Commit | Line | Data |
---|---|---|
15d014d1 LB |
1 | /* |
2 | * Generic library functions for the MSF (Media and Switch Fabric) unit | |
3 | * found on the Intel IXP2400 network processor. | |
4 | * | |
5 | * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org> | |
6 | * Dedicated to Marija Kulikova. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU Lesser General Public License as | |
10 | * published by the Free Software Foundation; either version 2.1 of the | |
11 | * License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <asm/hardware.h> | |
18 | #include <asm/arch/ixp2000-regs.h> | |
19 | #include <asm/delay.h> | |
20 | #include <asm/io.h> | |
21 | #include "ixp2400-msf.h" | |
22 | ||
23 | /* | |
24 | * This is the Intel recommended PLL init procedure as described on | |
25 | * page 340 of the IXP2400/IXP2800 Programmer's Reference Manual. | |
26 | */ | |
27 | static void ixp2400_pll_init(struct ixp2400_msf_parameters *mp) | |
28 | { | |
29 | int rx_dual_clock; | |
30 | int tx_dual_clock; | |
31 | u32 value; | |
32 | ||
33 | /* | |
34 | * If the RX mode is not 1x32, we have to enable both RX PLLs | |
35 | * (#0 and #1.) The same thing for the TX direction. | |
36 | */ | |
37 | rx_dual_clock = !!(mp->rx_mode & IXP2400_RX_MODE_WIDTH_MASK); | |
38 | tx_dual_clock = !!(mp->tx_mode & IXP2400_TX_MODE_WIDTH_MASK); | |
39 | ||
40 | /* | |
41 | * Read initial value. | |
42 | */ | |
43 | value = ixp2000_reg_read(IXP2000_MSF_CLK_CNTRL); | |
44 | ||
45 | /* | |
46 | * Put PLLs in powerdown and bypass mode. | |
47 | */ | |
48 | value |= 0x0000f0f0; | |
49 | ixp2000_reg_write(IXP2000_MSF_CLK_CNTRL, value); | |
50 | ||
51 | /* | |
52 | * Set single or dual clock mode bits. | |
53 | */ | |
54 | value &= ~0x03000000; | |
55 | value |= (rx_dual_clock << 24) | (tx_dual_clock << 25); | |
56 | ||
57 | /* | |
58 | * Set multipliers. | |
59 | */ | |
60 | value &= ~0x00ff0000; | |
61 | value |= mp->rxclk01_multiplier << 16; | |
62 | value |= mp->rxclk23_multiplier << 18; | |
63 | value |= mp->txclk01_multiplier << 20; | |
64 | value |= mp->txclk23_multiplier << 22; | |
65 | ||
66 | /* | |
67 | * And write value. | |
68 | */ | |
69 | ixp2000_reg_write(IXP2000_MSF_CLK_CNTRL, value); | |
70 | ||
71 | /* | |
72 | * Disable PLL bypass mode. | |
73 | */ | |
74 | value &= ~(0x00005000 | rx_dual_clock << 13 | tx_dual_clock << 15); | |
75 | ixp2000_reg_write(IXP2000_MSF_CLK_CNTRL, value); | |
76 | ||
77 | /* | |
78 | * Turn on PLLs. | |
79 | */ | |
80 | value &= ~(0x00000050 | rx_dual_clock << 5 | tx_dual_clock << 7); | |
81 | ixp2000_reg_write(IXP2000_MSF_CLK_CNTRL, value); | |
82 | ||
83 | /* | |
84 | * Wait for PLLs to lock. There are lock status bits, but IXP2400 | |
85 | * erratum #65 says that these lock bits should not be relied upon | |
86 | * as they might not accurately reflect the true state of the PLLs. | |
87 | */ | |
88 | udelay(100); | |
89 | } | |
90 | ||
91 | /* | |
92 | * Needed according to p480 of Programmer's Reference Manual. | |
93 | */ | |
94 | static void ixp2400_msf_free_rbuf_entries(struct ixp2400_msf_parameters *mp) | |
95 | { | |
96 | int size_bits; | |
97 | int i; | |
98 | ||
99 | /* | |
100 | * Work around IXP2400 erratum #69 (silent RBUF-to-DRAM transfer | |
101 | * corruption) in the Intel-recommended way: do not add the RBUF | |
102 | * elements susceptible to corruption to the freelist. | |
103 | */ | |
104 | size_bits = mp->rx_mode & IXP2400_RX_MODE_RBUF_SIZE_MASK; | |
105 | if (size_bits == IXP2400_RX_MODE_RBUF_SIZE_64) { | |
106 | for (i = 1; i < 128; i++) { | |
107 | if (i == 9 || i == 18 || i == 27) | |
108 | continue; | |
109 | ixp2000_reg_write(IXP2000_MSF_RBUF_ELEMENT_DONE, i); | |
110 | } | |
111 | } else if (size_bits == IXP2400_RX_MODE_RBUF_SIZE_128) { | |
112 | for (i = 1; i < 64; i++) { | |
113 | if (i == 4 || i == 9 || i == 13) | |
114 | continue; | |
115 | ixp2000_reg_write(IXP2000_MSF_RBUF_ELEMENT_DONE, i); | |
116 | } | |
117 | } else if (size_bits == IXP2400_RX_MODE_RBUF_SIZE_256) { | |
118 | for (i = 1; i < 32; i++) { | |
119 | if (i == 2 || i == 4 || i == 6) | |
120 | continue; | |
121 | ixp2000_reg_write(IXP2000_MSF_RBUF_ELEMENT_DONE, i); | |
122 | } | |
123 | } | |
124 | } | |
125 | ||
126 | static u32 ixp2400_msf_valid_channels(u32 reg) | |
127 | { | |
128 | u32 channels; | |
129 | ||
130 | channels = 0; | |
131 | switch (reg & IXP2400_RX_MODE_WIDTH_MASK) { | |
132 | case IXP2400_RX_MODE_1x32: | |
133 | channels = 0x1; | |
134 | if (reg & IXP2400_RX_MODE_MPHY && | |
135 | !(reg & IXP2400_RX_MODE_MPHY_32)) | |
136 | channels = 0xf; | |
137 | break; | |
138 | ||
139 | case IXP2400_RX_MODE_2x16: | |
140 | channels = 0x5; | |
141 | break; | |
142 | ||
143 | case IXP2400_RX_MODE_4x8: | |
144 | channels = 0xf; | |
145 | break; | |
146 | ||
147 | case IXP2400_RX_MODE_1x16_2x8: | |
148 | channels = 0xd; | |
149 | break; | |
150 | } | |
151 | ||
152 | return channels; | |
153 | } | |
154 | ||
155 | static void ixp2400_msf_enable_rx(struct ixp2400_msf_parameters *mp) | |
156 | { | |
157 | u32 value; | |
158 | ||
159 | value = ixp2000_reg_read(IXP2000_MSF_RX_CONTROL) & 0x0fffffff; | |
160 | value |= ixp2400_msf_valid_channels(mp->rx_mode) << 28; | |
161 | ixp2000_reg_write(IXP2000_MSF_RX_CONTROL, value); | |
162 | } | |
163 | ||
164 | static void ixp2400_msf_enable_tx(struct ixp2400_msf_parameters *mp) | |
165 | { | |
166 | u32 value; | |
167 | ||
168 | value = ixp2000_reg_read(IXP2000_MSF_TX_CONTROL) & 0x0fffffff; | |
169 | value |= ixp2400_msf_valid_channels(mp->tx_mode) << 28; | |
170 | ixp2000_reg_write(IXP2000_MSF_TX_CONTROL, value); | |
171 | } | |
172 | ||
173 | ||
174 | void ixp2400_msf_init(struct ixp2400_msf_parameters *mp) | |
175 | { | |
176 | u32 value; | |
177 | int i; | |
178 | ||
179 | /* | |
180 | * Init the RX/TX PLLs based on the passed parameter block. | |
181 | */ | |
182 | ixp2400_pll_init(mp); | |
183 | ||
184 | /* | |
185 | * Reset MSF. Bit 7 in IXP_RESET_0 resets the MSF. | |
186 | */ | |
187 | value = ixp2000_reg_read(IXP2000_RESET0); | |
188 | ixp2000_reg_write(IXP2000_RESET0, value | 0x80); | |
189 | ixp2000_reg_write(IXP2000_RESET0, value & ~0x80); | |
190 | ||
191 | /* | |
192 | * Initialise the RX section. | |
193 | */ | |
194 | ixp2000_reg_write(IXP2000_MSF_RX_MPHY_POLL_LIMIT, mp->rx_poll_ports - 1); | |
195 | ixp2000_reg_write(IXP2000_MSF_RX_CONTROL, mp->rx_mode); | |
196 | for (i = 0; i < 4; i++) { | |
197 | ixp2000_reg_write(IXP2000_MSF_RX_UP_CONTROL_0 + i, | |
198 | mp->rx_channel_mode[i]); | |
199 | } | |
200 | ixp2400_msf_free_rbuf_entries(mp); | |
201 | ixp2400_msf_enable_rx(mp); | |
202 | ||
203 | /* | |
204 | * Initialise the TX section. | |
205 | */ | |
206 | ixp2000_reg_write(IXP2000_MSF_TX_MPHY_POLL_LIMIT, mp->tx_poll_ports - 1); | |
207 | ixp2000_reg_write(IXP2000_MSF_TX_CONTROL, mp->tx_mode); | |
208 | for (i = 0; i < 4; i++) { | |
209 | ixp2000_reg_write(IXP2000_MSF_TX_UP_CONTROL_0 + i, | |
210 | mp->tx_channel_mode[i]); | |
211 | } | |
212 | ixp2400_msf_enable_tx(mp); | |
213 | } |