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[90.63.244.31]) by smtp.gmail.com with ESMTPSA id m21sm12242885wmi.27.2020.03.12.06.31.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Mar 2020 06:31:40 -0700 (PDT) From: Neil Armstrong To: broonie@kernel.org Subject: [PATCH 7/9] spi: meson-spicc: adapt burst handling for G12A support Date: Thu, 12 Mar 2020 14:31:29 +0100 Message-Id: <20200312133131.26430-8-narmstrong@baylibre.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20200312133131.26430-1-narmstrong@baylibre.com> References: <20200312133131.26430-1-narmstrong@baylibre.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200312_063143_211326_6DC45473 X-CRM114-Status: GOOD ( 17.56 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:343 listed in] [list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-amlogic@lists.infradead.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Neil Armstrong Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The G12A SPICC controller variant has a different FIFO size and doesn't handle the RX Half interrupt the same way as GXL & AXG variants. Thus simplify the burst management and take in account a variable FIFO size. Signed-off-by: Neil Armstrong --- drivers/spi/spi-meson-spicc.c | 129 +++++++++++++--------------------- 1 file changed, 50 insertions(+), 79 deletions(-) diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c index 4494a791f4a7..351ccd8dd2c2 100644 --- a/drivers/spi/spi-meson-spicc.c +++ b/drivers/spi/spi-meson-spicc.c @@ -141,12 +141,10 @@ #define writel_bits_relaxed(mask, val, addr) \ writel_relaxed((readl_relaxed(addr) & ~(mask)) | (val), addr) -#define SPICC_BURST_MAX 16 -#define SPICC_FIFO_HALF 10 - struct meson_spicc_data { unsigned int max_speed_hz; unsigned int min_speed_hz; + unsigned int fifo_size; bool has_oen; bool has_enhance_clk_div; }; @@ -166,8 +164,6 @@ struct meson_spicc_device { unsigned long tx_remain; unsigned long rx_remain; unsigned long xfer_remain; - bool is_burst_end; - bool is_last_burst; }; static void meson_spicc_oen_enable(struct meson_spicc_device *spicc) @@ -191,7 +187,7 @@ static inline bool meson_spicc_txfull(struct meson_spicc_device *spicc) static inline bool meson_spicc_rxready(struct meson_spicc_device *spicc) { - return FIELD_GET(SPICC_RH | SPICC_RR | SPICC_RF_EN, + return FIELD_GET(SPICC_RH | SPICC_RR | SPICC_RF, readl_relaxed(spicc->base + SPICC_STATREG)); } @@ -246,34 +242,22 @@ static inline void meson_spicc_tx(struct meson_spicc_device *spicc) spicc->base + SPICC_TXDATA); } -static inline u32 meson_spicc_setup_rx_irq(struct meson_spicc_device *spicc, - u32 irq_ctrl) +static inline void meson_spicc_setup_burst(struct meson_spicc_device *spicc) { - if (spicc->rx_remain > SPICC_FIFO_HALF) - irq_ctrl |= SPICC_RH_EN; - else - irq_ctrl |= SPICC_RR_EN; - - return irq_ctrl; -} -static inline void meson_spicc_setup_burst(struct meson_spicc_device *spicc, - unsigned int burst_len) -{ + unsigned int burst_len = min_t(unsigned int, + spicc->xfer_remain / + spicc->bytes_per_word, + spicc->data->fifo_size); /* Setup Xfer variables */ spicc->tx_remain = burst_len; spicc->rx_remain = burst_len; spicc->xfer_remain -= burst_len * spicc->bytes_per_word; - spicc->is_burst_end = false; - if (burst_len < SPICC_BURST_MAX || !spicc->xfer_remain) - spicc->is_last_burst = true; - else - spicc->is_last_burst = false; /* Setup burst length */ writel_bits_relaxed(SPICC_BURSTLENGTH_MASK, FIELD_PREP(SPICC_BURSTLENGTH_MASK, - burst_len), + burst_len - 1), spicc->base + SPICC_CONREG); /* Fill TX FIFO */ @@ -283,61 +267,26 @@ static inline void meson_spicc_setup_burst(struct meson_spicc_device *spicc, static irqreturn_t meson_spicc_irq(int irq, void *data) { struct meson_spicc_device *spicc = (void *) data; - u32 ctrl = readl_relaxed(spicc->base + SPICC_INTREG); - u32 stat = readl_relaxed(spicc->base + SPICC_STATREG) & ctrl; - ctrl &= ~(SPICC_RH_EN | SPICC_RR_EN); + writel_bits_relaxed(SPICC_TC, SPICC_TC, spicc->base + SPICC_STATREG); /* Empty RX FIFO */ meson_spicc_rx(spicc); - /* Enable