On 9/9/2013 5:03 PM, Seungwon Jeon wrote:
> Hi Sujit,
>
> On Tue, August 27, 2013, Sujit Reddy Thumma wrote:
>> Some vendor specific controller versions might need to configure
>> vendor specific - registers, clocks, voltage regulators etc. to
>> initialize the host controller UTP layer and Uni-Pro stack.
>> Provide some common initialization operations that can be used
>> to configure vendor specifics. The methods can be extended in
>> future, for example, for power mode transitions.
>>
>> The operations are vendor/board specific and hence determined with
>> the help of compatible property in device tree.
>>
>> Signed-off-by: Sujit Reddy Thumma <sthumma@xxxxxxxxxxxxxx>
>> ---
>> drivers/scsi/ufs/ufshcd-pci.c | 8 +-
>> drivers/scsi/ufs/ufshcd-pltfrm.c | 24 +++++-
>> drivers/scsi/ufs/ufshcd.c | 157 +++++++++++++++++++++++++++++++--------
>> drivers/scsi/ufs/ufshcd.h | 34 ++++++++-
>> 4 files changed, 187 insertions(+), 36 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
>> index a823cf4..6b0d299 100644
>> --- a/drivers/scsi/ufs/ufshcd-pci.c
>> +++ b/drivers/scsi/ufs/ufshcd-pci.c
>> @@ -191,7 +191,13 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>> return err;
>> }
>>
>> - err = ufshcd_init(&pdev->dev, &hba, mmio_base, pdev->irq);
>> + err = ufshcd_alloc_host(&pdev->dev, &hba);
>> + if (err) {
>> + dev_err(&pdev->dev, "Allocation failed\n");
>> + return err;
>> + }
>> +
>> + err = ufshcd_init(hba, mmio_base, pdev->irq);
>> if (err) {
>> dev_err(&pdev->dev, "Initialization failed\n");
>> return err;
>> diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
>> index 5e46232..9c94052 100644
>> --- a/drivers/scsi/ufs/ufshcd-pltfrm.c
>> +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
>> @@ -35,9 +35,23 @@
>>
>> #include <linux/platform_device.h>
>> #include <linux/pm_runtime.h>
>> +#include <linux/of.h>
>>
>> #include "ufshcd.h"
>>
>> +static const struct of_device_id ufs_of_match[];
>> +static struct ufs_hba_variant_ops *get_variant_ops(struct device *dev)
>> +{
>> + if (dev->of_node) {
>> + const struct of_device_id *match;
>> + match = of_match_node(ufs_of_match, dev->of_node);
>> + if (match)
>> + return (struct ufs_hba_variant_ops *)match->data;
>> + }
>> +
>> + return NULL;
>> +}
>> +
>> #ifdef CONFIG_PM
>> /**
>> * ufshcd_pltfrm_suspend - suspend power management function
>> @@ -150,10 +164,18 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
>> goto out;
>> }
>>
>> + err = ufshcd_alloc_host(dev, &hba);
>> + if (err) {
>> + dev_err(&pdev->dev, "Allocation failed\n");
>> + goto out;
>> + }
>> +
>> + hba->vops = get_variant_ops(&pdev->dev);
>> +
>> pm_runtime_set_active(&pdev->dev);
>> pm_runtime_enable(&pdev->dev);
>>
>> - err = ufshcd_init(dev, &hba, mmio_base, irq);
>> + err = ufshcd_init(hba, mmio_base, irq);
>> if (err) {
>> dev_err(dev, "Intialization failed\n");
>> goto out_disable_rpm;
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index a0f5ac2..743696a 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -174,13 +174,14 @@ static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
>> /**
>> * ufshcd_is_device_present - Check if any device connected to
>> * the host controller
>> - * @reg_hcs - host controller status register value
>> + * @hba: pointer to adapter instance
>> *
>> * Returns 1 if device present, 0 if no device detected
>> */
>> -static inline int ufshcd_is_device_present(u32 reg_hcs)
>> +static inline int ufshcd_is_device_present(struct ufs_hba *hba)
>> {
>> - return (DEVICE_PRESENT & reg_hcs) ? 1 : 0;
>> + return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
