[PATCH 3/3] usb: musb-new: Add glue driver for ST-Ericsson Ux500
Stephan Gerhold
stephan at gerhold.net
Mon Jul 5 18:28:09 CEST 2021
The ST-Ericsson DB8500 SoC contains a MUSB OTG controller which
supports both host and gadget mode. For some reason there is
nothing special about it - add a simple glue driver for Ux500
that literally just sets up MUSB together with a generic PHY.
There are no SoC-specific registers etc needed to make USB work.
The new Ux500 glue driver is only tested to work with DM_USB
and DM_USB_GADGET. Both host and gadget mode work fine on
the u8500 "stemmy" board that is already present in U-Boot.
Cc: Linus Walleij <linus.walleij at linaro.org>
Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
---
This patch could be applied separately from the first two if
needed. There is a functional runtime dependency but not
a compile time dependency with the PMIC changes in the first
two patches.
---
drivers/usb/musb-new/Kconfig | 11 +-
drivers/usb/musb-new/Makefile | 1 +
drivers/usb/musb-new/musb_core.c | 2 +-
drivers/usb/musb-new/ux500.c | 179 +++++++++++++++++++++++++++++++
4 files changed, 191 insertions(+), 2 deletions(-)
create mode 100644 drivers/usb/musb-new/ux500.c
diff --git a/drivers/usb/musb-new/Kconfig b/drivers/usb/musb-new/Kconfig
index fd6f4109b0..81ceea9740 100644
--- a/drivers/usb/musb-new/Kconfig
+++ b/drivers/usb/musb-new/Kconfig
@@ -72,6 +72,15 @@ config USB_MUSB_SUNXI
Say y here to enable support for the sunxi OTG / DRC USB controller
used on almost all sunxi boards.
+config USB_MUSB_UX500
+ bool "Enable ST-Ericsson Ux500 USB controller"
+ depends on DM_USB && DM_USB_GADGET && ARCH_U8500
+ default y
+ help
+ Say y to enable support for the MUSB OTG USB controller used in
+ ST-Ericsson Ux500. The driver supports either gadget or host mode
+ based on the selection of CONFIG_USB_MUSB_HOST.
+
config USB_MUSB_DISABLE_BULK_COMBINE_SPLIT
bool "Disable MUSB bulk split/combine"
default y
@@ -85,7 +94,7 @@ endif
config USB_MUSB_PIO_ONLY
bool "Disable DMA (always use PIO)"
- default y if USB_MUSB_AM35X || USB_MUSB_PIC32 || USB_MUSB_OMAP2PLUS || USB_MUSB_DSPS || USB_MUSB_SUNXI || USB_MUSB_MT85XX
+ default y if USB_MUSB_AM35X || USB_MUSB_PIC32 || USB_MUSB_OMAP2PLUS || USB_MUSB_DSPS || USB_MUSB_SUNXI || USB_MUSB_MT85XX || USB_MUSB_UX500
help
All data is copied between memory and FIFO by the CPU.
DMA controllers are ignored.
diff --git a/drivers/usb/musb-new/Makefile b/drivers/usb/musb-new/Makefile
index 6355eb12dd..396ff02654 100644
--- a/drivers/usb/musb-new/Makefile
+++ b/drivers/usb/musb-new/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_USB_MUSB_OMAP2PLUS) += omap2430.o
obj-$(CONFIG_USB_MUSB_PIC32) += pic32.o
obj-$(CONFIG_USB_MUSB_SUNXI) += sunxi.o
obj-$(CONFIG_USB_MUSB_TI) += ti-musb.o
+obj-$(CONFIG_USB_MUSB_UX500) += ux500.o
ccflags-y := $(call cc-option,-Wno-unused-variable) \
$(call cc-option,-Wno-unused-but-set-variable) \
diff --git a/drivers/usb/musb-new/musb_core.c b/drivers/usb/musb-new/musb_core.c
index 22811a5efb..18d9bc805f 100644
--- a/drivers/usb/musb-new/musb_core.c
+++ b/drivers/usb/musb-new/musb_core.c
@@ -1526,7 +1526,7 @@ static int __devinit musb_core_init(u16 musb_type, struct musb *musb)
/*-------------------------------------------------------------------------*/
#if defined(CONFIG_SOC_OMAP2430) || defined(CONFIG_SOC_OMAP3430) || \
- defined(CONFIG_ARCH_OMAP4)
+ defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_ARCH_U8500)
static irqreturn_t generic_interrupt(int irq, void *__hci)
{
diff --git a/drivers/usb/musb-new/ux500.c b/drivers/usb/musb-new/ux500.c
new file mode 100644
index 0000000000..57c7d5630d
--- /dev/null
+++ b/drivers/usb/musb-new/ux500.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (C) 2019 Stephan Gerhold */
+
+#include <common.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <dm/device_compat.h>
