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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/cpufreq/brcmstb-avs-cpufreq.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
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(). ...
Diffstat (limited to 'drivers/cpufreq/brcmstb-avs-cpufreq.c')
-rw-r--r--drivers/cpufreq/brcmstb-avs-cpufreq.c779
1 files changed, 779 insertions, 0 deletions
diff --git a/drivers/cpufreq/brcmstb-avs-cpufreq.c b/drivers/cpufreq/brcmstb-avs-cpufreq.c
new file mode 100644
index 000000000..ffea64021
--- /dev/null
+++ b/drivers/cpufreq/brcmstb-avs-cpufreq.c
@@ -0,0 +1,779 @@
+/*
+ * CPU frequency scaling for Broadcom SoCs with AVS firmware that
+ * supports DVS or DVFS
+ *
+ * Copyright (c) 2016 Broadcom
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * "AVS" is the name of a firmware developed at Broadcom. It derives
+ * its name from the technique called "Adaptive Voltage Scaling".
+ * Adaptive voltage scaling was the original purpose of this firmware.
+ * The AVS firmware still supports "AVS mode", where all it does is
+ * adaptive voltage scaling. However, on some newer Broadcom SoCs, the
+ * AVS Firmware, despite its unchanged name, also supports DFS mode and
+ * DVFS mode.
+ *
+ * In the context of this document and the related driver, "AVS" by
+ * itself always means the Broadcom firmware and never refers to the
+ * technique called "Adaptive Voltage Scaling".
+ *
+ * The Broadcom STB AVS CPUfreq driver provides voltage and frequency
+ * scaling on Broadcom SoCs using AVS firmware with support for DFS and
+ * DVFS. The AVS firmware is running on its own co-processor. The
+ * driver supports both uniprocessor (UP) and symmetric multiprocessor
+ * (SMP) systems which share clock and voltage across all CPUs.
+ *
+ * Actual voltage and frequency scaling is done solely by the AVS
+ * firmware. This driver does not change frequency or voltage itself.
+ * It provides a standard CPUfreq interface to the rest of the kernel
+ * and to userland. It interfaces with the AVS firmware to effect the
+ * requested changes and to report back the current system status in a
+ * way that is expected by existing tools.
+ */
+
+#include <linux/cpufreq.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/semaphore.h>
+
+/* Max number of arguments AVS calls take */
+#define AVS_MAX_CMD_ARGS 4
+/*
+ * This macro is used to generate AVS parameter register offsets. For
+ * x >= AVS_MAX_CMD_ARGS, it returns 0 to protect against accidental memory
+ * access outside of the parameter range. (Offset 0 is the first parameter.)
+ */
+#define AVS_PARAM_MULT(x) ((x) < AVS_MAX_CMD_ARGS ? (x) : 0)
+
+/* AVS Mailbox Register offsets */
+#define AVS_MBOX_COMMAND 0x00
+#define AVS_MBOX_STATUS 0x04
+#define AVS_MBOX_VOLTAGE0 0x08
+#define AVS_MBOX_TEMP0 0x0c
