This driver depends on the deleted AT91 architecture and cause
me headaches from a GPIO point of view. It is unused so delete
it.
Cc: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/spi/Kconfig | 7 -
drivers/spi/Makefile | 1 -
drivers/spi/spi-atmel.c | 1843 ---------------------------------------
3 files changed, 1851 deletions(-)
delete mode 100644 drivers/spi/spi-atmel.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 671d078349cc..6624f43268d2 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -76,13 +76,6 @@ config SPI_ARMADA_3700
This enables support for the SPI controller present on the
Marvell Armada 3700 SoCs.
-config SPI_ATMEL
- tristate "Atmel SPI Controller"
- depends on ARCH_AT91 || COMPILE_TEST
- help
- This selects a driver for the Atmel SPI Controller, present on
- many AT91 ARM chips.
-
config SPI_AU1550
tristate "Au1550/Au1200/Au1300 SPI Controller"
depends on MIPS_ALCHEMY
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index a90d55970036..088cc3f5616f 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -15,7 +15,6 @@ obj-$(CONFIG_SPI_LOOPBACK_TEST) += spi-loopback-test.o
# SPI master controller drivers (bus)
obj-$(CONFIG_SPI_ALTERA) += spi-altera.o
obj-$(CONFIG_SPI_ARMADA_3700) += spi-armada-3700.o
-obj-$(CONFIG_SPI_ATMEL) += spi-atmel.o
obj-$(CONFIG_SPI_ATH79) += spi-ath79.o
obj-$(CONFIG_SPI_AU1550) += spi-au1550.o
obj-$(CONFIG_SPI_AXI_SPI_ENGINE) += spi-axi-spi-engine.o
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
deleted file mode 100644
index 3f890d162934..000000000000
--- a/drivers/spi/spi-atmel.c
+++ /dev/null
@@ -1,1843 +0,0 @@
-/*
- * Driver for Atmel AT32 and AT91 SPI Controllers
- *
- * Copyright (C) 2006 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/kernel.h>
-#include <linux/clk.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/delay.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmaengine.h>
-#include <linux/err.h>
-#include <linux/interrupt.h>
-#include <linux/spi/spi.h>
-#include <linux/slab.h>
-#include <linux/platform_data/dma-atmel.h>
-#include <linux/of.h>
-
-#include <linux/io.h>
-#include <linux/gpio.h>
-#include <linux/of_gpio.h>
-#include <linux/pinctrl/consumer.h>
-#include <linux/pm_runtime.h>
-
-/* SPI register offsets */
-#define SPI_CR 0x0000
-#define SPI_MR 0x0004
-#define SPI_RDR 0x0008
-#define SPI_TDR 0x000c
-#define SPI_SR 0x0010
-#define SPI_IER 0x0014
-#define SPI_IDR 0x0018
-#define SPI_IMR 0x001c
-#define SPI_CSR0 0x0030
-#define SPI_CSR1 0x0034
-#define SPI_CSR2 0x0038
-#define SPI_CSR3 0x003c
-#define SPI_FMR 0x0040
-#define SPI_FLR 0x0044
-#define SPI_VERSION 0x00fc
-#define SPI_RPR 0x0100
-#define SPI_RCR 0x0104
-#define SPI_TPR 0x0108
-#define SPI_TCR 0x010c
-#define SPI_RNPR 0x0110
-#define SPI_RNCR 0x0114
-#define SPI_TNPR 0x0118
-#define SPI_TNCR 0x011c
-#define SPI_PTCR 0x0120
-#define SPI_PTSR 0x0124
-
-/* Bitfields in CR */
-#define SPI_SPIEN_OFFSET 0
-#define SPI_SPIEN_SIZE 1
-#define SPI_SPIDIS_OFFSET 1
-#define SPI_SPIDIS_SIZE 1
-#define SPI_SWRST_OFFSET 7
-#define SPI_SWRST_SIZE 1
-#define SPI_LASTXFER_OFFSET 24
-#define SPI_LASTXFER_SIZE 1
-#define SPI_TXFCLR_OFFSET 16
-#define SPI_TXFCLR_SIZE 1
-#define SPI_RXFCLR_OFFSET 17
-#define SPI_RXFCLR_SIZE 1
-#define SPI_FIFOEN_OFFSET 30
-#define SPI_FIFOEN_SIZE 1
-#define SPI_FIFODIS_OFFSET 31
-#define SPI_FIFODIS_SIZE 1
-
-/* Bitfields in MR */
-#define SPI_MSTR_OFFSET 0
-#define SPI_MSTR_SIZE 1
-#define SPI_PS_OFFSET 1
-#define SPI_PS_SIZE 1
-#define SPI_PCSDEC_OFFSET 2
-#define SPI_PCSDEC_SIZE 1
-#define SPI_FDIV_OFFSET 3
-#define SPI_FDIV_SIZE 1
-#define SPI_MODFDIS_OFFSET 4
-#define SPI_MODFDIS_SIZE 1
-#define SPI_WDRBT_OFFSET 5
-#define SPI_WDRBT_SIZE 1
-#define SPI_LLB_OFFSET 7
-#define SPI_LLB_SIZE 1
-#define SPI_PCS_OFFSET 16
-#define SPI_PCS_SIZE 4
-#define SPI_DLYBCS_OFFSET 24
-#define SPI_DLYBCS_SIZE 8
-
-/* Bitfields in RDR */
-#define SPI_RD_OFFSET 0
-#define SPI_RD_SIZE 16
-
-/* Bitfields in TDR */
-#define SPI_TD_OFFSET 0
-#define SPI_TD_SIZE 16
-
-/* Bitfields in SR */
-#define SPI_RDRF_OFFSET 0
-#define SPI_RDRF_SIZE 1
-#define SPI_TDRE_OFFSET 1
-#define SPI_TDRE_SIZE 1
-#define SPI_MODF_OFFSET 2
-#define SPI_MODF_SIZE 1
-#define SPI_OVRES_OFFSET 3
-#define SPI_OVRES_SIZE 1
-#define SPI_ENDRX_OFFSET 4
-#define SPI_ENDRX_SIZE 1
-#define SPI_ENDTX_OFFSET 5
-#define SPI_ENDTX_SIZE 1
-#define SPI_RXBUFF_OFFSET 6
-#define SPI_RXBUFF_SIZE 1
-#define SPI_TXBUFE_OFFSET 7
-#define SPI_TXBUFE_SIZE 1
-#define SPI_NSSR_OFFSET 8
-#define SPI_NSSR_SIZE 1
-#define SPI_TXEMPTY_OFFSET 9
-#define SPI_TXEMPTY_SIZE 1
-#define SPI_SPIENS_OFFSET 16
-#define SPI_SPIENS_SIZE 1
-#define SPI_TXFEF_OFFSET 24
-#define SPI_TXFEF_SIZE 1
-#define SPI_TXFFF_OFFSET 25
-#define SPI_TXFFF_SIZE 1
-#define SPI_TXFTHF_OFFSET 26
-#define SPI_TXFTHF_SIZE 1
-#define SPI_RXFEF_OFFSET 27
-#define SPI_RXFEF_SIZE 1
-#define SPI_RXFFF_OFFSET 28
-#define SPI_RXFFF_SIZE 1
-#define SPI_RXFTHF_OFFSET 29
-#define SPI_RXFTHF_SIZE 1
-#define SPI_TXFPTEF_OFFSET 30
-#define SPI_TXFPTEF_SIZE 1
-#define SPI_RXFPTEF_OFFSET 31
-#define SPI_RXFPTEF_SIZE 1
-
-/* Bitfields in CSR0 */
-#define SPI_CPOL_OFFSET 0
-#define SPI_CPOL_SIZE 1
-#define SPI_NCPHA_OFFSET 1
-#define SPI_NCPHA_SIZE 1
-#define SPI_CSAAT_OFFSET 3
-#define SPI_CSAAT_SIZE 1
-#define SPI_BITS_OFFSET 4
-#define SPI_BITS_SIZE 4
-#define SPI_SCBR_OFFSET 8
-#define SPI_SCBR_SIZE 8
-#define SPI_DLYBS_OFFSET 16
-#define SPI_DLYBS_SIZE 8
-#define SPI_DLYBCT_OFFSET 24
-#define SPI_DLYBCT_SIZE 8
-
-/* Bitfields in RCR */
-#define SPI_RXCTR_OFFSET 0
