^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * drivers/mmc/host/sdhci-spear.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Support of SDHCI platform devices for spear soc family
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2010 ST Microelectronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Viresh Kumar <vireshk@kernel.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Inspired by sdhci-pltfm.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * This file is licensed under the terms of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * License version 2. This program is licensed "as is" without any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * warranty of any kind, whether express or implied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/mmc/host.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/mmc/slot-gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include "sdhci.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct spear_sdhci {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* sdhci ops */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static const struct sdhci_ops sdhci_pltfm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) .set_clock = sdhci_set_clock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) .set_bus_width = sdhci_set_bus_width,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) .reset = sdhci_reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) .set_uhs_signaling = sdhci_set_uhs_signaling,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int sdhci_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct sdhci_host *host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct spear_sdhci *sdhci;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) host = sdhci_alloc_host(dev, sizeof(*sdhci));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (IS_ERR(host)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) ret = PTR_ERR(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) host->ioaddr = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (IS_ERR(host->ioaddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ret = PTR_ERR(host->ioaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) goto err_host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) host->hw_name = "sdhci";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) host->ops = &sdhci_pltfm_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) host->irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (host->irq <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) goto err_host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) sdhci = sdhci_priv(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* clk enable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) sdhci->clk = devm_clk_get(&pdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (IS_ERR(sdhci->clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) ret = PTR_ERR(sdhci->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) dev_dbg(&pdev->dev, "Error getting clock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) goto err_host;
^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) ret = clk_prepare_enable(sdhci->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) dev_dbg(&pdev->dev, "Error enabling clock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) goto err_host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ret = clk_set_rate(sdhci->clk, 50000000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) clk_get_rate(sdhci->clk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * It is optional to use GPIOs for sdhci card detection. If we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * find a descriptor using slot GPIO, we use it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (ret == -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) goto disable_clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ret = sdhci_add_host(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) goto disable_clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) platform_set_drvdata(pdev, host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) disable_clk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) clk_disable_unprepare(sdhci->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) err_host:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) sdhci_free_host(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return ret;
^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) static int sdhci_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct sdhci_host *host = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct spear_sdhci *sdhci = sdhci_priv(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) int dead = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) u32 scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (scratch == (u32)-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) dead = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) sdhci_remove_host(host, dead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) clk_disable_unprepare(sdhci->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) sdhci_free_host(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static int sdhci_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct sdhci_host *host = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct spear_sdhci *sdhci = sdhci_priv(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (host->tuning_mode != SDHCI_TUNING_MODE_3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) mmc_retune_needed(host->mmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) ret = sdhci_suspend_host(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) clk_disable(sdhci->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static int sdhci_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct sdhci_host *host = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) struct spear_sdhci *sdhci = sdhci_priv(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ret = clk_enable(sdhci->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) dev_dbg(dev, "Resume: Error enabling clock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return sdhci_resume_host(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static const struct of_device_id sdhci_spear_id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) { .compatible = "st,spear300-sdhci" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static struct platform_driver sdhci_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) .name = "sdhci",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) .probe_type = PROBE_PREFER_ASYNCHRONOUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) .pm = &sdhci_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) .of_match_table = of_match_ptr(sdhci_spear_id_table),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) .probe = sdhci_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) .remove = sdhci_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) module_platform_driver(sdhci_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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