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MIPS: OCTEON: octeon-usb: introduce dwc3_octeon_{read,write}q
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Move all register access code into separate functions and
provide their no-op version for non Octeon platforms.

Later it might be possible to replace them with standard
Linux functions, however datasheets are not publicly available
and I have only one Octeon board to test, so lets stay on safe
side for now.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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Ladislav Michl authored and Thomas Bogendoerfer committed Jun 23, 2023
1 parent 793bef5 commit 2257c6c
Showing 1 changed file with 59 additions and 40 deletions.
99 changes: 59 additions & 40 deletions arch/mips/cavium-octeon/octeon-usb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,6 @@
#include <linux/mutex.h>
#include <linux/of_platform.h>

#include <asm/octeon/octeon.h>

/*
* USB Control Register
*/
Expand Down Expand Up @@ -196,6 +194,17 @@
static DEFINE_MUTEX(dwc3_octeon_clocks_mutex);
static uint8_t clk_div[OCTEON_H_CLKDIV_SEL] = {1, 2, 4, 6, 8, 16, 24, 32};

#ifdef CONFIG_CAVIUM_OCTEON_SOC
#include <asm/octeon/octeon.h>
static inline uint64_t dwc3_octeon_readq(void __iomem *addr)
{
return cvmx_readq_csr(addr);
}

static inline void dwc3_octeon_writeq(void __iomem *base, uint64_t val)
{
cvmx_writeq_csr(base, val);
}

static void dwc3_octeon_config_gpio(int index, int gpio)
{
Expand All @@ -220,14 +229,24 @@ static void dwc3_octeon_config_gpio(int index, int gpio)
cvmx_write_csr(CVMX_GPIO_XBIT_CFGX(gpio), gpio_bit.u64);
}
}
#else
static inline uint64_t dwc3_octeon_readq(void __iomem *addr)
{
return 0;
}

static inline void dwc3_octeon_writeq(void __iomem *base, uint64_t val) { }

static inline void dwc3_octeon_config_gpio(int index, int gpio) { }
#endif

static int dwc3_octeon_config_power(struct device *dev, u64 base)
static int dwc3_octeon_config_power(struct device *dev, void __iomem *base)
{
uint32_t gpio_pwr[3];
int gpio, len, power_active_low;
struct device_node *node = dev->of_node;
u64 val;
u64 uctl_host_cfg_reg = base + USBDRD_UCTL_HOST_CFG;
void __iomem *uctl_host_cfg_reg = base + USBDRD_UCTL_HOST_CFG;

if (of_find_property(node, "power", &len) != NULL) {
if (len == 12) {
Expand All @@ -242,33 +261,33 @@ static int dwc3_octeon_config_power(struct device *dev, u64 base)
dev_err(dev, "invalid power configuration\n");
return -EINVAL;
}
dwc3_octeon_config_gpio((base >> 24) & 1, gpio);
dwc3_octeon_config_gpio(((u64)base >> 24) & 1, gpio);

/* Enable XHCI power control and set if active high or low. */
val = cvmx_read_csr(uctl_host_cfg_reg);
val = dwc3_octeon_readq(uctl_host_cfg_reg);
val |= USBDRD_UCTL_HOST_PPC_EN;
if (power_active_low)
val &= ~USBDRD_UCTL_HOST_PPC_ACTIVE_HIGH_EN;
else
val |= USBDRD_UCTL_HOST_PPC_ACTIVE_HIGH_EN;
cvmx_write_csr(uctl_host_cfg_reg, val);
dwc3_octeon_writeq(uctl_host_cfg_reg, val);
} else {
/* Disable XHCI power control and set if active high. */
val = cvmx_read_csr(uctl_host_cfg_reg);
val = dwc3_octeon_readq(uctl_host_cfg_reg);
val &= ~USBDRD_UCTL_HOST_PPC_EN;
val &= ~USBDRD_UCTL_HOST_PPC_ACTIVE_HIGH_EN;
cvmx_write_csr(uctl_host_cfg_reg, val);
dwc3_octeon_writeq(uctl_host_cfg_reg, val);
dev_info(dev, "power control disabled\n");
}
return 0;
}

static int dwc3_octeon_clocks_start(struct device *dev, u64 base)
static int dwc3_octeon_clocks_start(struct device *dev, void __iomem *base)
{
int i, mpll_mul, ref_clk_fsel, ref_clk_sel = 2;
u32 clock_rate;
u64 div, h_clk_rate, val;
u64 uctl_ctl_reg = base + USBDRD_UCTL_CTL;
void __iomem *uctl_ctl_reg = base + USBDRD_UCTL_CTL;

if (dev->of_node) {
const char *ss_clock_type;
Expand Down Expand Up @@ -332,16 +351,16 @@ static int dwc3_octeon_clocks_start(struct device *dev, u64 base)
/* Step 2: Select GPIO for overcurrent indication, if desired. SKIP */

/* Step 3: Assert all resets. */
val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val |= USBDRD_UCTL_CTL_UPHY_RST |
USBDRD_UCTL_CTL_UAHC_RST |
USBDRD_UCTL_CTL_UCTL_RST;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);

/* Step 4a: Reset the clock dividers. */
val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val |= USBDRD_UCTL_CTL_H_CLKDIV_RST;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);

