[PATCH] usb: max3420: add the gadget driver
jassisinghbrar at gmail.com
jassisinghbrar at gmail.com
Mon Mar 30 02:49:13 CEST 2020
From: Jassi Brar <jaswinder.singh at linaro.org>
MAX3420 implements FullSpeed USB Device over SPI.
Another version MAX3421, also implements USB Host mode.
This driver should be good for the device mode of max3421 as well.
Signed-off-by: Jassi Brar <jaswinder.singh at linaro.org>
---
drivers/usb/gadget/Kconfig | 6 +
drivers/usb/gadget/Makefile | 1 +
drivers/usb/gadget/gadget_chips.h | 8 +
drivers/usb/gadget/max3420_udc.c | 876 ++++++++++++++++++++++++++++++
4 files changed, 891 insertions(+)
create mode 100644 drivers/usb/gadget/max3420_udc.c
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 58ca82d4de..47b9c83e6e 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -105,6 +105,12 @@ config CI_UDC
Say Y here to enable device controller functionality of the
ChipIdea driver.
+config USB_GADGET_MAX3420
+ bool "MAX3420 USB Over SPI"
+ depends on DM_SPI
+ help
+ MAX3420, from MAXIM, implements USB-over-SPI Full-Speed device controller.
+
config USB_GADGET_VBUS_DRAW
int "Maximum VBUS Power usage (2-500 mA)"
range 2 500
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 70f3bf43e7..f560068b41 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_USB_GADGET_BCM_UDC_OTG_PHY) += bcm_udc_otg_phy.o
obj-$(CONFIG_USB_GADGET_DWC2_OTG) += dwc2_udc_otg.o
obj-$(CONFIG_USB_GADGET_DWC2_OTG_PHY) += dwc2_udc_otg_phy.o
obj-$(CONFIG_USB_GADGET_FOTG210) += fotg210.o
+obj-$(CONFIG_USB_GADGET_MAX3420) += max3420_udc.o
obj-$(CONFIG_CI_UDC) += ci_udc.o
ifndef CONFIG_SPL_BUILD
obj-$(CONFIG_USB_GADGET_DOWNLOAD) += g_dnl.o
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index 91b0285244..587204cfb7 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -155,6 +155,12 @@
#define gadget_is_cdns3(g) 0
#endif
+#ifdef CONFIG_USB_GADGET_MAX3420
+#define gadget_is_max3420(g) (!strcmp("max3420-udc", (g)->name))
+#else
+#define gadget_is_max3420(g) 0
+#endif
+
/**
* usb_gadget_controller_number - support bcdDevice id convention
* @gadget: the controller being driven
@@ -216,5 +222,7 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
return 0x23;
else if (gadget_is_cdns3(gadget))
return 0x24;
+ else if (gadget_is_max3420(gadget))
+ return 0x25;
return -ENOENT;
}
diff --git a/drivers/usb/gadget/max3420_udc.c b/drivers/usb/gadget/max3420_udc.c
new file mode 100644
index 0000000000..f1ccc28017
--- /dev/null
+++ b/drivers/usb/gadget/max3420_udc.c
@@ -0,0 +1,875 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <common.h>
+#include <linux/errno.h>
+#include <asm/gpio.h>
+#include <linux/list.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <malloc.h>
+#include <spi.h>
+#include <dm.h>
+#include <g_dnl.h>
+
+#define MAX3420_MAX_EPS 4
+#define EP_MAX_PACKET 64 /* Same for all Endpoints */
