642 lines
15 KiB
C
642 lines
15 KiB
C
/*
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* File: arch/blackfin/kernel/bfin_gpio.c
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* Based on:
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* Author: Michael Hennerich (hennerich@blackfin.uclinux.org)
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*
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* Created:
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* Description: GPIO Abstraction Layer
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*
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* Modified:
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* Copyright 2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Number BF537/6/4 BF561 BF533/2/1
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*
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* GPIO_0 PF0 PF0 PF0
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* GPIO_1 PF1 PF1 PF1
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* GPIO_2 PF2 PF2 PF2
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* GPIO_3 PF3 PF3 PF3
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* GPIO_4 PF4 PF4 PF4
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* GPIO_5 PF5 PF5 PF5
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* GPIO_6 PF6 PF6 PF6
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* GPIO_7 PF7 PF7 PF7
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* GPIO_8 PF8 PF8 PF8
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* GPIO_9 PF9 PF9 PF9
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* GPIO_10 PF10 PF10 PF10
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* GPIO_11 PF11 PF11 PF11
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* GPIO_12 PF12 PF12 PF12
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* GPIO_13 PF13 PF13 PF13
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* GPIO_14 PF14 PF14 PF14
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* GPIO_15 PF15 PF15 PF15
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* GPIO_16 PG0 PF16
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* GPIO_17 PG1 PF17
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* GPIO_18 PG2 PF18
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* GPIO_19 PG3 PF19
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* GPIO_20 PG4 PF20
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* GPIO_21 PG5 PF21
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* GPIO_22 PG6 PF22
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* GPIO_23 PG7 PF23
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* GPIO_24 PG8 PF24
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* GPIO_25 PG9 PF25
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* GPIO_26 PG10 PF26
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* GPIO_27 PG11 PF27
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* GPIO_28 PG12 PF28
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* GPIO_29 PG13 PF29
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* GPIO_30 PG14 PF30
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* GPIO_31 PG15 PF31
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* GPIO_32 PH0 PF32
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* GPIO_33 PH1 PF33
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* GPIO_34 PH2 PF34
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* GPIO_35 PH3 PF35
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* GPIO_36 PH4 PF36
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* GPIO_37 PH5 PF37
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* GPIO_38 PH6 PF38
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* GPIO_39 PH7 PF39
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* GPIO_40 PH8 PF40
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* GPIO_41 PH9 PF41
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* GPIO_42 PH10 PF42
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* GPIO_43 PH11 PF43
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* GPIO_44 PH12 PF44
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* GPIO_45 PH13 PF45
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* GPIO_46 PH14 PF46
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* GPIO_47 PH15 PF47
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <asm/blackfin.h>
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#include <asm/gpio.h>
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#include <linux/irq.h>
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#ifdef BF533_FAMILY
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static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
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(struct gpio_port_t *) FIO_FLAG_D,
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};
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#endif
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#ifdef BF537_FAMILY
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static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
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(struct gpio_port_t *) PORTFIO,
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(struct gpio_port_t *) PORTGIO,
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(struct gpio_port_t *) PORTHIO,
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};
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static unsigned short *port_fer[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
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(unsigned short *) PORTF_FER,
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(unsigned short *) PORTG_FER,
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(unsigned short *) PORTH_FER,
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};
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#endif
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#ifdef BF561_FAMILY
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static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
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(struct gpio_port_t *) FIO0_FLAG_D,
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(struct gpio_port_t *) FIO1_FLAG_D,
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(struct gpio_port_t *) FIO2_FLAG_D,
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};
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#endif
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static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
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#ifdef CONFIG_PM
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static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
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static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS];
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static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)];
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#ifdef BF533_FAMILY
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static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB};
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#endif
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#ifdef BF537_FAMILY
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static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX};
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#endif
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#ifdef BF561_FAMILY
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static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
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#endif
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#endif /* CONFIG_PM */
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inline int check_gpio(unsigned short gpio)
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{
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if (gpio >= MAX_BLACKFIN_GPIOS)
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return -EINVAL;
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return 0;
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}
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#ifdef BF537_FAMILY
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static void port_setup(unsigned short gpio, unsigned short usage)
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{
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if (usage == GPIO_USAGE) {
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if (*port_fer[gpio_bank(gpio)] & gpio_bit(gpio))
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printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral "
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"usage and GPIO %d detected!\n", gpio);
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*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
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} else
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*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
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SSYNC();
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}
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#else
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# define port_setup(...) do { } while (0)
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#endif
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static void default_gpio(unsigned short gpio)
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{
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unsigned short bank, bitmask;
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bank = gpio_bank(gpio);
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bitmask = gpio_bit(gpio);
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gpio_bankb[bank]->maska_clear = bitmask;
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gpio_bankb[bank]->maskb_clear = bitmask;
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SSYNC();
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gpio_bankb[bank]->inen &= ~bitmask;
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gpio_bankb[bank]->dir &= ~bitmask;
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gpio_bankb[bank]->polar &= ~bitmask;
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gpio_bankb[bank]->both &= ~bitmask;
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gpio_bankb[bank]->edge &= ~bitmask;
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}
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static int __init bfin_gpio_init(void)
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{
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int i;
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printk(KERN_INFO "Blackfin GPIO Controller\n");
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for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE)
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reserved_map[gpio_bank(i)] = 0;
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#if defined(BF537_FAMILY) && (defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
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# if defined(CONFIG_BFIN_MAC_RMII)
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reserved_map[gpio_bank(PORT_H)] = 0xC373;
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# else
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reserved_map[gpio_bank(PORT_H)] = 0xFFFF;
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# endif
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#endif
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return 0;
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}
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arch_initcall(bfin_gpio_init);
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/***********************************************************
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*
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* FUNCTIONS: Blackfin General Purpose Ports Access Functions
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*
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* INPUTS/OUTPUTS:
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* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
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*
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*
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* DESCRIPTION: These functions abstract direct register access
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* to Blackfin processor General Purpose
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* Ports Regsiters
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*
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* CAUTION: These functions do not belong to the GPIO Driver API
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*************************************************************
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* MODIFICATION HISTORY :
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**************************************************************/
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/* Set a specific bit */
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#define SET_GPIO(name) \
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void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
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{ \
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unsigned long flags; \
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BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
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local_irq_save(flags); \
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if (arg) \
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gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
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else \
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gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
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local_irq_restore(flags); \
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} \
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EXPORT_SYMBOL(set_gpio_ ## name);
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SET_GPIO(dir)
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SET_GPIO(inen)
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SET_GPIO(polar)
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SET_GPIO(edge)
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SET_GPIO(both)
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#define SET_GPIO_SC(name) \
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void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
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{ \
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BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
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if (arg) \
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gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
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else \
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gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
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} \
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EXPORT_SYMBOL(set_gpio_ ## name);
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SET_GPIO_SC(maska)
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SET_GPIO_SC(maskb)
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#if defined(ANOMALY_05000311)
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void set_gpio_data(unsigned short gpio, unsigned short arg)
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{
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unsigned long flags;
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BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
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local_irq_save(flags);
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if (arg)
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gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
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else
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gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
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bfin_read_CHIPID();
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(set_gpio_data);
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#else
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SET_GPIO_SC(data)
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#endif
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#if defined(ANOMALY_05000311)
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void set_gpio_toggle(unsigned short gpio)
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{
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unsigned long flags;
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BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
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local_irq_save(flags);
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gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
