--- /dev/null
+/*******************************************************************
+ *
+ * File: ddr_oxsemi.c
+ *
+ * Description: Declarations for DDR routines and data objects
+ *
+ * Author: Julien Margetts
+ *
+ * Copyright: Oxford Semiconductor Ltd, 2009
+ */
+#include <common.h>
+#include <asm/arch/clock.h>
+
+#include "ddr.h"
+
+typedef unsigned int UINT;
+
+// DDR TIMING PARAMETERS
+typedef struct {
+ unsigned int holdoff_cmd_A;
+ unsigned int holdoff_cmd_ARW;
+ unsigned int holdoff_cmd_N;
+ unsigned int holdoff_cmd_LM;
+ unsigned int holdoff_cmd_R;
+ unsigned int holdoff_cmd_W;
+ unsigned int holdoff_cmd_PC;
+ unsigned int holdoff_cmd_RF;
+ unsigned int holdoff_bank_R;
+ unsigned int holdoff_bank_W;
+ unsigned int holdoff_dir_RW;
+ unsigned int holdoff_dir_WR;
+ unsigned int holdoff_FAW;
+ unsigned int latency_CAS;
+ unsigned int latency_WL;
+ unsigned int recovery_WR;
+ unsigned int width_update;
+ unsigned int odt_offset;
+ unsigned int odt_drive_all;
+ unsigned int use_fixed_re;
+ unsigned int delay_wr_to_re;
+ unsigned int wr_slave_ratio;
+ unsigned int rd_slave_ratio0;
+ unsigned int rd_slave_ratio1;
+} T_DDR_TIMING_PARAMETERS;
+
+// DDR CONFIG PARAMETERS
+
+typedef struct {
+ unsigned int ddr_mode;
+ unsigned int width;
+ unsigned int blocs;
+ unsigned int banks8;
+ unsigned int rams;
+ unsigned int asize;
+ unsigned int speed;
+ unsigned int cmd_mode_wr_cl_bl;
+} T_DDR_CONFIG_PARAMETERS;
+
+//cmd_mode_wr_cl_bl
+//when SDR : cmd_mode_wr_cl_bl = 0x80200002 + (latency_CAS_RAM * 16) + (recovery_WR - 1) * 512; -- Sets write rec XX, CL=XX; BL=8
+//else cmd_mode_wr_cl_bl = 0x80200003 + (latency_CAS_RAM * 16) + (recovery_WR - 1) * 512; -- Sets write rec XX, CL=XX; BL=8
+
+// cmd_ bank_ dir_ lat_ rec_ width_ odt_ odt_ fix delay ratio
+// A F C update offset all re re_to_we w r0 r1
+// R L P R R W A A W W
+//Timing Parameters A W N M R W C F R W W R W S L R
+static const T_DDR_TIMING_PARAMETERS C_TP_DDR2_25E_CL5_1GB = { 4, 5, 0, 2, 4, 4,
+ 5, 51, 23, 24, 9, 11, 18, 5, 4, 6, 3, 2, 0, 1, 2, 75, 56, 56 }; //elida device.
+static const T_DDR_TIMING_PARAMETERS C_TP_DDR2_25E_CL5_2GB = { 4, 5, 0, 2, 4, 4,
+ 5, 79, 22, 24, 9, 11, 20, 5, 4, 6, 3, 2, 0, 1, 2, 75, 56, 56 };
+static const T_DDR_TIMING_PARAMETERS C_TP_DDR2_25_CL6_1GB = { 4, 5, 0, 2, 4, 4,
+ 4, 51, 22, 26, 10, 12, 18, 6, 5, 6, 3, 2, 0, 1, 2, 75, 56, 56 }; // 400MHz, Speedgrade 25 timings (1Gb parts)
+
+// D B B R A S
+// D W L K A S P
+//Config Parameters R D C 8 M Z D CMD_MODE
+//static const T_DDR_CONFIG_PARAMETERS C_CP_DDR2_25E_CL5 = { 2,16, 1, 0, 1, 32,25,0x80200A53}; // 64 MByte
+static const T_DDR_CONFIG_PARAMETERS C_CP_DDR2_25E_CL5 = { 2, 16, 1, 1, 1, 64,
+ 25, 0x80200A53 }; // 128 MByte
+static const T_DDR_CONFIG_PARAMETERS C_CP_DDR2_25_CL6 = { 2, 16, 1, 1, 1, 128,
+ 25, 0x80200A63 }; // 256 MByte
+
+static void ddr_phy_poll_until_locked(void)
+{
+ volatile UINT reg_tmp = 0;
+ volatile UINT locked = 0;
+
+ //Extra read to put in delay before starting to poll...
