spi/topcliff: cleanups for style and conciseness
This patch makes multiple cleanups to the new topcliff pch spi driver including, but not limited to, - removing superfluous brackets around variables - open coding functions that are only used once - removing unnecessary line breaks - removing unused functions - simplifying the interrupt enable/disable code - remove unnecessary (void *) casts. - remove b_mem_fail from pch_spi_set_tx to code it more cleanly - shorten dev_dbg() messages for conciseness and readability More cleanups are still needed in this driver. In particular, - the driver filename should be changed to spi_topcliff_pch.c - many of the dev_dbg() lines should be trimmed (particularly the ones on unconditional code paths). - I suspect that the locking model not correct. I'd like to know what drivers' critical regions are, and how they are protected. - get_resources and release_resources probably should be open coded in .probe and .release respectively. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely
parent
e8b17b5b3f
commit
65308c46b7
1 changed files with 138 additions and 364 deletions
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@ -1,8 +1,6 @@
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/*
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* SPI bus driver for the Topcliff PCH used by Intel SoCs
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*/
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/*
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*
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* Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
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*
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* This program is free software; you can redistribute it and/or modify
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@ -19,6 +17,7 @@
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/wait.h>
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#include <linux/spi/spi.h>
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@ -45,17 +44,7 @@
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#define PCH_RX_THOLD 7
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#define PCH_RX_THOLD_MAX 15
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#define PCH_RX 1
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#define PCH_TX 2
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/* various interrupts */
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#define PCH_TFI 0x1
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#define PCH_RFI 0x2
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#define PCH_FI 0x4
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#define PCH_ORI 0x8
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#define PCH_MDFI 0x10
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#define PCH_ALL (PCH_TFI|PCH_RFI|PCH_FI|PCH_ORI|PCH_MDFI)
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#define PCH_MAX_BAUDRATE 5000000
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#define PCH_MAX_FIFO_DEPTH 16
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@ -86,6 +75,8 @@
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#define SPSR_FI_BIT (1 << 2)
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#define SPBRR_SIZE_BIT (1 << 10)
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#define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|SPCR_ORIE_BIT|SPCR_MDFIE_BIT)
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#define SPCR_RFIC_FIELD 20
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#define SPCR_TFIC_FIELD 16
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@ -176,16 +167,6 @@ static struct pci_device_id pch_spi_pcidev_id[] = {
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{0,}
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};
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static inline void pch_set_bitmsk(u32 *var, u32 bitmask)
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{
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*var |= bitmask;
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}
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static inline void pch_clr_bitmsk(u32 *var, u32 bitmask)
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{
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*var &= (~(bitmask));
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}
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/**
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* pch_spi_writereg() - Performs register writes
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* @master: Pointer to struct spi_master.
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@ -194,9 +175,7 @@ static inline void pch_clr_bitmsk(u32 *var, u32 bitmask)
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*/
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static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val)
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{
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struct pch_spi_data *data = spi_master_get_devdata(master);
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iowrite32(val, (data->io_remap_addr + idx));
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}
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@ -208,19 +187,9 @@ static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val)
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static inline u32 pch_spi_readreg(struct spi_master *master, int idx)
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{
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struct pch_spi_data *data = spi_master_get_devdata(master);
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return ioread32(data->io_remap_addr + idx);
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}
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/* ope==true:Set bit, ope==false:Clear bit */
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static inline void pch_spi_setclr_bit(u32 *val, u32 pos, bool ope)
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{
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if (ope)
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*val |= pos;
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else
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*val &= (~(pos));
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}
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static inline void pch_spi_setclr_reg(struct spi_master *master, int idx,
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u32 set, u32 clr)
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{
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@ -229,7 +198,6 @@ static inline void pch_spi_setclr_reg(struct spi_master *master, int idx,
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pch_spi_writereg(master, idx, tmp);
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}
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static void pch_spi_set_master_mode(struct spi_master *master)
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{
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pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0);
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@ -245,35 +213,6 @@ static void pch_spi_clear_fifo(struct spi_master *master)
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pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT);
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}
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/**
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* ch_spi_disable_interrupts() - Disables specified interrupts
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* @master: Pointer to struct spi_master.
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* @interrupt: Interrups to be enabled.
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*/
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static void pch_spi_disable_interrupts(struct spi_master *master, u8 interrupt)
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{
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u32 clr_flags = 0;
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if (interrupt & PCH_RFI)
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clr_flags |= SPCR_RFIE_BIT;
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if (interrupt & PCH_TFI)
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clr_flags |= SPCR_TFIE_BIT;
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if (interrupt & PCH_FI)
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clr_flags |= SPCR_FIE_BIT;
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if (interrupt & PCH_ORI)
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clr_flags |= SPCR_ORIE_BIT;
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if (interrupt & PCH_MDFI)
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clr_flags |= SPCR_MDFIE_BIT;
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pch_spi_setclr_reg(master, PCH_SPCR, 0, clr_flags);
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dev_dbg(&master->dev, "%s clearing bits =%x\n", __func__, clr_flags);
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}
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static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
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void __iomem *io_remap_addr)
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{
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@ -309,9 +248,7 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
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/* disable RFI if not needed */
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if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) {
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reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR);
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/* disable RFI */
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pch_clr_bitmsk(®_spcr_val, SPCR_RFIE_BIT);
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reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */
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/* reset rx threshold */
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reg_spcr_val &= MASK_RFIC_SPCR_BITS;
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@ -329,7 +266,8 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
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/* if transfer complete interrupt */
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if (reg_spsr_val & SPSR_FI_BIT) {
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/* disable FI & RFI interrupts */
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pch_spi_disable_interrupts(data->master, PCH_FI | PCH_RFI);
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pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
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SPCR_FIE_BIT | SPCR_TFIE_BIT);
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/* transfer is completed;inform pch_spi_process_messages */
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data->transfer_complete = true;
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@ -337,7 +275,6 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
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}
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}
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/**
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* pch_spi_handler() - Interrupt handler
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* @irq: The interrupt number.
