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Date: Thu, 21 Jan 2021 10:19:13 +1300
From: Barry Song <baohua@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] spi: remove sirf prima/atlas driver
Arnd Bergmann <arnd@...nel.org> 于2021年1月21日周四 上午5:17写道：
>
> From: Arnd Bergmann <arnd@...db.de>
>
> The CSR SiRF prima2/atlas platforms are getting removed, so this driver
> is no longer needed.
>
> Cc: Barry Song <baohua@...nel.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Barry Song <baohua@...nel.org>
> ---
> .../devicetree/bindings/spi/spi-sirf.txt | 42 -
> drivers/spi/Kconfig | 7 -
> drivers/spi/Makefile | 1 -
> drivers/spi/spi-sirf.c | 1236 -----------------
> 4 files changed, 1286 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/spi/spi-sirf.txt
> delete mode 100644 drivers/spi/spi-sirf.c
>
> diff --git a/Documentation/devicetree/bindings/spi/spi-sirf.txt b/Documentation/devicetree/bindings/spi/spi-sirf.txt
> deleted file mode 100644
> index ddd78ff68fae..000000000000
> --- a/Documentation/devicetree/bindings/spi/spi-sirf.txt
> +++ /dev/null
> @@ -1,42 +0,0 @@
> -* CSR SiRFprimaII Serial Peripheral Interface
> -
> -Required properties:
> -- compatible : Should be "sirf,prima2-spi", "sirf,prima2-usp"
> - or "sirf,atlas7-usp"
> -- reg : Offset and length of the register set for the device
> -- interrupts : Should contain SPI interrupt
> -- resets: phandle to the reset controller asserting this device in
> - reset
> - See ../reset/reset.txt for details.
> -- dmas : Must contain an entry for each entry in clock-names.
> - See ../dma/dma.txt for details.
> -- dma-names : Must include the following entries:
> - - rx
> - - tx
> -- clocks : Must contain an entry for each entry in clock-names.
> - See ../clocks/clock-bindings.txt for details.
> -
> -- #address-cells: Number of cells required to define a chip select
> - address on the SPI bus. Should be set to 1.
> -- #size-cells: Should be zero.
> -
> -Optional properties:
> -- spi-max-frequency: Specifies maximum SPI clock frequency,
> - Units - Hz. Definition as per
> - Documentation/devicetree/bindings/spi/spi-bus.txt
> -- cs-gpios: should specify GPIOs used for chipselects.
> -
> -Example:
> -
> -spi0: spi@...d0000 {
> - compatible = "sirf,prima2-spi";
> - reg = <0xb00d0000 0x10000>;
> - interrupts = <15>;
> - dmas = <&dmac1 9>,
> - <&dmac1 4>;
> - dma-names = "rx", "tx";
> - #address-cells = <1>;
> - #size-cells = <0>;
> - clocks = <&clks 19>;
> - resets = <&rstc 26>;
> -};
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index 74ea73a05981..855a1ee1c04c 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -750,13 +750,6 @@ config SPI_SIFIVE
> help
> This exposes the SPI controller IP from SiFive.
>
> -config SPI_SIRF
> - tristate "CSR SiRFprimaII SPI controller"
> - depends on SIRF_DMA
> - select SPI_BITBANG
> - help
> - SPI driver for CSR SiRFprimaII SoCs
> -
> config SPI_SLAVE_MT27XX
> tristate "MediaTek SPI slave device"
> depends on ARCH_MEDIATEK || COMPILE_TEST
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index 6fea5821662e..6c79b83d5f4a 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -105,7 +105,6 @@ obj-$(CONFIG_SPI_SH_HSPI) += spi-sh-hspi.o
> obj-$(CONFIG_SPI_SH_MSIOF) += spi-sh-msiof.o
> obj-$(CONFIG_SPI_SH_SCI) += spi-sh-sci.o
> obj-$(CONFIG_SPI_SIFIVE) += spi-sifive.o
> -obj-$(CONFIG_SPI_SIRF) += spi-sirf.o
> obj-$(CONFIG_SPI_SLAVE_MT27XX) += spi-slave-mt27xx.o
> obj-$(CONFIG_SPI_SPRD) += spi-sprd.o
> obj-$(CONFIG_SPI_SPRD_ADI) += spi-sprd-adi.o
> diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c
> deleted file mode 100644
> index 8419e6722e17..000000000000
> --- a/drivers/spi/spi-sirf.c
> +++ /dev/null
> @@ -1,1236 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-or-later
> -/*
> - * SPI bus driver for CSR SiRFprimaII
> - *
> - * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
> - */
> -
> -#include <linux/module.h>
> -#include <linux/kernel.h>
> -#include <linux/slab.h>
> -#include <linux/clk.h>
> -#include <linux/completion.h>
> -#include <linux/interrupt.h>
> -#include <linux/io.h>
> -#include <linux/of.h>
> -#include <linux/bitops.h>
> -#include <linux/err.h>
> -#include <linux/platform_device.h>
> -#include <linux/of_gpio.h>
> -#include <linux/spi/spi.h>
> -#include <linux/spi/spi_bitbang.h>
> -#include <linux/dmaengine.h>
> -#include <linux/dma-direction.h>
> -#include <linux/dma-mapping.h>
> -#include <linux/reset.h>
> -
> -#define DRIVER_NAME "sirfsoc_spi"
> -/* SPI CTRL register defines */
> -#define SIRFSOC_SPI_SLV_MODE BIT(16)
> -#define SIRFSOC_SPI_CMD_MODE BIT(17)
> -#define SIRFSOC_SPI_CS_IO_OUT BIT(18)
> -#define SIRFSOC_SPI_CS_IO_MODE BIT(19)
> -#define SIRFSOC_SPI_CLK_IDLE_STAT BIT(20)
> -#define SIRFSOC_SPI_CS_IDLE_STAT BIT(21)
> -#define SIRFSOC_SPI_TRAN_MSB BIT(22)
> -#define SIRFSOC_SPI_DRV_POS_EDGE BIT(23)
> -#define SIRFSOC_SPI_CS_HOLD_TIME BIT(24)
> -#define SIRFSOC_SPI_CLK_SAMPLE_MODE BIT(25)
> -#define SIRFSOC_SPI_TRAN_DAT_FORMAT_8 (0 << 26)
> -#define SIRFSOC_SPI_TRAN_DAT_FORMAT_12 (1 << 26)
> -#define SIRFSOC_SPI_TRAN_DAT_FORMAT_16 (2 << 26)
> -#define SIRFSOC_SPI_TRAN_DAT_FORMAT_32 (3 << 26)