+ reg_tmp = *(volatile UINT *) C_DDR_REG_PHY2; // read
+
+ //POLL C_DDR_PHY2_REG register until clock and flock
+ //!!! Ideally have a timeout on this.
+ while (locked == 0) {
+ reg_tmp = *(volatile UINT *) C_DDR_REG_PHY2; // read
+
+ //locked when bits 30 and 31 are set
+ if (reg_tmp & 0xC0000000) {
+ locked = 1;
+ }
+ }
+}
+
+static void ddr_poll_until_not_busy(void)
+{
+ volatile UINT reg_tmp = 0;
+ volatile UINT busy = 1;
+
+ //Extra read to put in delay before starting to poll...
+ reg_tmp = *(volatile UINT *) C_DDR_STAT_REG; // read
+
+ //POLL DDR_STAT register until no longer busy
+ //!!! Ideally have a timeout on this.
+ while (busy == 1) {
+ reg_tmp = *(volatile UINT *) C_DDR_STAT_REG; // read
+
+ //when bit 31 is clear - core is no longer busy
+ if ((reg_tmp & 0x80000000) == 0x00000000) {
+ busy = 0;
+ }
+ }
+}
+
+static void ddr_issue_command(int commmand)
+{
+ *(volatile UINT *) C_DDR_CMD_REG = commmand;
+ ddr_poll_until_not_busy();
+}
+
+static void ddr_timing_initialisation(
+ const T_DDR_TIMING_PARAMETERS *ddr_timing_parameters)
+{
+ volatile UINT reg_tmp = 0;
+ /* update the DDR controller registers for timing parameters */
+ reg_tmp = (ddr_timing_parameters->holdoff_cmd_A << 0);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_cmd_ARW << 4);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_cmd_N << 8);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_cmd_LM << 12);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_cmd_R << 16);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_cmd_W << 20);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_cmd_PC << 24);
+ *(volatile UINT *) C_DDR_REG_TIMING0 = reg_tmp;
+
+ reg_tmp = (ddr_timing_parameters->holdoff_cmd_RF << 0);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_bank_R << 8);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_bank_W << 16);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_dir_RW << 24);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_dir_WR << 28);
+ *(volatile UINT *) C_DDR_REG_TIMING1 = reg_tmp;
+
+ reg_tmp = (ddr_timing_parameters->latency_CAS << 0);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->latency_WL << 4);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->holdoff_FAW << 8);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->width_update << 16);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->odt_offset << 21);
+ reg_tmp = reg_tmp + (ddr_timing_parameters->odt_drive_all << 24);
+
+ *(volatile UINT *) C_DDR_REG_TIMING2 = reg_tmp;
+
+ /* Program the timing parameters in the PHY too */
+ reg_tmp = (ddr_timing_parameters->use_fixed_re << 16)
+ | (ddr_timing_parameters->delay_wr_to_re << 8)
+ | (ddr_timing_parameters->latency_WL << 4)
+ | (ddr_timing_parameters->latency_CAS << 0);
+
+ *(volatile UINT *) C_DDR_REG_PHY_TIMING = reg_tmp;
+
+ reg_tmp = ddr_timing_parameters->wr_slave_ratio;
+
+ *(volatile UINT *) C_DDR_REG_PHY_WR_RATIO = reg_tmp;
+
+ reg_tmp = ddr_timing_parameters->rd_slave_ratio0;
+ reg_tmp += ddr_timing_parameters->rd_slave_ratio1 << 8;
+
+ *(volatile UINT *) C_DDR_REG_PHY_RD_RATIO = reg_tmp;
+
+}
+
+static void ddr_normal_initialisation(
+ const T_DDR_CONFIG_PARAMETERS *ddr_config_parameters, int mhz)
+{
+ int i;
+ volatile UINT tmp = 0;
+ volatile UINT reg_tmp = 0;
+ volatile UINT emr_cmd = 0;
+ UINT refresh;
+
+ //Total size of memory in Mbits...
