ARM: OMAP: Add GPMC support for OMAP2

Implement basic support for General-Purpose Memory Controller
as found on OMAP2420.

Dynamic CS address space allocation still needs to be done.

Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/include/asm-arm/arch-omap/gpmc.h b/include/asm-arm/arch-omap/gpmc.h
new file mode 100644
index 00000000000..1a0a5207822
--- /dev/null
+++ b/include/asm-arm/arch-omap/gpmc.h
@@ -0,0 +1,91 @@
+/*
+ * General-Purpose Memory Controller for OMAP2
+ *
+ * Copyright (C) 2005-2006 Nokia Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __OMAP2_GPMC_H
+#define __OMAP2_GPMC_H
+
+#define GPMC_CS_CONFIG1         0x00
+#define GPMC_CS_CONFIG2         0x04
+#define GPMC_CS_CONFIG3         0x08
+#define GPMC_CS_CONFIG4         0x0c
+#define GPMC_CS_CONFIG5         0x10
+#define GPMC_CS_CONFIG6         0x14
+#define GPMC_CS_CONFIG7         0x18
+#define GPMC_CS_NAND_COMMAND    0x1c
+#define GPMC_CS_NAND_ADDRESS    0x20
+#define GPMC_CS_NAND_DATA       0x24
+
+#define GPMC_CONFIG1_WRAPBURST_SUPP     (1 << 31)
+#define GPMC_CONFIG1_READMULTIPLE_SUPP  (1 << 20)
+#define GPMC_CONFIG1_READTYPE_ASYNC     (0 << 29)
+#define GPMC_CONFIG1_READTYPE_SYNC      (1 << 29)
+#define GPMC_CONFIG1_WRITETYPE_ASYNC    (0 << 27)
+#define GPMC_CONFIG1_WRITETYPE_SYNC     (1 << 27)
+#define GPMC_CONFIG1_CLKACTIVATIONTIME(val) ((val & 3) << 25)
+#define GPMC_CONFIG1_PAGE_LEN(val)      ((val & 3) << 23)
+#define GPMC_CONFIG1_WAIT_READ_MON      (1 << 22)
+#define GPMC_CONFIG1_WAIT_WRITE_MON     (1 << 21)
+#define GPMC_CONFIG1_WAIT_MON_IIME(val) ((val & 3) << 18)
+#define GPMC_CONFIG1_WAIT_PIN_SEL(val)  ((val & 3) << 16)
+#define GPMC_CONFIG1_DEVICESIZE(val)    ((val & 3) << 12)
+#define GPMC_CONFIG1_DEVICESIZE_16      GPMC_CONFIG1_DEVICESIZE(1)
+#define GPMC_CONFIG1_DEVICETYPE(val)    ((val & 3) << 10)
+#define GPMC_CONFIG1_DEVICETYPE_NOR     GPMC_CONFIG1_DEVICETYPE(0)
+#define GPMC_CONFIG1_DEVICETYPE_NAND    GPMC_CONFIG1_DEVICETYPE(1)
+#define GPMC_CONFIG1_MUXADDDATA         (1 << 9)
+#define GPMC_CONFIG1_TIME_PARA_GRAN     (1 << 4)
+#define GPMC_CONFIG1_FCLK_DIV(val)      (val & 3)
+#define GPMC_CONFIG1_FCLK_DIV2          (GPMC_CONFIG1_FCLK_DIV(1))
+#define GPMC_CONFIG1_FCLK_DIV3          (GPMC_CONFIG1_FCLK_DIV(2))
+#define GPMC_CONFIG1_FCLK_DIV4          (GPMC_CONFIG1_FCLK_DIV(3))
+
+/*
+ * Note that all values in this struct are in nanoseconds, while
+ * the register values are in gpmc_fck cycles.
+ */
+struct gpmc_timings {
+        /* Minimum clock period for synchronous mode */
+        u16 sync_clk;
+
+        /* Chip-select signal timings corresponding to GPMC_CS_CONFIG2 */
+        u16 cs_on;              /* Assertion time */
+        u16 cs_rd_off;          /* Read deassertion time */
+        u16 cs_wr_off;          /* Write deassertion time */
+
+        /* ADV signal timings corresponding to GPMC_CONFIG3 */
+        u16 adv_on;             /* Assertion time */
+        u16 adv_rd_off;         /* Read deassertion time */
+        u16 adv_wr_off;         /* Write deassertion time */
+
+        /* WE signals timings corresponding to GPMC_CONFIG4 */
+        u16 we_on;              /* WE assertion time */
+        u16 we_off;             /* WE deassertion time */
+
+        /* OE signals timings corresponding to GPMC_CONFIG4 */
+        u16 oe_on;              /* OE assertion time */
+        u16 oe_off;             /* OE deassertion time */
+
+        /* Access time and cycle time timings corresponding to GPMC_CONFIG5 */
+        u16 page_burst_access;  /* Multiple access word delay */
+        u16 access;             /* Start-cycle to first data valid delay */
+        u16 rd_cycle;           /* Total read cycle time */
+        u16 wr_cycle;           /* Total write cycle time */
+};
+
+extern unsigned int gpmc_ns_to_ticks(unsigned int time_ns);
+
+extern void gpmc_cs_write_reg(int cs, int idx, u32 val);
+extern u32 gpmc_cs_read_reg(int cs, int idx);
+extern int gpmc_cs_calc_divider(int cs, unsigned int sync_clk);
+extern int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t);
+extern unsigned long gpmc_cs_get_base_addr(int cs);
+
+
+#endif