-#define SPI_RXCTR_SIZE 16
-
-/* Bitfields in TCR */
-#define SPI_TXCTR_OFFSET 0
-#define SPI_TXCTR_SIZE 16
-
-/* Bitfields in RNCR */
-#define SPI_RXNCR_OFFSET 0
-#define SPI_RXNCR_SIZE 16
-
-/* Bitfields in TNCR */
-#define SPI_TXNCR_OFFSET 0
-#define SPI_TXNCR_SIZE 16
-
-/* Bitfields in PTCR */
-#define SPI_RXTEN_OFFSET 0
-#define SPI_RXTEN_SIZE 1
-#define SPI_RXTDIS_OFFSET 1
-#define SPI_RXTDIS_SIZE 1
-#define SPI_TXTEN_OFFSET 8
-#define SPI_TXTEN_SIZE 1
-#define SPI_TXTDIS_OFFSET 9
-#define SPI_TXTDIS_SIZE 1
-
-/* Bitfields in FMR */
-#define SPI_TXRDYM_OFFSET 0
-#define SPI_TXRDYM_SIZE 2
-#define SPI_RXRDYM_OFFSET 4
-#define SPI_RXRDYM_SIZE 2
-#define SPI_TXFTHRES_OFFSET 16
-#define SPI_TXFTHRES_SIZE 6
-#define SPI_RXFTHRES_OFFSET 24
-#define SPI_RXFTHRES_SIZE 6
-
-/* Bitfields in FLR */
-#define SPI_TXFL_OFFSET 0
-#define SPI_TXFL_SIZE 6
-#define SPI_RXFL_OFFSET 16
-#define SPI_RXFL_SIZE 6
-
-/* Constants for BITS */
-#define SPI_BITS_8_BPT 0
-#define SPI_BITS_9_BPT 1
-#define SPI_BITS_10_BPT 2
-#define SPI_BITS_11_BPT 3
-#define SPI_BITS_12_BPT 4
-#define SPI_BITS_13_BPT 5
-#define SPI_BITS_14_BPT 6
-#define SPI_BITS_15_BPT 7
-#define SPI_BITS_16_BPT 8
-#define SPI_ONE_DATA 0
-#define SPI_TWO_DATA 1
-#define SPI_FOUR_DATA 2
-
-/* Bit manipulation macros */
-#define SPI_BIT(name) \
- (1 << SPI_##name##_OFFSET)
-#define SPI_BF(name, value) \
- (((value) & ((1 << SPI_##name##_SIZE) - 1)) << SPI_##name##_OFFSET)
-#define SPI_BFEXT(name, value) \
- (((value) >> SPI_##name##_OFFSET) & ((1 << SPI_##name##_SIZE) - 1))
-#define SPI_BFINS(name, value, old) \
- (((old) & ~(((1 << SPI_##name##_SIZE) - 1) << SPI_##name##_OFFSET)) \
- | SPI_BF(name, value))
-
-/* Register access macros */
-#ifdef CONFIG_AVR32
-#define spi_readl(port, reg) \
- __raw_readl((port)->regs + SPI_##reg)
-#define spi_writel(port, reg, value) \
- __raw_writel((value), (port)->regs + SPI_##reg)
-
-#define spi_readw(port, reg) \
- __raw_readw((port)->regs + SPI_##reg)
-#define spi_writew(port, reg, value) \
- __raw_writew((value), (port)->regs + SPI_##reg)
-
-#define spi_readb(port, reg) \
- __raw_readb((port)->regs + SPI_##reg)
-#define spi_writeb(port, reg, value) \
- __raw_writeb((value), (port)->regs + SPI_##reg)
-#else
-#define spi_readl(port, reg) \
- readl_relaxed((port)->regs + SPI_##reg)
-#define spi_writel(port, reg, value) \
- writel_relaxed((value), (port)->regs + SPI_##reg)
-
-#define spi_readw(port, reg) \
- readw_relaxed((port)->regs + SPI_##reg)
-#define spi_writew(port, reg, value) \
- writew_relaxed((value), (port)->regs + SPI_##reg)
-
-#define spi_readb(port, reg) \
- readb_relaxed((port)->regs + SPI_##reg)
-#define spi_writeb(port, reg, value) \
- writeb_relaxed((value), (port)->regs + SPI_##reg)
-#endif
-/* use PIO for small transfers, avoiding DMA setup/teardown overhead and
- * cache operations; better heuristics consider wordsize and bitrate.
- */
-#define DMA_MIN_BYTES 16
-
-#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000))
-
-#define AUTOSUSPEND_TIMEOUT 2000
-
-struct atmel_spi_caps {
- bool is_spi2;
- bool has_wdrbt;
- bool has_dma_support;
- bool has_pdc_support;
-};
-
-/*
- * The core SPI transfer engine just talks to a register bank to set up
- * DMA transfers; transfer queue progress is driven by IRQs. The clock
- * framework provides the base clock, subdivided for each spi_device.
- */
-struct atmel_spi {
- spinlock_t lock;
- unsigned long flags;
-
- phys_addr_t phybase;
- void __iomem *regs;
- int irq;
- struct clk *clk;
- struct platform_device *pdev;
- unsigned long spi_clk;
-
- struct spi_transfer *current_transfer;
- int current_remaining_bytes;
- int done_status;
- dma_addr_t dma_addr_rx_bbuf;
- dma_addr_t dma_addr_tx_bbuf;
- void *addr_rx_bbuf;
- void *addr_tx_bbuf;
-
- struct completion xfer_completion;
-
- struct atmel_spi_caps caps;
-
- bool use_dma;
- bool use_pdc;
- bool use_cs_gpios;
-
- bool keep_cs;
- bool cs_active;
-
- u32 fifo_size;
-};
-
-/* Controller-specific per-slave state */
-struct atmel_spi_device {
- unsigned int npcs_pin;
- u32 csr;
-};
-
-#define SPI_MAX_DMA_XFER 65535 /* true for both PDC and DMA */
-#define INVALID_DMA_ADDRESS 0xffffffff
-
-/*
- * Version 2 of the SPI controller has
- * - CR.LASTXFER
- * - SPI_MR.DIV32 may become FDIV or must-be-zero (here: always zero)
- * - SPI_SR.TXEMPTY, SPI_SR.NSSR (and corresponding irqs)
- * - SPI_CSRx.CSAAT
- * - SPI_CSRx.SBCR allows faster clocking
- */
-static bool atmel_spi_is_v2(struct atmel_spi *as)
-{
- return as->caps.is_spi2;
-}
-
-/*
- * Earlier SPI controllers (e.g. on at91rm9200) have a design bug whereby
- * they assume that spi slave device state will not change on deselect, so
- * that automagic deselection is OK. ("NPCSx rises if no data is to be
- * transmitted") Not so! Workaround uses nCSx pins as GPIOs; or newer
- * controllers have CSAAT and friends.
- *
- * Since the CSAAT functionality is a bit weird on newer controllers as
- * well, we use GPIO to control nCSx pins on all controllers, updating
- * MR.PCS to avoid confusing the controller. Using GPIOs also lets us
- * support active-high chipselects despite the controller's belief that
- * only active-low devices/systems exists.
- *
- * However, at91rm9200 has a second erratum whereby nCS0 doesn't work
- * right when driven with GPIO. ("Mode Fault does not allow more than one
- * Master on Chip Select 0.") No workaround exists for that ... so for
- * nCS0 on that chip, we (a) don't use the GPIO, (b) can't support CS_HIGH,
- * and (c) will trigger that first erratum in some cases.