+#define AVS_MBOX_PV0 0x10
+#define AVS_MBOX_MV0 0x14
+#define AVS_MBOX_PARAM(x) (0x18 + AVS_PARAM_MULT(x) * sizeof(u32))
+#define AVS_MBOX_REVISION 0x28
+#define AVS_MBOX_PSTATE 0x2c
+#define AVS_MBOX_HEARTBEAT 0x30
+#define AVS_MBOX_MAGIC 0x34
+#define AVS_MBOX_SIGMA_HVT 0x38
+#define AVS_MBOX_SIGMA_SVT 0x3c
+#define AVS_MBOX_VOLTAGE1 0x40
+#define AVS_MBOX_TEMP1 0x44
+#define AVS_MBOX_PV1 0x48
+#define AVS_MBOX_MV1 0x4c
+#define AVS_MBOX_FREQUENCY 0x50
+
+/* AVS Commands */
+#define AVS_CMD_AVAILABLE 0x00
+#define AVS_CMD_DISABLE 0x10
+#define AVS_CMD_ENABLE 0x11
+#define AVS_CMD_S2_ENTER 0x12
+#define AVS_CMD_S2_EXIT 0x13
+#define AVS_CMD_BBM_ENTER 0x14
+#define AVS_CMD_BBM_EXIT 0x15
+#define AVS_CMD_S3_ENTER 0x16
+#define AVS_CMD_S3_EXIT 0x17
+#define AVS_CMD_BALANCE 0x18
+/* PMAP and P-STATE commands */
+#define AVS_CMD_GET_PMAP 0x30
+#define AVS_CMD_SET_PMAP 0x31
+#define AVS_CMD_GET_PSTATE 0x40
+#define AVS_CMD_SET_PSTATE 0x41
+
+/* Different modes AVS supports (for GET_PMAP/SET_PMAP) */
+#define AVS_MODE_AVS 0x0
+#define AVS_MODE_DFS 0x1
+#define AVS_MODE_DVS 0x2
+#define AVS_MODE_DVFS 0x3
+
+/*
+ * PMAP parameter p1
+ * unused:31-24, mdiv_p0:23-16, unused:15-14, pdiv:13-10 , ndiv_int:9-0
+ */
+#define NDIV_INT_SHIFT 0
+#define NDIV_INT_MASK 0x3ff
+#define PDIV_SHIFT 10
+#define PDIV_MASK 0xf
+#define MDIV_P0_SHIFT 16
+#define MDIV_P0_MASK 0xff
+/*
+ * PMAP parameter p2
+ * mdiv_p4:31-24, mdiv_p3:23-16, mdiv_p2:15:8, mdiv_p1:7:0
+ */
+#define MDIV_P1_SHIFT 0
+#define MDIV_P1_MASK 0xff
+#define MDIV_P2_SHIFT 8
+#define MDIV_P2_MASK 0xff
+#define MDIV_P3_SHIFT 16
+#define MDIV_P3_MASK 0xff
+#define MDIV_P4_SHIFT 24
+#define MDIV_P4_MASK 0xff
+
+/* Different P-STATES AVS supports (for GET_PSTATE/SET_PSTATE) */
+#define AVS_PSTATE_P0 0x0
+#define AVS_PSTATE_P1 0x1
+#define AVS_PSTATE_P2 0x2
+#define AVS_PSTATE_P3 0x3
+#define AVS_PSTATE_P4 0x4
+#define AVS_PSTATE_MAX AVS_PSTATE_P4
+
+/* CPU L2 Interrupt Controller Registers */
+#define AVS_CPU_L2_SET0 0x04
+#define AVS_CPU_L2_INT_MASK BIT(31)
+
+/* AVS Command Status Values */
+#define AVS_STATUS_CLEAR 0x00
+/* Command/notification accepted */
+#define AVS_STATUS_SUCCESS 0xf0
+/* Command/notification rejected */
+#define AVS_STATUS_FAILURE 0xff
+/* Invalid command/notification (unknown) */
+#define AVS_STATUS_INVALID 0xf1
+/* Non-AVS modes are not supported */
+#define AVS_STATUS_NO_SUPP 0xf2
+/* Cannot set P-State until P-Map supplied */
+#define AVS_STATUS_NO_MAP 0xf3
+/* Cannot change P-Map after initial P-Map set */
+#define AVS_STATUS_MAP_SET 0xf4
+/* Max AVS status; higher numbers are used for debugging */
+#define AVS_STATUS_MAX 0xff
+
+/* Other AVS related constants */
+#define AVS_LOOP_LIMIT 10000
+#define AVS_TIMEOUT 300 /* in ms; expected completion is < 10ms */
+#define AVS_FIRMWARE_MAGIC 0xa11600d1
+
