2011-06-06 07:16:30 +00:00
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/*
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2009-11-30 07:39:42 +00:00
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* Copyright (C) 2009 Samsung Electronics Ltd.
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* Jaswinder Singh <jassi.brar@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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#include <mach/dma.h>
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2010-01-20 20:49:45 +00:00
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#include <plat/s3c64xx-spi.h>
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2009-11-30 07:39:42 +00:00
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/* Registers and bit-fields */
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#define S3C64XX_SPI_CH_CFG 0x00
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#define S3C64XX_SPI_CLK_CFG 0x04
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#define S3C64XX_SPI_MODE_CFG 0x08
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#define S3C64XX_SPI_SLAVE_SEL 0x0C
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#define S3C64XX_SPI_INT_EN 0x10
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#define S3C64XX_SPI_STATUS 0x14
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#define S3C64XX_SPI_TX_DATA 0x18
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#define S3C64XX_SPI_RX_DATA 0x1C
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#define S3C64XX_SPI_PACKET_CNT 0x20
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#define S3C64XX_SPI_PENDING_CLR 0x24
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#define S3C64XX_SPI_SWAP_CFG 0x28
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#define S3C64XX_SPI_FB_CLK 0x2C
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#define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */
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#define S3C64XX_SPI_CH_SW_RST (1<<5)
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#define S3C64XX_SPI_CH_SLAVE (1<<4)
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#define S3C64XX_SPI_CPOL_L (1<<3)
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#define S3C64XX_SPI_CPHA_B (1<<2)
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#define S3C64XX_SPI_CH_RXCH_ON (1<<1)
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#define S3C64XX_SPI_CH_TXCH_ON (1<<0)
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#define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9)
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#define S3C64XX_SPI_CLKSEL_SRCSHFT 9
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#define S3C64XX_SPI_ENCLK_ENABLE (1<<8)
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#define S3C64XX_SPI_PSR_MASK 0xff
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#define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29)
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#define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29)
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#define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29)
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#define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29)
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#define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17)
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#define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17)
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#define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17)
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#define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17)
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#define S3C64XX_SPI_MODE_RXDMA_ON (1<<2)
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#define S3C64XX_SPI_MODE_TXDMA_ON (1<<1)
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#define S3C64XX_SPI_MODE_4BURST (1<<0)
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#define S3C64XX_SPI_SLAVE_AUTO (1<<1)
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#define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0)
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#define S3C64XX_SPI_ACT(c) writel(0, (c)->regs + S3C64XX_SPI_SLAVE_SEL)
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#define S3C64XX_SPI_DEACT(c) writel(S3C64XX_SPI_SLAVE_SIG_INACT, \
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(c)->regs + S3C64XX_SPI_SLAVE_SEL)
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#define S3C64XX_SPI_INT_TRAILING_EN (1<<6)
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#define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5)
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#define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4)
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#define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3)
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#define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2)
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#define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1)
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#define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0)
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#define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5)
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#define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4)
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#define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3)
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#define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2)
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#define S3C64XX_SPI_ST_RX_FIFORDY (1<<1)
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#define S3C64XX_SPI_ST_TX_FIFORDY (1<<0)
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#define S3C64XX_SPI_PACKET_CNT_EN (1<<16)
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#define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4)
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#define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3)
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#define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2)
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#define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1)
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#define S3C64XX_SPI_PND_TRAILING_CLR (1<<0)
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#define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7)
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#define S3C64XX_SPI_SWAP_RX_BYTE (1<<6)
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#define S3C64XX_SPI_SWAP_RX_BIT (1<<5)
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#define S3C64XX_SPI_SWAP_RX_EN (1<<4)
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#define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3)
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#define S3C64XX_SPI_SWAP_TX_BYTE (1<<2)
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#define S3C64XX_SPI_SWAP_TX_BIT (1<<1)
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#define S3C64XX_SPI_SWAP_TX_EN (1<<0)
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#define S3C64XX_SPI_FBCLK_MSK (3<<0)
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#define S3C64XX_SPI_ST_TRLCNTZ(v, i) ((((v) >> (i)->rx_lvl_offset) & \
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(((i)->fifo_lvl_mask + 1))) \
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? 1 : 0)
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2011-07-05 08:14:02 +00:00
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#define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & (1 << (i)->tx_st_done)) ? 1 : 0)
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2009-11-30 07:39:42 +00:00
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#define TX_FIFO_LVL(v, i) (((v) >> 6) & (i)->fifo_lvl_mask)
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#define RX_FIFO_LVL(v, i) (((v) >> (i)->rx_lvl_offset) & (i)->fifo_lvl_mask)
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#define S3C64XX_SPI_MAX_TRAILCNT 0x3ff
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#define S3C64XX_SPI_TRAILCNT_OFF 19
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#define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT
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#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
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#define SUSPND (1<<0)
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#define SPIBUSY (1<<1)
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#define RXBUSY (1<<2)
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#define TXBUSY (1<<3)
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2011-09-02 00:44:42 +00:00
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struct s3c64xx_spi_dma_data {
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unsigned ch;
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enum dma_data_direction direction;
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enum dma_ch dmach;
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};
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2009-11-30 07:39:42 +00:00
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/**
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* struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
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* @clk: Pointer to the spi clock.
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2010-01-20 20:49:44 +00:00
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* @src_clk: Pointer to the clock used to generate SPI signals.
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2009-11-30 07:39:42 +00:00
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* @master: Pointer to the SPI Protocol master.
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* @workqueue: Work queue for the SPI xfer requests.
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* @cntrlr_info: Platform specific data for the controller this driver manages.
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* @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint.
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* @work: Work
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* @queue: To log SPI xfer requests.
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* @lock: Controller specific lock.
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* @state: Set of FLAGS to indicate status.
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* @rx_dmach: Controller's DMA channel for Rx.
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* @tx_dmach: Controller's DMA channel for Tx.
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* @sfr_start: BUS address of SPI controller regs.
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* @regs: Pointer to ioremap'ed controller registers.
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* @xfer_completion: To indicate completion of xfer task.
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* @cur_mode: Stores the active configuration of the controller.
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* @cur_bpw: Stores the active bits per word settings.
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* @cur_speed: Stores the active xfer clock speed.
