From: Jimmy Zhang jimmzhang@nvidia.com
Add support for setting up the memory controller parameters. Boards can set up an appropriate table in the device tree.
Signed-off-by: Simon Glass sjg@chromium.org --- Changes in v2: - Add debug() output to EMC - Move EMC tables to device tree
Changes in v3: - Support nvidia,use-ram-code binding option for EMC - Try to return a useful error code when EMC config fails
arch/arm/cpu/armv7/tegra2/Makefile | 1 + arch/arm/cpu/armv7/tegra2/emc.c | 286 ++++++++++++++++++++++++++++++++ arch/arm/include/asm/arch-tegra2/emc.h | 113 +++++++++++++ include/fdtdec.h | 2 + lib/fdtdec.c | 2 + 5 files changed, 404 insertions(+), 0 deletions(-) create mode 100644 arch/arm/cpu/armv7/tegra2/emc.c create mode 100644 arch/arm/include/asm/arch-tegra2/emc.h
diff --git a/arch/arm/cpu/armv7/tegra2/Makefile b/arch/arm/cpu/armv7/tegra2/Makefile index e9ac6c9..dcd6329 100644 --- a/arch/arm/cpu/armv7/tegra2/Makefile +++ b/arch/arm/cpu/armv7/tegra2/Makefile @@ -34,6 +34,7 @@ LIB = $(obj)lib$(SOC).o
SOBJS := lowlevel_init.o COBJS-y := ap20.o board.o clock.o funcmux.o pinmux.o sys_info.o timer.o +COBJS-$(CONFIG_TEGRA_CLOCK_SCALING) += emc.o COBJS-$(CONFIG_USB_EHCI_TEGRA) += usb.o
COBJS := $(COBJS-y) diff --git a/arch/arm/cpu/armv7/tegra2/emc.c b/arch/arm/cpu/armv7/tegra2/emc.c new file mode 100644 index 0000000..c0e5c56 --- /dev/null +++ b/arch/arm/cpu/armv7/tegra2/emc.c @@ -0,0 +1,286 @@ +/* + * 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/tegra2.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; +} diff --git a/arch/arm/include/asm/arch-tegra2/emc.h b/arch/arm/include/asm/arch-tegra2/emc.h new file mode 100644 index 0000000..deb3d36 --- /dev/null +++ b/arch/arm/include/asm/arch-tegra2/emc.h @@ -0,0 +1,113 @@ +/* + * Copyright (c) 2011 The Chromium OS Authors. + * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com> + * + * 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 + */ + +#ifndef _ARCH_EMC_H_ +#define _ARCH_EMC_H_ + +#include <asm/types.h> + +#define TEGRA_EMC_NUM_REGS 46 + +/* EMC Registers */ +struct emc_ctlr { + u32 cfg; /* 0x00: EMC_CFG */ + u32 reserved0[3]; /* 0x04 ~ 0x0C */ + u32 adr_cfg; /* 0x10: EMC_ADR_CFG */ + u32 adr_cfg1; /* 0x14: EMC_ADR_CFG_1 */ + u32 reserved1[2]; /* 0x18 ~ 0x18 */ + u32 refresh_ctrl; /* 0x20: EMC_REFCTRL */ + u32 pin; /* 0x24: EMC_PIN */ + u32 timing_ctrl; /* 0x28: EMC_TIMING_CONTROL */ + u32 rc; /* 0x2C: EMC_RC */ + u32 rfc; /* 0x30: EMC_RFC */ + u32 ras; /* 0x34: EMC_RAS */ + u32 rp; /* 0x38: EMC_RP */ + u32 r2w; /* 0x3C: EMC_R2W */ + u32 w2r; /* 0x40: EMC_W2R */ + u32 r2p; /* 0x44: EMC_R2P */ + u32 w2p; /* 0x48: EMC_W2P */ + u32 rd_rcd; /* 0x4C: EMC_RD_RCD */ + u32 wd_rcd; /* 0x50: EMC_WD_RCD */ + u32 rrd; /* 0x54: EMC_RRD */ + u32 rext; /* 0x58: EMC_REXT */ + u32 wdv; /* 0x5C: EMC_WDV */ + u32 quse; /* 0x60: EMC_QUSE */ + u32 qrst; /* 0x64: EMC_QRST */ + u32 qsafe; /* 0x68: EMC_QSAFE */ + u32 rdv; /* 0x6C: EMC_RDV */ + u32 refresh; /* 0x70: EMC_REFRESH */ + u32 burst_refresh_num; /* 0x74: EMC_BURST_REFRESH_NUM */ + u32 pdex2wr; /* 0x78: EMC_PDEX2WR */ + u32 pdex2rd; /* 0x7c: EMC_PDEX2RD */ + u32 pchg2pden; /* 0x80: EMC_PCHG2PDEN */ + u32 act2pden; /* 0x84: EMC_ACT2PDEN */ + u32 ar2pden; /* 0x88: EMC_AR2PDEN */ + u32 rw2pden; /* 0x8C: EMC_RW2PDEN */ + u32 txsr; /* 0x90: EMC_TXSR */ + u32 tcke; /* 0x94: EMC_TCKE */ + u32 tfaw; /* 0x98: EMC_TFAW */ + u32 trpab; /* 0x9C: EMC_TRPAB */ + u32 tclkstable; /* 0xA0: EMC_TCLKSTABLE */ + u32 tclkstop; /* 0xA4: EMC_TCLKSTOP */ + u32 trefbw; /* 0xA8: EMC_TREFBW */ + u32 quse_extra; /* 0xAC: EMC_QUSE_EXTRA */ + u32 odt_write; /* 0xB0: EMC_ODT_WRITE */ + u32 odt_read; /* 0xB4: EMC_ODT_READ */ + u32 reserved2[5]; /* 0xB8 ~ 0xC8 */ + u32 mrs; /* 0xCC: EMC_MRS */ + u32 emrs; /* 0xD0: EMC_EMRS */ + u32 ref; /* 0xD4: EMC_REF */ + u32 pre; /* 0xD8: EMC_PRE */ + u32 nop; /* 0xDC: EMC_NOP */ + u32 self_ref; /* 0xE0: EMC_SELF_REF */ + u32 dpd; /* 0xE4: EMC_DPD */ + u32 mrw; /* 0xE8: EMC_MRW */ + u32 mrr; /* 0xEC: EMC_MRR */ + u32 reserved3; /* 0xF0: */ + u32 fbio_cfg1; /* 0xF4: EMC_FBIO_CFG1 */ + u32 fbio_dqsib_dly; /* 0xF8: EMC_FBIO_DQSIB_DLY */ + u32 fbio_dqsib_dly_msb; /* 0xFC: EMC_FBIO_DQSIB_DLY_MSG */ + u32 fbio_spare; /* 0x100: SBIO_SPARE */ + /* There are more registers ... */ +}; + +/** + * Set up the EMC for the given rate. The timing parameters are retrieved + * from the device tree "nvidia,tegra20-emc" node and its + * "nvidia,tegra20-emc-table" sub-nodes. + * + * @param blob Device tree blob + * @param rate Clock speed of memory controller in Hz (=2x memory bus rate) + * @return 0 if ok, else -ve error code (look in emc.c to decode it) + */ +int tegra_set_emc(const void *blob, unsigned rate); + +/** + * Get a pointer to the EMC controller from the device tree. + * + * @param blob Device tree blob + * @return pointer to EMC controller + */ +struct emc_ctlr *emc_get_controller(const void *blob); + +#endif diff --git a/include/fdtdec.h b/include/fdtdec.h index 0351a25..49251d5 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -60,6 +60,8 @@ enum fdt_compat_id { COMPAT_NVIDIA_TEGRA20_USB, /* Tegra2 USB port */ COMPAT_NVIDIA_TEGRA20_I2C, /* Tegra2 i2c */ COMPAT_NVIDIA_TEGRA20_DVC, /* Tegra2 dvc (really just i2c) */ + COMPAT_NVIDIA_TEGRA20_EMC, /* Tegra2 memory controller */ + COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra2 memory timing table */
COMPAT_COUNT, }; diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 76d3808..42c3e89 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -40,6 +40,8 @@ static const char * const compat_names[COMPAT_COUNT] = { COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"), COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"), COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"), + COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), + COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), };
const char *fdtdec_get_compatible(enum fdt_compat_id id)