Re: [PATCH V2] AT91: dt: at91sam9g45 family and board device treefiles

From: Rob Herring
Date: Wed Oct 05 2011 - 09:00:22 EST

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Nicolas,

On 10/03/2011 05:00 AM, Nicolas Ferre wrote:
> Create a new device tree source file for Atmel at91sam9g45 SoC family.
> The Evaluation Kit at91sam9m10g45ek includes it.
> This first basic support will be populated as drivers and boards will be
> converted to device tree.
> Contains serial, dma and interrupt controllers.
>
> The generic board file still takes advantage of platform data for early serial
> init. As we need a storage media and the NAND flash driver is not converted to
> DT yet, we keep old initialization for it.
>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> ---
> V2: foundation for AT91SAM generic support
> - device tree focused board file
> - inclusion of USART DT support
> - early USART and NAND still using platform data
>
> arch/arm/boot/dts/at91sam9g45.dtsi | 103 +++++++++++++++++++++++++
> arch/arm/boot/dts/at91sam9m10g45ek.dts | 37 +++++++++
> arch/arm/mach-at91/Kconfig | 11 +++
> arch/arm/mach-at91/Makefile | 3 +
> arch/arm/mach-at91/Makefile.boot | 2 +
> arch/arm/mach-at91/at91sam9g45_devices.c | 24 +++++--
> arch/arm/mach-at91/board-dt.c | 122 ++++++++++++++++++++++++++++++
> 7 files changed, 296 insertions(+), 6 deletions(-)
> create mode 100644 arch/arm/boot/dts/at91sam9g45.dtsi
> create mode 100644 arch/arm/boot/dts/at91sam9m10g45ek.dts
> create mode 100644 arch/arm/mach-at91/board-dt.c
>
> diff --git a/arch/arm/boot/dts/at91sam9g45.dtsi b/arch/arm/boot/dts/at91sam9g45.dtsi
> new file mode 100644
> index 0000000..7d3341f
> --- /dev/null
> +++ b/arch/arm/boot/dts/at91sam9g45.dtsi
> @@ -0,0 +1,103 @@
> +/*
> + * at91sam9g45.dtsi - Device Tree Include file for AT91SAM9G45 family SoC
> + * applies to AT91SAM9G45, AT91SAM9M10,
> + * AT91SAM9G46, AT91SAM9M11 SoC
> + *
> + * Copyright (C) 2011 Atmel,
> + * 2011 Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> + *
> + * Licensed under GPLv2 or later.
> + */
> +
> +/include/ "skeleton.dtsi"
> +
> +/ {
> + model = "Atmel AT91SAM9G45 family SoC";
> + compatible = "atmel,at91sam9g45";
> + interrupt-parent = <&aic>;
> +
> + aliases {
> + serial0 = &dbgu;
> + serial1 = &usart0;
> + serial2 = &usart1;
> + serial3 = &usart2;
> + serial4 = &usart3;
> + };
> + cpus {
> + cpu@0 {
> + compatible = "arm,arm926ejs";
> + };
> + };
> +
> + memory {

Should be memory@0x70000000

> + reg = <0x70000000 0x10000000>;
> + };
> +
> + ahb {
> + compatible = "simple-bus";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> +
> + apb {
> + compatible = "simple-bus";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> +
> + aic: interrupt-controller@fffff000 {
> + #interrupt-cells = <1>;
> + compatible = "atmel,at91rm9200-aic";
> + interrupt-controller;

Add "interrupt-parent;" so that the aic is not the parent of itself.

> + reg = <0xfffff000 0x200>;
> + };
> +
> + dma: dma-controller@ffffec00 {
> + compatible = "atmel,at91sam9g45-hdmac";
> + reg = <0xffffec00 0x200>;
> + interrupts = <21>;
> + atmel,hdmac-nr-channels = <8>;
> + atmel,hdmac-cap-memcpy;
> + atmel,hdmac-cap-slave;
> + };
> +
> + dbgu: serial@ffffee00 {
> + compatible = "atmel,at91sam9260-usart";
> + reg = <0xffffee00 0x200>;
> + interrupts = <1>;
> + };
> +
> + usart0: serial@fff8c000 {
> + compatible = "atmel,at91sam9260-usart";
> + reg = <0xfff8c000 0x4000>;

Is 16K really used? I would set to 4K so your not wasting virtual space
(probably not an issue yet on Atmel parts).

