summaryrefslogtreecommitdiff
path: root/arch/mips
diff options
context:
space:
mode:
authorPurna Chandra Mandal <purna.mandal@microchip.com>2016-01-28 15:30:15 +0530
committerDaniel Schwierzeck <daniel.schwierzeck@gmail.com>2016-02-01 22:14:01 +0100
commit9ffa7a35ef940b27813c11f68eb28a6b82696915 (patch)
tree03fc3202d548ccedf138e33f61efb478db7eaf80 /arch/mips
parent9e160ee823b44e0a63bc469d42d7d9fcab54b60b (diff)
downloadu-boot-imx-9ffa7a35ef940b27813c11f68eb28a6b82696915.zip
u-boot-imx-9ffa7a35ef940b27813c11f68eb28a6b82696915.tar.gz
u-boot-imx-9ffa7a35ef940b27813c11f68eb28a6b82696915.tar.bz2
drivers: ddr: Add DDR2 SDRAM controller driver for Microchip PIC32.
This driver initializes PIC32 DDR2 SDRAM controller and internal DDR2 Phy module. DDR2 controller operates in half-rate mode (upto 533MHZ frequency). Signed-off-by: Paul Thacker <paul.thacker@microchip.com> Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/mach-pic32/include/mach/ddr.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/mips/mach-pic32/include/mach/ddr.h b/arch/mips/mach-pic32/include/mach/ddr.h
new file mode 100644
index 0000000..00abfa3
--- /dev/null
+++ b/arch/mips/mach-pic32/include/mach/ddr.h
@@ -0,0 +1,32 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ */
+
+#ifndef __MICROCHIP_PIC32_DDR_H
+#define __MICROCHIP_PIC32_DDR_H
+
+/* called by initdram() function */
+void ddr2_phy_init(void);
+void ddr2_ctrl_init(void);
+phys_size_t ddr2_calculate_size(void);
+
+/* Maximum number of agents */
+#define NUM_AGENTS 5
+
+/* Board can provide agent specific parameters for arbitration by
+ * filling struct ddr2_arbiter_params for all the agents and
+ * implementing board_get_ddr_arbiter_params() to return the filled
+ * structure.
+ */
+struct ddr2_arbiter_params {
+ u32 min_limit; /* min bursts to execute per arbitration */
+ u32 req_period; /* request period threshold for accepted cmds */
+ u32 min_cmd_acpt; /* min number of accepted cmds */
+};
+
+const struct ddr2_arbiter_params *board_get_ddr_arbiter_params(void);
+
+#endif /* __MICROCHIP_PIC32_DDR_H */