1 /*
2  * Adapted for Motorola MPC8560 chips
3  * Xianghua Xiao <x.xiao@motorola.com>
4  *
5  * This file is based on "arch/powerpc/8260_io/commproc.c" - here is it's
6  * copyright notice:
7  *
8  * General Purpose functions for the global management of the
9  * 8220 Communication Processor Module.
10  * Copyright (c) 1999 Dan Malek (dmalek@jlc.net)
11  * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
12  *	2.3.99 Updates
13  * Copyright (c) 2003 Motorola,Inc.
14  *
15  * In addition to the individual control of the communication
16  * channels, there are a few functions that globally affect the
17  * communication processor.
18  *
19  * Buffer descriptors must be allocated from the dual ported memory
20  * space.  The allocator for that is here.  When the communication
21  * process is reset, we reclaim the memory available.  There is
22  * currently no deallocator for this memory.
23  */
24 #include <common.h>
25 #include <asm/cpm_85xx.h>
26 
27 DECLARE_GLOBAL_DATA_PTR;
28 
29 /*
30  * because we have stack and init data in dual port ram
31  * we must reduce the size
32  */
33 #undef	CPM_DATAONLY_SIZE
34 #define CPM_DATAONLY_SIZE	((uint)(8 * 1024) - CPM_DATAONLY_BASE)
35 
36 void
37 m8560_cpm_reset(void)
38 {
39 	volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
40 	volatile ulong count;
41 
42 	gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
43 
44 	/* Reclaim the DP memory for our use.
45 	*/
46 	gd->dp_alloc_base = CPM_DATAONLY_BASE;
47 	gd->dp_alloc_top = gd->dp_alloc_base + CPM_DATAONLY_SIZE;
48 
49 	/*
50 	 * Reset CPM
51 	 */
52 	cpm->im_cpm_cp.cpcr = CPM_CR_RST;
53 	count = 0;
54 	do {			/* Spin until command processed		*/
55 		__asm__ __volatile__ ("eieio");
56 	} while ((cpm->im_cpm_cp.cpcr & CPM_CR_FLG) && ++count < 1000000);
57 }
58 
59 /* Allocate some memory from the dual ported ram.
60  * To help protocols with object alignment restrictions, we do that
61  * if they ask.
62  */
63 uint
64 m8560_cpm_dpalloc(uint size, uint align)
65 {
66 	volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
67 	uint	retloc;
68 	uint	align_mask, off;
69 	uint	savebase;
70 
71 	align_mask = align - 1;
72 	savebase = gd->dp_alloc_base;
73 
74 	if ((off = (gd->dp_alloc_base & align_mask)) != 0)
75 		gd->dp_alloc_base += (align - off);
76 
77 	if ((off = size & align_mask) != 0)
78 		size += align - off;
79 
80 	if ((gd->dp_alloc_base + size) >= gd->dp_alloc_top) {
81 		gd->dp_alloc_base = savebase;
82 		panic("m8560_cpm_dpalloc: ran out of dual port ram!");
83 	}
84 
85 	retloc = gd->dp_alloc_base;
86 	gd->dp_alloc_base += size;
87 
88 	memset((void *)&(cpm->im_dprambase[retloc]), 0, size);
89 
90 	return(retloc);
91 }
92 
93 /* We also own one page of host buffer space for the allocation of
94  * UART "fifos" and the like.
95  */
96 uint
97 m8560_cpm_hostalloc(uint size, uint align)
98 {
99 	/* the host might not even have RAM yet - just use dual port RAM */
100 	return (m8560_cpm_dpalloc(size, align));
101 }
102 
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
109  * is given to us.
110  * Baud rate clocks are zero-based in the driver code (as that maps
111  * to port numbers).  Documentation uses 1-based numbering.
112  */
113 #define BRG_INT_CLK	gd->brg_clk
114 #define BRG_UART_CLK	((BRG_INT_CLK + 15) / 16)
115 
116 /* This function is used by UARTS, or anything else that uses a 16x
117  * oversampled clock.
118  */
119 void
120 m8560_cpm_setbrg(uint brg, uint rate)
121 {
122 	volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
123 	volatile uint	*bp;
124 
125 	/* This is good enough to get SMCs running.....
126 	*/
127 	if (brg < 4) {
128 		bp = (uint *)&(cpm->im_cpm_brg1.brgc1);
129 	}
130 	else {
131 		bp = (uint *)&(cpm->im_cpm_brg2.brgc5);
132 		brg -= 4;
133 	}
134 	bp += brg;
135 	*bp = (((((BRG_UART_CLK+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN;
136 }
137 
138 /* This function is used to set high speed synchronous baud rate
139  * clocks.
140  */
141 void
142 m8560_cpm_fastbrg(uint brg, uint rate, int div16)
143 {
144 	volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
145 	volatile uint	*bp;
146 
147 	/* This is good enough to get SMCs running.....
148 	*/
149 	if (brg < 4) {
150 		bp = (uint *)&(cpm->im_cpm_brg1.brgc1);
151 	}
152 	else {
153 		bp = (uint *)&(cpm->im_cpm_brg2.brgc5);
154 		brg -= 4;
155 	}
156 	bp += brg;
157 	*bp = (((((BRG_INT_CLK+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN;
158 	if (div16)
159 		*bp |= CPM_BRG_DIV16;
160 }
161 
162 /* This function is used to set baud rate generators using an external
163  * clock source and 16x oversampling.
164  */
165 
166 void
167 m8560_cpm_extcbrg(uint brg, uint rate, uint extclk, int pinsel)
168 {
169 	volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
170 	volatile uint	*bp;
171 
172 	if (brg < 4) {
173 		bp = (uint *)&(cpm->im_cpm_brg1.brgc1);
174 	}
175 	else {
176 		bp = (uint *)&(cpm->im_cpm_brg2.brgc5);
177 		brg -= 4;
178 	}
179 	bp += brg;
180 	*bp = ((((((extclk/16)+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN;
181 	if (pinsel == 0)
182 		*bp |= CPM_BRG_EXTC_CLK3_9;
183 	else
184 		*bp |= CPM_BRG_EXTC_CLK5_15;
185 }
186