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linux/drivers/phy/hisilicon/phy-hi3670-pcie.c
Dan Carpenter f0ae8685b2 phy: HiSilicon: Fix copy and paste bug in error handling 
This should check ">pmctrl" instead of "->sysctrl".  This bug could
potentially lead to a crash if we dereference the error pointer.

Fixes: 73075011ff ("phy: HiSilicon: Add driver for Kirin 970 PCIe PHY")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/20211117074843.GE5237@kili
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2021-11-23 10:42:13 +05:30

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// SPDX-License-Identifier: GPL-2.0
/*
* PCIe phy driver for Kirin 970
*
* Copyright (C) 2017 HiSilicon Electronics Co., Ltd.
* https://www.huawei.com
* Copyright (C) 2021 Huawei Technologies Co., Ltd.
* https://www.huawei.com
*
* Authors:
* Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
* Manivannan Sadhasivam <mani@kernel.org>
*
* Based on:
* https://lore.kernel.org/lkml/4c9d6581478aa966698758c0420933f5defab4dd.1612335031.git.mchehab+huawei@kernel.org/
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define AXI_CLK_FREQ 207500000
#define REF_CLK_FREQ 100000000
/* PCIe CTRL registers */
#define SOC_PCIECTRL_CTRL7_ADDR 0x01c
#define SOC_PCIECTRL_CTRL12_ADDR 0x030
#define SOC_PCIECTRL_CTRL20_ADDR 0x050
#define SOC_PCIECTRL_CTRL21_ADDR 0x054
#define PCIE_OUTPUT_PULL_BITS GENMASK(3, 0)
#define SOC_PCIECTRL_CTRL20_2P_MEM_CTRL 0x02605550
#define SOC_PCIECTRL_CTRL21_DEFAULT 0x20000070
#define PCIE_PULL_UP_SYS_AUX_PWR_DET BIT(10)
#define PCIE_OUTPUT_PULL_DOWN BIT(1)
/* PCIe PHY registers */
#define SOC_PCIEPHY_CTRL0_ADDR 0x000
#define SOC_PCIEPHY_CTRL1_ADDR 0x004
#define SOC_PCIEPHY_CTRL38_ADDR 0x0098
#define SOC_PCIEPHY_STATE0_ADDR 0x400
#define RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1 0xc004
#define SUP_DIG_LVL_OVRD_IN 0x003c
#define LANEN_DIG_ASIC_TX_OVRD_IN_1 0x4008
#define LANEN_DIG_ASIC_TX_OVRD_IN_2 0x400c
#define PCIEPHY_RESET_BIT BIT(17)
#define PCIEPHY_PIPE_LINE0_RESET_BIT BIT(19)
#define PCIE_TXDETECT_RX_FAIL BIT(2)
#define PCIE_CLK_SOURCE BIT(8)
#define PCIE_IS_CLOCK_STABLE BIT(19)
#define PCIE_PULL_DOWN_PHY_TEST_POWERDOWN BIT(22)
#define PCIE_DEASSERT_CONTROLLER_PERST BIT(2)
#define EYEPARAM_NOCFG 0xffffffff
#define EYE_PARM0_MASK GENMASK(8, 6)
#define EYE_PARM1_MASK GENMASK(11, 8)
#define EYE_PARM2_MASK GENMASK(5, 0)
#define EYE_PARM3_MASK GENMASK(12, 7)
#define EYE_PARM4_MASK GENMASK(14, 9)
#define EYE_PARM0_EN BIT(9)
#define EYE_PARM1_EN BIT(12)
#define EYE_PARM2_EN BIT(6)
#define EYE_PARM3_EN BIT(13)
#define EYE_PARM4_EN BIT(15)
/* hi3670 pciephy register */
#define APB_PHY_START_ADDR 0x40000
#define SOC_PCIEPHY_MMC1PLL_CTRL1 0xc04
#define SOC_PCIEPHY_MMC1PLL_CTRL16 0xC40
#define SOC_PCIEPHY_MMC1PLL_CTRL17 0xC44
#define SOC_PCIEPHY_MMC1PLL_CTRL20 0xC50
#define SOC_PCIEPHY_MMC1PLL_CTRL21 0xC54
#define SOC_PCIEPHY_MMC1PLL_STAT0 0xE00
#define CRGPERIPH_PEREN12 0x470
#define CRGPERIPH_PERDIS12 0x474
#define CRGPERIPH_PCIECTRL0 0x800
#define PCIE_FNPLL_FBDIV_MASK GENMASK(27, 16)
