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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include "emif.h"#include "jedec_ddr.h"#include "of_memory.h"
/** * struct emif_data - Per device static data for driver's use * @duplicate: Whether the DDR devices attached to this EMIF * instance are exactly same as that on EMIF1. In * this case we can save some memory and processing * @temperature_level: Maximum temperature of LPDDR2 devices attached * to this EMIF - read from MR4 register. If there * are two devices attached to this EMIF, this * value is the maximum of the two temperature * levels. * @lpmode: Chosen low power mode * @node: node in the device list * @base: base address of memory-mapped IO registers. * @dev: device pointer. * @regs_cache: An array of 'struct emif_regs' that stores * calculated register values for different * frequencies, to avoid re-calculating them on * each DVFS transition. * @curr_regs: The set of register values used in the last * frequency change (i.e. corresponding to the * frequency in effect at the moment) * @plat_data: Pointer to saved platform data. * @debugfs_root: dentry to the root folder for EMIF in debugfs * @np_ddr: Pointer to ddr device tree node */struct emif_data { u8 duplicate; u8 temperature_level; u8 lpmode; struct list_head node; void __iomem *base; struct device *dev; struct emif_regs *regs_cache[EMIF_MAX_NUM_FREQUENCIES]; struct emif_regs *curr_regs; struct emif_platform_data *plat_data; struct dentry *debugfs_root; struct device_node *np_ddr;};
static struct emif_data *emif1;static DEFINE_SPINLOCK(emif_lock);static LIST_HEAD(device_list);
static void do_emif_regdump_show(struct seq_file *s, struct emif_data *emif, struct emif_regs *regs){ u32 type = emif->plat_data->device_info->type; u32 ip_rev = emif->plat_data->ip_rev;
seq_printf(s, "EMIF register cache dump for %dMHz\n", regs->freq/1000000);
seq_printf(s, "ref_ctrl_shdw\t: 0x%08x\n", regs->ref_ctrl_shdw); seq_printf(s, "sdram_tim1_shdw\t: 0x%08x\n", regs->sdram_tim1_shdw); seq_printf(s, "sdram_tim2_shdw\t: 0x%08x\n", regs->sdram_tim2_shdw); seq_printf(s, "sdram_tim3_shdw\t: 0x%08x\n", regs->sdram_tim3_shdw);
if (ip_rev == EMIF_4D) { seq_printf(s, "read_idle_ctrl_shdw_normal\t: 0x%08x\n", regs->read_idle_ctrl_shdw_normal); seq_printf(s, "read_idle_ctrl_shdw_volt_ramp\t: 0x%08x\n", regs->read_idle_ctrl_shdw_volt_ramp); } else if (ip_rev == EMIF_4D5) { seq_printf(s, "dll_calib_ctrl_shdw_normal\t: 0x%08x\n", regs->dll_calib_ctrl_shdw_normal); seq_printf(s, "dll_calib_ctrl_shdw_volt_ramp\t: 0x%08x\n", regs->dll_calib_ctrl_shdw_volt_ramp); }
if (type == DDR_TYPE_LPDDR2_S2 || type == DDR_TYPE_LPDDR2_S4) { seq_printf(s, "ref_ctrl_shdw_derated\t: 0x%08x\n", regs->ref_ctrl_shdw_derated); seq_printf(s, "sdram_tim1_shdw_derated\t: 0x%08x\n", regs->sdram_tim1_shdw_derated); seq_printf(s, "sdram_tim3_shdw_derated\t: 0x%08x\n", regs->sdram_tim3_shdw_derated); }}
static int emif_regdump_show(struct seq_file *s, void *unused){ struct emif_data *emif = s->private; struct emif_regs **regs_cache; int i;
if (emif->duplicate) regs_cache = emif1->regs_cache; else regs_cache = emif->regs_cache;
for (i = 0; i < EMIF_MAX_NUM_FREQUENCIES && regs_cache[i]; i++) { do_emif_regdump_show(s, emif, regs_cache[i]); seq_putc(s, '\n'); }
return 0;}
DEFINE_SHOW_ATTRIBUTE(emif_regdump);
static int emif_mr4_show(struct seq_file *s, void *unused){ struct emif_data *emif = s->private;
seq_printf(s, "MR4=%d\n", emif->temperature_level); return 0;}
DEFINE_SHOW_ATTRIBUTE(emif_mr4);
static void emif_debugfs_init(struct emif_data *emif){ if (IS_ENABLED(CONFIG_DEBUG_FS)) { emif->debugfs_root = debugfs_create_dir(dev_name(emif->dev), NULL); debugfs_create_file("regcache_dump", S_IRUGO, emif->debugfs_root, emif, &emif_regdump_fops); debugfs_create_file("mr4", S_IRUGO, emif->debugfs_root, emif, &emif_mr4_fops); }}
static void emif_debugfs_exit(struct emif_data *emif){ if (IS_ENABLED(CONFIG_DEBUG_FS)) { debugfs_remove_recursive(emif->debugfs_root); emif->debugfs_root = NULL; }}
