[PATCH v2 1/2] ARM: EXYNOS: Add USB HOST register definitions

[PATCH v2 1/2] ARM: EXYNOS: Add USB HOST register definitions

[Jingoo Han]

This patch adds USB HOST register definitions. The definition for
EHCI INSNREG00 regiser and corresponding bit field definitions are
added.

Signed-off-by: Sangwook Lee <sangwook.lee@linaro.org>
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
---
v2: change the definition name from EHCI_ENA_xxx to EHCI_INSNREG00_ENA_xxx.

arch/arm/mach-exynos/include/mach/regs-usb-host.h |   24 +++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-exynos/include/mach/regs-usb-host.h

diff --git a/arch/arm/mach-exynos/include/mach/regs-usb-host.h b/arch/arm/mach-exynos/include/mach/regs-usb-host.h
new file mode 100644
index 0000000..572b7d4
--- /dev/null
+++ b/arch/arm/mach-exynos/include/mach/regs-usb-host.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ *		http://www.samsung.com
+ *
+ * EXYNOS - USB HOST register definitions
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __REGS_USB_HOST_H
+#define __REGS_USB_HOST_H __FILE__
+
+#define EHCI_INSNREG00(base)			(base + 0x90)
+#define EHCI_INSNREG00_ENA_INCR16		(0x1 << 25)
+#define EHCI_INSNREG00_ENA_INCR8		(0x1 << 24)
+#define EHCI_INSNREG00_ENA_INCR4		(0x1 << 23)
+#define EHCI_INSNREG00_ENA_INCRX_ALIGN		(0x1 << 22)
+#define EHCI_INSNREG00_ENABLE_DMA_BURST	\
+	(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 |	\
+	 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
+
+#endif /* __REGS_USB_HOST_H */
-- 
1.7.1

[PATCH v2 1/2] ARM: EXYNOS: Add USB HOST register definitions

[Heiko Stübner]

Am Donnerstag, 1. M?rz 2012, 06:38:20 schrieb Jingoo Han:
> This patch adds USB HOST register definitions. The definition for
> EHCI INSNREG00 regiser and corresponding bit field definitions are
> added.
> 
> Signed-off-by: Sangwook Lee <sangwook.lee@linaro.org>
> Signed-off-by: Jingoo Han <jg1.han@samsung.com>
> ---
> v2: change the definition name from EHCI_ENA_xxx to EHCI_INSNREG00_ENA_xxx.
> 
> arch/arm/mach-exynos/include/mach/regs-usb-host.h |   24
> +++++++++++++++++++++ 1 files changed, 24 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/mach-exynos/include/mach/regs-usb-host.h
Isn't the general idea to depopulate the mach directories and make drivers 
buildable across architectures?

The definitions are only used in drivers/usb/host/ehci-s5p.c [in the second 
patch], so there should be no need to add another arch-header and they could 
simply be included in the driver itself or if necessary a 
drivers/usb/host/ehci-s5p.h .


Heiko

> diff --git a/arch/arm/mach-exynos/include/mach/regs-usb-host.h
> b/arch/arm/mach-exynos/include/mach/regs-usb-host.h new file mode 100644
> index 0000000..572b7d4
> --- /dev/null
> +++ b/arch/arm/mach-exynos/include/mach/regs-usb-host.h
> @@ -0,0 +1,24 @@
> +/*
> + * Copyright (C) 2012 Samsung Electronics Co.Ltd
> + *		http://www.samsung.com
> + *
> + * EXYNOS - USB HOST register definitions
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef __REGS_USB_HOST_H
> +#define __REGS_USB_HOST_H __FILE__
> +
> +#define EHCI_INSNREG00(base)			(base + 0x90)
> +#define EHCI_INSNREG00_ENA_INCR16		(0x1 << 25)
> +#define EHCI_INSNREG00_ENA_INCR8		(0x1 << 24)
> +#define EHCI_INSNREG00_ENA_INCR4		(0x1 << 23)
> +#define EHCI_INSNREG00_ENA_INCRX_ALIGN		(0x1 << 22)
> +#define EHCI_INSNREG00_ENABLE_DMA_BURST	\
> +	(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 |	\
> +	 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
> +
> +#endif /* __REGS_USB_HOST_H */

[PATCH v2 1/2] ARM: EXYNOS: Add USB HOST register definitions

[Heiko Stübner]

