Hi Keshava,
Some doubts / comments .
On Monday 19 March 2012 12:18 PM, Keshava Munegowda wrote:
> From: Keshava Munegowda <[email protected]>
>
> The platform driver for the TLL component of the OMAP USB host controller
> is implemented. Depending on the TLL hardware revision , the TLL channels
> are configured. The USB HS core driver uses this driver through exported
> APIs from the TLL platform driver.
> usb_tll_enable and usb_tll_disble are the exported APIs of the USB TLL
> platform driver.
>
> Signed-off-by: Keshava Munegowda <[email protected]>
> Reviewed-by: Partha Basak <[email protected]>
> ---
> arch/arm/plat-omap/include/plat/usb.h | 8 +
> drivers/mfd/Kconfig | 2 +-
> drivers/mfd/Makefile | 2 +-
> drivers/mfd/omap-usb-tll.c | 463
> +++++++++++++++++++++++++++++++++
> 4 files changed, 473 insertions(+), 2 deletions(-)
> create mode 100644 drivers/mfd/omap-usb-tll.c
>
> diff --git a/arch/arm/plat-omap/include/plat/usb.h
> b/arch/arm/plat-omap/include/plat/usb.h
> index dc864b5..eb1e47d 100644
> --- a/arch/arm/plat-omap/include/plat/usb.h
> +++ b/arch/arm/plat-omap/include/plat/usb.h
> @@ -61,6 +61,10 @@ struct usbhs_omap_platform_data {
> struct ehci_hcd_omap_platform_data *ehci_data;
> struct ohci_hcd_omap_platform_data *ohci_data;
> };
> +
> +struct usbtll_omap_platform_data {
> + enum usbhs_omap_port_mode port_mode[OMAP3_HS_USB_PORTS];
> +};
> /*-------------------------------------------------------------------------*/
>
> #define OMAP1_OTG_BASE 0xfffb0400
> @@ -105,6 +109,10 @@ extern int omap4430_phy_set_clk(struct device *dev, int
> on);
> extern int omap4430_phy_init(struct device *dev);
> extern int omap4430_phy_exit(struct device *dev);
> extern int omap4430_phy_suspend(struct device *dev, int suspend);
> +
> +extern int omap_tll_enable(void);
> +extern int omap_tll_disable(void);
> +
> #endif
>
> extern void am35x_musb_reset(void);
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index f147395..5f75ad4 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -772,7 +772,7 @@ config MFD_WL1273_CORE
> audio codec.
>
> config MFD_OMAP_USB_HOST
> - bool "Support OMAP USBHS core driver"
> + bool "Support OMAP USBHS core and TLL driver"
> depends on USB_EHCI_HCD_OMAP || USB_OHCI_HCD_OMAP3
> default y
> help
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index b953bab..4b3a8e0 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -105,7 +105,7 @@ obj-$(CONFIG_MFD_TPS6586X) += tps6586x.o
> obj-$(CONFIG_MFD_VX855) += vx855.o
> obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o
> obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
> -obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o
> +obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o omap-usb-tll.o
> obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o
> obj-$(CONFIG_MFD_PM8XXX_IRQ) += pm8xxx-irq.o
> obj-$(CONFIG_TPS65911_COMPARATOR) += tps65911-comparator.o
> diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
> new file mode 100644
> index 0000000..3da468a
> --- /dev/null
> +++ b/drivers/mfd/omap-usb-tll.c
> @@ -0,0 +1,463 @@
> +/**
> + * omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
> + *
> + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
Nitpick : 2012
> + * Author: Keshava Munegowda <[email protected]>
> + *
> + * 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/>.
> + */
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/types.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/err.h>
> +#include <plat/usb.h>
> +#include <linux/pm_runtime.h>
> +
> +#define USBTLL_DRIVER_NAME "usbhs_tll"
> +
> +/* TLL Register Set */
> +#define OMAP_USBTLL_REVISION (0x00)
> +#define OMAP_USBTLL_SYSCONFIG (0x10)
> +#define OMAP_USBTLL_SYSCONFIG_CACTIVITY (1 << 8)
> +#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_AUTOIDLE (1 << 0)
> +
> +#define OMAP_USBTLL_SYSSTATUS (0x14)
> +#define OMAP_USBTLL_SYSSTATUS_RESETDONE (1 << 0)
> +
> +#define OMAP_USBTLL_IRQSTATUS (0x18)
> +#define OMAP_USBTLL_IRQENABLE (0x1C)
> +
> +#define OMAP_TLL_SHARED_CONF (0x30)
> +#define OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN (1 << 6)
> +#define OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN (1 << 5)
> +#define OMAP_TLL_SHARED_CONF_USB_DIVRATION (1 << 2)
> +#define OMAP_TLL_SHARED_CONF_FCLK_REQ (1 << 1)
> +#define OMAP_TLL_SHARED_CONF_FCLK_IS_ON (1 << 0)
> +
> +#define OMAP_TLL_CHANNEL_CONF(num) (0x040 + 0x004
> * num)
> +#define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT 24
> +#define OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF (1 << 11)
> +#define OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE (1 << 10)
