From 1faa437db9b5e9217648f1e8db8a03ef93e5aed1 Mon Sep 17 00:00:00 2001 From: Jacob Abrams Date: Tue, 10 Sep 2024 21:32:55 -0700 Subject: hw/char/stm32l4x5_usart.c: Enable USART ACK bit response SW modifying USART_CR1 TE bit should cuase HW to respond by altering USART_ISR TEACK bit, and likewise for RE and REACK bit. This resolves some but not all issues necessary for the official STM USART HAL driver to function as is. 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 Message-id: 20240911043255.51966-1-satur9nine@gmail.com Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell (cherry picked from commit 6cce0dcc6f7aaaeb7f17577776da510b04f67c99) Signed-off-by: Michael Tokarev --- hw/char/stm32l4x5_usart.c | 16 ++++++++++++++++ tests/qtest/stm32l4x5_usart-test.c | 36 +++++++++++++++++++++++++++++++++++- 2 files changed, 51 insertions(+), 1 deletion(-) diff --git a/hw/char/stm32l4x5_usart.c b/hw/char/stm32l4x5_usart.c index fc5dcac0c4..3cf200c080 100644 --- a/hw/char/stm32l4x5_usart.c +++ b/hw/char/stm32l4x5_usart.c @@ -154,6 +154,21 @@ REG32(RDR, 0x24) REG32(TDR, 0x28) FIELD(TDR, TDR, 0, 9) +static void stm32l4x5_update_isr(Stm32l4x5UsartBaseState *s) +{ + 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)) || @@ -456,6 +471,7 @@ 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: diff --git a/tests/qtest/stm32l4x5_usart-test.c b/tests/qtest/stm32l4x5_usart-test.c index 8902518233..0630f8d53b 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) @@ -296,6 +298,37 @@ 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; @@ -308,6 +341,7 @@ 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; -- cgit v1.2.3