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usb: phy: samsung: Add support to set pmu isolation
Adding support to parse device node data in order to get required properties to set pmu isolation for usb-phy. Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
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2 changed files with 177 additions and 22 deletions
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@ -9,3 +9,39 @@ Required properties:
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- compatible : should be "samsung,exynos4210-usbphy"
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- reg : base physical address of the phy registers and length of memory mapped
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region.
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Optional properties:
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- #address-cells: should be '1' when usbphy node has a child node with 'reg'
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property.
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- #size-cells: should be '1' when usbphy node has a child node with 'reg'
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property.
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- ranges: allows valid translation between child's address space and parent's
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address space.
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- The child node 'usbphy-sys' to the node 'usbphy' is for the system controller
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interface for usb-phy. It should provide the following information required by
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usb-phy controller to control phy.
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- reg : base physical address of PHY_CONTROL registers.
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The size of this register is the total sum of size of all PHY_CONTROL
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registers that the SoC has. For example, the size will be
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'0x4' in case we have only one PHY_CONTROL register (e.g.
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OTHERS register in S3C64XX or USB_PHY_CONTROL register in S5PV210)
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and, '0x8' in case we have two PHY_CONTROL registers (e.g.
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USBDEVICE_PHY_CONTROL and USBHOST_PHY_CONTROL registers in exynos4x).
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and so on.
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Example:
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- Exynos4210
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usbphy@125B0000 {
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#address-cells = <1>;
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#size-cells = <1>;
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compatible = "samsung,exynos4210-usbphy";
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reg = <0x125B0000 0x100>;
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ranges;
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usbphy-sys {
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/* USB device and host PHY_CONTROL registers */
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reg = <0x10020704 0x8>;
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};
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};
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@ -24,6 +24,7 @@
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/usb/otg.h>
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#include <linux/platform_data/samsung-usbphy.h>
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@ -60,20 +61,46 @@
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#define MHZ (1000*1000)
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#endif
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#define S3C64XX_USBPHY_ENABLE (0x1 << 16)
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#define EXYNOS_USBPHY_ENABLE (0x1 << 0)
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enum samsung_cpu_type {
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TYPE_S3C64XX,
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TYPE_EXYNOS4210,
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};
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/*
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* struct samsung_usbphy_drvdata - driver data for various SoC variants
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* @cpu_type: machine identifier
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* @devphy_en_mask: device phy enable mask for PHY CONTROL register
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* @devphy_reg_offset: offset to DEVICE PHY CONTROL register from
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* mapped address of system controller.
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*
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* Here we have a separate mask for device type phy.
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* Having different masks for host and device type phy helps
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* in setting independent masks in case of SoCs like S5PV210,
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* in which PHY0 and PHY1 enable bits belong to same register
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* placed at position 0 and 1 respectively.
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* Although for newer SoCs like exynos these bits belong to
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* different registers altogether placed at position 0.
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*/
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struct samsung_usbphy_drvdata {
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int cpu_type;
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int devphy_en_mask;
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u32 devphy_reg_offset;
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};
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/*
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* struct samsung_usbphy - transceiver driver state
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* @phy: transceiver structure
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* @plat: platform data
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* @dev: The parent device supplied to the probe function
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* @clk: usb phy clock
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* @regs: usb phy register memory base
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* @regs: usb phy controller registers memory base
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* @pmuregs: USB device PHY_CONTROL register memory base
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* @ref_clk_freq: reference clock frequency selection
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* @cpu_type: machine identifier
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* @drv_data: driver data available for different SoCs
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* @lock: lock for phy operations
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*/
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struct samsung_usbphy {
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struct usb_phy phy;
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@ -81,12 +108,66 @@ struct samsung_usbphy {
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struct device *dev;
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struct clk *clk;
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void __iomem *regs;
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void __iomem *pmuregs;
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int ref_clk_freq;
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int cpu_type;
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const struct samsung_usbphy_drvdata *drv_data;
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spinlock_t lock;
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};
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#define phy_to_sphy(x) container_of((x), struct samsung_usbphy, phy)
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static int samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
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{
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struct device_node *usbphy_sys;
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/* Getting node for system controller interface for usb-phy */
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usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
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if (!usbphy_sys) {
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dev_err(sphy->dev, "No sys-controller interface for usb-phy\n");
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return -ENODEV;
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}
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sphy->pmuregs = of_iomap(usbphy_sys, 0);
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of_node_put(usbphy_sys);
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if (sphy->pmuregs == NULL) {
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dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
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return -ENODEV;
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}
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return 0;
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}
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/*
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* Set isolation here for phy.
