[U-Boot] [PATCH v2 1/4] ehci-omap: Clean up added ehci-omap.c
Govindraj
govindraj.ti at gmail.com
Thu Jan 19 09:15:00 CET 2012
On Wed, Jan 18, 2012 at 11:21 PM, Igor Grinberg <grinberg at compulab.co.il> wrote:
> Hi Govindraj,
>
> On 01/17/12 08:10, Govindraj wrote:
>>
>> And just to clarify further there is no code duplication for ulpi read writes
>> in ehci-omap.c done with this patch.
>
> This is not just about code duplication,
> this is also about using the ULPI framework instead of direct writes to the
> ULPI PHYs.
>
>> Patch intends only in configuring ehci to right modes as specified by
>> board file. Modes possible are hsic_mode, tll_mode, ulpi_phy mode.
>>
>> This patch is derived with reference to linux kernel and even there
>> we can see that no ulpi_reg map registers are used and only ehci
>> is configured is respective mode as passed by board data.
>
> This is not correct. They are used, see:
> drivers/usb/host/ehci-omap.c file, omap_ehci_soft_phy_reset() function.
> It does exactly the same, but yes it does not use the ULPI framework,
> because in Linux currently, there is no generic enough ULPI framework,
> so drivers can use it.
linux-2.6/drivers/usb/otg/ulpi.c ?
> There were discussions about it and decided that until there is such
> a framework, things can be done the way they are.
>
>>
>> Here [1] is the patch fixing Marek Vasut <marek.vasut at gmail.com>
>> comments.
>>
>> This corrected patch along with dependent patch from
>> Ilya Yanok <yanok at emcraft.com>
>> [PATCH V4 1/2] ehci-omap: driver for EHCI host on OMAP3
>>
>> Is available here:
>> git://gitorious.org/denx_u-boot/denx_uboot_omap.git v2_ehci_omap
>>
>> --
>> Thanks,
>> Govindraj.R
>>
>> [1]:
>>
>>>From 56b1b94128495ed4bf83e2f20f3884833e2aa082 Mon Sep 17 00:00:00 2001
>> From: "Govindraj.R" <govindraj.raja at ti.com>
>> Date: Tue, 27 Dec 2011 14:53:12 +0530
>> Subject: [PATCH 2/6] ehci-omap: Clean up added ehci-omap.c
>>
>> Clean up added ehci-omap.c and make it generic for re-use across
>> soc having same ehci ip block. Also pass the modes to be configured
>> and configure the ports accordingly. All usb layers are not cache
>> aligned till then keep cache off for usb ops as ehci will use
>> internally dma for all usb ops.
>>
>> * Add a generic common header ehci-omap.h having common ip block
>> data and reg shifts.
>> * Rename and modify ehci-omap3 to ehci.h retain only conflicting
>> sysc reg shifts remove others and move to common header file.
>>
>> Signed-off-by: Govindraj.R <govindraj.raja at ti.com>
>> ---
>> arch/arm/include/asm/arch-omap3/ehci.h | 55 ++++++
>> arch/arm/include/asm/arch-omap3/ehci_omap3.h | 58 -------
>> arch/arm/include/asm/arch-omap4/ehci.h | 49 ++++++
>> arch/arm/include/asm/ehci-omap.h | 147 +++++++++++++++++
>> drivers/usb/host/ehci-omap.c | 228 +++++++++++++++++++-------
>> 5 files changed, 423 insertions(+), 114 deletions(-)
>> create mode 100644 arch/arm/include/asm/arch-omap3/ehci.h
>> delete mode 100644 arch/arm/include/asm/arch-omap3/ehci_omap3.h
>> create mode 100644 arch/arm/include/asm/arch-omap4/ehci.h
>> create mode 100644 arch/arm/include/asm/ehci-omap.h
>>
>> diff --git a/arch/arm/include/asm/arch-omap3/ehci.h
>> b/arch/arm/include/asm/arch-omap3/ehci.h
>> new file mode 100644
>> index 0000000..d622363
>> --- /dev/null
>> +++ b/arch/arm/include/asm/arch-omap3/ehci.h
>> @@ -0,0 +1,55 @@
>> +/*
>> + * (C) Copyright 2011
>> + * Alexander Holler <holler at ahsoftware.de>
>> + *
>> + * Based on "drivers/usb/host/ehci-omap.c" from Linux 2.6.37
>> + *
>> + * See there for additional Copyrights.
