[U-Boot] [PATCH 1/4] gpio: Adds GPIO driver support for Armada100
Prafulla Wadaskar
prafulla at marvell.com
Mon Jul 18 21:01:31 CEST 2011
> -----Original Message-----
> From: Ajay Bhargav [mailto:ajay.bhargav at einfochips.com]
> Sent: Monday, July 18, 2011 3:12 PM
> To: Prafulla Wadaskar
> Cc: u-boot at lists.denx.de; Ajay Bhargav
> Subject: [PATCH 1/4] gpio: Adds GPIO driver support for Armada100
Correct patch name as
gpio: Add GPIO driver for Marvell SoC Armada100
>
> This patch adds generic GPIO driver framework support for Armada100
> series.
>
> To enable GPIO driver define CONFIG_ARMADA100_GPIO and for GPIO commands
> define CONFIG_CMD_GPIO in your board configuration file.
>
> NOTE: This driver assumes proper configuration of MFP register for the
> GPIO
> in use.
>
> These patches depends on patch series that adds support for Marvell
> Guruplug-Display [1,2].
>
> Signed-off-by: Ajay Bhargav <ajay.bhargav at einfochips.com>
> ---
> arch/arm/include/asm/arch-armada100/gpio.h | 130 +++++++++++++++++++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/armada100_gpio.c | 192
> ++++++++++++++++++++++++++++
> 3 files changed, 323 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/include/asm/arch-armada100/gpio.h
> create mode 100644 drivers/gpio/armada100_gpio.c
>
> diff --git a/arch/arm/include/asm/arch-armada100/gpio.h
> b/arch/arm/include/asm/arch-armada100/gpio.h
> new file mode 100644
> index 0000000..9024a2e
> --- /dev/null
> +++ b/arch/arm/include/asm/arch-armada100/gpio.h
> @@ -0,0 +1,130 @@
> +/*
> + * (C) Copyright 2010
2011???
> + * eInfochips Ltd. <www.einfochips.com>
> + * Written-by: Ajay Bhargav <ajay.bhargav at einfochips.com>
> + *
> + * (C) Copyright 2010
> + * Marvell Semiconductor <www.marvell.com>
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA 02110-1301 USA
> + */
> +
> +#ifndef _ASM_ARCH_GPIO_H
> +#define _ASM_ARCH_GPIO_H
> +
> +#ifndef __ASSEMBLY__
> +#include <asm/types.h>
> +#endif
> +
> +#if defined(CONFIG_ARMADA100_GPIO)
> +#include <asm/arch/armada100.h>
> +
> +#define GPIO_LABEL_MAX 20
> +#define ARMD_MAX_GPIO 128
Pls derive it from MAX_MFP
> +
> +#define GPIO_TO_REG(gp) (gp >> 5)
> +#define GPIO_TO_BIT(gp) (1 << (gp & 0x1F))
> +#define GPIO_VAL(gp, val) ((val >> (gp & 0x1F)) & 0x01)
> +
> +#define GPIO_SET 1
> +#define GPIO_CLR 0
> +
> +/*
> + * GPIO register map
> + * Refer Datasheet Appendix A.36
> + */
> +struct armdgpio_registers {
> + u32 gplr0; /* Pin Level Register - 0x0000 */
> + u32 gplr1; /* 0x0004 */
> + u32 gplr2; /* 0x0008 */
> + u32 gpdr0; /* Pin Direction Register - 0x000C */
NAK
You should define all GPIO register in a single struct
And point them with base address offsets
> + u32 gpdr1; /* 0x0010 */
> + u32 gpdr2; /* 0x0014 */
> + u32 gpsr0; /* Pin Output Set Register - 0x0018 */
> + u32 gpsr1; /* 0x001C */
> + u32 gpsr2; /* 0x0020 */
> + u32 gpcr0; /* Pin Output Clear Register - 0x0024 */
> + u32 gpcr1; /* 0x0028 */
> + u32 gpcr2; /* 0x002C */
> + u32 grer0; /* Rising-Edge Detect Enable Register - 0x0030 */
> + u32 grer1; /* 0x0034 */
> + u32 grer2; /* 0x0038 */
> + u32 gfer0; /* Falling-Edge Detect Enable Register - 0x003C */
> + u32 gfer1; /* 0x0040 */
> + u32 gfer2; /* 0x0044 */
> + u32 gedr0; /* Edge Detect Status Register - 0x0048 */
> + u32 gedr1; /* 0x004C */
> + u32 gedr2; /* 0x0050 */
> + u32 gsdr0; /* Bitwise Set of GPIO Direction Register - 0x0054 */
> + u32 gsdr1; /* 0x0058 */
> + u32 gsdr2; /* 0x005C */
> + u32 gcdr0; /* Bitwise Clear of GPIO Direction Register - 0x0060 */
> + u32 gcdr1; /* 0x0064 */
> + u32 gcdr2; /* 0x0068 */
> + u32 gsrer0; /* Bitwise Set of Rising-Edge Detect Enable
> + Register - 0x006C */
> + u32 gsrer1; /* 0x0070 */
> + u32 gsrer2; /* 0x0074 */
> + u32 gcrer0; /* Bitwise Clear of Rising-Edge Detect Enable
> + Register - 0x0078 */
> + u32 gcrer1; /* 0x007C */
> + u32 gcrer2; /* 0x0080 */
> + u32 gsfer0; /* Bitwise Set of Falling-Edge Detect Enable
> + Register - 0x0084 */
> + u32 gsfer1; /* 0x0088 */
> + u32 gsfer2; /* 0x008C */
> + u32 gcfer0; /* Bitwise Clear of Falling-Edge Detect Enable
> + Register - 0x0090 */
> + u32 gcfer1; /* 0x0094 */
> + u32 gcfer2; /* 0x0098 */
> + u32 apmask0; /* Bitwise Mask of Edge Detect Register - 0x009C */
> + u32 apmask1; /* 0x00A0 */
> + u32 apmask2; /* 0x00A4 */
> + u8 pad[0x0100 - 0x00A4 - 4];
> + u32 gplr3; /* 0x0100 */
> + u8 pad1[0x010C - 0x0100 - 4];
> + u32 gpdr3; /* 0x010C */
> + u8 pad2[0x0118 - 0x010C - 4];
> + u32 gpsr3; /* 0x0118 */
> + u8 pad3[0x0124 - 0x0118 - 4];
> + u32 gpcr3; /* 0x0124 */
> + u8 pad4[0x0130 - 0x0124 - 4];
> + u32 grer3; /* 0x0130 */
> + u8 pad5[0x013C - 0x0130 - 4];
> + u32 gfer3; /* 0x013C */
> + u8 pad6[0x0148 - 0x013C - 4];
> + u32 gedr3; /* 0x0148 */
> + u8 pad7[0x0154 - 0x0148 - 4];
> + u32 gsdr3; /* 0x0154 */
> + u8 pad8[0x0160 - 0x0154 - 4];
> + u32 gcdr3; /* 0x0160 */
> + u8 pad9[0x016C - 0x0160 - 4];
> + u32 gsrer3; /* 0x016C */
> + u8 pad10[0x0178 - 0x016C - 4];
> + u32 gcrer3; /* 0x0178 */
> + u8 pad11[0x0184 - 0x0178 - 4];
> + u32 gsfer3; /* 0x0184 */
> + u8 pad12[0x0190 - 0x0184 - 4];
> + u32 gcfer3; /* 0x0190 */
> + u8 pad13[0x019C - 0x0190 - 4];
> + u32 apmask3; /* 0x019C */
> +};
> +
> +#endif /* CONFIG_ARMADA100_GPIO */
> +#endif /* _ASM_ARCH_GPIO_H */
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 1e3ae11..31b83cd 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
> LIB := $(obj)libgpio.o
>
> COBJS-$(CONFIG_AT91_GPIO) += at91_gpio.o
> +COBJS-$(CONFIG_ARMADA100_GPIO) += armada100_gpio.o
I suggest you to add mvgpio.c instead of armada100_gpio.c
This will be used in future by other Marvell SoCs.
> COBJS-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
> COBJS-$(CONFIG_MARVELL_MFP) += mvmfp.o
> COBJS-$(CONFIG_MXC_GPIO) += mxc_gpio.o
> diff --git a/drivers/gpio/armada100_gpio.c
> b/drivers/gpio/armada100_gpio.c
> new file mode 100644
> index 0000000..578fdac
> --- /dev/null
> +++ b/drivers/gpio/armada100_gpio.c
> @@ -0,0 +1,192 @@
> +/*
> + * (C) Copyright 2010
2011??
> + * eInfochips Ltd. <www.einfochips.com>
> + * Written-by: Ajay Bhargav <ajay.bhargav at einfochips.com>
> + *
> + * (C) Copyright 2010
> + * Marvell Semiconductor <www.marvell.com>
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA 02110-1301 USA
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +#include <asm/errno.h>
> +#include <asm/gpio.h>
> +
> +int gpio_request(int gp, const char *label)
> +{
> + /*
> + * Assumes corresponding MFP is configured peoperly
> + * for use as GPIO
> + */
NAK, you should check here, respective MFP is being configured as GPIO, if not you should return error
> + return 0;
> +}
> +
> +void gpio_free(int gp)
> +{
> + /* default direction for GPIO is input */
> + gpio_direction_input(gp);
> +}
> +
> +void gpio_toggle_value(int gp)
> +{
> + gpio_set_value(gp, !gpio_get_value(gp));
> +}
> +
> +int gpio_direction_input(int gp)
> +{
> + struct armdgpio_registers *gpio_regs =
> + (struct armdgpio_registers *)ARMD1_GPIO_BASE;
Consider now this is generic GPIO driver for marvell SOCs, define this macro in gpio.h
> +
> + if (gp < ARMD_MAX_GPIO) {
> + switch (GPIO_TO_REG(gp)) {
Some code comments are welcomed here.
> + case 0:
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gcdr0);
> + break;
> + case 1:
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gcdr1);
> + break;
> + case 2:
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gcdr2);
> + break;
> + case 3:
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gcdr3);
> + break;
> + default:
> + return -EINVAL;
> + }
> + } else {
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +int gpio_direction_output(int gp, int value)
> +{
> + struct armdgpio_registers *gpio_regs =
> + (struct armdgpio_registers *)ARMD1_GPIO_BASE;
> +
> + if (gp < ARMD_MAX_GPIO) {
> + switch (GPIO_TO_REG(gp)) {
> + case 0:
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gsdr0);
Call gpio_set_value(gp, value) here which is defined below doing the same
> + if (value)
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpsr0);
> + else
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpcr0);
> + break;
> + case 1:
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gsdr1);
> + if (value)
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpsr1);
> + else
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpcr1);
> + break;
> + case 2:
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gsdr2);
> + if (value)
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpsr2);
> + else
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpcr2);
> + break;
> + case 3:
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gsdr3);
> + if (value)
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpsr3);
> + else
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpcr3);
> + break;
> + default:
> + return -EINVAL;
> + }
> + } else {
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +int gpio_get_value(int gp)
> +{
> + struct armdgpio_registers *gpio_regs =
> + (struct armdgpio_registers *)ARMD1_GPIO_BASE;
> + u32 gp_val;
> +
> + if (gp < ARMD_MAX_GPIO) {
> + switch (GPIO_TO_REG(gp)) {
> + case 0:
> + gp_val = readl(&gpio_regs->gplr0);
> + break;
> + case 1:
> + gp_val = readl(&gpio_regs->gplr1);
> + break;
> + case 2:
> + gp_val = readl(&gpio_regs->gplr2);
> + break;
> + case 3:
> + gp_val = readl(&gpio_regs->gplr3);
> + break;
> + default:
> + return -EINVAL;
> + }
> + } else {
> + return -EINVAL;
> + }
> +
> + return GPIO_VAL(gp, gp_val);
> +}
> +
> +void gpio_set_value(int gp, int value)
> +{
> + struct armdgpio_registers *gpio_regs =
> + (struct armdgpio_registers *)ARMD1_GPIO_BASE;
> +
> + if (gp < ARMD_MAX_GPIO) {
> + switch (GPIO_TO_REG(gp)) {
> + case 0:
> + if (value)
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpsr0);
> + else
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpcr0);
> + break;
> + case 1:
> + if (value)
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpsr1);
> + else
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpcr1);
> + break;
> + case 2:
> + if (value)
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpsr2);
> + else
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpcr2);
> + break;
> + case 3:
> + if (value)
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpsr3);
> + else
> + writel(GPIO_TO_BIT(gp), &gpio_regs->gpcr3);
> + break;
> + default:
> + panic("Invalid GPIO pin %u\n", gp);
> + }
> + } else {
> + panic("Invalid GPIO pin %u\n", gp);
Can you eliminate one panic line here?
Regards..
Prafulla . .
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