+#define BRCM_AVS_CPUFREQ_PREFIX "brcmstb-avs"
+#define BRCM_AVS_CPUFREQ_NAME BRCM_AVS_CPUFREQ_PREFIX "-cpufreq"
+#define BRCM_AVS_CPU_DATA "brcm,avs-cpu-data-mem"
+#define BRCM_AVS_CPU_INTR "brcm,avs-cpu-l2-intr"
+#define BRCM_AVS_HOST_INTR "sw_intr"
+
+struct pmap {
+ unsigned int mode;
+ unsigned int p1;
+ unsigned int p2;
+ unsigned int state;
+};
+
+struct private_data {
+ void __iomem *base;
+ void __iomem *avs_intr_base;
+ struct device *dev;
+ struct completion done;
+ struct semaphore sem;
+ struct pmap pmap;
+ int host_irq;
+};
+
+static void __iomem *__map_region(const char *name)
+{
+ struct device_node *np;
+ void __iomem *ptr;
+
+ np = of_find_compatible_node(NULL, NULL, name);
+ if (!np)
+ return NULL;
+
+ ptr = of_iomap(np, 0);
+ of_node_put(np);
+
+ return ptr;
+}
+
+static unsigned long wait_for_avs_command(struct private_data *priv,
+ unsigned long timeout)
+{
+ unsigned long time_left = 0;
+ u32 val;
+
+ /* Event driven, wait for the command interrupt */
+ if (priv->host_irq >= 0)
+ return wait_for_completion_timeout(&priv->done,
+ msecs_to_jiffies(timeout));
+
+ /* Polling for command completion */
+ do {
+ time_left = timeout;
+ val = readl(priv->base + AVS_MBOX_STATUS);
+ if (val)
+ break;
+
+ usleep_range(1000, 2000);
+ } while (--timeout);
+
+ return time_left;
+}
+
+static int __issue_avs_command(struct private_data *priv, unsigned int cmd,
+ unsigned int num_in, unsigned int num_out,
+ u32 args[])
+{
+ void __iomem *base = priv->base;
+ unsigned long time_left;
+ unsigned int i;
+ int ret;
+ u32 val;
+
+ ret = down_interruptible(&priv->sem);
+ if (ret)
+ return ret;
+
+ /*
+ * Make sure no other command is currently running: cmd is 0 if AVS
+ * co-processor is idle. Due to the guard above, we should almost never
+ * have to wait here.
+ */
+ for (i = 0, val = 1; val != 0 && i < AVS_LOOP_LIMIT; i++)
+ val = readl(base + AVS_MBOX_COMMAND);
+
+ /* Give the caller a chance to retry if AVS is busy. */
+ if (i == AVS_LOOP_LIMIT) {
+ ret = -EAGAIN;
+ goto out;
+ }
+
+ /* Clear status before we begin. */
+ writel(AVS_STATUS_CLEAR, base + AVS_MBOX_STATUS);
+
+ /* Provide input parameters */
+ for (i = 0; i < num_in; i++)
+ writel(args[i], base + AVS_MBOX_PARAM(i));
+
+ /* Protect from spurious interrupts. */
+ reinit_completion(&priv->done);
+
+ /* Now issue the command & tell firmware to wake up to process it. */
+ writel(cmd, base + AVS_MBOX_COMMAND);
+ writel(AVS_CPU_L2_INT_MASK, priv->avs_intr_base + AVS_CPU_L2_SET0);
+
+ /* Wait for AVS co-processor to finish processing the command. */
+ time_left = wait_for_avs_command(priv, AVS_TIMEOUT);
+
+ /*
+ * If the AVS status is not in the expected range, it means AVS didn't
+ * complete our command in time, and we return an error. Also, if there
+ * is no "time left", we timed out waiting for the interrupt.
