[PATCH 1/3] MIPS: add hook for platforms to register CMA memory

[PATCH 1/3] MIPS: add hook for platforms to register CMA memory

[Manuel Lauss]

Add a hook which is called after MIPS CMA memory reservation
to allow platforms to register device-specific CMA areas.
I'm going to use this for the Au1200/Au1300 framebuffer initially.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
---
Tested on Db1200/Db1300 and Db1500.  I found that this is the only
place in the initcall-chain where allocating CMA memory for devices
is actually possible on MIPS/Alchemy.

 arch/mips/include/asm/bootinfo.h | 5 +++++
 arch/mips/kernel/setup.c         | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h
index b603804..1fc1f67 100644
--- a/arch/mips/include/asm/bootinfo.h
+++ b/arch/mips/include/asm/bootinfo.h
@@ -132,6 +132,11 @@ extern unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
  */
 extern void plat_mem_setup(void);
 
+/*
+ * optional hook to reserve CMA memory for devices
+ */
+extern void (*plat_reserve_mem)(void);
+
 #ifdef CONFIG_SWIOTLB
 /*
  * Optional platform hook to call swiotlb_setup().
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 35b8316..2b56885 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -71,6 +71,8 @@ char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 #endif
 
+void (*plat_reserve_mem)(void) __initdata = NULL;
+
 /*
  * mips_io_port_base is the begin of the address space to which x86 style
  * I/O ports are mapped.
@@ -678,7 +680,12 @@ static void __init arch_mem_init(char **cmdline_p)
 	plat_swiotlb_setup();
 	paging_init();
 
+	/* allocate default CMA area */
 	dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
+	/* allow platforms to reserve CMA memory for devices */
+	if (plat_reserve_mem)
+		plat_reserve_mem();
+
 	/* Tell bootmem about cma reserved memblock section */
 	for_each_memblock(reserved, reg)
 		if (reg->size != 0)
-- 
2.5.3

[PATCH 2/3] MIPS: Alchemy: devboards: register CMA memory for Au1200 framebuffer

[Manuel Lauss]

Use the newly introduced CMA memory setup hook to register a few
megabytes for the Au1200/Au1300 framebuffer.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
---
Tested on Db1200 and Db1300.

 arch/mips/alchemy/devboards/db1200.c | 62 +++++++++++++++++++++++-------------
 arch/mips/alchemy/devboards/db1300.c | 13 ++++++++
 2 files changed, 52 insertions(+), 23 deletions(-)

diff --git a/arch/mips/alchemy/devboards/db1200.c b/arch/mips/alchemy/devboards/db1200.c
index bfc2797..eb46676 100644
--- a/arch/mips/alchemy/devboards/db1200.c
+++ b/arch/mips/alchemy/devboards/db1200.c
@@ -19,6 +19,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/dma-contiguous.h>
 #include <linux/dma-mapping.h>
 #include <linux/gpio.h>
 #include <linux/i2c.h>
@@ -37,6 +38,7 @@
 #include <linux/spi/flash.h>
 #include <linux/smc91x.h>
 #include <linux/ata_platform.h>
+#include <asm/bootinfo.h>		/* plat_reserve_mem hook */
 #include <asm/mach-au1x00/au1000.h>
 #include <asm/mach-au1x00/au1100_mmc.h>
 #include <asm/mach-au1x00/au1xxx_dbdma.h>
@@ -128,29 +130,6 @@ static int __init db1200_detect_board(void)
 	return 1;	/* it's neither */
 }
 
-int __init db1200_board_setup(void)
-{
-	unsigned short whoami;
-
-	if (db1200_detect_board())
-		return -ENODEV;
-
-	whoami = bcsr_read(BCSR_WHOAMI);
-	switch (BCSR_WHOAMI_BOARD(whoami)) {
-	case BCSR_WHOAMI_PB1200_DDR1:
-	case BCSR_WHOAMI_PB1200_DDR2:
-	case BCSR_WHOAMI_DB1200:
-		break;
-	default:
-		return -ENODEV;
-	}
-
-	printk(KERN_INFO "Alchemy/AMD/RMI %s Board, CPLD Rev %d"
-		"  Board-ID %d	Daughtercard ID %d\n", get_system_type(),
-		(whoami >> 4) & 0xf, (whoami >> 8) & 0xf, whoami & 0xf);
-
-	return 0;
-}
 
