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// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright (C) 2019 ASPEED Technology Inc. */
/* Copyright (C) 2019 IBM Corp. */
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include "sdhci-pltfm.h"
#define ASPEED_SDC_INFO 0x00
#define ASPEED_SDC_S1MMC8 BIT(25)
#define ASPEED_SDC_S0MMC8 BIT(24)
struct aspeed_sdc {
struct clk *clk;
struct resource *res;
spinlock_t lock;
void __iomem *regs;
};
struct aspeed_sdhci {
struct aspeed_sdc *parent;
u32 width_mask;
};
static void aspeed_sdc_configure_8bit_mode(struct aspeed_sdc *sdc,
struct aspeed_sdhci *sdhci,
bool bus8)
{
u32 info;
/* Set/clear 8 bit mode */
spin_lock(&sdc->lock);
info = readl(sdc->regs + ASPEED_SDC_INFO);
if (bus8)
info |= sdhci->width_mask;
else
info &= ~sdhci->width_mask;
writel(info, sdc->regs + ASPEED_SDC_INFO);
spin_unlock(&sdc->lock);
}
static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host;
unsigned long parent;
int div;
u16 clk;
pltfm_host = sdhci_priv(host);
parent = clk_get_rate(pltfm_host->clk);
sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
if (clock == 0)
return;
if (WARN_ON(clock > host->max_clk))
clock = host->max_clk;
for (div = 1; div < 256; div *= 2) {
if ((parent / div) <= clock)
break;
}
div >>= 1;
clk = div << SDHCI_DIVIDER_SHIFT;
sdhci_enable_clk(host, clk);
}
static unsigned int aspeed_sdhci_get_max_clock(struct sdhci_host *host)
{
if (host->mmc->f_max)
return host->mmc->f_max;
return sdhci_pltfm_clk_get_max_clock(host);
}
static void aspeed_sdhci_set_bus_width(struct sdhci_host *host, int width)
{
struct sdhci_pltfm_host *pltfm_priv;
struct aspeed_sdhci *aspeed_sdhci;
struct aspeed_sdc *aspeed_sdc;
u8 ctrl;
pltfm_priv = sdhci_priv(host);
aspeed_sdhci = sdhci_pltfm_priv(pltfm_priv);
aspeed_sdc = aspeed_sdhci->parent;
/* Set/clear 8-bit mode */
aspeed_sdc_configure_8bit_mode(aspeed_sdc, aspeed_sdhci,
width == MMC_BUS_WIDTH_8);
/* Set/clear 1 or 4 bit mode */
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
if (width == MMC_BUS_WIDTH_4)
ctrl |= SDHCI_CTRL_4BITBUS;
else
ctrl &= ~SDHCI_CTRL_4BITBUS;
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
}
static const struct sdhci_ops aspeed_sdhci_ops = {
.set_clock = aspeed_sdhci_set_clock,
.get_max_clock = aspeed_sdhci_get_max_clock,
.set_bus_width = aspeed_sdhci_set_bus_width,
.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
static const struct sdhci_pltfm_data aspeed_sdhci_pdata = {
.ops = &aspeed_sdhci_ops,
.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
};
static inline int aspeed_sdhci_calculate_slot(struct aspeed_sdhci *dev,
struct resource *res)
{
resource_size_t delta;
if (!res || resource_type(res) != IORESOURCE_MEM)
return -EINVAL;
if (res->start < dev->parent->res->start)
return -EINVAL;
delta = res->start - dev->parent->res->start;
if (delta & (0x100 - 1))
return -EINVAL;
return (delta / 0x100) - 1;
}
static int aspeed_sdhci_probe(struct platform_device *pdev)
{
struct sdhci_pltfm_host *pltfm_host;
struct aspeed_sdhci *dev;
struct sdhci_host *host;
struct resource *res;
int slot;
int ret;
host = sdhci_pltfm_init(pdev, &aspeed_sdhci_pdata, sizeof(*dev));
if (IS_ERR(host))
return PTR_ERR(host);
pltfm_host = sdhci_priv(host);
dev = sdhci_pltfm_priv(pltfm_host);
dev->parent = dev_get_drvdata(pdev->dev.parent);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
slot = aspeed_sdhci_calculate_slot(dev, res);
if (slot < 0)
return slot;
else if (slot >= 2)
return -EINVAL;
dev_info(&pdev->dev, "Configuring for slot %d\n", slot);
dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8;
sdhci_get_of_property(pdev);
pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pltfm_host->clk))
return PTR_ERR(pltfm_host->clk);
ret = clk_prepare_enable(pltfm_host->clk);
if (ret) {
dev_err(&pdev->dev, "Unable to enable SDIO clock\n");
goto err_pltfm_free;
}
ret = mmc_of_parse(host->mmc);
if (ret)
goto err_sdhci_add;
ret = sdhci_add_host(host);
if (ret)
goto err_sdhci_add;
return 0;
err_sdhci_add:
clk_disable_unprepare(pltfm_host->clk);
err_pltfm_free:
sdhci_pltfm_free(pdev);
return ret;
}
static int aspeed_sdhci_remove(struct platform_device *pdev)
{
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_host *host;
int dead = 0;
host = platform_get_drvdata(pdev);
pltfm_host = sdhci_priv(host);
sdhci_remove_host(host, dead);
clk_disable_unprepare(pltfm_host->clk);
sdhci_pltfm_free(pdev);
return 0;
}
static const struct of_device_id aspeed_sdhci_of_match[] = {
{ .compatible = "aspeed,ast2400-sdhci", },
{ .compatible = "aspeed,ast2500-sdhci", },
{ .compatible = "aspeed,ast2600-sdhci", },
{ }
};
static struct platform_driver aspeed_sdhci_driver = {
.driver = {
.name = "sdhci-aspeed",
.of_match_table = aspeed_sdhci_of_match,
},
.probe = aspeed_sdhci_probe,
.remove = aspeed_sdhci_remove,
};
static int aspeed_sdc_probe(struct platform_device *pdev)
{
struct device_node *parent, *child;
struct aspeed_sdc *sdc;
int ret;
sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
if (!sdc)
return -ENOMEM;
spin_lock_init(&sdc->lock);
sdc->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(sdc->clk))
return PTR_ERR(sdc->clk);
ret = clk_prepare_enable(sdc->clk);
if (ret) {
dev_err(&pdev->dev, "Unable to enable SDCLK\n");
return ret;
}
sdc->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sdc->regs = devm_ioremap_resource(&pdev->dev, sdc->res);
if (IS_ERR(sdc->regs)) {
ret = PTR_ERR(sdc->regs);
goto err_clk;
}
dev_set_drvdata(&pdev->dev, sdc);
parent = pdev->dev.of_node;
for_each_available_child_of_node(parent, child) {
struct platform_device *cpdev;
cpdev = of_platform_device_create(child, NULL, &pdev->dev);
if (!cpdev) {
of_node_put(child);
ret = -ENODEV;
goto err_clk;
}
}
return 0;
err_clk:
clk_disable_unprepare(sdc->clk);
return ret;
}
static int aspeed_sdc_remove(struct platform_device *pdev)
{
struct aspeed_sdc *sdc = dev_get_drvdata(&pdev->dev);
clk_disable_unprepare(sdc->clk);
return 0;
}
static const struct of_device_id aspeed_sdc_of_match[] = {
{ .compatible = "aspeed,ast2400-sd-controller", },
{ .compatible = "aspeed,ast2500-sd-controller", },
{ .compatible = "aspeed,ast2600-sd-controller", },
{ }
};
MODULE_DEVICE_TABLE(of, aspeed_sdc_of_match);
static struct platform_driver aspeed_sdc_driver = {
.driver = {
.name = "sd-controller-aspeed",
.pm = &sdhci_pltfm_pmops,
.of_match_table = aspeed_sdc_of_match,
},
.probe = aspeed_sdc_probe,
.remove = aspeed_sdc_remove,
};
static int __init aspeed_sdc_init(void)
{
int rc;
rc = platform_driver_register(&aspeed_sdhci_driver);
if (rc < 0)
return rc;
rc = platform_driver_register(&aspeed_sdc_driver);
if (rc < 0)
platform_driver_unregister(&aspeed_sdhci_driver);
return rc;
}
module_init(aspeed_sdc_init);
static void __exit aspeed_sdc_exit(void)
{
platform_driver_unregister(&aspeed_sdc_driver);
platform_driver_unregister(&aspeed_sdhci_driver);
}
module_exit(aspeed_sdc_exit);
MODULE_DESCRIPTION("Driver for the ASPEED SD/SDIO/SDHCI Controllers");
MODULE_AUTHOR("Ryan Chen <ryan_chen@aspeedtech.com>");
MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
MODULE_LICENSE("GPL");
|