Add SDRAM initialization

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2454 42af7a65-404d-4744-a932-0658087f49c3

4 files changed, 282 insertions, 1 deletions

diff --git a/nuttx/configs/ea3131/src/Makefile b/nuttx/configs/ea3131/src/Makefile
index a5eaae88a..e4db278f3 100755
--- a/nuttx/configs/ea3131/src/Makefile
+++ b/nuttx/configs/ea3131/src/Makefile
@@ -40,7 +40,7 @@ CFLAGS		+= -I$(TOPDIR)/sched
 ASRCS		= 
 AOBJS		= $(ASRCS:.S=$(OBJEXT))
 
-CSRCS		= up_boot.c up_buttons.c up_cgu.c up_leds.c up_spi.c
+CSRCS		= up_boot.c up_buttons.c up_cgu.c up_leds.c up_sdram.c up_spi.c
 ifeq ($(CONFIG_EXAMPLES_NSH_ARCHINIT),y)
 CSRCS		+= up_nsh.c
 endif
diff --git a/nuttx/configs/ea3131/src/ea3131_internal.h b/nuttx/configs/ea3131/src/ea3131_internal.h
index 5edf55019..05a4f36f9 100755
--- a/nuttx/configs/ea3131/src/ea3131_internal.h
+++ b/nuttx/configs/ea3131/src/ea3131_internal.h
@@ -74,6 +74,16 @@
  * Public Functions

  ************************************************************************************/

 

+/****************************************************************************

+ * Name: lpc313x_sdraminitialize

+ *

+ * Description:

+ *   Configure Micron MT48LC32M16A2 SDRAM on the EA3131 board

+ *

+ ****************************************************************************/

+

+extern void lpc313x_sdraminitialize(void);

+

 /************************************************************************************

  * Name: lpc313x_spiinitialize

  *

diff --git a/nuttx/configs/ea3131/src/up_boot.c b/nuttx/configs/ea3131/src/up_boot.c
index 9cb467870..f7e08f4cb 100755
--- a/nuttx/configs/ea3131/src/up_boot.c
+++ b/nuttx/configs/ea3131/src/up_boot.c
@@ -73,6 +73,10 @@
 

 void lpc313x_boardinitialize(void)

 {

+  /* Configure Micron MT48LC32M16A2 SDRAM on the EA3131 board */

+

+  lpc313x_sdraminitialize();

+

   /* Configure SPI chip selects if 1) SPI is not disabled, and 2) the weak function

    * lpc313x_spiinitialize() has been brought into the link.

