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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
571 lines
15 KiB
C
571 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2012 - 2014 Allwinner Tech
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* Pan Nan <pannan@allwinnertech.com>
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*
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* Copyright (C) 2014 Maxime Ripard
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/reset.h>
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#include <linux/spi/spi.h>
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#define SUN6I_FIFO_DEPTH 128
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#define SUN8I_FIFO_DEPTH 64
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#define SUN6I_GBL_CTL_REG 0x04
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#define SUN6I_GBL_CTL_BUS_ENABLE BIT(0)
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#define SUN6I_GBL_CTL_MASTER BIT(1)
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#define SUN6I_GBL_CTL_TP BIT(7)
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#define SUN6I_GBL_CTL_RST BIT(31)
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#define SUN6I_TFR_CTL_REG 0x08
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#define SUN6I_TFR_CTL_CPHA BIT(0)
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#define SUN6I_TFR_CTL_CPOL BIT(1)
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#define SUN6I_TFR_CTL_SPOL BIT(2)
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#define SUN6I_TFR_CTL_CS_MASK 0x30
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#define SUN6I_TFR_CTL_CS(cs) (((cs) << 4) & SUN6I_TFR_CTL_CS_MASK)
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#define SUN6I_TFR_CTL_CS_MANUAL BIT(6)
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#define SUN6I_TFR_CTL_CS_LEVEL BIT(7)
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#define SUN6I_TFR_CTL_DHB BIT(8)
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#define SUN6I_TFR_CTL_FBS BIT(12)
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#define SUN6I_TFR_CTL_XCH BIT(31)
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#define SUN6I_INT_CTL_REG 0x10
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#define SUN6I_INT_CTL_RF_RDY BIT(0)
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#define SUN6I_INT_CTL_TF_ERQ BIT(4)
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#define SUN6I_INT_CTL_RF_OVF BIT(8)
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#define SUN6I_INT_CTL_TC BIT(12)
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#define SUN6I_INT_STA_REG 0x14
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#define SUN6I_FIFO_CTL_REG 0x18
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#define SUN6I_FIFO_CTL_RF_RDY_TRIG_LEVEL_MASK 0xff
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#define SUN6I_FIFO_CTL_RF_RDY_TRIG_LEVEL_BITS 0
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#define SUN6I_FIFO_CTL_RF_RST BIT(15)
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#define SUN6I_FIFO_CTL_TF_ERQ_TRIG_LEVEL_MASK 0xff
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#define SUN6I_FIFO_CTL_TF_ERQ_TRIG_LEVEL_BITS 16
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#define SUN6I_FIFO_CTL_TF_RST BIT(31)
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#define SUN6I_FIFO_STA_REG 0x1c
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#define SUN6I_FIFO_STA_RF_CNT_MASK 0x7f
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#define SUN6I_FIFO_STA_RF_CNT_BITS 0
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#define SUN6I_FIFO_STA_TF_CNT_MASK 0x7f
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#define SUN6I_FIFO_STA_TF_CNT_BITS 16
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#define SUN6I_CLK_CTL_REG 0x24
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#define SUN6I_CLK_CTL_CDR2_MASK 0xff
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#define SUN6I_CLK_CTL_CDR2(div) (((div) & SUN6I_CLK_CTL_CDR2_MASK) << 0)
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#define SUN6I_CLK_CTL_CDR1_MASK 0xf
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#define SUN6I_CLK_CTL_CDR1(div) (((div) & SUN6I_CLK_CTL_CDR1_MASK) << 8)
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#define SUN6I_CLK_CTL_DRS BIT(12)
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#define SUN6I_MAX_XFER_SIZE 0xffffff
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#define SUN6I_BURST_CNT_REG 0x30
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#define SUN6I_BURST_CNT(cnt) ((cnt) & SUN6I_MAX_XFER_SIZE)
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#define SUN6I_XMIT_CNT_REG 0x34
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#define SUN6I_XMIT_CNT(cnt) ((cnt) & SUN6I_MAX_XFER_SIZE)
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#define SUN6I_BURST_CTL_CNT_REG 0x38
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#define SUN6I_BURST_CTL_CNT_STC(cnt) ((cnt) & SUN6I_MAX_XFER_SIZE)
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#define SUN6I_TXDATA_REG 0x200
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#define SUN6I_RXDATA_REG 0x300
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struct sun6i_spi {
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struct spi_master *master;
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void __iomem *base_addr;
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struct clk *hclk;
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struct clk *mclk;
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struct reset_control *rstc;
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struct completion done;
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const u8 *tx_buf;
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u8 *rx_buf;
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int len;
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unsigned long fifo_depth;
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};
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static inline u32 sun6i_spi_read(struct sun6i_spi *sspi, u32 reg)
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{
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return readl(sspi->base_addr + reg);
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}
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static inline void sun6i_spi_write(struct sun6i_spi *sspi, u32 reg, u32 value)
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{
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writel(value, sspi->base_addr + reg);
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}
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static inline u32 sun6i_spi_get_tx_fifo_count(struct sun6i_spi *sspi)
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{
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u32 reg = sun6i_spi_read(sspi, SUN6I_FIFO_STA_REG);
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reg >>= SUN6I_FIFO_STA_TF_CNT_BITS;