> -#define SIRFSOC_SPI_CMD_BYTE_NUM(x) ((x & 3) << 28)
> -#define SIRFSOC_SPI_ENA_AUTO_CLR BIT(30)
> -#define SIRFSOC_SPI_MUL_DAT_MODE BIT(31)
> -
> -/* Interrupt Enable */
> -#define SIRFSOC_SPI_RX_DONE_INT_EN BIT(0)
> -#define SIRFSOC_SPI_TX_DONE_INT_EN BIT(1)
> -#define SIRFSOC_SPI_RX_OFLOW_INT_EN BIT(2)
> -#define SIRFSOC_SPI_TX_UFLOW_INT_EN BIT(3)
> -#define SIRFSOC_SPI_RX_IO_DMA_INT_EN BIT(4)
> -#define SIRFSOC_SPI_TX_IO_DMA_INT_EN BIT(5)
> -#define SIRFSOC_SPI_RXFIFO_FULL_INT_EN BIT(6)
> -#define SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN BIT(7)
> -#define SIRFSOC_SPI_RXFIFO_THD_INT_EN BIT(8)
> -#define SIRFSOC_SPI_TXFIFO_THD_INT_EN BIT(9)
> -#define SIRFSOC_SPI_FRM_END_INT_EN BIT(10)
> -
> -/* Interrupt status */
> -#define SIRFSOC_SPI_RX_DONE BIT(0)
> -#define SIRFSOC_SPI_TX_DONE BIT(1)
> -#define SIRFSOC_SPI_RX_OFLOW BIT(2)
> -#define SIRFSOC_SPI_TX_UFLOW BIT(3)
> -#define SIRFSOC_SPI_RX_IO_DMA BIT(4)
> -#define SIRFSOC_SPI_RX_FIFO_FULL BIT(6)
> -#define SIRFSOC_SPI_TXFIFO_EMPTY BIT(7)
> -#define SIRFSOC_SPI_RXFIFO_THD_REACH BIT(8)
> -#define SIRFSOC_SPI_TXFIFO_THD_REACH BIT(9)
> -#define SIRFSOC_SPI_FRM_END BIT(10)
> -
> -/* TX RX enable */
> -#define SIRFSOC_SPI_RX_EN BIT(0)
> -#define SIRFSOC_SPI_TX_EN BIT(1)
> -#define SIRFSOC_SPI_CMD_TX_EN BIT(2)
> -
> -#define SIRFSOC_SPI_IO_MODE_SEL BIT(0)
> -#define SIRFSOC_SPI_RX_DMA_FLUSH BIT(2)
> -
> -/* FIFO OPs */
> -#define SIRFSOC_SPI_FIFO_RESET BIT(0)
> -#define SIRFSOC_SPI_FIFO_START BIT(1)
> -
> -/* FIFO CTRL */
> -#define SIRFSOC_SPI_FIFO_WIDTH_BYTE (0 << 0)
> -#define SIRFSOC_SPI_FIFO_WIDTH_WORD (1 << 0)
> -#define SIRFSOC_SPI_FIFO_WIDTH_DWORD (2 << 0)
> -/* USP related */
> -#define SIRFSOC_USP_SYNC_MODE BIT(0)
> -#define SIRFSOC_USP_SLV_MODE BIT(1)
> -#define SIRFSOC_USP_LSB BIT(4)
> -#define SIRFSOC_USP_EN BIT(5)
> -#define SIRFSOC_USP_RXD_FALLING_EDGE BIT(6)
> -#define SIRFSOC_USP_TXD_FALLING_EDGE BIT(7)
> -#define SIRFSOC_USP_CS_HIGH_VALID BIT(9)
> -#define SIRFSOC_USP_SCLK_IDLE_STAT BIT(11)
> -#define SIRFSOC_USP_TFS_IO_MODE BIT(14)
> -#define SIRFSOC_USP_TFS_IO_INPUT BIT(19)
> -
> -#define SIRFSOC_USP_RXD_DELAY_LEN_MASK 0xFF
> -#define SIRFSOC_USP_TXD_DELAY_LEN_MASK 0xFF
> -#define SIRFSOC_USP_RXD_DELAY_OFFSET 0
> -#define SIRFSOC_USP_TXD_DELAY_OFFSET 8
> -#define SIRFSOC_USP_RXD_DELAY_LEN 1
> -#define SIRFSOC_USP_TXD_DELAY_LEN 1
> -#define SIRFSOC_USP_CLK_DIVISOR_OFFSET 21
> -#define SIRFSOC_USP_CLK_DIVISOR_MASK 0x3FF
> -#define SIRFSOC_USP_CLK_10_11_MASK 0x3
> -#define SIRFSOC_USP_CLK_10_11_OFFSET 30
> -#define SIRFSOC_USP_CLK_12_15_MASK 0xF
> -#define SIRFSOC_USP_CLK_12_15_OFFSET 24
> -
> -#define SIRFSOC_USP_TX_DATA_OFFSET 0
> -#define SIRFSOC_USP_TX_SYNC_OFFSET 8
> -#define SIRFSOC_USP_TX_FRAME_OFFSET 16
> -#define SIRFSOC_USP_TX_SHIFTER_OFFSET 24
> -
> -#define SIRFSOC_USP_TX_DATA_MASK 0xFF
> -#define SIRFSOC_USP_TX_SYNC_MASK 0xFF
> -#define SIRFSOC_USP_TX_FRAME_MASK 0xFF
> -#define SIRFSOC_USP_TX_SHIFTER_MASK 0x1F
> -
> -#define SIRFSOC_USP_RX_DATA_OFFSET 0
> -#define SIRFSOC_USP_RX_FRAME_OFFSET 8
> -#define SIRFSOC_USP_RX_SHIFTER_OFFSET 16
> -
> -#define SIRFSOC_USP_RX_DATA_MASK 0xFF
> -#define SIRFSOC_USP_RX_FRAME_MASK 0xFF
> -#define SIRFSOC_USP_RX_SHIFTER_MASK 0x1F
> -#define SIRFSOC_USP_CS_HIGH_VALUE BIT(1)
> -
> -#define SIRFSOC_SPI_FIFO_SC_OFFSET 0
> -#define SIRFSOC_SPI_FIFO_LC_OFFSET 10
> -#define SIRFSOC_SPI_FIFO_HC_OFFSET 20
> -
> -#define SIRFSOC_SPI_FIFO_FULL_MASK(s) (1 << ((s)->fifo_full_offset))
> -#define SIRFSOC_SPI_FIFO_EMPTY_MASK(s) (1 << ((s)->fifo_full_offset + 1))
> -#define SIRFSOC_SPI_FIFO_THD_MASK(s) ((s)->fifo_size - 1)
> -#define SIRFSOC_SPI_FIFO_THD_OFFSET 2
> -#define SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(s, val) \
> - ((val) & (s)->fifo_level_chk_mask)
> -
> -enum sirf_spi_type {
> - SIRF_REAL_SPI,
> - SIRF_USP_SPI_P2,
> - SIRF_USP_SPI_A7,
> -};
> -
> -/*
> - * only if the rx/tx buffer and transfer size are 4-bytes aligned, we use dma
> - * due to the limitation of dma controller
> - */
> -
> -#define ALIGNED(x) (!((u32)x & 0x3))
> -#define IS_DMA_VALID(x) (x && ALIGNED(x->tx_buf) && ALIGNED(x->rx_buf) && \
> - ALIGNED(x->len) && (x->len < 2 * PAGE_SIZE))
> -
> -#define SIRFSOC_MAX_CMD_BYTES 4
> -#define SIRFSOC_SPI_DEFAULT_FRQ 1000000
> -
> -struct sirf_spi_register {
> - /*SPI and USP-SPI common*/
> - u32 tx_rx_en;
> - u32 int_en;
> - u32 int_st;
> - u32 tx_dma_io_ctrl;
> - u32 tx_dma_io_len;
> - u32 txfifo_ctrl;
> - u32 txfifo_level_chk;
> - u32 txfifo_op;
> - u32 txfifo_st;
> - u32 txfifo_data;
> - u32 rx_dma_io_ctrl;
> - u32 rx_dma_io_len;
> - u32 rxfifo_ctrl;
> - u32 rxfifo_level_chk;
> - u32 rxfifo_op;
> - u32 rxfifo_st;
> - u32 rxfifo_data;
> - /*SPI self*/
> - u32 spi_ctrl;
> - u32 spi_cmd;
> - u32 spi_dummy_delay_ctrl;
> - /*USP-SPI self*/
> - u32 usp_mode1;
> - u32 usp_mode2;
> - u32 usp_tx_frame_ctrl;
> - u32 usp_rx_frame_ctrl;
> - u32 usp_pin_io_data;
> - u32 usp_risc_dsp_mode;
> - u32 usp_async_param_reg;
> - u32 usp_irda_x_mode_div;
> - u32 usp_sm_cfg;
> - u32 usp_int_en_clr;
> -};
> -
> -static const struct sirf_spi_register real_spi_register = {
