| Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Freescale LBC and UPM routines. |
| 3 | * |
| 4 | * Copyright (c) 2007-2008 MontaVista Software, Inc. |
| 5 | * |
| 6 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/of.h> |
| 16 | #include <asm/fsl_lbc.h> |
| 17 | |
| 18 | spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock); |
| 19 | |
| 20 | struct fsl_lbc_regs __iomem *fsl_lbc_regs; |
| 21 | EXPORT_SYMBOL(fsl_lbc_regs); |
| 22 | |
| 23 | static char __initdata *compat_lbc[] = { |
| 24 | "fsl,pq2-localbus", |
| 25 | "fsl,pq2pro-localbus", |
| 26 | "fsl,pq3-localbus", |
| 27 | "fsl,elbc", |
| 28 | }; |
| 29 | |
| 30 | static int __init fsl_lbc_init(void) |
| 31 | { |
| 32 | struct device_node *lbus; |
| 33 | int i; |
| 34 | |
| 35 | for (i = 0; i < ARRAY_SIZE(compat_lbc); i++) { |
| 36 | lbus = of_find_compatible_node(NULL, NULL, compat_lbc[i]); |
| 37 | if (lbus) |
| 38 | goto found; |
| 39 | } |
| 40 | return -ENODEV; |
| 41 | |
| 42 | found: |
| 43 | fsl_lbc_regs = of_iomap(lbus, 0); |
| 44 | of_node_put(lbus); |
| 45 | if (!fsl_lbc_regs) |
| 46 | return -ENOMEM; |
| 47 | return 0; |
| 48 | } |
| 49 | arch_initcall(fsl_lbc_init); |
| 50 | |
| 51 | /** |
| 52 | * fsl_lbc_find - find Localbus bank |
| 53 | * @addr_base: base address of the memory bank |
| 54 | * |
| 55 | * This function walks LBC banks comparing "Base address" field of the BR |
| 56 | * registers with the supplied addr_base argument. When bases match this |
| 57 | * function returns bank number (starting with 0), otherwise it returns |
| 58 | * appropriate errno value. |
| 59 | */ |
| 60 | int fsl_lbc_find(phys_addr_t addr_base) |
| 61 | { |
| 62 | int i; |
| 63 | |
| 64 | if (!fsl_lbc_regs) |
| 65 | return -ENODEV; |
| 66 | |
| 67 | for (i = 0; i < ARRAY_SIZE(fsl_lbc_regs->bank); i++) { |
| 68 | __be32 br = in_be32(&fsl_lbc_regs->bank[i].br); |
| 69 | __be32 or = in_be32(&fsl_lbc_regs->bank[i].or); |
| 70 | |
| 71 | if (br & BR_V && (br & or & BR_BA) == addr_base) |
| 72 | return i; |
| 73 | } |
| 74 | |
| 75 | return -ENOENT; |
| 76 | } |
| 77 | EXPORT_SYMBOL(fsl_lbc_find); |
| 78 | |
| 79 | /** |
| 80 | * fsl_upm_find - find pre-programmed UPM via base address |
| 81 | * @addr_base: base address of the memory bank controlled by the UPM |
| 82 | * @upm: pointer to the allocated fsl_upm structure |
| 83 | * |
| 84 | * This function fills fsl_upm structure so you can use it with the rest of |
| 85 | * UPM API. On success this function returns 0, otherwise it returns |
| 86 | * appropriate errno value. |
| 87 | */ |
| 88 | int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm) |
| 89 | { |
| 90 | int bank; |
| 91 | __be32 br; |
| 92 | |
| 93 | bank = fsl_lbc_find(addr_base); |
| 94 | if (bank < 0) |
| 95 | return bank; |
| 96 | |
| 97 | br = in_be32(&fsl_lbc_regs->bank[bank].br); |
| 98 | |
| 99 | switch (br & BR_MSEL) { |
| 100 | case BR_MS_UPMA: |
| 101 | upm->mxmr = &fsl_lbc_regs->mamr; |
| 102 | break; |
| 103 | case BR_MS_UPMB: |
| 104 | upm->mxmr = &fsl_lbc_regs->mbmr; |
| 105 | break; |
| 106 | case BR_MS_UPMC: |
| 107 | upm->mxmr = &fsl_lbc_regs->mcmr; |
| 108 | break; |
| 109 | default: |
| 110 | return -EINVAL; |
| 111 | } |
| 112 | |
| 113 | switch (br & BR_PS) { |
| 114 | case BR_PS_8: |
| 115 | upm->width = 8; |
| 116 | break; |
| 117 | case BR_PS_16: |
| 118 | upm->width = 16; |
| 119 | break; |
| 120 | case BR_PS_32: |
| 121 | upm->width = 32; |
| 122 | break; |
| 123 | default: |
| 124 | return -EINVAL; |
| 125 | } |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | EXPORT_SYMBOL(fsl_upm_find); |