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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 16:39:53 +07:00
f70d9a2440
In case of error, the function of_platform_device_create() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Reviewed-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
333 lines
7.2 KiB
C
333 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Copyright (C) 2019 ASPEED Technology Inc. */
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/* Copyright (C) 2019 IBM Corp. */
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/mmc/host.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include "sdhci-pltfm.h"
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#define ASPEED_SDC_INFO 0x00
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#define ASPEED_SDC_S1MMC8 BIT(25)
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#define ASPEED_SDC_S0MMC8 BIT(24)
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struct aspeed_sdc {
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struct clk *clk;
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struct resource *res;
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spinlock_t lock;
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void __iomem *regs;
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};
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struct aspeed_sdhci {
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struct aspeed_sdc *parent;
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u32 width_mask;
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};
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static void aspeed_sdc_configure_8bit_mode(struct aspeed_sdc *sdc,
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struct aspeed_sdhci *sdhci,
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bool bus8)
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{
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u32 info;
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/* Set/clear 8 bit mode */
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spin_lock(&sdc->lock);
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info = readl(sdc->regs + ASPEED_SDC_INFO);
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if (bus8)
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info |= sdhci->width_mask;
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else
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info &= ~sdhci->width_mask;
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writel(info, sdc->regs + ASPEED_SDC_INFO);
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spin_unlock(&sdc->lock);
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}
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static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
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{
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int div;
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u16 clk;
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if (clock == host->clock)
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return;
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sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
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if (clock == 0)
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goto out;
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for (div = 1; div < 256; div *= 2) {
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if ((host->max_clk / div) <= clock)
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break;
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}
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div >>= 1;
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clk = div << SDHCI_DIVIDER_SHIFT;
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sdhci_enable_clk(host, clk);
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out:
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host->clock = clock;
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}
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static void aspeed_sdhci_set_bus_width(struct sdhci_host *host, int width)
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{
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struct sdhci_pltfm_host *pltfm_priv;
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struct aspeed_sdhci *aspeed_sdhci;
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struct aspeed_sdc *aspeed_sdc;
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u8 ctrl;
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pltfm_priv = sdhci_priv(host);
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aspeed_sdhci = sdhci_pltfm_priv(pltfm_priv);
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aspeed_sdc = aspeed_sdhci->parent;
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/* Set/clear 8-bit mode */
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aspeed_sdc_configure_8bit_mode(aspeed_sdc, aspeed_sdhci,
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width == MMC_BUS_WIDTH_8);
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/* Set/clear 1 or 4 bit mode */
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ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
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if (width == MMC_BUS_WIDTH_4)
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ctrl |= SDHCI_CTRL_4BITBUS;
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else
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ctrl &= ~SDHCI_CTRL_4BITBUS;
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sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
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}
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static const struct sdhci_ops aspeed_sdhci_ops = {
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.set_clock = aspeed_sdhci_set_clock,
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.get_max_clock = sdhci_pltfm_clk_get_max_clock,
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.set_bus_width = aspeed_sdhci_set_bus_width,
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.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
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.reset = sdhci_reset,
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.set_uhs_signaling = sdhci_set_uhs_signaling,
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};
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static const struct sdhci_pltfm_data aspeed_sdhci_pdata = {
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.ops = &aspeed_sdhci_ops,
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.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
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};
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static inline int aspeed_sdhci_calculate_slot(struct aspeed_sdhci *dev,
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struct resource *res)
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{
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resource_size_t delta;
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if (!res || resource_type(res) != IORESOURCE_MEM)
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return -EINVAL;
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if (res->start < dev->parent->res->start)
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return -EINVAL;
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delta = res->start - dev->parent->res->start;
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if (delta & (0x100 - 1))
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return -EINVAL;
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return (delta / 0x100) - 1;
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}
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static int aspeed_sdhci_probe(struct platform_device *pdev)
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{
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struct sdhci_pltfm_host *pltfm_host;
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struct aspeed_sdhci *dev;
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struct sdhci_host *host;
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struct resource *res;
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int slot;
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int ret;
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host = sdhci_pltfm_init(pdev, &aspeed_sdhci_pdata, sizeof(*dev));
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if (IS_ERR(host))
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return PTR_ERR(host);
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pltfm_host = sdhci_priv(host);
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dev = sdhci_pltfm_priv(pltfm_host);
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dev->parent = dev_get_drvdata(pdev->dev.parent);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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slot = aspeed_sdhci_calculate_slot(dev, res);
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if (slot < 0)
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return slot;
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else if (slot >= 2)
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return -EINVAL;
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dev_info(&pdev->dev, "Configuring for slot %d\n", slot);
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dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8;
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sdhci_get_of_property(pdev);
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pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(pltfm_host->clk))