+ tmp = ddr_config_parameters->rams * ddr_config_parameters->asize
+ * ddr_config_parameters->width;
+ //Deduce value to program into DDR_CFG register...
+ switch (tmp) {
+ case 16:
+ reg_tmp = 0x00020000 * 1;
+ break;
+ case 32:
+ reg_tmp = 0x00020000 * 2;
+ break;
+ case 64:
+ reg_tmp = 0x00020000 * 3;
+ break;
+ case 128:
+ reg_tmp = 0x00020000 * 4;
+ break;
+ case 256:
+ reg_tmp = 0x00020000 * 5;
+ break;
+ case 512:
+ reg_tmp = 0x00020000 * 6;
+ break;
+ case 1024:
+ reg_tmp = 0x00020000 * 7;
+ break;
+ case 2048:
+ reg_tmp = 0x00020000 * 8;
+ break;
+ default:
+ reg_tmp = 0; //forces sims not to work if badly configured
+ }
+
+ //Memory width
+ tmp = ddr_config_parameters->rams * ddr_config_parameters->width;
+ switch (tmp) {
+ case 8:
+ reg_tmp = reg_tmp + 0x00400000;
+ break;
+ case 16:
+ reg_tmp = reg_tmp + 0x00200000;
+ break;
+ case 32:
+ reg_tmp = reg_tmp + 0x00000000;
+ break;
+ default:
+ reg_tmp = 0; //forces sims not to work if badly configured
+ }
+
+ //Setup DDR Mode
+ switch (ddr_config_parameters->ddr_mode) {
+ case 0:
+ reg_tmp = reg_tmp + 0x00000000;
+ break; //SDR
+ case 1:
+ reg_tmp = reg_tmp + 0x40000000;
+ break; //DDR
+ case 2:
+ reg_tmp = reg_tmp + 0x80000000;
+ break; //DDR2
+ default:
+ reg_tmp = 0; //forces sims not to work if badly configured
+ }
+
+ //Setup Banks
+ if (ddr_config_parameters->banks8 == 1) {
+ reg_tmp = reg_tmp + 0x00800000;
+ }
+
+ //Program DDR_CFG register...
+ *(volatile UINT *) C_DDR_CFG_REG = reg_tmp;
+
+ //Configure PHY0 reg - se_mode is bit 1,
+ //needs to be 1 for DDR (single_ended drive)
+ switch (ddr_config_parameters->ddr_mode) {
+ case 0:
+ reg_tmp = 2 + (0 << 4);
+ break; //SDR
+ case 1:
+ reg_tmp = 2 + (4 << 4);
+ break; //DDR
+ case 2:
+ reg_tmp = 0 + (4 << 4);
+ break; //DDR2
+ default:
+ reg_tmp = 0;
+ }
+
+ //Program DDR_PHY0 register...
+ *(volatile UINT *) C_DDR_REG_PHY0 = reg_tmp;
+
+ //Read DDR_PHY* registers to exercise paths for vcd
+ reg_tmp = *(volatile UINT *) C_DDR_REG_PHY3;
+ reg_tmp = *(volatile UINT *) C_DDR_REG_PHY2;
+ reg_tmp = *(volatile UINT *) C_DDR_REG_PHY1;
+ reg_tmp = *(volatile UINT *) C_DDR_REG_PHY0;
+
+ //Start up sequences - Different dependant on DDR mode
+ switch (ddr_config_parameters->ddr_mode) {
+ case 2: //DDR2
+ //Start-up sequence: follows procedure described in Micron datasheet.
+ //start up DDR PHY DLL
+ reg_tmp = 0x00022828; // dll on, start point and inc = h28
+ *(volatile UINT *) C_DDR_REG_PHY2 = reg_tmp;
+
+ reg_tmp = 0x00032828; // start on, dll on, start point and inc = h28
+ *(volatile UINT *) C_DDR_REG_PHY2 = reg_tmp;
+
+ ddr_phy_poll_until_locked();
+
+ udelay(200); //200us
+
+ //Startup SDRAM...
+ //!!! Software: CK should be running for 200us before wake-up
+ ddr_issue_command( C_CMD_WAKE_UP);
+ ddr_issue_command( C_CMD_NOP);
+ ddr_issue_command( C_CMD_PRECHARGE_ALL);
+ ddr_issue_command( C_CMD_DDR2_EMR2);
+ ddr_issue_command( C_CMD_DDR2_EMR3);
+
+ emr_cmd = C_CMD_DDR2_EMR1 + C_CMD_ODT_75 + C_CMD_REDUCED_DRIVE
+ + C_CMD_ENABLE_DLL;
+
+ ddr_issue_command(emr_cmd);
+ //Sets CL=3; BL=8 but also reset DLL to trigger a DLL initialisation...
+ udelay(1); //1us
+ ddr_issue_command(
+ ddr_config_parameters->cmd_mode_wr_cl_bl
+ + C_CMD_RESET_DLL);
+ udelay(1); //1us
+
+ //!!! Software: Wait 200 CK cycles before...
+ //for(i=1; i<=2; i++) {
+ ddr_issue_command(C_CMD_PRECHARGE_ALL);
+ // !!! Software: Wait here at least 8 CK cycles
+ //}
+ //need a wait here to ensure PHY DLL lock before the refresh is issued
+ udelay(1); //1us
+ for (i = 1; i <= 2; i++) {
+ ddr_issue_command( C_CMD_AUTO_REFRESH);
+ //!!! Software: Wait here at least 8 CK cycles to satify tRFC
+ udelay(1); //1us
+ }
+ //As before but without 'RESET_DLL' bit set...
+ ddr_issue_command(ddr_config_parameters->cmd_mode_wr_cl_bl);
+ udelay(1); //1us
+ // OCD commands
+ ddr_issue_command(emr_cmd + C_CMD_MODE_DDR2_OCD_DFLT);
+ ddr_issue_command(emr_cmd + C_CMD_MODE_DDR2_OCD_EXIT);
+ break;
+
+ default:
+ break; //Do nothing
+ }
+
+ //Enable auto-refresh
+
+ // 8192 Refreshes required every 64ms, so maximum refresh period is 7.8125 us
+ // We have a 400 MHz DDR clock (2.5ns period) so max period is 3125 cycles
+ // Our core now does 8 refreshes in a go, so we multiply this period by 8
+
+ refresh = (64000 * mhz) / 8192; // Refresh period in clocks
+
+ reg_tmp = *(volatile UINT *) C_DDR_CFG_REG; // read
+#ifdef BURST_REFRESH_ENABLE
+ reg_tmp |= C_CFG_REFRESH_ENABLE | (refresh * 8);
+ reg_tmp |= C_CFG_BURST_REFRESH_ENABLE;
+#else
+ reg_tmp |= C_CFG_REFRESH_ENABLE | (refresh * 1);
+ reg_tmp &= ~C_CFG_BURST_REFRESH_ENABLE;
+#endif
+ *(volatile UINT *) C_DDR_CFG_REG = reg_tmp;
+
+ //Verify register contents
+ reg_tmp = *(volatile UINT *) C_DDR_REG_PHY2; // read
+ //printf("Warning XXXXXXXXXXXXXXXXXXXXXX - get bad read data from C_DDR_PHY2_REG, though it looks OK on bus XXXXXXXXXXXXXXXXXX");
+ //TBD Check_data (read_data, dll_reg, "Error: bad C_DDR_PHY2_REG read", tb_pass);
+ reg_tmp = *(volatile UINT *) C_DDR_CFG_REG; // read
+ //TBD Check_data (read_data, cfg_reg, "Error: bad DDR_CFG read", tb_pass);
+
+ //disable optimised wrapping
+ if (ddr_config_parameters->ddr_mode == 2) {
+ reg_tmp = 0xFFFF0000;
+ *(volatile UINT *) C_DDR_REG_IGNORE = reg_tmp;
+ }
+
+ //enable midbuffer followon
+ reg_tmp = *(volatile UINT *) C_DDR_ARB_REG; // read
+ reg_tmp = 0xFFFF0000 | reg_tmp;
+ *(volatile UINT *) C_DDR_ARB_REG = reg_tmp;
+
+ // Enable write behind coherency checking for all clients
+
+ reg_tmp = 0xFFFF0000;
+ *(volatile UINT *) C_DDR_AHB4_REG = reg_tmp;
+
+ //Wait for 200 clock cycles for SDRAM DLL to lock...
