Add initial reset driver for Allwinner A31/A31s.
Implement reset deassert and assert functions for USB OHCI, EHCI, OTG and PHY bus reset and clock registers.
Signed-off-by: Jagan Teki jagan@amarulasolutions.com --- drivers/reset/sunxi/Kconfig | 7 ++ drivers/reset/sunxi/Makefile | 1 + drivers/reset/sunxi/reset_a31.c | 123 ++++++++++++++++++++++++++++++++ 3 files changed, 131 insertions(+) create mode 100644 drivers/reset/sunxi/reset_a31.c
diff --git a/drivers/reset/sunxi/Kconfig b/drivers/reset/sunxi/Kconfig index 40f4f4d0e6..bf1a2f05bf 100644 --- a/drivers/reset/sunxi/Kconfig +++ b/drivers/reset/sunxi/Kconfig @@ -23,6 +23,13 @@ config RESET_SUN5I_A10S This enables common reset driver support for platforms based on Allwinner A10s/A13 SoC.
+config RESET_SUN6I_A31 + bool "Reset driver for Allwinner A31/A31s" + default MACH_SUN6I + help + This enables common reset driver support for platforms based + on Allwinner A31/A31s SoC. + config RESET_SUN8I_H3 bool "Reset driver for Allwinner H3/H5" default MACH_SUNXI_H3_H5 diff --git a/drivers/reset/sunxi/Makefile b/drivers/reset/sunxi/Makefile index 38b8907904..b599e1994b 100644 --- a/drivers/reset/sunxi/Makefile +++ b/drivers/reset/sunxi/Makefile @@ -6,5 +6,6 @@
obj-$(CONFIG_RESET_SUN4I_A10) += reset_a10.o obj-$(CONFIG_RESET_SUN5I_A10S) += reset_a10s.o +obj-$(CONFIG_RESET_SUN6I_A31) += reset_a31.o obj-$(CONFIG_RESET_SUN8I_H3) += reset_h3.o obj-$(CONFIG_RESET_SUN50I_A64) += reset_a64.o diff --git a/drivers/reset/sunxi/reset_a31.c b/drivers/reset/sunxi/reset_a31.c new file mode 100644 index 0000000000..8c7a8a6bb9 --- /dev/null +++ b/drivers/reset/sunxi/reset_a31.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Copyright (C) 2018 Amarula Solutions B.V. + * Author: Jagan Teki jagan@amarulasolutions.com + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <reset-uclass.h> +#include <asm/io.h> +#include <dm/lists.h> +#include <dt-bindings/reset/sun6i-a31-ccu.h> + +struct a31_reset_priv { + void *base; +}; + +static int a31_reset_request(struct reset_ctl *reset_ctl) +{ + debug("%s(#%ld)\n", __func__, reset_ctl->id); + + /* check dt-bindings/reset/sun6i-a31-ccu.h for max id */ + if (reset_ctl->id > 56) + return -EINVAL; + + return 0; +} + +static int a31_reset_free(struct reset_ctl *reset_ctl) +{ + debug("%s(#%ld)\n", __func__, reset_ctl->id); + + return 0; +} + +static int a31_reset_assert(struct reset_ctl *reset_ctl) +{ + struct a31_reset_priv *priv = dev_get_priv(reset_ctl->dev); + + debug("%s(#%ld)\n", __func__, reset_ctl->id); + + switch (reset_ctl->id) { + case RST_USB_PHY0: + case RST_USB_PHY1: + case RST_USB_PHY2: + clrbits_le32(priv->base + 0xcc, BIT(reset_ctl->id)); + return 0; + case RST_AHB1_OTG: + clrbits_le32(priv->base + 0x2c0, BIT(24)); + return 0; + case RST_AHB1_EHCI0: + case RST_AHB1_EHCI1: + clrbits_le32(priv->base + 0x2c0, + BIT(26 + (reset_ctl->id - RST_AHB1_EHCI0))); + return 0; + case RST_AHB1_OHCI0: + case RST_AHB1_OHCI1: + case RST_AHB1_OHCI2: + clrbits_le32(priv->base + 0x2c0, + BIT(29 + (reset_ctl->id - RST_AHB1_OHCI0))); + return 0; + default: + debug("%s (RST#%ld) unhandled\n", __func__, reset_ctl->id); + return -ENODEV; + } +} + +static int a31_reset_deassert(struct reset_ctl *reset_ctl) +{ + struct a31_reset_priv *priv = dev_get_priv(reset_ctl->dev); + + debug("%s(#%ld)\n", __func__, reset_ctl->id); + + switch (reset_ctl->id) { + case RST_USB_PHY0: + case RST_USB_PHY1: + case RST_USB_PHY2: + setbits_le32(priv->base + 0xcc, BIT(reset_ctl->id)); + return 0; + case RST_AHB1_OTG: + setbits_le32(priv->base + 0x2c0, BIT(24)); + return 0; + case RST_AHB1_EHCI0: + case RST_AHB1_EHCI1: + setbits_le32(priv->base + 0x2c0, + BIT(26 + (reset_ctl->id - RST_AHB1_EHCI0))); + return 0; + case RST_AHB1_OHCI0: + case RST_AHB1_OHCI1: + case RST_AHB1_OHCI2: + setbits_le32(priv->base + 0x2c0, + BIT(29 + (reset_ctl->id - RST_AHB1_OHCI0))); + return 0; + default: + debug("%s (RST#%ld) unhandled\n", __func__, reset_ctl->id); + return -ENODEV; + } +} + +struct reset_ops a31_reset_ops = { + .request = a31_reset_request, + .free = a31_reset_free, + .rst_assert = a31_reset_assert, + .rst_deassert = a31_reset_deassert, +}; + +static int a31_reset_probe(struct udevice *dev) +{ + struct a31_reset_priv *priv = dev_get_priv(dev); + + priv->base = dev_read_addr_ptr(dev); + + return 0; +} + +U_BOOT_DRIVER(reset_sun6i_a31) = { + .name = "sun6i_a31_reset", + .id = UCLASS_RESET, + .ops = &a31_reset_ops, + .probe = a31_reset_probe, + .priv_auto_alloc_size = sizeof(struct a31_reset_priv), +};