diff options
Diffstat (limited to 'target/linux/lantiq/files/arch/mips/lantiq/falcon/sysctrl.c')
| -rw-r--r-- | target/linux/lantiq/files/arch/mips/lantiq/falcon/sysctrl.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/target/linux/lantiq/files/arch/mips/lantiq/falcon/sysctrl.c b/target/linux/lantiq/files/arch/mips/lantiq/falcon/sysctrl.c new file mode 100644 index 000000000..f27d69482 --- /dev/null +++ b/target/linux/lantiq/files/arch/mips/lantiq/falcon/sysctrl.c @@ -0,0 +1,211 @@ +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Copyright (C) 2011 Thomas Langer <thomas.langer@lantiq.com> + * Copyright (C) 2011 John Crispin <blogic@openwrt.org> + */ + +#include <linux/ioport.h> +#include <linux/export.h> +#include <linux/clkdev.h> +#include <asm/delay.h> + +#include <lantiq_soc.h> + +#include "devices.h" +#include "../clk.h" + +/* infrastructure control register */ +#define SYS1_INFRAC 0x00bc +/* Configuration fuses for drivers and pll */ +#define STATUS_CONFIG 0x0040 + +/* GPE frequency selection */ +#define GPPC_OFFSET 24 +#define GPEFREQ_MASK 0x00000C0 +#define GPEFREQ_OFFSET 10 +/* Clock status register */ +#define LTQ_SYSCTL_CLKS 0x0000 +/* Clock enable register */ +#define LTQ_SYSCTL_CLKEN 0x0004 +/* Clock clear register */ +#define LTQ_SYSCTL_CLKCLR 0x0008 +/* Activation Status Register */ +#define LTQ_SYSCTL_ACTS 0x0020 +/* Activation Register */ +#define LTQ_SYSCTL_ACT 0x0024 +/* Deactivation Register */ +#define LTQ_SYSCTL_DEACT 0x0028 +/* reboot Register */ +#define LTQ_SYSCTL_RBT 0x002c +/* CPU0 Clock Control Register */ +#define LTQ_SYS1_CPU0CC 0x0040 +/* clock divider bit */ +#define LTQ_CPU0CC_CPUDIV 0x0001 + +static struct resource ltq_sysctl_res[] = { + MEM_RES("sys1", LTQ_SYS1_BASE_ADDR, LTQ_SYS1_SIZE), + MEM_RES("syseth", LTQ_SYS_ETH_BASE_ADDR, LTQ_SYS_ETH_SIZE), + MEM_RES("sysgpe", LTQ_SYS_GPE_BASE_ADDR, LTQ_SYS_GPE_SIZE), +}; + +static struct resource ltq_status_res = + MEM_RES("status", LTQ_STATUS_BASE_ADDR, LTQ_STATUS_SIZE); +static struct resource ltq_ebu_res = + MEM_RES("ebu", LTQ_EBU_BASE_ADDR, LTQ_EBU_SIZE); + +static void __iomem *ltq_sysctl[3]; +static void __iomem *ltq_status_membase; +void __iomem *ltq_sys1_membase; +void __iomem *ltq_ebu_membase; + +#define ltq_reg_w32(m, x, y) ltq_w32((x), ltq_sysctl[m] + (y)) +#define ltq_reg_r32(m, x) ltq_r32(ltq_sysctl[m] + (x)) +#define ltq_reg_w32_mask(m, clear, set, reg) \ + ltq_reg_w32(m, (ltq_reg_r32(m, reg) & ~(clear)) | (set), reg) + +#define ltq_status_w32(x, y) ltq_w32((x), ltq_status_membase + (y)) +#define ltq_status_r32(x) ltq_r32(ltq_status_membase + (x)) + +static inline void +ltq_sysctl_wait(struct clk *clk, + unsigned int test, unsigned int reg) +{ + int err = 1000000; + + do {} while (--err && ((ltq_reg_r32(clk->module, reg) + & clk->bits) != test)); + if (!err) + pr_err("module de/activation failed %d %08X %08X %08X\n", + clk->module, clk->bits, test, + ltq_reg_r32(clk->module, reg) & clk->bits); +} + +static int +ltq_sysctl_activate(struct clk *clk) +{ + ltq_reg_w32(clk->module, clk->bits, LTQ_SYSCTL_CLKEN); + ltq_reg_w32(clk->module, clk->bits, LTQ_SYSCTL_ACT); + ltq_sysctl_wait(clk, clk->bits, LTQ_SYSCTL_ACTS); + return 0; +} + +static void +ltq_sysctl_deactivate(struct