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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/soc/xilinx/xlnx_vcu.c

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18 KiB
C
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// SPDX-License-Identifier: GPL-2.0
/*
* Xilinx VCU Init
*
* Copyright (C) 2016 - 2017 Xilinx, Inc.
*
* Contacts Dhaval Shah <dshah@xilinx.com>
*/
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/xlnx-vcu.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
/* vcu slcr registers, bitmask and shift */
#define VCU_PLL_CTRL 0x24
#define VCU_PLL_CTRL_RESET_MASK 0x01
#define VCU_PLL_CTRL_RESET_SHIFT 0
#define VCU_PLL_CTRL_BYPASS_MASK 0x01
#define VCU_PLL_CTRL_BYPASS_SHIFT 3
#define VCU_PLL_CTRL_FBDIV_MASK 0x7f
#define VCU_PLL_CTRL_FBDIV_SHIFT 8
#define VCU_PLL_CTRL_POR_IN_MASK 0x01
#define VCU_PLL_CTRL_POR_IN_SHIFT 1
#define VCU_PLL_CTRL_PWR_POR_MASK 0x01
#define VCU_PLL_CTRL_PWR_POR_SHIFT 2
#define VCU_PLL_CTRL_CLKOUTDIV_MASK 0x03
#define VCU_PLL_CTRL_CLKOUTDIV_SHIFT 16
#define VCU_PLL_CTRL_DEFAULT 0
#define VCU_PLL_DIV2 2
#define VCU_PLL_CFG 0x28
#define VCU_PLL_CFG_RES_MASK 0x0f
#define VCU_PLL_CFG_RES_SHIFT 0
#define VCU_PLL_CFG_CP_MASK 0x0f
#define VCU_PLL_CFG_CP_SHIFT 5
#define VCU_PLL_CFG_LFHF_MASK 0x03
#define VCU_PLL_CFG_LFHF_SHIFT 10
#define VCU_PLL_CFG_LOCK_CNT_MASK 0x03ff
#define VCU_PLL_CFG_LOCK_CNT_SHIFT 13
#define VCU_PLL_CFG_LOCK_DLY_MASK 0x7f
#define VCU_PLL_CFG_LOCK_DLY_SHIFT 25
#define VCU_ENC_CORE_CTRL 0x30
#define VCU_ENC_MCU_CTRL 0x34
#define VCU_DEC_CORE_CTRL 0x38
#define VCU_DEC_MCU_CTRL 0x3c
#define VCU_PLL_DIVISOR_MASK 0x3f
#define VCU_PLL_DIVISOR_SHIFT 4
#define VCU_SRCSEL_MASK 0x01
#define VCU_SRCSEL_SHIFT 0
#define VCU_SRCSEL_PLL 1
#define VCU_PLL_STATUS 0x60
#define VCU_PLL_STATUS_LOCK_STATUS_MASK 0x01
#define MHZ 1000000
#define FVCO_MIN (1500U * MHZ)
#define FVCO_MAX (3000U * MHZ)
#define DIVISOR_MIN 0
#define DIVISOR_MAX 63
#define FRAC 100
#define LIMIT (10 * MHZ)
/**
* struct xvcu_device - Xilinx VCU init device structure
* @dev: Platform device
* @pll_ref: pll ref clock source
* @aclk: axi clock source
* @logicore_reg_ba: logicore reg base address
* @vcu_slcr_ba: vcu_slcr Register base address
* @coreclk: core clock frequency
*/
struct xvcu_device {
struct device *dev;
struct clk *pll_ref;
struct clk *aclk;
