summaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/sdhci-of-aspeed.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mmc/host/sdhci-of-aspeed.c')
-rw-r--r--drivers/mmc/host/sdhci-of-aspeed.c631
1 files changed, 631 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
new file mode 100644
index 0000000000..42d54532ca
--- /dev/null
+++ b/drivers/mmc/host/sdhci-of-aspeed.c
@@ -0,0 +1,631 @@
+// 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/math64.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_S1_MMC8 BIT(25)
+#define ASPEED_SDC_S0_MMC8 BIT(24)
+#define ASPEED_SDC_PHASE 0xf4
+#define ASPEED_SDC_S1_PHASE_IN GENMASK(25, 21)
+#define ASPEED_SDC_S0_PHASE_IN GENMASK(20, 16)
+#define ASPEED_SDC_S1_PHASE_OUT GENMASK(15, 11)
+#define ASPEED_SDC_S1_PHASE_IN_EN BIT(10)
+#define ASPEED_SDC_S1_PHASE_OUT_EN GENMASK(9, 8)
+#define ASPEED_SDC_S0_PHASE_OUT GENMASK(7, 3)
+#define ASPEED_SDC_S0_PHASE_IN_EN BIT(2)
+#define ASPEED_SDC_S0_PHASE_OUT_EN GENMASK(1, 0)
+#define ASPEED_SDC_PHASE_MAX 31
+
+/* SDIO{10,20} */
+#define ASPEED_SDC_CAP1_1_8V (0 * 32 + 26)
+/* SDIO{14,24} */
+#define ASPEED_SDC_CAP2_SDR104 (1 * 32 + 1)
+
+struct aspeed_sdc {
+ struct clk *clk;
+ struct resource *res;
+
+ spinlock_t lock;
+ void __iomem *regs;
+};
+
+struct aspeed_sdhci_tap_param {
+ bool valid;
+
+#define ASPEED_SDHCI_TAP_PARAM_INVERT_CLK BIT(4)
+ u8 in;
+ u8 out;
+};
+
+struct aspeed_sdhci_tap_desc {
+ u32 tap_mask;
+ u32 enable_mask;
+ u8 enable_value;
+};
+
+struct aspeed_sdhci_phase_desc {
+ struct aspeed_sdhci_tap_desc in;
+ struct aspeed_sdhci_tap_desc out;
+};
+
+struct aspeed_sdhci_pdata {
+ unsigned int clk_div_start;
+ const struct aspeed_sdhci_phase_desc *phase_desc;
+ size_t nr_phase_descs;
+};
+
+struct aspeed_sdhci {
+ const struct aspeed_sdhci_pdata *pdata;
+ struct aspeed_sdc *parent;
+ u32 width_mask;
+ struct mmc_clk_phase_map phase_map;
+ const struct aspeed_sdhci_phase_desc *phase_desc;
+};
+
+/*
+ * The function sets the mirror register for updating
+ * capbilities of the current slot.
