aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/52xx/mpc52xx_common.c
diff options
context:
space:
mode:
authorGrant Likely <grant.likely@secretlab.ca>2006-11-27 14:16:27 -0700
committerPaul Mackerras <paulus@samba.org>2006-12-04 20:41:42 +1100
commit6065170cf75c64267f6edec5fd359ce8444bd13d (patch)
treea55c64e512282f545b35876906e8ffb2a597078c /arch/powerpc/platforms/52xx/mpc52xx_common.c
parent[POWERPC] Separate IRQ config / register set from main header (diff)
downloadlinux-dev-6065170cf75c64267f6edec5fd359ce8444bd13d.tar.xz
linux-dev-6065170cf75c64267f6edec5fd359ce8444bd13d.zip
[POWERPC] Add common routines for 52xx support in arch/powerpc
Adds utility routines used by 52xx device drivers and board support code. Main functionality is to add device nodes to the of_platform_bus, retrieve the IPB bus frequency, and find+ioremap device registers. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to '')
-rw-r--r--arch/powerpc/platforms/52xx/mpc52xx_common.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c
new file mode 100644
index 000000000000..05b214441275
--- /dev/null
+++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c
@@ -0,0 +1,124 @@
+/*
+ *
+ * Utility functions for the Freescale MPC52xx.
+ *
+ * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/kernel.h>
+
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/of_platform.h>
+#include <asm/mpc52xx.h>
+
+
+void __iomem *
+mpc52xx_find_and_map(const char *compatible)
+{
+ struct device_node *ofn;
+ const u32 *regaddr_p;
+ u64 regaddr64, size64;
+
+ ofn = of_find_compatible_node(NULL, NULL, compatible);
+ if (!ofn)
+ return NULL;
+
+ regaddr_p = of_get_address(ofn, 0, &size64, NULL);
+ if (!regaddr_p) {
+ of_node_put(ofn);
+ return NULL;
+ }
+
+ regaddr64 = of_translate_address(ofn, regaddr_p);
+
+ of_node_put(ofn);
+
+ return ioremap((u32)regaddr64, (u32)size64);
+}
+
+
+/**
+ * mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device
+ * @node: device node
+ *
+ * Returns IPB bus frequency, or 0 if the bus frequency cannot be found.
+ */
+unsigned int
+mpc52xx_find_ipb_freq(struct device_node *node)
+{
+ struct device_node *np;
+ const unsigned int *p_ipb_freq = NULL;
+
+ of_node_get(node);
+ while (node) {
+ p_ipb_freq = get_property(node, "bus-frequency", NULL);
+ if (p_ipb_freq)
+ break;
+
+ np = of_get_parent(node);
+ of_node_put(node);
+ node = np;
+ }
+ if (node)
+ of_node_put(node);
+
+ return p_ipb_freq ? *p_ipb_freq : 0;
+}
+
+
+void __init
+mpc52xx_setup_cpu(void)
+{
+ struct mpc52xx_cdm __iomem *cdm;
+ struct mpc52xx_xlb __iomem *xlb;
+
+ /* Map zones */
+ cdm = mpc52xx_find_and_map("mpc52xx-cdm");
+ xlb = mpc52xx_find_and_map("mpc52xx-xlb");
+
+ if (!cdm || !xlb) {
+ printk(KERN_ERR __FILE__ ": "
+ "Error while mapping CDM/XLB during mpc52xx_setup_cpu. "
+ "Expect some abnormal behavior\n");
+ goto unmap_regs;
+ }
+
+ /* Use internal 48 Mhz */
+ out_8(&cdm->ext_48mhz_en, 0x00);
+ out_8(&cdm->fd_enable, 0x01);
+ if (in_be32(&cdm->rstcfg) & 0x40) /* Assumes 33Mhz clock */
+ out_be16(&cdm->fd_counters, 0x0001);
+ else
+ out_be16(&cdm->fd_counters, 0x5555);
+
+ /* Configure the XLB Arbiter priorities */
+ out_be32(&xlb->master_pri_enable, 0xff);
+ out_be32(&xlb->master_priority, 0x11111111);
+
+ /* Disable XLB pipelining */
+ /* (cfr errate 292. We could do this only just before ATA PIO
+ transaction and re-enable it afterwards ...) */
+ out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);
+
+ /* Unmap zones */
+unmap_regs:
+ if (cdm) iounmap(cdm);
+ if (xlb) iounmap(xlb);
+}
+
+static int __init
+mpc52xx_declare_of_platform_devices(void)
+{
+ /* Find every child of the SOC node and add it to of_platform */
+ return of_platform_bus_probe(NULL, NULL, NULL);
+}
+
+device_initcall(mpc52xx_declare_of_platform_devices);