1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun ** linux/amiga/chipram.c
4*4882a593Smuzhiyun **
5*4882a593Smuzhiyun ** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org>
6*4882a593Smuzhiyun ** - 64-bit aligned allocations for full AGA compatibility
7*4882a593Smuzhiyun **
8*4882a593Smuzhiyun ** Rewritten 15/9/2000 by Geert to use resource management
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/types.h>
12*4882a593Smuzhiyun #include <linux/kernel.h>
13*4882a593Smuzhiyun #include <linux/mm.h>
14*4882a593Smuzhiyun #include <linux/init.h>
15*4882a593Smuzhiyun #include <linux/ioport.h>
16*4882a593Smuzhiyun #include <linux/slab.h>
17*4882a593Smuzhiyun #include <linux/string.h>
18*4882a593Smuzhiyun #include <linux/module.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #include <asm/atomic.h>
21*4882a593Smuzhiyun #include <asm/page.h>
22*4882a593Smuzhiyun #include <asm/amigahw.h>
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun unsigned long amiga_chip_size;
25*4882a593Smuzhiyun EXPORT_SYMBOL(amiga_chip_size);
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun static struct resource chipram_res = {
28*4882a593Smuzhiyun .name = "Chip RAM", .start = CHIP_PHYSADDR
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun static atomic_t chipavail;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun
amiga_chip_init(void)33*4882a593Smuzhiyun void __init amiga_chip_init(void)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun if (!AMIGAHW_PRESENT(CHIP_RAM))
36*4882a593Smuzhiyun return;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun chipram_res.end = CHIP_PHYSADDR + amiga_chip_size - 1;
39*4882a593Smuzhiyun request_resource(&iomem_resource, &chipram_res);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun atomic_set(&chipavail, amiga_chip_size);
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun
amiga_chip_alloc(unsigned long size,const char * name)45*4882a593Smuzhiyun void *amiga_chip_alloc(unsigned long size, const char *name)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun struct resource *res;
48*4882a593Smuzhiyun void *p;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun res = kzalloc(sizeof(struct resource), GFP_KERNEL);
51*4882a593Smuzhiyun if (!res)
52*4882a593Smuzhiyun return NULL;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun res->name = name;
55*4882a593Smuzhiyun p = amiga_chip_alloc_res(size, res);
56*4882a593Smuzhiyun if (!p) {
57*4882a593Smuzhiyun kfree(res);
58*4882a593Smuzhiyun return NULL;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun return p;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun EXPORT_SYMBOL(amiga_chip_alloc);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun /*
67*4882a593Smuzhiyun * Warning:
68*4882a593Smuzhiyun * amiga_chip_alloc_res is meant only for drivers that need to
69*4882a593Smuzhiyun * allocate Chip RAM before kmalloc() is functional. As a consequence,
70*4882a593Smuzhiyun * those drivers must not free that Chip RAM afterwards.
71*4882a593Smuzhiyun */
72*4882a593Smuzhiyun
amiga_chip_alloc_res(unsigned long size,struct resource * res)73*4882a593Smuzhiyun void *amiga_chip_alloc_res(unsigned long size, struct resource *res)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun int error;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun /* round up */
78*4882a593Smuzhiyun size = PAGE_ALIGN(size);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun pr_debug("amiga_chip_alloc_res: allocate %lu bytes\n", size);
81*4882a593Smuzhiyun error = allocate_resource(&chipram_res, res, size, 0, UINT_MAX,
82*4882a593Smuzhiyun PAGE_SIZE, NULL, NULL);
83*4882a593Smuzhiyun if (error < 0) {
84*4882a593Smuzhiyun pr_err("amiga_chip_alloc_res: allocate_resource() failed %d!\n",
85*4882a593Smuzhiyun error);
86*4882a593Smuzhiyun return NULL;
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun atomic_sub(size, &chipavail);
90*4882a593Smuzhiyun pr_debug("amiga_chip_alloc_res: returning %pR\n", res);
91*4882a593Smuzhiyun return ZTWO_VADDR(res->start);
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
amiga_chip_free(void * ptr)94*4882a593Smuzhiyun void amiga_chip_free(void *ptr)
95*4882a593Smuzhiyun {
96*4882a593Smuzhiyun unsigned long start = ZTWO_PADDR(ptr);
97*4882a593Smuzhiyun struct resource *res;
98*4882a593Smuzhiyun unsigned long size;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun res = lookup_resource(&chipram_res, start);
101*4882a593Smuzhiyun if (!res) {
102*4882a593Smuzhiyun pr_err("amiga_chip_free: trying to free nonexistent region at "
103*4882a593Smuzhiyun "%p\n", ptr);
104*4882a593Smuzhiyun return;
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun size = resource_size(res);
108*4882a593Smuzhiyun pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr);
109*4882a593Smuzhiyun atomic_add(size, &chipavail);
110*4882a593Smuzhiyun release_resource(res);
111*4882a593Smuzhiyun kfree(res);
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun EXPORT_SYMBOL(amiga_chip_free);
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun
amiga_chip_avail(void)116*4882a593Smuzhiyun unsigned long amiga_chip_avail(void)
117*4882a593Smuzhiyun {
118*4882a593Smuzhiyun unsigned long n = atomic_read(&chipavail);
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun pr_debug("amiga_chip_avail : %lu bytes\n", n);
121*4882a593Smuzhiyun return n;
122*4882a593Smuzhiyun }
123*4882a593Smuzhiyun EXPORT_SYMBOL(amiga_chip_avail);
124*4882a593Smuzhiyun
125