diff options
Diffstat (limited to 'drivers/reset')
| -rw-r--r-- | drivers/reset/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/reset/core.c | 71 | ||||
| -rw-r--r-- | drivers/reset/sti/Kconfig | 15 | ||||
| -rw-r--r-- | drivers/reset/sti/Makefile | 4 | ||||
| -rw-r--r-- | drivers/reset/sti/reset-stih415.c | 112 | ||||
| -rw-r--r-- | drivers/reset/sti/reset-stih416.c | 143 | ||||
| -rw-r--r-- | drivers/reset/sti/reset-syscfg.c | 186 | ||||
| -rw-r--r-- | drivers/reset/sti/reset-syscfg.h | 69 |
9 files changed, 564 insertions, 39 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index c9d04f79786..0615f50a14c 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -11,3 +11,5 @@ menuconfig RESET_CONTROLLER via GPIOs or SoC-internal reset controller modules. If unsure, say no. + +source "drivers/reset/sti/Kconfig" diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index cc29832c963..4f60caf750c 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_RESET_CONTROLLER) += core.o obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o +obj-$(CONFIG_ARCH_STI) += sti/ diff --git a/drivers/reset/core.c b/drivers/reset/core.c index d1b6089a0ef..baeaf82d40d 100644 --- a/drivers/reset/core.c +++ b/drivers/reset/core.c @@ -43,7 +43,7 @@ struct reset_control { * This simple translation function should be used for reset controllers * with 1:1 mapping, where reset lines can be indexed by number without gaps. */ -int of_reset_simple_xlate(struct reset_controller_dev *rcdev, +static int of_reset_simple_xlate(struct reset_controller_dev *rcdev, const struct of_phandle_args *reset_spec) { if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells)) @@ -54,7 +54,6 @@ int of_reset_simple_xlate(struct reset_controller_dev *rcdev, return reset_spec->args[0]; } -EXPORT_SYMBOL_GPL(of_reset_simple_xlate); /** * reset_controller_register - register a reset controller device @@ -127,15 +126,16 @@ int reset_control_deassert(struct reset_control *rstc) EXPORT_SYMBOL_GPL(reset_control_deassert); /** - * reset_control_get - Lookup and obtain a reference to a reset controller. - * @dev: device to be reset by the controller + * of_reset_control_get - Lookup and obtain a reference to a reset controller. + * @node: device to be reset by the controller * @id: reset line name * * Returns a struct reset_control or IS_ERR() condition containing errno. * * Use of id names is optional. */ -struct reset_control *reset_control_get(struct device *dev, const char *id) +struct reset_control *of_reset_control_get(struct device_node *node, + const char *id) { struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER); struct reset_controller_dev *r, *rcdev; @@ -144,13 +144,10 @@ struct reset_control *reset_control_get(struct device *dev, const char *id) int rstc_id; int ret; - if (!dev) - return ERR_PTR(-EINVAL); - if (id) - index = of_property_match_string(dev->of_node, + index = of_property_match_string(node, "reset-names", id); - ret = of_parse_phandle_with_args(dev->of_node, "resets", "#reset-cells", + ret = of_parse_phandle_with_args(node, "resets", "#reset-cells", index, &args); if (ret) return ERR_PTR(ret); @@ -167,7 +164,7 @@ struct reset_control *reset_control_get(struct device *dev, const char *id) if (!rcdev) { mutex_unlock(&reset_controller_list_mutex); - return ERR_PTR(-ENODEV); + return ERR_PTR(-EPROBE_DEFER); } rstc_id = rcdev->of_xlate(rcdev, &args); @@ -185,12 +182,35 @@ struct reset_control *reset_control_get(struct device *dev, const char *id) return ERR_PTR(-ENOMEM); } - rstc->dev = dev; rstc->rcdev = rcdev; rstc->id = rstc_id; return rstc; } +EXPORT_SYMBOL_GPL(of_reset_control_get); + +/** + * reset_control_get - Lookup and obtain a reference to a reset controller. + * @dev: device to be reset by the controller + * @id: reset line