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@ -350,7 +287,6 @@ static irqreturn_t pch_spi_handler(int irq, void *dev_id)
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void __iomem *spsr;
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void __iomem *io_remap_addr;
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irqreturn_t ret = IRQ_NONE;
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struct pch_spi_board_data *board_dat = dev_id;
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if (board_dat->suspend_sts) {
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@ -366,7 +302,6 @@ static irqreturn_t pch_spi_handler(int irq, void *dev_id)
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reg_spsr_val = ioread32(spsr);
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/* Check if the interrupt is for SPI device */
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if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) {
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pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr);
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ret = IRQ_HANDLED;
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@ -385,12 +320,9 @@ static irqreturn_t pch_spi_handler(int irq, void *dev_id)
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*/
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static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz)
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{
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u32 n_spbr;
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n_spbr = PCH_CLOCK_HZ / (speed_hz * 2);
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u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2);
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/* if baud rate is less than we can support limit it */
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if (n_spbr > PCH_MAX_SPBR)
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n_spbr = PCH_MAX_SPBR;
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@ -417,105 +349,29 @@ static void pch_spi_set_bits_per_word(struct spi_master *master,
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*/
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static void pch_spi_setup_transfer(struct spi_device *spi)
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{
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u32 reg_spcr_val;
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u32 flags = 0;
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dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n",
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__func__, pch_spi_readreg(spi->master, PCH_SPBRR),
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spi->max_speed_hz);
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pch_spi_set_baud_rate(spi->master, spi->max_speed_hz);
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/* set bits per word */
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pch_spi_set_bits_per_word(spi->master, spi->bits_per_word);
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if (spi->mode & SPI_LSB_FIRST)
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pch_spi_setclr_reg(spi->master, PCH_SPCR, 0, SPCR_LSBF_BIT);
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else
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pch_spi_setclr_reg(spi->master, PCH_SPCR, SPCR_LSBF_BIT, 0);
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if (!(spi->mode & SPI_LSB_FIRST))
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flags |= SPCR_LSBF_BIT;
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if (spi->mode & SPI_CPOL)
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pch_spi_setclr_reg(spi->master, PCH_SPCR, SPCR_CPOL_BIT, 0);
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else
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pch_spi_setclr_reg(spi->master, PCH_SPCR, 0, SPCR_CPOL_BIT);
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flags |= SPCR_CPOL_BIT;
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if (spi->mode & SPI_CPHA)
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pch_spi_setclr_reg(spi->master, PCH_SPCR, SPCR_CPHA_BIT, 0);
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else
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pch_spi_setclr_reg(spi->master, PCH_SPCR, 0, SPCR_CPHA_BIT);
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dev_dbg(&spi->dev,
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"%s SPCR content after setting LSB/MSB and MODE= %x\n",
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__func__, reg_spcr_val);
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flags |= SPCR_CPHA_BIT;
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pch_spi_setclr_reg(spi->master, PCH_SPCR, flags,
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(SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT));
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/* Clear the FIFO by toggling FICLR to 1 and back to 0 */
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pch_spi_clear_fifo(spi->master);
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}
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/**
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* pch_spi_enable_interrupts() - Enables specified interrupts
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* @master: Pointer to struct spi_master.
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* @interrupt: Interrups to be enabled.
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*/
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static void pch_spi_enable_interrupts(struct spi_master *master, u8 interrupt)
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{
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u32 reg_val_spcr;
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dev_dbg(&master->dev, "%s SPCR content=%x\n", __func__, reg_val_spcr);
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if (interrupt & PCH_RFI) {
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/* set RFIE bit in SPCR */
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dev_dbg(&master->dev, "setting RFI in %s\n", __func__);
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pch_spi_setclr_reg(master, PCH_SPCR, SPCR_RFIE_BIT, 0);
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}
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if (interrupt & PCH_TFI) {
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/* set TFIE bit in SPCR */
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dev_dbg(&master->dev, "setting TFI in %s\n", __func__);
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pch_spi_setclr_reg(master, PCH_SPCR, SPCR_TFIE_BIT, 0);
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}
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if (interrupt & PCH_FI) {
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/* set FIE bit in SPCR */
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dev_dbg(&master->dev, "setting FI in %s\n", __func__);
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pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FIE_BIT, 0);
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}
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if (interrupt & PCH_ORI) {
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/* set ORIE bit in SPCR */
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dev_dbg(&master->dev, "setting ORI in %s\n", __func__);
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pch_spi_setclr_reg(master, PCH_SPCR, SPCR_ORIE_BIT, 0);
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}
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if (interrupt & PCH_MDFI) {
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/* set MODFIE bit in SPCR */
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dev_dbg(&master->dev, "setting MDFI in %s\n", __func__);
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pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MDFIE_BIT, 0);
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}
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}
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/**
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* pch_spi_set_threshold() - Sets Tx/Rx FIFO thresholds
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* @spi: Pointer to struct spi_device.
