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gpio: Drop long unused DB8500 GPIO driver

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The original U-Boot port for the ST-Ericsson U8500 SoC was dropped
in commit 68282f55b8 ("arm: Remove unused ST-Ericsson u8500 arch").
Most of the drivers related to the old port were removed, but the
db8500_gpio.c driver was forgotten for some reason. There is no way
to select it and it does not compile anymore because of missing
headers, so let's just remove it.

The new port for U8500 introduced in commit 689088f9da
("arm: Add support for ST-Ericsson U8500 SoC") fully embraces the
new Driver Model and device trees where possible, so this is
preparation to add a new, simplified GPIO driver based on DM_GPIO.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stephan Gerhold 2021-07-02 17:06:17 +02:00 committed by Tom Rini
parent 24e9bfb269
commit 05e5ba2127
2 changed files with 0 additions and 222 deletions
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1
drivers/gpio/Makefile
View file

@ -43,7 +43,6 @@ obj-$(CONFIG_MPC8XXX_GPIO) += mpc8xxx_gpio.o
obj-$(CONFIG_MPC83XX_SPISEL_BOOT) += mpc83xx_spisel_boot.o
obj-$(CONFIG_SH_GPIO_PFC) += sh_pfc.o
obj-$(CONFIG_OMAP_GPIO) += omap_gpio.o
obj-$(CONFIG_DB8500_GPIO) += db8500_gpio.o
obj-$(CONFIG_BCM2835_GPIO) += bcm2835_gpio.o
obj-$(CONFIG_XILINX_GPIO) += xilinx_gpio.o
obj-$(CONFIG_ADI_GPIO2) += adi_gpio2.o

