Source-Changes-HG archive
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
[src/trunk]: src/sys Add driver for Cadence I2C controller.
details: https://anonhg.NetBSD.org/src/rev/991b45293f7f
branches: trunk
changeset: 372270:991b45293f7f
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sat Nov 05 17:31:37 2022 +0000
description:
Add driver for Cadence I2C controller.
diffstat:
sys/conf/files | 7 +-
sys/dev/fdt/cdnsiic_fdt.c | 103 +++++++++++++++
sys/dev/fdt/files.fdt | 6 +-
sys/dev/ic/cdnsiic.c | 297 ++++++++++++++++++++++++++++++++++++++++++++++
sys/dev/ic/cdnsiicvar.h | 50 +++++++
5 files changed, 461 insertions(+), 2 deletions(-)
diffs (truncated from 503 to 300 lines):
diff -r e19dc7bf9e30 -r 991b45293f7f sys/conf/files
--- a/sys/conf/files Sat Nov 05 17:30:06 2022 +0000
+++ b/sys/conf/files Sat Nov 05 17:31:37 2022 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files,v 1.1302 2022/10/28 07:16:34 skrll Exp $
+# $NetBSD: files,v 1.1303 2022/11/05 17:31:38 jmcneill Exp $
# @(#)files.newconf 7.5 (Berkeley) 5/10/93
version 20171118
@@ -1159,6 +1159,11 @@
device dwiic: dwiic, i2cbus
file dev/ic/dwiic.c dwiic
+# Cadence I2C controller
+define cdnsiic
+device cdnsiic: i2cbus
+file dev/ic/cdnsiic.c cdnsiic
+
# ACPI power management timer (hardware access, independent of ACPI)
#
define acpipmtimer
diff -r e19dc7bf9e30 -r 991b45293f7f sys/dev/fdt/cdnsiic_fdt.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/cdnsiic_fdt.c Sat Nov 05 17:31:37 2022 +0000
@@ -0,0 +1,103 @@
+/* $NetBSD: cdnsiic_fdt.c,v 1.1 2022/11/05 17:31:37 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2022 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+
+__KERNEL_RCSID(0, "$NetBSD: cdnsiic_fdt.c,v 1.1 2022/11/05 17:31:37 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/intr.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+#include <sys/kmem.h>
+
+#include <dev/i2c/i2cvar.h>
+
+#include <dev/fdt/fdtvar.h>
+#include <dev/ic/cdnsiicvar.h>
+
+static const struct device_compatible_entry compat_data[] = {
+ { .compat = "cdns,i2c-r1p10" },
+ { .compat = "cdns,i2c-r1p14" },
+ DEVICE_COMPAT_EOL
+};
+
+static int
+cdnsiic_fdt_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_compatible_match(faa->faa_phandle, compat_data);
+}
+
+static void
+cdnsiic_fdt_attach(device_t parent, device_t self, void *aux)
+{
+ struct cdnsiic_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ bus_addr_t addr;
+ bus_size_t size;
+ int error;
+
+ if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
+ aprint_error(": couldn't get registers\n");
+ return;
+ }
+
+ sc->sc_pclk = fdtbus_clock_get_index(phandle, 0);
+ if (sc->sc_pclk == NULL || clk_enable(sc->sc_pclk) != 0) {
+ aprint_error(": couldn't enable pclk\n");
+ return;
+ }
+
+ if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_bus_freq))
+ sc->sc_bus_freq = 100000;
+
+ sc->sc_dev = self;
+ sc->sc_bst = faa->faa_bst;
+ if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
+ aprint_error(": couldn't map registers\n");
+ return;
+ }
+
+ error = cdnsiic_attach(sc);
+ if (error != 0) {
+ aprint_error_dev(self, "init failed, error = %d\n", error);
+ return;
+ }
+
+ fdtbus_register_i2c_controller(&sc->sc_ic, phandle);
+
+ fdtbus_attach_i2cbus(self, phandle, &sc->sc_ic, iicbus_print);
+}
+
+CFATTACH_DECL_NEW(cdnsiic_fdt, sizeof(struct cdnsiic_softc),
+ cdnsiic_fdt_match, cdnsiic_fdt_attach, NULL, NULL);
diff -r e19dc7bf9e30 -r 991b45293f7f sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt Sat Nov 05 17:30:06 2022 +0000
+++ b/sys/dev/fdt/files.fdt Sat Nov 05 17:31:37 2022 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.65 2022/07/20 10:01:11 riastradh Exp $