struct regmap *logicore_reg_ba;
void __iomem *vcu_slcr_ba;
u32 coreclk;
};
static struct regmap_config vcu_settings_regmap_config = {
.name = "regmap",
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0xfff,
.cache_type = REGCACHE_NONE,
};
/**
* struct xvcu_pll_cfg - Helper data
* @fbdiv: The integer portion of the feedback divider to the PLL
* @cp: PLL charge pump control
* @res: PLL loop filter resistor control
* @lfhf: PLL loop filter high frequency capacitor control
* @lock_dly: Lock circuit configuration settings for lock windowsize
* @lock_cnt: Lock circuit counter setting
*/
struct xvcu_pll_cfg {
u32 fbdiv;
u32 cp;
u32 res;
u32 lfhf;
u32 lock_dly;
u32 lock_cnt;
};
static const struct xvcu_pll_cfg xvcu_pll_cfg[] = {
{ 25, 3, 10, 3, 63, 1000 },
{ 26, 3, 10, 3, 63, 1000 },
{ 27, 4, 6, 3, 63, 1000 },
{ 28, 4, 6, 3, 63, 1000 },
{ 29, 4, 6, 3, 63, 1000 },
{ 30, 4, 6, 3, 63, 1000 },
{ 31, 6, 1, 3, 63, 1000 },
{ 32, 6, 1, 3, 63, 1000 },
{ 33, 4, 10, 3, 63, 1000 },
{ 34, 5, 6, 3, 63, 1000 },
{ 35, 5, 6, 3, 63, 1000 },
{ 36, 5, 6, 3, 63, 1000 },
{ 37, 5, 6, 3, 63, 1000 },
{ 38, 5, 6, 3, 63, 975 },
{ 39, 3, 12, 3, 63, 950 },
{ 40, 3, 12, 3, 63, 925 },
{ 41, 3, 12, 3, 63, 900 },
{ 42, 3, 12, 3, 63, 875 },
{ 43, 3, 12, 3, 63, 850 },
{ 44, 3, 12, 3, 63, 850 },
{ 45, 3, 12, 3, 63, 825 },
{ 46, 3, 12, 3, 63, 800 },
{ 47, 3, 12, 3, 63, 775 },
{ 48, 3, 12, 3, 63, 775 },
{ 49, 3, 12, 3, 63, 750 },
{ 50, 3, 12, 3, 63, 750 },
{ 51, 3, 2, 3, 63, 725 },
{ 52, 3, 2, 3, 63, 700 },
{ 53, 3, 2, 3, 63, 700 },
{ 54, 3, 2, 3, 63, 675 },
{ 55, 3, 2, 3, 63, 675 },
{ 56, 3, 2, 3, 63, 650 },
{ 57, 3, 2, 3, 63, 650 },
{ 58, 3, 2, 3, 63, 625 },
{ 59, 3, 2, 3, 63, 625 },
{ 60, 3, 2, 3, 63, 625 },
{ 61, 3, 2, 3, 63, 600 },
{ 62, 3, 2, 3, 63, 600 },
{ 63, 3, 2, 3, 63, 600 },
{ 64, 3, 2, 3, 63, 600 },
{ 65, 3, 2, 3, 63, 600 },
{ 66, 3, 2, 3, 63, 600 },
{ 67, 3, 2, 3, 63, 600 },
{ 68, 3, 2, 3, 63, 600 },
{ 69, 3, 2, 3, 63, 600 },
{ 70, 3, 2, 3, 63, 600 },
{ 71, 3, 2, 3, 63, 600 },
{ 72, 3, 2, 3, 63, 600 },
{ 73, 3, 2, 3, 63, 600 },
{ 74, 3, 2, 3, 63, 600 },
{ 75, 3, 2, 3, 63, 600 },
{ 76, 3, 2, 3, 63, 600 },
{ 77, 3, 2, 3, 63, 600 },
{ 78, 3, 2, 3, 63, 600 },
{ 79, 3, 2, 3, 63, 600 },
{ 80, 3, 2, 3, 63, 600 },
{ 81, 3, 2, 3, 63, 600 },
{ 82, 3, 2, 3, 63, 600 },
{ 83, 4, 2, 3, 63, 600 },
{ 84, 4, 2, 3, 63, 600 },