#define PCIE_FNPLL_FRACDIV_MASK GENMASK(23, 0)
#define PCIE_FNPLL_POSTDIV1_MASK GENMASK(10, 8)
#define PCIE_FNPLL_POSTDIV2_MASK GENMASK(14, 12)
#define PCIE_FNPLL_PLL_MODE_MASK BIT(25)
#define PCIE_FNPLL_DLL_EN BIT(27)
#define PCIE_FNPLL_FBDIV 0xd0
#define PCIE_FNPLL_FRACDIV 0x555555
#define PCIE_FNPLL_POSTDIV1 0x5
#define PCIE_FNPLL_POSTDIV2 0x4
#define PCIE_FNPLL_PLL_MODE 0x0
#define PCIE_PHY_MMC1PLL 0x20
#define PCIE_PHY_CHOOSE_FNPLL BIT(27)
#define PCIE_PHY_MMC1PLL_DISABLE BIT(0)
#define PCIE_PHY_PCIEPL_BP BIT(16)
/* define ie,oe cfg */
#define IO_OE_HARD_GT_MODE BIT(1)
#define IO_IE_EN_HARD_BYPASS BIT(27)
#define IO_OE_EN_HARD_BYPASS BIT(11)
#define IO_HARD_CTRL_DEBOUNCE_BYPASS BIT(10)
#define IO_OE_GT_MODE BIT(8)
#define DEBOUNCE_WAITCFG_IN GENMASK(23, 20)
#define DEBOUNCE_WAITCFG_OUT GENMASK(16, 13)
#define IO_HP_DEBOUNCE_GT (BIT(12) | BIT(15))
#define IO_PHYREF_SOFT_GT_MODE BIT(14)
#define IO_REF_SOFT_GT_MODE BIT(13)
#define IO_REF_HARD_GT_MODE BIT(0)
/* noc power domain */
#define NOC_POWER_IDLEREQ_1 0x38c
#define NOC_POWER_IDLE_1 0x394
#define NOC_PW_MASK 0x10000
#define NOC_PW_SET_BIT 0x1
#define NUM_EYEPARAM 5
/* info located in sysctrl */
#define SCTRL_PCIE_CMOS_OFFSET 0x60
#define SCTRL_PCIE_CMOS_BIT 0x10
#define SCTRL_PCIE_ISO_OFFSET 0x44
#define SCTRL_PCIE_ISO_BIT 0x30
#define SCTRL_PCIE_HPCLK_OFFSET 0x190
#define SCTRL_PCIE_HPCLK_BIT 0x184000
#define SCTRL_PCIE_OE_OFFSET 0x14a
#define PCIE_DEBOUNCE_PARAM 0xf0f400
#define PCIE_OE_BYPASS GENMASK(29, 28)
/* peri_crg ctrl */
#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88
#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000
#define FNPLL_HAS_LOCKED BIT(4)
/* Time for delay */
#define TIME_CMOS_MIN 100
#define TIME_CMOS_MAX 105
#define PIPE_CLK_STABLE_TIME 100
#define PLL_CTRL_WAIT_TIME 200
#define NOC_POWER_TIME 100
struct hi3670_pcie_phy {
struct device *dev;
void __iomem *base;
struct regmap *apb;
struct regmap *crgctrl;
struct regmap *sysctrl;
struct regmap *pmctrl;
struct clk *apb_sys_clk;
struct clk *apb_phy_clk;
struct clk *phy_ref_clk;
struct clk *aclk;
struct clk *aux_clk;
u32 eye_param[NUM_EYEPARAM];
};
/* Registers in PCIePHY */
static inline void hi3670_apb_phy_writel(struct hi3670_pcie_phy *phy, u32 val,
u32 reg)
{
writel(val, phy->base + APB_PHY_START_ADDR + reg);
}
static inline u32 hi3670_apb_phy_readl(struct hi3670_pcie_phy *phy, u32 reg)
{
return readl(phy->base + APB_PHY_START_ADDR + reg);
}
static inline void hi3670_apb_phy_updatel(struct hi3670_pcie_phy *phy,
u32 val, u32 mask, u32 reg)
{
u32 regval;
regval = hi3670_apb_phy_readl(phy, reg);
regval &= ~mask;
regval |= val;
hi3670_apb_phy_writel(phy, regval, reg);
}
static inline void kirin_apb_natural_phy_writel(struct hi3670_pcie_phy *phy,
u32 val, u32 reg)
{
writel(val, phy->base + reg);
}
static inline u32 kirin_apb_natural_phy_readl(struct hi3670_pcie_phy *phy,
u32 reg)
{
return readl(phy->base + reg);
}
static void hi3670_pcie_phy_oe_enable(struct hi3670_pcie_phy *phy, bool enable)
{
u32 val;
regmap_read(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, &val);
val |= PCIE_DEBOUNCE_PARAM;
