Messages in this thread | | | Date | Sun, 14 Jul 2019 11:40:19 -0700 | From | Moritz Fischer <> | Subject | Re: [PATCH 1/3] fpga: altera-cvp: Discover Vendor Specific offset |
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On Thu, Jul 11, 2019 at 03:32:48PM -0500, thor.thayer@linux.intel.com wrote: > From: Thor Thayer <thor.thayer@linux.intel.com> > > Newer Intel FPGAs have different Vendor Specific offsets than > legacy parts. Use PCI discovery to find the CvP registers. > Since the register positions remain the same, change the hard > coded address to a more flexible way of indexing registers > from the offset. > Adding new PCI read and write abstraction functions to > handle the offset (altera_read_config_dword() and > altera_write_config_dword()). > > Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com> > --- > drivers/fpga/altera-cvp.c | 91 +++++++++++++++++++++++++++++------------------ > 1 file changed, 56 insertions(+), 35 deletions(-) > > diff --git a/drivers/fpga/altera-cvp.c b/drivers/fpga/altera-cvp.c > index 770915fb97f9..04f2b2a072a7 100644 > --- a/drivers/fpga/altera-cvp.c > +++ b/drivers/fpga/altera-cvp.c > @@ -22,10 +22,10 @@ > #define TIMEOUT_US 2000 /* CVP STATUS timeout for USERMODE polling */ > > /* Vendor Specific Extended Capability Registers */ > -#define VSE_PCIE_EXT_CAP_ID 0x200 > +#define VSE_PCIE_EXT_CAP_ID 0x0 > #define VSE_PCIE_EXT_CAP_ID_VAL 0x000b /* 16bit */ > > -#define VSE_CVP_STATUS 0x21c /* 32bit */ > +#define VSE_CVP_STATUS 0x1c /* 32bit */ > #define VSE_CVP_STATUS_CFG_RDY BIT(18) /* CVP_CONFIG_READY */ > #define VSE_CVP_STATUS_CFG_ERR BIT(19) /* CVP_CONFIG_ERROR */ > #define VSE_CVP_STATUS_CVP_EN BIT(20) /* ctrl block is enabling CVP */ > @@ -33,18 +33,18 @@ > #define VSE_CVP_STATUS_CFG_DONE BIT(23) /* CVP_CONFIG_DONE */ > #define VSE_CVP_STATUS_PLD_CLK_IN_USE BIT(24) /* PLD_CLK_IN_USE */ > > -#define VSE_CVP_MODE_CTRL 0x220 /* 32bit */ > +#define VSE_CVP_MODE_CTRL 0x20 /* 32bit */ > #define VSE_CVP_MODE_CTRL_CVP_MODE BIT(0) /* CVP (1) or normal mode (0) */ > #define VSE_CVP_MODE_CTRL_HIP_CLK_SEL BIT(1) /* PMA (1) or fabric clock (0) */ > #define VSE_CVP_MODE_CTRL_NUMCLKS_OFF 8 /* NUMCLKS bits offset */ > #define VSE_CVP_MODE_CTRL_NUMCLKS_MASK GENMASK(15, 8) > > -#define VSE_CVP_DATA 0x228 /* 32bit */ > -#define VSE_CVP_PROG_CTRL 0x22c /* 32bit */ > +#define VSE_CVP_DATA 0x28 /* 32bit */ > +#define VSE_CVP_PROG_CTRL 0x2c /* 32bit */ > #define VSE_CVP_PROG_CTRL_CONFIG BIT(0) > #define VSE_CVP_PROG_CTRL_START_XFER BIT(1) > > -#define VSE_UNCOR_ERR_STATUS 0x234 /* 32bit */ > +#define VSE_UNCOR_ERR_STATUS 0x34 /* 32bit */ > #define VSE_UNCOR_ERR_CVP_CFG_ERR BIT(5) /* CVP_CONFIG_ERROR_LATCHED */ > > #define DRV_NAME "altera-cvp" > @@ -60,14 +60,27 @@ struct altera_cvp_conf { > void (*write_data)(struct altera_cvp_conf *, u32); > char mgr_name[64]; > u8 numclks; > + u32 vsec_offset; > }; > > +static inline void altera_read_config_dword(struct altera_cvp_conf *conf, > + int where, u32 *val) > +{ > + pci_read_config_dword(conf->pci_dev, conf->vsec_offset + where, val); > +}
I think the compiler would inline those anyway. > + > +static inline void altera_write_config_dword(struct altera_cvp_conf *conf, > + int where, u32 val) > +{ > + pci_write_config_dword(conf->pci_dev, conf->vsec_offset + where, val); > +}