+ udelay(1); //1us
+}
+
+// Function used to Setup DDR core
+
+void ddr_setup(int mhz)
+{
+ static const T_DDR_TIMING_PARAMETERS *ddr_timing_parameters =
+ &C_TP_DDR2_25_CL6_1GB;
+ static const T_DDR_CONFIG_PARAMETERS *ddr_config_parameters =
+ &C_CP_DDR2_25_CL6;
+
+ //Bring core out of Reset
+ *(volatile UINT *) C_DDR_BLKEN_REG = C_BLKEN_DDR_ON;
+
+ //DDR TIMING INITIALISTION
+ ddr_timing_initialisation(ddr_timing_parameters);
+
+ //DDR NORMAL INITIALISATION
+ ddr_normal_initialisation(ddr_config_parameters, mhz);
+
+ // route all writes through one client
+ *(volatile UINT *) C_DDR_TRANSACTION_ROUTING = (0
+ << DDR_ROUTE_CPU0_INSTR_SHIFT)
+ | (1 << DDR_ROUTE_CPU0_RDDATA_SHIFT)
+ | (3 << DDR_ROUTE_CPU0_WRDATA_SHIFT)
+ | (2 << DDR_ROUTE_CPU1_INSTR_SHIFT)
+ | (3 << DDR_ROUTE_CPU1_RDDATA_SHIFT)
+ | (3 << DDR_ROUTE_CPU1_WRDATA_SHIFT);
+
+ //Bring all clients out of reset
+ *(volatile UINT *) C_DDR_BLKEN_REG = C_BLKEN_DDR_ON + 0x0000FFFF;
+
+}
+
+void set_ddr_timing(unsigned int w, unsigned int i)
+{
+ unsigned int reg;
+ unsigned int wnow = 16;
+ unsigned int inow = 32;
+
+ /* reset all timing controls to known value (31) */
+ writel(DDR_PHY_TIMING_W_RST | DDR_PHY_TIMING_I_RST, DDR_PHY_TIMING);
+ writel(DDR_PHY_TIMING_W_RST | DDR_PHY_TIMING_I_RST | DDR_PHY_TIMING_CK,
+ DDR_PHY_TIMING);
+ writel(DDR_PHY_TIMING_W_RST | DDR_PHY_TIMING_I_RST, DDR_PHY_TIMING);
+
+ /* step up or down read delay to the requested value */
+ while (wnow != w) {
+ if (wnow < w) {
+ reg = DDR_PHY_TIMING_INC;
+ wnow++;
+ } else {
+ reg = 0;
+ wnow--;
+ }
+ writel(DDR_PHY_TIMING_W_CE | reg, DDR_PHY_TIMING);
+ writel(DDR_PHY_TIMING_CK | DDR_PHY_TIMING_W_CE | reg,
+ DDR_PHY_TIMING);
+ writel(DDR_PHY_TIMING_W_CE | reg, DDR_PHY_TIMING);
+ }
+
+ /* now write delay */
+ while (inow != i) {
+ if (inow < i) {
+ reg = DDR_PHY_TIMING_INC;
+ inow++;
+ } else {
+ reg = 0;
+ inow--;
+ }
+ writel(DDR_PHY_TIMING_I_CE | reg, DDR_PHY_TIMING);
+ writel(DDR_PHY_TIMING_CK | DDR_PHY_TIMING_I_CE | reg,
+ DDR_PHY_TIMING);
+ writel(DDR_PHY_TIMING_I_CE | reg, DDR_PHY_TIMING);
+ }
+}
+
+//Function used to Setup SDRAM in DDR/SDR mode
+void init_ddr(int mhz)
+{
+ /* start clocks */
+ enable_clock(SYS_CTRL_CLK_DDRPHY);
+ enable_clock(SYS_CTRL_CLK_DDR);
+ enable_clock(SYS_CTRL_CLK_DDRCK);
+
+ /* bring phy and core out of reset */
+ reset_block(SYS_CTRL_RST_DDR_PHY, 0);
+ reset_block(SYS_CTRL_RST_DDR, 0);
+
+ /* DDR runs at half the speed of the CPU */
+ ddr_setup(mhz >> 1);
+ return;
+}
projects / openwrt / staging / lynxis / omap.git / blobdiff