Add cdsdhc(4), a driver for the Cadence SD/SDIO/eMMC host controller.

Tested on a PolarFire SoC.

4 files changed, 179 insertions, 3 deletions

diff --git a/sys/arch/riscv64/conf/GENERIC b/sys/arch/riscv64/conf/GENERIC
index 3024748578e..31014e90122 100644
--- a/sys/arch/riscv64/conf/GENERIC
+++ b/sys/arch/riscv64/conf/GENERIC
@@ -1,4 +1,4 @@
-#	$OpenBSD: GENERIC,v 1.32 2022/01/05 03:32:44 visa Exp $
+#	$OpenBSD: GENERIC,v 1.33 2022/01/18 07:53:39 visa Exp $
 #
 # For further information on compiling OpenBSD kernels, see the config(8)
 # man page.
@@ -45,6 +45,8 @@ intc0		at cpu0
 com*		at fdt?
 
 # PolarFire SoCs
+cdsdhc*		at fdt?
+sdmmc*		at cdsdhc?
 mpfclock*	at fdt? early 1
 
 # SiFive SoCs
diff --git a/sys/arch/riscv64/conf/RAMDISK b/sys/arch/riscv64/conf/RAMDISK
index 74993f13161..74397a579a8 100644
--- a/sys/arch/riscv64/conf/RAMDISK
+++ b/sys/arch/riscv64/conf/RAMDISK
@@ -1,4 +1,4 @@
-#	$OpenBSD: RAMDISK,v 1.28 2022/01/05 03:32:44 visa Exp $
+#	$OpenBSD: RAMDISK,v 1.29 2022/01/18 07:53:39 visa Exp $
 
 machine		riscv64
 maxusers	4
@@ -36,6 +36,8 @@ intc0		at cpu0
 com*		at fdt?
 