> - .tx_rx_en = 0x8,
> - .int_en = 0xc,
> - .int_st = 0x10,
> - .tx_dma_io_ctrl = 0x100,
> - .tx_dma_io_len = 0x104,
> - .txfifo_ctrl = 0x108,
> - .txfifo_level_chk = 0x10c,
> - .txfifo_op = 0x110,
> - .txfifo_st = 0x114,
> - .txfifo_data = 0x118,
> - .rx_dma_io_ctrl = 0x120,
> - .rx_dma_io_len = 0x124,
> - .rxfifo_ctrl = 0x128,
> - .rxfifo_level_chk = 0x12c,
> - .rxfifo_op = 0x130,
> - .rxfifo_st = 0x134,
> - .rxfifo_data = 0x138,
> - .spi_ctrl = 0x0,
> - .spi_cmd = 0x4,
> - .spi_dummy_delay_ctrl = 0x144,
> -};
> -
> -static const struct sirf_spi_register usp_spi_register = {
> - .tx_rx_en = 0x10,
> - .int_en = 0x14,
> - .int_st = 0x18,
> - .tx_dma_io_ctrl = 0x100,
> - .tx_dma_io_len = 0x104,
> - .txfifo_ctrl = 0x108,
> - .txfifo_level_chk = 0x10c,
> - .txfifo_op = 0x110,
> - .txfifo_st = 0x114,
> - .txfifo_data = 0x118,
> - .rx_dma_io_ctrl = 0x120,
> - .rx_dma_io_len = 0x124,
> - .rxfifo_ctrl = 0x128,
> - .rxfifo_level_chk = 0x12c,
> - .rxfifo_op = 0x130,
> - .rxfifo_st = 0x134,
> - .rxfifo_data = 0x138,
> - .usp_mode1 = 0x0,
> - .usp_mode2 = 0x4,
> - .usp_tx_frame_ctrl = 0x8,
> - .usp_rx_frame_ctrl = 0xc,
> - .usp_pin_io_data = 0x1c,
> - .usp_risc_dsp_mode = 0x20,
> - .usp_async_param_reg = 0x24,
> - .usp_irda_x_mode_div = 0x28,
> - .usp_sm_cfg = 0x2c,
> - .usp_int_en_clr = 0x140,
> -};
> -
> -struct sirfsoc_spi {
> - struct spi_bitbang bitbang;
> - struct completion rx_done;
> - struct completion tx_done;
> -
> - void __iomem *base;
> - u32 ctrl_freq; /* SPI controller clock speed */
> - struct clk *clk;
> -
> - /* rx & tx bufs from the spi_transfer */
> - const void *tx;
> - void *rx;
> -
> - /* place received word into rx buffer */
> - void (*rx_word) (struct sirfsoc_spi *);
> - /* get word from tx buffer for sending */
> - void (*tx_word) (struct sirfsoc_spi *);
> -
> - /* number of words left to be tranmitted/received */
> - unsigned int left_tx_word;
> - unsigned int left_rx_word;
> -
> - /* rx & tx DMA channels */
> - struct dma_chan *rx_chan;
> - struct dma_chan *tx_chan;
> - dma_addr_t src_start;
> - dma_addr_t dst_start;
> - int word_width; /* in bytes */
> -
> - /*
> - * if tx size is not more than 4 and rx size is NULL, use
> - * command model
> - */
> - bool tx_by_cmd;
> - bool hw_cs;
> - enum sirf_spi_type type;
> - const struct sirf_spi_register *regs;
> - unsigned int fifo_size;
> - /* fifo empty offset is (fifo full offset + 1)*/
> - unsigned int fifo_full_offset;
> - /* fifo_level_chk_mask is (fifo_size/4 - 1) */
> - unsigned int fifo_level_chk_mask;
> - unsigned int dat_max_frm_len;
> -};
> -
> -struct sirf_spi_comp_data {
> - const struct sirf_spi_register *regs;
> - enum sirf_spi_type type;
> - unsigned int dat_max_frm_len;
> - unsigned int fifo_size;
> - void (*hwinit)(struct sirfsoc_spi *sspi);
> -};
> -
> -static void sirfsoc_usp_hwinit(struct sirfsoc_spi *sspi)
> -{
> - /* reset USP and let USP can operate */
> - writel(readl(sspi->base + sspi->regs->usp_mode1) &
> - ~SIRFSOC_USP_EN, sspi->base + sspi->regs->usp_mode1);
> - writel(readl(sspi->base + sspi->regs->usp_mode1) |
> - SIRFSOC_USP_EN, sspi->base + sspi->regs->usp_mode1);
> -}
> -
> -static void spi_sirfsoc_rx_word_u8(struct sirfsoc_spi *sspi)
> -{
> - u32 data;
> - u8 *rx = sspi->rx;
> -
> - data = readl(sspi->base + sspi->regs->rxfifo_data);
> -
> - if (rx) {
> - *rx++ = (u8) data;
> - sspi->rx = rx;
> - }
> -
> - sspi->left_rx_word--;
> -}
> -
> -static void spi_sirfsoc_tx_word_u8(struct sirfsoc_spi *sspi)
> -{
> - u32 data = 0;
> - const u8 *tx = sspi->tx;
> -
> - if (tx) {
> - data = *tx++;
> - sspi->tx = tx;
> - }
> - writel(data, sspi->base + sspi->regs->txfifo_data);
> - sspi->left_tx_word--;
> -}
> -
> -static void spi_sirfsoc_rx_word_u16(struct sirfsoc_spi *sspi)
> -{
> - u32 data;
> - u16 *rx = sspi->rx;
> -
> - data = readl(sspi->base + sspi->regs->rxfifo_data);
> -
> - if (rx) {
> - *rx++ = (u16) data;
> - sspi->rx = rx;
> - }
> -
> - sspi->left_rx_word--;
> -}
> -
> -static void spi_sirfsoc_tx_word_u16(struct sirfsoc_spi *sspi)
> -{
> - u32 data = 0;
> - const u16 *tx = sspi->tx;
> -
> - if (tx) {
> - data = *tx++;
> - sspi->tx = tx;
> - }
> -
> - writel(data, sspi->base + sspi->regs->txfifo_data);
> - sspi->left_tx_word--;
> -}
> -
> -static void spi_sirfsoc_rx_word_u32(struct sirfsoc_spi *sspi)
> -{
> - u32 data;
> - u32 *rx = sspi->rx;
> -
> - data = readl(sspi->base + sspi->regs->rxfifo_data);
> -
> - if (rx) {
> - *rx++ = (u32) data;
> - sspi->rx = rx;
> - }
> -
> - sspi->left_rx_word--;
> -
> -}
> -
> -static void spi_sirfsoc_tx_word_u32(struct sirfsoc_spi *sspi)
> -{
> - u32 data = 0;
> - const u32 *tx = sspi->tx;
> -
> - if (tx) {
> - data = *tx++;
> - sspi->tx = tx;
> - }
> -
> - writel(data, sspi->base + sspi->regs->txfifo_data);
> - sspi->left_tx_word--;
> -}
> -
> -static irqreturn_t spi_sirfsoc_irq(int irq, void *dev_id)
> -{
> - struct sirfsoc_spi *sspi = dev_id;
> - u32 spi_stat;
> -
> - spi_stat = readl(sspi->base + sspi->regs->int_st);
> - if (sspi->tx_by_cmd && sspi->type == SIRF_REAL_SPI
> - && (spi_stat & SIRFSOC_SPI_FRM_END)) {
> - complete(&sspi->tx_done);
> - writel(0x0, sspi->base + sspi->regs->int_en);