>> + DEVICE_PRESENT) ? 1 : 0;
>> }
>>
>> /**
>> @@ -1483,11 +1484,10 @@ out:
>> * @hba: per adapter instance
>> *
>> * To bring UFS host controller to operational state,
>> - * 1. Check if device is present
>> - * 2. Enable required interrupts
>> - * 3. Configure interrupt aggregation
>> - * 4. Program UTRL and UTMRL base addres
>> - * 5. Configure run-stop-registers
>> + * 1. Enable required interrupts
>> + * 2. Configure interrupt aggregation
>> + * 3. Program UTRL and UTMRL base addres
>> + * 4. Configure run-stop-registers
>> *
>> * Returns 0 on success, non-zero value on failure
>> */
>> @@ -1496,14 +1496,6 @@ static int ufshcd_make_hba_operational(struct ufs_hba *hba)
>> int err = 0;
>> u32 reg;
>>
>> - /* check if device present */
>> - reg = ufshcd_readl(hba, REG_CONTROLLER_STATUS);
>> - if (!ufshcd_is_device_present(reg)) {
>> - dev_err(hba->dev, "cc: Device not present\n");
>> - err = -ENXIO;
>> - goto out;
>> - }
>> -
>> /* Enable required interrupts */
>> ufshcd_enable_intr(hba, UFSHCD_ENABLE_INTRS);
>>
>> @@ -1524,6 +1516,7 @@ static int ufshcd_make_hba_operational(struct ufs_hba *hba)
>> * UCRDY, UTMRLDY and UTRLRDY bits must be 1
>> * DEI, HEI bits must be 0
>> */
>> + reg = ufshcd_readl(hba, REG_CONTROLLER_STATUS);
>> if (!(ufshcd_get_lists_status(reg))) {
>> ufshcd_enable_run_stop_reg(hba);
>> } else {
>> @@ -1570,6 +1563,9 @@ static int ufshcd_hba_enable(struct ufs_hba *hba)
>> msleep(5);
>> }
>>
>> + if (hba->vops && hba->vops->hce_enable_notify)
>> + hba->vops->hce_enable_notify(hba, PRE_CHANGE);
>> +
>> /* start controller initialization sequence */
>> ufshcd_hba_start(hba);
>>
>> @@ -1597,6 +1593,10 @@ static int ufshcd_hba_enable(struct ufs_hba *hba)
>> }
>> msleep(5);
>> }
>> +
>> + if (hba->vops && hba->vops->hce_enable_notify)
>> + hba->vops->hce_enable_notify(hba, POST_CHANGE);
>> +
>> return 0;
>> }
>>
>> @@ -1613,12 +1613,28 @@ static int ufshcd_link_startup(struct ufs_hba *hba)
>> /* enable UIC related interrupts */
>> ufshcd_enable_intr(hba, UIC_COMMAND_COMPL);
>>
>> + if (hba->vops && hba->vops->link_startup_notify)
>> + hba->vops->link_startup_notify(hba, PRE_CHANGE);
>> +
>> ret = ufshcd_dme_link_startup(hba);
>> if (ret)
>> goto out;
>>
>> - ret = ufshcd_make_hba_operational(hba);
>> + /* check if device is detected by inter-connect layer */
>> + if (!ufshcd_is_device_present(hba)) {
>> + dev_err(hba->dev, "%s: Device not present\n", __func__);
>> + ret = -ENXIO;
>> + goto out;
>> + }
>>
>> + /* Include any host controller configuration via UIC commands */
>> + if (hba->vops && hba->vops->link_startup_notify) {
>> + ret = hba->vops->link_startup_notify(hba, POST_CHANGE);
>> + if (ret)
>> + goto out;
>> + }
>> +
>> + ret = ufshcd_make_hba_operational(hba);
>> out:
>> if (ret)
>> dev_err(hba->dev, "link startup failed %d\n", ret);
>> @@ -2810,6 +2826,61 @@ static struct scsi_host_template ufshcd_driver_template = {
>> .can_queue = UFSHCD_CAN_QUEUE,
>> };
>>
>> +static int ufshcd_variant_hba_init(struct ufs_hba *hba)
>> +{
>> + int err = 0;
>> +
>> + if (!hba->vops)
>> + goto out;
>> +
>> + if (hba->vops->init) {
>> + err = hba->vops->init(hba);
> If init() is allowed to access host specific registers,
> setup_clocks() and setup_regulators() may precede init() generally.
> As seeing your description, it seems certain.
> <Quot>
> @init: called when the driver is initialized
> @setup_clocks: called before touching any of the controller registers
> @setup_regulators: called before accessing the host controller
> </Quot>
>
> Further, possibly init() implementation might substitute all?
