diff options
Diffstat (limited to 'kernel/arch/arm/mach-mxs/mach-mxs.c')
| -rw-r--r-- | kernel/arch/arm/mach-mxs/mach-mxs.c | 543 |
1 files changed, 543 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-mxs/mach-mxs.c b/kernel/arch/arm/mach-mxs/mach-mxs.c new file mode 100644 index 000000000..2e7cec86e --- /dev/null +++ b/kernel/arch/arm/mach-mxs/mach-mxs.c @@ -0,0 +1,543 @@ +/* + * Copyright 2012 Freescale Semiconductor, Inc. + * Copyright 2012 Linaro Ltd. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/clk.h> +#include <linux/clk/mxs.h> +#include <linux/clkdev.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/init.h> +#include <linux/irqchip/mxs.h> +#include <linux/reboot.h> +#include <linux/micrel_phy.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/phy.h> +#include <linux/pinctrl/consumer.h> +#include <linux/sys_soc.h> +#include <asm/mach/arch.h> +#include <asm/mach/map.h> +#include <asm/mach/time.h> +#include <asm/system_misc.h> + +#include "pm.h" + +/* MXS DIGCTL SAIF CLKMUX */ +#define MXS_DIGCTL_SAIF_CLKMUX_DIRECT 0x0 +#define MXS_DIGCTL_SAIF_CLKMUX_CROSSINPUT 0x1 +#define MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0 0x2 +#define MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR1 0x3 + +#define HW_DIGCTL_CHIPID 0x310 +#define HW_DIGCTL_CHIPID_MASK (0xffff << 16) +#define HW_DIGCTL_REV_MASK 0xff +#define HW_DIGCTL_CHIPID_MX23 (0x3780 << 16) +#define HW_DIGCTL_CHIPID_MX28 (0x2800 << 16) + +#define MXS_CHIP_REVISION_1_0 0x10 +#define MXS_CHIP_REVISION_1_1 0x11 +#define MXS_CHIP_REVISION_1_2 0x12 +#define MXS_CHIP_REVISION_1_3 0x13 +#define MXS_CHIP_REVISION_1_4 0x14 +#define MXS_CHIP_REV_UNKNOWN 0xff + +#define MXS_GPIO_NR(bank, nr) ((bank) * 32 + (nr)) + +#define MXS_SET_ADDR 0x4 +#define MXS_CLR_ADDR 0x8 +#define MXS_TOG_ADDR 0xc + +static u32 chipid; +static u32 socid; + +static void __iomem *reset_addr; + +static inline void __mxs_setl(u32 mask, void __iomem *reg) +{ + __raw_writel(mask, reg + MXS_SET_ADDR); +} + +static inline void __mxs_clrl(u32 mask, void __iomem *reg) +{ + __raw_writel(mask, reg + MXS_CLR_ADDR); +} + +static inline void __mxs_togl(u32 mask, void __iomem *reg) +{ + __raw_writel(mask, reg + MXS_TOG_ADDR); +} + +#define OCOTP_WORD_OFFSET 0x20 +#define OCOTP_WORD_COUNT 0x20 + +#define BM_OCOTP_CTRL_BUSY (1 << 8) +#define BM_OCOTP_CTRL_ERROR (1 << 9) +#define BM_OCOTP_CTRL_RD_BANK_OPEN (1 << 12) + +static DEFINE_MUTEX(ocotp_mutex); +static u32 ocotp_words[OCOTP_WORD_COUNT]; + +static const u32 *mxs_get_ocotp(void) +{ + struct device_node *np; + void __iomem *ocotp_base; + int timeout = 0x400; + size_t i; + static int once; + + if (once) + return ocotp_words; + + np = of_find_compatible_node(NULL, NULL, "fsl,ocotp"); + ocotp_base = of_iomap(np, 0); + WARN_ON(!ocotp_base); + + mutex_lock(&ocotp_mutex); + + /* + * clk_enable(hbus_clk) for ocotp can be skipped + * as it must be on when system is running. + */ + + /* try to clear ERROR bit */ + __mxs_clrl(BM_OCOTP_CTRL_ERROR, ocotp_base); + + /* check both BUSY and ERROR cleared */ + while ((__raw_readl(ocotp_base) & + (BM_OCOTP_CTRL_BUSY | BM_OCOTP_CTRL_ERROR)) && --timeout) + cpu_relax(); + + if (unlikely(!timeout)) + goto error_unlock; + + /* open OCOTP banks for read */ + __mxs_setl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base); + + /* approximately