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*/
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struct s3c64xx_spi_driver_data {
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void __iomem *regs;
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struct clk *clk;
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2010-01-20 20:49:44 +00:00
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struct clk *src_clk;
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2009-11-30 07:39:42 +00:00
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struct platform_device *pdev;
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struct spi_master *master;
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struct workqueue_struct *workqueue;
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2010-01-20 20:49:44 +00:00
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struct s3c64xx_spi_info *cntrlr_info;
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2009-11-30 07:39:42 +00:00
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struct spi_device *tgl_spi;
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struct work_struct work;
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struct list_head queue;
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spinlock_t lock;
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unsigned long sfr_start;
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struct completion xfer_completion;
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unsigned state;
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unsigned cur_mode, cur_bpw;
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unsigned cur_speed;
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2011-09-02 00:44:42 +00:00
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struct s3c64xx_spi_dma_data rx_dma;
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struct s3c64xx_spi_dma_data tx_dma;
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2011-09-02 00:44:41 +00:00
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struct samsung_dma_ops *ops;
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2009-11-30 07:39:42 +00:00
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};
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static struct s3c2410_dma_client s3c64xx_spi_dma_client = {
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.name = "samsung-spi-dma",
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};
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static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
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{
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2010-01-20 20:49:44 +00:00
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struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
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2009-11-30 07:39:42 +00:00
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void __iomem *regs = sdd->regs;
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unsigned long loops;
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u32 val;
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writel(0, regs + S3C64XX_SPI_PACKET_CNT);
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val = readl(regs + S3C64XX_SPI_CH_CFG);
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val |= S3C64XX_SPI_CH_SW_RST;
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val &= ~S3C64XX_SPI_CH_HS_EN;
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writel(val, regs + S3C64XX_SPI_CH_CFG);
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/* Flush TxFIFO*/
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loops = msecs_to_loops(1);
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do {
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val = readl(regs + S3C64XX_SPI_STATUS);
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} while (TX_FIFO_LVL(val, sci) && loops--);
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2010-08-23 16:40:56 +00:00
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if (loops == 0)
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dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
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2009-11-30 07:39:42 +00:00
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/* Flush RxFIFO*/
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loops = msecs_to_loops(1);
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do {
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val = readl(regs + S3C64XX_SPI_STATUS);
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if (RX_FIFO_LVL(val, sci))
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readl(regs + S3C64XX_SPI_RX_DATA);
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else
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break;
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} while (loops--);
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2010-08-23 16:40:56 +00:00
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if (loops == 0)
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dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
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2009-11-30 07:39:42 +00:00
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val = readl(regs + S3C64XX_SPI_CH_CFG);
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val &= ~S3C64XX_SPI_CH_SW_RST;
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writel(val, regs + S3C64XX_SPI_CH_CFG);
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val = readl(regs + S3C64XX_SPI_MODE_CFG);
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val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
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writel(val, regs + S3C64XX_SPI_MODE_CFG);
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val = readl(regs + S3C64XX_SPI_CH_CFG);
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val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
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writel(val, regs + S3C64XX_SPI_CH_CFG);
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}
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2011-09-02 00:44:42 +00:00
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static void s3c64xx_spi_dmacb(void *data)
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2011-09-02 00:44:41 +00:00
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{
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2011-09-02 00:44:42 +00:00
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struct s3c64xx_spi_driver_data *sdd;
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struct s3c64xx_spi_dma_data *dma = data;
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2011-09-02 00:44:41 +00:00
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unsigned long flags;
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2011-09-02 00:44:42 +00:00
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if (dma->direction == DMA_FROM_DEVICE)
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sdd = container_of(data,
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struct s3c64xx_spi_driver_data, rx_dma);
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else
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sdd = container_of(data,
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struct s3c64xx_spi_driver_data, tx_dma);
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2011-09-02 00:44:41 +00:00
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spin_lock_irqsave(&sdd->lock, flags);
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2011-09-02 00:44:42 +00:00
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if (dma->direction == DMA_FROM_DEVICE) {
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sdd->state &= ~RXBUSY;
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if (!(sdd->state & TXBUSY))
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complete(&sdd->xfer_completion);
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} else {
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sdd->state &= ~TXBUSY;
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if (!(sdd->state & RXBUSY))
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complete(&sdd->xfer_completion);
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}
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2011-09-02 00:44:41 +00:00
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spin_unlock_irqrestore(&sdd->lock, flags);
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}
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2011-09-02 00:44:42 +00:00
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static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
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unsigned len, dma_addr_t buf)
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2011-09-02 00:44:41 +00:00
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{
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2011-09-02 00:44:42 +00:00
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struct s3c64xx_spi_driver_data *sdd;
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struct samsung_dma_prep_info info;
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2011-09-02 00:44:41 +00:00
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2011-09-02 00:44:42 +00:00
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if (dma->direction == DMA_FROM_DEVICE)
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sdd = container_of((void *)dma,
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struct s3c64xx_spi_driver_data, rx_dma);
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else
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sdd = container_of((void *)dma,
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struct s3c64xx_spi_driver_data, tx_dma);
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2011-09-02 00:44:41 +00:00
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2011-09-02 00:44:42 +00:00
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info.cap = DMA_SLAVE;
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info.len = len;
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info.fp = s3c64xx_spi_dmacb;
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info.fp_param = dma;
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info.direction = dma->direction;
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info.buf = buf;
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sdd->ops->prepare(dma->ch, &info);
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sdd->ops->trigger(dma->ch);
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}
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2011-09-02 00:44:41 +00:00
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2011-09-02 00:44:42 +00:00
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static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
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|
|
|
{
|
|
|
|
struct samsung_dma_info info;
|
|
|
|
|
|
|
|
sdd->ops = samsung_dma_get_ops();
|
|
|
|
|
|
|
|
info.cap = DMA_SLAVE;
|
|
|
|
info.client = &s3c64xx_spi_dma_client;
|
|
|
|
info.width = sdd->cur_bpw / 8;
|
|
|
|
|
|
|
|
info.direction = sdd->rx_dma.direction;
|
|
|
|
info.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
|
|
|
|
sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &info);
|
|
|
|
info.direction = sdd->tx_dma.direction;
|
|
|
|
info.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
|
|
|
|
sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &info);
|
|
|
|
|
|
|
|
return 1;
|
2011-09-02 00:44:41 +00:00
|
|
|
}
|
|
|
|
|
2009-11-30 07:39:42 +00:00
|
|
|
static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
|
|
|
|
struct spi_device *spi,
|
|
|
|
struct spi_transfer *xfer, int dma_mode)
|
|
|
|
{
|
2010-01-20 20:49:44 +00:00
|
|
|
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
|
2009-11-30 07:39:42 +00:00
|
|
|
void __iomem *regs = sdd->regs;
|
|
|
|
u32 modecfg, chcfg;
|
|
|
|
|
|
|
|
modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
|
|
|
|
modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
|
|
|
|
|
|
|
|
chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
|
|
|
|
chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
|
|
|
|
|
|
|
|
if (dma_mode) {
|
|
|
|
chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
|
|
|
|
} else {
|
|
|
|
/* Always shift in data in FIFO, even if xfer is Tx only,
|
|
|
|
* this helps setting PCKT_CNT value for generating clocks
|
|
|
|
* as exactly needed.
