diff options
Diffstat (limited to 'drivers/spi/omap2_mcspi.c')
| -rw-r--r-- | drivers/spi/omap2_mcspi.c | 210 |
1 files changed, 147 insertions, 63 deletions
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c index 9b80ad36dbb..ba1a872b221 100644 --- a/drivers/spi/omap2_mcspi.c +++ b/drivers/spi/omap2_mcspi.c @@ -41,6 +41,9 @@ #define OMAP2_MCSPI_MAX_FREQ 48000000 +/* OMAP2 has 3 SPI controllers, while OMAP3 has 4 */ +#define OMAP2_MCSPI_MAX_CTRL 4 + #define OMAP2_MCSPI_REVISION 0x00 #define OMAP2_MCSPI_SYSCONFIG 0x10 #define OMAP2_MCSPI_SYSSTATUS 0x14 @@ -59,40 +62,40 @@ /* per-register bitmasks: */ -#define OMAP2_MCSPI_SYSCONFIG_SMARTIDLE (2 << 3) -#define OMAP2_MCSPI_SYSCONFIG_ENAWAKEUP (1 << 2) -#define OMAP2_MCSPI_SYSCONFIG_AUTOIDLE (1 << 0) -#define OMAP2_MCSPI_SYSCONFIG_SOFTRESET (1 << 1) +#define OMAP2_MCSPI_SYSCONFIG_SMARTIDLE BIT(4) +#define OMAP2_MCSPI_SYSCONFIG_ENAWAKEUP BIT(2) +#define OMAP2_MCSPI_SYSCONFIG_AUTOIDLE BIT(0) +#define OMAP2_MCSPI_SYSCONFIG_SOFTRESET BIT(1) -#define OMAP2_MCSPI_SYSSTATUS_RESETDONE (1 << 0) +#define OMAP2_MCSPI_SYSSTATUS_RESETDONE BIT(0) -#define OMAP2_MCSPI_MODULCTRL_SINGLE (1 << 0) -#define OMAP2_MCSPI_MODULCTRL_MS (1 << 2) -#define OMAP2_MCSPI_MODULCTRL_STEST (1 << 3) +#define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0) +#define OMAP2_MCSPI_MODULCTRL_MS BIT(2) +#define OMAP2_MCSPI_MODULCTRL_STEST BIT(3) -#define OMAP2_MCSPI_CHCONF_PHA (1 << 0) -#define OMAP2_MCSPI_CHCONF_POL (1 << 1) +#define OMAP2_MCSPI_CHCONF_PHA BIT(0) +#define OMAP2_MCSPI_CHCONF_POL BIT(1) #define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2) -#define OMAP2_MCSPI_CHCONF_EPOL (1 << 6) +#define OMAP2_MCSPI_CHCONF_EPOL BIT(6) #define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7) -#define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY (0x01 << 12) -#define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY (0x02 << 12) +#define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12) +#define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13) #define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12) -#define OMAP2_MCSPI_CHCONF_DMAW (1 << 14) -#define OMAP2_MCSPI_CHCONF_DMAR (1 << 15) -#define OMAP2_MCSPI_CHCONF_DPE0 (1 << 16) -#define OMAP2_MCSPI_CHCONF_DPE1 (1 << 17) -#define OMAP2_MCSPI_CHCONF_IS (1 << 18) -#define OMAP2_MCSPI_CHCONF_TURBO (1 << 19) -#define OMAP2_MCSPI_CHCONF_FORCE (1 << 20) +#define OMAP2_MCSPI_CHCONF_DMAW BIT(14) +#define OMAP2_MCSPI_CHCONF_DMAR BIT(15) +#define OMAP2_MCSPI_CHCONF_DPE0 BIT(16) +#define OMAP2_MCSPI_CHCONF_DPE1 BIT(17) +#define OMAP2_MCSPI_CHCONF_IS BIT(18) +#define OMAP2_MCSPI_CHCONF_TURBO BIT(19) +#define OMAP2_MCSPI_CHCONF_FORCE BIT(20) -#define OMAP2_MCSPI_CHSTAT_RXS (1 << 0) -#define OMAP2_MCSPI_CHSTAT_TXS (1 << 1) -#define OMAP2_MCSPI_CHSTAT_EOT (1 << 2) +#define OMAP2_MCSPI_CHSTAT_RXS BIT(0) +#define OMAP2_MCSPI_CHSTAT_TXS BIT(1) +#define OMAP2_MCSPI_CHSTAT_EOT BIT(2) -#define OMAP2_MCSPI_CHCTRL_EN (1 << 0) +#define OMAP2_MCSPI_CHCTRL_EN BIT(0) -#define OMAP2_MCSPI_WAKEUPENABLE_WKEN (1 << 0) +#define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0) /* We have 2 DMA channels per CS, one for RX and one for TX */ struct omap2_mcspi_dma { @@ -131,8 +134,23 @@ struct omap2_mcspi_cs { void __iomem *base; unsigned long phys; int word_len; + struct list_head node; + /* Context save and restore shadow register */ + u32 chconf0; +}; + +/* used for context save and restore, structure