/* * Get bus width used by EMIF. Note that this may be different from the * bus width of the DDR devices used. For instance two 16-bit DDR devices * may be connected to a given CS of EMIF. In this case bus width as far * as EMIF is concerned is 32, where as the DDR bus width is 16 bits. */static u32 get_emif_bus_width(struct emif_data *emif){ u32 width; void __iomem *base = emif->base;
width = (readl(base + EMIF_SDRAM_CONFIG) & NARROW_MODE_MASK) >> NARROW_MODE_SHIFT; width = width == 0 ? 32 : 16;
return width;}
static void set_lpmode(struct emif_data *emif, u8 lpmode){ u32 temp; void __iomem *base = emif->base;
/* * Workaround for errata i743 - LPDDR2 Power-Down State is Not * Efficient * * i743 DESCRIPTION: * The EMIF supports power-down state for low power. The EMIF * automatically puts the SDRAM into power-down after the memory is * not accessed for a defined number of cycles and the * EMIF_PWR_MGMT_CTRL[10:8] REG_LP_MODE bit field is set to 0x4. * As the EMIF supports automatic output impedance calibration, a ZQ * calibration long command is issued every time it exits active * power-down and precharge power-down modes. The EMIF waits and * blocks any other command during this calibration. * The EMIF does not allow selective disabling of ZQ calibration upon * exit of power-down mode. Due to very short periods of power-down * cycles, ZQ calibration overhead creates bandwidth issues and * increases overall system power consumption. On the other hand, * issuing ZQ calibration long commands when exiting self-refresh is * still required. * * WORKAROUND * Because there is no power consumption benefit of the power-down due * to the calibration and there is a performance risk, the guideline * is to not allow power-down state and, therefore, to not have set * the EMIF_PWR_MGMT_CTRL[10:8] REG_LP_MODE bit field to 0x4. */ if ((emif->plat_data->ip_rev == EMIF_4D) && (lpmode == EMIF_LP_MODE_PWR_DN)) { WARN_ONCE(1, "REG_LP_MODE = LP_MODE_PWR_DN(4) is prohibited by erratum i743 switch to LP_MODE_SELF_REFRESH(2)\n"); /* rollback LP_MODE to Self-refresh mode */ lpmode = EMIF_LP_MODE_SELF_REFRESH; }
temp = readl(base + EMIF_POWER_MANAGEMENT_CONTROL); temp &= ~LP_MODE_MASK; temp |= (lpmode << LP_MODE_SHIFT); writel(temp, base + EMIF_POWER_MANAGEMENT_CONTROL);}
static void do_freq_update(void){ struct emif_data *emif;
/* * Workaround for errata i728: Disable LPMODE during FREQ_UPDATE * * i728 DESCRIPTION: * The EMIF automatically puts the SDRAM into self-refresh mode * after the EMIF has not performed accesses during * EMIF_PWR_MGMT_CTRL[7:4] REG_SR_TIM number of DDR clock cycles * and the EMIF_PWR_MGMT_CTRL[10:8] REG_LP_MODE bit field is set * to 0x2. If during a small window the following three events * occur: * - The SR_TIMING counter expires * - And frequency change is requested * - And OCP access is requested * Then it causes instable clock on the DDR interface. * * WORKAROUND * To avoid the occurrence of the three events, the workaround * is to disable the self-refresh when requesting a frequency * change. Before requesting a frequency change the software must * program EMIF_PWR_MGMT_CTRL[10:8] REG_LP_MODE to 0x0. When the * frequency change has been done, the software can reprogram * EMIF_PWR_MGMT_CTRL[10:8] REG_LP_MODE to 0x2 */ list_for_each_entry(emif, &device_list, node) { if (emif->lpmode == EMIF_LP_MODE_SELF_REFRESH) set_lpmode(emif, EMIF_LP_MODE_DISABLE); }
/* * TODO: Do FREQ_UPDATE here when an API * is available for this as part of the new * clock framework */
list_for_each_entry(emif, &device_list, node) { if (emif->lpmode == EMIF_LP_MODE_SELF_REFRESH) set_lpmode(emif, EMIF_LP_MODE_SELF_REFRESH); }}
/* Find addressing table entry based on the device's type and density */static const struct lpddr2_addressing *get_addressing_table( const struct ddr_device_info *device_info){ u32 index, type, density;
type = device_info->type; density = device_info->density;
switch (type) { case DDR_TYPE_LPDDR2_S4: index = density - 1; break; case DDR_TYPE_LPDDR2_S2: switch (density) { case DDR_DENSITY_1Gb: case DDR_DENSITY_2Gb: index = density + 3; break; default: index = density - 1; } break; default: return NULL; }