{ 85, 4, 2, 3, 63, 600 },
{ 86, 4, 2, 3, 63, 600 },
{ 87, 4, 2, 3, 63, 600 },
{ 88, 4, 2, 3, 63, 600 },
{ 89, 4, 2, 3, 63, 600 },
{ 90, 4, 2, 3, 63, 600 },
{ 91, 4, 2, 3, 63, 600 },
{ 92, 4, 2, 3, 63, 600 },
{ 93, 4, 2, 3, 63, 600 },
{ 94, 4, 2, 3, 63, 600 },
{ 95, 4, 2, 3, 63, 600 },
{ 96, 4, 2, 3, 63, 600 },
{ 97, 4, 2, 3, 63, 600 },
{ 98, 4, 2, 3, 63, 600 },
{ 99, 4, 2, 3, 63, 600 },
{ 100, 4, 2, 3, 63, 600 },
{ 101, 4, 2, 3, 63, 600 },
{ 102, 4, 2, 3, 63, 600 },
{ 103, 5, 2, 3, 63, 600 },
{ 104, 5, 2, 3, 63, 600 },
{ 105, 5, 2, 3, 63, 600 },
{ 106, 5, 2, 3, 63, 600 },
{ 107, 3, 4, 3, 63, 600 },
{ 108, 3, 4, 3, 63, 600 },
{ 109, 3, 4, 3, 63, 600 },
{ 110, 3, 4, 3, 63, 600 },
{ 111, 3, 4, 3, 63, 600 },
{ 112, 3, 4, 3, 63, 600 },
{ 113, 3, 4, 3, 63, 600 },
{ 114, 3, 4, 3, 63, 600 },
{ 115, 3, 4, 3, 63, 600 },
{ 116, 3, 4, 3, 63, 600 },
{ 117, 3, 4, 3, 63, 600 },
{ 118, 3, 4, 3, 63, 600 },
{ 119, 3, 4, 3, 63, 600 },
{ 120, 3, 4, 3, 63, 600 },
{ 121, 3, 4, 3, 63, 600 },
{ 122, 3, 4, 3, 63, 600 },
{ 123, 3, 4, 3, 63, 600 },
{ 124, 3, 4, 3, 63, 600 },
{ 125, 3, 4, 3, 63, 600 },
};
/**
* xvcu_read - Read from the VCU register space
* @iomem: vcu reg space base address
* @offset: vcu reg offset from base
*
* Return: Returns 32bit value from VCU register specified
*
*/
static inline u32 xvcu_read(void __iomem *iomem, u32 offset)
{
return ioread32(iomem + offset);
}
/**
* xvcu_write - Write to the VCU register space
* @iomem: vcu reg space base address
* @offset: vcu reg offset from base
* @value: Value to write
*/
static inline void xvcu_write(void __iomem *iomem, u32 offset, u32 value)
{
iowrite32(value, iomem + offset);
}
/**
* xvcu_write_field_reg - Write to the vcu reg field
* @iomem: vcu reg space base address
* @offset: vcu reg offset from base
* @field: vcu reg field to write to
* @mask: vcu reg mask
* @shift: vcu reg number of bits to shift the bitfield
*/
static void xvcu_write_field_reg(void __iomem *iomem, int offset,
u32 field, u32 mask, int shift)
{
u32 val = xvcu_read(iomem, offset);
val &= ~(mask << shift);
val |= (field & mask) << shift;
xvcu_write(iomem, offset, val);
}
/**
* xvcu_set_vcu_pll_info - Set the VCU PLL info
* @xvcu: Pointer to the xvcu_device structure
*
* Programming the VCU PLL based on the user configuration
* (ref clock freq, core clock freq, mcu clock freq).
* Core clock frequency has higher priority than mcu clock frequency
* Errors in following cases
* - When mcu or clock clock get from logicoreIP is 0
* - When VCU PLL DIV related bits value other than 1
* - When proper data not found for given data
* - When sis570_1 clocksource related operation failed
*
* Return: Returns status, either success or error+reason
*/
static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu)
{
u32 refclk, coreclk, mcuclk, inte, deci;
u32 divisor_mcu, divisor_core, fvco;
u32 clkoutdiv, vcu_pll_ctrl, pll_clk;
u32 cfg_val, mod, ctrl;
int ret, i;
const struct xvcu_pll_cfg *found = NULL;
regmap_read(xvcu->logicore_reg_ba, VCU_PLL_CLK, &inte);
regmap_read(xvcu->logicore_reg_ba, VCU_PLL_CLK_DEC, &deci);
regmap_read(xvcu->logicore_reg_ba, VCU_CORE_CLK, &coreclk);
coreclk *= MHZ;
regmap_read(xvcu->logicore_reg_ba, VCU_MCU_CLK, &mcuclk);
mcuclk *= MHZ;
if (!mcuclk || !coreclk) {
dev_err(xvcu->dev, "Invalid mcu and core clock data\n");
return -EINVAL;
}
refclk = (inte * MHZ) + (deci * (MHZ / FRAC));
dev_dbg(xvcu->dev, "Ref clock from logicoreIP is %uHz\n", refclk);
dev_dbg(xvcu->dev, "Core clock from logicoreIP is %uHz\n", coreclk);
dev_dbg(xvcu->dev, "Mcu clock from logicoreIP is %uHz\n", mcuclk);
clk_disable_unprepare(xvcu->pll_ref);
ret = clk_set_rate(xvcu->pll_ref, refclk);
if (ret)
dev_warn(xvcu->dev, "failed to set logicoreIP refclk rate\n");
ret = clk_prepare_enable(xvcu->pll_ref);
if (ret) {
dev_err(xvcu->dev, "failed to enable pll_ref clock source\n");
return ret;
}
refclk = clk_get_rate(xvcu->pll_ref);
/*
* The divide-by-2 should be always enabled (==1)
* to meet the timing in the design.
* Otherwise, it's an error
*/
vcu_pll_ctrl = xvcu_read(xvcu->vcu_slcr_ba, VCU_PLL_CTRL);
clkoutdiv = vcu_pll_ctrl >> VCU_PLL_CTRL_CLKOUTDIV_SHIFT;
clkoutdiv = clkoutdiv & VCU_PLL_CTRL_CLKOUTDIV_MASK;
if (clkoutdiv != 1) {
dev_err(xvcu->dev, "clkoutdiv value is invalid\n");
return -EINVAL;
}
for (i = ARRAY_SIZE(xvcu_pll_cfg) - 1; i >= 0; i--) {
const struct xvcu_pll_cfg *cfg = &xvcu_pll_cfg[i];
fvco = cfg->fbdiv * refclk;
if (fvco >= FVCO_MIN && fvco <= FVCO_MAX) {
pll_clk = fvco / VCU_PLL_DIV2;
if (fvco % VCU_PLL_DIV2 != 0)
pll_clk++;
mod = pll_clk % coreclk;
if (mod < LIMIT) {
divisor_core = pll_clk / coreclk;
} else if (coreclk - mod < LIMIT) {
divisor_core = pll_clk / coreclk;
divisor_core++;
} else {
continue;
}
if (divisor_core >= DIVISOR_MIN &&
divisor_core <= DIVISOR_MAX) {
found = cfg;
divisor_mcu = pll_clk / mcuclk;
mod = pll_clk % mcuclk;
if (mcuclk - mod < LIMIT)
divisor_mcu++;
break;
}
}
}
if (!found) {