+#define EPNAME_SIZE 16 /* Buffer size for endpoint name */
+
+#define ACKSTAT BIT(0)
+
+#define MAX3420_SPI_DIR_RD 0 /* read register from MAX3420 */
+#define MAX3420_SPI_DIR_WR 1 /* write register to MAX3420 */
+
+/* SPI commands: */
+#define MAX3420_SPI_DIR_SHIFT 1
+#define MAX3420_SPI_REG_SHIFT 3
+
+#define MAX3420_REG_EP0FIFO 0
+#define MAX3420_REG_EP1FIFO 1
+#define MAX3420_REG_EP2FIFO 2
+#define MAX3420_REG_EP3FIFO 3
+#define MAX3420_REG_SUDFIFO 4
+#define MAX3420_REG_EP0BC 5
+#define MAX3420_REG_EP1BC 6
+#define MAX3420_REG_EP2BC 7
+#define MAX3420_REG_EP3BC 8
+
+#define MAX3420_REG_EPSTALLS 9
+ #define bACKSTAT BIT(6)
+ #define bSTLSTAT BIT(5)
+ #define bSTLEP3IN BIT(4)
+ #define bSTLEP2IN BIT(3)
+ #define bSTLEP1OUT BIT(2)
+ #define bSTLEP0OUT BIT(1)
+ #define bSTLEP0IN BIT(0)
+
+#define MAX3420_REG_CLRTOGS 10
+ #define bEP3DISAB BIT(7)
+ #define bEP2DISAB BIT(6)
+ #define bEP1DISAB BIT(5)
+ #define bCTGEP3IN BIT(4)
+ #define bCTGEP2IN BIT(3)
+ #define bCTGEP1OUT BIT(2)
+
+#define MAX3420_REG_EPIRQ 11
+#define MAX3420_REG_EPIEN 12
+ #define bSUDAVIRQ BIT(5)
+ #define bIN3BAVIRQ BIT(4)
+ #define bIN2BAVIRQ BIT(3)
+ #define bOUT1DAVIRQ BIT(2)
+ #define bOUT0DAVIRQ BIT(1)
+ #define bIN0BAVIRQ BIT(0)
+
+#define MAX3420_REG_USBIRQ 13
+#define MAX3420_REG_USBIEN 14
+ #define bOSCOKIRQ BIT(0)
+ #define bRWUDNIRQ BIT(1)
+ #define bBUSACTIRQ BIT(2)
+ #define bURESIRQ BIT(3)
+ #define bSUSPIRQ BIT(4)
+ #define bNOVBUSIRQ BIT(5)
+ #define bVBUSIRQ BIT(6)
+ #define bURESDNIRQ BIT(7)
+
+#define MAX3420_REG_USBCTL 15
+ #define bHOSCSTEN BIT(7)
+ #define bVBGATE BIT(6)
+ #define bCHIPRES BIT(5)
+ #define bPWRDOWN BIT(4)
+ #define bCONNECT BIT(3)
+ #define bSIGRWU BIT(2)
+
+#define MAX3420_REG_CPUCTL 16
+ #define bIE BIT(0)
+
+#define MAX3420_REG_PINCTL 17
+ #define bEP3INAK BIT(7)
+ #define bEP2INAK BIT(6)
+ #define bEP0INAK BIT(5)
+ #define bFDUPSPI BIT(4)
+ #define bINTLEVEL BIT(3)
+ #define bPOSINT BIT(2)
+ #define bGPXB BIT(1)
+ #define bGPXA BIT(0)
+
+#define MAX3420_REG_REVISION 18
+
+#define MAX3420_REG_FNADDR 19
+ #define FNADDR_MASK 0x7f
+
+#define MAX3420_REG_IOPINS 20
+#define MAX3420_REG_IOPINS2 21
+#define MAX3420_REG_GPINIRQ 22
+#define MAX3420_REG_GPINIEN 23
+#define MAX3420_REG_GPINPOL 24
+#define MAX3420_REG_HIRQ 25
+#define MAX3420_REG_HIEN 26
+#define MAX3420_REG_MODE 27
+#define MAX3420_REG_PERADDR 28
+#define MAX3420_REG_HCTL 29
+#define MAX3420_REG_HXFR 30
+#define MAX3420_REG_HRSL 31
+
+#define field(val, bit) ((val) << (bit))
+
+#define msleep(a) udelay((a) * 1000)
+
+struct max3420_req {
+ struct usb_request usb_req;
+ struct list_head queue;
+ struct max3420_ep *ep;
+};
+
+struct max3420_ep {
+ struct max3420_udc *udc;
+ struct list_head queue;
+ char name[EPNAME_SIZE];
+ unsigned int maxpacket;
+ struct usb_ep ep_usb;
+ int halted;
+ int id;
+};
+
+struct max3420_udc {
