From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55816) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bCUiR-0006Qh-9N for qemu-devel@nongnu.org; Mon, 13 Jun 2016 12:28:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bCUiL-0000rx-Hm for qemu-devel@nongnu.org; Mon, 13 Jun 2016 12:27:54 -0400 Received: from greensocs.com ([193.104.36.180]:57831) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bCUiL-0000rr-7D for qemu-devel@nongnu.org; Mon, 13 Jun 2016 12:27:49 -0400 From: fred.konrad@greensocs.com Date: Mon, 13 Jun 2016 18:27:31 +0200 Message-Id: <1465835259-21449-4-git-send-email-fred.konrad@greensocs.com> In-Reply-To: <1465835259-21449-1-git-send-email-fred.konrad@greensocs.com> References: <1465835259-21449-1-git-send-email-fred.konrad@greensocs.com> Subject: [Qemu-devel] [RFC PATCH 03/11] qemu-clk: allow to bound two clocks together List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, edgar.iglesias@xilinx.com, alistair.francis@xilinx.com, mark.burton@greensocs.com, fred.konrad@greensocs.com From: KONRAD Frederic This introduces the clock binding and the update part. When the qemu_clk_rate_update(qemu_clk, int) function is called: * The clock callback is called on the qemu_clk so it can change the rate. * The qemu_clk_rate_update function is called on all the driven clock. Signed-off-by: KONRAD Frederic --- include/qemu/qemu-clock.h | 65 +++++++++++++++++++++++++++++++++++++++++++++++ qemu-clock.c | 56 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 121 insertions(+) diff --git a/include/qemu/qemu-clock.h b/include/qemu/qemu-clock.h index a2ba105..677de9a 100644 --- a/include/qemu/qemu-clock.h +++ b/include/qemu/qemu-clock.h @@ -27,15 +27,29 @@ #include "qemu/osdep.h" #include "qom/object.h" +typedef float (*qemu_clk_on_rate_update_cb)(void *opaque, float rate); + #define TYPE_CLOCK "qemu-clk" #define QEMU_CLOCK(obj) OBJECT_CHECK(struct qemu_clk, (obj), TYPE_CLOCK) +typedef struct ClkList ClkList; + typedef struct qemu_clk { /*< private >*/ Object parent_obj; char *name; /* name of this clock in the device. */ + float in_rate; /* rate of the clock which drive this pin. */ + float out_rate; /* rate of this clock pin. */ + void *opaque; + qemu_clk_on_rate_update_cb cb; + QLIST_HEAD(, ClkList) bound; } *qemu_clk; +struct ClkList { + qemu_clk clk; + QLIST_ENTRY(ClkList) node; +}; + /** * qemu_clk_attach_to_device: * @d: the device on which the clock need to be attached. @@ -59,4 +73,55 @@ void qemu_clk_attach_to_device(DeviceState *d, qemu_clk clk, */ qemu_clk qemu_clk_get_pin(DeviceState *d, const char *name); +/** + * qemu_clk_bound_clock: + * @out: the clock output. + * @in: the clock input. + * + * Connect the clock together. This is unidirectionnal so a + * qemu_clk_update_rate will go from @out to @in. + * + */ +void qemu_clk_bound_clock(qemu_clk out, qemu_clk in); + +/** + * qemu_clk_unbound: + * @out: the clock output. + * @in: the clock input. + * + * Disconnect the clock if they were bound together. + * + */ +void qemu_clk_unbound(qemu_clk out, qemu_clk in); + +/** + * qemu_clk_update_rate: + * @clk: the clock to update. + * @rate: the new rate. + * + * Update the @clk to the new @rate. + * + */ +void qemu_clk_update_rate(qemu_clk clk, float rate); + +/** + * qemu_clk_refresh: + * @clk: the clock to be refreshed. + * + * This updates all childs of a clock without changing its own rate. + * + */ +void qemu_clk_refresh(qemu_clk clk); + +/** + * qemu_clk_set_callback: + * @clk: the clock where to set the callback. + * @cb: the callback to associate to the callback. + * @opaque: the opaque data passed to the calback. + * + */ +void qemu_clk_set_callback(qemu_clk clk, + qemu_clk_on_rate_update_cb cb, + void *opaque); + #endif /* QEMU_CLOCK_H */ diff --git a/qemu-clock.c b/qemu-clock.c index 81f2852..811d6a0 100644 --- a/qemu-clock.c +++ b/qemu-clock.c @@ -34,6 +34,62 @@ do { printf("qemu-clock: " fmt , ## __VA_ARGS__); } while (0) #define DPRINTF(fmt, ...) do { } while (0) #endif +void qemu_clk_refresh(qemu_clk clk) +{ + qemu_clk_update_rate(clk, clk->in_rate); +} + +void qemu_clk_update_rate(qemu_clk clk, float rate) +{ + ClkList *child; + + clk->in_rate = rate; + clk->out_rate = rate; + + if (clk->cb) { + clk->out_rate = clk->cb(clk->opaque, rate); + } + + DPRINTF("%s output rate updated to %.1f\n", + object_get_canonical_path(OBJECT(clk)), + clk->out_rate); + + QLIST_FOREACH(child, &clk->bound, node) { + qemu_clk_update_rate(child->clk, clk->out_rate); + } +} + +void qemu_clk_bound_clock(qemu_clk out, qemu_clk in) +{ + ClkList *child; + + child = g_malloc(sizeof(child)); + assert(child); + child->clk = in; + QLIST_INSERT_HEAD(&out->bound, child, node); + qemu_clk_update_rate(in, out->out_rate); +} + +void qemu_clk_unbound(qemu_clk out, qemu_clk in) +{ + ClkList *child, *next; + + QLIST_FOREACH_SAFE(child, &out->bound, node, next) { + if (child->clk == in) { + QLIST_REMOVE(child, node); + g_free(child); + } + } +} + +void qemu_clk_set_callback(qemu_clk clk, + qemu_clk_on_rate_update_cb cb, + void *opaque) +{ + clk->cb = cb; + clk->opaque = opaque; +} + void qemu_clk_attach_to_device(DeviceState *d, qemu_clk clk, const char *name) { assert(name); -- 2.5.5