221
drivers/gpio/db8500_gpio.c
View file

@ -1,221 +0,0 @@
/*
* Code ported from Nomadik GPIO driver in ST-Ericsson Linux kernel code.
* The purpose is that GPIO config found in kernel should work by simply
* copy-paste it to U-Boot.
*
* Original Linux authors:
* Copyright (C) 2008,2009 STMicroelectronics
* Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
* Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
*
* Ported to U-Boot by:
* Copyright (C) 2010 Joakim Axelsson <joakim.axelsson AT stericsson.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/db8500_gpio.h>
#include <asm/arch/db8500_pincfg.h>
#include <linux/compiler.h>
#define IO_ADDR(x) (void *) (x)
/*
* The GPIO module in the db8500 Systems-on-Chip is an
* AMBA device, managing 32 pins and alternate functions. The logic block
* is currently only used in the db8500.
*/
#define GPIO_TOTAL_PINS 268
#define GPIO_PINS_PER_BLOCK 32
#define GPIO_BLOCKS_COUNT (GPIO_TOTAL_PINS/GPIO_PINS_PER_BLOCK + 1)
#define GPIO_BLOCK(pin) (((pin + GPIO_PINS_PER_BLOCK) >> 5) - 1)
#define GPIO_PIN_WITHIN_BLOCK(pin) ((pin)%(GPIO_PINS_PER_BLOCK))
/* Register in the logic block */
#define DB8500_GPIO_DAT 0x00
#define DB8500_GPIO_DATS 0x04
#define DB8500_GPIO_DATC 0x08
#define DB8500_GPIO_PDIS 0x0c
#define DB8500_GPIO_DIR 0x10
#define DB8500_GPIO_DIRS 0x14
#define DB8500_GPIO_DIRC 0x18
#define DB8500_GPIO_SLPC 0x1c
#define DB8500_GPIO_AFSLA 0x20
#define DB8500_GPIO_AFSLB 0x24
#define DB8500_GPIO_RIMSC 0x40
#define DB8500_GPIO_FIMSC 0x44
#define DB8500_GPIO_IS 0x48
#define DB8500_GPIO_IC 0x4c
#define DB8500_GPIO_RWIMSC 0x50
#define DB8500_GPIO_FWIMSC 0x54
#define DB8500_GPIO_WKS 0x58
static void __iomem *get_gpio_addr(unsigned gpio)
{
/* Our list of GPIO chips */
static void __iomem *gpio_addrs[GPIO_BLOCKS_COUNT] = {
IO_ADDR(CFG_GPIO_0_BASE),
IO_ADDR(CFG_GPIO_1_BASE),
IO_ADDR(CFG_GPIO_2_BASE),
IO_ADDR(CFG_GPIO_3_BASE),
IO_ADDR(CFG_GPIO_4_BASE),
IO_ADDR(CFG_GPIO_5_BASE),
IO_ADDR(CFG_GPIO_6_BASE),
IO_ADDR(CFG_GPIO_7_BASE),
IO_ADDR(CFG_GPIO_8_BASE)
};
return gpio_addrs[GPIO_BLOCK(gpio)];
}
static unsigned get_gpio_offset(unsigned gpio)
{
return GPIO_PIN_WITHIN_BLOCK(gpio);
}
/* Can only be called from config_pin. Don't configure alt-mode directly */
static void gpio_set_mode(unsigned gpio, enum db8500_gpio_alt mode)
{
void __iomem *addr = get_gpio_addr(gpio);
unsigned offset = get_gpio_offset(gpio);
u32 bit = 1 << offset;
u32 afunc, bfunc;
afunc = readl(addr + DB8500_GPIO_AFSLA) & ~bit;
bfunc = readl(addr + DB8500_GPIO_AFSLB) & ~bit;
if (mode & DB8500_GPIO_ALT_A)
afunc |= bit;
if (mode & DB8500_GPIO_ALT_B)
bfunc |= bit;
writel(afunc, addr + DB8500_GPIO_AFSLA);
writel(bfunc, addr + DB8500_GPIO_AFSLB);
}
/**
* db8500_gpio_set_pull() - enable/disable pull up/down on a gpio
* @gpio: pin number
* @pull: one of DB8500_GPIO_PULL_DOWN, DB8500_GPIO_PULL_UP,
* and DB8500_GPIO_PULL_NONE
*
* Enables/disables pull up/down on a specified pin. This only takes effect if
* the pin is configured as an input (either explicitly or by the alternate
* function).
*
* NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
* configured as an input. Otherwise, due to the way the controller registers
* work, this function will change the value output on the pin.
*/
void db8500_gpio_set_pull(unsigned gpio, enum db8500_gpio_pull pull)
{
void __iomem *addr = get_gpio_addr(gpio);
unsigned offset = get_gpio_offset(gpio);
u32 bit = 1 << offset;
u32 pdis;
pdis = readl(addr + DB8500_GPIO_PDIS);
if (pull == DB8500_GPIO_PULL_NONE)
pdis |= bit;
else
pdis &= ~bit;
writel(pdis, addr + DB8500_GPIO_PDIS);
if (pull == DB8500_GPIO_PULL_UP)
writel(bit, addr + DB8500_GPIO_DATS);
else if (pull == DB8500_GPIO_PULL_DOWN)
writel(bit, addr + DB8500_GPIO_DATC);
}
void db8500_gpio_make_input(unsigned gpio)
{
void __iomem *addr = get_gpio_addr(gpio);
unsigned offset = get_gpio_offset(gpio);
writel(1 << offset, addr + DB8500_GPIO_DIRC);
}
int db8500_gpio_get_input(unsigned gpio)
{
void __iomem *addr = get_gpio_addr(gpio);
unsigned offset = get_gpio_offset(gpio);
u32 bit = 1 << offset;
printf("db8500_gpio_get_input gpio=%u addr=%p offset=%u bit=%#x\n",
gpio, addr, offset, bit);
return (readl(addr + DB8500_GPIO_DAT) & bit) != 0;
}
void db8500_gpio_make_output(unsigned gpio, int val)
{
void __iomem *addr = get_gpio_addr(gpio);
unsigned offset = get_gpio_offset(gpio);
writel(1 << offset, addr + DB8500_GPIO_DIRS);
db8500_gpio_set_output(gpio, val);
}
void db8500_gpio_set_output(unsigned gpio, int val)
{
void __iomem *addr = get_gpio_addr(gpio);
unsigned offset = get_gpio_offset(gpio);
if (val)
writel(1 << offset, addr + DB8500_GPIO_DATS);
else
writel(1 << offset, addr + DB8500_GPIO_DATC);
}
/**
* config_pin - configure a pin's mux attributes
* @cfg: pin configuration
*
* Configures a pin's mode (alternate function or GPIO), its pull up status,
* and its sleep mode based on the specified configuration. The @cfg is
* usually one of the SoC specific macros defined in mach/<soc>-pins.h. These
* are constructed using, and can be further enhanced with, the macros in
* plat/pincfg.h.
*
* If a pin's mode is set to GPIO, it is configured as an input to avoid
* side-effects. The gpio can be manipulated later using standard GPIO API
* calls.
*/
static void config_pin(unsigned long cfg)
{
int pin = PIN_NUM(cfg);
int pull = PIN_PULL(cfg);
int af = PIN_ALT(cfg);
int output = PIN_DIR(cfg);
int val = PIN_VAL(cfg);
if (output)
db8500_gpio_make_output(pin, val);
else {
db8500_gpio_make_input(pin);
db8500_gpio_set_pull(pin, pull);
}
gpio_set_mode(pin, af);
}
/**
* db8500_config_pins - configure several pins at once
* @cfgs: array of pin configurations
* @num: number of elments in the array
*
* Configures several pins using config_pin(). Refer to that function for
* further information.
*/
void db8500_gpio_config_pins(unsigned long *cfgs, size_t num)
{
size_t i;
for (i = 0; i < num; i++)
config_pin(cfgs[i]);
}