184dee301SMathieu J. Poirier /*
284dee301SMathieu J. Poirier * Code ported from Nomadik GPIO driver in ST-Ericsson Linux kernel code.
384dee301SMathieu J. Poirier * The purpose is that GPIO config found in kernel should work by simply
4a187559eSBin Meng * copy-paste it to U-Boot.
584dee301SMathieu J. Poirier *
684dee301SMathieu J. Poirier * Original Linux authors:
784dee301SMathieu J. Poirier * Copyright (C) 2008,2009 STMicroelectronics
884dee301SMathieu J. Poirier * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
984dee301SMathieu J. Poirier * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
1084dee301SMathieu J. Poirier *
11a187559eSBin Meng * Ported to U-Boot by:
1284dee301SMathieu J. Poirier * Copyright (C) 2010 Joakim Axelsson <joakim.axelsson AT stericsson.com>
1384dee301SMathieu J. Poirier *
1484dee301SMathieu J. Poirier * This program is free software; you can redistribute it and/or modify
1584dee301SMathieu J. Poirier * it under the terms of the GNU General Public License version 2 as
1684dee301SMathieu J. Poirier * published by the Free Software Foundation.
1784dee301SMathieu J. Poirier */
1884dee301SMathieu J. Poirier
1984dee301SMathieu J. Poirier #include <common.h>
2084dee301SMathieu J. Poirier #include <asm/io.h>
2184dee301SMathieu J. Poirier
2284dee301SMathieu J. Poirier #include <asm/arch/db8500_gpio.h>
2384dee301SMathieu J. Poirier #include <asm/arch/db8500_pincfg.h>
2484dee301SMathieu J. Poirier #include <linux/compiler.h>
2584dee301SMathieu J. Poirier
2684dee301SMathieu J. Poirier #define IO_ADDR(x) (void *) (x)
2784dee301SMathieu J. Poirier
2884dee301SMathieu J. Poirier /*
2984dee301SMathieu J. Poirier * The GPIO module in the db8500 Systems-on-Chip is an
3084dee301SMathieu J. Poirier * AMBA device, managing 32 pins and alternate functions. The logic block
3184dee301SMathieu J. Poirier * is currently only used in the db8500.
3284dee301SMathieu J. Poirier */
3384dee301SMathieu J. Poirier
3484dee301SMathieu J. Poirier #define GPIO_TOTAL_PINS 268
3584dee301SMathieu J. Poirier #define GPIO_PINS_PER_BLOCK 32
3684dee301SMathieu J. Poirier #define GPIO_BLOCKS_COUNT (GPIO_TOTAL_PINS/GPIO_PINS_PER_BLOCK + 1)
3784dee301SMathieu J. Poirier #define GPIO_BLOCK(pin) (((pin + GPIO_PINS_PER_BLOCK) >> 5) - 1)
3884dee301SMathieu J. Poirier #define GPIO_PIN_WITHIN_BLOCK(pin) ((pin)%(GPIO_PINS_PER_BLOCK))
3984dee301SMathieu J. Poirier
4084dee301SMathieu J. Poirier /* Register in the logic block */
4184dee301SMathieu J. Poirier #define DB8500_GPIO_DAT 0x00
4284dee301SMathieu J. Poirier #define DB8500_GPIO_DATS 0x04
4384dee301SMathieu J. Poirier #define DB8500_GPIO_DATC 0x08
4484dee301SMathieu J. Poirier #define DB8500_GPIO_PDIS 0x0c
4584dee301SMathieu J. Poirier #define DB8500_GPIO_DIR 0x10
4684dee301SMathieu J. Poirier #define DB8500_GPIO_DIRS 0x14
4784dee301SMathieu J. Poirier #define DB8500_GPIO_DIRC 0x18
4884dee301SMathieu J. Poirier #define DB8500_GPIO_SLPC 0x1c
4984dee301SMathieu J. Poirier #define DB8500_GPIO_AFSLA 0x20
5084dee301SMathieu J. Poirier #define DB8500_GPIO_AFSLB 0x24
5184dee301SMathieu J. Poirier
5284dee301SMathieu J. Poirier #define DB8500_GPIO_RIMSC 0x40
5384dee301SMathieu J. Poirier #define DB8500_GPIO_FIMSC 0x44
5484dee301SMathieu J. Poirier #define DB8500_GPIO_IS 0x48
5584dee301SMathieu J. Poirier #define DB8500_GPIO_IC 0x4c
5684dee301SMathieu J. Poirier #define DB8500_GPIO_RWIMSC 0x50
5784dee301SMathieu J. Poirier #define DB8500_GPIO_FWIMSC 0x54
5884dee301SMathieu J. Poirier #define DB8500_GPIO_WKS 0x58
5984dee301SMathieu J. Poirier
get_gpio_addr(unsigned gpio)6084dee301SMathieu J. Poirier static void __iomem *get_gpio_addr(unsigned gpio)
6184dee301SMathieu J. Poirier {
6284dee301SMathieu J. Poirier /* Our list of GPIO chips */
6384dee301SMathieu J. Poirier static void __iomem *gpio_addrs[GPIO_BLOCKS_COUNT] = {
6484dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_0_BASE),
6584dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_1_BASE),
6684dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_2_BASE),
6784dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_3_BASE),
6884dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_4_BASE),
6984dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_5_BASE),
7084dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_6_BASE),
7184dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_7_BASE),
7284dee301SMathieu J. Poirier IO_ADDR(CFG_GPIO_8_BASE)
7384dee301SMathieu J. Poirier };
7484dee301SMathieu J. Poirier
7584dee301SMathieu J. Poirier return gpio_addrs[GPIO_BLOCK(gpio)];
7684dee301SMathieu J. Poirier }
7784dee301SMathieu J. Poirier
get_gpio_offset(unsigned gpio)7884dee301SMathieu J. Poirier static unsigned get_gpio_offset(unsigned gpio)
7984dee301SMathieu J. Poirier {
8084dee301SMathieu J. Poirier return GPIO_PIN_WITHIN_BLOCK(gpio);
8184dee301SMathieu J. Poirier }
8284dee301SMathieu J. Poirier
8384dee301SMathieu J. Poirier /* Can only be called from config_pin. Don't configure alt-mode directly */
gpio_set_mode(unsigned gpio,enum db8500_gpio_alt mode)8484dee301SMathieu J. Poirier static void gpio_set_mode(unsigned gpio, enum db8500_gpio_alt mode)
8584dee301SMathieu J. Poirier {
8684dee301SMathieu J. Poirier void __iomem *addr = get_gpio_addr(gpio);
8784dee301SMathieu J. Poirier unsigned offset = get_gpio_offset(gpio);
8884dee301SMathieu J. Poirier u32 bit = 1 << offset;
8984dee301SMathieu J. Poirier u32 afunc, bfunc;
9084dee301SMathieu J. Poirier
9184dee301SMathieu J. Poirier afunc = readl(addr + DB8500_GPIO_AFSLA) & ~bit;
9284dee301SMathieu J. Poirier bfunc = readl(addr + DB8500_GPIO_AFSLB) & ~bit;
9384dee301SMathieu J. Poirier if (mode & DB8500_GPIO_ALT_A)
9484dee301SMathieu J. Poirier afunc |= bit;
9584dee301SMathieu J. Poirier if (mode & DB8500_GPIO_ALT_B)
9684dee301SMathieu J. Poirier bfunc |= bit;
9784dee301SMathieu J. Poirier writel(afunc, addr + DB8500_GPIO_AFSLA);
9884dee301SMathieu J. Poirier writel(bfunc, addr + DB8500_GPIO_AFSLB);
9984dee301SMathieu J. Poirier }
10084dee301SMathieu J. Poirier
10184dee301SMathieu J. Poirier /**
10284dee301SMathieu J. Poirier * db8500_gpio_set_pull() - enable/disable pull up/down on a gpio
10384dee301SMathieu J. Poirier * @gpio: pin number
10484dee301SMathieu J. Poirier * @pull: one of DB8500_GPIO_PULL_DOWN, DB8500_GPIO_PULL_UP,
10584dee301SMathieu J. Poirier * and DB8500_GPIO_PULL_NONE
10684dee301SMathieu J. Poirier *
10784dee301SMathieu J. Poirier * Enables/disables pull up/down on a specified pin. This only takes effect if
10884dee301SMathieu J. Poirier * the pin is configured as an input (either explicitly or by the alternate
10984dee301SMathieu J. Poirier * function).
