1/*
  2 * arch/powerpc/sysdev/qe_lib/qe_io.c
  3 *
  4 * QE Parallel I/O ports configuration routines
  5 *
  6 * Copyright 2006 Freescale Semiconductor, Inc. All rights reserved.
  7 *
  8 * Author: Li Yang <LeoLi@freescale.com>
  9 * Based on code from Shlomi Gridish <gridish@freescale.com>
 10 *
 11 * This program is free software; you can redistribute  it and/or modify it
 12 * under  the terms of  the GNU General  Public License as published by the
 13 * Free Software Foundation;  either version 2 of the  License, or (at your
 14 * option) any later version.
 15 */
 16
 17#include <linux/stddef.h>
 18#include <linux/kernel.h>
 19#include <linux/errno.h>
 20#include <linux/module.h>
 21#include <linux/ioport.h>
 22
 23#include <asm/io.h>
 24#include <asm/qe.h>
 25#include <asm/prom.h>
 26#include <sysdev/fsl_soc.h>
 27
 28#undef DEBUG
 29
 30static struct qe_pio_regs __iomem *par_io;
 31static int num_par_io_ports = 0;
 32
 33int par_io_init(struct device_node *np)
 34{
 35	struct resource res;
 36	int ret;
 37	const u32 *num_ports;
 38
 39	/* Map Parallel I/O ports registers */
 40	ret = of_address_to_resource(np, 0, &res);
 41	if (ret)
 42		return ret;
 43	par_io = ioremap(res.start, resource_size(&res));
 44
 45	num_ports = of_get_property(np, "num-ports", NULL);
 46	if (num_ports)
 47		num_par_io_ports = *num_ports;
 48
 49	return 0;
 50}
 51
 52void __par_io_config_pin(struct qe_pio_regs __iomem *par_io, u8 pin, int dir,
 53			 int open_drain, int assignment, int has_irq)
 54{
 55	u32 pin_mask1bit;
 56	u32 pin_mask2bits;
 57	u32 new_mask2bits;
 58	u32 tmp_val;
 59
 60	/* calculate pin location for single and 2 bits information */
 61	pin_mask1bit = (u32) (1 << (QE_PIO_PINS - (pin + 1)));
 62
 63	/* Set open drain, if required */
 64	tmp_val = in_be32(&par_io->cpodr);
 65	if (open_drain)
 66		out_be32(&par_io->cpodr, pin_mask1bit | tmp_val);
 67	else
 68		out_be32(&par_io->cpodr, ~pin_mask1bit & tmp_val);
 69
 70	/* define direction */
 71	tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
 72		in_be32(&par_io->cpdir2) :
 73		in_be32(&par_io->cpdir1);
 74
 75	/* get all bits mask for 2 bit per port */
 76	pin_mask2bits = (u32) (0x3 << (QE_PIO_PINS -
 77				(pin % (QE_PIO_PINS / 2) + 1) * 2));
 78
 79	/* Get the final mask we need for the right definition */
 80	new_mask2bits = (u32) (dir << (QE_PIO_PINS -
 81				(pin % (QE_PIO_PINS / 2) + 1) * 2));
 82
 83	/* clear and set 2 bits mask */
 84	if (pin > (QE_PIO_PINS / 2) - 1) {
 85		out_be32(&par_io->cpdir2,
 86			 ~pin_mask2bits & tmp_val);
 87		tmp_val &= ~pin_mask2bits;
 88		out_be32(&par_io->cpdir2, new_mask2bits | tmp_val);
 89	} else {
 90		out_be32(&par_io->cpdir1,
 91			 ~pin_mask2bits & tmp_val);
 92		tmp_val &= ~pin_mask2bits;
 93		out_be32(&par_io->cpdir1, new_mask2bits | tmp_val);
 94	}
 95	/* define pin assignment */
 96	tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ?