 /******************************************************************************/
 
@@ -961,3 +940,40 @@ int __init db1200_dev_setup(void)
 
 	return 0;
 }
+
+static void __init db1200_reserve_mem(void)
+{
+	int ret;
+
+	/* reserve 64MB for the framebuffer (2048x2048x32 * 4 windows) */
+	ret = dma_declare_contiguous(&au1200_lcd_dev.dev, 64 << 20, 0, 0);
+	if (ret)
+		pr_err("DB1200: failed to reserve 64MB for LCD\n");
+}
+
+int __init db1200_board_setup(void)
+{
+	unsigned short whoami;
+
+	if (db1200_detect_board())
+		return -ENODEV;
+
+	whoami = bcsr_read(BCSR_WHOAMI);
+	switch (BCSR_WHOAMI_BOARD(whoami)) {
+	case BCSR_WHOAMI_PB1200_DDR1:
+	case BCSR_WHOAMI_PB1200_DDR2:
+	case BCSR_WHOAMI_DB1200:
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	printk(KERN_INFO "Alchemy/AMD/RMI %s Board, CPLD Rev %d"
+		"  Board-ID %d	Daughtercard ID %d\n", get_system_type(),
+		(whoami >> 4) & 0xf, (whoami >> 8) & 0xf, whoami & 0xf);
+
+
+	plat_reserve_mem = db1200_reserve_mem;
+
+	return 0;
+}
diff --git a/arch/mips/alchemy/devboards/db1300.c b/arch/mips/alchemy/devboards/db1300.c
index 751a1e2..a844c04 100644
--- a/arch/mips/alchemy/devboards/db1300.c
+++ b/arch/mips/alchemy/devboards/db1300.c
@@ -6,6 +6,7 @@
 
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
+#include <linux/dma-contiguous.h>
 #include <linux/gpio.h>
 #include <linux/gpio_keys.h>
 #include <linux/init.h>
@@ -23,6 +24,7 @@
 #include <linux/smsc911x.h>
 #include <linux/wm97xx.h>
 
+#include <asm/bootinfo.h>	/* plat_reserve_mem hook */
 #include <asm/mach-au1x00/au1000.h>
 #include <asm/mach-au1x00/gpio-au1300.h>
 #include <asm/mach-au1x00/au1100_mmc.h>
@@ -841,6 +843,15 @@ int __init db1300_dev_setup(void)
 	return platform_add_devices(db1300_dev, ARRAY_SIZE(db1300_dev));
 }
 
+static void __init db1300_reserve_mem(void)
+{
+	int ret;
+
+	/* reserve 64MB for the framebuffer (2048x2048x32 * 4 windows) */
+	ret = dma_declare_contiguous(&db1300_lcd_dev.dev, 64 << 20, 0, 0);
+	if (ret)
+		pr_err("DB1300: failed to reserve 64MB for LCD\n");
+}
 
 int __init db1300_board_setup(void)
 {
@@ -865,5 +876,7 @@ int __init db1300_board_setup(void)
 	alchemy_uart_enable(AU1300_UART1_PHYS_ADDR);
 	alchemy_uart_enable(AU1300_UART3_PHYS_ADDR);
 
+	plat_reserve_mem = db1300_reserve_mem;
+
 	return 0;
 }
-- 
2.5.3

[PATCH 3/3] video: fbdev: au1200fb: alloc mem from coherent pool/CMA

[Manuel Lauss]

