| Message ID | 20201114084613.13503-6-grzegorz.jaszczyk@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/6] dt-bindings: remoteproc: Add binding doc for PRU cores in the PRU-ICSS | expand |
Hi Greg, On 11/14/20 2:46 AM, Grzegorz Jaszczyk wrote: > From: Suman Anna <s-anna@ti.com> > > The K3 AM65x family of SoCs have the next generation of the PRU-ICSS > processor subsystem, commonly referred to as ICSSG. Each ICSSG processor > subsystem on AM65x SR1.0 contains two primary PRU cores and two new > auxiliary PRU cores called RTUs. The AM65x SR2.0 SoCs have a revised > ICSSG IP that is based off the subsequent IP revision used on J721E > SoCs. This IP instance has two new custom auxiliary PRU cores called > Transmit PRUs (Tx_PRUs) in addition to the existing PRUs and RTUs. > > Each RTU and Tx_PRU cores have their own dedicated IRAM (smaller than > a PRU), Control and debug feature sets, but is different in terms of > sub-modules integrated around it and does not have the full capabilities > associated with a PRU core. The RTU core is typically used to aid a > PRU core in accelerating data transfers, while the Tx_PRU cores is > normally used to control the TX L2 FIFO if enabled in Ethernet > applications. Both can also be used to run independent applications. > The RTU and Tx_PRU cores though share the same Data RAMs as the PRU > cores, so the memories have to be partitioned carefully between different > applications. The new cores also support a new sub-module called Task > Manager to support two different context thread executions. > > Enhance the existing PRU remoteproc driver to support these new PRU, RTU > and Tx PRU cores by using specific compatibles. The initial names for the > firmware images for each PRU core are retrieved from DT nodes, and can > be adjusted through sysfs if required. > > The PRU remoteproc driver has to be specifically modified to use a > custom memcpy function within its ELF loader implementation for these > new cores in order to overcome a limitation with copying data into each > of the core's IRAM memories. These memory ports support only 4-byte > writes, and any sub-word order byte writes clear out the remaining > bytes other than the bytes being written within the containing word. > The default ARM64 memcpy also cannot be used as it throws an exception > when the preferred 8-byte copy operation is attempted. This choice is > made by using a state flag that is set only on K3 SoCs. > > Signed-off-by: Suman Anna <s-anna@ti.com> > Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > --- > drivers/remoteproc/pru_rproc.c | 141 ++++++++++++++++++++++++++++++--- > 1 file changed, 132 insertions(+), 9 deletions(-) > > diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > index 33806ddcbd5d..04c9f07799e2 100644 > --- a/drivers/remoteproc/pru_rproc.c > +++ b/drivers/remoteproc/pru_rproc.c > @@ -46,9 +46,13 @@ > #define PRU_DEBUG_GPREG(x) (0x0000 + (x) * 4) > #define PRU_DEBUG_CT_REG(x) (0x0080 + (x) * 4) > > -/* PRU Core IRAM address masks */ > +/* PRU/RTU/Tx_PRU Core IRAM address masks */ > #define PRU0_IRAM_ADDR_MASK 0x34000 > #define PRU1_IRAM_ADDR_MASK 0x38000 > +#define RTU0_IRAM_ADDR_MASK 0x4000 > +#define RTU1_IRAM_ADDR_MASK 0x6000 > +#define TX_PRU0_IRAM_ADDR_MASK 0xa000 > +#define TX_PRU1_IRAM_ADDR_MASK 0xc000 > > /* PRU device addresses for various type of PRU RAMs */ > #define PRU_IRAM_DA 0 /* Instruction RAM */ > @@ -73,12 +77,38 @@ enum pru_iomem { > PRU_IOMEM_MAX, > }; > > +/** > + * enum pru_type - PRU core type identifier > + * > + * @PRU_TYPE_PRU: Programmable