xtensa_lx60: add FLASH support

LX60 carry 4 Mbyte FLASH and 128 Kbyte SRAM, LX200 carry 16 Mbyte FLASH
and 32 Mbyte SRAM. Either of these memories may be mapped to the system
ROM region.

Select boot from FLASH if -kernel option is not specified, otherwise
boot from SRAM.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

default-configs/xtensa-softmmu.mak

@@ -2,3 +2,4 @@
 
 CONFIG_SERIAL=y
 CONFIG_OPENCORES_ETH=y
+CONFIG_PFLASH_CFI01=y

default-configs/xtensaeb-softmmu.mak

@@ -2,3 +2,4 @@
 
 CONFIG_SERIAL=y
 CONFIG_OPENCORES_ETH=y
+CONFIG_PFLASH_CFI01=y

hw/xtensa_lx60.c

@@ -33,6 +33,13 @@
 #include "exec-memory.h"
 #include "pc.h"
 #include "sysbus.h"
+#include "flash.h"
+
+typedef struct LxBoardDesc {
+    size_t flash_size;
+    size_t flash_sector_size;
+    size_t sram_size;
+} LxBoardDesc;
 
 typedef struct Lx60FpgaState {
     MemoryRegion iomem;
@@ -142,8 +149,8 @@ static void lx60_reset(void *env)
     cpu_reset(env);
 }
 
-static void lx60_init(ram_addr_t ram_size,
-        const char *boot_device,
+static void lx_init(const LxBoardDesc *board,
+        ram_addr_t ram_size, const char *boot_device,
         const char *kernel_filename, const char *kernel_cmdline,
         const char *initrd_filename, const char *cpu_model)
 {
@@ -155,8 +162,14 @@ static void lx60_init(ram_addr_t ram_size,
     MemoryRegion *system_memory = get_system_memory();
     CPUState *env = NULL;
     MemoryRegion *ram, *rom, *system_io;
+    DriveInfo *dinfo;
+    pflash_t *flash = NULL;
     int n;
 
+    if (!cpu_model) {
+        cpu_model = "dc232b";
+    }
+
     for (n = 0; n < smp_cpus; n++) {
         env = cpu_init(cpu_model);
         if (!env) {
@@ -195,6 +208,20 @@ static void lx60_init(ram_addr_t ram_size,
     serial_mm_init(system_io, 0x0d050020, 2, xtensa_get_extint(env, 0),
             115200, serial_hds[0], DEVICE_NATIVE_ENDIAN);
 
+    dinfo = drive_get(IF_PFLASH, 0, 0);
+    if (dinfo) {
+        flash = pflash_cfi01_register(0xf8000000,
+                NULL, "lx60.io.flash", board->flash_size,
+                dinfo->bdrv, board->flash_sector_size,
+                board->flash_size / board->flash_sector_size,
+                4, 0x0000, 0x0000, 0x0000, 0x0000, be);
+        if (flash == NULL) {
+            fprintf(stderr, "Unable to mount pflash\n");
+            exit(1);
+        }
+    }
+
+    /* Use presence of kernel file name as 'boot from SRAM' switch. */
     if (kernel_filename) {
         uint64_t elf_entry;
         uint64_t elf_lowaddr;
@@ -203,6 +230,16 @@ static void lx60_init(ram_addr_t ram_size,
         if (success > 0) {
             env->pc = elf_entry;
         }
+    } else {
+        if (flash) {
+            MemoryRegion *flash_mr = pflash_cfi01_get_memory(flash);
+            MemoryRegion *flash_io = g_malloc(sizeof(*flash_io));
+
+            memory_region_init_alias(flash_io, "lx60.flash",
+                    flash_mr, 0, board->flash_size);
+            memory_region_add_subregion(system_memory, 0xfe000000,
+                    flash_io);
+        }
     }
 }
 
@@ -211,10 +248,28 @@ static void xtensa_lx60_init(ram_addr_t ram_size,
                      const char *kernel_filename, const char *kernel_cmdline,
                      const char *initrd_filename, const char *cpu_model)
 {
-    if (!cpu_model) {
-        cpu_model = "dc232b";
-    }
-    lx60_init(ram_size, boot_device, kernel_filename, kernel_cmdline,
+    static const LxBoardDesc lx60_board = {
+        .flash_size = 0x400000,
+        .flash_sector_size = 0x10000,
+        .sram_size = 0x20000,
+    };
+    lx_init(&lx60_board, ram_size, boot_device,
+            kernel_filename, kernel_cmdline,
+            initrd_filename, cpu_model);
+}
+
+static void xtensa_lx200_init(ram_addr_t ram_size,
+                     const char *boot_device,
+                     const char *kernel_filename, const char *kernel_cmdline,
+                     const char *initrd_filename, const char *cpu_model)
+{
+    static const LxBoardDesc lx200_board = {
+        .flash_size = 0x1000000,
+        .flash_sector_size = 0x20000,
+        .sram_size = 0x2000000,
+    };
+    lx_init(&lx200_board, ram_size, boot_device,
+            kernel_filename, kernel_cmdline,
             initrd_filename, cpu_model);
 }
 
@@ -225,9 +280,17 @@ static QEMUMachine xtensa_lx60_machine = {
     .max_cpus = 4,
 };
 
-static void xtensa_lx60_machine_init(void)
+static QEMUMachine xtensa_lx200_machine = {
+    .name = "lx200",
+    .desc = "lx200 EVB (dc232b)",
+    .init = xtensa_lx200_init,
+    .max_cpus = 4,
+};
+
+static void xtensa_lx_machines_init(void)
 {
     qemu_register_machine(&xtensa_lx60_machine);
+    qemu_register_machine(&xtensa_lx200_machine);
 }
 
-machine_init(xtensa_lx60_machine_init);
+machine_init(xtensa_lx_machines_init);