- */
-
-static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
-{
- struct atmel_spi_device *asd = spi->controller_state;
- unsigned active = spi->mode & SPI_CS_HIGH;
- u32 mr;
-
- if (atmel_spi_is_v2(as)) {
- spi_writel(as, CSR0 + 4 * spi->chip_select, asd->csr);
- /* For the low SPI version, there is a issue that PDC transfer
- * on CS1,2,3 needs SPI_CSR0.BITS config as SPI_CSR1,2,3.BITS
- */
- spi_writel(as, CSR0, asd->csr);
- if (as->caps.has_wdrbt) {
- spi_writel(as, MR,
- SPI_BF(PCS, ~(0x01 << spi->chip_select))
- | SPI_BIT(WDRBT)
- | SPI_BIT(MODFDIS)
- | SPI_BIT(MSTR));
- } else {
- spi_writel(as, MR,
- SPI_BF(PCS, ~(0x01 << spi->chip_select))
- | SPI_BIT(MODFDIS)
- | SPI_BIT(MSTR));
- }
-
- mr = spi_readl(as, MR);
- if (as->use_cs_gpios)
- gpio_set_value(asd->npcs_pin, active);
- } else {
- u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0;
- int i;
- u32 csr;
-
- /* Make sure clock polarity is correct */
- for (i = 0; i < spi->master->num_chipselect; i++) {
- csr = spi_readl(as, CSR0 + 4 * i);
- if ((csr ^ cpol) & SPI_BIT(CPOL))
- spi_writel(as, CSR0 + 4 * i,
- csr ^ SPI_BIT(CPOL));
- }
-
- mr = spi_readl(as, MR);
- mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr);
- if (as->use_cs_gpios && spi->chip_select != 0)
- gpio_set_value(asd->npcs_pin, active);
- spi_writel(as, MR, mr);
- }
-
- dev_dbg(&spi->dev, "activate %u%s, mr %08x\n",
- asd->npcs_pin, active ? " (high)" : "",
- mr);
-}
-
-static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
-{
- struct atmel_spi_device *asd = spi->controller_state;
- unsigned active = spi->mode & SPI_CS_HIGH;
- u32 mr;
-
- /* only deactivate *this* device; sometimes transfers to
- * another device may be active when this routine is called.
- */
- mr = spi_readl(as, MR);
- if (~SPI_BFEXT(PCS, mr) & (1 << spi->chip_select)) {
- mr = SPI_BFINS(PCS, 0xf, mr);
- spi_writel(as, MR, mr);
- }
-
- dev_dbg(&spi->dev, "DEactivate %u%s, mr %08x\n",
- asd->npcs_pin, active ? " (low)" : "",
- mr);
-
- if (!as->use_cs_gpios)
- spi_writel(as, CR, SPI_BIT(LASTXFER));
- else if (atmel_spi_is_v2(as) || spi->chip_select != 0)
- gpio_set_value(asd->npcs_pin, !active);
-}
-
-static void atmel_spi_lock(struct atmel_spi *as) __acquires(&as->lock)
-{
- spin_lock_irqsave(&as->lock, as->flags);
-}
-
-static void atmel_spi_unlock(struct atmel_spi *as) __releases(&as->lock)
-{
- spin_unlock_irqrestore(&as->lock, as->flags);
-}
-
-static inline bool atmel_spi_is_vmalloc_xfer(struct spi_transfer *xfer)
-{
- return is_vmalloc_addr(xfer->tx_buf) || is_vmalloc_addr(xfer->rx_buf);
-}
-
-static inline bool atmel_spi_use_dma(struct atmel_spi *as,
- struct spi_transfer *xfer)
-{
- return as->use_dma && xfer->len >= DMA_MIN_BYTES;
-}
-
-static bool atmel_spi_can_dma(struct spi_master *master,
- struct spi_device *spi,
- struct spi_transfer *xfer)
-{
- struct atmel_spi *as = spi_master_get_devdata(master);
-
- if (IS_ENABLED(CONFIG_SOC_SAM_V4_V5))
- return atmel_spi_use_dma(as, xfer) &&
- !atmel_spi_is_vmalloc_xfer(xfer);
- else
- return atmel_spi_use_dma(as, xfer);
-
-}
-
-static int atmel_spi_dma_slave_config(struct atmel_spi *as,
- struct dma_slave_config *slave_config,
- u8 bits_per_word)
-{
- struct spi_master *master = platform_get_drvdata(as->pdev);
- int err = 0;
-
- if (bits_per_word > 8) {
- slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
- slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
- } else {
- slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- }
-
- slave_config->dst_addr = (dma_addr_t)as->phybase + SPI_TDR;
- slave_config->src_addr = (dma_addr_t)as->phybase + SPI_RDR;
- slave_config->src_maxburst = 1;
- slave_config->dst_maxburst = 1;
- slave_config->device_fc = false;
-
- /*
- * This driver uses fixed peripheral select mode (PS bit set to '0' in
- * the Mode Register).
- * So according to the datasheet, when FIFOs are available (and
- * enabled), the Transmit FIFO operates in Multiple Data Mode.
- * In this mode, up to 2 data, not 4, can be written into the Transmit
- * Data Register in a single access.
- * However, the first data has to be written into the lowest 16 bits and
- * the second data into the highest 16 bits of the Transmit
- * Data Register. For 8bit data (the most frequent case), it would
- * require to rework tx_buf so each data would actualy fit 16 bits.
- * So we'd rather write only one data at the time. Hence the transmit
- * path works the same whether FIFOs are available (and enabled) or not.
- */
- slave_config->direction = DMA_MEM_TO_DEV;
- if (dmaengine_slave_config(master->dma_tx, slave_config)) {
- dev_err(&as->pdev->dev,
- "failed to configure tx dma channel\n");
- err = -EINVAL;
- }
-
- /*
- * This driver configures the spi controller for master mode (MSTR bit
- * set to '1' in the Mode Register).
- * So according to the datasheet, when FIFOs are available (and
- * enabled), the Receive FIFO operates in Single Data Mode.
- * So the receive path works the same whether FIFOs are available (and
- * enabled) or not.
- */
- slave_config->direction = DMA_DEV_TO_MEM;
- if (dmaengine_slave_config(master->dma_rx, slave_config)) {
- dev_err(&as->pdev->dev,
- "failed to configure rx dma channel\n");
- err = -EINVAL;
- }
-
- return err;
-}
-
-static int atmel_spi_configure_dma(struct spi_master *master,
- struct atmel_spi *as)
-{
- struct dma_slave_config slave_config;
- struct device *dev = &as->pdev->dev;
- int err;
-
- dma_cap_mask_t mask;
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
-
- master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
- if (IS_ERR(master->dma_tx)) {
- err = PTR_ERR(master->dma_tx);
- if (err == -EPROBE_DEFER) {
- dev_warn(dev, "no DMA channel available at the moment\n");
- goto error_clear;
- }
- dev_err(dev,
- "DMA TX channel not available, SPI unable to use DMA\n");
- err = -EBUSY;
- goto error_clear;
- }
-
- /*
- * No reason to check EPROBE_DEFER here since we have already requested
- * tx channel. If it fails here, it's for another reason.
- */
- master->dma_rx = dma_request_slave_channel(dev, "rx");
-
- if (!master->dma_rx) {
- dev_err(dev,
- "DMA RX channel not available, SPI unable to use DMA\n");
- err = -EBUSY;
- goto error;
- }
-
- err = atmel_spi_dma_slave_config(as, &slave_config, 8);
- if (err)
- goto error;
-
- dev_info(&as->pdev->dev,
- "Using %s (tx) and %s (rx) for DMA transfers\n",
- dma_chan_name(master->dma_tx),
- dma_chan_name(master->dma_rx));
-
- return 0;
-error:
- if (master->dma_rx)
- dma_release_channel(master->dma_rx);
- if (!IS_ERR(master->dma_tx))
- dma_release_channel(master->dma_tx);
-error_clear:
- master->dma_tx = master->dma_rx = NULL;
- return err;
-}
-
-static void atmel_spi_stop_dma(struct spi_master *master)
-{
- if (master->dma_rx)
- dmaengine_terminate_all(master->dma_rx);
- if (master->dma_tx)
- dmaengine_terminate_all(master->dma_tx);
-}
-
-static void atmel_spi_release_dma(struct spi_master *master)
-{
- if (master->dma_rx) {
- dma_release_channel(master->dma_rx);
- master->dma_rx = NULL;
- }
- if (master->dma_tx) {
- dma_release_channel(master->dma_tx);
- master->dma_tx = NULL;
- }
-}
-
-/* This function is called by the DMA driver from tasklet context */
-static void dma_callback(void *data)
-{
- struct spi_master *master = data;
- struct atmel_spi *as = spi_master_get_devdata(master);
-
- if (is_vmalloc_addr(as->current_transfer->rx_buf) &&
- IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) {
- memcpy(as->current_transfer->rx_buf, as->addr_rx_bbuf,
- as->current_transfer->len);
- }
- complete(&as->xfer_completion);
-}
-
-/*
- * Next transfer using PIO without FIFO.