return &lpddr2_jedec_addressing_table[index];}
static u32 get_zq_config_reg(const struct lpddr2_addressing *addressing, bool cs1_used, bool cal_resistors_per_cs){ u32 zq = 0, val = 0;
val = EMIF_ZQCS_INTERVAL_US * 1000 / addressing->tREFI_ns; zq |= val << ZQ_REFINTERVAL_SHIFT;
val = DIV_ROUND_UP(T_ZQCL_DEFAULT_NS, T_ZQCS_DEFAULT_NS) - 1; zq |= val << ZQ_ZQCL_MULT_SHIFT;
val = DIV_ROUND_UP(T_ZQINIT_DEFAULT_NS, T_ZQCL_DEFAULT_NS) - 1; zq |= val << ZQ_ZQINIT_MULT_SHIFT;
zq |= ZQ_SFEXITEN_ENABLE << ZQ_SFEXITEN_SHIFT;
if (cal_resistors_per_cs) zq |= ZQ_DUALCALEN_ENABLE << ZQ_DUALCALEN_SHIFT; else zq |= ZQ_DUALCALEN_DISABLE << ZQ_DUALCALEN_SHIFT;
zq |= ZQ_CS0EN_MASK; /* CS0 is used for sure */
val = cs1_used ? 1 : 0; zq |= val << ZQ_CS1EN_SHIFT;
return zq;}
static u32 get_temp_alert_config(const struct lpddr2_addressing *addressing, const struct emif_custom_configs *custom_configs, bool cs1_used, u32 sdram_io_width, u32 emif_bus_width){ u32 alert = 0, interval, devcnt;
if (custom_configs && (custom_configs->mask & EMIF_CUSTOM_CONFIG_TEMP_ALERT_POLL_INTERVAL)) interval = custom_configs->temp_alert_poll_interval_ms; else interval = TEMP_ALERT_POLL_INTERVAL_DEFAULT_MS;
interval *= 1000000; /* Convert to ns */ interval /= addressing->tREFI_ns; /* Convert to refresh cycles */ alert |= (interval << TA_REFINTERVAL_SHIFT);
/* * sdram_io_width is in 'log2(x) - 1' form. Convert emif_bus_width * also to this form and subtract to get TA_DEVCNT, which is * in log2(x) form. */ emif_bus_width = __fls(emif_bus_width) - 1; devcnt = emif_bus_width - sdram_io_width; alert |= devcnt << TA_DEVCNT_SHIFT;
/* DEVWDT is in 'log2(x) - 3' form */ alert |= (sdram_io_width - 2) << TA_DEVWDT_SHIFT;
alert |= 1 << TA_SFEXITEN_SHIFT; alert |= 1 << TA_CS0EN_SHIFT; alert |= (cs1_used ? 1 : 0) << TA_CS1EN_SHIFT;
return alert;}
static u32 get_pwr_mgmt_ctrl(u32 freq, struct emif_data *emif, u32 ip_rev){ u32 pwr_mgmt_ctrl = 0, timeout; u32 lpmode = EMIF_LP_MODE_SELF_REFRESH; u32 timeout_perf = EMIF_LP_MODE_TIMEOUT_PERFORMANCE; u32 timeout_pwr = EMIF_LP_MODE_TIMEOUT_POWER; u32 freq_threshold = EMIF_LP_MODE_FREQ_THRESHOLD; u32 mask; u8 shift;
struct emif_custom_configs *cust_cfgs = emif->plat_data->custom_configs;
if (cust_cfgs && (cust_cfgs->mask & EMIF_CUSTOM_CONFIG_LPMODE)) { lpmode = cust_cfgs->lpmode; timeout_perf = cust_cfgs->lpmode_timeout_performance; timeout_pwr = cust_cfgs->lpmode_timeout_power; freq_threshold = cust_cfgs->lpmode_freq_threshold; }
/* Timeout based on DDR frequency */ timeout = freq >= freq_threshold ? timeout_perf : timeout_pwr;
/* * The value to be set in register is "log2(timeout) - 3" * if timeout < 16 load 0 in register * if timeout is not a power of 2, round to next highest power of 2 */ if (timeout < 16) { timeout = 0; } else { if (timeout & (timeout - 1)) timeout <<= 1; timeout = __fls(timeout) - 3; }
switch (lpmode) { case EMIF_LP_MODE_CLOCK_STOP: shift = CS_TIM_SHIFT; mask = CS_TIM_MASK; break; case EMIF_LP_MODE_SELF_REFRESH: /* Workaround for errata i735 */ if (timeout < 6) timeout = 6;
shift = SR_TIM_SHIFT; mask = SR_TIM_MASK; break; case EMIF_LP_MODE_PWR_DN: shift = PD_TIM_SHIFT; mask = PD_TIM_MASK; break; case EMIF_LP_MODE_DISABLE: default: mask = 0; shift = 0; break; } /* Round to maximum in case of overflow, BUT warn! */ if (lpmode != EMIF_LP_MODE_DISABLE && timeout > mask >> shift) { pr_err("TIMEOUT Overflow - lpmode=%d perf=%d pwr=%d freq=%d\n", lpmode, timeout_perf, timeout_pwr, freq_threshold); WARN(1, "timeout=0x%02x greater than 0x%02x. Using max\n", timeout, mask >> shift); timeout = mask >> shift; }
/* Setup required timing */ pwr_mgmt_ctrl = (timeout << shift) & mask; /* setup a default mask for rest of the modes */ pwr_mgmt_ctrl |= (SR_TIM_MASK | CS_TIM_MASK | PD_TIM_MASK) & ~mask;
/* No CS_TIM in EMIF_4D5 */ if (ip_rev == EMIF_4D5) pwr_mgmt_ctrl &= ~CS_TIM_MASK;
pwr_mgmt_ctrl |= lpmode << LP_MODE_SHIFT;
return pwr_mgmt_ctrl;}
