1 /* arch/arm/plat-s3c64xx/gpiolib.c
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2008 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
8 * S3C64XX - GPIOlib support
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/kernel.h>
16 #include <linux/irq.h>
20 #include <mach/gpio.h>
21 #include <mach/gpio-core.h>
23 #include <plat/gpio-cfg.h>
24 #include <plat/gpio-cfg-helpers.h>
25 #include <plat/regs-gpio.h>
29 * Bank GPIOs Style SlpCon ExtInt Group
40 * K 16 4Bit[2] No None
41 * L 15 4Bit[2] No None
42 * M 6 4Bit No IRQ_EINT
43 * N 16 2Bit No IRQ_EINT
48 * [1] BANKF pins 14,15 do not form part of the external interrupt sources
49 * [2] BANK has two control registers, GPxCON0 and GPxCON1
52 #define OFF_GPCON (0x00)
53 #define OFF_GPDAT (0x04)
55 #define con_4bit_shift(__off) ((__off) * 4)
58 #define gpio_dbg(x...) do { } while(0)
60 #define gpio_dbg(x...) printk(KERN_DEBUG x)
63 /* The s3c64xx_gpiolib_4bit routines are to control the gpio banks where
64 * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
67 * base + 0x00: Control register, 4 bits per gpio
68 * gpio n: 4 bits starting at (4*n)
69 * 0000 = input, 0001 = output, others mean special-function
70 * base + 0x04: Data register, 1 bit per gpio
73 * Note, since the data register is one bit per gpio and is at base + 0x4
74 * we can use s3c_gpiolib_get and s3c_gpiolib_set to change the state of
78 static int s3c64xx_gpiolib_4bit_input(struct gpio_chip *chip, unsigned offset)
80 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
81 void __iomem *base = ourchip->base;
84 con = __raw_readl(base + OFF_GPCON);
85 con &= ~(0xf << con_4bit_shift(offset));
86 __raw_writel(con, base + OFF_GPCON);
88 gpio_dbg("%s: %p: CON now %08lx\n", __func__, base, con);
93 static int s3c64xx_gpiolib_4bit_output(struct gpio_chip *chip,
94 unsigned offset, int value)
96 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
97 void __iomem *base = ourchip->base;
101 con = __raw_readl(base + OFF_GPCON);
102 con &= ~(0xf << con_4bit_shift(offset));
103 con |= 0x1 << con_4bit_shift(offset);
105 dat = __raw_readl(base + OFF_GPDAT);
109 dat &= ~(1 << offset);
111 __raw_writel(dat, base + OFF_GPDAT);
112 __raw_writel(con, base + OFF_GPCON);
113 __raw_writel(dat, base + OFF_GPDAT);
115 gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
120 /* The next set of routines are for the case where the GPIO configuration
121 * registers are 4 bits per GPIO but there is more than one register (the
122 * bank has more than 8 GPIOs.
124 * This case is the similar to the 4 bit case, but the registers are as
127 * base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
128 * gpio n: 4 bits starting at (4*n)
129 * 0000 = input, 0001 = output, others mean special-function
130 * base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
131 * gpio n: 4 bits starting at (4*n)
132 * 0000 = input, 0001 = output, others mean special-function
133 * base + 0x08: Data register, 1 bit per gpio
136 * To allow us to use the s3c_gpiolib_get and s3c_gpiolib_set routines we
137 * store the 'base + 0x4' address so that these routines see the data
138 * register at ourchip->base + 0x04.
