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Message-ID: <20110706220240.GF5371@ponder.secretlab.ca>
Date: Wed, 6 Jul 2011 16:02:40 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Sekhar Nori <nsekhar@...com>
Cc: linux-kernel@...r.kernel.org, Kevin Hilman <khilman@...com>,
Cyril Chemparathy <cyril@...com>,
linux-arm-kernel@...ts.infradead.org,
davinci-linux-open-source@...ux.davincidsp.com
Subject: Re: [RFC/RFT 2/2] davinci: use generic memory mapped gpio for
tnetv107x
On Tue, Jul 05, 2011 at 10:41:00AM +0530, Sekhar Nori wrote:
> The GPIO controller on TNETV107x SoC can use
> the generic memory mapped GPIO driver.
>
> Shift to the generic driver instead of the
> private implementation.
>
> Signed-off-by: Sekhar Nori <nsekhar@...com>
> ---
> arch/arm/mach-davinci/Kconfig | 1 +
> arch/arm/mach-davinci/Makefile | 1 -
> arch/arm/mach-davinci/devices-tnetv107x.c | 68 ++++++++++
> arch/arm/mach-davinci/gpio-tnetv107x.c | 205 -----------------------------
> arch/arm/mach-davinci/tnetv107x.c | 3 -
> 5 files changed, 69 insertions(+), 209 deletions(-)
> delete mode 100644 arch/arm/mach-davinci/gpio-tnetv107x.c
>
> diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
> index c0deaca..ec0c6d3 100644
> --- a/arch/arm/mach-davinci/Kconfig
> +++ b/arch/arm/mach-davinci/Kconfig
> @@ -53,6 +53,7 @@ config ARCH_DAVINCI_DM365
> config ARCH_DAVINCI_TNETV107X
> select CPU_V6
> select CP_INTC
> + select GPIO_GENERIC_PLATFORM
> bool "TNETV107X based system"
>
> comment "DaVinci Board Type"
> diff --git a/arch/arm/mach-davinci/Makefile b/arch/arm/mach-davinci/Makefile
> index 0b87a1c..40557c8 100644
> --- a/arch/arm/mach-davinci/Makefile
> +++ b/arch/arm/mach-davinci/Makefile
> @@ -17,7 +17,6 @@ obj-$(CONFIG_ARCH_DAVINCI_DM365) += dm365.o devices.o
> obj-$(CONFIG_ARCH_DAVINCI_DA830) += da830.o devices-da8xx.o
> obj-$(CONFIG_ARCH_DAVINCI_DA850) += da850.o devices-da8xx.o
> obj-$(CONFIG_ARCH_DAVINCI_TNETV107X) += tnetv107x.o devices-tnetv107x.o
> -obj-$(CONFIG_ARCH_DAVINCI_TNETV107X) += gpio-tnetv107x.o
>
> obj-$(CONFIG_AINTC) += irq.o
> obj-$(CONFIG_CP_INTC) += cp_intc.o
> diff --git a/arch/arm/mach-davinci/devices-tnetv107x.c b/arch/arm/mach-davinci/devices-tnetv107x.c
> index 6162cae..eab43b1 100644
> --- a/arch/arm/mach-davinci/devices-tnetv107x.c
> +++ b/arch/arm/mach-davinci/devices-tnetv107x.c
> @@ -18,6 +18,7 @@
> #include <linux/dma-mapping.h>
> #include <linux/clk.h>
> #include <linux/slab.h>
> +#include <linux/basic_mmio_gpio.h>
>
> #include <mach/common.h>
> #include <mach/irqs.h>
> @@ -31,6 +32,7 @@
> #define TNETV107X_TPTC0_BASE 0x01c10000
> #define TNETV107X_TPTC1_BASE 0x01c10400
> #define TNETV107X_WDOG_BASE 0x08086700
> +#define TNETV107X_GPIO_BASE 0x08088000
> #define TNETV107X_TSC_BASE 0x08088500
> #define TNETV107X_SDIO0_BASE 0x08088700
> #define TNETV107X_SDIO1_BASE 0x08088800
> @@ -362,11 +364,77 @@ static struct platform_device ssp_device = {
> .resource = ssp_resources,
> };
>
> +#define TNETV107X_N_GPIO_DEV DIV_ROUND_UP(TNETV107X_N_GPIO, 32)
> +
> +static struct resource gpio_resources[TNETV107X_N_GPIO_DEV][4] = {
> + [0 ... TNETV107X_N_GPIO_DEV - 1] = {
If all the data is identical, why does this need to be an array?