> - writel(readl(sspi->base + sspi->regs->int_st),
> - sspi->base + sspi->regs->int_st);
> - return IRQ_HANDLED;
> - }
> - /* Error Conditions */
> - if (spi_stat & SIRFSOC_SPI_RX_OFLOW ||
> - spi_stat & SIRFSOC_SPI_TX_UFLOW) {
> - complete(&sspi->tx_done);
> - complete(&sspi->rx_done);
> - switch (sspi->type) {
> - case SIRF_REAL_SPI:
> - case SIRF_USP_SPI_P2:
> - writel(0x0, sspi->base + sspi->regs->int_en);
> - break;
> - case SIRF_USP_SPI_A7:
> - writel(~0UL, sspi->base + sspi->regs->usp_int_en_clr);
> - break;
> - }
> - writel(readl(sspi->base + sspi->regs->int_st),
> - sspi->base + sspi->regs->int_st);
> - return IRQ_HANDLED;
> - }
> - if (spi_stat & SIRFSOC_SPI_TXFIFO_EMPTY)
> - complete(&sspi->tx_done);
> - while (!(readl(sspi->base + sspi->regs->int_st) &
> - SIRFSOC_SPI_RX_IO_DMA))
> - cpu_relax();
> - complete(&sspi->rx_done);
> - switch (sspi->type) {
> - case SIRF_REAL_SPI:
> - case SIRF_USP_SPI_P2:
> - writel(0x0, sspi->base + sspi->regs->int_en);
> - break;
> - case SIRF_USP_SPI_A7:
> - writel(~0UL, sspi->base + sspi->regs->usp_int_en_clr);
> - break;
> - }
> - writel(readl(sspi->base + sspi->regs->int_st),
> - sspi->base + sspi->regs->int_st);
> -
> - return IRQ_HANDLED;
> -}
> -
> -static void spi_sirfsoc_dma_fini_callback(void *data)
> -{
> - struct completion *dma_complete = data;
> -
> - complete(dma_complete);
> -}
> -
> -static void spi_sirfsoc_cmd_transfer(struct spi_device *spi,
> - struct spi_transfer *t)
> -{
> - struct sirfsoc_spi *sspi;
> - int timeout = t->len * 10;
> - u32 cmd;
> -
> - sspi = spi_master_get_devdata(spi->master);
> - writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->txfifo_op);
> - writel(SIRFSOC_SPI_FIFO_START, sspi->base + sspi->regs->txfifo_op);
> - memcpy(&cmd, sspi->tx, t->len);
> - if (sspi->word_width == 1 && !(spi->mode & SPI_LSB_FIRST))
> - cmd = cpu_to_be32(cmd) >>
> - ((SIRFSOC_MAX_CMD_BYTES - t->len) * 8);
> - if (sspi->word_width == 2 && t->len == 4 &&
> - (!(spi->mode & SPI_LSB_FIRST)))
> - cmd = ((cmd & 0xffff) << 16) | (cmd >> 16);
> - writel(cmd, sspi->base + sspi->regs->spi_cmd);
> - writel(SIRFSOC_SPI_FRM_END_INT_EN,
> - sspi->base + sspi->regs->int_en);
> - writel(SIRFSOC_SPI_CMD_TX_EN,
> - sspi->base + sspi->regs->tx_rx_en);
> - if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) {
> - dev_err(&spi->dev, "cmd transfer timeout\n");
> - return;
> - }
> - sspi->left_rx_word -= t->len;
> -}
> -
> -static void spi_sirfsoc_dma_transfer(struct spi_device *spi,
> - struct spi_transfer *t)
> -{
> - struct sirfsoc_spi *sspi;
> - struct dma_async_tx_descriptor *rx_desc, *tx_desc;
> - int timeout = t->len * 10;
> -
> - sspi = spi_master_get_devdata(spi->master);
> - writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->rxfifo_op);
> - writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->txfifo_op);
> - switch (sspi->type) {
> - case SIRF_REAL_SPI:
> - writel(SIRFSOC_SPI_FIFO_START,
> - sspi->base + sspi->regs->rxfifo_op);
> - writel(SIRFSOC_SPI_FIFO_START,
> - sspi->base + sspi->regs->txfifo_op);
> - writel(0, sspi->base + sspi->regs->int_en);
> - break;
> - case SIRF_USP_SPI_P2:
> - writel(0x0, sspi->base + sspi->regs->rxfifo_op);
> - writel(0x0, sspi->base + sspi->regs->txfifo_op);
> - writel(0, sspi->base + sspi->regs->int_en);
> - break;
> - case SIRF_USP_SPI_A7:
> - writel(0x0, sspi->base + sspi->regs->rxfifo_op);
> - writel(0x0, sspi->base + sspi->regs->txfifo_op);
> - writel(~0UL, sspi->base + sspi->regs->usp_int_en_clr);
> - break;
> - }
> - writel(readl(sspi->base + sspi->regs->int_st),
> - sspi->base + sspi->regs->int_st);
> - if (sspi->left_tx_word < sspi->dat_max_frm_len) {
> - switch (sspi->type) {
> - case SIRF_REAL_SPI:
> - writel(readl(sspi->base + sspi->regs->spi_ctrl) |
> - SIRFSOC_SPI_ENA_AUTO_CLR |
> - SIRFSOC_SPI_MUL_DAT_MODE,
> - sspi->base + sspi->regs->spi_ctrl);
> - writel(sspi->left_tx_word - 1,
> - sspi->base + sspi->regs->tx_dma_io_len);
> - writel(sspi->left_tx_word - 1,
> - sspi->base + sspi->regs->rx_dma_io_len);
> - break;
> - case SIRF_USP_SPI_P2:
> - case SIRF_USP_SPI_A7:
> - /*USP simulate SPI, tx/rx_dma_io_len indicates bytes*/
> - writel(sspi->left_tx_word * sspi->word_width,
> - sspi->base + sspi->regs->tx_dma_io_len);
> - writel(sspi->left_tx_word * sspi->word_width,
> - sspi->base + sspi->regs->rx_dma_io_len);
> - break;
> - }
> - } else {
> - if (sspi->type == SIRF_REAL_SPI)
> - writel(readl(sspi->base + sspi->regs->spi_ctrl),
> - sspi->base + sspi->regs->spi_ctrl);
> - writel(0, sspi->base + sspi->regs->tx_dma_io_len);
> - writel(0, sspi->base + sspi->regs->rx_dma_io_len);
> - }
> - sspi->dst_start = dma_map_single(&spi->dev, sspi->rx, t->len,
> - (t->tx_buf != t->rx_buf) ?
> - DMA_FROM_DEVICE : DMA_BIDIRECTIONAL);
> - rx_desc = dmaengine_prep_slave_single(sspi->rx_chan,
> - sspi->dst_start, t->len, DMA_DEV_TO_MEM,
> - DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
> - rx_desc->callback = spi_sirfsoc_dma_fini_callback;
> - rx_desc->callback_param = &sspi->rx_done;
> -
> - sspi->src_start = dma_map_single(&spi->dev, (void *)sspi->tx, t->len,
> - (t->tx_buf != t->rx_buf) ?
