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git.ipfire.org Git - people/ms/u-boot.git/blob - cpu/mpc8260/commproc.c
2 * This file is based on "arch/ppc/8260_io/commproc.c" - here is it's
5 * General Purpose functions for the global management of the
6 * 8260 Communication Processor Module.
7 * Copyright (c) 1999 Dan Malek (dmalek@jlc.net)
8 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
11 * In addition to the individual control of the communication
12 * channels, there are a few functions that globally affect the
13 * communication processor.
15 * Buffer descriptors must be allocated from the dual ported memory
16 * space. The allocator for that is here. When the communication
17 * process is reset, we reclaim the memory available. There is
18 * currently no deallocator for this memory.
21 #include <asm/cpm_8260.h>
24 * because we have stack and init data in dual port ram
25 * we must reduce the size
27 #undef CPM_DATAONLY_SIZE
28 #define CPM_DATAONLY_SIZE ((uint)(8 * 1024) - CPM_DATAONLY_BASE)
33 DECLARE_GLOBAL_DATA_PTR
;
35 volatile immap_t
*immr
= (immap_t
*)CFG_IMMR
;
38 /* Reclaim the DP memory for our use.
40 gd
->dp_alloc_base
= CPM_DATAONLY_BASE
;
41 gd
->dp_alloc_top
= gd
->dp_alloc_base
+ CPM_DATAONLY_SIZE
;
46 immr
->im_cpm
.cp_cpcr
= CPM_CR_RST
;
48 do { /* Spin until command processed */
49 __asm__
__volatile__ ("eieio");
50 } while ((immr
->im_cpm
.cp_cpcr
& CPM_CR_FLG
) && ++count
< 1000000);
52 #ifdef CONFIG_HARD_I2C
53 *((unsigned short*)(&immr
->im_dprambase
[PROFF_I2C_BASE
])) = 0;
57 /* Allocate some memory from the dual ported ram.
58 * To help protocols with object alignment restrictions, we do that
62 m8260_cpm_dpalloc(uint size
, uint align
)
64 DECLARE_GLOBAL_DATA_PTR
;
66 volatile immap_t
*immr
= (immap_t
*)CFG_IMMR
;
71 align_mask
= align
- 1;
72 savebase
= gd
->dp_alloc_base
;
74 if ((off
= (gd
->dp_alloc_base
& align_mask
)) != 0)
75 gd
->dp_alloc_base
+= (align
- off
);
77 if ((off
= size
& align_mask
) != 0)
80 if ((gd
->dp_alloc_base
+ size
) >= gd
->dp_alloc_top
) {
81 gd
->dp_alloc_base
= savebase
;
82 panic("m8260_cpm_dpalloc: ran out of dual port ram!");
85 retloc
= gd
->dp_alloc_base
;
86 gd
->dp_alloc_base
+= size
;
88 memset((void *)&immr
->im_dprambase
[retloc
], 0, size
);
93 /* We also own one page of host buffer space for the allocation of
94 * UART "fifos" and the like.
97 m8260_cpm_hostalloc(uint size
, uint align
)
99 /* the host might not even have RAM yet - just use dual port RAM */
100 return (m8260_cpm_dpalloc(size
, align
));
103 /* Set a baud rate generator. This needs lots of work. There are
104 * eight BRGs, which can be connected to the CPM channels or output
105 * as clocks. The BRGs are in two different block of internal
106 * memory mapped space.
107 * The baud rate clock is the system clock divided by something.
108 * It was set up long ago during the initial boot phase and is
110 * Baud rate clocks are zero-based in the driver code (as that maps
111 * to port numbers). Documentation uses 1-based numbering.
113 #define BRG_INT_CLK gd->brg_clk
114 #define BRG_UART_CLK ((BRG_INT_CLK + 15) / 16)
116 /* This function is used by UARTS, or anything else that uses a 16x
120 m8260_cpm_setbrg(uint brg
, uint rate
)
122 DECLARE_GLOBAL_DATA_PTR
;
124 volatile immap_t
*immr
= (immap_t
*)CFG_IMMR
;
127 /* This is good enough to get SMCs running.....
130 bp
= (uint
*)&immr
->im_brgc1
;
133 bp
= (uint
*)&immr
->im_brgc5
;
137 *bp
= (((((BRG_UART_CLK
+rate
-1)/rate
)-1)&0xfff)<<1)|CPM_BRG_EN
;
140 /* This function is used to set high speed synchronous baud rate
144 m8260_cpm_fastbrg(uint brg
, uint rate
, int div16
)
146 DECLARE_GLOBAL_DATA_PTR
;
148 volatile immap_t
*immr
= (immap_t
*)CFG_IMMR
;
151 /* This is good enough to get SMCs running.....
154 bp
= (uint
*)&immr
->im_brgc1
;
157 bp
= (uint
*)&immr
->im_brgc5
;
161 *bp
= (((((BRG_INT_CLK
+rate
-1)/rate
)-1)&0xfff)<<1)|CPM_BRG_EN
;
163 *bp
|= CPM_BRG_DIV16
;
166 /* This function is used to set baud rate generators using an external
167 * clock source and 16x oversampling.
171 m8260_cpm_extcbrg(uint brg
, uint rate
, uint extclk
, int pinsel
)
173 volatile immap_t
*immr
= (immap_t
*)CFG_IMMR
;
177 bp
= (uint
*)&immr
->im_brgc1
;
180 bp
= (uint
*)&immr
->im_brgc5
;
184 *bp
= ((((((extclk
/16)+rate
-1)/rate
)-1)&0xfff)<<1)|CPM_BRG_EN
;
186 *bp
|= CPM_BRG_EXTC_CLK3_9
;
188 *bp
|= CPM_BRG_EXTC_CLK5_15
;
191 #if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER)
193 void post_word_store (ulong a
)
195 volatile ulong
*save_addr
=
196 (volatile ulong
*)(CFG_IMMR
+ CPM_POST_WORD_ADDR
);
201 ulong
post_word_load (void)
203 volatile ulong
*save_addr
=
204 (volatile ulong
*)(CFG_IMMR
+ CPM_POST_WORD_ADDR
);
209 #endif /* CONFIG_POST || CONFIG_LOGBUFFER*/