[U-Boot] [PATCH v2 3/3] mach-meson: g12a: add DWC2 peripheral mode support

[Neil Armstrong]

Hi Lukasz,

On 19/04/2019 08:17, Lukasz Majewski wrote:
> Hi Neil,
> 
>> Adds support for Amlogic G12A USB Device mode.
>>
>> The DWC2 Controller behind the Glue can be connected to an OTG
>> capable PHY. The Glue setups the PHY mode.
>>
>> This patch implements Device mode support by adding a
>> board_usb_init/cleanup setting up the DWC2 controller and switch the
>> OTG capable port to Device before starting the DWC2 controller in
>> Device mode.
>>
>> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
> 
> I wanted to apply this series, but it turned out that it depends on:
> [U-Boot] [PATCH v2 0/6] ARM: meson: Add support for G12A based U200
> board
> 
> Let's wait till the above one is pulled to master.

I just sent a PR to Tom, will ping you when pulled to master.

Thanks,
Neil

> 
>> ---
>>  arch/arm/include/asm/arch-meson/usb.h |  12 +++
>>  arch/arm/mach-meson/board-g12a.c      | 126
>> ++++++++++++++++++++++++++ 2 files changed, 138 insertions(+)
>>  create mode 100644 arch/arm/include/asm/arch-meson/usb.h
>>
>> diff --git a/arch/arm/include/asm/arch-meson/usb.h
>> b/arch/arm/include/asm/arch-meson/usb.h new file mode 100644
>> index 0000000000..b794b5ce77
>> --- /dev/null
>> +++ b/arch/arm/include/asm/arch-meson/usb.h
>> @@ -0,0 +1,12 @@
>> +/* SPDX-License-Identifier: GPL-2.0+ */
>> +/*
>> + * Copyright (C) 2019 BayLibre, SAS
>> + * Author: Neil Armstrong <narmstrong at baylibre.com>
>> + */
>> +
>> +#ifndef __MESON_USB_H__
>> +#define __MESON_USB_H__
>> +
>> +int dwc3_meson_g12a_force_mode(struct udevice *dev, enum usb_dr_mode
>> mode); +
>> +#endif /* __MESON_USB_H__ */
>> diff --git a/arch/arm/mach-meson/board-g12a.c
>> b/arch/arm/mach-meson/board-g12a.c index fc3764b960..1652970fbd 100644
>> --- a/arch/arm/mach-meson/board-g12a.c
>> +++ b/arch/arm/mach-meson/board-g12a.c
>> @@ -12,7 +12,12 @@
>>  #include <asm/io.h>
>>  #include <asm/armv8/mmu.h>
>>  #include <linux/sizes.h>
>> +#include <usb.h>
>> +#include <linux/usb/otg.h>
>> +#include <asm/arch/usb.h>
>> +#include <usb/dwc2_udc.h>
>>  #include <phy.h>
>> +#include <clk.h>
>>  
>>  DECLARE_GLOBAL_DATA_PTR;
>>  
>> @@ -148,3 +153,124 @@ void meson_eth_init(phy_interface_t mode,
>> unsigned int flags) /* Enable power gate */
>>  	clrbits_le32(G12A_MEM_PD_REG_0, G12A_MEM_PD_REG_0_ETH_MASK);
>>  }
>> +
>> +#if CONFIG_IS_ENABLED(USB_DWC3_MESON_G12A) && \
>> +	CONFIG_IS_ENABLED(USB_GADGET_DWC2_OTG)
>> +static struct dwc2_plat_otg_data meson_g12a_dwc2_data;
>> +
>> +int board_usb_init(int index, enum usb_init_type init)
>> +{
>> +	struct fdtdec_phandle_args args;
>> +	const void *blob = gd->fdt_blob;
>> +	int node, dwc2_node;
>> +	struct udevice *dev, *clk_dev;
>> +	struct clk clk;
>> +	int ret;
>> +
>> +	/* find the usb glue node */
>> +	node = fdt_node_offset_by_compatible(blob, -1,
>> +
>> "amlogic,meson-g12a-usb-ctrl");
>> +	if (node < 0) {
>> +		debug("Not found usb-control node\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	if (!fdtdec_get_is_enabled(blob, node)) {