Yes, we can. The reason I would like to keep it different because it
can be used during power management. For example, -
init -> clk_get();
setup_clocks -> clk_prepare_enable();
ufshcd_runtime_suspend()
{
...
hba->vops->setup_clocks(false);
}
ufshcd_runtime_resume()
{
hba->vops->setup_clocks(true);
...
}
>
>> + if (err)
>> + goto out;
>> + }
>> +
>> + if (hba->vops->setup_clocks) {
>> + err = hba->vops->setup_clocks(hba, true);
>> + if (err)
>> + goto out_exit;
>> + }
>> +
>> + if (hba->vops->setup_regulators) {
>> + err = hba->vops->setup_regulators(hba, true);
>> + if (err)
>> + goto out_clks;
>> + }
>> +
>> + goto out;
>> +
>> +out_clks:
>> + if (hba->vops->setup_clocks)
>> + hba->vops->setup_clocks(hba, false);
>> +out_exit:
>> + if (hba->vops->exit)
>> + hba->vops->exit(hba);
>> +out:
>> + if (err)
>> + dev_err(hba->dev, "%s: variant %s init failed err %d\n",
>> + __func__, hba->vops ? hba->vops->name : "", err);
>> + return err;
>> +}
>> +
>> +static void ufshcd_variant_hba_exit(struct ufs_hba *hba)
>> +{
>> + if (!hba->vops)
>> + return;
>> +
>> + if (hba->vops->setup_clocks)
>> + hba->vops->setup_clocks(hba, false);
>> +
>> + if (hba->vops->setup_regulators)
>> + hba->vops->setup_regulators(hba, false);
>> +
>> + if (hba->vops->exit)
>> + hba->vops->exit(hba);
> It's similar with init() case above.
Just to keep consistent with init() procedures.
>
>> +}
>> +
>> /**
>> * ufshcd_suspend - suspend power management function
>> * @hba: per adapter instance
>> @@ -2894,23 +2965,22 @@ void ufshcd_remove(struct ufs_hba *hba)
>> ufshcd_hba_stop(hba);
>>
>> scsi_host_put(hba->host);
>> +
>> + ufshcd_variant_hba_exit(hba);
>> }
>> EXPORT_SYMBOL_GPL(ufshcd_remove);
>>
>> /**
>> - * ufshcd_init - Driver initialization routine
>> + * ufshcd_alloc_host - allocate Host Bus Adapter (HBA)
>> * @dev: pointer to device handle
>> * @hba_handle: driver private handle
>> - * @mmio_base: base register address
>> - * @irq: Interrupt line of device
>> * Returns 0 on success, non-zero value on failure
>> */
>> -int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
>> - void __iomem *mmio_base, unsigned int irq)
>> +int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
>> {
>> struct Scsi_Host *host;
>> struct ufs_hba *hba;
>> - int err;
>> + int err = 0;
>>
>> if (!dev) {
>> dev_err(dev,
>> @@ -2919,13 +2989,6 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
>> goto out_error;
>> }
>>
>> - if (!mmio_base) {
>> - dev_err(dev,
>> - "Invalid memory reference for mmio_base is NULL\n");
>> - err = -ENODEV;
>> - goto out_error;
>> - }
>> -
>> host = scsi_host_alloc(&ufshcd_driver_template,
>> sizeof(struct ufs_hba));
>> if (!host) {
>> @@ -2936,9 +2999,40 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
>> hba = shost_priv(host);
>> hba->host = host;
>> hba->dev = dev;
>> + *hba_handle = hba;
>> +
>> +out_error:
>> + return err;
>> +}
>> +EXPORT_SYMBOL(ufshcd_alloc_host);
>> +
>> +/**
>> + * ufshcd_init - Driver initialization routine
>> + * @hba: per-adapter instance
>> + * @mmio_base: base register address
>> + * @irq: Interrupt line of device
>> + * Returns 0 on success, non-zero value on failure
>> + */
>> +int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
>> +{
>> + int err;
>> + struct Scsi_Host *host = hba->host;
>> + struct device *dev = hba->dev;
>> +
>> + if (!mmio_base) {
>> + dev_err(hba->dev,
>> + "Invalid memory reference for mmio_base is NULL\n");
>> + err = -ENODEV;
>> + goto out_error;
>> + }
>> +
>> hba->mmio_base = mmio_base;
>> hba->irq = irq;
>>
>> + err = ufshcd_variant_hba_init(hba);
>> + if (err)
>> + goto out_error;
>> +
>> /* Read capabilities registers */
>> ufshcd_hba_capabilities(hba);
>>
>> @@ -3010,8 +3104,6 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
>> goto out_remove_scsi_host;
>> }
>>
>> - *hba_handle = hba;
>> -
>> /* Hold auto suspend until async scan completes */