> - DMA_TO_DEVICE : DMA_BIDIRECTIONAL);
> - tx_desc = dmaengine_prep_slave_single(sspi->tx_chan,
> - sspi->src_start, t->len, DMA_MEM_TO_DEV,
> - DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
> - tx_desc->callback = spi_sirfsoc_dma_fini_callback;
> - tx_desc->callback_param = &sspi->tx_done;
> -
> - dmaengine_submit(tx_desc);
> - dmaengine_submit(rx_desc);
> - dma_async_issue_pending(sspi->tx_chan);
> - dma_async_issue_pending(sspi->rx_chan);
> - writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN,
> - sspi->base + sspi->regs->tx_rx_en);
> - if (sspi->type == SIRF_USP_SPI_P2 ||
> - sspi->type == SIRF_USP_SPI_A7) {
> - writel(SIRFSOC_SPI_FIFO_START,
> - sspi->base + sspi->regs->rxfifo_op);
> - writel(SIRFSOC_SPI_FIFO_START,
> - sspi->base + sspi->regs->txfifo_op);
> - }
> - if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0) {
> - dev_err(&spi->dev, "transfer timeout\n");
> - dmaengine_terminate_all(sspi->rx_chan);
> - } else
> - sspi->left_rx_word = 0;
> - /*
> - * we only wait tx-done event if transferring by DMA. for PIO,
> - * we get rx data by writing tx data, so if rx is done, tx has
> - * done earlier
> - */
> - if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) {
> - dev_err(&spi->dev, "transfer timeout\n");
> - if (sspi->type == SIRF_USP_SPI_P2 ||
> - sspi->type == SIRF_USP_SPI_A7)
> - writel(0, sspi->base + sspi->regs->tx_rx_en);
> - dmaengine_terminate_all(sspi->tx_chan);
> - }
> - dma_unmap_single(&spi->dev, sspi->src_start, t->len, DMA_TO_DEVICE);
> - dma_unmap_single(&spi->dev, sspi->dst_start, t->len, DMA_FROM_DEVICE);
> - /* TX, RX FIFO stop */
> - writel(0, sspi->base + sspi->regs->rxfifo_op);
> - writel(0, sspi->base + sspi->regs->txfifo_op);
> - if (sspi->left_tx_word >= sspi->dat_max_frm_len)
> - writel(0, sspi->base + sspi->regs->tx_rx_en);
> - if (sspi->type == SIRF_USP_SPI_P2 ||
> - sspi->type == SIRF_USP_SPI_A7)
> - writel(0, sspi->base + sspi->regs->tx_rx_en);
> -}
> -
> -static void spi_sirfsoc_pio_transfer(struct spi_device *spi,
> - struct spi_transfer *t)
> -{
> - struct sirfsoc_spi *sspi;
> - int timeout = t->len * 10;
> - unsigned int data_units;
> -
> - sspi = spi_master_get_devdata(spi->master);
> - do {
> - writel(SIRFSOC_SPI_FIFO_RESET,
> - sspi->base + sspi->regs->rxfifo_op);
> - writel(SIRFSOC_SPI_FIFO_RESET,
> - sspi->base + sspi->regs->txfifo_op);
> - switch (sspi->type) {
> - case SIRF_USP_SPI_P2:
> - writel(0x0, sspi->base + sspi->regs->rxfifo_op);
> - writel(0x0, sspi->base + sspi->regs->txfifo_op);
> - writel(0, sspi->base + sspi->regs->int_en);
> - writel(readl(sspi->base + sspi->regs->int_st),
> - sspi->base + sspi->regs->int_st);
> - writel(min((sspi->left_tx_word * sspi->word_width),
> - sspi->fifo_size),
> - sspi->base + sspi->regs->tx_dma_io_len);
> - writel(min((sspi->left_rx_word * sspi->word_width),
> - sspi->fifo_size),
> - sspi->base + sspi->regs->rx_dma_io_len);
> - break;
> - case SIRF_USP_SPI_A7:
> - writel(0x0, sspi->base + sspi->regs->rxfifo_op);
> - writel(0x0, sspi->base + sspi->regs->txfifo_op);
> - writel(~0UL, sspi->base + sspi->regs->usp_int_en_clr);
> - writel(readl(sspi->base + sspi->regs->int_st),
> - sspi->base + sspi->regs->int_st);
> - writel(min((sspi->left_tx_word * sspi->word_width),
> - sspi->fifo_size),
> - sspi->base + sspi->regs->tx_dma_io_len);
> - writel(min((sspi->left_rx_word * sspi->word_width),
> - sspi->fifo_size),
> - sspi->base + sspi->regs->rx_dma_io_len);
> - break;
> - case SIRF_REAL_SPI:
> - writel(SIRFSOC_SPI_FIFO_START,
> - sspi->base + sspi->regs->rxfifo_op);
> - writel(SIRFSOC_SPI_FIFO_START,
> - sspi->base + sspi->regs->txfifo_op);
> - writel(0, sspi->base + sspi->regs->int_en);
> - writel(readl(sspi->base + sspi->regs->int_st),
> - sspi->base + sspi->regs->int_st);
> - writel(readl(sspi->base + sspi->regs->spi_ctrl) |
> - SIRFSOC_SPI_MUL_DAT_MODE |
> - SIRFSOC_SPI_ENA_AUTO_CLR,
> - sspi->base + sspi->regs->spi_ctrl);
> - data_units = sspi->fifo_size / sspi->word_width;
> - writel(min(sspi->left_tx_word, data_units) - 1,
> - sspi->base + sspi->regs->tx_dma_io_len);
> - writel(min(sspi->left_rx_word, data_units) - 1,
> - sspi->base + sspi->regs->rx_dma_io_len);
> - break;
> - }
> - while (!((readl(sspi->base + sspi->regs->txfifo_st)
> - & SIRFSOC_SPI_FIFO_FULL_MASK(sspi))) &&
> - sspi->left_tx_word)
> - sspi->tx_word(sspi);
> - writel(SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN |
> - SIRFSOC_SPI_TX_UFLOW_INT_EN |
> - SIRFSOC_SPI_RX_OFLOW_INT_EN |
> - SIRFSOC_SPI_RX_IO_DMA_INT_EN,
> - sspi->base + sspi->regs->int_en);
> - writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN,
> - sspi->base + sspi->regs->tx_rx_en);
> - if (sspi->type == SIRF_USP_SPI_P2 ||
> - sspi->type == SIRF_USP_SPI_A7) {
> - writel(SIRFSOC_SPI_FIFO_START,
> - sspi->base + sspi->regs->rxfifo_op);
> - writel(SIRFSOC_SPI_FIFO_START,
> - sspi->base + sspi->regs->txfifo_op);
> - }
> - if (!wait_for_completion_timeout(&sspi->tx_done, timeout) ||
> - !wait_for_completion_timeout(&sspi->rx_done, timeout)) {
> - dev_err(&spi->dev, "transfer timeout\n");
> - if (sspi->type == SIRF_USP_SPI_P2 ||
> - sspi->type == SIRF_USP_SPI_A7)
> - writel(0, sspi->base + sspi->regs->tx_rx_en);
> - break;
> - }
> - while (!((readl(sspi->base + sspi->regs->rxfifo_st)
> - & SIRFSOC_SPI_FIFO_EMPTY_MASK(sspi))) &&
> - sspi->left_rx_word)
> - sspi->rx_word(sspi);
> - if (sspi->type == SIRF_USP_SPI_P2 ||
> - sspi->type == SIRF_USP_SPI_A7)
> - writel(0, sspi->base + sspi->regs->tx_rx_en);
> - writel(0, sspi->base + sspi->regs->rxfifo_op);
> - writel(0, sspi->base + sspi->regs->txfifo_op);
> - } while (sspi->left_tx_word != 0 || sspi->left_rx_word != 0);
> -}
> -
> -static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
> -{
> - struct sirfsoc_spi *sspi;
> -
> - sspi = spi_master_get_devdata(spi->master);
> - sspi->tx = t->tx_buf;
> - sspi->rx = t->rx_buf;
> - sspi->left_tx_word = sspi->left_rx_word = t->len / sspi->word_width;
> - reinit_completion(&sspi->rx_done);
> - reinit_completion(&sspi->tx_done);
> - /*
> - * in the transfer, if transfer data using command register with rx_buf
> - * null, just fill command data into command register and wait for its
> - * completion.