|
|
|
|
*/
|
|
|
|
chcfg |= S3C64XX_SPI_CH_RXCH_ON;
|
|
|
|
writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
|
|
|
|
| S3C64XX_SPI_PACKET_CNT_EN,
|
|
|
|
regs + S3C64XX_SPI_PACKET_CNT);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (xfer->tx_buf != NULL) {
|
|
|
|
sdd->state |= TXBUSY;
|
|
|
|
chcfg |= S3C64XX_SPI_CH_TXCH_ON;
|
|
|
|
if (dma_mode) {
|
|
|
|
modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
|
2011-09-02 00:44:42 +00:00
|
|
|
prepare_dma(&sdd->tx_dma, xfer->len, xfer->tx_dma);
|
2009-11-30 07:39:42 +00:00
|
|
|
} else {
|
2010-09-29 08:31:33 +00:00
|
|
|
switch (sdd->cur_bpw) {
|
|
|
|
case 32:
|
|
|
|
iowrite32_rep(regs + S3C64XX_SPI_TX_DATA,
|
|
|
|
xfer->tx_buf, xfer->len / 4);
|
|
|
|
break;
|
|
|
|
case 16:
|
|
|
|
iowrite16_rep(regs + S3C64XX_SPI_TX_DATA,
|
|
|
|
xfer->tx_buf, xfer->len / 2);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
iowrite8_rep(regs + S3C64XX_SPI_TX_DATA,
|
|
|
|
xfer->tx_buf, xfer->len);
|
|
|
|
break;
|
|
|
|
}
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (xfer->rx_buf != NULL) {
|
|
|
|
sdd->state |= RXBUSY;
|
|
|
|
|
|
|
|
if (sci->high_speed && sdd->cur_speed >= 30000000UL
|
|
|
|
&& !(sdd->cur_mode & SPI_CPHA))
|
|
|
|
chcfg |= S3C64XX_SPI_CH_HS_EN;
|
|
|
|
|
|
|
|
if (dma_mode) {
|
|
|
|
modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
|
|
|
|
chcfg |= S3C64XX_SPI_CH_RXCH_ON;
|
|
|
|
writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
|
|
|
|
| S3C64XX_SPI_PACKET_CNT_EN,
|
|
|
|
regs + S3C64XX_SPI_PACKET_CNT);
|
2011-09-02 00:44:42 +00:00
|
|
|
prepare_dma(&sdd->rx_dma, xfer->len, xfer->rx_dma);
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
|
|
|
|
writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd,
|
|
|
|
struct spi_device *spi)
|
|
|
|
{
|
|
|
|
struct s3c64xx_spi_csinfo *cs;
|
|
|
|
|
|
|
|
if (sdd->tgl_spi != NULL) { /* If last device toggled after mssg */
|
|
|
|
if (sdd->tgl_spi != spi) { /* if last mssg on diff device */
|
|
|
|
/* Deselect the last toggled device */
|
|
|
|
cs = sdd->tgl_spi->controller_data;
|
2010-01-20 20:49:45 +00:00
|
|
|
cs->set_level(cs->line,
|
|
|
|
spi->mode & SPI_CS_HIGH ? 0 : 1);
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
sdd->tgl_spi = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
cs = spi->controller_data;
|
2010-01-20 20:49:45 +00:00
|
|
|
cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0);
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd,
|
|
|
|
struct spi_transfer *xfer, int dma_mode)
|
|
|
|
{
|
2010-01-20 20:49:44 +00:00
|
|
|
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
|
2009-11-30 07:39:42 +00:00
|
|
|
void __iomem *regs = sdd->regs;
|
|
|
|
unsigned long val;
|
|
|
|
int ms;
|
|
|
|
|
|
|
|
/* millisecs to xfer 'len' bytes @ 'cur_speed' */
|
|
|
|
ms = xfer->len * 8 * 1000 / sdd->cur_speed;
|
2010-09-07 15:37:52 +00:00
|
|
|
ms += 10; /* some tolerance */
|
2009-11-30 07:39:42 +00:00
|
|
|
|
|
|
|
if (dma_mode) {
|
|
|
|
val = msecs_to_jiffies(ms) + 10;
|
|
|
|
val = wait_for_completion_timeout(&sdd->xfer_completion, val);
|
|
|
|
} else {
|
2010-09-03 01:36:46 +00:00
|
|
|
u32 status;
|
2009-11-30 07:39:42 +00:00
|
|
|
val = msecs_to_loops(ms);
|
|
|
|
do {
|
2010-09-03 01:36:46 +00:00
|
|
|
status = readl(regs + S3C64XX_SPI_STATUS);
|
|
|
|
} while (RX_FIFO_LVL(status, sci) < xfer->len && --val);
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (!val)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
if (dma_mode) {
|
|
|
|
u32 status;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* DmaTx returns after simply writing data in the FIFO,
|
|
|
|
* w/o waiting for real transmission on the bus to finish.
|
|
|
|
* DmaRx returns only after Dma read data from FIFO which
|
|
|
|
* needs bus transmission to finish, so we don't worry if
|
|
|
|
* Xfer involved Rx(with or without Tx).