dev_err(xvcu->dev, "Invalid clock combination.\n");
return -EINVAL;
}
xvcu->coreclk = pll_clk / divisor_core;
mcuclk = pll_clk / divisor_mcu;
dev_dbg(xvcu->dev, "Actual Ref clock freq is %uHz\n", refclk);
dev_dbg(xvcu->dev, "Actual Core clock freq is %uHz\n", xvcu->coreclk);
dev_dbg(xvcu->dev, "Actual Mcu clock freq is %uHz\n", mcuclk);
vcu_pll_ctrl &= ~(VCU_PLL_CTRL_FBDIV_MASK << VCU_PLL_CTRL_FBDIV_SHIFT);
vcu_pll_ctrl |= (found->fbdiv & VCU_PLL_CTRL_FBDIV_MASK) <<
VCU_PLL_CTRL_FBDIV_SHIFT;
vcu_pll_ctrl &= ~(VCU_PLL_CTRL_POR_IN_MASK <<
VCU_PLL_CTRL_POR_IN_SHIFT);
vcu_pll_ctrl |= (VCU_PLL_CTRL_DEFAULT & VCU_PLL_CTRL_POR_IN_MASK) <<
VCU_PLL_CTRL_POR_IN_SHIFT;
vcu_pll_ctrl &= ~(VCU_PLL_CTRL_PWR_POR_MASK <<
VCU_PLL_CTRL_PWR_POR_SHIFT);
vcu_pll_ctrl |= (VCU_PLL_CTRL_DEFAULT & VCU_PLL_CTRL_PWR_POR_MASK) <<
VCU_PLL_CTRL_PWR_POR_SHIFT;
xvcu_write(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, vcu_pll_ctrl);
/* Set divisor for the core and mcu clock */
ctrl = xvcu_read(xvcu->vcu_slcr_ba, VCU_ENC_CORE_CTRL);
ctrl &= ~(VCU_PLL_DIVISOR_MASK << VCU_PLL_DIVISOR_SHIFT);
ctrl |= (divisor_core & VCU_PLL_DIVISOR_MASK) <<
VCU_PLL_DIVISOR_SHIFT;
ctrl &= ~(VCU_SRCSEL_MASK << VCU_SRCSEL_SHIFT);
ctrl |= (VCU_SRCSEL_PLL & VCU_SRCSEL_MASK) << VCU_SRCSEL_SHIFT;
xvcu_write(xvcu->vcu_slcr_ba, VCU_ENC_CORE_CTRL, ctrl);
ctrl = xvcu_read(xvcu->vcu_slcr_ba, VCU_DEC_CORE_CTRL);
ctrl &= ~(VCU_PLL_DIVISOR_MASK << VCU_PLL_DIVISOR_SHIFT);
ctrl |= (divisor_core & VCU_PLL_DIVISOR_MASK) <<
VCU_PLL_DIVISOR_SHIFT;
ctrl &= ~(VCU_SRCSEL_MASK << VCU_SRCSEL_SHIFT);
ctrl |= (VCU_SRCSEL_PLL & VCU_SRCSEL_MASK) << VCU_SRCSEL_SHIFT;
xvcu_write(xvcu->vcu_slcr_ba, VCU_DEC_CORE_CTRL, ctrl);
ctrl = xvcu_read(xvcu->vcu_slcr_ba, VCU_ENC_MCU_CTRL);
ctrl &= ~(VCU_PLL_DIVISOR_MASK << VCU_PLL_DIVISOR_SHIFT);
ctrl |= (divisor_mcu & VCU_PLL_DIVISOR_MASK) << VCU_PLL_DIVISOR_SHIFT;
ctrl &= ~(VCU_SRCSEL_MASK << VCU_SRCSEL_SHIFT);
ctrl |= (VCU_SRCSEL_PLL & VCU_SRCSEL_MASK) << VCU_SRCSEL_SHIFT;
xvcu_write(xvcu->vcu_slcr_ba, VCU_ENC_MCU_CTRL, ctrl);
ctrl = xvcu_read(xvcu->vcu_slcr_ba, VCU_DEC_MCU_CTRL);
ctrl &= ~(VCU_PLL_DIVISOR_MASK << VCU_PLL_DIVISOR_SHIFT);
ctrl |= (divisor_mcu & VCU_PLL_DIVISOR_MASK) << VCU_PLL_DIVISOR_SHIFT;
ctrl &= ~(VCU_SRCSEL_MASK << VCU_SRCSEL_SHIFT);
ctrl |= (VCU_SRCSEL_PLL & VCU_SRCSEL_MASK) << VCU_SRCSEL_SHIFT;
xvcu_write(xvcu->vcu_slcr_ba, VCU_DEC_MCU_CTRL, ctrl);
/* Set RES, CP, LFHF, LOCK_CNT and LOCK_DLY cfg values */
cfg_val = (found->res << VCU_PLL_CFG_RES_SHIFT) |
(found->cp << VCU_PLL_CFG_CP_SHIFT) |
(found->lfhf << VCU_PLL_CFG_LFHF_SHIFT) |
