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* [PATCH v3 0/5] ARM: footbridge: cleanups
@ 2022-09-09 20:57 Arnd Bergmann
  2022-09-09 20:57 ` [PATCH v3 1/5] ARM: footbridge: remove addin mode Arnd Bergmann
                   ` (4 more replies)
  0 siblings, 5 replies; 8+ messages in thread
From: Arnd Bergmann @ 2022-09-09 20:57 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: Arnd Bergmann, Russell King, Christoph Hellwig, Linus Walleij,
	Marc Zyngier

From: Arnd Bergmann <arnd@arndb.de>

I'm reposting the footbridge cleanup series for reference
after Marc has successfully tested it. Russell still
had concerns about the CONFIG_ISA patch, and I've tried
to capture the result of the earlier email thread but
left it in.

Russell, let me know if you still prefer me to drop
patch 4/5 instead.

     Arnd

Arnd Bergmann (5):
  ARM: footbridge: remove addin mode
  ARM: footbridge: remove leftover from personal-server
  ARM: footbridge: move isa-dma support into footbridge
  ARM: footbridge: limit CONFIG_ISA to CATS
  ARM: footbridge: remove custom DMA address handling

Changes since v2:

- update changelog text for CONFIG_ISA patch
- add patch to remove custom phys_to_dma()/dma_to_phys
- fix a build failure.

 arch/arm/Kconfig                              |  5 --
 arch/arm/include/asm/dma-direct.h             |  1 -
 arch/arm/include/asm/dma.h                    |  2 +-
 arch/arm/include/asm/hardware/dec21285.h      | 20 ++---
 arch/arm/include/asm/mach/dma.h               |  5 --
 arch/arm/include/asm/memory.h                 | 11 ---
 arch/arm/kernel/Makefile                      |  1 -
 arch/arm/mach-footbridge/Kconfig              | 31 +------
 arch/arm/mach-footbridge/Makefile             |  5 +-
 arch/arm/mach-footbridge/common.c             | 79 +-----------------
 arch/arm/mach-footbridge/dc21285.c            | 80 +++++++++----------
 .../arm/{kernel => mach-footbridge}/dma-isa.c | 11 ++-
 arch/arm/mach-footbridge/dma.c                | 58 --------------
 .../mach-footbridge/include/mach/dma-direct.h |  8 --
 .../mach-footbridge/include/mach/isa-dma.h    | 14 +---
 .../arm/mach-footbridge/include/mach/memory.h | 31 -------
 arch/arm/mach-footbridge/isa.c                | 14 ++--
 drivers/tty/serial/21285.c                    |  3 -
 18 files changed, 71 insertions(+), 308 deletions(-)
 delete mode 100644 arch/arm/include/asm/dma-direct.h
 rename arch/arm/{kernel => mach-footbridge}/dma-isa.c (95%)
 delete mode 100644 arch/arm/mach-footbridge/dma.c
 delete mode 100644 arch/arm/mach-footbridge/include/mach/dma-direct.h

-- 
2.29.2

Cc: Russell King <linux@armlinux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Marc Zyngier <maz@kernel.org>

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 8+ messages in thread
* [PATCH v3 1/5] ARM: footbridge: remove addin mode
  2022-09-09 20:57 [PATCH v3 0/5] ARM: footbridge: cleanups Arnd Bergmann
@ 2022-09-09 20:57 ` Arnd Bergmann
  2022-09-09 20:57 ` [PATCH v3 2/5] ARM: footbridge: remove leftover from personal-server Arnd Bergmann
                   ` (3 subsequent siblings)
  4 siblings, 0 replies; 8+ messages in thread
From: Arnd Bergmann @ 2022-09-09 20:57 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: Arnd Bergmann, Russell King, Christoph Hellwig, Linus Walleij,
	Marc Zyngier

From: Arnd Bergmann <arnd@arndb.de>

This does not appear to have been used in many years, we can
kill off some of the uglier code.

Among other things, it avoids a randconfig issue when both modes
are disabled:

arch/arm/mach-footbridge/common.c:149:24: error: 'ebsa285_host_io_desc' defined but not used [-Werror=unused-variable]
  149 | static struct map_desc ebsa285_host_io_desc[] __initdata = {
      |                        ^~~~~~~~~~~~~~~~~~~~
arch/arm/mach-footbridge/common.c:136:24: error: 'fb_common_io_desc' defined but not used [-Werror=unused-variable]
  136 | static struct map_desc fb_common_io_desc[] __initdata = {
      |                        ^~~~~~~~~~~~~~~~~

The recently added phys_to_dma() functions are now trivial and
could probably be removed again as a follow-up, if anyone knows
how.

Cc: Christoph Hellwig <hch@lst.de>
Tested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/include/asm/hardware/dec21285.h      | 13 ----
 arch/arm/mach-footbridge/Kconfig              | 28 +------
 arch/arm/mach-footbridge/Makefile             |  2 +-
 arch/arm/mach-footbridge/common.c             | 73 ++-----------------
 arch/arm/mach-footbridge/dc21285.c            | 61 +++++-----------
 arch/arm/mach-footbridge/dma.c                |  3 +-
 .../arm/mach-footbridge/include/mach/memory.h | 22 ------
 arch/arm/mach-footbridge/isa.c                |  3 -
 8 files changed, 30 insertions(+), 175 deletions(-)

diff --git a/arch/arm/include/asm/hardware/dec21285.h b/arch/arm/include/asm/hardware/dec21285.h
index 3f18a56a025d..eee390e8d4dc 100644
--- a/arch/arm/include/asm/hardware/dec21285.h
+++ b/arch/arm/include/asm/hardware/dec21285.h
@@ -81,19 +81,6 @@
 #define SA110_CNTL_XCSDIR(x)		((x)<<28)
 #define SA110_CNTL_PCICFN		(1 << 31)
 