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* @threshold: Threshold value to be set.
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* @dir: Rx or Tx threshold to be set.
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*/
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static void pch_spi_set_threshold(struct spi_device *spi, u32 threshold, u8 dir)
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{
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if (dir == PCH_RX) {
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dev_dbg(&spi->dev, "%s setting Rx threshold\n", __func__);
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pch_spi_setclr_reg(spi->master, PCH_SPCR,
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threshold << SPCR_RFIC_FIELD,
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~MASK_RFIC_SPCR_BITS);
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} else if (dir == PCH_TX) {
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dev_dbg(&spi->dev, "%s setting Tx threshold\n", __func__);
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pch_spi_setclr_reg(spi->master, PCH_SPCR,
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(threshold << SPCR_TFIC_FIELD) ,
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~MASK_TFIC_SPCR_BITS);
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}
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}
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/**
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* pch_spi_reset() - Clears SPI registers
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* @master: Pointer to struct spi_master.
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@ -532,13 +388,12 @@ static void pch_spi_reset(struct spi_master *master)
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static int pch_spi_setup(struct spi_device *pspi)
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{
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/* check bits per word */
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if ((pspi->bits_per_word) == 0) {
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if (pspi->bits_per_word == 0) {
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pspi->bits_per_word = 8;
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dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__);
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}
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if (((pspi->bits_per_word) != 8) &&
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((pspi->bits_per_word != 16))) {
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if ((pspi->bits_per_word != 8) && (pspi->bits_per_word != 16)) {
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dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__);
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return -EINVAL;
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}
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@ -550,7 +405,7 @@ static int pch_spi_setup(struct spi_device *pspi)
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pspi->max_speed_hz = PCH_MAX_BAUDRATE;
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dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__,
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((pspi->mode) & (SPI_CPOL | SPI_CPHA)));
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(pspi->mode) & (SPI_CPOL | SPI_CPHA));
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return 0;
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}
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@ -564,17 +419,15 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
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unsigned long flags;
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/* validate spi message and baud rate */
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if (unlikely((list_empty(&pmsg->transfers) == 1) ||
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(pspi->max_speed_hz == 0))) {
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if (list_empty(&pmsg->transfers) == 1)
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dev_err(&pspi->dev, "%s list empty\n", __func__);
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if ((pspi->max_speed_hz) == 0) {
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dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n",
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__func__, pspi->max_speed_hz);
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}
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dev_err(&pspi->dev, "%s returning EINVAL\n", __func__);
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if (unlikely(list_empty(&pmsg->transfers) == 1)) {
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dev_err(&pspi->dev, "%s list empty\n", __func__);
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retval = -EINVAL;
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goto err_out;
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}
