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emif.c
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/*
* EMIF driver
*
* Copyright (C) 2012 Texas Instruments, Inc.
*
* Aneesh V <aneesh@ti.com>
* Santosh Shilimkar <santosh.shilimkar@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/platform_data/emif_plat.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <memory/jedec_ddr.h>
#include "emif.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.
* @node: node in the device list
* @base: base address of memory-mapped IO registers.
* @dev: device pointer.
* @addressing table with addressing information from the spec
* @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;
unsigned long irq_state;
void __iomem *base;
struct device *dev;
const struct lpddr2_addressing *addressing;
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 spinlock_t emif_lock;
static unsigned long irq_state;
static u32 t_ck; /* DDR clock period in ps */
static LIST_HEAD(device_list);
#ifdef CONFIG_DEBUG_FS
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_printf(s, "\n");
}
return 0;
}
static int emif_regdump_open(struct inode *inode, struct file *file)
{
return single_open(file, emif_regdump_show, inode->i_private);
}
static const struct file_operations emif_regdump_fops = {
.open = emif_regdump_open,
.read = seq_read,
.release = single_release,
};
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;
}
static int emif_mr4_open(struct inode *inode, struct file *file)
{
return single_open(file, emif_mr4_show, inode->i_private);
}
static const struct file_operations emif_mr4_fops = {
.open = emif_mr4_open,
.read = seq_read,
.release = single_release,
};
static int __init_or_module emif_debugfs_init(struct emif_data *emif)
{
struct dentry *dentry;
int ret;
dentry = debugfs_create_dir(dev_name(emif->dev), NULL);
if (!dentry) {
ret = -ENOMEM;
goto err0;
}
emif->debugfs_root = dentry;
dentry = debugfs_create_file("regcache_dump", S_IRUGO,
emif->debugfs_root, emif, &emif_regdump_fops);
if (!dentry) {
ret = -ENOMEM;
goto err1;
}
dentry = debugfs_create_file("mr4", S_IRUGO,
emif->debugfs_root, emif, &emif_mr4_fops);
if (!dentry) {
ret = -ENOMEM;
goto err1;
}
return 0;
err1:
debugfs_remove_recursive(emif->debugfs_root);
err0:
return ret;
}
static void __exit emif_debugfs_exit(struct emif_data *emif)
{
debugfs_remove_recursive(emif->debugfs_root);
emif->debugfs_root = NULL;
}
#else
static inline int __init_or_module emif_debugfs_init(struct emif_data *emif)
{
return 0;
}
static inline void __exit emif_debugfs_exit(struct emif_data *emif)
{
}
#endif
/*
* Calculate the period of DDR clock from frequency value
*/
static void set_ddr_clk_period(u32 freq)
{
/* Divide 10^12 by frequency to get period in ps */
t_ck = (u32)DIV_ROUND_UP_ULL(1000000000000ull, freq);
}
/*
* 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;
}
/*
* Get the CL from SDRAM_CONFIG register
*/
static u32 get_cl(struct emif_data *emif)
{
u32 cl;
void __iomem *base = emif->base;
cl = (readl(base + EMIF_SDRAM_CONFIG) & CL_MASK) >> CL_SHIFT;
return cl;
}
static void set_lpmode(struct emif_data *emif, u8 lpmode)
{
u32 temp;
void __iomem *base = emif->base;
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];
}
/*
* Find the the right timing table from the array of timing
* tables of the device using DDR clock frequency
*/
static const struct lpddr2_timings *get_timings_table(struct emif_data *emif,
u32 freq)
{
u32 i, min, max, freq_nearest;
const struct lpddr2_timings *timings = NULL;
const struct lpddr2_timings *timings_arr = emif->plat_data->timings;
struct device *dev = emif->dev;
/* Start with a very high frequency - 1GHz */
freq_nearest = 1000000000;
/*
* Find the timings table such that:
* 1. the frequency range covers the required frequency(safe) AND
* 2. the max_freq is closest to the required frequency(optimal)
*/
for (i = 0; i < emif->plat_data->timings_arr_size; i++) {
max = timings_arr[i].max_freq;