|
|
|
|
*/
|
|
|
|
if (xfer->rx_buf == NULL) {
|
|
|
|
val = msecs_to_loops(10);
|
|
|
|
status = readl(regs + S3C64XX_SPI_STATUS);
|
|
|
|
while ((TX_FIFO_LVL(status, sci)
|
|
|
|
|| !S3C64XX_SPI_ST_TX_DONE(status, sci))
|
|
|
|
&& --val) {
|
|
|
|
cpu_relax();
|
|
|
|
status = readl(regs + S3C64XX_SPI_STATUS);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!val)
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* If it was only Tx */
|
|
|
|
if (xfer->rx_buf == NULL) {
|
|
|
|
sdd->state &= ~TXBUSY;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-09-29 08:31:33 +00:00
|
|
|
switch (sdd->cur_bpw) {
|
|
|
|
case 32:
|
|
|
|
ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
|
|
|
|
xfer->rx_buf, xfer->len / 4);
|
|
|
|
break;
|
|
|
|
case 16:
|
|
|
|
ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
|
|
|
|
xfer->rx_buf, xfer->len / 2);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
|
|
|
|
xfer->rx_buf, xfer->len);
|
|
|
|
break;
|
|
|
|
}
|
2009-11-30 07:39:42 +00:00
|
|
|
sdd->state &= ~RXBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
|
|
|
|
struct spi_device *spi)
|
|
|
|
{
|
|
|
|
struct s3c64xx_spi_csinfo *cs = spi->controller_data;
|
|
|
|
|
|
|
|
if (sdd->tgl_spi == spi)
|
|
|
|
sdd->tgl_spi = NULL;
|
|
|
|
|
2010-01-20 20:49:45 +00:00
|
|
|
cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1);
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
|
|
|
|
{
|
2010-09-29 08:31:33 +00:00
|
|
|
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
|
2009-11-30 07:39:42 +00:00
|
|
|
void __iomem *regs = sdd->regs;
|
|
|
|
u32 val;
|
|
|
|
|
|
|
|
/* Disable Clock */
|
2010-09-29 08:31:33 +00:00
|
|
|
if (sci->clk_from_cmu) {
|
|
|
|
clk_disable(sdd->src_clk);
|
|
|
|
} else {
|
|
|
|
val = readl(regs + S3C64XX_SPI_CLK_CFG);
|
|
|
|
val &= ~S3C64XX_SPI_ENCLK_ENABLE;
|
|
|
|
writel(val, regs + S3C64XX_SPI_CLK_CFG);
|
|
|
|
}
|
2009-11-30 07:39:42 +00:00
|
|
|
|
|
|
|
/* Set Polarity and Phase */
|
|
|
|
val = readl(regs + S3C64XX_SPI_CH_CFG);
|
|
|
|
val &= ~(S3C64XX_SPI_CH_SLAVE |
|
|
|
|
S3C64XX_SPI_CPOL_L |
|
|
|
|
S3C64XX_SPI_CPHA_B);
|
|
|
|
|
|
|
|
if (sdd->cur_mode & SPI_CPOL)
|
|
|
|
val |= S3C64XX_SPI_CPOL_L;
|
|
|
|
|
|
|
|
if (sdd->cur_mode & SPI_CPHA)
|
|
|
|
val |= S3C64XX_SPI_CPHA_B;
|
|
|
|
|
|
|
|
writel(val, regs + S3C64XX_SPI_CH_CFG);
|
|
|
|
|
|
|
|
/* Set Channel & DMA Mode */
|
|
|
|
val = readl(regs + S3C64XX_SPI_MODE_CFG);
|
|
|
|
val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
|
|
|
|
| S3C64XX_SPI_MODE_CH_TSZ_MASK);
|
|
|
|
|
|
|
|
switch (sdd->cur_bpw) {
|
|
|
|
case 32:
|
|
|
|
val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
|
2010-09-29 08:31:33 +00:00
|
|
|
val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
|
2009-11-30 07:39:42 +00:00
|
|
|
break;
|
|
|
|
case 16:
|
|
|
|
val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
|
2010-09-29 08:31:33 +00:00
|
|
|
val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
|
2009-11-30 07:39:42 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
|
2010-09-29 08:31:33 +00:00
|
|
|
val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
|
2009-11-30 07:39:42 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
writel(val, regs + S3C64XX_SPI_MODE_CFG);
|
|
|
|
|
2010-09-29 08:31:33 +00:00
|
|
|
if (sci->clk_from_cmu) {
|
|
|
|
/* Configure Clock */
|
|
|
|
/* There is half-multiplier before the SPI */
|
|
|
|
clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
|
|
|
|
/* Enable Clock */
|
|
|
|
clk_enable(sdd->src_clk);
|
|
|
|
} else {
|
|
|
|
/* Configure Clock */
|
|
|
|
val = readl(regs + S3C64XX_SPI_CLK_CFG);
|
|
|
|
val &= ~S3C64XX_SPI_PSR_MASK;
|
|
|
|
val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
|
|
|
|
& S3C64XX_SPI_PSR_MASK);
|
|
|
|
writel(val, regs + S3C64XX_SPI_CLK_CFG);
|
|
|
|
|
|
|
|
/* Enable Clock */
|
|
|
|
val = readl(regs + S3C64XX_SPI_CLK_CFG);
|
|
|
|
val |= S3C64XX_SPI_ENCLK_ENABLE;
|
|
|
|
writel(val, regs + S3C64XX_SPI_CLK_CFG);
|
|
|
|
}
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
|
|
|
|
|
|
|
|
static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
|
|
|
|
struct spi_message *msg)
|
|
|
|
{
|
2010-09-29 08:31:31 +00:00
|
|
|
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
|
2009-11-30 07:39:42 +00:00
|
|
|
struct device *dev = &sdd->pdev->dev;
|
|
|
|
struct spi_transfer *xfer;
|
|
|
|
|
|
|
|
if (msg->is_dma_mapped)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* First mark all xfer unmapped */
|
|
|
|
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
|
|
|
|
xfer->rx_dma = XFER_DMAADDR_INVALID;
|
|
|
|
xfer->tx_dma = XFER_DMAADDR_INVALID;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Map until end or first fail */
|
|
|
|
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
|
|
|
|
|
2010-09-29 08:31:31 +00:00
|
|
|
if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
|
|
|
|
continue;
|
|
|
|
|
2009-11-30 07:39:42 +00:00
|
|
|
if (xfer->tx_buf != NULL) {
|
2010-09-03 01:36:26 +00:00
|
|
|
xfer->tx_dma = dma_map_single(dev,
|
|
|
|
(void *)xfer->tx_buf, xfer->len,
|
|
|
|
DMA_TO_DEVICE);
|
2009-11-30 07:39:42 +00:00
|
|
|
if (dma_mapping_error(dev, xfer->tx_dma)) {
|
|
|
|
dev_err(dev, "dma_map_single Tx failed\n");
|
|
|
|
xfer->tx_dma = XFER_DMAADDR_INVALID;
