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>

1 files changed, 148 insertions, 0 deletions

diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c
index a8dcf3515573..3dfffbb8ab40 100644
--- a/drivers/memory/emif.c
+++ b/drivers/memory/emif.c
@@ -78,6 +78,24 @@ static void set_ddr_clk_period(u32 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)
@@ -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);