From 9f8e76bf22482e67cceddd35580c84d66877af5d Mon Sep 17 00:00:00 2001
From: Michael Sparmann <theseven@rockbox.org>
Date: Fri, 12 Mar 2010 20:44:03 +0000
Subject: Hopefully fix the latest Nano2G NAND issues. (FS#11092) Transfers for
 some of the chips apple is using will be slow until someone implements cached
 writes.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25137 a1c6a512-1295-4272-9138-f99709370657
---
 .../target/arm/s5l8700/ipodnano2g/nand-nano2g.c    | 83 +++++++---------------
 1 file changed, 27 insertions(+), 56 deletions(-)

(limited to 'firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c')

diff --git a/firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c b/firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c
index 26c53edc79..687a3179f9 100644
--- a/firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c
+++ b/firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c
@@ -89,6 +89,7 @@ uint8_t nand_tunk2[4];
 uint8_t nand_tunk3[4];
 uint32_t nand_type[4];
 int nand_powered = 0;
+int nand_sequential = 0;
 long nand_last_activity_value = -1;
 static long nand_stack[32];
 
@@ -528,28 +529,20 @@ uint32_t nand_read_page_fast(uint32_t page, void* databuffer,
     nand_last_activity_value = current_tick;
     led(true);
     if (!nand_powered) nand_power_up();
-    for (i = 0; i < 4; i++)
+    uint8_t status[4];
+    for (i = 0; i < 4; i++) status[i] = (nand_type[i] == 0xFFFFFFFF);
+    if (!status[0])
     {
-        if (nand_type[i] == 0xFFFFFFFF) continue;
-        nand_set_fmctrl0(i, FMCTRL0_ENABLEDMA);
+        nand_set_fmctrl0(0, FMCTRL0_ENABLEDMA);
         if (nand_send_cmd(NAND_CMD_READ))
-        {
-            rc |= 1 << (i << 2);
-            continue;
-        }
-        if (nand_send_address(page, databuffer ? 0 : 0x800))
-        {
-            rc |= 1 << (i << 2);
-            continue;
-        }
-        if (nand_send_cmd(NAND_CMD_READ2))
-        {
-            rc |= 1 << (i << 2);
-            continue;
-        }
+            status[0] = 1;
     }
-    uint8_t status[4];
-    for (i = 0; i < 4; i++) status[i] = (nand_type[i] == 0xFFFFFFFF);
+    if (!status[0])
+        if (nand_send_address(page, 0))
+            status[0] = 1;
+    if (!status[0])
+        if (nand_send_cmd(NAND_CMD_READ2))
+            status[0] = 1;
     if (!status[0])
         if (nand_wait_status_ready(0))
             status[0] = 1;
@@ -561,6 +554,18 @@ uint32_t nand_read_page_fast(uint32_t page, void* databuffer,
             status[0] = 1;
     for (i = 1; i < 4; i++)
     {
+        if (!status[i])
+        {
+            nand_set_fmctrl0(i, FMCTRL0_ENABLEDMA);
+            if (nand_send_cmd(NAND_CMD_READ))
+                status[i] = 1;
+        }
+        if (!status[i])
+            if (nand_send_address(page, 0))
+                status[i] = 1;
+        if (!status[i])
+            if (nand_send_cmd(NAND_CMD_READ2))
+                status[i] = 1;
         if (!status[i])
             if (nand_wait_status_ready(i))
                 status[i] = 1;
@@ -643,8 +648,8 @@ uint32_t nand_write_page_start(uint32_t bank, uint32_t page, void* databuffer,
                                void* sparebuffer, uint32_t doecc)
 {
     if (((uint32_t)databuffer & 0xf) || ((uint32_t)sparebuffer & 0xf)
-     || !databuffer || !sparebuffer || !doecc)
-        return nand_write_page_int(bank, page, databuffer, sparebuffer, doecc, 0);
+     || !databuffer || !sparebuffer || !doecc || nand_sequential)
+        return nand_write_page_int(bank, page, databuffer, sparebuffer, doecc, nand_sequential);
 
     mutex_lock(&nand_mtx);
     nand_last_activity_value = current_tick;
@@ -676,41 +681,6 @@ uint32_t nand_write_page_collect(uint32_t bank)
     return nand_wait_status_ready(bank);
 }
 
-uint32_t nand_block_erase_fast(uint32_t page)
-{
-    uint32_t i, rc = 0;
-    mutex_lock(&nand_mtx);
-    nand_last_activity_value = current_tick;
-    led(true);
-    if (!nand_powered) nand_power_up();
-    for (i = 0; i < 4; i++)
-    {
-        if (nand_type[i] == 0xFFFFFFFF) continue;
-        nand_set_fmctrl0(i, 0);
-        if (nand_send_cmd(NAND_CMD_BLOCKERASE))
-        {
-            rc |= 1 << i;
-            continue;
-        }
-        FMANUM = 2;
-        FMADDR0 = page;
-        FMCTRL1 = FMCTRL1_DOTRANSADDR;
-        if (nand_wait_cmddone())
-        {
-            rc |= 1 << i;
-            continue;
-        }
-        if (nand_send_cmd(NAND_CMD_ERASECNFRM)) rc |= 1 << i;
-    }
-    for (i = 0; i < 4; i++)
-    {
-        if (nand_type[i] == 0xFFFFFFFF) continue;
-        if (rc & (1 << i)) continue;
-        if (nand_wait_status_ready(i)) rc |= 1 << i;
-    }
-    return nand_unlock(rc);
-}
-
 const struct nand_device_info_type* nand_get_device_type(uint32_t bank)
 {
     if (nand_type[bank] == 0xFFFFFFFF)
@@ -769,6 +739,7 @@ uint32_t nand_device_init(void)
         nand_tunk3[i] = nand_deviceinfotable[nand_type[i]].tunk3;
     }
     if (nand_type[0] == 0xFFFFFFFF) return 1;
+    nand_sequential = !((nand_type[0] >> 22) & 1);
 
     nand_last_activity_value = current_tick;
     create_thread(nand_thread, nand_stack,
-- 
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