[U-Boot] [PATCH 06/21] usb: ehci: Add STi ehci support

[Simon Glass]

Hi,

On 17 March 2017 at 10:25,  <patrice.chotard at st.com> wrote:
> From: Patrice Chotard <patrice.chotard at st.com>
>
> Add support for on-chip ehci controller available
> on STMicrolectronics SoCs.
> ehci support will be then available on both type A
> USB 2.0 connectors.
>
> Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
> ---
>  drivers/usb/host/Kconfig    |  9 +++++
>  drivers/usb/host/Makefile   |  1 +
>  drivers/usb/host/ehci-sti.c | 91 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 101 insertions(+)
>  create mode 100644 drivers/usb/host/ehci-sti.c
>
> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> index 5129a57..d66f49e 100644
> --- a/drivers/usb/host/Kconfig
> +++ b/drivers/usb/host/Kconfig
> @@ -120,6 +120,15 @@ config USB_EHCI_MSM
>           This driver supports combination of Chipidea USB controller
>           and Synapsys USB PHY in host mode only.
>
> +config USB_EHCI_STI
> +       bool "Support for STMicroelectronics on-chip EHCI USB controller"
> +       depends on ARCH_STI
> +       select STI_PHY_USB
> +       default y
> +       ---help---
> +         Enables support for the on-chip EHCI controller on
> +         STMicroelectronics SoCs.
> +
>  config USB_EHCI_ZYNQ
>         bool "Support for Xilinx Zynq on-chip EHCI USB controller"
>         depends on ARCH_ZYNQ
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index 58c0cf5..303aa32 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -46,6 +46,7 @@ obj-$(CONFIG_USB_EHCI_MARVELL) += ehci-marvell.o
>  obj-$(CONFIG_USB_EHCI_MSM) += ehci-msm.o
>  obj-$(CONFIG_USB_EHCI_PCI) += ehci-pci.o
>  obj-$(CONFIG_USB_EHCI_SPEAR) += ehci-spear.o
> +obj-$(CONFIG_USB_EHCI_STI) += ehci-sti.o
>  obj-$(CONFIG_USB_EHCI_SUNXI) += ehci-sunxi.o
>  obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
>  obj-$(CONFIG_USB_EHCI_VCT) += ehci-vct.o
> diff --git a/drivers/usb/host/ehci-sti.c b/drivers/usb/host/ehci-sti.c
> new file mode 100644
> index 0000000..89ca66a
> --- /dev/null
> +++ b/drivers/usb/host/ehci-sti.c
> @@ -0,0 +1,91 @@
> +/*
> + * Copyright (c) 2017
> + * Patrice Chotard <patrice.chotard at st.com>
> + *
> + * SPDX-License-Identifier:    GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +#include <dm.h>
> +#include <errno.h>
> +#include "ehci.h"
> +#include <reset-uclass.h>
> +#include <usb.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +struct sti_ehci_priv {
> +       struct ehci_ctrl ctrl;
> +       struct reset_ctl power_ctl;
> +       struct reset_ctl softreset_ctl;
> +};
> +
> +static int sti_ehci_probe(struct udevice *dev)
> +{
> +       struct sti_ehci_priv *priv = dev_get_priv(dev);
> +       struct ehci_hccr *hccr = priv->ctrl.hccr;
> +       struct ehci_hcor *hcor;
> +       struct udevice *dev_phy;
> +       int ret, phy_node;
> +
> +       hccr = (struct ehci_hccr *)dev_get_addr(dev);
> +
> +       if (hccr == (void *)FDT_ADDR_T_NONE)
> +               return -EINVAL;
> +
> +       ret = reset_get_by_name(dev, "power", &priv->power_ctl);

This is OK, but can you instead access it via a phandle in the device's node?

> +       if (ret) {
> +               error("can't get power reset for %s (%d)", dev->name, ret);
> +               return ret;
> +       }
> +
> +       ret = reset_get_by_name(dev, "softreset", &priv->softreset_ctl);
> +       if (ret) {
> +               error("can't get soft reset for %s (%d)", dev->name, ret);
> +               return ret;
> +       }
> +
> +       ret = reset_deassert(&priv->power_ctl);
> +       if (ret < 0) {
> +               error("EHCI power reset deassert failed: %d", ret);
> +               return ret;
> +       }
> +
> +       ret = reset_deassert(&priv->softreset_ctl);
> +       if (ret < 0) {
> +               error("EHCI soft reset deassert failed: %d", ret);
> +               return ret;
> +       }
> +
> +       /* get phy node */
> +       phy_node = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset, "phys");
> +       if (phy_node <= 0) {
> +               error("Not found usb phy device\n");
> +               return -ENODEV;
> +       }
> +
> +       /* probe associated phy */
> +       ret = uclass_get_device_by_of_offset(UCLASS_MISC, phy_node, &dev_phy);

Instead of the above two calls, can you use uclass_get_device_by_phandle()?

> +
> +       hcor = (struct ehci_hcor *)((phys_addr_t)hccr +
> +                       HC_LENGTH(ehci_readl(&(hccr)->cr_capbase)));
> +
> +       return ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST);
> +}
> +
> +static const struct udevice_id sti_usb_ids[] = {
> +       { .compatible = "st,st-ehci-300x" },
> +       { }
> +};
> +
> +U_BOOT_DRIVER(ehci_sti) = {
> +       .name = "ehci_sti",
> +       .id = UCLASS_USB,
> +       .of_match = sti_usb_ids,
> +       .probe = sti_ehci_probe,
> +       .remove = ehci_deregister,
> +       .ops = &ehci_usb_ops,
> +       .priv_auto_alloc_size = sizeof(struct sti_ehci_priv),
> +       .flags  = DM_FLAG_ALLOC_PRIV_DMA,
> +};
> --
> 1.9.1
>

Regards,
Simon