42a3b4f25a
Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
240 lines
6.6 KiB
C
240 lines
6.6 KiB
C
/*
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*
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* BRIEF MODULE DESCRIPTION
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* Cogent CSB250 board setup.
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*
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* Copyright 2002 Cogent Computer Systems, Inc.
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* dan@embeddededge.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/console.h>
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#include <linux/mc146818rtc.h>
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#include <linux/delay.h>
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#include <asm/cpu.h>
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#include <asm/bootinfo.h>
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#include <asm/irq.h>
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#include <asm/keyboard.h>
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#include <asm/mipsregs.h>
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#include <asm/reboot.h>
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#include <asm/pgtable.h>
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#include <asm/au1000.h>
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#include <asm/csb250.h>
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extern int (*board_pci_idsel)(unsigned int devsel, int assert);
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int csb250_pci_idsel(unsigned int devsel, int assert);
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void __init board_setup(void)
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{
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u32 pin_func, pin_val;
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u32 sys_freqctrl, sys_clksrc;
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// set AUX clock to 12MHz * 8 = 96 MHz
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au_writel(8, SYS_AUXPLL);
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au_writel(0, SYS_PINSTATERD);
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udelay(100);
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#if defined (CONFIG_USB_OHCI) || defined (CONFIG_AU1X00_USB_DEVICE)
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/* GPIO201 is input for PCMCIA card detect */
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/* GPIO203 is input for PCMCIA interrupt request */
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au_writel(au_readl(GPIO2_DIR) & (u32)(~((1<<1)|(1<<3))), GPIO2_DIR);
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/* zero and disable FREQ2 */
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sys_freqctrl = au_readl(SYS_FREQCTRL0);
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sys_freqctrl &= ~0xFFF00000;
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au_writel(sys_freqctrl, SYS_FREQCTRL0);
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/* zero and disable USBH/USBD clocks */
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sys_clksrc = au_readl(SYS_CLKSRC);
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sys_clksrc &= ~0x00007FE0;
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au_writel(sys_clksrc, SYS_CLKSRC);
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sys_freqctrl = au_readl(SYS_FREQCTRL0);
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sys_freqctrl &= ~0xFFF00000;
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sys_clksrc = au_readl(SYS_CLKSRC);
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sys_clksrc &= ~0x00007FE0;
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// FREQ2 = aux/2 = 48 MHz
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sys_freqctrl |= ((0<<22) | (1<<21) | (1<<20));
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au_writel(sys_freqctrl, SYS_FREQCTRL0);
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/*
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* Route 48MHz FREQ2 into USB Host and/or Device
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*/
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#ifdef CONFIG_USB_OHCI
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sys_clksrc |= ((4<<12) | (0<<11) | (0<<10));
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#endif
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#ifdef CONFIG_AU1X00_USB_DEVICE
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sys_clksrc |= ((4<<7) | (0<<6) | (0<<5));
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#endif
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au_writel(sys_clksrc, SYS_CLKSRC);
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pin_func = au_readl(SYS_PINFUNC) & (u32)(~0x8000);
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#ifndef CONFIG_AU1X00_USB_DEVICE
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// 2nd USB port is USB host
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pin_func |= 0x8000;
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#endif
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au_writel(pin_func, SYS_PINFUNC);
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#endif // defined (CONFIG_USB_OHCI) || defined (CONFIG_AU1X00_USB_DEVICE)
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/* Configure GPIO2....it's used by PCI among other things.
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*/
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/* Make everything but GP200 (PCI RST) an input until we get
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* the pins set correctly.
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*/
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au_writel(0x00000001, GPIO2_DIR);
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/* Set the pins used for output.
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* A zero bit will leave PCI reset, LEDs off, power up USB,
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* IDSEL disabled.
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*/
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pin_val = ((3 << 30) | (7 << 19) | (1 << 17) | (1 << 16));
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au_writel(pin_val, GPIO2_OUTPUT);
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/* Set the output direction.