wait 32 hclk cycles */ + udelay(1); + + /* poll BUSY bit becoming cleared */ + timeout = 0x400; + while ((__raw_readl(ocotp_base) & BM_OCOTP_CTRL_BUSY) && --timeout) + cpu_relax(); + + if (unlikely(!timeout)) + goto error_unlock; + + for (i = 0; i < OCOTP_WORD_COUNT; i++) + ocotp_words[i] = __raw_readl(ocotp_base + OCOTP_WORD_OFFSET + + i * 0x10); + + /* close banks for power saving */ + __mxs_clrl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base); + + once = 1; + + mutex_unlock(&ocotp_mutex); + + return ocotp_words; + +error_unlock: + mutex_unlock(&ocotp_mutex); + pr_err("%s: timeout in reading OCOTP\n", __func__); + return NULL; +} + +enum mac_oui { + OUI_FSL, + OUI_DENX, + OUI_CRYSTALFONTZ, + OUI_I2SE, + OUI_ARMADEUS, +}; + +static void __init update_fec_mac_prop(enum mac_oui oui) +{ + struct device_node *np, *from = NULL; + struct property *newmac; + const u32 *ocotp = mxs_get_ocotp(); + u8 *macaddr; + u32 val; + int i; + + for (i = 0; i < 2; i++) { + np = of_find_compatible_node(from, NULL, "fsl,imx28-fec"); + if (!np) + return; + + from = np; + + if (of_get_property(np, "local-mac-address", NULL)) + continue; + + newmac = kzalloc(sizeof(*newmac) + 6, GFP_KERNEL); + if (!newmac) + return; + newmac->value = newmac + 1; + newmac->length = 6; + + newmac->name = kstrdup("local-mac-address", GFP_KERNEL); + if (!newmac->name) { + kfree(newmac); + return; + } + + /* + * OCOTP only stores the last 4 octets for each mac address, + * so hard-code OUI here. + */ + macaddr = newmac->value; + switch (oui) { + case OUI_FSL: + macaddr[0] = 0x00; + macaddr[1] = 0x04; + macaddr[2] = 0x9f; + break; + case OUI_DENX: + macaddr[0] = 0xc0; + macaddr[1] = 0xe5; + macaddr[2] = 0x4e; + break; + case OUI_CRYSTALFONTZ: + macaddr[0] = 0x58; + macaddr[1] = 0xb9; + macaddr[2] = 0xe1; + break; + case OUI_I2SE: + macaddr[0] = 0x00; + macaddr[1] = 0x01; + macaddr[2] = 0x87; + break; + case OUI_ARMADEUS: + macaddr[0] = 0x00; + macaddr[1] = 0x1e; + macaddr[2] = 0xac; + break; + } + val = ocotp[i]; + macaddr[3] = (val >> 16) & 0xff; + macaddr[4] = (val >> 8) & 0xff; + macaddr[5] = (val >> 0) & 0xff; + + of_update_property(np, newmac); + } +} + +static inline void enable_clk_enet_out(void) +{ + struct clk *clk = clk_get_sys("enet_out", NULL); + + if (!IS_ERR(clk)) + clk_prepare_enable(clk); +} + +static void __init imx28_evk_init(void) +{ + update_fec_mac_prop(OUI_FSL); + + mxs_saif_clkmux_select(MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0); +} + +static void __init imx28_apf28_init(void) +{ + update_fec_mac_prop(OUI_ARMADEUS); +} + +static int apx4devkit_phy_fixup(struct phy_device *phy) +{ + phy->dev_flags |= MICREL_PHY_50MHZ_CLK; + return 0; +} + +static void __init apx4devkit_init(void) +{ + enable_clk_enet_out(); + + if (IS_BUILTIN(CONFIG_PHYLIB)) + phy_register_fixup_for_uid(PHY_ID_KSZ8051, MICREL_PHY_ID_MASK, + apx4devkit_phy_fixup); +} + +#define ENET0_MDC__GPIO_4_0 MXS_GPIO_NR(4, 0) +#define ENET0_MDIO__GPIO_4_1 MXS_GPIO_NR(4, 1) +#define ENET0_RX_EN__GPIO_4_2 MXS_GPIO_NR(4, 2) +#define ENET0_RXD0__GPIO_4_3 MXS_GPIO_NR(4, 3) +#define ENET0_RXD1__GPIO_4_4 MXS_GPIO_NR(4, 4) +#define ENET0_TX_EN__GPIO_4_6 MXS_GPIO_NR(4, 6) +#define ENET0_TXD0__GPIO_4_7 MXS_GPIO_NR(4, 7) +#define ENET0_TXD1__GPIO_4_8 