tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright 2009-2010, 2012 Freescale Semiconductor, Inc.
3 *
4 * QorIQ (P1/P2) L2 controller init for Cache-SRAM instantiation
5 *
6 * Author: Vivek Mahajan <vivek.mahajan@freescale.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/of_platform.h>
26#include <asm/io.h>
27
28#include "fsl_85xx_cache_ctlr.h"
29
30static char *sram_size;
31static char *sram_offset;
32struct mpc85xx_l2ctlr __iomem *l2ctlr;
33
34static int get_cache_sram_params(struct sram_parameters *sram_params)
35{
36 unsigned long long addr;
37 unsigned int size;
38
39 if (!sram_size || (kstrtouint(sram_size, 0, &size) < 0))
40 return -EINVAL;
41
42 if (!sram_offset || (kstrtoull(sram_offset, 0, &addr) < 0))
43 return -EINVAL;
44
45 sram_params->sram_offset = addr;
46 sram_params->sram_size = size;
47
48 return 0;
49}
50
51static int __init get_size_from_cmdline(char *str)
52{
53 if (!str)
54 return 0;
55
56 sram_size = str;
57 return 1;
58}
59
60static int __init get_offset_from_cmdline(char *str)
61{
62 if (!str)
63 return 0;
64
65 sram_offset = str;
66 return 1;
67}
68
69__setup("cache-sram-size=", get_size_from_cmdline);
70__setup("cache-sram-offset=", get_offset_from_cmdline);
71
72static int mpc85xx_l2ctlr_of_probe(struct platform_device *dev)
73{
74 long rval;
75 unsigned int rem;
76 unsigned char ways;
77 const unsigned int *prop;
78 unsigned int l2cache_size;
79 struct sram_parameters sram_params;
80
81 if (!dev->dev.of_node) {
82 dev_err(&dev->dev, "Device's OF-node is NULL\n");
83 return -EINVAL;
84 }
85
86 prop = of_get_property(dev->dev.of_node, "cache-size", NULL);
87 if (!prop) {
88 dev_err(&dev->dev, "Missing L2 cache-size\n");
89 return -EINVAL;
90 }
91 l2cache_size = *prop;
92
93 if (get_cache_sram_params(&sram_params))
94 return 0; /* fall back to L2 cache only */
95
96 rem = l2cache_size % sram_params.sram_size;
97 ways = LOCK_WAYS_FULL * sram_params.sram_size / l2cache_size;
98 if (rem || (ways & (ways - 1))) {
99 dev_err(&dev->dev, "Illegal cache-sram-size in command line\n");
100 return -EINVAL;
101 }
102
103 l2ctlr = of_iomap(dev->dev.of_node, 0);
104 if (!l2ctlr) {
105 dev_err(&dev->dev, "Can't map L2 controller\n");
106 return -EINVAL;
107 }
108
109 /*
110 * Write bits[0-17] to srbar0
111 */
112 out_be32(&l2ctlr->srbar0,
113 lower_32_bits(sram_params.sram_offset) & L2SRAM_BAR_MSK_LO18);
114
115 /*
116 * Write bits[18-21] to srbare0
117 */
118#ifdef CONFIG_PHYS_64BIT
119 out_be32(&l2ctlr->srbarea0,
120 upper_32_bits(sram_params.sram_offset) & L2SRAM_BARE_MSK_HI4);
121#endif
122
123 clrsetbits_be32(&l2ctlr->ctl, L2CR_L2E, L2CR_L2FI);
124
125 switch (ways) {
126 case LOCK_WAYS_EIGHTH:
127 setbits32(&l2ctlr->ctl,
128 L2CR_L2E | L2CR_L2FI | L2CR_SRAM_EIGHTH);
129 break;
130
131 case LOCK_WAYS_TWO_EIGHTH:
132 setbits32(&l2ctlr->ctl,
133 L2CR_L2E | L2CR_L2FI | L2CR_SRAM_QUART);
134 break;
135
136 case LOCK_WAYS_HALF:
137 setbits32(&l2ctlr->ctl,
138 L2CR_L2E | L2CR_L2FI | L2CR_SRAM_HALF);
139 break;
140
141 case LOCK_WAYS_FULL:
142 default:
143 setbits32(&l2ctlr->ctl,
144 L2CR_L2E | L2CR_L2FI | L2CR_SRAM_FULL);
145 break;
146 }
147 eieio();
148
149 rval = instantiate_cache_sram(dev, sram_params);
150 if (rval < 0) {
151 dev_err(&dev->dev, "Can't instantiate Cache-SRAM\n");
152 iounmap(l2ctlr);
153 return -EINVAL;
154 }
155
156 return 0;
157}
158
159static int mpc85xx_l2ctlr_of_remove(struct platform_device *dev)
160{
161 BUG_ON(!l2ctlr);
162
163 iounmap(l2ctlr);
164 remove_cache_sram(dev);
165 dev_info(&dev->dev, "MPC85xx L2 controller unloaded\n");
166
167 return 0;
168}
169
170static const struct of_device_id mpc85xx_l2ctlr_of_match[] = {
171 {
172 .compatible = "fsl,p2020-l2-cache-controller",
173 },
174 {
175 .compatible = "fsl,p2010-l2-cache-controller",
176 },
177 {
178 .compatible = "fsl,p1020-l2-cache-controller",
179 },
180 {
181 .compatible = "fsl,p1011-l2-cache-controller",
182 },
183 {
184 .compatible = "fsl,p1013-l2-cache-controller",
185 },
186 {
187 .compatible = "fsl,p1022-l2-cache-controller",
188 },
189 {
190 .compatible = "fsl,mpc8548-l2-cache-controller",
191 },
192 { .compatible = "fsl,mpc8544-l2-cache-controller",},
193 { .compatible = "fsl,mpc8572-l2-cache-controller",},
194 { .compatible = "fsl,mpc8536-l2-cache-controller",},
195 { .compatible = "fsl,p1021-l2-cache-controller",},
196 { .compatible = "fsl,p1012-l2-cache-controller",},
197 { .compatible = "fsl,p1025-l2-cache-controller",},
198 { .compatible = "fsl,p1016-l2-cache-controller",},
199 { .compatible = "fsl,p1024-l2-cache-controller",},
200 { .compatible = "fsl,p1015-l2-cache-controller",},
201 { .compatible = "fsl,p1010-l2-cache-controller",},
202 { .compatible = "fsl,bsc9131-l2-cache-controller",},
203 {},
204};
205
206static struct platform_driver mpc85xx_l2ctlr_of_platform_driver = {
207 .driver = {
208 .name = "fsl-l2ctlr",
209 .of_match_table = mpc85xx_l2ctlr_of_match,
210 },
211 .probe = mpc85xx_l2ctlr_of_probe,
212 .remove = mpc85xx_l2ctlr_of_remove,
213};
214
215static __init int mpc85xx_l2ctlr_of_init(void)
216{
217 return platform_driver_register(&mpc85xx_l2ctlr_of_platform_driver);
218}
219
220static void __exit mpc85xx_l2ctlr_of_exit(void)
221{
222 platform_driver_unregister(&mpc85xx_l2ctlr_of_platform_driver);
223}
224
225subsys_initcall(mpc85xx_l2ctlr_of_init);
226module_exit(mpc85xx_l2ctlr_of_exit);
227
228MODULE_DESCRIPTION("Freescale MPC85xx L2 controller init");
229MODULE_LICENSE("GPL v2");