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if (unlikely(pspi->max_speed_hz == 0)) {
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dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n",
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__func__, pspi->max_speed_hz);
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retval = -EINVAL;
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goto err_out;
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}
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@ -582,32 +435,28 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
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dev_dbg(&pspi->dev, "%s Transfer List not empty. "
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"Transfer Speed is set.\n", __func__);
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spin_lock_irqsave(&data->lock, flags);
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/* validate Tx/Rx buffers and Transfer length */
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list_for_each_entry(transfer, &pmsg->transfers, transfer_list) {
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if ((!(transfer->tx_buf)) && (!(transfer->rx_buf))) {
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if (!transfer->tx_buf && !transfer->rx_buf) {
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dev_err(&pspi->dev,
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"%s Tx and Rx buffer NULL\n", __func__);
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retval = -EINVAL;
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goto err_return_spinlock;
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goto err_out;
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}
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if (!(transfer->len)) {
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if (!transfer->len) {
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dev_err(&pspi->dev, "%s Transfer length invalid\n",
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__func__);
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retval = -EINVAL;
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goto err_return_spinlock;
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goto err_out;
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}
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dev_dbg(&pspi->dev, "%s Tx/Rx buffer valid. Transfer length"
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" valid\n", __func__);
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/* if baud rate hs been specified validate the same */
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if (transfer->speed_hz) {
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if ((transfer->speed_hz) > PCH_MAX_BAUDRATE)
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transfer->speed_hz = PCH_MAX_BAUDRATE;
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}
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if (transfer->speed_hz > PCH_MAX_BAUDRATE)
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transfer->speed_hz = PCH_MAX_BAUDRATE;
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|
||||
/* if bits per word has been specified validate the same */
|
||||
if (transfer->bits_per_word) {
|
||||
|
|
@ -616,14 +465,15 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
|
|||
retval = -EINVAL;
|
||||
dev_err(&pspi->dev,
|
||||
"%s Invalid bits per word\n", __func__);
|
||||
goto err_return_spinlock;
|
||||
goto err_out;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* We won't process any messages if we have been asked to terminate */
|
||||
spin_lock_irqsave(&data->lock, flags);
|
||||
|
||||
if (STATUS_EXITING == (data->status)) {
|
||||
/* We won't process any messages if we have been asked to terminate */
|
||||
if (data->status == STATUS_EXITING) {
|
||||
dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__);
|
||||
retval = -ESHUTDOWN;
|
||||
goto err_return_spinlock;
|
||||
|
|
@ -631,27 +481,23 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
|
|||
|
||||
/* If suspended ,return -EINVAL */
|
||||
if (data->board_dat->suspend_sts) {
|
||||
dev_err(&pspi->dev,
|
||||
"%s bSuspending= true returning EINVAL\n", __func__);
|
||||
dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__);
|
||||
retval = -EINVAL;
|
||||
goto err_return_spinlock;
|
||||
}
|
||||
|
||||
/* set status of message */
|
||||
pmsg->actual_length = 0;
|
||||
|
||||
dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status);
|
||||
|
||||
pmsg->status = -EINPROGRESS;
|
||||
|
||||
/* add message to queue */
|
||||
list_add_tail(&pmsg->queue, &data->queue);
|
||||
|
||||
dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
|
||||
|
||||
/* schedule work queue to run */
|
||||
queue_work(data->wk, &data->work);
|
||||
|
||||
dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
|
||||
|
||||
retval = 0;
|
||||
|
|
@ -666,10 +512,9 @@ err_out:
|
|||
static inline void pch_spi_select_chip(struct pch_spi_data *data,
|
||||
struct spi_device *pspi)
|
||||
{
|
||||