MXS_GPIO_NR(4, 8) +#define ENET_CLK__GPIO_4_16 MXS_GPIO_NR(4, 16) + +#define TX28_FEC_PHY_POWER MXS_GPIO_NR(3, 29) +#define TX28_FEC_PHY_RESET MXS_GPIO_NR(4, 13) +#define TX28_FEC_nINT MXS_GPIO_NR(4, 5) + +static const struct gpio tx28_gpios[] __initconst = { + { ENET0_MDC__GPIO_4_0, GPIOF_OUT_INIT_LOW, "GPIO_4_0" }, + { ENET0_MDIO__GPIO_4_1, GPIOF_OUT_INIT_LOW, "GPIO_4_1" }, + { ENET0_RX_EN__GPIO_4_2, GPIOF_OUT_INIT_LOW, "GPIO_4_2" }, + { ENET0_RXD0__GPIO_4_3, GPIOF_OUT_INIT_LOW, "GPIO_4_3" }, + { ENET0_RXD1__GPIO_4_4, GPIOF_OUT_INIT_LOW, "GPIO_4_4" }, + { ENET0_TX_EN__GPIO_4_6, GPIOF_OUT_INIT_LOW, "GPIO_4_6" }, + { ENET0_TXD0__GPIO_4_7, GPIOF_OUT_INIT_LOW, "GPIO_4_7" }, + { ENET0_TXD1__GPIO_4_8, GPIOF_OUT_INIT_LOW, "GPIO_4_8" }, + { ENET_CLK__GPIO_4_16, GPIOF_OUT_INIT_LOW, "GPIO_4_16" }, + { TX28_FEC_PHY_POWER, GPIOF_OUT_INIT_LOW, "fec-phy-power" }, + { TX28_FEC_PHY_RESET, GPIOF_OUT_INIT_LOW, "fec-phy-reset" }, + { TX28_FEC_nINT, GPIOF_DIR_IN, "fec-int" }, +}; + +static void __init tx28_post_init(void) +{ + struct device_node *np; + struct platform_device *pdev; + struct pinctrl *pctl; + int ret; + + enable_clk_enet_out(); + + np = of_find_compatible_node(NULL, NULL, "fsl,imx28-fec"); + pdev = of_find_device_by_node(np); + if (!pdev) { + pr_err("%s: failed to find fec device\n", __func__); + return; + } + + pctl = pinctrl_get_select(&pdev->dev, "gpio_mode"); + if (IS_ERR(pctl)) { + pr_err("%s: failed to get pinctrl state\n", __func__); + return; + } + + ret = gpio_request_array(tx28_gpios, ARRAY_SIZE(tx28_gpios)); + if (ret) { + pr_err("%s: failed to request gpios: %d\n", __func__, ret); + return; + } + + /* Power up fec phy */ + gpio_set_value(TX28_FEC_PHY_POWER, 1); + msleep(26); /* 25ms according to data sheet */ + + /* Mode strap pins */ + gpio_set_value(ENET0_RX_EN__GPIO_4_2, 1); + gpio_set_value(ENET0_RXD0__GPIO_4_3, 1); + gpio_set_value(ENET0_RXD1__GPIO_4_4, 1); + + udelay(100); /* minimum assertion time for nRST */ + + /* Deasserting FEC PHY RESET */ + gpio_set_value(TX28_FEC_PHY_RESET, 1); + + pinctrl_put(pctl); +} + +static void __init crystalfontz_init(void) +{ + update_fec_mac_prop(OUI_CRYSTALFONTZ); +} + +static void __init duckbill_init(void) +{ + update_fec_mac_prop(OUI_I2SE); +} + +static void __init m28cu3_init(void) +{ + update_fec_mac_prop(OUI_DENX); +} + +static const char __init *mxs_get_soc_id(void) +{ + struct device_node *np; + void __iomem *digctl_base; + + np = of_find_compatible_node(NULL, NULL, "fsl,imx23-digctl"); + digctl_base = of_iomap(np, 0); + WARN_ON(!digctl_base); + + chipid = readl(digctl_base + HW_DIGCTL_CHIPID); + socid = chipid & HW_DIGCTL_CHIPID_MASK; + + iounmap(digctl_base); + of_node_put(np); + + switch (socid) { + case HW_DIGCTL_CHIPID_MX23: + return "i.MX23"; + case HW_DIGCTL_CHIPID_MX28: + return "i.MX28"; + default: + return "Unknown"; + } +} + +static u32 __init mxs_get_cpu_rev(void) +{ + u32 rev = chipid & HW_DIGCTL_REV_MASK; + + switch (socid) { + case HW_DIGCTL_CHIPID_MX23: + switch (rev) { + case 0x0: + return MXS_CHIP_REVISION_1_0; + case 0x1: + return MXS_CHIP_REVISION_1_1; + case 0x2: + return MXS_CHIP_REVISION_1_2; + case 0x3: + return MXS_CHIP_REVISION_1_3; + case 0x4: + return MXS_CHIP_REVISION_1_4; + default: + return MXS_CHIP_REV_UNKNOWN; + } + case HW_DIGCTL_CHIPID_MX28: + switch (rev) { + case 0x0: + return MXS_CHIP_REVISION_1_1; + case 0x1: + return MXS_CHIP_REVISION_1_2; + default: + return MXS_CHIP_REV_UNKNOWN; + } + default: + return MXS_CHIP_REV_UNKNOWN; + } +} + +static const char __init *mxs_get_revision(void) +{ + u32 rev = mxs_get_cpu_rev(); + + if (rev != MXS_CHIP_REV_UNKNOWN) + return kasprintf(GFP_KERNEL, "%d.