-/*
- * footbridge_cfn_mode() is used when we want
- * to check whether we are the central function
- */
-#define __footbridge_cfn_mode() (*CSR_SA110_CNTL & SA110_CNTL_PCICFN)
-#if defined(CONFIG_FOOTBRIDGE_HOST) && defined(CONFIG_FOOTBRIDGE_ADDIN)
-#define footbridge_cfn_mode() __footbridge_cfn_mode()
-#elif defined(CONFIG_FOOTBRIDGE_HOST)
-#define footbridge_cfn_mode() (1)
-#else
-#define footbridge_cfn_mode() (0)
-#endif
-
 #define CSR_PCIADDR_EXTN	DC21285_IO(0x0140)
 #define CSR_PREFETCHMEMRANGE	DC21285_IO(0x0144)
 #define CSR_XBUS_CYCLE		DC21285_IO(0x0148)
diff --git a/arch/arm/mach-footbridge/Kconfig b/arch/arm/mach-footbridge/Kconfig
index acc10b1caa69..3497ea8e91e3 100644
--- a/arch/arm/mach-footbridge/Kconfig
+++ b/arch/arm/mach-footbridge/Kconfig
@@ -8,31 +8,17 @@ config ARCH_CATS
 	depends on UNUSED_BOARD_FILES
 	select CLKEVT_I8253
 	select CLKSRC_I8253
-	select FOOTBRIDGE_HOST
 	select ISA
-	select ISA_DMA
 	select FORCE_PCI
 	help
 	  Say Y here if you intend to run this kernel on the CATS.
 
 	  Saying N will reduce the size of the Footbridge kernel.
 
-config ARCH_EBSA285_ADDIN
-	bool "EBSA285 (addin mode)"
-	select ARCH_EBSA285
-	select FOOTBRIDGE_ADDIN
-	help
-	  Say Y here if you intend to run this kernel on the EBSA285 card
-	  in addin mode.
-
-	  Saying N will reduce the size of the Footbridge kernel.
-
 config ARCH_EBSA285_HOST
 	bool "EBSA285 (host mode)"
 	select ARCH_EBSA285
-	select FOOTBRIDGE_HOST
 	select ISA
-	select ISA_DMA
 	select ARCH_MAY_HAVE_PC_FDC
 	select FORCE_PCI
 	help
@@ -45,9 +31,7 @@ config ARCH_NETWINDER
 	bool "NetWinder"
 	select CLKEVT_I8253
 	select CLKSRC_I8253
-	select FOOTBRIDGE_HOST
 	select ISA
-	select ISA_DMA
 	select FORCE_PCI
 	help
 	  Say Y here if you intend to run this kernel on the Rebel.COM
@@ -61,19 +45,11 @@ endmenu
 
 # Footbridge support
 config FOOTBRIDGE
+	def_bool y
 	select ARCH_HAS_PHYS_TO_DMA
-	bool
-
-# Footbridge in host mode
-config FOOTBRIDGE_HOST
-	bool
 	select ARCH_MIGHT_HAVE_PC_SERIO
+	select ISA_DMA
 
-# Footbridge in addin mode
-config FOOTBRIDGE_ADDIN
-	bool
-
-# EBSA285 board in either host or addin mode
 config ARCH_EBSA285
 	bool
 
diff --git a/arch/arm/mach-footbridge/Makefile b/arch/arm/mach-footbridge/Makefile
index 6262993c0555..30bae6684dce 100644
--- a/arch/arm/mach-footbridge/Makefile
+++ b/arch/arm/mach-footbridge/Makefile
@@ -9,7 +9,7 @@ obj-y			:= common.o dma.o isa-irq.o
 
 pci-y			+= dc21285.o
 pci-$(CONFIG_ARCH_CATS) += cats-pci.o
-pci-$(CONFIG_ARCH_EBSA285_HOST) += ebsa285-pci.o
+pci-$(CONFIG_ARCH_EBSA285) += ebsa285-pci.o
 pci-$(CONFIG_ARCH_NETWINDER) += netwinder-pci.o
 
 obj-$(CONFIG_ARCH_CATS) += cats-hw.o isa-timer.o
diff --git a/arch/arm/mach-footbridge/common.c b/arch/arm/mach-footbridge/common.c
index 5020eb96b025..9483eccea5ae 100644
--- a/arch/arm/mach-footbridge/common.c
+++ b/arch/arm/mach-footbridge/common.c
@@ -198,9 +198,6 @@ void __init footbridge_init_irq(void)
 
 	__fb_init_irq();
 
-	if (!footbridge_cfn_mode())
-		return;
-
 	if (machine_is_ebsa285())
 		/* The following is dependent on which slot
 		 * you plug the Southbridge card into.  We
@@ -221,21 +218,13 @@ void __init footbridge_init_irq(void)
  * commented out since there is a "No Fix" problem with it.  Not mapping
  * it means that we have extra bullet protection on our feet.
  */
-static struct map_desc fb_common_io_desc[] __initdata = {
+static struct map_desc ebsa285_host_io_desc[] __initdata = {
 	{
 		.virtual	= ARMCSR_BASE,
 		.pfn		= __phys_to_pfn(DC21285_ARMCSR_BASE),
 		.length		= ARMCSR_SIZE,
 		.type		= MT_DEVICE,
-	}
-};
-
-/*
- * The mapping when the footbridge is in host mode.  We don't map any of
- * this when we are in add-in mode.
- */
-static struct map_desc ebsa285_host_io_desc[] __initdata = {
-#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
+	},
 	{
 		.virtual	= PCIMEM_BASE,
 		.pfn		= __phys_to_pfn(DC21285_PCI_MEM),
@@ -257,26 +246,12 @@ static struct map_desc ebsa285_host_io_desc[] __initdata = {
 		.length		= PCIIACK_SIZE,
 		.type		= MT_DEVICE,
 	},
-#endif
 };
 
 void __init footbridge_map_io(void)
 {
-	/*
-	 * Set up the common mapping first; we need this to
-	 * determine whether we're in host mode or not.
-	 */
-	iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
-
-	/*
-	 * Now, work out what we've got to map in addition on this
-	 * platform.
-	 */
-	if (footbridge_cfn_mode()) {
-		iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
-		pci_map_io_early(__phys_to_pfn(DC21285_PCI_IO));
-	}
-
+	iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
+	pci_map_io_early(__phys_to_pfn(DC21285_PCI_IO));
 	vga_base = PCIMEM_BASE;
 }
 
@@ -307,48 +282,12 @@ void footbridge_restart(enum reboot_mode mode, const char *cmd)
 	}
 }
 