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* Here 'on = true' would mean USB PHY block is isolated, hence
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* de-activated and vice-versa.
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*/
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static void samsung_usbphy_set_isolation(struct samsung_usbphy *sphy, bool on)
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{
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void __iomem *reg;
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u32 reg_val;
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u32 en_mask;
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if (!sphy->pmuregs) {
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dev_warn(sphy->dev, "Can't set pmu isolation\n");
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return;
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}
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reg = sphy->pmuregs + sphy->drv_data->devphy_reg_offset;
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en_mask = sphy->drv_data->devphy_en_mask;
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reg_val = readl(reg);
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if (on)
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reg_val &= ~en_mask;
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else
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reg_val |= en_mask;
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writel(reg_val, reg);
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}
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/*
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* Returns reference clock frequency selection value
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*/
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@ -112,7 +193,7 @@ static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
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refclk_freq = PHYCLK_CLKSEL_48M;
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break;
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default:
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if (sphy->cpu_type == TYPE_S3C64XX)
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if (sphy->drv_data->cpu_type == TYPE_S3C64XX)
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refclk_freq = PHYCLK_CLKSEL_48M;
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else
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refclk_freq = PHYCLK_CLKSEL_24M;
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@ -135,7 +216,7 @@ static void samsung_usbphy_enable(struct samsung_usbphy *sphy)
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phypwr = readl(regs + SAMSUNG_PHYPWR);
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rstcon = readl(regs + SAMSUNG_RSTCON);
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switch (sphy->cpu_type) {
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switch (sphy->drv_data->cpu_type) {
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case TYPE_S3C64XX:
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phyclk &= ~PHYCLK_COMMON_ON_N;
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phypwr &= ~PHYPWR_NORMAL_MASK;
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@ -165,7 +246,7 @@ static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
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phypwr = readl(regs + SAMSUNG_PHYPWR);
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switch (sphy->cpu_type) {
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switch (sphy->drv_data->cpu_type) {
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case TYPE_S3C64XX:
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phypwr |= PHYPWR_NORMAL_MASK;
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break;
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@ -185,6 +266,7 @@ static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
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static int samsung_usbphy_init(struct usb_phy *phy)
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{
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struct samsung_usbphy *sphy;
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unsigned long flags;
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int ret = 0;
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sphy = phy_to_sphy(phy);
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@ -196,13 +278,19 @@ static int samsung_usbphy_init(struct usb_phy *phy)
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return ret;
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}
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spin_lock_irqsave(&sphy->lock, flags);
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/* Disable phy isolation */
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if (sphy->plat && sphy->plat->pmu_isolation)
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sphy->plat->pmu_isolation(false);
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else
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samsung_usbphy_set_isolation(sphy, false);
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/* Initialize usb phy registers */
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samsung_usbphy_enable(sphy);
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spin_unlock_irqrestore(&sphy->lock, flags);
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/* Disable the phy clock */
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clk_disable_unprepare(sphy->clk);
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return ret;
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@ -214,6 +302,7 @@ static int samsung_usbphy_init(struct usb_phy *phy)
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static void samsung_usbphy_shutdown(struct usb_phy *phy)
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{
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struct samsung_usbphy *sphy;
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unsigned long flags;
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sphy = phy_to_sphy(phy);
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@ -222,44 +311,47 @@ static void samsung_usbphy_shutdown(struct usb_phy *phy)
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return;
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}
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spin_lock_irqsave(&sphy->lock, flags);
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/* De-initialize usb phy registers */
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samsung_usbphy_disable(sphy);
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/* Enable phy isolation */
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if (sphy->plat && sphy->plat->pmu_isolation)
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sphy->plat->pmu_isolation(true);
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else
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samsung_usbphy_set_isolation(sphy, true);
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spin_unlock_irqrestore(&sphy->lock, flags);
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clk_disable_unprepare(sphy->clk);
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}
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static const struct of_device_id samsung_usbphy_dt_match[];
