^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Driver for Atmel Flexcom
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2015 Atmel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^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/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.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) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <dt-bindings/mfd/atmel-flexcom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /* I/O register offsets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define FLEX_MR 0x0 /* Mode Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define FLEX_VERSION 0xfc /* Version Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* Mode Register bit fields */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define FLEX_MR_OPMODE_OFFSET (0) /* Operating Mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define FLEX_MR_OPMODE_MASK (0x3 << FLEX_MR_OPMODE_OFFSET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define FLEX_MR_OPMODE(opmode) (((opmode) << FLEX_MR_OPMODE_OFFSET) & \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) FLEX_MR_OPMODE_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct atmel_flexcom {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) u32 opmode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int atmel_flexcom_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct atmel_flexcom *ddata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (!ddata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) platform_set_drvdata(pdev, ddata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) err = of_property_read_u32(np, "atmel,flexcom-mode", &ddata->opmode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (ddata->opmode < ATMEL_FLEXCOM_MODE_USART ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ddata->opmode > ATMEL_FLEXCOM_MODE_TWI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ddata->base = devm_ioremap_resource(&pdev->dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (IS_ERR(ddata->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return PTR_ERR(ddata->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ddata->clk = devm_clk_get(&pdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (IS_ERR(ddata->clk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return PTR_ERR(ddata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) err = clk_prepare_enable(ddata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * Set the Operating Mode in the Mode Register: only the selected device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * is clocked. Hence, registers of the other serial devices remain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * inaccessible and are read as zero. Also the external I/O lines of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Flexcom are muxed to reach the selected device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) writel(FLEX_MR_OPMODE(ddata->opmode), ddata->base + FLEX_MR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) clk_disable_unprepare(ddata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return devm_of_platform_populate(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static const struct of_device_id atmel_flexcom_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) { .compatible = "atmel,sama5d2-flexcom" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) { /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static int __maybe_unused atmel_flexcom_resume_noirq(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct atmel_flexcom *ddata = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) err = clk_prepare_enable(ddata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) val = FLEX_MR_OPMODE(ddata->opmode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) writel(val, ddata->base + FLEX_MR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) clk_disable_unprepare(ddata->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static const struct dev_pm_ops atmel_flexcom_pm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) .resume_noirq = atmel_flexcom_resume_noirq,
^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) static struct platform_driver atmel_flexcom_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) .probe = atmel_flexcom_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) .name = "atmel_flexcom",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) .pm = pm_ptr(&atmel_flexcom_pm_ops),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .of_match_table = atmel_flexcom_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) module_platform_driver(atmel_flexcom_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) MODULE_DESCRIPTION("Atmel Flexcom MFD driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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