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Date:   Fri, 18 Sep 2020 08:49:33 +0300
From:   Tony Lindgren <tony@atomide.com>
To:     Christoph Hellwig <hch@lst.de>
Cc:     Russell King <linux@armlinux.org.uk>,
        Aaro Koskinen <aaro.koskinen@iki.fi>,
        Robin Murphy <robin.murphy@arm.com>,
        iommu@lists.linux-foundation.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-omap@vger.kernel.org, linux-usb@vger.kernel.org,
        Janusz Krzysztofik <jmkrzyszt@gmail.com>
Subject: Re: [PATCH 1/4] ARM/omap1: switch to use dma_direct_set_offset for
 lbus DMA offsets
Message-ID: <20200918054933.GK7101@atomide.com>
References: <20200917173229.3311382-1-hch@lst.de>
 <20200917173229.3311382-2-hch@lst.de>
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In-Reply-To: <20200917173229.3311382-2-hch@lst.de>
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* Christoph Hellwig <hch@lst.de> [200917 17:37]:
> Switch the omap1510 platform ohci device to use dma_direct_set_offset
> to set the DMA offset instead of using direct hooks into the DMA
> mapping code and remove the now unused hooks.

Looks nice to me :) I still can't test this probably for few more weeks
though but hopefully Aaro or Janusz (Added to Cc) can test it.

Regards,

Tony

> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  arch/arm/include/asm/dma-direct.h         | 18 -------------
>  arch/arm/mach-omap1/include/mach/memory.h | 31 -----------------------
>  arch/arm/mach-omap1/usb.c                 | 22 ++++++++++++++++
>  3 files changed, 22 insertions(+), 49 deletions(-)
> 
> diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h
> index 436544aeb83405..77fcb7ee5ec907 100644
> --- a/arch/arm/include/asm/dma-direct.h
> +++ b/arch/arm/include/asm/dma-direct.h
> @@ -9,7 +9,6 @@
>   * functions used internally by the DMA-mapping API to provide DMA
>   * addresses. They must not be used by drivers.
>   */
> -#ifndef __arch_pfn_to_dma
>  static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
>  {
>  	if (dev && dev->dma_range_map)
> @@ -34,23 +33,6 @@ static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
>  	return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
>  }
>  
> -#else
> -static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
> -{
> -	return __arch_pfn_to_dma(dev, pfn);
> -}
> -
> -static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
> -{
> -	return __arch_dma_to_pfn(dev, addr);
> -}
> -
> -static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
> -{
> -	return __arch_virt_to_dma(dev, addr);
> -}
> -#endif
> -
>  static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
>  {
>  	unsigned int offset = paddr & ~PAGE_MASK;
> diff --git a/arch/arm/mach-omap1/include/mach/memory.h b/arch/arm/mach-omap1/include/mach/memory.h
> index 1142560e0078f5..36bc0000cb6ab8 100644
> --- a/arch/arm/mach-omap1/include/mach/memory.h
> +++ b/arch/arm/mach-omap1/include/mach/memory.h
> @@ -14,42 +14,11 @@
>   * OMAP-1510 bus address is translated into a Local Bus address if the
>   * OMAP bus type is lbus. We do the address translation based on the
>   * device overriding the defaults used in the dma-mapping API.
> - * Note that the is_lbus_device() test is not very efficient on 1510
> - * because of the strncmp().
>   */
> -#if defined(CONFIG_ARCH_OMAP15XX) && !defined(__ASSEMBLER__)
>  
>  /*
>   * OMAP-1510 Local Bus address offset
>   */
>  #define OMAP1510_LB_OFFSET	UL(0x30000000)
>  
> -#define virt_to_lbus(x)		((x) - PAGE_OFFSET + OMAP1510_LB_OFFSET)
> -#define lbus_to_virt(x)		((x) - OMAP1510_LB_OFFSET + PAGE_OFFSET)
> -#define is_lbus_device(dev)	(cpu_is_omap15xx() && dev && (strncmp(dev_name(dev), "ohci", 4) == 0))
> -
> -#define __arch_pfn_to_dma(dev, pfn)	\
> -	({ dma_addr_t __dma = __pfn_to_phys(pfn); \
> -	   if (is_lbus_device(dev)) \
> -		__dma = __dma - PHYS_OFFSET + OMAP1510_LB_OFFSET; \
> -	   __dma; })
> -
> -#define __arch_dma_to_pfn(dev, addr)	\
> -	({ dma_addr_t __dma = addr;				\
> -	   if (is_lbus_device(dev))				\
> -		__dma += PHYS_OFFSET - OMAP1510_LB_OFFSET;	\
> -	   __phys_to_pfn(__dma);				\
> -	})
> -
> -#define __arch_dma_to_virt(dev, addr)	({ (void *) (is_lbus_device(dev) ? \
> -						lbus_to_virt(addr) : \
> -						__phys_to_virt(addr)); })
> -
> -#define __arch_virt_to_dma(dev, addr)	({ unsigned long __addr = (unsigned long)(addr); \
> -					   (dma_addr_t) (is_lbus_device(dev) ? \
> -						virt_to_lbus(__addr) : \
> -						__virt_to_phys(__addr)); })
> -
> -#endif	/* CONFIG_ARCH_OMAP15XX */
> -
>  #endif
> diff --git a/arch/arm/mach-omap1/usb.c b/arch/arm/mach-omap1/usb.c
> index d8e9bbda8f7bdd..ba8566204ea9f4 100644
> --- a/arch/arm/mach-omap1/usb.c
> +++ b/arch/arm/mach-omap1/usb.c
> @@ -9,6 +9,7 @@
>  #include <linux/kernel.h>
>  #include <linux/init.h>
>  #include <linux/platform_device.h>
> +#include <linux/dma-mapping.h>
>  #include <linux/io.h>
>  
>  #include <asm/irq.h>
> @@ -542,6 +543,25 @@ static u32 __init omap1_usb2_init(unsigned nwires, unsigned alt_pingroup)
>  /* ULPD_APLL_CTRL */
>  #define APLL_NDPLL_SWITCH	(1 << 0)
>  
> +static int omap_1510_usb_ohci_notifier(struct notifier_block *nb,
> +		unsigned long event, void *data)
> +{
> +	struct device *dev = data;
> +
> +	if (event != BUS_NOTIFY_ADD_DEVICE)
> +		return NOTIFY_DONE;
> +
> +	if (strncmp(dev_name(dev), "ohci", 4) == 0 &&
> +	    dma_direct_set_offset(dev, PHYS_OFFSET, OMAP1510_LB_OFFSET,
> +			(u64)-1))
> +		WARN_ONCE(1, "failed to set DMA offset\n");
> +	return NOTIFY_OK;
> +}
> +
> +static struct notifier_block omap_1510_usb_ohci_nb = {
> +	.notifier_call		= omap_1510_usb_ohci_notifier,
> +};
> +
>  static void __init omap_1510_usb_init(struct omap_usb_config *config)
>  {
>  	unsigned int val;
> @@ -600,6 +620,8 @@ static void __init omap_1510_usb_init(struct omap_usb_config *config)
>  	if (config->register_host) {
>  		int status;
>  
> +		bus_register_notifier(&platform_bus_type,
> +				      &omap_1510_usb_ohci_nb);
>  		ohci_device.dev.platform_data = config;
>  		status = platform_device_register(&ohci_device);
>  		if (status)
> -- 
> 2.28.0
>