+#include "musb_uboot.h"
+
+static struct musb_hdrc_config ux500_musb_hdrc_config = {
+ .multipoint = true,
+ .dyn_fifo = true,
+ .num_eps = 16,
+ .ram_bits = 16,
+};
+
+struct ux500_glue {
+ struct musb_host_data mdata;
+ struct device dev;
+ struct phy phy;
+ bool enabled;
+};
+#define to_ux500_glue(d) container_of(d, struct ux500_glue, dev)
+
+static int ux500_musb_enable(struct musb *musb)
+{
+ struct ux500_glue *glue = to_ux500_glue(musb->controller);
+ int ret;
+
+ if (glue->enabled)
+ return 0;
+
+ ret = generic_phy_power_on(&glue->phy);
+ if (ret) {
+ printf("%s: failed to power on USB PHY\n", __func__);
+ return ret;
+ }
+
+ glue->enabled = true;
+ return 0;
+}
+
+static void ux500_musb_disable(struct musb *musb)
+{
+ struct ux500_glue *glue = to_ux500_glue(musb->controller);
+ int ret;
+
+ if (!glue->enabled)
+ return;
+
+ ret = generic_phy_power_off(&glue->phy);
+ if (ret) {
+ printf("%s: failed to power off USB PHY\n", __func__);
+ return;
+ }
+
+ glue->enabled = false;
+}
+
+static int ux500_musb_init(struct musb *musb)
+{
+ struct ux500_glue *glue = to_ux500_glue(musb->controller);
+ int ret;
+
+ ret = generic_phy_init(&glue->phy);
+ if (ret) {
+ printf("%s: failed to init USB PHY\n", __func__);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ux500_musb_exit(struct musb *musb)
+{
+ struct ux500_glue *glue = to_ux500_glue(musb->controller);
+ int ret;
+
+ ret = generic_phy_exit(&glue->phy);
+ if (ret) {
+ printf("%s: failed to exit USB PHY\n", __func__);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct musb_platform_ops ux500_musb_ops = {
+ .init = ux500_musb_init,
+ .exit = ux500_musb_exit,
+ .enable = ux500_musb_enable,
+ .disable = ux500_musb_disable,
+};
+
+int dm_usb_gadget_handle_interrupts(struct udevice *dev)
+{
+ struct ux500_glue *glue = dev_get_priv(dev);
+
+ glue->mdata.host->isr(0, glue->mdata.host);
+ return 0;
+}
+
+static int ux500_musb_probe(struct udevice *dev)
+{
+#ifdef CONFIG_USB_MUSB_HOST
+ struct usb_bus_priv *priv = dev_get_uclass_priv(dev);
+#endif
+ struct ux500_glue *glue = dev_get_priv(dev);
+ struct musb_host_data *host = &glue->mdata;
+ struct musb_hdrc_platform_data pdata;
+ void *base = dev_read_addr_ptr(dev);
+ int ret;
+
+ if (!base)
+ return -EINVAL;
+
+ ret = generic_phy_get_by_name(dev, "usb", &glue->phy);
+ if (ret) {
+ dev_err(dev, "failed to get USB PHY: %d\n", ret);
+ return ret;
+ }
+
+ memset(&pdata, 0, sizeof(pdata));
+ pdata.platform_ops = &ux500_musb_ops;
+ pdata.config = &ux500_musb_hdrc_config;
+
+#ifdef CONFIG_USB_MUSB_HOST
+ priv->desc_before_addr = true;
+ pdata.mode = MUSB_HOST;
+
+ host->host = musb_init_controller(&pdata, &glue->dev, base);
+ if (!host->host)
+ return -EIO;
+
+ return musb_lowlevel_init(host);
+#else
+ pdata.mode = MUSB_PERIPHERAL;
+ host->host = musb_init_controller(&pdata, &glue->dev, base);
+ if (!host->host)
+ return -EIO;
+
+ return usb_add_gadget_udc(&glue->dev, &host->host->g);
+#endif
+}
+
+static int ux500_musb_remove(struct udevice *dev)
+{
+ struct ux500_glue *glue = dev_get_priv(dev);
+ struct musb_host_data *host = &glue->mdata;
+
+ usb_del_gadget_udc(&host->host->g);
+ musb_stop(host->host);
+ free(host->host);
+ host->host = NULL;
+
+ return 0;
+}
+
+static const struct udevice_id ux500_musb_ids[] = {
+ { .compatible = "stericsson,db8500-musb" },
+ { }
+};
+
+U_BOOT_DRIVER(ux500_musb) = {
+ .name = "ux500-musb",
+#ifdef CONFIG_USB_MUSB_HOST
+ .id = UCLASS_USB,
+#else
+ .id = UCLASS_USB_GADGET_GENERIC,
+#endif
+ .of_match = ux500_musb_ids,
+ .probe = ux500_musb_probe,
+ .remove = ux500_musb_remove,
+#ifdef CONFIG_USB_MUSB_HOST
+ .ops = &musb_usb_ops,
+#endif
+ .plat_auto = sizeof(struct usb_plat),
+ .priv_auto = sizeof(struct ux500_glue),
+};
--
2.32.0
More information about the U-Boot
mailing list