if (enable)
val &= ~PCIE_OE_BYPASS;
else
val |= PCIE_OE_BYPASS;
regmap_write(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val);
}
static void hi3670_pcie_get_eyeparam(struct hi3670_pcie_phy *phy)
{
struct device *dev = phy->dev;
struct device_node *np;
int ret, i;
np = dev->of_node;
ret = of_property_read_u32_array(np, "hisilicon,eye-diagram-param",
phy->eye_param, NUM_EYEPARAM);
if (!ret)
return;
/* There's no optional eye_param property. Set array to default */
for (i = 0; i < NUM_EYEPARAM; i++)
phy->eye_param[i] = EYEPARAM_NOCFG;
}
static void hi3670_pcie_set_eyeparam(struct hi3670_pcie_phy *phy)
{
u32 val;
val = kirin_apb_natural_phy_readl(phy, RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1);
if (phy->eye_param[1] != EYEPARAM_NOCFG) {
val &= ~EYE_PARM1_MASK;
val |= FIELD_PREP(EYE_PARM1_MASK, phy->eye_param[1]);
val |= EYE_PARM1_EN;
}
kirin_apb_natural_phy_writel(phy, val,
RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1);
val = kirin_apb_natural_phy_readl(phy, LANEN_DIG_ASIC_TX_OVRD_IN_2);
val &= ~(EYE_PARM2_MASK | EYE_PARM3_MASK);
if (phy->eye_param[2] != EYEPARAM_NOCFG) {
val |= FIELD_PREP(EYE_PARM2_MASK, phy->eye_param[2]);
val |= EYE_PARM2_EN;
}
if (phy->eye_param[3] != EYEPARAM_NOCFG) {
val |= FIELD_PREP(EYE_PARM3_MASK, phy->eye_param[3]);
val |= EYE_PARM3_EN;
}
kirin_apb_natural_phy_writel(phy, val, LANEN_DIG_ASIC_TX_OVRD_IN_2);
val = kirin_apb_natural_phy_readl(phy, SUP_DIG_LVL_OVRD_IN);
if (phy->eye_param[0] != EYEPARAM_NOCFG) {
val &= ~EYE_PARM0_MASK;
val |= FIELD_PREP(EYE_PARM0_MASK, phy->eye_param[0]);
val |= EYE_PARM0_EN;
}
kirin_apb_natural_phy_writel(phy, val, SUP_DIG_LVL_OVRD_IN);
val = kirin_apb_natural_phy_readl(phy, LANEN_DIG_ASIC_TX_OVRD_IN_1);
if (phy->eye_param[4] != EYEPARAM_NOCFG) {
val &= ~EYE_PARM4_MASK;
val |= FIELD_PREP(EYE_PARM4_MASK, phy->eye_param[4]);
val |= EYE_PARM4_EN;
}
kirin_apb_natural_phy_writel(phy, val, LANEN_DIG_ASIC_TX_OVRD_IN_1);
}
static void hi3670_pcie_natural_cfg(struct hi3670_pcie_phy *phy)
{
u32 val;
/* change 2p mem_ctrl */
regmap_write(phy->apb, SOC_PCIECTRL_CTRL20_ADDR,
SOC_PCIECTRL_CTRL20_2P_MEM_CTRL);
regmap_read(phy->apb, SOC_PCIECTRL_CTRL7_ADDR, &val);
val |= PCIE_PULL_UP_SYS_AUX_PWR_DET;
regmap_write(phy->apb, SOC_PCIECTRL_CTRL7_ADDR, val);
/* output, pull down */
regmap_read(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, &val);
val &= ~PCIE_OUTPUT_PULL_BITS;
val |= PCIE_OUTPUT_PULL_DOWN;
regmap_write(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, val);
/* Handle phy_reset and lane0_reset to HW */
hi3670_apb_phy_updatel(phy, PCIEPHY_RESET_BIT,
PCIEPHY_PIPE_LINE0_RESET_BIT | PCIEPHY_RESET_BIT,
SOC_PCIEPHY_CTRL1_ADDR);
/* fix chip bug: TxDetectRx fail */
hi3670_apb_phy_updatel(phy, PCIE_TXDETECT_RX_FAIL, PCIE_TXDETECT_RX_FAIL,
SOC_PCIEPHY_CTRL38_ADDR);
}
static void hi3670_pcie_pll_init(struct hi3670_pcie_phy *phy)
{
hi3670_apb_phy_updatel(phy, PCIE_PHY_CHOOSE_FNPLL, PCIE_PHY_CHOOSE_FNPLL,
SOC_PCIEPHY_MMC1PLL_CTRL1);
hi3670_apb_phy_updatel(phy,
FIELD_PREP(PCIE_FNPLL_FBDIV_MASK, PCIE_FNPLL_FBDIV),