Real-time Unit > + * @PRU_TYPE_RTU: Auxiliary Programmable Real-Time Unit > + * @PRU_TYPE_TX_PRU: Transmit Programmable Real-Time Unit > + * @PRU_TYPE_MAX: just keep this one at the end > + */ > +enum pru_type { > + PRU_TYPE_PRU = 0, > + PRU_TYPE_RTU, > + PRU_TYPE_TX_PRU, > + PRU_TYPE_MAX, > +}; > + > +/** > + * struct pru_private_data - device data for a PRU core > + * @type: type of the PRU core (PRU, RTU, Tx_PRU) > + * @is_k3: flag used to identify the need for special load & event handling > + */ > +struct pru_private_data { > + enum pru_type type; > + unsigned int is_k3 : 1; > +}; > + > /** > * struct pru_rproc - PRU remoteproc structure > * @id: id of the PRU core within the PRUSS > * @dev: PRU core device pointer > * @pruss: back-reference to parent PRUSS structure > * @rproc: remoteproc pointer for this PRU core > + * @data: PRU core specific data > * @mem_regions: data for each of the PRU memory regions > * @fw_name: name of firmware image used during loading > * @mapped_irq: virtual interrupt numbers of created fw specific mapping > @@ -93,6 +123,7 @@ struct pru_rproc { > struct device *dev; > struct pruss *pruss; > struct rproc *rproc; > + const struct pru_private_data *data; > struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; > const char *fw_name; > int *mapped_irq; > @@ -318,11 +349,12 @@ static int pru_rproc_start(struct rproc *rproc) > { > struct device *dev = &rproc->dev; > struct pru_rproc *pru = rproc->priv; > + const char *names[PRU_TYPE_MAX] = { "PRU", "RTU", "Tx_PRU" }; > u32 val; > int ret; > > - dev_dbg(dev, "starting PRU%d: entry-point = 0x%llx\n", > - pru->id, (rproc->bootaddr >> 2)); > + dev_dbg(dev, "starting %s%d: entry-point = 0x%llx\n", > + names[pru->data->type], pru->id, (rproc->bootaddr >> 2)); > > ret = pru_handle_intrmap(rproc); > /* > @@ -344,9 +376,10 @@ static int pru_rproc_stop(struct rproc *rproc) > { > struct device *dev = &rproc->dev; > struct pru_rproc *pru = rproc->priv; > + const char *names[PRU_TYPE_MAX] = { "PRU", "RTU", "Tx_PRU" }; > u32 val; > > - dev_dbg(dev, "stopping PRU%d\n", pru->id); > + dev_dbg(dev, "stopping %s%d\n", names[pru->data->type], pru->id); > > val = pru_control_read_reg(pru, PRU_CTRL_CTRL); > val &= ~CTRL_CTRL_EN; > @@ -458,9 +491,53 @@ static struct rproc_ops pru_rproc_ops = { > .da_to_va = pru_rproc_da_to_va, > }; > > +/* > + * Custom memory copy implementation for ICSSG PRU/RTU Cores Please update this to add Tx_PRU as well to the list here and in the below description. > + * > + * The ICSSG PRU/RTU cores have a memory copying issue with IRAM memories, that > + * is not seen on previous generation SoCs. The data is reflected properly in > + * the IRAM memories only for integer (4-byte) copies. Any unaligned copies > + * result in all the other pre-existing bytes zeroed out within that 4-byte > + * boundary, thereby resulting in wrong text/code in the IRAMs. Also, the > + * IRAM memory port interface does not allow any 8-byte copies (as commonly > + * used by ARM64 memcpy implementation) and throws an exception. The DRAM > + * memory ports do not show this behavior. Use this custom copying function > + * to properly load the PRU/RTU firmware images on all memories for simplicity. This last line is obsolete now that we use regular memcpy for Data RAM copies. regards Suman > + */ > +static int pru_rproc_memcpy(void *dest, const void *src, size_t count) > +{ > + const int *s = src; > + int *d = dest; > + int size = count / 4; > + int *tmp_src = NULL; > + > + /* > + * TODO: relax limitation of 4-byte aligned dest addresses and copy > + * sizes > + */ > + if ((long)dest % 4 || count % 4) > + return -EINVAL; > + > + /* src offsets in ELF firmware image can be non-aligned */ > + if ((long)src % 4) { > + tmp_src = kmemdup(src, count, GFP_KERNEL); > + if (!tmp_src) > + return -ENOMEM; > + s = tmp_src; > + } > + > + while (size--) > + *d++ = *s++; > + > + kfree(tmp_src); > + > + return 0; > +} > + > static int > pru_rproc_load_elf_segments(struct rproc *rproc, const struct firmware *fw) > { > + struct pru_rproc *pru = rproc->priv; > struct device *dev = &rproc->dev; > struct elf32_hdr *ehdr; > struct elf32_phdr *phdr; > @@ -512,7 +589,17 @@ pru_rproc_load_elf_segments(struct rproc *rproc, const struct firmware *fw) > if (!phdr->p_filesz) > continue; > > - memcpy(ptr, elf_data + phdr->p_offset, filesz); > + if (pru->data->is_k3 && is_iram) { > + ret = pru_rproc_memcpy(ptr, elf_data + phdr->p_offset, > + filesz); > + if (ret) { > + dev_err(dev, "PRU memory copy failed for da 0x%x memsz 0x%x\n", > + da, memsz); > + break; > + } > + } else { > + memcpy(ptr, elf_data + phdr->p_offset, filesz); > + } > } > > return ret; > @@ -619,9 +706,17 @@ static int pru_rproc_set_id(struct pru_rproc *pru) > int ret = 0; > > switch (pru->mem_regions[PRU_IOMEM_IRAM].pa & 0x3ffff) { > + case TX_PRU0_IRAM_ADDR_MASK: > + fallthrough; > + case RTU0_IRAM_ADDR_MASK: > + fallthrough; > case PRU0_IRAM_ADDR_MASK: > pru->id = 0; > break; > + case TX_PRU1_IRAM_ADDR_MASK: > + fallthrough; > + case RTU1_IRAM_ADDR_MASK: > + fallthrough; > case PRU1_IRAM_ADDR_MASK: > pru->id = 1; > break; > @@ -642,8 +737,13 @@ static int pru_rproc_probe(struct platform_device *pdev) > struct rproc *rproc = NULL; > struct resource *res; > int i, ret; > + const struct pru_private_data *data; > const char *mem_names[PRU_IOMEM_MAX] = { "iram", "control", "debug" }; > > + data = of_device_get_match_data(&pdev->dev); > + if (!data) > + return -ENODEV; > + > ret = of_property_read_string(np, "firmware-name", &fw_name); > if (ret) { > dev_err(dev, "unable to retrieve firmware-name %d\n", ret); > @@ -676,6 +776,7 @@ static int pru_rproc_probe(struct platform_device *pdev) > > pru = rproc->priv; > pru->dev = dev; > + pru->data = data; > pru->pruss = platform_get_drvdata(ppdev); > pru->rproc = rproc; > pru->fw_name = fw_name; > @@ -727,11 +828,33 @@ static int pru_rproc_remove(struct platform_device *pdev) > return 0; > } > > +static const struct pru_private_data pru_data = { > + .type = PRU_TYPE_PRU, > +}; > + > +static const struct pru_private_data k3_pru_data = { > + .type = PRU_TYPE_PRU, > + .is_k3 = 1, > +}; > + > +static const struct pru_private_data k3_rtu_data = { > + .type = PRU_TYPE_RTU, > + .is_k3 = 1, > +}; > + > +static const struct pru_private_data k3_tx_pru_data = { > + .type = PRU_TYPE_TX_PRU, > + .is_k3 = 1, > +}; > + > static const struct of_device_id pru_rproc_match[] = { > - { .compatible = "ti,am3356-pru", }, > - { .compatible = "ti,am4376-pru", }, > - { .compatible = "ti,am5728-pru", }, > - { .compatible = "ti,k2g-pru", }, > + { .compatible = "ti,am3356-pru", .data = &pru_data }, > + { .compatible = "ti,am4376-pru", .data = &pru_data }, > + { .compatible = "ti,am5728-pru", .data = &pru_data }, > + { .compatible = "ti,k2g-pru", .data = &pru_data }, > + { .compatible = "ti,am654-pru", .data = &k3_pru_data }, > + { .compatible = "ti,am654-rtu", .data = &k3_rtu_data }, > + { .compatible = "ti,am654-tx-pru", .data = &k3_tx_pru_data }, > {}, > }; > MODULE_DEVICE_TABLE(of, pru_rproc_match); >
Hi Suman, On Tue, 17 Nov 2020 at 21:09, Suman Anna <s-anna@ti.com> wrote: > > Hi Greg, > > On 11/14/20 2:46 AM, Grzegorz Jaszczyk wrote: > > From: Suman Anna <s-anna@ti.com> > > > > The K3 AM65x family of SoCs have the next generation of the PRU-ICSS > > processor subsystem, commonly referred to as ICSSG. Each ICSSG processor > > subsystem on AM65x SR1.0 contains two primary PRU cores and two new > > auxiliary PRU cores called RTUs. The AM65x SR2.0 SoCs have a revised > > ICSSG IP that is based off the subsequent IP revision used on J721E > > SoCs. This IP instance has two new custom auxiliary PRU cores called > > Transmit PRUs (Tx_PRUs) in addition to the existing PRUs and RTUs. > > > > Each RTU and Tx_PRU cores have their own dedicated IRAM (smaller than > > a PRU), Control and debug feature sets, but is different in terms of > > sub-modules integrated around it and does not have the full capabilities > > associated with a PRU core. The RTU core is typically used to aid a > > PRU core in accelerating data transfers, while the Tx_PRU cores is > > normally used to control the TX L2 FIFO if enabled in Ethernet > > applications. Both can also be used to run independent applications. > > The RTU and Tx_PRU cores though share the same Data RAMs as the PRU > > cores, so the memories have to be partitioned carefully between different > > applications. The new cores also support a new sub-module called Task > > Manager to support two different context thread executions. > > > > Enhance the existing PRU remoteproc driver to support these new PRU, RTU > > and Tx PRU cores by using specific compatibles. The initial names for the > > firmware images for each PRU core are retrieved from DT nodes, and can > > be adjusted through sysfs if required. > > > > The PRU remoteproc driver has to be specifically modified to use a > > custom memcpy function within its ELF loader implementation for these > > new cores in order to overcome a limitation with copying data into each > > of the core's IRAM memories. These memory ports support only 4-byte > > writes, and any sub-word order byte writes clear out the remaining > > bytes other than the bytes being written within the containing word. > > The default ARM64 memcpy also cannot be used as it throws an exception > > when the preferred 8-byte copy operation is attempted. This choice is > > made by using a state flag that is set only on K3 SoCs. > > > > Signed-off-by: Suman Anna <s-anna@ti.com> > > Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > > Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > > --- > > drivers/remoteproc/pru_rproc.c | 141 ++++++++++++++++++++++++++++++--- > > 1 file changed, 132 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > > index 33806ddcbd5d..04c9f07799e2 100644 > > --- a/drivers/remoteproc/pru_rproc.c > > +++ b/drivers/remoteproc/pru_rproc.c > > @@ -46,9 +46,13 @@ > > #define PRU_DEBUG_GPREG(x) (0x0000 + (x) * 4) > > #define PRU_DEBUG_CT_REG(x) (0x0080 + (x) * 4) > > > > -/* PRU Core IRAM address masks */ > > +/* PRU/RTU/Tx_PRU Core IRAM address masks */ > > #define PRU0_IRAM_ADDR_MASK 0x34000 > > #define PRU1_IRAM_ADDR_MASK 0x38000 > > +#define RTU0_IRAM_ADDR_MASK 0x4000 > > +#define RTU1_IRAM_ADDR_MASK 0x6000 > > +#define TX_PRU0_IRAM_ADDR_MASK 0xa000 > > +#define TX_PRU1_IRAM_ADDR_MASK 0xc000 > > > > /* PRU device addresses for various type of PRU RAMs */ > > #define PRU_IRAM_DA 0 /* Instruction RAM */ > > @@ -73,12 +77,38 @@ enum pru_iomem { > > PRU_IOMEM_MAX, > > }; > > > > +/** > > + * enum pru_type - PRU core type identifier > > + * > > + * @PRU_TYPE_PRU: Programmable Real-time Unit > > + * @PRU_TYPE_RTU: Auxiliary Programmable