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return reg & SUN6I_FIFO_STA_TF_CNT_MASK;
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}
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static inline void sun6i_spi_enable_interrupt(struct sun6i_spi *sspi, u32 mask)
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{
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u32 reg = sun6i_spi_read(sspi, SUN6I_INT_CTL_REG);
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reg |= mask;
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sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, reg);
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}
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static inline void sun6i_spi_disable_interrupt(struct sun6i_spi *sspi, u32 mask)
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{
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u32 reg = sun6i_spi_read(sspi, SUN6I_INT_CTL_REG);
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reg &= ~mask;
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sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, reg);
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}
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static inline void sun6i_spi_drain_fifo(struct sun6i_spi *sspi, int len)
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{
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u32 reg, cnt;
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u8 byte;
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/* See how much data is available */
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reg = sun6i_spi_read(sspi, SUN6I_FIFO_STA_REG);
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reg &= SUN6I_FIFO_STA_RF_CNT_MASK;
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cnt = reg >> SUN6I_FIFO_STA_RF_CNT_BITS;
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if (len > cnt)
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len = cnt;
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while (len--) {
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byte = readb(sspi->base_addr + SUN6I_RXDATA_REG);
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if (sspi->rx_buf)
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*sspi->rx_buf++ = byte;
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}
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}
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static inline void sun6i_spi_fill_fifo(struct sun6i_spi *sspi, int len)
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{
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u32 cnt;
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u8 byte;
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/* See how much data we can fit */
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cnt = sspi->fifo_depth - sun6i_spi_get_tx_fifo_count(sspi);
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len = min3(len, (int)cnt, sspi->len);
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while (len--) {
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byte = sspi->tx_buf ? *sspi->tx_buf++ : 0;
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writeb(byte, sspi->base_addr + SUN6I_TXDATA_REG);
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sspi->len--;
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}
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}
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static void sun6i_spi_set_cs(struct spi_device *spi, bool enable)
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{
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struct sun6i_spi *sspi = spi_master_get_devdata(spi->master);
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u32 reg;
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reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG);
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reg &= ~SUN6I_TFR_CTL_CS_MASK;
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reg |= SUN6I_TFR_CTL_CS(spi->chip_select);
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if (enable)
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reg |= SUN6I_TFR_CTL_CS_LEVEL;
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else
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reg &= ~SUN6I_TFR_CTL_CS_LEVEL;
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sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg);
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}
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static size_t sun6i_spi_max_transfer_size(struct spi_device *spi)
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{
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return SUN6I_MAX_XFER_SIZE - 1;
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}
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static int sun6i_spi_transfer_one(struct spi_master *master,
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struct spi_device *spi,
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struct spi_transfer *tfr)
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{
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struct sun6i_spi *sspi = spi_master_get_devdata(master);
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unsigned int mclk_rate, div, timeout;
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unsigned int start, end, tx_time;
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unsigned int trig_level;
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unsigned int tx_len = 0;
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int ret = 0;
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u32 reg;
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if (tfr->len > SUN6I_MAX_XFER_SIZE)
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return -EINVAL;
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reinit_completion(&sspi->done);
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sspi->tx_buf = tfr->tx_buf;
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sspi->rx_buf = tfr->rx_buf;
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sspi->len = tfr->len;
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/* Clear pending interrupts */
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sun6i_spi_write(sspi, SUN6I_INT_STA_REG, ~0);
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/* Reset FIFO */
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sun6i_spi_write(sspi, SUN6I_FIFO_CTL_REG,
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SUN6I_FIFO_CTL_RF_RST | SUN6I_FIFO_CTL_TF_RST);
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/*
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* Setup FIFO interrupt trigger level
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* Here we choose 3/4 of the full fifo depth, as it's the hardcoded
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* value used in old generation of Allwinner SPI controller.