>> pm_runtime_get_sync(dev);
>>
>> @@ -3023,6 +3115,7 @@ out_remove_scsi_host:
>> scsi_remove_host(hba->host);
>> out_disable:
>> scsi_host_put(host);
>> + ufshcd_variant_hba_exit(hba);
>> out_error:
>> return err;
>> }
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index 8f5624e..72acbc7 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -68,6 +68,8 @@
>> #define UFSHCD "ufshcd"
>> #define UFSHCD_DRIVER_VERSION "0.2"
>>
>> +struct ufs_hba;
>> +
>> enum dev_cmd_type {
>> DEV_CMD_TYPE_NOP = 0x0,
>> DEV_CMD_TYPE_QUERY = 0x1,
>> @@ -152,6 +154,30 @@ struct ufs_dev_cmd {
>> struct ufs_query query;
>> };
>>
>> +#define PRE_CHANGE 0
>> +#define POST_CHANGE 1
>> +/**
>> + * struct ufs_hba_variant_ops - variant specific callbacks
>> + * @name: variant name
>> + * @init: called when the driver is initialized
>> + * @exit: called to cleanup everything done in init
>> + * @setup_clocks: called before touching any of the controller registers
>> + * @setup_regulators: called before accessing the host controller
>> + * @hce_enable_notify: called before and after HCE enable bit is set to allow
>> + * variant specific Uni-Pro initialization.
>> + * @link_startup_notify: called before and after Link startup is carried out
>> + * to allow variant specific Uni-Pro initialization.
>> + */
>> +struct ufs_hba_variant_ops {
>> + const char *name;
>> + int (*init)(struct ufs_hba *);
>> + void (*exit)(struct ufs_hba *);
>> + int (*setup_clocks)(struct ufs_hba *, bool);
>> + int (*setup_regulators)(struct ufs_hba *, bool);
>> + int (*hce_enable_notify)(struct ufs_hba *, bool);
> I agree on specific link_startup as HCI specification mentions.
> Actually we also have implemented similar thing in our host driver.
> But I'm not sure of a necessity of hce_enable_notify. Could you explain for that?
I am not sure about other M-PHY implementations but in our h/w there
are certain M-PHY specific configurations that needs to be done before
enabling the host controller and also some state machine check after
resetting the controller.
>
>> + int (*link_startup_notify)(struct ufs_hba *, bool);
> If a host specific implementation doesn't have two fully,
> one of them will be called with flag unnecessarily.
> How about separating into two functions[pre_, post_] for link_startup?
Agree.
>
>> +};
>> +
>> /**
>> * struct ufs_hba - per adapter private structure
>> * @mmio_base: UFSHCI base register address
>> @@ -171,6 +197,8 @@ struct ufs_dev_cmd {
>> * @nutrs: Transfer Request Queue depth supported by controller
>> * @nutmrs: Task Management Queue depth supported by controller
>> * @ufs_version: UFS Version to which controller complies
>> + * @vops: pointer to variant specific operations
>> + * @priv: pointer to variant specific private data
>> * @irq: Irq number of the controller
>> * @active_uic_cmd: handle of active UIC command
>> * @uic_cmd_mutex: mutex for uic command
>> @@ -217,6 +245,8 @@ struct ufs_hba {
>> int nutrs;
>> int nutmrs;
>> u32 ufs_version;
>> + struct ufs_hba_variant_ops *vops;
> 'const' declaration is expected.
Agree.
>
> Thanks,
> Seungwon Jeon
>
>> + void *priv;
>> unsigned int irq;
>>
>> struct uic_command *active_uic_cmd;
>> @@ -253,8 +283,8 @@ struct ufs_hba {
>> #define ufshcd_readl(hba, reg) \
>> readl((hba)->mmio_base + (reg))
>>
>> -int ufshcd_init(struct device *, struct ufs_hba ** , void __iomem * ,
>> - unsigned int);
>> +int ufshcd_alloc_host(struct device *, struct ufs_hba **);
>> +int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int);
>> void ufshcd_remove(struct ufs_hba *);
>>
>> /**
>> --
>> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
>> of Code Aurora Forum, hosted by The Linux Foundation.
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
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>
--
Regards,
Sujit
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