> + interrupts = <7>;
> + atmel,use-dma-rx;
> + atmel,use-dma-tx;
> + };
> +
> + usart1: serial@fff90000 {
> + compatible = "atmel,at91sam9260-usart";
> + reg = <0xfff90000 0x4000>;
> + interrupts = <8>;
> + atmel,use-dma-rx;
> + atmel,use-dma-tx;
> + };
> +
> + usart2: serial@fff94000 {
> + compatible = "atmel,at91sam9260-usart";
> + reg = <0xfff94000 0x4000>;
> + interrupts = <9>;
> + atmel,use-dma-rx;
> + atmel,use-dma-tx;
> + };
> +
> + usart3: serial@fff98000 {
> + compatible = "atmel,at91sam9260-usart";
> + reg = <0xfff98000 0x4000>;
> + interrupts = <10>;
> + atmel,use-dma-rx;
> + atmel,use-dma-tx;
> + };
> + };
> + };
> +};
> diff --git a/arch/arm/boot/dts/at91sam9m10g45ek.dts b/arch/arm/boot/dts/at91sam9m10g45ek.dts
> new file mode 100644
> index 0000000..cf743de
> --- /dev/null
> +++ b/arch/arm/boot/dts/at91sam9m10g45ek.dts
> @@ -0,0 +1,37 @@
> +/*
> + * at91sam9m10g45ek.dts - Device Tree file for AT91SAM9M10G45-EK board
> + *
> + * Copyright (C) 2011 Atmel,
> + * 2011 Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> + *
> + * Licensed under GPLv2 or later.
> + */
> +/dts-v1/;
> +/include/ "at91sam9g45.dtsi"
> +
> +/ {
> + model = "Atmel AT91SAM9M10G45-EK";
> + compatible = "atmel,at91sam9m10g45ek", "atmel,at91sam9g45", "atmel,at91sam9";
> +
> + chosen {
> + bootargs = "mem=64M console=ttyS0,115200 mtdparts=atmel_nand:4M(bootstrap/uboot/kernel)ro,60M(rootfs),-(data) root=/dev/mtdblock1 rw rootfstype=jffs2";
> + };
> +
> + memory {
> + reg = <0x70000000 0x4000000>;
> + };
> +
> + ahb {
> + apb {
> + usart0: serial@fff8c000 {
> + status = "disabled";
> + };
> + usart2: serial@fff94000 {
> + status = "disabled";
> + };
> + usart3: serial@fff98000 {
> + status = "disabled";
> + };
> + };
> + };
> +};
> diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
> index 2248467..4b59d96 100644
> --- a/arch/arm/mach-at91/Kconfig
> +++ b/arch/arm/mach-at91/Kconfig
> @@ -442,6 +442,17 @@ endif
>
> # ----------------------------------------------------------
>
> +comment "Generic Board Type"
> +
> +config MACH_AT91SAM_DT
> + bool "Atmel AT91SAM Evaluation Kits with device-tree support"
> + select USE_OF
> + help
> + Select this if you want to experiment device-tree with
> + an Atmel Evaluation Kit.
> +
> +# ----------------------------------------------------------
> +
> comment "AT91 Board Options"
>
> config MTD_AT91_DATAFLASH_CARD
> diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
> index bf57e8b..3ff245e 100644
> --- a/arch/arm/mach-at91/Makefile
> +++ b/arch/arm/mach-at91/Makefile
> @@ -74,6 +74,9 @@ obj-$(CONFIG_MACH_SNAPPER_9260) += board-snapper9260.o
> # AT91SAM9G45 board-specific support
> obj-$(CONFIG_MACH_AT91SAM9M10G45EK) += board-sam9m10g45ek.o
>
> +# AT91SAM board with device-tree
> +obj-$(CONFIG_MACH_AT91SAM_DT) += board-dt.o
> +
> # AT91CAP9 board-specific support
> obj-$(CONFIG_MACH_AT91CAP9ADK) += board-cap9adk.o
>
> diff --git a/arch/arm/mach-at91/Makefile.boot b/arch/arm/mach-at91/Makefile.boot
> index 3462b81..d278863 100644
> --- a/arch/arm/mach-at91/Makefile.boot
> +++ b/arch/arm/mach-at91/Makefile.boot
> @@ -16,3 +16,5 @@ else
> params_phys-y := 0x20000100
> initrd_phys-y := 0x20410000
> endif
> +
> +dtb-$(CONFIG_MACH_AT91SAM_DT) += at91sam9m10g45ek.dtb
> diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c
> index bb84040..27276b8 100644
> --- a/arch/arm/mach-at91/at91sam9g45_devices.c
> +++ b/arch/arm/mach-at91/at91sam9g45_devices.c
> @@ -69,9 +69,16 @@ static struct platform_device at_hdmac_device = {
>
> void __init at91_add_device_hdmac(void)
> {
> - dma_cap_set(DMA_MEMCPY, atdma_pdata.cap_mask);
> - dma_cap_set(DMA_SLAVE, atdma_pdata.cap_mask);
> - platform_device_register(&at_hdmac_device);
> + struct device_node *of_node =
> + of_find_node_by_name(NULL, "dma-controller");

You should really search by the compatible string.

> +
> + if (of_node) {
> + of_node_put(of_node);
> + } else {
> + dma_cap_set(DMA_MEMCPY, atdma_pdata.cap_mask);
> + dma_cap_set(DMA_SLAVE, atdma_pdata.cap_mask);

This really should be in the driver.

