1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * arch/powerpc/sysdev/qe_lib/qe_io.c
5 * QE Parallel I/O ports configuration routines
7 * Copyright 2006 Freescale Semiconductor, Inc. All rights reserved.
9 * Author: Li Yang <LeoLi@freescale.com>
10 * Based on code from Shlomi Gridish <gridish@freescale.com>
13 #include <linux/stddef.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/module.h>
17 #include <linux/ioport.h>
20 #include <soc/fsl/qe/qe.h>
24 static struct qe_pio_regs __iomem *par_io;
25 static int num_par_io_ports = 0;
27 int par_io_init(struct device_node *np)
33 /* Map Parallel I/O ports registers */
34 ret = of_address_to_resource(np, 0, &res);
37 par_io = ioremap(res.start, resource_size(&res));
41 if (!of_property_read_u32(np, "num-ports", &num_ports))
42 num_par_io_ports = num_ports;
47 void __par_io_config_pin(struct qe_pio_regs __iomem *par_io, u8 pin, int dir,
48 int open_drain, int assignment, int has_irq)
55 /* calculate pin location for single and 2 bits information */
56 pin_mask1bit = (u32) (1 << (QE_PIO_PINS - (pin + 1)));
58 /* Set open drain, if required */
59 tmp_val = qe_ioread32be(&par_io->cpodr);
61 qe_iowrite32be(pin_mask1bit | tmp_val, &par_io->cpodr);
63 qe_iowrite32be(~pin_mask1bit & tmp_val, &par_io->cpodr);
65 /* define direction */
66 tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
67 qe_ioread32be(&par_io->cpdir2) :
68 qe_ioread32be(&par_io->cpdir1);
70 /* get all bits mask for 2 bit per port */
71 pin_mask2bits = (u32) (0x3 << (QE_PIO_PINS -
72 (pin % (QE_PIO_PINS / 2) + 1) * 2));
74 /* Get the final mask we need for the right definition */
75 new_mask2bits = (u32) (dir << (QE_PIO_PINS -
76 (pin % (QE_PIO_PINS / 2) + 1) * 2));
78 /* clear and set 2 bits mask */
79 if (pin > (QE_PIO_PINS / 2) - 1) {
80 qe_iowrite32be(~pin_mask2bits & tmp_val, &par_io->cpdir2);
81 tmp_val &= ~pin_mask2bits;
82 qe_iowrite32be(new_mask2bits | tmp_val, &par_io->cpdir2);
84 qe_iowrite32be(~pin_mask2bits & tmp_val, &par_io->cpdir1);
85 tmp_val &= ~pin_mask2bits;
86 qe_iowrite32be(new_mask2bits | tmp_val, &par_io->cpdir1);
88 /* define pin assignment */
89 tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
90 qe_ioread32be(&par_io->cppar2) :
91 qe_ioread32be(&par_io->cppar1);
93 new_mask2bits = (u32) (assignment << (QE_PIO_PINS -
94 (pin % (QE_PIO_PINS / 2) + 1) * 2));
95 /* clear and set 2 bits mask */
96 if (pin > (QE_PIO_PINS / 2) - 1) {
97 qe_iowrite32be(~pin_mask2bits & tmp_val, &par_io->cppar2);
98 tmp_val &= ~pin_mask2bits;
99 qe_iowrite32be(new_mask2bits | tmp_val, &par_io->cppar2);
101 qe_iowrite32be(~pin_mask2bits & tmp_val, &par_io->cppar1);
102 tmp_val &= ~pin_mask2bits;
103 qe_iowrite32be(new_mask2bits | tmp_val, &par_io->cppar1);
106 EXPORT_SYMBOL(__par_io_config_pin);
108 int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain,
109 int assignment, int has_irq)
111 if (!par_io || port >= num_par_io_ports)
114 __par_io_config_pin(&par_io[port], pin, dir, open_drain, assignment,
118 EXPORT_SYMBOL(par_io_config_pin);
120 int par_io_data_set(u8 port, u8 pin, u8 val)
122 u32 pin_mask, tmp_val;
124 if (port >= num_par_io_ports)
126 if (pin >= QE_PIO_PINS)
128 /* calculate pin location */
129 pin_mask = (u32) (1 << (QE_PIO_PINS - 1 - pin));
131 tmp_val = qe_ioread32be(&par_io[port].cpdata);
133 if (val == 0) /* clear */
134 qe_iowrite32be(~pin_mask & tmp_val, &par_io[port].cpdata);
136 qe_iowrite32be(pin_mask | tmp_val, &par_io[port].cpdata);
140 EXPORT_SYMBOL(par_io_data_set);
142 int par_io_of_config(struct device_node *np)
144 struct device_node *pio;
146 const __be32 *pio_map;
148 if (par_io == NULL) {
149 printk(KERN_ERR "par_io not initialized\n");
153 pio = of_parse_phandle(np, "pio-handle", 0);
155 printk(KERN_ERR "pio-handle not available\n");
159 pio_map = of_get_property(pio, "pio-map", &pio_map_len);
160 if (pio_map == NULL) {
161 printk(KERN_ERR "pio-map is not set!\n");
164 pio_map_len /= sizeof(unsigned int);
165 if ((pio_map_len % 6) != 0) {
166 printk(KERN_ERR "pio-map format wrong!\n");
170 while (pio_map_len > 0) {
171 u8 port = be32_to_cpu(pio_map[0]);
172 u8 pin = be32_to_cpu(pio_map[1]);
173 int dir = be32_to_cpu(pio_map[2]);
174 int open_drain = be32_to_cpu(pio_map[3]);
175 int assignment = be32_to_cpu(pio_map[4]);
176 int has_irq = be32_to_cpu(pio_map[5]);
178 par_io_config_pin(port, pin, dir, open_drain,
179 assignment, has_irq);
186 EXPORT_SYMBOL(par_io_of_config);