if ((data->current_chip) != NULL) {
|
||||
if ((pspi->chip_select) != (data->n_curnt_chip)) {
|
||||
dev_dbg(&pspi->dev,
|
||||
"%s : different slave-Invoking\n", __func__);
|
||||
if (data->current_chip != NULL) {
|
||||
if (pspi->chip_select != data->n_curnt_chip) {
|
||||
dev_dbg(&pspi->dev, "%s : different slave\n", __func__);
|
||||
data->current_chip = NULL;
|
||||
}
|
||||
}
|
||||
|
|
@ -683,9 +528,8 @@ static inline void pch_spi_select_chip(struct pch_spi_data *data,
|
|||
}
|
||||
|
||||
static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw,
|
||||
struct spi_message **ppmsg)
|
||||
struct spi_message **ppmsg)
|
||||
{
|
||||
int b_mem_fail;
|
||||
int size;
|
||||
u32 n_writes;
|
||||
int j;
|
||||
|
|
@ -697,20 +541,16 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw,
|
|||
|
||||
/* set baud rate if needed */
|
||||
if (data->cur_trans->speed_hz) {
|
||||
dev_dbg(&data->master->dev,
|
||||
"%s:pctrldatasetting baud rate\n", __func__);
|
||||
pch_spi_set_baud_rate(data->master,
|
||||
(data->cur_trans->speed_hz));
|
||||
dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
|
||||
pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
|
||||
}
|
||||
|
||||
/* set bits per word if needed */
|
||||
if ((data->cur_trans->bits_per_word) &&
|
||||
((data->current_msg->spi->bits_per_word) !=
|
||||
(data->cur_trans->bits_per_word))) {
|
||||
dev_dbg(&data->master->dev,
|
||||
"%s:setting bits per word\n", __func__);
|
||||
if (data->cur_trans->bits_per_word &&
|
||||
(data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) {
|
||||
dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
|
||||
pch_spi_set_bits_per_word(data->master,
|
||||
(data->cur_trans->bits_per_word));
|
||||
data->cur_trans->bits_per_word);
|
||||
*bpw = data->cur_trans->bits_per_word;
|
||||
} else {
|
||||
*bpw = data->current_msg->spi->bits_per_word;
|
||||
|
|
@ -721,28 +561,21 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw,
|
|||
data->rx_index = 0;
|
||||
|
||||
data->bpw_len = data->cur_trans->len / (*bpw / 8);
|
||||
b_mem_fail = false;
|
||||
|
||||
/* find alloc size */
|
||||
size = (data->cur_trans->len) * (sizeof(*(data->pkt_tx_buff)));
|
||||
size = data->cur_trans->len * sizeof(*data->pkt_tx_buff);
|
||||
|
||||
/* allocate memory for pkt_tx_buff & pkt_rx_buffer */
|
||||
data->pkt_tx_buff = kzalloc(size, GFP_KERNEL);
|
||||
|
||||
if (data->pkt_tx_buff != NULL) {
|
||||
data->pkt_rx_buff = kzalloc(size, GFP_KERNEL);
|
||||
|
||||
if (data->pkt_rx_buff == NULL) {
|
||||
b_mem_fail = true;
|
||||
if (!data->pkt_rx_buff)
|
||||
kfree(data->pkt_tx_buff);
|
||||
}
|
||||
} else {
|
||||
b_mem_fail = true;
|
||||
}
|
||||
|
||||
if (b_mem_fail) {
|
||||
if (!data->pkt_rx_buff) {
|
||||
/* flush queue and set status of all transfers to -ENOMEM */
|
||||
dev_err(&data->master->dev,
|
||||
"Kzalloc fail in %s messages\n", __func__);
|
||||
dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__);
|
||||
list_for_each_entry(pmsg, data->queue.next, queue) {
|
||||
pmsg->status = -ENOMEM;
|
||||
|
||||
|
|
@ -752,39 +585,33 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw,
|
|||
/* delete from queue */
|
||||
list_del_init(&pmsg->queue);
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
/* copy Tx Data */
|
||||
if ((data->cur_trans->tx_buf) != NULL) {
|
||||
if (data->cur_trans->tx_buf != NULL) {
|
||||
if (*bpw == 8) {
|
||||
for (j = 0; j < (data->bpw_len); j++) {
|
||||
tx_buf = data->cur_trans->tx_buf;
|
||||
data->pkt_tx_buff[j] = tx_buf[j];
|
||||
}
|
||||
tx_buf = data->cur_trans->tx_buf;
|
||||
for (j = 0; j < data->bpw_len; j++)
|
||||
data->pkt_tx_buff[j] = *tx_buf++;
|
||||
} else {
|
||||
for (j = 0; j < (data->bpw_len); j++) {
|
||||
tx_sbuf = data->cur_trans->tx_buf;
|
||||
data->pkt_tx_buff[j] = tx_sbuf[j];
|
||||
}
|
||||
tx_sbuf = data->cur_trans->tx_buf;
|
||||
for (j = 0; j < data->bpw_len; j++)
|
||||
data->pkt_tx_buff[j] = *tx_sbuf++;
|
||||
}
|
||||
}
|
||||
|
||||
/* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */
|
||||
if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH)
|
||||
n_writes = data->bpw_len;
|
||||
if (n_writes > PCH_MAX_FIFO_DEPTH)
|
||||
n_writes = PCH_MAX_FIFO_DEPTH;
|
||||
else
|
||||
n_writes = (data->bpw_len);
|
||||
|
||||
dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
|
||||
dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
|
||||
"0x2 to SSNXCR\n", __func__);
|
||||
pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
|
||||
|
||||
for (j = 0; j < n_writes; j++) {
|
||||
pch_spi_writereg(data->master, PCH_SPDWR,
|
||||
data->pkt_tx_buff[j]);
|
||||
}
|
||||
for (j = 0; j < n_writes; j++)
|
||||
pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]);
|
||||
|
||||
/* update tx_index */
|
||||
data->tx_index = j;
|
||||
|
|
@ -798,13 +625,12 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw,
|
|||
static void pch_spi_nomore_transfer(struct pch_spi_data *data,
|
||||
struct spi_message *pmsg)
|
||||
{
|
||||
dev_dbg(&data->master->dev,
|
||||
"%s:no more transfers in this message\n", __func__);
|
||||
dev_dbg(&data->master->dev, "%s called\n", __func__);
