From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/regulator/ti-abb-regulator.c | 875 +++++++++++++++++++++++++++++++++++ 1 file changed, 875 insertions(+) create mode 100644 drivers/regulator/ti-abb-regulator.c (limited to 'drivers/regulator/ti-abb-regulator.c') diff --git a/drivers/regulator/ti-abb-regulator.c b/drivers/regulator/ti-abb-regulator.c new file mode 100644 index 000000000..115345e9f --- /dev/null +++ b/drivers/regulator/ti-abb-regulator.c @@ -0,0 +1,875 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Texas Instruments SoC Adaptive Body Bias(ABB) Regulator + * + * Copyright (C) 2011 Texas Instruments, Inc. + * Mike Turquette + * + * Copyright (C) 2012-2013 Texas Instruments, Inc. + * Andrii Tseglytskyi + * Nishanth Menon + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * ABB LDO operating states: + * NOMINAL_OPP: bypasses the ABB LDO + * FAST_OPP: sets ABB LDO to Forward Body-Bias + * SLOW_OPP: sets ABB LDO to Reverse Body-Bias + */ +#define TI_ABB_NOMINAL_OPP 0 +#define TI_ABB_FAST_OPP 1 +#define TI_ABB_SLOW_OPP 3 + +/** + * struct ti_abb_info - ABB information per voltage setting + * @opp_sel: one of TI_ABB macro + * @vset: (optional) vset value that LDOVBB needs to be overridden with. + * + * Array of per voltage entries organized in the same order as regulator_desc's + * volt_table list. (selector is used to index from this array) + */ +struct ti_abb_info { + u32 opp_sel; + u32 vset; +}; + +/** + * struct ti_abb_reg - Register description for ABB block + * @setup_off: setup register offset from base + * @control_off: control register offset from base + * @sr2_wtcnt_value_mask: setup register- sr2_wtcnt_value mask + * @fbb_sel_mask: setup register- FBB sel mask + * @rbb_sel_mask: setup register- RBB sel mask + * @sr2_en_mask: setup register- enable mask + * @opp_change_mask: control register - mask to trigger LDOVBB change + * @opp_sel_mask: control register - mask for mode to operate + */ +struct ti_abb_reg { + u32 setup_off; + u32 control_off; + + /* Setup register fields */ + u32 sr2_wtcnt_value_mask; + u32 fbb_sel_mask; + u32 rbb_sel_mask; + u32 sr2_en_mask; + + /* Control register fields */ + u32 opp_change_mask; + u32 opp_sel_mask; +}; + +/** + * struct ti_abb - ABB instance data + * @rdesc: regulator descriptor + * @clk: clock(usually sysclk) supplying ABB block + * @base: base address of ABB block + * @setup_reg: setup register of ABB block + * @control_reg: control register of ABB block + * @int_base: interrupt register base address + * @efuse_base: (optional) efuse base address for ABB modes + * @ldo_base: (optional) LDOVBB vset override base address + * @regs: pointer to struct ti_abb_reg for ABB block + * @txdone_mask: mask on int_base for tranxdone interrupt + * @ldovbb_override_mask: mask to ldo_base for overriding default LDO VBB + * vset with value from efuse + * @ldovbb_vset_mask: mask to ldo_base for providing the VSET override + * @info: array to per voltage ABB configuration + * @current_info_idx: current index to info + * @settling_time: SoC specific settling time for LDO VBB + */ +struct ti_abb { + struct regulator_desc rdesc; + struct clk *clk; + void __iomem *base; + void __iomem *setup_reg; + void __iomem *control_reg; + void __iomem *int_base; + void __iomem *efuse_base; + void __iomem *ldo_base; + + const struct ti_abb_reg *regs; + u32 txdone_mask; + u32 ldovbb_override_mask; + u32 ldovbb_vset_mask; + + struct ti_abb_info *info; + int current_info_idx; + + u32 