TQM8548: Basic support for the TQM8548 modules

This patch adds basic support for the TQM8548 module from TQ-Components
(http://www.tqc.de/) including DDR2 SDRAM initialisation and support for
eTSEC 3 and 4

Furthermore Flash buffer write has been enabled to speed up output to
the Flash by approx. a factor of 10.

Signed-off-by: Thomas Waehner <thomas.waehner@tqs.de>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>

2 files changed, 248 insertions, 15 deletions

diff --git a/board/tqc/tqm85xx/sdram.c b/board/tqc/tqm85xx/sdram.c
index e005d84..442ff66 100644
--- a/board/tqc/tqm85xx/sdram.c
+++ b/board/tqc/tqm85xx/sdram.c
@@ -30,16 +30,27 @@
 struct sdram_conf_s {
 	unsigned long size;
 	unsigned long reg;
+#ifdef CONFIG_TQM8548
+	unsigned long refresh;
+#endif /* CONFIG_TQM8548 */
 };
 
 typedef struct sdram_conf_s sdram_conf_t;
 
+#ifdef CONFIG_TQM8548
+sdram_conf_t ddr_cs_conf[] = {
+	{(512 << 20), 0x80044102, 0x0001A000},	/* 512MB, 13x10(4)	*/
+	{(256 << 20), 0x80040102, 0x00014000},	/* 256MB, 13x10(4)	*/
+	{(128 << 20), 0x80040101, 0x0000C000},	/* 128MB, 13x9(4)	*/
+};
+#else /* !CONFIG_TQM8548 */
 sdram_conf_t ddr_cs_conf[] = {
 	{(512 << 20), 0x80000202},	/* 512MB, 14x10(4)	*/
 	{(256 << 20), 0x80000102},	/* 256MB, 13x10(4)	*/
 	{(128 << 20), 0x80000101},	/* 128MB, 13x9(4)	*/
 	{( 64 << 20), 0x80000001},	/*  64MB, 12x9(4)	*/
 };
+#endif /* CONFIG_TQM8548 */
 
 #define	N_DDR_CS_CONF (sizeof(ddr_cs_conf) / sizeof(ddr_cs_conf[0]))
 
@@ -56,8 +67,12 @@ long int sdram_setup (int casl)
 {
 	int i;
 	volatile ccsr_ddr_t *ddr = (void *)(CFG_MPC85xx_DDR_ADDR);
+#ifdef CONFIG_TQM8548
+	volatile ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
+#else /* !CONFIG_TQM8548 */
 	unsigned long cfg_ddr_timing1;
 	unsigned long cfg_ddr_mode;
+#endif /* CONFIG_TQM8548 */
 
 	/*
 	 * Disable memory controller.
@@ -65,6 +80,122 @@ long int sdram_setup (int casl)
 	ddr->cs0_config = 0;
 	ddr->sdram_cfg = 0;
 
+#ifdef CONFIG_TQM8548
+	ddr->cs0_bnds = (ddr_cs_conf[0].size - 1) >> 24;
+	ddr->cs0_config = ddr_cs_conf[0].reg;
+	ddr->timing_cfg_3 = 0x00010000;
+
+	/* TIMING CFG 1, 533MHz
+	 * PRETOACT: 4 Clocks
+	 * ACTTOPRE: 12 Clocks
+	 * ACTTORW:  4 Clocks
+	 * CASLAT:   4 Clocks
+	 * REFREC:   34 Clocks
+	 * WRREC:    4 Clocks
+	 * ACTTOACT: 3 Clocks
+	 * WRTORD:   2 Clocks
+	 */
+	ddr->timing_cfg_1 = 0x4C47A432;
+
+	/* TIMING CFG 2, 533MHz
+	 * ADD_LAT:       3 Clocks
+	 * CPO:           READLAT + 1
+	 * WR_LAT:        3 Clocks
+	 * RD_TO_PRE:     2 Clocks
+	 * WR_DATA_DELAY: 1/2 Clock
+	 * CKE_PLS:       1 Clock
+	 * FOUR_ACT:      13 Clocks
+	 */
+	ddr->timing_cfg_2 = 0x3318484D;
+
+	/* DDR SDRAM Mode, 533MHz
+	 * MRS:          Extended Mode Register
+	 * OUT:          Outputs enabled
+	 * RDQS:         no
+	 * DQS:          enabled
+	 * OCD:          default state
+	 * RTT:          75 Ohms
+	 * Posted CAS:   3 Clocks
+	 * ODS:          reduced strength
+	 * DLL:          enabled
+	 * MR:           Mode Register
+	 * PD:           fast exit
+	 * WR:           4 Clocks
+	 * DLL:          no DLL reset
+	 * TM:           normal
+	 * CAS latency:  4 Clocks
+	 * BT:           sequential
+	 * Burst length: 4
+	 */
+	ddr->sdram_mode = 0x439E0642;
+
+	/* DDR SDRAM Interval, 533MHz
+	 * REFINT:  1040 Clocks
+	 * BSTOPRE: 256
+	 */
+	ddr->sdram_interval = (1040 << 16) | 0x100;
+
+	/*
+	 * workaround for erratum DD10 of MPC8458 family below rev. 2.0:
+	 * DDR IO receiver must be set to an acceptable bias point by modifying
+	 * a hidden register.
+	 */
+	if (SVR_REV (get_svr ()) < 0x20) {
+		gur->ddrioovcr = 0x90000000;	/* enable, VSEL 1.8V */
+	}
+
+	/* DDR SDRAM CFG 2
+	 * FRC_SR:      normal mode
+	 * SR_IE:       no self-refresh interrupt
+	 * DLL_RST_DIS: don't care, leave at reset value
+	 * DQS_CFG:     differential DQS signals
+	 * ODT_CFG:     assert ODT to internal IOs only during reads to DRAM
+	 * LVWx_CFG:    don't care, leave at reset value
+	 * NUM_PR:      1 refresh will be issued at a time
+	 * DM_CFG:      don't care, leave at reset value
+	 * D_INIT:      no data initialization
+	 */
+	ddr->sdram_cfg_2 = 0x04401000;
+
+	/* DDR SDRAM MODE 2
+	 * MRS: Extended Mode Register 2
+	 */
+	ddr->sdram_mode_2 = 0x8000C000;
+
+	/* DDR SDRAM CLK CNTL
+	 * CLK_ADJUST: 1/2 Clock 0x02000000
+	 * CLK_ADJUST: 5/8 Clock 0x02800000
+	 */
+	ddr->sdram_clk_cntl = 0x02800000;
+
+	/* wait for clock stabilization */
+	asm ("sync;isync;msync");
+	udelay(1000);
+
+	/* DDR SDRAM CLK CNTL
+	 * MEM_EN:       enabled
+	 * SREN:         don't care, leave at reset value
+	 * ECC_EN:       no error report
+	 * RD_EN:        no register DIMMs
+	 * SDRAM_TYPE:   DDR2
+	 * DYN_PWR:      no power management
+	 * 32_BE:        don't care, leave at reset value
+	 * 8_BE:         4 beat burst
+	 * NCAP:         don't care, leave at reset value
+	 * 2T_EN:        1T Timing
+	 * BA_INTLV_CTL: no interleaving
+	 * x32_EN:       x16 organization
+	 * PCHB8:        MA[10] for auto-precharge
+	 * HSE:          half strength for single and 2-layer stacks
+	 * (full strength for 3- and 4-layer stacks no yet considered)
+	 * MEM_HALT:     no halt
+	 * BI:           automatic initialization
+	 */
+	ddr->sdram_cfg = 0x83000008;
+	asm ("sync; isync; msync");
+	udelay(1000);
+
+#else /* !CONFIG_TQM8548 */
 	switch (casl) {
 	case 20:
 		cfg_ddr_timing1 = 0x47405331 | (3 << 16);
@@ -97,6 +228,7 @@ long int sdram_setup (int casl)
 	ddr->sdram_cfg = 0xc2000000;		/* unbuffered,no DYN_PWR */
 	asm ("sync; isync; msync");
 	udelay (1000);
+#endif /* CONFIG_TQM8548 */
 
 	for (i = 0; i < N_DDR_CS_CONF; i++) {
 		ddr->cs0_config = ddr_cs_conf[i].reg;
@@ -108,11 +240,25 @@ long int sdram_setup (int casl)
 			 */
 			ddr->cs0_bnds = (ddr_cs_conf[i].size - 1) >> 24;
 
-			return ddr_cs_conf[i].size;
+			break;
 		}
 	}
 
-	return 0;		/* nothing found !              */
+#ifdef CONFIG_TQM8548
+	if (i < N_DDR_CS_CONF) {
+		/* Adjust refresh rate for DDR2 */
+
+		ddr->timing_cfg_3 = ddr_cs_conf[i].refresh & 0x00070000;
+
+		ddr->timing_cfg_1 = (ddr->timing_cfg_1 & 0xFFFF0FFF) |
+		    (ddr_cs_conf[i].refresh & 0x0000F000);
+
+		return ddr_cs_conf[i].size;
+	}
+#endif /* CONFIG_TQM8548 */
+
+	/* return size if detected, else return 0 */
+	return (i < N_DDR_CS_CONF) ? ddr_cs_conf[i].size : 0;
 }
 
 void board_add_ram_info (int use_default)
diff --git a/board/tqc/tqm85xx/tqm85xx.c b/board/tqc/tqm85xx/tqm85xx.c
index 17df3bb..f96cec3 100644
--- a/board/tqc/tqm85xx/tqm85xx.c
+++ b/board/tqc/tqm85xx/tqm85xx.c
@@ -1,4 +1,9 @@
 /*
+ * (C) Copyright 2008 Wolfgang Grandegger <wg@denx.de>
+ *
+ * (C) Copyright 2006
+ * Thomas Waehner, TQ-Systems GmbH, thomas.waehner@tqs.de.
+ *
  * (C) Copyright 2005
  * Stefan Roese, DENX Software Engineering, sr@denx.de.
  *
@@ -357,6 +362,30 @@ static void upmc_write (u_char addr, uint val)
 }
 #endif /* CONFIG_CAN_DRIVER */
 
+uint get_lbc_clock (void)
+{
+	volatile ccsr_lbc_t *lbc = (void *)(CFG_MPC85xx_LBC_ADDR);
+	sys_info_t sys_info;
+	ulong clkdiv = lbc->lcrr & 0x0f;
+
+	get_sys_info (&sys_info);
+
+	if (clkdiv == 2 || clkdiv == 4 || clkdiv == 8) {
+#ifdef CONFIG_MPC8548
+		/*
+		 * Yes, the entire PQ38 family use the same
+		 * bit-representation for twice the clock divider value.
+		 */
+		clkdiv *= 2;
+#endif
+		return sys_info.freqSystemBus / clkdiv;
+	}
+
+	puts("Invalid clock divider value in CFG_LBC_LCRR\n");
+
+	return 0;
+}
+
 /*
  * Initialize Local Bus
  */
@@ -364,10 +393,71 @@ void local_bus_init (void)
 {
 	volatile ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
 	volatile ccsr_lbc_t *lbc = (void *)(CFG_MPC85xx_LBC_ADDR);
+	uint lbc_mhz = get_lbc_clock ()  / 1000000;
+
+#ifdef CONFIG_MPC8548
+	uint svr = get_svr ();
+	uint lcrr;
+
+	/*
+	 * MPC revision < 2.0
+	 * According to MPC8548E_Device_Errata Rev. L, Erratum LBIU1:
+	 * Modify engineering use only register at address 0xE_0F20.
+	 * "1. Read register at offset 0xE_0F20
+	 * 2. And value with 0x0000_FFFF
+	 * 3. OR result with 0x0000_0004
+	 * 4. Write result back to offset 0xE_0F20."
+	 *
+	 * According to MPC8548E_Device_Errata Rev. L, Erratum LBIU2:
+	 * Modify engineering use only register at address 0xE_0F20.
+	 * "1. Read register at offset 0xE_0F20
+	 * 2. And value with 0xFFFF_FFDF
+	 * 3. Write result back to offset 0xE_0F20."
+	 *
+	 * Since it is the same register, we do the modification in one step.
+	 */
+	if (SVR_MAJ (svr) < 2) {
+		uint dummy = gur->lbiuiplldcr1;
+		dummy &= 0x0000FFDF;
+		dummy |= 0x00000004;
+		gur->lbiuiplldcr1 = dummy;
+	}
 
-	uint clkdiv;
-	uint lbc_hz;
-	sys_info_t sysinfo;
+	lcrr = CFG_LBC_LCRR;
+
+	/*
+	 * Local Bus Clock > 83.3 MHz. According to timing
+	 * specifications set LCRR[EADC] to 2 delay cycles.
+	 */
+	if (lbc_mhz > 83) {
+		lcrr &= ~LCRR_EADC;
+		lcrr |= LCRR_EADC_2;
+	}
+
+	/*
+	 * According to MPC8548ERMAD Rev. 1.3, 13.3.1.16, 13-30
+	 * disable PLL bypass for Local Bus Clock > 83 MHz.
+	 */
+	if (lbc_mhz >= 66)
+		lcrr &= (~LCRR_DBYP);	/* DLL Enabled */
+
+	else
+		lcrr |= LCRR_DBYP;	/* DLL Bypass */
+
+	lbc->lcrr = lcrr;
+	asm ("sync;isync;msync");
+
+	/*
+	 * According to MPC8548ERMAD Rev.1.3 read back LCRR
+	 * and terminate with isync
+	 */
+	lcrr = lbc->lcrr;
+	asm ("isync;");
+
+	/* let DLL stabilize */
+	udelay (500);
+
+#else /* !CONFIG_MPC8548 */
 
 	/*
 	 * Errata LBC11.
@@ -378,16 +468,12 @@ void local_bus_init (void)
 	 * Between 66 and 133, the DLL is enabled with an override workaround.
 	 */
 
-	get_sys_info (&sysinfo);
-	clkdiv = lbc->lcrr & 0x0f;
-	lbc_hz = sysinfo.freqSystemBus / 1000000 / clkdiv;
-
-	if (lbc_hz < 66) {
-		lbc->lcrr = CFG_LBC_LCRR | 0x80000000;	/* DLL Bypass */
+	if (lbc_mhz < 66) {
+		lbc->lcrr = CFG_LBC_LCRR | LCRR_DBYP;	/* DLL Bypass */
 		lbc->ltedr = 0xa4c80000;	/* DK: !!! */
 
-	} else if (lbc_hz >= 133) {
-		lbc->lcrr = CFG_LBC_LCRR & (~0x80000000);	/* DLL Enabled */
+	} else if (lbc_mhz >= 133) {
+		lbc->lcrr = CFG_LBC_LCRR & (~LCRR_DBYP);	/* DLL Enabled */
 
 	} else {
 		/*
@@ -402,7 +488,7 @@ void local_bus_init (void)
 			lbc->lcrr = 0x10000004;
 		}
 
-		lbc->lcrr = CFG_LBC_LCRR & (~0x80000000);	/* DLL Enabled */
+		lbc->lcrr = CFG_LBC_LCRR & (~LCRR_DBYP);	/* DLL Enabled */
 		udelay (200);
 
 		/*
@@ -413,13 +499,14 @@ void local_bus_init (void)
 		gur->lbcdllcr = (((temp_lbcdll & 0xff) << 16) | 0x80000000);
 		asm ("sync;isync;msync");
 	}
+#endif /* !CONFIG_MPC8548 */
 
 #ifdef	CONFIG_CAN_DRIVER
 	/*
 	 * According to timing specifications EAD must be
 	 * set if Local Bus Clock is > 83 MHz.
 	 */
-	if (lbc_hz > 83)
+	if (lbc_mhz > 83)
 		out_be32 (&lbc->or2, CFG_OR2_CAN | OR_UPM_EAD);
 	else
 		out_be32 (&lbc->or2, CFG_OR2_CAN);