-#ifdef CONFIG_FOOTBRIDGE_ADDIN
-
-static inline unsigned long fb_bus_sdram_offset(void)
-{
-	return *CSR_PCISDRAMBASE & 0xfffffff0;
-}
-
-/*
- * These two functions convert virtual addresses to PCI addresses and PCI
- * addresses to virtual addresses.  Note that it is only legal to use these
- * on memory obtained via get_zeroed_page or kmalloc.
- */
-unsigned long __virt_to_bus(unsigned long res)
-{
-	WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
-
-	return res + (fb_bus_sdram_offset() - PAGE_OFFSET);
-}
-EXPORT_SYMBOL(__virt_to_bus);
-
-unsigned long __bus_to_virt(unsigned long res)
-{
-	res = res - (fb_bus_sdram_offset() - PAGE_OFFSET);
-
-	WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
-
-	return res;
-}
-EXPORT_SYMBOL(__bus_to_virt);
-#else
-static inline unsigned long fb_bus_sdram_offset(void)
-{
-	return BUS_OFFSET;
-}
-#endif /* CONFIG_FOOTBRIDGE_ADDIN */
-
 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
-	return paddr + (fb_bus_sdram_offset() - PHYS_OFFSET);
+	return paddr + (BUS_OFFSET - PHYS_OFFSET);
 }
 
 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
 {
-	return dev_addr - (fb_bus_sdram_offset() - PHYS_OFFSET);
+	return dev_addr - (BUS_OFFSET - PHYS_OFFSET);
 }
diff --git a/arch/arm/mach-footbridge/dc21285.c b/arch/arm/mach-footbridge/dc21285.c
index f9713dc561cf..372600bc15c8 100644
--- a/arch/arm/mach-footbridge/dc21285.c
+++ b/arch/arm/mach-footbridge/dc21285.c
@@ -245,9 +245,6 @@ int __init dc21285_setup(int nr, struct pci_sys_data *sys)
 {
 	struct resource *res;
 
-	if (nr || !footbridge_cfn_mode())
-		return 0;
-
 	res = kcalloc(2, sizeof(struct resource), GFP_KERNEL);
 	if (!res) {
 		printk("out of memory for root bus resources");
@@ -278,7 +275,6 @@ int __init dc21285_setup(int nr, struct pci_sys_data *sys)
 void __init dc21285_preinit(void)
 {
 	unsigned int mem_size, mem_mask;
-	int cfn_mode;
 
 	pcibios_min_mem = 0x81000000;
 
@@ -298,21 +294,15 @@ void __init dc21285_preinit(void)
 	*CSR_CSRBASEOFFSET    = 0;
 	*CSR_PCIADDR_EXTN     = 0;
 
-	cfn_mode = __footbridge_cfn_mode();
-
 	printk(KERN_INFO "PCI: DC21285 footbridge, revision %02lX, in "
-		"%s mode\n", *CSR_CLASSREV & 0xff, cfn_mode ?
-		"central function" : "addin");
-
-	if (footbridge_cfn_mode()) {
-		/*
-		 * Clear any existing errors - we aren't
-		 * interested in historical data...
-		 */
-		*CSR_SA110_CNTL	= (*CSR_SA110_CNTL & 0xffffde07) |
-				  SA110_CNTL_RXSERR;
-		*CSR_PCICMD = (*CSR_PCICMD & 0xffff) | PCICMD_ERROR_BITS;
-	}
+		"central function mode\n", *CSR_CLASSREV & 0xff);
+
+	/*
+	 * Clear any existing errors - we aren't
+	 * interested in historical data...
+	 */
+	*CSR_SA110_CNTL	= (*CSR_SA110_CNTL & 0xffffde07) | SA110_CNTL_RXSERR;
+	*CSR_PCICMD = (*CSR_PCICMD & 0xffff) | PCICMD_ERROR_BITS;
 
 	timer_setup(&serr_timer, dc21285_enable_error, 0);
 	timer_setup(&perr_timer, dc21285_enable_error, 0);
@@ -331,29 +321,18 @@ void __init dc21285_preinit(void)
 	dc21285_request_irq(IRQ_PCI_DPERR, dc21285_dparity_irq, 0,
 			    "PCI data parity", NULL);
 
-	if (cfn_mode) {
-		/*
-		 * Map our SDRAM at a known address in PCI space, just in case
-		 * the firmware had other ideas.  Using a nonzero base is
-		 * necessary, since some VGA cards forcefully use PCI addresses
-		 * in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
-		 */
-		*CSR_PCICSRBASE       = 0xf4000000;
-		*CSR_PCICSRIOBASE     = 0;
-		*CSR_PCISDRAMBASE     = __virt_to_bus(PAGE_OFFSET);
-		*CSR_PCIROMBASE       = 0;
-		*CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
-			      PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
-	} else if (footbridge_cfn_mode() != 0) {
-		/*
-		 * If we are not compiled to accept "add-in" mode, then
-		 * we are using a constant virt_to_bus translation which
-		 * can not hope to cater for the way the host BIOS  has
-		 * set up the machine.
-		 */
-		panic("PCI: this kernel is compiled for central "
-			"function mode only");
-	}
+	/*
+	 * Map our SDRAM at a known address in PCI space, just in case
+	 * the firmware had other ideas.  Using a nonzero base is
+	 * necessary, since some VGA cards forcefully use PCI addresses
+	 * in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
+	 */
+	*CSR_PCICSRBASE       = 0xf4000000;
+	*CSR_PCICSRIOBASE     = 0;
+	*CSR_PCISDRAMBASE     = __virt_to_bus(PAGE_OFFSET);
+	*CSR_PCIROMBASE       = 0;
+	*CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+		      PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
 }
 
 void __init dc21285_postinit(void)
diff --git a/arch/arm/mach-footbridge/dma.c b/arch/arm/mach-footbridge/dma.c
index 86618074a7a5..228757c8e06f 100644
--- a/arch/arm/mach-footbridge/dma.c
+++ b/arch/arm/mach-footbridge/dma.c
@@ -50,8 +50,7 @@ static int __init fb_dma_init(void)
 	dma[_DC21285_DMA(1)].d_ops = &fb_dma_ops;
 #endif
 #ifdef CONFIG_ISA_DMA
-	if (footbridge_cfn_mode())
-		isa_init_dma();
+	isa_init_dma();
 #endif
 	return 0;
 }
diff --git a/arch/arm/mach-footbridge/include/mach/memory.h b/arch/arm/mach-footbridge/include/mach/memory.h
index 3a5d2638c18f..8f0ca8e8b37e 100644
--- a/arch/arm/mach-footbridge/include/mach/memory.h
+++ b/arch/arm/mach-footbridge/include/mach/memory.h
@@ -16,22 +16,6 @@
 #ifndef __ASM_ARCH_MEMORY_H
 #define __ASM_ARCH_MEMORY_H
 
