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98658538 LY |
1 | /* |
2 | * arch/powerpc/sysdev/qe_lib/ucc.c | |
3 | * | |
4 | * QE UCC API Set - UCC specific routines implementations. | |
5 | * | |
6 | * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved. | |
7 | * | |
8 | * Authors: Shlomi Gridish <gridish@freescale.com> | |
9 | * Li Yang <leoli@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 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/stddef.h> | |
65482ccf | 21 | #include <linux/module.h> |
98658538 LY |
22 | |
23 | #include <asm/irq.h> | |
24 | #include <asm/io.h> | |
25 | #include <asm/immap_qe.h> | |
26 | #include <asm/qe.h> | |
27 | #include <asm/ucc.h> | |
28 | ||
5e41486c AV |
29 | DEFINE_SPINLOCK(cmxgcr_lock); |
30 | EXPORT_SYMBOL(cmxgcr_lock); | |
98658538 | 31 | |
6b0b594b | 32 | int ucc_set_qe_mux_mii_mng(unsigned int ucc_num) |
98658538 LY |
33 | { |
34 | unsigned long flags; | |
35 | ||
6b0b594b TT |
36 | if (ucc_num > UCC_MAX_NUM - 1) |
37 | return -EINVAL; | |
38 | ||
5e41486c | 39 | spin_lock_irqsave(&cmxgcr_lock, flags); |
6b0b594b TT |
40 | clrsetbits_be32(&qe_immr->qmx.cmxgcr, QE_CMXGCR_MII_ENET_MNG, |
41 | ucc_num << QE_CMXGCR_MII_ENET_MNG_SHIFT); | |
5e41486c | 42 | spin_unlock_irqrestore(&cmxgcr_lock, flags); |
98658538 LY |
43 | |
44 | return 0; | |
45 | } | |
65482ccf | 46 | EXPORT_SYMBOL(ucc_set_qe_mux_mii_mng); |
98658538 | 47 | |
6b0b594b TT |
48 | /* Configure the UCC to either Slow or Fast. |
49 | * | |
50 | * A given UCC can be figured to support either "slow" devices (e.g. UART) | |
51 | * or "fast" devices (e.g. Ethernet). | |
52 | * | |
53 | * 'ucc_num' is the UCC number, from 0 - 7. | |
54 | * | |
55 | * This function also sets the UCC_GUEMR_SET_RESERVED3 bit because that bit | |
56 | * must always be set to 1. | |
57 | */ | |
58 | int ucc_set_type(unsigned int ucc_num, enum ucc_speed_type speed) | |
98658538 | 59 | { |
6b0b594b | 60 | u8 __iomem *guemr; |
98658538 | 61 | |
6b0b594b TT |
62 | /* The GUEMR register is at the same location for both slow and fast |
63 | devices, so we just use uccX.slow.guemr. */ | |
98658538 | 64 | switch (ucc_num) { |
6b0b594b | 65 | case 0: guemr = &qe_immr->ucc1.slow.guemr; |
98658538 | 66 | break; |
6b0b594b | 67 | case 1: guemr = &qe_immr->ucc2.slow.guemr; |
98658538 | 68 | break; |
6b0b594b | 69 | case 2: guemr = &qe_immr->ucc3.slow.guemr; |
98658538 | 70 | break; |
6b0b594b | 71 | case 3: guemr = &qe_immr->ucc4.slow.guemr; |
98658538 | 72 | break; |
6b0b594b | 73 | case 4: guemr = &qe_immr->ucc5.slow.guemr; |
98658538 | 74 | break; |
6b0b594b | 75 | case 5: guemr = &qe_immr->ucc6.slow.guemr; |
98658538 | 76 | break; |
6b0b594b | 77 | case 6: guemr = &qe_immr->ucc7.slow.guemr; |
98658538 | 78 | break; |
6b0b594b | 79 | case 7: guemr = &qe_immr->ucc8.slow.guemr; |
98658538 LY |
80 | break; |
81 | default: | |
6b0b594b | 82 | return -EINVAL; |
98658538 | 83 | } |
6b0b594b TT |
84 | |
85 | clrsetbits_8(guemr, UCC_GUEMR_MODE_MASK, | |
86 | UCC_GUEMR_SET_RESERVED3 | speed); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static void get_cmxucr_reg(unsigned int ucc_num, __be32 **cmxucr, | |
92 | unsigned int *reg_num, unsigned int *shift) | |
93 | { | |
94 | unsigned int cmx = ((ucc_num & 1) << 1) + (ucc_num > 3); | |
95 | ||
96 | *reg_num = cmx + 1; | |
97 | *cmxucr = &qe_immr->qmx.cmxucr[cmx]; | |
98 | *shift = 16 - 8 * (ucc_num & 2); | |
98658538 LY |
99 | } |
100 | ||
6b0b594b | 101 | int ucc_mux_set_grant_tsa_bkpt(unsigned int ucc_num, int set, u32 mask) |
98658538 | 102 | { |
6b0b594b TT |
103 | __be32 *cmxucr; |
104 | unsigned int reg_num; | |
105 | unsigned int shift; | |
98658538 LY |
106 | |
107 | /* check if the UCC number is in range. */ | |
6b0b594b | 108 | if (ucc_num > UCC_MAX_NUM - 1) |
98658538 LY |
109 | return -EINVAL; |
110 | ||
6b0b594b | 111 | get_cmxucr_reg(ucc_num, &cmxucr, ®_num, &shift); |
98658538 LY |
112 | |
113 | if (set) | |