> + {
> + .name = "dat",
> + .start = TNETV107X_GPIO_BASE + 0x4,
> + .end = TNETV107X_GPIO_BASE + 0x4 + 0x4 - 1,
> + },
> + {
> + .name = "set",
> + .start = TNETV107X_GPIO_BASE + 0x10,
> + .end = TNETV107X_GPIO_BASE + 0x10 + 0x4 - 1,
> + },
> + {
> + .name = "dirin",
> + .start = TNETV107X_GPIO_BASE + 0x1c,
> + .end = TNETV107X_GPIO_BASE + 0x1c + 0x4 - 1,
> + },
> + {
> + .name = "en",
> + .start = TNETV107X_GPIO_BASE + 0x28,
> + .end = TNETV107X_GPIO_BASE + 0x28 + 0x4 - 1,
> + },
> + },
> +};
Wow, this ends up looking horrible. (yes, I know it is not your
fault). I backed off earlier on using resources for the offsets, but
I want to change my mind again and make interface a register range +
offsets to the control registers.
> +
> +static struct platform_device gpio_device[] = {
> + [0 ... TNETV107X_N_GPIO_DEV - 1] = {
> + .name = "basic-mmio-gpio",
> + .num_resources = 4,
> + },
> +};
> +
> +static struct bgpio_pdata gpio_pdata[TNETV107X_N_GPIO_DEV];
> +
> +static void __init tnetv107x_gpio_init(void)
> +{
> + int i, j;
> +
> + for (i = 1; i < TNETV107X_N_GPIO_DEV; i++) {
> + for (j = 0; j < 4; j++) {
> + gpio_resources[i][j].start += 0x4 * i;
> + gpio_resources[i][j].end += 0x4 * i;
> + }
> + }
> +
> + for (i = 0; i < TNETV107X_N_GPIO_DEV; i++) {
> + int base = i * 32;
> +
> + gpio_device[i].id = i;
> + gpio_device[i].resource = gpio_resources[i];
> +
> + gpio_pdata[i].base = base;
> + gpio_pdata[i].ngpio = TNETV107X_N_GPIO - base;
? This doesn't look right. Shouldn't ngpio be the same for each gpio
controller instance?
> + if (gpio_pdata[i].ngpio > 32)
> + gpio_pdata[i].ngpio = 32;
> +
> + gpio_device[i].dev.platform_data = &gpio_pdata[i];
> +
> + platform_device_register(&gpio_device[i]);
> + }
> +}
> +
> void __init tnetv107x_devices_init(struct tnetv107x_device_info *info)
> {
> int i, error;
> struct clk *tsc_clk;
>
> + tnetv107x_gpio_init();
> +
> /*
> * The reset defaults for tnetv107x tsc clock divider is set too high.
> * This forces the clock down to a range that allows the ADC to
> diff --git a/arch/arm/mach-davinci/gpio-tnetv107x.c b/arch/arm/mach-davinci/gpio-tnetv107x.c
> deleted file mode 100644
> index 3fa3e28..0000000
> --- a/arch/arm/mach-davinci/gpio-tnetv107x.c
> +++ /dev/null
> @@ -1,205 +0,0 @@
> -/*
> - * Texas Instruments TNETV107X GPIO Controller
> - *
> - * Copyright (C) 2010 Texas Instruments
> - *
> - * 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 version 2.
> - *
> - * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> - * kind, whether express or implied; without even the implied warranty
> - * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> - * GNU General Public License for more details.