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (xfer->rx_buf != NULL) {
|
|
|
|
xfer->rx_dma = dma_map_single(dev, xfer->rx_buf,
|
|
|
|
xfer->len, DMA_FROM_DEVICE);
|
|
|
|
if (dma_mapping_error(dev, xfer->rx_dma)) {
|
|
|
|
dev_err(dev, "dma_map_single Rx failed\n");
|
|
|
|
dma_unmap_single(dev, xfer->tx_dma,
|
|
|
|
xfer->len, DMA_TO_DEVICE);
|
|
|
|
xfer->tx_dma = XFER_DMAADDR_INVALID;
|
|
|
|
xfer->rx_dma = XFER_DMAADDR_INVALID;
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
|
|
|
|
struct spi_message *msg)
|
|
|
|
{
|
2010-09-29 08:31:31 +00:00
|
|
|
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
|
2009-11-30 07:39:42 +00:00
|
|
|
struct device *dev = &sdd->pdev->dev;
|
|
|
|
struct spi_transfer *xfer;
|
|
|
|
|
|
|
|
if (msg->is_dma_mapped)
|
|
|
|
return;
|
|
|
|
|
|
|
|
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
|
|
|
|
|
2010-09-29 08:31:31 +00:00
|
|
|
if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
|
|
|
|
continue;
|
|
|
|
|
2009-11-30 07:39:42 +00:00
|
|
|
if (xfer->rx_buf != NULL
|
|
|
|
&& xfer->rx_dma != XFER_DMAADDR_INVALID)
|
|
|
|
dma_unmap_single(dev, xfer->rx_dma,
|
|
|
|
xfer->len, DMA_FROM_DEVICE);
|
|
|
|
|
|
|
|
if (xfer->tx_buf != NULL
|
|
|
|
&& xfer->tx_dma != XFER_DMAADDR_INVALID)
|
|
|
|
dma_unmap_single(dev, xfer->tx_dma,
|
|
|
|
xfer->len, DMA_TO_DEVICE);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
|
|
|
|
struct spi_message *msg)
|
|
|
|
{
|
2010-01-20 20:49:44 +00:00
|
|
|
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
|
2009-11-30 07:39:42 +00:00
|
|
|
struct spi_device *spi = msg->spi;
|
|
|
|
struct s3c64xx_spi_csinfo *cs = spi->controller_data;
|
|
|
|
struct spi_transfer *xfer;
|
|
|
|
int status = 0, cs_toggle = 0;
|
|
|
|
u32 speed;
|
|
|
|
u8 bpw;
|
|
|
|
|
|
|
|
/* If Master's(controller) state differs from that needed by Slave */
|
|
|
|
if (sdd->cur_speed != spi->max_speed_hz
|
|
|
|
|| sdd->cur_mode != spi->mode
|
|
|
|
|| sdd->cur_bpw != spi->bits_per_word) {
|
|
|
|
sdd->cur_bpw = spi->bits_per_word;
|
|
|
|
sdd->cur_speed = spi->max_speed_hz;
|
|
|
|
sdd->cur_mode = spi->mode;
|
|
|
|
s3c64xx_spi_config(sdd);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Map all the transfers if needed */
|
|
|
|
if (s3c64xx_spi_map_mssg(sdd, msg)) {
|
|
|
|
dev_err(&spi->dev,
|
|
|
|
"Xfer: Unable to map message buffers!\n");
|
|
|
|
status = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Configure feedback delay */
|
|
|
|
writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
|
|
|
|
|
|
|
|
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
|
|
|
|
|
|
|
|
unsigned long flags;
|
|
|
|
int use_dma;
|
|
|
|
|
|
|
|
INIT_COMPLETION(sdd->xfer_completion);
|
|
|
|
|
|
|
|
/* Only BPW and Speed may change across transfers */
|
|
|
|
bpw = xfer->bits_per_word ? : spi->bits_per_word;
|
|
|
|
speed = xfer->speed_hz ? : spi->max_speed_hz;
|
|
|
|
|
2010-09-29 08:31:33 +00:00
|
|
|
if (xfer->len % (bpw / 8)) {
|
|
|
|
dev_err(&spi->dev,
|
|
|
|
"Xfer length(%u) not a multiple of word size(%u)\n",
|
|
|
|
xfer->len, bpw / 8);
|
|
|
|
status = -EIO;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2009-11-30 07:39:42 +00:00
|
|
|
if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
|
|
|
|
sdd->cur_bpw = bpw;
|
|
|
|
sdd->cur_speed = speed;
|
|
|
|
s3c64xx_spi_config(sdd);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Polling method for xfers not bigger than FIFO capacity */
|
|
|
|
if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
|
|
|
|
use_dma = 0;
|
|
|
|
else
|
|
|
|
use_dma = 1;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&sdd->lock, flags);
|
|
|
|
|
|
|
|
/* Pending only which is to be done */
|
|
|
|
sdd->state &= ~RXBUSY;
|
|
|
|
sdd->state &= ~TXBUSY;
|
|
|
|
|
|
|
|
enable_datapath(sdd, spi, xfer, use_dma);
|
|
|
|
|
|
|
|
/* Slave Select */
|
|
|
|
enable_cs(sdd, spi);
|
|
|
|
|
|
|
|
/* Start the signals */
|
|
|
|
S3C64XX_SPI_ACT(sdd);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
|
|
|
|
status = wait_for_xfer(sdd, xfer, use_dma);
|
|
|
|
|
|
|
|
/* Quiese the signals */
|
|
|
|
S3C64XX_SPI_DEACT(sdd);
|
|
|
|
|
|
|
|
if (status) {
|
2010-02-02 07:22:13 +00:00
|
|
|
dev_err(&spi->dev, "I/O Error: "
|
|
|
|
"rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
|
2009-11-30 07:39:42 +00:00
|
|
|
xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
|
|
|
|
(sdd->state & RXBUSY) ? 'f' : 'p',
|
|
|
|
(sdd->state & TXBUSY) ? 'f' : 'p',
|
|
|
|
xfer->len);
|
|
|
|
|
|
|
|
if (use_dma) {
|
|
|
|
if (xfer->tx_buf != NULL
|
|
|
|
&& (sdd->state & TXBUSY))
|
2011-09-02 00:44:42 +00:00
|
|
|
sdd->ops->stop(sdd->tx_dma.ch);
|
2009-11-30 07:39:42 +00:00
|
|
|
if (xfer->rx_buf != NULL
|
|
|
|
&& (sdd->state & RXBUSY))
|
2011-09-02 00:44:42 +00:00
|
|
|
sdd->ops->stop(sdd->rx_dma.ch);
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (xfer->delay_usecs)
|
|
|
|
udelay(xfer->delay_usecs);
|
|
|
|
|
|
|
|
if (xfer->cs_change) {
|
|
|
|
/* Hint that the next mssg is gonna be
|
|
|
|
for the same device */
|
|
|
|
if (list_is_last(&xfer->transfer_list,
|
|
|
|
&msg->transfers))
|
|
|
|
cs_toggle = 1;
|
|
|
|
else
|
|
|
|
disable_cs(sdd, spi);
|
|
|
|
}
|
|
|
|
|
|
|
|
msg->actual_length += xfer->len;
|
|
|
|
|
|
|
|
flush_fifo(sdd);
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
