[Qemu-devel] [PATCH 12/16] S3C NAND controller

[Vincent Sanders <vince@kyllikki.org>]

S3C NAND Driver

Signed-off-by: Vincent Sanders <vince@simtec.co.uk>
---
 s3c24xx_nand.c |  136 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)


diff -urN qemusvnclean/hw/s3c24xx_nand.c qemusvnpatches/hw/s3c24xx_nand.c
--- qemusvnclean/hw/s3c24xx_nand.c	1970-01-01 01:00:00.000000000 +0100
+++ qemusvnpatches/hw/s3c24xx_nand.c	2009-04-23 17:13:06.000000000 +0100
@@ -0,0 +1,136 @@
+/* hw/s3c24xx_nand.c
+ *
+ * Samsung S3C24XX NAND emulation
+ *
+ * Copyright 2006, 2008 Ben Dooks, Daniel Silverstone and Vincent Sanders
+ *
+ * This file is under the terms of the GNU General Public
+ * License Version 2
+ */
+
+#include "hw.h"
+#include "flash.h"
+
+#include "s3c24xx.h"
+
+#define NFCONF 0
+#define NFCMD 1
+#define NFADDR 2
+#define NFDATA 3
+#define NFSTAT 4
+#define NFECC 5
+
+#define NFCE ((soc->nand_reg[NFCONF] & 1<<11) != 0)
+
+static void
+s3c24xx_nand_write_f(void *opaque, target_phys_addr_t addr,
+                     uint32_t value)
+{
+    S3CState *soc = (S3CState *)opaque;
+    int reg = (addr & 0x1f) >> 2;
+
+    if ((reg != NFCONF) && ((soc->nand_reg[NFCONF] & 1<<15) == 0)) {
+        return; /* Ignore the write, the nand is not enabled */
+    }
+
+    switch (reg) {
+    case NFCONF:
+        soc->nand_reg[reg] = value;
+        if (soc->nand_chip != NULL)
+            nand_setpins(soc->nand_chip, 0, 0, NFCE, 1, 0);
+        break;
+
+    case NFCMD:
+        soc->nand_reg[reg] = value;
+        if (soc->nand_chip != NULL) {
+            nand_setpins(soc->nand_chip, 1, 0, NFCE, 1, 0);
+            nand_setio(soc->nand_chip, value);
+        }
+        break;
+
+    case NFADDR:
+        soc->nand_reg[reg] = value;
+        if (soc->nand_chip != NULL) {
+            nand_setpins(soc->nand_chip, 0, 1, NFCE, 1, 0);
+            nand_setio(soc->nand_chip, value);
+        }
+        break;
+
+    case NFDATA:
+        soc->nand_reg[reg] = value;
+        if (soc->nand_chip != NULL) {
+            nand_setpins(soc->nand_chip, 0, 0, NFCE, 1, 0);
+            nand_setio(soc->nand_chip, value);
+        }
+        break;
+
+    default:
+        /* Do nothing because the other registers are read only */
+        break;
+    }
+}
+
+static uint32_t
+s3c24xx_nand_read_f(void *opaque, target_phys_addr_t addr)
+{
+    S3CState *soc = (S3CState *)opaque;
+    int reg = (addr & 0x1f) >> 2;
+    uint32_t ret = soc->nand_reg[reg];
+
+    switch (reg) {
+    case NFDATA:
+        if (soc->nand_chip != NULL) {
+            nand_setpins(soc->nand_chip, 0, 0, NFCE, 1, 0);
+            ret = soc->nand_reg[reg] = nand_getio(soc->nand_chip);
+        } else {
+            ret = soc->nand_reg[ret] = 0;
+        }
+        break;
+
+    case NFSTAT:
+        if (soc->nand_chip != NULL) {
+            nand_getpins(soc->nand_chip, (int *)&ret);
+            soc->nand_reg[reg] = ret;
+        } else {
+            ret = soc->nand_reg[ret] = 0;
+        }
+
+    default:
+        /* The rest read-back what was written to them */
+        break;
+    }
+
+    return ret;
+}
+
+static CPUReadMemoryFunc *s3c24xx_nand_read[] = {
+    &s3c24xx_nand_read_f,
+    &s3c24xx_nand_read_f,
+    &s3c24xx_nand_read_f,
+};
+
+static CPUWriteMemoryFunc *s3c24xx_nand_write[] = {
+    &s3c24xx_nand_write_f,
+    &s3c24xx_nand_write_f,
+    &s3c24xx_nand_write_f,
+};
+
+void
+s3c24xx_nand_init(S3CState *soc, target_phys_addr_t base_addr)
+{
+    int tag = cpu_register_io_memory(0, s3c24xx_nand_read, s3c24xx_nand_write, soc);
+    cpu_register_physical_memory(base_addr, 0x40, tag);
+
+    memset(soc->nand_reg, 0, sizeof(uint32_t) * 5);
+}
+
+void
+s3c24xx_nand_attach(S3CState *soc, struct nand_flash_s *nand_chip)
+{
+    if (soc->nand_chip != NULL) {
+        /* Detach current nand device */
+        /* no cmd, no addr, not enabled, write protected, no 'gnd' */
+        nand_setpins(soc->nand_chip, 0, 0, 1, 0, 0); 
+    }
+    soc->nand_chip = nand_chip;
+}

-- 
Regards Vincent
http://www.kyllikki.org/