- */
-static void atmel_spi_next_xfer_single(struct spi_master *master,
- struct spi_transfer *xfer)
-{
- struct atmel_spi *as = spi_master_get_devdata(master);
- unsigned long xfer_pos = xfer->len - as->current_remaining_bytes;
-
- dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_pio\n");
-
- /* Make sure data is not remaining in RDR */
- spi_readl(as, RDR);
- while (spi_readl(as, SR) & SPI_BIT(RDRF)) {
- spi_readl(as, RDR);
- cpu_relax();
- }
-
- if (xfer->bits_per_word > 8)
- spi_writel(as, TDR, *(u16 *)(xfer->tx_buf + xfer_pos));
- else
- spi_writel(as, TDR, *(u8 *)(xfer->tx_buf + xfer_pos));
-
- dev_dbg(master->dev.parent,
- " start pio xfer %p: len %u tx %p rx %p bitpw %d\n",
- xfer, xfer->len, xfer->tx_buf, xfer->rx_buf,
- xfer->bits_per_word);
-
- /* Enable relevant interrupts */
- spi_writel(as, IER, SPI_BIT(RDRF) | SPI_BIT(OVRES));
-}
-
-/*
- * Next transfer using PIO with FIFO.
- */
-static void atmel_spi_next_xfer_fifo(struct spi_master *master,
- struct spi_transfer *xfer)
-{
- struct atmel_spi *as = spi_master_get_devdata(master);
- u32 current_remaining_data, num_data;
- u32 offset = xfer->len - as->current_remaining_bytes;
- const u16 *words = (const u16 *)((u8 *)xfer->tx_buf + offset);
- const u8 *bytes = (const u8 *)((u8 *)xfer->tx_buf + offset);
- u16 td0, td1;
- u32 fifomr;
-
- dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_fifo\n");
-
- /* Compute the number of data to transfer in the current iteration */
- current_remaining_data = ((xfer->bits_per_word > 8) ?
- ((u32)as->current_remaining_bytes >> 1) :
- (u32)as->current_remaining_bytes);
- num_data = min(current_remaining_data, as->fifo_size);
-
- /* Flush RX and TX FIFOs */
- spi_writel(as, CR, SPI_BIT(RXFCLR) | SPI_BIT(TXFCLR));
- while (spi_readl(as, FLR))
- cpu_relax();
-
- /* Set RX FIFO Threshold to the number of data to transfer */
- fifomr = spi_readl(as, FMR);
- spi_writel(as, FMR, SPI_BFINS(RXFTHRES, num_data, fifomr));
-
- /* Clear FIFO flags in the Status Register, especially RXFTHF */
- (void)spi_readl(as, SR);
-
- /* Fill TX FIFO */
- while (num_data >= 2) {
- if (xfer->bits_per_word > 8) {
- td0 = *words++;
- td1 = *words++;
- } else {
- td0 = *bytes++;
- td1 = *bytes++;
- }
-
- spi_writel(as, TDR, (td1 << 16) | td0);
- num_data -= 2;
- }
-
- if (num_data) {
- if (xfer->bits_per_word > 8)
- td0 = *words++;
- else
- td0 = *bytes++;
-
- spi_writew(as, TDR, td0);
- num_data--;
- }
-
- dev_dbg(master->dev.parent,
- " start fifo xfer %p: len %u tx %p rx %p bitpw %d\n",
- xfer, xfer->len, xfer->tx_buf, xfer->rx_buf,
- xfer->bits_per_word);
-
- /*
- * Enable RX FIFO Threshold Flag interrupt to be notified about
- * transfer completion.
- */
- spi_writel(as, IER, SPI_BIT(RXFTHF) | SPI_BIT(OVRES));
-}
-
-/*
- * Next transfer using PIO.
- */
-static void atmel_spi_next_xfer_pio(struct spi_master *master,
- struct spi_transfer *xfer)
-{
- struct atmel_spi *as = spi_master_get_devdata(master);
-
- if (as->fifo_size)
- atmel_spi_next_xfer_fifo(master, xfer);
- else
- atmel_spi_next_xfer_single(master, xfer);
-}
-
-/*
- * Submit next transfer for DMA.
- */
-static int atmel_spi_next_xfer_dma_submit(struct spi_master *master,
- struct spi_transfer *xfer,
- u32 *plen)
-{
- struct atmel_spi *as = spi_master_get_devdata(master);
- struct dma_chan *rxchan = master->dma_rx;
- struct dma_chan *txchan = master->dma_tx;
- struct dma_async_tx_descriptor *rxdesc;
- struct dma_async_tx_descriptor *txdesc;
- struct dma_slave_config slave_config;
- dma_cookie_t cookie;
-
- dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_dma_submit\n");
-
- /* Check that the channels are available */
- if (!rxchan || !txchan)
- return -ENODEV;
-
- /* release lock for DMA operations */
- atmel_spi_unlock(as);
-
- *plen = xfer->len;
-
- if (atmel_spi_dma_slave_config(as, &slave_config,
- xfer->bits_per_word))
- goto err_exit;
-
- /* Send both scatterlists */
- if (atmel_spi_is_vmalloc_xfer(xfer) &&
- IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) {
- rxdesc = dmaengine_prep_slave_single(rxchan,
- as->dma_addr_rx_bbuf,
- xfer->len,
- DMA_DEV_TO_MEM,
- DMA_PREP_INTERRUPT |
- DMA_CTRL_ACK);
- } else {
- rxdesc = dmaengine_prep_slave_sg(rxchan,
- xfer->rx_sg.sgl,
- xfer->rx_sg.nents,
- DMA_DEV_TO_MEM,
- DMA_PREP_INTERRUPT |
- DMA_CTRL_ACK);
- }
- if (!rxdesc)
- goto err_dma;
-
- if (atmel_spi_is_vmalloc_xfer(xfer) &&
- IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) {
- memcpy(as->addr_tx_bbuf, xfer->tx_buf, xfer->len);
- txdesc = dmaengine_prep_slave_single(txchan,
- as->dma_addr_tx_bbuf,
- xfer->len, DMA_MEM_TO_DEV,
- DMA_PREP_INTERRUPT |
- DMA_CTRL_ACK);
- } else {
- txdesc = dmaengine_prep_slave_sg(txchan,
- xfer->tx_sg.sgl,
- xfer->tx_sg.nents,
- DMA_MEM_TO_DEV,
- DMA_PREP_INTERRUPT |
- DMA_CTRL_ACK);
- }
- if (!txdesc)
- goto err_dma;
-
- dev_dbg(master->dev.parent,
- " start dma xfer %p: len %u tx %p/%08llx rx %p/%08llx\n",
- xfer, xfer->len, xfer->tx_buf, (unsigned long long)xfer->tx_dma,
- xfer->rx_buf, (unsigned long long)xfer->rx_dma);
-
- /* Enable relevant interrupts */
- spi_writel(as, IER, SPI_BIT(OVRES));
-
- /* Put the callback on the RX transfer only, that should finish last */
- rxdesc->callback = dma_callback;
- rxdesc->callback_param = master;
-
- /* Submit and fire RX and TX with TX last so we're ready to read! */
- cookie = rxdesc->tx_submit(rxdesc);
- if (dma_submit_error(cookie))
- goto err_dma;
- cookie = txdesc->tx_submit(txdesc);
- if (dma_submit_error(cookie))
- goto err_dma;
- rxchan->device->device_issue_pending(rxchan);
- txchan->device->device_issue_pending(txchan);
-
- /* take back lock */
- atmel_spi_lock(as);
- return 0;
-
-err_dma:
- spi_writel(as, IDR, SPI_BIT(OVRES));
- atmel_spi_stop_dma(master);
-err_exit:
- atmel_spi_lock(as);
- return -ENOMEM;
-}
-
-static void atmel_spi_next_xfer_data(struct spi_master *master,
- struct spi_transfer *xfer,
- dma_addr_t *tx_dma,
- dma_addr_t *rx_dma,
- u32 *plen)
-{
- *rx_dma = xfer->rx_dma + xfer->len - *plen;
- *tx_dma = xfer->tx_dma + xfer->len - *plen;
- if (*plen > master->max_dma_len)
- *plen = master->max_dma_len;
-}
-
-static int atmel_spi_set_xfer_speed(struct atmel_spi *as,
- struct spi_device *spi,
- struct spi_transfer *xfer)
-{
- u32 scbr, csr;
- unsigned long bus_hz;
-
- /* v1 chips start out at half the peripheral bus speed. */
- bus_hz = as->spi_clk;
- if (!atmel_spi_is_v2(as))
- bus_hz /= 2;
-
- /*
- * Calculate the lowest divider that satisfies the
- * constraint, assuming div32/fdiv/mbz == 0.
