ptp_qoriq: support FIPER3

The FIPER3 (fixed interval period pulse generator) is supported on
DPAA2 and ENETC network controller hardware. This patch is to support
it in ptp_qoriq driver.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/ptp/ptp_qoriq.c b/drivers/ptp/ptp_qoriq.c
index c09c16b..beb5f74 100644 (file)
--- a/drivers/ptp/ptp_qoriq.c
+++ b/drivers/ptp/ptp_qoriq.c
@@ -72,6 +72,10 @@ static void set_fipers(struct ptp_qoriq *ptp_qoriq)
        set_alarm(ptp_qoriq);
        ptp_qoriq->write(&regs->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
        ptp_qoriq->write(&regs->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);
+
+       if (ptp_qoriq->fiper3_support)
+               ptp_qoriq->write(&regs->fiper_regs->tmr_fiper3,
+                                ptp_qoriq->tmr_fiper3);
 }
 
 int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, bool update_event)
@@ -366,6 +370,7 @@ static u32 ptp_qoriq_nominal_freq(u32 clk_src)
  *   "fsl,tmr-add"
  *   "fsl,tmr-fiper1"
  *   "fsl,tmr-fiper2"
+ *   "fsl,tmr-fiper3" (required only for DPAA2 and ENETC hardware)
  *   "fsl,max-adj"
  *
  * Return 0 if success
@@ -412,6 +417,7 @@ static int ptp_qoriq_auto_config(struct ptp_qoriq *ptp_qoriq,
        ptp_qoriq->tmr_add = freq_comp;
        ptp_qoriq->tmr_fiper1 = DEFAULT_FIPER1_PERIOD - ptp_qoriq->tclk_period;
        ptp_qoriq->tmr_fiper2 = DEFAULT_FIPER2_PERIOD - ptp_qoriq->tclk_period;
+       ptp_qoriq->tmr_fiper3 = DEFAULT_FIPER3_PERIOD - ptp_qoriq->tclk_period;
 
        /* max_adj = 1000000000 * (freq_ratio - 1.0) - 1
         * freq_ratio = reference_clock_freq / nominal_freq
@@ -446,6 +452,10 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base,
        else
                ptp_qoriq->extts_fifo_support = false;
 
+       if (of_device_is_compatible(node, "fsl,dpaa2-ptp") ||
+           of_device_is_compatible(node, "fsl,enetc-ptp"))
+               ptp_qoriq->fiper3_support = true;
+
        if (of_property_read_u32(node,
                                 "fsl,tclk-period", &ptp_qoriq->tclk_period) ||
            of_property_read_u32(node,
@@ -457,7 +467,10 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base,
            of_property_read_u32(node,
                                 "fsl,tmr-fiper2", &ptp_qoriq->tmr_fiper2) ||
            of_property_read_u32(node,
-                                "fsl,max-adj", &ptp_qoriq->caps.max_adj)) {
+                                "fsl,max-adj", &ptp_qoriq->caps.max_adj) ||
+           (ptp_qoriq->fiper3_support &&
+            of_property_read_u32(node, "fsl,tmr-fiper3",
+                                 &ptp_qoriq->tmr_fiper3))) {
                pr_warn("device tree node missing required elements, try automatic configuration\n");
 
                if (ptp_qoriq_auto_config(ptp_qoriq, node))
@@ -502,6 +515,11 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base,
        ptp_qoriq->write(&regs->ctrl_regs->tmr_prsc, ptp_qoriq->tmr_prsc);
        ptp_qoriq->write(&regs->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
        ptp_qoriq->write(&regs->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);
+
+       if (ptp_qoriq->fiper3_support)
+               ptp_qoriq->write(&regs->fiper_regs->tmr_fiper3,
+                                ptp_qoriq->tmr_fiper3);
+
        set_alarm(ptp_qoriq);
        ptp_qoriq->write(&regs->ctrl_regs->tmr_ctrl,
                         tmr_ctrl|FIPERST|RTPE|TE|FRD);

diff --git a/include/linux/fsl/ptp_qoriq.h b/include/linux/fsl/ptp_qoriq.h
index 884b8f8..01acebe 100644 (file)
--- a/include/linux/fsl/ptp_qoriq.h
+++ b/include/linux/fsl/ptp_qoriq.h
@@ -136,6 +136,7 @@ struct ptp_qoriq_registers {
 #define DEFAULT_TMR_PRSC       2
 #define DEFAULT_FIPER1_PERIOD  1000000000
 #define DEFAULT_FIPER2_PERIOD  1000000000
+#define DEFAULT_FIPER3_PERIOD  1000000000
 
 struct ptp_qoriq {
        void __iomem *base;
@@ -147,6 +148,7 @@ struct ptp_qoriq {
        struct dentry *debugfs_root;
        struct device *dev;
        bool extts_fifo_support;
+       bool fiper3_support;
        int irq;
        int phc_index;
        u32 tclk_period;  /* nanoseconds */
@@ -155,6 +157,7 @@ struct ptp_qoriq {
        u32 cksel;
        u32 tmr_fiper1;
        u32 tmr_fiper2;
+       u32 tmr_fiper3;
        u32 (*read)(unsigned __iomem *addr);
        void (*write)(unsigned __iomem *addr, u32 val);
 };