-
-#if defined(CONFIG_FOOTBRIDGE_ADDIN)
-/*
- * If we may be using add-in footbridge mode, then we must
- * use the out-of-line translation that makes use of the
- * PCI BAR
- */
-#ifndef __ASSEMBLY__
-extern unsigned long __virt_to_bus(unsigned long);
-extern unsigned long __bus_to_virt(unsigned long);
-#endif
-#define __virt_to_bus	__virt_to_bus
-#define __bus_to_virt	__bus_to_virt
-
-#elif defined(CONFIG_FOOTBRIDGE_HOST)
-
 /*
  * The footbridge is programmed to expose the system RAM at 0xe0000000.
  * The requirement is that the RAM isn't placed at bus address 0, which
@@ -41,12 +25,6 @@ extern unsigned long __bus_to_virt(unsigned long);
 #define __virt_to_bus(x)	((x) + (BUS_OFFSET - PAGE_OFFSET))
 #define __bus_to_virt(x)	((x) - (BUS_OFFSET - PAGE_OFFSET))
 
-#else
-
-#error "Undefined footbridge mode"
-
-#endif
-
 /*
  * Cache flushing area.
  */
diff --git a/arch/arm/mach-footbridge/isa.c b/arch/arm/mach-footbridge/isa.c
index ec5af521cf95..3375ac23c046 100644
--- a/arch/arm/mach-footbridge/isa.c
+++ b/arch/arm/mach-footbridge/isa.c
@@ -79,9 +79,6 @@ static int __init footbridge_isa_init(void)
 {
 	int err = 0;
 
-	if (!footbridge_cfn_mode())
-		return 0;
-
 	/* Personal server doesn't have RTC */
 	if (!machine_is_personal_server()) {
 		isa_rtc_init();
-- 
2.29.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH v3 2/5] ARM: footbridge: remove leftover from personal-server
  2022-09-09 20:57 [PATCH v3 0/5] ARM: footbridge: cleanups Arnd Bergmann
  2022-09-09 20:57 ` [PATCH v3 1/5] ARM: footbridge: remove addin mode Arnd Bergmann
@ 2022-09-09 20:57 ` Arnd Bergmann
  2022-09-09 20:57 ` [PATCH v3 3/5] ARM: footbridge: move isa-dma support into footbridge Arnd Bergmann
                   ` (2 subsequent siblings)
  4 siblings, 0 replies; 8+ messages in thread
From: Arnd Bergmann @ 2022-09-09 20:57 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: Arnd Bergmann, Russell King, Christoph Hellwig, Linus Walleij,
	Marc Zyngier

From: Arnd Bergmann <arnd@arndb.de>

The machine was removed a while ago, and the checks are
now useless.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/mach-footbridge/isa.c | 11 +++++------
 drivers/tty/serial/21285.c     |  3 ---
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mach-footbridge/isa.c b/arch/arm/mach-footbridge/isa.c
index 3375ac23c046..84caccddce44 100644
--- a/arch/arm/mach-footbridge/isa.c
+++ b/arch/arm/mach-footbridge/isa.c
@@ -80,12 +80,11 @@ static int __init footbridge_isa_init(void)
 	int err = 0;
 
 	/* Personal server doesn't have RTC */
-	if (!machine_is_personal_server()) {
-		isa_rtc_init();
-		err = platform_device_register(&rtc_device);
-		if (err)
-			printk(KERN_ERR "Unable to register RTC device: %d\n", err);
-	}
+	isa_rtc_init();
+	err = platform_device_register(&rtc_device);
+	if (err)
+		printk(KERN_ERR "Unable to register RTC device: %d\n", err);
+
 	err = platform_device_register(&serial_device);
 	if (err)
 		printk(KERN_ERR "Unable to register serial device: %d\n", err);
diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
index 7520cc02fd4d..65d6af755567 100644
--- a/drivers/tty/serial/21285.c
+++ b/drivers/tty/serial/21285.c
@@ -461,9 +461,6 @@ static int __init serial21285_console_setup(struct console *co, char *options)
 	int parity = 'n';
 	int flow = 'n';
 
-	if (machine_is_personal_server())
-		baud = 57600;
-
 	/*
 	 * Check whether an invalid uart number has been specified, and
 	 * if so, search for the first available port that does have
-- 
2.29.2


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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH v3 3/5] ARM: footbridge: move isa-dma support into footbridge
  2022-09-09 20:57 [PATCH v3 0/5] ARM: footbridge: cleanups Arnd Bergmann
  2022-09-09 20:57 ` [PATCH v3 1/5] ARM: footbridge: remove addin mode Arnd Bergmann
  2022-09-09 20:57 ` [PATCH v3 2/5] ARM: footbridge: remove leftover from personal-server Arnd Bergmann
@ 2022-09-09 20:57 ` Arnd Bergmann
  2022-09-09 20:57 ` [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS Arnd Bergmann
  2022-09-09 20:57 ` [PATCH v3 5/5] ARM: footbridge: remove custom DMA address handling Arnd Bergmann
  4 siblings, 0 replies; 8+ messages in thread
From: Arnd Bergmann @ 2022-09-09 20:57 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: Arnd Bergmann, Russell King, Christoph Hellwig, Linus Walleij,
	Marc Zyngier

From: Arnd Bergmann <arnd@arndb.de>

The dma-isa.c was shared between footbridge and shark a long time ago,
but as shark was removed, it can be made footbridge specific again.

The fb_dma bits in turn are not used at all and can be removed.

