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Date: Tue, 28 Dec 2010 23:49:37 -0700
From: Grant Likely <grant.likely@...retlab.ca>
To: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
Cc: David Brownell <dbrownell@...rs.sourceforge.net>,
spi-devel-general@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, qi.wang@...el.com,
yong.y.wang@...el.com, joel.clark@...el.com, kok.howg.ewe@...el.com
Subject: Re: [PATCH 1/3] spi_topcliff_pch: support new device ML7213
On Mon, Dec 27, 2010 at 08:23:45PM +0900, Tomoya MORINAGA wrote:
> Support ML7213 device of OKI SEMICONDUCTOR.
> ML7213 is companion chip of Intel Atom E6xx series for IVI(In-Vehicle Infotainment).
> ML7213 is completely compatible for Intel EG20T PCH.
>
> Signed-off-by: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
> ---
> drivers/spi/spi_topcliff_pch.c | 293 +++++++++++++++++++++++-----------------
Hi Tomoya,
As previously discussed on this list, I would like to see support for
multiple bus instances implemented differently. Rather than storing
the spi_master instances in an array in the pci device private data,
the pci device should register a separate platform_device for each spi
bus instance, and each of those bus instances should get bound to a
topcliff_spi_bus driver which doesn't need to have any special
knowledge about how many spi_master instances actually exist.
Basically, the way it is implemented in this patch isn't taking
advantage of the infrastructure and instance management provided by
the driver model.
g.
> 1 files changed, 172 insertions(+), 121 deletions(-)
>
> diff --git a/drivers/spi/spi_topcliff_pch.c b/drivers/spi/spi_topcliff_pch.c
> index 58e187f..18e077b 100644
> --- a/drivers/spi/spi_topcliff_pch.c
> +++ b/drivers/spi/spi_topcliff_pch.c
> @@ -35,6 +35,7 @@
> #define PCH_SPDRR 0x10 /* SPI read data register */
> #define PCH_SSNXCR 0x18 /* SSN Expand Control Register */
> #define PCH_SRST 0x1C /* SPI reset register */
> +#define PCH_SPI_ADDRESS_SIZE 0x20
>
> #define PCH_SPSR_TFD 0x000007C0
> #define PCH_SPSR_RFD 0x0000F800
> @@ -88,6 +89,16 @@
> #define PCH_CLOCK_HZ 50000000
> #define PCH_MAX_SPBR 1023
>
> +/* Definition for ML7213 by OKI SEMICONDUCTOR */
> +#define PCI_VENDOR_ID_ROHM 0x10DB
> +#define PCI_DEVICE_ID_ML7213_SPI 0x802c
> +
> +/*
> +Set the number of SPI instance max
> +Intel EG20T PCH : 1ch
> +OKI SEMICONDUCTOR ML7213 IOH : 2ch
> +*/
> +#define PCH_SPI_MAX_DEV 2
>
> /**
> * struct pch_spi_data - Holds the SPI channel specific details
> @@ -153,18 +164,21 @@ struct pch_spi_data {
> * @pci_req_sts: Status of pci_request_regions
> * @suspend_sts: Status of suspend
> * @data: Pointer to SPI channel data structure
> + * @num: The number of SPI device instance
> */
> struct pch_spi_board_data {
> struct pci_dev *pdev;
> u8 irq_reg_sts;
> u8 pci_req_sts;
> u8 suspend_sts;
> - struct pch_spi_data *data;
> + struct pch_spi_data *data[PCH_SPI_MAX_DEV];
> + int num;
> };
>
> static struct pci_device_id pch_spi_pcidev_id[] = {
> - {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_GE_SPI)},
> - {0,}
> + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI), 1, },
> + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, },
> + { }
> };
>
> /**
> @@ -267,7 +281,7 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
> if (reg_spsr_val & SPSR_FI_BIT) {
> /* disable FI & RFI interrupts */
> pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
> - SPCR_FIE_BIT | SPCR_TFIE_BIT);
> + SPCR_FIE_BIT | SPCR_RFIE_BIT);
>
> /* transfer is completed;inform pch_spi_process_messages */
> data->transfer_complete = true;
> @@ -288,6 +302,7 @@ static irqreturn_t pch_spi_handler(int irq, void *dev_id)
> void __iomem *io_remap_addr;
> irqreturn_t ret = IRQ_NONE;
> struct pch_spi_board_data *board_dat = dev_id;
> + int i;
>
> if (board_dat->suspend_sts) {
> dev_dbg(&board_dat->pdev->dev,
> @@ -295,21 +310,22 @@ static irqreturn_t pch_spi_handler(int irq, void *dev_id)
> return IRQ_NONE;
> }
>
> - data = board_dat->data;
> - io_remap_addr = data->io_remap_addr;
> - spsr = io_remap_addr + PCH_SPSR;
> + for (i = 0; i < board_dat->num; i++) {
> + data = board_dat->data[i];
> + io_remap_addr = data->io_remap_addr;
> + spsr = io_remap_addr + PCH_SPSR;
>
> - reg_spsr_val = ioread32(spsr);
> + reg_spsr_val = ioread32(spsr);
>
> - /* Check if the interrupt is for SPI device */
> - if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) {
> - pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr);
> - ret = IRQ_HANDLED;
> - }
> -
> - dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n",
> - __func__, ret);
> + /* Check if the interrupt is for SPI device */
> + if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) {
> + pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr);
> + ret = IRQ_HANDLED;
> + }
>
> + dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n",
> + __func__, ret);
> + }
> return ret;
> }
>
> @@ -679,11 +695,11 @@ static void pch_spi_set_ir(struct pch_spi_data *data)
> if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) {
> /* set receive threhold to PCH_RX_THOLD */
> pch_spi_setclr_reg(data->master, PCH_SPCR,
> - PCH_RX_THOLD << SPCR_TFIC_FIELD,
> - ~MASK_TFIC_SPCR_BITS);
> + PCH_RX_THOLD << SPCR_RFIC_FIELD,
> + ~MASK_RFIC_SPCR_BITS);
> /* enable FI and RFI interrupts */
> pch_spi_setclr_reg(data->master, PCH_SPCR,
> - SPCR_RFIE_BIT | SPCR_TFIE_BIT, 0);
> + SPCR_RFIE_BIT | SPCR_FIE_BIT, 0);
> } else {
> /* set receive threhold to maximum */
> pch_spi_setclr_reg(data->master, PCH_SPCR,
> @@ -870,37 +886,46 @@ static void pch_spi_process_messages(struct work_struct *pwork)
>
> static void pch_spi_free_resources(struct pch_spi_board_data *board_dat)
> {
> + int i;
> +
> dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
>
> /* free workqueue */
> - if (board_dat->data->wk != NULL) {
> - destroy_workqueue(board_dat->data->wk);
> - board_dat->data->wk = NULL;
> - dev_dbg(&board_dat->pdev->dev,
> - "%s destroy_workqueue invoked successfully\n",
> - __func__);
> + for (i = 0; i < board_dat->num; i++) {
> + if (board_dat->data[i]->wk != NULL) {
> + destroy_workqueue(board_dat->data[i]->wk);
> + board_dat->data[i]->wk = NULL;
> + dev_dbg(&board_dat->pdev->dev,
> + "%s destroy_workqueue invoked successfully\n",
> + __func__);
> + }
> }
>
> /* disable interrupts & free IRQ */
> if (board_dat->irq_reg_sts) {
> - /* disable interrupts */
> - pch_spi_setclr_reg(board_dat->data->master, PCH_SPCR, 0,
> - PCH_ALL);
> + for (i = 0; i < board_dat->num; i++) {
> + /* disable interrupts */
> + pch_spi_setclr_reg(board_dat->data[i]->master, PCH_SPCR, 0,
> + PCH_ALL);
>
> - /* free IRQ */
> - free_irq(board_dat->pdev->irq, board_dat);
> + if (i == (board_dat->num - 1)) {
> + /* free IRQ */
> + free_irq(board_dat->pdev->irq, board_dat);