/* * Get the temperature level of the EMIF instance: * Reads the MR4 register of attached SDRAM parts to find out the temperature * level. If there are two parts attached(one on each CS), then the temperature * level for the EMIF instance is the higher of the two temperatures. */static void get_temperature_level(struct emif_data *emif){ u32 temp, temperature_level; void __iomem *base;
base = emif->base;
/* Read mode register 4 */ writel(DDR_MR4, base + EMIF_LPDDR2_MODE_REG_CONFIG); temperature_level = readl(base + EMIF_LPDDR2_MODE_REG_DATA); temperature_level = (temperature_level & MR4_SDRAM_REF_RATE_MASK) >> MR4_SDRAM_REF_RATE_SHIFT;
if (emif->plat_data->device_info->cs1_used) { writel(DDR_MR4 | CS_MASK, base + EMIF_LPDDR2_MODE_REG_CONFIG); temp = readl(base + EMIF_LPDDR2_MODE_REG_DATA); temp = (temp & MR4_SDRAM_REF_RATE_MASK) >> MR4_SDRAM_REF_RATE_SHIFT; temperature_level = max(temp, temperature_level); }
/* treat everything less than nominal(3) in MR4 as nominal */ if (unlikely(temperature_level < SDRAM_TEMP_NOMINAL)) temperature_level = SDRAM_TEMP_NOMINAL;
/* if we get reserved value in MR4 persist with the existing value */ if (likely(temperature_level != SDRAM_TEMP_RESERVED_4)) emif->temperature_level = temperature_level;}
/* * setup_temperature_sensitive_regs() - set the timings for temperature * sensitive registers. This happens once at initialisation time based * on the temperature at boot time and subsequently based on the temperature * alert interrupt. Temperature alert can happen when the temperature * increases or drops. So this function can have the effect of either * derating the timings or going back to nominal values. */static void setup_temperature_sensitive_regs(struct emif_data *emif, struct emif_regs *regs){ u32 tim1, tim3, ref_ctrl, type; void __iomem *base = emif->base; u32 temperature;
type = emif->plat_data->device_info->type;
tim1 = regs->sdram_tim1_shdw; tim3 = regs->sdram_tim3_shdw; ref_ctrl = regs->ref_ctrl_shdw;
/* No de-rating for non-lpddr2 devices */ if (type != DDR_TYPE_LPDDR2_S2 && type != DDR_TYPE_LPDDR2_S4) goto out;
temperature = emif->temperature_level; if (temperature == SDRAM_TEMP_HIGH_DERATE_REFRESH) { ref_ctrl = regs->ref_ctrl_shdw_derated; } else if (temperature == SDRAM_TEMP_HIGH_DERATE_REFRESH_AND_TIMINGS) { tim1 = regs->sdram_tim1_shdw_derated; tim3 = regs->sdram_tim3_shdw_derated; ref_ctrl = regs->ref_ctrl_shdw_derated; }
out: writel(tim1, base + EMIF_SDRAM_TIMING_1_SHDW); writel(tim3, base + EMIF_SDRAM_TIMING_3_SHDW); writel(ref_ctrl, base + EMIF_SDRAM_REFRESH_CTRL_SHDW);}
static irqreturn_t handle_temp_alert(void __iomem *base, struct emif_data *emif){ u32 old_temp_level; irqreturn_t ret; struct emif_custom_configs *custom_configs;
guard(spinlock_irqsave)(&emif_lock); old_temp_level = emif->temperature_level; get_temperature_level(emif);
if (unlikely(emif->temperature_level == old_temp_level)) { return IRQ_HANDLED; } else if (!emif->curr_regs) { dev_err(emif->dev, "temperature alert before registers are calculated, not de-rating timings\n"); return IRQ_HANDLED; }
custom_configs = emif->plat_data->custom_configs;
/* * IF we detect higher than "nominal rating" from DDR sensor * on an unsupported DDR part, shutdown system */ if (custom_configs && !(custom_configs->mask & EMIF_CUSTOM_CONFIG_EXTENDED_TEMP_PART)) { if (emif->temperature_level >= SDRAM_TEMP_HIGH_DERATE_REFRESH) { dev_err(emif->dev, "%s:NOT Extended temperature capable memory. Converting MR4=0x%02x as shutdown event\n", __func__, emif->temperature_level); /* * Temperature far too high - do kernel_power_off() * from thread context */ emif->temperature_level = SDRAM_TEMP_VERY_HIGH_SHUTDOWN; return IRQ_WAKE_THREAD; } }
if (emif->temperature_level < old_temp_level || emif->temperature_level == SDRAM_TEMP_VERY_HIGH_SHUTDOWN) { /* * Temperature coming down - defer handling to thread OR * Temperature far too high - do kernel_power_off() from * thread context */ ret = IRQ_WAKE_THREAD; } else { /* Temperature is going up - handle immediately */ setup_temperature_sensitive_regs(emif, emif->curr_regs); do_freq_update(); ret = IRQ_HANDLED; }
return ret;}
static irqreturn_t emif_interrupt_handler(int irq, void *dev_id){ u32 interrupts; struct emif_data *emif = dev_id; void __iomem *base = emif->base; struct device *dev = emif->dev; irqreturn_t ret = IRQ_HANDLED;
