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Diffstat (limited to 'arch/powerpc/sysdev/qe_lib/gpio.c')
-rw-r--r--arch/powerpc/sysdev/qe_lib/gpio.c317
1 files changed, 0 insertions, 317 deletions
diff --git a/arch/powerpc/sysdev/qe_lib/gpio.c b/arch/powerpc/sysdev/qe_lib/gpio.c
deleted file mode 100644
index 521e67a..0000000
--- a/arch/powerpc/sysdev/qe_lib/gpio.c
+++ /dev/null
@@ -1,317 +0,0 @@
-/*
- * QUICC Engine GPIOs
- *
- * Copyright (c) MontaVista Software, Inc. 2008.
- *
- * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
- *
- * 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; either version 2 of the License, or (at your
- * option) any later version.
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_gpio.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-#include <asm/qe.h>
-
-struct qe_gpio_chip {
- struct of_mm_gpio_chip mm_gc;
- spinlock_t lock;
-
- unsigned long pin_flags[QE_PIO_PINS];
-#define QE_PIN_REQUESTED 0
-
- /* shadowed data register to clear/set bits safely */
- u32 cpdata;
-
- /* saved_regs used to restore dedicated functions */
- struct qe_pio_regs saved_regs;
-};
-
-static inline struct qe_gpio_chip *
-to_qe_gpio_chip(struct of_mm_gpio_chip *mm_gc)
-{
- return container_of(mm_gc, struct qe_gpio_chip, mm_gc);
-}
-
-static void qe_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
-{
- struct qe_gpio_chip *qe_gc = to_qe_gpio_chip(mm_gc);
- struct qe_pio_regs __iomem *regs = mm_gc->regs;
-
- qe_gc->cpdata = in_be32(&regs->cpdata);
- qe_gc->saved_regs.cpdata = qe_gc->cpdata;
- qe_gc->saved_regs.cpdir1 = in_be32(&regs->cpdir1);
- qe_gc->saved_regs.cpdir2 = in_be32(&regs->cpdir2);
- qe_gc->saved_regs.cppar1 = in_be32(&regs->cppar1);
- qe_gc->saved_regs.cppar2 = in_be32(&regs->cppar2);
- qe_gc->saved_regs.cpodr = in_be32(&regs->cpodr);
-}
-
-static int qe_gpio_get(struct gpio_chip *gc, unsigned int gpio)
-{
- struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
- struct qe_pio_regs __iomem *regs = mm_gc->regs;
- u32 pin_mask = 1 << (QE_PIO_PINS - 1 - gpio);
-
- return in_be32(&regs->cpdata) & pin_mask;
-}
-
-static void qe_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
-{
- struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
- struct qe_gpio_chip *qe_gc = to_qe_gpio_chip(mm_gc);
- struct qe_pio_regs __iomem *regs = mm_gc->regs;
- unsigned long flags;
- u32 pin_mask = 1 << (QE_PIO_PINS - 1 - gpio);
-
- spin_lock_irqsave(&qe_gc->lock, flags);
-
- if (val)
- qe_gc->cpdata |= pin_mask;
- else
- qe_gc->cpdata &= ~pin_mask;
-
- out_be32(&regs->cpdata, qe_gc->cpdata);
-
- spin_unlock_irqrestore(&qe_gc->lock, flags);
-}
-
-static int qe_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
-{
- struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
- struct qe_gpio_chip *qe_gc = to_qe_gpio_chip(mm_gc);
- unsigned long flags;
-
- spin_lock_irqsave(&qe_gc->lock, flags);
-
- __par_io_config_pin(mm_gc->regs, gpio, QE_PIO_DIR_IN, 0, 0, 0);
-
- spin_unlock_irqrestore(&qe_gc->lock, flags);
-
- return 0;
-}
-
-static int qe_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
-{
- struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
- struct qe_gpio_chip *qe_gc = to_qe_gpio_chip(mm_gc);
- unsigned long flags;
-
- qe_gpio_set(gc, gpio, val);
-
- spin_lock_irqsave(&qe_gc->lock, flags);
-
- __par_io_config_pin(mm_gc->regs, gpio, QE_PIO_DIR_OUT, 0, 0, 0);
-
- spin_unlock_irqrestore(&qe_gc->lock, flags);
-
- return 0;
-}
-
-struct qe_pin {
- /*
- * The qe_gpio_chip name is unfortunate, we should change that to
- * something like qe_pio_controller. Someday.
- */
- struct qe_gpio_chip *controller;
- int num;
-};
-
-/**
- * qe_pin_request - Request a QE pin
- * @np: device node to get a pin from
- * @index: index of a pin in the device tree
- * Context: non-atomic
- *
- * This function return qe_pin so that you could use it with the rest of
- * the QE Pin Multiplexing API.
