From cb41b2f2457015a3594eb63e917c5742564fc801 Mon Sep 17 00:00:00 2001
From: Michael Sparmann <theseven@rockbox.org>
Date: Sat, 13 Mar 2010 21:41:14 +0000
Subject: Nano2G NAND parallel read support

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25153 a1c6a512-1295-4272-9138-f99709370657
---
 .../target/arm/s5l8700/ipodnano2g/nand-nano2g.c    | 132 +++++++++++++++++++++
 1 file changed, 132 insertions(+)

(limited to 'firmware/target/arm')

diff --git a/firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c b/firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c
index 07eb344040..7e455f044c 100644
--- a/firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c
+++ b/firmware/target/arm/s5l8700/ipodnano2g/nand-nano2g.c
@@ -499,6 +499,138 @@ uint32_t nand_block_erase(uint32_t bank, uint32_t page)
     return nand_unlock(0);
 }
 
+uint32_t nand_read_page_fast(uint32_t page, void* databuffer,
+                             void* sparebuffer, uint32_t doecc,
+                             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;
+            void* databuf = (void*)0;
+            void* sparebuf = (void*)0;
+            if (databuffer) databuf = (void*)((uint32_t)databuffer + 0x800 * i);
+            if (sparebuffer) sparebuf = (void*)((uint32_t)sparebuffer + 0x40 * i);
+            uint32_t ret = nand_read_page(i, page, databuf, sparebuf, doecc, checkempty);
+            if (ret & 1) rc |= 1 << (i << 2);
+            if (ret & 2) rc |= 2 << (i << 2);
+            if (ret & 0x10) rc |= 4 << (i << 2);
+            if (ret & 0x100) rc |= 8 << (i << 2);
+        }
+        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);
+}
+
 const struct nand_device_info_type* nand_get_device_type(uint32_t bank)
 {
     if (nand_type[bank] == 0xFFFFFFFF)
-- 
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