+ *
+ * slot | capability | caps_reg | mirror_reg
+ * -----|-------------|----------|------------
+ * 0 | CAP1_1_8V | SDIO140 | SDIO10
+ * 0 | CAP2_SDR104 | SDIO144 | SDIO14
+ * 1 | CAP1_1_8V | SDIO240 | SDIO20
+ * 1 | CAP2_SDR104 | SDIO244 | SDIO24
+ */
+static void aspeed_sdc_set_slot_capability(struct sdhci_host *host, struct aspeed_sdc *sdc,
+ int capability, bool enable, u8 slot)
+{
+ u32 mirror_reg_offset;
+ u32 cap_val;
+ u8 cap_reg;
+
+ if (slot > 1)
+ return;
+
+ cap_reg = capability / 32;
+ cap_val = sdhci_readl(host, 0x40 + (cap_reg * 4));
+ if (enable)
+ cap_val |= BIT(capability % 32);
+ else
+ cap_val &= ~BIT(capability % 32);
+ mirror_reg_offset = ((slot + 1) * 0x10) + (cap_reg * 4);
+ writel(cap_val, sdc->regs + mirror_reg_offset);
+}
+
+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 u32
+aspeed_sdc_set_phase_tap(const struct aspeed_sdhci_tap_desc *desc,
+ u8 tap, bool enable, u32 reg)
+{
+ reg &= ~(desc->enable_mask | desc->tap_mask);
+ if (enable) {
+ reg |= tap << __ffs(desc->tap_mask);
+ reg |= desc->enable_value << __ffs(desc->enable_mask);
+ }
+
+ return reg;
+}
+
+static void
+aspeed_sdc_set_phase_taps(struct aspeed_sdc *sdc,
+ const struct aspeed_sdhci_phase_desc *desc,
+ const struct aspeed_sdhci_tap_param *taps)
+{
+ u32 reg;
+
+ spin_lock(&sdc->lock);
+ reg = readl(sdc->regs + ASPEED_SDC_PHASE);
+
+ reg = aspeed_sdc_set_phase_tap(&desc->in, taps->in, taps->valid, reg);
+ reg = aspeed_sdc_set_phase_tap(&desc->out, taps->out, taps->valid, reg);
+
+ writel(reg, sdc->regs + ASPEED_SDC_PHASE);
+ spin_unlock(&sdc->lock);
+}
+
+#define PICOSECONDS_PER_SECOND 1000000000000ULL
+#define ASPEED_SDHCI_NR_TAPS 15
+/* Measured value with *handwave* environmentals and static loading */
+#define ASPEED_SDHCI_MAX_TAP_DELAY_PS 1253
+static int aspeed_sdhci_phase_to_tap(struct device *dev, unsigned long rate_hz,
+ int phase_deg)
+{
+ u64 phase_period_ps;
+ u64 prop_delay_ps;
+ u64 clk_period_ps;
+ unsigned int tap;
+ u8 inverted;
+
+ phase_deg %= 360;
+
+ if (phase_deg >= 180) {
+ inverted = ASPEED_SDHCI_TAP_PARAM_INVERT_CLK;
+ phase_deg -= 180;
+ dev_dbg(dev,
+ "Inverting clock to reduce phase correction from %d to %d degrees\n",
+ phase_deg + 180, phase_deg);
+ } else {
+ inverted = 0;
+ }
+
+ prop_delay_ps = ASPEED_SDHCI_MAX_TAP_DELAY_PS / ASPEED_SDHCI_NR_TAPS;
+ clk_period_ps = div_u64(PICOSECONDS_PER_SECOND, (u64)rate_hz);
+ phase_period_ps = div_u64((u64)phase_deg * clk_period_ps, 360ULL);
+
+ tap = div_u64(phase_period_ps, prop_delay_ps);
+ if (tap > ASPEED_SDHCI_NR_TAPS) {
+ dev_dbg(dev,
+ "Requested out of range phase tap %d for %d degrees of phase compensation at %luHz, clamping to tap %d\n",
+ tap, phase_deg, rate_hz, ASPEED_SDHCI_NR_TAPS);
+ tap = ASPEED_SDHCI_NR_TAPS;
+ }
+
+ return inverted | tap;
+}
+
+static void
+aspeed_sdhci_phases_to_taps(struct device *dev, unsigned long rate,
+ const struct mmc_clk_phase *phases,
+ struct aspeed_sdhci_tap_param *taps)
+{
+ taps->valid = phases->valid;
+
+ if (!phases->valid)
+ return;
+
+ taps->in = aspeed_sdhci_phase_to_tap(dev, rate, phases->in_deg);
+ taps->out = aspeed_sdhci_phase_to_tap(dev, rate, phases->out_deg);
+}
+