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*/
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pin_val = ((3 << 14) | (7 << 3) | (1 << 1) | (1 << 0));
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au_writel(pin_val, GPIO2_DIR);
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#ifdef CONFIG_PCI
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/* Use FREQ1 for the PCI output clock. We use the
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* CPU clock of 384 MHz divided by 12 to get 32 MHz PCI.
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* If Michael changes the CPU speed, we need to adjust
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* that here as well :-).
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*/
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/* zero and disable FREQ1
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*/
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sys_freqctrl = au_readl(SYS_FREQCTRL0);
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sys_freqctrl &= ~0x000ffc00;
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au_writel(sys_freqctrl, SYS_FREQCTRL0);
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/* zero and disable PCI clock
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*/
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sys_clksrc = au_readl(SYS_CLKSRC);
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sys_clksrc &= ~0x000f8000;
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au_writel(sys_clksrc, SYS_CLKSRC);
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/* Get current values (which really should match above).
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*/
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sys_freqctrl = au_readl(SYS_FREQCTRL0);
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sys_freqctrl &= ~0x000ffc00;
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sys_clksrc = au_readl(SYS_CLKSRC);
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sys_clksrc &= ~0x000f8000;
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/* FREQ1 = cpu/12 = 32 MHz
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*/
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sys_freqctrl |= ((5<<12) | (1<<11) | (0<<10));
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au_writel(sys_freqctrl, SYS_FREQCTRL0);
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/* Just connect the clock without further dividing.
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*/
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sys_clksrc |= ((3<<17) | (0<<16) | (0<<15));
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au_writel(sys_clksrc, SYS_CLKSRC);
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udelay(1);
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/* Now that clocks should be running, take PCI out of reset.
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*/
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pin_val = au_readl(GPIO2_OUTPUT);
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pin_val |= ((1 << 16) | 1);
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au_writel(pin_val, GPIO2_OUTPUT);
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// Setup PCI bus controller
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au_writel(0, Au1500_PCI_CMEM);
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au_writel(0x00003fff, Au1500_CFG_BASE);
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/* We run big endian without any of the software byte swapping,
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* so configure the PCI bridge to help us out.
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*/
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au_writel(0xf | (2<<6) | (1<<5) | (1<<4), Au1500_PCI_CFG);
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au_writel(0xf0000000, Au1500_PCI_MWMASK_DEV);
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au_writel(0, Au1500_PCI_MWBASE_REV_CCL);
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au_writel(0x02a00356, Au1500_PCI_STATCMD);
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au_writel(0x00003c04, Au1500_PCI_HDRTYPE);
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au_writel(0x00000008, Au1500_PCI_MBAR);
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au_sync();
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board_pci_idsel = csb250_pci_idsel;
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#endif
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/* Enable sys bus clock divider when IDLE state or no bus activity. */
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au_writel(au_readl(SYS_POWERCTRL) | (0x3 << 5), SYS_POWERCTRL);
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#ifdef CONFIG_RTC
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// Enable the RTC if not already enabled
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if (!(au_readl(0xac000028) & 0x20)) {
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printk("enabling clock ...\n");
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au_writel((au_readl(0xac000028) | 0x20), 0xac000028);
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}
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// Put the clock in BCD mode
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if (readl(0xac00002C) & 0x4) { /* reg B */
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au_writel(au_readl(0xac00002c) & ~0x4, 0xac00002c);
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au_sync();
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}
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#endif
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}
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/* The IDSEL is selected in the GPIO2 register. We will make device
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* 12 appear in slot 0 and device 13 appear in slot 1.
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*/
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int
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csb250_pci_idsel(unsigned int devsel, int assert)
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{
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int retval;
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unsigned int gpio2_pins;
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retval = 1;
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/* First, disable both selects, then assert the one requested.
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*/
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au_writel(0xc000c000, GPIO2_OUTPUT);
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au_sync();
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if (assert) {
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if (devsel == 12)
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gpio2_pins = 0x40000000;
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else if (devsel == 13)
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gpio2_pins = 0x80000000;
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else {
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gpio2_pins = 0xc000c000;
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retval = 0;
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}
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au_writel(gpio2_pins, GPIO2_OUTPUT);
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}
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au_sync();
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return retval;
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}
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