(found->lock_cnt << VCU_PLL_CFG_LOCK_CNT_SHIFT) |
(found->lock_dly << VCU_PLL_CFG_LOCK_DLY_SHIFT);
xvcu_write(xvcu->vcu_slcr_ba, VCU_PLL_CFG, cfg_val);
return 0;
}
/**
* xvcu_set_pll - PLL init sequence
* @xvcu: Pointer to the xvcu_device structure
*
* Call the api to set the PLL info and once that is done then
* init the PLL sequence to make the PLL stable.
*
* Return: Returns status, either success or error+reason
*/
static int xvcu_set_pll(struct xvcu_device *xvcu)
{
u32 lock_status;
unsigned long timeout;
int ret;
ret = xvcu_set_vcu_pll_info(xvcu);
if (ret) {
dev_err(xvcu->dev, "failed to set pll info\n");
return ret;
}
xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL,
1, VCU_PLL_CTRL_BYPASS_MASK,
VCU_PLL_CTRL_BYPASS_SHIFT);
xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL,
1, VCU_PLL_CTRL_RESET_MASK,
VCU_PLL_CTRL_RESET_SHIFT);
xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL,
0, VCU_PLL_CTRL_RESET_MASK,
VCU_PLL_CTRL_RESET_SHIFT);
/*
* Defined the timeout for the max time to wait the
* PLL_STATUS to be locked.
*/
timeout = jiffies + msecs_to_jiffies(2000);
do {
lock_status = xvcu_read(xvcu->vcu_slcr_ba, VCU_PLL_STATUS);
if (lock_status & VCU_PLL_STATUS_LOCK_STATUS_MASK) {
xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL,
0, VCU_PLL_CTRL_BYPASS_MASK,
VCU_PLL_CTRL_BYPASS_SHIFT);
return 0;
}
} while (!time_after(jiffies, timeout));
/* PLL is not locked even after the timeout of the 2sec */
dev_err(xvcu->dev, "PLL is not locked\n");
return -ETIMEDOUT;
}
/**
* xvcu_probe - Probe existence of the logicoreIP
* and initialize PLL
*
* @pdev: Pointer to the platform_device structure
*
* Return: Returns 0 on success
* Negative error code otherwise
*/
static int xvcu_probe(struct platform_device *pdev)
{
struct resource *res;
struct xvcu_device *xvcu;
void __iomem *regs;
int ret;
xvcu = devm_kzalloc(&pdev->dev, sizeof(*xvcu), GFP_KERNEL);
if (!xvcu)
return -ENOMEM;
xvcu->dev = &pdev->dev;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vcu_slcr");
if (!res) {
dev_err(&pdev->dev, "get vcu_slcr memory resource failed.\n");
return -ENODEV;
}
xvcu->vcu_slcr_ba = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!xvcu->vcu_slcr_ba) {
dev_err(&pdev->dev, "vcu_slcr register mapping failed.\n");
return -ENOMEM;
}
xvcu->logicore_reg_ba =
syscon_regmap_lookup_by_compatible("xlnx,vcu-settings");
if (IS_ERR(xvcu->logicore_reg_ba)) {
dev_info(&pdev->dev,
"could not find xlnx,vcu-settings: trying direct register access\n");
res = platform_get_resource_byname(pdev,
IORESOURCE_MEM, "logicore");
if (!res) {
dev_err(&pdev->dev, "get logicore memory resource failed.\n");
