remoteproc: pru: Add pru-specific debugfs support

The remoteproc core creates certain standard debugfs entries,
that does not give a whole lot of useful information for the
PRUs. The PRU remoteproc driver is enhanced to add additional
debugfs entries for PRU. These will be auto-cleaned up when
the parent rproc debug directory is removed.

The enhanced debugfs support adds two new entries: 'regs' and
'single_step'. The 'regs' dumps out the useful CTRL sub-module
registers as well as each of the 32 GPREGs and CT_REGs registers.
The GPREGs and CT_REGs though are printed only when the PRU is
halted and accessible as per the IP design.

The 'single_step' utilizes the single-step execution of the PRU
cores. Writing a non-zero value performs a single step, and a
zero value restores the PRU to execute in the same mode as the
mode before the first single step. (note: if the PRU is halted
because of a halt instruction, then no change occurs).

Logic for setting the PC and jumping over a halt instruction shall
be added in the future.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20201208141002.17777-5-grzegorz.jaszczyk@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index 72e64d1..59240fd 100644 (file)
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -11,6 +11,7 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/debugfs.h>
 #include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
@@ -25,6 +26,13 @@
 /* PRU_ICSS_PRU_CTRL registers */
 #define PRU_CTRL_CTRL          0x0000
 #define PRU_CTRL_STS           0x0004
+#define PRU_CTRL_WAKEUP_EN     0x0008
+#define PRU_CTRL_CYCLE         0x000C
+#define PRU_CTRL_STALL         0x0010
+#define PRU_CTRL_CTBIR0                0x0020
+#define PRU_CTRL_CTBIR1                0x0024
+#define PRU_CTRL_CTPPR0                0x0028
+#define PRU_CTRL_CTPPR1                0x002C
 
 /* CTRL register bit-fields */
 #define CTRL_CTRL_SOFT_RST_N   BIT(0)
@@ -34,6 +42,10 @@
 #define CTRL_CTRL_SINGLE_STEP  BIT(8)
 #define CTRL_CTRL_RUNSTATE     BIT(15)
 
+/* PRU_ICSS_PRU_DEBUG registers */
+#define PRU_DEBUG_GPREG(x)     (0x0000 + (x) * 4)
+#define PRU_DEBUG_CT_REG(x)    (0x0080 + (x) * 4)
+
 /* PRU Core IRAM address masks */
 #define PRU_IRAM_ADDR_MASK     0x3ffff
 #define PRU0_IRAM_ADDR_MASK    0x34000
@@ -73,6 +85,8 @@ enum pru_iomem {
  * @mapped_irq: virtual interrupt numbers of created fw specific mapping
  * @pru_interrupt_map: pointer to interrupt mapping description (firmware)
  * @pru_interrupt_map_sz: pru_interrupt_map size
+ * @dbg_single_step: debug state variable to set PRU into single step mode
+ * @dbg_continuous: debug state variable to restore PRU execution mode
  * @evt_count: number of mapped events
  */
 struct pru_rproc {
@@ -85,6 +99,8 @@ struct pru_rproc {
        unsigned int *mapped_irq;
        struct pru_irq_rsc *pru_interrupt_map;
        size_t pru_interrupt_map_sz;
+       u32 dbg_single_step;
+       u32 dbg_continuous;
        u8 evt_count;
 };
 
@@ -99,6 +115,124 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val)
        writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg);
 }
 