 # PolarFire SoCs
+cdsdhc*		at fdt?
+sdmmc*		at cdsdhc?
 mpfclock*	at fdt? early 1
 
 # SiFive SoCs
diff --git a/sys/dev/fdt/cdsdhc.c b/sys/dev/fdt/cdsdhc.c
new file mode 100644
index 00000000000..df3b760b43b
--- /dev/null
+++ b/sys/dev/fdt/cdsdhc.c
@@ -0,0 +1,168 @@
+/*	$OpenBSD: cdsdhc.c,v 1.1 2022/01/18 07:53:39 visa Exp $	*/
+
+/*
+ * Copyright (c) 2022 Visa Hankala
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Driver glue for Cadence SD/SDIO/eMMC host controller.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/device.h>
+
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/fdt.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_clock.h>
+
+#include <dev/sdmmc/sdhcvar.h>
+#include <dev/sdmmc/sdmmcvar.h>
+
+/* Host Register Set */
+#define HRS06				0x0018
+#define  HRS06_ETR				(0x1 << 15)
+#define  HRS06_ETV_MASK				(0x3f << 8)
+#define  HRS06_ETV_SHIFT			8
+#define  HRS06_EMM_MASK				(0x7 << 0)
+#define  HRS06_EMM_SD				(0x0 << 0)
+#define  HRS06_EMM_MMC_SDR			(0x2 << 0)
+#define  HRS06_EMM_MMC_DDR			(0x3 << 0)
+#define  HRS06_EMM_MMC_HS200			(0x4 << 0)
+#define  HRS06_EMM_MMC_HS400			(0x5 << 0)
+#define  HRS06_EMM_MMC_HS400_ENH		(0x6 << 0)
+#define HRS31				0x007c
+#define  HRS31_HOSTCTLVER(x)			(((x) >> 16) & 0xfff)
+#define  HRS31_HOSTFIXVER(x)			((x) & 0xff)
+
+/* Slot Register Set */
+#define SRS_OFFSET			0x200
+#define SRS_SIZE			0x100
+
+struct cdsdhc_softc {
+	struct sdhc_softc	sc_sdhc;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+	bus_space_handle_t	sc_srs_ioh;
+	void			*sc_ih;
+
+	struct sdhc_host	*sc_host;
+};
+
+#define HREAD4(sc, reg) \
+	(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
+#define HWRITE4(sc, reg, val) \
+	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
+
+int	cdsdhc_match(struct device *, void *, void*);
+void	cdsdhc_attach(struct device *, struct device *, void *);
+void	cdsdhc_bus_clock_pre(struct sdhc_softc *, int, int);
+
+const struct cfattach cdsdhc_ca = {
+	sizeof(struct cdsdhc_softc), cdsdhc_match, cdsdhc_attach
+};
+
+struct cfdriver cdsdhc_cd = {
+	NULL, "cdsdhc", DV_DULL
+};
+
+int
+cdsdhc_match(struct device *parent, void *match, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+
+	if (faa->fa_nreg < 1)
+		return 0;
+	return OF_is_compatible(faa->fa_node, "cdns,sd4hc");
+}
+
+void
+cdsdhc_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+	struct cdsdhc_softc *sc = (struct cdsdhc_softc *)self;
+	uint32_t caps = 0;
+	uint32_t ver;
+
+	sc->sc_iot = faa->fa_iot;
+
+	if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, faa->fa_reg[0].size,
+	    0, &sc->sc_ioh) != 0) {
+		printf(": can't map registers\n");
+		return;
+	}
+
+	if (bus_space_subregion(sc->sc_iot, sc->sc_ioh, SRS_OFFSET, SRS_SIZE,
+	    &sc->sc_srs_ioh) != 0) {
+		printf(": can't map SRS subregion\n");
+		goto unmap;
+	}
+
+	clock_enable_all(faa->fa_node);
+
+	sc->sc_ih = fdt_intr_establish(faa->fa_node, IPL_BIO,
+	    sdhc_intr, sc, sc->sc_sdhc.sc_dev.dv_xname);
+	if (sc->sc_ih == NULL) {
+		printf(": can't establish interrupt\n");
+		goto disable;
+	}
+
+	ver = HREAD4(sc, HRS31);
+	printf(": rev 0x%x/0x%x\n", HRS31_HOSTCTLVER(ver),
+	    HRS31_HOSTFIXVER(ver));
+
+	sc->sc_sdhc.sc_host = &sc->sc_host;
+	sc->sc_sdhc.sc_dmat = faa->fa_dmat;
+	sc->sc_sdhc.sc_bus_clock_pre = cdsdhc_bus_clock_pre;
+	sdhc_host_found(&sc->sc_sdhc, sc->sc_iot, sc->sc_srs_ioh, SRS_SIZE,
+	    1, caps);
+	return;
+
+disable:
+	clock_disable_all(faa->fa_node);
+unmap:
+	bus_space_unmap(sc->sc_iot, sc->sc_ioh, faa->fa_reg[0].size);
+}
+
+void
+cdsdhc_bus_clock_pre(struct sdhc_softc *sc_sdhc, int freq, int timing)
+{
+	struct cdsdhc_softc *sc = (struct cdsdhc_softc *)sc_sdhc;
+	uint32_t mode, val;
+
+	switch (timing) {
+	case SDMMC_TIMING_HIGHSPEED:
+		mode = HRS06_EMM_MMC_SDR;
+		break;
+	case SDMMC_TIMING_MMC_DDR52:
+		mode = HRS06_EMM_MMC_DDR;
+		break;
+	case SDMMC_TIMING_MMC_HS200:
+		mode = HRS06_EMM_MMC_HS200;
+		break;
+	default:
+		mode = HRS06_EMM_SD;
+		break;
+	}
+
+	val = HREAD4(sc, HRS06);
+	val &= ~HRS06_EMM_MASK;
+	val |= mode;
+	HWRITE4(sc, HRS06, val);
+}
diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index cfc14e7b7ec..569db67c783 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.160 2021/11/21 11:02:21 kettenis Exp $
+#	$OpenBSD: files.fdt,v 1.161 2022/01/18 07:53:39 visa Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -289,6 +289,10 @@ device	cad: ether, ifnet, mii, ifmedia
 attach	cad at fdt
 file	dev/fdt/if_cad.c		cad
 
+device	cdsdhc: sdmmcbus, sdhc
+attach	cdsdhc at fdt
+file	dev/fdt/cdsdhc.c		cdsdhc
+
 device	cduart
 attach	cduart at fdt
 file	dev/fdt/cduart.c		cduart