11084dee301SMathieu J. Poirier *
11184dee301SMathieu J. Poirier * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
11284dee301SMathieu J. Poirier * configured as an input. Otherwise, due to the way the controller registers
11384dee301SMathieu J. Poirier * work, this function will change the value output on the pin.
11484dee301SMathieu J. Poirier */
db8500_gpio_set_pull(unsigned gpio,enum db8500_gpio_pull pull)11584dee301SMathieu J. Poirier void db8500_gpio_set_pull(unsigned gpio, enum db8500_gpio_pull pull)
11684dee301SMathieu J. Poirier {
11784dee301SMathieu J. Poirier void __iomem *addr = get_gpio_addr(gpio);
11884dee301SMathieu J. Poirier unsigned offset = get_gpio_offset(gpio);
11984dee301SMathieu J. Poirier u32 bit = 1 << offset;
12084dee301SMathieu J. Poirier u32 pdis;
12184dee301SMathieu J. Poirier
12284dee301SMathieu J. Poirier pdis = readl(addr + DB8500_GPIO_PDIS);
12384dee301SMathieu J. Poirier if (pull == DB8500_GPIO_PULL_NONE)
12484dee301SMathieu J. Poirier pdis |= bit;
12584dee301SMathieu J. Poirier else
12684dee301SMathieu J. Poirier pdis &= ~bit;
12784dee301SMathieu J. Poirier writel(pdis, addr + DB8500_GPIO_PDIS);
12884dee301SMathieu J. Poirier
12984dee301SMathieu J. Poirier if (pull == DB8500_GPIO_PULL_UP)
13084dee301SMathieu J. Poirier writel(bit, addr + DB8500_GPIO_DATS);
13184dee301SMathieu J. Poirier else if (pull == DB8500_GPIO_PULL_DOWN)
13284dee301SMathieu J. Poirier writel(bit, addr + DB8500_GPIO_DATC);
13384dee301SMathieu J. Poirier }
13484dee301SMathieu J. Poirier
db8500_gpio_make_input(unsigned gpio)13584dee301SMathieu J. Poirier void db8500_gpio_make_input(unsigned gpio)
13684dee301SMathieu J. Poirier {
13784dee301SMathieu J. Poirier void __iomem *addr = get_gpio_addr(gpio);
13884dee301SMathieu J. Poirier unsigned offset = get_gpio_offset(gpio);
13984dee301SMathieu J. Poirier
14084dee301SMathieu J. Poirier writel(1 << offset, addr + DB8500_GPIO_DIRC);
14184dee301SMathieu J. Poirier }
14284dee301SMathieu J. Poirier
db8500_gpio_get_input(unsigned gpio)14384dee301SMathieu J. Poirier int db8500_gpio_get_input(unsigned gpio)
14484dee301SMathieu J. Poirier {
14584dee301SMathieu J. Poirier void __iomem *addr = get_gpio_addr(gpio);
14684dee301SMathieu J. Poirier unsigned offset = get_gpio_offset(gpio);
14784dee301SMathieu J. Poirier u32 bit = 1 << offset;
14884dee301SMathieu J. Poirier
14984dee301SMathieu J. Poirier printf("db8500_gpio_get_input gpio=%u addr=%p offset=%u bit=%#x\n",
15084dee301SMathieu J. Poirier gpio, addr, offset, bit);
15184dee301SMathieu J. Poirier
15284dee301SMathieu J. Poirier return (readl(addr + DB8500_GPIO_DAT) & bit) != 0;
15384dee301SMathieu J. Poirier }
15484dee301SMathieu J. Poirier
db8500_gpio_make_output(unsigned gpio,int val)15584dee301SMathieu J. Poirier void db8500_gpio_make_output(unsigned gpio, int val)
15684dee301SMathieu J. Poirier {
15784dee301SMathieu J. Poirier void __iomem *addr = get_gpio_addr(gpio);
15884dee301SMathieu J. Poirier unsigned offset = get_gpio_offset(gpio);
15984dee301SMathieu J. Poirier
16084dee301SMathieu J. Poirier writel(1 << offset, addr + DB8500_GPIO_DIRS);
16184dee301SMathieu J. Poirier db8500_gpio_set_output(gpio, val);
16284dee301SMathieu J. Poirier }
16384dee301SMathieu J. Poirier
db8500_gpio_set_output(unsigned gpio,int val)16484dee301SMathieu J. Poirier void db8500_gpio_set_output(unsigned gpio, int val)
