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>
diff --git a/drivers/ddr/microchip/ddr2_regs.h b/drivers/ddr/microchip/ddr2_regs.h
new file mode 100644
index 0000000..0f4b159
--- /dev/null
+++ b/drivers/ddr/microchip/ddr2_regs.h
@@ -0,0 +1,148 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ */
+
+#ifndef __MICROCHIP_DDR2_REGS_H
+#define __MICROCHIP_DDR2_REGS_H
+
+#include <linux/bitops.h>
+
+/* DDR2 Controller */
+struct ddr2_ctrl_regs {
+ u32 tsel;
+ u32 minlim;
+ u32 reqprd;
+ u32 mincmd;
+ u32 memcon;
+ u32 memcfg0;
+ u32 memcfg1;
+ u32 memcfg2;
+ u32 memcfg3;
+ u32 memcfg4;
+ u32 refcfg;
+ u32 pwrcfg;
+ u32 dlycfg0;
+ u32 dlycfg1;
+ u32 dlycfg2;
+ u32 dlycfg3;
+ u32 odtcfg;
+ u32 xfercfg;
+ u32 cmdissue;
+ u32 odtencfg;
+ u32 memwidth;
+ u32 unused[11];
+ u32 cmd10[16];
+ u32 cmd20[16];
+};
+
+/* Arbiter Config */
+#define MIN_LIM_WIDTH 5
+#define RQST_PERIOD_WIDTH 8
+#define MIN_CMDACPT_WIDTH 8
+
+/* Refresh Config */
+#define REFCNT_CLK(x) (x)
+#define REFDLY_CLK(x) ((x) << 16)
+#define MAX_PEND_REF(x) ((x) << 24)
+
+/* Power Config */
+#define PRECH_PWR_DN_ONLY(x) ((x) << 22)
+#define SELF_REF_DLY(x) ((x) << 12)
+#define PWR_DN_DLY(x) ((x) << 4)
+#define EN_AUTO_SELF_REF(x) ((x) << 3)
+#define EN_AUTO_PWR_DN(x) ((x) << 2)
+#define ERR_CORR_EN(x) ((x) << 1)
+#define ECC_EN(x) (x)
+
+/* Memory Width */
+#define HALF_RATE_MODE BIT(3)
+
+/* Delay Config */
+#define ODTWLEN(x) ((x) << 20)
+#define ODTRLEN(x) ((x) << 16)
+#define ODTWDLY(x) ((x) << 12)
+#define ODTRDLY(x) ((x) << 8)
+
+/* Xfer Config */
+#define BIG_ENDIAN(x) ((x) << 31)
+#define MAX_BURST(x) ((x) << 24)
+#define RDATENDLY(x) ((x) << 16)
+#define NXDATAVDLY(x) ((x) << 4)
+#define NXTDATRQDLY(x) ((x) << 0)
+
+/* Host Commands */
+#define IDLE_NOP 0x00ffffff
+#define PRECH_ALL_CMD 0x00fff401
+#define REF_CMD 0x00fff801
+#define LOAD_MODE_CMD 0x00fff001
+#define CKE_LOW 0x00ffeffe
+
+#define NUM_HOST_CMDS 12
+
+/* Host CMD Issue */
+#define CMD_VALID BIT(4)
+#define NUMHOSTCMD(x) (x)
+
+/* Memory Control */
+#define INIT_DONE BIT(1)
+#define INIT_START BIT(0)
+
+/* Address Control */
+#define EN_AUTO_PRECH 0
+#define SB_PRI 1
+
+/* DDR2 Phy Register */
+struct ddr2_phy_regs {
+ u32 scl_start;
+ u32 unused1[2];
+ u32 scl_latency;
+ u32 unused2[2];
+ u32 scl_config_1;
+ u32 scl_config_2;
+ u32 pad_ctrl;
+ u32 dll_recalib;
+};
+
+/* PHY PAD CONTROL */
+#define ODT_SEL BIT(0)
+#define ODT_EN BIT(1)
+#define DRIVE_SEL(x) ((x) << 2)
+#define ODT_PULLDOWN(x) ((x) << 4)
+#define ODT_PULLUP(x) ((x) << 6)
+#define EXTRA_OEN_CLK(x) ((x) << 8)
+#define NOEXT_DLL BIT(9)
+#define DLR_DFT_WRCMD BIT(13)
+#define HALF_RATE BIT(14)
+#define DRVSTR_PFET(x) ((x) << 16)
+#define DRVSTR_NFET(x) ((x) << 20)
+#define RCVR_EN BIT(28)
+#define PREAMBLE_DLY(x) ((x) << 29)
+
+/* PHY DLL RECALIBRATE */
+#define RECALIB_CNT(x) ((x) << 8)
+#define DISABLE_RECALIB(x) ((x) << 26)
+#define DELAY_START_VAL(x) ((x) << 28)
+
+/* PHY SCL CONFIG1 */
+#define SCL_BURST8 BIT(0)
+#define SCL_DDR_CONNECTED BIT(1)
+#define SCL_RCAS_LAT(x) ((x) << 4)
+#define SCL_ODTCSWW BIT(24)
+
+/* PHY SCL CONFIG2 */
+#define SCL_CSEN BIT(0)
+#define SCL_WCAS_LAT(x) ((x) << 8)
+
+/* PHY SCL Latency */
+#define SCL_CAPCLKDLY(x) ((x) << 0)
+#define SCL_DDRCLKDLY(x) ((x) << 4)
+
+/* PHY SCL START */
+#define SCL_START BIT(28)
+#define SCL_EN BIT(26)
+#define SCL_LUBPASS (BIT(1) | BIT(0))
+
+#endif /* __MICROCHIP_DDR2_REGS_H */