min = timings_arr[i].min_freq;
if ((freq >= min) && (freq <= max) && (max < freq_nearest)) {
freq_nearest = max;
timings = &timings_arr[i];
}
}
if (!timings)
dev_err(dev, "%s: couldn't find timings for - %dHz\n",
__func__, freq);
dev_dbg(dev, "%s: timings table: freq %d, speed bin freq %d\n",
__func__, freq, freq_nearest);
return timings;
}
static u32 get_sdram_ref_ctrl_shdw(u32 freq,
const struct lpddr2_addressing *addressing)
{
u32 ref_ctrl_shdw = 0, val = 0, freq_khz, t_refi;
/* Scale down frequency and t_refi to avoid overflow */
freq_khz = freq / 1000;
t_refi = addressing->tREFI_ns / 100;
/*
* refresh rate to be set is 'tREFI(in us) * freq in MHz
* division by 10000 to account for change in units
*/
val = t_refi * freq_khz / 10000;
ref_ctrl_shdw |= val << REFRESH_RATE_SHIFT;
return ref_ctrl_shdw;
}
static u32 get_sdram_tim_1_shdw(const struct lpddr2_timings *timings,
const struct lpddr2_min_tck *min_tck,
const struct lpddr2_addressing *addressing)
{
u32 tim1 = 0, val = 0;
val = max(min_tck->tWTR, DIV_ROUND_UP(timings->tWTR, t_ck)) - 1;
tim1 |= val << T_WTR_SHIFT;
if (addressing->num_banks == B8)
val = DIV_ROUND_UP(timings->tFAW, t_ck*4);
else
val = max(min_tck->tRRD, DIV_ROUND_UP(timings->tRRD, t_ck));
tim1 |= (val - 1) << T_RRD_SHIFT;
val = DIV_ROUND_UP(timings->tRAS_min + timings->tRPab, t_ck) - 1;
tim1 |= val << T_RC_SHIFT;
val = max(min_tck->tRASmin, DIV_ROUND_UP(timings->tRAS_min, t_ck));
tim1 |= (val - 1) << T_RAS_SHIFT;
val = max(min_tck->tWR, DIV_ROUND_UP(timings->tWR, t_ck)) - 1;
tim1 |= val << T_WR_SHIFT;
val = max(min_tck->tRCD, DIV_ROUND_UP(timings->tRCD, t_ck)) - 1;
tim1 |= val << T_RCD_SHIFT;
val = max(min_tck->tRPab, DIV_ROUND_UP(timings->tRPab, t_ck)) - 1;
tim1 |= val << T_RP_SHIFT;
return tim1;
}
static u32 get_sdram_tim_1_shdw_derated(const struct lpddr2_timings *timings,
const struct lpddr2_min_tck *min_tck,
const struct lpddr2_addressing *addressing)
{
u32 tim1 = 0, val = 0;
val = max(min_tck->tWTR, DIV_ROUND_UP(timings->tWTR, t_ck)) - 1;
tim1 = val << T_WTR_SHIFT;
/*
* tFAW is approximately 4 times tRRD. So add 1875*4 = 7500ps
* to tFAW for de-rating
*/
if (addressing->num_banks == B8) {
val = DIV_ROUND_UP(timings->tFAW + 7500, 4 * t_ck) - 1;
} else {
val = DIV_ROUND_UP(timings->tRRD + 1875, t_ck);
val = max(min_tck->tRRD, val) - 1;
}
tim1 |= val << T_RRD_SHIFT;
val = DIV_ROUND_UP(timings->tRAS_min + timings->tRPab + 1875, t_ck);
tim1 |= (val - 1) << T_RC_SHIFT;
val = DIV_ROUND_UP(timings->tRAS_min + 1875, t_ck);
val = max(min_tck->tRASmin, val) - 1;
tim1 |= val << T_RAS_SHIFT;
val = max(min_tck->tWR, DIV_ROUND_UP(timings->tWR, t_ck)) - 1;
tim1 |= val << T_WR_SHIFT;
val = max(min_tck->tRCD, DIV_ROUND_UP(timings->tRCD + 1875, t_ck));
tim1 |= (val - 1) << T_RCD_SHIFT;
val = max(min_tck->tRPab, DIV_ROUND_UP(timings->tRPab + 1875, t_ck));
tim1 |= (val - 1) << T_RP_SHIFT;
return tim1;
}
static u32 get_sdram_tim_2_shdw(const struct lpddr2_timings *timings,
const struct lpddr2_min_tck *min_tck,
const struct lpddr2_addressing *addressing,
u32 type)
{
u32 tim2 = 0, val = 0;
val = min_tck->tCKE - 1;
tim2 |= val << T_CKE_SHIFT;
val = max(min_tck->tRTP, DIV_ROUND_UP(timings->tRTP, t_ck)) - 1;
tim2 |= val << T_RTP_SHIFT;
/* tXSNR = tRFCab_ps + 10 ns(tRFCab_ps for LPDDR2). */
val = DIV_ROUND_UP(addressing->tRFCab_ps + 10000, t_ck) - 1;
tim2 |= val << T_XSNR_SHIFT;
/* XSRD same as XSNR for LPDDR2 */
tim2 |= val << T_XSRD_SHIFT;
val = max(min_tck->tXP, DIV_ROUND_UP(timings->tXP, t_ck)) - 1;
tim2 |= val << T_XP_SHIFT;
return tim2;
}
static u32 get_sdram_tim_3_shdw(const struct lpddr2_timings *timings,
const struct lpddr2_min_tck *min_tck,
const struct lpddr2_addressing *addressing,
u32 type, u32 ip_rev, u32 derated)
{
u32 tim3 = 0, val = 0, t_dqsck;
val = timings->tRAS_max_ns / addressing->tREFI_ns - 1;
val = val > 0xF ? 0xF : val;
tim3 |= val << T_RAS_MAX_SHIFT;
val = DIV_ROUND_UP(addressing->tRFCab_ps, t_ck) - 1;
tim3 |= val << T_RFC_SHIFT;
t_dqsck = (derated == EMIF_DERATED_TIMINGS) ?