>> +		debug("usb is disabled in the device tree\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	ret = uclass_get_device_by_of_offset(UCLASS_SIMPLE_BUS,
>> node, &dev);
>> +	if (ret) {
>> +		debug("Not found usb-control device\n");
>> +		return ret;
>> +	}
>> +
>> +	/* find the dwc2 node */
>> +	dwc2_node = fdt_node_offset_by_compatible(blob, node,
>> +
>> "amlogic,meson-g12a-usb");
>> +	if (dwc2_node < 0) {
>> +		debug("Not found dwc2 node\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	if (!fdtdec_get_is_enabled(blob, dwc2_node)) {
>> +		debug("dwc2 is disabled in the device tree\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	meson_g12a_dwc2_data.regs_otg = fdtdec_get_addr(blob,
>> dwc2_node, "reg");
>> +	if (meson_g12a_dwc2_data.regs_otg == FDT_ADDR_T_NONE) {
>> +		debug("usbotg: can't get base address\n");
>> +		return -ENODATA;
>> +	}
>> +
>> +	/* Enable clock */
>> +	ret = fdtdec_parse_phandle_with_args(blob, dwc2_node,
>> "clocks",
>> +					     "#clock-cells", 0, 0,
>> &args);
>> +	if (ret) {
>> +		debug("usbotg has no clocks defined in the device
>> tree\n");
>> +		return ret;
>> +	}
>> +
>> +	ret = uclass_get_device_by_of_offset(UCLASS_CLK, args.node,
>> &clk_dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	if (args.args_count != 1) {
>> +		debug("Can't find clock ID in the device tree\n");
>> +		return -ENODATA;
>> +	}
>> +
>> +	clk.dev = clk_dev;
>> +	clk.id = args.args[0];
>> +
>> +	ret = clk_enable(&clk);
>> +	if (ret) {
>> +		debug("Failed to enable usbotg clock\n");
>> +		return ret;
>> +	}
>> +
>> +	meson_g12a_dwc2_data.rx_fifo_sz = fdtdec_get_int(blob,
>> dwc2_node,
>> +
>> "g-rx-fifo-size", 0);
>> +	meson_g12a_dwc2_data.np_tx_fifo_sz = fdtdec_get_int(blob,
>> dwc2_node,
>> +							"g-np-tx-fifo-size",
>> 0);
>> +	meson_g12a_dwc2_data.tx_fifo_sz = fdtdec_get_int(blob,
>> dwc2_node,
>> +
>> "g-tx-fifo-size", 0); +
>> +	/* Switch to peripheral mode */
>> +	ret = dwc3_meson_g12a_force_mode(dev,
>> USB_DR_MODE_PERIPHERAL);
>> +	if (ret)
>> +		return ret;
>> +
>> +	return dwc2_udc_probe(&meson_g12a_dwc2_data);
>> +}
>> +
>> +int board_usb_cleanup(int index, enum usb_init_type init)
>> +{
>> +	const void *blob = gd->fdt_blob;
>> +	struct udevice *dev;
>> +	int node;
>> +	int ret;
>> +
>> +	/* find the usb glue node */
>> +	node = fdt_node_offset_by_compatible(blob, -1,
>> +
>> "amlogic,meson-g12a-usb-ctrl");
>> +	if (node < 0)
>> +		return -ENODEV;
>> +
>> +	if (!fdtdec_get_is_enabled(blob, node))
>> +		return -ENODEV;
>> +
>> +	ret = uclass_get_device_by_of_offset(UCLASS_SIMPLE_BUS,
>> node, &dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* Switch to OTG mode */
>> +	ret = dwc3_meson_g12a_force_mode(dev, USB_DR_MODE_HOST);
>> +	if (ret)
>> +		return ret;
>> +
>> +	return 0;
>> +}
>> +#endif
> 
> 
> 
> 
> Best regards,
> 
> Lukasz Majewski
> 
> --
> 
> DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma at denx.de
> 


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