u-boot/drivers/clk/clk_versal.c
T Karthik Reddy 60b03f1cc4 clk: versal: Add support to enable clocks
Add clock enable functionality in versal clock driver to enable
clocks from peripheral drivers using clk_ops.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2021-02-23 14:56:59 +01:00

749 lines
16 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2019 Xilinx, Inc.
* Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
*/
#include <common.h>
#include <log.h>
#include <asm/cache.h>
#include <asm/ptrace.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/bitfield.h>
#include <malloc.h>
#include <clk-uclass.h>
#include <clk.h>
#include <dm.h>
#include <asm/arch/sys_proto.h>
#include <zynqmp_firmware.h>
#include <linux/err.h>
#define MAX_PARENT 100
#define MAX_NODES 6
#define MAX_NAME_LEN 50
#define CLK_TYPE_SHIFT 2
#define PM_API_PAYLOAD_LEN 3
#define NA_PARENT 0xFFFFFFFF
#define DUMMY_PARENT 0xFFFFFFFE
#define CLK_TYPE_FIELD_LEN 4
#define CLK_TOPOLOGY_NODE_OFFSET 16
#define NODES_PER_RESP 3
#define CLK_TYPE_FIELD_MASK 0xF
#define CLK_FLAG_FIELD_MASK GENMASK(21, 8)
#define CLK_TYPE_FLAG_FIELD_MASK GENMASK(31, 24)
#define CLK_TYPE_FLAG2_FIELD_MASK GENMASK(7, 4)
#define CLK_TYPE_FLAG_BITS 8
#define CLK_PARENTS_ID_LEN 16
#define CLK_PARENTS_ID_MASK 0xFFFF
#define END_OF_TOPOLOGY_NODE 1
#define END_OF_PARENTS 1
#define CLK_VALID_MASK 0x1
#define NODE_CLASS_SHIFT 26U
#define NODE_SUBCLASS_SHIFT 20U
#define NODE_TYPE_SHIFT 14U
#define NODE_INDEX_SHIFT 0U
#define CLK_GET_NAME_RESP_LEN 16
#define CLK_GET_TOPOLOGY_RESP_WORDS 3
#define CLK_GET_PARENTS_RESP_WORDS 3
#define CLK_GET_ATTR_RESP_WORDS 1
#define NODE_SUBCLASS_CLOCK_PLL 1
#define NODE_SUBCLASS_CLOCK_OUT 2
#define NODE_SUBCLASS_CLOCK_REF 3
#define NODE_CLASS_CLOCK 2
#define NODE_CLASS_MASK 0x3F
#define CLOCK_NODE_TYPE_MUX 1
#define CLOCK_NODE_TYPE_DIV 4
#define CLOCK_NODE_TYPE_GATE 6
enum clk_type {
CLK_TYPE_OUTPUT,
CLK_TYPE_EXTERNAL,
};
struct clock_parent {
char name[MAX_NAME_LEN];
int id;
u32 flag;
};
struct clock_topology {
u32 type;
u32 flag;
u32 type_flag;
};
struct versal_clock {
char clk_name[MAX_NAME_LEN];
u32 valid;
enum clk_type type;
struct clock_topology node[MAX_NODES];
u32 num_nodes;
struct clock_parent parent[MAX_PARENT];
u32 num_parents;
u32 clk_id;
};
struct versal_clk_priv {
struct versal_clock *clk;
};
static ulong pl_alt_ref_clk;
static ulong ref_clk;
struct versal_pm_query_data {
u32 qid;
u32 arg1;
u32 arg2;
u32 arg3;
};
static struct versal_clock *clock;
static unsigned int clock_max_idx;
#define PM_QUERY_DATA 35
static int versal_pm_query(struct versal_pm_query_data qdata, u32 *ret_payload)
{
struct pt_regs regs;
regs.regs[0] = PM_SIP_SVC | PM_QUERY_DATA;
regs.regs[1] = ((u64)qdata.arg1 << 32) | qdata.qid;
regs.regs[2] = ((u64)qdata.arg3 << 32) | qdata.arg2;
smc_call(&regs);
if (ret_payload) {
ret_payload[0] = (u32)regs.regs[0];
ret_payload[1] = upper_32_bits(regs.regs[0]);
ret_payload[2] = (u32)regs.regs[1];
ret_payload[3] = upper_32_bits(regs.regs[1]);