timings->tDQSCK_max_derated : timings->tDQSCK_max;
if (ip_rev == EMIF_4D5)
val = DIV_ROUND_UP(t_dqsck + 1000, t_ck) - 1;
else
val = DIV_ROUND_UP(t_dqsck, t_ck) - 1;
tim3 |= val << T_TDQSCKMAX_SHIFT;
val = DIV_ROUND_UP(timings->tZQCS, t_ck) - 1;
tim3 |= val << ZQ_ZQCS_SHIFT;
val = DIV_ROUND_UP(timings->tCKESR, t_ck);
val = max(min_tck->tCKESR, val) - 1;
tim3 |= val << T_CKESR_SHIFT;
if (ip_rev == EMIF_4D5) {
tim3 |= (EMIF_T_CSTA - 1) << T_CSTA_SHIFT;
val = DIV_ROUND_UP(EMIF_T_PDLL_UL, 128) - 1;
tim3 |= val << T_PDLL_UL_SHIFT;
}
return tim3;
}
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_read_idle_ctrl_shdw(u8 volt_ramp)
{
u32 idle = 0, val = 0;
/*
* Maximum value in normal conditions and increased frequency
* when voltage is ramping
*/
if (volt_ramp)
val = READ_IDLE_INTERVAL_DVFS / t_ck / 64 - 1;
else
val = 0x1FF;
/*
* READ_IDLE_CTRL register in EMIF4D has same offset and fields
* as DLL_CALIB_CTRL in EMIF4D5, so use the same shifts
*/
idle |= val << DLL_CALIB_INTERVAL_SHIFT;
idle |= EMIF_READ_IDLE_LEN_VAL << ACK_WAIT_SHIFT;
return idle;
}
static u32 get_dll_calib_ctrl_shdw(u8 volt_ramp)
{
u32 calib = 0, val = 0;
if (volt_ramp == DDR_VOLTAGE_RAMPING)
val = DLL_CALIB_INTERVAL_DVFS / t_ck / 16 - 1;
else
val = 0; /* Disabled when voltage is stable */
calib |= val << DLL_CALIB_INTERVAL_SHIFT;
calib |= DLL_CALIB_ACK_WAIT_VAL << ACK_WAIT_SHIFT;
return calib;
}
static u32 get_ddr_phy_ctrl_1_attilaphy_4d(const struct lpddr2_timings *timings,
u32 freq, u8 RL)
{
u32 phy = EMIF_DDR_PHY_CTRL_1_BASE_VAL_ATTILAPHY, val = 0;
val = RL + DIV_ROUND_UP(timings->tDQSCK_max, t_ck) - 1;
phy |= val << READ_LATENCY_SHIFT_4D;
if (freq <= 100000000)
val = EMIF_DLL_SLAVE_DLY_CTRL_100_MHZ_AND_LESS_ATTILAPHY;
else if (freq <= 200000000)
val = EMIF_DLL_SLAVE_DLY_CTRL_200_MHZ_ATTILAPHY;
else
val = EMIF_DLL_SLAVE_DLY_CTRL_400_MHZ_ATTILAPHY;
phy |= val << DLL_SLAVE_DLY_CTRL_SHIFT_4D;
return phy;
}
static u32 get_phy_ctrl_1_intelliphy_4d5(u32 freq, u8 cl)
{
u32 phy = EMIF_DDR_PHY_CTRL_1_BASE_VAL_INTELLIPHY, half_delay;
/*
* DLL operates at 266 MHz. If DDR frequency is near 266 MHz,
* half-delay is not needed else set half-delay
*/
if (freq >= 265000000 && freq < 267000000)
half_delay = 0;
else
half_delay = 1;
phy |= half_delay << DLL_HALF_DELAY_SHIFT_4D5;
phy |= ((cl + DIV_ROUND_UP(EMIF_PHY_TOTAL_READ_LATENCY_INTELLIPHY_PS,
t_ck) - 1) << READ_LATENCY_SHIFT_4D5);
return phy;
}
static u32 get_ext_phy_ctrl_2_intelliphy_4d5(void)
{
u32 fifo_we_slave_ratio;
fifo_we_slave_ratio = DIV_ROUND_CLOSEST(
EMIF_INTELLI_PHY_DQS_GATE_OPENING_DELAY_PS * 256 , t_ck);
return fifo_we_slave_ratio | fifo_we_slave_ratio << 11 |
fifo_we_slave_ratio << 22;
}