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* (See spi-sun4i.c)
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*/
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trig_level = sspi->fifo_depth / 4 * 3;
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sun6i_spi_write(sspi, SUN6I_FIFO_CTL_REG,
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(trig_level << SUN6I_FIFO_CTL_RF_RDY_TRIG_LEVEL_BITS) |
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(trig_level << SUN6I_FIFO_CTL_TF_ERQ_TRIG_LEVEL_BITS));
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/*
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* Setup the transfer control register: Chip Select,
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* polarities, etc.
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*/
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reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG);
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if (spi->mode & SPI_CPOL)
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reg |= SUN6I_TFR_CTL_CPOL;
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else
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reg &= ~SUN6I_TFR_CTL_CPOL;
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if (spi->mode & SPI_CPHA)
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reg |= SUN6I_TFR_CTL_CPHA;
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else
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reg &= ~SUN6I_TFR_CTL_CPHA;
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if (spi->mode & SPI_LSB_FIRST)
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reg |= SUN6I_TFR_CTL_FBS;
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else
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reg &= ~SUN6I_TFR_CTL_FBS;
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/*
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* If it's a TX only transfer, we don't want to fill the RX
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* FIFO with bogus data
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*/
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if (sspi->rx_buf)
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reg &= ~SUN6I_TFR_CTL_DHB;
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else
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reg |= SUN6I_TFR_CTL_DHB;
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/* We want to control the chip select manually */
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reg |= SUN6I_TFR_CTL_CS_MANUAL;
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sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg);
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/* Ensure that we have a parent clock fast enough */
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mclk_rate = clk_get_rate(sspi->mclk);
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if (mclk_rate < (2 * tfr->speed_hz)) {
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clk_set_rate(sspi->mclk, 2 * tfr->speed_hz);
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mclk_rate = clk_get_rate(sspi->mclk);
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}
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/*
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* Setup clock divider.
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*
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* We have two choices there. Either we can use the clock
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* divide rate 1, which is calculated thanks to this formula:
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* SPI_CLK = MOD_CLK / (2 ^ cdr)
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* Or we can use CDR2, which is calculated with the formula:
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* SPI_CLK = MOD_CLK / (2 * (cdr + 1))
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* Wether we use the former or the latter is set through the
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* DRS bit.
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*
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* First try CDR2, and if we can't reach the expected
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* frequency, fall back to CDR1.
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*/
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div = mclk_rate / (2 * tfr->speed_hz);
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if (div <= (SUN6I_CLK_CTL_CDR2_MASK + 1)) {
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if (div > 0)
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div--;
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reg = SUN6I_CLK_CTL_CDR2(div) | SUN6I_CLK_CTL_DRS;
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} else {
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div = ilog2(mclk_rate) - ilog2(tfr->speed_hz);
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reg = SUN6I_CLK_CTL_CDR1(div);
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}
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sun6i_spi_write(sspi, SUN6I_CLK_CTL_REG, reg);
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/* Setup the transfer now... */
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if (sspi->tx_buf)
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tx_len = tfr->len;
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/* Setup the counters */
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sun6i_spi_write(sspi, SUN6I_BURST_CNT_REG, SUN6I_BURST_CNT(tfr->len));
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sun6i_spi_write(sspi, SUN6I_XMIT_CNT_REG, SUN6I_XMIT_CNT(tx_len));
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sun6i_spi_write(sspi, SUN6I_BURST_CTL_CNT_REG,
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SUN6I_BURST_CTL_CNT_STC(tx_len));
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/* Fill the TX FIFO */
