4 * Author: Scott Wood <scottwood@freescale.com>
6 * Copyright 2007 Freescale Semiconductor, Inc.
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>
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.
20 #include <linux/init.h>
21 #include <linux/of_device.h>
22 #include <linux/spinlock.h>
27 #include <asm/system.h>
28 #include <asm/rheap.h>
31 #include <mm/mmu_decl.h>
33 #if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
34 #include <linux/of_gpio.h>
37 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
38 static u32 __iomem *cpm_udbg_txdesc =
39 (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
41 static void udbg_putc_cpm(char c)
43 u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
48 while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
52 out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
55 void __init udbg_init_cpm(void)
57 if (cpm_udbg_txdesc) {
59 setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
61 udbg_putc = udbg_putc_cpm;
66 static spinlock_t cpm_muram_lock;
67 static rh_block_t cpm_boot_muram_rh_block[16];
68 static rh_info_t cpm_muram_info;
69 static u8 __iomem *muram_vbase;
70 static phys_addr_t muram_pbase;
72 /* Max address size we deal with */
73 #define OF_MAX_ADDR_CELLS 4
75 int __init cpm_muram_init(void)
77 struct device_node *np;
79 u32 zero[OF_MAX_ADDR_CELLS] = {};
80 resource_size_t max = 0;
84 spin_lock_init(&cpm_muram_lock);
85 /* initialize the info header */
86 rh_init(&cpm_muram_info, 1,
87 sizeof(cpm_boot_muram_rh_block) /
88 sizeof(cpm_boot_muram_rh_block[0]),
89 cpm_boot_muram_rh_block);
91 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
93 /* try legacy bindings */
94 np = of_find_node_by_name(NULL, "data-only");
96 printk(KERN_ERR "Cannot find CPM muram data node");
102 muram_pbase = of_translate_address(np, zero);
103 if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
104 printk(KERN_ERR "Cannot translate zero through CPM muram node");
109 while (of_address_to_resource(np, i++, &r) == 0) {
113 rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
114 r.end - r.start + 1);
117 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
119 printk(KERN_ERR "Cannot map CPM muram");
129 * cpm_muram_alloc - allocate the requested size worth of multi-user ram
130 * @size: number of bytes to allocate
131 * @align: requested alignment, in bytes
133 * This function returns an offset into the muram area.
134 * Use cpm_dpram_addr() to get the virtual address of the area.
135 * Use cpm_muram_free() to free the allocation.
137 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
142 spin_lock_irqsave(&cpm_muram_lock, flags);
143 cpm_muram_info.alignment = align;
144 start = rh_alloc(&cpm_muram_info, size, "commproc");
145 spin_unlock_irqrestore(&cpm_muram_lock, flags);
149 EXPORT_SYMBOL(cpm_muram_alloc);
152 * cpm_muram_free - free a chunk of multi-user ram
153 * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
155 int cpm_muram_free(unsigned long offset)
160 spin_lock_irqsave(&cpm_muram_lock, flags);
161 ret = rh_free(&cpm_muram_info, offset);
162 spin_unlock_irqrestore(&cpm_muram_lock, flags);
166 EXPORT_SYMBOL(cpm_muram_free);
169 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
170 * @offset: the offset into the muram area to reserve
171 * @size: the number of bytes to reserve
173 * This function returns "start" on success, -ENOMEM on failure.
174 * Use cpm_dpram_addr() to get the virtual address of the area.
175 * Use cpm_muram_free() to free the allocation.
177 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
182 spin_lock_irqsave(&cpm_muram_lock, flags);
183 cpm_muram_info.alignment = 1;
184 start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
185 spin_unlock_irqrestore(&cpm_muram_lock, flags);
189 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
192 * cpm_muram_addr - turn a muram offset into a virtual address
193 * @offset: muram offset to convert
195 void __iomem *cpm_muram_addr(unsigned long offset)
197 return muram_vbase + offset;
199 EXPORT_SYMBOL(cpm_muram_addr);
201 unsigned long cpm_muram_offset(void __iomem *addr)
203 return addr - (void __iomem *)muram_vbase;
205 EXPORT_SYMBOL(cpm_muram_offset);
208 * cpm_muram_dma - turn a muram virtual address into a DMA address
209 * @offset: virtual address from cpm_muram_addr() to convert
211 dma_addr_t cpm_muram_dma(void __iomem *addr)
213 return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
215 EXPORT_SYMBOL(cpm_muram_dma);
217 #if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
219 struct cpm2_ioports {
220 u32 dir, par, sor, odr, dat;
224 struct cpm2_gpio32_chip {
225 struct of_mm_gpio_chip mm_gc;
228 /* shadowed data register to clear/set bits safely */
232 static inline struct cpm2_gpio32_chip *
233 to_cpm2_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
235 return container_of(mm_gc, struct cpm2_gpio32_chip, mm_gc);
238 static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
240 struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
241 struct cpm2_ioports __iomem *iop = mm_gc->regs;
243 cpm2_gc->cpdata = in_be32(&iop->dat);
246 static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
248 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
249 struct cpm2_ioports __iomem *iop = mm_gc->regs;
252 pin_mask = 1 << (31 - gpio);
254 return !!(in_be32(&iop->dat) & pin_mask);
257 static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
260 struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
261 struct cpm2_ioports __iomem *iop = mm_gc->regs;
264 cpm2_gc->cpdata |= pin_mask;
266 cpm2_gc->cpdata &= ~pin_mask;
268 out_be32(&iop->dat, cpm2_gc->cpdata);
271 static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
273 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
274 struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
276 u32 pin_mask = 1 << (31 - gpio);
278 spin_lock_irqsave(&cpm2_gc->lock, flags);
280 __cpm2_gpio32_set(mm_gc, pin_mask, value);
282 spin_unlock_irqrestore(&cpm2_gc->lock, flags);
285 static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
287 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
288 struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
289 struct cpm2_ioports __iomem *iop = mm_gc->regs;
291 u32 pin_mask = 1 << (31 - gpio);
293 spin_lock_irqsave(&cpm2_gc->lock, flags);
295 setbits32(&iop->dir, pin_mask);
296 __cpm2_gpio32_set(mm_gc, pin_mask, val);
298 spin_unlock_irqrestore(&cpm2_gc->lock, flags);
303 static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
305 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
306 struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
307 struct cpm2_ioports __iomem *iop = mm_gc->regs;
309 u32 pin_mask = 1 << (31 - gpio);
311 spin_lock_irqsave(&cpm2_gc->lock, flags);
313 clrbits32(&iop->dir, pin_mask);
315 spin_unlock_irqrestore(&cpm2_gc->lock, flags);
320 int cpm2_gpiochip_add32(struct device_node *np)
322 struct cpm2_gpio32_chip *cpm2_gc;
323 struct of_mm_gpio_chip *mm_gc;
324 struct of_gpio_chip *of_gc;
325 struct gpio_chip *gc;
327 cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL);
331 spin_lock_init(&cpm2_gc->lock);
333 mm_gc = &cpm2_gc->mm_gc;
334 of_gc = &mm_gc->of_gc;
337 mm_gc->save_regs = cpm2_gpio32_save_regs;
338 of_gc->gpio_cells = 2;
340 gc->direction_input = cpm2_gpio32_dir_in;
341 gc->direction_output = cpm2_gpio32_dir_out;
342 gc->get = cpm2_gpio32_get;
343 gc->set = cpm2_gpio32_set;
345 return of_mm_gpiochip_add(np, mm_gc);
347 #endif /* CONFIG_CPM2 || CONFIG_8xx_GPIO */