TC interrupt since we transferred everything */ - if (!spicc->tx_remain && !spicc->rx_remain) { - spicc->is_burst_end = true; - - /* Enable TC interrupt */ - ctrl |= SPICC_TC_EN; - - /* Reload IRQ status */ - stat = readl_relaxed(spicc->base + SPICC_STATREG) & ctrl; - } - - /* Check transfer complete */ - if ((stat & SPICC_TC) && spicc->is_burst_end) { - unsigned int burst_len; - - /* Clear TC bit */ - writel_relaxed(SPICC_TC, spicc->base + SPICC_STATREG); - - /* Disable TC interrupt */ - ctrl &= ~SPICC_TC_EN; - - if (spicc->is_last_burst) { - /* Disable all IRQs */ - writel(0, spicc->base + SPICC_INTREG); - - spi_finalize_current_transfer(spicc->master); + if (!spicc->xfer_remain) { + /* Disable all IRQs */ + writel(0, spicc->base + SPICC_INTREG); - return IRQ_HANDLED; - } + spi_finalize_current_transfer(spicc->master); - burst_len = min_t(unsigned int, - spicc->xfer_remain / spicc->bytes_per_word, - SPICC_BURST_MAX); - - /* Setup burst */ - meson_spicc_setup_burst(spicc, burst_len); - - /* Restart burst */ - writel_bits_relaxed(SPICC_XCH, SPICC_XCH, - spicc->base + SPICC_CONREG); + return IRQ_HANDLED; } - /* Setup RX interrupt trigger */ - ctrl = meson_spicc_setup_rx_irq(spicc, ctrl); + /* Setup burst */ + meson_spicc_setup_burst(spicc); - /* Reconfigure interrupts */ - writel(ctrl, spicc->base + SPICC_INTREG); + /* Start burst */ + writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG); return IRQ_HANDLED; } @@ -405,6 +354,28 @@ static void meson_spicc_setup_xfer(struct meson_spicc_device *spicc, clk_set_rate(spicc->clk, xfer->speed_hz); meson_spicc_auto_io_delay(spicc); + + writel_relaxed(0, spicc->base + SPICC_DMAREG); +} + +static void meson_spicc_reset_fifo(struct meson_spicc_device *spicc) +{ + u32 data; + + if (spicc->data->has_oen) + writel_bits_relaxed(SPICC_ENH_MAIN_CLK_AO, + SPICC_ENH_MAIN_CLK_AO, + spicc->base + SPICC_ENH_CTL0); + + writel_bits_relaxed(SPICC_FIFORST_W1_MASK, SPICC_FIFORST_W1_MASK, + spicc->base + SPICC_TESTREG); + + while (meson_spicc_rxready(spicc)) + data = readl_relaxed(spicc->base + SPICC_RXDATA); + + if (spicc->data->has_oen) + writel_bits_relaxed(SPICC_ENH_MAIN_CLK_AO, 0, + spicc->base + SPICC_ENH_CTL0); } static int meson_spicc_transfer_one(struct spi_master *master, @@ -412,8 +383,6 @@ static int meson_spicc_transfer_one(struct spi_master *master, struct spi_transfer *xfer) { struct meson_spicc_device *spicc = spi_master_get_devdata(master); - unsigned int burst_len; - u32 irq = 0; /* Store current transfer */ spicc->xfer = xfer; @@ -427,22 +396,22 @@ static int meson_spicc_transfer_one(struct spi_master *master, spicc->bytes_per_word = DIV_ROUND_UP(spicc->xfer->bits_per_word, 8); + if (xfer->len % spicc->bytes_per_word) + return -EINVAL; + /* Setup transfer parameters */ meson_spicc_setup_xfer(spicc, xfer); - burst_len = min_t(unsigned int, - spicc->xfer_remain / spicc->bytes_per_word, - SPICC_BURST_MAX); - - meson_spicc_setup_burst(spicc, burst_len); + meson_spicc_reset_fifo(spicc); - irq = meson_spicc_setup_rx_irq(spicc, irq); + /* Setup burst */ + meson_spicc_setup_burst(spicc); /* Start burst */ writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG); /* Enable interrupts */ - writel_relaxed(irq, spicc->base + SPICC_INTREG); + writel_relaxed(SPICC_TC_EN, spicc->base + SPICC_INTREG); return 1; } @@ -499,7 +468,7 @@ static int meson_spicc_prepare_message(struct spi_master *master, /* Setup no wait cycles by default */ writel_relaxed(0, spicc->base + SPICC_PERIODREG); - writel_bits_relaxed(BIT(24), BIT(24), spicc->base + SPICC_TESTREG); + writel_bits_relaxed(SPICC_LBC_W1, 0, spicc->base + SPICC_TESTREG); return 0; } @@ -797,11 +766,13 @@ static int meson_spicc_remove(struct platform_device *pdev) static const struct meson_spicc_data meson_spicc_gx_data = { .max_speed_hz = 30000000, .min_speed_hz = 325000, + .fifo_size = 16, }; static const struct meson_spicc_data meson_spicc_axg_data = { .max_speed_hz = 80000000, .min_speed_hz = 325000, + .fifo_size = 16, .has_oen = true, .has_enhance_clk_div = true, };