All the ISA related files are now built into the platform regardless
of CONFIG_ISA, as they just refer to on-chip devices rather than actual
ISA cards.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/Kconfig                              |  5 --
 arch/arm/include/asm/mach/dma.h               |  5 --
 arch/arm/kernel/Makefile                      |  1 -
 arch/arm/mach-footbridge/Kconfig              |  2 +-
 arch/arm/mach-footbridge/Makefile             |  3 +-
 .../arm/{kernel => mach-footbridge}/dma-isa.c |  7 ++-
 arch/arm/mach-footbridge/dma.c                | 57 -------------------
 .../mach-footbridge/include/mach/isa-dma.h    | 14 +----
 8 files changed, 9 insertions(+), 85 deletions(-)
 rename arch/arm/{kernel => mach-footbridge}/dma-isa.c (98%)
 delete mode 100644 arch/arm/mach-footbridge/dma.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 87badeae3181..ec7e48f6bd91 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -989,11 +989,6 @@ config ISA
 	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 	  newer boards don't support it.  If you have ISA, say Y, otherwise N.
 
-# Select ISA DMA controller support
-config ISA_DMA
-	bool
-	select ISA_DMA_API
-
 # Select ISA DMA interface
 config ISA_DMA_API
 	bool
diff --git a/arch/arm/include/asm/mach/dma.h b/arch/arm/include/asm/mach/dma.h
index 1506422af383..5ec11d7f0d04 100644
--- a/arch/arm/include/asm/mach/dma.h
+++ b/arch/arm/include/asm/mach/dma.h
@@ -44,8 +44,3 @@ struct dma_struct {
  * isa_dma_add - add an ISA-style DMA channel
  */
 extern int isa_dma_add(unsigned int, dma_t *dma);
-
-/*
- * Add the ISA DMA controller.  Always takes channels 0-7.
- */
-extern void isa_init_dma(void);
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 553866751e1a..95034d32213c 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -45,7 +45,6 @@ obj-$(CONFIG_ISA_DMA_API)	+= dma.o
 obj-$(CONFIG_FIQ)		+= fiq.o fiqasm.o
 obj-$(CONFIG_MODULES)		+= armksyms.o module.o
 obj-$(CONFIG_ARM_MODULE_PLTS)	+= module-plts.o
-obj-$(CONFIG_ISA_DMA)		+= dma-isa.o
 obj-$(CONFIG_PCI)		+= bios32.o isa.o
 obj-$(CONFIG_ARM_CPU_SUSPEND)	+= sleep.o suspend.o
 obj-$(CONFIG_HIBERNATION)	+= hibernate.o
diff --git a/arch/arm/mach-footbridge/Kconfig b/arch/arm/mach-footbridge/Kconfig
index 3497ea8e91e3..1a3676109654 100644
--- a/arch/arm/mach-footbridge/Kconfig
+++ b/arch/arm/mach-footbridge/Kconfig
@@ -48,7 +48,7 @@ config FOOTBRIDGE
 	def_bool y
 	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_MIGHT_HAVE_PC_SERIO
-	select ISA_DMA
+	select ISA_DMA_API
 
 config ARCH_EBSA285
 	bool
diff --git a/arch/arm/mach-footbridge/Makefile b/arch/arm/mach-footbridge/Makefile
index 30bae6684dce..55d570739f19 100644
--- a/arch/arm/mach-footbridge/Makefile
+++ b/arch/arm/mach-footbridge/Makefile
@@ -5,7 +5,7 @@
 
 # Object file lists.
 
-obj-y			:= common.o dma.o isa-irq.o
+obj-y			:= common.o isa-irq.o isa.o isa-rtc.o dma-isa.o
 
 pci-y			+= dc21285.o
 pci-$(CONFIG_ARCH_CATS) += cats-pci.o
@@ -18,4 +18,3 @@ obj-$(CONFIG_ARCH_NETWINDER) += netwinder-hw.o isa-timer.o
 
 obj-$(CONFIG_PCI)	+=$(pci-y)
 
-obj-$(CONFIG_ISA)	+= isa.o isa-rtc.o
diff --git a/arch/arm/kernel/dma-isa.c b/arch/arm/mach-footbridge/dma-isa.c
similarity index 98%
rename from arch/arm/kernel/dma-isa.c
rename to arch/arm/mach-footbridge/dma-isa.c
index 2d90ecce5a11..0fc0705fd58b 100644
--- a/arch/arm/kernel/dma-isa.c
+++ b/arch/arm/mach-footbridge/dma-isa.c
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- *  linux/arch/arm/kernel/dma-isa.c
- *
  *  Copyright (C) 1999-2000 Russell King
  *
  *  ISA DMA primitives
@@ -157,7 +155,7 @@ static dma_t isa_dma[8];
 /*
  * ISA DMA always starts at channel 0
  */
-void __init isa_init_dma(void)
+static int __init isa_dma_init(void)
 {
 	/*
 	 * Try to autodetect presence of an ISA DMA controller.
@@ -222,4 +220,7 @@ void __init isa_init_dma(void)
 
 		request_dma(DMA_ISA_CASCADE, "cascade");
 	}
+
+	return 0;
 }
+core_initcall(isa_dma_init);
diff --git a/arch/arm/mach-footbridge/dma.c b/arch/arm/mach-footbridge/dma.c
deleted file mode 100644
index 228757c8e06f..000000000000
--- a/arch/arm/mach-footbridge/dma.c
+++ /dev/null
@@ -1,57 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  linux/arch/arm/kernel/dma-ebsa285.c
- *
- *  Copyright (C) 1998 Phil Blundell
- *
- * DMA functions specific to EBSA-285/CATS architectures
- *
- *  Changelog:
- *   09-Nov-1998 RMK	Split out ISA DMA functions to dma-isa.c
- *   17-Mar-1999 RMK	Allow any EBSA285-like architecture to have
- *			ISA DMA controllers.
- */
-#include <linux/init.h>
-#include <linux/io.h>
-#include <linux/spinlock.h>
-#include <linux/scatterlist.h>
-
-#include <asm/dma.h>
-
-#include <asm/mach/dma.h>
-#include <asm/hardware/dec21285.h>
-
-#if 0
-static int fb_dma_request(unsigned int chan, dma_t *dma)
-{
-	return -EINVAL;
-}
-
-static void fb_dma_enable(unsigned int chan, dma_t *dma)
-{
-}
-
-static void fb_dma_disable(unsigned int chan, dma_t *dma)
-{
-}
-
-static struct dma_ops fb_dma_ops = {
-	.type		= "fb",
-	.request	= fb_dma_request,
-	.enable		= fb_dma_enable,
-	.disable	= fb_dma_disable,
-};
-#endif
-
-static int __init fb_dma_init(void)
-{
-#if 0
-	dma[_DC21285_DMA(0)].d_ops = &fb_dma_ops;
-	dma[_DC21285_DMA(1)].d_ops = &fb_dma_ops;
-#endif
-#ifdef CONFIG_ISA_DMA
-	isa_init_dma();
-#endif
-	return 0;
-}
-core_initcall(fb_dma_init);
diff --git a/arch/arm/mach-footbridge/include/mach/isa-dma.h b/arch/arm/mach-footbridge/include/mach/isa-dma.h
index 8a1b991076e1..b10731a1f66a 100644
--- a/arch/arm/mach-footbridge/include/mach/isa-dma.h
+++ b/arch/arm/mach-footbridge/include/mach/isa-dma.h
@@ -10,17 +10,9 @@
 #ifndef __ASM_ARCH_DMA_H
 #define __ASM_ARCH_DMA_H
 