>> + *
>> + * See file CREDITS for list of people who contributed to this
>> + * project.
>> + *
>> + * 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.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program; if not, write to the Free Software
>> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
>> + * MA 02110-1301 USA
>> + */
>> +#ifndef _EHCI_H_
>> +#define _EHCI_H_
>
> hmmm... isn't it too generic?
> I think you should have included a part of the path to the file,
> so no namespace collision will occure.
> something like _OMAP3_EHCI_H_?
>
since these include's are part of arch folder
will not collide with other ones.
But still its better to have _OMAP3_EHCI_H_
will correct this.
>> +
>> +/* USB/EHCI registers */
>> +#define OMAP_USBTLL_BASE 0x48062000UL
>> +#define OMAP_UHH_BASE 0x48064000UL
>> +#define OMAP_EHCI_BASE 0x48064800UL
>> +
>> +/* TLL Register Set */
>> +#define OMAP_USBTLL_SYSCONFIG_SOFTRESET (1 << 1)
>> +#define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP (1 << 2)
>> +#define OMAP_USBTLL_SYSCONFIG_SIDLEMODE (1 << 3)
>> +#define OMAP_USBTLL_SYSCONFIG_CACTIVITY (1 << 8)
>> +#define OMAP_USBTLL_SYSSTATUS_RESETDONE 1
>> +
>> +/* UHH Register Set */
>> +#define OMAP_UHH_SYSCONFIG_SOFTRESET (1 << 1)
>> +#define OMAP_UHH_SYSCONFIG_CACTIVITY (1 << 8)
>> +#define OMAP_UHH_SYSCONFIG_SIDLEMODE (1 << 3)
>> +#define OMAP_UHH_SYSCONFIG_ENAWAKEUP (1 << 2)
>> +#define OMAP_UHH_SYSCONFIG_MIDLEMODE (1 << 12)
>> +#define OMAP_UHH_SYSSTATUS_EHCI_RESETDONE (1 << 2)
>> +
>> +#define OMAP_UHH_SYSCONFIG_VAL (OMAP_UHH_SYSCONFIG_CACTIVITY | \
>> + OMAP_UHH_SYSCONFIG_SIDLEMODE | \
>> + OMAP_UHH_SYSCONFIG_ENAWAKEUP | \
>> + OMAP_UHH_SYSCONFIG_MIDLEMODE)
>> +
>> +#endif /* _EHCI_H_ */
>> diff --git a/arch/arm/include/asm/arch-omap3/ehci_omap3.h
>> b/arch/arm/include/asm/arch-omap3/ehci_omap3.h
>> deleted file mode 100644
>> index cd01f50..0000000
>> --- a/arch/arm/include/asm/arch-omap3/ehci_omap3.h
>> +++ /dev/null
>> @@ -1,58 +0,0 @@
>> -/*
>> - * (C) Copyright 2011
>> - * Alexander Holler <holler at ahsoftware.de>
>> - *
>> - * Based on "drivers/usb/host/ehci-omap.c" from Linux 2.6.37
>> - *
>> - * See there for additional Copyrights.
>> - *
>> - * See file CREDITS for list of people who contributed to this
>> - * project.
>> - *
>> - * 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.
>> - *
>> - * This program is distributed in the hope that it will be useful,
>> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> - * GNU General Public License for more details.