settling_time; +}; + +/** + * ti_abb_rmw() - handy wrapper to set specific register bits + * @mask: mask for register field + * @value: value shifted to mask location and written + * @reg: register address + * + * Return: final register value (may be unused) + */ +static inline u32 ti_abb_rmw(u32 mask, u32 value, void __iomem *reg) +{ + u32 val; + + val = readl(reg); + val &= ~mask; + val |= (value << __ffs(mask)) & mask; + writel(val, reg); + + return val; +} + +/** + * ti_abb_check_txdone() - handy wrapper to check ABB tranxdone status + * @abb: pointer to the abb instance + * + * Return: true or false + */ +static inline bool ti_abb_check_txdone(const struct ti_abb *abb) +{ + return !!(readl(abb->int_base) & abb->txdone_mask); +} + +/** + * ti_abb_clear_txdone() - handy wrapper to clear ABB tranxdone status + * @abb: pointer to the abb instance + */ +static inline void ti_abb_clear_txdone(const struct ti_abb *abb) +{ + writel(abb->txdone_mask, abb->int_base); +}; + +/** + * ti_abb_wait_txdone() - waits for ABB tranxdone event + * @dev: device + * @abb: pointer to the abb instance + * + * Return: 0 on success or -ETIMEDOUT if the event is not cleared on time. + */ +static int ti_abb_wait_txdone(struct device *dev, struct ti_abb *abb) +{ + int timeout = 0; + bool status; + + while (timeout++ <= abb->settling_time) { + status = ti_abb_check_txdone(abb); + if (status) + return 0; + + udelay(1); + } + + dev_warn_ratelimited(dev, "%s:TRANXDONE timeout(%duS) int=0x%08x\n", + __func__, timeout, readl(abb->int_base)); + return -ETIMEDOUT; +} + +/** + * ti_abb_clear_all_txdone() - clears ABB tranxdone event + * @dev: device + * @abb: pointer to the abb instance + * + * Return: 0 on success or -ETIMEDOUT if the event is not cleared on time. + */ +static int ti_abb_clear_all_txdone(struct device *dev, const struct ti_abb *abb) +{ + int timeout = 0; + bool status; + + while (timeout++ <= abb->settling_time) { + ti_abb_clear_txdone(abb); + + status = ti_abb_check_txdone(abb); + if (!status) + return 0; + + udelay(1); + } + + dev_warn_ratelimited(dev, "%s:TRANXDONE timeout(%duS) int=0x%08x\n", + __func__, timeout, readl(abb->int_base)); + return -ETIMEDOUT; +} + +/** + * ti_abb_program_ldovbb() - program LDOVBB register for override value + * @dev: device + * @abb: pointer to the abb instance + * @info: ABB info to program + */ +static void ti_abb_program_ldovbb(struct device *dev, const struct ti_abb *abb, + struct ti_abb_info *info) +{ + u32 val; + + val = readl(abb->ldo_base); + /* clear up previous values */ + val &= ~(abb->ldovbb_override_mask | abb->ldovbb_vset_mask); + + switch (info->opp_sel) { + case TI_ABB_SLOW_OPP: + case TI_ABB_FAST_OPP: + val |= abb->ldovbb_override_mask; + val |= info->vset << __ffs(abb->ldovbb_vset_mask); + break; + } + + writel(val, abb->ldo_base); +} + +/** + * ti_abb_set_opp() - Setup ABB and LDO VBB for required bias + * @rdev: regulator device + * @abb: pointer to the abb instance + * @info: ABB info to program + * + * Return: 0 on success or appropriate error value when fails + */ +static int ti_abb_set_opp(struct regulator_dev *rdev, struct ti_abb *abb, + struct ti_abb_info *info) +{ + const struct ti_abb_reg *regs = abb->regs; + struct device *dev = &rdev->dev; + int ret; + + ret = ti_abb_clear_all_txdone(dev, abb); + if (ret) + goto out; + + ti_abb_rmw(regs->fbb_sel_mask | regs->rbb_sel_mask, 0, abb->setup_reg); + + switch (info->opp_sel) { + case TI_ABB_SLOW_OPP: + ti_abb_rmw(regs->rbb_sel_mask, 