-/*
- * The 21285 has two internal DMA channels; we call these 8 and 9.
- * On CATS hardware we have an additional eight ISA dma channels
- * numbered 0..7.
- */
-#define _ISA_DMA(x)		(0+(x))
-#define _DC21285_DMA(x)		(8+(x))
-
-#define MAX_DMA_CHANNELS	10
+#define MAX_DMA_CHANNELS	8
 
-#define DMA_FLOPPY		_ISA_DMA(2)
-#define DMA_ISA_CASCADE		_ISA_DMA(4)
+#define DMA_FLOPPY		(2)
+#define DMA_ISA_CASCADE		(4)
 
 #endif /* _ASM_ARCH_DMA_H */
-- 
2.29.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS
  2022-09-09 20:57 [PATCH v3 0/5] ARM: footbridge: cleanups Arnd Bergmann
                   ` (2 preceding siblings ...)
  2022-09-09 20:57 ` [PATCH v3 3/5] ARM: footbridge: move isa-dma support into footbridge Arnd Bergmann
@ 2022-09-09 20:57 ` Arnd Bergmann
  2022-09-11 19:53   ` Russell King (Oracle)
  2022-09-09 20:57 ` [PATCH v3 5/5] ARM: footbridge: remove custom DMA address handling Arnd Bergmann
  4 siblings, 1 reply; 8+ messages in thread
From: Arnd Bergmann @ 2022-09-09 20:57 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: Arnd Bergmann, Russell King, Christoph Hellwig, Linus Walleij,
	Marc Zyngier

From: Arnd Bergmann <arnd@arndb.de>

The CONFIG_ISA option is only used for actual add-in cards, not
on-board devices. NetWinder has no hardware support for those,
and ebsa285 appears to not support them in Linux, as the XBUS
is not set up that way and there is no support for a PCI-ISA
bridge.

CATS on the other hand has four ISA slots connected to a PCI-ISA
bridge device.

Russell mentioned that it is no longer possible to select the sound
drivers for Netwinder after this, as the WaveArtist sound chip is
connected to the ISA bus. However, the WaveArtist module was removed
years ago in linux-4.15 and did not actually depend on CONFIG_ISA.
While the SoundBlaster compatibility mode of the SoundChip might work
with the ALSA sb16-isa driver with a little help, there is no mixer
support without the waveartist driver, and the default settings for
sb16 never probe IRQ 3.

Link: https://lore.kernel.org/linux-arm-kernel/87v8q3unlv.wl-maz@kernel.org/
Tested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/mach-footbridge/Kconfig | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm/mach-footbridge/Kconfig b/arch/arm/mach-footbridge/Kconfig
index 1a3676109654..cd18871fd03f 100644
--- a/arch/arm/mach-footbridge/Kconfig
+++ b/arch/arm/mach-footbridge/Kconfig
@@ -18,7 +18,6 @@ config ARCH_CATS
 config ARCH_EBSA285_HOST
 	bool "EBSA285 (host mode)"
 	select ARCH_EBSA285
-	select ISA
 	select ARCH_MAY_HAVE_PC_FDC
 	select FORCE_PCI
 	help
@@ -31,7 +30,6 @@ config ARCH_NETWINDER
 	bool "NetWinder"
 	select CLKEVT_I8253
 	select CLKSRC_I8253
-	select ISA
 	select FORCE_PCI
 	help
 	  Say Y here if you intend to run this kernel on the Rebel.COM
-- 
2.29.2


_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH v3 5/5] ARM: footbridge: remove custom DMA address handling
  2022-09-09 20:57 [PATCH v3 0/5] ARM: footbridge: cleanups Arnd Bergmann
                   ` (3 preceding siblings ...)
  2022-09-09 20:57 ` [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS Arnd Bergmann
@ 2022-09-09 20:57 ` Arnd Bergmann
  4 siblings, 0 replies; 8+ messages in thread
From: Arnd Bergmann @ 2022-09-09 20:57 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: Arnd Bergmann, Russell King, Christoph Hellwig, Linus Walleij,
	Marc Zyngier

From: Arnd Bergmann <arnd@arndb.de>

Footbridge is the last Arm platform that has its own
__virt_to_bus()/__bus_to_virt()/phys_to_dma()/dma_to_phys() abstraction,
but this is just a simple offset now.

For PCI devices, the offset that is programmed into the PCI bridge must
also be set in each device using dma_direct_set_offset().  As Arm does
not have a pcibios_bus_add_device() helper yet, just use a bus notifier
for this.

For the ISA DMA, drivers now pass a non-translated physical address into
set_dma_addr(), so they have to be converted back with the corresponding
isa_bus_to_virt() function and then into the correct bus address with
the offset using the isa_dma_dev.