ret_payload[4] = (u32)regs.regs[2];
}
return qdata.qid == PM_QID_CLOCK_GET_NAME ? 0 : regs.regs[0];
}
static inline int versal_is_valid_clock(u32 clk_id)
{
if (clk_id >= clock_max_idx)
return -ENODEV;
return clock[clk_id].valid;
}
static int versal_get_clock_name(u32 clk_id, char *clk_name)
{
int ret;
ret = versal_is_valid_clock(clk_id);
if (ret == 1) {
strncpy(clk_name, clock[clk_id].clk_name, MAX_NAME_LEN);
return 0;
}
return ret == 0 ? -EINVAL : ret;
}
static int versal_get_clock_type(u32 clk_id, u32 *type)
{
int ret;
ret = versal_is_valid_clock(clk_id);
if (ret == 1) {
*type = clock[clk_id].type;
return 0;
}
return ret == 0 ? -EINVAL : ret;
}
static int versal_pm_clock_get_num_clocks(u32 *nclocks)
{
struct versal_pm_query_data qdata = {0};
u32 ret_payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_CLOCK_GET_NUM_CLOCKS;
ret = versal_pm_query(qdata, ret_payload);
*nclocks = ret_payload[1];
return ret;
}
static int versal_pm_clock_get_name(u32 clock_id, char *name)
{
struct versal_pm_query_data qdata = {0};
u32 ret_payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_CLOCK_GET_NAME;
qdata.arg1 = clock_id;
ret = versal_pm_query(qdata, ret_payload);
if (ret)
return ret;
memcpy(name, ret_payload, CLK_GET_NAME_RESP_LEN);
return 0;
}
static int versal_pm_clock_get_topology(u32 clock_id, u32 index, u32 *topology)
{
struct versal_pm_query_data qdata = {0};
u32 ret_payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_CLOCK_GET_TOPOLOGY;
qdata.arg1 = clock_id;
qdata.arg2 = index;
ret = versal_pm_query(qdata, ret_payload);
memcpy(topology, &ret_payload[1], CLK_GET_TOPOLOGY_RESP_WORDS * 4);
return ret;
}
static int versal_pm_clock_get_parents(u32 clock_id, u32 index, u32 *parents)
{
struct versal_pm_query_data qdata = {0};
u32 ret_payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_CLOCK_GET_PARENTS;
qdata.arg1 = clock_id;
qdata.arg2 = index;
ret = versal_pm_query(qdata, ret_payload);
memcpy(parents, &ret_payload[1], CLK_GET_PARENTS_RESP_WORDS * 4);
return ret;
}
static int versal_pm_clock_get_attributes(u32 clock_id, u32 *attr)
{
struct versal_pm_query_data qdata = {0};
u32 ret_payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_CLOCK_GET_ATTRIBUTES;
qdata.arg1 = clock_id;
ret = versal_pm_query(qdata, ret_payload);
memcpy(attr, &ret_payload[1], CLK_GET_ATTR_RESP_WORDS * 4);
return ret;
}
static int __versal_clock_get_topology(struct clock_topology *topology,
u32 *data, u32 *nnodes)
{
int i;
for (i = 0; i < PM_API_PAYLOAD_LEN; i++) {
if (!(data[i] & CLK_TYPE_FIELD_MASK))
return END_OF_TOPOLOGY_NODE;
topology[*nnodes].type = data[i] & CLK_TYPE_FIELD_MASK;
topology[*nnodes].flag = FIELD_GET(CLK_FLAG_FIELD_MASK,
data[i]);
topology[*nnodes].type_flag =
FIELD_GET(CLK_TYPE_FLAG_FIELD_MASK, data[i]);
topology[*nnodes].type_flag |=
FIELD_GET(CLK_TYPE_FLAG2_FIELD_MASK, data[i]) <<
CLK_TYPE_FLAG_BITS;
debug("topology type:0x%x, flag:0x%x, type_flag:0x%x\n",
topology[*nnodes].type, topology[*nnodes].flag,
topology[*nnodes].type_flag);
