^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * omap-ocp2scp.c - transform ocp interface protocol to scp protocol
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Kishon Vijay Abraham I <kishon@ti.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define OCP2SCP_TIMING 0x18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define SYNC2_MASK 0xf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static int ocp2scp_remove_devices(struct device *dev, void *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct platform_device *pdev = to_platform_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) platform_device_unregister(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static int omap_ocp2scp_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) u32 reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) void __iomem *regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) if (np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) "failed to add resources for ocp2scp child\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) goto err0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) pm_runtime_enable(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * As per AM572x TRM: http://www.ti.com/lit/ug/spruhz6/spruhz6.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * under section 26.3.2.2, table 26-26 OCP2SCP TIMING Caution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * As per OMAP4430 TRM: http://www.ti.com/lit/ug/swpu231ap/swpu231ap.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * under section 23.12.6.2.2 , Table 23-1213 OCP2SCP TIMING Caution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * As per OMAP4460 TRM: http://www.ti.com/lit/ug/swpu235ab/swpu235ab.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * under section 23.12.6.2.2, Table 23-1213 OCP2SCP TIMING Caution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * As per OMAP543x TRM http://www.ti.com/lit/pdf/swpu249
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * under section 27.3.2.2, Table 27-27 OCP2SCP TIMING Caution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * Read path of OCP2SCP is not working properly due to low reset value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * of SYNC2 parameter in OCP2SCP. Suggested reset value is 0x6 or more.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (!of_device_is_compatible(np, "ti,am437x-ocp2scp")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) regs = devm_ioremap_resource(&pdev->dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (IS_ERR(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) ret = PTR_ERR(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) goto err1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) pm_runtime_get_sync(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) reg = readl_relaxed(regs + OCP2SCP_TIMING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) reg &= ~(SYNC2_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) reg |= 0x6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) writel_relaxed(reg, regs + OCP2SCP_TIMING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) pm_runtime_put_sync(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) err1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) pm_runtime_disable(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) err0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static int omap_ocp2scp_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) pm_runtime_disable(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static const struct of_device_id omap_ocp2scp_id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) { .compatible = "ti,omap-ocp2scp" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) { .compatible = "ti,am437x-ocp2scp" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) MODULE_DEVICE_TABLE(of, omap_ocp2scp_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static struct platform_driver omap_ocp2scp_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .probe = omap_ocp2scp_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) .remove = omap_ocp2scp_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .name = "omap-ocp2scp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) .of_match_table = of_match_ptr(omap_ocp2scp_id_table),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) module_platform_driver(omap_ocp2scp_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) MODULE_ALIAS("platform:omap-ocp2scp");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) MODULE_AUTHOR("Texas Instruments Inc.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) MODULE_DESCRIPTION("OMAP OCP2SCP driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags