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-rw-r--r--arch/arm/cpu/armv7/tegra20/emc.c286
1 files changed, 0 insertions, 286 deletions
diff --git a/arch/arm/cpu/armv7/tegra20/emc.c b/arch/arm/cpu/armv7/tegra20/emc.c
deleted file mode 100644
index ffc05e4..0000000
--- a/arch/arm/cpu/armv7/tegra20/emc.c
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- * Copyright (c) 2011 The Chromium OS Authors.
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-#include <common.h>
-#include <fdtdec.h>
-#include <asm/io.h>
-#include <asm/arch/ap20.h>
-#include <asm/arch/apb_misc.h>
-#include <asm/arch/clock.h>
-#include <asm/arch/emc.h>
-#include <asm/arch/tegra20.h>
-
-/*
- * The EMC registers have shadow registers. When the EMC clock is updated
- * in the clock controller, the shadow registers are copied to the active
- * registers, allowing glitchless memory bus frequency changes.
- * This function updates the shadow registers for a new clock frequency,
- * and relies on the clock lock on the emc clock to avoid races between
- * multiple frequency changes
- */
-
-/*
- * This table defines the ordering of the registers provided to
- * tegra_set_mmc()
- * TODO: Convert to fdt version once available
- */
-static const unsigned long emc_reg_addr[TEGRA_EMC_NUM_REGS] = {
- 0x2c, /* RC */
- 0x30, /* RFC */
- 0x34, /* RAS */
- 0x38, /* RP */
- 0x3c, /* R2W */
- 0x40, /* W2R */
- 0x44, /* R2P */
- 0x48, /* W2P */
- 0x4c, /* RD_RCD */
- 0x50, /* WR_RCD */
- 0x54, /* RRD */
- 0x58, /* REXT */
- 0x5c, /* WDV */
- 0x60, /* QUSE */
- 0x64, /* QRST */
- 0x68, /* QSAFE */
- 0x6c, /* RDV */
- 0x70, /* REFRESH */
- 0x74, /* BURST_REFRESH_NUM */
- 0x78, /* PDEX2WR */
- 0x7c, /* PDEX2RD */
- 0x80, /* PCHG2PDEN */
- 0x84, /* ACT2PDEN */
- 0x88, /* AR2PDEN */
- 0x8c, /* RW2PDEN */
- 0x90, /* TXSR */
- 0x94, /* TCKE */
- 0x98, /* TFAW */
- 0x9c, /* TRPAB */
- 0xa0, /* TCLKSTABLE */
- 0xa4, /* TCLKSTOP */
- 0xa8, /* TREFBW */
- 0xac, /* QUSE_EXTRA */
- 0x114, /* FBIO_CFG6 */
- 0xb0, /* ODT_WRITE */
- 0xb4, /* ODT_READ */
- 0x104, /* FBIO_CFG5 */
- 0x2bc, /* CFG_DIG_DLL */
- 0x2c0, /* DLL_XFORM_DQS */
- 0x2c4, /* DLL_XFORM_QUSE */
- 0x2e0, /* ZCAL_REF_CNT */
- 0x2e4, /* ZCAL_WAIT_CNT */
- 0x2a8, /* AUTO_CAL_INTERVAL */
- 0x2d0, /* CFG_CLKTRIM_0 */
- 0x2d4, /* CFG_CLKTRIM_1 */
- 0x2d8, /* CFG_CLKTRIM_2 */
-};
-
-struct emc_ctlr *emc_get_controller(const void *blob)
-{
- fdt_addr_t addr;
- int node;
-
- node = fdtdec_next_compatible(blob, 0, COMPAT_NVIDIA_TEGRA20_EMC);
- if (node > 0) {
- addr = fdtdec_get_addr(blob, node, "reg");
- if (addr != FDT_ADDR_T_NONE)
- return (struct emc_ctlr *)addr;
- }
- return NULL;
-}
-
-/* Error codes we use */
-enum {
- ERR_NO_EMC_NODE = -10,
- ERR_NO_EMC_REG,
- ERR_NO_FREQ,
- ERR_FREQ_NOT_FOUND,
- ERR_BAD_REGS,
- ERR_NO_RAM_CODE,
- ERR_RAM_CODE_NOT_FOUND,
-};
-
-/**
- * Find EMC tables for the given ram code.
- *
- * The tegra EMC binding has two options, one using the ram code and one not.
- * We detect which is in use by looking for the nvidia,use-ram-code property.
- * If this is not present, then the EMC tables are directly below 'node',
- * otherwise we select the correct emc-tables subnode based on the 'ram_code'
- * value.
- *
- * @param blob Device tree blob
- * @param node EMC node (nvidia,tegra20-emc compatible string)
- * @param ram_code RAM code to select (0-3, or -1 if unknown)
- * @return 0 if ok, otherwise a -ve ERR_ code (see enum above)
- */
-static int find_emc_tables(const void *blob, int node, int ram_code)
-{
- int need_ram_code;
- int depth;
- int offset;
-
- /* If we are using RAM codes, scan through the tables for our code */
- need_ram_code = fdtdec_get_bool(blob, node, "nvidia,use-ram-code");
- if (!need_ram_code)
- return node;
- if (ram_code == -1) {
- debug("%s: RAM code required but not supplied\n", __func__);
- return ERR_NO_RAM_CODE;
- }
-
- offset = node;
- depth = 0;
- do {
- /*
- * Sadly there is no compatible string so we cannot use
- * fdtdec_next_compatible_subnode().
