summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/fsl_85xx_l2ctlr.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/sysdev/fsl_85xx_l2ctlr.c')
-rw-r--r--arch/powerpc/sysdev/fsl_85xx_l2ctlr.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/fsl_85xx_l2ctlr.c b/arch/powerpc/sysdev/fsl_85xx_l2ctlr.c
new file mode 100644
index 0000000..cc8d655
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_85xx_l2ctlr.c
@@ -0,0 +1,231 @@
+/*
+ * Copyright 2009-2010 Freescale Semiconductor, Inc.
+ *
+ * QorIQ (P1/P2) L2 controller init for Cache-SRAM instantiation
+ *
+ * Author: Vivek Mahajan <vivek.mahajan@freescale.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of_platform.h>
+#include <asm/io.h>
+
+#include "fsl_85xx_cache_ctlr.h"
+
+static char *sram_size;
+static char *sram_offset;
+struct mpc85xx_l2ctlr __iomem *l2ctlr;
+
+static long get_cache_sram_size(void)
+{
+ unsigned long val;
+
+ if (!sram_size || (strict_strtoul(sram_size, 0, &val) < 0))
+ return -EINVAL;
+
+ return val;
+}
+
+static long get_cache_sram_offset(void)
+{
+ unsigned long val;
+
+ if (!sram_offset || (strict_strtoul(sram_offset, 0, &val) < 0))
+ return -EINVAL;
+
+ return val;
+}
+
+static int __init get_size_from_cmdline(char *str)
+{
+ if (!str)
+ return 0;
+
+ sram_size = str;
+ return 1;
+}
+
+static int __init get_offset_from_cmdline(char *str)
+{
+ if (!str)
+ return 0;
+
+ sram_offset = str;
+ return 1;
+}
+
+__setup("cache-sram-size=", get_size_from_cmdline);
+__setup("cache-sram-offset=", get_offset_from_cmdline);
+
+static int __devinit mpc85xx_l2ctlr_of_probe(struct platform_device *dev,
+ const struct of_device_id *match)
+{
+ long rval;
+ unsigned int rem;
+ unsigned char ways;
+ const unsigned int *prop;
+ unsigned int l2cache_size;
+ struct sram_parameters sram_params;
+
+ if (!dev->dev.of_node) {
+ dev_err(&dev->dev, "Device's OF-node is NULL\n");
+ return -EINVAL;
+ }
+
+ prop = of_get_property(dev->dev.of_node, "cache-size", NULL);
+ if (!prop) {
+ dev_err(&dev->dev, "Missing L2 cache-size\n");
+ return -EINVAL;
+ }
+ l2cache_size = *prop;
+
+ sram_params.sram_size = get_cache_sram_size();
+ if (sram_params.sram_size <= 0) {
+ dev_err(&dev->dev,
+ "Entire L2 as cache, Aborting Cache-SRAM stuff\n");
+ return -EINVAL;
+ }
+
+ sram_params.sram_offset = get_cache_sram_offset();
+ if (sram_params.sram_offset <= 0) {
+ dev_err(&dev->dev,
+ "Entire L2 as cache, provide a valid sram offset\n");
+ return -EINVAL;
+ }
+
+
+ rem = l2cache_size % sram_params.sram_size;
+ ways = LOCK_WAYS_FULL * sram_params.sram_size / l2cache_size;
+ if (rem || (ways & (ways - 1))) {
+ dev_err(&dev->dev, "Illegal cache-sram-size in command line\n");
+ return -EINVAL;
+ }
+
+ l2ctlr = of_iomap(dev->dev.of_node, 0);
+ if (!l2ctlr) {
+ dev_err(&dev->dev, "Can't map L2 controller\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Write bits[0-17] to srbar0
+ */
+ out_be32(&l2ctlr->srbar0,
+ sram_params.sram_offset & L2SRAM_BAR_MSK_LO18);
+
+ /*
+ * Write bits[18-21] to srbare0
+ */
+#ifdef CONFIG_PHYS_64BIT
+ out_be32(&l2ctlr->srbarea0,
+ (sram_params.sram_offset >> 32) & L2SRAM_BARE_MSK_HI4);
+#endif
+
+ clrsetbits_be32(&l2ctlr->ctl, L2CR_L2E, L2CR_L2FI);
+
+ switch (ways) {
+ case LOCK_WAYS_EIGHTH:
+ setbits32(&l2ctlr->ctl,
+ L2CR_L2E | L2CR_L2FI | L2CR_SRAM_EIGHTH);
+ break;
+
+ case LOCK_WAYS_TWO_EIGHTH:
+ setbits32(&l2ctlr->ctl,
+ L2CR_L2E | L2CR_L2FI | L2CR_SRAM_QUART);
+ break;
+
+ case LOCK_WAYS_HALF:
+ setbits32(&l2ctlr->ctl,
+ L2CR_L2E | L2CR_L2FI | L2CR_SRAM_HALF);
+ break;
+
+ case LOCK_WAYS_FULL:
+ default:
+ setbits32(&l2ctlr->ctl,
+ L2CR_L2E | L2CR_L2FI | L2CR_SRAM_FULL);
+ break;
+ }
+ eieio();
+
+ rval = instantiate_cache_sram(dev, sram_params);
+ if (rval < 0) {
+ dev_err(&dev->dev, "Can't instantiate Cache-SRAM\n");
+ iounmap(l2ctlr);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int __devexit mpc85xx_l2ctlr_of_remove(struct platform_device *dev)
+{
+ BUG_ON(!l2ctlr);
+
+ iounmap(l2ctlr);
+ remove_cache_sram(dev);
+ dev_info(&dev->dev, "MPC85xx L2 controller unloaded\n");
+
+ return 0;
+}
+
+static struct of_device_id mpc85xx_l2ctlr_of_match[] = {
+ {
+ .compatible = "fsl,p2020-l2-cache-controller",
+ },
+ {
+ .compatible = "fsl,p2010-l2-cache-controller",
+ },
+ {
+ .compatible = "fsl,p1020-l2-cache-controller",
+ },
+ {
+ .compatible = "fsl,p1011-l2-cache-controller",
+ },
+ {
+ .compatible = "fsl,p1013-l2-cache-controller",
+ },
+ {
+ .compatible = "fsl,p1022-l2-cache-controller",
+ },
+ {},
+};
+
+static struct of_platform_driver mpc85xx_l2ctlr_of_platform_driver = {
+ .driver = {
+ .name = "fsl-l2ctlr",
+ .owner = THIS_MODULE,
+ .of_match_table = mpc85xx_l2ctlr_of_match,
+ },
+ .probe = mpc85xx_l2ctlr_of_probe,
+ .remove = __devexit_p(mpc85xx_l2ctlr_of_remove),
+};
+
+static __init int mpc85xx_l2ctlr_of_init(void)
+{
+ return of_register_platform_driver(&mpc85xx_l2ctlr_of_platform_driver);
+}
+
+static void __exit mpc85xx_l2ctlr_of_exit(void)
+{
+ of_unregister_platform_driver(&mpc85xx_l2ctlr_of_platform_driver);
+}
+
+subsys_initcall(mpc85xx_l2ctlr_of_init);
+module_exit(mpc85xx_l2ctlr_of_exit);
+
+MODULE_DESCRIPTION("Freescale MPC85xx L2 controller init");
+MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud