From patchwork Thu Jan 23 05:25:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 11346773 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 6D3C66C1 for ; Thu, 23 Jan 2020 05:32:31 +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 2842D21835 for ; Thu, 23 Jan 2020 05:32:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="uSCZowX5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2842D21835 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=roeck-us.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:51242 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuV6T-0004Mf-Qz for patchwork-qemu-devel@patchwork.kernel.org; Thu, 23 Jan 2020 00:32:29 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:42275) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuV0H-0004vA-FP for qemu-devel@nongnu.org; Thu, 23 Jan 2020 00:26:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iuV0F-0001rL-KN for qemu-devel@nongnu.org; Thu, 23 Jan 2020 00:26:05 -0500 Received: from mail-pj1-x1042.google.com ([2607:f8b0:4864:20::1042]:35344) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iuV0A-0001ol-0y; Thu, 23 Jan 2020 00:25:58 -0500 Received: by mail-pj1-x1042.google.com with SMTP id s7so710915pjc.0; Wed, 22 Jan 2020 21:25:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=rQNYGv9KlroXur59rvYeczF8ZGHTU/mUuy+9ut/zKbk=; b=uSCZowX5WeHuHl7OmFbvRgJyAP6vz95DZL9Cj3OH5WU0dcKs8YMJdL3tnh//PLDrGz T6AlI9nrFLLbsSEJARrlrS1p7z0JDOcS5slZK+OoEDUgIwSM1zjV7BpRhzy4Zw9O5p9O //K2drpP4lYoqsLJLHnbfUBLHBsMvePfwixi9QfqvTB3BOz76fK1Xl4VwrkAE3HzKzD2 UsUpcw91/o8kjKrm9/VxEp36BWr2PMDkypC2jsWPaKpw5IERQ+LXPExyAHnBrv47ZbWE G4DYkzdDHW5Fy7vYYOqRNf52V41Kulufsv1t0juOEOdWy1MH9uNbmuBVPMMm2dBASPx8 dVyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references; bh=rQNYGv9KlroXur59rvYeczF8ZGHTU/mUuy+9ut/zKbk=; b=GKQrOMrLqG/WGMeYsmjIVdspJHNeUVD5zSug+PuBRbzCSAYrL0+hBrmjaSseAS8nRX 7Jgk1Wx439oj5q0dKz/NpkRi+rKoiUv6+GzRQHiA+OpLevLMzraDyBhxP6zazNt3er3e 9i1JN+I/zfeLAkiXLN6o7C71U8NAcSIQVf3FRGqu8ReKDh3OPXIQFGgBify2xl0A844e nYOlpW/ydkCByRKgCzod5Ak6vuzjzuclQD2UfhHLB/qZdugFvwS4JnP+T/Vr60WX59qY Qpso9x3ofxvvV9lN44AG49nn0+UngX1UKlLQrYeM4vChk1yr6ATf9rFBcZg1QEOW2Yof bv+w== X-Gm-Message-State: APjAAAVLvdb20syEqA2HkVyg6z1DSO0ODJMQQdFPy1R8vyUxyH7oNd40 r8PQ4tjDkkf0703gzczC6K8= X-Google-Smtp-Source: APXvYqxNsA0texJAdGQbzetGuwjslvvgEFm5QITJyzyaVtmuvtGqg3OEie4JpKbTH+VNWPso8gUE+w== X-Received: by 2002:a17:90a:7345:: with SMTP id j5mr2392120pjs.69.1579757156191; Wed, 22 Jan 2020 21:25:56 -0800 (PST) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id d3sm697675pfn.113.2020.01.22.21.25.55 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 22 Jan 2020 21:25:55 -0800 (PST) From: Guenter Roeck To: Peter Maydell Subject: [PATCH v3 6/8] hw/char/exynos4210_uart: Implement Rx FIFO level triggers and timeouts Date: Wed, 22 Jan 2020 21:25:38 -0800 Message-Id: <20200123052540.6132-7-linux@roeck-us.net> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200123052540.6132-1-linux@roeck-us.net> References: <20200123052540.6132-1-linux@roeck-us.net> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::1042 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: Paolo Bonzini , qemu-arm@nongnu.org, qemu-devel@nongnu.org, Guenter Roeck Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" The driver already implements a receive FIFO, but it does not handle receive FIFO trigger levels and timeout. Implement the missing functionality. Signed-off-by: Guenter Roeck --- v3: Dropped VMSTATE_TIMER_PTR Don't call exynos4210_uart_rx_timeout_set() and exynos4210_uart_update_irq() after writes into the UCON register. Chip behavior in this situation is not specified and any handling may be inaccurate, so do nothing. v2: Call exynos4210_uart_rx_timeout_set() from new post_load function to set the receive timeout timer. Add timer to vmstate_exynos4210_uart. hw/char/exynos4210_uart.c | 117 ++++++++++++++++++++++++++++++-------- hw/char/trace-events | 3 +- 2 files changed, 94 insertions(+), 26 deletions(-) diff --git a/hw/char/exynos4210_uart.c b/hw/char/exynos4210_uart.c index 5d48701b6d..8d6b4a071e 100644 --- a/hw/char/exynos4210_uart.c +++ b/hw/char/exynos4210_uart.c @@ -24,6 +24,7 @@ #include "migration/vmstate.h" #include "qemu/error-report.h" #include "qemu/module.h" +#include "qemu/timer.h" #include "chardev/char-fe.h" #include "chardev/char-serial.h" @@ -118,6 +119,7 @@ static const Exynos4210UartReg exynos4210_uart_regs[] = { #define ULCON_STOP_BIT_SHIFT 1 /* UART Tx/Rx Status */ +#define UTRSTAT_Rx_TIMEOUT 0x8 #define UTRSTAT_TRANSMITTER_EMPTY 0x4 #define UTRSTAT_Tx_BUFFER_EMPTY 0x2 #define UTRSTAT_Rx_BUFFER_DATA_READY 0x1 @@ -147,6 +149,9 @@ typedef struct Exynos4210UartState { Exynos4210UartFIFO rx; Exynos4210UartFIFO tx; + QEMUTimer *fifo_timeout_timer; + uint64_t wordtime; /* word time in ns */ + CharBackend chr; qemu_irq irq; @@ -209,15 +214,12 @@ static void fifo_reset(Exynos4210UartFIFO *q) q->rp = 0; } -static uint32_t exynos4210_uart_Tx_FIFO_trigger_level(const Exynos4210UartState *s) +static uint32_t exynos4210_uart_FIFO_trigger_level(uint32_t channel, + uint32_t reg) { - uint32_t level = 0; - uint32_t reg; + uint32_t level; - reg = (s->reg[I_(UFCON)] & UFCON_Tx_FIFO_TRIGGER_LEVEL) >> - UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT; - - switch (s->channel) { + switch (channel) { case 0: level = reg * 32; break; @@ -231,12 +233,34 @@ static uint32_t exynos4210_uart_Tx_FIFO_trigger_level(const Exynos4210UartState break; default: level = 0; - trace_exynos_uart_channel_error(s->channel); + trace_exynos_uart_channel_error(channel); + break; } - return level; } +static uint32_t +exynos4210_uart_Tx_FIFO_trigger_level(const Exynos4210UartState *s) +{ + uint32_t reg; + + reg = (s->reg[I_(UFCON)] & UFCON_Tx_FIFO_TRIGGER_LEVEL) >> + UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT; + + return exynos4210_uart_FIFO_trigger_level(s->channel, reg); +} + +static uint32_t +exynos4210_uart_Rx_FIFO_trigger_level(const Exynos4210UartState *s) +{ + uint32_t reg; + + reg = ((s->reg[I_(UFCON)] & UFCON_Rx_FIFO_TRIGGER_LEVEL) >> + UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT) + 1; + + return exynos4210_uart_FIFO_trigger_level(s->channel, reg); +} + static void exynos4210_uart_update_irq(Exynos4210UartState *s) { /* @@ -244,13 +268,25 @@ static void exynos4210_uart_update_irq(Exynos4210UartState *s) * transmit FIFO is smaller than the trigger level. */ if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) { - uint32_t count = (s->reg[I_(UFSTAT)] & UFSTAT_Tx_FIFO_COUNT) >> UFSTAT_Tx_FIFO_COUNT_SHIFT; if (count <= exynos4210_uart_Tx_FIFO_trigger_level(s)) { s->reg[I_(UINTSP)] |= UINTSP_TXD; } + + /* + * Rx interrupt if trigger level is reached or if rx timeout + * interrupt is disabled and there is data in the receive buffer + */ + count = fifo_elements_number(&s->rx); + if ((count && !(s->reg[I_(UCON)] & 0x80)) || + count >= exynos4210_uart_Rx_FIFO_trigger_level(s)) { + s->reg[I_(UINTSP)] |= UINTSP_RXD; + timer_del(s->fifo_timeout_timer); + } + } else if (s->reg[I_(UTRSTAT)] & UTRSTAT_Rx_BUFFER_DATA_READY) { + s->reg[I_(UINTSP)] |= UINTSP_RXD; } s->reg[I_(UINTP)] = s->reg[I_(UINTSP)] & ~s->reg[I_(UINTM)]; @@ -264,6 +300,21 @@ static void exynos4210_uart_update_irq(Exynos4210UartState *s) } } +static void exynos4210_uart_timeout_int(void *opaque) +{ + Exynos4210UartState *s = opaque; + + trace_exynos_uart_rx_timeout(s->channel, s->reg[I_(UTRSTAT)], + s->reg[I_(UINTSP)]); + + if ((s->reg[I_(UTRSTAT)] & UTRSTAT_Rx_BUFFER_DATA_READY) || + (s->reg[I_(UCON)] & (1 << 11))) { + s->reg[I_(UINTSP)] |= UINTSP_RXD; + s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_TIMEOUT; + exynos4210_uart_update_irq(s); + } +} + static void exynos4210_uart_update_parameters(Exynos4210UartState *s) { int speed, parity, data_bits, stop_bits; @@ -302,10 +353,24 @@ static void exynos4210_uart_update_parameters(Exynos4210UartState *s) ssp.data_bits = data_bits; ssp.stop_bits = stop_bits; + s->wordtime = NANOSECONDS_PER_SECOND * (data_bits + stop_bits + 1) / speed; + qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp); trace_exynos_uart_update_params( - s->channel, speed, parity, data_bits, stop_bits); + s->channel, speed, parity, data_bits, stop_bits, s->wordtime); +} + +static void exynos4210_uart_rx_timeout_set(Exynos4210UartState *s) +{ + if (s->reg[I_(UCON)] & 0x80) { + uint32_t timeout = ((s->reg[I_(UCON)] >> 12) & 0x0f) * s->wordtime; + + timer_mod(s->fifo_timeout_timer, + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout); + } else { + timer_del(s->fifo_timeout_timer); + } } static void exynos4210_uart_write(void *opaque, hwaddr offset, @@ -361,6 +426,10 @@ static void exynos4210_uart_write(void *opaque, hwaddr offset, exynos4210_uart_update_irq(s); break; case UTRSTAT: + if (val & UTRSTAT_Rx_TIMEOUT) { + s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_TIMEOUT; + } + break; case UERSTAT: case UFSTAT: case UMSTAT: @@ -382,6 +451,7 @@ static void exynos4210_uart_write(void *opaque, hwaddr offset, break; } } + static uint64_t exynos4210_uart_read(void *opaque, hwaddr offset, unsigned size) { @@ -461,7 +531,6 @@ static int exynos4210_uart_can_receive(void *opaque) return fifo_empty_elements_number(&s->rx); } - static void exynos4210_uart_receive(void *opaque, const uint8_t *buf, int size) { Exynos4210UartState *s = (Exynos4210UartState *)opaque; @@ -469,24 +538,17 @@ static void exynos4210_uart_receive(void *opaque, const uint8_t *buf, int size) if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) { if (fifo_empty_elements_number(&s->rx) < size) { - for (i = 0; i < fifo_empty_elements_number(&s->rx); i++) { - fifo_store(&s->rx, buf[i]); - } + size = fifo_empty_elements_number(&s->rx); s->reg[I_(UINTSP)] |= UINTSP_ERROR; - s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY; - } else { - for (i = 0; i < size; i++) { - fifo_store(&s->rx, buf[i]); - } - s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY; } - /* XXX: Around here we maybe should check Rx trigger level */ - s->reg[I_(UINTSP)] |= UINTSP_RXD; + for (i = 0; i < size; i++) { + fifo_store(&s->rx, buf[i]); + } + exynos4210_uart_rx_timeout_set(s); } else { s->reg[I_(URXH)] = buf[0]; - s->reg[I_(UINTSP)] |= UINTSP_RXD; - s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY; } + s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY; exynos4210_uart_update_irq(s); } @@ -527,6 +589,7 @@ static int exynos4210_uart_post_load(void *opaque, int version_id) Exynos4210UartState *s = (Exynos4210UartState *)opaque; exynos4210_uart_update_parameters(s); + exynos4210_uart_rx_timeout_set(s); return 0; } @@ -588,6 +651,10 @@ static void exynos4210_uart_init(Object *obj) SysBusDevice *dev = SYS_BUS_DEVICE(obj); Exynos4210UartState *s = EXYNOS4210_UART(dev); + s->fifo_timeout_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, + exynos4210_uart_timeout_int, s); + s->wordtime = NANOSECONDS_PER_SECOND * 10 / 9600; + /* memory mapping */ memory_region_init_io(&s->iomem, obj, &exynos4210_uart_ops, s, "exynos4210.uart", EXYNOS4210_UART_REGS_MEM_SIZE); diff --git a/hw/char/trace-events b/hw/char/trace-events index ba28b45b53..cb73fee6a9 100644 --- a/hw/char/trace-events +++ b/hw/char/trace-events @@ -81,7 +81,7 @@ nrf51_uart_write(uint64_t addr, uint64_t value, unsigned int size) "addr 0x%" PR # exynos4210_uart.c exynos_uart_irq_raised(uint32_t channel, uint32_t reg) "UART%d: IRQ raised: 0x%08"PRIx32 exynos_uart_irq_lowered(uint32_t channel) "UART%d: IRQ lowered" -exynos_uart_update_params(uint32_t channel, int speed, uint8_t parity, int data, int stop) "UART%d: speed: %d, parity: %c, data bits: %d, stop bits: %d" +exynos_uart_update_params(uint32_t channel, int speed, uint8_t parity, int data, int stop, uint64_t wordtime) "UART%d: speed: %d, parity: %c, data bits: %d, stop bits: %d wordtime: %"PRId64"ns" exynos_uart_write(uint32_t channel, uint32_t offset, const char *name, uint64_t val) "UART%d: <0x%04x> %s <- 0x%" PRIx64 exynos_uart_read(uint32_t channel, uint32_t offset, const char *name, uint64_t val) "UART%d: <0x%04x> %s -> 0x%" PRIx64 exynos_uart_rx_fifo_reset(uint32_t channel) "UART%d: Rx FIFO Reset" @@ -94,3 +94,4 @@ exynos_uart_rx_error(uint32_t channel) "UART%d: Rx error" exynos_uart_wo_read(uint32_t channel, const char *name, uint32_t reg) "UART%d: Trying to read from WO register: %s [0x%04"PRIx32"]" exynos_uart_rxsize(uint32_t channel, uint32_t size) "UART%d: Rx FIFO size: %d" exynos_uart_channel_error(uint32_t channel) "Wrong UART channel number: %d" +exynos_uart_rx_timeout(uint32_t channel, uint32_t stat, uint32_t intsp) "UART%d: Rx timeout stat=0x%x intsp=0x%x"