name + * + * Returns a struct reset_control or IS_ERR() condition containing errno. + * + * Use of id names is optional. + */ +struct reset_control *reset_control_get(struct device *dev, const char *id) +{ + struct reset_control *rstc; + + if (!dev) + return ERR_PTR(-EINVAL); + + rstc = of_reset_control_get(dev->of_node, id); + if (!IS_ERR(rstc)) + rstc->dev = dev; + + return rstc; +} EXPORT_SYMBOL_GPL(reset_control_get); /** @@ -243,33 +263,6 @@ struct reset_control *devm_reset_control_get(struct device *dev, const char *id) } EXPORT_SYMBOL_GPL(devm_reset_control_get); -static int devm_reset_control_match(struct device *dev, void *res, void *data) -{ - struct reset_control **rstc = res; - if (WARN_ON(!rstc || !*rstc)) - return 0; - return *rstc == data; -} - -/** - * devm_reset_control_put - resource managed reset_control_put() - * @rstc: reset controller to free - * - * Deallocate a reset control allocated withd devm_reset_control_get(). - * This function will not need to be called normally, as devres will take - * care of freeing the resource. - */ -void devm_reset_control_put(struct reset_control *rstc) -{ - int ret; - - ret = devres_release(rstc->dev, devm_reset_control_release, - devm_reset_control_match, rstc); - if (ret) - WARN_ON(ret); -} -EXPORT_SYMBOL_GPL(devm_reset_control_put); - /** * device_reset - find reset controller associated with the device * and perform reset diff --git a/drivers/reset/sti/Kconfig b/drivers/reset/sti/Kconfig new file mode 100644 index 00000000000..88d2d031661 --- /dev/null +++ b/drivers/reset/sti/Kconfig @@ -0,0 +1,15 @@ +if ARCH_STI + +config STI_RESET_SYSCFG + bool + select RESET_CONTROLLER + +config STIH415_RESET + bool + select STI_RESET_SYSCFG + +config STIH416_RESET + bool + select STI_RESET_SYSCFG + +endif diff --git a/drivers/reset/sti/Makefile b/drivers/reset/sti/Makefile new file mode 100644 index 00000000000..be1c9764787 --- /dev/null +++ b/drivers/reset/sti/Makefile @@ -0,0 +1,4 @@ +obj-$(CONFIG_STI_RESET_SYSCFG) += reset-syscfg.o + +obj-$(CONFIG_STIH415_RESET) += reset-stih415.o +obj-$(CONFIG_STIH416_RESET) += reset-stih416.o diff --git a/drivers/reset/sti/reset-stih415.c b/drivers/reset/sti/reset-stih415.c new file mode 100644 index 00000000000..e6f6c41abe1 --- /dev/null +++ b/drivers/reset/sti/reset-stih415.c @@ -0,0 +1,112 @@ +/* + * Copyright (C) 2013 STMicroelectronics (R&D) Limited + * Author: Stephen Gallimore <stephen.gallimore@st.com> + * Author: Srinivas Kandagatla <srinivas.kandagatla@st.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> + +#include <dt-bindings/reset-controller/stih415-resets.h> + +#include "reset-syscfg.h" + +/* + * STiH415 Peripheral powerdown definitions. + */ +static const char stih415_front[] = "st,stih415-front-syscfg"; +static const char stih415_rear[] = "st,stih415-rear-syscfg"; +static const char stih415_sbc[] = "st,stih415-sbc-syscfg"; +static const char stih415_lpm[] = "st,stih415-lpm-syscfg"; + +#define STIH415_PDN_FRONT(_bit) \ + _SYSCFG_RST_CH(stih415_front, SYSCFG_114, _bit, SYSSTAT_187, _bit) + +#define STIH415_PDN_REAR(_cntl, _stat) \ + _SYSCFG_RST_CH(stih415_rear, SYSCFG_336, _cntl, SYSSTAT_384, _stat) + +#define STIH415_SRST_REAR(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih415_rear, _reg, _bit) + +#define STIH415_SRST_SBC(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih415_sbc, _reg, _bit) + +#define STIH415_SRST_FRONT(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih415_front, _reg, _bit) + +#define STIH415_SRST_LPM(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih415_lpm, _reg, _bit) + +#define SYSCFG_114 0x38 /* Powerdown request EMI/NAND/Keyscan */ +#define SYSSTAT_187 0x15c /* Powerdown status EMI/NAND/Keyscan */ + +#define SYSCFG_336 0x90 /* Powerdown request USB/SATA/PCIe */ +#define SYSSTAT_384 0x150 /* Powerdown status USB/SATA/PCIe */ + +#define SYSCFG_376 0x130 /* Reset generator 0 control 0 */ +#define SYSCFG_166 0x108 /* Softreset Ethernet 0 */ +#define SYSCFG_31 0x7c /* Softreset Ethernet 1 */ +#define LPM_SYSCFG_1 0x4 /* Softreset IRB */ + +static const struct syscfg_reset_channel_data stih415_powerdowns[] = { + [STIH415_EMISS_POWERDOWN] = STIH415_PDN_FRONT(0), + [STIH415_NAND_POWERDOWN] = STIH415_PDN_FRONT(1), + [STIH415_KEYSCAN_POWERDOWN] = STIH415_PDN_FRONT(2), + [STIH415_USB0_POWERDOWN] = STIH415_PDN_REAR(0, 0), + [STIH415_USB1_POWERDOWN] = STIH415_PDN_REAR(1, 1), + [STIH415_USB2_POWERDOWN] = STIH415_PDN_REAR(2, 2), + [STIH415_SATA0_POWERDOWN] = STIH415_PDN_REAR(3, 3), + [STIH415_SATA1_POWERDOWN] = STIH415_PDN_REAR(4, 4), + [STIH415_PCIE_POWERDOWN] = STIH415_PDN_REAR(5, 8), +}; + +static const struct syscfg_reset_channel_data stih415_softresets[] = { + [STIH415_ETH0_SOFTRESET] = STIH415_SRST_FRONT(SYSCFG_166, 0), + [STIH415_ETH1_SOFTRESET] = STIH415_SRST_SBC(SYSCFG_31, 0), + [STIH415_IRB_SOFTRESET] = STIH415_SRST_LPM(LPM_SYSCFG_1, 6), + [STIH415_USB0_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 9), + [STIH415_USB1_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 10), + [STIH415_USB2_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 11), +}; + +static struct syscfg_reset_controller_data stih415_powerdown_controller = { + .wait_for_ack = true, + .nr_channels = ARRAY_SIZE(stih415_powerdowns), + .channels = stih415_powerdowns, +}; + +static struct syscfg_reset_controller_data stih415_softreset_controller = { + .wait_for_ack = false, + .active_low = true, + .nr_channels = ARRAY_SIZE(stih415_softresets), + .channels = stih415_softresets, +}; + +static struct of_device_id stih415_reset_match[] = { + { .compatible = "st,stih415-powerdown", + .data = &stih415_powerdown_controller, }, + { .compatible = "st,stih415-softreset", + .data = &stih415_softreset_controller, }, + {}, +}; + +static struct platform_driver stih415_reset_driver = { + .probe = syscfg_reset_probe, + .driver = { + .name = "reset-stih415", + .owner = THIS_MODULE, + .of_match_table = stih415_reset_match, + }, +}; + +static int __init stih415_reset_init(void) +{ + return platform_driver_register(&stih415_reset_driver); +} +arch_initcall(stih415_reset_init); diff --git a/drivers/reset/sti/reset-stih416.c b/drivers/reset/sti/reset-stih416.c new file mode 100644 index 00000000000..fe3bf02bdc8 --- /dev/null +++ b/drivers/reset/sti/reset-stih416.c @@ -0,0 +1,143 @@ +/* + * Copyright (C) 2013 STMicroelectronics (R&D) Limited + * Author: Stephen Gallimore <stephen.gallimore@st.com> + * Author: Srinivas Kandagatla <srinivas.kandagatla@st.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> + +#include <dt-bindings/reset-controller/stih416-resets.h> + +#include "reset-syscfg.h" + +/* + * STiH416 Peripheral powerdown definitions. + */ +static const char stih416_front[] = "st,stih416-front-syscfg"; +static const char stih416_rear[] = "st,stih416-rear-syscfg"; +static const char stih416_sbc[] = "st,stih416-sbc-syscfg"; +static const char stih416_lpm[] = "st,stih416-lpm-syscfg"; +static const char stih416_cpu[] = "st,stih416-cpu-syscfg"; + +#define STIH416_PDN_FRONT(_bit) \ + _SYSCFG_RST_CH(stih416_front, SYSCFG_1500, _bit, SYSSTAT_1578, _bit) + +#define STIH416_PDN_REAR(_cntl, _stat) \ + _SYSCFG_RST_CH(stih416_rear, SYSCFG_2525, _cntl, SYSSTAT_2583, _stat) + +#define SYSCFG_1500 0x7d0 /* Powerdown request EMI/NAND/Keyscan */ +#define SYSSTAT_1578 0x908 /* Powerdown status EMI/NAND/Keyscan */ + +#define SYSCFG_2525 0x834 /* Powerdown request USB/SATA/PCIe */ +#define SYSSTAT_2583 0x91c /* Powerdown status USB/SATA/PCIe */ + +#define SYSCFG_2552 0x8A0 /* Reset Generator control 0 */ +#define SYSCFG_1539 0x86c /* Softreset