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[src/trunk]: src/sys/arch/arm/rockchip Add driver for Rockchip I2C controller.



details:   https://anonhg.NetBSD.org/src/rev/6994ed9f6201
branches:  trunk
changeset: 324387:6994ed9f6201
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Jul 01 18:16:58 2018 +0000

description:
Add driver for Rockchip I2C controller.

diffstat:

 sys/arch/arm/rockchip/files.rockchip |    7 +-
 sys/arch/arm/rockchip/rk_i2c.c       |  435 +++++++++++++++++++++++++++++++++++
 2 files changed, 441 insertions(+), 1 deletions(-)

diffs (truncated from 460 to 300 lines):

diff -r 68c145e5580a -r 6994ed9f6201 sys/arch/arm/rockchip/files.rockchip
--- a/sys/arch/arm/rockchip/files.rockchip      Sun Jul 01 18:16:40 2018 +0000
+++ b/sys/arch/arm/rockchip/files.rockchip      Sun Jul 01 18:16:58 2018 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files.rockchip,v 1.13 2018/06/16 00:19:04 jmcneill Exp $
+#      $NetBSD: files.rockchip,v 1.14 2018/07/01 18:16:58 jmcneill Exp $
 #
 # Configuration info for Rockchip family SoCs
 #
@@ -29,6 +29,11 @@
 attach rkgpio at rkiomux with rk_gpio
 file   arch/arm/rockchip/rk_gpio.c             rk_gpio
 