> + platform_device_register(&at_hdmac_device);
> + }
> }
> #else
> void __init at91_add_device_hdmac(void) {}
> @@ -1556,10 +1563,15 @@ void __init at91_set_serial_console(unsigned portnr)
> void __init at91_add_device_serial(void)
> {
> int i;
> + struct device_node *of_node = of_find_node_by_name(NULL, "serial");
>
> - for (i = 0; i < ATMEL_MAX_UART; i++) {
> - if (at91_uarts[i])
> - platform_device_register(at91_uarts[i]);
> + if (of_node) {
> + of_node_put(of_node);
> + } else {
> + for (i = 0; i < ATMEL_MAX_UART; i++) {
> + if (at91_uarts[i])
> + platform_device_register(at91_uarts[i]);
> + }

Why can't you only call these init functions when booting non-DT?

> }
>
> if (!atmel_default_console_device)
> diff --git a/arch/arm/mach-at91/board-dt.c b/arch/arm/mach-at91/board-dt.c
> new file mode 100644
> index 0000000..7bcb9a9
> --- /dev/null
> +++ b/arch/arm/mach-at91/board-dt.c
> @@ -0,0 +1,122 @@
> +/*
> + * Setup code for AT91SAM Evaluation Kits with Device Tree support
> + *
> + * Covers: * AT91SAM9G45-EKES board
> + * * AT91SAM9M10-EKES board
> + * * AT91SAM9M10G45-EK board
> + *
> + * Copyright (C) 2011 Atmel,
> + * 2011 Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> + *
> + * Licensed under GPLv2 or later.
> + */
> +
> +#include <linux/types.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/irqdomain.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +
> +#include <mach/hardware.h>
> +#include <mach/board.h>
> +#include <mach/gpio.h>
> +#include <mach/system_rev.h>
> +#include <mach/at91sam9_smc.h>
> +
> +#include <asm/setup.h>
> +#include <asm/irq.h>
> +#include <asm/mach/arch.h>
> +#include <asm/mach/map.h>
> +#include <asm/mach/irq.h>
> +
> +#include "sam9_smc.h"
> +#include "generic.h"
> +
> +
> +static void __init ek_init_early(void)
> +{
> + /* Initialize processor: 12.000 MHz crystal */
> + at91_initialize(12000000);
> +
> + /* DGBU on ttyS0. (Rx & Tx only) */
> + at91_register_uart(0, 0, 0);
> +
> + /* USART0 not connected on the -EK board */
> + /* USART1 on ttyS2. (Rx, Tx, RTS, CTS) */
> + at91_register_uart(AT91SAM9G45_ID_US1, 2, ATMEL_UART_CTS | ATMEL_UART_RTS);
> +
> + /* set serial console to ttyS0 (ie, DBGU) */
> + at91_set_serial_console(0);
> +}
> +
> +/* det_pin is not connected */
> +static struct atmel_nand_data __initdata ek_nand_data = {
> + .ale = 21,
> + .cle = 22,
> + .rdy_pin = AT91_PIN_PC8,
> + .enable_pin = AT91_PIN_PC14,
> +};
> +
> +static struct sam9_smc_config __initdata ek_nand_smc_config = {
> + .ncs_read_setup = 0,
> + .nrd_setup = 2,
> + .ncs_write_setup = 0,
> + .nwe_setup = 2,
> +
> + .ncs_read_pulse = 4,
> + .nrd_pulse = 4,
> + .ncs_write_pulse = 4,
> + .nwe_pulse = 4,
> +
> + .read_cycle = 7,
> + .write_cycle = 7,
> +
> + .mode = AT91_SMC_READMODE | AT91_SMC_WRITEMODE | AT91_SMC_EXNWMODE_DISABLE,
> + .tdf_cycles = 3,
> +};
> +
> +static void __init ek_add_device_nand(void)
> +{
> + ek_nand_data.bus_width_16 = board_have_nand_16bit();
> + /* setup bus-width (8 or 16) */
> + if (ek_nand_data.bus_width_16)
> + ek_nand_smc_config.mode |= AT91_SMC_DBW_16;
> + else
> + ek_nand_smc_config.mode |= AT91_SMC_DBW_8;
> +
> + /* configure chip-select 3 (NAND) */
> + sam9_smc_configure(3, &ek_nand_smc_config);
> +
> + at91_add_device_nand(&ek_nand_data);
> +}
> +
> +static const struct of_device_id aic_of_match[] __initconst = {
> + { .compatible = "atmel,at91rm9200-aic", },
> + {},
> +};
> +
> +static void __init at91_dt_device_init(void)
> +{
> + irq_domain_generate_simple(aic_of_match, 0xfffff000, 0);

Why is this not in the .init_irq function? I'm surprised your timer
interrupt even works.

Rob

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Next message: Peter Zijlstra: "[PATCH] mm, arch: Complete pagefault_disable abstraction"
Previous message: Sasha Levin: "Re: [PATCH v2 1/2] virtio-net: Verify page list size beforefitting into skb"
In reply to: Russell King - ARM Linux: "Re: [PATCH V2] AT91: dt: at91sam9g45 family and board device treefiles"
Next in thread: Nicolas Ferre: "Re: [PATCH V2] AT91: dt: at91sam9g45 family and board device treefiles"
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