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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* arch/powerpc/sysdev/qe_lib/qe_io.c
*
* QE Parallel I/O ports configuration routines
*
* Copyright 2006 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Li Yang <LeoLi@freescale.com>
* Based on code from Shlomi Gridish <gridish@freescale.com>
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <soc/fsl/qe/qe.h>
#undef DEBUG
static struct qe_pio_regs __iomem *par_io;
static int num_par_io_ports = 0;
int par_io_init(struct device_node *np)
{
struct resource res;
int ret;
u32 num_ports;
/* Map Parallel I/O ports registers */
ret = of_address_to_resource(np, 0, &res);
if (ret)
return ret;
par_io = ioremap(res.start, resource_size(&res));
if (!par_io)
return -ENOMEM;
if (!of_property_read_u32(np, "num-ports", &num_ports))
num_par_io_ports = num_ports;
return 0;
}
void __par_io_config_pin(struct qe_pio_regs __iomem *par_io, u8 pin, int dir,
int open_drain, int assignment, int has_irq)
{
u32 pin_mask1bit;
u32 pin_mask2bits;
u32 new_mask2bits;
u32 tmp_val;
/* calculate pin location for single and 2 bits information */
pin_mask1bit = (u32) (1 << (QE_PIO_PINS - (pin + 1)));
/* Set open drain, if required */
tmp_val = qe_ioread32be(&par_io->cpodr);
if (open_drain)
qe_iowrite32be(pin_mask1bit | tmp_val, &par_io->cpodr);
else
qe_iowrite32be(~pin_mask1bit & tmp_val, &par_io->cpodr);
/* define direction */
tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
qe_ioread32be(&par_io->cpdir2) :
qe_ioread32be(&par_io->cpdir1);
/* get all bits mask for 2 bit per port */
pin_mask2bits = (u32) (0x3 << (QE_PIO_PINS -
(pin % (QE_PIO_PINS / 2) + 1) * 2));
/* Get the final mask we need for the right definition */
new_mask2bits = (u32) (dir << (QE_PIO_PINS -
(pin % (QE_PIO_PINS / 2) + 1) * 2));
/* clear and set 2 bits mask */
if (pin > (QE_PIO_PINS / 2) - 1) {
qe_iowrite32be(~pin_mask2bits & tmp_val, &par_io->cpdir2);
tmp_val &= ~pin_mask2bits;
qe_iowrite32be(new_mask2bits | tmp_val, &par_io->cpdir2);
} else {
qe_iowrite32be(~pin_mask2bits & tmp_val, &par_io->cpdir1);
tmp_val &= ~pin_mask2bits;
qe_iowrite32be(new_mask2bits | tmp_val, &par_io->cpdir1);
}
/* define pin assignment */
tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
qe_ioread32be(&par_io->cppar2) :
qe_ioread32be(&par_io->cppar1);
new_mask2bits = (u32) (assignment << (QE_PIO_PINS -
(pin % (QE_PIO_PINS / 2) + 1) * 2));
/* clear and set 2 bits mask */
if (pin > (QE_PIO_PINS / 2) - 1) {
qe_iowrite32be(~pin_mask2bits & tmp_val, &par_io->cppar2);
tmp_val &= ~pin_mask2bits;
qe_iowrite32be(new_mask2bits | tmp_val, &par_io->cppar2);
} else {
qe_iowrite32be(~pin_mask2bits & tmp_val, &par_io->cppar1);
tmp_val &= ~pin_mask2bits;
qe_iowrite32be(new_mask2bits | tmp_val, &par_io->cppar1);
}
}
EXPORT_SYMBOL(__par_io_config_pin);
int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain,
int assignment, int has_irq)
{
if (!par_io || port >= num_par_io_ports)
return -EINVAL;
__par_io_config_pin(&par_io[port], pin, dir, open_drain, assignment,
has_irq);
return 0;
}
EXPORT_SYMBOL(par_io_config_pin);
int par_io_data_set(u8 port, u8 pin, u8 val)
{
u32 pin_mask, tmp_val;
if (port >= num_par_io_ports)
return -EINVAL;
if (pin >= QE_PIO_PINS)
return -EINVAL;
/* calculate pin location */
pin_mask = (u32) (1 << (QE_PIO_PINS - 1 - pin));
tmp_val = qe_ioread32be(&par_io[port].cpdata);
if (val == 0) /* clear */
qe_iowrite32be(~pin_mask & tmp_val, &par_io[port].cpdata);
else /* set */
qe_iowrite32be(pin_mask | tmp_val, &par_io[port].cpdata);
return 0;
}
EXPORT_SYMBOL(par_io_data_set);
int par_io_of_config(struct device_node *np)
{
struct device_node *pio;
int pio_map_len;
const __be32 *pio_map;
if (par_io == NULL) {
printk(KERN_ERR "par_io not initialized\n");
return -1;
}
pio = of_parse_phandle(np, "pio-handle", 0);
if (pio == NULL) {
printk(KERN_ERR "pio-handle not available\n");
return -1;
}
pio_map = of_get_property(pio, "pio-map", &pio_map_len);
if (pio_map == NULL) {
printk(KERN_ERR "pio-map is not set!\n");
return -1;
}
pio_map_len /= sizeof(unsigned int);
if ((pio_map_len % 6) != 0) {
printk(KERN_ERR "pio-map format wrong!\n");
return -1;
}
while (pio_map_len > 0) {
u8 port = be32_to_cpu(pio_map[0]);
u8 pin = be32_to_cpu(pio_map[1]);
int dir = be32_to_cpu(pio_map[2]);
int open_drain = be32_to_cpu(pio_map[3]);
int assignment = be32_to_cpu(pio_map[4]);
int has_irq = be32_to_cpu(pio_map[5]);
par_io_config_pin(port, pin, dir, open_drain,
assignment, has_irq);
pio_map += 6;
pio_map_len -= 6;
}
of_node_put(pio);
return 0;
}
EXPORT_SYMBOL(par_io_of_config);
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