u-boot/drivers/usb/host/ehci-fsl.c
Nikhil Badola 0dc78ff857 drivers: usb: fsl: Workaround for Erratum A004477
Add a delay of 1 microsecond before issuing soft reset to the
controller to let ongoing ULPI transaction complete.
This prevents corruption of ULPI Function Control Register which
eventually prevents phy clock from entering to low power mode

Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
2015-05-04 09:23:50 -07:00

370 lines
9.1 KiB
C

/*
* (C) Copyright 2009, 2011 Freescale Semiconductor, Inc.
*
* (C) Copyright 2008, Excito Elektronik i Sk=E5ne AB
*
* Author: Tor Krill tor@excito.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <pci.h>
#include <usb.h>
#include <asm/io.h>
#include <usb/ehci-fsl.h>
#include <hwconfig.h>
#include <fsl_usb.h>
#include <fdt_support.h>
#include "ehci.h"
#ifndef CONFIG_USB_MAX_CONTROLLER_COUNT
#define CONFIG_USB_MAX_CONTROLLER_COUNT 1
#endif
static void set_txfifothresh(struct usb_ehci *, u32);
/* Check USB PHY clock valid */
static int usb_phy_clk_valid(struct usb_ehci *ehci)
{
if (!((in_be32(&ehci->control) & PHY_CLK_VALID) ||
in_be32(&ehci->prictrl))) {
printf("USB PHY clock invalid!\n");
return 0;
} else {
return 1;
}
}
/*
* Create the appropriate control structures to manage
* a new EHCI host controller.
*
* Excerpts from linux ehci fsl driver.
*/
int ehci_hcd_init(int index, enum usb_init_type init,
struct ehci_hccr **hccr, struct ehci_hcor **hcor)
{
struct usb_ehci *ehci = NULL;
const char *phy_type = NULL;
size_t len;
char current_usb_controller[5];
#ifdef CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY
char usb_phy[5];
usb_phy[0] = '\0';
#endif
if (has_erratum_a007075()) {
/*
* A 5ms delay is needed after applying soft-reset to the
* controller to let external ULPI phy come out of reset.
* This delay needs to be added before re-initializing
* the controller after soft-resetting completes
*/
mdelay(5);
}
memset(current_usb_controller, '\0', 5);
snprintf(current_usb_controller, 4, "usb%d", index+1);
switch (index) {
case 0:
ehci = (struct usb_ehci *)CONFIG_SYS_FSL_USB1_ADDR;
break;
case 1:
ehci = (struct usb_ehci *)CONFIG_SYS_FSL_USB2_ADDR;
break;
default:
printf("ERROR: wrong controller index!!\n");
break;
};
*hccr = (struct ehci_hccr *)((uint32_t)&ehci->caplength);
*hcor = (struct ehci_hcor *)((uint32_t) *hccr +
HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
/* Set to Host mode */
setbits_le32(&ehci->usbmode, CM_HOST);
out_be32(&ehci->snoop1, SNOOP_SIZE_2GB);
out_be32(&ehci->snoop2, 0x80000000 | SNOOP_SIZE_2GB);
/* Init phy */
if (hwconfig_sub(current_usb_controller, "phy_type"))
phy_type = hwconfig_subarg(current_usb_controller,
"phy_type", &len);
else
phy_type = getenv("usb_phy_type");
if (!phy_type) {
#ifdef CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY
/* if none specified assume internal UTMI */
strcpy(usb_phy, "utmi");
phy_type = usb_phy;
#else
printf("WARNING: USB phy type not defined !!\n");
return -1;
#endif
}
if (!strncmp(phy_type, "utmi", 4)) {