return -ENODEV;
}
regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!regs) {
dev_err(&pdev->dev, "logicore register mapping failed.\n");
return -ENOMEM;
}
xvcu->logicore_reg_ba =
devm_regmap_init_mmio(&pdev->dev, regs,
&vcu_settings_regmap_config);
if (IS_ERR(xvcu->logicore_reg_ba)) {
dev_err(&pdev->dev, "failed to init regmap\n");
return PTR_ERR(xvcu->logicore_reg_ba);
}
}
xvcu->aclk = devm_clk_get(&pdev->dev, "aclk");
if (IS_ERR(xvcu->aclk)) {
dev_err(&pdev->dev, "Could not get aclk clock\n");
return PTR_ERR(xvcu->aclk);
}
xvcu->pll_ref = devm_clk_get(&pdev->dev, "pll_ref");
if (IS_ERR(xvcu->pll_ref)) {
dev_err(&pdev->dev, "Could not get pll_ref clock\n");
return PTR_ERR(xvcu->pll_ref);
}
ret = clk_prepare_enable(xvcu->aclk);
if (ret) {
dev_err(&pdev->dev, "aclk clock enable failed\n");
return ret;
}
ret = clk_prepare_enable(xvcu->pll_ref);
if (ret) {
dev_err(&pdev->dev, "pll_ref clock enable failed\n");
goto error_aclk;
}
/*
* Do the Gasket isolation and put the VCU out of reset
* Bit 0 : Gasket isolation
* Bit 1 : put VCU out of reset
*/
regmap_write(xvcu->logicore_reg_ba, VCU_GASKET_INIT, VCU_GASKET_VALUE);
/* Do the PLL Settings based on the ref clk,core and mcu clk freq */
ret = xvcu_set_pll(xvcu);
if (ret) {
dev_err(&pdev->dev, "Failed to set the pll\n");
goto error_pll_ref;
}
dev_set_drvdata(&pdev->dev, xvcu);
return 0;
error_pll_ref:
clk_disable_unprepare(xvcu->pll_ref);
error_aclk:
clk_disable_unprepare(xvcu->aclk);
return ret;
}
/**
* xvcu_remove - Insert gasket isolation
* and disable the clock
* @pdev: Pointer to the platform_device structure
*
* Return: Returns 0 on success
* Negative error code otherwise
*/
static int xvcu_remove(struct platform_device *pdev)
{
struct xvcu_device *xvcu;
xvcu = platform_get_drvdata(pdev);
if (!xvcu)
return -ENODEV;
/* Add the the Gasket isolation and put the VCU in reset. */
regmap_write(xvcu->logicore_reg_ba, VCU_GASKET_INIT, 0);
clk_disable_unprepare(xvcu->pll_ref);
clk_disable_unprepare(xvcu->aclk);
return 0;
}
static const struct of_device_id xvcu_of_id_table[] = {
{ .compatible = "xlnx,vcu" },
{ .compatible = "xlnx,vcu-logicoreip-1.0" },
{ }
};
MODULE_DEVICE_TABLE(of, xvcu_of_id_table);
static struct platform_driver xvcu_driver = {
.driver = {
.name = "xilinx-vcu",
.of_match_table = xvcu_of_id_table,
},
.probe = xvcu_probe,
.remove = xvcu_remove,
};
module_platform_driver(xvcu_driver);
MODULE_AUTHOR("Dhaval Shah <dshah@xilinx.com>");
MODULE_DESCRIPTION("Xilinx VCU init Driver");
MODULE_LICENSE("GPL v2");
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