if (!cs_toggle || status)
|
|
|
|
disable_cs(sdd, spi);
|
|
|
|
else
|
|
|
|
sdd->tgl_spi = spi;
|
|
|
|
|
|
|
|
s3c64xx_spi_unmap_mssg(sdd, msg);
|
|
|
|
|
|
|
|
msg->status = status;
|
|
|
|
|
|
|
|
if (msg->complete)
|
|
|
|
msg->complete(msg->context);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void s3c64xx_spi_work(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct s3c64xx_spi_driver_data *sdd = container_of(work,
|
|
|
|
struct s3c64xx_spi_driver_data, work);
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
/* Acquire DMA channels */
|
|
|
|
while (!acquire_dma(sdd))
|
|
|
|
msleep(10);
|
|
|
|
|
|
|
|
spin_lock_irqsave(&sdd->lock, flags);
|
|
|
|
|
|
|
|
while (!list_empty(&sdd->queue)
|
|
|
|
&& !(sdd->state & SUSPND)) {
|
|
|
|
|
|
|
|
struct spi_message *msg;
|
|
|
|
|
|
|
|
msg = container_of(sdd->queue.next, struct spi_message, queue);
|
|
|
|
|
|
|
|
list_del_init(&msg->queue);
|
|
|
|
|
|
|
|
/* Set Xfer busy flag */
|
|
|
|
sdd->state |= SPIBUSY;
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
|
|
|
|
handle_msg(sdd, msg);
|
|
|
|
|
|
|
|
spin_lock_irqsave(&sdd->lock, flags);
|
|
|
|
|
|
|
|
sdd->state &= ~SPIBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
|
|
|
|
/* Free DMA channels */
|
2011-09-02 00:44:42 +00:00
|
|
|
sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);
|
|
|
|
sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);
|
2009-11-30 07:39:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int s3c64xx_spi_transfer(struct spi_device *spi,
|
|
|
|
struct spi_message *msg)
|
|
|
|
{
|
|
|
|
struct s3c64xx_spi_driver_data *sdd;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
sdd = spi_master_get_devdata(spi->master);
|
|
|
|
|
|
|
|
spin_lock_irqsave(&sdd->lock, flags);
|
|
|
|
|
|
|
|
if (sdd->state & SUSPND) {
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
return -ESHUTDOWN;
|
|
|
|
}
|
|
|
|
|
|
|
|
msg->status = -EINPROGRESS;
|
|
|
|
msg->actual_length = 0;
|
|
|
|
|
|
|
|
list_add_tail(&msg->queue, &sdd->queue);
|
|
|
|
|
|
|
|
queue_work(sdd->workqueue, &sdd->work);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Here we only check the validity of requested configuration
|
|
|
|
* and save the configuration in a local data-structure.
|
|
|
|
* The controller is actually configured only just before we
|
|
|
|
* get a message to transfer.
|
|
|
|
*/
|
|
|
|
static int s3c64xx_spi_setup(struct spi_device *spi)
|
|
|
|
{
|
|
|
|
struct s3c64xx_spi_csinfo *cs = spi->controller_data;
|
|
|
|
struct s3c64xx_spi_driver_data *sdd;
|
2010-01-20 20:49:44 +00:00
|
|
|
struct s3c64xx_spi_info *sci;
|
2009-11-30 07:39:42 +00:00
|
|
|
struct spi_message *msg;
|
|
|
|
unsigned long flags;
|
|
|
|
int err = 0;
|
|
|
|
|
|
|
|
if (cs == NULL || cs->set_level == NULL) {
|
|
|
|
dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
sdd = spi_master_get_devdata(spi->master);
|
|
|
|
sci = sdd->cntrlr_info;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&sdd->lock, flags);
|
|
|
|
|
|
|
|
list_for_each_entry(msg, &sdd->queue, queue) {
|
|
|
|
/* Is some mssg is already queued for this device */
|
|
|
|
if (msg->spi == spi) {
|
|
|
|
dev_err(&spi->dev,
|
|
|
|
"setup: attempt while mssg in queue!\n");
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sdd->state & SUSPND) {
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
dev_err(&spi->dev,
|
|
|
|
"setup: SPI-%d not active!\n", spi->master->bus_num);
|
|
|
|
return -ESHUTDOWN;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
|
|
|
|
if (spi->bits_per_word != 8
|
|
|
|
&& spi->bits_per_word != 16
|
|
|
|
&& spi->bits_per_word != 32) {
|
|
|
|
dev_err(&spi->dev, "setup: %dbits/wrd not supported!\n",
|
|
|
|
spi->bits_per_word);
|
|
|
|
err = -EINVAL;
|
|
|
|
goto setup_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if we can provide the requested rate */
|
2010-09-29 08:31:33 +00:00
|
|
|
if (!sci->clk_from_cmu) {
|
|
|
|
u32 psr, speed;
|
|
|
|
|
|
|
|
/* Max possible */
|
|
|
|
speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
|
|
|
|
|
|
|
|
if (spi->max_speed_hz > speed)
|
|
|
|
spi->max_speed_hz = speed;
|
|
|
|
|
|
|
|
psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
|
|
|
|
psr &= S3C64XX_SPI_PSR_MASK;
|
|
|
|
if (psr == S3C64XX_SPI_PSR_MASK)
|
|
|
|
psr--;
|
|
|
|
|
|
|
|
speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
|
|
|
|
if (spi->max_speed_hz < speed) {
|
|
|
|
if (psr+1 < S3C64XX_SPI_PSR_MASK) {
|
|
|
|
psr++;
|
|
|
|
} else {
|
|
|
|
err = -EINVAL;
|
|
|
|
goto setup_exit;
|
|
|
|
}
|
|
|
|
}
|
2009-11-30 07:39:42 +00:00
|
|
|
|
2010-09-29 08:31:33 +00:00
|
|
|
speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
|
|
|
|
if (spi->max_speed_hz >= speed)
|
|
|
|
spi->max_speed_hz = speed;
|
|
|
|
else
|
2009-11-30 07:39:42 +00:00
|
|
|
err = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
setup_exit:
|
|
|
|
|
|
|
|
/* setup() returns with device de-selected */
|
|
|
|
disable_cs(sdd, spi);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
|
|
|
|
{
|
2010-01-20 20:49:44 +00:00
|
|
|
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
|
2009-11-30 07:39:42 +00:00
|
|
|
void __iomem *regs = sdd->regs;
|
|
|
|
unsigned int val;
|
|
|
|
|
|
|
|
sdd->cur_speed = 0;
|
|
|
|
|
|
|
|
S3C64XX_SPI_DEACT(sdd);
