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linux-next/arch/powerpc/platforms/83xx/usb.c
Anton Vorontsov 1a9ebc0cd2 [POWERPC] 83xx: mpc8315 - fix USB UTMI Host setup 
Currently USB Host isn't functional on the MPC8315E boards, for two
reasons as described below.

MPC8315 Reference Manual says:
"The USB DR unit must have the same clock ratio as the encryption core
unit, unless one of them has its clock disabled."

The encryption core also drives I2C clock, so it is enabled and is equal
to 01. That means USBDRCM should be 01 here.

Plus, according to MPC8315E-RDB schematics, USB unit consumes CLK_IN
clock from the 24.00MHz oscillator, which means we must adjust REFSEL
bits as well.

p.s.
Idially we should rework whole 83xx/usb.c code, in two steps:
1. Move SCCR code to the U-Boot;
2. Implement fsl,usb-clock property in the device tree, so usb.c could
   decide what clock exactly to use on per-board basis.

Though, today we're not in a hurry since there is just one 8315e board
out there.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-04-17 09:52:50 -05:00

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/*
* Freescale 83xx USB SOC setup code
*
* Copyright (C) 2007 Freescale Semiconductor, Inc.
* Author: Li Yang
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <sysdev/fsl_soc.h>
#include "mpc83xx.h"
#ifdef CONFIG_PPC_MPC834x
int mpc834x_usb_cfg(void)
{
unsigned long sccr, sicrl, sicrh;
void __iomem *immap;
struct device_node *np = NULL;
int port0_is_dr = 0, port1_is_dr = 0;
const void *prop, *dr_mode;
immap = ioremap(get_immrbase(), 0x1000);
if (!immap)
return -ENOMEM;
/* Read registers */
/* Note: DR and MPH must use the same clock setting in SCCR */
sccr = in_be32(immap + MPC83XX_SCCR_OFFS) & ~MPC83XX_SCCR_USB_MASK;
sicrl = in_be32(immap + MPC83XX_SICRL_OFFS) & ~MPC834X_SICRL_USB_MASK;
sicrh = in_be32(immap + MPC83XX_SICRH_OFFS) & ~MPC834X_SICRH_USB_UTMI;
np = of_find_compatible_node(NULL, NULL, "fsl-usb2-dr");
if (np) {
sccr |= MPC83XX_SCCR_USB_DRCM_11; /* 1:3 */
prop = of_get_property(np, "phy_type", NULL);
if (prop && (!strcmp(prop, "utmi") ||
!strcmp(prop, "utmi_wide"))) {
sicrl |= MPC834X_SICRL_USB0 | MPC834X_SICRL_USB1;
sicrh |= MPC834X_SICRH_USB_UTMI;
port1_is_dr = 1;
} else if (prop && !strcmp(prop, "serial")) {
dr_mode = of_get_property(np, "dr_mode", NULL);
if (dr_mode && !strcmp(dr_mode, "otg")) {
sicrl |= MPC834X_SICRL_USB0 | MPC834X_SICRL_USB1;
port1_is_dr = 1;
} else {
sicrl |= MPC834X_SICRL_USB0;
}
} else if (prop && !strcmp(prop, "ulpi")) {
sicrl |= MPC834X_SICRL_USB0;
} else {
printk(KERN_WARNING "834x USB PHY type not supported\n");
}
port0_is_dr = 1;
of_node_put(np);
}
np = of_find_compatible_node(NULL, NULL, "fsl-usb2-mph");
if (np) {
sccr |= MPC83XX_SCCR_USB_MPHCM_11; /* 1:3 */
prop = of_get_property(np, "port0", NULL);
if (prop) {
if (port0_is_dr)
printk(KERN_WARNING
"834x USB port0 can't be used by both DR and MPH!\n");
sicrl &= ~MPC834X_SICRL_USB0;
}
prop = of_get_property(np, "port1", NULL);
if (prop) {
if (port1_is_dr)
printk(KERN_WARNING
"834x USB port1 can't be used by both DR and MPH!\n");
sicrl &= ~MPC834X_SICRL_USB1;
}
of_node_put(np);
}
/* Write back */
out_be32(immap + MPC83XX_SCCR_OFFS, sccr);
out_be32(immap + MPC83XX_SICRL_OFFS, sicrl);
out_be32(immap + MPC83XX_SICRH_OFFS, sicrh);
iounmap(immap);
return 0;
}
