aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/au1000/csb250/board_setup.c
blob: 1c55c5f59d759ba5704b2fee60c18bb36c73eb5a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/*
 *
 * BRIEF MODULE DESCRIPTION
 *	Cogent CSB250 board setup.
 *
 * Copyright 2002 Cogent Computer Systems, Inc.
 *	dan@embeddededge.com
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/config.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/mc146818rtc.h>
#include <linux/delay.h>

#include <asm/cpu.h>
#include <asm/bootinfo.h>
#include <asm/irq.h>
#include <asm/keyboard.h>
#include <asm/mipsregs.h>
#include <asm/reboot.h>
#include <asm/pgtable.h>
#include <asm/au1000.h>
#include <asm/csb250.h>

extern int (*board_pci_idsel)(unsigned int devsel, int assert);
int	csb250_pci_idsel(unsigned int devsel, int assert);

void __init board_setup(void)
{
	u32 pin_func, pin_val;
	u32 sys_freqctrl, sys_clksrc;


	// set AUX clock to 12MHz * 8 = 96 MHz
	au_writel(8, SYS_AUXPLL);
	au_writel(0, SYS_PINSTATERD);
	udelay(100);

#if defined (CONFIG_USB_OHCI) || defined (CONFIG_AU1X00_USB_DEVICE)

	/* GPIO201 is input for PCMCIA card detect */
	/* GPIO203 is input for PCMCIA interrupt request */
	au_writel(au_readl(GPIO2_DIR) & (u32)(~((1<<1)|(1<<3))), GPIO2_DIR);

	/* zero and disable FREQ2 */
	sys_freqctrl = au_readl(SYS_FREQCTRL0);
	sys_freqctrl &= ~0xFFF00000;
	au_writel(sys_freqctrl, SYS_FREQCTRL0);

	/* zero and disable USBH/USBD clocks */
	sys_clksrc = au_readl(SYS_CLKSRC);
	sys_clksrc &= ~0x00007FE0;
	au_writel(sys_clksrc, SYS_CLKSRC);

	sys_freqctrl = au_readl(SYS_FREQCTRL0);
	sys_freqctrl &= ~0xFFF00000;

	sys_clksrc = au_readl(SYS_CLKSRC);
	sys_clksrc &= ~0x00007FE0;

	// FREQ2 = aux/2 = 48 MHz
	sys_freqctrl |= ((0<<22) | (1<<21) | (1<<20));
	au_writel(sys_freqctrl, SYS_FREQCTRL0);

	/*
	 * Route 48MHz FREQ2 into USB Host and/or Device
	 */
#ifdef CONFIG_USB_OHCI
	sys_clksrc |= ((4<<12) | (0<<11) | (0<<10));
#endif
#ifdef CONFIG_AU1X00_USB_DEVICE
	sys_clksrc |= ((4<<7) | (0<<6) | (0<<5));
#endif
	au_writel(sys_clksrc, SYS_CLKSRC);


	pin_func = au_readl(SYS_PINFUNC) & (u32)(~0x8000);
#ifndef CONFIG_AU1X00_USB_DEVICE
	// 2nd USB port is USB host
	pin_func |= 0x8000;
#endif
	au_writel(pin_func, SYS_PINFUNC);
#endif // defined (CONFIG_USB_OHCI) || defined (CONFIG_AU1X00_USB_DEVICE)

	/* Configure GPIO2....it's used by PCI among other things.
	*/

	/* Make everything but GP200 (PCI RST) an input until we get
	 * the pins set correctly.
	 */
	au_writel(0x00000001, GPIO2_DIR);

	/* Set the pins used for output.
	 * A zero bit will leave PCI reset, LEDs off, power up USB,
	 * IDSEL disabled.
	 */
	pin_val = ((3 << 30) | (7 << 19) | (1 << 17) | (1 << 16));
	au_writel(pin_val, GPIO2_OUTPUT);

	/* Set the output direction.
	*/
	pin_val = ((3 << 14) | (7 << 3) | (1 << 1) | (1 << 0));
	au_writel(pin_val, GPIO2_DIR);

