[U-Boot] [PATCH 10/13] mmc: am654_sdhci: Add Support for PHY
Faiz Abbas
faiz_abbas at ti.com
Mon Jan 28 06:45:28 UTC 2019
Add support in the driver for handling phy specific registers.
Signed-off-by: Faiz Abbas <faiz4000 at gmail.com>
---
drivers/mmc/Kconfig | 1 +
drivers/mmc/am654_sdhci.c | 224 +++++++++++++++++++++++++++++++++++++-
2 files changed, 222 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 12b9356f0c..45eb1cd09a 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -420,6 +420,7 @@ config MMC_SDHCI_AM654
depends on ARCH_K3
depends on MMC_SDHCI
depends on DM_MMC && OF_CONTROL && BLK
+ depends on REGMAP
help
Support for Secure Digital Host Controller Interface (SDHCI)
controllers present on TI's AM654 SOCs.
diff --git a/drivers/mmc/am654_sdhci.c b/drivers/mmc/am654_sdhci.c
index 69914deb0c..123f4c3e8b 100644
--- a/drivers/mmc/am654_sdhci.c
+++ b/drivers/mmc/am654_sdhci.c
@@ -10,16 +10,190 @@
#include <dm.h>
#include <malloc.h>
#include <power-domain.h>
+#include <regmap.h>
#include <sdhci.h>
+/* CTL_CFG Registers */
+#define CTL_CFG_2 0x14
+
+#define SLOTTYPE_MASK GENMASK(31, 30)
+#define SLOTTYPE_EMBEDDED BIT(30)
+
+/* PHY Registers */
+#define PHY_CTRL1 0x100
+#define PHY_CTRL2 0x104
+#define PHY_CTRL3 0x108
+#define PHY_CTRL4 0x10C
+#define PHY_CTRL5 0x110
+#define PHY_CTRL6 0x114
+#define PHY_STAT1 0x130
+#define PHY_STAT2 0x134
+
+#define IOMUX_ENABLE_SHIFT 31
+#define IOMUX_ENABLE_MASK BIT(IOMUX_ENABLE_SHIFT)
+#define OTAPDLYENA_SHIFT 20
+#define OTAPDLYENA_MASK BIT(OTAPDLYENA_SHIFT)
+#define OTAPDLYSEL_SHIFT 12
+#define OTAPDLYSEL_MASK GENMASK(15, 12)
+#define STRBSEL_SHIFT 24
+#define STRBSEL_MASK GENMASK(27, 24)
+#define SEL50_SHIFT 8
+#define SEL50_MASK BIT(SEL50_SHIFT)
+#define SEL100_SHIFT 9
+#define SEL100_MASK BIT(SEL100_SHIFT)
+#define DLL_TRIM_ICP_SHIFT 4
+#define DLL_TRIM_ICP_MASK GENMASK(7, 4)
+#define DR_TY_SHIFT 20
+#define DR_TY_MASK GENMASK(22, 20)
+#define ENDLL_SHIFT 1
+#define ENDLL_MASK BIT(ENDLL_SHIFT)
+#define DLLRDY_SHIFT 0
+#define DLLRDY_MASK BIT(DLLRDY_SHIFT)
+#define PDB_SHIFT 0
+#define PDB_MASK BIT(PDB_SHIFT)
+#define CALDONE_SHIFT 1
+#define CALDONE_MASK BIT(CALDONE_SHIFT)
+#define RETRIM_SHIFT 17
+#define RETRIM_MASK BIT(RETRIM_SHIFT)
+
+#define DRIVER_STRENGTH_50_OHM 0x0
+#define DRIVER_STRENGTH_33_OHM 0x1
+#define DRIVER_STRENGTH_66_OHM 0x2
+#define DRIVER_STRENGTH_100_OHM 0x3
+#define DRIVER_STRENGTH_40_OHM 0x4
+
#define AM654_SDHCI_MIN_FREQ 400000
struct am654_sdhci_plat {
struct mmc_config cfg;
struct mmc mmc;
unsigned int f_max;
+ struct regmap *base;
+ bool non_removable;
+ u32 otap_del_sel;
+ u32 trm_icp;
+ u32 drv_strength;
+ bool dll_on;
};
+static int am654_sdhci_set_ios_post(struct sdhci_host *host)
+{
+ struct udevice *dev = host->mmc->dev;
+ struct am654_sdhci_plat *plat = dev_get_platdata(dev);
+ unsigned int speed = host->mmc->clock;
+ int sel50, sel100;
+ u32 mask, val;
+ int ret;
+
+ /* Reset SD Clock Enable */
+ val = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+ val &= ~SDHCI_CLOCK_CARD_EN;
+ sdhci_writew(host, val, SDHCI_CLOCK_CONTROL);
+
+ /* power off phy */
+ if (plat->dll_on) {
+ regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK, 0);
+
+ plat->dll_on = false;
+ }
+
+ /* restart clock */
+ sdhci_set_clock(host->mmc, speed);
+
+ /* switch phy back on */
+ if (speed > AM654_SDHCI_MIN_FREQ) {
+ mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
+ val = (1 << OTAPDLYENA_SHIFT) |
+ (plat->otap_del_sel << OTAPDLYSEL_SHIFT);
+ regmap_update_bits(plat->base, PHY_CTRL4,
+ mask, val);
+ switch (speed) {
+ case 200000000:
+ sel50 = 0;
+ sel100 = 0;
+ break;
+ case 100000000:
+ sel50 = 0;
+ sel100 = 1;
+ break;
+ default:
+ sel50 = 1;
+ sel100 = 0;
+ }
+
+ /* Configure PHY DLL frequency */
+ mask = SEL50_MASK | SEL100_MASK;
+ val = (sel50 << SEL50_SHIFT) | (sel100 << SEL100_SHIFT);
+ regmap_update_bits(plat->base, PHY_CTRL5,
+ mask, val);
+ /* Configure DLL TRIM */
+ mask = DLL_TRIM_ICP_MASK;
+ val = plat->trm_icp << DLL_TRIM_ICP_SHIFT;
+
+ /* Configure DLL driver strength */
+ mask |= DR_TY_MASK;
+ val |= plat->drv_strength << DR_TY_SHIFT;
+ regmap_update_bits(plat->base, PHY_CTRL1,
+ mask, val);
+ /* Enable DLL */
+ regmap_update_bits(plat->base, PHY_CTRL1,
+ ENDLL_MASK, 0x1 << ENDLL_SHIFT);
+ /*
+ * Poll for DLL ready. Use a one second timeout.
