Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 228 insertions, 0 deletions

diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
new file mode 100644
index 000000000..d2d3b8df1
--- /dev/null
+++ b/drivers/mmc/host/tmio_mmc.c
@@ -0,0 +1,228 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the MMC / SD / SDIO cell found in:
+ *
+ * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
+ *
+ * Copyright (C) 2017 Renesas Electronics Corporation
+ * Copyright (C) 2017 Horms Solutions, Simon Horman
+ * Copyright (C) 2007 Ian Molton
+ * Copyright (C) 2004 Ian Molton
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tmio.h>
+#include <linux/mmc/host.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/scatterlist.h>
+
+#include "tmio_mmc.h"
+
+/* Registers specific to this variant */
+#define CTL_SDIO_REGS		0x100
+#define CTL_CLK_AND_WAIT_CTL	0x138
+#define CTL_RESET_SDIO		0x1e0
+
+static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
+{
+	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
+		sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+
+	usleep_range(10000, 11000);
+	sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
+	usleep_range(10000, 11000);
+}
+
+static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
+{
+	sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
+	usleep_range(10000, 11000);
+
+	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
+		sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+
+	usleep_range(10000, 11000);
+}
+
+static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
+			       unsigned int new_clock)
+{
+	unsigned int divisor;
+	u32 clk = 0;
+	int clk_sel;
+
+	if (new_clock == 0) {
+		tmio_mmc_clk_stop(host);
+		return;
+	}
+
+	divisor = host->pdata->hclk / new_clock;
+
+	/* bit7 set: 1/512, ... bit0 set: 1/4, all bits clear: 1/2 */
+	clk_sel = (divisor <= 1);
+	clk = clk_sel ? 0 : (roundup_pow_of_two(divisor) >> 2);
+
+	host->pdata->set_clk_div(host->pdev, clk_sel);
+
+	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
+			sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
+	usleep_range(10000, 11000);
+
+	tmio_mmc_clk_start(host);
+}
+
+static void tmio_mmc_reset(struct tmio_mmc_host *host)
+{
+	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
+	usleep_range(10000, 11000);
+	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
+	usleep_range(10000, 11000);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tmio_mmc_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	int ret;
+
+	ret = pm_runtime_force_suspend(dev);
+
+	/* Tell MFD core it can disable us now.*/
+	if (!ret && cell->disable)
+		cell->disable(pdev);
+
+	return ret;
+}
+
+static int tmio_mmc_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	int ret = 0;
+
+	/* Tell the MFD core we are ready to be enabled */
+	if (cell->resume)
+		ret = cell->resume(pdev);
+
+	if (!ret)
+		ret = pm_runtime_force_resume(dev);
+
+	return ret;
+}
+#endif
+
+static int tmio_mmc_probe(struct platform_device *pdev)
+{
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	struct tmio_mmc_data *pdata;
+	struct tmio_mmc_host *host;
+	struct resource *res;
+	int ret = -EINVAL, irq;
+
+	if (pdev->num_resources != 2)
+		goto out;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata || !pdata->hclk)
+		goto out;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		ret = irq;
+		goto out;
+	}
+
+	/* Tell the MFD core we are ready to be enabled */
+	if (cell->enable) {
+		ret = cell->enable(pdev);
+		if (ret)
+			goto out;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		ret = -EINVAL;
+		goto cell_disable;
+	}
+
+	host = tmio_mmc_host_alloc(pdev, pdata);
+	if (IS_ERR(host)) {
+		ret = PTR_ERR(host);
+		goto cell_disable;
+	}
+
+	/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
+	host->bus_shift = resource_size(res) >> 10;
+	host->set_clock = tmio_mmc_set_clock;
+	host->reset = tmio_mmc_reset;
+
+	host->mmc->f_max = pdata->hclk;
+	host->mmc->f_min = pdata->hclk / 512;
+
+	ret = tmio_mmc_host_probe(host);
+	if (ret)
+		goto host_free;
+
+	ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
+			       IRQF_TRIGGER_FALLING,
+			       dev_name(&pdev->dev), host);
+	if (ret)
+		goto host_remove;
+
+	pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
+		(unsigned long)host->ctl, irq);
+
+	return 0;
+
+host_remove:
+	tmio_mmc_host_remove(host);
+host_free:
+	tmio_mmc_host_free(host);
+cell_disable:
+	if (cell->disable)
+		cell->disable(pdev);
+out:
+	return ret;
+}
+
+static int tmio_mmc_remove(struct platform_device *pdev)
+{
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	struct tmio_mmc_host *host = platform_get_drvdata(pdev);
+
+	tmio_mmc_host_remove(host);
+	if (cell->disable)
+		cell->disable(pdev);
+
+	return 0;
+}
+
+/* ------------------- device registration ----------------------- */
+
+static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
+	SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
+			   tmio_mmc_host_runtime_resume, NULL)
+};
+
+static struct platform_driver tmio_mmc_driver = {
+	.driver = {
+		.name = "tmio-mmc",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.pm = &tmio_mmc_dev_pm_ops,
+	},
+	.probe = tmio_mmc_probe,
+	.remove = tmio_mmc_remove,
+};
+
+module_platform_driver(tmio_mmc_driver);
+
+MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
+MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:tmio-mmc");