#ifdef CONFIG_PCI
	/* Use FREQ1 for the PCI output clock.  We use the
	 * CPU clock of 384 MHz divided by 12 to get 32 MHz PCI.
	 * If Michael changes the CPU speed, we need to adjust
	 * that here as well :-).
	 */

	/* zero and disable FREQ1
	*/
	sys_freqctrl = au_readl(SYS_FREQCTRL0);
	sys_freqctrl &= ~0x000ffc00;
	au_writel(sys_freqctrl, SYS_FREQCTRL0);

	/* zero and disable PCI clock
	*/
	sys_clksrc = au_readl(SYS_CLKSRC);
	sys_clksrc &= ~0x000f8000;
	au_writel(sys_clksrc, SYS_CLKSRC);

	/* Get current values (which really should match above).
	*/
	sys_freqctrl = au_readl(SYS_FREQCTRL0);
	sys_freqctrl &= ~0x000ffc00;

	sys_clksrc = au_readl(SYS_CLKSRC);
	sys_clksrc &= ~0x000f8000;

	/* FREQ1 = cpu/12 = 32 MHz
	*/
	sys_freqctrl |= ((5<<12) | (1<<11) | (0<<10));
	au_writel(sys_freqctrl, SYS_FREQCTRL0);

	/* Just connect the clock without further dividing.
	*/
	sys_clksrc |= ((3<<17) | (0<<16) | (0<<15));
	au_writel(sys_clksrc, SYS_CLKSRC);

	udelay(1);

	/* Now that clocks should be running, take PCI out of reset.
	*/
	pin_val = au_readl(GPIO2_OUTPUT);
	pin_val |= ((1 << 16) | 1);
	au_writel(pin_val, GPIO2_OUTPUT);

	// Setup PCI bus controller
	au_writel(0, Au1500_PCI_CMEM);
	au_writel(0x00003fff, Au1500_CFG_BASE);

	/* We run big endian without any of the software byte swapping,
	 * so configure the PCI bridge to help us out.
	 */
	au_writel(0xf | (2<<6) | (1<<5) | (1<<4), Au1500_PCI_CFG);

	au_writel(0xf0000000, Au1500_PCI_MWMASK_DEV);
	au_writel(0, Au1500_PCI_MWBASE_REV_CCL);
	au_writel(0x02a00356, Au1500_PCI_STATCMD);
	au_writel(0x00003c04, Au1500_PCI_HDRTYPE);
	au_writel(0x00000008, Au1500_PCI_MBAR);
	au_sync();

	board_pci_idsel = csb250_pci_idsel;
#endif

	/* Enable sys bus clock divider when IDLE state or no bus activity. */
	au_writel(au_readl(SYS_POWERCTRL) | (0x3 << 5), SYS_POWERCTRL);

#ifdef CONFIG_RTC
	// Enable the RTC if not already enabled
	if (!(au_readl(0xac000028) & 0x20)) {
		printk("enabling clock ...\n");
		au_writel((au_readl(0xac000028) | 0x20), 0xac000028);
	}
	// Put the clock in BCD mode
	if (readl(0xac00002C) & 0x4) { /* reg B */
		au_writel(au_readl(0xac00002c) & ~0x4, 0xac00002c);
		au_sync();
	}
#endif
}

/* The IDSEL is selected in the GPIO2 register.  We will make device
 * 12 appear in slot 0 and device 13 appear in slot 1.
 */
int
csb250_pci_idsel(unsigned int devsel, int assert)
{
	int		retval;
	unsigned int	gpio2_pins;

	retval = 1;

	/* First, disable both selects, then assert the one requested.
	*/
	au_writel(0xc000c000, GPIO2_OUTPUT);
	au_sync();

	if (assert) {
		if (devsel == 12)
			gpio2_pins = 0x40000000;
		else if (devsel == 13)
			gpio2_pins = 0x80000000;
		else {
			gpio2_pins = 0xc000c000;
			retval = 0;
		}
		au_writel(gpio2_pins, GPIO2_OUTPUT);
	}
	au_sync();

	return retval;
}