+ struct max3420_ep ep[MAX3420_MAX_EPS];
+ struct usb_gadget_driver *driver;
+ bool vbus_active, softconnect;
+ struct usb_ctrlrequest setup;
+ struct max3420_req ep0req;
+ struct usb_gadget gadget;
+ struct spi_slave *slave;
+ struct udevice *dev;
+ u8 ep0buf[64];
+ int remote_wkp;
+ bool suspended;
+};
+
+#define to_max3420_req(r) container_of((r), struct max3420_req, usb_req)
+#define to_max3420_ep(e) container_of((e), struct max3420_ep, ep_usb)
+#define to_udc(g) container_of((g), struct max3420_udc, gadget)
+
+static void spi_ack_ctrl(struct max3420_udc *udc)
+{
+ struct spi_slave *slave = udc->slave;
+ u8 txdata[1];
+
+ txdata[0] = ACKSTAT;
+ spi_xfer(slave, 1 * 8, txdata, NULL, SPI_XFER_ONCE);
+}
+
+static u8 spi_rd8_ack(struct max3420_udc *udc, u8 reg, int actstat)
+{
+ struct spi_slave *slave = udc->slave;
+ u8 txdata[2], rxdata[2];
+
+ txdata[0] = field(reg, MAX3420_SPI_REG_SHIFT) |
+ field(MAX3420_SPI_DIR_RD, MAX3420_SPI_DIR_SHIFT) |
+ (actstat ? ACKSTAT : 0);
+
+ rxdata[0] = 0;
+ rxdata[1] = 0;
+ spi_xfer(slave, 2 * 8, txdata, rxdata, SPI_XFER_ONCE);
+
+ return rxdata[1];
+}
+
+static u8 spi_rd8(struct max3420_udc *udc, u8 reg)
+{
+ return spi_rd8_ack(udc, reg, 0);
+}
+
+static void spi_wr8_ack(struct max3420_udc *udc, u8 reg, u8 val, int actstat)
+{
+ struct spi_slave *slave = udc->slave;
+ u8 txdata[2];
+
+ txdata[0] = field(reg, MAX3420_SPI_REG_SHIFT) |
+ field(MAX3420_SPI_DIR_WR, MAX3420_SPI_DIR_SHIFT) |
+ (actstat ? ACKSTAT : 0);
+ txdata[1] = val;
+
+ spi_xfer(slave, 2 * 8, txdata, NULL, SPI_XFER_ONCE);
+}
+
+static void spi_wr8(struct max3420_udc *udc, u8 reg, u8 val)
+{
+ spi_wr8_ack(udc, reg, val, 0);
+}
+
+static void spi_rd_buf(struct max3420_udc *udc, u8 reg, void *buf, u8 len)
+{
+ struct spi_slave *slave = udc->slave;
+ u8 txdata[1];
+
+ txdata[0] = (field(reg, MAX3420_SPI_REG_SHIFT) |
+ field(MAX3420_SPI_DIR_RD, MAX3420_SPI_DIR_SHIFT));
+
+ spi_xfer(slave, 1 * 8, txdata, NULL, SPI_XFER_BEGIN);
+ spi_xfer(slave, len * 8, NULL, buf, SPI_XFER_END);
+}
+
+static void spi_wr_buf(struct max3420_udc *udc, u8 reg, void *buf, u8 len)
+{
+ struct spi_slave *slave = udc->slave;
+ u8 txdata[1];
+
+ txdata[0] = (field(reg, MAX3420_SPI_REG_SHIFT) |
+ field(MAX3420_SPI_DIR_WR, MAX3420_SPI_DIR_SHIFT));
+
+ spi_xfer(slave, 1 * 8, txdata, NULL, SPI_XFER_BEGIN);
+ spi_xfer(slave, len * 8, buf, NULL, SPI_XFER_END);
+}
+
+/* 0 if not-connected */
+int g_dnl_board_usb_cable_connected(void)
+{
+ return 1;
+}
+
+static void spi_max3420_enable(struct max3420_ep *ep, int enable)
+{
+ struct max3420_udc *udc = ep->udc;
+ u8 epdis, epien;
+
+ if (ep->id == 0)
+ return;
+
+ epien = spi_rd8(udc, MAX3420_REG_EPIEN);
+ epdis = spi_rd8(udc, MAX3420_REG_CLRTOGS);
+
+ if (enable) {
+ epdis &= ~BIT(ep->id + 4);
+ epien |= BIT(ep->id + 1);
+ } else {
+ epdis |= BIT(ep->id + 4);
+ epien &= ~BIT(ep->id + 1);
+ }
+
