Re: [PATCH v2 1/5] spi/omap: Remove bus_num usage for instance index

From: DebBarma, Tarun Kanti
Date: Wed Mar 28 2012 - 04:50:58 EST

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In reply to: Shubhrajyoti D: "[PATCH v2 1/5] spi/omap: Remove bus_num usage for instance index"
Next in thread: Shubhrajyoti Datta: "Re: [PATCH v2 1/5] spi/omap: Remove bus_num usage for instance index"
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On Mon, Mar 26, 2012 at 7:14 PM, Shubhrajyoti D <shubhrajyoti@xxxxxx> wrote:
> From: Benoit Cousson <b-cousson@xxxxxx>
>
> bus_num was used to reference the mcspi controller instance in a fixed array.
> Remove this array and store this information directly inside drvdata structure.
>
> bus_num is now just set if the pdev->id is present or with -1 for dynamic
> allocation by SPI core, but the driver does not access it anymore.
>
> Clean some bad comments format, and remove un-needed space.
>
> Signed-off-by: Benoit Cousson <b-cousson@xxxxxx>
> [Cleanup the OMAP2_MCSPI_MAX_CTRL macro as it is not needed anymore]
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@xxxxxx>
> ---
> drivers/spi/spi-omap2-mcspi.c | 75 ++++++++++++++++++----------------------
> 1 files changed, 34 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
> index bb9274c..7785091 100644
> --- a/drivers/spi/spi-omap2-mcspi.c
> +++ b/drivers/spi/spi-omap2-mcspi.c
> @@ -45,9 +45,6 @@
>
> #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_SYSSTATUS 0x14
> #define OMAP2_MCSPI_IRQSTATUS 0x18
> @@ -111,6 +108,16 @@ struct omap2_mcspi_dma {
> #define DMA_MIN_BYTES 160
>
>
> +/*
> + * Used for context save and restore, structure members to be updated whenever
> + * corresponding registers are modified.
> + */
> +struct omap2_mcspi_regs {
> + u32 modulctrl;
> + u32 wakeupenable;
> + struct list_head cs;
> +};
> +
> struct omap2_mcspi {
> struct work_struct work;
> /* lock protects queue and registers */
> @@ -122,8 +129,9 @@ struct omap2_mcspi {
> unsigned long phys;
> /* SPI1 has 4 channels, while SPI2 has 2 */
> struct omap2_mcspi_dma *dma_channels;
> - struct device *dev;
> + struct device *dev;
> struct workqueue_struct *wq;
> + struct omap2_mcspi_regs ctx;
> };
>
> struct omap2_mcspi_cs {
> @@ -135,17 +143,6 @@ struct omap2_mcspi_cs {
> u32 chconf0;
> };
>
> -/* used for context save and restore, structure members to be updated whenever
> - * corresponding registers are modified.
> - */
> -struct omap2_mcspi_regs {
> - u32 modulctrl;
> - u32 wakeupenable;
> - struct list_head cs;
> -};
> -
> -static struct omap2_mcspi_regs omap2_mcspi_ctx[OMAP2_MCSPI_MAX_CTRL];
> -
> #define MOD_REG_BIT(val, mask, set) do { \
> if (set) \
> val |= mask; \
> @@ -236,9 +233,12 @@ static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
>
> static void omap2_mcspi_set_master_mode(struct spi_master *master)
> {
> + struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
> + struct omap2_mcspi_regs *ctx = &mcspi->ctx;
> u32 l;
>
> - /* setup when switching from (reset default) slave mode
> + /*
> + * Setup when switching from (reset default) slave mode
> * to single-channel master mode
> */
> l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
> @@ -247,24 +247,20 @@ static void omap2_mcspi_set_master_mode(struct spi_master *master)
> 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;
> + ctx->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;
> + struct spi_master *spi_cntrl = mcspi->master;
> + struct omap2_mcspi_regs *ctx = &mcspi->ctx;
> + struct omap2_mcspi_cs *cs;
>
> /* 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_MODULCTRL, ctx->modulctrl);
> + mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable);
>
> - 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)
> + list_for_each_entry(cs, &ctx->cs, node)
> __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
> }
> static void omap2_mcspi_disable_clocks(struct omap2_mcspi *mcspi)
> @@ -777,7 +773,8 @@ static int omap2_mcspi_request_dma(struct spi_device *spi)
> static int omap2_mcspi_setup(struct spi_device *spi)
> {
> int ret;
> - struct omap2_mcspi *mcspi;
> + struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
> + struct omap2_mcspi_regs *ctx = &mcspi->ctx;
> struct omap2_mcspi_dma *mcspi_dma;
> struct omap2_mcspi_cs *cs = spi->controller_state;
>
> @@ -787,7 +784,6 @@ static int omap2_mcspi_setup(struct spi_device *spi)
> return -EINVAL;
> }
>
> - mcspi = spi_master_get_devdata(spi->master);
> mcspi_dma = &mcspi->dma_channels[spi->chip_select];
>
> if (!cs) {
> @@ -799,8 +795,7 @@ static int omap2_mcspi_setup(struct spi_device *spi)
> 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);
> + list_add_tail(&cs->node, &ctx->cs);
> }
>
> if (mcspi_dma->dma_rx_channel == -1
> @@ -1053,8 +1048,9 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
> static int __init omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
> {
> struct spi_master *master = mcspi->master;
> + struct omap2_mcspi_regs *ctx = &mcspi->ctx;
> u32 tmp;
> - int ret = 0;
> + int ret = 0;
>
> ret = omap2_mcspi_enable_clocks(mcspi);
> if (ret < 0)
> @@ -1062,7 +1058,7 @@ static int __init omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
>
> tmp = OMAP2_MCSPI_WAKEUPENABLE_WKEN;
> mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, tmp);
> - omap2_mcspi_ctx[master->bus_num - 1].wakeupenable = tmp;
> + ctx->wakeupenable = tmp;
Can't we get rid of tmp now? For example:
ctx->wakeupenable = OMAP2_MCSPI_WAKEUPENABLE_WKEN;
mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable);
--
Tarun