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bfin_read_CHIPID();
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local_irq_restore(flags);
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}
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#else
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void set_gpio_toggle(unsigned short gpio)
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{
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BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
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gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
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}
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#endif
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EXPORT_SYMBOL(set_gpio_toggle);
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/*Set current PORT date (16-bit word)*/
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#define SET_GPIO_P(name) \
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void set_gpiop_ ## name(unsigned short gpio, unsigned short arg) \
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{ \
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gpio_bankb[gpio_bank(gpio)]->name = arg; \
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} \
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EXPORT_SYMBOL(set_gpiop_ ## name);
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SET_GPIO_P(dir)
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SET_GPIO_P(inen)
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SET_GPIO_P(polar)
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SET_GPIO_P(edge)
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SET_GPIO_P(both)
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SET_GPIO_P(maska)
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SET_GPIO_P(maskb)
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#if defined(ANOMALY_05000311)
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void set_gpiop_data(unsigned short gpio, unsigned short arg)
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{
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unsigned long flags;
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local_irq_save(flags);
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gpio_bankb[gpio_bank(gpio)]->data = arg;
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bfin_read_CHIPID();
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(set_gpiop_data);
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#else
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SET_GPIO_P(data)
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#endif
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/* Get a specific bit */
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#define GET_GPIO(name) \
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unsigned short get_gpio_ ## name(unsigned short gpio) \
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{ \
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return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
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} \
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EXPORT_SYMBOL(get_gpio_ ## name);
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GET_GPIO(dir)
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GET_GPIO(inen)
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GET_GPIO(polar)
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GET_GPIO(edge)
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GET_GPIO(both)
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GET_GPIO(maska)
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GET_GPIO(maskb)
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#if defined(ANOMALY_05000311)
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unsigned short get_gpio_data(unsigned short gpio)
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{
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unsigned long flags;
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unsigned short ret;
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BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
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local_irq_save(flags);
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ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
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bfin_read_CHIPID();
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local_irq_restore(flags);
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return ret;
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}
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EXPORT_SYMBOL(get_gpio_data);
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#else
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GET_GPIO(data)
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#endif
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/*Get current PORT date (16-bit word)*/
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#define GET_GPIO_P(name) \
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unsigned short get_gpiop_ ## name(unsigned short gpio) \
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{ \
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return (gpio_bankb[gpio_bank(gpio)]->name);\
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} \
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EXPORT_SYMBOL(get_gpiop_ ## name);
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GET_GPIO_P(dir)
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GET_GPIO_P(inen)
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GET_GPIO_P(polar)
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GET_GPIO_P(edge)
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GET_GPIO_P(both)
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GET_GPIO_P(maska)
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GET_GPIO_P(maskb)
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#if defined(ANOMALY_05000311)
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unsigned short get_gpiop_data(unsigned short gpio)
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{
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unsigned long flags;
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unsigned short ret;
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local_irq_save(flags);
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ret = gpio_bankb[gpio_bank(gpio)]->data;
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bfin_read_CHIPID();
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local_irq_restore(flags);
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return ret;
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}
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EXPORT_SYMBOL(get_gpiop_data);
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#else
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GET_GPIO_P(data)
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#endif
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#ifdef CONFIG_PM
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/***********************************************************
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*
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* FUNCTIONS: Blackfin PM Setup API
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*
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* INPUTS/OUTPUTS:
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* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
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* type -
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* PM_WAKE_RISING
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* PM_WAKE_FALLING
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* PM_WAKE_HIGH
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* PM_WAKE_LOW
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* PM_WAKE_BOTH_EDGES
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*
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* DESCRIPTION: Blackfin PM Driver API
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*
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* CAUTION:
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*************************************************************
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* MODIFICATION HISTORY :
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**************************************************************/
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int gpio_pm_wakeup_request(unsigned short gpio, unsigned char type)
