From 5aeaa84cab08154dc451a39902c376bd8a8922f4 Mon Sep 17 00:00:00 2001
From: Bertrik Sikken <bertrik@sikken.nl>
Date: Sun, 9 Aug 2009 16:12:36 +0000
Subject: Samsung YP-S3: add beginning of a low-level NAND driver and update
 bootloader demo program to display the NAND ids.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22221 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/s5l8700/yps3/nand-yps3.c | 109 +++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 firmware/target/arm/s5l8700/yps3/nand-yps3.c

(limited to 'firmware/target/arm/s5l8700/yps3/nand-yps3.c')

diff --git a/firmware/target/arm/s5l8700/yps3/nand-yps3.c b/firmware/target/arm/s5l8700/yps3/nand-yps3.c
new file mode 100644
index 0000000000..743c74261a
--- /dev/null
+++ b/firmware/target/arm/s5l8700/yps3/nand-yps3.c
@@ -0,0 +1,109 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 Bertrik Sikken
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <string.h>
+
+#include "config.h"
+#include "s5l8700.h"
+#include "nand-target.h"
+
+/*  Driver for the S5L8700 flash memory controller for low-level access to the
+    NAND flash of the Samsung YP-S3.
+
+    The YP-S3 seems to use the pins P6.5 and P6.6 as chip selects in GPIO mode
+    instead of using the regular pins P6.3 and P6.4.
+*/
+
+#define FMSTAT_RBB              (1<<0)
+#define FMSTAT_RBBDone          (1<<1)
+#define FMSTAT_CMDDone          (1<<2)
+#define FMSTAT_AddrDone         (1<<3)
+#define FMSTAT_TransDone        (1<<4)
+#define FMSTAT_WFIFO_HEMPTY     (1<<5)
+#define FMSTAT_RFIFO_HFULL      (1<<6)
+#define FMSTAT_WFIFO_EMPTY      (1<<8)
+#define FMSTAT_RFIFO_FULL       (1<<9)
+#define FMSTAT_EndECC           (1<<10)
+
+#define FMCTRL1_DoTransAddr     (1<<0)
+#define FMCTRL1_DoReadData      (1<<1)
+#define FMCTRL1_DoWriteData     (1<<2)
+#define FMCTRL1_WriteREQSEL     (1<<4)
+#define FMCTRL1_ClearSyndPtr    (1<<5)
+#define FMCTRL1_ClearWFIFO      (1<<6)
+#define FMCTRL1_ClearRFIFO      (1<<7)
+#define FMCTRL1_ParityPtr       (1<<8)
+#define FMCTRL1_SyndPtr         (1<<9)
+
+static void nand_chip_select(int bank)
+{
+    unsigned int select;
+
+    select = (1 << bank);
+    FMCTRL0 = 0x1821 | ((select & 3) << 1);
+    PDAT6 = (PDAT6 & ~0x60) | ((~select & 0xC) << 3);
+}
+
+void nand_ll_init(void)
+{
+    /* enable flash memory controller */
+    PWRCON &= ~(1 << 1);
+
+    /* P2.X is SMC I/O */
+    PCON2 = 0x55555555;
+    /* P4.1 = CLE, P4.4 = nWR, P4.5 = nRD */
+    PCON4 = (PCON4 & ~0x00FF00F0) | 0x00550050;
+    /* P6.0 = nf_rbn, P6.1 = smc_ce0, P6.2 = smc_ce1,
+       P6.5 = smc_ce2 (as GPIO), P6.6 = smc_ce3 (as GPIO), P6.7 = ALE */
+    PCON6 = (PCON6 & ~0xFFF00FFF) | 0x51100555;
+    PDAT6 |= 0x60;
+}
+
+unsigned int nand_ll_read_id(int bank)
+{
+    unsigned int nand_id;
+
+    nand_chip_select(bank);
+    
+    /* send "read id" command */
+    FMCMD = 0x90;
+    while ((FMCSTAT & FMSTAT_CMDDone) == 0);
+    FMCSTAT = FMSTAT_CMDDone;
+    
+    /* transfer address */
+    FMANUM = 0;
+    FMADDR0 = 0;
+    FMCTRL1 = FMCTRL1_DoTransAddr;
+    while ((FMCSTAT & FMSTAT_AddrDone) == 0);
+    FMCSTAT = FMSTAT_AddrDone;
+    
+    /* read back data */
+    FMDNUM = 3;
+    FMCTRL1 = FMCTRL1_DoReadData;
+    while ((FMCSTAT & FMSTAT_TransDone) == 0);
+    FMCSTAT = FMSTAT_TransDone;
+    nand_id = FMFIFO;
+    
+    /* clear read FIFO */
+    FMCTRL1 = FMCTRL1_ClearRFIFO;
+    
+    return nand_id;    
+}
+
-- 
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