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sun6i_spi_fill_fifo(sspi, sspi->fifo_depth);
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/* Enable the interrupts */
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sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, SUN6I_INT_CTL_TC);
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sun6i_spi_enable_interrupt(sspi, SUN6I_INT_CTL_TC |
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SUN6I_INT_CTL_RF_RDY);
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if (tx_len > sspi->fifo_depth)
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sun6i_spi_enable_interrupt(sspi, SUN6I_INT_CTL_TF_ERQ);
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/* Start the transfer */
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reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG);
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sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg | SUN6I_TFR_CTL_XCH);
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tx_time = max(tfr->len * 8 * 2 / (tfr->speed_hz / 1000), 100U);
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start = jiffies;
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timeout = wait_for_completion_timeout(&sspi->done,
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msecs_to_jiffies(tx_time));
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end = jiffies;
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if (!timeout) {
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dev_warn(&master->dev,
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"%s: timeout transferring %u bytes@%iHz for %i(%i)ms",
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dev_name(&spi->dev), tfr->len, tfr->speed_hz,
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jiffies_to_msecs(end - start), tx_time);
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ret = -ETIMEDOUT;
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goto out;
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}
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out:
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sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, 0);
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return ret;
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}
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static irqreturn_t sun6i_spi_handler(int irq, void *dev_id)
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{
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struct sun6i_spi *sspi = dev_id;
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u32 status = sun6i_spi_read(sspi, SUN6I_INT_STA_REG);
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/* Transfer complete */
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if (status & SUN6I_INT_CTL_TC) {
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sun6i_spi_write(sspi, SUN6I_INT_STA_REG, SUN6I_INT_CTL_TC);
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sun6i_spi_drain_fifo(sspi, sspi->fifo_depth);
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complete(&sspi->done);
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return IRQ_HANDLED;
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}
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/* Receive FIFO 3/4 full */
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if (status & SUN6I_INT_CTL_RF_RDY) {
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sun6i_spi_drain_fifo(sspi, SUN6I_FIFO_DEPTH);
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/* Only clear the interrupt _after_ draining the FIFO */
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sun6i_spi_write(sspi, SUN6I_INT_STA_REG, SUN6I_INT_CTL_RF_RDY);
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return IRQ_HANDLED;
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}
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/* Transmit FIFO 3/4 empty */
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if (status & SUN6I_INT_CTL_TF_ERQ) {
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sun6i_spi_fill_fifo(sspi, SUN6I_FIFO_DEPTH);
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if (!sspi->len)
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/* nothing left to transmit */
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sun6i_spi_disable_interrupt(sspi, SUN6I_INT_CTL_TF_ERQ);
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/* Only clear the interrupt _after_ re-seeding the FIFO */
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sun6i_spi_write(sspi, SUN6I_INT_STA_REG, SUN6I_INT_CTL_TF_ERQ);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int sun6i_spi_runtime_resume(struct device *dev)
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{
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struct spi_master *master = dev_get_drvdata(dev);
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struct sun6i_spi *sspi = spi_master_get_devdata(master);
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int ret;
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ret = clk_prepare_enable(sspi->hclk);
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if (ret) {
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dev_err(dev, "Couldn't enable AHB clock\n");
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goto out;
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}
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ret = clk_prepare_enable(sspi->mclk);
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if (ret) {
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dev_err(dev, "Couldn't enable module clock\n");
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goto err;
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}
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ret = reset_control_deassert(sspi->rstc);
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if (ret) {