Real-Time Unit > > + * @PRU_TYPE_TX_PRU: Transmit Programmable Real-Time Unit > > + * @PRU_TYPE_MAX: just keep this one at the end > > + */ > > +enum pru_type { > > + PRU_TYPE_PRU = 0, > > + PRU_TYPE_RTU, > > + PRU_TYPE_TX_PRU, > > + PRU_TYPE_MAX, > > +}; > > + > > +/** > > + * struct pru_private_data - device data for a PRU core > > + * @type: type of the PRU core (PRU, RTU, Tx_PRU) > > + * @is_k3: flag used to identify the need for special load & event handling > > + */ > > +struct pru_private_data { > > + enum pru_type type; > > + unsigned int is_k3 : 1; > > +}; > > + > > /** > > * struct pru_rproc - PRU remoteproc structure > > * @id: id of the PRU core within the PRUSS > > * @dev: PRU core device pointer > > * @pruss: back-reference to parent PRUSS structure > > * @rproc: remoteproc pointer for this PRU core > > + * @data: PRU core specific data > > * @mem_regions: data for each of the PRU memory regions > > * @fw_name: name of firmware image used during loading > > * @mapped_irq: virtual interrupt numbers of created fw specific mapping > > @@ -93,6 +123,7 @@ struct pru_rproc { > > struct device *dev; > > struct pruss *pruss; > > struct rproc *rproc; > > + const struct pru_private_data *data; > > struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; > > const char *fw_name; > > int *mapped_irq; > > @@ -318,11 +349,12 @@ static int pru_rproc_start(struct rproc *rproc) > > { > > struct device *dev = &rproc->dev; > > struct pru_rproc *pru = rproc->priv; > > + const char *names[PRU_TYPE_MAX] = { "PRU", "RTU", "Tx_PRU" }; > > u32 val; > > int ret; > > > > - dev_dbg(dev, "starting PRU%d: entry-point = 0x%llx\n", > > - pru->id, (rproc->bootaddr >> 2)); > > + dev_dbg(dev, "starting %s%d: entry-point = 0x%llx\n", > > + names[pru->data->type], pru->id, (rproc->bootaddr >> 2)); > > > > ret = pru_handle_intrmap(rproc); > > /* > > @@ -344,9 +376,10 @@ static int pru_rproc_stop(struct rproc *rproc) > > { > > struct device *dev = &rproc->dev; > > struct pru_rproc *pru = rproc->priv; > > + const char *names[PRU_TYPE_MAX] = { "PRU", "RTU", "Tx_PRU" }; > > u32 val; > > > > - dev_dbg(dev, "stopping PRU%d\n", pru->id); > > + dev_dbg(dev, "stopping %s%d\n", names[pru->data->type], pru->id); > > > > val = pru_control_read_reg(pru, PRU_CTRL_CTRL); > > val &= ~CTRL_CTRL_EN; > > @@ -458,9 +491,53 @@ static struct rproc_ops pru_rproc_ops = { > > .da_to_va = pru_rproc_da_to_va, > > }; > > > > +/* > > + * Custom memory copy implementation for ICSSG PRU/RTU Cores > > Please update this to add Tx_PRU as well to the list here and in the below > description. Sure. > > > + * > > + * The ICSSG PRU/RTU cores have a memory copying issue with IRAM memories, that > > + * is not seen on previous generation SoCs. The data is reflected properly in > > + * the IRAM memories only for integer (4-byte) copies. Any unaligned copies > > + * result in all the other pre-existing bytes zeroed out within that 4-byte > > + * boundary, thereby resulting in wrong text/code in the IRAMs. Also, the > > + * IRAM memory port interface does not allow any 8-byte copies (as commonly > > + * used by ARM64 memcpy implementation) and throws an exception. The DRAM > > + * memory ports do not show this behavior. Use this custom copying function > > + * to properly load the PRU/RTU firmware images on all memories for simplicity. > > This last line is obsolete now that we use regular memcpy for Data RAM copies. Yes you are right. I will remove the last sentence. Thank you, Grzegorz
diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index 33806ddcbd5d..04c9f07799e2 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -46,9 +46,13 @@ #define PRU_DEBUG_GPREG(x) (0x0000 + (x) * 4) #define PRU_DEBUG_CT_REG(x) (0x0080 + (x) * 4) -/* PRU Core IRAM address masks */ +/* PRU/RTU/Tx_PRU Core IRAM address masks */ #define PRU0_IRAM_ADDR_MASK 0x34000 #define PRU1_IRAM_ADDR_MASK 0x38000 +#define RTU0_IRAM_ADDR_MASK 0x4000 +#define RTU1_IRAM_ADDR_MASK 0x6000 +#define TX_PRU0_IRAM_ADDR_MASK 0xa000 +#define TX_PRU1_IRAM_ADDR_MASK 0xc000 /* PRU device addresses for various type of PRU RAMs */ #define PRU_IRAM_DA 0 /* Instruction RAM */ @@ -73,12 +77,38 @@ enum pru_iomem { PRU_IOMEM_MAX, }; +/** + * enum pru_type - PRU core type identifier + * + * @PRU_TYPE_PRU: Programmable Real-time Unit + * @PRU_TYPE_RTU: Auxiliary Programmable Real-Time Unit + * @PRU_TYPE_TX_PRU: Transmit Programmable Real-Time Unit + * @PRU_TYPE_MAX: just keep this one at the end + */ +enum pru_type { + PRU_TYPE_PRU = 0, + PRU_TYPE_RTU, + PRU_TYPE_TX_PRU, + PRU_TYPE_MAX, +}; + +/** + * struct pru_private_data - device data for a PRU core + * @type: type of the PRU core (PRU, RTU, Tx_PRU) + * @is_k3: flag used to identify the need for special load & event handling + */ +struct pru_private_data { + enum pru_type type; + unsigned int is_k3 : 1; +}; + /** * struct pru_rproc - PRU remoteproc structure * @id: id of the PRU core within the PRUSS * @dev: PRU core device pointer * @pruss: back-reference to parent PRUSS structure * @rproc: remoteproc pointer for this PRU core + * @data: PRU core specific data * @mem_regions: data for each of the PRU memory regions * @fw_name: name of firmware image used during loading * @mapped_irq: virtual interrupt numbers of created fw specific mapping @@ -93,6 +123,7 @@ struct pru_rproc { struct device *dev; struct pruss *pruss; struct rproc *rproc; + const struct pru_private_data *data; struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; const char *fw_name; int *mapped_irq; @@ -318,11 +349,12 @@ static int pru_rproc_start(struct rproc *rproc) { struct device *dev = &rproc->dev; struct pru_rproc *pru = rproc->priv; + const char *names[PRU_TYPE_MAX] = { "PRU", "RTU", "Tx_PRU" }; u32 val; int ret; - dev_dbg(dev, "starting PRU%d: entry-point = 0x%llx\n", - pru->id, (rproc->bootaddr >> 2)); + dev_dbg(dev, "starting %s%d: entry-point = 0x%llx\n", + names[pru->data->type], pru->id, (rproc->bootaddr >> 2)); ret = pru_handle_intrmap(rproc); /* @@ -344,9 +376,10 @@ static int pru_rproc_stop(struct rproc *rproc) { struct device *dev = &rproc->dev; struct pru_rproc *pru = rproc->priv; + const char *names[PRU_TYPE_MAX] = { "PRU", "RTU", "Tx_PRU" }; u32 val; - dev_dbg(dev, "stopping PRU%d\n", pru->id); + dev_dbg(dev, "stopping %s%d\n", names[pru->data->type], pru->id); val = pru_control_read_reg(pru, PRU_CTRL_CTRL); val &= ~CTRL_CTRL_EN; @@ -458,9 +491,53 @@ static struct rproc_ops pru_rproc_ops = { .da_to_va = pru_rproc_da_to_va, }; +/* + * Custom memory copy implementation for ICSSG PRU/RTU Cores + * + * The ICSSG PRU/RTU cores have a memory copying issue with IRAM memories, that + * is not seen on previous generation SoCs. The data is reflected properly in + * the IRAM memories only for integer (4-byte) copies. Any unaligned copies + * result in all the other pre-existing bytes zeroed out within that 4-byte + * boundary, thereby resulting in wrong text/code in the IRAMs. Also, the + * IRAM memory port interface does not allow any 8-byte copies (as commonly + * used by ARM64 memcpy implementation) and throws an exception. The DRAM + * memory ports do not show this behavior. Use this