+# $NetBSD: files.fdt,v 1.66 2022/11/05 17:31:37 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -185,6 +185,10 @@
attach dwiic at fdt with dwiic_fdt
file dev/fdt/dwiic_fdt.c dwiic_fdt
+# Cadence I2C
+attach cdnsiic at fdt with cdnsiic_fdt
+file dev/fdt/cdnsiic_fdt.c cdnsiic_fdt
+
# AMD Cryptographic Coprocessor
attach amdccp at fdt with amdccp_fdt
file dev/fdt/amdccp_fdt.c amdccp_fdt
diff -r e19dc7bf9e30 -r 991b45293f7f sys/dev/ic/cdnsiic.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/ic/cdnsiic.c Sat Nov 05 17:31:37 2022 +0000
@@ -0,0 +1,297 @@
+/* $NetBSD: cdnsiic.c,v 1.1 2022/11/05 17:31:37 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2022 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Cadence I2C controller
+ */
+
+#include <sys/cdefs.h>
+
+__KERNEL_RCSID(0, "$NetBSD: cdnsiic.c,v 1.1 2022/11/05 17:31:37 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/intr.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+#include <sys/kmem.h>
+
+#include <dev/clk/clk.h>
+#include <dev/i2c/i2cvar.h>
+
+#include <dev/ic/cdnsiicvar.h>
+
+/* From Zynq-7000 SoC Technical Reference Manual, "Supports 16-byte FIFO" */
+#define FIFO_DEPTH 16
+
+/* Poll timeout, in microseconds. */
+#define POLL_TIMEOUT 10000
+
+#define CR_REG 0x00
+#define CR_DIV_A __BITS(15,14)
+#define CR_DIV_B __BITS(13,8)
+#define CR_CLR_FIFO __BIT(6)
+#define CR_HOLD __BIT(4)
+#define CR_ACKEN __BIT(3)
+#define CR_NEA __BIT(2)
+#define CR_MS __BIT(1)
+#define CR_RD_WR __BIT(0)
+#define SR_REG 0x04
+#define SR_TXDV __BIT(6)
+#define SR_RXDV __BIT(5)
+#define ADDR_REG 0x08
+#define DATA_REG 0x0c
+#define ISR_REG 0x10
+#define ISR_ARB_LOST __BIT(9)
+#define ISR_RX_UNF __BIT(7)
+#define ISR_TX_OVR __BIT(6)
+#define ISR_RX_OVR __BIT(5)
+#define ISR_SLV_RDY __BIT(4)
+#define ISR_TO __BIT(3)
+#define ISR_NACK __BIT(2)
+#define ISR_DATA __BIT(1)
+#define ISR_COMP __BIT(0)
+#define ISR_ERROR_MASK (ISR_ARB_LOST | ISR_TX_OVR | ISR_RX_OVR | ISR_NACK)
+#define TRANS_SIZE_REG 0x14
+#define SLV_PAUSE_REG 0x18
+#define TIME_OUT_REG 0x1c
+#define IMR_REG 0x20
+#define IER_REG 0x24
+#define IDR_REG 0x28
+
+#define RD4(sc, reg) \
+ bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
+#define WR4(sc, reg, val) \
+ bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
+
+static int
+cdnsiic_init(struct cdnsiic_softc *sc)
+{
+ int diva, divb;
+ int diff, calc_bus_freq;
+ int best_diva, best_divb, best_diff;
+ u_int pclk;
+
+ /*
+ * SCL frequency is calculated by the following formula:
+ *
+ * SCL Divisor = 22 * (divisor_a + 1) * (divisor_b + 1)
+ * SCL = PCLK / SCLK Divisor
+ */
+
+ pclk = clk_get_rate(sc->sc_pclk);
+ best_diff = sc->sc_bus_freq;
+ best_diva = best_divb = 0;
+
+ for (diva = 0; diva <= 0x3; diva++) {
+ divb = howmany(pclk, 22 * sc->sc_bus_freq * (diva + 1)) - 1;
+ if (divb < 0 || divb > 0x3f) {
+ continue;
+ }
+ calc_bus_freq = pclk / (22 * (diva + 1) * (divb + 1));
+ diff = sc->sc_bus_freq - calc_bus_freq;
+ if (diff < best_diff) {
+ best_diff = diff;
+ best_diva = diva;
+ best_divb = divb;
+ }
+ }
+ if (best_diff == sc->sc_bus_freq) {
+ return ENXIO;
+ }
+
+ WR4(sc, CR_REG,
+ __SHIFTIN(best_diva, CR_DIV_A) |
+ __SHIFTIN(best_divb, CR_DIV_B) |
+ CR_CLR_FIFO |
+ CR_ACKEN |
+ CR_NEA |
+ CR_MS);
+ WR4(sc, TIME_OUT_REG, 0xff);
+
+ return 0;
+}
+
+static int
+cdnsiic_poll_fifo(struct cdnsiic_softc *sc, uint32_t sr_mask, uint32_t sr_maskval)
+{
+ uint32_t sr_val, isr_val;
+ int retry = POLL_TIMEOUT;
+
+ while (--retry > 0) {
+ sr_val = RD4(sc, SR_REG);
Home |
Main Index |
Thread Index |
Old Index