- */
-struct qe_pin *qe_pin_request(struct device_node *np, int index)
-{
- struct qe_pin *qe_pin;
- struct gpio_chip *gc;
- struct of_mm_gpio_chip *mm_gc;
- struct qe_gpio_chip *qe_gc;
- int err;
- unsigned long flags;
-
- qe_pin = kzalloc(sizeof(*qe_pin), GFP_KERNEL);
- if (!qe_pin) {
- pr_debug("%s: can't allocate memory\n", __func__);
- return ERR_PTR(-ENOMEM);
- }
-
- err = of_get_gpio(np, index);
- if (err < 0)
- goto err0;
- gc = gpio_to_chip(err);
- if (WARN_ON(!gc))
- goto err0;
-
- if (!of_device_is_compatible(gc->of_node, "fsl,mpc8323-qe-pario-bank")) {
- pr_debug("%s: tried to get a non-qe pin\n", __func__);
- err = -EINVAL;
- goto err0;
- }
-
- mm_gc = to_of_mm_gpio_chip(gc);
- qe_gc = to_qe_gpio_chip(mm_gc);
-
- spin_lock_irqsave(&qe_gc->lock, flags);
-
- err -= gc->base;
- if (test_and_set_bit(QE_PIN_REQUESTED, &qe_gc->pin_flags[err]) == 0) {
- qe_pin->controller = qe_gc;
- qe_pin->num = err;
- err = 0;
- } else {
- err = -EBUSY;
- }
-
- spin_unlock_irqrestore(&qe_gc->lock, flags);
-
- if (!err)
- return qe_pin;
-err0:
- kfree(qe_pin);
- pr_debug("%s failed with status %d\n", __func__, err);
- return ERR_PTR(err);
-}
-EXPORT_SYMBOL(qe_pin_request);
-
-/**
- * qe_pin_free - Free a pin
- * @qe_pin: pointer to the qe_pin structure
- * Context: any
- *
- * This function frees the qe_pin structure and makes a pin available
- * for further qe_pin_request() calls.
- */
-void qe_pin_free(struct qe_pin *qe_pin)
-{
- struct qe_gpio_chip *qe_gc = qe_pin->controller;
- unsigned long flags;
- const int pin = qe_pin->num;
-
- spin_lock_irqsave(&qe_gc->lock, flags);
- test_and_clear_bit(QE_PIN_REQUESTED, &qe_gc->pin_flags[pin]);
- spin_unlock_irqrestore(&qe_gc->lock, flags);
-
- kfree(qe_pin);
-}
-EXPORT_SYMBOL(qe_pin_free);
-
-/**
- * qe_pin_set_dedicated - Revert a pin to a dedicated peripheral function mode
- * @qe_pin: pointer to the qe_pin structure
- * Context: any
- *
- * This function resets a pin to a dedicated peripheral function that
- * has been set up by the firmware.
- */
-void qe_pin_set_dedicated(struct qe_pin *qe_pin)
-{
- struct qe_gpio_chip *qe_gc = qe_pin->controller;
- struct qe_pio_regs __iomem *regs = qe_gc->mm_gc.regs;
- struct qe_pio_regs *sregs = &qe_gc->saved_regs;
- int pin = qe_pin->num;
- u32 mask1 = 1 << (QE_PIO_PINS - (pin + 1));
- u32 mask2 = 0x3 << (QE_PIO_PINS - (pin % (QE_PIO_PINS / 2) + 1) * 2);
- bool second_reg = pin > (QE_PIO_PINS / 2) - 1;
- unsigned long flags;
-
- spin_lock_irqsave(&qe_gc->lock, flags);
-
- if (second_reg) {
- clrsetbits_be32(&regs->cpdir2, mask2, sregs->cpdir2 & mask2);
- clrsetbits_be32(&regs->cppar2, mask2, sregs->cppar2 & mask2);
- } else {
- clrsetbits_be32(&regs->cpdir1, mask2, sregs->cpdir1 & mask2);
- clrsetbits_be32(&regs->cppar1, mask2, sregs->cppar1 & mask2);
- }
-
- if (sregs->cpdata & mask1)
- qe_gc->cpdata |= mask1;
- else
- qe_gc->cpdata &= ~mask1;
-
- out_be32(&regs->cpdata, qe_gc->cpdata);
- clrsetbits_be32(&regs->cpodr, mask1, sregs->cpodr & mask1);
-
- spin_unlock_irqrestore(&qe_gc->lock, flags);
-}
-EXPORT_SYMBOL(qe_pin_set_dedicated);
-
-/**
- * qe_pin_set_gpio - Set a pin to the GPIO mode
- * @qe_pin: pointer to the qe_pin structure
- * Context: any
- *
- * This function sets a pin to the GPIO mode.
- */
-void qe_pin_set_gpio(struct qe_pin *qe_pin)
-{
- struct qe_gpio_chip *qe_gc = qe_pin->controller;
- struct qe_pio_regs __iomem *regs = qe_gc->mm_gc.regs;
- unsigned long flags;
-
- spin_lock_irqsave(&qe_gc->lock, flags);
-
- /* Let's make it input by default, GPIO API is able to change that. */
- __par_io_config_pin(regs, qe_pin->num, QE_PIO_DIR_IN, 0, 0, 0);
-
- spin_unlock_irqrestore(&qe_gc->lock, flags);
-}
-EXPORT_SYMBOL(qe_pin_set_gpio);
-
-static int __init qe_add_gpiochips(void)
-{
- struct device_node *np;
-
- for_each_compatible_node(np, NULL, "fsl,mpc8323-qe-pario-bank") {
- int ret;
- struct qe_gpio_chip *qe_gc;
- struct of_mm_gpio_chip *mm_gc;
- struct gpio_chip *gc;
-
- qe_gc = kzalloc(sizeof(*qe_gc), GFP_KERNEL);
- if (!qe_gc) {
- ret = -ENOMEM;
- goto err;
- }
-
- spin_lock_init(&qe_gc->lock);
-
- mm_gc = &qe_gc->mm_gc;
- gc = &mm_gc->gc;
-
- mm_gc->save_regs = qe_gpio_save_regs;
- gc->ngpio = QE_PIO_PINS;
- gc->direction_input = qe_gpio_dir_in;
- gc->direction_output = qe_gpio_dir_out;
- gc->get = qe_gpio_get;
- gc->set = qe_gpio_set;
-
- ret = of_mm_gpiochip_add(np, mm_gc);
- if (ret)
- goto err;
- continue;
-err:
- pr_err("%s: registration failed with status %d\n",
- np->full_name, ret);
- kfree(qe_gc);
- /* try others anyway */
- }
- return 0;
-}
-arch_initcall(qe_add_gpiochips);