141 static int s3c64xx_gpiolib_4bit2_input(struct gpio_chip *chip, unsigned offset)
143 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
144 void __iomem *base = ourchip->base;
145 void __iomem *regcon = base;
153 con = __raw_readl(regcon);
154 con &= ~(0xf << con_4bit_shift(offset));
155 __raw_writel(con, regcon);
157 gpio_dbg("%s: %p: CON %08lx\n", __func__, base, con);
163 static int s3c64xx_gpiolib_4bit2_output(struct gpio_chip *chip,
164 unsigned offset, int value)
166 struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
167 void __iomem *base = ourchip->base;
168 void __iomem *regcon = base;
177 con = __raw_readl(regcon);
178 con &= ~(0xf << con_4bit_shift(offset));
179 con |= 0x1 << con_4bit_shift(offset);
181 dat = __raw_readl(base + OFF_GPDAT);
185 dat &= ~(1 << offset);
187 __raw_writel(dat, base + OFF_GPDAT);
188 __raw_writel(con, regcon);
189 __raw_writel(dat, base + OFF_GPDAT);
191 gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
196 static struct s3c_gpio_cfg gpio_4bit_cfg_noint = {
197 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
198 .set_pull = s3c_gpio_setpull_updown,
199 .get_pull = s3c_gpio_getpull_updown,
202 static struct s3c_gpio_cfg gpio_4bit_cfg_eint0111 = {
204 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
205 .set_pull = s3c_gpio_setpull_updown,
206 .get_pull = s3c_gpio_getpull_updown,
209 static struct s3c_gpio_cfg gpio_4bit_cfg_eint0011 = {
211 .set_config = s3c_gpio_setcfg_s3c64xx_4bit,
212 .set_pull = s3c_gpio_setpull_updown,
213 .get_pull = s3c_gpio_getpull_updown,
216 static struct s3c_gpio_chip gpio_4bit[] = {
218 .base = S3C64XX_GPA_BASE,
219 .config = &gpio_4bit_cfg_eint0111,
221 .base = S3C64XX_GPA(0),
222 .ngpio = S3C64XX_GPIO_A_NR,
226 .base = S3C64XX_GPB_BASE,
227 .config = &gpio_4bit_cfg_eint0111,
229 .base = S3C64XX_GPB(0),
230 .ngpio = S3C64XX_GPIO_B_NR,
234 .base = S3C64XX_GPC_BASE,
235 .config = &gpio_4bit_cfg_eint0111,
237 .base = S3C64XX_GPC(0),
238 .ngpio = S3C64XX_GPIO_C_NR,
242 .base = S3C64XX_GPD_BASE,
243 .config = &gpio_4bit_cfg_eint0111,
245 .base = S3C64XX_GPD(0),
246 .ngpio = S3C64XX_GPIO_D_NR,
250 .base = S3C64XX_GPE_BASE,
251 .config = &gpio_4bit_cfg_noint,
253 .base = S3C64XX_GPE(0),
254 .ngpio = S3C64XX_GPIO_E_NR,
258 .base = S3C64XX_GPG_BASE,
259 .config = &gpio_4bit_cfg_eint0111,
261 .base = S3C64XX_GPG(0),
262 .ngpio = S3C64XX_GPIO_G_NR,
266 .base = S3C64XX_GPM_BASE,
267 .config = &gpio_4bit_cfg_eint0011,
269 .base = S3C64XX_GPM(0),
270 .ngpio = S3C64XX_GPIO_M_NR,
276 static struct s3c_gpio_chip gpio_4bit2[] = {
278 .base = S3C64XX_GPH_BASE + 0x4,
279 .config = &gpio_4bit_cfg_eint0111,
281 .base = S3C64XX_GPH(0),
282 .ngpio = S3C64XX_GPIO_H_NR,
286 .base = S3C64XX_GPK_BASE + 0x4,
287 .config = &gpio_4bit_cfg_noint,
289 .base = S3C64XX_GPK(0),
290 .ngpio = S3C64XX_GPIO_K_NR,
294 .base = S3C64XX_GPL_BASE + 0x4,
295 .config = &gpio_4bit_cfg_eint0011,
