[src/trunk]: src/sys/arch/arm/sociox enrich I2C driver realities to work a bit

[nisimura <nisimura%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f87c650dac00
branches:  trunk
changeset: 745971:f87c650dac00
user:      nisimura <nisimura%NetBSD.org@localhost>
date:      Wed Mar 18 07:49:01 2020 +0000

description:
enrich I2C driver realities to work a bit

diffstat:

 sys/arch/arm/sociox/sni_i2c.c |  248 ++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 237 insertions(+), 11 deletions(-)

diffs (truncated from 309 to 300 lines):

diff -r 72bba33e54eb -r f87c650dac00 sys/arch/arm/sociox/sni_i2c.c
--- a/sys/arch/arm/sociox/sni_i2c.c     Wed Mar 18 06:44:57 2020 +0000
+++ b/sys/arch/arm/sociox/sni_i2c.c     Wed Mar 18 07:49:01 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sni_i2c.c,v 1.2 2020/03/18 05:02:48 nisimura Exp $     */
+/*     $NetBSD: sni_i2c.c,v 1.3 2020/03/18 07:49:01 nisimura Exp $     */
 
 /*-
  * Copyright (c) 2020 The NetBSD Foundation, Inc.
@@ -34,21 +34,30 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sni_i2c.c,v 1.2 2020/03/18 05:02:48 nisimura Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sni_i2c.c,v 1.3 2020/03/18 07:49:01 nisimura Exp $");
+
+#ifdef I2CDEBUG
+#define DPRINTF(args)  printf args
+#else
+#define DPRINTF(args)
+#endif
 
 #include <sys/param.h>
 #include <sys/bus.h>
 #include <sys/intr.h>
 #include <sys/device.h>
+#include <sys/mutex.h>
+#include <sys/condvar.h>
 #include <sys/errno.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>
 
-#include <machine/endian.h>
+#include <dev/i2c/i2cvar.h>
 
 #include <dev/fdt/fdtvar.h>
 #include <dev/acpi/acpireg.h>
 #include <dev/acpi/acpivar.h>
+#include <dev/acpi/acpi_intr.h>
 
 static int sniiic_fdt_match(device_t, struct cfdata *, void *);
 static void sniiic_fdt_attach(device_t, device_t, void *);
@@ -56,7 +65,19 @@
 static void sniiic_acpi_attach(device_t, device_t, void *);
 
 struct sniiic_softc {
-       device_t sc_dev;
+       device_t                sc_dev;
+       struct i2c_controller   sc_ic;
+       device_t                sc_i2cdev;
+       bus_space_tag_t         sc_iot;
+       bus_space_handle_t      sc_ioh;
+       bus_addr_t              sc_iob;
+       bus_size_t              sc_ios;
+       void                    *sc_ih;
+       kmutex_t                sc_lock;
+       kmutex_t                sc_mtx;
+       kcondvar_t              sc_cv;
+       int                     sc_opflags;
+       bool                    sc_busy;
 };
 
 CFATTACH_DECL_NEW(sniiic_fdt, sizeof(struct sniiic_softc),
@@ -65,7 +86,19 @@
 CFATTACH_DECL_NEW(sniiic_acpi, sizeof(struct sniiic_softc),
     sniiic_acpi_match, sniiic_acpi_attach, NULL, NULL);
 
-static int sniiic_attach_i(struct sniiic_softc *);
+static int sniiic_acquire_bus(void *, int);
+static void sniiic_release_bus(void *, int);
+static int sniiic_exec(void *, i2c_op_t, i2c_addr_t, const void *,
+                       size_t, void *, size_t, int);
+
+static int sniiic_intr(void *);
+static void sniiic_reset(struct sniiic_softc *);
+static void sniiic_flush(struct sniiic_softc *);
+
+static i2c_tag_t sniiic_get_tag(device_t);
+static const struct fdtbus_i2c_controller_func sniiic_funcs = {
+       .get_tag = sniiic_get_tag,
+};
 
 static int
 sniiic_fdt_match(device_t parent, struct cfdata *match, void *aux)
@@ -83,10 +116,69 @@
 sniiic_fdt_attach(device_t parent, device_t self, void *aux)
 {
        struct sniiic_softc * const sc = device_private(self);
+       struct fdt_attach_args * const faa = aux;
+       prop_dictionary_t dict = device_properties(self);
+       const int phandle = faa->faa_phandle;
+       bus_space_handle_t ioh;
+       bus_addr_t addr;
+       bus_size_t size;
+       void *ih;
+       char intrstr[128];
+       _Bool disable;
        int error;
 
-       error = sniiic_attach_i(sc);
-       (void)error;
+       prop_dictionary_get_bool(dict, "disable", &disable);
+       if (disable) {
+               aprint_naive(": disabled\n");
+               aprint_normal(": disabled\n");
+               return;
+       }
+       error = fdtbus_get_reg(phandle, 0, &addr, &size);
+       if (error) {
+               aprint_error(": couldn't get registers\n");
+               return;
+       }
+       error = bus_space_map(faa->faa_bst, addr, size, 0, &ioh);
+       if (error) {
+               aprint_error(": unable to map device\n");
+               return;
+       }
+       error = fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr));
+       if (error) {
+               aprint_error(": failed to decode interrupt\n");
+               return;
+       }
+
+       aprint_naive(": I2C controller\n");
+       aprint_normal(": I2C controller\n");
+
+       sc->sc_dev = self;
+       sc->sc_iot = faa->faa_bst;
+       sc->sc_ioh = ioh;
+       sc->sc_iob = addr;
+       sc->sc_ios = size;
+       mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
+       mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_NET);
+       cv_init(&sc->sc_cv, "sniiic");
+       sc->sc_ic.ic_cookie = sc;
+       sc->sc_ic.ic_acquire_bus = sniiic_acquire_bus;
+       sc->sc_ic.ic_release_bus = sniiic_release_bus;
+       sc->sc_ic.ic_exec = sniiic_exec;
+
+       ih = fdtbus_intr_establish(phandle, 0, IPL_NET, 0, sniiic_intr, sc);
+       if (ih == NULL) {
+               aprint_error_dev(self, "couldn't establish interrupt\n");
+               goto fail;
+       }
+       sc->sc_ih = ih;
+
+       fdtbus_register_i2c_controller(self, phandle, &sniiic_funcs);
+       fdtbus_attach_i2cbus(self, phandle, &sc->sc_ic, iicbus_print);
+
+       return;
+ fail:
+       bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios);
+       return;
 }
 