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{
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unsigned long flags;
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if ((check_gpio(gpio) < 0) || !type)
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return -EINVAL;
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local_irq_save(flags);
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wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
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wakeup_flags_map[gpio] = type;
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local_irq_restore(flags);
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return 0;
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}
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EXPORT_SYMBOL(gpio_pm_wakeup_request);
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void gpio_pm_wakeup_free(unsigned short gpio)
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{
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unsigned long flags;
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if (check_gpio(gpio) < 0)
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return;
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local_irq_save(flags);
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wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gpio_pm_wakeup_free);
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static int bfin_gpio_wakeup_type(unsigned short gpio, unsigned char type)
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{
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port_setup(gpio, GPIO_USAGE);
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set_gpio_dir(gpio, 0);
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set_gpio_inen(gpio, 1);
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if (type & (PM_WAKE_RISING | PM_WAKE_FALLING))
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set_gpio_edge(gpio, 1);
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else
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set_gpio_edge(gpio, 0);
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if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES))
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set_gpio_both(gpio, 1);
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else
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set_gpio_both(gpio, 0);
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if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW)))
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set_gpio_polar(gpio, 1);
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else
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set_gpio_polar(gpio, 0);
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SSYNC();
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return 0;
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}
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u32 gpio_pm_setup(void)
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{
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u32 sic_iwr = 0;
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u16 bank, mask, i, gpio;
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for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
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mask = wakeup_map[gpio_bank(i)];
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bank = gpio_bank(i);
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gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb;
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gpio_bankb[bank]->maskb = 0;
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if (mask) {
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#ifdef BF537_FAMILY
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gpio_bank_saved[bank].fer = *port_fer[bank];
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#endif
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gpio_bank_saved[bank].inen = gpio_bankb[bank]->inen;
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gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
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gpio_bank_saved[bank].dir = gpio_bankb[bank]->dir;
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gpio_bank_saved[bank].edge = gpio_bankb[bank]->edge;
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gpio_bank_saved[bank].both = gpio_bankb[bank]->both;
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gpio_bank_saved[bank].reserved = reserved_map[bank];
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gpio = i;
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while (mask) {
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if (mask & 1) {
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reserved_map[gpio_bank(gpio)] |=
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gpio_bit(gpio);
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bfin_gpio_wakeup_type(gpio,
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wakeup_flags_map[gpio]);
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set_gpio_data(gpio, 0); /*Clear*/
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}
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gpio++;
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mask >>= 1;
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}
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sic_iwr |= 1 <<
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(sic_iwr_irqs[bank] - (IRQ_CORETMR + 1));
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gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
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}
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}
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if (sic_iwr)
|
|
return sic_iwr;
|
|
else
|
|
return IWR_ENABLE_ALL;
|
|
}
|
|
|
|
void gpio_pm_restore(void)
|
|
{
|
|
u16 bank, mask, i;
|
|
|
|
for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
|
|
mask = wakeup_map[gpio_bank(i)];
|
|
bank = gpio_bank(i);
|
|
|
|
if (mask) {
|
|
#ifdef BF537_FAMILY
|
|
*port_fer[bank] = gpio_bank_saved[bank].fer;
|
|
#endif
|
|
gpio_bankb[bank]->inen = gpio_bank_saved[bank].inen;
|
|
gpio_bankb[bank]->dir = gpio_bank_saved[bank].dir;
|
|
gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
|
|
gpio_bankb[bank]->edge = gpio_bank_saved[bank].edge;
|
|
gpio_bankb[bank]->both = gpio_bank_saved[bank].both;
|
|
|
|
reserved_map[bank] = gpio_bank_saved[bank].reserved;
|
|
|
|
}
|
|
|
|
gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
/***********************************************************
|
|
*
|
|
* FUNCTIONS: Blackfin GPIO Driver
|
|
*
|
|
* INPUTS/OUTPUTS:
|
|
* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
|
|
*
|
|
*
|
|
* DESCRIPTION: Blackfin GPIO Driver API
|
|
*
|
|
* CAUTION:
|
|
*************************************************************
|
|
* MODIFICATION HISTORY :
|
|
**************************************************************/
|
|
|
|
int gpio_request(unsigned short gpio, const char *label)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (check_gpio(gpio) < 0)
|
|
return -EINVAL;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (unlikely(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
|
|
printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
|
|
dump_stack();
|
|
local_irq_restore(flags);
|
|
return -EBUSY;
|
|
}
|
|
reserved_map[gpio_bank(gpio)] |= gpio_bit(gpio);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
port_setup(gpio, GPIO_USAGE);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(gpio_request);
|
|
|
|
void gpio_free(unsigned short gpio)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (check_gpio(gpio) < 0)
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (unlikely(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
|
|
printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
|
|
dump_stack();
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
|
|
default_gpio(gpio);
|
|
|
|
reserved_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(gpio_free);
|
|
|
|
void gpio_direction_input(unsigned short gpio)
|
|
{
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
|
|
|
|
local_irq_save(flags);
|
|
gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
|
|
gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(gpio_direction_input);
|
|
|
|
void gpio_direction_output(unsigned short gpio)
|
|
{
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
|
|
|
|
local_irq_save(flags);
|
|
gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
|
|
gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(gpio_direction_output);
|