>
> - dev_dbg(&board_dat->pdev->dev,
> - "%s free_irq invoked successfully\n", __func__);
> + dev_dbg(&board_dat->pdev->dev,
> + "%s free_irq invoked successfully\n", __func__);
>
> - board_dat->irq_reg_sts = false;
> + board_dat->irq_reg_sts = false;
> + }
> + }
> }
>
> /* unmap PCI base address */
> - if (board_dat->data->io_remap_addr != 0) {
> - pci_iounmap(board_dat->pdev, board_dat->data->io_remap_addr);
> + if (board_dat->data[0]->io_remap_addr != 0) {
> + pci_iounmap(board_dat->pdev, board_dat->data[0]->io_remap_addr);
>
> - board_dat->data->io_remap_addr = 0;
> + for (i = 0; i < board_dat->num; i++)
> + board_dat->data[i]->io_remap_addr = 0;
>
> dev_dbg(&board_dat->pdev->dev,
> "%s pci_iounmap invoked successfully\n", __func__);
> @@ -920,19 +945,23 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat)
> {
> void __iomem *io_remap_addr;
> int retval;
> + int i;
> +
> dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
>
> - /* create workqueue */
> - board_dat->data->wk = create_singlethread_workqueue(KBUILD_MODNAME);
> - if (!board_dat->data->wk) {
> - dev_err(&board_dat->pdev->dev,
> - "%s create_singlet hread_workqueue failed\n", __func__);
> - retval = -EBUSY;
> - goto err_return;
> - }
> + for (i = 0; i < board_dat->num; i++) {
> + /* create workqueue */
> + board_dat->data[i]->wk = create_singlethread_workqueue(KBUILD_MODNAME);
> + if (!board_dat->data[i]->wk) {
> + dev_err(&board_dat->pdev->dev,
> + "%s create_singlet hread_workqueue failed\n", __func__);
> + retval = -EBUSY;
> + goto err_return;
> + }
>
> - dev_dbg(&board_dat->pdev->dev,
> - "%s create_singlethread_workqueue success\n", __func__);
> + dev_dbg(&board_dat->pdev->dev,
> + "%s create_singlethread_workqueue success\n", __func__);
> + }
>
> retval = pci_request_regions(board_dat->pdev, KBUILD_MODNAME);
> if (retval != 0) {
> @@ -951,13 +980,15 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat)
> goto err_return;
> }
>
> - /* calculate base address for all channels */
> - board_dat->data->io_remap_addr = io_remap_addr;
> + for (i = 0; i < board_dat->num; i++) {
> + /* calculate base address for all channels */
> + board_dat->data[i]->io_remap_addr = io_remap_addr + (PCH_SPI_ADDRESS_SIZE * i);
>
> - /* reset PCH SPI h/w */
> - pch_spi_reset(board_dat->data->master);
> - dev_dbg(&board_dat->pdev->dev,
> - "%s pch_spi_reset invoked successfully\n", __func__);
> + /* reset PCH SPI h/w */
> + pch_spi_reset(board_dat->data[i]->master);
> + dev_dbg(&board_dat->pdev->dev,
> + "%s pch_spi_reset invoked successfully\n", __func__);
> + }
>
> /* register IRQ */
> retval = request_irq(board_dat->pdev->irq, pch_spi_handler,
> @@ -989,10 +1020,11 @@ err_return:
> static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> {
>
> - struct spi_master *master;
> + struct spi_master *master[PCH_SPI_MAX_DEV];
>
> struct pch_spi_board_data *board_dat;
> int retval;
> + int i, j;
>
> dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
>
> @@ -1021,37 +1053,40 @@ static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> __func__, retval);
>
> board_dat->pdev = pdev;
> + board_dat->num = id->driver_data;
> +
> + for (i = 0; i < board_dat->num; i++) {
> + /* alllocate memory for SPI master */
> + master[i] = spi_alloc_master(&pdev->dev, sizeof(struct pch_spi_data));
> + if (master[i] == NULL) {
> + retval = -ENOMEM;
> + dev_err(&pdev->dev, "%s Fail.\n", __func__);
