lm32: add support for the Milkymist board

This patch adds almost complete support for the Milkymist system-on-chip
(http://www.milkymist.org).

Additional to running bare metal applications, booting a linux kernel with
initrd is supported.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

Makefile.target

@@ -260,6 +260,7 @@ obj-ppc-y += xilinx_ethlite.o
 
 # LM32 boards
 obj-lm32-y += lm32_boards.o
+obj-lm32-y += milkymist.o
 
 # LM32 peripherals
 obj-lm32-y += lm32_pic.o

default-configs/lm32-softmmu.mak

@@ -1,5 +1,6 @@
 # Default configuration for lm32-softmmu
 
 CONFIG_PTIMER=y
+CONFIG_PFLASH_CFI01=y
 CONFIG_PFLASH_CFI02=y
 CONFIG_SD=y

hw/milkymist.c

@@ -0,0 +1,216 @@
+/*
+ *  QEMU model for the Milkymist board.
+ *
+ *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "sysbus.h"
+#include "hw.h"
+#include "net.h"
+#include "flash.h"
+#include "sysemu.h"
+#include "devices.h"
+#include "boards.h"
+#include "loader.h"
+#include "elf.h"
+#include "blockdev.h"
+#include "milkymist-hw.h"
+#include "lm32.h"
+
+#define BIOS_FILENAME    "mmone-bios.bin"
+#define BIOS_OFFSET      0x00860000
+#define BIOS_SIZE        (512*1024)
+#define KERNEL_LOAD_ADDR 0x40000000
+
+typedef struct {
+    CPUState *env;
+    target_phys_addr_t bootstrap_pc;
+    target_phys_addr_t flash_base;
+    target_phys_addr_t initrd_base;
+    size_t initrd_size;
+    target_phys_addr_t cmdline_base;
+} ResetInfo;
+
+static void cpu_irq_handler(void *opaque, int irq, int level)
+{
+    CPUState *env = opaque;
+
+    if (level) {
+        cpu_interrupt(env, CPU_INTERRUPT_HARD);
+    } else {
+        cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
+    }
+}
+
+static void main_cpu_reset(void *opaque)
+{
+    ResetInfo *reset_info = opaque;
+    CPUState *env = reset_info->env;
+
+    cpu_reset(env);
+
+    /* init defaults */
+    env->pc = reset_info->bootstrap_pc;
+    env->regs[R_R1] = reset_info->cmdline_base;
+    env->regs[R_R2] = reset_info->initrd_base;
+    env->regs[R_R3] = reset_info->initrd_base + reset_info->initrd_size;
+    env->eba = reset_info->flash_base;
+    env->deba = reset_info->flash_base;
+}
+
+static void
+milkymist_init(ram_addr_t ram_size_not_used,
+                          const char *boot_device,
+                          const char *kernel_filename,
+                          const char *kernel_cmdline,
+                          const char *initrd_filename, const char *cpu_model)
+{
+    CPUState *env;
+    int kernel_size;
+    DriveInfo *dinfo;
+    ram_addr_t phys_sdram;
+    ram_addr_t phys_flash;
+    qemu_irq irq[32], *cpu_irq;
+    int i;
+    char *bios_filename;
+    ResetInfo *reset_info;
+
+    /* memory map */
+    target_phys_addr_t flash_base   = 0x00000000;
+    size_t flash_sector_size        = 128 * 1024;
+    size_t flash_size               = 32 * 1024 * 1024;
+    target_phys_addr_t sdram_base   = 0x40000000;
+    size_t sdram_size               = 128 * 1024 * 1024;
+
+    target_phys_addr_t initrd_base  = sdram_base + 0x1002000;
+    target_phys_addr_t cmdline_base = sdram_base + 0x1000000;
+    size_t initrd_max = sdram_size - 0x1002000;
+
+    reset_info = qemu_mallocz(sizeof(ResetInfo));
+
+    if (cpu_model == NULL) {
+        cpu_model = "lm32-full";
+    }
+    env = cpu_init(cpu_model);
+    reset_info->env = env;
+
+    cpu_lm32_set_phys_msb_ignore(env, 1);
+
+    phys_sdram = qemu_ram_alloc(NULL, "milkymist.sdram", sdram_size);
+    cpu_register_physical_memory(sdram_base, sdram_size,