/* Save the status and clear it */ interrupts = readl(base + EMIF_SYSTEM_OCP_INTERRUPT_STATUS); writel(interrupts, base + EMIF_SYSTEM_OCP_INTERRUPT_STATUS);
/* * Handle temperature alert * Temperature alert should be same for all ports * So, it's enough to process it only for one of the ports */ if (interrupts & TA_SYS_MASK) ret = handle_temp_alert(base, emif);
if (interrupts & ERR_SYS_MASK) dev_err(dev, "Access error from SYS port - %x\n", interrupts);
if (emif->plat_data->hw_caps & EMIF_HW_CAPS_LL_INTERFACE) { /* Save the status and clear it */ interrupts = readl(base + EMIF_LL_OCP_INTERRUPT_STATUS); writel(interrupts, base + EMIF_LL_OCP_INTERRUPT_STATUS);
if (interrupts & ERR_LL_MASK) dev_err(dev, "Access error from LL port - %x\n", interrupts); }
return ret;}
static irqreturn_t emif_threaded_isr(int irq, void *dev_id){ struct emif_data *emif = dev_id; unsigned long irq_state;
if (emif->temperature_level == SDRAM_TEMP_VERY_HIGH_SHUTDOWN) { dev_emerg(emif->dev, "SDRAM temperature exceeds operating limit.. Needs shut down!!!\n");
/* If we have Power OFF ability, use it, else try restarting */ if (kernel_can_power_off()) { kernel_power_off(); } else { WARN(1, "FIXME: NO pm_power_off!!! trying restart\n"); kernel_restart("SDRAM Over-temp Emergency restart"); } return IRQ_HANDLED; }
spin_lock_irqsave(&emif_lock, irq_state);
if (emif->curr_regs) { setup_temperature_sensitive_regs(emif, emif->curr_regs); do_freq_update(); } else { dev_err(emif->dev, "temperature alert before registers are calculated, not de-rating timings\n"); }
spin_unlock_irqrestore(&emif_lock, irq_state);
return IRQ_HANDLED;}
static void clear_all_interrupts(struct emif_data *emif){ void __iomem *base = emif->base;
writel(readl(base + EMIF_SYSTEM_OCP_INTERRUPT_STATUS), base + EMIF_SYSTEM_OCP_INTERRUPT_STATUS); if (emif->plat_data->hw_caps & EMIF_HW_CAPS_LL_INTERFACE) writel(readl(base + EMIF_LL_OCP_INTERRUPT_STATUS), base + EMIF_LL_OCP_INTERRUPT_STATUS);}
static void disable_and_clear_all_interrupts(struct emif_data *emif){ void __iomem *base = emif->base;
/* Disable all interrupts */ writel(readl(base + EMIF_SYSTEM_OCP_INTERRUPT_ENABLE_SET), base + EMIF_SYSTEM_OCP_INTERRUPT_ENABLE_CLEAR); if (emif->plat_data->hw_caps & EMIF_HW_CAPS_LL_INTERFACE) writel(readl(base + EMIF_LL_OCP_INTERRUPT_ENABLE_SET), base + EMIF_LL_OCP_INTERRUPT_ENABLE_CLEAR);
/* Clear all interrupts */ clear_all_interrupts(emif);}
static int setup_interrupts(struct emif_data *emif, u32 irq){ u32 interrupts, type; void __iomem *base = emif->base;
type = emif->plat_data->device_info->type;
clear_all_interrupts(emif);
/* Enable interrupts for SYS interface */ interrupts = EN_ERR_SYS_MASK; if (type == DDR_TYPE_LPDDR2_S2 || type == DDR_TYPE_LPDDR2_S4) interrupts |= EN_TA_SYS_MASK; writel(interrupts, base + EMIF_SYSTEM_OCP_INTERRUPT_ENABLE_SET);
/* Enable interrupts for LL interface */ if (emif->plat_data->hw_caps & EMIF_HW_CAPS_LL_INTERFACE) { /* TA need not be enabled for LL */ interrupts = EN_ERR_LL_MASK; writel(interrupts, base + EMIF_LL_OCP_INTERRUPT_ENABLE_SET); }
/* setup IRQ handlers */ return devm_request_threaded_irq(emif->dev, irq, emif_interrupt_handler, emif_threaded_isr, 0, dev_name(emif->dev), emif);
}
static void emif_onetime_settings(struct emif_data *emif){ u32 pwr_mgmt_ctrl, zq, temp_alert_cfg; void __iomem *base = emif->base; const struct lpddr2_addressing *addressing; const struct ddr_device_info *device_info;
device_info = emif->plat_data->device_info; addressing = get_addressing_table(device_info);
/* * Init power management settings * We don't know the frequency yet. Use a high frequency * value for a conservative timeout setting */ pwr_mgmt_ctrl = get_pwr_mgmt_ctrl(1000000000, emif, emif->plat_data->ip_rev); emif->lpmode = (pwr_mgmt_ctrl & LP_MODE_MASK) >> LP_MODE_SHIFT; writel(pwr_mgmt_ctrl, base + EMIF_POWER_MANAGEMENT_CONTROL);
/* Init ZQ calibration settings */ zq = get_zq_config_reg(addressing, device_info->cs1_used, device_info->cal_resistors_per_cs); writel(zq, base + EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG);