I think the compiler would inline those anyway. > + > static enum fpga_mgr_states altera_cvp_state(struct fpga_manager *mgr) > { > struct altera_cvp_conf *conf = mgr->priv; > u32 status; > > - pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &status); > + altera_read_config_dword(conf, VSE_CVP_STATUS, &status); > > if (status & VSE_CVP_STATUS_CFG_DONE) > return FPGA_MGR_STATE_OPERATING; > @@ -85,7 +98,8 @@ static void altera_cvp_write_data_iomem(struct altera_cvp_conf *conf, u32 val) > > static void altera_cvp_write_data_config(struct altera_cvp_conf *conf, u32 val) > { > - pci_write_config_dword(conf->pci_dev, VSE_CVP_DATA, val); > + pci_write_config_dword(conf->pci_dev, conf->vsec_offset + VSE_CVP_DATA, > + val); > } > > /* switches between CvP clock and internal clock */ > @@ -95,10 +109,10 @@ static void altera_cvp_dummy_write(struct altera_cvp_conf *conf) > u32 val; > > /* set 1 CVP clock cycle for every CVP Data Register Write */ > - pci_read_config_dword(conf->pci_dev, VSE_CVP_MODE_CTRL, &val); > + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); > val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK; > val |= 1 << VSE_CVP_MODE_CTRL_NUMCLKS_OFF; > - pci_write_config_dword(conf->pci_dev, VSE_CVP_MODE_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); > > for (i = 0; i < CVP_DUMMY_WR; i++) > conf->write_data(conf, 0); /* dummy data, could be any value */ > @@ -115,7 +129,7 @@ static int altera_cvp_wait_status(struct altera_cvp_conf *conf, u32 status_mask, > retries++; > > do { > - pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &val); > + altera_read_config_dword(conf, VSE_CVP_STATUS, &val); > if ((val & status_mask) == status_val) > return 0; > > @@ -130,18 +144,17 @@ static int altera_cvp_teardown(struct fpga_manager *mgr, > struct fpga_image_info *info) > { > struct altera_cvp_conf *conf = mgr->priv; > - struct pci_dev *pdev = conf->pci_dev; > int ret; > u32 val; > > /* STEP 12 - reset START_XFER bit */ > - pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val); > + altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); > val &= ~VSE_CVP_PROG_CTRL_START_XFER; > - pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); > > /* STEP 13 - reset CVP_CONFIG bit */ > val &= ~VSE_CVP_PROG_CTRL_CONFIG; > - pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); > > /* > * STEP 14 > @@ -163,7 +176,6 @@ static int altera_cvp_write_init(struct fpga_manager *mgr, > const char *buf, size_t count) > { > struct altera_cvp_conf *conf = mgr->priv; > - struct pci_dev *pdev = conf->pci_dev; > u32 iflags, val; > int ret; > > @@ -183,7 +195,7 @@ static int altera_cvp_write_init(struct fpga_manager *mgr, > conf->numclks = 1; /* for uncompressed and unencrypted images */ > > /* STEP 1 - read CVP status and check CVP_EN flag */ > - pci_read_config_dword(pdev, VSE_CVP_STATUS, &val); > + altera_read_config_dword(conf, VSE_CVP_STATUS, &val); > if (!(val & VSE_CVP_STATUS_CVP_EN)) { > dev_err(&mgr->dev, "CVP mode off: 0x%04x\n", val); > return -ENODEV; > @@ -201,14 +213,14 @@ static int altera_cvp_write_init(struct fpga_manager *mgr, > * - set HIP_CLK_SEL and CVP_MODE (must be set in the order mentioned) > */ > /* switch from fabric to PMA clock */ > - pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val); > + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); > val |= VSE_CVP_MODE_CTRL_HIP_CLK_SEL; > - pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); > > /* set CVP mode */ > - pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val); > + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); > val |= VSE_CVP_MODE_CTRL_CVP_MODE; > - pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); > > /* > * STEP 3 > @@ -217,10 +229,10 @@ static int altera_cvp_write_init(struct fpga_manager *mgr, > altera_cvp_dummy_write(conf); > > /* STEP 4 - set CVP_CONFIG bit */ > - pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val); > + altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); > /* request control block to begin transfer using CVP */ > val |= VSE_CVP_PROG_CTRL_CONFIG; > - pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); > > /* STEP 5 - poll CVP_CONFIG READY for 1 with 10us timeout */ > ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, > @@ -237,15 +249,15 @@ static int altera_cvp_write_init(struct fpga_manager *mgr, > altera_cvp_dummy_write(conf); > > /* STEP 7 - set START_XFER */ > - pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val); > + altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); > val |= VSE_CVP_PROG_CTRL_START_XFER; > - pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); > > /* STEP 8 - start transfer (set CVP_NUMCLKS for bitstream) */ > - pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val); > + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); > val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK; > val |= conf->numclks << VSE_CVP_MODE_CTRL_NUMCLKS_OFF; > - pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); > > return 0; > } > @@ -256,7 +268,7 @@ static inline int altera_cvp_chk_error(struct fpga_manager *mgr, size_t bytes) > u32 val; > > /* STEP 10 (optional) - check CVP_CONFIG_ERROR flag */ > - pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &val); > + altera_read_config_dword(conf, VSE_CVP_STATUS, &val); > if (val & VSE_CVP_STATUS_CFG_ERR) { > dev_err(&mgr->dev, "CVP_CONFIG_ERROR after %zu bytes!\n", > bytes); > @@ -315,7 +327,6 @@ static int altera_cvp_write_complete(struct fpga_manager *mgr, > struct fpga_image_info *info) > { > struct altera_cvp_conf *conf = mgr->priv; > - struct pci_dev *pdev = conf->pci_dev; > int ret; > u32 mask; > u32 val; > @@ -325,17 +336,17 @@ static int altera_cvp_write_complete(struct fpga_manager *mgr, > return ret; > > /* STEP 16 - check CVP_CONFIG_ERROR_LATCHED bit */ > - pci_read_config_dword(pdev, VSE_UNCOR_ERR_STATUS, &val); > + altera_read_config_dword(conf, VSE_UNCOR_ERR_STATUS, &val); > if (val & VSE_UNCOR_ERR_CVP_CFG_ERR) { > dev_err(&mgr->dev, "detected CVP_CONFIG_ERROR_LATCHED!\n"); > return -EPROTO; > } > > /* STEP 17 - reset CVP_MODE and HIP_CLK_SEL bit */ > - pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val); > + altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); > val &= ~VSE_CVP_MODE_CTRL_HIP_CLK_SEL; > val &= ~VSE_CVP_MODE_CTRL_CVP_MODE; > - pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val); > + altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); > > /* STEP 18 - poll PLD_CLK_IN_USE and USER_MODE bits */ > mask = VSE_CVP_STATUS_PLD_CLK_IN_USE | VSE_CVP_STATUS_USERMODE; > @@ -396,20 +407,27 @@ static int altera_cvp_probe(struct pci_dev *pdev, > struct fpga_manager *mgr; > u16 cmd, val; > u32 regval; > - int ret; > + int ret, offset;
Reverse tree, please: struct fpga_manager *mgr; + int ret, offset; u16 cmd, val; u32 regval; - int ret;
> + > + /* Discover the Vendor Specific Offset for this device */ > + offset = pci_find_next_ext_capability(pdev, 0, PCI_EXT_CAP_ID_VNDR); > + if (!offset) { > + dev_err(&pdev->dev, "No Vendor Specific Offset.\n"); > + return -ENODEV; > + } > > /* > * First check if this is the expected FPGA device. PCI config > * space access works without enabling the PCI device, memory > * space access is enabled further down. > */ > - pci_read_config_word(pdev, VSE_PCIE_EXT_CAP_ID, &val); > + pci_read_config_word(pdev, offset + VSE_PCIE_EXT_CAP_ID, &val); > if (val != VSE_PCIE_EXT_CAP_ID_VAL) { > dev_err(&pdev->dev, "Wrong EXT_CAP_ID value 0x%x\n", val); > return -ENODEV; > } > > - pci_read_config_dword(pdev, VSE_CVP_STATUS, ®val); > + pci_read_config_dword(pdev, offset + VSE_CVP_STATUS, ®val); > if (!(regval & VSE_CVP_STATUS_CVP_EN)) { > dev_err(&pdev->dev, > "CVP is disabled for this device: CVP_STATUS Reg 0x%x\n", > @@ -421,6 +439,9 @@ static int altera_cvp_probe(struct pci_dev *pdev, > if (!conf) > return -ENOMEM; > > + conf->vsec_offset = offset;
If you'd swap the order you could use your new helper earlier, right? not sure if that saves you some code. Your call.
> + dev_dbg(&pdev->dev, "Vendor Specific Data Offset at 0x%x\n", offset); > + > /* > * Enable memory BAR access. We cannot use pci_enable_device() here > * because it will make the driver unusable with FPGA devices that > -- > 2.7.4 >
Thanks, Moritz
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