Finally fast Nano2G NAND reading, also works on remapped blocks this time.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25181 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/s5l8700/ipodnano2g/ftl-nano2g.c

@@ -864,7 +864,13 @@ uint32_t ftl_vfl_read_fast(uint32_t vpage, void* buffer, void* sparebuffer,
         //return 4;
 
     uint32_t bank = abspage % ftl_banks;
-//    if (bank)
+    uint32_t block = abspage / ((*ftl_nand_type).pagesperblock * ftl_banks);
+    uint32_t page = (abspage / ftl_banks) % (*ftl_nand_type).pagesperblock;
+    uint32_t remapped = 0;
+    for (i = 0; i < ftl_banks; i++)
+        if (ftl_vfl_get_physical_block(i, block) != block)
+            remapped = 1;
+    if (bank || remapped)
     {
         for (i = 0; i < ftl_banks; i++)
         {
@@ -880,10 +886,7 @@ uint32_t ftl_vfl_read_fast(uint32_t vpage, void* buffer, void* sparebuffer,
         }
         return rc;
     }
-    uint32_t block = abspage / ((*ftl_nand_type).pagesperblock * ftl_banks);
+    uint32_t physpage = block * (*ftl_nand_type).pagesperblock + page;
-    uint32_t page = (abspage / ftl_banks) % (*ftl_nand_type).pagesperblock;
-    uint32_t physblock = ftl_vfl_get_physical_block(bank, block);
-    uint32_t physpage = physblock * (*ftl_nand_type).pagesperblock + page;
 
     rc = nand_read_page_fast(physpage, buffer, sparebuffer, 1, checkempty);
     if (!(rc & 0xdddd)) return rc;

firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c

@@ -508,6 +508,9 @@ uint32_t nand_read_page_fast(uint32_t page, void* databuffer,
                              uint32_t checkempty)
 {
     uint32_t i, rc = 0;
+    if (((uint32_t)databuffer & 0xf) || ((uint32_t)sparebuffer & 0xf)
+     || !databuffer || !sparebuffer || !doecc)
+    {
         for (i = 0; i < 4; i++)
         {
             if (nand_type[i] == 0xFFFFFFFF) continue;
@@ -523,6 +526,114 @@ uint32_t nand_read_page_fast(uint32_t page, void* databuffer,
         }
         return rc;
     }
+    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, 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;
+        }
+    }
+    uint8_t status[4];
+    for (i = 0; i < 4; i++) status[i] = (nand_type[i] == 0xFFFFFFFF);
+    if (!status[0])
+        if (nand_wait_status_ready(0))
+            status[0] = 1;
+    if (!status[0])
+        if (nand_transfer_data(0, 0, databuffer, 0x800))
+            status[0] = 1;
+    if (!status[0])
+        if (nand_transfer_data(0, 0, sparebuffer, 0x40))
+            status[0] = 1;
+    for (i = 1; i < 4; i++)
+    {
+        if (!status[i])
+            if (nand_wait_status_ready(i))
+                status[i] = 1;
+        if (!status[i])
+            nand_transfer_data_start(i, 0, (void*)((uint32_t)databuffer
+                                                 + 0x800 * i), 0x800);
+        if (!status[i - 1])
+        {
+            memcpy(nand_ecc, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1) + 0xC), 0x28);
+            ecc_start(3, (void*)((uint32_t)databuffer
+                               + 0x800 * (i - 1)), nand_ecc, ECCCTRL_STARTDECODING);
+        }
+        if (!status[i])
+            if (nand_transfer_data_collect(0))
+                status[i] = 1;
+        if (!status[i])
+            nand_transfer_data_start(i, 0, (void*)((uint32_t)sparebuffer
+                                                 + 0x40 * i), 0x40);
+        if (!status[i - 1])
+            if (ecc_collect() & 1)
+                status[i - 1] = 4;
+        if (!status[i - 1])
+        {
+            memset(nand_ctrl, 0xFF, 0x200);
+            memcpy(nand_ctrl, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), 0xC);
+            memcpy(nand_ecc, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1) + 0x34), 0xC);
+            ecc_start(0, nand_ctrl, nand_ecc, ECCCTRL_STARTDECODING);
+        }
+        if (!status[i])
+            if (nand_transfer_data_collect(0))
+                status[i] = 1;
+        if (!status[i - 1])
+        {
+            if (ecc_collect() & 1)
+            {
+                status[i - 1] |= 8;
+                memset((void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), 0xFF, 0xC);
+            }
+            else memcpy((void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), nand_ctrl, 0xC);
+            if (checkempty)
+                status[i - 1] |= nand_check_empty((void*)((uint32_t)sparebuffer
+                                                        + 0x40 * (i - 1))) << 1;
+        }
+    }
+    if (!status[i - 1])
+    {
+        memcpy(nand_ecc,(void*)((uint32_t)sparebuffer + 0x40 * (i - 1) + 0xC), 0x28);
+        if (ecc_decode(3, (void*)((uint32_t)databuffer
+                                + 0x800 * (i - 1)), nand_ecc) & 1)
+            status[i - 1] = 4;
+    }
+    if (!status[i - 1])
+    {
+        memset(nand_ctrl, 0xFF, 0x200);
+        memcpy(nand_ctrl, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), 0xC);
+        memcpy(nand_ecc, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1) + 0x34), 0xC);
+        if (ecc_decode(0, nand_ctrl, nand_ecc) & 1)
+        {
+            status[i - 1] |= 8;
+            memset((void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), 0xFF, 0xC);
+        }
+        else memcpy((void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), nand_ctrl, 0xC);
+        if (checkempty)
+            status[i - 1] |= nand_check_empty((void*)((uint32_t)sparebuffer
+                                                    + 0x40 * (i - 1))) << 1;
+    }
+    for (i = 0; i < 4; i++)
+        if (nand_type[i] != 0xFFFFFFFF)
+            rc |= status[i] << (i << 2);
+    return nand_unlock(rc);
+}
 
 uint32_t nand_write_page(uint32_t bank, uint32_t page, void* databuffer,
                          void* sparebuffer, uint32_t doecc)