diff options
Diffstat (limited to 'arch/mips/au1000/csb250/board_setup.c')
| -rw-r--r-- | arch/mips/au1000/csb250/board_setup.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/arch/mips/au1000/csb250/board_setup.c b/arch/mips/au1000/csb250/board_setup.c new file mode 100644 index 0000000..90426ea --- /dev/null +++ b/arch/mips/au1000/csb250/board_setup.c @@ -0,0 +1,239 @@ +/* + * + * 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; +} |
