[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>

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);