Tested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/include/asm/dma-direct.h             |  1 -
 arch/arm/include/asm/dma.h                    |  2 +-
 arch/arm/include/asm/hardware/dec21285.h      |  7 +++++++
 arch/arm/include/asm/memory.h                 | 11 ----------
 arch/arm/mach-footbridge/Kconfig              |  1 -
 arch/arm/mach-footbridge/common.c             | 10 ---------
 arch/arm/mach-footbridge/dc21285.c            | 21 ++++++++++++++++++-
 arch/arm/mach-footbridge/dma-isa.c            |  4 ++++
 .../mach-footbridge/include/mach/dma-direct.h |  8 -------
 .../arm/mach-footbridge/include/mach/memory.h |  9 --------
 10 files changed, 32 insertions(+), 42 deletions(-)
 delete mode 100644 arch/arm/include/asm/dma-direct.h
 delete mode 100644 arch/arm/mach-footbridge/include/mach/dma-direct.h

diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h
deleted file mode 100644
index 4f7bcde03abb..000000000000
--- a/arch/arm/include/asm/dma-direct.h
+++ /dev/null
@@ -1 +0,0 @@
-#include <mach/dma-direct.h>
diff --git a/arch/arm/include/asm/dma.h b/arch/arm/include/asm/dma.h
index 05f29a72150b..c6aded1b069c 100644
--- a/arch/arm/include/asm/dma.h
+++ b/arch/arm/include/asm/dma.h
@@ -106,7 +106,7 @@ extern void set_dma_sg(unsigned int chan, struct scatterlist *sg, int nr_sg);
  */
 extern void __set_dma_addr(unsigned int chan, void *addr);
 #define set_dma_addr(chan, addr)				\
-	__set_dma_addr(chan, (void *)__bus_to_virt(addr))
+	__set_dma_addr(chan, (void *)isa_bus_to_virt(addr))
 
 /* Set the DMA byte count for this channel
  *
diff --git a/arch/arm/include/asm/hardware/dec21285.h b/arch/arm/include/asm/hardware/dec21285.h
index eee390e8d4dc..894f2a635cbb 100644
--- a/arch/arm/include/asm/hardware/dec21285.h
+++ b/arch/arm/include/asm/hardware/dec21285.h
@@ -22,6 +22,13 @@
 #define DC21285_IO(x)		(x)
 #endif
 
+/*
+ * The footbridge is programmed to expose the system RAM at 0xe0000000.
+ * The requirement is that the RAM isn't placed at bus address 0, which
+ * would clash with VGA cards.
+ */
+#define BUS_OFFSET 0xe0000000
+
 #define CSR_PCICMD		DC21285_IO(0x0004)
 #define CSR_CLASSREV		DC21285_IO(0x0008)
 #define CSR_PCICACHELINESIZE	DC21285_IO(0x000c)
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index a55a9038abc8..d8eef4bd8c71 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -369,17 +369,6 @@ static inline unsigned long __virt_to_idmap(unsigned long x)
 
 #define virt_to_idmap(x)	__virt_to_idmap((unsigned long)(x))
 
-/*
- * Virtual <-> DMA view memory address translations
- * Again, these are *only* valid on the kernel direct mapped RAM
- * memory.  Use of these is *deprecated* (and that doesn't mean
- * use the __ prefixed forms instead.)  See dma-mapping.h.
- */
-#ifndef __virt_to_bus
-#define __virt_to_bus	__virt_to_phys
-#define __bus_to_virt	__phys_to_virt
-#endif
-
 /*
  * Conversion between a struct page and a physical address.
  *
diff --git a/arch/arm/mach-footbridge/Kconfig b/arch/arm/mach-footbridge/Kconfig
index cd18871fd03f..f452663576d1 100644
--- a/arch/arm/mach-footbridge/Kconfig
+++ b/arch/arm/mach-footbridge/Kconfig
@@ -44,7 +44,6 @@ endmenu
 # Footbridge support
 config FOOTBRIDGE
 	def_bool y
-	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select ISA_DMA_API
 
diff --git a/arch/arm/mach-footbridge/common.c b/arch/arm/mach-footbridge/common.c
index 9483eccea5ae..629e4676ed77 100644
--- a/arch/arm/mach-footbridge/common.c
+++ b/arch/arm/mach-footbridge/common.c
@@ -281,13 +281,3 @@ void footbridge_restart(enum reboot_mode mode, const char *cmd)
 		*CSR_SA110_CNTL |= (1 << 13);
 	}
 }
-
-dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return paddr + (BUS_OFFSET - PHYS_OFFSET);
-}
-
-phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
-{
-	return dev_addr - (BUS_OFFSET - PHYS_OFFSET);
-}
diff --git a/arch/arm/mach-footbridge/dc21285.c b/arch/arm/mach-footbridge/dc21285.c
index 372600bc15c8..f8920d0010de 100644
--- a/arch/arm/mach-footbridge/dc21285.c
+++ b/arch/arm/mach-footbridge/dc21285.c
@@ -5,6 +5,7 @@
  *  Copyright (C) 1998-2001 Russell King
  *  Copyright (C) 1998-2000 Phil Blundell
  */
+#include <linux/dma-map-ops.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
@@ -241,6 +242,22 @@ static irqreturn_t dc21285_parity_irq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static int dc21285_pci_bus_notifier(struct notifier_block *nb,
+				    unsigned long action,
+				    void *data)
+{
+	if (action != BUS_NOTIFY_ADD_DEVICE)
+		return NOTIFY_DONE;
+
+	dma_direct_set_offset(data, PHYS_OFFSET, BUS_OFFSET, SZ_256M);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block dc21285_pci_bus_nb = {
+	.notifier_call = dc21285_pci_bus_notifier,
+};
+
 int __init dc21285_setup(int nr, struct pci_sys_data *sys)
 {
 	struct resource *res;
@@ -266,6 +283,8 @@ int __init dc21285_setup(int nr, struct pci_sys_data *sys)
 	pci_add_resource_offset(&sys->resources, &res[0], sys->mem_offset);
 	pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);
 
+	bus_register_notifier(&pci_bus_type, &dc21285_pci_bus_nb);
+
 	return 1;
 }
 
@@ -329,7 +348,7 @@ void __init dc21285_preinit(void)
 	 */
 	*CSR_PCICSRBASE       = 0xf4000000;
 	*CSR_PCICSRIOBASE     = 0;
-	*CSR_PCISDRAMBASE     = __virt_to_bus(PAGE_OFFSET);
+	*CSR_PCISDRAMBASE     = BUS_OFFSET;
 	*CSR_PCIROMBASE       = 0;
 	*CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 		      PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
diff --git a/arch/arm/mach-footbridge/dma-isa.c b/arch/arm/mach-footbridge/dma-isa.c
index 0fc0705fd58b..937f5376d5e7 100644
--- a/arch/arm/mach-footbridge/dma-isa.c
+++ b/arch/arm/mach-footbridge/dma-isa.c
@@ -11,6 +11,7 @@
  *   arch/arm/kernel/dma-ebsa285.c
  *   Copyright (C) 1998 Phil Blundell
  */
+#include <linux/dma-map-ops.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/dma-mapping.h>
@@ -18,6 +19,7 @@
 
