This adds DT support for TI DA8xx/OMAP-L1x/AM17xx/AM18xx MUSB driver Signed-off-by: Petr Kulhavy <p...@barix.com> Tested-by: Petr Kulhavy <p...@barix.com> --- v1: <initial>
v2: - using standard MUSB properties "dr_mode", "mentor,power", "mentor,num-eps", "mentor,multipoint", "mentor,ram-bits" - using "ti," prefix instead of "da8xx," for specific property names - no wilcards in compatibility string - using CFGCHIP2_USB2PHYCLKMUX_SHIFT instead of CFGCHIP2_USB2PHYCLKMUX_OFFSET v3: - DMA mask initialization corrected - removed extra #ifdef CONFIG_OF v4: - compatibility string set to "ti,da830-musb" - "mentor,num-eps", "mentor,multipoint", "mentor,ram-bits" properties removed and hardcoded - "ti,phy20-clkmux-cfg" renamed to "ti,phy20-clkmux-pll" and changed to boolean - removed use of the DA8XX_SYSCFG0_VIRT macro v5: - using CFGCHIP2_REFFREQ_ in get_phy_refclk_cfg() - simplified initialization of the hard coded config parameters - optimization CFGCHIP2 register update v6: - using "ti,usb2-phy-" prefix instead of "ti,phy20-" for the specific properties - optimization CFGCHIP2 register update v7: - pdata::power hard coded to 500mA v8: - USB maximum power modelled via a regulator "vbus-supply" - "ti,usb2-phy-refclock-frequency" renamed to "ti,usb2-phy-refclock-hz" - "ti,usb2-phy-clkmux-pll" changed to "ti,usb2-phy-clkmux-refclkin" and the boolean meaning inverted to reflect the more common case v9: - power regulator used only to get the current + drivers/usb/musb/da8xx.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c index b03d3b8..aabd33a 100644 --- a/drivers/usb/musb/da8xx.c +++ b/drivers/usb/musb/da8xx.c @@ -6,6 +6,9 @@ * Based on the DaVinci "glue layer" code. * Copyright (C) 2005-2006 by Texas Instruments * + * DT support + * Copyright (c) 2016 Petr Kulhavy, Barix AG <p...@barix.com> + * * This file is part of the Inventra Controller Driver for Linux. * * The Inventra Controller Driver for Linux is free software; you @@ -33,9 +36,11 @@ #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <linux/usb/usb_phy_generic.h> +#include <linux/regulator/consumer.h> #include <mach/da8xx.h> #include <linux/platform_data/usb-davinci.h> +#include <linux/of_platform.h> #include "musb_core.h" @@ -134,6 +139,55 @@ static inline void phy_off(void) __raw_writel(cfgchip2, CFGCHIP2); } +static inline int get_phy_refclk_cfg(struct device_node *np) +{ + u32 freq; + + if (of_property_read_u32(np, "ti,usb2-phy-refclock-hz", &freq)) + return -EINVAL; + + switch (freq) { + case 12000000: + return CFGCHIP2_REFFREQ_12MHZ; + case 13000000: + return CFGCHIP2_REFFREQ_13MHZ; + case 19200000: + return CFGCHIP2_REFFREQ_19_2MHZ; + case 20000000: + return CFGCHIP2_REFFREQ_20MHZ; + case 24000000: + return CFGCHIP2_REFFREQ_24MHZ; + case 26000000: + return CFGCHIP2_REFFREQ_26MHZ; + case 38400000: + return CFGCHIP2_REFFREQ_38_4MHZ; + case 40000000: + return CFGCHIP2_REFFREQ_40MHZ; + case 48000000: + return CFGCHIP2_REFFREQ_48MHZ; + default: + return -EINVAL; + } +} + +static inline u8 get_vbus_power(struct device *dev) +{ + struct regulator *vbus_supply; + int current_uA; + + vbus_supply = regulator_get(dev, "vbus"); + if (IS_ERR(vbus_supply)) + return 255; + + current_uA = regulator_get_current_limit(vbus_supply); + regulator_put(vbus_supply); + + if (current_uA <= 0 || current_uA > 510000) + return 255; + + return current_uA / 1000; +} + /* * Because we don't set CTRL.UINT, it's "important" to: * - not read/write INTRUSB/INTRUSBE (except during @@ -482,6 +536,12 @@ static const struct platform_device_info da8xx_dev_info = { .dma_mask = DMA_BIT_MASK(32), }; +static const struct musb_hdrc_config da8xx_config = { + .ram_bits = 10, + .num_eps = 5, + .multipoint = 1, +}; + static int da8xx_probe(struct platform_device *pdev) { struct resource musb_resources[2]; @@ -490,6 +550,7 @@ static int da8xx_probe(struct platform_device *pdev) struct da8xx_glue *glue; struct platform_device_info pinfo; struct clk *clk; + struct device_node *np = pdev->dev.of_node; int ret = -ENOMEM; @@ -515,6 +576,42 @@ static int da8xx_probe(struct platform_device *pdev) glue->dev = &pdev->dev; glue->clk = clk; + if (IS_ENABLED(CONFIG_OF) && np) { + int refclk_cfg; + u32 cfgchip2; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + ret = -ENOMEM; + goto err5; + } + + pdata->config = &da8xx_config; + pdata->mode = musb_get_mode(&pdev->dev); + pdata->power = get_vbus_power(&pdev->dev); + + refclk_cfg = get_phy_refclk_cfg(np); + if (refclk_cfg < 0) { + dev_err(&pdev->dev, + "PHY 2.0 clock frequency invalid or undefined\n"); + ret = -EINVAL; + goto err5; + } + + cfgchip2 = __raw_readl(CFGCHIP2); + cfgchip2 &= ~(CFGCHIP2_USB2PHYCLKMUX | CFGCHIP2_REFFREQ); + + /* + * optional parameter reference clock source + * false = use PLL, true = use the external clock pin + */ + if (!of_property_read_bool(np, "ti,usb2-phy-clkmux-refclkin")) + cfgchip2 |= CFGCHIP2_USB2PHYCLKMUX; + cfgchip2 |= refclk_cfg; + + __raw_writel(cfgchip2, CFGCHIP2); + } + pdata->platform_ops = &da8xx_ops; glue->phy = usb_phy_generic_register(); @@ -582,11 +679,20 @@ static int da8xx_remove(struct platform_device *pdev) return 0; } +static const struct of_device_id da8xx_id_table[] = { + { + .compatible = "ti,da830-musb", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, da8xx_id_table); + static struct platform_driver da8xx_driver = { .probe = da8xx_probe, .remove = da8xx_remove, .driver = { .name = "musb-da8xx", + .of_match_table = of_match_ptr(da8xx_id_table), }, }; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html