Re: [PATCH 1/4] ARM/omap1: switch to use dma_direct_set_offset for lbus DMA offsets

Tony Lindgren
2020-09-18T05:55:26Z

* 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
>