| Message ID | 1720427152-4052539-1-git-send-email-radhey.shyam.pandey@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] usb: dwc3: enable CCI support for AMD-xilinx DWC3 controller | expand |
Hi, On Mon, Jul 08, 2024, Radhey Shyam Pandey wrote: > The GSBUSCFG0 register bits [31:16] are used to configure the cache type > settings of the descriptor and data write/read transfers (Cacheable, > Bufferable/Posted). When CCI is enabled in the design, DWC3 core GSBUSCFG0 > cache bits must be updated to support CCI enabled transfers in USB. > > To program GSBUSCFG0 cache bits create a software node property > in AMD-xilinx dwc3 glue driver and pass it to dwc3 core. The core > then reads this property value and configures it in dwc3_core_init() > sequence. > > Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com> > --- > Changes for v4: > > - Pass swnode GSBUSCFG0 cache property from glue driver based on > dma-coherent flag. > - Introduce function dwc3_get_software_properties(). > - Rename DWC3_GSBUSCFG0_REQINFO_MASK. > - Use DWC3_GSBUSCFG0_REQINFO(n) and get rid of mask shift define. > - Rename dwc3 member gsbuscfg0_reqinfo and change it type to u32 > and define 0xffffffff as unspecified. > - In comment dwc3_get_software_properties() description also mention > "non-DT (non-ABI) properties". > > Changes for v3: > - In v2 review as suggested by Thinh Nguyen, switch to swnode > implementation for passing GSBUSCFG0 cache bits from AMD-xilinx > dwc3 glue driver to core driver. > > Changes for v2: > - Make GSBUSCFG0 configuration specific to AMD-xilinx platform. > Taken reference from existing commit ec5eb43813a4 ("usb: dwc3: core: > add support for realtek SoCs custom's global register start address") > > v1 link: > https://urldefense.com/v3/__https://lore.kernel.org/all/20231013053448.11056-1-piyush.mehta@amd.com__;!!A4F2R9G_pg!am1D9hRrSGeDKIL_gkCMiaw4qKGYni_j2_GzjGvdkTuJCqUcX2OQtJKtrvZKdQ6DLvT6uu7FEIf1OiB8-vjozf7E-SlrKQ$ > --- > drivers/usb/dwc3/core.c | 38 ++++++++++++++++++++++++++++++++++ > drivers/usb/dwc3/core.h | 8 +++++++ > drivers/usb/dwc3/dwc3-xilinx.c | 29 ++++++++++++++++++++++++++ > 3 files changed, 75 insertions(+) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index cb82557678dd..fe216a6ff652 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -23,6 +23,7 @@ > #include <linux/delay.h> > #include <linux/dma-mapping.h> > #include <linux/of.h> > +#include <linux/of_address.h> We no long need to include this in core.c right? > #include <linux/of_graph.h> > #include <linux/acpi.h> > #include <linux/pinctrl/consumer.h> > @@ -599,6 +600,18 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc) > parms->hwparams9 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS9); > } > > +static void dwc3_config_soc_bus(struct dwc3 *dwc) > +{ > + if (dwc->gsbuscfg0_reqinfo != DWC3_GSBUSCFG0_REQINFO_DEF) { > + u32 reg; > + > + reg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0); > + reg &= ~DWC3_GSBUSCFG0_REQINFO(~0); > + reg |= DWC3_GSBUSCFG0_REQINFO(dwc->gsbuscfg0_reqinfo); > + dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, reg); > + } > +} > + > static int dwc3_core_ulpi_init(struct dwc3 *dwc) > { > int intf; > @@ -1338,6 +1351,8 @@ static int dwc3_core_init(struct dwc3 *dwc) > > dwc3_set_incr_burst_type(dwc); > > + dwc3_config_soc_bus(dwc); > + > ret = dwc3_phy_power_on(dwc); > if (ret) > goto err_exit_phy; > @@ -1756,6 +1771,27 @@ static void dwc3_get_properties(struct dwc3 *dwc) > dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num; > } > > +static void dwc3_get_software_properties(struct dwc3 *dwc) Can we move this above dwc3_get_properties(). I'd call this within dwc3_get_properties(), but it's fine even if you leave it separate for now. That'll help reduce the code footprint when we refactor and move the other software properties in here. > +{ > + struct device *tmpdev; > + u16 gsbuscfg0_reqinfo; > + int ret; > + > + dwc->gsbuscfg0_reqinfo = DWC3_GSBUSCFG0_REQINFO_DEF; > + > + /* > + * Iterate over all parent nodes for finding swnode properties > + * and non-DT (non-ABI) properties. > + */ > + for (tmpdev = dwc->dev; tmpdev; tmpdev = tmpdev->parent) { > + ret = device_property_read_u16(tmpdev, > + "snps,gsbuscfg0-reqinfo", > + &gsbuscfg0_reqinfo); > + if (!ret) > + dwc->gsbuscfg0_reqinfo = gsbuscfg0_reqinfo; > + } > +} > + > /* check whether the core supports IMOD */ > bool dwc3_has_imod(struct dwc3 *dwc) > { > @@ -2090,6 +2126,8 @@ static int dwc3_probe(struct platform_device *pdev) > > dwc3_get_properties(dwc); > > + dwc3_get_software_properties(dwc); > + > dwc->reset = devm_reset_control_array_get_optional_shared(dev); > if (IS_ERR(dwc->reset)) { > ret = PTR_ERR(dwc->reset); > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h > index 3781c736c1a1..e04640662d36 100644 > --- a/drivers/usb/dwc3/core.h > +++ b/drivers/usb/dwc3/core.h > @@ -194,6 +194,10 @@ > #define DWC3_GSBUSCFG0_INCRBRSTENA (1 << 0) /* undefined length enable */ > #define DWC3_GSBUSCFG0_INCRBRST_MASK 0xff > > +/* Global SoC Bus Configuration Register: AHB-prot/AXI-cache/OCP-ReqInfo */ > +#define DWC3_GSBUSCFG0_REQINFO(n) (((n) & 0xffff) << 16) > +#define DWC3_GSBUSCFG0_REQINFO_DEF 0xffffffff Can we rename this to DWC3_GSBUSCFG0_REQINFO_UNSPECIFIED. "DEF" implies a valid default value. > + > /* Global Debug LSP MUX Select */ > #define DWC3_GDBGLSPMUX_ENDBC BIT(15) /* Host only */ > #define DWC3_GDBGLSPMUX_HOSTSELECT(n) ((n) & 0x3fff) > @@ -1153,6 +1157,9 @@ struct dwc3_scratchpad_array { > * @num_ep_resized: carries the current number endpoints which have had its tx > * fifo resized. > * @debug_root: root debugfs directory for this device to put its files in. > + * @gsbuscfg0_reqinfo: store GSBUSCFG0.DATRDREQINFO, DESRDREQINFO, > + * DATWRREQINFO, and DESWRREQINFO value passed from > + * glue driver. > */ > struct dwc3 { > struct work_struct drd_work; > @@ -1380,6 +1387,7 @@ struct dwc3 { > int last_fifo_depth; > int num_ep_resized; > struct dentry *debug_root; > + u32 gsbuscfg0_reqinfo; > }; > > #define INCRX_BURST_MODE 0 > diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c > index 6095f4dee6ce..bb4d894c16e9 100644 > --- a/drivers/usb/dwc3/dwc3-xilinx.c > +++ b/drivers/usb/dwc3/dwc3-xilinx.c > @@ -246,6 +246,31 @@ static const struct of_device_id dwc3_xlnx_of_match[] = { > }; > MODULE_DEVICE_TABLE(of, dwc3_xlnx_of_match); > > +static int dwc3_set_swnode(struct device *dev) > +{ > + struct device_node *np = dev->of_node, *dwc3_np; > + struct property_entry props[2]; > + int prop_idx = 0, ret = 0; > + > + dwc3_np = of_get_compatible_child(np, "snps,dwc3"); > + if (!dwc3_np) { > + ret = -ENODEV; > + dev_err(dev, "failed to find dwc3 core child\n"); > + return ret; > + } > + > + memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props)); > + if (of_dma_is_coherent(dwc3_np)) > + props[prop_idx++] = PROPERTY_ENTRY_U16("snps,gsbuscfg0-reqinfo", > + 0xffff); > + of_node_put(dwc3_np); > + > + if (prop_idx) > + ret = device_create_managed_software_node(dev, props, NULL); > + > + return ret; > +} > + > static int dwc3_xlnx_probe(struct platform_device *pdev) > { > struct dwc3_xlnx *priv_data; > @@ -288,6 +313,10 @@ static int dwc3_xlnx_probe(struct platform_device *pdev) > if (ret) > goto err_clk_put; > > + ret = dwc3_set_swnode(dev); > + if (ret) > + goto err_clk_put; > + > ret = of_platform_populate(np, NULL, NULL, dev); > if (ret) > goto err_clk_put; > > base-commit: 0b58e108042b0ed28a71cd7edf5175999955b233 > -- > 2.34.1 > Beside a couple very minor comments, this looks great to me! I'll be on vacation in a couple of days, can you send v5 soon? Thanks! Thinh
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index cb82557678dd..fe216a6ff652 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -23,6 +23,7 @@ #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/of.h> +#include <linux/of_address.h> #include <linux/of_graph.h> #include <linux/acpi.h> #include <linux/pinctrl/consumer.h> @@ -599,6 +600,18 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc) parms->hwparams9 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS9); } +static void dwc3_config_soc_bus(struct dwc3 *dwc) +{ + if (dwc->gsbuscfg0_reqinfo != DWC3_GSBUSCFG0_REQINFO_DEF) { + u32 reg; + + reg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0); + reg &= ~DWC3_GSBUSCFG0_REQINFO(~0); + reg |= DWC3_GSBUSCFG0_REQINFO(dwc->gsbuscfg0_reqinfo); + dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, reg); + } +} + static int dwc3_core_ulpi_init(struct dwc3 *dwc) { int intf; @@ -1338,6 +1351,8 @@ static int dwc3_core_init(struct dwc3 *dwc) dwc3_set_incr_burst_type(dwc); + dwc3_config_soc_bus(dwc); + ret = dwc3_phy_power_on(dwc); if (ret) goto err_exit_phy; @@ -1756,6 +1771,27 @@ static void dwc3_get_properties(struct dwc3 *dwc) dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num; } +static void dwc3_get_software_properties(struct dwc3 *dwc) +{ + struct device *tmpdev; + u16 gsbuscfg0_reqinfo; + int ret; + + dwc->gsbuscfg0_reqinfo = DWC3_GSBUSCFG0_REQINFO_DEF; + + /* + * Iterate over all parent nodes for finding swnode properties + * and non-DT (non-ABI) properties. + */ + for (tmpdev = dwc->dev; tmpdev; tmpdev = tmpdev->parent) { + ret = device_property_read_u16(tmpdev, + "snps,gsbuscfg0-reqinfo", + &gsbuscfg0_reqinfo); + if (!ret) + dwc->gsbuscfg0_reqinfo = gsbuscfg0_reqinfo; + } +} + /* check whether the core supports IMOD */ bool dwc3_has_imod(struct dwc3 *dwc) { @@ -2090,6 +2126,8 @@ static int dwc3_probe(struct platform_device *pdev) dwc3_get_properties(dwc); + dwc3_get_software_properties(dwc); + dwc->reset = devm_reset_control_array_get_optional_shared(dev); if (IS_ERR(dwc->reset)) { ret = PTR_ERR(dwc->reset); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 3781c736c1a1..e04640662d36 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -194,6 +194,10 @@ #define DWC3_GSBUSCFG0_INCRBRSTENA (1 << 0) /* undefined length enable */ #define DWC3_GSBUSCFG0_INCRBRST_MASK 0xff +/* Global SoC Bus Configuration Register: AHB-prot/AXI-cache/OCP-ReqInfo */ +#define DWC3_GSBUSCFG0_REQINFO(n) (((n) & 0xffff) << 16) +#define DWC3_GSBUSCFG0_REQINFO_DEF 0xffffffff + /* Global Debug LSP MUX Select */ #define DWC3_GDBGLSPMUX_ENDBC BIT(15) /* Host only */ #define DWC3_GDBGLSPMUX_HOSTSELECT(n) ((n) & 0x3fff) @@ -1153,6 +1157,9 @@ struct dwc3_scratchpad_array { * @num_ep_resized: carries the current number endpoints