members to be updated whenever + * corresponding registers are modified. + */ +struct omap2_mcspi_regs { + u32 sysconfig; + u32 modulctrl; + u32 wakeupenable; + struct list_head cs; }; +static struct omap2_mcspi_regs omap2_mcspi_ctx[OMAP2_MCSPI_MAX_CTRL]; + static struct workqueue_struct *omap2_mcspi_wq; #define MOD_REG_BIT(val, mask, set) do { \ @@ -172,12 +190,27 @@ static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx) return __raw_readl(cs->base + idx); } +static inline u32 mcspi_cached_chconf0(const struct spi_device *spi) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + + return cs->chconf0; +} + +static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + + cs->chconf0 = val; + mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val); +} + static void omap2_mcspi_set_dma_req(const struct spi_device *spi, int is_read, int enable) { u32 l, rw; - l = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); + l = mcspi_cached_chconf0(spi); if (is_read) /* 1 is read, 0 write */ rw = OMAP2_MCSPI_CHCONF_DMAR; @@ -185,7 +218,7 @@ static void omap2_mcspi_set_dma_req(const struct spi_device *spi, rw = OMAP2_MCSPI_CHCONF_DMAW; MOD_REG_BIT(l, rw, enable); - mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, l); + mcspi_write_chconf0(spi, l); } static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable) @@ -200,9 +233,9 @@ static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active) { u32 l; - l = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); + l = mcspi_cached_chconf0(spi); MOD_REG_BIT(l, OMAP2_MCSPI_CHCONF_FORCE, cs_active); - mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, l); + mcspi_write_chconf0(spi, l); } static void omap2_mcspi_set_master_mode(struct spi_master *master) @@ -217,6 +250,46 @@ static void omap2_mcspi_set_master_mode(struct spi_master *master) MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_MS, 0); MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_SINGLE, 1); mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l); + + omap2_mcspi_ctx[master->bus_num - 1].modulctrl = l; +} + +static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi) +{ + struct spi_master *spi_cntrl; + struct omap2_mcspi_cs *cs; + spi_cntrl = mcspi->master; + + /* McSPI: context restore */ + mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL, + omap2_mcspi_ctx[spi_cntrl->bus_num - 1].modulctrl); + + mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_SYSCONFIG, + omap2_mcspi_ctx[spi_cntrl->bus_num - 1].sysconfig); + + mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE, + omap2_mcspi_ctx[spi_cntrl->bus_num - 1].wakeupenable); + + list_for_each_entry(cs, &omap2_mcspi_ctx[spi_cntrl->bus_num - 1].cs, + node) + __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); +} +static void omap2_mcspi_disable_clocks(struct omap2_mcspi *mcspi) +{ + clk_disable(mcspi->ick); + clk_disable(mcspi->fck); +} + +static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi) +{ + if (clk_enable(mcspi->ick)) + return -ENODEV; + if (clk_enable(mcspi->fck)) + return -ENODEV; + + omap2_mcspi_restore_ctx(mcspi); + + return 0; } static unsigned @@ -357,7 +430,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) c = count; word_len = cs->word_len; - l = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); + l = mcspi_cached_chconf0(spi); l &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; /* We store the pre-calculated register addresses on stack to