    */

diff --git a/nuttx/configs/ea3131/src/up_sdram.c b/nuttx/configs/ea3131/src/up_sdram.c
new file mode 100755
index 000000000..cedfd1daf
--- /dev/null
+++ b/nuttx/configs/ea3131/src/up_sdram.c
@@ -0,0 +1,267 @@
+/****************************************************************************
+ * configs/ea3131/src/up_sdram.c
+ * arch/arm/src/board/up_sdram.c
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * References:
+ *   - NXP lpc313x.cdl.drivers.zip example driver code
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+
+#include "chip.h"
+#include "up_arch.h"
+
+#include "lpc313x_mpmc.h"
+#include "lpc313x_cgudrvr.h"
+#include "ea3131_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* Enables debug output from this file (needs CONFIG_DEBUG with
+ * CONFIG_DEBUG_VERBOSE too)
+ */
+
+#undef SDRAM_DEBUG  /* Define to enable debug */
+
+#ifdef SDRAM_DEBUG
+#  define sdramdbg  lldbg
+#  define sdramvdbg llvdbg
+#else
+#  define sdramdbg(x...)
+#  define sdramvdbg(x...)
+#endif
+
+/*Delay constants in nanosecondss for MT48LC32M16LF SDRAM on board */
+
+#define EA3131_SDRAM_TRP            (20)
+#define EA3131_SDRAM_TRFC           (66)
+#define EA3131_SDRAM_TRAS           (44)
+#define EA3131_SDRAM_TREX           (75)
+#define EA3131_SDRAM_TARP           4
+#define EA3131_SDRAM_TWR            (75)
+#define EA3131_SDRAM_TRC            (66)
+#define EA3131_SDRAM_TRRD           (15)
+#define EA3131_SDRAM_TMRD           (20)
+#define EA3131_SDRAM_TXSR           (75)
+#define EA3131_SDRAM_TDAL           (50)
+#define EA3131_SDRAM_REFRESH        (100)
+#define EA3131_SDRAM_OPERREFRESH    (7812)
+
+/* Macro used to convert the above values (in nanoseconds) into units of
+ * the HCLK.
+ */
+
+#define NS2HCLKS(ns,hclk2,mask) \
+  ((uint32_t)(((uint64_t)ns *(uint64_t)hclk2) / 1000000000ull) & mask)
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lpc313x_sdraminitialize
+ *
+ * Description:
+ *   Configure SDRAM on the EA3131 board
+ *
+ * Micron Initialization Sequence from their data sheet for the Micron
+ * MT48LC32M16A2 32M x 16 SDRAM chip:
+ *   
+ *   "SDRAMs must be powered up and initialized in a predefined manner.
+ *    Operational procedures other than those specified may result in
+ *    undefined operation. Once power is applied to VDD and VDDQ
+ *    (simultaneously) and the clock is stable (stable clock is defined as
+ *    a signal cycling within timing constraints specified for the clock
+ *    pin), the SDRAM requires a 100µs delay prior to issuing any command
+ *    other than a COMMAND INHIBIT or NOP.
+ *   
+ *   "Starting at some point during this 100µs period and continuing at least
+ *    through the end of this period, COMMAND INHIBIT or NOP commands should
+ *    be applied.  Once the 100µs delay has been satisfied with at least one
+ *    COMMAND INHIBIT or NOP command having been applied, a PRECHARGE command
+ *    should be applied. All banks must then be precharged, thereby placing
+ *    the device in the all banks idle state.
+ *   
+ *   "Once in the idle state, two AUTO REFRESH cycles must be performed. After
+ *    the AUTO REFRESH cycles are complete, the SDRAM is ready for mode
+ *    register programming.
+ *   
+ *   "Because the mode register will power up in an unknown state, it should
+ *    be loaded prior to applying any operational command."
+ *
+ *  The JEDEC recommendation for initializing SDRAM is:
+ *    
+ *    APPLY POWER (Vdd/Vddq equally, and CLK is stable)
+ *    Wait 200uS
+ *    PRECHARGE all
+ *    8 AUTO REFRESH COMMANDS
+ *    LOAD MODE REGISTER
+ *    SDRAM is ready for operation
+ *    
+ *  The Micron SDRAM parts will work fine with the JEDEC sequence, but also
+ *  allow for a quicker init sequence of:
+ *    
+ *    APPLY POWER (Vdd/Vddq equally, and CLK is stable)
+ *    Wait at least 100uS (during which time start applying and
+ *       continue applying NOP or COMMAND INHIBIT)
+ *    PRECHARGE all
+ *    2 AUTO REFRESH COMMANDS (min requirement, more than 2 is also ok)
+ *    LOAD MODE REGISTER
+ *    SDRAM is ready for operation
+ *
+ ****************************************************************************/
+
+void lpc313x_sdraminitialize(void)
+{
+  uint32_t tmp;
+  uint32_t regval;
+
+  /* These run-time calculations can be reduced dramatically if hclk is
+   * replaced with an apriori value.
+   */
+
+#ifdef CONFIG_LPC313X_SDRAMHCLK
+# define HCLK CONFIG_LPC313X_SDRAMHCLK
+#else
+  uint32_t hclk = lpc313x_clkfreq(CLKID_MPMCCFGCLK2, DOMAINID_SYS);
+# define HCLK hclk
+#endif
+
+  /* Check RTL for divide by 2 possible. If so change then enable the following logic */
+#if 0
+  uint32_t hclk2 = hclk;
+
+  if (((getreg32(LPC313X_MPMC_CONFIG) & MPMC_CONFIG_CLK)) != 0)
+    {
+      hclk2 >>= 1;
+    }
+# define HCLK2 hclk2
+#else
+# define HCLK2 hclk
+#endif
+  up_udelay(100);
+
+  /* Set command delay startergy */
+
+  putreg32(MPMC_DYNREADCONFIG_CMDDEL, LPC313X_MPMC_DYNREADCONFIG);
+
+  /* Configure device config register nSDCE0 for proper width SDRAM */
+
+  putreg32((MPMC_DYNCONFIG0_MDSDRAM|MPMC_DYNCONFIG_HP16_32MX16), LPC313X_MPMC_DYNCONFIG0);
+  putreg32((MPMC_DYNRASCAS0_RAS2CLK|MPMC_DYNRASCAS0_CAS2CLK), LPC313X_MPMC_DYNRASCAS0);
+
+  /* Min 20ns program 1 so that at least 2 HCLKs are used */
+
+  putreg32(NS2HCLKS(EA3131_SDRAM_TRP,  HCLK2, MPMC_DYNTRP_MASK),   LPC313X_MPMC_DYNTRP);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TRAS, HCLK2, MPMC_DYNTRAS_MASK),  LPC313X_MPMC_DYNTRAS);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TREX, HCLK2, MPMC_DYNTSREX_MASK), LPC313X_MPMC_DYNTSREX);
+  putreg32(EA3131_SDRAM_TARP,                                      LPC313X_MPMC_DYNTAPR);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TDAL, HCLK2, MPMC_DYNTDAL_MASK),  LPC313X_MPMC_DYNTDAL);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TWR,  HCLK2, MPMC_DYNTWR_MASK),   LPC313X_MPMC_DYNTWR);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TRC,  HCLK2, MPMC_DYNTRC_MASK),   LPC313X_MPMC_DYNTRC);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TRFC, HCLK2, MPMC_DYNTRFC_MASK),  LPC313X_MPMC_DYNTRFC);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TXSR, HCLK2, MPMC_DYNTXSR_MASK),  LPC313X_MPMC_DYNTXSR);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TRRD, HCLK2, MPMC_DYNTRRD_MASK),  LPC313X_MPMC_DYNTRRD);
+  putreg32(NS2HCLKS(EA3131_SDRAM_TMRD, HCLK2, MPMC_DYNTMRD_MASK),  LPC313X_MPMC_DYNTMRD);
+  up_udelay(100);
+  
+  /* Issue continuous NOP commands  */
+
+  putreg32((MPMC_DYNCONTROL_CE|MPMC_DYNCONTROL_CS|MPMC_DYNCONTROL_INOP), LPC313X_MPMC_DYNCONTROL);
+
+  /* Load ~200us delay value to timer1 */
+
+  up_udelay(200);
+  
+  /* Issue a "pre-charge all" command */
+
+  putreg32((MPMC_DYNCONTROL_CE|MPMC_DYNCONTROL_CS|MPMC_DYNCONTROL_IPALL), LPC313X_MPMC_DYNCONTROL);
+
+  /* Minimum refresh pulse interval (tRFC) for MT48LC32M16A2=80nsec, 100nsec provides more than adequate interval.
+   */
+
+  putreg32(NS2HCLKS(EA3131_SDRAM_REFRESH, HCLK, MPMC_DYNREFRESH_TIMER_MASK), LPC313X_MPMC_DYNREFRESH);
+
+  /* Load ~250us delay value to timer1 */
+
+  up_udelay(250);
+  
+  /* Recommended refresh interval for normal operation of the Micron MT48LC16LFFG = 7.8125usec (128KHz rate). ((HCLK / 128000) - 1) = refresh counter interval rate, (subtract one for safety margin).
+   */
+
+  putreg32(NS2HCLKS(EA3131_SDRAM_OPERREFRESH, HCLK, MPMC_DYNREFRESH_TIMER_MASK), LPC313X_MPMC_DYNREFRESH);
+
+  /* Select mode register update mode */
+
+  putreg32((MPMC_DYNCONTROL_CE|MPMC_DYNCONTROL_CS|MPMC_DYNCONTROL_IMODE), LPC313X_MPMC_DYNCONTROL);
+
+  /* Program the SDRAM internal mode registers on bank nSDCE0 and reconfigure the SDRAM chips.  Bus speeds up to 90MHz requires use of a CAS latency = 2. To get correct value on address bus CAS cycle, requires a shift by 13 for 16bit mode
+   */
+
+  tmp = getreg32(LPC313X_EXTSDRAM0_VSECTION | (0x23 << 13));
+  
+  putreg32((MPMC_DYNCONFIG0_MDSDRAM|MPMC_DYNCONFIG_HP16_32MX16), LPC313X_MPMC_DYNCONFIG0);
+  putreg32((MPMC_DYNRASCAS0_RAS2CLK|MPMC_DYNRASCAS0_CAS2CLK), LPC313X_MPMC_DYNRASCAS0);
+
+  /* Select normal operating mode */
+
+  putreg32((MPMC_DYNCONTROL_CE|MPMC_DYNCONTROL_CS|MPMC_DYNCONTROL_INORMAL), LPC313X_MPMC_DYNCONTROL);
+
+  /* Enable buffers */
+
+  regval  = getreg32(LPC313X_MPMC_DYNCONFIG0);
+  regval |= MPMC_DYNCONFIG0_B;
+  putreg32(regval, LPC313X_MPMC_DYNCONFIG0);
+
+  putreg32((MPMC_DYNCONTROL_INORMAL|MPMC_DYNCONTROL_CS), LPC313X_MPMC_DYNCONTROL);
+}