6b0b594b | 114 | setbits32(cmxucr, mask << shift); |
98658538 | 115 | else |
6b0b594b | 116 | clrbits32(cmxucr, mask << shift); |
98658538 LY |
117 | |
118 | return 0; | |
119 | } | |
120 | ||
6b0b594b TT |
121 | int ucc_set_qe_mux_rxtx(unsigned int ucc_num, enum qe_clock clock, |
122 | enum comm_dir mode) | |
98658538 | 123 | { |
6b0b594b TT |
124 | __be32 *cmxucr; |
125 | unsigned int reg_num; | |
126 | unsigned int shift; | |
127 | u32 clock_bits = 0; | |
98658538 LY |
128 | |
129 | /* check if the UCC number is in range. */ | |
6b0b594b | 130 | if (ucc_num > UCC_MAX_NUM - 1) |
98658538 LY |
131 | return -EINVAL; |
132 | ||
6b0b594b TT |
133 | /* The communications direction must be RX or TX */ |
134 | if (!((mode == COMM_DIR_RX) || (mode == COMM_DIR_TX))) | |
98658538 | 135 | return -EINVAL; |
98658538 | 136 | |
6b0b594b | 137 | get_cmxucr_reg(ucc_num, &cmxucr, ®_num, &shift); |
98658538 LY |
138 | |
139 | switch (reg_num) { | |
140 | case 1: | |
141 | switch (clock) { | |
6b0b594b TT |
142 | case QE_BRG1: clock_bits = 1; break; |
143 | case QE_BRG2: clock_bits = 2; break; | |
144 | case QE_BRG7: clock_bits = 3; break; | |
145 | case QE_BRG8: clock_bits = 4; break; | |
146 | case QE_CLK9: clock_bits = 5; break; | |
147 | case QE_CLK10: clock_bits = 6; break; | |
148 | case QE_CLK11: clock_bits = 7; break; | |
149 | case QE_CLK12: clock_bits = 8; break; | |
150 | case QE_CLK15: clock_bits = 9; break; | |
151 | case QE_CLK16: clock_bits = 10; break; | |
152 | default: break; | |
98658538 LY |
153 | } |
154 | break; | |
155 | case 2: | |
156 | switch (clock) { | |
6b0b594b TT |
157 | case QE_BRG5: clock_bits = 1; break; |
158 | case QE_BRG6: clock_bits = 2; break; | |
159 | case QE_BRG7: clock_bits = 3; break; | |
160 | case QE_BRG8: clock_bits = 4; break; | |
161 | case QE_CLK13: clock_bits = 5; break; | |
162 | case QE_CLK14: clock_bits = 6; break; | |
163 | case QE_CLK19: clock_bits = 7; break; | |
164 | case QE_CLK20: clock_bits = 8; break; | |
165 | case QE_CLK15: clock_bits = 9; break; | |
166 | case QE_CLK16: clock_bits = 10; break; | |
167 | default: break; | |
98658538 LY |
168 | } |
169 | break; | |
170 | case 3: | |
171 | switch (clock) { | |
6b0b594b TT |
172 | case QE_BRG9: clock_bits = 1; break; |
173 | case QE_BRG10: clock_bits = 2; break; | |
174 | case QE_BRG15: clock_bits = 3; break; | |
175 | case QE_BRG16: clock_bits = 4; break; | |
176 | case QE_CLK3: clock_bits = 5; break; | |
177 | case QE_CLK4: clock_bits = 6; break; | |
178 | case QE_CLK17: clock_bits = 7; break; | |
179 | case QE_CLK18: clock_bits = 8; break; | |
180 | case QE_CLK7: clock_bits = 9; break; | |
181 | case QE_CLK8: clock_bits = 10; break; | |
182 | case QE_CLK16: clock_bits = 11; break; | |
183 | default: break; | |
98658538 LY |
184 | } |
185 | break; | |
186 | case 4: | |
187 | switch (clock) { | |
6b0b594b TT |
188 | case QE_BRG13: clock_bits = 1; break; |
189 | case QE_BRG14: clock_bits = 2; break; | |
190 | case QE_BRG15: clock_bits = 3; break; | |
191 | case QE_BRG16: clock_bits = 4; break; | |
192 | case QE_CLK5: clock_bits = 5; break; | |
193 | case QE_CLK6: clock_bits = 6; break; | |
194 | case QE_CLK21: clock_bits = 7; break; | |
195 | case QE_CLK22: clock_bits = 8; break; | |
196 | case QE_CLK7: clock_bits = 9; break; | |
197 | case QE_CLK8: clock_bits = 10; break; | |
198 | case QE_CLK16: clock_bits = 11; break; | |
199 | default: break; | |
98658538 LY |
200 | } |
201 | break; | |
6b0b594b | 202 | default: break; |
98658538 LY |
203 | } |
204 | ||
6b0b594b TT |
205 | /* Check for invalid combination of clock and UCC number */ |
206 | if (!clock_bits) | |
98658538 | 207 | return -ENOENT; |
98658538 | 208 | |
6b0b594b TT |
209 | if (mode == COMM_DIR_RX) |
210 | shift += 4; | |
98658538 | 211 | |
6b0b594b TT |
212 | clrsetbits_be32(cmxucr, QE_CMXUCR_TX_CLK_SRC_MASK << shift, |
213 | clock_bits << shift); | |
98658538 LY |
214 | |
215 | return 0; | |
216 | } |