+ * Works in all experiments done so far
+ */
+ ret = regmap_read_poll_timeout(plat->base,
+ PHY_STAT1, val,
+ val & DLLRDY_MASK,
+ 1000000);
+ if (ret)
+ return ret;
+
+ plat->dll_on = true;
+ }
+
+ return 0;
+}
+
+const struct sdhci_ops am654_sdhci_ops = {
+ .set_ios_post = &am654_sdhci_set_ios_post,
+};
+
+int am654_sdhci_init(struct am654_sdhci_plat *plat)
+{
+ int ctl_cfg_2 = 0;
+ u32 mask, val;
+ int ret;
+
+ /* Reset OTAP to default value */
+ mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
+ regmap_update_bits(plat->base, PHY_CTRL4, mask, 0x0);
+
+ regmap_read(plat->base, PHY_STAT1, &val);
+ if (~val & CALDONE_MASK) {
+ /* Calibrate IO lines */
+ regmap_update_bits(plat->base, PHY_CTRL1,
+ PDB_MASK, PDB_MASK);
+ ret = regmap_read_poll_timeout(plat->base, PHY_STAT1,
+ val, val & CALDONE_MASK,
+ 20);
+ if (ret)
+ return ret;
+ }
+
+ /* Enable pins by setting IO mux to 0 */
+ regmap_update_bits(plat->base, PHY_CTRL1, IOMUX_ENABLE_MASK, 0);
+
+ /* Set slot type based on SD or eMMC */
+ if (plat->non_removable)
+ ctl_cfg_2 = SLOTTYPE_EMBEDDED;
+
+ regmap_update_bits(plat->base, CTL_CFG_2, ctl_cfg_2,
+ SLOTTYPE_MASK);
+
+ return 0;
+}
+
static int am654_sdhci_probe(struct udevice *dev)
{
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
@@ -58,13 +232,18 @@ static int am654_sdhci_probe(struct udevice *dev)
ret = sdhci_setup_cfg(&plat->cfg, host, plat->f_max,
AM654_SDHCI_MIN_FREQ);
- host->mmc = &plat->mmc;
if (ret)
return ret;
+ host->mmc = &plat->mmc;
+ host->ops = &am654_sdhci_ops;
host->mmc->priv = host;
host->mmc->dev = dev;
upriv->mmc = host->mmc;
+ regmap_init_mem_index(dev_ofnode(dev), &plat->base, 1);
+
+ am654_sdhci_init(plat);
+
return sdhci_probe(dev);
}
@@ -72,11 +251,50 @@ static int am654_sdhci_ofdata_to_platdata(struct udevice *dev)
{
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
struct sdhci_host *host = dev_get_priv(dev);
+ struct mmc_config *cfg = &plat->cfg;
+ u32 drv_strength;
+ int ret;
host->name = dev->name;
host->ioaddr = (void *)dev_read_addr(dev);
- host->bus_width = dev_read_u32_default(dev, "bus-width", 4);
- plat->f_max = dev_read_u32_default(dev, "max-frequency", 0);
+ plat->non_removable = !dev_read_bool(dev, "non-removable");
+
+ ret = dev_read_u32(dev, "ti,trm-icp", &plat->trm_icp);
+ if (ret)
+ return ret;
+
+ ret = dev_read_u32(dev, "ti,otap-del-sel", &plat->otap_del_sel);
+ if (ret)
+ return ret;
+
+ ret = dev_read_u32(dev, "ti,driver-strength-ohm", &drv_strength);
+ if (ret)
+ return ret;
+
+ switch (drv_strength) {
+ case 50:
+ plat->drv_strength = DRIVER_STRENGTH_50_OHM;
+ break;
+ case 33:
+ plat->drv_strength = DRIVER_STRENGTH_33_OHM;
+ break;
+ case 66:
+ plat->drv_strength = DRIVER_STRENGTH_66_OHM;
+ break;
+ case 100:
+ plat->drv_strength = DRIVER_STRENGTH_100_OHM;
+ break;
+ case 40:
+ plat->drv_strength = DRIVER_STRENGTH_40_OHM;
+ break;
+ default:
+ dev_err(dev, "Invalid driver strength\n");
+ return -EINVAL;
+ }
+
+ ret = mmc_of_parse(dev, cfg);
+ if (ret)
+ return ret;
return 0;
}
--
2.19.2
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