Am Donnerstag 01 M?rz 2012, 17:10:52 schrieb Sangwook Lee:
> On 1 March 2012 15:24, Heiko St?bner <heiko@sntech.de> wrote:
> > Am Donnerstag, 1. M?rz 2012, 06:38:20 schrieb Jingoo Han:
> > > This patch adds USB HOST register definitions. The definition for
> > > EHCI INSNREG00 regiser and corresponding bit field definitions are
> > > added.
> > > 
> > > Signed-off-by: Sangwook Lee <sangwook.lee@linaro.org>
> > > Signed-off-by: Jingoo Han <jg1.han@samsung.com>
> > > ---
> > > v2: change the definition name from EHCI_ENA_xxx to
> > 
> > EHCI_INSNREG00_ENA_xxx.
> > 
> > > arch/arm/mach-exynos/include/mach/regs-usb-host.h |   24
> > > +++++++++++++++++++++ 1 files changed, 24 insertions(+), 0 deletions(-)
> > > 
> > >  create mode 100644 arch/arm/mach-exynos/include/mach/regs-usb-host.h
> > 
> > Isn't the general idea to depopulate the mach directories and make
> > drivers buildable across architectures?
> > 
> > The definitions are only used in drivers/usb/host/ehci-s5p.c [in the
> > second patch], so there should be no need to add another arch-header and
> > they could
> > simply be included in the driver itself or if necessary a
> > drivers/usb/host/ehci-s5p.h .
> 
>  I found out some code related to this burst function.
> 
>  the snip from ehci-s5pv210.c, 2.6.35 kernel
> 
>         /* Mark hardware accessible again as we are out of D3 state by now
> */
>         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
> #if defined(CONFIG_ARCH_S5PV210) || defined(CONFIG_ARCH_S5P6450)
>         ehci_writel(ehci, 0x000F0000, (void __iomem *)ehci->caps + 0x90);
> #endif
> 
> #if defined(CONFIG_ARCH_S5PV310)
>         ehci_writel(ehci, 0x03C00000, (void __iomem *)ehci->caps + 0x90);
> #endif
>         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
> 
> From this code, this burst function seems to be depending on CPUs,
> The driver by itself is not good idea because echi-s5p.c will have defined.

The current driver in mainline does not contain these ifdefs and this also 
should not change. What would happen in the code above if ARCH_S5PV210 and 
ARCH_S5PV310 are selected?

As providing support for more than one SoC in a kernel image is one of the 
current targets, architecture dependant stuff like the code above should 
probably be detected at runtime and definitly not compile-time.

> Which is the better place to pus this CPU specific definition either
> drivers/usb/host/ehci-s5p.h is
> or mach/xx.h or  include/linux/usb/xxx.h ?  I am not clear about this.

As I understand it, drivers should be compileable even if the underlying 
architecture is not selected and hence mustn't depend on architecure code.

Use-cases are for example compile-testing all usb-host drivers at once during 
some sort of rework, or the multi-arch kernel mentioned above.

But I really do not see why these defines you're adding cannot simply live 
inside the ehci-s5p.c . For example take a look at 
drivers/usb/gadget/s3c-hsudc.c . This driver also contains its private defines 
without the need for another header.


> > > diff --git a/arch/arm/mach-exynos/include/mach/regs-usb-host.h
> > > b/arch/arm/mach-exynos/include/mach/regs-usb-host.h new file mode
> > > 100644 index 0000000..572b7d4
> > > --- /dev/null
> > > +++ b/arch/arm/mach-exynos/include/mach/regs-usb-host.h
> > > @@ -0,0 +1,24 @@
> > > +/*
> > > + * Copyright (C) 2012 Samsung Electronics Co.Ltd
> > > + *           http://www.samsung.com
> > > + *
> > > + * EXYNOS - USB HOST register definitions
> > > + *
> > > + * This program is free software; you can redistribute it and/or
> > > modify + * it under the terms of the GNU General Public License
> > > version 2 as + * published by the Free Software Foundation.
> > > + */
> > > +
> > > +#ifndef __REGS_USB_HOST_H
> > > +#define __REGS_USB_HOST_H __FILE__
> > > +
> > > +#define EHCI_INSNREG00(base)                 (base + 0x90)
> > > +#define EHCI_INSNREG00_ENA_INCR16            (0x1 << 25)
> > > +#define EHCI_INSNREG00_ENA_INCR8             (0x1 << 24)
> > > +#define EHCI_INSNREG00_ENA_INCR4             (0x1 << 23)
> > > +#define EHCI_INSNREG00_ENA_INCRX_ALIGN               (0x1 << 22)
> > > +#define EHCI_INSNREG00_ENABLE_DMA_BURST      \
> > > +     (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
> > > +      EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
> > > +
> > > +#endif /* __REGS_USB_HOST_H */
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe
> > linux-samsung-soc" in
> > the body of a message to majordomo at vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html

[PATCH v2 1/2] ARM: EXYNOS: Add USB HOST register definitions

[Thomas Abraham]

On 1 March 2012 21:40, Sangwook Lee <sangwook.lee@linaro.org> wrote:
[...]