+ */
+ val = readl(base + AVS_MBOX_STATUS);
+ if (time_left == 0 || val == 0 || val > AVS_STATUS_MAX) {
+ dev_err(priv->dev, "AVS command %#x didn't complete in time\n",
+ cmd);
+ dev_err(priv->dev, " Time left: %u ms, AVS status: %#x\n",
+ jiffies_to_msecs(time_left), val);
+ ret = -ETIMEDOUT;
+ goto out;
+ }
+
+ /* Process returned values */
+ for (i = 0; i < num_out; i++)
+ args[i] = readl(base + AVS_MBOX_PARAM(i));
+
+ /* Clear status to tell AVS co-processor we are done. */
+ writel(AVS_STATUS_CLEAR, base + AVS_MBOX_STATUS);
+
+ /* Convert firmware errors to errno's as much as possible. */
+ switch (val) {
+ case AVS_STATUS_INVALID:
+ ret = -EINVAL;
+ break;
+ case AVS_STATUS_NO_SUPP:
+ ret = -ENOTSUPP;
+ break;
+ case AVS_STATUS_NO_MAP:
+ ret = -ENOENT;
+ break;
+ case AVS_STATUS_MAP_SET:
+ ret = -EEXIST;
+ break;
+ case AVS_STATUS_FAILURE:
+ ret = -EIO;
+ break;
+ }
+
+out:
+ up(&priv->sem);
+
+ return ret;
+}
+
+static irqreturn_t irq_handler(int irq, void *data)
+{
+ struct private_data *priv = data;
+
+ /* AVS command completed execution. Wake up __issue_avs_command(). */
+ complete(&priv->done);
+
+ return IRQ_HANDLED;
+}
+
+static char *brcm_avs_mode_to_string(unsigned int mode)
+{
+ switch (mode) {
+ case AVS_MODE_AVS:
+ return "AVS";
+ case AVS_MODE_DFS:
+ return "DFS";
+ case AVS_MODE_DVS:
+ return "DVS";
+ case AVS_MODE_DVFS:
+ return "DVFS";
+ }
+ return NULL;
+}
+
+static void brcm_avs_parse_p1(u32 p1, unsigned int *mdiv_p0, unsigned int *pdiv,
+ unsigned int *ndiv)
+{
+ *mdiv_p0 = (p1 >> MDIV_P0_SHIFT) & MDIV_P0_MASK;
+ *pdiv = (p1 >> PDIV_SHIFT) & PDIV_MASK;
+ *ndiv = (p1 >> NDIV_INT_SHIFT) & NDIV_INT_MASK;
+}
+
+static void brcm_avs_parse_p2(u32 p2, unsigned int *mdiv_p1,
+ unsigned int *mdiv_p2, unsigned int *mdiv_p3,
+ unsigned int *mdiv_p4)
+{
+ *mdiv_p4 = (p2 >> MDIV_P4_SHIFT) & MDIV_P4_MASK;
+ *mdiv_p3 = (p2 >> MDIV_P3_SHIFT) & MDIV_P3_MASK;
+ *mdiv_p2 = (p2 >> MDIV_P2_SHIFT) & MDIV_P2_MASK;
+ *mdiv_p1 = (p2 >> MDIV_P1_SHIFT) & MDIV_P1_MASK;
+}
+
+static int brcm_avs_get_pmap(struct private_data *priv, struct pmap *pmap)
+{
+ u32 args[AVS_MAX_CMD_ARGS];
+ int ret;
+
+ ret = __issue_avs_command(priv, AVS_CMD_GET_PMAP, 0, 4, args);
+ if (ret || !pmap)
+ return ret;
+
+ pmap->mode = args[0];
+ pmap->p1 = args[1];
+ pmap->p2 = args[2];
+ pmap->state = args[3];
+
+ return 0;
+}
+
+static int brcm_avs_set_pmap(struct private_data *priv, struct pmap *pmap)
+{
+ u32 args[AVS_MAX_CMD_ARGS];
+
+ args[0] = pmap->mode;
+ args[1] = pmap->p1;
+ args[2] = pmap->p2;
+ args[3] = pmap->state;
+
+ return __issue_avs_command(priv, AVS_CMD_SET_PMAP, 4, 0, args);
+}
+
+static int brcm_avs_get_pstate(struct private_data *priv, unsigned int *pstate)
+{
+ u32 args[AVS_MAX_CMD_ARGS];
+ int ret;
+
+ ret = __issue_avs_command(priv, AVS_CMD_GET_PSTATE, 0, 1, args);
+ if (ret)
+ return ret;
+ *pstate = args[0];
+
+ return 0;
+}
+
+static int brcm_avs_set_pstate(struct private_data *priv, unsigned int pstate)
+{
+ u32 args[AVS_MAX_CMD_ARGS];
+
+ args[0] = pstate;
+
+ return __issue_avs_command(priv, AVS_CMD_SET_PSTATE, 1, 0, args);
+
+}
+
+static u32 brcm_avs_get_voltage(void __iomem *base)
+{
+ return readl(base + AVS_MBOX_VOLTAGE1);
+}
+
+static u32 brcm_avs_get_frequency(void __iomem *base)
+{
+ return readl(base + AVS_MBOX_FREQUENCY) * 1000; /* in kHz */
+}
+
+/*
+ * We determine which frequencies are supported by cycling through all P-states
+ * and reading back what frequency we are running at for each P-state.