>> - *
>> - * You should have received a copy of the GNU General Public License
>> - * along with this program; if not, write to the Free Software
>> - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
>> - * MA 02110-1301 USA
>> - */
>> -#ifndef _EHCI_OMAP3_H_
>> -#define _EHCI_OMAP3_H_
>> -
>> -/* USB/EHCI registers */
>> -#define OMAP3_USBTLL_BASE 0x48062000UL
>> -#define OMAP3_UHH_BASE 0x48064000UL
>> -#define OMAP3_EHCI_BASE 0x48064800UL
>> -
>> -/* TLL Register Set */
>> -#define OMAP_USBTLL_SYSCONFIG (0x10)
>> -#define OMAP_USBTLL_SYSCONFIG_SOFTRESET (1 << 1)
>> -#define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP (1 << 2)
>> -#define OMAP_USBTLL_SYSCONFIG_SIDLEMODE (1 << 3)
>> -#define OMAP_USBTLL_SYSCONFIG_CACTIVITY (1 << 8)
>> -
>> -#define OMAP_USBTLL_SYSSTATUS (0x14)
>> -#define OMAP_USBTLL_SYSSTATUS_RESETDONE (1 << 0)
>> -
>> -/* UHH Register Set */
>> -#define OMAP_UHH_SYSCONFIG (0x10)
>> -#define OMAP_UHH_SYSCONFIG_SOFTRESET (1 << 1)
>> -#define OMAP_UHH_SYSCONFIG_CACTIVITY (1 << 8)
>> -#define OMAP_UHH_SYSCONFIG_SIDLEMODE (1 << 3)
>> -#define OMAP_UHH_SYSCONFIG_ENAWAKEUP (1 << 2)
>> -#define OMAP_UHH_SYSCONFIG_MIDLEMODE (1 << 12)
>> -
>> -#define OMAP_UHH_HOSTCONFIG (0x40)
>> -#define OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN (1 << 2)
>> -#define OMAP_UHH_HOSTCONFIG_INCR8_BURST_EN (1 << 3)
>> -#define OMAP_UHH_HOSTCONFIG_INCR16_BURST_EN (1 << 4)
>> -
>> -#endif /* _EHCI_OMAP3_H_ */
>> diff --git a/arch/arm/include/asm/arch-omap4/ehci.h
>> b/arch/arm/include/asm/arch-omap4/ehci.h
>> new file mode 100644
>> index 0000000..eaa82cf
>> --- /dev/null
>> +++ b/arch/arm/include/asm/arch-omap4/ehci.h
>> @@ -0,0 +1,49 @@
>> +/*
>> + * OMAP EHCI port support
>> + * Based on LINUX KERNEL
>> + * drivers/usb/host/ehci-omap.c and drivers/mfd/omap-usb-host.c
>> + *
>> + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
>> + * Author: Govindraj R <govindraj.raja at ti.com>
>> + *
>> + * This program is free software: you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 of
>> + * the License as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
>> + */
>> +
>> +#ifndef _EHCI_H
>> +#define _EHCI_H
>
> see what I mean? above you have _EHCI_H_ and here _EHCI_H...
> That is too confusing...
> IMO, something like _OMAP4_EHCI_H_ will do here.
>
will correct it.
>> +
>> +#define OMAP_EHCI_BASE (OMAP44XX_L4_CORE_BASE + 0x64C00)
>> +#define OMAP_UHH_BASE (OMAP44XX_L4_CORE_BASE + 0x64000)
>> +#define OMAP_USBTLL_BASE (OMAP44XX_L4_CORE_BASE + 0x62000)
>> +
>> +/* UHH, TLL and opt clocks */
>> +#define CM_L3INIT_HSUSBHOST_CLKCTRL 0x4A009358UL
>> +
>> +#define HSUSBHOST_CLKCTRL_CLKSEL_UTMI_P1_MASK (1 << 24)
>> +
>> +/* TLL Register Set */
>> +#define OMAP_USBTLL_SYSCONFIG_SIDLEMODE (1 << 3)
>> +#define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP (1 << 2)
>> +#define OMAP_USBTLL_SYSCONFIG_SOFTRESET (1 << 1)
>> +#define OMAP_USBTLL_SYSCONFIG_CACTIVITY (1 << 8)
>> +#define OMAP_USBTLL_SYSSTATUS_RESETDONE 1
>> +
>> +#define OMAP_UHH_SYSCONFIG_SOFTRESET 1
>> +#define OMAP_UHH_SYSSTATUS_EHCI_RESETDONE (1 << 2)
>> +#define OMAP_UHH_SYSCONFIG_NOIDLE (1 << 2)
>> +#define OMAP_UHH_SYSCONFIG_NOSTDBY (1 << 4)
>> +
>> +#define OMAP_UHH_SYSCONFIG_VAL (OMAP_UHH_SYSCONFIG_NOIDLE | \
>> + OMAP_UHH_SYSCONFIG_NOSTDBY)
>> +
>> +#endif /* _EHCI_H */
>> diff --git a/arch/arm/include/asm/ehci-omap.h b/arch/arm/include/asm/ehci-omap.h
>> new file mode 100644
>> index 0000000..ac68db7
>> --- /dev/null
>> +++ b/arch/arm/include/asm/ehci-omap.h
>> @@ -0,0 +1,147 @@
>> +/*
>> + * OMAP EHCI port support
>> + * Based on LINUX KERNEL
>> + * drivers/usb/host/ehci-omap.c and drivers/mfd/omap-usb-host.c
>> + *
>> + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com*
>> + * Author: Govindraj R <govindraj.raja at ti.com>
>> + *
>> + * This program is free software: you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 of
>> + * the License as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
>> + */
>> +
>> +#ifndef EHCI_H
>> +#define EHCI_H
>
> And even worth... now there are three of them!!!
> No, this is not good... what about OMAP5 will it be EHCI__H?
> Probably here, something like _OMAP_COMMON_EHCI_H_ will do?
>
sure will do it.
>> +
>> +enum usbhs_omap_port_mode {
>> + OMAP_USBHS_PORT_MODE_UNUSED,
>> + OMAP_EHCI_PORT_MODE_PHY,
>> + OMAP_EHCI_PORT_MODE_TLL,
>> + OMAP_EHCI_PORT_MODE_HSIC,
>> +};
>> +
>> +#ifdef CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS
>> +#define OMAP_HS_USB_PORTS CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS
>> +#else
>> +#define OMAP_HS_USB_PORTS 3
>> +#endif
>> +
>> +#define is_ehci_phy_mode(x) ((x) == OMAP_EHCI_PORT_MODE_PHY)
>> +#define is_ehci_tll_mode(x) ((x) == OMAP_EHCI_PORT_MODE_TLL)
>> +#define is_ehci_hsic_mode(x) ((x) == OMAP_EHCI_PORT_MODE_HSIC)
>> +
>> +/* Values of UHH_REVISION - Note: these are not given in the TRM */
>> +#define OMAP_USBHS_REV1 0x00000010 /* OMAP3 */
>> +#define OMAP_USBHS_REV2 0x50700100 /* OMAP4 */
>> +
>> +/* UHH Register Set */
>> +#define OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN (1 << 2)
>> +#define OMAP_UHH_HOSTCONFIG_INCR8_BURST_EN (1 << 3)
>> +#define OMAP_UHH_HOSTCONFIG_INCR16_BURST_EN (1 << 4)
>> +#define OMAP_UHH_HOSTCONFIG_INCRX_ALIGN_EN (1 << 5)
>> +
>> +#define OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS 1
>> +#define OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS (1 << 11)
>> +#define OMAP_UHH_HOSTCONFIG_ULPI_P3_BYPASS (1 << 12)
>> +#define OMAP4_UHH_HOSTCONFIG_APP_START_CLK (1 << 31)
>> +
>> +#define OMAP_P1_MODE_CLEAR (3 << 16)
>> +#define OMAP_P1_MODE_TLL (1 << 16)
>> +#define OMAP_P1_MODE_HSIC (3 << 16)
>> +#define OMAP_P2_MODE_CLEAR (3 << 18)
>> +#define OMAP_P2_MODE_TLL (1 << 18)
>> +#define OMAP_P2_MODE_HSIC (3 << 18)
>> +
>> +/* EHCI Register Set */
>> +#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
>> +#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
>> +#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
>> +#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
>> +#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
>> +
>> +#define OMAP_REV1_TLL_CHANNEL_COUNT 3
>> +#define OMAP_REV2_TLL_CHANNEL_COUNT 2
>> +
>> +/* TLL Register Set */
>> +#define OMAP_TLL_CHANNEL_CONF(num) (0x004 * num)
>> +#define OMAP_TLL_CHANNEL_CONF_DRVVBUS (1 << 16)
>> +#define OMAP_TLL_CHANNEL_CONF_CHRGVBUS (1 << 15)
>> +#define OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF (1 << 11)
>> +#define OMAP_TLL_CHANNEL_CONF_CHANMODE_TRANSPARENT_UTMI (2 << 1)
>> +#define OMAP_TLL_CHANNEL_CONF_CHANEN 1
>> +
>> +/* ULPI */
>> +#define ULPI_SET(a) (a + 1)
>
> This is the offset of each "set" register of ULPI PHY
>
>> +#define ULPI_CLR(a) (a + 2)
>
> This is the offset of each "clear" register of ULPI PHY
>
>> +#define ULPI_FUNC_CTRL 0x04
>
> This is the offset of the "Function Control register" of the ULPI PHY
> This is already defined as ulpi_regs.function_ctrl member in
> include/usb/ulpi.h file.
>
>> +#define ULPI_FUNC_CTRL_RESET (1 << 5)
>
> This is the reset bin inside the "Function Control register" of the ULPI PHY
> This bit is already defined in the include/usb/ulpi.h file.
>
yes but these are not dedicated reg maps that can be written.
on omap usb host controller is coupled with tll module to compose the
ULPI TLL interface
and the way to speak to them is using the INSNREG05_ULPI which has the
reg address field
and value to be written.
ulpi framework needs a full reg map to read write registers.
[..]
ulpi_write(ulpi_viewport,
&ulpi->function_ctrl_set, ULPI_FC_RESET);
[..]
from above code snip what we need is dedicated ulpi reg start address
to get func ctrl.
so these api's cannot be used.
>> +
>> +struct omap_usbhs_board_data {
>> + enum usbhs_omap_port_mode port_mode[OMAP_HS_USB_PORTS];
>> +};
>> +
>> +struct omap_usbtll {
>> + u32 rev; /* 0x00 */
>> + u32 hwinfo; /* 0x04 */
>> + u8 reserved1[0x8];
>> + u32 sysc; /* 0x10 */
[...]
>> +}
>> +
>> +static void omap_ehci_soft_phy_reset(int port)
>> +{
>> + unsigned int reg = 0;
>> + unsigned long init = get_timer(0);
>> +
>> + /* FUNCTION_CTRL_SET register */
>> + reg = ULPI_FUNC_CTRL_RESET |
>> + (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT) |
>> + (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT) |
>> + ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT) |
>> + (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT);
>> +
>> + writel(reg, &ehci->insreg05_utmi_ulpi);
>> +
>> + /* Wait for ULPI access completion */
>> + while ((readl(&ehci->insreg05_utmi_ulpi) &
>> + (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT)))
>> + if (get_timer(init) > CONFIG_SYS_HZ) {
>> + debug("OMAP EHCI error: timeout resetting phy\n");
>> + break;
>> + }
>> +}
>
> Ok, this function is kind of "duplication" of the ULPI code.
> ulpi_reset() function in drivers/usb/ulpi/ulpi.c provides an implementation
> of the ULPI spec. and should be used by the drivers.
> What it lacks currently, is a way to pass a port number to the viewport
> implementation and of course the omap-ulpi-viewport(.c) implementation itself...
> So, IMO, the right way would be to implement ULPI accessors (omap-ulpi-viewport.c)
so you mean add omap-ulpi-viewport.c which will do ulpi read writes
for ulpi implementation
within tll module of omap host controller.
we just need func reset to be done for ulpi which is done using ehci register
INSNREG05_ULPI. IMHO I don't see any use case or true requirement of
omap-ulpi-viewport.c framework.
> and add an ability to pass some kind of private data to the viewport, which
> in case of OMAP will be the port number.
>
> Now, I know, that this will add much more code then this function does, but
> it is always about using frameworks, otherwise each board file can implement
> the whole U-Boot startup....
>
> +
>> inline int __board_usb_init(void)
>> {
>> return 0;
>> @@ -72,31 +151,31 @@ static inline void omap_ehci_phy_reset(int on, int delay)
>> #endif
>>
>> /* Reset is needed otherwise the kernel-driver will throw an error. */
>> -int ehci_hcd_stop(void)
>> +int omap_ehci_hcd_stop(void)
>> {
>> - debug("Resetting OMAP3 EHCI\n");
>> + debug("Resetting OMAP EHCI\n");
>> omap_ehci_phy_reset(1, 0);
>> - writel(OMAP_UHH_SYSCONFIG_SOFTRESET,
>> - OMAP3_UHH_BASE + OMAP_UHH_SYSCONFIG);
>> - /* disable USB clocks */
>> - struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
>> - sr32(&prcm_base->iclken_usbhost, 0, 1, 0);
>> - sr32(&prcm_base->fclken_usbhost, 0, 2, 0);
>> - sr32(&prcm_base->iclken3_core, 2, 1, 0);
>> - sr32(&prcm_base->fclken3_core, 2, 1, 0);
>> +
>> + if (omap_uhh_reset() < 0)
>> + return -1;
>> +
>> + if (omap_ehci_tll_reset() < 0)
>> + return -1;
>> +
>> return 0;
>> }
>>
>> /*
>> - * Initialize the OMAP3 EHCI controller and PHY.
>> - * Based on "drivers/usb/host/ehci-omap.c" from Linux 2.6.37.
>> + * Initialize the OMAP EHCI controller and PHY.
>> + * Based on "drivers/usb/host/ehci-omap.c" from Linux 3.1
>> * See there for additional Copyrights.
>> */
>> -int ehci_hcd_init(void)
>> +int omap_ehci_hcd_init(struct omap_usbhs_board_data *usbhs_pdata)
>> {
>> - int ret;
>> + int ret = 0;
>> + unsigned int i, reg = 0, rev = 0, tll_cnt = 0;
>>
>> - debug("Initializing OMAP3 EHCI\n");
>> + debug("Initializing OMAP EHCI\n");
>>
>> ret = board_usb_init();
>> if (ret < 0)
>> @@ -105,52 +184,89 @@ int ehci_hcd_init(void)
>> /* Put the PHY in RESET */
>> omap_ehci_phy_reset(1, 10);
>>
>> - struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
>> - /* Enable USBHOST_L3_ICLK (USBHOST_MICLK) */
>> - sr32(&prcm_base->iclken_usbhost, 0, 1, 1);
>> - /*
>> - * Enable USBHOST_48M_FCLK (USBHOST_FCLK1)
>> - * and USBHOST_120M_FCLK (USBHOST_FCLK2)
>> - */
>> - sr32(&prcm_base->fclken_usbhost, 0, 2, 3);
>> - /* Enable USBTTL_ICLK */
>> - sr32(&prcm_base->iclken3_core, 2, 1, 1);
>> - /* Enable USBTTL_FCLK */
>> - sr32(&prcm_base->fclken3_core, 2, 1, 1);
>> - debug("USB clocks enabled\n");
>> + ret = omap_uhh_reset();
>> + if (ret < 0)
>> + return ret;
>>
>> - /* perform TLL soft reset, and wait until reset is complete */
>> - writel(OMAP_USBTLL_SYSCONFIG_SOFTRESET,
>> - OMAP3_USBTLL_BASE + OMAP_USBTLL_SYSCONFIG);
>> - /* Wait for TLL reset to complete */
>> - while (!(readl(OMAP3_USBTLL_BASE + OMAP_USBTLL_SYSSTATUS)
>> - & OMAP_USBTLL_SYSSTATUS_RESETDONE))
>> - ;
>> - debug("TLL reset done\n");
>> + ret = omap_ehci_tll_reset();
>> + if (ret)
>> + return ret;
>
> You do both resets unconditionally, shouldn't you check which mode
> the port is in and only reset the right one?
> Is it because all of them need to be configurred?
>
yes, and to set sys_config register settings.
--
Thanks,
Govindraj.R
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