 97		in_be32(&par_io->cppar2) :
 98		in_be32(&par_io->cppar1);
 99
100	new_mask2bits = (u32) (assignment << (QE_PIO_PINS -
101			(pin % (QE_PIO_PINS / 2) + 1) * 2));
102	/* clear and set 2 bits mask */
103	if (pin > (QE_PIO_PINS / 2) - 1) {
104		out_be32(&par_io->cppar2,
105			 ~pin_mask2bits & tmp_val);
106		tmp_val &= ~pin_mask2bits;
107		out_be32(&par_io->cppar2, new_mask2bits | tmp_val);
108	} else {
109		out_be32(&par_io->cppar1,
110			 ~pin_mask2bits & tmp_val);
111		tmp_val &= ~pin_mask2bits;
112		out_be32(&par_io->cppar1, new_mask2bits | tmp_val);
113	}
114}
115EXPORT_SYMBOL(__par_io_config_pin);
116
117int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain,
118		      int assignment, int has_irq)
119{
120	if (!par_io || port >= num_par_io_ports)
121		return -EINVAL;
122
123	__par_io_config_pin(&par_io[port], pin, dir, open_drain, assignment,
124			    has_irq);
125	return 0;
126}
127EXPORT_SYMBOL(par_io_config_pin);
128
129int par_io_data_set(u8 port, u8 pin, u8 val)
130{
131	u32 pin_mask, tmp_val;
132
133	if (port >= num_par_io_ports)
134		return -EINVAL;
135	if (pin >= QE_PIO_PINS)
136		return -EINVAL;
137	/* calculate pin location */
138	pin_mask = (u32) (1 << (QE_PIO_PINS - 1 - pin));
139
140	tmp_val = in_be32(&par_io[port].cpdata);
141
142	if (val == 0)		/* clear */
143		out_be32(&par_io[port].cpdata, ~pin_mask & tmp_val);
144	else			/* set */
145		out_be32(&par_io[port].cpdata, pin_mask | tmp_val);
146
147	return 0;
148}
149EXPORT_SYMBOL(par_io_data_set);
150
151int par_io_of_config(struct device_node *np)
152{
153	struct device_node *pio;
154	const phandle *ph;
155	int pio_map_len;
156	const unsigned int *pio_map;
157
158	if (par_io == NULL) {
159		printk(KERN_ERR "par_io not initialized\n");
160		return -1;
161	}
162
163	ph = of_get_property(np, "pio-handle", NULL);
164	if (ph == NULL) {
165		printk(KERN_ERR "pio-handle not available\n");
166		return -1;
167	}
168
169	pio = of_find_node_by_phandle(*ph);
170
171	pio_map = of_get_property(pio, "pio-map", &pio_map_len);
172	if (pio_map == NULL) {
173		printk(KERN_ERR "pio-map is not set!\n");
174		return -1;
175	}
176	pio_map_len /= sizeof(unsigned int);
177	if ((pio_map_len % 6) != 0) {
178		printk(KERN_ERR "pio-map format wrong!\n");
179		return -1;
180	}
181
182	while (pio_map_len > 0) {
183		par_io_config_pin((u8) pio_map[0], (u8) pio_map[1],
184				(int) pio_map[2], (int) pio_map[3],
185				(int) pio_map[4], (int) pio_map[5]);
186		pio_map += 6;
187		pio_map_len -= 6;
188	}
189	of_node_put(pio);
190	return 0;
191}
192EXPORT_SYMBOL(par_io_of_config);
193
194#ifdef DEBUG
195static void dump_par_io(void)
196{
197	unsigned int i;
198
199	printk(KERN_INFO "%s: par_io=%p\n", __func__, par_io);
200	for (i = 0; i < num_par_io_ports; i++) {
201		printk(KERN_INFO "	cpodr[%u]=%08x\n", i,
202			in_be32(&par_io[i].cpodr));
203		printk(KERN_INFO "	cpdata[%u]=%08x\n", i,
204			in_be32(&par_io[i].cpdata));
205		printk(KERN_INFO "	cpdir1[%u]=%08x\n", i,
206			in_be32(&par_io[i].cpdir1));
207		printk(KERN_INFO "	cpdir2[%u]=%08x\n", i,
208			in_be32(&par_io[i].cpdir2));
209		printk(KERN_INFO "	cppar1[%u]=%08x\n", i,
210			in_be32(&par_io[i].cppar1));
211		printk(KERN_INFO "	cppar2[%u]=%08x\n", i,
212			in_be32(&par_io[i].cppar2));
213	}
214
215}
216EXPORT_SYMBOL(dump_par_io);
217#endif /* DEBUG */