Ethernet 0 */ +#define SYSCFG_510 0x7f8 /* Softreset Ethernet 1 */ +#define LPM_SYSCFG_1 0x4 /* Softreset IRB */ +#define SYSCFG_2553 0x8a4 /* Softreset SATA0/1, PCIE0/1 */ +#define SYSCFG_7563 0x8cc /* MPE softresets 0 */ +#define SYSCFG_7564 0x8d0 /* MPE softresets 1 */ + +#define STIH416_SRST_CPU(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih416_cpu, _reg, _bit) + +#define STIH416_SRST_FRONT(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih416_front, _reg, _bit) + +#define STIH416_SRST_REAR(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih416_rear, _reg, _bit) + +#define STIH416_SRST_LPM(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih416_lpm, _reg, _bit) + +#define STIH416_SRST_SBC(_reg, _bit) \ + _SYSCFG_RST_CH_NO_ACK(stih416_sbc, _reg, _bit) + +static const struct syscfg_reset_channel_data stih416_powerdowns[] = { + [STIH416_EMISS_POWERDOWN] = STIH416_PDN_FRONT(0), + [STIH416_NAND_POWERDOWN] = STIH416_PDN_FRONT(1), + [STIH416_KEYSCAN_POWERDOWN] = STIH416_PDN_FRONT(2), + [STIH416_USB0_POWERDOWN] = STIH416_PDN_REAR(0, 0), + [STIH416_USB1_POWERDOWN] = STIH416_PDN_REAR(1, 1), + [STIH416_USB2_POWERDOWN] = STIH416_PDN_REAR(2, 2), + [STIH416_USB3_POWERDOWN] = STIH416_PDN_REAR(6, 5), + [STIH416_SATA0_POWERDOWN] = STIH416_PDN_REAR(3, 3), + [STIH416_SATA1_POWERDOWN] = STIH416_PDN_REAR(4, 4), + [STIH416_PCIE0_POWERDOWN] = STIH416_PDN_REAR(7, 9), + [STIH416_PCIE1_POWERDOWN] = STIH416_PDN_REAR(5, 8), +}; + +static const struct syscfg_reset_channel_data stih416_softresets[] = { + [STIH416_ETH0_SOFTRESET] = STIH416_SRST_FRONT(SYSCFG_1539, 0), + [STIH416_ETH1_SOFTRESET] = STIH416_SRST_SBC(SYSCFG_510, 0), + [STIH416_IRB_SOFTRESET] = STIH416_SRST_LPM(LPM_SYSCFG_1, 6), + [STIH416_USB0_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 9), + [STIH416_USB1_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 10), + [STIH416_USB2_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 11), + [STIH416_USB3_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 28), + [STIH416_SATA0_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 7), + [STIH416_SATA1_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 3), + [STIH416_PCIE0_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 15), + [STIH416_PCIE1_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 2), + [STIH416_AUD_DAC_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 14), + [STIH416_HDTVOUT_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 5), + [STIH416_VTAC_M_RX_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 25), + [STIH416_VTAC_A_RX_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 26), + [STIH416_SYNC_HD_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 5), + [STIH416_SYNC_SD_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 6), + [STIH416_BLITTER_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 10), + [STIH416_GPU_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 11), + [STIH416_VTAC_M_TX_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 18), + [STIH416_VTAC_A_TX_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 19), + [STIH416_VTG_AUX_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 21), + [STIH416_JPEG_DEC_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 23), + [STIH416_HVA_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 2), + [STIH416_COMPO_M_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 3), + [STIH416_COMPO_A_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 4), + [STIH416_VP8_DEC_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 10), + [STIH416_VTG_MAIN_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 16), +}; + +static struct syscfg_reset_controller_data stih416_powerdown_controller = { + .wait_for_ack = true, + .nr_channels = ARRAY_SIZE(stih416_powerdowns), + .channels = stih416_powerdowns, +}; + +static struct syscfg_reset_controller_data stih416_softreset_controller = { + .wait_for_ack = false, + .active_low = true, + .nr_channels = ARRAY_SIZE(stih416_softresets), + .channels = stih416_softresets, +}; + +static struct of_device_id stih416_reset_match[] = { + { .compatible = "st,stih416-powerdown", + .data = &stih416_powerdown_controller, }, + { .compatible = "st,stih416-softreset", + .data = &stih416_softreset_controller, }, + {}, +}; + +static struct platform_driver stih416_reset_driver = { + .probe = syscfg_reset_probe, + .driver = { + .name = "reset-stih416", + .owner = THIS_MODULE, + .of_match_table = stih416_reset_match, + }, +}; + +static int __init stih416_reset_init(void) +{ + return platform_driver_register(&stih416_reset_driver); +} +arch_initcall(stih416_reset_init); diff --git a/drivers/reset/sti/reset-syscfg.c b/drivers/reset/sti/reset-syscfg.c new file mode 100644 index 00000000000..a145cc066d4 --- /dev/null +++ b/drivers/reset/sti/reset-syscfg.c @@ -0,0 +1,186 @@ +/* + * Copyright (C) 2013 STMicroelectronics Limited + * Author: Stephen Gallimore <stephen.gallimore@st.com> + * + * Inspired by mach-imx/src.c + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/types.h> +#include <linux/of_device.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> + +#include "reset-syscfg.h" + +/** + * Reset channel regmap configuration + * + * @reset: regmap field for the channel's reset bit. + * @ack: regmap field for the channel's ack bit (optional). + */ +struct syscfg_reset_channel { + struct regmap_field *reset; + struct regmap_field *ack; +}; + +/** + * A reset controller which groups together a set of related reset bits, which + * may be located in different system configuration registers. + * + * @rst: base reset controller structure. + * @active_low: are the resets in this controller active low, i.e. clearing + * the reset bit puts the hardware into reset. + * @channels: An array of reset channels for this controller. + */ +struct syscfg_reset_controller { + struct reset_controller_dev rst; + bool active_low; + struct syscfg_reset_channel *channels; +}; + +#define to_syscfg_reset_controller(_rst) \ + container_of(_rst, struct syscfg_reset_controller, rst) + +static int syscfg_reset_program_hw(struct reset_controller_dev *rcdev, + unsigned long idx, int assert) +{ + struct syscfg_reset_controller *rst = to_syscfg_reset_controller(rcdev); + const struct syscfg_reset_channel *ch; + u32 ctrl_val = rst->active_low ? !assert : !!assert; + int err; + + if (idx >= rcdev->nr_resets) + return -EINVAL; + + ch = &rst->channels[idx]; + + err = regmap_field_write(ch->reset, ctrl_val); + if (err) + return err; + + if (ch->ack) { + unsigned long timeout = jiffies + msecs_to_jiffies(1000); + u32 ack_val; + + while (true) { + err = regmap_field_read(ch->ack, &ack_val); + if (err) + return err; + + if (ack_val == ctrl_val) + break; + + if (time_after(jiffies, timeout)) + return -ETIME; + + cpu_relax(); + } + } + + return 0; +} + +static int syscfg_reset_assert(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + return syscfg_reset_program_hw(rcdev, idx, true); +} + +static int syscfg_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + return syscfg_reset_program_hw(rcdev, idx, false); +} + +static int syscfg_reset_dev(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + int err = syscfg_reset_assert(rcdev, idx); + if (err) + return err; + + return syscfg_reset_deassert(rcdev, idx); +} + +static struct reset_control_ops syscfg_reset_ops = { + .reset = syscfg_reset_dev, + .assert = syscfg_reset_assert, + .deassert = syscfg_reset_deassert, +}; + +static int syscfg_reset_controller_register(struct device *dev, + const struct syscfg_reset_controller_data *data) +{ + struct syscfg_reset_controller *rc; + size_t size; + int i, err; + + rc = devm_kzalloc(dev, sizeof(*rc), GFP_KERNEL); + if (!rc) + return -ENOMEM; + + size = sizeof(struct syscfg_reset_channel) * data->nr_channels; + + rc->channels = devm_kzalloc(dev, size, GFP_KERNEL); + if (!rc->channels) + return -ENOMEM; + + rc->rst.ops = &syscfg_reset_ops, + rc->rst.of_node = dev->of_node; + rc->rst.nr_resets = data->nr_channels; + rc->active_low = data->active_low; + + for (i = 0; i < data->nr_channels; i++) { + struct regmap *map; + struct regmap_field *f; + const char *compatible = data->channels[i].compatible; + + map = syscon_regmap_lookup_by_compatible(compatible); + if (IS_ERR(map)) + return PTR_ERR(map); + + f = devm_regmap_field_alloc(dev, map, data->channels[i].reset); + if (IS_ERR(f)) + return PTR_ERR(f); + + rc->channels[i].reset = f; + + if (!data->wait_for_ack) + continue; + + f = devm_regmap_field_alloc(dev, map, data->channels[i].ack); + if (IS_ERR(f)) + return PTR_ERR(f); + + rc->channels[i].ack = f; + } + + err = reset_controller_register(&rc->rst); + if (!err) + dev_info(dev, "registered\n"); + + return err; +} + +int syscfg_reset_probe(struct platform_device *pdev) +{ + struct device *dev = pdev ? &pdev->dev : NULL; + const struct of_device_id *match; + + if (!dev || !dev->driver) + return -ENODEV; + + match = of_match_device(dev->driver->of_match_table, dev); + if (!match || !match->data) + return -EINVAL; + + return syscfg_reset_controller_register(dev, match->data); +} diff --git a/drivers/reset/sti/reset-syscfg.h b/drivers/reset/sti/reset-syscfg.h new file mode 100644 index 00000000000..2cc2283bac4 --- /dev/null +++ b/drivers/reset/sti/reset-syscfg.h @@ -0,0 +1,69 @@ +/* + * Copyright (C) 2013 STMicroelectronics (R&D) Limited + * Author: Stephen Gallimore <stephen.gallimore@st.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#ifndef __STI_RESET_SYSCFG_H +#define __STI_RESET_SYSCFG_H + +#include <linux/device.h> +#include <linux/regmap.h> +#include <linux/reset-controller.h> + +/** + * Reset channel description for a system configuration register based + * reset controller. + * + * @compatible: Compatible string of the syscon regmap containing this + * channel's control and ack (status) bits. + * @reset: Regmap field description of the channel's reset bit. + * @ack: Regmap field description of the channel's acknowledge bit. + */ +struct syscfg_reset_channel_data { + const char *compatible; + struct reg_field reset; + struct reg_field ack; +}; + +#define _SYSCFG_RST_CH(_c, _rr, _rb, _ar, _ab) \ + { .compatible = _c, \ + .reset = REG_FIELD(_rr, _rb, _rb), \ + .ack = REG_FIELD(_ar, _ab, _ab), } + +#define _SYSCFG_RST_CH_NO_ACK(_c, _rr, _rb) \ + { .compatible = _c, \ + .reset = REG_FIELD(_rr, _rb, _rb), } + +/** + * Description of a system configuration register based reset controller. + * + * @wait_for_ack: The controller will wait for reset assert and de-assert to + * be "ack'd" in a channel's ack field. + * @active_low: Are the resets in this controller active low, i.e. clearing + * the reset bit puts the hardware into reset. + * @nr_channels: The number of reset channels in this controller. + * @channels: An array of reset channel descriptions. + */ +struct syscfg_reset_controller_data { + bool wait_for_ack; + bool active_low; + int nr_channels; + const struct syscfg_reset_channel_data *channels; +}; + +/** + * syscfg_reset_probe(): platform device probe function used by syscfg + * reset controller drivers. This registers a reset + * controller configured by the OF match data for + * the compatible device which should be of type + * "struct syscfg_reset_controller_data". + * + * @pdev: platform device + */ +int syscfg_reset_probe(struct platform_device *pdev); + +#endif /* __STI_RESET_SYSCFG_H */ |