>
> omap2_mcspi_set_master_mode(master);
> omap2_mcspi_disable_clocks(mcspi);
> @@ -1109,7 +1105,6 @@ static int __init omap2_mcspi_probe(struct platform_device *pdev)
> struct omap2_mcspi *mcspi;
> struct resource *r;
> int status = 0, i;
> - char wq_name[20];
> u32 regs_offset = 0;
> static int bus_num = 1;
> struct device_node *node = pdev->dev.of_node;
> @@ -1150,8 +1145,7 @@ static int __init omap2_mcspi_probe(struct platform_device *pdev)
> mcspi = spi_master_get_devdata(master);
> mcspi->master = master;
>
> - sprintf(wq_name, "omap2_mcspi/%d", master->bus_num);
> - mcspi->wq = alloc_workqueue(wq_name, WQ_MEM_RECLAIM, 1);
> + mcspi->wq = alloc_workqueue(dev_name(&pdev->dev), WQ_MEM_RECLAIM, 1);
> if (mcspi->wq == NULL) {
> status = -ENOMEM;
> goto free_master;
> @@ -1184,7 +1178,7 @@ 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);
> + INIT_LIST_HEAD(&mcspi->ctx.cs);
>
> mcspi->dma_channels = kcalloc(master->num_chipselect,
> sizeof(struct omap2_mcspi_dma),
> @@ -1291,13 +1285,12 @@ static int omap2_mcspi_resume(struct device *dev)
> {
> struct spi_master *master = dev_get_drvdata(dev);
> struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
> - struct omap2_mcspi_cs *cs;
> + struct omap2_mcspi_regs *ctx = &mcspi->ctx;
> + struct omap2_mcspi_cs *cs;
>
> omap2_mcspi_enable_clocks(mcspi);
> - list_for_each_entry(cs, &omap2_mcspi_ctx[master->bus_num - 1].cs,
> - node) {
> + list_for_each_entry(cs, &ctx->cs, node) {
> if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) {
> -
> /*
> * We need to toggle CS state for OMAP take this
> * change in account.
> --
> 1.7.1
>
> --
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Next message: Tony Vroon: "Re: [git pull] drm main pull for 3.4-rc1"
Previous message: Wolfram Sang: "Re: [PATCH 12/13] Add a kerneldoc comment to spin_is_locked() thatdiscourages its usage"
In reply to: Shubhrajyoti D: "[PATCH v2 1/5] spi/omap: Remove bus_num usage for instance index"
Next in thread: Shubhrajyoti Datta: "Re: [PATCH v2 1/5] spi/omap: Remove bus_num usage for instance index"
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