+            phys_sdram | IO_MEM_RAM);
+
+    phys_flash = qemu_ram_alloc(NULL, "milkymist.flash", flash_size);
+    dinfo = drive_get(IF_PFLASH, 0, 0);
+    /* Numonyx JS28F256J3F105 */
+    pflash_cfi01_register(flash_base, phys_flash,
+                          dinfo ? dinfo->bdrv : NULL, flash_sector_size,
+                          flash_size / flash_sector_size, 2,
+                          0x00, 0x89, 0x00, 0x1d, 1);
+
+    /* create irq lines */
+    cpu_irq = qemu_allocate_irqs(cpu_irq_handler, env, 1);
+    env->pic_state = lm32_pic_init(*cpu_irq);
+    for (i = 0; i < 32; i++) {
+        irq[i] = qdev_get_gpio_in(env->pic_state, i);
+    }
+
+    /* load bios rom */
+    if (bios_name == NULL) {
+        bios_name = BIOS_FILENAME;
+    }
+    bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+
+    if (bios_filename) {
+        load_image_targphys(bios_filename, BIOS_OFFSET, BIOS_SIZE);
+    }
+
+    reset_info->bootstrap_pc = BIOS_OFFSET;
+
+    /* if no kernel is given no valid bios rom is a fatal error */
+    if (!kernel_filename && !dinfo && !bios_filename) {
+        fprintf(stderr, "qemu: could not load Milkymist One bios '%s'\n",
+                bios_name);
+        exit(1);
+    }
+
+    milkymist_uart_create(0x60000000, irq[0], irq[1]);
+    milkymist_sysctl_create(0x60001000, irq[2], irq[3], irq[4],
+            80000000, 0x10014d31, 0x0000041f, 0x00000001);
+    milkymist_hpdmc_create(0x60002000);
+    milkymist_vgafb_create(0x60003000, 0x40000000, 0x0fffffff);
+    milkymist_memcard_create(0x60004000);
+    milkymist_ac97_create(0x60005000, irq[5], irq[6], irq[7], irq[8]);
+    milkymist_pfpu_create(0x60006000, irq[9]);
+    milkymist_tmu2_create(0x60007000, irq[10]);
+    milkymist_minimac_create(0x60008000, irq[11], irq[12]);
+    milkymist_softusb_create(0x6000f000, irq[17],
+            0x20000000, 0x1000, 0x20020000, 0x2000);
+
+    /* make sure juart isn't the first chardev */
+    env->juart_state = lm32_juart_init();
+
+    if (kernel_filename) {
+        uint64_t entry;
+
+        /* Boots a kernel elf binary.  */
+        kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
+                               1, ELF_MACHINE, 0);
+        reset_info->bootstrap_pc = entry;
+
+        if (kernel_size < 0) {
+            kernel_size = load_image_targphys(kernel_filename, sdram_base,
+                                              sdram_size);
+            reset_info->bootstrap_pc = sdram_base;
+        }
+
+        if (kernel_size < 0) {
+            fprintf(stderr, "qemu: could not load kernel '%s'\n",
+                    kernel_filename);
+            exit(1);
+        }
+    }
+
+    if (kernel_cmdline && strlen(kernel_cmdline)) {
+        pstrcpy_targphys("cmdline", cmdline_base, TARGET_PAGE_SIZE,
+                kernel_cmdline);
+        reset_info->cmdline_base = (uint32_t)cmdline_base;
+    }
+
+    if (initrd_filename) {
+        size_t initrd_size;
+        initrd_size = load_image_targphys(initrd_filename, initrd_base,
+                initrd_max);
+        reset_info->initrd_base = (uint32_t)initrd_base;
+        reset_info->initrd_size = (uint32_t)initrd_size;
+    }
+
+    qemu_register_reset(main_cpu_reset, reset_info);
+}
+
+static QEMUMachine milkymist_machine = {
+    .name = "milkymist",
+    .desc = "Milkymist One",
+    .init = milkymist_init,
+    .is_default = 0
+};
+
+static void milkymist_machine_init(void)
+{
+    qemu_register_machine(&milkymist_machine);
+}
+
+machine_init(milkymist_machine_init);