From patchwork Mon Oct 5 19:56:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Luc Michel X-Patchwork-Id: 11817557 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 61706139A for ; Mon, 5 Oct 2020 20:26:52 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0C18D2074F for ; Mon, 5 Oct 2020 20:26:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=lmichel.fr header.i=@lmichel.fr header.b="PVf0faXM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0C18D2074F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=lmichel.fr Authentication-Results: mail.kernel.org; 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h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MO0Muj7yuPd6SWwH9hfY/l2s1zABrTHCErTOwR/d+QM=; b=PVf0faXMbJklfb6mQG8L+Ri+8I1NBUCQZLK6fTGCaI9QHhUFDjc6WXjUzy4tumRzANqUBS /jAFyFPGzOABEg9GBdTMPqMq3NyVJYexJzda4ducYoYLY8ReWw5bwGPLrJ4LNzZfySpk7j tRh6lRcZLgkxbezURqK28Nw+4DGfSX4G/eEhDoWg6tM+ajqSn9yfNZkqPtT9hdJRv6IRnS 6KWdo1X7KIMQ3EN5/es7/Xeq4RGpGKTW16I+obyOb/jlkzzW+53xVZ4+SOrqc1+zHc/77s E9sHX+pw4AZzgFkTq3d6GgRX07bHF3VqSjGQW4EZuBqp1qY67vTkVyHAQv3a6A== From: Luc Michel To: qemu-devel@nongnu.org Subject: [PATCH v2 14/15] hw/char/pl011: add a clock input Date: Mon, 5 Oct 2020 21:56:11 +0200 Message-Id: <20201005195612.1999165-15-luc@lmichel.fr> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201005195612.1999165-1-luc@lmichel.fr> References: <20201005195612.1999165-1-luc@lmichel.fr> MIME-Version: 1.0 ARC-Message-Signature: i=1; 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pharaoh.lmichel.fr Received-SPF: pass client-ip=149.202.28.74; envelope-from=luc@lmichel.fr; helo=pharaoh.lmichel.fr X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/05 15:49:50 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Luc Michel , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Andrew Baumann , Paul Zimmerman , Niek Linnenbank , qemu-arm@nongnu.org, Havard Skinnemoen Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Add a clock input to the PL011 UART so we can compute the current baud rate and trace it. This is intended for developers who wish to use QEMU to e.g. debug their firmware or to figure out the baud rate configured by an unknown/closed source binary. Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Luc Michel --- include/hw/char/pl011.h | 1 + hw/char/pl011.c | 45 +++++++++++++++++++++++++++++++++++++++++ hw/char/trace-events | 1 + 3 files changed, 47 insertions(+) diff --git a/include/hw/char/pl011.h b/include/hw/char/pl011.h index a91ea50e11..33e5e5317b 100644 --- a/include/hw/char/pl011.h +++ b/include/hw/char/pl011.h @@ -47,10 +47,11 @@ struct PL011State { int read_pos; int read_count; int read_trigger; CharBackend chr; qemu_irq irq[6]; + Clock *clk; const unsigned char *id; }; static inline DeviceState *pl011_create(hwaddr addr, qemu_irq irq, diff --git a/hw/char/pl011.c b/hw/char/pl011.c index 13e784f9d9..ede16c781c 100644 --- a/hw/char/pl011.c +++ b/hw/char/pl011.c @@ -20,10 +20,11 @@ #include "qemu/osdep.h" #include "hw/char/pl011.h" #include "hw/irq.h" #include "hw/sysbus.h" +#include "hw/qdev-clock.h" #include "migration/vmstate.h" #include "chardev/char-fe.h" #include "qemu/log.h" #include "qemu/module.h" #include "trace.h" @@ -167,10 +168,29 @@ static void pl011_set_read_trigger(PL011State *s) else #endif s->read_trigger = 1; } +static unsigned int pl011_get_baudrate(const PL011State *s) +{ + uint64_t clk; + + if (s->fbrd == 0) { + return 0; + } + + clk = clock_get_hz(s->clk); + return (clk / ((s->ibrd << 6) + s->fbrd)) << 2; +} + +static void pl011_trace_baudrate_change(const PL011State *s) +{ + trace_pl011_baudrate_change(pl011_get_baudrate(s), + clock_get_hz(s->clk), + s->ibrd, s->fbrd); +} + static void pl011_write(void *opaque, hwaddr offset, uint64_t value, unsigned size) { PL011State *s = (PL011State *)opaque; unsigned char ch; @@ -196,13 +216,15 @@ static void pl011_write(void *opaque, hwaddr offset, case 8: /* UARTUARTILPR */ s->ilpr = value; break; case 9: /* UARTIBRD */ s->ibrd = value; + pl011_trace_baudrate_change(s); break; case 10: /* UARTFBRD */ s->fbrd = value; + pl011_trace_baudrate_change(s); break; case 11: /* UARTLCR_H */ /* Reset the FIFO state on FIFO enable or disable */ if ((s->lcr ^ value) & 0x10) { s->read_count = 0; @@ -284,16 +306,33 @@ static void pl011_event(void *opaque, QEMUChrEvent event) { if (event == CHR_EVENT_BREAK) pl011_put_fifo(opaque, 0x400); } +static void pl011_clock_update(void *opaque) +{ + PL011State *s = PL011(opaque); + + pl011_trace_baudrate_change(s); +} + static const MemoryRegionOps pl011_ops = { .read = pl011_read, .write = pl011_write, .endianness = DEVICE_NATIVE_ENDIAN, }; +static const VMStateDescription vmstate_pl011_clock = { + .name = "pl011/clock", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_CLOCK(clk, PL011State), + VMSTATE_END_OF_LIST() + } +}; + static const VMStateDescription vmstate_pl011 = { .name = "pl011", .version_id = 2, .minimum_version_id = 2, .fields = (VMStateField[]) { @@ -312,10 +351,14 @@ static const VMStateDescription vmstate_pl011 = { VMSTATE_UINT32(ifl, PL011State), VMSTATE_INT32(read_pos, PL011State), VMSTATE_INT32(read_count, PL011State), VMSTATE_INT32(read_trigger, PL011State), VMSTATE_END_OF_LIST() + }, + .subsections = (const VMStateDescription * []) { + &vmstate_pl011_clock, + NULL } }; static Property pl011_properties[] = { DEFINE_PROP_CHR("chardev", PL011State, chr), @@ -332,10 +375,12 @@ static void pl011_init(Object *obj) sysbus_init_mmio(sbd, &s->iomem); for (i = 0; i < ARRAY_SIZE(s->irq); i++) { sysbus_init_irq(sbd, &s->irq[i]); } + s->clk = qdev_init_clock_in(DEVICE(obj), "clk", pl011_clock_update, s); + s->read_trigger = 1; s->ifl = 0x12; s->cr = 0x300; s->flags = 0x90; diff --git a/hw/char/trace-events b/hw/char/trace-events index 609df10fed..81026f6612 100644 --- a/hw/char/trace-events +++ b/hw/char/trace-events @@ -63,10 +63,11 @@ pl011_read(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x" pl011_read_fifo(int read_count) "FIFO read, read_count now %d" pl011_write(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x" pl011_can_receive(uint32_t lcr, int read_count, int r) "LCR 0x%08x read_count %d returning %d" pl011_put_fifo(uint32_t c, int read_count) "new char 0x%x read_count now %d" pl011_put_fifo_full(void) "FIFO now full, RXFF set" +pl011_baudrate_change(unsigned int baudrate, uint64_t clock, uint32_t ibrd, uint32_t fbrd) "new baudrate %u (clk: %" PRIu64 "hz, ibrd: %" PRIu32 ", fbrd: %" PRIu32 ")" # cmsdk-apb-uart.c cmsdk_apb_uart_read(uint64_t offset, uint64_t data, unsigned size) "CMSDK APB UART read: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u" cmsdk_apb_uart_write(uint64_t offset, uint64_t data, unsigned size) "CMSDK APB UART write: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u" cmsdk_apb_uart_reset(void) "CMSDK APB UART: reset"