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_cpm('\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 } 57 } 58 #endif 59 60 static spinlock_t cpm_muram_lock; 61 static rh_block_t cpm_boot_muram_rh_block[16]; 62 static rh_info_t cpm_muram_info; 63 static u8 __iomem *muram_vbase; 64 static phys_addr_t muram_pbase; 65 66 /* Max address size we deal with */ 67 #define OF_MAX_ADDR_CELLS 4 68 69 int __init cpm_muram_init(void) 70 { 71 struct device_node *np; 72 struct resource r; 73 u32 zero[OF_MAX_ADDR_CELLS] = {}; 74 resource_size_t max = 0; 75 int i = 0; 76 int ret = 0; 77 78 spin_lock_init(&cpm_muram_lock); 79 /* initialize the info header */ 80 rh_init(&cpm_muram_info, 1, 81 sizeof(cpm_boot_muram_rh_block) / 82 sizeof(cpm_boot_muram_rh_block[0]), 83 cpm_boot_muram_rh_block); 84 85 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data"); 86 if (!np) { 87 /* try legacy bindings */ 88 np = of_find_node_by_name(NULL, "data-only"); 89 if (!np) { 90 printk(KERN_ERR "Cannot find CPM muram data node"); 91 ret = -ENODEV; 92 goto out; 93 } 94 } 95 96 muram_pbase = of_translate_address(np, zero); 97 if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) { 98 printk(KERN_ERR "Cannot translate zero through CPM muram node"); 99 ret = -ENODEV; 100 goto out; 101 } 102 103 while (of_address_to_resource(np, i++, &r) == 0) { 104 if (r.end > max) 105 max = r.end; 106 107 rh_attach_region(&cpm_muram_info, r.start - muram_pbase, 108 r.end - r.start + 1); 109 } 110 111 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1); 112 if (!muram_vbase) { 113 printk(KERN_ERR "Cannot map CPM muram"); 114 ret = -ENOMEM; 115 } 116 117 out: 118 of_node_put(np); 119 return ret; 120 } 121 122 /** 123 * cpm_muram_alloc - allocate the requested size worth of multi-user ram 124 * @size: number of bytes to allocate 125 * @align: requested alignment, in bytes 126 * 127 * This function returns an offset into the muram area. 128 * Use cpm_dpram_addr() to get the virtual address of the area. 129 * Use cpm_muram_free() to free the allocation. 130 */ 131 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align) 132 { 133 unsigned long start; 134 unsigned long flags; 135 136 spin_lock_irqsave(&cpm_muram_lock, flags); 137 cpm_muram_info.alignment = align; 138 start = rh_alloc(&cpm_muram_info, size, "commproc"); 139 spin_unlock_irqrestore(&cpm_muram_lock, flags); 140 141 return start; 142 } 143 EXPORT_SYMBOL(cpm_muram_alloc); 144 145 /** 146 * cpm_muram_free - free a chunk of multi-user ram 147 * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). 148 */ 149 int cpm_muram_free(unsigned long offset) 150 { 151 int ret; 152 unsigned long flags; 153 154 spin_lock_irqsave(&cpm_muram_lock, flags); 155 ret = rh_free(&cpm_muram_info, offset); 156 spin_unlock_irqrestore(&cpm_muram_lock, flags); 157 158 return ret; 159 } 160 EXPORT_SYMBOL(cpm_muram_free); 161 162 /** 163 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram 164 * @offset: the offset into the muram area to reserve 165 * @size: the number of bytes to reserve 166 * 167 * This function returns "start" on success, -ENOMEM on failure. 168 * Use cpm_dpram_addr() to get the virtual address of the area. 169 * Use cpm_muram_free() to free the allocation. 170 */ 171 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) 172 { 173 unsigned long start; 174 unsigned long flags; 175 176 spin_lock_irqsave(&cpm_muram_lock, flags); 177 cpm_muram_info.alignment = 1; 178 start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc"); 179 spin_unlock_irqrestore(&cpm_muram_lock, flags); 180 181 return start; 182 } 183 EXPORT_SYMBOL(cpm_muram_alloc_fixed); 184 185 /** 186 * cpm_muram_addr - turn a muram offset into a virtual address 187 * @offset: muram offset to convert 188 */ 189 void __iomem *cpm_muram_addr(unsigned long offset) 190 { 191 return muram_vbase + offset; 192 } 193 EXPORT_SYMBOL(cpm_muram_addr); 194 195 unsigned long cpm_muram_offset(void __iomem *addr) 196 { 197 return addr - (void __iomem *)muram_vbase; 198 } 199 EXPORT_SYMBOL(cpm_muram_offset); 200 201 /** 202 * cpm_muram_dma - turn a muram virtual address into a DMA address 203 * @offset: virtual address from cpm_muram_addr() to convert 204 */ 205 dma_addr_t cpm_muram_dma(void __iomem *addr) 206 { 207 return muram_pbase + ((u8 __iomem *)addr - muram_vbase); 208 } 209 EXPORT_SYMBOL(cpm_muram_dma); 210