[Qemu-devel] [PATCH 08/12] onenand: Handle various ID fields separately

[Peter Maydell]

From: Juha Riihimäki <address@hidden>

Handle the manufacturer, device and version IDs separately rather than
smooshing them all together into a single uint32_t. Note that the ID
registers are actually 16 bit, even though typically the top bits are 0
and the Read Identification Data command only returns the bottom 8 bits.

Signed-off-by: Juha Riihimäki <address@hidden>
[Riku Voipio: Fixes and restructuring patchset]
Signed-off-by: Riku Voipio <address@hidden>
[Peter Maydell: More fixes and cleanups for upstream submission]
Signed-off-by:  Peter Maydell <address@hidden>
---
 hw/flash.h   |    3 ++-
 hw/nseries.c |    5 +++--
 hw/onenand.c |   29 ++++++++++++++++++-----------
 3 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/hw/flash.h b/hw/flash.h
index 1aae43d..1064fd0 100644
--- a/hw/flash.h
+++ b/hw/flash.h
@@ -38,7 +38,8 @@ uint32_t nand_getbuswidth(DeviceState *dev);
 /* onenand.c */
 void onenand_base_update(void *opaque, target_phys_addr_t new);
 void onenand_base_unmap(void *opaque);
-void *onenand_init(BlockDriverState *bdrv, uint32_t id,
+void *onenand_init(BlockDriverState *bdrv,
+                   uint16_t man_id, uint16_t dev_id, uint16_t ver_id,
                    int regshift, qemu_irq irq);
 void *onenand_raw_otp(void *opaque);
 
diff --git a/hw/nseries.c b/hw/nseries.c
index 4fef05d..9b8d338 100644
--- a/hw/nseries.c
+++ b/hw/nseries.c
@@ -167,8 +167,9 @@ static void n8x0_nand_setup(struct n800_s *s)
     DriveInfo *dinfo;
 
     dinfo = drive_get(IF_MTD, 0, 0);
-    /* Either ec40xx or ec48xx are OK for the ID */
-    s->nand = onenand_init(dinfo ? dinfo->bdrv : 0, 0xec4800, 1,
+    /* Either 0x40 or 0x48 are OK for the device ID */
+    s->nand = onenand_init(dinfo ? dinfo->bdrv : 0,
+                           NAND_MFR_SAMSUNG, 0x48, 0, 1,
                            qdev_get_gpio_in(s->cpu->gpio, N8X0_ONENAND_GPIO));
     omap_gpmc_attach(s->cpu->gpmc, N8X0_ONENAND_CS, 0, onenand_base_update,
                      onenand_base_unmap, s->nand);
diff --git a/hw/onenand.c b/hw/onenand.c
index 3a19d7f..9f02736 100644
--- a/hw/onenand.c
+++ b/hw/onenand.c
@@ -31,7 +31,11 @@
 #define BLOCK_SHIFT    (PAGE_SHIFT + 6)
 
 typedef struct {
-    uint32_t id;
+    struct {
+        uint16_t man;
+        uint16_t dev;
+        uint16_t ver;
+    } id;
     int shift;
     target_phys_addr_t base;
     qemu_irq intr;
@@ -453,12 +457,12 @@ static uint32_t onenand_read(void *opaque, 
target_phys_addr_t addr)
         return lduw_le_p(s->boot[0] + addr);
 
     case 0xf000:       /* Manufacturer ID */
-        return (s->id >> 16) & 0xff;
+        return s->id.man;
     case 0xf001:       /* Device ID */
-        return (s->id >>  8) & 0xff;
-    /* TODO: get the following values from a real chip!  */
+        return s->id.dev;
     case 0xf002:       /* Version ID */
-        return (s->id >>  0) & 0xff;
+        return s->id.ver;
+    /* TODO: get the following values from a real chip!  */
     case 0xf003:       /* Data Buffer size */
         return 1 << PAGE_SHIFT;
     case 0xf004:       /* Boot Buffer size */
@@ -541,8 +545,8 @@ static void onenand_write(void *opaque, target_phys_addr_t 
addr,
 
         case 0x0090:   /* Read Identification Data */
             memset(s->boot[0], 0, 3 << s->shift);
-            s->boot[0][0 << s->shift] = (s->id >> 16) & 0xff;
-            s->boot[0][1 << s->shift] = (s->id >>  8) & 0xff;
+            s->boot[0][0 << s->shift] = s->id.man & 0xff;
+            s->boot[0][1 << s->shift] = s->id.dev & 0xff;
             s->boot[0][2 << s->shift] = s->wpstatus & 0xff;
             break;
 
@@ -615,21 +619,24 @@ static CPUWriteMemoryFunc * const onenand_writefn[] = {
     onenand_write,
 };
 
-void *onenand_init(BlockDriverState *bdrv, uint32_t id,
+void *onenand_init(BlockDriverState *bdrv,
+                   uint16_t man_id, uint16_t dev_id, uint16_t ver_id,
                    int regshift, qemu_irq irq)
 {
     OneNANDState *s = (OneNANDState *) qemu_mallocz(sizeof(*s));
-    uint32_t size = 1 << (24 + ((id >> 12) & 7));
+    uint32_t size = 1 << (24 + ((dev_id >> 4) & 7));
     void *ram;
 
     s->shift = regshift;
     s->intr = irq;
     s->rdy = NULL;
-    s->id = id;
+    s->id.man = man_id;
+    s->id.dev = dev_id;
+    s->id.ver = ver_id;
     s->blocks = size >> BLOCK_SHIFT;
     s->secs = size >> 9;
     s->blockwp = qemu_malloc(s->blocks);
-    s->density_mask = (id & (1 << 11)) ? (1 << (6 + ((id >> 12) & 7))) : 0;
+    s->density_mask = (dev_id & 0x08) ? (1 << (6 + ((dev_id >> 4) & 7))) : 0;
     s->iomemtype = cpu_register_io_memory(onenand_readfn,
                     onenand_writefn, s, DEVICE_NATIVE_ENDIAN);
     s->bdrv = bdrv;
-- 
1.7.1