custom copying function + * to properly load the PRU/RTU firmware images on all memories for simplicity. + */ +static int pru_rproc_memcpy(void *dest, const void *src, size_t count) +{ + const int *s = src; + int *d = dest; + int size = count / 4; + int *tmp_src = NULL; + + /* + * TODO: relax limitation of 4-byte aligned dest addresses and copy + * sizes + */ + if ((long)dest % 4 || count % 4) + return -EINVAL; + + /* src offsets in ELF firmware image can be non-aligned */ + if ((long)src % 4) { + tmp_src = kmemdup(src, count, GFP_KERNEL); + if (!tmp_src) + return -ENOMEM; + s = tmp_src; + } + + while (size--) + *d++ = *s++; + + kfree(tmp_src); + + return 0; +} + static int pru_rproc_load_elf_segments(struct rproc *rproc, const struct firmware *fw) { + struct pru_rproc *pru = rproc->priv; struct device *dev = &rproc->dev; struct elf32_hdr *ehdr; struct elf32_phdr *phdr; @@ -512,7 +589,17 @@ pru_rproc_load_elf_segments(struct rproc *rproc, const struct firmware *fw) if (!phdr->p_filesz) continue; - memcpy(ptr, elf_data + phdr->p_offset, filesz); + if (pru->data->is_k3 && is_iram) { + ret = pru_rproc_memcpy(ptr, elf_data + phdr->p_offset, + filesz); + if (ret) { + dev_err(dev, "PRU memory copy failed for da 0x%x memsz 0x%x\n", + da, memsz); + break; + } + } else { + memcpy(ptr, elf_data + phdr->p_offset, filesz); + } } return ret; @@ -619,9 +706,17 @@ static int pru_rproc_set_id(struct pru_rproc *pru) int ret = 0; switch (pru->mem_regions[PRU_IOMEM_IRAM].pa & 0x3ffff) { + case TX_PRU0_IRAM_ADDR_MASK: + fallthrough; + case RTU0_IRAM_ADDR_MASK: + fallthrough; case PRU0_IRAM_ADDR_MASK: pru->id = 0; break; + case TX_PRU1_IRAM_ADDR_MASK: + fallthrough; + case RTU1_IRAM_ADDR_MASK: + fallthrough; case PRU1_IRAM_ADDR_MASK: pru->id = 1; break; @@ -642,8 +737,13 @@ static int pru_rproc_probe(struct platform_device *pdev) struct rproc *rproc = NULL; struct resource *res; int i, ret; + const struct pru_private_data *data; const char *mem_names[PRU_IOMEM_MAX] = { "iram", "control", "debug" }; + data = of_device_get_match_data(&pdev->dev); + if (!data) + return -ENODEV; + ret = of_property_read_string(np, "firmware-name", &fw_name); if (ret) { dev_err(dev, "unable to retrieve firmware-name %d\n", ret); @@ -676,6 +776,7 @@ static int pru_rproc_probe(struct platform_device *pdev) pru = rproc->priv; pru->dev = dev; + pru->data = data; pru->pruss = platform_get_drvdata(ppdev); pru->rproc = rproc; pru->fw_name = fw_name; @@ -727,11 +828,33 @@ static int pru_rproc_remove(struct platform_device *pdev) return 0; } +static const struct pru_private_data pru_data = { + .type = PRU_TYPE_PRU, +}; + +static const struct pru_private_data k3_pru_data = { + .type = PRU_TYPE_PRU, + .is_k3 = 1, +}; + +static const struct pru_private_data k3_rtu_data = { + .type = PRU_TYPE_RTU, + .is_k3 = 1, +}; + +static const struct pru_private_data k3_tx_pru_data = { + .type = PRU_TYPE_TX_PRU, + .is_k3 = 1, +}; + static const struct of_device_id pru_rproc_match[] = { - { .compatible = "ti,am3356-pru", }, - { .compatible = "ti,am4376-pru", }, - { .compatible = "ti,am5728-pru", }, - { .compatible = "ti,k2g-pru", }, + { .compatible = "ti,am3356-pru", .data = &pru_data }, + { .compatible = "ti,am4376-pru", .data = &pru_data }, + { .compatible = "ti,am5728-pru", .data = &pru_data }, + { .compatible = "ti,k2g-pru", .data = &pru_data }, + { .compatible = "ti,am654-pru", .data = &k3_pru_data }, + { .compatible = "ti,am654-rtu", .data = &k3_rtu_data }, + { .compatible = "ti,am654-tx-pru", .data = &k3_tx_pru_data }, {}, }; MODULE_DEVICE_TABLE(of, pru_rproc_match);