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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
98658538 LY |
2 | /* |
3 | * arch/powerpc/sysdev/qe_lib/qe_io.c | |
4 | * | |
5 | * QE Parallel I/O ports configuration routines | |
6 | * | |
8a56e1ee | 7 | * Copyright 2006 Freescale Semiconductor, Inc. All rights reserved. |
98658538 LY |
8 | * |
9 | * Author: Li Yang <LeoLi@freescale.com> | |
10 | * Based on code from Shlomi Gridish <gridish@freescale.com> | |
98658538 LY |
11 | */ |
12 | ||
98658538 LY |
13 | #include <linux/stddef.h> |
14 | #include <linux/kernel.h> | |
98658538 LY |
15 | #include <linux/errno.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/ioport.h> | |
18 | ||
19 | #include <asm/io.h> | |
7aa1aa6e | 20 | #include <soc/fsl/qe/qe.h> |
98658538 LY |
21 | #include <asm/prom.h> |
22 | #include <sysdev/fsl_soc.h> | |
23 | ||
24 | #undef DEBUG | |
25 | ||
9572653e | 26 | static struct qe_pio_regs __iomem *par_io; |
98658538 LY |
27 | static int num_par_io_ports = 0; |
28 | ||
29 | int par_io_init(struct device_node *np) | |
30 | { | |
31 | struct resource res; | |
32 | int ret; | |
33 | const u32 *num_ports; | |
34 | ||
35 | /* Map Parallel I/O ports registers */ | |
36 | ret = of_address_to_resource(np, 0, &res); | |
37 | if (ret) | |
38 | return ret; | |
28f65c11 | 39 | par_io = ioremap(res.start, resource_size(&res)); |
98658538 | 40 | |
e2eb6392 | 41 | num_ports = of_get_property(np, "num-ports", NULL); |
98658538 LY |
42 | if (num_ports) |
43 | num_par_io_ports = *num_ports; | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
9572653e AV |
48 | void __par_io_config_pin(struct qe_pio_regs __iomem *par_io, u8 pin, int dir, |
49 | int open_drain, int assignment, int has_irq) | |
98658538 | 50 | { |
9572653e AV |
51 | u32 pin_mask1bit; |
52 | u32 pin_mask2bits; | |
53 | u32 new_mask2bits; | |
54 | u32 tmp_val; | |
98658538 LY |
55 | |
56 | /* calculate pin location for single and 2 bits information */ | |
9572653e | 57 | pin_mask1bit = (u32) (1 << (QE_PIO_PINS - (pin + 1))); |
98658538 LY |
58 | |
59 | /* Set open drain, if required */ | |
9572653e | 60 | tmp_val = in_be32(&par_io->cpodr); |
98658538 | 61 | if (open_drain) |
9572653e | 62 | out_be32(&par_io->cpodr, pin_mask1bit | tmp_val); |
98658538 | 63 | else |
9572653e | 64 | out_be32(&par_io->cpodr, ~pin_mask1bit & tmp_val); |
98658538 LY |
65 | |
66 | /* define direction */ | |
9572653e AV |
67 | tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ? |
68 | in_be32(&par_io->cpdir2) : | |
69 | in_be32(&par_io->cpdir1); | |
98658538 LY |
70 | |
71 | /* get all bits mask for 2 bit per port */ | |
9572653e AV |
72 | pin_mask2bits = (u32) (0x3 << (QE_PIO_PINS - |
73 | (pin % (QE_PIO_PINS / 2) + 1) * 2)); | |
98658538 LY |
74 | |
75 | /* Get the final mask we need for the right definition */ | |
9572653e AV |
76 | new_mask2bits = (u32) (dir << (QE_PIO_PINS - |
77 | (pin % (QE_PIO_PINS / 2) + 1) * 2)); | |
98658538 LY |
78 | |
79 | /* clear and set 2 bits mask */ | |
9572653e AV |
80 | if (pin > (QE_PIO_PINS / 2) - 1) { |
81 | out_be32(&par_io->cpdir2, | |
98658538 LY |
82 | ~pin_mask2bits & tmp_val); |
83 | tmp_val &= ~pin_mask2bits; | |
9572653e | 84 | out_be32(&par_io->cpdir2, new_mask2bits | tmp_val); |
98658538 | 85 | } else { |
9572653e | 86 | out_be32(&par_io->cpdir1, |
98658538 LY |
87 | ~pin_mask2bits & tmp_val); |
88 | tmp_val &= ~pin_mask2bits; | |
9572653e | 89 | out_be32(&par_io->cpdir1, new_mask2bits | tmp_val); |
98658538 LY |
90 | } |
91 | /* define pin assignment */ | |
9572653e AV |
92 | tmp_val = (pin > (QE_PIO_PINS / 2) - 1) ? |
93 | in_be32(&par_io->cppar2) : | |
94 | in_be32(&par_io->cppar1); | |
98658538 | 95 | |
9572653e AV |
96 | new_mask2bits = (u32) (assignment << (QE_PIO_PINS - |
97 | (pin % (QE_PIO_PINS / 2) + 1) * 2)); | |
98658538 | 98 | /* clear and set 2 bits mask */ |
9572653e AV |
99 | if (pin > (QE_PIO_PINS / 2) - 1) { |
100 | out_be32(&par_io->cppar2, | |
98658538 LY |
101 | ~pin_mask2bits & tmp_val); |
102 | tmp_val &= ~pin_mask2bits; | |
9572653e | 103 | out_be32(&par_io->cppar2, new_mask2bits | tmp_val); |
98658538 | 104 | } else { |
9572653e | 105 | out_be32(&par_io->cppar1, |
98658538 LY |
106 | ~pin_mask2bits & tmp_val); |
107 | tmp_val &= ~pin_mask2bits; | |
9572653e | 108 | out_be32(&par_io->cppar1, new_mask2bits | tmp_val); |
98658538 | 109 | } |
9572653e AV |
110 | } |
111 | EXPORT_SYMBOL(__par_io_config_pin); | |
112 | ||
113 | int par_io_config_pin(u8 port, u8 pin, int dir, int open_drain, | |
114 | int assignment, int has_irq) | |
115 | { | |
116 | if (!par_io || port >= num_par_io_ports) | |
117 | return -EINVAL; | |
98658538 | 118 | |
9572653e AV |
119 | __par_io_config_pin(&par_io[port], pin, dir, open_drain, assignment, |
120 | has_irq); | |
98658538 LY |
121 | return 0; |
122 | } | |
123 | EXPORT_SYMBOL(par_io_config_pin); | |
124 | ||
125 | int par_io_data_set(u8 port, u8 pin, u8 val) | |
126 | { | |
127 | u32 pin_mask, tmp_val; | |
128 | ||
129 | if (port >= num_par_io_ports) | |
130 | return -EINVAL; | |
9572653e | 131 | if (pin >= QE_PIO_PINS) |
98658538 LY |
132 | return -EINVAL; |
133 | /* calculate pin location */ | |
9572653e | 134 | pin_mask = (u32) (1 << (QE_PIO_PINS - 1 - pin)); |
98658538 LY |
135 | |
136 | tmp_val = in_be32(&par_io[port].cpdata); | |
137 | ||
138 | if (val == 0) /* clear */ | |
139 | out_be32(&par_io[port].cpdata, ~pin_mask & tmp_val); | |
140 | else /* set */ | |
141 | out_be32(&par_io[port].cpdata, pin_mask | tmp_val); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | EXPORT_SYMBOL(par_io_data_set); | |
146 | ||
147 | int par_io_of_config(struct device_node *np) | |
148 | { | |
149 | struct device_node *pio; | |
150 | const phandle *ph; | |
151 | int pio_map_len; | |
152 | const unsigned int *pio_map; | |
153 | ||
154 | if (par_io == NULL) { | |
8354be9c | 155 | printk(KERN_ERR "par_io not initialized\n"); |
98658538 LY |
156 | return -1; |
157 | } | |
158 | ||
e2eb6392 | 159 | ph = of_get_property(np, "pio-handle", NULL); |
632395e1 | 160 | if (ph == NULL) { |
8354be9c | 161 | printk(KERN_ERR "pio-handle not available\n"); |
98658538 LY |
162 | return -1; |
163 | } | |
164 | ||
165 | pio = of_find_node_by_phandle(*ph); | |
166 | ||
e2eb6392 | 167 | pio_map = of_get_property(pio, "pio-map", &pio_map_len); |
98658538 | 168 | if (pio_map == NULL) { |
8354be9c | 169 | printk(KERN_ERR "pio-map is not set!\n"); |
98658538 LY |
170 | return -1; |
171 | } | |
172 | pio_map_len /= sizeof(unsigned int); | |
173 | if ((pio_map_len % 6) != 0) { | |
8354be9c | 174 | printk(KERN_ERR "pio-map format wrong!\n"); |
98658538 LY |
175 | return -1; |
176 | } | |
177 | ||
178 | while (pio_map_len > 0) { | |
179 | par_io_config_pin((u8) pio_map[0], (u8) pio_map[1], | |
180 | (int) pio_map[2], (int) pio_map[3], | |
181 | (int) pio_map[4], (int) pio_map[5]); | |
182 | pio_map += 6; | |
183 | pio_map_len -= 6; | |
184 | } | |
185 | of_node_put(pio); | |
186 | return 0; | |
187 | } | |
188 | EXPORT_SYMBOL(par_io_of_config); |