This adds a function which reads back the SDRAM controller settings.
This is used in a AM33xx specific barebox entry function and a
SDRAM driver which registers a SDRAM memory bank.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/mach-omap/Makefile | 1 +
arch/arm/mach-omap/am33xx_generic.c | 56 ++++++++++++++++++++++++
arch/arm/mach-omap/am33xx_scrm.c | 51 +++++++++++++++++++++
arch/arm/mach-omap/include/mach/am33xx-silicon.h | 2 +
4 files changed, 110 insertions(+)
create mode 100644 arch/arm/mach-omap/am33xx_scrm.c
diff --git a/arch/arm/mach-omap/Makefile b/arch/arm/mach-omap/Makefile
index c9b6f4b..0ebfae7 100644
--- a/arch/arm/mach-omap/Makefile
+++ b/arch/arm/mach-omap/Makefile
@@ -24,6 +24,7 @@ pbl-$(CONFIG_ARCH_OMAP3) += omap3_generic.o auxcr.o
obj-$(CONFIG_ARCH_OMAP4) += omap4_generic.o omap4_clock.o
pbl-$(CONFIG_ARCH_OMAP4) += omap4_generic.o omap4_clock.o
obj-pbl-$(CONFIG_ARCH_AM33XX) += am33xx_generic.o am33xx_clock.o am33xx_mux.o
+obj-$(CONFIG_ARCH_AM33XX) += am33xx_scrm.o
obj-$(CONFIG_OMAP3_CLOCK_CONFIG) += omap3_clock.o
pbl-$(CONFIG_OMAP3_CLOCK_CONFIG) += omap3_clock.o
obj-$(CONFIG_OMAP_GPMC) += gpmc.o devices-gpmc-nand.o
diff --git a/arch/arm/mach-omap/am33xx_generic.c b/arch/arm/mach-omap/am33xx_generic.c
index 606e391..71c528c 100644
--- a/arch/arm/mach-omap/am33xx_generic.c
+++ b/arch/arm/mach-omap/am33xx_generic.c
@@ -19,6 +19,7 @@
#include <init.h>
#include <io.h>
#include <net.h>
+#include <asm/barebox-arm.h>
#include <mach/am33xx-silicon.h>
#include <mach/am33xx-clock.h>
#include <mach/generic.h>
@@ -318,6 +319,61 @@ void am33xx_config_sdram(const struct am33xx_emif_regs *regs)
writel(regs->sdram_config, AM33XX_EMIF4_0_REG(SDRAM_CONFIG));
}
+/**
+ * am335x_sdram_size - read back SDRAM size from sdram_config register
+ *
+ * @return: The SDRAM size
+ */
+unsigned long am335x_sdram_size(void)
+{
+ int rows, cols, width, banks;
+ unsigned long size;
+ uint32_t sdram_config = readl(CM_EMIF_SDRAM_CONFIG);
+
+ rows = ((sdram_config >> 7) & 0x7) + 9;
+ cols = (sdram_config & 0x7) + 8;
+
+ switch ((sdram_config >> 14) & 0x3) {
+ case 0:
+ width = 4;
+ break;
+ case 1:
+ width = 2;
+ break;
+ default:
+ return 0;
+ }
+
+ switch ((sdram_config >> 4) & 0x7) {
+ case 0:
+ banks = 1;
+ break;
+ case 1:
+ banks = 2;
+ break;
+ case 2:
+ banks = 4;
+ break;
+ case 3:
+ banks = 8;
+ break;
+ default:
+ return 0;
+ }
+
+ size = (1 << rows) * (1 << cols) * banks * width;
+
+ debug("%s: sdram_config: 0x%08x cols: %2d rows: %2d width: %2d banks: %2d size: 0x%08lx\n",
+ __func__, sdram_config, cols, rows, width, banks, size);
+
+ return size;
+}
+
+void __noreturn am335x_barebox_entry(void *boarddata)
+{
+ barebox_arm_entry(0x80000000, am335x_sdram_size(), boarddata);
+}
+
void am33xx_config_io_ctrl(int ioctrl)
{
writel(ioctrl, AM33XX_DDR_CMD0_IOCTRL);
diff --git a/arch/arm/mach-omap/am33xx_scrm.c b/arch/arm/mach-omap/am33xx_scrm.c
new file mode 100644
index 0000000..67529f8
--- /dev/null
+++ b/arch/arm/mach-omap/am33xx_scrm.c
@@ -0,0 +1,51 @@
+/*
+ * (C) Copyright 2014 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ */
+#include <common.h>
+#include <io.h>
+#include <errno.h>
+#include <sizes.h>
+#include <init.h>
+#include <of.h>
+#include <asm/barebox-arm.h>
+#include <asm/memory.h>
+#include <mach/am33xx-silicon.h>
+
+static int am33xx_scrm_probe(struct device_d *dev)
+{
+ arm_add_mem_device("ram0", 0x80000000, am335x_sdram_size());
+
+ return 0;
+}
+
+static __maybe_unused struct of_device_id am33xx_scrm_dt_ids[] = {
+ {
+ .compatible = "ti,am3-scrm",
+ }, {
+ /* sentinel */
+ }
+};
+
+static struct driver_d am33xx_scrm_driver = {
+ .name = "am33xx-scrm",
+ .probe = am33xx_scrm_probe,
+ .of_compatible = DRV_OF_COMPAT(am33xx_scrm_dt_ids),
+};
+
+static int am33xx_scrm_init(void)
+{
+ return platform_driver_register(&am33xx_scrm_driver);
+}
+
+mem_initcall(am33xx_scrm_init);
diff --git a/arch/arm/mach-omap/include/mach/am33xx-silicon.h b/arch/arm/mach-omap/include/mach/am33xx-silicon.h
index 20b8e81..ceca10a 100644
--- a/arch/arm/mach-omap/include/mach/am33xx-silicon.h
+++ b/arch/arm/mach-omap/include/mach/am33xx-silicon.h
@@ -237,5 +237,7 @@ void am33xx_config_ddr_data(const struct am33xx_ddr_data *data, int macronr);
void am335x_sdram_init(int ioctrl, const struct am33xx_cmd_control *cmd_ctrl,
const struct am33xx_emif_regs *emif_regs,
const struct am33xx_ddr_data *ddr_data);
+unsigned long am335x_sdram_size(void);
+void am335x_barebox_entry(void *boarddata);
#endif
--
2.0.1
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