From patchwork Sat Sep 7 21:45:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacob Abrams X-Patchwork-Id: 13795284 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 68338ECE56F for ; Sat, 7 Sep 2024 21:47:07 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sn3G1-0007m9-Ql; Sat, 07 Sep 2024 17:46:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sn3G0-0007le-I9 for qemu-devel@nongnu.org; Sat, 07 Sep 2024 17:46:12 -0400 Received: from mail-pj1-x1036.google.com ([2607:f8b0:4864:20::1036]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sn3Fw-0006am-GQ for qemu-devel@nongnu.org; Sat, 07 Sep 2024 17:46:11 -0400 Received: by mail-pj1-x1036.google.com with SMTP id 98e67ed59e1d1-2d87f34a650so2143864a91.1 for ; Sat, 07 Sep 2024 14:46:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1725745566; x=1726350366; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=tsZ1skBJYv0lTXgXWfwzxn7N+kD9w6DoeE5PWN/73iM=; b=GIvaAinqZQuw2o5POyo80+w28LdUfsW6FOoICWMhmWIvmrUwVc3W0zMbtBY8Hvw3gd Bp5OdRQx4rFN35MC4J6TsyUKrquwHWIpVwkRnoiaAwGPKphCrOD3XqSA+tNRa5Wv+roF I23jfkLDH7+CLeSf5QwKDJE/qvMrEMg+CnP6JDlMlGfUIs/FqmiZALyP3N/UeTuPEtyV sSJgMt7ShaQAxCtk+nkDJiPjXBNZ1nApNHYhuFdE2De1EP/ud9ogyyAK2den3vL8op3r Y7xnc2MNww0WFfilM4gMLVB1xoB9Zl0QKpcgCY3YwJveBqty8Uv5/dWN9lXNHNZbfd26 SXZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725745566; x=1726350366; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=tsZ1skBJYv0lTXgXWfwzxn7N+kD9w6DoeE5PWN/73iM=; b=UHrRr3CcXZ2zK0MSr06wxDdes+niuINrtCJ8rLuXug2Hc4ArC06uynI4oedviJebBs NSjKZcUZmI9cYm7kFmwao5bLPlMvfAGocSs8NF9k48vptg3VFyPocdyE4lN1RMdqe1q8 rdPvtT0t0EGtFwop+fEaPOpTkqrNwqneuEyfa4xNhQKobh4r4lUCDa7q6mlNgBg6nmga 4eEPBkCMcAI9b6tytQs9fyZbnhzL91rmBcT06BEVy4O5Jn3eOUiTJPXWdOOOHTDphF7V JuLCZJET0lexRxCq23ltsum366ycnNCzzcTfSdfqPQN5dFD3Bd8wcnwReJrhUPuWQoBn oLPA== X-Gm-Message-State: AOJu0Yyjjj0AccI3sRZ0t2rK8Bl2aU7UaSCllw8Lxya0wn2EtU6opsv1 cBMjlQ8gytkaKZMSKj5QAsX420kahBFbuRHNNspfIq5cf193rMD24kJ6f/ASA6E= X-Google-Smtp-Source: AGHT+IFUNwN7dzm3tUpyBTwB7N+TIiIC5DsIKFJD0hbJOhlCTG4djjY+r+7kx1zcqEE9Y7nwTF6l8w== X-Received: by 2002:a17:90b:2247:b0:2da:6e46:ad48 with SMTP id 98e67ed59e1d1-2dad4f0e439mr10101471a91.1.1725745566014; Sat, 07 Sep 2024 14:46:06 -0700 (PDT) Received: from jacob-pop23u.lan ([2600:1700:88b2:a50:2c86:7da2:dc34:a97f]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2db04966aa5sm1721116a91.37.2024.09.07.14.46.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 07 Sep 2024 14:46:05 -0700 (PDT) From: Jacob Abrams To: qemu-devel@nongnu.org Cc: philmd@linaro.org, peter.maydell@linaro.org, Jacob Abrams Subject: [PATCH v2] hw/char/stm32l4x5_usart.c: Fix ACK and min access size Date: Sat, 7 Sep 2024 14:45:39 -0700 Message-ID: <20240907214602.96920-1-satur9nine@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::1036; envelope-from=satur9nine@gmail.com; helo=mail-pj1-x1036.google.com 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org These changes allow the official STM32L4xx HAL UART driver to function properly with the b-l475e-iot01a machine. Modifying USART_CR1 TE bit should alter USART_ISR TEACK bit, and likewise for RE and REACK bit. USART registers may be accessed via 16-bit instructions. Reseting USART_CR1 UE bit should restore ISR to default value. Fixes: 87b77e6e01ca ("hw/char/stm32l4x5_usart: Enable serial read and write") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2540 Signed-off-by: Jacob Abrams --- Changes since version 1: - Add qtest_quit to end of new test hw/char/stm32l4x5_usart.c | 29 ++++++++++++++++++--- tests/qtest/stm32l4x5_usart-test.c | 41 +++++++++++++++++++++++++++++- 2 files changed, 66 insertions(+), 4 deletions(-) diff --git a/hw/char/stm32l4x5_usart.c b/hw/char/stm32l4x5_usart.c index fc5dcac0c4..859fc6236a 100644 --- a/hw/char/stm32l4x5_usart.c +++ b/hw/char/stm32l4x5_usart.c @@ -154,6 +154,28 @@ REG32(RDR, 0x24) REG32(TDR, 0x28) FIELD(TDR, TDR, 0, 9) +#define ISR_RESET_VALUE (0x020000C0) + +static void stm32l4x5_update_isr(Stm32l4x5UsartBaseState *s) +{ + if (!(s->cr1 & R_CR1_UE_MASK)) { + s->isr = ISR_RESET_VALUE; + return; + } + + if (s->cr1 & R_CR1_TE_MASK) { + s->isr |= R_ISR_TEACK_MASK; + } else { + s->isr &= ~R_ISR_TEACK_MASK; + } + + if (s->cr1 & R_CR1_RE_MASK) { + s->isr |= R_ISR_REACK_MASK; + } else { + s->isr &= ~R_ISR_REACK_MASK; + } +} + static void stm32l4x5_update_irq(Stm32l4x5UsartBaseState *s) { if (((s->isr & R_ISR_WUF_MASK) && (s->cr3 & R_CR3_WUFIE_MASK)) || @@ -367,7 +389,7 @@ static void stm32l4x5_usart_base_reset_hold(Object *obj, ResetType type) s->brr = 0x00000000; s->gtpr = 0x00000000; s->rtor = 0x00000000; - s->isr = 0x020000C0; + s->isr = ISR_RESET_VALUE; s->rdr = 0x00000000; s->tdr = 0x00000000; @@ -456,6 +478,7 @@ static void stm32l4x5_usart_base_write(void *opaque, hwaddr addr, case A_CR1: s->cr1 = value; stm32l4x5_update_params(s); + stm32l4x5_update_isr(s); stm32l4x5_update_irq(s); return; case A_CR2: @@ -508,12 +531,12 @@ static const MemoryRegionOps stm32l4x5_usart_base_ops = { .endianness = DEVICE_NATIVE_ENDIAN, .valid = { .max_access_size = 4, - .min_access_size = 4, + .min_access_size = 2, .unaligned = false }, .impl = { .max_access_size = 4, - .min_access_size = 4, + .min_access_size = 2, .unaligned = false }, }; diff --git a/tests/qtest/stm32l4x5_usart-test.c b/tests/qtest/stm32l4x5_usart-test.c index c175ff3064..018a8a62bf 100644 --- a/tests/qtest/stm32l4x5_usart-test.c +++ b/tests/qtest/stm32l4x5_usart-test.c @@ -36,6 +36,8 @@ REG32(GTPR, 0x10) REG32(RTOR, 0x14) REG32(RQR, 0x18) REG32(ISR, 0x1C) + FIELD(ISR, REACK, 22, 1) + FIELD(ISR, TEACK, 21, 1) FIELD(ISR, TXE, 7, 1) FIELD(ISR, RXNE, 5, 1) FIELD(ISR, ORE, 3, 1) @@ -191,7 +193,7 @@ static void init_uart(QTestState *qts) /* Enable the transmitter, the receiver and the USART. */ qtest_writel(qts, (USART1_BASE_ADDR + A_CR1), - R_CR1_UE_MASK | R_CR1_RE_MASK | R_CR1_TE_MASK); + cr1 | R_CR1_UE_MASK | R_CR1_RE_MASK | R_CR1_TE_MASK); } static void test_write_read(void) @@ -203,6 +205,11 @@ static void test_write_read(void) const uint32_t tdr = qtest_readl(qts, USART1_BASE_ADDR + A_TDR); g_assert_cmpuint(tdr, ==, 0x000001FF); + /* Official STM HAL uses uint16_t for TDR */ + qtest_writew(qts, USART1_BASE_ADDR + A_TDR, 0xFFFF); + const uint16_t tdr16 = qtest_readw(qts, USART1_BASE_ADDR + A_TDR); + g_assert_cmpuint(tdr16, ==, 0x000001FF); + qtest_quit(qts); } @@ -298,6 +305,37 @@ static void test_send_str(void) qtest_quit(qts); } +static void test_ack(void) +{ + uint32_t cr1; + uint32_t isr; + QTestState *qts = qtest_init("-M b-l475e-iot01a"); + + init_uart(qts); + + cr1 = qtest_readl(qts, (USART1_BASE_ADDR + A_CR1)); + + /* Disable the transmitter and receiver. */ + qtest_writel(qts, (USART1_BASE_ADDR + A_CR1), + cr1 & ~(R_CR1_RE_MASK | R_CR1_TE_MASK)); + + /* Test ISR ACK for transmitter and receiver disabled */ + isr = qtest_readl(qts, (USART1_BASE_ADDR + A_ISR)); + g_assert_false(isr & R_ISR_TEACK_MASK); + g_assert_false(isr & R_ISR_REACK_MASK); + + /* Enable the transmitter and receiver. */ + qtest_writel(qts, (USART1_BASE_ADDR + A_CR1), + cr1 | (R_CR1_RE_MASK | R_CR1_TE_MASK)); + + /* Test ISR ACK for transmitter and receiver disabled */ + isr = qtest_readl(qts, (USART1_BASE_ADDR + A_ISR)); + g_assert_true(isr & R_ISR_TEACK_MASK); + g_assert_true(isr & R_ISR_REACK_MASK); + + qtest_quit(qts); +} + int main(int argc, char **argv) { int ret; @@ -310,6 +348,7 @@ int main(int argc, char **argv) qtest_add_func("stm32l4x5/usart/send_char", test_send_char); qtest_add_func("stm32l4x5/usart/receive_str", test_receive_str); qtest_add_func("stm32l4x5/usart/send_str", test_send_str); + qtest_add_func("stm32l4x5/usart/ack", test_ack); ret = g_test_run(); return ret;