159 lines
4.5 KiB
C
159 lines
4.5 KiB
C
/*
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* Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
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* Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
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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/init.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <asm/bootinfo.h>
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#include <asm/fw/cfe/cfe_api.h>
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#include <asm/fw/cfe/cfe_error.h>
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static int cfe_cons_handle;
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const char *get_system_type(void)
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{
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return "Broadcom BCM47XX";
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}
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void prom_putchar(char c)
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{
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while (cfe_write(cfe_cons_handle, &c, 1) == 0)
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;
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}
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static __init void prom_init_cfe(void)
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{
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uint32_t cfe_ept;
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uint32_t cfe_handle;
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uint32_t cfe_eptseal;
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int argc = fw_arg0;
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char **envp = (char **) fw_arg2;
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int *prom_vec = (int *) fw_arg3;
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/*
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* Check if a loader was used; if NOT, the 4 arguments are
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* what CFE gives us (handle, 0, EPT and EPTSEAL)
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*/
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if (argc < 0) {
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cfe_handle = (uint32_t)argc;
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cfe_ept = (uint32_t)envp;
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cfe_eptseal = (uint32_t)prom_vec;
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} else {
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if ((int)prom_vec < 0) {
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/*
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* Old loader; all it gives us is the handle,
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* so use the "known" entrypoint and assume
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* the seal.
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*/
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cfe_handle = (uint32_t)prom_vec;
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cfe_ept = 0xBFC00500;
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cfe_eptseal = CFE_EPTSEAL;
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} else {
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/*
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* Newer loaders bundle the handle/ept/eptseal
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* Note: prom_vec is in the loader's useg
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* which is still alive in the TLB.
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*/
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cfe_handle = prom_vec[0];
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cfe_ept = prom_vec[2];
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cfe_eptseal = prom_vec[3];
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}
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}
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if (cfe_eptseal != CFE_EPTSEAL) {
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/* too early for panic to do any good */
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printk(KERN_ERR "CFE's entrypoint seal doesn't match.");
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while (1) ;
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}
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cfe_init(cfe_handle, cfe_ept);
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}
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static __init void prom_init_console(void)
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{
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/* Initialize CFE console */
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cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
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}
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static __init void prom_init_cmdline(void)
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{
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static char buf[CL_SIZE] __initdata;
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/* Get the kernel command line from CFE */
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if (cfe_getenv("LINUX_CMDLINE", buf, CL_SIZE) >= 0) {
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buf[CL_SIZE-1] = 0;
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strcpy(arcs_cmdline, buf);
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}
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/* Force a console handover by adding a console= argument if needed,
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* as CFE is not available anymore later in the boot process. */
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if ((strstr(arcs_cmdline, "console=")) == NULL) {
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/* Try to read the default serial port used by CFE */
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if ((cfe_getenv("BOOT_CONSOLE", buf, CL_SIZE) < 0)
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|| (strncmp("uart", buf, 4)))
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/* Default to uart0 */
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strcpy(buf, "uart0");
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/* Compute the new command line */
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snprintf(arcs_cmdline, CL_SIZE, "%s console=ttyS%c,115200",
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arcs_cmdline, buf[4]);
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}
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}
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static __init void prom_init_mem(void)
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{
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unsigned long mem;
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/* Figure out memory size by finding aliases.
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*
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* We should theoretically use the mapping from CFE using cfe_enummem().
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* However as the BCM47XX is mostly used on low-memory systems, we
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* want to reuse the memory used by CFE (around 4MB). That means cfe_*
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* functions stop to work at some point during the boot, we should only
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* call them at the beginning of the boot.
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*/
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for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) {
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if (*(unsigned long *)((unsigned long)(prom_init) + mem) ==
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*(unsigned long *)(prom_init))
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break;
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}
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add_memory_region(0, mem, BOOT_MEM_RAM);
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}
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void __init prom_init(void)
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{
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prom_init_cfe();
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prom_init_console();
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prom_init_cmdline();
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prom_init_mem();
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}
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void __init prom_free_prom_memory(void)
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{
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}
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