diff options
| -rw-r--r-- | drivers/memory/tegra/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/memory/tegra/tegra30-emc.c | 131 |
2 files changed, 122 insertions, 10 deletions
diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig index 7951764b4efe..3fe83d7c2bf8 100644 --- a/drivers/memory/tegra/Kconfig +++ b/drivers/memory/tegra/Kconfig @@ -28,6 +28,7 @@ config TEGRA30_EMC default y depends on ARCH_TEGRA_3x_SOC || COMPILE_TEST select PM_OPP + select DDR help This driver is for the External Memory Controller (EMC) found on Tegra30 chips. The EMC controls the external DRAM on the board. diff --git a/drivers/memory/tegra/tegra30-emc.c b/drivers/memory/tegra/tegra30-emc.c index 80f98d717e13..9ba2a9e5316b 100644 --- a/drivers/memory/tegra/tegra30-emc.c +++ b/drivers/memory/tegra/tegra30-emc.c @@ -9,6 +9,7 @@ * Copyright (C) 2019 GRATE-DRIVER project */ +#include <linux/bitfield.h> #include <linux/clk.h> #include <linux/clk/tegra.h> #include <linux/debugfs.h> @@ -31,11 +32,15 @@ #include <soc/tegra/common.h> #include <soc/tegra/fuse.h> +#include "../jedec_ddr.h" +#include "../of_memory.h" + #include "mc.h" #define EMC_INTSTATUS 0x000 #define EMC_INTMASK 0x004 #define EMC_DBG 0x008 +#define EMC_ADR_CFG 0x010 #define EMC_CFG 0x00c #define EMC_REFCTRL 0x020 #define EMC_TIMING_CONTROL 0x028 @@ -81,6 +86,7 @@ #define EMC_EMRS 0x0d0 #define EMC_SELF_REF 0x0e0 #define EMC_MRW 0x0e8 +#define EMC_MRR 0x0ec #define EMC_XM2DQSPADCTRL3 0x0f8 #define EMC_FBIO_SPARE 0x100 #define EMC_FBIO_CFG5 0x104 @@ -208,6 +214,13 @@ #define EMC_REFRESH_OVERFLOW_INT BIT(3) #define EMC_CLKCHANGE_COMPLETE_INT BIT(4) +#define EMC_MRR_DIVLD_INT BIT(5) + +#define EMC_MRR_DEV_SELECTN GENMASK(31, 30) +#define EMC_MRR_MRR_MA GENMASK(23, 16) +#define EMC_MRR_MRR_DATA GENMASK(15, 0) + +#define EMC_ADR_CFG_EMEM_NUMDEV BIT(0) enum emc_dram_type { DRAM_TYPE_DDR3, @@ -378,6 +391,8 @@ struct tegra_emc { /* protect shared rate-change code path */ struct mutex rate_lock; + + bool mrr_error; }; static int emc_seq_update_timing(struct tegra_emc *emc) @@ -1008,12 +1023,18 @@ static int emc_load_timings_from_dt(struct tegra_emc *emc, return 0; } -static struct device_node *emc_find_node_by_ram_code(struct device *dev) +static struct device_node *emc_find_node_by_ram_code(struct tegra_emc *emc) { + struct device *dev = emc->dev; struct device_node *np; u32 value, ram_code; int err; + if (emc->mrr_error) { + dev_warn(dev, "memory timings skipped due to MRR error\n"); + return NULL; + } + if (of_get_child_count(dev->of_node) == 0) { dev_info_once(dev, "device-tree doesn't have memory timings\n"); return NULL; @@ -1035,11 +1056,73 @@ static struct device_node *emc_find_node_by_ram_code(struct device *dev) return NULL; } +static int emc_read_lpddr_mode_register(struct tegra_emc *emc, + unsigned int emem_dev, + unsigned int register_addr, + unsigned int *register_data) +{ + u32 memory_dev = emem_dev ? 