arm: omap: rename board-rx51-sdram.c to sdram-nokia.c

Rename the file and functions so that it can be reused by future Nokia
boards. Based on patches by Juha Keski-Saari.

Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 221 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/sdram-nokia.c b/arch/arm/mach-omap2/sdram-nokia.c
new file mode 100644
index 000000000000..690202b996c1
--- /dev/null
+++ b/arch/arm/mach-omap2/sdram-nokia.c
@@ -0,0 +1,221 @@
+/*
+ * SDRC register values for Nokia boards
+ *
+ * Copyright (C) 2008, 2010 Nokia Corporation
+ *
+ * Lauri Leukkunen <lauri.leukkunen@nokia.com>
+ *
+ * Original code by Juha Yrjola <juha.yrjola@solidboot.com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <plat/io.h>
+#include <plat/common.h>
+#include <plat/clock.h>
+#include <plat/sdrc.h>
+
+
+/* In picoseconds, except for tREF (ns), tXP, tCKE, tWTR (clks) */
+struct sdram_timings {
+        u32 casl;
+        u32 tDAL;
+        u32 tDPL;
+        u32 tRRD;
+        u32 tRCD;
+        u32 tRP;
+        u32 tRAS;
+        u32 tRC;
+        u32 tRFC;
+        u32 tXSR;
+
+        u32 tREF; /* in ns */
+
+        u32 tXP;
+        u32 tCKE;
+        u32 tWTR;
+};
+
+static struct omap_sdrc_params nokia_sdrc_params[4];
+
+static const struct sdram_timings memory_timings[] = {
+        {
+                .casl = 3,
+                .tDAL = 33000,
+                .tDPL = 15000,
+                .tRRD = 12000,
+                .tRCD = 22500,
+                .tRP = 18000,
+                .tRAS = 42000,
+                .tRC = 66000,
+                .tRFC = 138000,
+                .tXSR = 200000,
+
+                .tREF = 7800,
+
+                .tXP = 2,
+                .tCKE = 2,
+                .tWTR = 2
+        },
+};
+
+static unsigned long sdrc_get_fclk_period(long rate)
+{
+        /* In picoseconds */
+        return 1000000000 / rate;
+}
+
+static unsigned int sdrc_ps_to_ticks(unsigned int time_ps, long rate)
+{
+        unsigned long tick_ps;
+
+        /* Calculate in picosecs to yield more exact results */
+        tick_ps = sdrc_get_fclk_period(rate);
+
+        return (time_ps + tick_ps - 1) / tick_ps;
+}
+#undef DEBUG
+#ifdef DEBUG
+static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit,
+                                int ticks, long rate, const char *name)
+#else
+static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit,
+                               int ticks)
+#endif
+{
+        int mask, nr_bits;
+
+        nr_bits = end_bit - st_bit + 1;
+        if (ticks >= 1 << nr_bits)
+                return -1;
+        mask = (1 << nr_bits) - 1;
+        *regval &= ~(mask << st_bit);
+        *regval |= ticks << st_bit;
+#ifdef DEBUG
+        printk(KERN_INFO "SDRC %s: %i ticks %i ns\n", name, ticks,
+                        (unsigned int)sdrc_get_fclk_period(rate) * ticks /
+                        1000);
+#endif
+
+        return 0;
+}
+
+#ifdef DEBUG
+#define SDRC_SET_ONE(reg, st, end, field, rate) \
+        if (set_sdrc_timing_regval((reg), (st), (end), \
+                        memory_timings->field, (rate), #field) < 0) \
+                err = -1;
+#else
+#define SDRC_SET_ONE(reg, st, end, field, rate) \
