Re: [PATCH -mm 2/4] MIPS: BCM947xx support

[Michael Buesch <mb@bu3sch.de>]

On Monday 06 August 2007, Aurelien Jarno wrote:
> The patch below against 2.6.23-rc1-mm2 adds support for BCM947xx CPUs.
> It originally comes from the OpenWrt patches.
> 
> Cc: Michael Buesch <mb@bu3sch.de>
> Cc: Waldemar Brodkorb <wbx@openwrt.org>
> Cc: Felix Fietkau <nbd@openwrt.org>
> Cc: Florian Schirmer <jolt@tuxbox.org>
> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
> 
> --- a/arch/mips/bcm947xx/irq.c
> +++ b/arch/mips/bcm947xx/irq.c
> @@ -0,0 +1,63 @@
> +/*
> + *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
> + *
> + *  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/errno.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/smp.h>
> +#include <linux/types.h>
> +
> +#include <asm/cpu.h>
> +#include <asm/io.h>
> +#include <asm/irq.h>
> +#include <asm/irq_cpu.h>
> +
> +void plat_irq_dispatch(void)
> +{
> +	u32 cause;
> +
> +	cause = read_c0_cause() & read_c0_status() & CAUSEF_IP;
> +
> +	clear_c0_status(cause);
> +
> +	if (cause & CAUSEF_IP7)
> +		do_IRQ(7);
> +	if (cause & CAUSEF_IP2)
> +		do_IRQ(2);
> +	if (cause & CAUSEF_IP3)
> +		do_IRQ(3);
> +	if (cause & CAUSEF_IP4)
> +		do_IRQ(4);
> +	if (cause & CAUSEF_IP5)
> +		do_IRQ(5);
> +	if (cause & CAUSEF_IP6)
> +		do_IRQ(6);
> +}
> +
> +void __init arch_init_irq(void)
> +{
> +	mips_cpu_irq_init();
> +}
> --- a/arch/mips/bcm947xx/prom.c
> +++ b/arch/mips/bcm947xx/prom.c
> @@ -0,0 +1,58 @@
> +/*
> + *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
> + *
> + *  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/init.h>
> +#include <linux/mm.h>
> +#include <linux/sched.h>
> +#include <linux/bootmem.h>
> +
> +#include <asm/addrspace.h>
> +#include <asm/bootinfo.h>
> +#include <asm/pmon.h>
> +
> +const char *get_system_type(void)
> +{
> +	return "Broadcom BCM947xx";
> +}
> +
> +void __init prom_init(void)
> +{
> +	unsigned long mem;
> +
> +	mips_machgroup = MACH_GROUP_BRCM;
> +	mips_machtype = MACH_BCM947XX;
> +
> +	/* Figure out memory size by finding aliases */
> +	for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) {
> +		if (*(unsigned long *)((unsigned long)(prom_init) + mem) == 
> +		    *(unsigned long *)(prom_init))
> +			break;
> +	}
> +
> +	add_memory_region(0, mem, BOOT_MEM_RAM);
> +}
> +
> +void __init prom_free_prom_memory(void)
> +{
> +}
> --- a/arch/mips/bcm947xx/setup.c	
> +++ b/arch/mips/bcm947xx/setup.c
> @@ -0,0 +1,106 @@
> +/*
> + *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
> + *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
> + *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
> + *  Copyright (C) 2006 Michael Buesch <mb@bu3sch.de>
> + *
> + *  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/init.h>
> +#include <linux/types.h>
> +#include <linux/tty.h>
> +#include <linux/serial.h>
> +#include <linux/serial_core.h>
> +#include <linux/serial_reg.h>
> +#include <linux/serial_8250.h>
> +#include <asm/bootinfo.h>
> +#include <asm/time.h>
> +#include <asm/reboot.h>
> +#include <linux/pm.h>
> +#include <linux/ssb/ssb.h>
> +
> +extern void bcm947xx_pci_init(void);
> +extern void bcm947xx_time_init(void);
> +
> +struct ssb_bus ssb;
> +
> +static void bcm947xx_machine_restart(char *command)
> +{
> +	printk(KERN_ALERT "Please stand by while rebooting the system...\n");
> +	local_irq_disable();
> +	/* Set the watchdog timer to reset immediately */
> +	ssb_chipco_watchdog_timer_set(&ssb.chipco, 1);
> +	while (1)
> +		cpu_relax();
> +}
> +
> +static void bcm947xx_machine_halt(void)
> +{
> +	/* Disable interrupts and watchdog and spin forever */
> +	local_irq_disable();
> +	ssb_chipco_watchdog_timer_set(&ssb.chipco, 0);
> +	while (1)
> +		cpu_relax();
> +}
> +
> +static int bcm947xx_get_invariants(struct ssb_bus *bus, struct ssb_init_invariants *iv)
> +{