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return PTR_ERR(pltfm_host->clk);
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ret = clk_prepare_enable(pltfm_host->clk);
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if (ret) {
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dev_err(&pdev->dev, "Unable to enable SDIO clock\n");
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goto err_pltfm_free;
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}
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ret = mmc_of_parse(host->mmc);
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if (ret)
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goto err_sdhci_add;
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ret = sdhci_add_host(host);
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if (ret)
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goto err_sdhci_add;
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return 0;
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err_sdhci_add:
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clk_disable_unprepare(pltfm_host->clk);
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err_pltfm_free:
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sdhci_pltfm_free(pdev);
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return ret;
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}
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static int aspeed_sdhci_remove(struct platform_device *pdev)
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{
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struct sdhci_pltfm_host *pltfm_host;
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struct sdhci_host *host;
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int dead = 0;
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host = platform_get_drvdata(pdev);
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pltfm_host = sdhci_priv(host);
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sdhci_remove_host(host, dead);
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clk_disable_unprepare(pltfm_host->clk);
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sdhci_pltfm_free(pdev);
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return 0;
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}
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static const struct of_device_id aspeed_sdhci_of_match[] = {
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{ .compatible = "aspeed,ast2400-sdhci", },
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{ .compatible = "aspeed,ast2500-sdhci", },
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{ .compatible = "aspeed,ast2600-sdhci", },
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{ }
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};
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static struct platform_driver aspeed_sdhci_driver = {
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.driver = {
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.name = "sdhci-aspeed",
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.of_match_table = aspeed_sdhci_of_match,
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},
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.probe = aspeed_sdhci_probe,
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.remove = aspeed_sdhci_remove,
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};
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static int aspeed_sdc_probe(struct platform_device *pdev)
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{
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struct device_node *parent, *child;
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struct aspeed_sdc *sdc;
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int ret;
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sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
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if (!sdc)
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return -ENOMEM;
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spin_lock_init(&sdc->lock);
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sdc->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(sdc->clk))
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return PTR_ERR(sdc->clk);
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ret = clk_prepare_enable(sdc->clk);
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if (ret) {
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dev_err(&pdev->dev, "Unable to enable SDCLK\n");
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return ret;
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}
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sdc->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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sdc->regs = devm_ioremap_resource(&pdev->dev, sdc->res);
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if (IS_ERR(sdc->regs)) {
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ret = PTR_ERR(sdc->regs);
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goto err_clk;
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}
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dev_set_drvdata(&pdev->dev, sdc);
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parent = pdev->dev.of_node;
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for_each_available_child_of_node(parent, child) {
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struct platform_device *cpdev;
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cpdev = of_platform_device_create(child, NULL, &pdev->dev);
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if (!cpdev) {
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of_node_put(child);
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ret = -ENODEV;
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goto err_clk;
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}
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}
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return 0;
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err_clk:
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clk_disable_unprepare(sdc->clk);
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return ret;
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}
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static int aspeed_sdc_remove(struct platform_device *pdev)
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{
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struct aspeed_sdc *sdc = dev_get_drvdata(&pdev->dev);
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clk_disable_unprepare(sdc->clk);
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return 0;
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}
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static const struct of_device_id aspeed_sdc_of_match[] = {
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{ .compatible = "aspeed,ast2400-sd-controller", },
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{ .compatible = "aspeed,ast2500-sd-controller", },
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{ .compatible = "aspeed,ast2600-sd-controller", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, aspeed_sdc_of_match);
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static struct platform_driver aspeed_sdc_driver = {
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.driver = {
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.name = "sd-controller-aspeed",
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.pm = &sdhci_pltfm_pmops,
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.of_match_table = aspeed_sdc_of_match,
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},
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.probe = aspeed_sdc_probe,
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.remove = aspeed_sdc_remove,
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};
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static int __init aspeed_sdc_init(void)
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{
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int rc;
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rc = platform_driver_register(&aspeed_sdhci_driver);
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if (rc < 0)
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return rc;
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rc = platform_driver_register(&aspeed_sdc_driver);
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if (rc < 0)
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platform_driver_unregister(&aspeed_sdhci_driver);
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return rc;
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}
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module_init(aspeed_sdc_init);
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static void __exit aspeed_sdc_exit(void)
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{
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platform_driver_unregister(&aspeed_sdc_driver);
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platform_driver_unregister(&aspeed_sdhci_driver);
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}
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module_exit(aspeed_sdc_exit);
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MODULE_DESCRIPTION("Driver for the ASPEED SD/SDIO/SDHCI Controllers");
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MODULE_AUTHOR("Ryan Chen <ryan_chen@aspeedtech.com>");
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MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
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MODULE_LICENSE("GPL");
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