2 * Copyright 2009-2010 Freescale Semiconductor, Inc.
4 * QorIQ (P1/P2) L2 controller init for Cache-SRAM instantiation
6 * Author: Vivek Mahajan <vivek.mahajan@freescale.com>
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.
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.
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.
23 #include <linux/kernel.h>
24 #include <linux/of_platform.h>
27 #include "fsl_85xx_cache_ctlr.h"
29 static char *sram_size;
30 static char *sram_offset;
31 struct mpc85xx_l2ctlr __iomem *l2ctlr;
33 static long get_cache_sram_size(void)
37 if (!sram_size || (strict_strtoul(sram_size, 0, &val) < 0))
43 static long get_cache_sram_offset(void)
47 if (!sram_offset || (strict_strtoul(sram_offset, 0, &val) < 0))
53 static int __init get_size_from_cmdline(char *str)
62 static int __init get_offset_from_cmdline(char *str)
71 __setup("cache-sram-size=", get_size_from_cmdline);
72 __setup("cache-sram-offset=", get_offset_from_cmdline);
74 static int __devinit mpc85xx_l2ctlr_of_probe(struct platform_device *dev,
75 const struct of_device_id *match)
80 const unsigned int *prop;
81 unsigned int l2cache_size;
82 struct sram_parameters sram_params;
84 if (!dev->dev.of_node) {
85 dev_err(&dev->dev, "Device's OF-node is NULL\n");
89 prop = of_get_property(dev->dev.of_node, "cache-size", NULL);
91 dev_err(&dev->dev, "Missing L2 cache-size\n");
96 sram_params.sram_size = get_cache_sram_size();
97 if (sram_params.sram_size <= 0) {
99 "Entire L2 as cache, Aborting Cache-SRAM stuff\n");
103 sram_params.sram_offset = get_cache_sram_offset();
104 if (sram_params.sram_offset <= 0) {
106 "Entire L2 as cache, provide a valid sram offset\n");
111 rem = l2cache_size % sram_params.sram_size;
112 ways = LOCK_WAYS_FULL * sram_params.sram_size / l2cache_size;
113 if (rem || (ways & (ways - 1))) {
114 dev_err(&dev->dev, "Illegal cache-sram-size in command line\n");
118 l2ctlr = of_iomap(dev->dev.of_node, 0);
120 dev_err(&dev->dev, "Can't map L2 controller\n");
125 * Write bits[0-17] to srbar0
127 out_be32(&l2ctlr->srbar0,
128 sram_params.sram_offset & L2SRAM_BAR_MSK_LO18);
131 * Write bits[18-21] to srbare0
133 #ifdef CONFIG_PHYS_64BIT
134 out_be32(&l2ctlr->srbarea0,
135 (sram_params.sram_offset >> 32) & L2SRAM_BARE_MSK_HI4);
138 clrsetbits_be32(&l2ctlr->ctl, L2CR_L2E, L2CR_L2FI);
141 case LOCK_WAYS_EIGHTH:
142 setbits32(&l2ctlr->ctl,
143 L2CR_L2E | L2CR_L2FI | L2CR_SRAM_EIGHTH);
146 case LOCK_WAYS_TWO_EIGHTH:
147 setbits32(&l2ctlr->ctl,
148 L2CR_L2E | L2CR_L2FI | L2CR_SRAM_QUART);
152 setbits32(&l2ctlr->ctl,
153 L2CR_L2E | L2CR_L2FI | L2CR_SRAM_HALF);
158 setbits32(&l2ctlr->ctl,
159 L2CR_L2E | L2CR_L2FI | L2CR_SRAM_FULL);
164 rval = instantiate_cache_sram(dev, sram_params);
166 dev_err(&dev->dev, "Can't instantiate Cache-SRAM\n");
174 static int __devexit mpc85xx_l2ctlr_of_remove(struct platform_device *dev)
179 remove_cache_sram(dev);
180 dev_info(&dev->dev, "MPC85xx L2 controller unloaded\n");
185 static struct of_device_id mpc85xx_l2ctlr_of_match[] = {
187 .compatible = "fsl,p2020-l2-cache-controller",
190 .compatible = "fsl,p2010-l2-cache-controller",
193 .compatible = "fsl,p1020-l2-cache-controller",
196 .compatible = "fsl,p1011-l2-cache-controller",
199 .compatible = "fsl,p1013-l2-cache-controller",
202 .compatible = "fsl,p1022-l2-cache-controller",
207 static struct of_platform_driver mpc85xx_l2ctlr_of_platform_driver = {
209 .name = "fsl-l2ctlr",
210 .owner = THIS_MODULE,
211 .of_match_table = mpc85xx_l2ctlr_of_match,
213 .probe = mpc85xx_l2ctlr_of_probe,
214 .remove = __devexit_p(mpc85xx_l2ctlr_of_remove),
217 static __init int mpc85xx_l2ctlr_of_init(void)
219 return of_register_platform_driver(&mpc85xx_l2ctlr_of_platform_driver);
222 static void __exit mpc85xx_l2ctlr_of_exit(void)
224 of_unregister_platform_driver(&mpc85xx_l2ctlr_of_platform_driver);
227 subsys_initcall(mpc85xx_l2ctlr_of_init);
228 module_exit(mpc85xx_l2ctlr_of_exit);
230 MODULE_DESCRIPTION("Freescale MPC85xx L2 controller init");
231 MODULE_LICENSE("GPL v2");