APM821xx: Add CPU support

APM821XX is a new line of SoCs which are derivatives of
PPC44X family of processors. This patch adds support of CPU, cache,
tlb, 32k ocm, bootstraps, PLB and AHB bus.

Signed-off-by: Tirumala R Marri <tmarri@apm.com>
Signed-off-by: Stefan Roese <sr@denx.de>

arch/powerpc/cpu/ppc4xx/cpu.c

@@ -250,6 +250,20 @@ static char *bootstrap_str[] = {
 };
 static char bootstrap_char[] = { 'A', 'B', 'C', 'D', 'E', 'G', 'F', 'H' };
 #endif
+#if defined(CONFIG_APM821XX)
+#define SDR0_PINSTP_SHIFT       29
+static char *bootstrap_str[] = {
+	"RESERVED",
+	"RESERVED",
+	"RESERVED",
+	"NAND (8 bits)",
+	"NOR  (8 bits)",
+	"NOR  (8 bits) w/PLL Bypassed",
+	"I2C (Addr 0x54)",
+	"I2C (Addr 0x52)",
+};
+static char bootstrap_char[] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H' };
+#endif
 
 #if defined(SDR0_PINSTP_SHIFT)
 static int bootstrap_option(void)
@@ -590,6 +604,11 @@ int checkcpu (void)
 		strcpy(addstr, "No Security support");
 		break;
 
+	case PVR_APM821XX_RA:
+		puts("APM821XX Rev. A");
+		strcpy(addstr, "Security support");
+		break;
+
 	case PVR_VIRTEX5:
 		puts("440x5 VIRTEX5");
 		break;

arch/powerpc/cpu/ppc4xx/cpu_init.c

@@ -237,7 +237,8 @@ cpu_init_f (void)
 
 	reconfigure_pll(CONFIG_SYS_PLL_RECONFIG);
 
-#if (defined(CONFIG_405EP) || defined (CONFIG_405EX)) && !defined(CONFIG_SYS_4xx_GPIO_TABLE)
+#if (defined(CONFIG_405EP) || defined (CONFIG_405EX)) && \
+    !defined(CONFIG_APM821XX) &&!defined(CONFIG_SYS_4xx_GPIO_TABLE)
 	/*
 	 * GPIO0 setup (select GPIO or alternate function)
 	 */
@@ -393,7 +394,7 @@ cpu_init_f (void)
 #if defined(CONFIG_405EX) || \
     defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
     defined(CONFIG_460EX) || defined(CONFIG_460GT)  || \
-    defined(CONFIG_460SX)
+    defined(CONFIG_460SX) || defined(CONFIG_APM821XX)
 	/*
 	 * Set PLB4 arbiter (Segment 0 and 1) to 4 deep pipeline read
 	 */

arch/powerpc/cpu/ppc4xx/speed.c

@@ -189,7 +189,7 @@ ulong get_PCI_freq (void)
 #elif defined(CONFIG_440)
 
 #if defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
-    defined(CONFIG_460SX)
+    defined(CONFIG_460SX) || defined(CONFIG_APM821XX)
 static u8 pll_fwdv_multi_bits[] = {
 	/* values for:  1 - 16 */
 	0x00, 0x01, 0x0f, 0x04, 0x09, 0x0a, 0x0d, 0x0e, 0x03, 0x0c,
@@ -250,6 +250,78 @@ u32 get_cpr0_fbdv(unsigned long cpr_reg_fbdv)
 	return 0;
 }
 