+static void
+aspeed_sdhci_configure_phase(struct sdhci_host *host, unsigned long rate)
+{
+ struct aspeed_sdhci_tap_param _taps = {0}, *taps = &_taps;
+ struct mmc_clk_phase *params;
+ struct aspeed_sdhci *sdhci;
+ struct device *dev;
+
+ dev = mmc_dev(host->mmc);
+ sdhci = sdhci_pltfm_priv(sdhci_priv(host));
+
+ if (!sdhci->phase_desc)
+ return;
+
+ params = &sdhci->phase_map.phase[host->timing];
+ aspeed_sdhci_phases_to_taps(dev, rate, params, taps);
+ aspeed_sdc_set_phase_taps(sdhci->parent, sdhci->phase_desc, taps);
+ dev_dbg(dev,
+ "Using taps [%d, %d] for [%d, %d] degrees of phase correction at %luHz (%d)\n",
+ taps->in & ASPEED_SDHCI_NR_TAPS,
+ taps->out & ASPEED_SDHCI_NR_TAPS,
+ params->in_deg, params->out_deg, rate, host->timing);
+}
+
+static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+ struct sdhci_pltfm_host *pltfm_host;
+ unsigned long parent, bus;
+ struct aspeed_sdhci *sdhci;
+ int div;
+ u16 clk;
+
+ pltfm_host = sdhci_priv(host);
+ sdhci = sdhci_pltfm_priv(pltfm_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;
+
+ /*
+ * Regarding the AST2600:
+ *
+ * If (EMMC12C[7:6], EMMC12C[15:8] == 0) then
+ * period of SDCLK = period of SDMCLK.
+ *
+ * If (EMMC12C[7:6], EMMC12C[15:8] != 0) then
+ * period of SDCLK = period of SDMCLK * 2 * (EMMC12C[7:6], EMMC[15:8])
+ *
+ * If you keep EMMC12C[7:6] = 0 and EMMC12C[15:8] as one-hot,
+ * 0x1/0x2/0x4/etc, you will find it is compatible to AST2400 or AST2500
+ *
+ * Keep the one-hot behaviour for backwards compatibility except for
+ * supporting the value 0 in (EMMC12C[7:6], EMMC12C[15:8]), and capture
+ * the 0-value capability in clk_div_start.
+ */
+ for (div = sdhci->pdata->clk_div_start; div < 256; div *= 2) {
+ bus = parent / div;
+ if (bus <= clock)
+ break;
+ }
+
+ div >>= 1;
+
+ clk = div << SDHCI_DIVIDER_SHIFT;
+
+ aspeed_sdhci_configure_phase(host, bus);
+
+ 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 u32 aspeed_sdhci_readl(struct sdhci_host *host, int reg)
+{
+ u32 val = readl(host->ioaddr + reg);
+
+ if (unlikely(reg == SDHCI_PRESENT_STATE) &&
+ (host->mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH))
+ val ^= SDHCI_CARD_PRESENT;
+
+ return val;
+}
+
+static const struct sdhci_ops aspeed_sdhci_ops = {
+ .read_l = aspeed_sdhci_readl,
+ .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)
+{
+ const struct aspeed_sdhci_pdata *aspeed_pdata;
+ struct device_node *np = pdev->dev.of_node;
+ struct sdhci_pltfm_host *pltfm_host;
+ struct aspeed_sdhci *dev;
+ struct sdhci_host *host;
+ struct resource *res;
+ int slot;
+ int ret;
+
+ aspeed_pdata = of_device_get_match_data(&pdev->dev);
+ if (!aspeed_pdata) {
+ dev_err(&pdev->dev, "Missing platform configuration data\n");
+ return -EINVAL;
+ }
+
+ 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->pdata = aspeed_pdata;
+ 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;
+
+ if (slot < dev->pdata->nr_phase_descs) {
+ dev->phase_desc = &dev->pdata->phase_desc[slot];
+ } else {
+ dev_info(&pdev->dev,
+ "Phase control not supported for slot %d\n", slot);
+ dev->phase_desc = NULL;
+ }
+
+ dev->width_mask = !slot ? ASPEED_SDC_S0_MMC8 : ASPEED_SDC_S1_MMC8;
+