/* Check temperature level temperature level*/ get_temperature_level(emif); if (emif->temperature_level == SDRAM_TEMP_VERY_HIGH_SHUTDOWN) dev_emerg(emif->dev, "SDRAM temperature exceeds operating limit.. Needs shut down!!!\n");
/* Init temperature polling */ temp_alert_cfg = get_temp_alert_config(addressing, emif->plat_data->custom_configs, device_info->cs1_used, device_info->io_width, get_emif_bus_width(emif)); writel(temp_alert_cfg, base + EMIF_TEMPERATURE_ALERT_CONFIG);
/* * Program external PHY control registers that are not frequency * dependent */ if (emif->plat_data->phy_type != EMIF_PHY_TYPE_INTELLIPHY) return; writel(EMIF_EXT_PHY_CTRL_1_VAL, base + EMIF_EXT_PHY_CTRL_1_SHDW); writel(EMIF_EXT_PHY_CTRL_5_VAL, base + EMIF_EXT_PHY_CTRL_5_SHDW); writel(EMIF_EXT_PHY_CTRL_6_VAL, base + EMIF_EXT_PHY_CTRL_6_SHDW); writel(EMIF_EXT_PHY_CTRL_7_VAL, base + EMIF_EXT_PHY_CTRL_7_SHDW); writel(EMIF_EXT_PHY_CTRL_8_VAL, base + EMIF_EXT_PHY_CTRL_8_SHDW); writel(EMIF_EXT_PHY_CTRL_9_VAL, base + EMIF_EXT_PHY_CTRL_9_SHDW); writel(EMIF_EXT_PHY_CTRL_10_VAL, base + EMIF_EXT_PHY_CTRL_10_SHDW); writel(EMIF_EXT_PHY_CTRL_11_VAL, base + EMIF_EXT_PHY_CTRL_11_SHDW); writel(EMIF_EXT_PHY_CTRL_12_VAL, base + EMIF_EXT_PHY_CTRL_12_SHDW); writel(EMIF_EXT_PHY_CTRL_13_VAL, base + EMIF_EXT_PHY_CTRL_13_SHDW); writel(EMIF_EXT_PHY_CTRL_14_VAL, base + EMIF_EXT_PHY_CTRL_14_SHDW); writel(EMIF_EXT_PHY_CTRL_15_VAL, base + EMIF_EXT_PHY_CTRL_15_SHDW); writel(EMIF_EXT_PHY_CTRL_16_VAL, base + EMIF_EXT_PHY_CTRL_16_SHDW); writel(EMIF_EXT_PHY_CTRL_17_VAL, base + EMIF_EXT_PHY_CTRL_17_SHDW); writel(EMIF_EXT_PHY_CTRL_18_VAL, base + EMIF_EXT_PHY_CTRL_18_SHDW); writel(EMIF_EXT_PHY_CTRL_19_VAL, base + EMIF_EXT_PHY_CTRL_19_SHDW); writel(EMIF_EXT_PHY_CTRL_20_VAL, base + EMIF_EXT_PHY_CTRL_20_SHDW); writel(EMIF_EXT_PHY_CTRL_21_VAL, base + EMIF_EXT_PHY_CTRL_21_SHDW); writel(EMIF_EXT_PHY_CTRL_22_VAL, base + EMIF_EXT_PHY_CTRL_22_SHDW); writel(EMIF_EXT_PHY_CTRL_23_VAL, base + EMIF_EXT_PHY_CTRL_23_SHDW); writel(EMIF_EXT_PHY_CTRL_24_VAL, base + EMIF_EXT_PHY_CTRL_24_SHDW);}
static void get_default_timings(struct emif_data *emif){ struct emif_platform_data *pd = emif->plat_data;
pd->timings = lpddr2_jedec_timings; pd->timings_arr_size = ARRAY_SIZE(lpddr2_jedec_timings);
dev_warn(emif->dev, "%s: using default timings\n", __func__);}
static int is_dev_data_valid(u32 type, u32 density, u32 io_width, u32 phy_type, u32 ip_rev, struct device *dev){ int valid;
valid = (type == DDR_TYPE_LPDDR2_S4 || type == DDR_TYPE_LPDDR2_S2) && (density >= DDR_DENSITY_64Mb && density <= DDR_DENSITY_8Gb) && (io_width >= DDR_IO_WIDTH_8 && io_width <= DDR_IO_WIDTH_32);
/* Combinations of EMIF and PHY revisions that we support today */ switch (ip_rev) { case EMIF_4D: valid = valid && (phy_type == EMIF_PHY_TYPE_ATTILAPHY); break; case EMIF_4D5: valid = valid && (phy_type == EMIF_PHY_TYPE_INTELLIPHY); break; default: valid = 0; }
if (!valid) dev_err(dev, "%s: invalid DDR details\n", __func__); return valid;}
static int is_custom_config_valid(struct emif_custom_configs *cust_cfgs, struct device *dev){ int valid = 1;
if ((cust_cfgs->mask & EMIF_CUSTOM_CONFIG_LPMODE) && (cust_cfgs->lpmode != EMIF_LP_MODE_DISABLE)) valid = cust_cfgs->lpmode_freq_threshold && cust_cfgs->lpmode_timeout_performance && cust_cfgs->lpmode_timeout_power;
if (cust_cfgs->mask & EMIF_CUSTOM_CONFIG_TEMP_ALERT_POLL_INTERVAL) valid = valid && cust_cfgs->temp_alert_poll_interval_ms;
if (!valid) dev_warn(dev, "%s: invalid custom configs\n", __func__);
return valid;}
static void of_get_custom_configs(struct device_node *np_emif, struct emif_data *emif){ struct emif_custom_configs *cust_cfgs = NULL; int len; const __be32 *lpmode, *poll_intvl;
lpmode = of_get_property(np_emif, "low-power-mode", &len); poll_intvl = of_get_property(np_emif, "temp-alert-poll-interval", &len);
if (lpmode || poll_intvl) cust_cfgs = devm_kzalloc(emif->dev, sizeof(*cust_cfgs), GFP_KERNEL);
if (!cust_cfgs) return;
