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soc: ti: pruss: Add support for PRU-ICSSs on AM437x SoCs
The AM437x SoCs have two different PRU-ICSS subsystems: PRU-ICSS1 and a smaller PRU-ICSS0. Enhance the PRUSS platform driver to support both the PRU-ICSS sub-systems on these SoCs. The PRU-ICSS1 on AM437x is very similar to the PRU-ICSS on AM33xx except for few minor differences - increased Instruction RAM, increased Shared Data RAM2, and 1 less interrupt (PRUSS host interrupt 7 which is redirected to the other PRUSS) towards the MPU INTC. The PRU-ICSS0 is a cut-down version of the IP, with less DRAM per PRU, no Shared DRAM etc. It also does not have direct access to L3 bus regions, there is a single interface to L3 for both PRUSS0 and PRUSS1, and it would have to go through the PRUSS1's interface. The PRUSS_SYSCFG register is reserved on PRUSS0, so any external access requires the programming the corresponding PRUSS_SYSCFG register in PRUSS1. It does have its own dedicated I/O lines though. Note that this instance does not support any PRU Ethernet related use cases. The adaptation uses SoC-specific compatibles in the driver and uses a newly introduced pruss_match_private_data structure and the pruss_get_private_data() function to retrieve a PRUSS instance specific data using a device-name based lookup logic. The reset and the L3 external access are managed by the parent interconnect ti-sysc bus driver so that PRUSS1 and PRUSS0 can be independently supported. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
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parent
dc1129564a
commit
78251639d3
2 changed files with 35 additions and 2 deletions
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@ -103,7 +103,7 @@ config TI_K3_SOCINFO
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config TI_PRUSS
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tristate "TI PRU-ICSS Subsystem Platform drivers"
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depends on SOC_AM33XX
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depends on SOC_AM33XX || SOC_AM43XX
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select MFD_SYSCON
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help
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TI PRU-ICSS Subsystem platform specific support.
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@ -17,6 +17,14 @@
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#include <linux/pm_runtime.h>
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#include <linux/pruss_driver.h>
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/**
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* struct pruss_private_data - PRUSS driver private data
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* @has_no_sharedram: flag to indicate the absence of PRUSS Shared Data RAM
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*/
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struct pruss_private_data {
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bool has_no_sharedram;
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};
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static int pruss_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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@ -25,8 +33,15 @@ static int pruss_probe(struct platform_device *pdev)
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struct pruss *pruss;
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struct resource res;
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int ret, i, index;
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const struct pruss_private_data *data;
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const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };
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data = of_device_get_match_data(&pdev->dev);
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if (IS_ERR(data)) {
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dev_err(dev, "missing private data\n");
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return -ENODEV;
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}
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ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
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if (ret) {
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dev_err(dev, "failed to set the DMA coherent mask");
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@ -45,7 +60,14 @@ static int pruss_probe(struct platform_device *pdev)
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return -ENODEV;
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}
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for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
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for (i = 0; i < PRUSS_MEM_MAX; i++) {
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/*
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* On AM437x one of two PRUSS units don't contain Shared RAM,
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* skip it
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*/
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if (data && data->has_no_sharedram && i == PRUSS_MEM_SHRD_RAM2)
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continue;
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index = of_property_match_string(child, "reg-names",
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mem_names[i]);
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if (index < 0) {
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@ -126,8 +148,19 @@ static int pruss_remove(struct platform_device *pdev)
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return 0;
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}
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/* instance-specific driver private data */
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static const struct pruss_private_data am437x_pruss1_data = {
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.has_no_sharedram = false,
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};
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static const struct pruss_private_data am437x_pruss0_data = {
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.has_no_sharedram = true,
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};
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static const struct of_device_id pruss_of_match[] = {
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{ .compatible = "ti,am3356-pruss" },
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{ .compatible = "ti,am4376-pruss0", .data = &am437x_pruss0_data, },
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{ .compatible = "ti,am4376-pruss1", .data = &am437x_pruss1_data, },
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{},
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};
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MODULE_DEVICE_TABLE(of, pruss_of_match);
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