speed @@ -397,8 +470,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) * more word i/o: switch to rx+tx */ if (c == 0 && tx == NULL) - mcspi_write_cs_reg(spi, - OMAP2_MCSPI_CHCONF0, l); + mcspi_write_chconf0(spi, l); *rx++ = __raw_readl(rx_reg); #ifdef VERBOSE dev_dbg(&spi->dev, "read-%d %02x\n", @@ -436,8 +508,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) * more word i/o: switch to rx+tx */ if (c == 0 && tx == NULL) - mcspi_write_cs_reg(spi, - OMAP2_MCSPI_CHCONF0, l); + mcspi_write_chconf0(spi, l); *rx++ = __raw_readl(rx_reg); #ifdef VERBOSE dev_dbg(&spi->dev, "read-%d %04x\n", @@ -475,8 +546,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) * more word i/o: switch to rx+tx */ if (c == 0 && tx == NULL) - mcspi_write_cs_reg(spi, - OMAP2_MCSPI_CHCONF0, l); + mcspi_write_chconf0(spi, l); *rx++ = __raw_readl(rx_reg); #ifdef VERBOSE dev_dbg(&spi->dev, "read-%d %04x\n", @@ -505,10 +575,12 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi, { struct omap2_mcspi_cs *cs = spi->controller_state; struct omap2_mcspi *mcspi; + struct spi_master *spi_cntrl; u32 l = 0, div = 0; u8 word_len = spi->bits_per_word; mcspi = spi_master_get_devdata(spi->master); + spi_cntrl = mcspi->master; if (t != NULL && t->bits_per_word) word_len = t->bits_per_word; @@ -522,7 +594,7 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi, } else div = 15; - l = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); + l = mcspi_cached_chconf0(spi); /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS * REVISIT: this controller could support SPI_3WIRE mode. @@ -554,7 +626,7 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi, else l &= ~OMAP2_MCSPI_CHCONF_PHA; - mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, l); + mcspi_write_chconf0(spi, l); dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n", OMAP2_MCSPI_MAX_FREQ / (1 << div), @@ -647,7 +719,11 @@ static int omap2_mcspi_setup(struct spi_device *spi) return -ENOMEM; cs->base = mcspi->base + spi->chip_select * 0x14; cs->phys = mcspi->phys + spi->chip_select * 0x14; + cs->chconf0 = 0; spi->controller_state = cs; + /* Link this to context save list */ + list_add_tail(&cs->node, + &omap2_mcspi_ctx[mcspi->master->bus_num - 1].cs); } if (mcspi_dma->dma_rx_channel == -1 @@ -657,11 +733,11 @@ static int omap2_mcspi_setup(struct spi_device *spi) return ret; } - clk_enable(mcspi->ick); - clk_enable(mcspi->fck); + if (omap2_mcspi_enable_clocks(mcspi)) + return -ENODEV; + ret = omap2_mcspi_setup_transfer(spi, NULL); - clk_disable(mcspi->fck); - clk_disable(mcspi->ick); + omap2_mcspi_disable_clocks(mcspi); return ret; } @@ -670,10 +746,15 @@ static void omap2_mcspi_cleanup(struct spi_device *spi) { struct omap2_mcspi *mcspi; struct omap2_mcspi_dma *mcspi_dma; + struct omap2_mcspi_cs *cs; mcspi = spi_master_get_devdata(spi->master); mcspi_dma = &mcspi->dma_channels[spi->chip_select]; + /* Unlink controller state from context save list */ + cs = spi->controller_state; + list_del(&cs->node); + kfree(spi->controller_state); if (mcspi_dma->dma_rx_channel != -1) { @@ -693,8 +774,8 @@ static void omap2_mcspi_work(struct work_struct *work) mcspi = container_of(work, struct omap2_mcspi, work); spin_lock_irq(&mcspi->lock); - clk_enable(mcspi->ick); - clk_enable(mcspi->fck); + if (omap2_mcspi_enable_clocks(mcspi)) + goto out; /* We only enable one channel at a time -- the one whose message is * at the head of the queue -- although this controller would