if (lpmode) { cust_cfgs->mask |= EMIF_CUSTOM_CONFIG_LPMODE; cust_cfgs->lpmode = be32_to_cpup(lpmode); of_property_read_u32(np_emif, "low-power-mode-timeout-performance", &cust_cfgs->lpmode_timeout_performance); of_property_read_u32(np_emif, "low-power-mode-timeout-power", &cust_cfgs->lpmode_timeout_power); of_property_read_u32(np_emif, "low-power-mode-freq-threshold", &cust_cfgs->lpmode_freq_threshold); }
if (poll_intvl) { cust_cfgs->mask |= EMIF_CUSTOM_CONFIG_TEMP_ALERT_POLL_INTERVAL; cust_cfgs->temp_alert_poll_interval_ms = be32_to_cpup(poll_intvl); }
if (of_property_read_bool(np_emif, "extended-temp-part")) cust_cfgs->mask |= EMIF_CUSTOM_CONFIG_EXTENDED_TEMP_PART;
if (!is_custom_config_valid(cust_cfgs, emif->dev)) { devm_kfree(emif->dev, cust_cfgs); return; }
emif->plat_data->custom_configs = cust_cfgs;}
static void of_get_ddr_info(struct device_node *np_emif, struct device_node *np_ddr, struct ddr_device_info *dev_info){ u32 density = 0, io_width = 0;
dev_info->cs1_used = of_property_read_bool(np_emif, "cs1-used"); dev_info->cal_resistors_per_cs = of_property_read_bool(np_emif, "cal-resistor-per-cs");
if (of_device_is_compatible(np_ddr, "jedec,lpddr2-s4")) dev_info->type = DDR_TYPE_LPDDR2_S4; else if (of_device_is_compatible(np_ddr, "jedec,lpddr2-s2")) dev_info->type = DDR_TYPE_LPDDR2_S2;
of_property_read_u32(np_ddr, "density", &density); of_property_read_u32(np_ddr, "io-width", &io_width);
/* Convert from density in Mb to the density encoding in jedc_ddr.h */ if (density & (density - 1)) dev_info->density = 0; else dev_info->density = __fls(density) - 5;
/* Convert from io_width in bits to io_width encoding in jedc_ddr.h */ if (io_width & (io_width - 1)) dev_info->io_width = 0; else dev_info->io_width = __fls(io_width) - 1;}
static struct emif_data *of_get_memory_device_details( struct device_node *np_emif, struct device *dev){ struct emif_data *emif = NULL; struct ddr_device_info *dev_info = NULL; struct emif_platform_data *pd = NULL; struct device_node *np_ddr;
np_ddr = of_parse_phandle(np_emif, "device-handle", 0); if (!np_ddr) goto error; emif = devm_kzalloc(dev, sizeof(struct emif_data), GFP_KERNEL); pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); dev_info = devm_kzalloc(dev, sizeof(*dev_info), GFP_KERNEL);
if (!emif || !pd || !dev_info) { dev_err(dev, "%s: Out of memory!!\n", __func__); goto error; }
emif->plat_data = pd; pd->device_info = dev_info; emif->dev = dev; emif->np_ddr = np_ddr; emif->temperature_level = SDRAM_TEMP_NOMINAL;
if (of_device_is_compatible(np_emif, "ti,emif-4d")) emif->plat_data->ip_rev = EMIF_4D; else if (of_device_is_compatible(np_emif, "ti,emif-4d5")) emif->plat_data->ip_rev = EMIF_4D5;
of_property_read_u32(np_emif, "phy-type", &pd->phy_type);
if (of_property_read_bool(np_emif, "hw-caps-ll-interface")) pd->hw_caps |= EMIF_HW_CAPS_LL_INTERFACE;
of_get_ddr_info(np_emif, np_ddr, dev_info); if (!is_dev_data_valid(pd->device_info->type, pd->device_info->density, pd->device_info->io_width, pd->phy_type, pd->ip_rev, emif->dev)) { dev_err(dev, "%s: invalid device data!!\n", __func__); goto error; } /* * For EMIF instances other than EMIF1 see if the devices connected * are exactly same as on EMIF1(which is typically the case). If so, * mark it as a duplicate of EMIF1. This will save some memory and * computation. */ if (emif1 && emif1->np_ddr == np_ddr) { emif->duplicate = true; goto out; } else if (emif1) { dev_warn(emif->dev, "%s: Non-symmetric DDR geometry\n", __func__); }
of_get_custom_configs(np_emif, emif); emif->plat_data->timings = of_get_ddr_timings(np_ddr, emif->dev, emif->plat_data->device_info->type, &emif->plat_data->timings_arr_size);
emif->plat_data->min_tck = of_get_min_tck(np_ddr, emif->dev); goto out;
error: return NULL;out: return emif;}
static struct emif_data *get_device_details( struct platform_device *pdev){ u32 size; struct emif_data *emif = NULL; struct ddr_device_info *dev_info; struct emif_custom_configs *cust_cfgs; struct emif_platform_data *pd; struct device *dev; void *temp;
pd = pdev->dev.platform_data; dev = &pdev->dev;