1, abb->setup_reg); + break; + case TI_ABB_FAST_OPP: + ti_abb_rmw(regs->fbb_sel_mask, 1, abb->setup_reg); + break; + } + + /* program next state of ABB ldo */ + ti_abb_rmw(regs->opp_sel_mask, info->opp_sel, abb->control_reg); + + /* + * program LDO VBB vset override if needed for !bypass mode + * XXX: Do not switch sequence - for !bypass, LDO override reset *must* + * be performed *before* switch to bias mode else VBB glitches. + */ + if (abb->ldo_base && info->opp_sel != TI_ABB_NOMINAL_OPP) + ti_abb_program_ldovbb(dev, abb, info); + + /* Initiate ABB ldo change */ + ti_abb_rmw(regs->opp_change_mask, 1, abb->control_reg); + + /* Wait for ABB LDO to complete transition to new Bias setting */ + ret = ti_abb_wait_txdone(dev, abb); + if (ret) + goto out; + + ret = ti_abb_clear_all_txdone(dev, abb); + if (ret) + goto out; + + /* + * Reset LDO VBB vset override bypass mode + * XXX: Do not switch sequence - for bypass, LDO override reset *must* + * be performed *after* switch to bypass else VBB glitches. + */ + if (abb->ldo_base && info->opp_sel == TI_ABB_NOMINAL_OPP) + ti_abb_program_ldovbb(dev, abb, info); + +out: + return ret; +} + +/** + * ti_abb_set_voltage_sel() - regulator accessor function to set ABB LDO + * @rdev: regulator device + * @sel: selector to index into required ABB LDO settings (maps to + * regulator descriptor's volt_table) + * + * Return: 0 on success or appropriate error value when fails + */ +static int ti_abb_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) +{ + const struct regulator_desc *desc = rdev->desc; + struct ti_abb *abb = rdev_get_drvdata(rdev); + struct device *dev = &rdev->dev; + struct ti_abb_info *info, *oinfo; + int ret = 0; + + if (!abb) { + dev_err_ratelimited(dev, "%s: No regulator drvdata\n", + __func__); + return -ENODEV; + } + + if (!desc->n_voltages || !abb->info) { + dev_err_ratelimited(dev, + "%s: No valid voltage table entries?\n", + __func__); + return -EINVAL; + } + + if (sel >= desc->n_voltages) { + dev_err(dev, "%s: sel idx(%d) >= n_voltages(%d)\n", __func__, + sel, desc->n_voltages); + return -EINVAL; + } + + /* If we are in the same index as we were, nothing to do here! */ + if (sel == abb->current_info_idx) { + dev_dbg(dev, "%s: Already at sel=%d\n", __func__, sel); + return ret; + } + + info = &abb->info[sel]; + /* + * When Linux kernel is starting up, we aren't sure of the + * Bias configuration that bootloader has configured. + * So, we get to know the actual setting the first time + * we are asked to transition. + */ + if (abb->current_info_idx == -EINVAL) + goto just_set_abb; + + /* If data is exactly the same, then just update index, no change */ + oinfo = &abb->info[abb->current_info_idx]; + if (!memcmp(info, oinfo, sizeof(*info))) { + dev_dbg(dev, "%s: Same data new idx=%d, old idx=%d\n", __func__, + sel, abb->current_info_idx); + goto out; + } + +just_set_abb: + ret = ti_abb_set_opp(rdev, abb, info); + +out: + if (!ret) + abb->current_info_idx = sel; + else + dev_err_ratelimited(dev, + "%s: Volt[%d] idx[%d] mode[%d] Fail(%d)\n", + __func__, desc->volt_table[sel], sel, + info->opp_sel, ret); + return ret; +} + +/** + * ti_abb_get_voltage_sel() - Regulator accessor to get current ABB LDO setting + * @rdev: regulator device + * + * Return: 0 on success or appropriate error value when fails + */ +static int ti_abb_get_voltage_sel(struct regulator_dev *rdev) +{ + const struct regulator_desc *desc = rdev->desc; + struct ti_abb *abb = rdev_get_drvdata(rdev); + struct device *dev = &rdev->dev; + + if (!abb) { + dev_err_ratelimited(dev, "%s: No regulator drvdata\n", + __func__); + return -ENODEV; + } + + if (!desc->n_voltages || !abb->info) { + dev_err_ratelimited(dev, + "%s: No valid voltage table entries?