> - */
> - if (sspi->type == SIRF_REAL_SPI && sspi->tx_by_cmd)
> - spi_sirfsoc_cmd_transfer(spi, t);
> - else if (IS_DMA_VALID(t))
> - spi_sirfsoc_dma_transfer(spi, t);
> - else
> - spi_sirfsoc_pio_transfer(spi, t);
> -
> - return t->len - sspi->left_rx_word * sspi->word_width;
> -}
> -
> -static void spi_sirfsoc_chipselect(struct spi_device *spi, int value)
> -{
> - struct sirfsoc_spi *sspi = spi_master_get_devdata(spi->master);
> -
> - if (sspi->hw_cs) {
> - u32 regval;
> -
> - switch (sspi->type) {
> - case SIRF_REAL_SPI:
> - regval = readl(sspi->base + sspi->regs->spi_ctrl);
> - switch (value) {
> - case BITBANG_CS_ACTIVE:
> - if (spi->mode & SPI_CS_HIGH)
> - regval |= SIRFSOC_SPI_CS_IO_OUT;
> - else
> - regval &= ~SIRFSOC_SPI_CS_IO_OUT;
> - break;
> - case BITBANG_CS_INACTIVE:
> - if (spi->mode & SPI_CS_HIGH)
> - regval &= ~SIRFSOC_SPI_CS_IO_OUT;
> - else
> - regval |= SIRFSOC_SPI_CS_IO_OUT;
> - break;
> - }
> - writel(regval, sspi->base + sspi->regs->spi_ctrl);
> - break;
> - case SIRF_USP_SPI_P2:
> - case SIRF_USP_SPI_A7:
> - regval = readl(sspi->base +
> - sspi->regs->usp_pin_io_data);
> - switch (value) {
> - case BITBANG_CS_ACTIVE:
> - if (spi->mode & SPI_CS_HIGH)
> - regval |= SIRFSOC_USP_CS_HIGH_VALUE;
> - else
> - regval &= ~(SIRFSOC_USP_CS_HIGH_VALUE);
> - break;
> - case BITBANG_CS_INACTIVE:
> - if (spi->mode & SPI_CS_HIGH)
> - regval &= ~(SIRFSOC_USP_CS_HIGH_VALUE);
> - else
> - regval |= SIRFSOC_USP_CS_HIGH_VALUE;
> - break;
> - }
> - writel(regval,
> - sspi->base + sspi->regs->usp_pin_io_data);
> - break;
> - }
> - } else {
> - switch (value) {
> - case BITBANG_CS_ACTIVE:
> - gpio_direction_output(spi->cs_gpio,
> - spi->mode & SPI_CS_HIGH ? 1 : 0);
> - break;
> - case BITBANG_CS_INACTIVE:
> - gpio_direction_output(spi->cs_gpio,
> - spi->mode & SPI_CS_HIGH ? 0 : 1);
> - break;
> - }
> - }
> -}
> -
> -static int spi_sirfsoc_config_mode(struct spi_device *spi)
> -{
> - struct sirfsoc_spi *sspi;
> - u32 regval, usp_mode1;
> -
> - sspi = spi_master_get_devdata(spi->master);
> - regval = readl(sspi->base + sspi->regs->spi_ctrl);
> - usp_mode1 = readl(sspi->base + sspi->regs->usp_mode1);
> - if (!(spi->mode & SPI_CS_HIGH)) {
> - regval |= SIRFSOC_SPI_CS_IDLE_STAT;
> - usp_mode1 &= ~SIRFSOC_USP_CS_HIGH_VALID;
> - } else {
> - regval &= ~SIRFSOC_SPI_CS_IDLE_STAT;
> - usp_mode1 |= SIRFSOC_USP_CS_HIGH_VALID;
> - }
> - if (!(spi->mode & SPI_LSB_FIRST)) {
> - regval |= SIRFSOC_SPI_TRAN_MSB;
> - usp_mode1 &= ~SIRFSOC_USP_LSB;
> - } else {
> - regval &= ~SIRFSOC_SPI_TRAN_MSB;
> - usp_mode1 |= SIRFSOC_USP_LSB;
> - }
> - if (spi->mode & SPI_CPOL) {
> - regval |= SIRFSOC_SPI_CLK_IDLE_STAT;
> - usp_mode1 |= SIRFSOC_USP_SCLK_IDLE_STAT;
> - } else {
> - regval &= ~SIRFSOC_SPI_CLK_IDLE_STAT;
> - usp_mode1 &= ~SIRFSOC_USP_SCLK_IDLE_STAT;
> - }
> - /*
> - * Data should be driven at least 1/2 cycle before the fetch edge
> - * to make sure that data gets stable at the fetch edge.
> - */
> - if (((spi->mode & SPI_CPOL) && (spi->mode & SPI_CPHA)) ||
> - (!(spi->mode & SPI_CPOL) && !(spi->mode & SPI_CPHA))) {
> - regval &= ~SIRFSOC_SPI_DRV_POS_EDGE;
> - usp_mode1 |= (SIRFSOC_USP_TXD_FALLING_EDGE |
> - SIRFSOC_USP_RXD_FALLING_EDGE);
> - } else {
> - regval |= SIRFSOC_SPI_DRV_POS_EDGE;
> - usp_mode1 &= ~(SIRFSOC_USP_RXD_FALLING_EDGE |
> - SIRFSOC_USP_TXD_FALLING_EDGE);
> - }
> - writel((SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, sspi->fifo_size - 2) <<
> - SIRFSOC_SPI_FIFO_SC_OFFSET) |
> - (SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, sspi->fifo_size / 2) <<
> - SIRFSOC_SPI_FIFO_LC_OFFSET) |
> - (SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, 2) <<
> - SIRFSOC_SPI_FIFO_HC_OFFSET),
> - sspi->base + sspi->regs->txfifo_level_chk);
> - writel((SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, 2) <<
> - SIRFSOC_SPI_FIFO_SC_OFFSET) |
> - (SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, sspi->fifo_size / 2) <<
> - SIRFSOC_SPI_FIFO_LC_OFFSET) |
> - (SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, sspi->fifo_size - 2) <<
> - SIRFSOC_SPI_FIFO_HC_OFFSET),
> - sspi->base + sspi->regs->rxfifo_level_chk);
> - /*
> - * it should never set to hardware cs mode because in hardware cs mode,
> - * cs signal can't controlled by driver.
> - */
> - switch (sspi->type) {
> - case SIRF_REAL_SPI:
> - regval |= SIRFSOC_SPI_CS_IO_MODE;
> - writel(regval, sspi->base + sspi->regs->spi_ctrl);
> - break;
> - case SIRF_USP_SPI_P2:
> - case SIRF_USP_SPI_A7:
> - usp_mode1 |= SIRFSOC_USP_SYNC_MODE;
> - usp_mode1 |= SIRFSOC_USP_TFS_IO_MODE;
> - usp_mode1 &= ~SIRFSOC_USP_TFS_IO_INPUT;
> - writel(usp_mode1, sspi->base + sspi->regs->usp_mode1);
> - break;
> - }
> -
> - return 0;
> -}
> -
> -static int
> -spi_sirfsoc_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
> -{
> - struct sirfsoc_spi *sspi;
> - u8 bits_per_word = 0;
> - int hz = 0;
> - u32 regval, txfifo_ctrl, rxfifo_ctrl, tx_frm_ctl, rx_frm_ctl, usp_mode2;
> -
> - sspi = spi_master_get_devdata(spi->master);
> -
> - bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
> - hz = t && t->speed_hz ? t->speed_hz : spi->max_speed_hz;
> -
> - usp_mode2 = regval = (sspi->ctrl_freq / (2 * hz)) - 1;
> - if (regval > 0xFFFF || regval < 0) {
> - dev_err(&spi->dev, "Speed %d not supported\n", hz);
> - return -EINVAL;
> - }
> - switch (bits_per_word) {
> - case 8:
> - regval |= SIRFSOC_SPI_TRAN_DAT_FORMAT_8;
> - sspi->rx_word = spi_sirfsoc_rx_word_u8;
> - sspi->tx_word = spi_sirfsoc_tx_word_u8;
> - break;
> - case 12:
> - case 16:
> - regval |= (bits_per_word == 12) ?