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static inline int samsung_usbphy_get_driver_data(struct platform_device *pdev)
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static inline const struct samsung_usbphy_drvdata
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*samsung_usbphy_get_driver_data(struct platform_device *pdev)
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{
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if (pdev->dev.of_node) {
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const struct of_device_id *match;
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match = of_match_node(samsung_usbphy_dt_match,
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pdev->dev.of_node);
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return (int) match->data;
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return match->data;
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}
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return platform_get_device_id(pdev)->driver_data;
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return (struct samsung_usbphy_drvdata *)
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platform_get_device_id(pdev)->driver_data;
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}
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static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
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{
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struct samsung_usbphy *sphy;
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struct samsung_usbphy_data *pdata;
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struct samsung_usbphy_data *pdata = pdev->dev.platform_data;
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struct device *dev = &pdev->dev;
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struct resource *phy_mem;
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void __iomem *phy_base;
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struct clk *clk;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "%s: no platform data defined\n", __func__);
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return -EINVAL;
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}
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int ret;
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phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!phy_mem) {
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return PTR_ERR(clk);
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}
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sphy->dev = &pdev->dev;
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sphy->dev = dev;
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if (dev->of_node) {
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ret = samsung_usbphy_parse_dt(sphy);
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if (ret < 0)
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return ret;
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} else {
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if (!pdata) {
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dev_err(dev, "no platform data specified\n");
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return -EINVAL;
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}
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}
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sphy->plat = pdata;
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sphy->regs = phy_base;
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sphy->clk = clk;
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sphy->phy.label = "samsung-usbphy";
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sphy->phy.init = samsung_usbphy_init;
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sphy->phy.shutdown = samsung_usbphy_shutdown;
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sphy->cpu_type = samsung_usbphy_get_driver_data(pdev);
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sphy->drv_data = samsung_usbphy_get_driver_data(pdev);
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sphy->ref_clk_freq = samsung_usbphy_get_refclk_freq(sphy);
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spin_lock_init(&sphy->lock);
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platform_set_drvdata(pdev, sphy);
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return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
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@ -305,17 +411,30 @@ static int __exit samsung_usbphy_remove(struct platform_device *pdev)
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usb_remove_phy(&sphy->phy);
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if (sphy->pmuregs)
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iounmap(sphy->pmuregs);
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return 0;
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}
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static const struct samsung_usbphy_drvdata usbphy_s3c64xx = {
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.cpu_type = TYPE_S3C64XX,
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.devphy_en_mask = S3C64XX_USBPHY_ENABLE,
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};
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static const struct samsung_usbphy_drvdata usbphy_exynos4 = {
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.cpu_type = TYPE_EXYNOS4210,
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.devphy_en_mask = EXYNOS_USBPHY_ENABLE,
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};
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#ifdef CONFIG_OF
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static const struct of_device_id samsung_usbphy_dt_match[] = {
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{
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.compatible = "samsung,s3c64xx-usbphy",
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.data = (void *)TYPE_S3C64XX,
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.data = &usbphy_s3c64xx,
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}, {
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.compatible = "samsung,exynos4210-usbphy",
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.data = (void *)TYPE_EXYNOS4210,
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.data = &usbphy_exynos4,
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},
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{},
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};
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static struct platform_device_id samsung_usbphy_driver_ids[] = {
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{
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.name = "s3c64xx-usbphy",
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.driver_data = TYPE_S3C64XX,
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.driver_data = (unsigned long)&usbphy_s3c64xx,
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}, {
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.name = "exynos4210-usbphy",
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.driver_data = TYPE_EXYNOS4210,
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.driver_data = (unsigned long)&usbphy_exynos4,
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},
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{},
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};
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