(*nnodes)++;
}
return 0;
}
static int versal_clock_get_topology(u32 clk_id,
struct clock_topology *topology,
u32 *num_nodes)
{
int j, ret;
u32 pm_resp[PM_API_PAYLOAD_LEN] = {0};
*num_nodes = 0;
for (j = 0; j <= MAX_NODES; j += 3) {
ret = versal_pm_clock_get_topology(clock[clk_id].clk_id, j,
pm_resp);
if (ret)
return ret;
ret = __versal_clock_get_topology(topology, pm_resp, num_nodes);
if (ret == END_OF_TOPOLOGY_NODE)
return 0;
}
return 0;
}
static int __versal_clock_get_parents(struct clock_parent *parents, u32 *data,
u32 *nparent)
{
int i;
struct clock_parent *parent;
for (i = 0; i < PM_API_PAYLOAD_LEN; i++) {
if (data[i] == NA_PARENT)
return END_OF_PARENTS;
parent = &parents[i];
parent->id = data[i] & CLK_PARENTS_ID_MASK;
if (data[i] == DUMMY_PARENT) {
strcpy(parent->name, "dummy_name");
parent->flag = 0;
} else {
parent->flag = data[i] >> CLK_PARENTS_ID_LEN;
if (versal_get_clock_name(parent->id, parent->name))
continue;
}
debug("parent name:%s\n", parent->name);
*nparent += 1;
}
return 0;
}
static int versal_clock_get_parents(u32 clk_id, struct clock_parent *parents,
u32 *num_parents)
{
int j = 0, ret;
u32 pm_resp[PM_API_PAYLOAD_LEN] = {0};
*num_parents = 0;
do {
/* Get parents from firmware */
ret = versal_pm_clock_get_parents(clock[clk_id].clk_id, j,
pm_resp);
if (ret)
return ret;
ret = __versal_clock_get_parents(&parents[j], pm_resp,
num_parents);
if (ret == END_OF_PARENTS)
return 0;
j += PM_API_PAYLOAD_LEN;
} while (*num_parents <= MAX_PARENT);
return 0;
}
static u32 versal_clock_get_div(u32 clk_id)
{
u32 ret_payload[PAYLOAD_ARG_CNT];
u32 div;
xilinx_pm_request(PM_CLOCK_GETDIVIDER, clk_id, 0, 0, 0, ret_payload);
div = ret_payload[1];
return div;
}
static u32 versal_clock_set_div(u32 clk_id, u32 div)
{
u32 ret_payload[PAYLOAD_ARG_CNT];
xilinx_pm_request(PM_CLOCK_SETDIVIDER, clk_id, div, 0, 0, ret_payload);
return div;
}
static u64 versal_clock_ref(u32 clk_id)
{
u32 ret_payload[PAYLOAD_ARG_CNT];
int ref;
xilinx_pm_request(PM_CLOCK_GETPARENT, clk_id, 0, 0, 0, ret_payload);
ref = ret_payload[0];
if (!(ref & 1))
return ref_clk;
if (ref & 2)
return pl_alt_ref_clk;
return 0;
}
static u64 versal_clock_get_pll_rate(u32 clk_id)
{
u32 ret_payload[PAYLOAD_ARG_CNT];
u32 fbdiv;
u32 res;
u32 frac;
u64 freq;
u32 parent_rate, parent_id;
u32 id = clk_id & 0xFFF;
xilinx_pm_request(PM_CLOCK_GETSTATE, clk_id, 0, 0, 0, ret_payload);
res = ret_payload[1];
if (!res) {
printf("0%x PLL not enabled\n", clk_id);
return 0;
}
parent_id = clock[clock[id].parent[0].id].clk_id;
parent_rate = versal_clock_ref(parent_id);
xilinx_pm_request(PM_CLOCK_GETDIVIDER, clk_id, 0, 0, 0, ret_payload);
fbdiv = ret_payload[1];
xilinx_pm_request(PM_CLOCK_PLL_GETPARAM, clk_id, 2, 0, 0, ret_payload);
frac = ret_payload[1];
freq = (fbdiv * parent_rate) >> (1 << frac);
return freq;
}
static u32 versal_clock_mux(u32 clk_id)
{
int i;
u32 id = clk_id & 0xFFF;
for (i = 0; i < clock[id].num_nodes; i++)
if (clock[id].node[i].type == CLOCK_NODE_TYPE_MUX)
return 1;
return 0;