#endif /* CONFIG_PPC_MPC834x */
#ifdef CONFIG_PPC_MPC831x
int mpc831x_usb_cfg(void)
{
u32 temp;
void __iomem *immap, *usb_regs;
struct device_node *np = NULL;
struct device_node *immr_node = NULL;
const void *prop;
struct resource res;
int ret = 0;
#ifdef CONFIG_USB_OTG
const void *dr_mode;
#endif
np = of_find_compatible_node(NULL, NULL, "fsl-usb2-dr");
if (!np)
return -ENODEV;
prop = of_get_property(np, "phy_type", NULL);
/* Map IMMR space for pin and clock settings */
immap = ioremap(get_immrbase(), 0x1000);
if (!immap) {
of_node_put(np);
return -ENOMEM;
}
/* Configure clock */
immr_node = of_get_parent(np);
if (immr_node && of_device_is_compatible(immr_node, "fsl,mpc8315-immr"))
clrsetbits_be32(immap + MPC83XX_SCCR_OFFS,
MPC8315_SCCR_USB_MASK,
MPC8315_SCCR_USB_DRCM_01);
else
clrsetbits_be32(immap + MPC83XX_SCCR_OFFS,
MPC83XX_SCCR_USB_MASK,
MPC83XX_SCCR_USB_DRCM_11);
/* Configure pin mux for ULPI. There is no pin mux for UTMI */
if (prop && !strcmp(prop, "ulpi")) {
temp = in_be32(immap + MPC83XX_SICRL_OFFS);
temp &= ~MPC831X_SICRL_USB_MASK;
temp |= MPC831X_SICRL_USB_ULPI;
out_be32(immap + MPC83XX_SICRL_OFFS, temp);
temp = in_be32(immap + MPC83XX_SICRH_OFFS);
temp &= ~MPC831X_SICRH_USB_MASK;
temp |= MPC831X_SICRH_USB_ULPI;
out_be32(immap + MPC83XX_SICRH_OFFS, temp);
}
iounmap(immap);
if (immr_node)
of_node_put(immr_node);
/* Map USB SOC space */
ret = of_address_to_resource(np, 0, &res);
if (ret) {
of_node_put(np);
return ret;
}
usb_regs = ioremap(res.start, res.end - res.start + 1);
/* Using on-chip PHY */
if (prop && (!strcmp(prop, "utmi_wide") ||
!strcmp(prop, "utmi"))) {
u32 refsel;
if (of_device_is_compatible(immr_node, "fsl,mpc8315-immr"))
refsel = CONTROL_REFSEL_24MHZ;
else
refsel = CONTROL_REFSEL_48MHZ;
/* Set UTMI_PHY_EN and REFSEL */
out_be32(usb_regs + FSL_USB2_CONTROL_OFFS,
CONTROL_UTMI_PHY_EN | refsel);
/* Using external UPLI PHY */
} else if (prop && !strcmp(prop, "ulpi")) {
/* Set PHY_CLK_SEL to ULPI */
temp = CONTROL_PHY_CLK_SEL_ULPI;
#ifdef CONFIG_USB_OTG
/* Set OTG_PORT */
dr_mode = of_get_property(np, "dr_mode", NULL);
if (dr_mode && !strcmp(dr_mode, "otg"))
temp |= CONTROL_OTG_PORT;
#endif /* CONFIG_USB_OTG */
out_be32(usb_regs + FSL_USB2_CONTROL_OFFS, temp);
} else {
printk(KERN_WARNING "831x USB PHY type not supported\n");
ret = -EINVAL;
}
iounmap(usb_regs);
of_node_put(np);
return ret;
}
#endif /* CONFIG_PPC_MPC831x */
#ifdef CONFIG_PPC_MPC837x
int mpc837x_usb_cfg(void)
{
void __iomem *immap;
struct device_node *np = NULL;
const void *prop;
int ret = 0;
np = of_find_compatible_node(NULL, NULL, "fsl-usb2-dr");
if (!np)
return -ENODEV;
prop = of_get_property(np, "phy_type", NULL);
if (!prop || (strcmp(prop, "ulpi") && strcmp(prop, "serial"))) {
printk(KERN_WARNING "837x USB PHY type not supported\n");
of_node_put(np);
return -EINVAL;
}
/* Map IMMR space for pin and clock settings */
immap = ioremap(get_immrbase(), 0x1000);
if (!immap) {
of_node_put(np);
return -ENOMEM;
}
/* Configure clock */
clrsetbits_be32(immap + MPC83XX_SCCR_OFFS, MPC837X_SCCR_USB_DRCM_11,
MPC837X_SCCR_USB_DRCM_11);
/* Configure pin mux for ULPI/serial */
clrsetbits_be32(immap + MPC83XX_SICRL_OFFS, MPC837X_SICRL_USB_MASK,
MPC837X_SICRL_USB_ULPI);
iounmap(immap);
of_node_put(np);
return ret;
}
#endif /* CONFIG_PPC_MPC837x */
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