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dev_err(dev, "Couldn't deassert the device from reset\n");
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goto err2;
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}
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sun6i_spi_write(sspi, SUN6I_GBL_CTL_REG,
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SUN6I_GBL_CTL_BUS_ENABLE | SUN6I_GBL_CTL_MASTER | SUN6I_GBL_CTL_TP);
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return 0;
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err2:
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clk_disable_unprepare(sspi->mclk);
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err:
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clk_disable_unprepare(sspi->hclk);
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out:
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return ret;
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}
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static int sun6i_spi_runtime_suspend(struct device *dev)
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{
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struct spi_master *master = dev_get_drvdata(dev);
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struct sun6i_spi *sspi = spi_master_get_devdata(master);
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reset_control_assert(sspi->rstc);
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clk_disable_unprepare(sspi->mclk);
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clk_disable_unprepare(sspi->hclk);
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return 0;
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}
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static int sun6i_spi_probe(struct platform_device *pdev)
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{
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struct spi_master *master;
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struct sun6i_spi *sspi;
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struct resource *res;
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int ret = 0, irq;
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master = spi_alloc_master(&pdev->dev, sizeof(struct sun6i_spi));
|
|
if (!master) {
|
|
dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, master);
|
|
sspi = spi_master_get_devdata(master);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
sspi->base_addr = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(sspi->base_addr)) {
|
|
ret = PTR_ERR(sspi->base_addr);
|
|
goto err_free_master;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(&pdev->dev, "No spi IRQ specified\n");
|
|
ret = -ENXIO;
|
|
goto err_free_master;
|
|
}
|
|
|
|
ret = devm_request_irq(&pdev->dev, irq, sun6i_spi_handler,
|
|
0, "sun6i-spi", sspi);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Cannot request IRQ\n");
|
|
goto err_free_master;
|
|
}
|
|
|
|
sspi->master = master;
|
|
sspi->fifo_depth = (unsigned long)of_device_get_match_data(&pdev->dev);
|
|
|
|
master->max_speed_hz = 100 * 1000 * 1000;
|
|
master->min_speed_hz = 3 * 1000;
|
|
master->set_cs = sun6i_spi_set_cs;
|
|
master->transfer_one = sun6i_spi_transfer_one;
|
|
master->num_chipselect = 4;
|
|
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
|
|
master->bits_per_word_mask = SPI_BPW_MASK(8);
|
|
master->dev.of_node = pdev->dev.of_node;
|
|
master->auto_runtime_pm = true;
|
|
master->max_transfer_size = sun6i_spi_max_transfer_size;
|
|
|
|
sspi->hclk = devm_clk_get(&pdev->dev, "ahb");
|
|
if (IS_ERR(sspi->hclk)) {
|
|
dev_err(&pdev->dev, "Unable to acquire AHB clock\n");
|
|
ret = PTR_ERR(sspi->hclk);
|
|
goto err_free_master;
|
|
}
|
|
|
|
sspi->mclk = devm_clk_get(&pdev->dev, "mod");
|
|
if (IS_ERR(sspi->mclk)) {
|
|
dev_err(&pdev->dev, "Unable to acquire module clock\n");
|
|
ret = PTR_ERR(sspi->mclk);
|
|
goto err_free_master;
|
|
}
|
|
|
|
init_completion(&sspi->done);
|
|
|
|
sspi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
|
|
if (IS_ERR(sspi->rstc)) {
|
|
dev_err(&pdev->dev, "Couldn't get reset controller\n");
|
|
ret = PTR_ERR(sspi->rstc);
|
|
goto err_free_master;
|
|
}
|
|
|
|
/*
|
|
* This wake-up/shutdown pattern is to be able to have the
|
|
* device woken up, even if runtime_pm is disabled
|
|
*/
|
|
ret = sun6i_spi_runtime_resume(&pdev->dev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Couldn't resume the device\n");
|
|
goto err_free_master;
|
|
}
|
|
|
|
pm_runtime_set_active(&pdev->dev);
|
|
pm_runtime_enable(&pdev->dev);
|
|
pm_runtime_idle(&pdev->dev);
|
|
|
|
ret = devm_spi_register_master(&pdev->dev, master);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "cannot register SPI master\n");
|
|
goto err_pm_disable;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_pm_disable:
|
|
pm_runtime_disable(&pdev->dev);
|
|
sun6i_spi_runtime_suspend(&pdev->dev);
|
|
err_free_master:
|
|
spi_master_put(master);
|
|
return ret;
|
|
}
|
|
|
|
static int sun6i_spi_remove(struct platform_device *pdev)
|
|
{
|
|
pm_runtime_force_suspend(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sun6i_spi_match[] = {
|
|
{ .compatible = "allwinner,sun6i-a31-spi", .data = (void *)SUN6I_FIFO_DEPTH },
|
|
{ .compatible = "allwinner,sun8i-h3-spi", .data = (void *)SUN8I_FIFO_DEPTH },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sun6i_spi_match);
|
|
|
|
static const struct dev_pm_ops sun6i_spi_pm_ops = {
|
|
.runtime_resume = sun6i_spi_runtime_resume,
|
|
.runtime_suspend = sun6i_spi_runtime_suspend,
|
|
};
|
|
|
|
static struct platform_driver sun6i_spi_driver = {
|
|
.probe = sun6i_spi_probe,
|
|
.remove = sun6i_spi_remove,
|
|
.driver = {
|
|
.name = "sun6i-spi",
|
|
.of_match_table = sun6i_spi_match,
|
|
.pm = &sun6i_spi_pm_ops,
|
|
},
|
|
};
|
|
module_platform_driver(sun6i_spi_driver);
|
|
|
|
MODULE_AUTHOR("Pan Nan <pannan@allwinnertech.com>");
|
|
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
|
|
MODULE_DESCRIPTION("Allwinner A31 SPI controller driver");
|
|
MODULE_LICENSE("GPL");
|