+ */
+static struct cpufreq_frequency_table *
+brcm_avs_get_freq_table(struct device *dev, struct private_data *priv)
+{
+ struct cpufreq_frequency_table *table;
+ unsigned int pstate;
+ int i, ret;
+
+ /* Remember P-state for later */
+ ret = brcm_avs_get_pstate(priv, &pstate);
+ if (ret)
+ return ERR_PTR(ret);
+
+ table = devm_kcalloc(dev, AVS_PSTATE_MAX + 1, sizeof(*table),
+ GFP_KERNEL);
+ if (!table)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = AVS_PSTATE_P0; i <= AVS_PSTATE_MAX; i++) {
+ ret = brcm_avs_set_pstate(priv, i);
+ if (ret)
+ return ERR_PTR(ret);
+ table[i].frequency = brcm_avs_get_frequency(priv->base);
+ table[i].driver_data = i;
+ }
+ table[i].frequency = CPUFREQ_TABLE_END;
+
+ /* Restore P-state */
+ ret = brcm_avs_set_pstate(priv, pstate);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return table;
+}
+
+/*
+ * To ensure the right firmware is running we need to
+ * - check the MAGIC matches what we expect
+ * - brcm_avs_get_pmap() doesn't return -ENOTSUPP or -EINVAL
+ * We need to set up our interrupt handling before calling brcm_avs_get_pmap()!
+ */
+static bool brcm_avs_is_firmware_loaded(struct private_data *priv)
+{
+ u32 magic;
+ int rc;
+
+ rc = brcm_avs_get_pmap(priv, NULL);
+ magic = readl(priv->base + AVS_MBOX_MAGIC);
+
+ return (magic == AVS_FIRMWARE_MAGIC) && ((rc != -ENOTSUPP) ||
+ (rc != -EINVAL));
+}
+
+static unsigned int brcm_avs_cpufreq_get(unsigned int cpu)
+{
+ struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+ struct private_data *priv = policy->driver_data;
+
+ cpufreq_cpu_put(policy);
+
+ return brcm_avs_get_frequency(priv->base);
+}
+
+static int brcm_avs_target_index(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ return brcm_avs_set_pstate(policy->driver_data,
+ policy->freq_table[index].driver_data);
+}
+
+static int brcm_avs_suspend(struct cpufreq_policy *policy)
+{
+ struct private_data *priv = policy->driver_data;
+ int ret;
+
+ ret = brcm_avs_get_pmap(priv, &priv->pmap);
+ if (ret)
+ return ret;
+
+ /*
+ * We can't use the P-state returned by brcm_avs_get_pmap(), since
+ * that's the initial P-state from when the P-map was downloaded to the
+ * AVS co-processor, not necessarily the P-state we are running at now.
+ * So, we get the current P-state explicitly.
+ */
+ ret = brcm_avs_get_pstate(priv, &priv->pmap.state);
+ if (ret)
+ return ret;
+
+ /* This is best effort. Nothing to do if it fails. */
+ (void)__issue_avs_command(priv, AVS_CMD_S2_ENTER, 0, 0, NULL);
+
+ return 0;
+}
+
+static int brcm_avs_resume(struct cpufreq_policy *policy)
+{
+ struct private_data *priv = policy->driver_data;
+ int ret;
+
+ /* This is best effort. Nothing to do if it fails. */
+ (void)__issue_avs_command(priv, AVS_CMD_S2_EXIT, 0, 0, NULL);
+
+ ret = brcm_avs_set_pmap(priv, &priv->pmap);
+ if (ret == -EEXIST) {
+ struct platform_device *pdev = cpufreq_get_driver_data();
+ struct device *dev = &pdev->dev;
+
+ dev_warn(dev, "PMAP was already set\n");
+ ret = 0;
+ }
+
+ return ret;
+}
+
+/*
+ * All initialization code that we only want to execute once goes here. Setup
+ * code that can be re-tried on every core (if it failed before) can go into
+ * brcm_avs_cpufreq_init().
+ */
+static int brcm_avs_prepare_init(struct platform_device *pdev)
+{
+ struct private_data *priv;
+ struct device *dev;
+ int ret;
+
+ dev = &pdev->dev;
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+ sema_init(&priv->sem, 1);
+ init_completion(&priv->done);
+ platform_set_drvdata(pdev, priv);
+
+ priv->base = __map_region(BRCM_AVS_CPU_DATA);
+ if (!priv->base) {
+ dev_err(dev, "Couldn't find property %s in device tree.\n",
+ BRCM_AVS_CPU_DATA);
+ return -ENOENT;
+ }
+
+ priv->avs_intr_base = __map_region(BRCM_AVS_CPU_INTR);
+ if (!priv->avs_intr_base) {
+ dev_err(dev, "Couldn't find property %s in device tree.\n",
+ BRCM_AVS_CPU_INTR);
+ ret = -ENOENT;
+ goto unmap_base;
+ }
+
+ priv->host_irq = platform_get_irq_byname(pdev, BRCM_AVS_HOST_INTR);
+
+ ret = devm_request_irq(dev, priv->host_irq, irq_handler,
+ IRQF_TRIGGER_RISING,
+ BRCM_AVS_HOST_INTR, priv);
+ if (ret && priv->host_irq >= 0) {
+ dev_err(dev, "IRQ request failed: %s (%d) -- %d\n",
+ BRCM_AVS_HOST_INTR, priv->host_irq, ret);
+ goto unmap_intr_base;
+ }
+
+ if (brcm_avs_is_firmware_loaded(priv))
+ return 0;
+
+ dev_err(dev, "AVS firmware is not loaded or doesn't support DVFS\n");
+ ret = -ENODEV;
+
+unmap_intr_base:
+ iounmap(priv->avs_intr_base);
+unmap_base:
+ iounmap(priv->base);
+
+ return ret;
+}
+
+static void brcm_avs_prepare_uninit(struct platform_device *pdev)
+{
+ struct private_data *priv;
+
+ priv = platform_get_drvdata(pdev);
+
+ iounmap(priv->avs_intr_base);
+ iounmap(priv->base);
+}
+
+static int brcm_avs_cpufreq_init(struct cpufreq_policy *policy)
+{
+ struct cpufreq_frequency_table *freq_table;
+ struct platform_device *pdev;
+ struct private_data *priv;
+ struct device *dev;
+ int ret;
+
+ pdev = cpufreq_get_driver_data();
+ priv = platform_get_drvdata(pdev);
+ policy->driver_data = priv;
+ dev = &pdev->dev;
+
+ freq_table = brcm_avs_get_freq_table(dev, priv);
+ if (IS_ERR(freq_table)) {
+ ret = PTR_ERR(freq_table);
+ dev_err(dev, "Couldn't determine frequency table (%d).\n", ret);
+ return ret;
+ }
+
+ policy->freq_table = freq_table;
+
+ /* All cores share the same clock and thus the same policy. */
+ cpumask_setall(policy->cpus);
+
+ ret = __issue_avs_command(priv, AVS_CMD_ENABLE, 0, 0, NULL);
+ if (!ret) {
+ unsigned int pstate;
+
+ ret = brcm_avs_get_pstate(priv, &pstate);
+ if (!ret) {
+ policy->cur = freq_table[pstate].frequency;
+ dev_info(dev, "registered\n");
+ return 0;
+ }
+ }
+
+ dev_err(dev, "couldn't initialize driver (%d)\n", ret);
+
+ return ret;
+}
+
+static ssize_t show_brcm_avs_pstate(struct cpufreq_policy *policy, char *buf)
+{
+ struct private_data *priv = policy->driver_data;
+ unsigned int pstate;
+
+ if (brcm_avs_get_pstate(priv, &pstate))
+ return sprintf(buf, "<unknown>\n");
+
+ return sprintf(buf, "%u\n", pstate);
+}
+
+static ssize_t show_brcm_avs_mode(struct cpufreq_policy *policy, char *buf)
+{
+ struct private_data *priv = policy->driver_data;
+ struct pmap pmap;
+
+ if (brcm_avs_get_pmap(priv, &pmap))
+ return sprintf(buf, "<unknown>\n");