+#if defined(CONFIG_APM821XX)
+
+void get_sys_info(sys_info_t *sysInfo)
+{
+	unsigned long plld;
+	unsigned long temp;
+	unsigned long mul;
+	unsigned long cpudv;
+	unsigned long plb2dv;
+	unsigned long ddr2dv;
+
+	/* Calculate Forward divisor A and Feeback divisor */
+	mfcpr(CPR0_PLLD, plld);
+
+	temp = CPR0_PLLD_FWDVA(plld);
+	sysInfo->pllFwdDivA = get_cpr0_fwdv(temp);
+
+	temp = CPR0_PLLD_FDV(plld);
+	sysInfo->pllFbkDiv = get_cpr0_fbdv(temp);
+
+	/* Calculate OPB clock divisor */
+	mfcpr(CPR0_OPBD, temp);
+	temp = CPR0_OPBD_OPBDV(temp);
+	sysInfo->pllOpbDiv = temp ? temp : 4;
+
+	/* Calculate Peripheral clock divisor */
+	mfcpr(CPR0_PERD, temp);
+	temp = CPR0_PERD_PERDV(temp);
+	sysInfo->pllExtBusDiv = temp ? temp : 4;
+
+	/* Calculate CPU clock divisor */
+	mfcpr(CPR0_CPUD, temp);
+	temp = CPR0_CPUD_CPUDV(temp);
+	cpudv = temp ? temp : 8;
+
+	/* Calculate PLB2 clock divisor */
+	mfcpr(CPR0_PLB2D, temp);
+	temp = CPR0_PLB2D_PLB2DV(temp);
+	plb2dv = temp ? temp : 4;
+
+	/* Calculate DDR2 clock divisor */
+	mfcpr(CPR0_DDR2D, temp);
+	temp = CPR0_DDR2D_DDR2DV(temp);
+	ddr2dv = temp ? temp : 4;
+
+	/* Calculate 'M' based on feedback source */
+	mfcpr(CPR0_PLLC, temp);
+	temp = CPR0_PLLC_SEL(temp);
+	if (temp == 0) {
+		/* PLL internal feedback */
+		mul = sysInfo->pllFbkDiv;
+	} else {
+		/* PLL PerClk feedback */
+		mul = sysInfo->pllFwdDivA * sysInfo->pllFbkDiv * cpudv
+			* plb2dv * 2 * sysInfo->pllOpbDiv *
+			  sysInfo->pllExtBusDiv;
+	}
+
+	/* Now calculate the individual clocks */
+	sysInfo->freqVCOMhz = (mul * CONFIG_SYS_CLK_FREQ) + (mul >> 1);
+	sysInfo->freqProcessor = sysInfo->freqVCOMhz /
+		sysInfo->pllFwdDivA / cpudv;
+	sysInfo->freqPLB = sysInfo->freqVCOMhz /
+		sysInfo->pllFwdDivA / cpudv / plb2dv / 2;
+	sysInfo->freqOPB = sysInfo->freqPLB / sysInfo->pllOpbDiv;
+	sysInfo->freqEBC = sysInfo->freqOPB / sysInfo->pllExtBusDiv;
+	sysInfo->freqDDR = sysInfo->freqVCOMhz /
+		sysInfo->pllFwdDivA / cpudv / ddr2dv / 2;
+	sysInfo->freqUART = sysInfo->freqPLB;
+}
+
+#else
 /*
  * AMCC_TODO: verify this routine against latest EAS, cause stuff changed
  *            with latest EAS
@@ -307,6 +379,7 @@ void get_sys_info (sys_info_t * sysInfo)
 
 	return;
 }
+#endif
 
 #elif defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
     defined(CONFIG_440EPX) || defined(CONFIG_440GRX)

arch/powerpc/cpu/ppc4xx/start.S

@@ -703,7 +703,8 @@ _start:
     defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
     defined(CONFIG_460SX)
 	mtdcr	L2_CACHE_CFG,r0		/* Ensure L2 Cache is off */
-#elif defined(CONFIG_460EX) || defined(CONFIG_460GT)
+#elif defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
+      defined(CONFIG_APM821XX)
 	lis	r1, 0x0000
 	ori	r1,r1,0x0008		/* Set L2_CACHE_CFG[RDBW]=1 */
 	mtdcr	L2_CACHE_CFG,r1
@@ -731,7 +732,8 @@ _start:
 	lis	r1, 0x8003
 	ori	r1,r1, 0x0980		/* fourth 64k */
 	mtdcr	ISRAM0_SB3CR,r1
-#elif defined(CONFIG_440SPE) || defined(CONFIG_460EX) || defined(CONFIG_460GT)
+#elif defined(CONFIG_440SPE) || defined(CONFIG_460EX) || \
+      defined(CONFIG_460GT) || defined(CONFIG_APM821XX)
 	lis	r1,0x0000		/* BAS = X_0000_0000 */
 	ori	r1,r1,0x0984		/* first 64k */
 	mtdcr	ISRAM0_SB0CR,r1
@@ -744,7 +746,8 @@ _start:
 	lis	r1, 0x0003
 	ori	r1,r1, 0x0984		/* fourth 64k */
 	mtdcr	ISRAM0_SB3CR,r1
-#if defined(CONFIG_460EX) || defined(CONFIG_460GT)
+#if defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
+    defined(CONFIG_APM821XX)
 	lis	r2,0x7fff
 	ori	r2,r2,0xffff
 	mfdcr	r1,ISRAM1_DPC
@@ -755,7 +758,7 @@ _start:
 	mtdcr	ISRAM1_PMEG,r1
 
 	lis	r1,0x0004		/* BAS = 4_0004_0000 */
-	ori	r1,r1,0x0984		/* 64k */
+	ori     r1,r1,ISRAM1_SIZE       /* ocm size */
 	mtdcr	ISRAM1_SB0CR,r1
 #endif
 #elif defined(CONFIG_460SX)

arch/powerpc/include/asm/apm821xx.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2010, Applied Micro Circuits Corporation
+ * Author: Tirumala R Marri <tmarri@apm.com>
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _APM821XX_H_
+#define _APM821XX_H_
+
+#define CONFIG_SDRAM_PPC4xx_IBM_DDR2	/* IBM DDR(2) controller */
+
+/* Memory mapped registers */
+#define CONFIG_SYS_PERIPHERAL_BASE	0xEF600000
+#define CONFIG_SYS_NS16550_COM1	(CONFIG_SYS_PERIPHERAL_BASE + 0x0200)
+#define CONFIG_SYS_NS16550_COM2	(CONFIG_SYS_PERIPHERAL_BASE + 0x0300)
+
+#define GPIO0_BASE		(CONFIG_SYS_PERIPHERAL_BASE + 0x0700)
+
+#define SDR0_SRST0_DMC		0x00200000
+#define SDR0_SRST1_AHB		0x00000040      /* PLB4XAHB bridge */
+
+/* AHB config. */
+#define AHB_TOP			0xA4
+#define AHB_BOT			0xA5
+
+/* clk divisors */
+#define PLLSYS0_FWD_DIV_A_MASK	0x000000f0	/* Fwd Div A */
+#define PLLSYS0_FWD_DIV_B_MASK	0x0000000f	/* Fwd Div B */
+#define PLLSYS0_FB_DIV_MASK	0x0000ff00	/* Feedback divisor */
+#define PLLSYS0_OPB_DIV_MASK	0x0c000000	/* OPB Divisor */
+#define PLLSYS0_EPB_DIV_MASK	0x00000300      /* EPB divisor */
+#define PLLSYS0_EXTSL_MASK	0x00000080      /* PerClk feedback path */
+#define PLLSYS0_PLBEDV0_DIV_MASK	0xe0000000/* PLB Early Clk Div*/
+#define PLLSYS0_PERCLK_DIV_MASK	0x03000000	/* Peripheral Clk Divisor */
+#define PLLSYS0_SEL_MASK	0x18000000	/* 0 = PLL, 1 = PerClk */
+
+/*
+   + * Clocking Controller
+   + */
+#define CPR0_CLKUPD	0x0020
+#define CPR0_PLLC	0x0040
+#define CPR0_PLLC_SEL(pllc)		(((pllc) & 0x01000000) >> 24)
+#define CPR0_PLLD	0x0060
+#define CPR0_PLLD_FDV(plld)		(((plld) & 0xff000000) >> 24)
+#define CPR0_PLLD_FWDVA(plld)		(((plld) & 0x000f0000) >> 16)
+#define CPR0_CPUD	0x0080
+#define CPR0_CPUD_CPUDV(cpud)		(((cpud) & 0x07000000) >> 24)
+#define CPR0_PLB2D	0x00a0
+#define CPR0_PLB2D_PLB2DV(plb2d)	(((plb2d) & 0x06000000) >> 25)
+#define CPR0_OPBD	0x00c0
+#define CPR0_OPBD_OPBDV(opbd)		(((opbd) & 0x03000000) >> 24)
+#define CPR0_PERD	0x00e0
+#define CPR0_PERD_PERDV(perd)		(((perd) & 0x03000000) >> 24)
+#define CPR0_DDR2D	0x0100
+#define CPR0_DDR2D_DDR2DV(ddr2d) 	(((ddr2d) & 0x06000000) >> 25)
+#define CLK_ICFG	0x0140
+
+#endif /* _APM821XX_H_ */

