--- /dev/null
+/*
+ * Functions related to OMAP3 SDRC.
+ *
+ * This file has been created after exctracting and consolidating
+ * the SDRC related content from mem.c and board.c, also created
+ * generic init function (mem_init).
+ *
+ * Copyright (C) 2004-2010
+ * Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Copyright (C) 2011
+ * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
+ *
+ * Author :
+ * Vaibhav Hiremath <hvaibhav@ti.com>
+ *
+ * Original implementation by (mem.c, board.c) :
+ * Sunil Kumar <sunilsaini05@gmail.com>
+ * Shashi Ranjan <shashiranjanmca05@gmail.com>
+ * Manikandan Pillai <mani.pillai@ti.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/mem.h>
+#include <asm/arch/sys_proto.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+extern omap3_sysinfo sysinfo;
+
+static struct sdrc *sdrc_base = (struct sdrc *)OMAP34XX_SDRC_BASE;
+
+/*
+ * is_mem_sdr -
+ * - Return 1 if mem type in use is SDR
+ */
+u32 is_mem_sdr(void)
+{
+ if (readl(&sdrc_base->cs[CS0].mr) == SDRC_MR_0_SDR)
+ return 1;
+ return 0;
+}
+
+/*
+ * make_cs1_contiguous -
+ * - When we have CS1 populated we want to have it mapped after cs0 to allow
+ * command line mem=xyz use all memory with out discontinuous support
+ * compiled in. We could do it in the ATAG, but there really is two banks...
+ */
+void make_cs1_contiguous(void)
+{
+ u32 size, a_add_low, a_add_high;
+
+ size = get_sdr_cs_size(CS0);
+ size >>= 25; /* divide by 32 MiB to find size to offset CS1 */
+ a_add_high = (size & 3) << 8; /* set up low field */
+ a_add_low = (size & 0x3C) >> 2; /* set up high field */
+ writel((a_add_high | a_add_low), &sdrc_base->cs_cfg);
+
+}
+
+
+/*
+ * get_sdr_cs_size -
+ * - Get size of chip select 0/1
+ */
+u32 get_sdr_cs_size(u32 cs)
+{
+ u32 size;
+
+ /* get ram size field */
+ size = readl(&sdrc_base->cs[cs].mcfg) >> 8;
+ size &= 0x3FF; /* remove unwanted bits */
+ size <<= 21; /* multiply by 2 MiB to find size in MB */
+ return size;
+}
+
+/*
+ * get_sdr_cs_offset -
+ * - Get offset of cs from cs0 start
+ */
+u32 get_sdr_cs_offset(u32 cs)
+{
+ u32 offset;
+
+ if (!cs)
+ return 0;
+
+ offset = readl(&sdrc_base->cs_cfg);
+ offset = (offset & 15) << 27 | (offset & 0x300) << 17;
+
+ return offset;
+}
+
+/*
+ * write_sdrc_timings -
+ * - Takes CS and associated timings and initalize SDRAM
+ * - Test CS to make sure it's OK for use
+ */
+static void write_sdrc_timings(u32 cs, struct sdrc_actim *sdrc_actim_base,
+ struct board_sdrc_timings *timings)
+{
+ /* Setup timings we got from the board. */
+ writel(timings->mcfg, &sdrc_base->cs[cs].mcfg);
+ writel(timings->ctrla, &sdrc_actim_base->ctrla);
+ writel(timings->ctrlb, &sdrc_actim_base->ctrlb);
+ writel(timings->rfr_ctrl, &sdrc_base->cs[cs].rfr_ctrl);
+ writel(CMD_NOP, &sdrc_base->cs[cs].manual);
+ writel(CMD_PRECHARGE, &sdrc_base->cs[cs].manual);
+ writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual);
+ writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual);
+ writel(timings->mr, &sdrc_base->cs[cs].mr);
+
+ /*
+ * Test ram in this bank
+ * Disable if bad or not present
+ */
+ if (!mem_ok(cs))
+ writel(0, &sdrc_base->cs[cs].mcfg);
+}
+
+/*
+ * do_sdrc_init -
+ * - Code called once in C-Stack only context for CS0 and with early being
+ * true and a possible 2nd time depending on memory configuration from
+ * stack+global context.
+ */
+void do_sdrc_init(u32 cs, u32 early)
+{
+ struct sdrc_actim *sdrc_actim_base0, *sdrc_actim_base1;
+ struct board_sdrc_timings timings;
+
+ sdrc_actim_base0 = (struct sdrc_actim *)SDRC_ACTIM_CTRL0_BASE;
+ sdrc_actim_base1 = (struct sdrc_actim *)SDRC_ACTIM_CTRL1_BASE;
+
+ /*
+ * When called in the early context this may be SPL and we will
+ * need to set all of the timings. This ends up being board
+ * specific so we call a helper function to take care of this
+ * for us. Otherwise, to be safe, we need to copy the settings
+ * from the first bank to the second. We will setup CS0,
+ * then set cs_cfg to the appropriate value then try and
+ * setup CS1.
+ */
+#ifdef CONFIG_SPL_BUILD
+ get_board_mem_timings(&timings);
+#endif
+ if (early) {
+ /* reset sdrc controller */
+ writel(SOFTRESET, &sdrc_base->sysconfig);
+ wait_on_value(RESETDONE, RESETDONE, &sdrc_base->status,
+ 12000000);
+ writel(0, &sdrc_base->sysconfig);
+
+ /* setup sdrc to ball mux */
+ writel(SDRC_SHARING, &sdrc_base->sharing);
+
+ /* Disable Power Down of CKE because of 1 CKE on combo part */
+ writel(WAKEUPPROC | SRFRONRESET | PAGEPOLICY_HIGH,
+ &sdrc_base->power);
+
+ writel(ENADLL | DLLPHASE_90, &sdrc_base->dlla_ctrl);
+ sdelay(0x20000);
+#ifdef CONFIG_SPL_BUILD
+ write_sdrc_timings(CS0, sdrc_actim_base0, &timings);
+ make_cs1_contiguous();
+ write_sdrc_timings(CS1, sdrc_actim_base1, &timings);
+#endif
+
+ }
+
+ /*
+ * If we aren't using SPL we have been loaded by some
+ * other means which may not have correctly initialized
+ * both CS0 and CS1 (such as some older versions of x-loader)
+ * so we may be asked now to setup CS1.
+ */
+ if (cs == CS1) {
+ timings.mcfg = readl(&sdrc_base->cs[CS0].mcfg),
+ timings.rfr_ctrl = readl(&sdrc_base->cs[CS0].rfr_ctrl);
+ timings.ctrla = readl(&sdrc_actim_base0->ctrla);
+ timings.ctrlb = readl(&sdrc_actim_base0->ctrlb);
+ timings.mr = readl(&sdrc_base->cs[CS0].mr);
+ write_sdrc_timings(cs, sdrc_actim_base1, &timings);
+ }
+}
+
+/*
+ * dram_init -
+ * - Sets uboots idea of sdram size
+ */
+int dram_init(void)
+{
+ unsigned int size0 = 0, size1 = 0;
+
+ size0 = get_sdr_cs_size(CS0);
+ /*
+ * We always need to have cs_cfg point at where the second
+ * bank would be, if present. Failure to do so can lead to
+ * strange situations where memory isn't detected and
+ * configured correctly. CS0 will already have been setup
+ * at this point.
+ */
+ make_cs1_contiguous();
+ do_sdrc_init(CS1, NOT_EARLY);
+ size1 = get_sdr_cs_size(CS1);
+
+ gd->ram_size = size0 + size1;
+
+ return 0;
+}
+
+void dram_init_banksize (void)
+{
+ unsigned int size0 = 0, size1 = 0;
+
+ size0 = get_sdr_cs_size(CS0);
+ size1 = get_sdr_cs_size(CS1);
+
+ gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
+ gd->bd->bi_dram[0].size = size0;
+ gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
+ gd->bd->bi_dram[1].size = size1;
+}
+
+/*
+ * mem_init -
+ * - Init the sdrc chip,
+ * - Selects CS0 and CS1,
+ */
+void mem_init(void)
+{
+ /* only init up first bank here */
+ do_sdrc_init(CS0, EARLY_INIT);
+}
Code Review / kvmfornfv.git / blobdiff