+ dev_info(&pdev->dev, "Configured for slot %d\n", slot);
+
+ sdhci_get_of_property(pdev);
+
+ if (of_property_read_bool(np, "mmc-hs200-1_8v") ||
+ of_property_read_bool(np, "sd-uhs-sdr104")) {
+ aspeed_sdc_set_slot_capability(host, dev->parent, ASPEED_SDC_CAP1_1_8V,
+ true, slot);
+ }
+
+ if (of_property_read_bool(np, "sd-uhs-sdr104")) {
+ aspeed_sdc_set_slot_capability(host, dev->parent, ASPEED_SDC_CAP2_SDR104,
+ true, slot);
+ }
+
+ 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;
+
+ if (dev->phase_desc)
+ mmc_of_parse_clk_phase(host->mmc, &dev->phase_map);
+
+ 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 void aspeed_sdhci_remove(struct platform_device *pdev)
+{
+ struct sdhci_pltfm_host *pltfm_host;
+ struct sdhci_host *host;
+
+ host = platform_get_drvdata(pdev);
+ pltfm_host = sdhci_priv(host);
+
+ sdhci_remove_host(host, 0);
+
+ clk_disable_unprepare(pltfm_host->clk);
+
+ sdhci_pltfm_free(pdev);
+}
+
+static const struct aspeed_sdhci_pdata ast2400_sdhci_pdata = {
+ .clk_div_start = 2,
+};
+
+static const struct aspeed_sdhci_phase_desc ast2600_sdhci_phase[] = {
+ /* SDHCI/Slot 0 */
+ [0] = {
+ .in = {
+ .tap_mask = ASPEED_SDC_S0_PHASE_IN,
+ .enable_mask = ASPEED_SDC_S0_PHASE_IN_EN,
+ .enable_value = 1,
+ },
+ .out = {
+ .tap_mask = ASPEED_SDC_S0_PHASE_OUT,
+ .enable_mask = ASPEED_SDC_S0_PHASE_OUT_EN,
+ .enable_value = 3,
+ },
+ },
+ /* SDHCI/Slot 1 */
+ [1] = {
+ .in = {
+ .tap_mask = ASPEED_SDC_S1_PHASE_IN,
+ .enable_mask = ASPEED_SDC_S1_PHASE_IN_EN,
+ .enable_value = 1,
+ },
+ .out = {
+ .tap_mask = ASPEED_SDC_S1_PHASE_OUT,
+ .enable_mask = ASPEED_SDC_S1_PHASE_OUT_EN,
+ .enable_value = 3,
+ },
+ },
+};
+
+static const struct aspeed_sdhci_pdata ast2600_sdhci_pdata = {
+ .clk_div_start = 1,
+ .phase_desc = ast2600_sdhci_phase,
+ .nr_phase_descs = ARRAY_SIZE(ast2600_sdhci_phase),
+};
+
+static const struct of_device_id aspeed_sdhci_of_match[] = {
+ { .compatible = "aspeed,ast2400-sdhci", .data = &ast2400_sdhci_pdata, },
+ { .compatible = "aspeed,ast2500-sdhci", .data = &ast2400_sdhci_pdata, },
+ { .compatible = "aspeed,ast2600-sdhci", .data = &ast2600_sdhci_pdata, },
+ { }
+};
+
+static struct platform_driver aspeed_sdhci_driver = {
+ .driver = {
+ .name = "sdhci-aspeed",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .of_match_table = aspeed_sdhci_of_match,
+ },
+ .probe = aspeed_sdhci_probe,
+ .remove_new = 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->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &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 void aspeed_sdc_remove(struct platform_device *pdev)
+{
+ struct aspeed_sdc *sdc = dev_get_drvdata(&pdev->dev);
+
+ clk_disable_unprepare(sdc->clk);
+}
+
+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",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .pm = &sdhci_pltfm_pmops,
+ .of_match_table = aspeed_sdc_of_match,
+ },
+ .probe = aspeed_sdc_probe,
+ .remove_new = aspeed_sdc_remove,
+};
+
+#if defined(CONFIG_MMC_SDHCI_OF_ASPEED_TEST)
+#include "sdhci-of-aspeed-test.c"
+#endif
+
+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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 20:09:09 +0000