- */
- scbr = DIV_ROUND_UP(bus_hz, xfer->speed_hz);
-
- /*
- * If the resulting divider doesn't fit into the
- * register bitfield, we can't satisfy the constraint.
- */
- if (scbr >= (1 << SPI_SCBR_SIZE)) {
- dev_err(&spi->dev,
- "setup: %d Hz too slow, scbr %u; min %ld Hz\n",
- xfer->speed_hz, scbr, bus_hz/255);
- return -EINVAL;
- }
- if (scbr == 0) {
- dev_err(&spi->dev,
- "setup: %d Hz too high, scbr %u; max %ld Hz\n",
- xfer->speed_hz, scbr, bus_hz);
- return -EINVAL;
- }
- csr = spi_readl(as, CSR0 + 4 * spi->chip_select);
- csr = SPI_BFINS(SCBR, scbr, csr);
- spi_writel(as, CSR0 + 4 * spi->chip_select, csr);
-
- return 0;
-}
-
-/*
- * Submit next transfer for PDC.
- * lock is held, spi irq is blocked
- */
-static void atmel_spi_pdc_next_xfer(struct spi_master *master,
- struct spi_message *msg,
- struct spi_transfer *xfer)
-{
- struct atmel_spi *as = spi_master_get_devdata(master);
- u32 len;
- dma_addr_t tx_dma, rx_dma;
-
- spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
-
- len = as->current_remaining_bytes;
- atmel_spi_next_xfer_data(master, xfer, &tx_dma, &rx_dma, &len);
- as->current_remaining_bytes -= len;
-
- spi_writel(as, RPR, rx_dma);
- spi_writel(as, TPR, tx_dma);
-
- if (msg->spi->bits_per_word > 8)
- len >>= 1;
- spi_writel(as, RCR, len);
- spi_writel(as, TCR, len);
-
- dev_dbg(&msg->spi->dev,
- " start xfer %p: len %u tx %p/%08llx rx %p/%08llx\n",
- xfer, xfer->len, xfer->tx_buf,
- (unsigned long long)xfer->tx_dma, xfer->rx_buf,
- (unsigned long long)xfer->rx_dma);
-
- if (as->current_remaining_bytes) {
- len = as->current_remaining_bytes;
- atmel_spi_next_xfer_data(master, xfer, &tx_dma, &rx_dma, &len);
- as->current_remaining_bytes -= len;
-
- spi_writel(as, RNPR, rx_dma);
- spi_writel(as, TNPR, tx_dma);
-
- if (msg->spi->bits_per_word > 8)
- len >>= 1;
- spi_writel(as, RNCR, len);
- spi_writel(as, TNCR, len);
-
- dev_dbg(&msg->spi->dev,
- " next xfer %p: len %u tx %p/%08llx rx %p/%08llx\n",
- xfer, xfer->len, xfer->tx_buf,
- (unsigned long long)xfer->tx_dma, xfer->rx_buf,
- (unsigned long long)xfer->rx_dma);
- }
-
- /* REVISIT: We're waiting for RXBUFF before we start the next
- * transfer because we need to handle some difficult timing
- * issues otherwise. If we wait for TXBUFE in one transfer and
- * then starts waiting for RXBUFF in the next, it's difficult
- * to tell the difference between the RXBUFF interrupt we're
- * actually waiting for and the RXBUFF interrupt of the
- * previous transfer.
- *
- * It should be doable, though. Just not now...
- */
- spi_writel(as, IER, SPI_BIT(RXBUFF) | SPI_BIT(OVRES));
- spi_writel(as, PTCR, SPI_BIT(TXTEN) | SPI_BIT(RXTEN));
-}
-
-/*
- * For DMA, tx_buf/tx_dma have the same relationship as rx_buf/rx_dma:
- * - The buffer is either valid for CPU access, else NULL
- * - If the buffer is valid, so is its DMA address
- *
- * This driver manages the dma address unless message->is_dma_mapped.
- */
-static int
-atmel_spi_dma_map_xfer(struct atmel_spi *as, struct spi_transfer *xfer)
-{
- struct device *dev = &as->pdev->dev;
-
- xfer->tx_dma = xfer->rx_dma = INVALID_DMA_ADDRESS;
- if (xfer->tx_buf) {
- /* tx_buf is a const void* where we need a void * for the dma
- * mapping */
- void *nonconst_tx = (void *)xfer->tx_buf;
-
- xfer->tx_dma = dma_map_single(dev,
- nonconst_tx, xfer->len,
- DMA_TO_DEVICE);
- if (dma_mapping_error(dev, xfer->tx_dma))
- return -ENOMEM;
- }
- if (xfer->rx_buf) {
- xfer->rx_dma = dma_map_single(dev,
- xfer->rx_buf, xfer->len,
- DMA_FROM_DEVICE);
- if (dma_mapping_error(dev, xfer->rx_dma)) {
- if (xfer->tx_buf)
- dma_unmap_single(dev,
- xfer->tx_dma, xfer->len,
- DMA_TO_DEVICE);
- return -ENOMEM;
- }
- }
- return 0;
-}
-
-static void atmel_spi_dma_unmap_xfer(struct spi_master *master,
- struct spi_transfer *xfer)
-{
- if (xfer->tx_dma != INVALID_DMA_ADDRESS)
- dma_unmap_single(master->dev.parent, xfer->tx_dma,
- xfer->len, DMA_TO_DEVICE);
- if (xfer->rx_dma != INVALID_DMA_ADDRESS)
- dma_unmap_single(master->dev.parent, xfer->rx_dma,
- xfer->len, DMA_FROM_DEVICE);
-}
-
-static void atmel_spi_disable_pdc_transfer(struct atmel_spi *as)
-{
- spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
-}
-
-static void
-atmel_spi_pump_single_data(struct atmel_spi *as, struct spi_transfer *xfer)
-{
- u8 *rxp;
- u16 *rxp16;
- unsigned long xfer_pos = xfer->len - as->current_remaining_bytes;
-
- if (xfer->bits_per_word > 8) {
- rxp16 = (u16 *)(((u8 *)xfer->rx_buf) + xfer_pos);
- *rxp16 = spi_readl(as, RDR);
- } else {
- rxp = ((u8 *)xfer->rx_buf) + xfer_pos;
- *rxp = spi_readl(as, RDR);
- }
- if (xfer->bits_per_word > 8) {
- if (as->current_remaining_bytes > 2)
- as->current_remaining_bytes -= 2;
- else
- as->current_remaining_bytes = 0;
- } else {
- as->current_remaining_bytes--;
- }
-}
-
-static void
-atmel_spi_pump_fifo_data(struct atmel_spi *as, struct spi_transfer *xfer)
-{
- u32 fifolr = spi_readl(as, FLR);
- u32 num_bytes, num_data = SPI_BFEXT(RXFL, fifolr);
- u32 offset = xfer->len - as->current_remaining_bytes;
- u16 *words = (u16 *)((u8 *)xfer->rx_buf + offset);
- u8 *bytes = (u8 *)((u8 *)xfer->rx_buf + offset);
- u16 rd; /* RD field is the lowest 16 bits of RDR */
-
- /* Update the number of remaining bytes to transfer */
- num_bytes = ((xfer->bits_per_word > 8) ?