 static int
@@ -107,14 +199,148 @@
 sniiic_acpi_attach(device_t parent, device_t self, void *aux)
 {
        struct sniiic_softc * const sc = device_private(self);
-       int error;
+       struct acpi_attach_args *aa = aux;
+       bus_space_handle_t ioh;
+       struct acpi_resources res;
+       struct acpi_mem *mem;
+       struct acpi_irq *irq;
+       ACPI_STATUS rv;
+       void *ih;
+
+       rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS",
+           &res, &acpi_resource_parse_ops_default);
+       if (ACPI_FAILURE(rv))
+               return;
+
+       mem = acpi_res_mem(&res, 0);
+       irq = acpi_res_irq(&res, 0);
+       if (mem == NULL || irq == NULL) {
+               aprint_error(": incomplete resources\n");
+               return;
+       }
+       if (mem->ar_length == 0) {
+               aprint_error(": zero length memory resource\n");
+               return;
+       }
+       if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0,
+           &ioh)) {
+               aprint_error(": couldn't map registers\n");
+               return;
+       }
 
-       error = sniiic_attach_i(sc);
-       (void)error;
+       aprint_naive(": I2C controller\n");
+       aprint_normal(": I2C controller\n");
+
+       sc->sc_dev = self;
+       sc->sc_iot = aa->aa_memt;
+       sc->sc_ioh = ioh;
+       sc->sc_iob = mem->ar_base;
+       sc->sc_ios = mem->ar_length;
+       mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
+       mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_NET);
+       cv_init(&sc->sc_cv, "sniiic");
+       sc->sc_ic.ic_cookie = sc;
+       sc->sc_ic.ic_acquire_bus = sniiic_acquire_bus;
+       sc->sc_ic.ic_release_bus = sniiic_release_bus;
+       sc->sc_ic.ic_exec = sniiic_exec;
+
+       ih = acpi_intr_establish(self,
+           (uint64_t)(uintptr_t)aa->aa_node->ad_handle,
+           IPL_BIO, false, sniiic_intr, sc, device_xname(self));
+       if (ih == NULL) {
+               aprint_error_dev(self, "couldn't establish interrupt\n");
+               goto fail;
+       }
+       sc->sc_ih = ih;
+
+       acpi_resource_cleanup(&res);
+
+       return;
+ fail:
+       bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios);
+       acpi_resource_cleanup(&res);
+       return;
 }
 
 static int
-sniiic_attach_i(struct sniiic_softc *sc)
+sniiic_acquire_bus(void *opaque, int flags)
 {
+       struct sniiic_softc *sc = opaque;
+
+       mutex_enter(&sc->sc_lock);
+       while (sc->sc_busy)
+               cv_wait(&sc->sc_cv, &sc->sc_lock);
+       sc->sc_busy = true;
+       mutex_exit(&sc->sc_lock);
+
        return 0;
 }
+
+static void
+sniiic_release_bus(void *opaque, int flags)
+{
+       struct sniiic_softc *sc = opaque;
+
+       mutex_enter(&sc->sc_lock);
+       sc->sc_busy = false;
+       cv_broadcast(&sc->sc_cv);
+       mutex_exit(&sc->sc_lock);
+}
+
+static int
+sniiic_exec(void *opaque, i2c_op_t op, i2c_addr_t addr,
+    const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags)
+{
+       struct sniiic_softc *sc = opaque;
+       int err;
+
+       DPRINTF(("sniic_exec: op 0x%x cmdlen %zd len %zd flags 0x%x\n",
+           op, cmdlen, len, flags));
+       err = 0;
+       /* AAA */
+       goto done;
+ done:
+       if (err)
+               sniiic_reset(sc);
+       sniiic_flush(sc);
+       DPRINTF(("sniiic_exec: done %d\n", err));
+       return err;
+}
+
+static int
+sniiic_intr(void *arg)
+{
+       struct sniiic_softc * const sc = arg;
+       uint32_t stat = 0;
+
+       mutex_enter(&sc->sc_mtx);
+       DPRINTF(("sniiic_intr opflags=%#x\n", sc->sc_opflags));
+       if ((sc->sc_opflags & I2C_F_POLL) == 0) {
+               /* AAA */
+               (void)stat;
+               cv_broadcast(&sc->sc_cv);
+       }
+       mutex_exit(&sc->sc_mtx);
+       DPRINTF(("sniiic_intr status 0x%x\n", stat));
+       return 1;
+}
+
+static void
+sniiic_reset(struct sniiic_softc *sc)
+{
+       /* AAA */
+}
+
+static void
+sniiic_flush(struct sniiic_softc *sc)
+{
+       /* AAA */