16584dee301SMathieu J. Poirier {
16684dee301SMathieu J. Poirier void __iomem *addr = get_gpio_addr(gpio);
16784dee301SMathieu J. Poirier unsigned offset = get_gpio_offset(gpio);
16884dee301SMathieu J. Poirier
16984dee301SMathieu J. Poirier if (val)
17084dee301SMathieu J. Poirier writel(1 << offset, addr + DB8500_GPIO_DATS);
17184dee301SMathieu J. Poirier else
17284dee301SMathieu J. Poirier writel(1 << offset, addr + DB8500_GPIO_DATC);
17384dee301SMathieu J. Poirier }
17484dee301SMathieu J. Poirier
17584dee301SMathieu J. Poirier /**
17684dee301SMathieu J. Poirier * config_pin - configure a pin's mux attributes
177*7582ddceSRobert P. J. Day * @cfg: pin configuration
17884dee301SMathieu J. Poirier *
17984dee301SMathieu J. Poirier * Configures a pin's mode (alternate function or GPIO), its pull up status,
18084dee301SMathieu J. Poirier * and its sleep mode based on the specified configuration. The @cfg is
18184dee301SMathieu J. Poirier * usually one of the SoC specific macros defined in mach/<soc>-pins.h. These
18284dee301SMathieu J. Poirier * are constructed using, and can be further enhanced with, the macros in
18384dee301SMathieu J. Poirier * plat/pincfg.h.
18484dee301SMathieu J. Poirier *
18584dee301SMathieu J. Poirier * If a pin's mode is set to GPIO, it is configured as an input to avoid
18684dee301SMathieu J. Poirier * side-effects. The gpio can be manipulated later using standard GPIO API
18784dee301SMathieu J. Poirier * calls.
18884dee301SMathieu J. Poirier */
config_pin(unsigned long cfg)18984dee301SMathieu J. Poirier static void config_pin(unsigned long cfg)
19084dee301SMathieu J. Poirier {
19184dee301SMathieu J. Poirier int pin = PIN_NUM(cfg);
19284dee301SMathieu J. Poirier int pull = PIN_PULL(cfg);
19384dee301SMathieu J. Poirier int af = PIN_ALT(cfg);
19484dee301SMathieu J. Poirier int output = PIN_DIR(cfg);
19584dee301SMathieu J. Poirier int val = PIN_VAL(cfg);
19684dee301SMathieu J. Poirier
19784dee301SMathieu J. Poirier if (output)
19884dee301SMathieu J. Poirier db8500_gpio_make_output(pin, val);
19984dee301SMathieu J. Poirier else {
20084dee301SMathieu J. Poirier db8500_gpio_make_input(pin);
20184dee301SMathieu J. Poirier db8500_gpio_set_pull(pin, pull);
20284dee301SMathieu J. Poirier }
20384dee301SMathieu J. Poirier
20484dee301SMathieu J. Poirier gpio_set_mode(pin, af);
20584dee301SMathieu J. Poirier }
20684dee301SMathieu J. Poirier
20784dee301SMathieu J. Poirier /**
20884dee301SMathieu J. Poirier * db8500_config_pins - configure several pins at once
20984dee301SMathieu J. Poirier * @cfgs: array of pin configurations
21084dee301SMathieu J. Poirier * @num: number of elments in the array
21184dee301SMathieu J. Poirier *
21284dee301SMathieu J. Poirier * Configures several pins using config_pin(). Refer to that function for
21384dee301SMathieu J. Poirier * further information.
21484dee301SMathieu J. Poirier */
db8500_gpio_config_pins(unsigned long * cfgs,size_t num)21584dee301SMathieu J. Poirier void db8500_gpio_config_pins(unsigned long *cfgs, size_t num)
21684dee301SMathieu J. Poirier {
21784dee301SMathieu J. Poirier size_t i;
21884dee301SMathieu J. Poirier
21984dee301SMathieu J. Poirier for (i = 0; i < num; i++)
22084dee301SMathieu J. Poirier config_pin(cfgs[i]);
22184dee301SMathieu J. Poirier }
222