297 .base = S3C64XX_GPL(0),
298 .ngpio = S3C64XX_GPIO_L_NR,
304 static struct s3c_gpio_cfg gpio_2bit_cfg_noint = {
305 .set_config = s3c_gpio_setcfg_s3c24xx,
306 .set_pull = s3c_gpio_setpull_updown,
307 .get_pull = s3c_gpio_getpull_updown,
310 static struct s3c_gpio_cfg gpio_2bit_cfg_eint10 = {
312 .set_config = s3c_gpio_setcfg_s3c24xx,
313 .set_pull = s3c_gpio_setpull_updown,
314 .get_pull = s3c_gpio_getpull_updown,
317 static struct s3c_gpio_cfg gpio_2bit_cfg_eint11 = {
319 .set_config = s3c_gpio_setcfg_s3c24xx,
320 .set_pull = s3c_gpio_setpull_updown,
321 .get_pull = s3c_gpio_getpull_updown,
324 int s3c64xx_gpio2int_gpn(struct gpio_chip *chip, unsigned pin)
326 return IRQ_EINT(0) + pin;
329 static struct s3c_gpio_chip gpio_2bit[] = {
331 .base = S3C64XX_GPF_BASE,
332 .config = &gpio_2bit_cfg_eint11,
334 .base = S3C64XX_GPF(0),
335 .ngpio = S3C64XX_GPIO_F_NR,
339 .base = S3C64XX_GPI_BASE,
340 .config = &gpio_2bit_cfg_noint,
342 .base = S3C64XX_GPI(0),
343 .ngpio = S3C64XX_GPIO_I_NR,
347 .base = S3C64XX_GPJ_BASE,
348 .config = &gpio_2bit_cfg_noint,
350 .base = S3C64XX_GPJ(0),
351 .ngpio = S3C64XX_GPIO_J_NR,
355 .base = S3C64XX_GPN_BASE,
356 .config = &gpio_2bit_cfg_eint10,
358 .base = S3C64XX_GPN(0),
359 .ngpio = S3C64XX_GPIO_N_NR,
361 .to_irq = s3c64xx_gpio2int_gpn,
364 .base = S3C64XX_GPO_BASE,
365 .config = &gpio_2bit_cfg_eint11,
367 .base = S3C64XX_GPO(0),
368 .ngpio = S3C64XX_GPIO_O_NR,
372 .base = S3C64XX_GPP_BASE,
373 .config = &gpio_2bit_cfg_eint11,
375 .base = S3C64XX_GPP(0),
376 .ngpio = S3C64XX_GPIO_P_NR,
380 .base = S3C64XX_GPQ_BASE,
381 .config = &gpio_2bit_cfg_eint11,
383 .base = S3C64XX_GPQ(0),
384 .ngpio = S3C64XX_GPIO_Q_NR,
390 static __init void s3c64xx_gpiolib_add_4bit(struct s3c_gpio_chip *chip)
392 chip->chip.direction_input = s3c64xx_gpiolib_4bit_input;
393 chip->chip.direction_output = s3c64xx_gpiolib_4bit_output;
394 chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
397 static __init void s3c64xx_gpiolib_add_4bit2(struct s3c_gpio_chip *chip)
399 chip->chip.direction_input = s3c64xx_gpiolib_4bit2_input;
400 chip->chip.direction_output = s3c64xx_gpiolib_4bit2_output;
401 chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
404 static __init void s3c64xx_gpiolib_add_2bit(struct s3c_gpio_chip *chip)
406 chip->pm = __gpio_pm(&s3c_gpio_pm_2bit);
409 static __init void s3c64xx_gpiolib_add(struct s3c_gpio_chip *chips,
411 void (*fn)(struct s3c_gpio_chip *))
413 for (; nr_chips > 0; nr_chips--, chips++) {
416 s3c_gpiolib_add(chips);
420 static __init int s3c64xx_gpiolib_init(void)
422 s3c64xx_gpiolib_add(gpio_4bit, ARRAY_SIZE(gpio_4bit),
423 s3c64xx_gpiolib_add_4bit);
425 s3c64xx_gpiolib_add(gpio_4bit2, ARRAY_SIZE(gpio_4bit2),
426 s3c64xx_gpiolib_add_4bit2);
428 s3c64xx_gpiolib_add(gpio_2bit, ARRAY_SIZE(gpio_2bit),
429 s3c64xx_gpiolib_add_2bit);
434 core_initcall(s3c64xx_gpiolib_init);