|
|
|
|
|
|
|
|
/* Disable Interrupts - we use Polling if not DMA mode */
|
|
|
|
writel(0, regs + S3C64XX_SPI_INT_EN);
|
|
|
|
|
2010-09-29 08:31:33 +00:00
|
|
|
if (!sci->clk_from_cmu)
|
|
|
|
writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
|
2009-11-30 07:39:42 +00:00
|
|
|
regs + S3C64XX_SPI_CLK_CFG);
|
|
|
|
writel(0, regs + S3C64XX_SPI_MODE_CFG);
|
|
|
|
writel(0, regs + S3C64XX_SPI_PACKET_CNT);
|
|
|
|
|
|
|
|
/* Clear any irq pending bits */
|
|
|
|
writel(readl(regs + S3C64XX_SPI_PENDING_CLR),
|
|
|
|
regs + S3C64XX_SPI_PENDING_CLR);
|
|
|
|
|
|
|
|
writel(0, regs + S3C64XX_SPI_SWAP_CFG);
|
|
|
|
|
|
|
|
val = readl(regs + S3C64XX_SPI_MODE_CFG);
|
|
|
|
val &= ~S3C64XX_SPI_MODE_4BURST;
|
|
|
|
val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
|
|
|
|
val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
|
|
|
|
writel(val, regs + S3C64XX_SPI_MODE_CFG);
|
|
|
|
|
|
|
|
flush_fifo(sdd);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init s3c64xx_spi_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct resource *mem_res, *dmatx_res, *dmarx_res;
|
|
|
|
struct s3c64xx_spi_driver_data *sdd;
|
2010-01-20 20:49:44 +00:00
|
|
|
struct s3c64xx_spi_info *sci;
|
2009-11-30 07:39:42 +00:00
|
|
|
struct spi_master *master;
|
|
|
|
int ret;
|
2011-11-02 11:04:19 +00:00
|
|
|
char clk_name[16];
|
2009-11-30 07:39:42 +00:00
|
|
|
|
|
|
|
if (pdev->id < 0) {
|
|
|
|
dev_err(&pdev->dev,
|
|
|
|
"Invalid platform device id-%d\n", pdev->id);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (pdev->dev.platform_data == NULL) {
|
|
|
|
dev_err(&pdev->dev, "platform_data missing!\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
2010-09-01 14:55:22 +00:00
|
|
|
sci = pdev->dev.platform_data;
|
|
|
|
|
2009-11-30 07:39:42 +00:00
|
|
|
/* Check for availability of necessary resource */
|
|
|
|
|
|
|
|
dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
|
|
|
|
if (dmatx_res == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Unable to get SPI-Tx dma resource\n");
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
|
|
|
|
if (dmarx_res == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Unable to get SPI-Rx dma resource\n");
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (mem_res == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Unable to get SPI MEM resource\n");
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
master = spi_alloc_master(&pdev->dev,
|
|
|
|
sizeof(struct s3c64xx_spi_driver_data));
|
|
|
|
if (master == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, master);
|
|
|
|
|
|
|
|
sdd = spi_master_get_devdata(master);
|
|
|
|
sdd->master = master;
|
|
|
|
sdd->cntrlr_info = sci;
|
|
|
|
sdd->pdev = pdev;
|
|
|
|
sdd->sfr_start = mem_res->start;
|
2011-09-02 00:44:42 +00:00
|
|
|
sdd->tx_dma.dmach = dmatx_res->start;
|
|
|
|
sdd->tx_dma.direction = DMA_TO_DEVICE;
|
|
|
|
sdd->rx_dma.dmach = dmarx_res->start;
|
|
|
|
sdd->rx_dma.direction = DMA_FROM_DEVICE;
|
2009-11-30 07:39:42 +00:00
|
|
|
|
|
|
|
sdd->cur_bpw = 8;
|
|
|
|
|
|
|
|
master->bus_num = pdev->id;
|
|
|
|
master->setup = s3c64xx_spi_setup;
|
|
|
|
master->transfer = s3c64xx_spi_transfer;
|
|
|
|
master->num_chipselect = sci->num_cs;
|
|
|
|
master->dma_alignment = 8;
|
|
|
|
/* the spi->mode bits understood by this driver: */
|
|
|
|
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
|
|
|
|
|
|
|
|
if (request_mem_region(mem_res->start,
|
|
|
|
resource_size(mem_res), pdev->name) == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Req mem region failed\n");
|
|
|
|
ret = -ENXIO;
|
|
|
|
goto err0;
|
|
|
|
}
|
|
|
|
|
|
|
|
sdd->regs = ioremap(mem_res->start, resource_size(mem_res));
|
|
|
|
if (sdd->regs == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Unable to remap IO\n");
|
|
|
|
ret = -ENXIO;
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sci->cfg_gpio == NULL || sci->cfg_gpio(pdev)) {
|
|
|
|
dev_err(&pdev->dev, "Unable to config gpio\n");
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto err2;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Setup clocks */
|
|
|
|
sdd->clk = clk_get(&pdev->dev, "spi");
|
|
|
|
if (IS_ERR(sdd->clk)) {
|
|
|
|
dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n");
|
|
|
|
ret = PTR_ERR(sdd->clk);
|
|
|
|
goto err3;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (clk_enable(sdd->clk)) {
|
|
|
|
dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n");
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto err4;
|
|
|
|
}
|
|
|
|
|
2011-11-02 11:04:19 +00:00
|
|
|
sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr);
|
|
|
|
sdd->src_clk = clk_get(&pdev->dev, clk_name);
|
2010-01-20 20:49:44 +00:00
|
|
|
if (IS_ERR(sdd->src_clk)) {
|
2009-11-30 07:39:42 +00:00
|
|
|
dev_err(&pdev->dev,
|
2011-11-02 11:04:19 +00:00
|
|
|
"Unable to acquire clock '%s'\n", clk_name);
|
2010-01-20 20:49:44 +00:00
|
|
|
ret = PTR_ERR(sdd->src_clk);
|
2009-11-30 07:39:42 +00:00
|
|
|
goto err5;
|
|
|
|
}
|
|
|
|
|
2010-01-20 20:49:44 +00:00
|
|
|
if (clk_enable(sdd->src_clk)) {
|
2011-11-02 11:04:19 +00:00
|
|
|
dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name);
|
2009-11-30 07:39:42 +00:00
|
|
|
ret = -EBUSY;
|
|
|
|
goto err6;
|
|
|
|
}
|
|
|
|
|
|
|
|
sdd->workqueue = create_singlethread_workqueue(
|
|
|
|
