--- /dev/null
+/*
+ * linux/arch/arm/mach-omap2/sdrc2xxx.c
+ *
+ * SDRAM timing related functions for OMAP2xxx
+ *
+ * Copyright (C) 2005, 2008 Texas Instruments Inc.
+ * Copyright (C) 2005, 2008 Nokia Corporation
+ *
+ * Tony Lindgren <tony@atomide.com>
+ * Paul Walmsley
+ * Richard Woodruff <r-woodruff2@ti.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/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include "soc.h"
+#include "iomap.h"
+#include "common.h"
+#include "prm2xxx.h"
+#include "clock.h"
+#include "sdrc.h"
+#include "sram.h"
+
+/* Memory timing, DLL mode flags */
+#define M_DDR 1
+#define M_LOCK_CTRL (1 << 2)
+#define M_UNLOCK 0
+#define M_LOCK 1
+
+
+static struct memory_timings mem_timings;
+static u32 curr_perf_level = CORE_CLK_SRC_DPLL_X2;
+
+static u32 omap2xxx_sdrc_get_slow_dll_ctrl(void)
+{
+ return mem_timings.slow_dll_ctrl;
+}
+
+static u32 omap2xxx_sdrc_get_fast_dll_ctrl(void)
+{
+ return mem_timings.fast_dll_ctrl;
+}
+
+static u32 omap2xxx_sdrc_get_type(void)
+{
+ return mem_timings.m_type;
+}
+
+/*
+ * Check the DLL lock state, and return tue if running in unlock mode.
+ * This is needed to compensate for the shifted DLL value in unlock mode.
+ */
+u32 omap2xxx_sdrc_dll_is_unlocked(void)
+{
+ /* dlla and dllb are a set */
+ u32 dll_state = sdrc_read_reg(SDRC_DLLA_CTRL);
+
+ if ((dll_state & (1 << 2)) == (1 << 2))
+ return 1;
+ else
+ return 0;
+}
+
+/*
+ * 'level' is the value to store to CM_CLKSEL2_PLL.CORE_CLK_SRC.
+ * Practical values are CORE_CLK_SRC_DPLL (for CORE_CLK = DPLL_CLK) or
+ * CORE_CLK_SRC_DPLL_X2 (for CORE_CLK = * DPLL_CLK * 2)
+ *
+ * Used by the clock framework during CORE DPLL changes
+ */
+u32 omap2xxx_sdrc_reprogram(u32 level, u32 force)
+{
+ u32 dll_ctrl, m_type;
+ u32 prev = curr_perf_level;
+ unsigned long flags;
+
+ if ((curr_perf_level == level) && !force)
+ return prev;
+
+ if (level == CORE_CLK_SRC_DPLL)
+ dll_ctrl = omap2xxx_sdrc_get_slow_dll_ctrl();
+ else if (level == CORE_CLK_SRC_DPLL_X2)
+ dll_ctrl = omap2xxx_sdrc_get_fast_dll_ctrl();
+ else
+ return prev;
+
+ m_type = omap2xxx_sdrc_get_type();
+
+ local_irq_save(flags);
+ /*
+ * XXX These calls should be abstracted out through a
+ * prm2xxx.c function
+ */
+ if (cpu_is_omap2420())
+ writel_relaxed(0xffff, OMAP2420_PRCM_VOLTSETUP);
+ else
+ writel_relaxed(0xffff, OMAP2430_PRCM_VOLTSETUP);
+ omap2_sram_reprogram_sdrc(level, dll_ctrl, m_type);
+ curr_perf_level = level;
+ local_irq_restore(flags);
+
+ return prev;
+}
+
+/* Used by the clock framework during CORE DPLL changes */
+void omap2xxx_sdrc_init_params(u32 force_lock_to_unlock_mode)
+{
+ unsigned long dll_cnt;
+ u32 fast_dll = 0;
+
+ /* DDR = 1, SDR = 0 */
+ mem_timings.m_type = !((sdrc_read_reg(SDRC_MR_0) & 0x3) == 0x1);
+
+ /* 2422 es2.05 and beyond has a single SIP DDR instead of 2 like others.
+ * In the case of 2422, its ok to use CS1 instead of CS0.
+ */
+ if (cpu_is_omap2422())
+ mem_timings.base_cs = 1;
+ else
+ mem_timings.base_cs = 0;
+
+ if (mem_timings.m_type != M_DDR)
+ return;
+
+ /* With DDR we need to determine the low frequency DLL value */
+ if (((mem_timings.fast_dll_ctrl & (1 << 2)) == M_LOCK_CTRL))
+ mem_timings.dll_mode = M_UNLOCK;
+ else
+ mem_timings.dll_mode = M_LOCK;
+
+ if (mem_timings.base_cs == 0) {
+ fast_dll = sdrc_read_reg(SDRC_DLLA_CTRL);
+ dll_cnt = sdrc_read_reg(SDRC_DLLA_STATUS) & 0xff00;
+ } else {
+ fast_dll = sdrc_read_reg(SDRC_DLLB_CTRL);
+ dll_cnt = sdrc_read_reg(SDRC_DLLB_STATUS) & 0xff00;
+ }
+ if (force_lock_to_unlock_mode) {
+ fast_dll &= ~0xff00;
+ fast_dll |= dll_cnt; /* Current lock mode */
+ }
+ /* set fast timings with DLL filter disabled */
+ mem_timings.fast_dll_ctrl = (fast_dll | (3 << 8));
+
+ /* No disruptions, DDR will be offline & C-ABI not followed */
+ omap2_sram_ddr_init(&mem_timings.slow_dll_ctrl,
+ mem_timings.fast_dll_ctrl,
+ mem_timings.base_cs,
+ force_lock_to_unlock_mode);
+ mem_timings.slow_dll_ctrl &= 0xff00; /* Keep lock value */
+
+ /* Turn status into unlock ctrl */
+ mem_timings.slow_dll_ctrl |=
+ ((mem_timings.fast_dll_ctrl & 0xF) | (1 << 2));
+
+ /* 90 degree phase for anything below 133Mhz + disable DLL filter */
+ mem_timings.slow_dll_ctrl |= ((1 << 1) | (3 << 8));
+}
Code Review / kvmfornfv.git / blobdiff