}
static u32 versal_clock_get_parentid(u32 clk_id)
{
u32 parent_id = 0;
u32 ret_payload[PAYLOAD_ARG_CNT];
u32 id = clk_id & 0xFFF;
if (versal_clock_mux(clk_id)) {
xilinx_pm_request(PM_CLOCK_GETPARENT, clk_id, 0, 0, 0,
ret_payload);
parent_id = ret_payload[1];
}
debug("parent_id:0x%x\n", clock[clock[id].parent[parent_id].id].clk_id);
return clock[clock[id].parent[parent_id].id].clk_id;
}
static u32 versal_clock_gate(u32 clk_id)
{
u32 id = clk_id & 0xFFF;
int i;
for (i = 0; i < clock[id].num_nodes; i++)
if (clock[id].node[i].type == CLOCK_NODE_TYPE_GATE)
return 1;
return 0;
}
static u32 versal_clock_div(u32 clk_id)
{
int i;
u32 id = clk_id & 0xFFF;
for (i = 0; i < clock[id].num_nodes; i++)
if (clock[id].node[i].type == CLOCK_NODE_TYPE_DIV)
return 1;
return 0;
}
static u32 versal_clock_pll(u32 clk_id, u64 *clk_rate)
{
if (((clk_id >> NODE_SUBCLASS_SHIFT) & NODE_CLASS_MASK) ==
NODE_SUBCLASS_CLOCK_PLL &&
((clk_id >> NODE_CLASS_SHIFT) & NODE_CLASS_MASK) ==
NODE_CLASS_CLOCK) {
*clk_rate = versal_clock_get_pll_rate(clk_id);
return 1;
}
return 0;
}
static u64 versal_clock_calc(u32 clk_id)
{
u32 parent_id;
u64 clk_rate;
u32 div;
if (versal_clock_pll(clk_id, &clk_rate))
return clk_rate;
parent_id = versal_clock_get_parentid(clk_id);
if (((parent_id >> NODE_SUBCLASS_SHIFT) &
NODE_CLASS_MASK) == NODE_SUBCLASS_CLOCK_REF)
return versal_clock_ref(clk_id);
if (!parent_id)
return 0;
clk_rate = versal_clock_calc(parent_id);
if (versal_clock_div(clk_id)) {
div = versal_clock_get_div(clk_id);
clk_rate = DIV_ROUND_CLOSEST(clk_rate, div);
}
return clk_rate;
}
static int versal_clock_get_rate(u32 clk_id, u64 *clk_rate)
{
if (((clk_id >> NODE_SUBCLASS_SHIFT) &
NODE_CLASS_MASK) == NODE_SUBCLASS_CLOCK_REF)
*clk_rate = versal_clock_ref(clk_id);
if (versal_clock_pll(clk_id, clk_rate))
return 0;
if (((clk_id >> NODE_SUBCLASS_SHIFT) &
NODE_CLASS_MASK) == NODE_SUBCLASS_CLOCK_OUT &&
((clk_id >> NODE_CLASS_SHIFT) &
NODE_CLASS_MASK) == NODE_CLASS_CLOCK) {
if (!versal_clock_gate(clk_id) && !versal_clock_mux(clk_id))
return -EINVAL;
*clk_rate = versal_clock_calc(clk_id);
return 0;
}
return 0;
}
int soc_clk_dump(void)
{
u64 clk_rate = 0;
u32 type, ret, i = 0;
printf("\n ****** VERSAL CLOCKS *****\n");
printf("pl_alt_ref_clk:%ld ref_clk:%ld\n", pl_alt_ref_clk, ref_clk);
for (i = 0; i < clock_max_idx; i++) {
debug("%s\n", clock[i].clk_name);
ret = versal_get_clock_type(i, &type);
if (ret || type != CLK_TYPE_OUTPUT)
continue;
ret = versal_clock_get_rate(clock[i].clk_id, &clk_rate);
if (ret != -EINVAL)
printf("clk: %s freq:%lld\n",
clock[i].clk_name, clk_rate);
}
return 0;
}
static void versal_get_clock_info(void)
{
int i, ret;
u32 attr, type = 0, nodetype, subclass, class;
for (i = 0; i < clock_max_idx; i++) {
ret = versal_pm_clock_get_attributes(i, &attr);
if (ret)
continue;
clock[i].valid = attr & CLK_VALID_MASK;
/* skip query for Invalid clock */
ret = versal_is_valid_clock(i);
if (ret != CLK_VALID_MASK)
continue;
clock[i].type = ((attr >> CLK_TYPE_SHIFT) & 0x1) ?