PCIE_FNPLL_FBDIV_MASK,
SOC_PCIEPHY_MMC1PLL_CTRL16);
hi3670_apb_phy_updatel(phy,
FIELD_PREP(PCIE_FNPLL_FRACDIV_MASK, PCIE_FNPLL_FRACDIV),
PCIE_FNPLL_FRACDIV_MASK, SOC_PCIEPHY_MMC1PLL_CTRL17);
hi3670_apb_phy_updatel(phy,
PCIE_FNPLL_DLL_EN |
FIELD_PREP(PCIE_FNPLL_POSTDIV1_MASK, PCIE_FNPLL_POSTDIV1) |
FIELD_PREP(PCIE_FNPLL_POSTDIV2_MASK, PCIE_FNPLL_POSTDIV2) |
FIELD_PREP(PCIE_FNPLL_PLL_MODE_MASK, PCIE_FNPLL_PLL_MODE),
PCIE_FNPLL_POSTDIV1_MASK |
PCIE_FNPLL_POSTDIV2_MASK |
PCIE_FNPLL_PLL_MODE_MASK | PCIE_FNPLL_DLL_EN,
SOC_PCIEPHY_MMC1PLL_CTRL20);
hi3670_apb_phy_writel(phy, PCIE_PHY_MMC1PLL,
SOC_PCIEPHY_MMC1PLL_CTRL21);
}
static int hi3670_pcie_pll_ctrl(struct hi3670_pcie_phy *phy, bool enable)
{
struct device *dev = phy->dev;
u32 val;
int time = PLL_CTRL_WAIT_TIME;
if (enable) {
/* pd = 0 */
hi3670_apb_phy_updatel(phy, 0, PCIE_PHY_MMC1PLL_DISABLE,
SOC_PCIEPHY_MMC1PLL_CTRL16);
/* choose FNPLL */
val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_MMC1PLL_STAT0);
while (!(val & FNPLL_HAS_LOCKED)) {
if (!time) {
dev_err(dev, "wait for pll_lock timeout\n");
return -EINVAL;
}
time--;
udelay(1);
val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_MMC1PLL_STAT0);
}
hi3670_apb_phy_updatel(phy, 0, PCIE_PHY_PCIEPL_BP,
SOC_PCIEPHY_MMC1PLL_CTRL20);
} else {
hi3670_apb_phy_updatel(phy,
PCIE_PHY_MMC1PLL_DISABLE,
PCIE_PHY_MMC1PLL_DISABLE,
SOC_PCIEPHY_MMC1PLL_CTRL16);
hi3670_apb_phy_updatel(phy, PCIE_PHY_PCIEPL_BP,
PCIE_PHY_PCIEPL_BP,
SOC_PCIEPHY_MMC1PLL_CTRL20);
}
return 0;
}
static void hi3670_pcie_hp_debounce_gt(struct hi3670_pcie_phy *phy, bool open)
{
if (open)
/* gt_clk_pcie_hp/gt_clk_pcie_debounce open */
regmap_write(phy->crgctrl, CRGPERIPH_PEREN12,
IO_HP_DEBOUNCE_GT);
else
/* gt_clk_pcie_hp/gt_clk_pcie_debounce close */
regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
IO_HP_DEBOUNCE_GT);
}
static void hi3670_pcie_phyref_gt(struct hi3670_pcie_phy *phy, bool open)
{
unsigned int val;
regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
if (open)
val &= ~IO_OE_HARD_GT_MODE; /* enable hard gt mode */
else
val |= IO_OE_HARD_GT_MODE; /* disable hard gt mode */
regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
/* disable soft gt mode */
regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12, IO_PHYREF_SOFT_GT_MODE);
}
static void hi3670_pcie_oe_ctrl(struct hi3670_pcie_phy *phy, bool en_flag)
{
unsigned int val;
regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
/* set ie cfg */
val |= IO_IE_EN_HARD_BYPASS;
/* set oe cfg */
val &= ~IO_HARD_CTRL_DEBOUNCE_BYPASS;
/* set phy_debounce in&out time */
val |= (DEBOUNCE_WAITCFG_IN | DEBOUNCE_WAITCFG_OUT);
/* select oe_gt_mode */
val |= IO_OE_GT_MODE;
if (en_flag)
val &= ~IO_OE_EN_HARD_BYPASS;
else
val |= IO_OE_EN_HARD_BYPASS;
regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
}
static void hi3670_pcie_ioref_gt(struct hi3670_pcie_phy *phy, bool open)
{
unsigned int val;
if (open) {
regmap_write(phy->apb, SOC_PCIECTRL_CTRL21_ADDR,
SOC_PCIECTRL_CTRL21_DEFAULT);
hi3670_pcie_oe_ctrl(phy, true);
/* en hard gt mode */
regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