static u32 get_ext_phy_ctrl_3_intelliphy_4d5(void)
{
u32 fifo_we_slave_ratio;
fifo_we_slave_ratio = DIV_ROUND_CLOSEST(
EMIF_INTELLI_PHY_DQS_GATE_OPENING_DELAY_PS * 256 , t_ck);
return fifo_we_slave_ratio >> 10 | fifo_we_slave_ratio << 1 |
fifo_we_slave_ratio << 12 | fifo_we_slave_ratio << 23;
}
static u32 get_ext_phy_ctrl_4_intelliphy_4d5(void)
{
u32 fifo_we_slave_ratio;
fifo_we_slave_ratio = DIV_ROUND_CLOSEST(
EMIF_INTELLI_PHY_DQS_GATE_OPENING_DELAY_PS * 256 , t_ck);
return fifo_we_slave_ratio >> 9 | fifo_we_slave_ratio << 2 |
fifo_we_slave_ratio << 13;
}
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;
}
/*
* Program EMIF shadow registers that are not dependent on temperature
* or voltage
*/
static void setup_registers(struct emif_data *emif, struct emif_regs *regs)
{
void __iomem *base = emif->base;
writel(regs->sdram_tim2_shdw, base + EMIF_SDRAM_TIMING_2_SHDW);
writel(regs->phy_ctrl_1_shdw, base + EMIF_DDR_PHY_CTRL_1_SHDW);
writel(regs->pwr_mgmt_ctrl_shdw,
base + EMIF_POWER_MANAGEMENT_CTRL_SHDW);
/* Settings specific for EMIF4D5 */
if (emif->plat_data->ip_rev != EMIF_4D5)
return;
writel(regs->ext_phy_ctrl_2_shdw, base + EMIF_EXT_PHY_CTRL_2_SHDW);
writel(regs->ext_phy_ctrl_3_shdw, base + EMIF_EXT_PHY_CTRL_3_SHDW);
writel(regs->ext_phy_ctrl_4_shdw, base + EMIF_EXT_PHY_CTRL_4_SHDW);
}
/*
* When voltage ramps dll calibration and forced read idle should
* happen more often
*/
static void setup_volt_sensitive_regs(struct emif_data *emif,
struct emif_regs *regs, u32 volt_state)
{
u32 calib_ctrl;
void __iomem *base = emif->base;
/*
* EMIF_READ_IDLE_CTRL in EMIF4D refers to the same register as
* EMIF_DLL_CALIB_CTRL in EMIF4D5 and dll_calib_ctrl_shadow_*
* is an alias of the respective read_idle_ctrl_shdw_* (members of
* a union). So, the below code takes care of both cases
*/
if (volt_state == DDR_VOLTAGE_RAMPING)
calib_ctrl = regs->dll_calib_ctrl_shdw_volt_ramp;
else
calib_ctrl = regs->dll_calib_ctrl_shdw_normal;
writel(calib_ctrl, base + EMIF_DLL_CALIB_CTRL_SHDW);
}
/*
* 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 = IRQ_HANDLED;
struct emif_custom_configs *custom_configs;
spin_lock_irqsave(&emif_lock, irq_state);
old_temp_level = emif->temperature_level;
get_temperature_level(emif);
if (unlikely(emif->temperature_level == old_temp_level)) {
goto out;
} else if (!emif->curr_regs) {
dev_err(emif->dev, "temperature alert before registers are calculated, not de-rating timings\n");
goto out;
}
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;
ret = IRQ_WAKE_THREAD;
goto out;
}
}
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();
}
out:
spin_unlock_irqrestore(&emif_lock, irq_state);
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) {