arch/powerpc/include/asm/ppc4xx-ebc.h

@@ -69,7 +69,8 @@
 #define EBC_NUM_BANKS	6
 #endif
 
-#if defined(CONFIG_440SP) || defined(CONFIG_440SPE)
+#if defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
+    defined(CONFIG_APM821XX)
 #define EBC_NUM_BANKS	3
 #endif
 

arch/powerpc/include/asm/ppc4xx-isram.h

@@ -25,7 +25,8 @@
 /*
  * Internal SRAM
  */
-#if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
+#if defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
+    defined(CONFIG_APM821XX)
 #define ISRAM0_DCR_BASE 0x380
 #else
 #define ISRAM0_DCR_BASE 0x020
@@ -42,7 +43,8 @@
 #define ISRAM0_REVID	(ISRAM0_DCR_BASE+0x09)	/* SRAM bus revision id reg */
 #define ISRAM0_DPC	(ISRAM0_DCR_BASE+0x0a)	/* SRAM data parity check reg */
 
-#if defined(CONFIG_460EX) || defined(CONFIG_460GT)
+#if defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
+    defined(CONFIG_APM821XX)
 #define ISRAM1_DCR_BASE 0x0B0
 #define ISRAM1_SB0CR	(ISRAM1_DCR_BASE+0x00)	/* SRAM1 bank config 0*/
 #define ISRAM1_BEAR	(ISRAM1_DCR_BASE+0x04)	/* SRAM1 bus error addr reg */
@@ -54,13 +56,19 @@
 #define ISRAM1_DPC	(ISRAM1_DCR_BASE+0x0a)	/* SRAM1 data parity check reg */
 #endif /* CONFIG_460EX || CONFIG_460GT */
 
+#if defined(CONFIG_460EX) || defined(CONFIG_460GT)
+#define ISRAM1_SIZE 0x0984 /* OCM size 64k */
+#elif defined(CONFIG_APM821XX)
+#define ISRAM1_SIZE 0x0784 /* OCM size 32k */
+#endif
+
 /*
  * L2 Cache
  */
 #if defined (CONFIG_440GX) || \
     defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
     defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
-    defined(CONFIG_460SX)
+    defined(CONFIG_460SX) || defined(CONFIG_APM821XX)
 #define L2_CACHE_BASE	0x030
 #define L2_CACHE_CFG	(L2_CACHE_BASE+0x00)	/* L2 Cache Config      */
 #define L2_CACHE_CMD	(L2_CACHE_BASE+0x01)	/* L2 Cache Command     */