val &= ~IO_REF_HARD_GT_MODE;
regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
/* disable soft gt mode */
regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
IO_REF_SOFT_GT_MODE);
} else {
/* disable hard gt mode */
regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
val |= IO_REF_HARD_GT_MODE;
regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
/* disable soft gt mode */
regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
IO_REF_SOFT_GT_MODE);
hi3670_pcie_oe_ctrl(phy, false);
}
}
static int hi3670_pcie_allclk_ctrl(struct hi3670_pcie_phy *phy, bool clk_on)
{
struct device *dev = phy->dev;
int ret = 0;
if (!clk_on)
goto close_clocks;
/* choose 100MHz clk src: Bit[8]==1 pad, Bit[8]==0 pll */
hi3670_apb_phy_updatel(phy, 0, PCIE_CLK_SOURCE,
SOC_PCIEPHY_CTRL1_ADDR);
hi3670_pcie_pll_init(phy);
ret = hi3670_pcie_pll_ctrl(phy, true);
if (ret) {
dev_err(dev, "Failed to enable pll\n");
return -EINVAL;
}
hi3670_pcie_hp_debounce_gt(phy, true);
hi3670_pcie_phyref_gt(phy, true);
hi3670_pcie_ioref_gt(phy, true);
ret = clk_set_rate(phy->aclk, AXI_CLK_FREQ);
if (ret) {
dev_err(dev, "Failed to set rate\n");
goto close_clocks;
}
return 0;
close_clocks:
hi3670_pcie_ioref_gt(phy, false);
hi3670_pcie_phyref_gt(phy, false);
hi3670_pcie_hp_debounce_gt(phy, false);
hi3670_pcie_pll_ctrl(phy, false);
return ret;
}
static bool is_pipe_clk_stable(struct hi3670_pcie_phy *phy)
{
struct device *dev = phy->dev;
u32 val;
u32 time = PIPE_CLK_STABLE_TIME;
u32 pipe_clk_stable = PCIE_IS_CLOCK_STABLE;
val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_STATE0_ADDR);
while (val & pipe_clk_stable) {
mdelay(1);
if (!time) {
dev_err(dev, "PIPE clk is not stable\n");
return false;
}
time--;
val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_STATE0_ADDR);
}
return true;
}
static int hi3670_pcie_noc_power(struct hi3670_pcie_phy *phy, bool enable)
{
struct device *dev = phy->dev;
u32 time = NOC_POWER_TIME;
unsigned int val = NOC_PW_MASK;
int rst;
if (enable)
val = NOC_PW_MASK | NOC_PW_SET_BIT;
else
val = NOC_PW_MASK;
rst = enable ? 1 : 0;
regmap_write(phy->pmctrl, NOC_POWER_IDLEREQ_1, val);
time = NOC_POWER_TIME;
regmap_read(phy->pmctrl, NOC_POWER_IDLE_1, &val);
while ((val & NOC_PW_SET_BIT) != rst) {
udelay(10);
if (!time) {
dev_err(dev, "Failed to reverse noc power-status\n");
return -EINVAL;
}
time--;
regmap_read(phy->pmctrl, NOC_POWER_IDLE_1, &val);
}
return 0;
}
static int hi3670_pcie_get_resources_from_pcie(struct hi3670_pcie_phy *phy)
{
struct device_node *pcie_port;
struct device *dev = phy->dev;
struct device *pcie_dev;
pcie_port = of_get_child_by_name(dev->parent->of_node, "pcie");
if (!pcie_port) {
dev_err(dev, "no pcie node found in %s\n",
dev->parent->of_node->full_name);
return -ENODEV;
}
pcie_dev = bus_find_device_by_of_node(&platform_bus_type, pcie_port);
if (!pcie_dev) {
dev_err(dev, "Didn't find pcie device\n");
return -ENODEV;
}
/*
* We might just use NULL instead of the APB name, as the
* pcie-kirin currently registers directly just one regmap (although
* the DWC driver register other regmaps).