> + goto err_spi_alloc_master;
> + }
>
> - /* alllocate memory for SPI master */
> - master = spi_alloc_master(&pdev->dev, sizeof(struct pch_spi_data));
> - if (master == NULL) {
> - retval = -ENOMEM;
> - dev_err(&pdev->dev, "%s Fail.\n", __func__);
> - goto err_spi_alloc_master;
> - }
> -
> - dev_dbg(&pdev->dev,
> - "%s spi_alloc_master returned non NULL\n", __func__);
> + dev_dbg(&pdev->dev,
> + "%s spi_alloc_master returned non NULL\n", __func__);
>
> - /* initialize members of SPI master */
> - master->bus_num = -1;
> - master->num_chipselect = PCH_MAX_CS;
> - master->setup = pch_spi_setup;
> - master->transfer = pch_spi_transfer;
> - dev_dbg(&pdev->dev,
> - "%s transfer member of SPI master initialized\n", __func__);
> + /* initialize members of SPI master */
> + master[i]->bus_num = -1;
> + master[i]->num_chipselect = PCH_MAX_CS;
> + master[i]->setup = pch_spi_setup;
> + master[i]->transfer = pch_spi_transfer;
> + dev_dbg(&pdev->dev,
> + "%s transfer member of SPI master initialized\n", __func__);
>
> - board_dat->data = spi_master_get_devdata(master);
> + board_dat->data[i] = spi_master_get_devdata(master[i]);
>
> - 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;
> + board_dat->data[i]->master = master[i];
> + board_dat->data[i]->n_curnt_chip = 255;
> + board_dat->data[i]->board_dat = board_dat;
> + board_dat->data[i]->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);
> + INIT_LIST_HEAD(&board_dat->data[i]->queue);
> + spin_lock_init(&board_dat->data[i]->lock);
> + INIT_WORK(&board_dat->data[i]->work, pch_spi_process_messages);
> + init_waitqueue_head(&board_dat->data[i]->wait);
> + }
>
> /* allocate resources for PCH SPI */
> retval = pch_spi_get_resources(board_dat);
> @@ -1068,29 +1103,32 @@ static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> dev_dbg(&pdev->dev, "%s invoked pci_set_drvdata\n", __func__);
>
> /* set master mode */
> - pch_spi_set_master_mode(master);
> - dev_dbg(&pdev->dev,
> - "%s invoked pch_spi_set_master_mode\n", __func__);
> + for (i = 0; i < board_dat->num; i++) {
> + pch_spi_set_master_mode(master[i]);
> + dev_dbg(&pdev->dev,
> + "%s invoked pch_spi_set_master_mode\n", __func__);
> +
> + /* Register the controller with the SPI core. */
> + retval = spi_register_master(master[i]);
> + if (retval != 0) {
> + dev_err(&pdev->dev,
> + "%s spi_register_master FAILED\n", __func__);
> + goto err_spi_reg_master;
> + }
>
> - /* Register the controller with the SPI core. */
> - retval = spi_register_master(master);
> - if (retval != 0) {
> - dev_err(&pdev->dev,
> - "%s spi_register_master FAILED\n", __func__);
> - goto err_spi_reg_master;
> + dev_dbg(&pdev->dev, "%s spi_register_master returned=%d\n",
> + __func__, retval);
> }
>
> - dev_dbg(&pdev->dev, "%s spi_register_master returned=%d\n",
> - __func__, retval);
> -
> -
> return 0;
>
> err_spi_reg_master:
> - spi_unregister_master(master);
> + for (j = 0; j < i; j++)
> + spi_unregister_master(master[j]);
> err_spi_get_resources:
> err_spi_alloc_master:
> - spi_master_put(master);
> + for (j = 0; j < i; j++)
> + spi_master_put(master[j]);
> pci_disable_device(pdev);
> err_pci_en_device:
> kfree(board_dat);
> @@ -1102,6 +1140,7 @@ static void pch_spi_remove(struct pci_dev *pdev)
> {
> struct pch_spi_board_data *board_dat = pci_get_drvdata(pdev);
> int count;
> + int i;
>
> dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