- (num_data << 1) :
- num_data);
-
- if (as->current_remaining_bytes > num_bytes)
- as->current_remaining_bytes -= num_bytes;
- else
- as->current_remaining_bytes = 0;
-
- /* Handle odd number of bytes when data are more than 8bit width */
- if (xfer->bits_per_word > 8)
- as->current_remaining_bytes &= ~0x1;
-
- /* Read data */
- while (num_data) {
- rd = spi_readl(as, RDR);
- if (xfer->bits_per_word > 8)
- *words++ = rd;
- else
- *bytes++ = rd;
- num_data--;
- }
-}
-
-/* Called from IRQ
- *
- * Must update "current_remaining_bytes" to keep track of data
- * to transfer.
- */
-static void
-atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
-{
- if (as->fifo_size)
- atmel_spi_pump_fifo_data(as, xfer);
- else
- atmel_spi_pump_single_data(as, xfer);
-}
-
-/* Interrupt
- *
- * No need for locking in this Interrupt handler: done_status is the
- * only information modified.
- */
-static irqreturn_t
-atmel_spi_pio_interrupt(int irq, void *dev_id)
-{
- struct spi_master *master = dev_id;
- struct atmel_spi *as = spi_master_get_devdata(master);
- u32 status, pending, imr;
- struct spi_transfer *xfer;
- int ret = IRQ_NONE;
-
- imr = spi_readl(as, IMR);
- status = spi_readl(as, SR);
- pending = status & imr;
-
- if (pending & SPI_BIT(OVRES)) {
- ret = IRQ_HANDLED;
- spi_writel(as, IDR, SPI_BIT(OVRES));
- dev_warn(master->dev.parent, "overrun\n");
-
- /*
- * When we get an overrun, we disregard the current
- * transfer. Data will not be copied back from any
- * bounce buffer and msg->actual_len will not be
- * updated with the last xfer.
- *
- * We will also not process any remaning transfers in
- * the message.
- */
- as->done_status = -EIO;
- smp_wmb();
-
- /* Clear any overrun happening while cleaning up */
- spi_readl(as, SR);
-
- complete(&as->xfer_completion);
-
- } else if (pending & (SPI_BIT(RDRF) | SPI_BIT(RXFTHF))) {
- atmel_spi_lock(as);
-
- if (as->current_remaining_bytes) {
- ret = IRQ_HANDLED;
- xfer = as->current_transfer;
- atmel_spi_pump_pio_data(as, xfer);
- if (!as->current_remaining_bytes)
- spi_writel(as, IDR, pending);
-
- complete(&as->xfer_completion);
- }
-
- atmel_spi_unlock(as);
- } else {
- WARN_ONCE(pending, "IRQ not handled, pending = %x\n", pending);
- ret = IRQ_HANDLED;
- spi_writel(as, IDR, pending);
- }
-
- return ret;
-}
-
-static irqreturn_t
-atmel_spi_pdc_interrupt(int irq, void *dev_id)
-{
- struct spi_master *master = dev_id;
- struct atmel_spi *as = spi_master_get_devdata(master);
- u32 status, pending, imr;
- int ret = IRQ_NONE;
-
- imr = spi_readl(as, IMR);
- status = spi_readl(as, SR);
- pending = status & imr;
-
- if (pending & SPI_BIT(OVRES)) {
-
- ret = IRQ_HANDLED;
-
- spi_writel(as, IDR, (SPI_BIT(RXBUFF) | SPI_BIT(ENDRX)
- | SPI_BIT(OVRES)));
-
- /* Clear any overrun happening while cleaning up */
- spi_readl(as, SR);
-
- as->done_status = -EIO;
-
- complete(&as->xfer_completion);
-
- } else if (pending & (SPI_BIT(RXBUFF) | SPI_BIT(ENDRX))) {
- ret = IRQ_HANDLED;
-
- spi_writel(as, IDR, pending);
-
- complete(&as->xfer_completion);
- }
-
- return ret;
-}
-
-static int atmel_spi_setup(struct spi_device *spi)
-{
- struct atmel_spi *as;
- struct atmel_spi_device *asd;
- u32 csr;
- unsigned int bits = spi->bits_per_word;
- unsigned int npcs_pin;
-
- as = spi_master_get_devdata(spi->master);
-
- /* see notes above re chipselect */
- if (!atmel_spi_is_v2(as)
- && spi->chip_select == 0
- && (spi->mode & SPI_CS_HIGH)) {
- dev_dbg(&spi->dev, "setup: can't be active-high\n");
- return -EINVAL;
- }
-
- csr = SPI_BF(BITS, bits - 8);
- if (spi->mode & SPI_CPOL)
- csr |= SPI_BIT(CPOL);
- if (!(spi->mode & SPI_CPHA))
- csr |= SPI_BIT(NCPHA);
- if (!as->use_cs_gpios)
- csr |= SPI_BIT(CSAAT);
-
- /* DLYBS is mostly irrelevant since we manage chipselect using GPIOs.
- *
- * DLYBCT would add delays between words, slowing down transfers.
- * It could potentially be useful to cope with DMA bottlenecks, but
- * in those cases it's probably best to just use a lower bitrate.
- */
- csr |= SPI_BF(DLYBS, 0);
- csr |= SPI_BF(DLYBCT, 0);
-
- /* chipselect must have been muxed as GPIO (e.g. in board setup) */
- npcs_pin = (unsigned long)spi->controller_data;
-
- if (!as->use_cs_gpios)
- npcs_pin = spi->chip_select;
- else if (gpio_is_valid(spi->cs_gpio))
- npcs_pin = spi->cs_gpio;
-
- asd = spi->controller_state;
- if (!asd) {
- asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL);
- if (!asd)
- return -ENOMEM;
-
- if (as->use_cs_gpios)
- gpio_direction_output(npcs_pin,
- !(spi->mode & SPI_CS_HIGH));
-
- asd->npcs_pin = npcs_pin;
- spi->controller_state = asd;
- }
-
- asd->csr = csr;
-
- dev_dbg(&spi->dev,
- "setup: bpw %u mode 0x%x -> csr%d %08x\n",
- bits, spi->mode, spi->chip_select, csr);
-
- if (!atmel_spi_is_v2(as))
- spi_writel(as, CSR0 + 4 * spi->chip_select, csr);
-
- return 0;
-}
-
-static int atmel_spi_one_transfer(struct spi_master *master,
- struct spi_message *msg,
- struct spi_transfer *xfer)
-{
- struct atmel_spi *as;
- struct spi_device *spi = msg->spi;
- u8 bits;
- u32 len;
- struct atmel_spi_device *asd;
- int timeout;
- int ret;
- unsigned long dma_timeout;
-
- as = spi_master_get_devdata(master);
-
- if (!(xfer->tx_buf || xfer->rx_buf) && xfer->len) {
- dev_dbg(&spi->dev, "missing rx or tx buf\n");
- return -EINVAL;
- }
-
- asd = spi->controller_state;
- bits = (asd->csr >> 4) & 0xf;
- if (bits != xfer->bits_per_word - 8) {
- dev_dbg(&spi->dev,
- "you can't yet change bits_per_word in transfers\n");
- return -ENOPROTOOPT;
- }
-
- /*
- * DMA map early, for performance (empties dcache ASAP) and
- * better fault reporting.