|
||||
/* Invoke complete callback
|
||||
[To the spi core..indicating end of transfer] */
|
||||
* [To the spi core..indicating end of transfer] */
|
||||
data->current_msg->status = 0;
|
||||
|
||||
if ((data->current_msg->complete) != 0) {
|
||||
if (data->current_msg->complete != 0) {
|
||||
dev_dbg(&data->master->dev,
|
||||
"%s:Invoking callback of SPI core\n", __func__);
|
||||
data->current_msg->complete(data->current_msg->context);
|
||||
|
|
@ -819,28 +645,26 @@ static void pch_spi_nomore_transfer(struct pch_spi_data *data,
|
|||
data->current_msg = NULL;
|
||||
data->cur_trans = NULL;
|
||||
|
||||
/* check if we have items in list and not suspending */
|
||||
/* return 1 if list empty */
|
||||
/* check if we have items in list and not suspending
|
||||
* return 1 if list empty */
|
||||
if ((list_empty(&data->queue) == 0) &&
|
||||
(!(data->board_dat->suspend_sts))
|
||||
&& (data->status != STATUS_EXITING)) {
|
||||
(!data->board_dat->suspend_sts) &&
|
||||
(data->status != STATUS_EXITING)) {
|
||||
/* We have some more work to do (either there is more tranint
|
||||
bpw;sfer requests in the current message or there are
|
||||
more messages)
|
||||
*/
|
||||
dev_dbg(&data->master->dev,
|
||||
"%s:we have pending messages-Invoking queue_work\n",
|
||||
__func__);
|
||||
* bpw;sfer requests in the current message or there are
|
||||
*more messages)
|
||||
*/
|
||||
dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__);
|
||||
queue_work(data->wk, &data->work);
|
||||
} else if ((data->board_dat->suspend_sts) ||
|
||||
(data->status == STATUS_EXITING)) {
|
||||
} else if (data->board_dat->suspend_sts ||
|
||||
data->status == STATUS_EXITING) {
|
||||
dev_dbg(&data->master->dev,
|
||||
"%s suspend/remove initiated, flushing queue\n",
|
||||
__func__);
|
||||
list_for_each_entry(pmsg, data->queue.next, queue) {
|
||||
pmsg->status = -EIO;
|
||||
|
||||
if (pmsg->complete != 0)
|
||||
if (pmsg->complete)
|
||||
pmsg->complete(pmsg->context);
|
||||
|
||||
/* delete from queue */
|
||||
|
|
@ -851,30 +675,29 @@ static void pch_spi_nomore_transfer(struct pch_spi_data *data,
|
|||
|
||||
static void pch_spi_set_ir(struct pch_spi_data *data)
|
||||
{
|
||||
u32 reg_spcr_val;
|
||||
|
||||
/* enable interrupts */
|
||||
if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) {
|
||||
/* set receive threhold to PCH_RX_THOLD */
|
||||
pch_spi_set_threshold(data->current_chip, PCH_RX_THOLD, PCH_RX);
|
||||
pch_spi_setclr_reg(data->master, PCH_SPCR,
|
||||
PCH_RX_THOLD << SPCR_TFIC_FIELD,
|
||||
~MASK_TFIC_SPCR_BITS);
|
||||
/* enable FI and RFI interrupts */
|
||||
pch_spi_enable_interrupts(data->master, PCH_RFI | PCH_FI);
|
||||
pch_spi_setclr_reg(data->master, PCH_SPCR,
|
||||
SPCR_RFIE_BIT | SPCR_TFIE_BIT, 0);
|
||||
} else {
|
||||
/* set receive threhold to maximum */
|
||||
pch_spi_set_threshold(data->current_chip, PCH_RX_THOLD_MAX,
|
||||
PCH_RX);
|
||||
pch_spi_setclr_reg(data->master, PCH_SPCR,
|
||||
PCH_RX_THOLD_MAX << SPCR_TFIC_FIELD,
|
||||
~MASK_TFIC_SPCR_BITS);
|
||||
/* enable FI interrupt */
|
||||
pch_spi_enable_interrupts(data->master, PCH_FI);
|
||||
pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_FIE_BIT, 0);
|
||||
}
|
||||
|
||||
dev_dbg(&data->master->dev,
|
||||
"%s:invoking pch_spi_set_enable to enable SPI\n", __func__);
|
||||
|
||||
/* SPI set enable */
|
||||
reg_spcr_val = pch_spi_readreg(data->current_chip->master, PCH_SPCR);
|
||||
pch_set_bitmsk(®_spcr_val, SPCR_SPE_BIT);
|
||||
pch_spi_writereg(data->current_chip->master, PCH_SPCR, reg_spcr_val);
|
||||
|
||||
pch_spi_setclr_reg(data->current_chip->master, PCH_SPCR, SPCR_SPE_BIT, 0);
|
||||
|
||||
/* Wait until the transfer completes; go to sleep after
|
||||
initiating the transfer. */
|
||||
|
|
@ -893,9 +716,9 @@ static void pch_spi_set_ir(struct pch_spi_data *data)
|
|||
|
||||
/* clear all interrupts */
|
||||
pch_spi_writereg(data->master, PCH_SPSR,
|
||||
(pch_spi_readreg(data->master, PCH_SPSR)));
|
||||
pch_spi_readreg(data->master, PCH_SPSR));
|
||||
/* disable interrupts */
|
||||
pch_spi_disable_interrupts(data->master, PCH_ALL);
|
||||
pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
|
||||
}
|
||||
|
||||
static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
|
||||
|
|
@ -905,19 +728,17 @@ static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
|
|||
u16 *rx_sbuf;
|
||||
|
||||
/* copy Rx Data */
|
||||
if (!(data->cur_trans->rx_buf))
|
||||
if (!data->cur_trans->rx_buf)
|
||||
return;
|
||||
|
||||
if (bpw == 8) {
|
||||
for (j = 0; j < (data->bpw_len); j++) {
|
||||
rx_buf = data->cur_trans->rx_buf;
|
||||
rx_buf[j] = (data->pkt_rx_buff[j]) & 0xFF;
|
||||
}
|
||||
rx_buf = data->cur_trans->rx_buf;
|
||||
for (j = 0; j < data->bpw_len; j++)
|
||||
*rx_buf++ = data->pkt_rx_buff[j] & 0xFF;
|
||||
} else {
|
||||
for (j = 0; j < (data->bpw_len); j++) {
|
||||
rx_sbuf = data->cur_trans->rx_buf;
|
||||
rx_sbuf[j] = data->pkt_rx_buff[j];
|
||||
}
|
||||
rx_sbuf = data->cur_trans->rx_buf;
|
||||
for (j = 0; j < data->bpw_len; j++)
|
||||
*rx_sbuf++ = data->pkt_rx_buff[j];