*
* Yet, it sounds safer to warrant that it will be accessing the
* right regmap. So, let's use the named version.
*/
phy->apb = dev_get_regmap(pcie_dev, "kirin_pcie_apb");
if (!phy->apb) {
dev_err(dev, "Failed to get APB regmap\n");
return -ENODEV;
}
return 0;
}
static int kirin_pcie_clk_ctrl(struct hi3670_pcie_phy *phy, bool enable)
{
int ret = 0;
if (!enable)
goto close_clk;
ret = clk_set_rate(phy->phy_ref_clk, REF_CLK_FREQ);
if (ret)
return ret;
ret = clk_prepare_enable(phy->phy_ref_clk);
if (ret)
return ret;
ret = clk_prepare_enable(phy->apb_sys_clk);
if (ret)
goto apb_sys_fail;
ret = clk_prepare_enable(phy->apb_phy_clk);
if (ret)
goto apb_phy_fail;
ret = clk_prepare_enable(phy->aclk);
if (ret)
goto aclk_fail;
ret = clk_prepare_enable(phy->aux_clk);
if (ret)
goto aux_clk_fail;
return 0;
close_clk:
clk_disable_unprepare(phy->aux_clk);
aux_clk_fail:
clk_disable_unprepare(phy->aclk);
aclk_fail:
clk_disable_unprepare(phy->apb_phy_clk);
apb_phy_fail:
clk_disable_unprepare(phy->apb_sys_clk);
apb_sys_fail:
clk_disable_unprepare(phy->phy_ref_clk);
return ret;
}
static int hi3670_pcie_phy_init(struct phy *generic_phy)
{
struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
int ret;
/*
* The code under hi3670_pcie_get_resources_from_pcie() need to
* access the reset-gpios and the APB registers, both from the
* pcie-kirin driver.
*
* The APB is obtained via the pcie driver's regmap
* Such kind of resource can only be obtained during the PCIe
* power_on sequence, as the code inside pcie-kirin needs to
* be already probed, as it needs to register the APB regmap.
*/
ret = hi3670_pcie_get_resources_from_pcie(phy);
if (ret)
return ret;
return 0;
}
static int hi3670_pcie_phy_power_on(struct phy *generic_phy)
{
struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
int val, ret;
/* Power supply for Host */
regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT);
usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX);
hi3670_pcie_phy_oe_enable(phy, true);
ret = kirin_pcie_clk_ctrl(phy, true);
if (ret)
return ret;
/* ISO disable, PCIeCtrl, PHY assert and clk gate clear */
regmap_write(phy->sysctrl, SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT);
regmap_write(phy->crgctrl, CRGCTRL_PCIE_ASSERT_OFFSET,
CRGCTRL_PCIE_ASSERT_BIT);
regmap_write(phy->sysctrl, SCTRL_PCIE_HPCLK_OFFSET,
SCTRL_PCIE_HPCLK_BIT);
hi3670_pcie_natural_cfg(phy);
ret = hi3670_pcie_allclk_ctrl(phy, true);
if (ret)
goto disable_clks;
/* pull down phy_test_powerdown signal */
hi3670_apb_phy_updatel(phy, 0, PCIE_PULL_DOWN_PHY_TEST_POWERDOWN,
SOC_PCIEPHY_CTRL0_ADDR);
/* deassert controller perst_n */
regmap_read(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, &val);
val |= PCIE_DEASSERT_CONTROLLER_PERST;
regmap_write(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, val);
udelay(10);
ret = is_pipe_clk_stable(phy);
if (!ret)
goto disable_clks;
hi3670_pcie_set_eyeparam(phy);
ret = hi3670_pcie_noc_power(phy, false);
if (ret)
goto disable_clks;
return 0;
disable_clks:
kirin_pcie_clk_ctrl(phy, false);
return ret;
}
static int hi3670_pcie_phy_power_off(struct phy *generic_phy)
{
struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
hi3670_pcie_phy_oe_enable(phy, false);
hi3670_pcie_allclk_ctrl(phy, false);
/* Drop power supply for Host */
regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, 0);
/*
* FIXME: The enabled clocks should be disabled here by calling
* kirin_pcie_clk_ctrl(phy, false);
* However, some clocks used at Kirin 970 should be marked as
* CLK_IS_CRITICAL at clk-hi3670 driver, as powering such clocks off
* cause an Asynchronous SError interrupt, which produces panic().
