[POWERPC] MPC5200: Don't make firmware fixups into common code

The Lite5200 u-boot image doesn't entirely configure the processor
correctly and so Linux needs to fixup the cpu setup in setup_arch.  Fixing
the CPU setup is good, but making it into common code is not a good idea.

New board ports should be encouraged not to take the lead of the lite5200
and instead get their firmware to setup the CPU the right way.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NSylvain Munaut <tnt@246tnt.com>

arch/powerpc/platforms/52xx/lite5200.c

@@ -30,19 +30,56 @@
  *
  */
 
+/*
+ * Fix clock configuration.
+ *
+ * Firmware is supposed to be responsible for this.  If you are creating a
+ * new board port, do *NOT* duplicate this code.  Fix your boot firmware
+ * to set it correctly in the first place
+ */
+static void __init
+lite5200_fix_clock_config(void)
+{
+	struct mpc52xx_cdm  __iomem *cdm;
+
+	/* Map zones */
+	cdm = mpc52xx_find_and_map("mpc5200-cdm");
+	if (!cdm) {
+		printk(KERN_ERR "%s() failed; expect abnormal behaviour\n",
+		       __FUNCTION__);
+		return;
+	}
+
+	/* 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);
+
+	/* Unmap the regs */
+	iounmap(cdm);
+}
+
+/*
+ * Fix setting of port_config register.
+ *
+ * Firmware is supposed to be responsible for this.  If you are creating a
+ * new board port, do *NOT* duplicate this code.  Fix your boot firmware
+ * to set it correctly in the first place
+ */
 static void __init
-lite5200_setup_cpu(void)
+lite5200_fix_port_config(void)
 {
 	struct mpc52xx_gpio __iomem *gpio;
 	u32 port_config;
 
-	/* Map zones */
 	gpio = mpc52xx_find_and_map("mpc5200-gpio");
 	if (!gpio) {
-		printk(KERN_ERR __FILE__ ": "
-			"Error while mapping GPIO register for port config. "
-			"Expect some abnormal behavior\n");
-		goto error;
+		printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
+		       __FUNCTION__);
+		return;
 	}
 
 	/* Set port config */
@@ -61,7 +98,6 @@ lite5200_setup_cpu(void)
 	out_be32(&gpio->port_config, port_config);
 
 	/* Unmap zone */
-error:
 	iounmap(gpio);
 }
 
@@ -100,9 +136,12 @@ static void __init lite5200_setup_arch(void)
 	if (ppc_md.progress)
 		ppc_md.progress("lite5200_setup_arch()", 0);
 
-	/* CPU & Port mux setup */
-	mpc52xx_setup_cpu();	/* Generic */
-	lite5200_setup_cpu();	/* Platorm specific */
+	/* Fix things that firmware should have done. */
+	lite5200_fix_clock_config();
+	lite5200_fix_port_config();
+
+	/* Some mpc5200 & mpc5200b related configuration */
+	mpc5200_setup_xlb_arbiter();
 
 #ifdef CONFIG_PM
 	mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;

arch/powerpc/platforms/52xx/mpc52xx_common.c

@@ -75,44 +75,33 @@ mpc52xx_find_ipb_freq(struct device_node *node)
 EXPORT_SYMBOL(mpc52xx_find_ipb_freq);
 
 
+/*
+ * Configure the XLB arbiter settings to match what Linux expects.
+ */
 void __init
-mpc52xx_setup_cpu(void)
+mpc5200_setup_xlb_arbiter(void)
 {
-	struct mpc52xx_cdm  __iomem *cdm;
 	struct mpc52xx_xlb  __iomem *xlb;
 
-	/* Map zones */
-	cdm = mpc52xx_find_and_map("mpc5200-cdm");
 	xlb = mpc52xx_find_and_map("mpc5200-xlb");
-
-	if (!cdm || !xlb) {
+	if (!xlb) {
 		printk(KERN_ERR __FILE__ ": "
-			"Error while mapping CDM/XLB during mpc52xx_setup_cpu. "
+			"Error mapping XLB in mpc52xx_setup_cpu().  "
 			"Expect some abnormal behavior\n");
-		goto unmap_regs;
+		return;
 	}
 
-	/* 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 ...) */
+	/* 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);
+	iounmap(xlb);
 }
 
 void __init

include/asm-powerpc/mpc52xx.h

@@ -243,7 +243,7 @@ struct mpc52xx_cdm {
 
 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 mpc5200_setup_xlb_arbiter(void);
 extern void mpc52xx_declare_of_platform_devices(void);
 
 extern void mpc52xx_init_irq(void);