dev_name(master->dev.parent));
|
|
|
|
if (sdd->workqueue == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Unable to create workqueue\n");
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto err7;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Setup Deufult Mode */
|
|
|
|
s3c64xx_spi_hwinit(sdd, pdev->id);
|
|
|
|
|
|
|
|
spin_lock_init(&sdd->lock);
|
|
|
|
init_completion(&sdd->xfer_completion);
|
|
|
|
INIT_WORK(&sdd->work, s3c64xx_spi_work);
|
|
|
|
INIT_LIST_HEAD(&sdd->queue);
|
|
|
|
|
|
|
|
if (spi_register_master(master)) {
|
|
|
|
dev_err(&pdev->dev, "cannot register SPI master\n");
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto err8;
|
|
|
|
}
|
|
|
|
|
2010-02-02 07:22:13 +00:00
|
|
|
dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d "
|
|
|
|
"with %d Slaves attached\n",
|
2009-11-30 07:39:42 +00:00
|
|
|
pdev->id, master->num_chipselect);
|
2010-02-02 07:22:13 +00:00
|
|
|
dev_dbg(&pdev->dev, "\tIOmem=[0x%x-0x%x]\tDMA=[Rx-%d, Tx-%d]\n",
|
2009-11-30 07:39:42 +00:00
|
|
|
mem_res->end, mem_res->start,
|
2011-09-02 00:44:42 +00:00
|
|
|
sdd->rx_dma.dmach, sdd->tx_dma.dmach);
|
2009-11-30 07:39:42 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err8:
|
|
|
|
destroy_workqueue(sdd->workqueue);
|
|
|
|
err7:
|
2010-01-20 20:49:44 +00:00
|
|
|
clk_disable(sdd->src_clk);
|
2009-11-30 07:39:42 +00:00
|
|
|
err6:
|
2010-01-20 20:49:44 +00:00
|
|
|
clk_put(sdd->src_clk);
|
2009-11-30 07:39:42 +00:00
|
|
|
err5:
|
|
|
|
clk_disable(sdd->clk);
|
|
|
|
err4:
|
|
|
|
clk_put(sdd->clk);
|
|
|
|
err3:
|
|
|
|
err2:
|
|
|
|
iounmap((void *) sdd->regs);
|
|
|
|
err1:
|
|
|
|
release_mem_region(mem_res->start, resource_size(mem_res));
|
|
|
|
err0:
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
spi_master_put(master);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int s3c64xx_spi_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
|
|
|
|
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
|
|
|
|
struct resource *mem_res;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&sdd->lock, flags);
|
|
|
|
sdd->state |= SUSPND;
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
|
|
|
|
while (sdd->state & SPIBUSY)
|
|
|
|
msleep(10);
|
|
|
|
|
|
|
|
spi_unregister_master(master);
|
|
|
|
|
|
|
|
destroy_workqueue(sdd->workqueue);
|
|
|
|
|
2010-01-20 20:49:44 +00:00
|
|
|
clk_disable(sdd->src_clk);
|
|
|
|
clk_put(sdd->src_clk);
|
2009-11-30 07:39:42 +00:00
|
|
|
|
|
|
|
clk_disable(sdd->clk);
|
|
|
|
clk_put(sdd->clk);
|
|
|
|
|
|
|
|
iounmap((void *) sdd->regs);
|
|
|
|
|
|
|
|
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
2010-01-20 20:49:44 +00:00
|
|
|
if (mem_res != NULL)
|
|
|
|
release_mem_region(mem_res->start, resource_size(mem_res));
|
2009-11-30 07:39:42 +00:00
|
|
|
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
spi_master_put(master);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int s3c64xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
|
|
|
|
{
|
|
|
|
struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
|
|
|
|
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&sdd->lock, flags);
|
|
|
|
sdd->state |= SUSPND;
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
|
|
|
|
while (sdd->state & SPIBUSY)
|
|
|
|
msleep(10);
|
|
|
|
|
|
|
|
/* Disable the clock */
|
2010-01-20 20:49:44 +00:00
|
|
|
clk_disable(sdd->src_clk);
|
2009-11-30 07:39:42 +00:00
|
|
|
clk_disable(sdd->clk);
|
|
|
|
|
|
|
|
sdd->cur_speed = 0; /* Output Clock is stopped */
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int s3c64xx_spi_resume(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
|
|
|
|
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
|
2010-01-20 20:49:44 +00:00
|
|
|
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
|
2009-11-30 07:39:42 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
sci->cfg_gpio(pdev);
|
|
|
|
|
|
|
|
/* Enable the clock */
|
2010-01-20 20:49:44 +00:00
|
|
|
clk_enable(sdd->src_clk);
|
2009-11-30 07:39:42 +00:00
|
|
|
clk_enable(sdd->clk);
|
|
|
|
|
|
|
|
s3c64xx_spi_hwinit(sdd, pdev->id);
|
|
|
|
|
|
|
|
spin_lock_irqsave(&sdd->lock, flags);
|
|
|
|
sdd->state &= ~SUSPND;
|
|
|
|
spin_unlock_irqrestore(&sdd->lock, flags);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
#define s3c64xx_spi_suspend NULL
|
|
|
|
#define s3c64xx_spi_resume NULL
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
|
|
|
|
static struct platform_driver s3c64xx_spi_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "s3c64xx-spi",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
.remove = s3c64xx_spi_remove,
|
|
|
|
.suspend = s3c64xx_spi_suspend,
|
|
|
|
.resume = s3c64xx_spi_resume,
|
|
|
|
};
|
|
|
|
MODULE_ALIAS("platform:s3c64xx-spi");
|
|
|
|
|
|
|
|
static int __init s3c64xx_spi_init(void)
|
|
|
|
{
|
|
|
|
return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe);
|
|
|
|
}
|
2010-09-07 10:29:17 +00:00
|
|
|
subsys_initcall(s3c64xx_spi_init);
|
2009-11-30 07:39:42 +00:00
|
|
|
|
|
|
|
static void __exit s3c64xx_spi_exit(void)
|
|
|
|
{
|
|
|
|
platform_driver_unregister(&s3c64xx_spi_driver);
|
|
|
|
}
|
|
|
|
module_exit(s3c64xx_spi_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
|
|
|
|
MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
|
|
|
|
MODULE_LICENSE("GPL");
|