%d", (rev >> 4) & 0xf, + rev & 0xf); + else + return kasprintf(GFP_KERNEL, "%s", "Unknown"); +} + +#define MX23_CLKCTRL_RESET_OFFSET 0x120 +#define MX28_CLKCTRL_RESET_OFFSET 0x1e0 + +static int __init mxs_restart_init(void) +{ + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "fsl,clkctrl"); + reset_addr = of_iomap(np, 0); + if (!reset_addr) + return -ENODEV; + + if (of_device_is_compatible(np, "fsl,imx23-clkctrl")) + reset_addr += MX23_CLKCTRL_RESET_OFFSET; + else + reset_addr += MX28_CLKCTRL_RESET_OFFSET; + of_node_put(np); + + return 0; +} + +static void __init eukrea_mbmx283lc_init(void) +{ + mxs_saif_clkmux_select(MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0); +} + +static void __init mxs_machine_init(void) +{ + struct device_node *root; + struct device *parent; + struct soc_device *soc_dev; + struct soc_device_attribute *soc_dev_attr; + int ret; + + soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); + if (!soc_dev_attr) + return; + + root = of_find_node_by_path("/"); + ret = of_property_read_string(root, "model", &soc_dev_attr->machine); + if (ret) + return; + + soc_dev_attr->family = "Freescale MXS Family"; + soc_dev_attr->soc_id = mxs_get_soc_id(); + soc_dev_attr->revision = mxs_get_revision(); + + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) { + kfree(soc_dev_attr->revision); + kfree(soc_dev_attr); + return; + } + + parent = soc_device_to_device(soc_dev); + + if (of_machine_is_compatible("fsl,imx28-evk")) + imx28_evk_init(); + if (of_machine_is_compatible("armadeus,imx28-apf28")) + imx28_apf28_init(); + else if (of_machine_is_compatible("bluegiga,apx4devkit")) + apx4devkit_init(); + else if (of_machine_is_compatible("crystalfontz,cfa10036")) + crystalfontz_init(); + else if (of_machine_is_compatible("eukrea,mbmx283lc")) + eukrea_mbmx283lc_init(); + else if (of_machine_is_compatible("i2se,duckbill")) + duckbill_init(); + else if (of_machine_is_compatible("msr,m28cu3")) + m28cu3_init(); + + of_platform_populate(NULL, of_default_bus_match_table, + NULL, parent); + + mxs_restart_init(); + + if (of_machine_is_compatible("karo,tx28")) + tx28_post_init(); +} + +#define MXS_CLKCTRL_RESET_CHIP (1 << 1) + +/* + * Reset the system. It is called by machine_restart(). + */ +static void mxs_restart(enum reboot_mode mode, const char *cmd) +{ + if (reset_addr) { + /* reset the chip */ + __mxs_setl(MXS_CLKCTRL_RESET_CHIP, reset_addr); + + pr_err("Failed to assert the chip reset\n"); + + /* Delay to allow the serial port to show the message */ + mdelay(50); + } + + /* We'll take a jump through zero as a poor second */ + soft_restart(0); +} + +static const char *mxs_dt_compat[] __initdata = { + "fsl,imx28", + "fsl,imx23", + NULL, +}; + +DT_MACHINE_START(MXS, "Freescale MXS (Device Tree)") + .handle_irq = icoll_handle_irq, + .init_machine = mxs_machine_init, + .init_late = mxs_pm_init, + .dt_compat = mxs_dt_compat, + .restart = mxs_restart, +MACHINE_END |