\n", + __func__); + return -EINVAL; + } + + if (abb->current_info_idx >= (int)desc->n_voltages) { + dev_err(dev, "%s: Corrupted data? idx(%d) >= n_voltages(%d)\n", + __func__, abb->current_info_idx, desc->n_voltages); + return -EINVAL; + } + + return abb->current_info_idx; +} + +/** + * ti_abb_init_timings() - setup ABB clock timing for the current platform + * @dev: device + * @abb: pointer to the abb instance + * + * Return: 0 if timing is updated, else returns error result. + */ +static int ti_abb_init_timings(struct device *dev, struct ti_abb *abb) +{ + u32 clock_cycles; + u32 clk_rate, sr2_wt_cnt_val, cycle_rate; + const struct ti_abb_reg *regs = abb->regs; + int ret; + char *pname = "ti,settling-time"; + + /* read device tree properties */ + ret = of_property_read_u32(dev->of_node, pname, &abb->settling_time); + if (ret) { + dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret); + return ret; + } + + /* ABB LDO cannot be settle in 0 time */ + if (!abb->settling_time) { + dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); + return -EINVAL; + } + + pname = "ti,clock-cycles"; + ret = of_property_read_u32(dev->of_node, pname, &clock_cycles); + if (ret) { + dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret); + return ret; + } + /* ABB LDO cannot be settle in 0 clock cycles */ + if (!clock_cycles) { + dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); + return -EINVAL; + } + + abb->clk = devm_clk_get(dev, NULL); + if (IS_ERR(abb->clk)) { + ret = PTR_ERR(abb->clk); + dev_err(dev, "%s: Unable to get clk(%d)\n", __func__, ret); + return ret; + } + + /* + * SR2_WTCNT_VALUE is the settling time for the ABB ldo after a + * transition and must be programmed with the correct time at boot. + * The value programmed into the register is the number of SYS_CLK + * clock cycles that match a given wall time profiled for the ldo. + * This value depends on: + * settling time of ldo in micro-seconds (varies per OMAP family) + * # of clock cycles per SYS_CLK period (varies per OMAP family) + * the SYS_CLK frequency in MHz (varies per board) + * The formula is: + * + * ldo settling time (in micro-seconds) + * SR2_WTCNT_VALUE = ------------------------------------------ + * (# system clock cycles) * (sys_clk period) + * + * Put another way: + * + * SR2_WTCNT_VALUE = settling time / (# SYS_CLK cycles / SYS_CLK rate)) + * + * To avoid dividing by zero multiply both "# clock cycles" and + * "settling time" by 10 such that the final result is the one we want. + */ + + /* Convert SYS_CLK rate to MHz & prevent divide by zero */ + clk_rate = DIV_ROUND_CLOSEST(clk_get_rate(abb->clk), 1000000); + + /* Calculate cycle rate */ + cycle_rate = DIV_ROUND_CLOSEST(clock_cycles * 10, clk_rate); + + /* Calculate SR2_WTCNT_VALUE */ + sr2_wt_cnt_val = DIV_ROUND_CLOSEST(abb->settling_time * 10, cycle_rate); + + dev_dbg(dev, "%s: Clk_rate=%ld, sr2_cnt=0x%08x\n", __func__, + clk_get_rate(abb->clk), sr2_wt_cnt_val); + + ti_abb_rmw(regs->sr2_wtcnt_value_mask, sr2_wt_cnt_val, abb->setup_reg); + + return 0; +} + +/** + * ti_abb_init_table() - Initialize ABB table from device tree + * @dev: device + * @abb: pointer to the abb instance + * @rinit_data: regulator initdata + * + * Return: 0 on success or appropriate error value when fails + */ +static int ti_abb_init_table(struct device *dev, struct ti_abb *abb, + struct regulator_init_data *rinit_data) +{ + struct ti_abb_info *info; + const u32 num_values = 6; + char *pname = "ti,abb_info"; + u32 i; + unsigned int *volt_table; + int num_entries, min_uV = INT_MAX, max_uV = 0; + struct regulation_constraints *c = &rinit_data->constraints; + + /* + * Each abb_info is a set of n-tuple, where n is num_values, consisting + * of voltage and a set of detection logic for ABB information for that + * voltage to apply. + */ + num_entries = of_property_count_u32_elems(dev->of_node, pname); + if (num_entries < 0) { + dev_err(dev, "No '%s' property?\n", pname); + return num_entries; + } + + if (!num_entries || (num_entries % num_values)) { + dev_err(dev, "All '%s' list entries need %d vals\n", pname, + num_values); + return -EINVAL; + } + num_entries /= num_values; + + info = devm_kcalloc(dev, num_entries, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + abb->info = info; + + volt_table = devm_kcalloc(dev, num_entries, sizeof(unsigned int), + GFP_KERNEL); + if (!volt_table) + return -ENOMEM; + + abb->rdesc.n_voltages = num_entries; + abb->rdesc.volt_table = volt_table; + /* We do not know where the OPP voltage is at the moment */ + abb->current_info_idx = -EINVAL; + + for (i = 0; i < num_entries; i++, info++, volt_table++) { + u32 efuse_offset, rbb_mask, fbb_mask, vset_mask; + u32 efuse_val; + + /* NOTE: num_values should equal to entries picked up here */ + of_property_read_u32_index(dev->of_node, pname, i * num_values, + volt_table); + of_property_read_u32_index(dev->of_node, pname, + i * num_values + 1, &info->opp_sel); + of_property_read_u32_index(dev->of_node, pname, + i * num_values + 2, &efuse_offset); + of_property_read_u32_index(dev->of_node, pname, + i * num_values + 3, &rbb_mask); + of_property_read_u32_index(dev->of_node, pname, + i * num_values + 4, &fbb_mask); + of_property_read_u32_index(dev->of_node, pname, + i * num_values + 5, &vset_mask); + + dev_dbg(dev, + "[%d]v=%d ABB=%d ef=0x%x rbb=0x%x fbb=0x%x vset=0x%x\n", + i, *volt_table, info->opp_sel, efuse_offset, rbb_mask, + fbb_mask, vset_mask); + + /* Find min/max for voltage set */ + if (min_uV > *volt_table) + min_uV = *volt_table; + if (max_uV < *volt_table) + max_uV = *volt_table; + + if (!abb->efuse_base) { + /* Ignore invalid data, but warn to help cleanup */ + if (efuse_offset || rbb_mask || fbb_mask || vset_mask) + dev_err(dev, "prop '%s': v=%d,bad efuse/mask\n", + pname, *volt_table); + goto check_abb; + } + + efuse_val = readl(abb->efuse_base + efuse_offset); + + /* Use ABB recommendation from Efuse */ + if (efuse_val & rbb_mask) + info->opp_sel = TI_ABB_SLOW_OPP; + else if (efuse_val & fbb_mask) + info->opp_sel = TI_ABB_FAST_OPP; + else if (rbb_mask || fbb_mask) + info->opp_sel = TI_ABB_NOMINAL_OPP; + + dev_dbg(dev, + "[%d]v=%d efusev=0x%x final ABB=%d\n", + i, *volt_table, efuse_val, info->opp_sel); + + /* Use recommended Vset bits from Efuse */ + if (!abb->ldo_base) { + if (vset_mask) + dev_err(dev, "prop'%s':v=%d vst=%x LDO base?\n", + pname, *volt_table, vset_mask); + continue; + } + info->vset = (efuse_val & vset_mask) >> __ffs(vset_mask); + dev_dbg(dev, "[%d]v=%d vset=%x\n", i, *volt_table, info->vset); +check_abb: + switch (info->opp_sel) { + case TI_ABB_NOMINAL_OPP: + case TI_ABB_FAST_OPP: + case TI_ABB_SLOW_OPP: + /* Valid values */ + break; + default: + dev_err(dev, "%s:[%d]v=%d, ABB=%d is invalid! Abort!