- */
- if ((!msg->is_dma_mapped)
- && as->use_pdc) {
- if (atmel_spi_dma_map_xfer(as, xfer) < 0)
- return -ENOMEM;
- }
-
- atmel_spi_set_xfer_speed(as, msg->spi, xfer);
-
- as->done_status = 0;
- as->current_transfer = xfer;
- as->current_remaining_bytes = xfer->len;
- while (as->current_remaining_bytes) {
- reinit_completion(&as->xfer_completion);
-
- if (as->use_pdc) {
- atmel_spi_pdc_next_xfer(master, msg, xfer);
- } else if (atmel_spi_use_dma(as, xfer)) {
- len = as->current_remaining_bytes;
- ret = atmel_spi_next_xfer_dma_submit(master,
- xfer, &len);
- if (ret) {
- dev_err(&spi->dev,
- "unable to use DMA, fallback to PIO\n");
- atmel_spi_next_xfer_pio(master, xfer);
- } else {
- as->current_remaining_bytes -= len;
- if (as->current_remaining_bytes < 0)
- as->current_remaining_bytes = 0;
- }
- } else {
- atmel_spi_next_xfer_pio(master, xfer);
- }
-
- /* interrupts are disabled, so free the lock for schedule */
- atmel_spi_unlock(as);
- dma_timeout = wait_for_completion_timeout(&as->xfer_completion,
- SPI_DMA_TIMEOUT);
- atmel_spi_lock(as);
- if (WARN_ON(dma_timeout == 0)) {
- dev_err(&spi->dev, "spi transfer timeout\n");
- as->done_status = -EIO;
- }
-
- if (as->done_status)
- break;
- }
-
- if (as->done_status) {
- if (as->use_pdc) {
- dev_warn(master->dev.parent,
- "overrun (%u/%u remaining)\n",
- spi_readl(as, TCR), spi_readl(as, RCR));
-
- /*
- * Clean up DMA registers and make sure the data
- * registers are empty.
- */
- spi_writel(as, RNCR, 0);
- spi_writel(as, TNCR, 0);
- spi_writel(as, RCR, 0);
- spi_writel(as, TCR, 0);
- for (timeout = 1000; timeout; timeout--)
- if (spi_readl(as, SR) & SPI_BIT(TXEMPTY))
- break;
- if (!timeout)
- dev_warn(master->dev.parent,
- "timeout waiting for TXEMPTY");
- while (spi_readl(as, SR) & SPI_BIT(RDRF))
- spi_readl(as, RDR);
-
- /* Clear any overrun happening while cleaning up */
- spi_readl(as, SR);
-
- } else if (atmel_spi_use_dma(as, xfer)) {
- atmel_spi_stop_dma(master);
- }
-
- if (!msg->is_dma_mapped
- && as->use_pdc)
- atmel_spi_dma_unmap_xfer(master, xfer);
-
- return 0;
-
- } else {
- /* only update length if no error */
- msg->actual_length += xfer->len;
- }
-
- if (!msg->is_dma_mapped
- && as->use_pdc)
- atmel_spi_dma_unmap_xfer(master, xfer);
-
- if (xfer->delay_usecs)
- udelay(xfer->delay_usecs);
-
- if (xfer->cs_change) {
- if (list_is_last(&xfer->transfer_list,
- &msg->transfers)) {
- as->keep_cs = true;
- } else {
- as->cs_active = !as->cs_active;
- if (as->cs_active)
- cs_activate(as, msg->spi);
- else
- cs_deactivate(as, msg->spi);
- }
- }
-
- return 0;
-}
-
-static int atmel_spi_transfer_one_message(struct spi_master *master,
- struct spi_message *msg)
-{
- struct atmel_spi *as;
- struct spi_transfer *xfer;
- struct spi_device *spi = msg->spi;
- int ret = 0;
-
- as = spi_master_get_devdata(master);
-
- dev_dbg(&spi->dev, "new message %p submitted for %s\n",
- msg, dev_name(&spi->dev));
-
- atmel_spi_lock(as);
- cs_activate(as, spi);
-
- as->cs_active = true;
- as->keep_cs = false;
-
- msg->status = 0;
- msg->actual_length = 0;
-
- list_for_each_entry(xfer, &msg->transfers, transfer_list) {
- ret = atmel_spi_one_transfer(master, msg, xfer);
- if (ret)
- goto msg_done;
- }
-
- if (as->use_pdc)
- atmel_spi_disable_pdc_transfer(as);
-
- list_for_each_entry(xfer, &msg->transfers, transfer_list) {
- dev_dbg(&spi->dev,
- " xfer %p: len %u tx %p/%pad rx %p/%pad\n",
- xfer, xfer->len,
- xfer->tx_buf, &xfer->tx_dma,
- xfer->rx_buf, &xfer->rx_dma);
- }
-
-msg_done:
- if (!as->keep_cs)
- cs_deactivate(as, msg->spi);
-
- atmel_spi_unlock(as);
-
- msg->status = as->done_status;
- spi_finalize_current_message(spi->master);
-
- return ret;
-}
-
-static void atmel_spi_cleanup(struct spi_device *spi)
-{
- struct atmel_spi_device *asd = spi->controller_state;
-
- if (!asd)
- return;
-
- spi->controller_state = NULL;
- kfree(asd);
-}
-
-static inline unsigned int atmel_get_version(struct atmel_spi *as)
-{
- return spi_readl(as, VERSION) & 0x00000fff;
-}
-
-static void atmel_get_caps(struct atmel_spi *as)
-{
- unsigned int version;
-
- version = atmel_get_version(as);
-
- as->caps.is_spi2 = version > 0x121;
- as->caps.has_wdrbt = version >= 0x210;
- as->caps.has_dma_support = version >= 0x212;
- as->caps.has_pdc_support = version < 0x212;
-}
-
-/*-------------------------------------------------------------------------*/
-static int atmel_spi_gpio_cs(struct platform_device *pdev)
-{
- struct spi_master *master = platform_get_drvdata(pdev);
- struct atmel_spi *as = spi_master_get_devdata(master);
- struct device_node *np = master->dev.of_node;
- int i;
- int ret = 0;
- int nb = 0;
-
- if (!as->use_cs_gpios)
- return 0;
-
- if (!np)
- return 0;
-
- nb = of_gpio_named_count(np, "cs-gpios");
- for (i = 0; i < nb; i++) {
- int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
- "cs-gpios", i);
-
- if (cs_gpio == -EPROBE_DEFER)
- return cs_gpio;
-
- if (gpio_is_valid(cs_gpio)) {
- ret = devm_gpio_request(&pdev->dev, cs_gpio,
- dev_name(&pdev->dev));
- if (ret)
- return ret;
- }
- }
-
- return 0;
-}
-
-static void atmel_spi_init(struct atmel_spi *as)
-{
- spi_writel(as, CR, SPI_BIT(SWRST));
- spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
-
- /* It is recommended to enable FIFOs first thing after reset */
- if (as->fifo_size)
- spi_writel(as, CR, SPI_BIT(FIFOEN));
-
- if (as->caps.has_wdrbt) {
- spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
- | SPI_BIT(MSTR));
- } else {
- spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
- }
-
- if (as->use_pdc)
- spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
- spi_writel(as, CR, SPI_BIT(SPIEN));
-}
-
-static int atmel_spi_probe(struct platform_device *pdev)
-{
- struct resource *regs;
- int irq;
- struct clk *clk;
- int ret;
- struct spi_master *master;
- struct atmel_spi *as;
-
- /* Select default pin state */
- pinctrl_pm_select_default_state(&pdev->dev);
-
- regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!regs)
- return -ENXIO;
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return irq;
-
- clk = devm_clk_get(&pdev->dev, "spi_clk");
- if (IS_ERR(clk))
- return PTR_ERR(clk);
-
- /* setup spi core then atmel-specific driver state */
- ret = -ENOMEM;
- master = spi_alloc_master(&pdev->dev, sizeof(*as));
- if (!master)
- goto out_free;
-
- /* the spi->mode bits understood by this driver: */
- master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
- master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 16);
- master->dev.of_node = pdev->dev.of_node;
- master->bus_num = pdev->id;
- master->num_chipselect = master->dev.of_node ? 0 : 4;
- master->setup = atmel_spi_setup;
- master->flags = (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX);
- master->transfer_one_message = atmel_spi_transfer_one_message;
- master->cleanup = atmel_spi_cleanup;
- master->auto_runtime_pm = true;