clk *clk) +{ + ltq_reg_w32(clk->module, clk->bits, LTQ_SYSCTL_CLKCLR); + ltq_reg_w32(clk->module, clk->bits, LTQ_SYSCTL_DEACT); + ltq_sysctl_wait(clk, 0, LTQ_SYSCTL_ACTS); +} + +static int +ltq_sysctl_clken(struct clk *clk) +{ + ltq_reg_w32(clk->module, clk->bits, LTQ_SYSCTL_CLKEN); + ltq_sysctl_wait(clk, clk->bits, LTQ_SYSCTL_CLKS); + return 0; +} + +static void +ltq_sysctl_clkdis(struct clk *clk) +{ + ltq_reg_w32(clk->module, clk->bits, LTQ_SYSCTL_CLKCLR); + ltq_sysctl_wait(clk, 0, LTQ_SYSCTL_CLKS); +} + +static void +ltq_sysctl_reboot(struct clk *clk) +{ + unsigned int act; + unsigned int bits; + + act = ltq_reg_r32(clk->module, LTQ_SYSCTL_ACT); + bits = ~act & clk->bits; + if (bits != 0) { + ltq_reg_w32(clk->module, bits, LTQ_SYSCTL_CLKEN); + ltq_reg_w32(clk->module, bits, LTQ_SYSCTL_ACT); + ltq_sysctl_wait(clk, bits, LTQ_SYSCTL_ACTS); + } + ltq_reg_w32(clk->module, act & clk->bits, LTQ_SYSCTL_RBT); + ltq_sysctl_wait(clk, clk->bits, LTQ_SYSCTL_ACTS); +} + +/* enable the ONU core */ +static void +ltq_gpe_enable(void) +{ + unsigned int freq; + unsigned int status; + + /* if if the clock is already enabled */ + status = ltq_reg_r32(SYSCTL_SYS1, SYS1_INFRAC); + if (status & (1 << (GPPC_OFFSET + 1))) + return; + + if (ltq_status_r32(STATUS_CONFIG) == 0) + freq = 1; /* use 625MHz on unfused chip */ + else + freq = (ltq_status_r32(STATUS_CONFIG) & + GPEFREQ_MASK) >> + GPEFREQ_OFFSET; + + /* apply new frequency */ + ltq_reg_w32_mask(SYSCTL_SYS1, 7 << (GPPC_OFFSET + 1), + freq << (GPPC_OFFSET + 2) , SYS1_INFRAC); + udelay(1); + + /* enable new frequency */ + ltq_reg_w32_mask(SYSCTL_SYS1, 0, 1 << (GPPC_OFFSET + 1), SYS1_INFRAC); + udelay(1); +} + +static inline void +clkdev_add_sys(const char *dev, unsigned int module, + unsigned int bits) +{ + struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL); + + clk->cl.dev_id = dev; + clk->cl.con_id = NULL; + clk->cl.clk = clk; + clk->module = module; + clk->bits = bits; + clk->activate = ltq_sysctl_activate; + clk->deactivate = ltq_sysctl_deactivate; + clk->enable = ltq_sysctl_clken; + clk->disable = ltq_sysctl_clkdis; + clk->reboot = ltq_sysctl_reboot; + clkdev_add(&clk->cl); +} + +void __init +ltq_soc_init(void) +{ + int i; + + for (i = 0; i < 3; i++) + ltq_sysctl[i] = ltq_remap_resource(<q_sysctl_res[i]); + + ltq_sys1_membase = ltq_sysctl[0]; + ltq_status_membase = ltq_remap_resource(<q_status_res); + ltq_ebu_membase = ltq_remap_resource(<q_ebu_res); + + ltq_gpe_enable(); + + /* get our 3 static rates for cpu, fpi and io clocks */ + if (ltq_sys1_r32(LTQ_SYS1_CPU0CC) & LTQ_CPU0CC_CPUDIV) + clkdev_add_static(CLOCK_200M, CLOCK_100M, CLOCK_200M); + else + clkdev_add_static(CLOCK_400M, CLOCK_100M, CLOCK_200M); + + /* add our clock domains */ + clkdev_add_sys("falcon_gpio.0", SYSCTL_SYSETH, ACTS_PADCTRL0 | ACTS_P0); + clkdev_add_sys("falcon_gpio.1", SYSCTL_SYS1, ACTS_PADCTRL1 | ACTS_P1); + clkdev_add_sys("falcon_gpio.2", SYSCTL_SYSETH, ACTS_PADCTRL2 | ACTS_P2); + clkdev_add_sys("falcon_gpio.3", SYSCTL_SYS1, ACTS_PADCTRL3 | ACTS_P3); + clkdev_add_sys("falcon_gpio.4", SYSCTL_SYS1, ACTS_PADCTRL4 | ACTS_P4); + clkdev_add_sys("ltq_asc.1", SYSCTL_SYS1, ACTS_ASC1_ACT); + clkdev_add_sys("i2c-falcon.0", SYSCTL_SYS1, ACTS_I2C_ACT); +} |