1 : 2; + u32 val, mr_mask = 0xff; + int err; + + /* clear data-valid interrupt status */ + writel_relaxed(EMC_MRR_DIVLD_INT, emc->regs + EMC_INTSTATUS); + + /* issue mode register read request */ + val = FIELD_PREP(EMC_MRR_DEV_SELECTN, memory_dev); + val |= FIELD_PREP(EMC_MRR_MRR_MA, register_addr); + + writel_relaxed(val, emc->regs + EMC_MRR); + + /* wait for the LPDDR2 data-valid interrupt */ + err = readl_relaxed_poll_timeout_atomic(emc->regs + EMC_INTSTATUS, val, + val & EMC_MRR_DIVLD_INT, + 1, 100); + if (err) { + dev_err(emc->dev, "mode register %u read failed: %d\n", + register_addr, err); + emc->mrr_error = true; + return err; + } + + /* read out mode register data */ + val = readl_relaxed(emc->regs + EMC_MRR); + *register_data = FIELD_GET(EMC_MRR_MRR_DATA, val) & mr_mask; + + return 0; +} + +static void emc_read_lpddr_sdram_info(struct tegra_emc *emc, + unsigned int emem_dev) +{ + union lpddr2_basic_config4 basic_conf4; + unsigned int manufacturer_id; + unsigned int revision_id1; + unsigned int revision_id2; + + /* these registers are standard for all LPDDR JEDEC memory chips */ + emc_read_lpddr_mode_register(emc, emem_dev, 5, &manufacturer_id); + emc_read_lpddr_mode_register(emc, emem_dev, 6, &revision_id1); + emc_read_lpddr_mode_register(emc, emem_dev, 7, &revision_id2); + emc_read_lpddr_mode_register(emc, emem_dev, 8, &basic_conf4.value); + + dev_info(emc->dev, "SDRAM[dev%u]: manufacturer: 0x%x (%s) rev1: 0x%x rev2: 0x%x prefetch: S%u density: %uMbit iowidth: %ubit\n", + emem_dev, manufacturer_id, + lpddr2_jedec_manufacturer(manufacturer_id), + revision_id1, revision_id2, + 4 >> basic_conf4.arch_type, + 64 << basic_conf4.density, + 32 >> basic_conf4.io_width); +} + static int emc_setup_hw(struct tegra_emc *emc) { + u32 fbio_cfg5, emc_cfg, emc_dbg, emc_adr_cfg; u32 intmask = EMC_REFRESH_OVERFLOW_INT; - u32 fbio_cfg5, emc_cfg, emc_dbg; + static bool print_sdram_info_once; enum emc_dram_type dram_type; + const char *dram_type_str; + unsigned int emem_numdev; fbio_cfg5 = readl_relaxed(emc->regs + EMC_FBIO_CFG5); dram_type = fbio_cfg5 & EMC_FBIO_CFG5_DRAM_TYPE_MASK; @@ -1076,6 +1159,34 @@ static int emc_setup_hw(struct tegra_emc *emc) emc_dbg &= ~EMC_DBG_FORCE_UPDATE; writel_relaxed(emc_dbg, emc->regs + EMC_DBG); + switch (dram_type) { + case DRAM_TYPE_DDR1: + dram_type_str = "DDR1"; + break; + case DRAM_TYPE_LPDDR2: + dram_type_str = "LPDDR2"; + break; + case DRAM_TYPE_DDR2: + dram_type_str = "DDR2"; + break; + case DRAM_TYPE_DDR3: + dram_type_str = "DDR3"; + break; + } + + emc_adr_cfg = readl_relaxed(emc->regs + EMC_ADR_CFG); + emem_numdev = FIELD_GET(EMC_ADR_CFG_EMEM_NUMDEV, emc_adr_cfg) + 1; + + dev_info_once(emc->dev, "%u %s %s attached\n", emem_numdev, + dram_type_str, emem_numdev == 2 ? "devices" : "device"); + + if (dram_type == DRAM_TYPE_LPDDR2 && !print_sdram_info_once) { + while (emem_numdev--) + emc_read_lpddr_sdram_info(emc, emem_numdev); + + print_sdram_info_once = true; + } + return 0; } @@ -1538,14 +1649,6 @@ static int tegra_emc_probe(struct platform_device *pdev) emc->clk_nb.notifier_call = emc_clk_change_notify; emc->dev = &pdev->dev; - np = emc_find_node_by_ram_code(&pdev->dev); - if (np) { - err = emc_load_timings_from_dt(emc, np); - of_node_put(np); - if (err) - return err; - } - emc->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(emc->regs)) return PTR_ERR(emc->regs); @@ -1554,6 +1657,14 @@ static int tegra_emc_probe(struct platform_device *pdev) if (err) return err; + np = emc_find_node_by_ram_code(emc); + if (np) { + err = emc_load_timings_from_dt(emc, np); + of_node_put(np); + if (err) + return err; + } + err = platform_get_irq(pdev, 0); if (err < 0) return err; |