From: Patrice Chotard patrice.chotard@st.com
Use an array to save enabled clocks reference and deasserted resets in order to respectively disabled and asserted them in case of error during probe() or during driver removal.
Signed-off-by: Patrice Chotard patrice.chotard@st.com ---
v8: _ replace devm_kmalloc() by devm_kcalloc() _ fix error path by propagating initial error code until the end of probe()
v7: _ replace clk_count() and reset_count() by ofnode_count_phandle_with_args()
v6: _ none
v5: _ none
v4: _ update the memory allocation for deasserted resets and enabled clocks reference list. Replace lists by arrays. _ usage of new RESET and CLOCK methods clk_count(), reset_count(), reset_assert_all() and clk_disable_all().
v3: _ keep enabled clocks and deasserted resets reference in list in order to disable clock or assert resets in error path or in .remove callback _ use struct generic_ehci * instead of struct udevice * as parameter for ehci_release_resets() and ehci_release_clocks()
drivers/usb/host/ehci-generic.c | 120 ++++++++++++++++++++++++++++++++-------- 1 file changed, 97 insertions(+), 23 deletions(-)
diff --git a/drivers/usb/host/ehci-generic.c b/drivers/usb/host/ehci-generic.c index 2116ae1..5cc7f2a 100644 --- a/drivers/usb/host/ehci-generic.c +++ b/drivers/usb/host/ehci-generic.c @@ -6,6 +6,7 @@
#include <common.h> #include <clk.h> +#include <dm/ofnode.h> #include <reset.h> #include <asm/io.h> #include <dm.h> @@ -18,43 +19,116 @@ */ struct generic_ehci { struct ehci_ctrl ctrl; + struct clk *clocks; + struct reset_ctl *resets; + int clock_count; + int reset_count; };
static int ehci_usb_probe(struct udevice *dev) { + struct generic_ehci *priv = dev_get_priv(dev); struct ehci_hccr *hccr; struct ehci_hcor *hcor; - int i; - - for (i = 0; ; i++) { - struct clk clk; - int ret; - - ret = clk_get_by_index(dev, i, &clk); - if (ret < 0) - break; - if (clk_enable(&clk)) - error("failed to enable clock %d\n", i); - clk_free(&clk); + int i, err, ret, clock_nb, reset_nb; + + err = 0; + priv->clock_count = 0; + clock_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "clocks", + "#clock-cells"); + if (clock_nb > 0) { + priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk), + GFP_KERNEL); + if (!priv->clocks) + return -ENOMEM; + + for (i = 0; i < clock_nb; i++) { + err = clk_get_by_index(dev, i, &priv->clocks[i]); + + if (err < 0) + break; + err = clk_enable(&priv->clocks[i]); + if (err) { + error("failed to enable clock %d\n", i); + clk_free(&priv->clocks[i]); + goto clk_err; + } + priv->clock_count++; + clk_free(&priv->clocks[i]); + } + } else { + if (clock_nb != -ENOENT) { + error("failed to get clock phandle(%d)\n", clock_nb); + return clock_nb; + } }
- for (i = 0; ; i++) { - struct reset_ctl reset; - int ret; + priv->reset_count = 0; + reset_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "resets", + "#reset-cells"); + if (reset_nb > 0) { + priv->resets = devm_kcalloc(dev, reset_nb, + sizeof(struct reset_ctl), + GFP_KERNEL); + if (!priv->resets) + return -ENOMEM; + + for (i = 0; i < reset_nb; i++) { + err = reset_get_by_index(dev, i, &priv->resets[i]); + if (err < 0) + break;
- ret = reset_get_by_index(dev, i, &reset); - if (ret < 0) - break; - if (reset_deassert(&reset)) - error("failed to deassert reset %d\n", i); - reset_free(&reset); + if (reset_deassert(&priv->resets[i])) { + error("failed to deassert reset %d\n", i); + reset_free(&priv->resets[i]); + goto reset_err; + } + priv->reset_count++; + reset_free(&priv->resets[i]); + } + } else { + if (reset_nb != -ENOENT) { + error("failed to get reset phandle(%d)\n", reset_nb); + goto clk_err; + } }
hccr = map_physmem(devfdt_get_addr(dev), 0x100, MAP_NOCACHE); hcor = (struct ehci_hcor *)((uintptr_t)hccr + HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
- return ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST); + err = ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST); + if (err) + goto reset_err; + + return 0; + +reset_err: + ret = reset_assert_all(priv->resets, priv->reset_count); + if (ret) + error("failed to assert all resets\n"); +clk_err: + ret = clk_disable_all(priv->clocks, priv->clock_count); + if (ret) + error("failed to disable all clocks\n"); + + return err; +} + +static int ehci_usb_remove(struct udevice *dev) +{ + struct generic_ehci *priv = dev_get_priv(dev); + int ret; + + ret = ehci_deregister(dev); + if (ret) + return ret; + + ret = reset_assert_all(priv->resets, priv->reset_count); + if (ret) + return ret; + + return clk_disable_all(priv->clocks, priv->clock_count); }
static const struct udevice_id ehci_usb_ids[] = { @@ -67,7 +141,7 @@ U_BOOT_DRIVER(ehci_generic) = { .id = UCLASS_USB, .of_match = ehci_usb_ids, .probe = ehci_usb_probe, - .remove = ehci_deregister, + .remove = ehci_usb_remove, .ops = &ehci_usb_ops, .priv_auto_alloc_size = sizeof(struct generic_ehci), .flags = DM_FLAG_ALLOC_PRIV_DMA,