>
> @@ -1113,22 +1152,26 @@ static void pch_spi_remove(struct pci_dev *pdev)
>
> /* 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);
> + for (i = 0; i < board_dat->num; i++) {
> + count = 500;
> + spin_lock(&board_dat->data[i]->lock);
> + board_dat->data[i]->status = STATUS_EXITING;
> + while ((list_empty(&board_dat->data[i]->queue) == 0) && --count) {
> + dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n",
> + __func__);
> + spin_unlock(&board_dat->data[i]->lock);
> + msleep(PCH_SLEEP_TIME);
> + spin_lock(&board_dat->data[i]->lock);
> + }
> + spin_unlock(&board_dat->data[i]->lock);
> }
> - spin_unlock(&board_dat->data->lock);
>
> /* Free resources allocated for PCH SPI */
> pch_spi_free_resources(board_dat);
>
> - spi_unregister_master(board_dat->data->master);
> + /* Unregister SPI master */
> + for (i = 0; i < board_dat->num; i++)
> + spi_unregister_master(board_dat->data[i]->master);
>
> /* free memory for private data */
> kfree(board_dat);
> @@ -1146,6 +1189,7 @@ static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
> {
> u8 count;
> int retval;
> + int i;
>
> struct pch_spi_board_data *board_dat = pci_get_drvdata(pdev);
>
> @@ -1162,25 +1206,29 @@ static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
>
> /* check if the current message is processed:
> Only after thats done the transfer will be suspended */
> - count = 255;
> - while ((--count) > 0) {
> - if (!(board_dat->data->bcurrent_msg_processing)) {
> - dev_dbg(&pdev->dev, "%s board_dat->data->bCurrent_"
> - "msg_processing = false\n", __func__);
> - break;
> - } else {
> - dev_dbg(&pdev->dev, "%s board_dat->data->bCurrent_msg_"
> - "processing = true\n", __func__);
> + for (i = 0; i < board_dat->num; i++) {
> + count = 255;
> + while ((--count) > 0) {
> + if (!(board_dat->data[i]->bcurrent_msg_processing)) {
> + dev_dbg(&pdev->dev, "%s board_dat->data->bCurrent_"
> + "msg_processing = false\n", __func__);
> + break;
> + } else {
> + dev_dbg(&pdev->dev, "%s board_dat->data->bCurrent_msg_"
> + "processing = true\n", __func__);
> + }
> + msleep(PCH_SLEEP_TIME);
> }
> - msleep(PCH_SLEEP_TIME);
> }
>
> /* Free IRQ */
> if (board_dat->irq_reg_sts) {
> - /* disable all interrupts */
> - pch_spi_setclr_reg(board_dat->data->master, PCH_SPCR, 0,
> - PCH_ALL);
> - pch_spi_reset(board_dat->data->master);
> + /* disable all interrupts */
> + for (i = 0; i < board_dat->num; i++) {
> + pch_spi_setclr_reg(board_dat->data[i]->master, PCH_SPCR, 0,
> + PCH_ALL);
> + pch_spi_reset(board_dat->data[i]->master);
> + }
>
> free_irq(board_dat->pdev->irq, board_dat);
>
> @@ -1221,6 +1269,7 @@ static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
> static int pch_spi_resume(struct pci_dev *pdev)
> {
> int retval;
> + int i;
>
> struct pch_spi_board_data *board = pci_get_drvdata(pdev);
> dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
> @@ -1259,8 +1308,10 @@ static int pch_spi_resume(struct pci_dev *pdev)
> board->irq_reg_sts = true;
>
> /* reset PCH SPI h/w */
> - pch_spi_reset(board->data->master);
> - pch_spi_set_master_mode(board->data->master);
> + for (i = 0; i < board->num; i++) {
> + pch_spi_reset(board->data[i]->master);
> + pch_spi_set_master_mode(board->data[i]->master);
> + }
>
> /* set suspend status to false */
> board->suspend_sts = false;
> --
> 1.6.0.6
>
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