> - */
> -#include <linux/kernel.h>
> -#include <linux/init.h>
> -#include <linux/gpio.h>
> -
> -#include <mach/common.h>
> -#include <mach/tnetv107x.h>
> -
> -struct tnetv107x_gpio_regs {
> - u32 idver;
> - u32 data_in[3];
> - u32 data_out[3];
> - u32 direction[3];
> - u32 enable[3];
> -};
> -
> -#define gpio_reg_index(gpio) ((gpio) >> 5)
> -#define gpio_reg_bit(gpio) BIT((gpio) & 0x1f)
> -
> -#define gpio_reg_rmw(reg, mask, val) \
> - __raw_writel((__raw_readl(reg) & ~(mask)) | (val), (reg))
> -
> -#define gpio_reg_set_bit(reg, gpio) \
> - gpio_reg_rmw((reg) + gpio_reg_index(gpio), 0, gpio_reg_bit(gpio))
> -
> -#define gpio_reg_clear_bit(reg, gpio) \
> - gpio_reg_rmw((reg) + gpio_reg_index(gpio), gpio_reg_bit(gpio), 0)
> -
> -#define gpio_reg_get_bit(reg, gpio) \
> - (__raw_readl((reg) + gpio_reg_index(gpio)) & gpio_reg_bit(gpio))
> -
> -#define chip2controller(chip) \
> - container_of(chip, struct davinci_gpio_controller, chip)
> -
> -#define TNETV107X_GPIO_CTLRS DIV_ROUND_UP(TNETV107X_N_GPIO, 32)
> -
> -static struct davinci_gpio_controller chips[TNETV107X_GPIO_CTLRS];
> -
> -static int tnetv107x_gpio_request(struct gpio_chip *chip, unsigned offset)
> -{
> - struct davinci_gpio_controller *ctlr = chip2controller(chip);
> - struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
> - unsigned gpio = chip->base + offset;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&ctlr->lock, flags);
> -
> - gpio_reg_set_bit(regs->enable, gpio);
> -
> - spin_unlock_irqrestore(&ctlr->lock, flags);
> -
> - return 0;
> -}
> -
> -static void tnetv107x_gpio_free(struct gpio_chip *chip, unsigned offset)
> -{
> - struct davinci_gpio_controller *ctlr = chip2controller(chip);
> - struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
> - unsigned gpio = chip->base + offset;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&ctlr->lock, flags);
> -
> - gpio_reg_clear_bit(regs->enable, gpio);
> -
> - spin_unlock_irqrestore(&ctlr->lock, flags);
> -}
> -
> -static int tnetv107x_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
> -{
> - struct davinci_gpio_controller *ctlr = chip2controller(chip);
> - struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
> - unsigned gpio = chip->base + offset;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&ctlr->lock, flags);
> -
> - gpio_reg_set_bit(regs->direction, gpio);
> -
> - spin_unlock_irqrestore(&ctlr->lock, flags);
> -
> - return 0;
> -}
> -
> -static int tnetv107x_gpio_dir_out(struct gpio_chip *chip,
> - unsigned offset, int value)
> -{
> - struct davinci_gpio_controller *ctlr = chip2controller(chip);
> - struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
> - unsigned gpio = chip->base + offset;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&ctlr->lock, flags);
> -
> - if (value)
> - gpio_reg_set_bit(regs->data_out, gpio);
> - else
> - gpio_reg_clear_bit(regs->data_out, gpio);
> -
> - gpio_reg_clear_bit(regs->direction, gpio);
> -
> - spin_unlock_irqrestore(&ctlr->lock, flags);
> -
> - return 0;
> -}
> -
> -static int tnetv107x_gpio_get(struct gpio_chip *chip, unsigned offset)
> -{
> - struct davinci_gpio_controller *ctlr = chip2controller(chip);
> - struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
> - unsigned gpio = chip->base + offset;
> - int ret;
> -
> - ret = gpio_reg_get_bit(regs->data_in, gpio);
> -
> - return ret ? 1 : 0;
> -}
> -
> -static void tnetv107x_gpio_set(struct gpio_chip *chip,
> - unsigned offset, int value)
> -{
> - struct davinci_gpio_controller *ctlr = chip2controller(chip);
> - struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
> - unsigned gpio = chip->base + offset;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&ctlr->lock, flags);
> -
> - if (value)
> - gpio_reg_set_bit(regs->data_out, gpio);
> - else
> - gpio_reg_clear_bit(regs->data_out, gpio);
> -
> - spin_unlock_irqrestore(&ctlr->lock, flags);
> -}
> -
> -static int __init tnetv107x_gpio_setup(void)
> -{
> - int i, base;
> - unsigned ngpio;
> - struct davinci_soc_info *soc_info = &davinci_soc_info;
> - struct tnetv107x_gpio_regs *regs;
> - struct davinci_gpio_controller *ctlr;
> -
> - if (soc_info->gpio_type != GPIO_TYPE_TNETV107X)
> - return 0;
> -
> - ngpio = soc_info->gpio_num;
> - if (ngpio == 0) {
> - pr_err("GPIO setup: how many GPIOs?\n");
> - return -EINVAL;
> - }
> -
> - if (WARN_ON(TNETV107X_N_GPIO < ngpio))
> - ngpio = TNETV107X_N_GPIO;
> -
> - regs = ioremap(soc_info->gpio_base, SZ_4K);
> - if (WARN_ON(!regs))
> - return -EINVAL;
> -
> - for (i = 0, base = 0; base < ngpio; i++, base += 32) {
> - ctlr = &chips[i];
> -
> - ctlr->chip.label = "tnetv107x";
> - ctlr->chip.can_sleep = 0;
> - ctlr->chip.base = base;
> - ctlr->chip.ngpio = ngpio - base;
> - if (ctlr->chip.ngpio > 32)
> - ctlr->chip.ngpio = 32;
> -
> - ctlr->chip.request = tnetv107x_gpio_request;
> - ctlr->chip.free = tnetv107x_gpio_free;
> - ctlr->chip.direction_input = tnetv107x_gpio_dir_in;
> - ctlr->chip.get = tnetv107x_gpio_get;
> - ctlr->chip.direction_output = tnetv107x_gpio_dir_out;
> - ctlr->chip.set = tnetv107x_gpio_set;
> -
> - spin_lock_init(&ctlr->lock);
> -
> - ctlr->regs = regs;
> - ctlr->set_data = ®s->data_out[i];
> - ctlr->clr_data = ®s->data_out[i];
> - ctlr->in_data = ®s->data_in[i];
> -
> - gpiochip_add(&ctlr->chip);
> - }
> -
> - soc_info->gpio_ctlrs = chips;
> - soc_info->gpio_ctlrs_num = DIV_ROUND_UP(ngpio, 32);
> - return 0;
> -}
> -pure_initcall(tnetv107x_gpio_setup);
> diff --git a/arch/arm/mach-davinci/tnetv107x.c b/arch/arm/mach-davinci/tnetv107x.c
> index 1b28fdd..11399d4 100644
> --- a/arch/arm/mach-davinci/tnetv107x.c
> +++ b/arch/arm/mach-davinci/tnetv107x.c
> @@ -39,7 +39,6 @@
> #define TNETV107X_TIMER0_BASE 0x08086500
> #define TNETV107X_TIMER1_BASE 0x08086600
> #define TNETV107X_CHIP_CFG_BASE 0x08087000
> -#define TNETV107X_GPIO_BASE 0x08088000
> #define TNETV107X_CLOCK_CONTROL_BASE 0x0808a000
> #define TNETV107X_PSC_BASE 0x0808b000
>
> @@ -746,9 +745,7 @@ static struct davinci_soc_info tnetv107x_soc_info = {
> .intc_irq_prios = irq_prios,
> .intc_irq_num = TNETV107X_N_CP_INTC_IRQ,
> .intc_host_map = intc_host_map,
> - .gpio_base = TNETV107X_GPIO_BASE,
> .gpio_type = GPIO_TYPE_TNETV107X,
> - .gpio_num = TNETV107X_N_GPIO,
> .timer_info = &timer_info,
> .serial_dev = &tnetv107x_serial_device,
> .reset = tnetv107x_watchdog_reset,
> --
> 1.7.3.2
>
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