\n", + __func__, i, *volt_table, info->opp_sel); + return -EINVAL; + } + } + + /* Setup the min/max voltage constraints from the supported list */ + c->min_uV = min_uV; + c->max_uV = max_uV; + + return 0; +} + +static const struct regulator_ops ti_abb_reg_ops = { + .list_voltage = regulator_list_voltage_table, + + .set_voltage_sel = ti_abb_set_voltage_sel, + .get_voltage_sel = ti_abb_get_voltage_sel, +}; + +/* Default ABB block offsets, IF this changes in future, create new one */ +static const struct ti_abb_reg abb_regs_v1 = { + /* WARNING: registers are wrongly documented in TRM */ + .setup_off = 0x04, + .control_off = 0x00, + + .sr2_wtcnt_value_mask = (0xff << 8), + .fbb_sel_mask = (0x01 << 2), + .rbb_sel_mask = (0x01 << 1), + .sr2_en_mask = (0x01 << 0), + + .opp_change_mask = (0x01 << 2), + .opp_sel_mask = (0x03 << 0), +}; + +static const struct ti_abb_reg abb_regs_v2 = { + .setup_off = 0x00, + .control_off = 0x04, + + .sr2_wtcnt_value_mask = (0xff << 8), + .fbb_sel_mask = (0x01 << 2), + .rbb_sel_mask = (0x01 << 1), + .sr2_en_mask = (0x01 << 0), + + .opp_change_mask = (0x01 << 2), + .opp_sel_mask = (0x03 << 0), +}; + +static const struct ti_abb_reg abb_regs_generic = { + .sr2_wtcnt_value_mask = (0xff << 8), + .fbb_sel_mask = (0x01 << 2), + .rbb_sel_mask = (0x01 << 1), + .sr2_en_mask = (0x01 << 0), + + .opp_change_mask = (0x01 << 2), + .opp_sel_mask = (0x03 << 0), +}; + +static const struct of_device_id ti_abb_of_match[] = { + {.compatible = "ti,abb-v1", .data = &abb_regs_v1}, + {.compatible = "ti,abb-v2", .data = &abb_regs_v2}, + {.compatible = "ti,abb-v3", .data = &abb_regs_generic}, + { }, +}; + +MODULE_DEVICE_TABLE(of, ti_abb_of_match); + +/** + * ti_abb_probe() - Initialize an ABB ldo instance + * @pdev: ABB platform device + * + * Initializes an individual ABB LDO for required Body-Bias. ABB is used to + * additional bias supply to SoC modules for power savings or mandatory stability + * configuration at certain Operating Performance Points(OPPs). + * + * Return: 0 on success or appropriate error value when fails + */ +static int ti_abb_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct of_device_id *match; + struct resource *res; + struct ti_abb *abb; + struct regulator_init_data *initdata = NULL; + struct regulator_dev *rdev = NULL; + struct regulator_desc *desc; + struct regulation_constraints *c; + struct regulator_config config = { }; + char *pname; + int ret = 0; + + match = of_match_device(ti_abb_of_match, dev); + if (!match) { + /* We do not expect this to happen */ + dev_err(dev, "%s: Unable to match device\n", __func__); + return -ENODEV; + } + if (!match->data) { + dev_err(dev, "%s: Bad data in match\n", __func__); + return -EINVAL; + } + + abb = devm_kzalloc(dev, sizeof(struct ti_abb), GFP_KERNEL); + if (!abb) + return -ENOMEM; + abb->regs = match->data; + + /* Map ABB resources */ + if (abb->regs->setup_off || abb->regs->control_off) { + abb->base = devm_platform_ioremap_resource_byname(pdev, "base-address"); + if (IS_ERR(abb->base)) + return PTR_ERR(abb->base); + + abb->setup_reg = abb->base + abb->regs->setup_off; + abb->control_reg = abb->base + abb->regs->control_off; + + } else { + abb->control_reg = devm_platform_ioremap_resource_byname(pdev, "control-address"); + if (IS_ERR(abb->control_reg)) + return PTR_ERR(abb->control_reg); + + abb->setup_reg = devm_platform_ioremap_resource_byname(pdev, "setup-address"); + if (IS_ERR(abb->setup_reg)) + return PTR_ERR(abb->setup_reg); + } + + abb->int_base = devm_platform_ioremap_resource_byname(pdev, "int-address"); + if (IS_ERR(abb->int_base)) + return PTR_ERR(abb->int_base); + + /* Map Optional resources */ + pname = "efuse-address"; + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname); + if (!res) { + dev_dbg(dev, "Missing '%s' IO resource\n", pname); + ret = -ENODEV; + goto skip_opt; + } + + /* + * We may have shared efuse register offsets which are read-only + * between domains + */ + abb->efuse_base = devm_ioremap(dev, res->start, + resource_size(res)); + if (!abb->efuse_base) { + dev_err(dev, "Unable to map '%s'\n", pname); + return -ENOMEM; + } + + pname = "ldo-address"; + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname); + if (!res) { + dev_dbg(dev, "Missing '%s' IO resource\n", pname); + ret = -ENODEV; + goto skip_opt; + } + abb->ldo_base = devm_ioremap_resource(dev, res); + if (IS_ERR(abb->ldo_base)) + return PTR_ERR(abb->ldo_base); + + /* IF ldo_base is set, the following are mandatory */ + pname = "ti,ldovbb-override-mask"; + ret = + of_property_read_u32(pdev->dev.of_node, pname, + &abb->ldovbb_override_mask); + if (ret) { + dev_err(dev, "Missing '%s' (%d)\n", pname, ret); + return ret; + } + if (!abb->ldovbb_override_mask) { + dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); + return -EINVAL; + } + + pname = "ti,ldovbb-vset-mask"; + ret = + of_property_read_u32(pdev->dev.of_node, pname, + &abb->ldovbb_vset_mask); + if (ret) { + dev_err(dev, "Missing '%s' (%d)\n", pname, ret); + return ret; + } + if (!abb->ldovbb_vset_mask) { + dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); + return -EINVAL; + } + +skip_opt: + pname = "ti,tranxdone-status-mask"; + ret = + of_property_read_u32(pdev->dev.of_node, pname, + &abb->txdone_mask); + if (ret) { + dev_err(dev, "Missing '%s' (%d)\n", pname, ret); + return ret; + } + if (!abb->txdone_mask) { + dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); + return -EINVAL; + } + + initdata = of_get_regulator_init_data(dev, pdev->dev.of_node, + &abb->rdesc); + if (!initdata) { + dev_err(dev, "%s: Unable to alloc regulator init data\n", + __func__); + return -ENOMEM; + } + + /* init ABB opp_sel table */ + ret = ti_abb_init_table(dev, abb, initdata); + if (ret) + return ret; + + /* init ABB timing */ + ret = ti_abb_init_timings(dev, abb); + if (ret) + return ret; + + desc = &abb->rdesc; + desc->name = dev_name(dev); + desc->owner = THIS_MODULE; + desc->type = REGULATOR_VOLTAGE; + desc->ops = &ti_abb_reg_ops; + + c = &initdata->constraints; + if (desc->n_voltages > 1) + c->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; + c->always_on = true; + + config.dev = dev; + config.init_data = initdata; + config.driver_data = abb; + config.of_node = pdev->dev.of_node; + + rdev = devm_regulator_register(dev, desc, &config); + if (IS_ERR(rdev)) { + ret = PTR_ERR(rdev); + dev_err(dev, "%s: failed to register regulator(%d)\n", + __func__, ret); + return ret; + } + platform_set_drvdata(pdev, rdev); + + /* Enable the ldo if not already done by bootloader */ + ti_abb_rmw(abb->regs->sr2_en_mask, 1, abb->setup_reg); + + return 0; +} + +MODULE_ALIAS("platform:ti_abb"); + +static struct platform_driver ti_abb_driver = { + .probe = ti_abb_probe, + .driver = { + .name = "ti_abb", + .of_match_table = of_match_ptr(ti_abb_of_match), + }, +}; +module_platform_driver(ti_abb_driver); + +MODULE_DESCRIPTION("Texas Instruments ABB LDO regulator driver"); +MODULE_AUTHOR("Texas Instruments Inc."); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3