- master->max_dma_len = SPI_MAX_DMA_XFER;
- master->can_dma = atmel_spi_can_dma;
- platform_set_drvdata(pdev, master);
-
- as = spi_master_get_devdata(master);
-
- spin_lock_init(&as->lock);
-
- as->pdev = pdev;
- as->regs = devm_ioremap_resource(&pdev->dev, regs);
- if (IS_ERR(as->regs)) {
- ret = PTR_ERR(as->regs);
- goto out_unmap_regs;
- }
- as->phybase = regs->start;
- as->irq = irq;
- as->clk = clk;
-
- init_completion(&as->xfer_completion);
-
- atmel_get_caps(as);
-
- as->use_cs_gpios = true;
- if (atmel_spi_is_v2(as) &&
- pdev->dev.of_node &&
- !of_get_property(pdev->dev.of_node, "cs-gpios", NULL)) {
- as->use_cs_gpios = false;
- master->num_chipselect = 4;
- }
-
- ret = atmel_spi_gpio_cs(pdev);
- if (ret)
- goto out_unmap_regs;
-
- as->use_dma = false;
- as->use_pdc = false;
- if (as->caps.has_dma_support) {
- ret = atmel_spi_configure_dma(master, as);
- if (ret == 0) {
- as->use_dma = true;
- } else if (ret == -EPROBE_DEFER) {
- return ret;
- }
- } else if (as->caps.has_pdc_support) {
- as->use_pdc = true;
- }
-
- if (IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) {
- as->addr_rx_bbuf = dma_alloc_coherent(&pdev->dev,
- SPI_MAX_DMA_XFER,
- &as->dma_addr_rx_bbuf,
- GFP_KERNEL | GFP_DMA);
- if (!as->addr_rx_bbuf) {
- as->use_dma = false;
- } else {
- as->addr_tx_bbuf = dma_alloc_coherent(&pdev->dev,
- SPI_MAX_DMA_XFER,
- &as->dma_addr_tx_bbuf,
- GFP_KERNEL | GFP_DMA);
- if (!as->addr_tx_bbuf) {
- as->use_dma = false;
- dma_free_coherent(&pdev->dev, SPI_MAX_DMA_XFER,
- as->addr_rx_bbuf,
- as->dma_addr_rx_bbuf);
- }
- }
- if (!as->use_dma)
- dev_info(master->dev.parent,
- " can not allocate dma coherent memory\n");
- }
-
- if (as->caps.has_dma_support && !as->use_dma)
- dev_info(&pdev->dev, "Atmel SPI Controller using PIO only\n");
-
- if (as->use_pdc) {
- ret = devm_request_irq(&pdev->dev, irq, atmel_spi_pdc_interrupt,
- 0, dev_name(&pdev->dev), master);
- } else {
- ret = devm_request_irq(&pdev->dev, irq, atmel_spi_pio_interrupt,
- 0, dev_name(&pdev->dev), master);
- }
- if (ret)
- goto out_unmap_regs;
-
- /* Initialize the hardware */
- ret = clk_prepare_enable(clk);
- if (ret)
- goto out_free_irq;
-
- as->spi_clk = clk_get_rate(clk);
-
- as->fifo_size = 0;
- if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
- &as->fifo_size)) {
- dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size);
- }
-
- atmel_spi_init(as);
-
- pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
- pm_runtime_use_autosuspend(&pdev->dev);
- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
-
- ret = devm_spi_register_master(&pdev->dev, master);
- if (ret)
- goto out_free_dma;
-
- /* go! */
- dev_info(&pdev->dev, "Atmel SPI Controller version 0x%x at 0x%08lx (irq %d)\n",
- atmel_get_version(as), (unsigned long)regs->start,
- irq);
-
- return 0;
-
-out_free_dma:
- pm_runtime_disable(&pdev->dev);
- pm_runtime_set_suspended(&pdev->dev);
-
- if (as->use_dma)
- atmel_spi_release_dma(master);
-
- spi_writel(as, CR, SPI_BIT(SWRST));
- spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
- clk_disable_unprepare(clk);
-out_free_irq:
-out_unmap_regs:
-out_free:
- spi_master_put(master);
- return ret;
-}
-
-static int atmel_spi_remove(struct platform_device *pdev)
-{
- struct spi_master *master = platform_get_drvdata(pdev);
- struct atmel_spi *as = spi_master_get_devdata(master);
-
- pm_runtime_get_sync(&pdev->dev);
-
- /* reset the hardware and block queue progress */
- if (as->use_dma) {
- atmel_spi_stop_dma(master);
- atmel_spi_release_dma(master);
- if (IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) {
- dma_free_coherent(&pdev->dev, SPI_MAX_DMA_XFER,
- as->addr_tx_bbuf,
- as->dma_addr_tx_bbuf);
- dma_free_coherent(&pdev->dev, SPI_MAX_DMA_XFER,
- as->addr_rx_bbuf,
- as->dma_addr_rx_bbuf);
- }
- }
-
- spin_lock_irq(&as->lock);
- spi_writel(as, CR, SPI_BIT(SWRST));
- spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
- spi_readl(as, SR);
- spin_unlock_irq(&as->lock);
-
- clk_disable_unprepare(as->clk);
-
- pm_runtime_put_noidle(&pdev->dev);
- pm_runtime_disable(&pdev->dev);
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int atmel_spi_runtime_suspend(struct device *dev)
-{
- struct spi_master *master = dev_get_drvdata(dev);
- struct atmel_spi *as = spi_master_get_devdata(master);
-
- clk_disable_unprepare(as->clk);
- pinctrl_pm_select_sleep_state(dev);
-
- return 0;
-}
-
-static int atmel_spi_runtime_resume(struct device *dev)
-{
- struct spi_master *master = dev_get_drvdata(dev);
- struct atmel_spi *as = spi_master_get_devdata(master);
-
- pinctrl_pm_select_default_state(dev);
-
- return clk_prepare_enable(as->clk);
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int atmel_spi_suspend(struct device *dev)
-{
- struct spi_master *master = dev_get_drvdata(dev);
- int ret;
-
- /* Stop the queue running */
- ret = spi_master_suspend(master);
- if (ret) {
- dev_warn(dev, "cannot suspend master\n");
- return ret;
- }
-
- if (!pm_runtime_suspended(dev))
- atmel_spi_runtime_suspend(dev);
-
- return 0;
-}
-
-static int atmel_spi_resume(struct device *dev)
-{
- struct spi_master *master = dev_get_drvdata(dev);
- struct atmel_spi *as = spi_master_get_devdata(master);
- int ret;
-
- ret = clk_prepare_enable(as->clk);
- if (ret)
- return ret;
-
- atmel_spi_init(as);
-
- clk_disable_unprepare(as->clk);
-
- if (!pm_runtime_suspended(dev)) {
- ret = atmel_spi_runtime_resume(dev);
- if (ret)
- return ret;
- }
-
- /* Start the queue running */
- ret = spi_master_resume(master);
- if (ret)
- dev_err(dev, "problem starting queue (%d)\n", ret);
-
- return ret;
-}
-#endif
-
-static const struct dev_pm_ops atmel_spi_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(atmel_spi_suspend, atmel_spi_resume)
- SET_RUNTIME_PM_OPS(atmel_spi_runtime_suspend,
- atmel_spi_runtime_resume, NULL)
-};
-#define ATMEL_SPI_PM_OPS (&atmel_spi_pm_ops)
-#else
-#define ATMEL_SPI_PM_OPS NULL
-#endif
-
-#if defined(CONFIG_OF)
-static const struct of_device_id atmel_spi_dt_ids[] = {
- { .compatible = "atmel,at91rm9200-spi" },
- { /* sentinel */ }
-};
-
-MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids);
-#endif
-
-static struct platform_driver atmel_spi_driver = {
- .driver = {
- .name = "atmel_spi",
- .pm = ATMEL_SPI_PM_OPS,
- .of_match_table = of_match_ptr(atmel_spi_dt_ids),
- },
- .probe = atmel_spi_probe,
- .remove = atmel_spi_remove,
-};
-module_platform_driver(atmel_spi_driver);
-
-MODULE_DESCRIPTION("Atmel AT32/AT91 SPI Controller driver");
-MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:atmel_spi");
--
2.17.1
[PATCH] spi: Delete Atmel AT91 SPI driver
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
- Subject: [PATCH] spi: Delete Atmel AT91 SPI driver
- From: Linus Walleij <linus.walleij@xxxxxxxxxx>
- Date: Tue, 4 Sep 2018 11:49:22 +0200
- Follow-Ups:
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