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -925,20 +746,20 @@ static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
|
|||
static void pch_spi_process_messages(struct work_struct *pwork)
|
||||
{
|
||||
struct spi_message *pmsg;
|
||||
struct pch_spi_data *data;
|
||||
int bpw;
|
||||
|
||||
struct pch_spi_data *data =
|
||||
container_of(pwork, struct pch_spi_data, work);
|
||||
dev_dbg(&data->master->dev, "%s data initialized\n", __func__);
|
||||
data = container_of(pwork, struct pch_spi_data, work);
|
||||
|
||||
spin_lock(&data->lock);
|
||||
|
||||
/* check if suspend has been initiated;if yes flush queue */
|
||||
if ((data->board_dat->suspend_sts) ||
|
||||
(data->status == STATUS_EXITING)) {
|
||||
if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) {
|
||||
dev_dbg(&data->master->dev,
|
||||
"%s suspend/remove initiated,flushing queue\n",
|
||||
__func__);
|
||||
|
||||
list_for_each_entry(pmsg, data->queue.next, queue) {
|
||||
pmsg->status = -EIO;
|
||||
|
||||
|
|
@ -961,8 +782,8 @@ static void pch_spi_process_messages(struct work_struct *pwork)
|
|||
"%s Set data->bcurrent_msg_processing= true\n", __func__);
|
||||
|
||||
/* Get the message from the queue and delete it from there. */
|
||||
data->current_msg =
|
||||
list_entry(data->queue.next, struct spi_message, queue);
|
||||
data->current_msg = list_entry(data->queue.next, struct spi_message,
|
||||
queue);
|
||||
|
||||
list_del_init(&data->current_msg->queue);
|
||||
|
||||
|
|
@ -1044,7 +865,7 @@ static void pch_spi_process_messages(struct work_struct *pwork)
|
|||
|
||||
spin_unlock(&data->lock);
|
||||
|
||||
} while ((data->cur_trans) != NULL);
|
||||
} while (data->cur_trans != NULL);
|
||||
}
|
||||
|
||||
static void pch_spi_free_resources(struct pch_spi_board_data *board_dat)
|
||||
|
|
@ -1063,14 +884,11 @@ static void pch_spi_free_resources(struct pch_spi_board_data *board_dat)
|
|||
/* disable interrupts & free IRQ */
|
||||
if (board_dat->irq_reg_sts) {
|
||||
/* disable interrupts */
|
||||
pch_spi_disable_interrupts(board_dat->data->
|
||||
master, PCH_ALL);
|
||||
dev_dbg(&board_dat->pdev->dev,
|
||||
"%s pch_spi_disable_interrupts invoked "
|
||||
"successfully\n", __func__);
|
||||
pch_spi_setclr_reg(board_dat->data->master, PCH_SPCR, 0,
|
||||
PCH_ALL);
|
||||
|
||||
/* free IRQ */
|
||||
free_irq(board_dat->pdev->irq, (void *)board_dat);
|
||||
free_irq(board_dat->pdev->irq, board_dat);
|
||||
|
||||
dev_dbg(&board_dat->pdev->dev,
|
||||
"%s free_irq invoked successfully\n", __func__);
|
||||
|
|
@ -1079,7 +897,7 @@ static void pch_spi_free_resources(struct pch_spi_board_data *board_dat)
|
|||
}
|
||||
|
||||
/* unmap PCI base address */
|
||||
if ((board_dat->data->io_remap_addr) != 0) {
|
||||
if (board_dat->data->io_remap_addr != 0) {
|
||||
pci_iounmap(board_dat->pdev, board_dat->data->io_remap_addr);
|
||||
|
||||
board_dat->data->io_remap_addr = 0;
|
||||
|
|
@ -1104,26 +922,9 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat)
|
|||
int retval;
|
||||
dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
|
||||
|
||||
/* iniatize queue of pending messages */
|
||||
INIT_LIST_HEAD(&(board_dat->data->queue));
|
||||
|
||||
/* initialize spin locks */
|
||||
spin_lock_init(&(board_dat->data->lock));
|
||||
|
||||
/* set channel status */
|
||||
board_dat->data->status = STATUS_RUNNING;
|
||||
|
||||
/* initialize work structure */
|
||||
INIT_WORK(&(board_dat->data->work),
|
||||
pch_spi_process_messages);
|
||||
|
||||
/* initialize wait queues */
|
||||
init_waitqueue_head(&(board_dat->data->wait));
|
||||
|
||||
/* create workqueue */
|
||||
board_dat->data->wk = create_singlethread_workqueue(KBUILD_MODNAME);
|
||||
|
||||
if ((board_dat->data->wk) == NULL) {
|
||||
if (!board_dat->data->wk) {
|
||||
dev_err(&board_dat->pdev->dev,
|
||||
"%s create_singlet hread_workqueue failed\n", __func__);
|
||||
retval = -EBUSY;
|
||||
|
|
@ -1143,7 +944,6 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat)
|
|||
board_dat->pci_req_sts = true;
|
||||
|
||||
io_remap_addr = pci_iomap(board_dat->pdev, 1, 0);
|
||||
|
||||
if (io_remap_addr == 0) {
|
||||
dev_err(&board_dat->pdev->dev,
|
||||
"%s pci_iomap failed\n", __func__);
|
||||
|
|
@ -1161,7 +961,7 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat)
|
|||
|
||||
/* register IRQ */
|
||||
retval = request_irq(board_dat->pdev->irq, pch_spi_handler,
|
||||
IRQF_SHARED, KBUILD_MODNAME, (void *)board_dat);
|
||||
IRQF_SHARED, KBUILD_MODNAME, board_dat);
|
||||
if (retval != 0) {
|
||||
dev_err(&board_dat->pdev->dev,
|
||||
"%s request_irq failed\n", __func__);
|
||||
|
|
@ -1172,8 +972,7 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat)
|
|||
__func__, retval);
|
||||
|
||||
board_dat->irq_reg_sts = true;
|
||||
dev_dbg(&board_dat->pdev->dev,
|
||||
"%s data->irq_reg_sts=true\n", __func__);
|
||||
dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__);
|
||||
|
||||
err_return:
|
||||
if (retval != 0) {
|
||||
|
|
@ -1187,38 +986,6 @@ err_return:
|
|||
return retval;
|
||||
}
|
||||
|
||||
static int pch_spi_check_request_pending(struct pch_spi_board_data *board_dat)
|
||||
{
|
||||
int sts;
