85xx: Move LAW init code into C

Move the initialization of the LAWs into C code and provide an API
to allow modification of LAWs after init.

Board code is responsible to provide a law_table and num_law_entries.

We should be able to use the same code on 86xx as well.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

6 files changed, 169 insertions, 0 deletions

diff --git a/cpu/mpc85xx/cpu_init.c b/cpu/mpc85xx/cpu_init.c
index fdb9ecb..9a65142 100644
--- a/cpu/mpc85xx/cpu_init.c
+++ b/cpu/mpc85xx/cpu_init.c
@@ -31,6 +31,7 @@
 #include <asm/processor.h>
 #include <ioports.h>
 #include <asm/io.h>
+#include <asm/fsl_law.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -140,6 +141,9 @@ void cpu_init_f (void)
 	/* Clear initial global data */
 	memset ((void *) gd, 0, sizeof (gd_t));
 
+#ifdef CONFIG_FSL_LAW
+	init_laws();
+#endif
 
 #ifdef CONFIG_CPM2
 	config_8560_ioports((ccsr_cpm_t *)CFG_MPC85xx_CPM_ADDR);
@@ -222,11 +226,15 @@ void cpu_init_f (void)
 int cpu_init_r(void)
 {
 #ifdef CONFIG_CLEAR_LAW0
+#ifdef CONFIG_FSL_LAW
+	disable_law(0);
+#else
 	volatile ccsr_local_ecm_t *ecm = (void *)(CFG_MPC85xx_ECM_ADDR);
 
 	/* clear alternate boot location LAW (used for sdram, or ddr bank) */
 	ecm->lawar0 = 0;
 #endif
+#endif
 
 #if defined(CONFIG_L2_CACHE)
 	volatile ccsr_l2cache_t *l2cache = (void *)CFG_MPC85xx_L2_ADDR;
diff --git a/cpu/mpc85xx/spd_sdram.c b/cpu/mpc85xx/spd_sdram.c
index adc9c4d..bb5dc1f 100644
--- a/cpu/mpc85xx/spd_sdram.c
+++ b/cpu/mpc85xx/spd_sdram.c
@@ -27,6 +27,7 @@
 #include <i2c.h>
 #include <spd.h>
 #include <asm/mmu.h>
+#include <asm/fsl_law.h>
 
 
 #if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
@@ -1022,7 +1023,9 @@ spd_sdram(void)
 static unsigned int
 setup_laws_and_tlbs(unsigned int memsize)
 {
+#ifndef CONFIG_FSL_LAW
 	volatile ccsr_local_ecm_t *ecm = (void *)(CFG_MPC85xx_ECM_ADDR);
+#endif
 	unsigned int tlb_size;
 	unsigned int law_size;
 	unsigned int ram_tlb_index;
@@ -1098,12 +1101,17 @@ setup_laws_and_tlbs(unsigned int memsize)
 	/*
 	 * Set up LAWBAR for all of DDR.
 	 */
+
+#ifdef CONFIG_FSL_LAW
+	set_law(1, CFG_DDR_SDRAM_BASE, law_size, LAW_TRGT_IF_DDR);
+#else
 	ecm->lawbar1 = ((CFG_DDR_SDRAM_BASE >> 12) & 0xfffff);
 	ecm->lawar1 = (LAWAR_EN
 		       | LAWAR_TRGT_IF_DDR
 		       | (LAWAR_SIZE & law_size));
 	debug("DDR: LAWBAR1=0x%08x\n", ecm->lawbar1);
 	debug("DDR: LARAR1=0x%08x\n", ecm->lawar1);
+#endif
 
 	/*
 	 * Confirm that the requested amount of memory was mapped.
diff --git a/cpu/mpc85xx/start.S b/cpu/mpc85xx/start.S
index b489d2f..346369c 100644
--- a/cpu/mpc85xx/start.S
+++ b/cpu/mpc85xx/start.S
@@ -201,6 +201,7 @@ _start_e500:
 	lis	r7,CFG_CCSRBAR@h
 	ori	r7,r7,CFG_CCSRBAR@l
 
+#ifndef CONFIG_FSL_LAW
 	bl	law_entry
 	mr	r6,r0
 	lwzu	r5,0(r6)	/* how many windows we actually use */
@@ -216,6 +217,7 @@ _start_e500:
 	addi	r2,r2,0x0020
 	addi	r1,r1,0x0020
 	bdnz	0b
+#endif
 
 	/* Clear and set up some registers. */
 	li      r0,0
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 78cec21..67521720 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -28,6 +28,7 @@ LIB 	:= $(obj)libmisc.a
 COBJS-y += ali512x.o
 COBJS-y += ns87308.o
 COBJS-y += status_led.o
+COBJS-$(CONFIG_FSL_LAW) += fsl_law.o
 