+ spi_wr8(udc, MAX3420_REG_CLRTOGS, epdis);
+ spi_wr8(udc, MAX3420_REG_EPIEN, epien);
+}
+
+static int
+max3420_ep_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct max3420_ep *ep = to_max3420_ep(_ep);
+
+ _ep->desc = desc;
+ _ep->maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
+
+ spi_max3420_enable(ep, 1);
+
+ return 0;
+}
+
+static void max3420_req_done(struct max3420_req *req, int status)
+{
+ struct max3420_ep *ep = req->ep;
+
+ if (req->usb_req.status == -EINPROGRESS)
+ req->usb_req.status = status;
+ else
+ status = req->usb_req.status;
+
+ if (status && status != -ESHUTDOWN)
+ dev_err(ep->udc->dev, "%s done %p, status %d\n",
+ ep->ep_usb.name, req, status);
+
+ if (req->usb_req.complete)
+ req->usb_req.complete(&ep->ep_usb, &req->usb_req);
+}
+
+static void max3420_ep_nuke(struct max3420_ep *ep, int status)
+{
+ struct max3420_req *req, *r;
+
+ list_for_each_entry_safe(req, r, &ep->queue, queue) {
+ list_del_init(&req->queue);
+ max3420_req_done(req, status);
+ }
+}
+
+static int max3420_ep_disable(struct usb_ep *_ep)
+{
+ struct max3420_ep *ep = to_max3420_ep(_ep);
+
+ _ep->desc = NULL;
+ max3420_ep_nuke(ep, -ESHUTDOWN);
+ spi_max3420_enable(ep, 0);
+
+ return 0;
+}
+
+static struct usb_request *
+max3420_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
+{
+ struct max3420_ep *ep = to_max3420_ep(_ep);
+ struct max3420_req *req = kzalloc(sizeof(*req), gfp_flags);
+
+ if (!req)
+ return NULL;
+
+ req->ep = ep;
+ INIT_LIST_HEAD(&req->queue);
+
+ return &req->usb_req;
+}
+
+static void
+max3420_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+ kfree(to_max3420_req(_req));
+}
+
+static int
+max3420_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
+{
+ struct max3420_req *req = to_max3420_req(_req);
+ struct max3420_ep *ep = to_max3420_ep(_ep);
+
+ _req->status = -EINPROGRESS;
+ _req->actual = 0;
+ list_add_tail(&req->queue, &ep->queue);
+
+ return 0;
+}
+
+static int max3420_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct max3420_req *req = to_max3420_req(_req);
+
+ list_del_init(&req->queue);
+ max3420_req_done(req, -ECONNRESET);
+
+ return 0;
+}
+
+static int max3420_ep_set_halt(struct usb_ep *_ep, int halt)
+{
+ struct max3420_ep *ep = to_max3420_ep(_ep);
+ struct max3420_udc *udc = ep->udc;
+ u8 epstalls;
+
+ if (ep->id == 0) /* can't stall EP0 */
+ return 0;
+
+ epstalls = spi_rd8(udc, MAX3420_REG_EPSTALLS);
+ if (halt) {
+ ep->halted = 1;
+ epstalls |= BIT(ep->id + 1);
+ } else {
+ u8 clrtogs;
+
+ ep->halted = 0;
+ epstalls &= ~BIT(ep->id + 1);
+ clrtogs = spi_rd8(udc, MAX3420_REG_CLRTOGS);
+ clrtogs |= BIT(ep->id + 1);
+ spi_wr8(udc, MAX3420_REG_CLRTOGS, clrtogs);
+ }
+ spi_wr8(udc, MAX3420_REG_EPSTALLS, epstalls | bACKSTAT);
+
+ return 0;
+}
+
+static const struct usb_ep_ops max3420_ep_ops = {
+ .enable = max3420_ep_enable,
+ .disable = max3420_ep_disable,