gladly @@ -741,13 +822,13 @@ static void omap2_mcspi_work(struct work_struct *work) cs_active = 1; } - chconf = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); + chconf = mcspi_cached_chconf0(spi); chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; if (t->tx_buf == NULL) chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY; else if (t->rx_buf == NULL) chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY; - mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, chconf); + mcspi_write_chconf0(spi, chconf); if (t->len) { unsigned count; @@ -796,9 +877,9 @@ static void omap2_mcspi_work(struct work_struct *work) spin_lock_irq(&mcspi->lock); } - clk_disable(mcspi->fck); - clk_disable(mcspi->ick); + omap2_mcspi_disable_clocks(mcspi); +out: spin_unlock_irq(&mcspi->lock); } @@ -885,8 +966,8 @@ static int __init omap2_mcspi_reset(struct omap2_mcspi *mcspi) struct spi_master *master = mcspi->master; u32 tmp; - clk_enable(mcspi->ick); - clk_enable(mcspi->fck); + if (omap2_mcspi_enable_clocks(mcspi)) + return -1; mcspi_write_reg(master, OMAP2_MCSPI_SYSCONFIG, OMAP2_MCSPI_SYSCONFIG_SOFTRESET); @@ -894,18 +975,18 @@ static int __init omap2_mcspi_reset(struct omap2_mcspi *mcspi) tmp = mcspi_read_reg(master, OMAP2_MCSPI_SYSSTATUS); } while (!(tmp & OMAP2_MCSPI_SYSSTATUS_RESETDONE)); - mcspi_write_reg(master, OMAP2_MCSPI_SYSCONFIG, - OMAP2_MCSPI_SYSCONFIG_AUTOIDLE | - OMAP2_MCSPI_SYSCONFIG_ENAWAKEUP | - OMAP2_MCSPI_SYSCONFIG_SMARTIDLE); + tmp = OMAP2_MCSPI_SYSCONFIG_AUTOIDLE | + OMAP2_MCSPI_SYSCONFIG_ENAWAKEUP | + OMAP2_MCSPI_SYSCONFIG_SMARTIDLE; + mcspi_write_reg(master, OMAP2_MCSPI_SYSCONFIG, tmp); + omap2_mcspi_ctx[master->bus_num - 1].sysconfig = tmp; - mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, - OMAP2_MCSPI_WAKEUPENABLE_WKEN); + tmp = OMAP2_MCSPI_WAKEUPENABLE_WKEN; + mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, tmp); + omap2_mcspi_ctx[master->bus_num - 1].wakeupenable = tmp; omap2_mcspi_set_master_mode(master); - - clk_disable(mcspi->fck); - clk_disable(mcspi->ick); + omap2_mcspi_disable_clocks(mcspi); return 0; } @@ -933,7 +1014,8 @@ static u8 __initdata spi2_txdma_id[] = { OMAP24XX_DMA_SPI2_TX1, }; -#if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX) +#if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX) \ + || defined(CONFIG_ARCH_OMAP4) static u8 __initdata spi3_rxdma_id[] = { OMAP24XX_DMA_SPI3_RX0, OMAP24XX_DMA_SPI3_RX1, @@ -945,7 +1027,7 @@ static u8 __initdata spi3_txdma_id[] = { }; #endif -#ifdef CONFIG_ARCH_OMAP3 +#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4) static u8 __initdata spi4_rxdma_id[] = { OMAP34XX_DMA_SPI4_RX0, }; @@ -975,14 +1057,15 @@ static int __init omap2_mcspi_probe(struct platform_device *pdev) txdma_id = spi2_txdma_id; num_chipselect = 2; break; -#if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP3) +#if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP3) \ + || defined(CONFIG_ARCH_OMAP4) case 3: rxdma_id = spi3_rxdma_id; txdma_id = spi3_txdma_id; num_chipselect = 2; break; #endif -#ifdef CONFIG_ARCH_OMAP3 +#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4) case 4: rxdma_id = spi4_rxdma_id; txdma_id = spi4_txdma_id; @@ -1038,6 +1121,7 @@ static int __init omap2_mcspi_probe(struct platform_device *pdev) spin_lock_init(&mcspi->lock); INIT_LIST_HEAD(&mcspi->msg_queue); + INIT_LIST_HEAD(&omap2_mcspi_ctx[master->bus_num - 1].cs); mcspi->ick = clk_get(&pdev->dev, "ick"); if (IS_ERR(mcspi->ick)) { |