> +#define OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE (1 << 9)
> +#define OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE (1 << 8)
> +#define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS (1 << 1)
> +#define OMAP_TLL_CHANNEL_CONF_CHANEN (1 << 0)
> +
> +#define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0 0x0
> +#define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM 0x1
> +#define OMAP_TLL_FSLSMODE_3PIN_PHY 0x2
> +#define OMAP_TLL_FSLSMODE_4PIN_PHY 0x3
> +#define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0 0x4
> +#define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM 0x5
> +#define OMAP_TLL_FSLSMODE_3PIN_TLL 0x6
> +#define OMAP_TLL_FSLSMODE_4PIN_TLL 0x7
> +#define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0 0xA
> +#define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM 0xB
> +
> +#define OMAP_TLL_ULPI_FUNCTION_CTRL(num) (0x804 + 0x100
> * num)
> +#define OMAP_TLL_ULPI_INTERFACE_CTRL(num) (0x807 + 0x100
> * num)
> +#define OMAP_TLL_ULPI_OTG_CTRL(num) (0x80A + 0x100
> * num)
> +#define OMAP_TLL_ULPI_INT_EN_RISE(num) (0x80D + 0x100
> * num)
> +#define OMAP_TLL_ULPI_INT_EN_FALL(num) (0x810 + 0x100
> * num)
> +#define OMAP_TLL_ULPI_INT_STATUS(num) (0x813 + 0x100
> * num)
> +#define OMAP_TLL_ULPI_INT_LATCH(num) (0x814 + 0x100
> * num)
> +#define OMAP_TLL_ULPI_DEBUG(num) (0x815 + 0x100
> * num)
> +#define OMAP_TLL_ULPI_SCRATCH_REGISTER(num) (0x816 + 0x100
> * num)
> +
> +#define OMAP_REV2_TLL_CHANNEL_COUNT 2
> +#define OMAP_TLL_CHANNEL_COUNT 3
> +#define OMAP_TLL_CHANNEL_1_EN_MASK (1 << 0)
> +#define OMAP_TLL_CHANNEL_2_EN_MASK (1 << 1)
> +#define OMAP_TLL_CHANNEL_3_EN_MASK (1 << 2)
> +
> +/* Values of USBTLL_REVISION - Note: these are not given in the TRM */
How are these values found? experimentally ?
> +#define OMAP_USBTLL_REV1 0x00000015 /* OMAP3 */
> +#define OMAP_USBTLL_REV2 0x00000004 /* OMAP4 */
> +
<snip>
+ else if (ver == OMAP_USBTLL_REV2)
+ count = OMAP_REV2_TLL_CHANNEL_COUNT;
+ else {
+ dev_err(dev, "TLL version failed\n");
+ ret = -ENODEV;
+ goto err_ioremap;
+ }
<Snip>
> +
> +err_ioremap:
> + spin_unlock_irqrestore(&tll->lock, flags);
> + iounmap(base);
> + pm_runtime_put_sync(dev);
> + tll_pdev = pdev;
> + if (!ret)
> + goto end;
Did not understand this check as ret is made -ENODEV so this is always true?
Am I missing something?
> + pm_runtime_disable(dev);
> +
> +err_usbtll_p2_fck:
> + clk_put(tll->usbtll_p2_fck);
> +
> +err_usbtll_p1_fck:
> + clk_put(tll->usbtll_p1_fck);
> +
> +err_tll:
> + kfree(tll);
> +
> +end:
> + return ret;
> +}
> +
> +/**
> + * usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
> + * @pdev: USB Host Controller being removed
> + *
> + * Reverses the effect of usbtll_omap_probe().
> + */
> +static int __devexit usbtll_omap_remove(struct platform_device *pdev)
> +{
> + struct usbtll_omap *tll = platform_get_drvdata(pdev);
> +
> + clk_put(tll->usbtll_p2_fck);
> + clk_put(tll->usbtll_p1_fck);
> + pm_runtime_disable(&pdev->dev);
> + kfree(tll);
> + return 0;
> +}
> +
> +static int usbtll_runtime_resume(struct device *dev)
> +{
> + struct usbtll_omap *tll = dev_get_drvdata(dev);
> + struct usbtll_omap_platform_data *pdata = &tll->platdata;
> + unsigned long flags;
> +
> + dev_dbg(dev, "usbtll_runtime_resume\n");
> +
> + if (!pdata) {
> + dev_dbg(dev, "missing platform_data\n");
> + return -ENODEV;
> + }
> +
> + spin_lock_irqsave(&tll->lock, flags);
> +
> + if (is_ehci_tll_mode(pdata->port_mode[0]))
> + clk_enable(tll->usbtll_p1_fck);
> +
> + if (is_ehci_tll_mode(pdata->port_mode[1]))
> + clk_enable(tll->usbtll_p2_fck);
> +
> + spin_unlock_irqrestore(&tll->lock, flags);
> +
> + return 0;
> +}
> +
> +static int usbtll_runtime_suspend(struct device *dev)
> +{
> + struct usbtll_omap *tll = dev_get_drvdata(dev);
> + struct usbtll_omap_platform_data *pdata = &tll->platdata;
> + unsigned long flags;
> +
> + dev_dbg(dev, "usbtll_runtime_suspend\n");
> +
> + if (!pdata) {
> + dev_dbg(dev, "missing platform_data\n");
> + return -ENODEV;
> + }
> +
> + spin_lock_irqsave(&tll->lock, flags);
> +
> + if (is_ehci_tll_mode(pdata->port_mode[0]))
> + clk_disable(tll->usbtll_p1_fck);
> +
> + if (is_ehci_tll_mode(pdata->port_mode[1]))
> + clk_disable(tll->usbtll_p2_fck);
> +
> + spin_unlock_irqrestore(&tll->lock, flags);
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops usbtllomap_dev_pm_ops = {
> + .runtime_suspend = usbtll_runtime_suspend,
> + .runtime_resume = usbtll_runtime_resume,
> +};
> +
Also how about using runtime_pm_ops ?
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