+ .alloc_request = max3420_ep_alloc_request,
+ .free_request = max3420_ep_free_request,
+ .queue = max3420_ep_queue,
+ .dequeue = max3420_ep_dequeue,
+ .set_halt = max3420_ep_set_halt,
+};
+
+static void __max3420_stop(struct max3420_udc *udc)
+{
+ u8 val;
+
+ /* Disable IRQ to CPU */
+ spi_wr8(udc, MAX3420_REG_CPUCTL, 0);
+
+ val = spi_rd8(udc, MAX3420_REG_USBCTL);
+ val |= bPWRDOWN;
+ val |= bHOSCSTEN;
+ spi_wr8(udc, MAX3420_REG_USBCTL, val);
+}
+
+static void __max3420_start(struct max3420_udc *udc)
+{
+ u8 val;
+
+ /* configure SPI */
+ spi_wr8(udc, MAX3420_REG_PINCTL, bFDUPSPI);
+
+ /* Chip Reset */
+ spi_wr8(udc, MAX3420_REG_USBCTL, bCHIPRES);
+ msleep(5);
+ spi_wr8(udc, MAX3420_REG_USBCTL, 0);
+
+ /* Poll for OSC to stabilize */
+ while (1) {
+ val = spi_rd8(udc, MAX3420_REG_USBIRQ);
+ if (val & bOSCOKIRQ)
+ break;
+ cond_resched();
+ }
+
+ /* Enable PULL-UP only when Vbus detected */
+ val = spi_rd8(udc, MAX3420_REG_USBCTL);
+ val |= bVBGATE | bCONNECT;
+ spi_wr8(udc, MAX3420_REG_USBCTL, val);
+
+ val = bURESDNIRQ | bURESIRQ;
+ spi_wr8(udc, MAX3420_REG_USBIEN, val);
+
+ /* Enable only EP0 interrupts */
+ val = bIN0BAVIRQ | bOUT0DAVIRQ | bSUDAVIRQ;
+ spi_wr8(udc, MAX3420_REG_EPIEN, val);
+
+ /* Enable IRQ to CPU */
+ spi_wr8(udc, MAX3420_REG_CPUCTL, bIE);
+}
+
+static int max3420_udc_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct max3420_udc *udc = to_udc(gadget);
+ unsigned long flags;
+
+ udc->driver = driver;
+ udc->remote_wkp = 0;
+ udc->softconnect = true;
+
+ //if (udc->vbus_active)
+ __max3420_start(udc);
+
+ return 0;
+}
+
+static int max3420_udc_stop(struct usb_gadget *gadget)
+{
+ struct max3420_udc *udc = to_udc(gadget);
+
+ udc->driver = NULL;
+ udc->softconnect = false;
+
+ __max3420_stop(udc);
+
+ return 0;
+}
+
+static int max3420_wakeup(struct usb_gadget *gadget)
+{
+ struct max3420_udc *udc = to_udc(gadget);
+ u8 usbctl;
+
+ /* Only if wakeup allowed by host */
+ if (!udc->remote_wkp || !udc->suspended)
+ return 0;
+
+ /* Set Remote-WkUp Signal*/
+ usbctl = spi_rd8(udc, MAX3420_REG_USBCTL);
+ usbctl |= bSIGRWU;
+ spi_wr8(udc, MAX3420_REG_USBCTL, usbctl);
+
+ msleep(5);
+
+ /* Clear Remote-WkUp Signal*/
+ usbctl = spi_rd8(udc, MAX3420_REG_USBCTL);
+ usbctl &= ~bSIGRWU;
+ spi_wr8(udc, MAX3420_REG_USBCTL, usbctl);
+
+ udc->suspended = false;
+
+ return 0;
+}
+
+static const struct usb_gadget_ops max3420_udc_ops = {
+ .udc_start = max3420_udc_start,
+ .udc_stop = max3420_udc_stop,
+ .wakeup = max3420_wakeup,
+};
+
+static struct usb_endpoint_descriptor ep0_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+ .wMaxPacketSize = cpu_to_le16(EP_MAX_PACKET),
+};
+
+static void max3420_getstatus(struct max3420_udc *udc)
+{
+ struct max3420_ep *ep;
+ u16 status = 0;
+
+ switch (udc->setup.bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ /* Get device status */
+ status = 0 << USB_DEVICE_SELF_POWERED;
+ status |= (udc->remote_wkp << USB_DEVICE_REMOTE_WAKEUP);
+ break;
+ case USB_RECIP_INTERFACE:
+ if (udc->driver->setup(&udc->gadget, &udc->setup) < 0)
+ goto stall;
+ break;
+ case USB_RECIP_ENDPOINT:
+ ep = &udc->ep[udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK];
+ if (ep->halted)
+ status = 1 << USB_ENDPOINT_HALT;
+ break;
+ default:
+ goto stall;
+ }
+
+ status = cpu_to_le16(status);
+ spi_wr_buf(udc, MAX3420_REG_EP0FIFO, &status, 2);
+ spi_wr8_ack(udc, MAX3420_REG_EP0BC, 2, 1);
+ return;
+stall:
+ dev_err(udc->dev, "Can't respond to getstatus request\n");
+ spi_wr8(udc, MAX3420_REG_EPSTALLS, bSTLEP0IN | bSTLEP0OUT | bSTLSTAT);
+}
+
+static void max3420_set_clear_feature(struct max3420_udc *udc)
+{
+ int set = udc->setup.bRequest == USB_REQ_SET_FEATURE;
+ struct max3420_ep *ep;
+ int id;
+
+ switch (udc->setup.bRequestType) {
+ case USB_RECIP_DEVICE:
+ if (udc->setup.wValue != USB_DEVICE_REMOTE_WAKEUP)
+ break;
+
+ if (udc->setup.bRequest == USB_REQ_SET_FEATURE)
+ udc->remote_wkp = 1;
+ else
+ udc->remote_wkp = 0;
+
+ return spi_ack_ctrl(udc);
+
+ case USB_RECIP_ENDPOINT:
+ if (udc->setup.wValue != USB_ENDPOINT_HALT)
+ break;
+
+ id = udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK;
+ ep = &udc->ep[id];
+
+ max3420_ep_set_halt(&ep->ep_usb, set);
+ return;
+ default:
+ break;
+ }
+
+ dev_err(udc->dev, "Can't respond to SET/CLEAR FEATURE\n");
+ spi_wr8(udc, MAX3420_REG_EPSTALLS, bSTLEP0IN | bSTLEP0OUT | bSTLSTAT);
+}
+
+static void max3420_handle_setup(struct max3420_udc *udc)
+{
+ struct usb_ctrlrequest setup;
+ u8 addr;
+
+ spi_rd_buf(udc, MAX3420_REG_SUDFIFO, (void *)&setup, 8);
+
+ udc->setup = setup;
+ udc->setup.wValue = cpu_to_le16(setup.wValue);
+ udc->setup.wIndex = cpu_to_le16(setup.wIndex);
+ udc->setup.wLength = cpu_to_le16(setup.wLength);
+
+ switch (udc->setup.bRequest) {
+ case USB_REQ_GET_STATUS:
+ /* Data+Status phase form udc */
+ if ((udc->setup.bRequestType &
+ (USB_DIR_IN | USB_TYPE_MASK)) !=
+ (USB_DIR_IN | USB_TYPE_STANDARD)) {
+ break;
+ }
+ return max3420_getstatus(udc);
+ case USB_REQ_SET_ADDRESS:
+ /* Status phase from udc */
+ if (udc->setup.bRequestType != (USB_DIR_OUT |
+ USB_TYPE_STANDARD | USB_RECIP_DEVICE))
+ break;
+ addr = spi_rd8_ack(udc, MAX3420_REG_FNADDR, 1);
+ dev_dbg(udc->dev, "Assigned Address=%d/%d\n",
+ udc->setup.wValue, addr);
+ return;
+ case USB_REQ_CLEAR_FEATURE:
+ case USB_REQ_SET_FEATURE:
+ /* Requests with no data phase, status phase from udc */
+ if ((udc->setup.bRequestType & USB_TYPE_MASK)
+ != USB_TYPE_STANDARD)
+ break;
+ return max3420_set_clear_feature(udc);
+ default:
+ break;
+ }
+
+ if (udc->driver->setup(&udc->gadget, &setup) < 0) {
+ /* Stall EP0 */
+ spi_wr8(udc, MAX3420_REG_EPSTALLS,
+ bSTLEP0IN | bSTLEP0OUT | bSTLSTAT);
+ }
+}
+
+static int do_data(struct max3420_udc *udc, int ep_id, int in)