+        if (set_sdrc_timing_regval((reg), (st), (end), \
+                        memory_timings->field) < 0) \
+                err = -1;
+#endif
+
+#ifdef DEBUG
+static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit,
+                                int time, long rate, const char *name)
+#else
+static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit,
+                                int time, long rate)
+#endif
+{
+        int ticks, ret;
+        ret = 0;
+
+        if (time == 0)
+                ticks = 0;
+        else
+                ticks = sdrc_ps_to_ticks(time, rate);
+
+#ifdef DEBUG
+        ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks,
+                                     rate, name);
+#else
+        ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks);
+#endif
+
+        return ret;
+}
+
+#ifdef DEBUG
+#define SDRC_SET_ONE_PS(reg, st, end, field, rate) \
+        if (set_sdrc_timing_regval_ps((reg), (st), (end), \
+                        memory_timings->field, \
+                        (rate), #field) < 0) \
+                err = -1;
+
+#else
+#define SDRC_SET_ONE_PS(reg, st, end, field, rate) \
+        if (set_sdrc_timing_regval_ps((reg), (st), (end), \
+                        memory_timings->field, (rate)) < 0) \
+                err = -1;
+#endif
+
+static int sdrc_timings(int id, long rate)
+{
+        u32 ticks_per_ms;
+        u32 rfr, l;
+        u32 actim_ctrla = 0, actim_ctrlb = 0;
+        u32 rfr_ctrl;
+        int err = 0;
+        long l3_rate = rate / 1000;
+
+        SDRC_SET_ONE_PS(&actim_ctrla,  0,  4, tDAL, l3_rate);
+        SDRC_SET_ONE_PS(&actim_ctrla,  6,  8, tDPL, l3_rate);
+        SDRC_SET_ONE_PS(&actim_ctrla,  9, 11, tRRD, l3_rate);
+        SDRC_SET_ONE_PS(&actim_ctrla, 12, 14, tRCD, l3_rate);
+        SDRC_SET_ONE_PS(&actim_ctrla, 15, 17, tRP, l3_rate);
+        SDRC_SET_ONE_PS(&actim_ctrla, 18, 21, tRAS, l3_rate);
+        SDRC_SET_ONE_PS(&actim_ctrla, 22, 26, tRC, l3_rate);
+        SDRC_SET_ONE_PS(&actim_ctrla, 27, 31, tRFC, l3_rate);
+
+        SDRC_SET_ONE_PS(&actim_ctrlb,  0,  7, tXSR, l3_rate);
+
+        SDRC_SET_ONE(&actim_ctrlb,  8, 10, tXP, l3_rate);
+        SDRC_SET_ONE(&actim_ctrlb, 12, 14, tCKE, l3_rate);
+        SDRC_SET_ONE(&actim_ctrlb, 16, 17, tWTR, l3_rate);
+
+        ticks_per_ms = l3_rate;
+        rfr = memory_timings[0].tREF * ticks_per_ms / 1000000;
+        if (rfr > 65535 + 50)
+                rfr = 65535;
+        else
+                rfr -= 50;
+
+#ifdef DEBUG
+        printk(KERN_INFO "SDRC tREF: %i ticks\n", rfr);
+#endif
+
+        l = rfr << 8;
+        rfr_ctrl = l | 0x1; /* autorefresh, reload counter with 1xARCV */
+
+        nokia_sdrc_params[id].rate = rate;
+        nokia_sdrc_params[id].actim_ctrla = actim_ctrla;
+        nokia_sdrc_params[id].actim_ctrlb = actim_ctrlb;
+        nokia_sdrc_params[id].rfr_ctrl = rfr_ctrl;
+        nokia_sdrc_params[id].mr = 0x32;
+
+        nokia_sdrc_params[id + 1].rate = 0;
+
+        return err;
+}
+
+struct omap_sdrc_params *nokia_get_sdram_timings(void)
+{
+        int err;
+
+        err = sdrc_timings(0, 41500000);
+        err |= sdrc_timings(1, 83000000);
+        err |= sdrc_timings(2, 166000000);
+
+        return &nokia_sdrc_params[0];
+}
+