if (!(pd && pd->device_info && is_dev_data_valid(pd->device_info->type, pd->device_info->density, pd->device_info->io_width, pd->phy_type, pd->ip_rev, dev))) { dev_err(dev, "%s: invalid device data\n", __func__); goto error; }
emif = devm_kzalloc(dev, sizeof(*emif), GFP_KERNEL); temp = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); dev_info = devm_kzalloc(dev, sizeof(*dev_info), GFP_KERNEL);
if (!emif || !temp || !dev_info) goto error;
memcpy(temp, pd, sizeof(*pd)); pd = temp; memcpy(dev_info, pd->device_info, sizeof(*dev_info));
pd->device_info = dev_info; emif->plat_data = pd; emif->dev = dev; emif->temperature_level = SDRAM_TEMP_NOMINAL;
/* * For EMIF instances other than EMIF1 see if the devices connected * are exactly same as on EMIF1(which is typically the case). If so, * mark it as a duplicate of EMIF1 and skip copying timings data. * This will save some memory and some computation later. */ emif->duplicate = emif1 && (memcmp(dev_info, emif1->plat_data->device_info, sizeof(struct ddr_device_info)) == 0);
if (emif->duplicate) { pd->timings = NULL; pd->min_tck = NULL; goto out; } else if (emif1) { dev_warn(emif->dev, "%s: Non-symmetric DDR geometry\n", __func__); }
/* * Copy custom configs - ignore allocation error, if any, as * custom_configs is not very critical */ cust_cfgs = pd->custom_configs; if (cust_cfgs && is_custom_config_valid(cust_cfgs, dev)) { temp = devm_kzalloc(dev, sizeof(*cust_cfgs), GFP_KERNEL); if (temp) memcpy(temp, cust_cfgs, sizeof(*cust_cfgs)); pd->custom_configs = temp; }
/* * Copy timings and min-tck values from platform data. If it is not * available or if memory allocation fails, use JEDEC defaults */ size = sizeof(struct lpddr2_timings) * pd->timings_arr_size; if (pd->timings) { temp = devm_kzalloc(dev, size, GFP_KERNEL); if (temp) { memcpy(temp, pd->timings, size); pd->timings = temp; } else { get_default_timings(emif); } } else { get_default_timings(emif); }
if (pd->min_tck) { temp = devm_kzalloc(dev, sizeof(*pd->min_tck), GFP_KERNEL); if (temp) { memcpy(temp, pd->min_tck, sizeof(*pd->min_tck)); pd->min_tck = temp; } else { pd->min_tck = &lpddr2_jedec_min_tck; } } else { pd->min_tck = &lpddr2_jedec_min_tck; }
out: return emif;
error: return NULL;}
static int emif_probe(struct platform_device *pdev){ struct emif_data *emif; int irq, ret;
if (pdev->dev.of_node) emif = of_get_memory_device_details(pdev->dev.of_node, &pdev->dev); else emif = get_device_details(pdev);
if (!emif) { pr_err("%s: error getting device data\n", __func__); goto error; }
list_add(&emif->node, &device_list);
/* Save pointers to each other in emif and device structures */ emif->dev = &pdev->dev; platform_set_drvdata(pdev, emif);
emif->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(emif->base)) goto error;
irq = platform_get_irq(pdev, 0); if (irq < 0) goto error;
emif_onetime_settings(emif); emif_debugfs_init(emif); disable_and_clear_all_interrupts(emif); ret = setup_interrupts(emif, irq); if (ret) goto error;
/* One-time actions taken on probing the first device */ if (!emif1) { emif1 = emif;
/* * TODO: register notifiers for frequency and voltage * change here once the respective frameworks are * available */ }
dev_info(&pdev->dev, "%s: device configured with addr = %p and IRQ%d\n", __func__, emif->base, irq);
return 0;error: return -ENODEV;}
static void emif_remove(struct platform_device *pdev){ struct emif_data *emif = platform_get_drvdata(pdev);
emif_debugfs_exit(emif);}
static void emif_shutdown(struct platform_device *pdev){ struct emif_data *emif = platform_get_drvdata(pdev);
disable_and_clear_all_interrupts(emif);}
#if defined(CONFIG_OF)static const struct of_device_id emif_of_match[] = { { .compatible = "ti,emif-4d" }, { .compatible = "ti,emif-4d5" }, {},};MODULE_DEVICE_TABLE(of, emif_of_match);#endif
static struct platform_driver emif_driver = { .probe = emif_probe, .remove = emif_remove, .shutdown = emif_shutdown, .driver = { .name = "emif", .of_match_table = of_match_ptr(emif_of_match), },};
module_platform_driver(emif_driver);
MODULE_DESCRIPTION("TI EMIF SDRAM Controller Driver");MODULE_LICENSE("GPL");MODULE_ALIAS("platform:emif");MODULE_AUTHOR("Texas Instruments Inc");