* While clk-hi3670 is not fixed, we cannot risk disabling clocks here.
*/
return 0;
}
static const struct phy_ops hi3670_phy_ops = {
.init = hi3670_pcie_phy_init,
.power_on = hi3670_pcie_phy_power_on,
.power_off = hi3670_pcie_phy_power_off,
.owner = THIS_MODULE,
};
static int hi3670_pcie_phy_get_resources(struct hi3670_pcie_phy *phy,
struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
/* syscon */
phy->crgctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-crgctrl");
if (IS_ERR(phy->crgctrl))
return PTR_ERR(phy->crgctrl);
phy->sysctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-sctrl");
if (IS_ERR(phy->sysctrl))
return PTR_ERR(phy->sysctrl);
phy->pmctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-pmctrl");
if (IS_ERR(phy->pmctrl))
return PTR_ERR(phy->pmctrl);
/* clocks */
phy->phy_ref_clk = devm_clk_get(dev, "phy_ref");
if (IS_ERR(phy->phy_ref_clk))
return PTR_ERR(phy->phy_ref_clk);
phy->aux_clk = devm_clk_get(dev, "aux");
if (IS_ERR(phy->aux_clk))
return PTR_ERR(phy->aux_clk);
phy->apb_phy_clk = devm_clk_get(dev, "apb_phy");
if (IS_ERR(phy->apb_phy_clk))
return PTR_ERR(phy->apb_phy_clk);
phy->apb_sys_clk = devm_clk_get(dev, "apb_sys");
if (IS_ERR(phy->apb_sys_clk))
return PTR_ERR(phy->apb_sys_clk);
phy->aclk = devm_clk_get(dev, "aclk");
if (IS_ERR(phy->aclk))
return PTR_ERR(phy->aclk);
/* registers */
phy->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(phy->base))
return PTR_ERR(phy->base);
hi3670_pcie_get_eyeparam(phy);
return 0;
}
static int hi3670_pcie_phy_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct device *dev = &pdev->dev;
struct hi3670_pcie_phy *phy;
struct phy *generic_phy;
int ret;
phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
if (!phy)
return -ENOMEM;
phy->dev = dev;
ret = hi3670_pcie_phy_get_resources(phy, pdev);
if (ret)
return ret;
generic_phy = devm_phy_create(dev, dev->of_node, &hi3670_phy_ops);
if (IS_ERR(generic_phy)) {
dev_err(dev, "failed to create PHY\n");
return PTR_ERR(generic_phy);
}
phy_set_drvdata(generic_phy, phy);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct of_device_id hi3670_pcie_phy_match[] = {
{
.compatible = "hisilicon,hi970-pcie-phy",
},
{},
};
static struct platform_driver hi3670_pcie_phy_driver = {
.probe = hi3670_pcie_phy_probe,
.driver = {
.of_match_table = hi3670_pcie_phy_match,
.name = "hi3670_pcie_phy",
.suppress_bind_attrs = true,
}
};
builtin_platform_driver(hi3670_pcie_phy_driver);
MODULE_DEVICE_TABLE(of, hi3670_pcie_phy_match);
MODULE_DESCRIPTION("PCIe phy driver for Kirin 970");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
MODULE_AUTHOR("Manivannan Sadhasivam <mani@kernel.org>");
MODULE_LICENSE("GPL v2");
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