Linus Walleij | 70ee657 | 2012-11-20 22:39:49 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Clock driver for the ARM Integrator/IM-PD1 board |
| 3 | * Copyright (C) 2012 Linus Walleij |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | #include <linux/clk-provider.h> |
| 10 | #include <linux/clk.h> |
| 11 | #include <linux/clkdev.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/io.h> |
| 14 | #include <linux/platform_data/clk-integrator.h> |
| 15 | |
| 16 | #include <mach/impd1.h> |
| 17 | |
| 18 | #include "clk-icst.h" |
| 19 | |
| 20 | struct impd1_clk { |
| 21 | struct clk *vcoclk; |
| 22 | struct clk *uartclk; |
| 23 | struct clk_lookup *clks[3]; |
| 24 | }; |
| 25 | |
| 26 | static struct impd1_clk impd1_clks[4]; |
| 27 | |
| 28 | /* |
| 29 | * There are two VCO's on the IM-PD1 but only one is used by the |
| 30 | * kernel, that is why we are only implementing the control of |
| 31 | * IMPD1_OSC1 here. |
| 32 | */ |
| 33 | |
| 34 | static const struct icst_params impd1_vco_params = { |
| 35 | .ref = 24000000, /* 24 MHz */ |
| 36 | .vco_max = ICST525_VCO_MAX_3V, |
| 37 | .vco_min = ICST525_VCO_MIN, |
| 38 | .vd_min = 12, |
| 39 | .vd_max = 519, |
| 40 | .rd_min = 3, |
| 41 | .rd_max = 120, |
| 42 | .s2div = icst525_s2div, |
| 43 | .idx2s = icst525_idx2s, |
| 44 | }; |
| 45 | |
| 46 | static const struct clk_icst_desc impd1_icst1_desc = { |
| 47 | .params = &impd1_vco_params, |
| 48 | .vco_offset = IMPD1_OSC1, |
| 49 | .lock_offset = IMPD1_LOCK, |
| 50 | }; |
| 51 | |
| 52 | /** |
| 53 | * integrator_impd1_clk_init() - set up the integrator clock tree |
| 54 | * @base: base address of the logic module (LM) |
| 55 | * @id: the ID of this LM |
| 56 | */ |
| 57 | void integrator_impd1_clk_init(void __iomem *base, unsigned int id) |
| 58 | { |
| 59 | struct impd1_clk *imc; |
| 60 | struct clk *clk; |
| 61 | int i; |
| 62 | |
| 63 | if (id > 3) { |
| 64 | pr_crit("no more than 4 LMs can be attached\n"); |
| 65 | return; |
| 66 | } |
| 67 | imc = &impd1_clks[id]; |
| 68 | |
| 69 | clk = icst_clk_register(NULL, &impd1_icst1_desc, base); |
| 70 | imc->vcoclk = clk; |
| 71 | imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id); |
| 72 | |
| 73 | /* UART reference clock */ |
| 74 | clk = clk_register_fixed_rate(NULL, "uartclk", NULL, CLK_IS_ROOT, |
| 75 | 14745600); |
| 76 | imc->uartclk = clk; |
| 77 | imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00100", id); |
| 78 | imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00200", id); |
| 79 | |
| 80 | for (i = 0; i < ARRAY_SIZE(imc->clks); i++) |
| 81 | clkdev_add(imc->clks[i]); |
| 82 | } |
| 83 | |
| 84 | void integrator_impd1_clk_exit(unsigned int id) |
| 85 | { |
| 86 | int i; |
| 87 | struct impd1_clk *imc; |
| 88 | |
| 89 | if (id > 3) |
| 90 | return; |
| 91 | imc = &impd1_clks[id]; |
| 92 | |
| 93 | for (i = 0; i < ARRAY_SIZE(imc->clks); i++) |
| 94 | clkdev_drop(imc->clks[i]); |
| 95 | clk_unregister(imc->uartclk); |
| 96 | clk_unregister(imc->vcoclk); |
| 97 | } |