CLK_TYPE_EXTERNAL : CLK_TYPE_OUTPUT;
nodetype = (attr >> NODE_TYPE_SHIFT) & NODE_CLASS_MASK;
subclass = (attr >> NODE_SUBCLASS_SHIFT) & NODE_CLASS_MASK;
class = (attr >> NODE_CLASS_SHIFT) & NODE_CLASS_MASK;
clock[i].clk_id = (class << NODE_CLASS_SHIFT) |
(subclass << NODE_SUBCLASS_SHIFT) |
(nodetype << NODE_TYPE_SHIFT) |
(i << NODE_INDEX_SHIFT);
ret = versal_pm_clock_get_name(clock[i].clk_id,
clock[i].clk_name);
if (ret)
continue;
debug("clk name:%s, Valid:%d, type:%d, clk_id:0x%x\n",
clock[i].clk_name, clock[i].valid,
clock[i].type, clock[i].clk_id);
}
/* Get topology of all clock */
for (i = 0; i < clock_max_idx; i++) {
ret = versal_get_clock_type(i, &type);
if (ret || type != CLK_TYPE_OUTPUT)
continue;
debug("clk name:%s\n", clock[i].clk_name);
ret = versal_clock_get_topology(i, clock[i].node,
&clock[i].num_nodes);
if (ret)
continue;
ret = versal_clock_get_parents(i, clock[i].parent,
&clock[i].num_parents);
if (ret)
continue;
}
}
int versal_clock_setup(void)
{
int ret;
ret = versal_pm_clock_get_num_clocks(&clock_max_idx);
if (ret)
return ret;
debug("%s, clock_max_idx:0x%x\n", __func__, clock_max_idx);
clock = calloc(clock_max_idx, sizeof(*clock));
if (!clock)
return -ENOMEM;
versal_get_clock_info();
return 0;
}
static int versal_clock_get_freq_by_name(char *name, struct udevice *dev,
ulong *freq)
{
struct clk clk;
int ret;
ret = clk_get_by_name(dev, name, &clk);
if (ret < 0) {
dev_err(dev, "failed to get %s\n", name);
return ret;
}
*freq = clk_get_rate(&clk);
if (IS_ERR_VALUE(*freq)) {
dev_err(dev, "failed to get rate %s\n", name);
return -EINVAL;
}
return 0;
}
static int versal_clk_probe(struct udevice *dev)
{
int ret;
struct versal_clk_priv *priv = dev_get_priv(dev);
debug("%s\n", __func__);
ret = versal_clock_get_freq_by_name("pl_alt_ref_clk",
dev, &pl_alt_ref_clk);
if (ret < 0)
return -EINVAL;
ret = versal_clock_get_freq_by_name("ref_clk", dev, &ref_clk);
if (ret < 0)
return -EINVAL;
versal_clock_setup();
priv->clk = clock;
return ret;
}
static ulong versal_clk_get_rate(struct clk *clk)
{
struct versal_clk_priv *priv = dev_get_priv(clk->dev);
u32 id = clk->id;
u32 clk_id;
u64 clk_rate = 0;
debug("%s\n", __func__);
clk_id = priv->clk[id].clk_id;
versal_clock_get_rate(clk_id, &clk_rate);
return clk_rate;
}
static ulong versal_clk_set_rate(struct clk *clk, ulong rate)
{
struct versal_clk_priv *priv = dev_get_priv(clk->dev);
u32 id = clk->id;
u32 clk_id;
u64 clk_rate = 0;
u32 div;
int ret;
debug("%s\n", __func__);
clk_id = priv->clk[id].clk_id;
ret = versal_clock_get_rate(clk_id, &clk_rate);
if (ret) {
printf("Clock is not a Gate:0x%x\n", clk_id);
return 0;
}
do {
if (versal_clock_div(clk_id)) {
div = versal_clock_get_div(clk_id);
clk_rate *= div;
div = DIV_ROUND_CLOSEST(clk_rate, rate);
versal_clock_set_div(clk_id, div);
debug("%s, div:%d, newrate:%lld\n", __func__,
div, DIV_ROUND_CLOSEST(clk_rate, div));
return DIV_ROUND_CLOSEST(clk_rate, div);
}
clk_id = versal_clock_get_parentid(clk_id);
} while (((clk_id >> NODE_SUBCLASS_SHIFT) &
NODE_CLASS_MASK) != NODE_SUBCLASS_CLOCK_REF);
printf("Clock didn't has Divisors:0x%x\n", priv->clk[id].clk_id);
return clk_rate;
}
static int versal_clk_enable(struct clk *clk)
{
struct versal_clk_priv *priv = dev_get_priv(clk->dev);
u32 clk_id;
clk_id = priv->clk[clk->id].clk_id;
return xilinx_pm_request(PM_CLOCK_ENABLE, clk_id, 0, 0, 0, NULL);
}
static struct clk_ops versal_clk_ops = {
.set_rate = versal_clk_set_rate,
.get_rate = versal_clk_get_rate,
.enable = versal_clk_enable,
};
static const struct udevice_id versal_clk_ids[] = {
{ .compatible = "xlnx,versal-clk" },
{ }
};
U_BOOT_DRIVER(versal_clk) = {
.name = "versal-clk",
.id = UCLASS_CLK,
.of_match = versal_clk_ids,
.probe = versal_clk_probe,
.ops = &versal_clk_ops,
.priv_auto = sizeof(struct versal_clk_priv),
};