Change framebuffer memory allocation to grab some memory from the
coherent pool, which on MIPS causes the allocator to first try
to look for CMA-reserved memory.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: linux-fbdev <linux-fbdev@vger.kernel.org>
---
Tested on Db1200 and Db1300 boards, with no issues

 drivers/video/fbdev/au1200fb.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index f9507b1..0884197 100644
--- a/drivers/video/fbdev/au1200fb.c
+++ b/drivers/video/fbdev/au1200fb.c
@@ -1647,7 +1647,6 @@ static int au1200fb_drv_probe(struct platform_device *dev)
 	struct au1200fb_device *fbdev;
 	struct au1200fb_platdata *pd;
 	struct fb_info *fbi = NULL;
-	unsigned long page;
 	int bpp, plane, ret, irq;
 
 	print_info("" DRIVER_DESC "");
@@ -1693,7 +1692,7 @@ static int au1200fb_drv_probe(struct platform_device *dev)
 		/* Allocate the framebuffer to the maximum screen size */
 		fbdev->fb_len = (win->w[plane].xres * win->w[plane].yres * bpp) / 8;
 
-		fbdev->fb_mem = dmam_alloc_noncoherent(&dev->dev,
+		fbdev->fb_mem = dmam_alloc_coherent(&dev->dev,
 				PAGE_ALIGN(fbdev->fb_len),
 				&fbdev->fb_phys, GFP_KERNEL);
 		if (!fbdev->fb_mem) {
@@ -1702,16 +1701,6 @@ static int au1200fb_drv_probe(struct platform_device *dev)
 			return -ENOMEM;
 		}
 
-		/*
-		 * Set page reserved so that mmap will work. This is necessary
-		 * since we'll be remapping normal memory.
-		 */
-		for (page = (unsigned long)fbdev->fb_phys;
-		     page < PAGE_ALIGN((unsigned long)fbdev->fb_phys +
-			     fbdev->fb_len);
-		     page += PAGE_SIZE) {
-			SetPageReserved(pfn_to_page(page >> PAGE_SHIFT)); /* LCD DMA is NOT coherent on Au1200 */
-		}
 		print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
 		print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
 
-- 
2.5.3

Re: [PATCH 1/3] MIPS: add hook for platforms to register CMA memory

[Florian Fainelli]

On 06/10/15 09:23, Manuel Lauss wrote:
> Add a hook which is called after MIPS CMA memory reservation
> to allow platforms to register device-specific CMA areas.
> I'm going to use this for the Au1200/Au1300 framebuffer initially.
> 
> Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>

Acked-by: Florian Fainelli <f.fainelli@gmail.com>

This is also useful for BMIPS_GENERIC platforms where we may need to do
custom memory reservations.

Thanks!

> ---
> Tested on Db1200/Db1300 and Db1500.  I found that this is the only
> place in the initcall-chain where allocating CMA memory for devices
> is actually possible on MIPS/Alchemy.
> 
>  arch/mips/include/asm/bootinfo.h | 5 +++++
>  arch/mips/kernel/setup.c         | 7 +++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h
> index b603804..1fc1f67 100644
> --- a/arch/mips/include/asm/bootinfo.h
> +++ b/arch/mips/include/asm/bootinfo.h
> @@ -132,6 +132,11 @@ extern unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>   */
>  extern void plat_mem_setup(void);
>  
> +/*
> + * optional hook to reserve CMA memory for devices
> + */
> +extern void (*plat_reserve_mem)(void);
> +
>  #ifdef CONFIG_SWIOTLB
>  /*
>   * Optional platform hook to call swiotlb_setup().
> diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> index 35b8316..2b56885 100644
> --- a/arch/mips/kernel/setup.c
> +++ b/arch/mips/kernel/setup.c
> @@ -71,6 +71,8 @@ char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
>  static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
>  #endif
>  
> +void (*plat_reserve_mem)(void) __initdata = NULL;
> +
>  /*
>   * mips_io_port_base is the begin of the address space to which x86 style
>   * I/O ports are mapped.
> @@ -678,7 +680,12 @@ static void __init arch_mem_init(char **cmdline_p)
>  	plat_swiotlb_setup();
>  	paging_init();
>  
> +	/* allocate default CMA area */
>  	dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
> +	/* allow platforms to reserve CMA memory for devices */
> +	if (plat_reserve_mem)
> +		plat_reserve_mem();
> +
>  	/* Tell bootmem about cma reserved memblock section */
>  	for_each_memblock(reserved, reg)
>  		if (reg->size != 0)
> 


-- 
Florian