No reading of NVRAM, yet?

> +	return 0;
> +}
> +
> +void __init plat_mem_setup(void)
> +{
> +	int i, err;
> +	struct ssb_mipscore *mcore;
> +
> +	err = ssb_bus_ssbbus_register(&ssb, SSB_ENUM_BASE, bcm947xx_get_invariants);
> +	if (err) {
> +		const char *msg = "Failed to initialize SSB bus (err %d)\n";
> +		panic(msg, err);

We don't need the msg variable anymore.

> +	}
> +	mcore = &ssb.mipscore;
> +
> +#ifdef CONFIG_SERIAL_8250
> +	for (i = 0; i < mcore->nr_serial_ports; i++) {
> +		struct ssb_serial_port *port = &(mcore->serial_ports[i]);
> +		struct uart_port s;
> +	
> +		memset(&s, 0, sizeof(s));
> +		s.line = i;
> +		s.membase = port->regs;
> +		s.irq = port->irq + 2;
> +		s.uartclk = port->baud_base;
> +		s.flags = UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
> +		s.iotype = SERIAL_IO_MEM;
> +		s.regshift = port->reg_shift;
> +
> +		early_serial_setup(&s);
> +	}
> +#endif
> +
> +	_machine_restart = bcm947xx_machine_restart;
> +	_machine_halt = bcm947xx_machine_halt;
> +	pm_power_off = bcm947xx_machine_halt;
> +	board_time_init = bcm947xx_time_init;
> +}
> +
> +EXPORT_SYMBOL(ssb);
> --- a/arch/mips/bcm947xx/time.c
> +++ b/arch/mips/bcm947xx/time.c
> @@ -0,0 +1,62 @@
> +/*
> + *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
> + *
> + *  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/init.h>
> +#include <linux/kernel.h>
> +#include <linux/sched.h>
> +#include <linux/serial_reg.h>
> +#include <linux/interrupt.h>
> +#include <linux/ssb/ssb.h>
> +#include <asm/addrspace.h>
> +#include <asm/io.h>
> +#include <asm/time.h>
> +
> +extern struct ssb_bus ssb;
> +
> +void __init
> +bcm947xx_time_init(void)
> +{
> +	unsigned long hz;
> +
> +	/*
> +	 * Use deterministic values for initial counter interrupt
> +	 * so that calibrate delay avoids encountering a counter wrap.
> +	 */
> +	write_c0_count(0);
> +	write_c0_compare(0xffff);
> +
> +	hz = ssb_cpu_clock(&ssb.mipscore) / 2;
> +	if (!hz)
> +		hz = 100000000;
> +
> +	/* Set MIPS counter frequency for fixed_rate_gettimeoffset() */
> +	mips_hpt_frequency = hz;
> +}
> +
> +void __init
> +plat_timer_setup(struct irqaction *irq)
> +{
> +	/* Enable the timer interrupt */
> +	setup_irq(7, irq);
> +}
> --- a/arch/mips/bcm947xx/Makefile
> +++ b/arch/mips/bcm947xx/Makefile
> @@ -0,0 +1,6 @@
> +#
> +# Makefile for the BCM947xx specific kernel interface routines
> +# under Linux.
> +#
> +
> +obj-y := irq.o prom.o setup.o time.o
> 

The patch, except the tiny comments above is
Acked-by: Michael Buesch <mb@bu3sch.de>