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author | Stephen Gallimore <stephen.gallimore@st.com> | 2013-08-07 16:31:25 +0100 |
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committer | Srinivas Kandagatla <srinivas.kandagatla@st.com> | 2014-03-11 10:49:40 +0000 |
commit | 1f42c290c3d91b5f9f60bd503b12ba06c7f47021 (patch) | |
tree | a0d8ad78c3c9bccd77a8388e9be540fab12b7b74 /drivers/reset/sti | |
parent | e5d76075d9300a483619f7f308a693311af9c2cb (diff) | |
download | op-kernel-dev-1f42c290c3d91b5f9f60bd503b12ba06c7f47021.zip op-kernel-dev-1f42c290c3d91b5f9f60bd503b12ba06c7f47021.tar.gz |
drivers: reset: Reset controller driver for STiH415
This patch adds a reset controller platform driver for the STiH415
SoC. This initial version provides a compatible driver for the
"st,stih415-powerdown" device, which registers a system configuration
register based reset controller that controls the powerdown state of
hardware such as the on-chip USB host controllers.
Signed-off-by: Stephen Gallimore <stephen.gallimore@st.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/reset/sti')
-rw-r--r-- | drivers/reset/sti/Kconfig | 4 | ||||
-rw-r--r-- | drivers/reset/sti/Makefile | 3 | ||||
-rw-r--r-- | drivers/reset/sti/reset-stih415.c | 77 |
3 files changed, 84 insertions, 0 deletions
diff --git a/drivers/reset/sti/Kconfig b/drivers/reset/sti/Kconfig index ba13796..ef6654a 100644 --- a/drivers/reset/sti/Kconfig +++ b/drivers/reset/sti/Kconfig @@ -4,4 +4,8 @@ config STI_RESET_SYSCFG bool select RESET_CONTROLLER +config STIH415_RESET + bool + select STI_RESET_SYSCFG + endif diff --git a/drivers/reset/sti/Makefile b/drivers/reset/sti/Makefile index c4a51d9..fce4433 100644 --- a/drivers/reset/sti/Makefile +++ b/drivers/reset/sti/Makefile @@ -1 +1,4 @@ obj-$(CONFIG_STI_RESET_SYSCFG) += reset-syscfg.o + +# SoC specific reset devices +obj-$(CONFIG_STIH415_RESET) += reset-stih415.o diff --git a/drivers/reset/sti/reset-stih415.c b/drivers/reset/sti/reset-stih415.c new file mode 100644 index 0000000..56c2146 --- /dev/null +++ b/drivers/reset/sti/reset-stih415.c @@ -0,0 +1,77 @@ +/* + * 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 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 */ + +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 struct syscfg_reset_controller_data stih415_powerdown_controller = { + .wait_for_ack = true, + .nr_channels = ARRAY_SIZE(stih415_powerdowns), + .channels = stih415_powerdowns, +}; + +static struct of_device_id stih415_reset_match[] = { + { .compatible = "st,stih415-powerdown", + .data = &stih415_powerdown_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); |