+{
+ struct max3420_ep *ep = &udc->ep[ep_id];
+ struct max3420_req *req;
+ int done, length, psz;
+ void *buf;
+
+ if (list_empty(&ep->queue))
+ return 0;
+
+ req = list_first_entry(&ep->queue, struct max3420_req, queue);
+ buf = req->usb_req.buf + req->usb_req.actual;
+
+ psz = ep->ep_usb.maxpacket;
+ length = req->usb_req.length - req->usb_req.actual;
+ length = min(length, psz);
+
+ if (length == 0) {
+ done = 1;
+ goto xfer_done;
+ }
+
+ done = 0;
+ if (in) {
+ spi_wr_buf(udc, MAX3420_REG_EP0FIFO + ep_id, buf, length);
+ spi_wr8(udc, MAX3420_REG_EP0BC + ep_id, length);
+ if (length < psz)
+ done = 1;
+ } else {
+ psz = spi_rd8(udc, MAX3420_REG_EP0BC + ep_id);
+ length = min(length, psz);
+ spi_rd_buf(udc, MAX3420_REG_EP0FIFO + ep_id, buf, length);
+ if (length < ep->ep_usb.maxpacket)
+ done = 1;
+ }
+
+ req->usb_req.actual += length;
+
+ if (req->usb_req.actual == req->usb_req.length)
+ done = 1;
+
+xfer_done:
+ if (done) {
+ unsigned long flags;
+
+ list_del_init(&req->queue);
+
+ if (ep_id == 0)
+ spi_ack_ctrl(udc);
+
+ max3420_req_done(req, 0);
+ }
+
+ return 1;
+}
+
+static int max3420_handle_irqs(struct max3420_udc *udc)
+{
+ u8 epien, epirq, usbirq, usbien, reg[4];
+ int ret = 0;
+
+ spi_rd_buf(udc, MAX3420_REG_EPIRQ, reg, 4);
+ epirq = reg[0];
+ epien = reg[1];
+ usbirq = reg[2];
+ usbien = reg[3];
+
+ usbirq &= usbien;
+ epirq &= epien;
+
+ if (epirq & bSUDAVIRQ) {
+ spi_wr8(udc, MAX3420_REG_EPIRQ, bSUDAVIRQ);
+ max3420_handle_setup(udc);
+ return 1;
+ }
+
+ if (usbirq & bVBUSIRQ) {
+ spi_wr8(udc, MAX3420_REG_USBIRQ, bVBUSIRQ);
+ dev_dbg(udc->dev, "Cable plugged in\n");
+ g_dnl_clear_detach();
+ return 1;
+ }
+
+ if (usbirq & bNOVBUSIRQ) {
+ spi_wr8(udc, MAX3420_REG_USBIRQ, bNOVBUSIRQ);
+ dev_dbg(udc->dev, "Cable pulled out\n");
+ g_dnl_trigger_detach();
+ return 1;
+ }
+
+ if (usbirq & bURESIRQ) {
+ spi_wr8(udc, MAX3420_REG_USBIRQ, bURESIRQ);
+ return 1;
+ }
+
+ if (usbirq & bURESDNIRQ) {
+ spi_wr8(udc, MAX3420_REG_USBIRQ, bURESDNIRQ);
+ spi_wr8(udc, MAX3420_REG_USBIEN, bURESDNIRQ | bURESIRQ);
+ spi_wr8(udc, MAX3420_REG_EPIEN, bSUDAVIRQ
+ | bIN0BAVIRQ | bOUT0DAVIRQ);
+ return 1;
+ }
+
+ if (usbirq & bSUSPIRQ) {
+ spi_wr8(udc, MAX3420_REG_USBIRQ, bSUSPIRQ);
+ dev_dbg(udc->dev, "USB Suspend - Enter\n");
+ udc->suspended = true;
+ return 1;
+ }
+
+ if (usbirq & bBUSACTIRQ) {
+ spi_wr8(udc, MAX3420_REG_USBIRQ, bBUSACTIRQ);
+ dev_dbg(udc->dev, "USB Suspend - Exit\n");
+ udc->suspended = false;
+ return 1;
+ }
+
+ if (usbirq & bRWUDNIRQ) {
+ spi_wr8(udc, MAX3420_REG_USBIRQ, bRWUDNIRQ);
+ dev_dbg(udc->dev, "Asked Host to wakeup\n");
+ return 1;
+ }
+
+ if (usbirq & bOSCOKIRQ) {
+ spi_wr8(udc, MAX3420_REG_USBIRQ, bOSCOKIRQ);
+ dev_dbg(udc->dev, "Osc stabilized, start work\n");
+ return 1;
+ }
+
+ if (epirq & bOUT0DAVIRQ && do_data(udc, 0, 0)) {