/* Step 4b: Select controller clock frequency. */
for (div = 0; div < OCTEON_H_CLKDIV_SEL; div++) {
Expand All @@ -350,12 +369,12 @@ static int dwc3_octeon_clocks_start(struct device *dev, u64 base)
h_clk_rate >= OCTEON_MIN_H_CLK_RATE)
break;
}
val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val &= ~USBDRD_UCTL_CTL_H_CLKDIV_SEL;
val |= FIELD_PREP(USBDRD_UCTL_CTL_H_CLKDIV_SEL, div);
val |= USBDRD_UCTL_CTL_H_CLK_EN;
cvmx_write_csr(uctl_ctl_reg, val);
val = cvmx_read_csr(uctl_ctl_reg);
dwc3_octeon_writeq(uctl_ctl_reg, val);
val = dwc3_octeon_readq(uctl_ctl_reg);
if ((div != FIELD_GET(USBDRD_UCTL_CTL_H_CLKDIV_SEL, val)) ||
(!(FIELD_GET(USBDRD_UCTL_CTL_H_CLK_EN, val)))) {
dev_err(dev, "dwc3 controller clock init failure.\n");
Expand All @@ -364,10 +383,10 @@ static int dwc3_octeon_clocks_start(struct device *dev, u64 base)

/* Step 4c: Deassert the controller clock divider reset. */
val &= ~USBDRD_UCTL_CTL_H_CLKDIV_RST;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);

/* Step 5a: Reference clock configuration. */
val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val &= ~USBDRD_UCTL_CTL_REF_CLK_DIV2;
val &= ~USBDRD_UCTL_CTL_REF_CLK_SEL;
val |= FIELD_PREP(USBDRD_UCTL_CTL_REF_CLK_SEL, ref_clk_sel);
Expand Down Expand Up @@ -407,15 +426,15 @@ static int dwc3_octeon_clocks_start(struct device *dev, u64 base)
/* Step 6a & 6b: Power up PHYs. */
val |= USBDRD_UCTL_CTL_HS_POWER_EN;
val |= USBDRD_UCTL_CTL_SS_POWER_EN;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);

/* Step 7: Wait 10 controller-clock cycles to take effect. */
udelay(10);

/* Step 8a: Deassert UCTL reset signal. */
val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val &= ~USBDRD_UCTL_CTL_UCTL_RST;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);

/* Step 8b: Wait 10 controller-clock cycles. */
udelay(10);
Expand All @@ -425,49 +444,49 @@ static int dwc3_octeon_clocks_start(struct device *dev, u64 base)
return -EINVAL;

/* Step 8d: Deassert UAHC reset signal. */
val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val &= ~USBDRD_UCTL_CTL_UAHC_RST;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);

/* Step 8e: Wait 10 controller-clock cycles. */
udelay(10);

/* Step 9: Enable conditional coprocessor clock of UCTL. */
val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val |= USBDRD_UCTL_CTL_CSCLK_EN;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);

/*Step 10: Set for host mode only. */
val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val &= ~USBDRD_UCTL_CTL_DRD_MODE;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);

return 0;
}

static void __init dwc3_octeon_set_endian_mode(u64 base)
static void __init dwc3_octeon_set_endian_mode(void __iomem *base)
{
u64 val;
u64 uctl_shim_cfg_reg = base + USBDRD_UCTL_SHIM_CFG;
void __iomem *uctl_shim_cfg_reg = base + USBDRD_UCTL_SHIM_CFG;

val = cvmx_read_csr(uctl_shim_cfg_reg);
val = dwc3_octeon_readq(uctl_shim_cfg_reg);
val &= ~USBDRD_UCTL_SHIM_CFG_DMA_ENDIAN_MODE;
val &= ~USBDRD_UCTL_SHIM_CFG_CSR_ENDIAN_MODE;
#ifdef __BIG_ENDIAN
val |= FIELD_PREP(USBDRD_UCTL_SHIM_CFG_DMA_ENDIAN_MODE, 1);
val |= FIELD_PREP(USBDRD_UCTL_SHIM_CFG_CSR_ENDIAN_MODE, 1);
#endif
cvmx_write_csr(uctl_shim_cfg_reg, val);
dwc3_octeon_writeq(uctl_shim_cfg_reg, val);
}

static void __init dwc3_octeon_phy_reset(u64 base)
static void __init dwc3_octeon_phy_reset(void __iomem *base)
{
u64 val;
u64 uctl_ctl_reg = base + USBDRD_UCTL_CTL;
void __iomem *uctl_ctl_reg = base + USBDRD_UCTL_CTL;

val = cvmx_read_csr(uctl_ctl_reg);
val = dwc3_octeon_readq(uctl_ctl_reg);
val &= ~USBDRD_UCTL_CTL_UPHY_RST;
cvmx_write_csr(uctl_ctl_reg, val);
dwc3_octeon_writeq(uctl_ctl_reg, val);
}

static int __init dwc3_octeon_device_init(void)
Expand Down Expand Up @@ -506,10 +525,10 @@ static int __init dwc3_octeon_device_init(void)
}

mutex_lock(&dwc3_octeon_clocks_mutex);
if (dwc3_octeon_clocks_start(&pdev->dev, (u64)base) == 0)
if (dwc3_octeon_clocks_start(&pdev->dev, base) == 0)
dev_info(&pdev->dev, "clocks initialized.\n");
dwc3_octeon_set_endian_mode((u64)base);
dwc3_octeon_phy_reset((u64)base);
dwc3_octeon_set_endian_mode(base);
dwc3_octeon_phy_reset(base);
mutex_unlock(&dwc3_octeon_clocks_mutex);
devm_iounmap(&pdev->dev, base);
devm_release_mem_region(&pdev->dev, res->start,
Expand Down

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