> ?I found out some code related to this burst function.
>
> ?the snip from ehci-s5pv210.c, 2.6.35 kernel
>
> ??????? /* Mark hardware accessible again as we are out of D3 state by now
> */
> ??????? set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
> #if defined(CONFIG_ARCH_S5PV210) || defined(CONFIG_ARCH_S5P6450)
> ??????? ehci_writel(ehci, 0x000F0000, (void __iomem *)ehci->caps + 0x90);
> #endif
>
> #if defined(CONFIG_ARCH_S5PV310)
> ??????? ehci_writel(ehci, 0x03C00000, (void __iomem *)ehci->caps + 0x90);
> #endif
> ??????? if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
>
> From this code, this burst function seems to be depending on CPUs,
> The driver by itself is not good idea because echi-s5p.c will have defined.
>
> Which is the better place to pus this CPU specific definition either
> drivers/usb/host/ehci-s5p.h is
> or mach/xx.h or? include/linux/usb/xxx.h ?? I am not clear about this.

Any configuration that is controller specific should be in the driver.
If that configuration has a SoC specific behavior, a id_table can be
provided to the platform_driver which can provide any SoC specific
information. The samsung keypad driver is an example of how this can
be handled (drivers/input/keyboard/samsung.c).

Thanks,
Thomas.

[PATCH v2 1/2] ARM: EXYNOS: Add USB HOST register definitions

[Jingoo Han]

> -----Original Message-----
> From: Heiko Stubner
> Sent: Friday, March 02, 2012 12:24 AM
> To: linux-arm-kernel at lists.infradead.org
> Cc: Jingoo Han; linux-usb at vger.kernel.org; linux-samsung-soc at vger.kernel.org; 'Kukjin Kim'; linaro-
> dev at lists.linaro.org; 'Joonyoung Shim'; patches at linaro.org; 'Greg Kroah-Hartman'; 'Sangwook Lee'; 'Alan
> Stern'; 'Thomas Abraham'
> Subject: Re: [PATCH v2 1/2] ARM: EXYNOS: Add USB HOST register definitions
> 
> Am Donnerstag, 1. M?rz 2012, 06:38:20 schrieb Jingoo Han:
> > This patch adds USB HOST register definitions. The definition for
> > EHCI INSNREG00 regiser and corresponding bit field definitions are
> > added.
> >
> > Signed-off-by: Sangwook Lee <sangwook.lee@linaro.org>
> > Signed-off-by: Jingoo Han <jg1.han@samsung.com>
> > ---
> > v2: change the definition name from EHCI_ENA_xxx to EHCI_INSNREG00_ENA_xxx.
> >
> > arch/arm/mach-exynos/include/mach/regs-usb-host.h |   24
> > +++++++++++++++++++++ 1 files changed, 24 insertions(+), 0 deletions(-)
> >  create mode 100644 arch/arm/mach-exynos/include/mach/regs-usb-host.h
> Isn't the general idea to depopulate the mach directories and make drivers
> buildable across architectures?
> 
> The definitions are only used in drivers/usb/host/ehci-s5p.c [in the second
> patch], so there should be no need to add another arch-header and they could
> simply be included in the driver itself or if necessary a
> drivers/usb/host/ehci-s5p.h 
Hi, Heiko St?bner.

OK, I will move the register definitions from arch/arm/mach-exynos/include/mach to
drivers/usb/host/ehci-s5p.c.

Thank you for your suggestion.

> 
> 
> Heiko
> 
> > diff --git a/arch/arm/mach-exynos/include/mach/regs-usb-host.h
> > b/arch/arm/mach-exynos/include/mach/regs-usb-host.h new file mode 100644
> > index 0000000..572b7d4
> > --- /dev/null
> > +++ b/arch/arm/mach-exynos/include/mach/regs-usb-host.h
> > @@ -0,0 +1,24 @@
> > +/*
> > + * Copyright (C) 2012 Samsung Electronics Co.Ltd
> > + *		http://www.samsung.com
> > + *
> > + * EXYNOS - USB HOST register definitions
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
> > +
> > +#ifndef __REGS_USB_HOST_H
> > +#define __REGS_USB_HOST_H __FILE__
> > +
> > +#define EHCI_INSNREG00(base)			(base + 0x90)
> > +#define EHCI_INSNREG00_ENA_INCR16		(0x1 << 25)
> > +#define EHCI_INSNREG00_ENA_INCR8		(0x1 << 24)
> > +#define EHCI_INSNREG00_ENA_INCR4		(0x1 << 23)
> > +#define EHCI_INSNREG00_ENA_INCRX_ALIGN		(0x1 << 22)
> > +#define EHCI_INSNREG00_ENABLE_DMA_BURST	\
> > +	(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 |	\
> > +	 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
> > +
> > +#endif /* __REGS_USB_HOST_H */
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo at vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html