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?
> + 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.
> +}
> +
> /**
> * 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?
> + 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?
> +};
> +
> /**
> * 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.
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 *);
>
> /**
> --
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> of Code Aurora Forum, hosted by The Linux Foundation.
>
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