arch/powerpc/include/asm/ppc4xx-sdram.h

@@ -292,7 +292,7 @@
  */
 #if defined(CONFIG_440SPE) || \
     defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
-    defined(CONFIG_460SX)
+    defined(CONFIG_460SX) || defined(CONFIG_APM821XX)
 #define SDRAM_RXBAS_SDBA_MASK		0xFFE00000	/* Base address	*/
 #define SDRAM_RXBAS_SDBA_ENCODE(n)	((u32)(((phys_size_t)(n) >> 2) & 0xFFE00000))
 #define SDRAM_RXBAS_SDBA_DECODE(n)	((((phys_size_t)(n)) & 0xFFE00000) << 2)
@@ -365,7 +365,7 @@
 /*
  * Memory controller registers
  */
-#ifdef CONFIG_405EX
+#if defined(CONFIG_405EX) || defined(CONFIG_APM821XX)
 #define SDRAM_BESR	0x00	/* PLB bus error status (read/clear)         */
 #define SDRAM_BESRT	0x01	/* PLB bus error status (test/set)           */
 #define SDRAM_BEARL	0x02	/* PLB bus error address low                 */
@@ -375,9 +375,9 @@
 #define SDRAM_PLBOPT	0x08	/* PLB slave options                         */
 #define SDRAM_PUABA	0x09	/* PLB upper address base                    */
 #define SDRAM_MCSTAT	0x1F	/* memory controller status                  */
-#else /* CONFIG_405EX */
+#else /* CONFIG_405EX || CONFIG_APM821XX */
 #define SDRAM_MCSTAT	0x14	/* memory controller status                  */
-#endif /* CONFIG_405EX */
+#endif /* CONFIG_405EX || CONFIG_APM821XX */
 #define SDRAM_MCOPT1	0x20	/* memory controller options 1               */
 #define SDRAM_MCOPT2	0x21	/* memory controller options 2               */
 #define SDRAM_MODT0	0x22	/* on die termination for bank 0             */
@@ -423,12 +423,12 @@
 #define SDRAM_MEMODE	0x89	/* memory extended mode                      */
 #define SDRAM_ECCES	0x98	/* ECC error status                          */
 #define SDRAM_CID	0xA4	/* core ID                                   */
-#ifndef CONFIG_405EX
+#if !defined(CONFIG_405EX) && !defined(CONFIG_APM821XX)
 #define SDRAM_RID	0xA8	/* revision ID                               */
 #endif
 #define SDRAM_FCSR	0xB0	/* feedback calibration status               */
 #define SDRAM_RTSR	0xB1	/* run time status tracking                  */
-#ifdef CONFIG_405EX
+#if  defined(CONFIG_405EX) || defined(CONFIG_APM821XX)
 #define SDRAM_RID	0xF8	/* revision ID                               */
 #endif
 

arch/powerpc/include/asm/ppc4xx-uic.h

@@ -31,7 +31,7 @@
  */
 #if defined(CONFIG_440GX) || defined(CONFIG_440SPE) || \
     defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
-    defined(CONFIG_460SX)
+    defined(CONFIG_460SX) || defined(CONFIG_APM821XX)
 #define UIC_MAX		4
 #elif defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
     defined(CONFIG_405EX)
@@ -252,7 +252,8 @@
 #define VECNUM_ETH0		(32 + 28)
 #endif /* CONFIG_440SPE */
 
-#if defined(CONFIG_460EX) || defined(CONFIG_460GT)
+#if defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
+    defined(CONFIG_APM821XX)
 /* UIC 0 */
 #define VECNUM_UIC2NCI		10
 #define VECNUM_UIC2CI		11

arch/powerpc/include/asm/ppc4xx.h

@@ -79,6 +79,10 @@
 #include <asm/ppc460sx.h>
 #endif
 
+#if defined(CONFIG_APM821XX)
+#include <asm/apm821xx.h>
+#endif
+
 /*
  * Configure which SDRAM/DDR/DDR2 controller is equipped
  */

arch/powerpc/include/asm/processor.h

@@ -916,6 +916,7 @@
 #define PVR_460SX_RA_V1 0x13541801 /* 460SX rev A Variant 1 Security disabled */
 #define PVR_460GX_RA    0x13541802 /* 460GX rev A                   */
 #define PVR_460GX_RA_V1 0x13541803 /* 460GX rev A Variant 1 Security disabled */
+#define PVR_APM821XX_RA 0x12C41C80 /* APM821XX rev A */
 #define PVR_601		0x00010000
 #define PVR_602		0x00050000
 #define PVR_603		0x00030000