+ spi_wr8_ack(udc, MAX3420_REG_EPIRQ, bOUT0DAVIRQ, 1);
+ ret = 1;
+ }
+
+ if (epirq & bIN0BAVIRQ && do_data(udc, 0, 1))
+ ret = 1;
+
+ if (epirq & bOUT1DAVIRQ && do_data(udc, 1, 0)) {
+ spi_wr8_ack(udc, MAX3420_REG_EPIRQ, bOUT1DAVIRQ, 1);
+ ret = 1;
+ }
+
+ if (epirq & bIN2BAVIRQ && do_data(udc, 2, 1))
+ ret = 1;
+
+ if (epirq & bIN3BAVIRQ && do_data(udc, 3, 1))
+ ret = 1;
+
+ return ret;
+}
+
+static int max3420_irq(struct max3420_udc *udc)
+{
+ /* needed ? */
+ do_data(udc, 0, 1); /* get done with the EP0 ZLP */
+
+ return max3420_handle_irqs(udc);
+}
+
+static void max3420_setup_eps(struct max3420_udc *udc)
+{
+ int i;
+
+ INIT_LIST_HEAD(&udc->gadget.ep_list);
+ INIT_LIST_HEAD(&udc->ep[0].ep_usb.ep_list);
+
+ for (i = 0; i < MAX3420_MAX_EPS; i++) {
+ struct max3420_ep *ep = &udc->ep[i];
+
+ INIT_LIST_HEAD(&ep->queue);
+
+ ep->id = i;
+ ep->udc = udc;
+ ep->ep_usb.ops = &max3420_ep_ops;
+ ep->ep_usb.name = ep->name;
+ ep->ep_usb.maxpacket = EP_MAX_PACKET;
+
+ if (i == 0) {
+ ep->ep_usb.desc = &ep0_desc;
+ snprintf(ep->name, EPNAME_SIZE, "ep0");
+ continue;
+ }
+
+ list_add_tail(&ep->ep_usb.ep_list, &udc->gadget.ep_list);
+
+ if (i == 1)
+ snprintf(ep->name, EPNAME_SIZE, "ep1out-bulk");
+ else
+ snprintf(ep->name, EPNAME_SIZE, "ep%din-bulk", i);
+ };
+}
+
+static void max3420_setup_spi(struct max3420_udc *udc)
+{
+ u8 reg[8];
+
+ spi_claim_bus(udc->slave);
+ /* necessary? */
+ spi_rd_buf(udc, MAX3420_REG_EPIRQ, reg, 8);
+ /* configure SPI */
+ spi_wr8(udc, MAX3420_REG_PINCTL, bFDUPSPI);
+}
+
+int dm_usb_gadget_handle_interrupts(struct udevice *dev)
+{
+ struct max3420_udc *udc = dev_get_priv(dev);
+
+ return max3420_irq(udc);
+}
+
+static int max3420_udc_probe(struct udevice *dev)
+{
+ struct max3420_udc *udc = dev_get_priv(dev);
+ struct udevice *spid;
+
+ spi_get_bus_and_cs(3, 0, 10000000, SPI_MODE_3, "spi_generic_drv",
+ NULL, &spid, &udc->slave);
+
+ udc->dev = dev;
+ udc->gadget.ep0 = &udc->ep[0].ep_usb;
+ udc->gadget.max_speed = USB_SPEED_FULL;
+ udc->gadget.speed = USB_SPEED_FULL;
+ udc->gadget.is_dualspeed = 0;
+ udc->gadget.ops = &max3420_udc_ops;
+ udc->gadget.name = "max3420-udc";
+
+ max3420_setup_eps(udc);
+ max3420_setup_spi(udc);
+
+ usb_add_gadget_udc((struct device *)dev, &udc->gadget);
+
+ return 0;
+}
+
+static int max3420_udc_remove(struct udevice *dev)
+{
+ struct max3420_udc *udc = dev_get_priv(dev);
+
+ usb_del_gadget_udc(&udc->gadget);
+
+ spi_release_bus(udc->slave);
+
+ return 0;
+}
+
+static const struct udevice_id max3420_ids[] = {
+ { .compatible = "maxim,max3421-udc" },
+ { }
+};
+
+U_BOOT_DRIVER(max3420_generic_udc) = {
+ .name = "max3420-udc",
+ .id = UCLASS_USB_GADGET_GENERIC,
+ .of_match = max3420_ids,
+ .probe = max3420_udc_probe,
+ .remove = max3420_udc_remove,
+ .priv_auto_alloc_size = sizeof(struct max3420_udc),
+};
--
2.20.1
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