 #include <asm/dma.h>
 #include <asm/mach/dma.h>
+#include <asm/hardware/dec21285.h>
 
 #define ISA_DMA_MASK		0
 #define ISA_DMA_MODE		1
@@ -221,6 +223,8 @@ static int __init isa_dma_init(void)
 		request_dma(DMA_ISA_CASCADE, "cascade");
 	}
 
+	dma_direct_set_offset(&isa_dma_dev, PHYS_OFFSET, BUS_OFFSET, SZ_256M);
+
 	return 0;
 }
 core_initcall(isa_dma_init);
diff --git a/arch/arm/mach-footbridge/include/mach/dma-direct.h b/arch/arm/mach-footbridge/include/mach/dma-direct.h
deleted file mode 100644
index 01f9e8367c00..000000000000
--- a/arch/arm/mach-footbridge/include/mach/dma-direct.h
+++ /dev/null
@@ -1,8 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef MACH_FOOTBRIDGE_DMA_DIRECT_H
-#define MACH_FOOTBRIDGE_DMA_DIRECT_H 1
-
-dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
-phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr);
-
-#endif /* MACH_FOOTBRIDGE_DMA_DIRECT_H */
diff --git a/arch/arm/mach-footbridge/include/mach/memory.h b/arch/arm/mach-footbridge/include/mach/memory.h
index 8f0ca8e8b37e..9516877667d7 100644
--- a/arch/arm/mach-footbridge/include/mach/memory.h
+++ b/arch/arm/mach-footbridge/include/mach/memory.h
@@ -16,15 +16,6 @@
 #ifndef __ASM_ARCH_MEMORY_H
 #define __ASM_ARCH_MEMORY_H
 
-/*
- * The footbridge is programmed to expose the system RAM at 0xe0000000.
- * The requirement is that the RAM isn't placed at bus address 0, which
- * would clash with VGA cards.
- */
-#define BUS_OFFSET		0xe0000000
-#define __virt_to_bus(x)	((x) + (BUS_OFFSET - PAGE_OFFSET))
-#define __bus_to_virt(x)	((x) - (BUS_OFFSET - PAGE_OFFSET))
-
 /*
  * Cache flushing area.
  */
-- 
2.29.2


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^ permalink raw reply related	[flat|nested] 8+ messages in thread
* Re: [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS
  2022-09-09 20:57 ` [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS Arnd Bergmann
@ 2022-09-11 19:53   ` Russell King (Oracle)
  2022-09-15 14:00     ` Arnd Bergmann
  0 siblings, 1 reply; 8+ messages in thread
From: Russell King (Oracle) @ 2022-09-11 19:53 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: linux-arm-kernel, Arnd Bergmann, Christoph Hellwig, Linus Walleij,
	Marc Zyngier

On Fri, Sep 09, 2022 at 10:57:48PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The CONFIG_ISA option is only used for actual add-in cards, not
> on-board devices. NetWinder has no hardware support for those,
> and ebsa285 appears to not support them in Linux, as the XBUS
> is not set up that way and there is no support for a PCI-ISA
> bridge.

That is an incorrect assumption, but is still true as far as ISA
DMA is concerned.

The "Team" produced a PCI card with a PCI southbridge chip on, along
with ISAPNP devices. ISAPNP depends on CONFIG_ISA... That said, using
the "ESS ES1879 Plug and Play AudioDrive" on it requires ISA DMA, and
as DMA from the PCI southbridge causes the PCI bus to deadlock, it
probably doesn't matter.

However, what I'm pointing out is that the assertion that CONFIG_ISA
means ISA cards is not entirely correct with the creation of this
PCI southbridge card.

(This card gives me keyboard, mouse, serial etc ports which is its
main use in the machine.)


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^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS
  2022-09-11 19:53   ` Russell King (Oracle)
@ 2022-09-15 14:00     ` Arnd Bergmann
  0 siblings, 0 replies; 8+ messages in thread
From: Arnd Bergmann @ 2022-09-15 14:00 UTC (permalink / raw)
  To: Russell King, Arnd Bergmann
  Cc: linux-arm-kernel, Christoph Hellwig, Linus Walleij, Marc Zyngier

On Sun, Sep 11, 2022, at 9:53 PM, Russell King (Oracle) wrote:
> On Fri, Sep 09, 2022 at 10:57:48PM +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@arndb.de>
>> 
>> The CONFIG_ISA option is only used for actual add-in cards, not
>> on-board devices. NetWinder has no hardware support for those,
>> and ebsa285 appears to not support them in Linux, as the XBUS
>> is not set up that way and there is no support for a PCI-ISA
>> bridge.
>
> That is an incorrect assumption, but is still true as far as ISA
> DMA is concerned.
>
> The "Team" produced a PCI card with a PCI southbridge chip on, along
> with ISAPNP devices. ISAPNP depends on CONFIG_ISA... That said, using
> the "ESS ES1879 Plug and Play AudioDrive" on it requires ISA DMA, and
> as DMA from the PCI southbridge causes the PCI bus to deadlock, it
> probably doesn't matter.
>
> However, what I'm pointing out is that the assertion that CONFIG_ISA
> means ISA cards is not entirely correct with the creation of this
> PCI southbridge card.
>
> (This card gives me keyboard, mouse, serial etc ports which is its
> main use in the machine.)

I dropped the patch now, and queued the rest of the series for
the 6.1 merge window.

      Arnd

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^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2022-09-15 14:02 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-09-09 20:57 [PATCH v3 0/5] ARM: footbridge: cleanups Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 1/5] ARM: footbridge: remove addin mode Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 2/5] ARM: footbridge: remove leftover from personal-server Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 3/5] ARM: footbridge: move isa-dma support into footbridge Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS Arnd Bergmann
2022-09-11 19:53   ` Russell King (Oracle)
2022-09-15 14:00     ` Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 5/5] ARM: footbridge: remove custom DMA address handling Arnd Bergmann

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