[POWERPC] Add common routines for 52xx support in arch/powerpc
authorGrant Likely <grant.likely@secretlab.ca>
Mon, 27 Nov 2006 21:16:27 +0000 (14:16 -0700)
committerPaul Mackerras <paulus@samba.org>
Mon, 4 Dec 2006 09:41:42 +0000 (20:41 +1100)
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>
arch/powerpc/platforms/52xx/Makefile
arch/powerpc/platforms/52xx/mpc52xx_common.c [new file with mode: 0644]
arch/powerpc/platforms/52xx/mpc52xx_pic.c
include/asm-powerpc/mpc52xx.h

index 1c9c122123d892ecbee3ef29c21eeebcab5072c3..b8f27a864069b48c9b7487000a90f9bb86dab9e9 100644 (file)
@@ -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 (file)
index 0000000..05b2144
--- /dev/null
@@ -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);
index 504154fdf6a6407d643328a3b80b4be3c6056a62..cd91a6c3aafa5b90edaaf0cf5c07f1e96871713b 100644 (file)
@@ -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);
 }
-
index fff752c4bd17abc254dfed1869b9465b85f1a399..4a28a850998c052bdd88ce597d5e2d33d064a4e3 100644 (file)
@@ -241,6 +241,10 @@ struct mpc52xx_cdm {
 
 #ifndef __ASSEMBLY__
 
+extern void __iomem * mpc52xx_find_and_map(const char *);
+extern unsigned int mpc52xx_find_ipb_freq(struct device_node *node);
+extern void mpc52xx_setup_cpu(void);
+
 extern void mpc52xx_init_irq(void);
 extern unsigned int mpc52xx_get_irq(void);