same as AXP223 */ #define AXP223_DEVICE_ADDR 0x3a3 @@ -40,8 +39,8 @@ int pmic_bus_init(void) #if defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || defined CONFIG_AXP818_POWER # ifdef CONFIG_MACH_SUN6I p2wi_init(); - ret = p2wi_change_to_p2wi_mode(AXP221_CHIP_ADDR, AXP221_CTRL_ADDR, - AXP221_INIT_DATA); + ret = p2wi_change_to_p2wi_mode(AXP221_CHIP_ADDR, AXP_PMIC_MODE_REG, + AXP_PMIC_MODE_P2WI); # elif defined CONFIG_MACH_SUN8I_R40 /* Nothing. R40 uses the AXP221s in I2C mode */ ret = 0; diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 5d27f503bfc..d082676c4b2 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -577,6 +577,14 @@ config SYS_I2C_STM32F7 _ Optional clock stretching _ Software reset
+config SUN6I_P2WI + bool "Allwinner sun6i P2WI controller" + depends on ARCH_SUNXI + help + Support for the P2WI (Push/Pull 2 Wire Interface) controller embedded + in the Allwinner A31 and A31s SOCs. This interface is used to connect + to specific devices like the X-Powers AXP221 PMIC. + config SYS_I2C_SYNQUACER bool "Socionext SynQuacer I2C controller" depends on ARCH_SYNQUACER && DM_I2C diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 3a7ecd9274b..2461f0a2db8 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_SYS_I2C_SANDBOX) += sandbox_i2c.o i2c-emul-uclass.o obj-$(CONFIG_SYS_I2C_SH) += sh_i2c.o obj-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o obj-$(CONFIG_SYS_I2C_STM32F7) += stm32f7_i2c.o +obj-$(CONFIG_SUN6I_P2WI) += sun6i_p2wi.o obj-$(CONFIG_SYS_I2C_SYNQUACER) += synquacer_i2c.o obj-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o obj-$(CONFIG_SYS_I2C_UNIPHIER) += i2c-uniphier.o diff --git a/drivers/i2c/sun6i_p2wi.c b/drivers/i2c/sun6i_p2wi.c new file mode 100644 index 00000000000..f1e8e5ed107 --- /dev/null +++ b/drivers/i2c/sun6i_p2wi.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <axp_pmic.h> +#include <dm.h> +#include <i2c.h> +#include <asm/arch/p2wi.h> + +#if CONFIG_IS_ENABLED(DM_I2C) + +static int sun6i_p2wi_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) +{ + /* The hardware only supports SMBus-style transfers. */ + if (nmsgs == 2 && msg[1].flags == I2C_M_RD && msg[1].len == 1) + return p2wi_read(msg[0].buf[0], msg[1].buf); + + if (nmsgs == 1 && msg[0].len == 2) + return p2wi_write(msg[0].buf[0], msg[0].buf[1]); + + return -EINVAL; +} + +static int sun6i_p2wi_probe_chip(struct udevice *bus, uint chip_addr, + uint chip_flags) +{ + return p2wi_change_to_p2wi_mode(chip_addr, + AXP_PMIC_MODE_REG, + AXP_PMIC_MODE_P2WI); +} + +static int sun6i_p2wi_probe(struct udevice *bus) +{ + p2wi_init(); + + return 0; +} + +static int sun6i_p2wi_child_pre_probe(struct udevice *child) +{ + struct dm_i2c_chip *chip = dev_get_parent_plat(child); + + /* Ensure each transfer is for a single register. */ + chip->flags |= DM_I2C_CHIP_RD_ADDRESS | DM_I2C_CHIP_WR_ADDRESS; + + return 0; +} + +static const struct dm_i2c_ops sun6i_p2wi_ops = { + .xfer = sun6i_p2wi_xfer, + .probe_chip = sun6i_p2wi_probe_chip, +}; + +static const struct udevice_id sun6i_p2wi_ids[] = { + { .compatible = "allwinner,sun6i-a31-p2wi" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(sun6i_p2wi) = { + .name = "sun6i_p2wi", + .id = UCLASS_I2C, + .of_match = sun6i_p2wi_ids, + .probe = sun6i_p2wi_probe, + .child_pre_probe = sun6i_p2wi_child_pre_probe, + .ops = &sun6i_p2wi_ops, +}; + +#endif /* CONFIG_IS_ENABLED(DM_I2C) */ diff --git a/include/axp_pmic.h b/include/axp_pmic.h index 405044c3a32..0db3e143eda 100644 --- a/include/axp_pmic.h +++ b/include/axp_pmic.h @@ -6,6 +6,8 @@ */ #ifndef _AXP_PMIC_H_
+#include <stdbool.h> + #ifdef CONFIG_AXP152_POWER #include <axp152.h> #endif @@ -25,6 +27,10 @@ #include <axp818.h> #endif
+#define AXP_PMIC_MODE_REG 0x3e +#define AXP_PMIC_MODE_I2C 0x00 +#define AXP_PMIC_MODE_P2WI 0x3e + int axp_set_dcdc1(unsigned int mvolt); int axp_set_dcdc2(unsigned int mvolt); int axp_set_dcdc3(unsigned int mvolt);