diff options
Diffstat (limited to 'arch/mips/cavium-octeon/octeon-platform.c')
| -rw-r--r-- | arch/mips/cavium-octeon/octeon-platform.c | 274 |
1 files changed, 272 insertions, 2 deletions
diff --git a/arch/mips/cavium-octeon/octeon-platform.c b/arch/mips/cavium-octeon/octeon-platform.c index 6df0f4d8f197..b67ddf0f8bcd 100644 --- a/arch/mips/cavium-octeon/octeon-platform.c +++ b/arch/mips/cavium-octeon/octeon-platform.c @@ -7,22 +7,27 @@ * Copyright (C) 2008 Wind River Systems */ +#include <linux/delay.h> #include <linux/init.h> #include <linux/irq.h> #include <linux/i2c.h> #include <linux/usb.h> #include <linux/dma-mapping.h> #include <linux/module.h> +#include <linux/mutex.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/of_platform.h> #include <linux/of_fdt.h> #include <linux/libfdt.h> +#include <linux/usb/ehci_pdriver.h> +#include <linux/usb/ohci_pdriver.h> #include <asm/octeon/octeon.h> #include <asm/octeon/cvmx-rnm-defs.h> #include <asm/octeon/cvmx-helper.h> #include <asm/octeon/cvmx-helper-board.h> +#include <asm/octeon/cvmx-uctlx-defs.h> /* Octeon Random Number Generator. */ static int __init octeon_rng_device_init(void) @@ -68,6 +73,229 @@ device_initcall(octeon_rng_device_init); #ifdef CONFIG_USB +static DEFINE_MUTEX(octeon2_usb_clocks_mutex); + +static int octeon2_usb_clock_start_cnt; + +static void octeon2_usb_clocks_start(void) +{ + u64 div; + union cvmx_uctlx_if_ena if_ena; + union cvmx_uctlx_clk_rst_ctl clk_rst_ctl; + union cvmx_uctlx_uphy_ctl_status uphy_ctl_status; + union cvmx_uctlx_uphy_portx_ctl_status port_ctl_status; + int i; + unsigned long io_clk_64_to_ns; + + + mutex_lock(&octeon2_usb_clocks_mutex); + + octeon2_usb_clock_start_cnt++; + if (octeon2_usb_clock_start_cnt != 1) + goto exit; + + io_clk_64_to_ns = 64000000000ull / octeon_get_io_clock_rate(); + + /* + * Step 1: Wait for voltages stable. That surely happened + * before starting the kernel. + * + * Step 2: Enable SCLK of UCTL by writing UCTL0_IF_ENA[EN] = 1 + */ + if_ena.u64 = 0; + if_ena.s.en = 1; + cvmx_write_csr(CVMX_UCTLX_IF_ENA(0), if_ena.u64); + + /* Step 3: Configure the reference clock, PHY, and HCLK */ + clk_rst_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_CLK_RST_CTL(0)); + + /* + * If the UCTL looks like it has already been started, skip + * the initialization, otherwise bus errors are obtained. + */ + if (clk_rst_ctl.s.hrst) + goto end_clock; + /* 3a */ + clk_rst_ctl.s.p_por = 1; + clk_rst_ctl.s.hrst = 0; + clk_rst_ctl.s.p_prst = 0; + clk_rst_ctl.s.h_clkdiv_rst = 0; + clk_rst_ctl.s.o_clkdiv_rst = 0; + clk_rst_ctl.s.h_clkdiv_en = 0; + clk_rst_ctl.s.o_clkdiv_en = 0; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + + /* 3b */ + /* 12MHz crystal. */ + clk_rst_ctl.s.p_refclk_sel = 0; + clk_rst_ctl.s.p_refclk_div = 0; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + + /* 3c */ + div = octeon_get_io_clock_rate() / 130000000ull; + + switch (div) { + case 0: + div = 1; + break; + case 1: + case 2: + case 3: + case 4: + break; + case 5: + div = 4; + break; + case 6: + case 7: + div = 6; + break; + case 8: + case 9: + case 10: + case 11: + div = 8; + break; + default: + div = 12; + break; + } + clk_rst_ctl.s.h_div = div; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + /* Read it back, */ + clk_rst_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_CLK_RST_CTL(0)); + clk_rst_ctl.s.h_clkdiv_en = 1; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + /* 3d */ + clk_rst_ctl.s.h_clkdiv_rst = 1; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + + /* 3e: delay 64 io clocks */ + ndelay(io_clk_64_to_ns); + + /* + * Step 4: Program the power-on reset field in the UCTL + * clock-reset-control register. + */ + clk_rst_ctl.s.p_por = 0; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + + /* Step 5: Wait 1 ms for the PHY clock to start. */ + mdelay(1); + + /* + * Step 6: Program the reset input from automatic test + * equipment field in the UPHY CSR + */ + uphy_ctl_status.u64 = cvmx_read_csr(CVMX_UCTLX_UPHY_CTL_STATUS(0)); + uphy_ctl_status.s.ate_reset = 1; + cvmx_write_csr(CVMX_UCTLX_UPHY_CTL_STATUS(0), uphy_ctl_status.u64); + + /* Step 7: Wait for at least 10ns. */ + ndelay(10); + + /* Step 8: Clear the ATE_RESET field in the UPHY CSR. */ + uphy_ctl_status.s.ate_reset = 0; + cvmx_write_csr(CVMX_UCTLX_UPHY_CTL_STATUS(0), uphy_ctl_status.u64); + + /* + * Step 9: Wait for at least 20ns for UPHY to output PHY clock + * signals and OHCI_CLK48 + */ + ndelay(20); + + /* Step 10: Configure the OHCI_CLK48 and OHCI_CLK12 clocks. */ + /* 10a */ + clk_rst_ctl.s.o_clkdiv_rst = 1; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + + /* 10b */ + clk_rst_ctl.s.o_clkdiv_en = 1; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + + /* 10c */ + ndelay(io_clk_64_to_ns); + + /* + * Step 11: Program the PHY reset field: + * UCTL0_CLK_RST_CTL[P_PRST] = 1 + */ + clk_rst_ctl.s.p_prst = 1; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + + /* Step 12: Wait 1 uS. */ + udelay(1); + + /* Step 13: Program the HRESET_N field: UCTL0_CLK_RST_CTL[HRST] = 1 */ + clk_rst_ctl.s.hrst = 1; + cvmx_write_csr(CVMX_UCTLX_CLK_RST_CTL(0), clk_rst_ctl.u64); + +end_clock: + /* Now we can set some other registers. */ + + for (i = 0; i <= 1; i++) { + port_ctl_status.u64 = + cvmx_read_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0)); + /* Set txvreftune to 15 to obtain compliant 'eye' diagram. */ + port_ctl_status.s.txvreftune = 15; + port_ctl_status.s.txrisetune = 1; + port_ctl_status.s.txpreemphasistune = 1; + cvmx_write_csr(CVMX_UCTLX_UPHY_PORTX_CTL_STATUS(i, 0), + port_ctl_status.u64); + } + + /* Set uSOF cycle period to 60,000 bits. */ + cvmx_write_csr(CVMX_UCTLX_EHCI_FLA(0), 0x20ull); +exit: + mutex_unlock(&octeon2_usb_clocks_mutex); +} + +static void octeon2_usb_clocks_stop(void) +{ + mutex_lock(&octeon2_usb_clocks_mutex); + octeon2_usb_clock_start_cnt--; + mutex_unlock(&octeon2_usb_clocks_mutex); +} + +static int octeon_ehci_power_on(struct platform_device *pdev) +{ + octeon2_usb_clocks_start(); + return 0; +} + +static void octeon_ehci_power_off(struct platform_device *pdev) +{ + octeon2_usb_clocks_stop(); +} + +static struct usb_ehci_pdata octeon_ehci_pdata = { + /* Octeon EHCI matches CPU endianness. */ +#ifdef __BIG_ENDIAN + .big_endian_mmio = 1, +#endif + .power_on = octeon_ehci_power_on, + .power_off = octeon_ehci_power_off, +}; + +static void __init octeon_ehci_hw_start(void) +{ + union cvmx_uctlx_ehci_ctl ehci_ctl; + + octeon2_usb_clocks_start(); + + ehci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_EHCI_CTL(0)); + /* Use 64-bit addressing. */ + ehci_ctl.s.ehci_64b_addr_en = 1; + ehci_ctl.s.l2c_addr_msb = 0; + ehci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */ + ehci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */ + cvmx_write_csr(CVMX_UCTLX_EHCI_CTL(0), ehci_ctl.u64); + + octeon2_usb_clocks_stop(); +} + +static u64 octeon_ehci_dma_mask = DMA_BIT_MASK(64); + static int __init octeon_ehci_device_init(void) { struct platform_device *pd; @@ -88,7 +316,7 @@ static int __init octeon_ehci_device_init(void) if (octeon_is_simulation() || usb_disabled()) return 0; /* No USB in the simulator. */ - pd = platform_device_alloc("octeon-ehci", 0); + pd = platform_device_alloc("ehci-platform", 0); if (!pd) { ret = -ENOMEM; goto out; @@ -105,6 +333,10 @@ static int __init octeon_ehci_device_init(void) if (ret) goto fail; + pd->dev.dma_mask = &octeon_ehci_dma_mask; + pd->dev.platform_data = &octeon_ehci_pdata; + octeon_ehci_hw_start(); + ret = platform_device_add(pd); if (ret) goto fail; @@ -117,6 +349,41 @@ out: } device_initcall(octeon_ehci_device_init); +static int octeon_ohci_power_on(struct platform_device *pdev) +{ + octeon2_usb_clocks_start(); + return 0; +} + +static void octeon_ohci_power_off(struct platform_device *pdev) +{ + octeon2_usb_clocks_stop(); +} + +static struct usb_ohci_pdata octeon_ohci_pdata = { + /* Octeon OHCI matches CPU endianness. */ +#ifdef __BIG_ENDIAN + .big_endian_mmio = 1, +#endif + .power_on = octeon_ohci_power_on, + .power_off = octeon_ohci_power_off, +}; + +static void __init octeon_ohci_hw_start(void) +{ + union cvmx_uctlx_ohci_ctl ohci_ctl; + + octeon2_usb_clocks_start(); + + ohci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_OHCI_CTL(0)); + ohci_ctl.s.l2c_addr_msb = 0; + ohci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */ + ohci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */ + cvmx_write_csr(CVMX_UCTLX_OHCI_CTL(0), ohci_ctl.u64); + + octeon2_usb_clocks_stop(); +} + static int __init octeon_ohci_device_init(void) { struct platform_device *pd; @@ -137,7 +404,7 @@ static int __init octeon_ohci_device_init(void) if (octeon_is_simulation() || usb_disabled()) return 0; /* No USB in the simulator. */ - pd = platform_device_alloc("octeon-ohci", 0); + pd = platform_device_alloc("ohci-platform", 0); if (!pd) { ret = -ENOMEM; goto out; @@ -154,6 +421,9 @@ static int __init octeon_ohci_device_init(void) if (ret) goto fail; + pd->dev.platform_data = &octeon_ohci_pdata; + octeon_ohci_hw_start(); + ret = platform_device_add(pd); if (ret) goto fail; |