> - SIRFSOC_SPI_TRAN_DAT_FORMAT_12 :
> - SIRFSOC_SPI_TRAN_DAT_FORMAT_16;
> - sspi->rx_word = spi_sirfsoc_rx_word_u16;
> - sspi->tx_word = spi_sirfsoc_tx_word_u16;
> - break;
> - case 32:
> - regval |= SIRFSOC_SPI_TRAN_DAT_FORMAT_32;
> - sspi->rx_word = spi_sirfsoc_rx_word_u32;
> - sspi->tx_word = spi_sirfsoc_tx_word_u32;
> - break;
> - default:
> - dev_err(&spi->dev, "bpw %d not supported\n", bits_per_word);
> - return -EINVAL;
> - }
> - sspi->word_width = DIV_ROUND_UP(bits_per_word, 8);
> - txfifo_ctrl = (((sspi->fifo_size / 2) &
> - SIRFSOC_SPI_FIFO_THD_MASK(sspi))
> - << SIRFSOC_SPI_FIFO_THD_OFFSET) |
> - (sspi->word_width >> 1);
> - rxfifo_ctrl = (((sspi->fifo_size / 2) &
> - SIRFSOC_SPI_FIFO_THD_MASK(sspi))
> - << SIRFSOC_SPI_FIFO_THD_OFFSET) |
> - (sspi->word_width >> 1);
> - writel(txfifo_ctrl, sspi->base + sspi->regs->txfifo_ctrl);
> - writel(rxfifo_ctrl, sspi->base + sspi->regs->rxfifo_ctrl);
> - if (sspi->type == SIRF_USP_SPI_P2 ||
> - sspi->type == SIRF_USP_SPI_A7) {
> - tx_frm_ctl = 0;
> - tx_frm_ctl |= ((bits_per_word - 1) & SIRFSOC_USP_TX_DATA_MASK)
> - << SIRFSOC_USP_TX_DATA_OFFSET;
> - tx_frm_ctl |= ((bits_per_word + 1 + SIRFSOC_USP_TXD_DELAY_LEN
> - - 1) & SIRFSOC_USP_TX_SYNC_MASK) <<
> - SIRFSOC_USP_TX_SYNC_OFFSET;
> - tx_frm_ctl |= ((bits_per_word + 1 + SIRFSOC_USP_TXD_DELAY_LEN
> - + 2 - 1) & SIRFSOC_USP_TX_FRAME_MASK) <<
> - SIRFSOC_USP_TX_FRAME_OFFSET;
> - tx_frm_ctl |= ((bits_per_word - 1) &
> - SIRFSOC_USP_TX_SHIFTER_MASK) <<
> - SIRFSOC_USP_TX_SHIFTER_OFFSET;
> - rx_frm_ctl = 0;
> - rx_frm_ctl |= ((bits_per_word - 1) & SIRFSOC_USP_RX_DATA_MASK)
> - << SIRFSOC_USP_RX_DATA_OFFSET;
> - rx_frm_ctl |= ((bits_per_word + 1 + SIRFSOC_USP_RXD_DELAY_LEN
> - + 2 - 1) & SIRFSOC_USP_RX_FRAME_MASK) <<
> - SIRFSOC_USP_RX_FRAME_OFFSET;
> - rx_frm_ctl |= ((bits_per_word - 1)
> - & SIRFSOC_USP_RX_SHIFTER_MASK) <<
> - SIRFSOC_USP_RX_SHIFTER_OFFSET;
> - writel(tx_frm_ctl | (((usp_mode2 >> 10) &
> - SIRFSOC_USP_CLK_10_11_MASK) <<
> - SIRFSOC_USP_CLK_10_11_OFFSET),
> - sspi->base + sspi->regs->usp_tx_frame_ctrl);
> - writel(rx_frm_ctl | (((usp_mode2 >> 12) &
> - SIRFSOC_USP_CLK_12_15_MASK) <<
> - SIRFSOC_USP_CLK_12_15_OFFSET),
> - sspi->base + sspi->regs->usp_rx_frame_ctrl);
> - writel(readl(sspi->base + sspi->regs->usp_mode2) |
> - ((usp_mode2 & SIRFSOC_USP_CLK_DIVISOR_MASK) <<
> - SIRFSOC_USP_CLK_DIVISOR_OFFSET) |
> - (SIRFSOC_USP_RXD_DELAY_LEN <<
> - SIRFSOC_USP_RXD_DELAY_OFFSET) |
> - (SIRFSOC_USP_TXD_DELAY_LEN <<
> - SIRFSOC_USP_TXD_DELAY_OFFSET),
> - sspi->base + sspi->regs->usp_mode2);
> - }
> - if (sspi->type == SIRF_REAL_SPI)
> - writel(regval, sspi->base + sspi->regs->spi_ctrl);
> - spi_sirfsoc_config_mode(spi);
> - if (sspi->type == SIRF_REAL_SPI) {
> - if (t && t->tx_buf && !t->rx_buf &&
> - (t->len <= SIRFSOC_MAX_CMD_BYTES)) {
> - sspi->tx_by_cmd = true;
> - writel(readl(sspi->base + sspi->regs->spi_ctrl) |
> - (SIRFSOC_SPI_CMD_BYTE_NUM((t->len - 1)) |
> - SIRFSOC_SPI_CMD_MODE),
> - sspi->base + sspi->regs->spi_ctrl);
> - } else {
> - sspi->tx_by_cmd = false;
> - writel(readl(sspi->base + sspi->regs->spi_ctrl) &
> - ~SIRFSOC_SPI_CMD_MODE,
> - sspi->base + sspi->regs->spi_ctrl);
> - }
> - }
> - if (IS_DMA_VALID(t)) {
> - /* Enable DMA mode for RX, TX */
> - writel(0, sspi->base + sspi->regs->tx_dma_io_ctrl);
> - writel(SIRFSOC_SPI_RX_DMA_FLUSH,
> - sspi->base + sspi->regs->rx_dma_io_ctrl);
> - } else {
> - /* Enable IO mode for RX, TX */
> - writel(SIRFSOC_SPI_IO_MODE_SEL,
> - sspi->base + sspi->regs->tx_dma_io_ctrl);
> - writel(SIRFSOC_SPI_IO_MODE_SEL,
> - sspi->base + sspi->regs->rx_dma_io_ctrl);
> - }
> - return 0;
> -}
> -
> -static int spi_sirfsoc_setup(struct spi_device *spi)
> -{
> - struct sirfsoc_spi *sspi;
> - int ret = 0;
> -
> - sspi = spi_master_get_devdata(spi->master);
> - if (spi->cs_gpio == -ENOENT)
> - sspi->hw_cs = true;
> - else {
> - sspi->hw_cs = false;
> - if (!spi_get_ctldata(spi)) {
> - void *cs = kmalloc(sizeof(int), GFP_KERNEL);
> - if (!cs) {
> - ret = -ENOMEM;
> - goto exit;
> - }
> - ret = gpio_is_valid(spi->cs_gpio);
> - if (!ret) {
> - dev_err(&spi->dev, "no valid gpio\n");
> - ret = -ENOENT;
> - goto exit;
> - }
> - ret = gpio_request(spi->cs_gpio, DRIVER_NAME);
> - if (ret) {
> - dev_err(&spi->dev, "failed to request gpio\n");
> - goto exit;
> - }
> - spi_set_ctldata(spi, cs);
> - }
> - }
> - spi_sirfsoc_config_mode(spi);
> - spi_sirfsoc_chipselect(spi, BITBANG_CS_INACTIVE);
> -exit:
> - return ret;
> -}
> -
> -static void spi_sirfsoc_cleanup(struct spi_device *spi)
> -{
> - if (spi_get_ctldata(spi)) {
> - gpio_free(spi->cs_gpio);
> - kfree(spi_get_ctldata(spi));
> - }
> -}
> -
> -static const struct sirf_spi_comp_data sirf_real_spi = {
> - .regs = &real_spi_register,
> - .type = SIRF_REAL_SPI,
> - .dat_max_frm_len = 64 * 1024,
> - .fifo_size = 256,
> -};
> -
> -static const struct sirf_spi_comp_data sirf_usp_spi_p2 = {
> - .regs = &usp_spi_register,
> - .type = SIRF_USP_SPI_P2,
> - .dat_max_frm_len = 1024 * 1024,
> - .fifo_size = 128,
> - .hwinit = sirfsoc_usp_hwinit,
> -};
> -
> -static const struct sirf_spi_comp_data sirf_usp_spi_a7 = {
> - .regs = &usp_spi_register,
> - .type = SIRF_USP_SPI_A7,
> - .dat_max_frm_len = 1024 * 1024,
> - .fifo_size = 512,
> - .hwinit = sirfsoc_usp_hwinit,
> -};
> -
> -static const struct of_device_id spi_sirfsoc_of_match[] = {
> - { .compatible = "sirf,prima2-spi", .data = &sirf_real_spi},
> - { .compatible = "sirf,prima2-usp-spi", .data = &sirf_usp_spi_p2},
> - { .compatible = "sirf,atlas7-usp-spi", .data = &sirf_usp_spi_a7},
> - {}
> -};
> -MODULE_DEVICE_TABLE(of, spi_sirfsoc_of_match);
> -
> -static int spi_sirfsoc_probe(struct platform_device *pdev)
> -{
> - struct sirfsoc_spi *sspi;
> - struct spi_master *master;
> - const struct sirf_spi_comp_data *spi_comp_data;
> - int irq;
> - int ret;
> - const struct of_device_id *match;
> -
> - ret = device_reset(&pdev->dev);
> - if (ret) {
> - dev_err(&pdev->dev, "SPI reset failed!\n");
> - return ret;
> - }
> -
> - master = spi_alloc_master(&pdev->dev, sizeof(*sspi));
> - if (!master) {
> - dev_err(&pdev->dev, "Unable to allocate SPI master\n");
> - return -ENOMEM;
> - }
> - match = of_match_node(spi_sirfsoc_of_match, pdev->dev.of_node);
> - platform_set_drvdata(pdev, master);
> - sspi = spi_master_get_devdata(master);
> - sspi->fifo_full_offset = ilog2(sspi->fifo_size);
> - spi_comp_data = match->data;
> - sspi->regs = spi_comp_data->regs;
> - sspi->type = spi_comp_data->type;
> - sspi->fifo_level_chk_mask = (sspi->fifo_size / 4) - 1;
> - sspi->dat_max_frm_len = spi_comp_data->dat_max_frm_len;
> - sspi->fifo_size = spi_comp_data->fifo_size;
> - sspi->base = devm_platform_ioremap_resource(pdev, 0);
> - if (IS_ERR(sspi->base)) {
> - ret = PTR_ERR(sspi->base);
> - goto free_master;
> - }
> - irq = platform_get_irq(pdev, 0);
> - if (irq < 0) {
> - ret = -ENXIO;
> - goto free_master;
> - }
> - ret = devm_request_irq(&pdev->dev, irq, spi_sirfsoc_irq, 0,
> - DRIVER_NAME, sspi);
> - if (ret)
> - goto free_master;
> -
> - sspi->bitbang.master = master;
> - sspi->bitbang.chipselect = spi_sirfsoc_chipselect;
> - sspi->bitbang.setup_transfer = spi_sirfsoc_setup_transfer;
> - sspi->bitbang.txrx_bufs = spi_sirfsoc_transfer;
> - sspi->bitbang.master->setup = spi_sirfsoc_setup;
> - sspi->bitbang.master->cleanup = spi_sirfsoc_cleanup;
> - master->bus_num = pdev->id;
> - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH;
> - master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(12) |
> - SPI_BPW_MASK(16) | SPI_BPW_MASK(32);
> - master->max_speed_hz = SIRFSOC_SPI_DEFAULT_FRQ;
> - master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;
> - sspi->bitbang.master->dev.of_node = pdev->dev.of_node;
> -
> - /* request DMA channels */
> - sspi->rx_chan = dma_request_chan(&pdev->dev, "rx");
> - if (IS_ERR(sspi->rx_chan)) {
> - dev_err(&pdev->dev, "can not allocate rx dma channel\n");
> - ret = PTR_ERR(sspi->rx_chan);
> - goto free_master;
> - }
> - sspi->tx_chan = dma_request_chan(&pdev->dev, "tx");
> - if (IS_ERR(sspi->tx_chan)) {
> - dev_err(&pdev->dev, "can not allocate tx dma channel\n");
> - ret = PTR_ERR(sspi->tx_chan);
> - goto free_rx_dma;
> - }
> -
> - sspi->clk = clk_get(&pdev->dev, NULL);
> - if (IS_ERR(sspi->clk)) {
> - ret = PTR_ERR(sspi->clk);
> - goto free_tx_dma;
> - }
> - clk_prepare_enable(sspi->clk);
> - if (spi_comp_data->hwinit)
> - spi_comp_data->hwinit(sspi);
> - sspi->ctrl_freq = clk_get_rate(sspi->clk);
> -
> - init_completion(&sspi->rx_done);
> - init_completion(&sspi->tx_done);
> -
> - ret = spi_bitbang_start(&sspi->bitbang);
> - if (ret)
> - goto free_clk;
> - dev_info(&pdev->dev, "registered, bus number = %d\n", master->bus_num);
> -
> - return 0;
> -free_clk:
> - clk_disable_unprepare(sspi->clk);
> - clk_put(sspi->clk);
> -free_tx_dma:
> - dma_release_channel(sspi->tx_chan);
> -free_rx_dma:
> - dma_release_channel(sspi->rx_chan);
> -free_master:
> - spi_master_put(master);
> -
> - return ret;
> -}
> -
> -static int spi_sirfsoc_remove(struct platform_device *pdev)
> -{
> - struct spi_master *master;
> - struct sirfsoc_spi *sspi;
> -
> - master = platform_get_drvdata(pdev);
> - sspi = spi_master_get_devdata(master);
> - spi_bitbang_stop(&sspi->bitbang);
> - clk_disable_unprepare(sspi->clk);
> - clk_put(sspi->clk);
> - dma_release_channel(sspi->rx_chan);
> - dma_release_channel(sspi->tx_chan);
> - spi_master_put(master);
> - return 0;
> -}
> -
> -#ifdef CONFIG_PM_SLEEP
> -static int spi_sirfsoc_suspend(struct device *dev)
> -{
> - struct spi_master *master = dev_get_drvdata(dev);
> - struct sirfsoc_spi *sspi = spi_master_get_devdata(master);
> - int ret;
> -
> - ret = spi_master_suspend(master);
> - if (ret)
> - return ret;
> -
> - clk_disable(sspi->clk);
> - return 0;
> -}
> -
> -static int spi_sirfsoc_resume(struct device *dev)
> -{
> - struct spi_master *master = dev_get_drvdata(dev);
> - struct sirfsoc_spi *sspi = spi_master_get_devdata(master);
> -
> - clk_enable(sspi->clk);
> - writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->txfifo_op);
> - writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->rxfifo_op);
> - writel(SIRFSOC_SPI_FIFO_START, sspi->base + sspi->regs->txfifo_op);
> - writel(SIRFSOC_SPI_FIFO_START, sspi->base + sspi->regs->rxfifo_op);
> - return 0;
> -}
> -#endif
> -
> -static SIMPLE_DEV_PM_OPS(spi_sirfsoc_pm_ops, spi_sirfsoc_suspend,
> - spi_sirfsoc_resume);
> -
> -static struct platform_driver spi_sirfsoc_driver = {
> - .driver = {
> - .name = DRIVER_NAME,
> - .pm = &spi_sirfsoc_pm_ops,
> - .of_match_table = spi_sirfsoc_of_match,
> - },
> - .probe = spi_sirfsoc_probe,
> - .remove = spi_sirfsoc_remove,
> -};
> -module_platform_driver(spi_sirfsoc_driver);
> -MODULE_DESCRIPTION("SiRF SoC SPI master driver");
> -MODULE_AUTHOR("Zhiwu Song <Zhiwu.Song@....com>");
> -MODULE_AUTHOR("Barry Song <Baohua.Song@....com>");
> -MODULE_AUTHOR("Qipan Li <Qipan.Li@....com>");
> -MODULE_LICENSE("GPL v2");
> --
> 2.29.2
>
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