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usbdebug: Refactor descriptor probing of dongle

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Organized such that it is easy to support devices that do not
export special Debug Descriptor. Some of these can still work
in a fixed configuration and/or require additional initialisation
for UART clocks etc.

Change-Id: Id07fd6b69007332d67d9e9a456f58fdbca1999cd
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7209
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins)
This commit is contained in:
Kyösti Mälkki
2014-10-27 14:07:28 +02:00
parent 83fe6d7fd2
commit 46249be267
4 changed files with 145 additions and 118 deletions
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119
src/drivers/usb/ehci_debug.c
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@ -31,11 +31,6 @@
#include "usb_ch9.h"
#include "ehci.h"
#define DBGP_MAX_ENDPOINTS 4
#define DBGP_SETUP_EP0 0 /* Compulsory endpoint 0. */
#define DBGP_CONSOLE_EPOUT 1
#define DBGP_CONSOLE_EPIN 2
struct ehci_debug_info {
void *ehci_base;
void *ehci_debug;
@ -54,33 +49,7 @@ static int dbgp_enabled(void);
#endif
#define DBGP_LEN_UPDATE(x, len) (((x) & ~0x0f) | ((len) & 0x0f))
/*
* USB Packet IDs (PIDs)
*/
/* token */
#define USB_PID_OUT 0xe1
#define USB_PID_IN 0x69
#define USB_PID_SOF 0xa5
#define USB_PID_SETUP 0x2d
/* handshake */
#define USB_PID_ACK 0xd2
#define USB_PID_NAK 0x5a
#define USB_PID_STALL 0x1e
#define USB_PID_NYET 0x96
/* data */
#define USB_PID_DATA0 0xc3
#define USB_PID_DATA1 0x4b
#define USB_PID_DATA2 0x87
#define USB_PID_MDATA 0x0f
/* Special */
#define USB_PID_PREAMBLE 0x3c
#define USB_PID_ERR 0x3c
#define USB_PID_SPLIT 0x78
#define USB_PID_PING 0xb4
#define USB_PID_UNDEF_0 0xf0
#define USB_PID_DATA_TOGGLE 0x88
#define DBGP_CLAIM (DBGP_OWNER | DBGP_ENABLED | DBGP_INUSE)
#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
@ -465,11 +434,9 @@ static int usbdebug_init_(unsigned ehci_bar, unsigned offset, struct ehci_debug_
struct ehci_caps *ehci_caps;
struct ehci_regs *ehci_regs;
struct usb_debug_descriptor dbgp_desc;
u32 cmd, ctrl, status, portsc, hcs_params;
u32 debug_port, new_debug_port = 0, n_ports;
u32 devnum;
int ret, i, configured;
int ret, i;
int loop;
int port_map_tried;
int playtimes = 3;
@ -615,90 +582,6 @@ try_next_port:
goto err;
}
/* Find the debug device and make it device number 127 */
devnum = 0;
debug_dev_retry:
memset(&dbgp_desc, 0, sizeof(dbgp_desc));
ret = dbgp_control_msg(ehci_debug, devnum,
USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
USB_REQ_GET_DESCRIPTOR, (USB_DT_DEBUG << 8), 0,
&dbgp_desc, sizeof(dbgp_desc));
if (ret == sizeof(dbgp_desc)) {
if (dbgp_desc.bLength == sizeof(dbgp_desc) && dbgp_desc.bDescriptorType==USB_DT_DEBUG)
goto debug_dev_found;
else
dprintk(BIOS_INFO, "Invalid debug device descriptor.\n");
}
if (devnum == 0) {
devnum = USB_DEBUG_DEVNUM;
goto debug_dev_retry;
} else {
dprintk(BIOS_INFO, "Could not find attached debug device.\n");
ret = -5;
goto err;
}
debug_dev_found:
/* Move the device to 127 if it isn't already there */
if (devnum != USB_DEBUG_DEVNUM) {
ret = dbgp_control_msg(ehci_debug, devnum,
USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
USB_REQ_SET_ADDRESS, USB_DEBUG_DEVNUM, 0, NULL, 0);
if (ret < 0) {
dprintk(BIOS_INFO, "Could not move attached device to %d.\n",
USB_DEBUG_DEVNUM);
ret = -7;
goto err;
}
devnum = USB_DEBUG_DEVNUM;
dprintk(BIOS_INFO, "EHCI debug device renamed to 127.\n");
}
/* Enable the debug interface */
ret = dbgp_control_msg(ehci_debug, USB_DEBUG_DEVNUM,
USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
USB_REQ_SET_FEATURE, USB_DEVICE_DEBUG_MODE, 0, NULL, 0);
if (ret < 0) {
dprintk(BIOS_INFO, "Could not enable EHCI debug device.\n");
ret = -8;
goto err;
}
dprintk(BIOS_INFO, "EHCI debug interface enabled.\n");
/* Prepare endpoint pipes. */
for (i=1; i<DBGP_MAX_ENDPOINTS; i++) {
info->ep_pipe[i].devnum = USB_DEBUG_DEVNUM;
info->ep_pipe[i].pid = USB_PID_DATA0;
info->ep_pipe[i].timeout = 1000;
}
info->ep_pipe[DBGP_CONSOLE_EPOUT].endpoint = dbgp_desc.bDebugOutEndpoint;
info->ep_pipe[DBGP_CONSOLE_EPIN].endpoint = dbgp_desc.bDebugInEndpoint;
/* Perform a small write. */
configured = 0;
small_write:
ret = dbgp_bulk_write(ehci_debug, &info->ep_pipe[DBGP_CONSOLE_EPOUT], "USB\r\n",5);
if (ret < 0) {
dprintk(BIOS_INFO, "dbgp_bulk_write failed: %d\n", ret);
if (!configured) {
/* Send Set Configure request to device. This is required for FX2
(CY7C68013) to transfer from USB state Addressed to Configured,
only then endpoints other than 0 are enabled. */
if (dbgp_control_msg(ehci_debug, USB_DEBUG_DEVNUM,
USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
USB_REQ_SET_CONFIGURATION, 1, 0, NULL, 0) >= 0) {
configured = 1;
goto small_write;
}
}
ret = -9;
goto err;
}
dprintk(BIOS_INFO, "Test write done\n");
info->ep_pipe[DBGP_SETUP_EP0].status |= DBGP_EP_ENABLED | DBGP_EP_VALID;
info->ep_pipe[DBGP_CONSOLE_EPOUT].status |= DBGP_EP_ENABLED | DBGP_EP_VALID;
info->ep_pipe[DBGP_CONSOLE_EPIN].status |= DBGP_EP_ENABLED | DBGP_EP_VALID;
return 0;
err:
/* Things didn't work so remove my claim */