1 /* 2 * Common CPM code 3 * 4 * Author: Scott Wood <scottwood@freescale.com> 5 * 6 * Copyright 2007 Freescale Semiconductor, Inc. 7 * 8 * Some parts derived from commproc.c/cpm2_common.c, which is: 9 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net) 10 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com> 11 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com) 12 * 2006 (c) MontaVista Software, Inc. 13 * Vitaly Bordug <vbordug@ru.mvista.com> 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of version 2 of the GNU General Public License as 17 * published by the Free Software Foundation. 18 */ 19 20 #include <linux/init.h> 21 #include <linux/of_device.h> 22 23 #include <asm/udbg.h> 24 #include <asm/io.h> 25 #include <asm/system.h> 26 #include <asm/rheap.h> 27 #include <asm/cpm.h> 28 29 #include <mm/mmu_decl.h> 30 31 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM 32 static u32 __iomem *cpm_udbg_txdesc = 33 (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR; 34 35 static void udbg_putc_cpm(char c) 36 { 37 u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]); 38 39 if (c == '\n') 40 udbg_putc('\r'); 41 42 while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000) 43 ; 44 45 out_8(txbuf, c); 46 out_be32(&cpm_udbg_txdesc[0], 0xa0000001); 47 } 48 49 void __init udbg_init_cpm(void) 50 { 51 if (cpm_udbg_txdesc) { 52 #ifdef CONFIG_CPM2 53 setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO); 54 #endif 55 udbg_putc = udbg_putc_cpm; 56 udbg_putc('X'); 57 } 58 } 59 #endif 60 61 static spinlock_t cpm_muram_lock; 62 static rh_block_t cpm_boot_muram_rh_block[16]; 63 static rh_info_t cpm_muram_info; 64 static u8 __iomem *muram_vbase; 65 static phys_addr_t muram_pbase; 66 67 /* Max address size we deal with */ 68 #define OF_MAX_ADDR_CELLS 4 69 70 int __init cpm_muram_init(void) 71 { 72 struct device_node *np; 73 struct resource r; 74 u32 zero[OF_MAX_ADDR_CELLS] = {}; 75 resource_size_t max = 0; 76 int i = 0; 77 int ret = 0; 78 79 spin_lock_init(&cpm_muram_lock); 80 /* initialize the info header */ 81 rh_init(&cpm_muram_info, 1, 82 sizeof(cpm_boot_muram_rh_block) / 83 sizeof(cpm_boot_muram_rh_block[0]), 84 cpm_boot_muram_rh_block); 85 86 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data"); 87 if (!np) { 88 printk(KERN_ERR "Cannot find CPM muram data node"); 89 ret = -ENODEV; 90 goto out; 91 } 92 93 muram_pbase = of_translate_address(np, zero); 94 if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) { 95 printk(KERN_ERR "Cannot translate zero through CPM muram node"); 96 ret = -ENODEV; 97 goto out; 98 } 99 100 while (of_address_to_resource(np, i++, &r) == 0) { 101 if (r.end > max) 102 max = r.end; 103 104 rh_attach_region(&cpm_muram_info, r.start - muram_pbase, 105 r.end - r.start + 1); 106 } 107 108 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1); 109 if (!muram_vbase) { 110 printk(KERN_ERR "Cannot map CPM muram"); 111 ret = -ENOMEM; 112 } 113 114 out: 115 of_node_put(np); 116 return ret; 117 } 118 119 /** 120 * cpm_muram_alloc - allocate the requested size worth of multi-user ram 121 * @size: number of bytes to allocate 122 * @align: requested alignment, in bytes 123 * 124 * This function returns an offset into the muram area. 125 * Use cpm_dpram_addr() to get the virtual address of the area. 126 * Use cpm_muram_free() to free the allocation. 127 */ 128 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align) 129 { 130 unsigned long start; 131 unsigned long flags; 132 133 spin_lock_irqsave(&cpm_muram_lock, flags); 134 cpm_muram_info.alignment = align; 135 start = rh_alloc(&cpm_muram_info, size, "commproc"); 136 spin_unlock_irqrestore(&cpm_muram_lock, flags); 137 138 return start; 139 } 140 EXPORT_SYMBOL(cpm_muram_alloc); 141 142 /** 143 * cpm_muram_free - free a chunk of multi-user ram 144 * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). 145 */ 146 int cpm_muram_free(unsigned long offset) 147 { 148 int ret; 149 unsigned long flags; 150 151 spin_lock_irqsave(&cpm_muram_lock, flags); 152 ret = rh_free(&cpm_muram_info, offset); 153 spin_unlock_irqrestore(&cpm_muram_lock, flags); 154 155 return ret; 156 } 157 EXPORT_SYMBOL(cpm_muram_free); 158 159 /** 160 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram 161 * @offset: the offset into the muram area to reserve 162 * @size: the number of bytes to reserve 163 * 164 * This function returns "start" on success, -ENOMEM on failure. 165 * Use cpm_dpram_addr() to get the virtual address of the area. 166 * Use cpm_muram_free() to free the allocation. 167 */ 168 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) 169 { 170 unsigned long start; 171 unsigned long flags; 172 173 spin_lock_irqsave(&cpm_muram_lock, flags); 174 cpm_muram_info.alignment = 1; 175 start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc"); 176 spin_unlock_irqrestore(&cpm_muram_lock, flags); 177 178 return start; 179 } 180 EXPORT_SYMBOL(cpm_muram_alloc_fixed); 181 182 /** 183 * cpm_muram_addr - turn a muram offset into a virtual address 184 * @offset: muram offset to convert 185 */ 186 void __iomem *cpm_muram_addr(unsigned long offset) 187 { 188 return muram_vbase + offset; 189 } 190 EXPORT_SYMBOL(cpm_muram_addr); 191 192 /** 193 * cpm_muram_dma - turn a muram virtual address into a DMA address 194 * @offset: virtual address from cpm_muram_addr() to convert 195 */ 196 dma_addr_t cpm_muram_dma(void __iomem *addr) 197 { 198 return muram_pbase + ((u8 __iomem *)addr - muram_vbase); 199 } 200 EXPORT_SYMBOL(cpm_muram_dma); 201