|
||||
u16 count;
|
||||
|
||||
count = 500;
|
||||
spin_lock(&(board_dat->data->lock));
|
||||
board_dat->data->status = STATUS_EXITING;
|
||||
|
||||
while ((list_empty(&(board_dat->data->queue)) == 0) &&
|
||||
(--count)) {
|
||||
dev_dbg(&board_dat->pdev->dev,
|
||||
"%s :queue not empty\n", __func__);
|
||||
spin_unlock(&(board_dat->data->lock));
|
||||
msleep(PCH_SLEEP_TIME);
|
||||
spin_lock(&(board_dat->data->lock));
|
||||
}
|
||||
|
||||
spin_unlock(&(board_dat->data->lock));
|
||||
|
||||
if (count) {
|
||||
sts = 0;
|
||||
dev_dbg(&board_dat->pdev->dev, "%s :queue empty\n", __func__);
|
||||
} else {
|
||||
sts = -EBUSY;
|
||||
}
|
||||
|
||||
dev_dbg(&board_dat->pdev->dev, "%s : EXIT=%d\n", __func__, sts);
|
||||
|
||||
return sts;
|
||||
}
|
||||
|
||||
static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
||||
{
|
||||
|
||||
|
|
@ -1279,12 +1046,17 @@ static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
|||
board_dat->data->master = master;
|
||||
board_dat->data->n_curnt_chip = 255;
|
||||
board_dat->data->board_dat = board_dat;
|
||||
board_dat->data->status = STATUS_RUNNING;
|
||||
|
||||
INIT_LIST_HEAD(&board_dat->data->queue);
|
||||
spin_lock_init(&board_dat->data->lock);
|
||||
INIT_WORK(&board_dat->data->work, pch_spi_process_messages);
|
||||
init_waitqueue_head(&board_dat->data->wait);
|
||||
|
||||
/* allocate resources for PCH SPI */
|
||||
retval = pch_spi_get_resources(board_dat);
|
||||
if (retval != 0) {
|
||||
dev_err(&pdev->dev, "%s fail(retval=%d)\n",
|
||||
__func__, retval);
|
||||
if (retval) {
|
||||
dev_err(&pdev->dev, "%s fail(retval=%d)\n", __func__, retval);
|
||||
goto err_spi_get_resources;
|
||||
}
|
||||
|
||||
|
|
@ -1292,7 +1064,7 @@ static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
|||
__func__, retval);
|
||||
|
||||
/* save private data in dev */
|
||||
pci_set_drvdata(pdev, (void *)board_dat);
|
||||
pci_set_drvdata(pdev, board_dat);
|
||||
dev_dbg(&pdev->dev, "%s invoked pci_set_drvdata\n", __func__);
|
||||
|
||||
/* set master mode */
|
||||
|
|
@ -1329,6 +1101,7 @@ err_kmalloc:
|
|||
static void pch_spi_remove(struct pci_dev *pdev)
|
||||
{
|
||||
struct pch_spi_board_data *board_dat = pci_get_drvdata(pdev);
|
||||
int count;
|
||||
|
||||
dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
|
||||
|
||||
|
|
@ -1338,19 +1111,23 @@ static void pch_spi_remove(struct pci_dev *pdev)
|
|||
return;
|
||||
}
|
||||
|
||||
/* check for any pending messages */
|
||||
if ((-EBUSY) == pch_spi_check_request_pending(board_dat)) {
|
||||
dev_dbg(&pdev->dev,
|
||||
"%s pch_spi_check_request_pending returned"
|
||||
" EBUSY\n", __func__);
|
||||
/* no need to take any particular action; proceed with remove
|
||||
even though queue is not empty */
|
||||
/* check for any pending messages; no action is taken if the queue
|
||||
* is still full; but at least we tried. Unload anyway */
|
||||
count = 500;
|
||||
spin_lock(&board_dat->data->lock);
|
||||
board_dat->data->status = STATUS_EXITING;
|
||||
while ((list_empty(&board_dat->data->queue) == 0) && --count) {
|
||||
dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n",
|
||||
__func__);
|
||||
spin_unlock(&board_dat->data->lock);
|
||||
msleep(PCH_SLEEP_TIME);
|
||||
spin_lock(&board_dat->data->lock);
|
||||
}
|
||||
spin_unlock(&board_dat->data->lock);
|
||||
|
||||
/* Free resources allocated for PCH SPI */
|
||||
pch_spi_free_resources(board_dat);
|
||||
|
||||
/* Unregister SPI master */
|
||||
spi_unregister_master(board_dat->data->master);
|
||||
|
||||
/* free memory for private data */
|
||||
|
|
@ -1401,13 +1178,11 @@ static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
|
|||
/* Free IRQ */
|
||||
if (board_dat->irq_reg_sts) {
|
||||
/* disable all interrupts */
|
||||
pch_spi_disable_interrupts(board_dat->data->master, PCH_ALL);
|
||||
pch_spi_setclr_reg(board_dat->data->master, PCH_SPCR, 0,
|
||||
PCH_ALL);
|
||||
pch_spi_reset(board_dat->data->master);
|
||||
dev_dbg(&pdev->dev,
|
||||
"%s pch_spi_disable_interrupts invoked successfully\n",
|
||||
__func__);
|
||||
|
||||
free_irq(board_dat->pdev->irq, (void *)board_dat);
|
||||
free_irq(board_dat->pdev->irq, board_dat);
|
||||
|
||||
board_dat->irq_reg_sts = false;
|
||||
dev_dbg(&pdev->dev,
|
||||
|
|
@ -1471,7 +1246,7 @@ static int pch_spi_resume(struct pci_dev *pdev)
|
|||
pci_enable_wake(pdev, PCI_D3hot, 0);
|
||||
|
||||
/* register IRQ handler */
|
||||
if (!(board->irq_reg_sts)) {
|
||||
if (!board->irq_reg_sts) {
|
||||
/* register IRQ */
|
||||
retval = request_irq(board->pdev->irq, pch_spi_handler,
|
||||
IRQF_SHARED, KBUILD_MODNAME,
|
||||
|
|
@ -1518,7 +1293,6 @@ static int __init pch_spi_init(void)
|
|||
}
|
||||
module_init(pch_spi_init);
|
||||
|
||||
|
||||
static void __exit pch_spi_exit(void)
|
||||
{
|
||||
pci_unregister_driver(&pch_spi_pcidev);
|
||||
|
|
@ -1526,4 +1300,4 @@ static void __exit pch_spi_exit(void)
|
|||
module_exit(pch_spi_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("PCH SPI PCI Driver");
|
||||
MODULE_DESCRIPTION("Topcliff PCH SPI PCI Driver");
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue