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memory: emif: add one-time settings 

Add settings that are not dependent on frequency
or any other transient parameters. This includes
- power managment control init
- impedence calibration control
- frequency independent phy configuration registers
- initialization of temperature polling

Signed-off-by: Aneesh V <aneesh@ti.com>
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Benoit Cousson <b-cousson@ti.com>
[santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc]
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aneesh V 2012-04-27 17:54:08 +05:30 committed by Greg Kroah-Hartman
parent 68b4aee35d
commit 98231c4fc3
1 changed files with 148 additions and 0 deletions
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148
drivers/memory/emif.c
View File

@ -77,6 +77,24 @@ static void set_ddr_clk_period(u32 freq)
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
*/
@ -372,6 +390,70 @@ static u32 get_sdram_tim_3_shdw(const struct lpddr2_timings *timings,
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;
@ -815,6 +897,71 @@ static int __init_or_module setup_interrupts(struct emif_data *emif, u32 irq)
}
static void __init_or_module 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;
@ -1027,6 +1174,7 @@ static int __init_or_module emif_probe(struct platform_device *pdev)
goto error;
}
emif_onetime_settings(emif);
disable_and_clear_all_interrupts(emif);
setup_interrupts(emif, irq);