1 files changed, 129 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c
new file mode 100644
index 000000000000..422c8faef593
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_lbc.c
@@ -0,0 +1,129 @@
+/*
+ * Freescale LBC and UPM routines.
+ *
+ * Copyright (c) 2007-2008  MontaVista Software, Inc.
+ *
+ * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <asm/fsl_lbc.h>
+
+spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock);
+
+struct fsl_lbc_regs __iomem *fsl_lbc_regs;
+EXPORT_SYMBOL(fsl_lbc_regs);
+
+static char __initdata *compat_lbc[] = {
+        "fsl,pq2-localbus",
+        "fsl,pq2pro-localbus",
+        "fsl,pq3-localbus",
+        "fsl,elbc",
+};
+
+static int __init fsl_lbc_init(void)
+{
+        struct device_node *lbus;
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(compat_lbc); i++) {
+                lbus = of_find_compatible_node(NULL, NULL, compat_lbc[i]);
+                if (lbus)
+                        goto found;
+        }
+        return -ENODEV;
+
+found:
+        fsl_lbc_regs = of_iomap(lbus, 0);
+        of_node_put(lbus);
+        if (!fsl_lbc_regs)
+                return -ENOMEM;
+        return 0;
+}
+arch_initcall(fsl_lbc_init);
+
+/**
+ * fsl_lbc_find - find Localbus bank
+ * @addr_base:  base address of the memory bank
+ *
+ * This function walks LBC banks comparing "Base address" field of the BR
+ * registers with the supplied addr_base argument. When bases match this
+ * function returns bank number (starting with 0), otherwise it returns
+ * appropriate errno value.
+ */
+int fsl_lbc_find(phys_addr_t addr_base)
+{
+        int i;
+
+        if (!fsl_lbc_regs)
+                return -ENODEV;
+
+        for (i = 0; i < ARRAY_SIZE(fsl_lbc_regs->bank); i++) {
+                __be32 br = in_be32(&fsl_lbc_regs->bank[i].br);
+                __be32 or = in_be32(&fsl_lbc_regs->bank[i].or);
+
+                if (br & BR_V && (br & or & BR_BA) == addr_base)
+                        return i;
+        }
+
+        return -ENOENT;
+}
+EXPORT_SYMBOL(fsl_lbc_find);
+
+/**
+ * fsl_upm_find - find pre-programmed UPM via base address
+ * @addr_base:  base address of the memory bank controlled by the UPM
+ * @upm:        pointer to the allocated fsl_upm structure
+ *
+ * This function fills fsl_upm structure so you can use it with the rest of
+ * UPM API. On success this function returns 0, otherwise it returns
+ * appropriate errno value.
+ */
+int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm)
+{
+        int bank;
+        __be32 br;
+
+        bank = fsl_lbc_find(addr_base);
+        if (bank < 0)
+                return bank;
+
+        br = in_be32(&fsl_lbc_regs->bank[bank].br);
+
+        switch (br & BR_MSEL) {
+        case BR_MS_UPMA:
+                upm->mxmr = &fsl_lbc_regs->mamr;
+                break;
+        case BR_MS_UPMB:
+                upm->mxmr = &fsl_lbc_regs->mbmr;
+                break;
+        case BR_MS_UPMC:
+                upm->mxmr = &fsl_lbc_regs->mcmr;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        switch (br & BR_PS) {
+        case BR_PS_8:
+                upm->width = 8;
+                break;
+        case BR_PS_16:
+                upm->width = 16;
+                break;
+        case BR_PS_32:
+                upm->width = 32;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL(fsl_upm_find);