 COBJS	:= $(COBJS-y)
 SRCS 	:= $(COBJS:.o=.c)
diff --git a/drivers/misc/fsl_law.c b/drivers/misc/fsl_law.c
new file mode 100644
index 0000000..8bdf5a7
--- /dev/null
+++ b/drivers/misc/fsl_law.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/fsl_law.h>
+#include <asm/io.h>
+
+#define LAWAR_EN	0x80000000
+
+void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
+{
+	volatile u32 *base = (volatile u32 *)(CFG_IMMR + 0xc08);
+	volatile u32 *lawbar = base + 8 * idx;
+	volatile u32 *lawar = base + 8 * idx + 2;
+
+	out_be32(lawbar, addr >> 12);
+	out_be32(lawar, LAWAR_EN | ((u32)id << 20) | (u32)sz);
+
+	return ;
+}
+
+void disable_law(u8 idx)
+{
+	volatile u32 *base = (volatile u32 *)(CFG_IMMR + 0xc08);
+	volatile u32 *lawbar = base + 8 * idx;
+	volatile u32 *lawar = base + 8 * idx + 2;
+
+	out_be32(lawar, 0);
+	out_be32(lawbar, 0);
+
+	return;
+}
+
+void init_laws(void)
+{
+	int i;
+	u8 law_idx = 0;
+
+	for (i = 0; i < num_law_entries; i++) {
+		if (law_table[i].index != -1)
+			law_idx = law_table[i].index;
+
+		set_law(law_idx++, law_table[i].addr,
+			law_table[i].size, law_table[i].trgt_id);
+	}
+
+	return ;
+}
diff --git a/include/asm-ppc/fsl_law.h b/include/asm-ppc/fsl_law.h
new file mode 100644
index 0000000..7cb8840
--- /dev/null
+++ b/include/asm-ppc/fsl_law.h
@@ -0,0 +1,80 @@
+#ifndef _FSL_LAW_H_
+#define _FSL_LAW_H_
+
+#include <asm/io.h>
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+#define SET_LAW_ENTRY(idx, a, sz, trgt) \
+	{ .index = idx, .addr = a, .size = sz, .trgt_id = trgt }
+
+enum law_size {
+	LAW_SIZE_4K = 0xb,
+	LAW_SIZE_8K,
+	LAW_SIZE_16K,
+	LAW_SIZE_32K,
+	LAW_SIZE_64K,
+	LAW_SIZE_128K,
+	LAW_SIZE_256K,
+	LAW_SIZE_512K,
+	LAW_SIZE_1M,
+	LAW_SIZE_2M,
+	LAW_SIZE_4M,
+	LAW_SIZE_8M,
+	LAW_SIZE_16M,
+	LAW_SIZE_32M,
+	LAW_SIZE_64M,
+	LAW_SIZE_128M,
+	LAW_SIZE_256M,
+	LAW_SIZE_512M,
+	LAW_SIZE_1G,
+	LAW_SIZE_2G,
+	LAW_SIZE_4G,
+	LAW_SIZE_8G,
+	LAW_SIZE_16G,
+	LAW_SIZE_32G,
+};
+
+enum law_trgt_if {
+	LAW_TRGT_IF_PCI = 0x00,
+	LAW_TRGT_IF_PCI_2 = 0x01,
+#ifndef CONFIG_MPC8641
+	LAW_TRGT_IF_PCIE_1 = 0x02,
+#endif
+#ifndef CONFIG_MPC8572
+	LAW_TRGT_IF_PCIE_3 = 0x03,
+#endif
+	LAW_TRGT_IF_LBC = 0x04,
+	LAW_TRGT_IF_CCSR = 0x08,
+	LAW_TRGT_IF_DDR_INTRLV = 0x0b,
+	LAW_TRGT_IF_RIO = 0x0c,
+	LAW_TRGT_IF_DDR = 0x0f,
+	LAW_TRGT_IF_DDR_2 = 0x16,	/* 2nd controller */
+};
+#define LAW_TRGT_IF_DDR_1	LAW_TRGT_IF_DDR
+#define LAW_TRGT_IF_PCI_1	LAW_TRGT_IF_PCI
+#define LAW_TRGT_IF_PCIX	LAW_TRGT_IF_PCI
+#define LAW_TRGT_IF_PCIE_2	LAW_TRGT_IF_PCI_2
+
+#ifdef CONFIG_MPC8641
+#define LAW_TRGT_IF_PCIE_1	LAW_TRGT_IF_PCI
+#endif
+
+#ifdef CONFIG_MPC8572
+#define LAW_TRGT_IF_PCIE_3	LAW_TRGT_IF_PCI
+#endif
+
+struct law_entry {
+	int index;
+	phys_addr_t addr;
+	enum law_size size;
+	enum law_trgt_if trgt_id;
+};
+
+extern void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if id);
+extern void disable_law(u8 idx);
+extern void init_laws(void);
+
+/* define in board code */
+extern struct law_entry law_table[];
+extern int num_law_entries;
+#endif