- */
- offset = fdt_next_node(blob, offset, &depth);
- if (depth <= 0)
- break;
-
- /* Make sure this is a direct subnode */
- if (depth != 1)
- continue;
- if (strcmp("emc-tables", fdt_get_name(blob, offset, NULL)))
- continue;
-
- if (fdtdec_get_int(blob, offset, "nvidia,ram-code", -1)
- == ram_code)
- return offset;
- } while (1);
-
- debug("%s: Could not find tables for RAM code %d\n", __func__,
- ram_code);
- return ERR_RAM_CODE_NOT_FOUND;
-}
-
-/**
- * Decode the EMC node of the device tree, returning a pointer to the emc
- * controller and the table to be used for the given rate.
- *
- * @param blob Device tree blob
- * @param rate Clock speed of memory controller in Hz (=2x memory bus rate)
- * @param emcp Returns address of EMC controller registers
- * @param tablep Returns pointer to table to program into EMC. There are
- * TEGRA_EMC_NUM_REGS entries, destined for offsets as per the
- * emc_reg_addr array.
- * @return 0 if ok, otherwise a -ve error code which will allow someone to
- * figure out roughly what went wrong by looking at this code.
- */
-static int decode_emc(const void *blob, unsigned rate, struct emc_ctlr **emcp,
- const u32 **tablep)
-{
- struct apb_misc_pp_ctlr *pp =
- (struct apb_misc_pp_ctlr *)NV_PA_APB_MISC_BASE;
- int ram_code;
- int depth;
- int node;
-
- ram_code = (readl(&pp->strapping_opt_a) & RAM_CODE_MASK)
- >> RAM_CODE_SHIFT;
- /*
- * The EMC clock rate is twice the bus rate, and the bus rate is
- * measured in kHz
- */
- rate = rate / 2 / 1000;
-
- node = fdtdec_next_compatible(blob, 0, COMPAT_NVIDIA_TEGRA20_EMC);
- if (node < 0) {
- debug("%s: No EMC node found in FDT\n", __func__);
- return ERR_NO_EMC_NODE;
- }
- *emcp = (struct emc_ctlr *)fdtdec_get_addr(blob, node, "reg");
- if (*emcp == (struct emc_ctlr *)FDT_ADDR_T_NONE) {
- debug("%s: No EMC node reg property\n", __func__);
- return ERR_NO_EMC_REG;
- }
-
- /* Work out the parent node which contains our EMC tables */
- node = find_emc_tables(blob, node, ram_code & 3);
- if (node < 0)
- return node;
-
- depth = 0;
- for (;;) {
- int node_rate;
-
- node = fdtdec_next_compatible_subnode(blob, node,
- COMPAT_NVIDIA_TEGRA20_EMC_TABLE, &depth);
- if (node < 0)
- break;
- node_rate = fdtdec_get_int(blob, node, "clock-frequency", -1);
- if (node_rate == -1) {
- debug("%s: Missing clock-frequency\n", __func__);
- return ERR_NO_FREQ; /* we expect this property */
- }
-
- if (node_rate == rate)
- break;
- }
- if (node < 0) {
- debug("%s: No node found for clock frequency %d\n", __func__,
- rate);
- return ERR_FREQ_NOT_FOUND;
- }
-
- *tablep = fdtdec_locate_array(blob, node, "nvidia,emc-registers",
- TEGRA_EMC_NUM_REGS);
- if (!*tablep) {
- debug("%s: node '%s' array missing / wrong size\n", __func__,
- fdt_get_name(blob, node, NULL));
- return ERR_BAD_REGS;
- }
-
- /* All seems well */
- return 0;
-}
-
-int tegra_set_emc(const void *blob, unsigned rate)
-{
- struct emc_ctlr *emc;
- const u32 *table;
- int err, i;
-
- err = decode_emc(blob, rate, &emc, &table);
- if (err) {
- debug("Warning: no valid EMC (%d), memory timings unset\n",
- err);
- return err;
- }
-
- debug("%s: Table found, setting EMC values as follows:\n", __func__);
- for (i = 0; i < TEGRA_EMC_NUM_REGS; i++) {
- u32 value = fdt32_to_cpu(table[i]);
- u32 addr = (uintptr_t)emc + emc_reg_addr[i];
-
- debug(" %#x: %#x\n", addr, value);
- writel(value, addr);
- }
-
- /* trigger emc with new settings */
- clock_adjust_periph_pll_div(PERIPH_ID_EMC, CLOCK_ID_MEMORY,
- clock_get_rate(CLOCK_ID_MEMORY), NULL);
- debug("EMC clock set to %lu\n",
- clock_get_periph_rate(PERIPH_ID_EMC, CLOCK_ID_MEMORY));
-
- return 0;
-}
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