+static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg)
+{
+       return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg);
+}
+
+static int regs_show(struct seq_file *s, void *data)
+{
+       struct rproc *rproc = s->private;
+       struct pru_rproc *pru = rproc->priv;
+       int i, nregs = 32;
+       u32 pru_sts;
+       int pru_is_running;
+
+       seq_puts(s, "============== Control Registers ==============\n");
+       seq_printf(s, "CTRL      := 0x%08x\n",
+                  pru_control_read_reg(pru, PRU_CTRL_CTRL));
+       pru_sts = pru_control_read_reg(pru, PRU_CTRL_STS);
+       seq_printf(s, "STS (PC)  := 0x%08x (0x%08x)\n", pru_sts, pru_sts << 2);
+       seq_printf(s, "WAKEUP_EN := 0x%08x\n",
+                  pru_control_read_reg(pru, PRU_CTRL_WAKEUP_EN));
+       seq_printf(s, "CYCLE     := 0x%08x\n",
+                  pru_control_read_reg(pru, PRU_CTRL_CYCLE));
+       seq_printf(s, "STALL     := 0x%08x\n",
+                  pru_control_read_reg(pru, PRU_CTRL_STALL));
+       seq_printf(s, "CTBIR0    := 0x%08x\n",
+                  pru_control_read_reg(pru, PRU_CTRL_CTBIR0));
+       seq_printf(s, "CTBIR1    := 0x%08x\n",
+                  pru_control_read_reg(pru, PRU_CTRL_CTBIR1));
+       seq_printf(s, "CTPPR0    := 0x%08x\n",
+                  pru_control_read_reg(pru, PRU_CTRL_CTPPR0));
+       seq_printf(s, "CTPPR1    := 0x%08x\n",
+                  pru_control_read_reg(pru, PRU_CTRL_CTPPR1));
+
+       seq_puts(s, "=============== Debug Registers ===============\n");
+       pru_is_running = pru_control_read_reg(pru, PRU_CTRL_CTRL) &
+                               CTRL_CTRL_RUNSTATE;
+       if (pru_is_running) {
+               seq_puts(s, "PRU is executing, cannot print/access debug registers.\n");
+               return 0;
+       }
+
+       for (i = 0; i < nregs; i++) {
+               seq_printf(s, "GPREG%-2d := 0x%08x\tCT_REG%-2d := 0x%08x\n",
+                          i, pru_debug_read_reg(pru, PRU_DEBUG_GPREG(i)),
+                          i, pru_debug_read_reg(pru, PRU_DEBUG_CT_REG(i)));
+       }
+
+       return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(regs);
+
+/*
+ * Control PRU single-step mode
+ *
+ * This is a debug helper function used for controlling the single-step
+ * mode of the PRU. The PRU Debug registers are not accessible when the
+ * PRU is in RUNNING state.
+ *
+ * Writing a non-zero value sets the PRU into single-step mode irrespective
+ * of its previous state. The PRU mode is saved only on the first set into
+ * a single-step mode. Writing a zero value will restore the PRU into its
+ * original mode.
+ */
+static int pru_rproc_debug_ss_set(void *data, u64 val)
+{
+       struct rproc *rproc = data;
+       struct pru_rproc *pru = rproc->priv;
+       u32 reg_val;
+
+       val = val ? 1 : 0;
+       if (!val && !pru->dbg_single_step)
+               return 0;
+
+       reg_val = pru_control_read_reg(pru, PRU_CTRL_CTRL);
+
+       if (val && !pru->dbg_single_step)
+               pru->dbg_continuous = reg_val;
+
+       if (val)
+               reg_val |= CTRL_CTRL_SINGLE_STEP | CTRL_CTRL_EN;
+       else
+               reg_val = pru->dbg_continuous;
+
+       pru->dbg_single_step = val;
+       pru_control_write_reg(pru, PRU_CTRL_CTRL, reg_val);
+
+       return 0;
+}
+
+static int pru_rproc_debug_ss_get(void *data, u64 *val)
+{
+       struct rproc *rproc = data;
+       struct pru_rproc *pru = rproc->priv;
+
+       *val = pru->dbg_single_step;
+
+       return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(pru_rproc_debug_ss_fops, pru_rproc_debug_ss_get,
+                       pru_rproc_debug_ss_set, "%llu\n");
+
+/*
+ * Create PRU-specific debugfs entries
+ *
+ * The entries are created only if the parent remoteproc debugfs directory
+ * exists, and will be cleaned up by the remoteproc core.
+ */
+static void pru_rproc_create_debug_entries(struct rproc *rproc)
+{
+       if (!rproc->dbg_dir)
+               return;
+
+       debugfs_create_file("regs", 0400, rproc->dbg_dir,
+                           rproc, &regs_fops);
+       debugfs_create_file("single_step", 0600, rproc->dbg_dir,
+                           rproc, &pru_rproc_debug_ss_fops);
+}
+
 static void pru_dispose_irq_mapping(struct pru_rproc *pru)
 {
        while (pru->evt_count--) {
@@ -572,6 +706,8 @@ static int pru_rproc_probe(struct platform_device *pdev)
                return ret;
        }
 
+       pru_rproc_create_debug_entries(rproc);
+
        dev_dbg(dev, "PRU rproc node %pOF probed successfully\n", np);
 
        return 0;