which have had its tx * fifo resized. * @debug_root: root debugfs directory for this device to put its files in. + * @gsbuscfg0_reqinfo: store GSBUSCFG0.DATRDREQINFO, DESRDREQINFO, + * DATWRREQINFO, and DESWRREQINFO value passed from + * glue driver. */ struct dwc3 { struct work_struct drd_work; @@ -1380,6 +1387,7 @@ struct dwc3 { int last_fifo_depth; int num_ep_resized; struct dentry *debug_root; + u32 gsbuscfg0_reqinfo; }; #define INCRX_BURST_MODE 0 diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c index 6095f4dee6ce..bb4d894c16e9 100644 --- a/drivers/usb/dwc3/dwc3-xilinx.c +++ b/drivers/usb/dwc3/dwc3-xilinx.c @@ -246,6 +246,31 @@ static const struct of_device_id dwc3_xlnx_of_match[] = { }; MODULE_DEVICE_TABLE(of, dwc3_xlnx_of_match); +static int dwc3_set_swnode(struct device *dev) +{ + struct device_node *np = dev->of_node, *dwc3_np; + struct property_entry props[2]; + int prop_idx = 0, ret = 0; + + dwc3_np = of_get_compatible_child(np, "snps,dwc3"); + if (!dwc3_np) { + ret = -ENODEV; + dev_err(dev, "failed to find dwc3 core child\n"); + return ret; + } + + memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props)); + if (of_dma_is_coherent(dwc3_np)) + props[prop_idx++] = PROPERTY_ENTRY_U16("snps,gsbuscfg0-reqinfo", + 0xffff); + of_node_put(dwc3_np); + + if (prop_idx) + ret = device_create_managed_software_node(dev, props, NULL); + + return ret; +} + static int dwc3_xlnx_probe(struct platform_device *pdev) { struct dwc3_xlnx *priv_data; @@ -288,6 +313,10 @@ static int dwc3_xlnx_probe(struct platform_device *pdev) if (ret) goto err_clk_put; + ret = dwc3_set_swnode(dev); + if (ret) + goto err_clk_put; + ret = of_platform_populate(np, NULL, NULL, dev); if (ret) goto err_clk_put;
The GSBUSCFG0 register bits [31:16] are used to configure the cache type settings of the descriptor and data write/read transfers (Cacheable, Bufferable/Posted). When CCI is enabled in the design, DWC3 core GSBUSCFG0 cache bits must be updated to support CCI enabled transfers in USB. To program GSBUSCFG0 cache bits create a software node property in AMD-xilinx dwc3 glue driver and pass it to dwc3 core. The core then reads this property value and configures it in dwc3_core_init() sequence. Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com> --- Changes for v4: - Pass swnode GSBUSCFG0 cache property from glue driver based on dma-coherent flag. - Introduce function dwc3_get_software_properties(). - Rename DWC3_GSBUSCFG0_REQINFO_MASK. - Use DWC3_GSBUSCFG0_REQINFO(n) and get rid of mask shift define. - Rename dwc3 member gsbuscfg0_reqinfo and change it type to u32 and define 0xffffffff as unspecified. - In comment dwc3_get_software_properties() description also mention "non-DT (non-ABI) properties". Changes for v3: - In v2 review as suggested by Thinh Nguyen, switch to swnode implementation for passing GSBUSCFG0 cache bits from AMD-xilinx dwc3 glue driver to core driver. Changes for v2: - Make GSBUSCFG0 configuration specific to AMD-xilinx platform. Taken reference from existing commit ec5eb43813a4 ("usb: dwc3: core: add support for realtek SoCs custom's global register start address") v1 link: https://lore.kernel.org/all/20231013053448.11056-1-piyush.mehta@amd.com --- drivers/usb/dwc3/core.c | 38 ++++++++++++++++++++++++++++++++++ drivers/usb/dwc3/core.h | 8 +++++++ drivers/usb/dwc3/dwc3-xilinx.c | 29 ++++++++++++++++++++++++++ 3 files changed, 75 insertions(+) base-commit: 0b58e108042b0ed28a71cd7edf5175999955b233