[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>

3 files changed, 147 insertions, 89 deletions

diff --git a/arch/powerpc/platforms/52xx/Makefile b/arch/powerpc/platforms/52xx/Makefile
index 1c9c122123d8..b8f27a864069 100644
--- a/arch/powerpc/platforms/52xx/Makefile
+++ b/arch/powerpc/platforms/52xx/Makefile
@@ -2,7 +2,7 @@
 # Makefile for 52xx based boards
 #
 ifeq ($(CONFIG_PPC_MERGE),y)
-obj-y                           += mpc52xx_pic.o
+obj-y                           += mpc52xx_pic.o mpc52xx_common.o
 endif
 
 obj-$(CONFIG_PPC_EFIKA) += efika-setup.o efika-pci.o
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);
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pic.c b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
index 504154fdf6a6..cd91a6c3aafa 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pic.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
@@ -54,12 +54,12 @@ static unsigned char mpc52xx_map_senses[4] = {
  *
 */
 
-static inline void io_be_setbit(u32 __iomem * addr, int bitno)
+static inline void io_be_setbit(u32 __iomem *addr, int bitno)
 {
         out_be32(addr, in_be32(addr) | (1 << bitno));
 }
 
-static inline void io_be_clrbit(u32 __iomem * addr, int bitno)
+static inline void io_be_clrbit(u32 __iomem *addr, int bitno)
 {
         out_be32(addr, in_be32(addr) & ~(1 << bitno));
 }
@@ -104,7 +104,7 @@ static void mpc52xx_extirq_ack(unsigned int virq)
 
         pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
 
-        io_be_setbit(&intr->ctrl, 27 - l2irq);
+        io_be_setbit(&intr->ctrl, 27-l2irq);
 }
 
 static struct irq_chip mpc52xx_extirq_irqchip = {
@@ -379,81 +379,21 @@ static struct irq_host_ops mpc52xx_irqhost_ops = {
 
 void __init mpc52xx_init_irq(void)
 {
-        struct device_node *picnode = NULL;
-        int picnode_regsize;
-        u32 picnode_regoffset;
-
-        struct device_node *sdmanode = NULL;
-        int sdmanode_regsize;
-        u32 sdmanode_regoffset;
-
-        u64 size64;
-        int flags;
-
         u32 intr_ctrl;
-
-        picnode = of_find_compatible_node(NULL, "interrupt-controller",
-                                                "mpc5200-pic");
-        if (picnode == NULL) {
-                printk(KERN_ERR "MPC52xx PIC: "
-                        "Unable to find the interrupt controller "
-                        "in the OpenFirmware device tree\n");
-                goto end;
-        }
-
-        sdmanode = of_find_compatible_node(NULL, "dma-controller",
-                                                 "mpc5200-bestcomm");
-        if (sdmanode == NULL) {
-                printk(KERN_ERR "MPC52xx PIC"
-                        "Unable to find the Bestcomm DMA controller device "
-                        "in the OpenFirmware device tree\n");
-                goto end;
-        }
-
-        /* Retrieve PIC ressources */
-        picnode_regoffset = (u32) of_get_address(picnode, 0, &size64, &flags);
-        if (picnode_regoffset == 0) {
-                printk(KERN_ERR "MPC52xx PIC"
-                        "Unable to get the interrupt controller address\n");
-                goto end;
-        }
-
-        picnode_regoffset =
-                of_translate_address(picnode, (u32 *) picnode_regoffset);
-        picnode_regsize = (int)size64;
-
-        /* Retrieve SDMA ressources */
-        sdmanode_regoffset = (u32) of_get_address(sdmanode, 0, &size64, &flags);
-        if (sdmanode_regoffset == 0) {
-                printk(KERN_ERR "MPC52xx PIC: "
-                        "Unable to get the Bestcomm DMA controller address\n");
-                goto end;
-        }
-
-        sdmanode_regoffset =
-            of_translate_address(sdmanode, (u32 *) sdmanode_regoffset);
-        sdmanode_regsize = (int)size64;
+        struct device_node *picnode;
 
         /* Remap the necessary zones */
-        intr = ioremap(picnode_regoffset, picnode_regsize);
-        if (intr == NULL) {
-                printk(KERN_ERR "MPC52xx PIC: "
-                        "Unable to ioremap interrupt controller registers!\n");
-                goto end;
-        }
+        picnode = of_find_compatible_node(NULL, NULL, "mpc52xx-pic");
 
-        sdma = ioremap(sdmanode_regoffset, sdmanode_regsize);
-        if (sdma == NULL) {
-                iounmap(intr);
-                printk(KERN_ERR "MPC52xx PIC: "
-                        "Unable to ioremap Bestcomm DMA registers!\n");
-                goto end;
-        }
+        intr = mpc52xx_find_and_map("mpc52xx-pic");
+        if (!intr)
+                panic(__FILE__  ": find_and_map failed on 'mpc52xx-pic'. "
+                                "Check node !");
 
-        printk(KERN_INFO "MPC52xx PIC: MPC52xx PIC Remapped at 0x%8.8x\n",
-                picnode_regoffset);
-        printk(KERN_INFO "MPC52xx PIC: MPC52xx SDMA Remapped at 0x%8.8x\n",
-                sdmanode_regoffset);
+        sdma = mpc52xx_find_and_map("mpc52xx-bestcomm");
+        if (!sdma)
+                panic(__FILE__  ": find_and_map failed on 'mpc52xx-bestcomm'. "
+                                "Check node !");
 
         /* Disable all interrupt sources. */
         out_be32(&sdma->IntPend, 0xffffffff);   /* 1 means clear pending */
@@ -480,21 +420,15 @@ void __init mpc52xx_init_irq(void)
          * hw irq information provided by the ofw to linux virq
          */
 
-        mpc52xx_irqhost =
-            irq_alloc_host(IRQ_HOST_MAP_LINEAR, MPC52xx_IRQ_HIGHTESTHWIRQ,
-                           &mpc52xx_irqhost_ops, -1);
+        mpc52xx_irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
+                                         MPC52xx_IRQ_HIGHTESTHWIRQ,
+                                         &mpc52xx_irqhost_ops, -1);
 
-        if (mpc52xx_irqhost) {
-                mpc52xx_irqhost->host_data = picnode;
-                printk(KERN_INFO "MPC52xx PIC is up and running!\n");
-        } else {
-                printk(KERN_ERR
-                        "MPC52xx PIC: Unable to allocate the IRQ host\n");
-        }
+        if (!mpc52xx_irqhost)
+                panic(__FILE__ ": Cannot allocate the IRQ host\n");
 
-end:
-        of_node_put(picnode);
-        of_node_put(sdmanode);
+        mpc52xx_irqhost->host_data = picnode;
+        printk(KERN_INFO "MPC52xx PIC is up and running!\n");
 }
 
 /*
@@ -526,9 +460,10 @@ unsigned int mpc52xx_get_irq(void)
                         irq = ffs(status) - 1;
                         irq |=  (MPC52xx_IRQ_L1_SDMA << MPC52xx_IRQ_L1_OFFSET) &
                                 MPC52xx_IRQ_L1_MASK;
-                } else
+                } else {
                         irq |=  (MPC52xx_IRQ_L1_PERP << MPC52xx_IRQ_L1_OFFSET) &
                                 MPC52xx_IRQ_L1_MASK;
+                }
         }
 
         pr_debug("%s: irq=%x. virq=%d\n", __func__, irq,
@@ -536,4 +471,3 @@ unsigned int mpc52xx_get_irq(void)
 
         return irq_linear_revmap(mpc52xx_irqhost, irq);
 }
-