| Message ID | 20201119140850.12268-5-grzegorz.jaszczyk@linaro.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add a PRU remoteproc driver | expand |
On Thu, Nov 19, 2020 at 03:08:48PM +0100, Grzegorz Jaszczyk wrote: > From: Suman Anna <s-anna@ti.com> > > 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> > --- > drivers/remoteproc/pru_rproc.c | 137 +++++++++++++++++++++++++++++++++ > 1 file changed, 137 insertions(+) > > diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > index c68c3d6bfddd..d5f04d77ad54 100644 > --- 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 { > 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 +115,125 @@ 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; > +} > + Here there is an extra line but below for DEFINE_SIMPLE_ATTRIBUTE() there isn't. Please pick a heuristic and stick with it. With that: Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> > +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, ®s_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--) { > @@ -573,6 +708,8 @@ 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; > -- > 2.29.0 >
Hi Mathieu, On Thu, 3 Dec 2020 at 19:21, Mathieu Poirier <mathieu.poirier@linaro.org> wrote: > > On Thu, Nov 19, 2020 at 03:08:48PM +0100, Grzegorz Jaszczyk wrote: > > From: Suman Anna <s-anna@ti.com> > > > > 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> > > --- > > drivers/remoteproc/pru_rproc.c | 137 +++++++++++++++++++++++++++++++++ > > 1 file changed, 137 insertions(+) > > > > diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > > index c68c3d6bfddd..d5f04d77ad54 100644 > > --- 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 { > > 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 +115,125 @@ 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; > > +} > > + > > Here there is an extra line but below for DEFINE_SIMPLE_ATTRIBUTE() there isn't. > Please pick a heuristic and stick with it. Sure, I will remove the extra line and therefore make it consistent. > > With that: > > Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Thank you, Grzegorz > > > +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, ®s_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--) { > > @@ -573,6 +708,8 @@ 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; > > -- > > 2.29.0 > >
diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index c68c3d6bfddd..d5f04d77ad54 100644 --- 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 { 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 +115,125 @@ 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, ®s_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--) { @@ -573,6 +708,8 @@ 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;