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Diffstat (limited to 'arch/mips/bcm47xx/prom.c')
| -rw-r--r-- | arch/mips/bcm47xx/prom.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/prom.c b/arch/mips/bcm47xx/prom.c new file mode 100644 index 000000000000..079e33d52783 --- /dev/null +++ b/arch/mips/bcm47xx/prom.c @@ -0,0 +1,158 @@ +/* + * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> + * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net> + * + * 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/kernel.h> +#include <linux/spinlock.h> +#include <asm/bootinfo.h> +#include <asm/fw/cfe/cfe_api.h> +#include <asm/fw/cfe/cfe_error.h> + +static int cfe_cons_handle; + +const char *get_system_type(void) +{ + return "Broadcom BCM47XX"; +} + +void prom_putchar(char c) +{ + while (cfe_write(cfe_cons_handle, &c, 1) == 0) + ; +} + +static __init void prom_init_cfe(void) +{ + uint32_t cfe_ept; + uint32_t cfe_handle; + uint32_t cfe_eptseal; + int argc = fw_arg0; + char **envp = (char **) fw_arg2; + int *prom_vec = (int *) fw_arg3; + + /* + * Check if a loader was used; if NOT, the 4 arguments are + * what CFE gives us (handle, 0, EPT and EPTSEAL) + */ + if (argc < 0) { + cfe_handle = (uint32_t)argc; + cfe_ept = (uint32_t)envp; + cfe_eptseal = (uint32_t)prom_vec; + } else { + if ((int)prom_vec < 0) { + /* + * Old loader; all it gives us is the handle, + * so use the "known" entrypoint and assume + * the seal. + */ + cfe_handle = (uint32_t)prom_vec; + cfe_ept = 0xBFC00500; + cfe_eptseal = CFE_EPTSEAL; + } else { + /* + * Newer loaders bundle the handle/ept/eptseal + * Note: prom_vec is in the loader's useg + * which is still alive in the TLB. + */ + cfe_handle = prom_vec[0]; + cfe_ept = prom_vec[2]; + cfe_eptseal = prom_vec[3]; + } + } + + if (cfe_eptseal != CFE_EPTSEAL) { + /* too early for panic to do any good */ + printk(KERN_ERR "CFE's entrypoint seal doesn't match."); + while (1) ; + } + + cfe_init(cfe_handle, cfe_ept); +} + +static __init void prom_init_console(void) +{ + /* Initialize CFE console */ + cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE); +} + +static __init void prom_init_cmdline(void) +{ + char buf[CL_SIZE]; + + /* Get the kernel command line from CFE */ + if (cfe_getenv("LINUX_CMDLINE", buf, CL_SIZE) >= 0) { + buf[CL_SIZE-1] = 0; + strcpy(arcs_cmdline, buf); + } + + /* Force a console handover by adding a console= argument if needed, + * as CFE is not available anymore later in the boot process. */ + if ((strstr(arcs_cmdline, "console=")) == NULL) { + /* Try to read the default serial port used by CFE */ + if ((cfe_getenv("BOOT_CONSOLE", buf, CL_SIZE) < 0) + || (strncmp("uart", buf, 4))) + /* Default to uart0 */ + strcpy(buf, "uart0"); + + /* Compute the new command line */ + snprintf(arcs_cmdline, CL_SIZE, "%s console=ttyS%c,115200", + arcs_cmdline, buf[4]); + } +} + +static __init void prom_init_mem(void) +{ + unsigned long mem; + + /* Figure out memory size by finding aliases. + * + * We should theoretically use the mapping from CFE using cfe_enummem(). + * However as the BCM47XX is mostly used on low-memory systems, we + * want to reuse the memory used by CFE (around 4MB). That means cfe_* + * functions stop to work at some point during the boot, we should only + * call them at the beginning of the boot. + */ + 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_init(void) +{ + prom_init_cfe(); + prom_init_console(); + prom_init_cmdline(); + prom_init_mem(); +} + +void __init prom_free_prom_memory(void) +{ +} + |