+
+ return sprintf(buf, "%s %u\n", brcm_avs_mode_to_string(pmap.mode),
+ pmap.mode);
+}
+
+static ssize_t show_brcm_avs_pmap(struct cpufreq_policy *policy, char *buf)
+{
+ unsigned int mdiv_p0, mdiv_p1, mdiv_p2, mdiv_p3, mdiv_p4;
+ struct private_data *priv = policy->driver_data;
+ unsigned int ndiv, pdiv;
+ struct pmap pmap;
+
+ if (brcm_avs_get_pmap(priv, &pmap))
+ return sprintf(buf, "<unknown>\n");
+
+ brcm_avs_parse_p1(pmap.p1, &mdiv_p0, &pdiv, &ndiv);
+ brcm_avs_parse_p2(pmap.p2, &mdiv_p1, &mdiv_p2, &mdiv_p3, &mdiv_p4);
+
+ return sprintf(buf, "0x%08x 0x%08x %u %u %u %u %u %u %u %u %u\n",
+ pmap.p1, pmap.p2, ndiv, pdiv, mdiv_p0, mdiv_p1, mdiv_p2,
+ mdiv_p3, mdiv_p4, pmap.mode, pmap.state);
+}
+
+static ssize_t show_brcm_avs_voltage(struct cpufreq_policy *policy, char *buf)
+{
+ struct private_data *priv = policy->driver_data;
+
+ return sprintf(buf, "0x%08x\n", brcm_avs_get_voltage(priv->base));
+}
+
+static ssize_t show_brcm_avs_frequency(struct cpufreq_policy *policy, char *buf)
+{
+ struct private_data *priv = policy->driver_data;
+
+ return sprintf(buf, "0x%08x\n", brcm_avs_get_frequency(priv->base));
+}
+
+cpufreq_freq_attr_ro(brcm_avs_pstate);
+cpufreq_freq_attr_ro(brcm_avs_mode);
+cpufreq_freq_attr_ro(brcm_avs_pmap);
+cpufreq_freq_attr_ro(brcm_avs_voltage);
+cpufreq_freq_attr_ro(brcm_avs_frequency);
+
+static struct freq_attr *brcm_avs_cpufreq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ &brcm_avs_pstate,
+ &brcm_avs_mode,
+ &brcm_avs_pmap,
+ &brcm_avs_voltage,
+ &brcm_avs_frequency,
+ NULL
+};
+
+static struct cpufreq_driver brcm_avs_driver = {
+ .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
+ .verify = cpufreq_generic_frequency_table_verify,
+ .target_index = brcm_avs_target_index,
+ .get = brcm_avs_cpufreq_get,
+ .suspend = brcm_avs_suspend,
+ .resume = brcm_avs_resume,
+ .init = brcm_avs_cpufreq_init,
+ .attr = brcm_avs_cpufreq_attr,
+ .name = BRCM_AVS_CPUFREQ_PREFIX,
+};
+
+static int brcm_avs_cpufreq_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ ret = brcm_avs_prepare_init(pdev);
+ if (ret)
+ return ret;
+
+ brcm_avs_driver.driver_data = pdev;
+
+ ret = cpufreq_register_driver(&brcm_avs_driver);
+ if (ret)
+ brcm_avs_prepare_uninit(pdev);
+
+ return ret;
+}
+
+static int brcm_avs_cpufreq_remove(struct platform_device *pdev)
+{
+ cpufreq_unregister_driver(&brcm_avs_driver);
+
+ brcm_avs_prepare_uninit(pdev);
+
+ return 0;
+}
+
+static const struct of_device_id brcm_avs_cpufreq_match[] = {
+ { .compatible = BRCM_AVS_CPU_DATA },
+ { }
+};
+MODULE_DEVICE_TABLE(of, brcm_avs_cpufreq_match);
+
+static struct platform_driver brcm_avs_cpufreq_platdrv = {
+ .driver = {
+ .name = BRCM_AVS_CPUFREQ_NAME,
+ .of_match_table = brcm_avs_cpufreq_match,
+ },
+ .probe = brcm_avs_cpufreq_probe,
+ .remove = brcm_avs_cpufreq_remove,
+};
+module_platform_driver(brcm_avs_cpufreq_platdrv);
+
+MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
+MODULE_DESCRIPTION("CPUfreq driver for Broadcom STB AVS");
+MODULE_LICENSE("GPL");