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-rw-r--r--arch/mips/bcm47xx/prom.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/prom.c b/arch/mips/bcm47xx/prom.c
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+++ b/arch/mips/bcm47xx/prom.c
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+/*
+ * 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)
+{
+}
+