+# I2C
+device rkiic: i2cbus, i2cexec
+attach rkiic at fdt with rk_i2c
+file   arch/arm/rockchip/rk_i2c.c              rk_i2c
+
 # USB PHY
 device rkusb { }
 attach rkusb at fdt with rk_usb
diff -r 68c145e5580a -r 6994ed9f6201 sys/arch/arm/rockchip/rk_i2c.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/rockchip/rk_i2c.c    Sun Jul 01 18:16:58 2018 +0000
@@ -0,0 +1,435 @@
+/* $NetBSD: rk_i2c.c,v 1.1 2018/07/01 18:16:58 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2018 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: rk_i2c.c,v 1.1 2018/07/01 18:16:58 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>
+
+#define        RKI2C_CON               0x000
+#define         RKI2C_CON_ACT2NAK      __BIT(6)
+#define         RKI2C_CON_ACK          __BIT(5)
+#define         RKI2C_CON_STOP         __BIT(4)
+#define         RKI2C_CON_START        __BIT(3)
+#define         RKI2C_CON_I2C_MODE     __BITS(2,1)
+#define          RKI2C_CON_I2C_MODE_TX         0
+#define          RKI2C_CON_I2C_MODE_RTX        1
+#define          RKI2C_CON_I2C_MODE_RX         2
+#define          RKI2C_CON_I2C_MODE_RRX        3
+#define         RKI2C_CON_I2C_EN       __BIT(0)
+
+#define        RKI2C_CLKDIV            0x004
+#define         RKI2C_CLKDIV_CLKDIVH   __BITS(31,16)
+#define         RKI2C_CLKDIV_CLKDIVL   __BITS(15,0)
+
+#define        RKI2C_MRXADDR           0x008
+#define         RKI2C_MRXADDR_ADDHVLD  __BIT(26)
+#define         RKI2C_MRXADDR_ADDMVLD  __BIT(25)
+#define         RKI2C_MRXADDR_ADDLVLD  __BIT(24)
+#define         RKI2C_MRXADDR_SADDR    __BITS(23,0)
+
+#define        RKI2C_MRXRADDR          0x00c
+#define         RKI2C_MRXRADDR_ADDHVLD __BIT(26)
+#define         RKI2C_MRXRADDR_ADDMVLD __BIT(25)
+#define         RKI2C_MRXRADDR_ADDLVLD __BIT(24)
+#define         RKI2C_MRXRADDR_SADDR   __BITS(23,0)
+
+#define        RKI2C_MTXCNT            0x010
+#define         RKI2C_MTXCNT_MTXCNT    __BITS(5,0)
+
+#define        RKI2C_MRXCNT            0x014
+#define         RKI2C_MRXCNT_MRXCNT    __BITS(5,0)
+
+#define        RKI2C_IEN               0x018
+#define         RKI2C_IEN_NAKRCVIEN    __BIT(6)
+#define         RKI2C_IEN_STOPIEN      __BIT(5)
+#define         RKI2C_IEN_STARTIEN     __BIT(4)
+#define         RKI2C_IEN_MBRFIEN      __BIT(3)
+#define         RKI2C_IEN_MBTFIEN      __BIT(2)
+#define         RKI2C_IEN_BRFIEN       __BIT(1)
+#define         RKI2C_IEN_BTFIEN       __BIT(0)
+
+#define        RKI2C_IPD               0x01c
+#define         RKI2C_IPD_NAKRCVIPD    __BIT(6)
+#define         RKI2C_IPD_STOPIPD      __BIT(5)
+#define         RKI2C_IPD_STARTIPD     __BIT(4)
+#define         RKI2C_IPD_MBRFIPD      __BIT(3)
+#define         RKI2C_IPD_MBTFIPD      __BIT(2)
+#define         RKI2C_IPD_BRFIPD       __BIT(1)
+#define         RKI2C_IPD_BTFIPD       __BIT(0)
+
+#define        RKI2C_FCNT              0x020
+#define         RKI2C_FCNT_FCNT        __BITS(5,0)
+
+#define        RKI2C_TXDATA(n)         (0x100 + (n) * 4)
+#define        RKI2C_RXDATA(n)         (0x200 + (n) * 4)
+
+static const char * const compatible[] = {
+       "rockchip,rk3399-i2c",
+       NULL
+};
+
+struct rk_i2c_softc {
+       device_t                sc_dev;
+       bus_space_tag_t         sc_bst;
+       bus_space_handle_t      sc_bsh;
+       struct clk              *sc_sclk;
+       struct clk              *sc_pclk;
+
+       u_int                   sc_clkfreq;
+
+       struct i2c_controller   sc_ic;
+       kmutex_t                sc_lock;
+       kcondvar_t              sc_cv;
+};
+
+#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 void
+rk_i2c_init(struct rk_i2c_softc *sc)
+{
+       int div, divl, divh;
+       u_int rate;
+
+       /*
+        * SCL frequency is calculated by the following formula:
+        *
+        * SCL Divisor = 8 * (CLKDIVL + 1 + CLKDIVH + 1)
+        * SCL = PCLK / SCLK Divisor
+        */
+
+       rate = clk_get_rate(sc->sc_pclk);
+       div = howmany(rate, sc->sc_clkfreq * 8) - 2;
+       if (div >= 0) {
+               divl = div / 2;
+               if (div % 2 == 0)
+                       divh = divl;
+               else
+                       divh = howmany(div, 2);
+       } else {
+               divl = divh = 0;
+       }
+
+       WR4(sc, RKI2C_CLKDIV,
+           __SHIFTIN(divh, RKI2C_CLKDIV_CLKDIVH) |
+           __SHIFTIN(divl, RKI2C_CLKDIV_CLKDIVL));
+
+       /*
+        * Disable the module until we are ready to use it.
+        */
+       WR4(sc, RKI2C_CON, 0);
+       WR4(sc, RKI2C_IEN, 0);
+       WR4(sc, RKI2C_IPD, RD4(sc, RKI2C_IPD));
+}
+
+static int
+rk_i2c_acquire_bus(void *priv, int flags)
+{
+       struct rk_i2c_softc * const sc = priv;
+
+       mutex_enter(&sc->sc_lock);
+
+       return 0;
+}
+
+static void
+rk_i2c_release_bus(void *priv, int flags)
+{
+       struct rk_i2c_softc * const sc = priv;
+
+       mutex_exit(&sc->sc_lock);
+}
+
+static int
+rk_i2c_wait(struct rk_i2c_softc *sc, uint32_t mask)
+{
+       u_int timeo = 100000;
+       uint32_t val;
+
+       const uint32_t ipdmask = mask | RKI2C_IPD_NAKRCVIPD;
+       do {
+               val = RD4(sc, RKI2C_IPD);
+               if (val & ipdmask)
+                       break;
+               delay(1);
+       } while (--timeo > 0);
+
+       WR4(sc, RKI2C_IPD, val & ipdmask);
+
+       if ((val & RKI2C_IPD_NAKRCVIPD) != 0)
+               return EIO;
+       if ((val & mask) != 0)
+               return 0;
+
+       return ETIMEDOUT;
+}
+
+static int
+rk_i2c_start(struct rk_i2c_softc *sc)
+{
+       uint32_t con;
+       int error;
+
+       /* Send start */
+       con = RD4(sc, RKI2C_CON);
+       con |= RKI2C_CON_START;
+       WR4(sc, RKI2C_CON, con);
+
+       if ((error = rk_i2c_wait(sc, RKI2C_IPD_STARTIPD)) != 0)
+               return error;
+
+       con &= ~RKI2C_CON_START;
+       WR4(sc, RKI2C_CON, con);
+
+       return 0;
+}
+
+static int
+rk_i2c_stop(struct rk_i2c_softc *sc)
+{
+       uint32_t con;
+       int error;
+
+       /* Send start */
+       con = RD4(sc, RKI2C_CON);
+       con |= RKI2C_CON_STOP;
+       WR4(sc, RKI2C_CON, con);
+
+       if ((error = rk_i2c_wait(sc, RKI2C_IPD_STOPIPD)) != 0)
+               return error;
+
+       con &= ~RKI2C_CON_STOP;
+       WR4(sc, RKI2C_CON, con);
+
+       return 0;
+}
+
+static int
+rk_i2c_write(struct rk_i2c_softc *sc, i2c_addr_t addr, const uint8_t *buf,
+    size_t buflen, int flags, bool send_start)
+{
+       union {
+               uint8_t data8[32];
+               uint32_t data32[8];
+       } txdata;
+       uint32_t con;
+       u_int mode;
+       int error;
+
+       if (buflen > 31)
+               return EINVAL;
+
+       mode = RKI2C_CON_I2C_MODE_TX;
+       con = RKI2C_CON_I2C_EN | __SHIFTIN(mode, RKI2C_CON_I2C_MODE);
+       WR4(sc, RKI2C_CON, con);
+
+       if (send_start && (error = rk_i2c_start(sc)) != 0)
+               return error;
+
+       /* Transmit data. Slave address goes in the lower 8 bits of TXDATA0 */
+       txdata.data8[0] = addr << 1;
+       memcpy(&txdata.data8[1], buf, buflen);
+       bus_space_write_region_4(sc->sc_bst, sc->sc_bsh, RKI2C_TXDATA(0),
+           txdata.data32, howmany(buflen + 1, 4));
+       WR4(sc, RKI2C_MTXCNT, __SHIFTIN(buflen + 1, RKI2C_MTXCNT_MTXCNT));
+
+       if ((error = rk_i2c_wait(sc, RKI2C_IPD_MBTFIPD)) != 0)



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