#if defined(CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY)
clrsetbits_be32(&ehci->control, CONTROL_REGISTER_W1C_MASK,
PHY_CLK_SEL_UTMI);
clrsetbits_be32(&ehci->control, CONTROL_REGISTER_W1C_MASK,
UTMI_PHY_EN);
udelay(1000); /* delay required for PHY Clk to appear */
#endif
out_le32(&(*hcor)->or_portsc[0], PORT_PTS_UTMI);
clrsetbits_be32(&ehci->control, CONTROL_REGISTER_W1C_MASK,
USB_EN);
} else {
clrsetbits_be32(&ehci->control, CONTROL_REGISTER_W1C_MASK,
PHY_CLK_SEL_ULPI);
clrsetbits_be32(&ehci->control, UTMI_PHY_EN |
CONTROL_REGISTER_W1C_MASK, USB_EN);
udelay(1000); /* delay required for PHY Clk to appear */
if (!usb_phy_clk_valid(ehci))
return -EINVAL;
out_le32(&(*hcor)->or_portsc[0], PORT_PTS_ULPI);
}
out_be32(&ehci->prictrl, 0x0000000c);
out_be32(&ehci->age_cnt_limit, 0x00000040);
out_be32(&ehci->sictrl, 0x00000001);
in_le32(&ehci->usbmode);
if (has_erratum_a007798())
set_txfifothresh(ehci, TXFIFOTHRESH);
if (has_erratum_a004477()) {
/*
* When reset is issued while any ULPI transaction is ongoing
* then it may result to corruption of ULPI Function Control
* Register which eventually causes phy clock to enter low
* power mode which stops the clock. Thus delay is required
* before reset to let ongoing ULPI transaction complete.
*/
udelay(1);
}
return 0;
}
/*
* Destroy the appropriate control structures corresponding
* the the EHCI host controller.
*/
int ehci_hcd_stop(int index)
{
return 0;
}
/*
* Setting the value of TXFIFO_THRESH field in TXFILLTUNING register
* to counter DDR latencies in writing data into Tx buffer.
* This prevents Tx buffer from getting underrun
*/
static void set_txfifothresh(struct usb_ehci *ehci, u32 txfifo_thresh)
{
u32 cmd;
cmd = ehci_readl(&ehci->txfilltuning);
cmd &= ~TXFIFO_THRESH_MASK;
cmd |= TXFIFO_THRESH(txfifo_thresh);
ehci_writel(&ehci->txfilltuning, cmd);
}
#if defined(CONFIG_HAS_FSL_DR_USB) || defined(CONFIG_HAS_FSL_MPH_USB)
static int fdt_fixup_usb_mode_phy_type(void *blob, const char *mode,
const char *phy_type, int start_offset)
{
const char *compat_dr = "fsl-usb2-dr";
const char *compat_mph = "fsl-usb2-mph";
const char *prop_mode = "dr_mode";
const char *prop_type = "phy_type";
const char *node_type = NULL;
int node_offset;
int err;
node_offset = fdt_node_offset_by_compatible(blob,
start_offset, compat_mph);
if (node_offset < 0) {
node_offset = fdt_node_offset_by_compatible(blob,
start_offset,
compat_dr);
if (node_offset < 0) {
printf("WARNING: could not find compatible node: %s",
fdt_strerror(node_offset));
return -1;
}
node_type = compat_dr;
} else {
node_type = compat_mph;
}
if (mode) {
err = fdt_setprop(blob, node_offset, prop_mode, mode,
strlen(mode) + 1);
if (err < 0)
printf("WARNING: could not set %s for %s: %s.\n",
prop_mode, node_type, fdt_strerror(err));
}
if (phy_type) {
err = fdt_setprop(blob, node_offset, prop_type, phy_type,
strlen(phy_type) + 1);
if (err < 0)
printf("WARNING: could not set %s for %s: %s.\n",
prop_type, node_type, fdt_strerror(err));
}
return node_offset;
}
static const char *fdt_usb_get_node_type(void *blob, int start_offset,
int *node_offset)
{
const char *compat_dr = "fsl-usb2-dr";
const char *compat_mph = "fsl-usb2-mph";
const char *node_type = NULL;
*node_offset = fdt_node_offset_by_compatible(blob, start_offset,
compat_mph);
if (*node_offset < 0) {
*node_offset = fdt_node_offset_by_compatible(blob,
start_offset,
compat_dr);
if (*node_offset < 0) {
printf("ERROR: could not find compatible node: %s\n",
fdt_strerror(*node_offset));
} else {
node_type = compat_dr;
}
} else {
node_type = compat_mph;
}
return node_type;
}
static int fdt_fixup_usb_erratum(void *blob, const char *prop_erratum,
int start_offset)
{
int node_offset, err;
const char *node_type = NULL;
node_type = fdt_usb_get_node_type(blob, start_offset, &node_offset);
if (!node_type)
return -1;
err = fdt_setprop(blob, node_offset, prop_erratum, NULL, 0);
if (err < 0) {
printf("ERROR: could not set %s for %s: %s.\n",
prop_erratum, node_type, fdt_strerror(err));
}
return node_offset;
}
void fdt_fixup_dr_usb(void *blob, bd_t *bd)
{
static const char * const modes[] = { "host", "peripheral", "otg" };
static const char * const phys[] = { "ulpi", "utmi", "utmi_dual" };
int usb_erratum_a006261_off = -1;
int usb_erratum_a007075_off = -1;
int usb_erratum_a007792_off = -1;
int usb_erratum_a005697_off = -1;
int usb_mode_off = -1;
int usb_phy_off = -1;
char str[5];
int i, j;
for (i = 1; i <= CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
const char *dr_mode_type = NULL;
const char *dr_phy_type = NULL;
int mode_idx = -1, phy_idx = -1;
snprintf(str, 5, "%s%d", "usb", i);
if (hwconfig(str)) {
for (j = 0; j < ARRAY_SIZE(modes); j++) {
if (hwconfig_subarg_cmp(str, "dr_mode",
modes[j])) {
mode_idx = j;
break;
}
}
for (j = 0; j < ARRAY_SIZE(phys); j++) {
if (hwconfig_subarg_cmp(str, "phy_type",
phys[j])) {
phy_idx = j;
break;
}
}
if (mode_idx < 0 && phy_idx < 0) {
printf("WARNING: invalid phy or mode\n");
return;
}
if (mode_idx > -1)
dr_mode_type = modes[mode_idx];
if (phy_idx > -1)
dr_phy_type = phys[phy_idx];
}
if (has_dual_phy())
dr_phy_type = phys[2];
usb_mode_off = fdt_fixup_usb_mode_phy_type(blob,
dr_mode_type, NULL,
usb_mode_off);
if (usb_mode_off < 0)
return;
usb_phy_off = fdt_fixup_usb_mode_phy_type(blob,
NULL, dr_phy_type,
usb_phy_off);
if (usb_phy_off < 0)
return;
if (has_erratum_a006261()) {
usb_erratum_a006261_off = fdt_fixup_usb_erratum
(blob,
"fsl,usb-erratum-a006261",
usb_erratum_a006261_off);
if (usb_erratum_a006261_off < 0)
return;
}
if (has_erratum_a007075()) {
usb_erratum_a007075_off = fdt_fixup_usb_erratum
(blob,
"fsl,usb-erratum-a007075",
usb_erratum_a007075_off);
if (usb_erratum_a007075_off < 0)
return;
}
if (has_erratum_a007792()) {
usb_erratum_a007792_off = fdt_fixup_usb_erratum
(blob,
"fsl,usb-erratum-a007792",
usb_erratum_a007792_off);
if (usb_erratum_a007792_off < 0)
return;
}
if (has_erratum_a005697()) {
usb_erratum_a005697_off = fdt_fixup_usb_erratum
(blob,
"fsl,usb-erratum-a005697",
usb_erratum_a005697_off);
if (usb_erratum_a005697_off < 0)
return;
}
}
}
#endif