1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ARC HSDK Platform support code
4 *
5 * Copyright (C) 2017 Synopsys, Inc. (www.synopsys.com)
6 */
7
8 #include <linux/init.h>
9 #include <linux/of_fdt.h>
10 #include <linux/libfdt.h>
11 #include <linux/smp.h>
12 #include <asm/arcregs.h>
13 #include <asm/io.h>
14 #include <asm/mach_desc.h>
15
16 int arc_hsdk_axi_dmac_coherent __section(".data") = 0;
17
18 #define ARC_CCM_UNUSED_ADDR 0x60000000
19
20
21 #define ARC_PERIPHERAL_BASE 0xf0000000
22 #define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000)
23
24 #define SDIO_BASE (ARC_PERIPHERAL_BASE + 0xA000)
25 #define SDIO_UHS_REG_EXT (SDIO_BASE + 0x108)
26 #define SDIO_UHS_REG_EXT_DIV_2 (2 << 30)
27
28 #define HSDK_GPIO_INTC (ARC_PERIPHERAL_BASE + 0x3000)
29
hsdk_enable_gpio_intc_wire(void)30 static void __init hsdk_enable_gpio_intc_wire(void)
31 {
32 /*
33 * Peripherals on CPU Card are wired to cpu intc via intermediate
34 * DW APB GPIO blocks (mainly for debouncing)
35 *
36 * ---------------------
37 * | snps,archs-intc |
38 * ---------------------
39 * |
40 * ----------------------
41 * | snps,archs-idu-intc |
42 * ----------------------
43 * | | | | |
44 * | [eth] [USB] [... other peripherals]
45 * |
46 * -------------------
47 * | snps,dw-apb-intc |
48 * -------------------
49 * | | | |
50 * [Bt] [HAPS] [... other peripherals]
51 *
52 * Current implementation of "irq-dw-apb-ictl" driver doesn't work well
53 * with stacked INTCs. In particular problem happens if its master INTC
54 * not yet instantiated. See discussion here -
55 * https://lore.kernel.org/lkml/54F6FE2C.7020309@synopsys.com
56 *
57 * So setup the first gpio block as a passive pass thru and hide it from
58 * DT hardware topology - connect intc directly to cpu intc
59 * The GPIO "wire" needs to be init nevertheless (here)
60 *
61 * One side adv is that peripheral interrupt handling avoids one nested
62 * intc ISR hop
63 *
64 * According to HSDK User's Manual [1], "Table 2 Interrupt Mapping"
65 * we have the following GPIO input lines used as sources of interrupt:
66 * - GPIO[0] - Bluetooth interrupt of RS9113 module
67 * - GPIO[2] - HAPS interrupt (on HapsTrak 3 connector)
68 * - GPIO[3] - Audio codec (MAX9880A) interrupt
69 * - GPIO[8-23] - Available on Arduino and PMOD_x headers
70 * For now there's no use of Arduino and PMOD_x headers in Linux
71 * use-case so we only enable lines 0, 2 and 3.
72 *
73 * [1] https://github.com/foss-for-synopsys-dwc-arc-processors/ARC-Development-Systems-Forum/wiki/docs/ARC_HSDK_User_Guide.pdf
74 */
75 #define GPIO_INTEN (HSDK_GPIO_INTC + 0x30)
76 #define GPIO_INTMASK (HSDK_GPIO_INTC + 0x34)
77 #define GPIO_INTTYPE_LEVEL (HSDK_GPIO_INTC + 0x38)
78 #define GPIO_INT_POLARITY (HSDK_GPIO_INTC + 0x3c)
79 #define GPIO_INT_CONNECTED_MASK 0x0d
80
81 iowrite32(0xffffffff, (void __iomem *) GPIO_INTMASK);
82 iowrite32(~GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTMASK);
83 iowrite32(0x00000000, (void __iomem *) GPIO_INTTYPE_LEVEL);
84 iowrite32(0xffffffff, (void __iomem *) GPIO_INT_POLARITY);
85 iowrite32(GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTEN);
86 }
87
hsdk_tweak_node_coherency(const char * path,bool coherent)88 static int __init hsdk_tweak_node_coherency(const char *path, bool coherent)
89 {
90 void *fdt = initial_boot_params;
91 const void *prop;
92 int node, ret;
93 bool dt_coh_set;
94
95 node = fdt_path_offset(fdt, path);
96 if (node < 0)
97 goto tweak_fail;
98
99 prop = fdt_getprop(fdt, node, "dma-coherent", &ret);
100 if (!prop && ret != -FDT_ERR_NOTFOUND)
101 goto tweak_fail;
102
103 dt_coh_set = ret != -FDT_ERR_NOTFOUND;
104 ret = 0;
105
106 /* need to remove "dma-coherent" property */
107 if (dt_coh_set && !coherent)
108 ret = fdt_delprop(fdt, node, "dma-coherent");
109
110 /* need to set "dma-coherent" property */
111 if (!dt_coh_set && coherent)
112 ret = fdt_setprop(fdt, node, "dma-coherent", NULL, 0);
113
114 if (ret < 0)
115 goto tweak_fail;
116
117 return 0;
118
119 tweak_fail:
120 pr_err("failed to tweak %s to %scoherent\n", path, coherent ? "" : "non");
121 return -EFAULT;
122 }
123
124 enum hsdk_axi_masters {
125 M_HS_CORE = 0,
126 M_HS_RTT,
127 M_AXI_TUN,
128 M_HDMI_VIDEO,
129 M_HDMI_AUDIO,
130 M_USB_HOST,
131 M_ETHERNET,
132 M_SDIO,
133 M_GPU,
134 M_DMAC_0,
135 M_DMAC_1,
136 M_DVFS
137 };
138
139 #define UPDATE_VAL 1
140
141 /*
142 * This is modified configuration of AXI bridge. Default settings
143 * are specified in "Table 111 CREG Address Decoder register reset values".
144 *
145 * AXI_M_m_SLV{0|1} - Slave Select register for master 'm'.
146 * Possible slaves are:
147 * - 0 => no slave selected
148 * - 1 => DDR controller port #1
149 * - 2 => SRAM controller
150 * - 3 => AXI tunnel
151 * - 4 => EBI controller
152 * - 5 => ROM controller
153 * - 6 => AXI2APB bridge
154 * - 7 => DDR controller port #2
155 * - 8 => DDR controller port #3
156 * - 9 => HS38x4 IOC
157 * - 10 => HS38x4 DMI
158 * AXI_M_m_OFFSET{0|1} - Addr Offset register for master 'm'
159 *
160 * Please read ARC HS Development IC Specification, section 17.2 for more
161 * information about apertures configuration.
162 *
163 * m master AXI_M_m_SLV0 AXI_M_m_SLV1 AXI_M_m_OFFSET0 AXI_M_m_OFFSET1
164 * 0 HS (CBU) 0x11111111 0x63111111 0xFEDCBA98 0x0E543210
165 * 1 HS (RTT) 0x77777777 0x77777777 0xFEDCBA98 0x76543210
166 * 2 AXI Tunnel 0x88888888 0x88888888 0xFEDCBA98 0x76543210
167 * 3 HDMI-VIDEO 0x77777777 0x77777777 0xFEDCBA98 0x76543210
168 * 4 HDMI-ADUIO 0x77777777 0x77777777 0xFEDCBA98 0x76543210
169 * 5 USB-HOST 0x77777777 0x77999999 0xFEDCBA98 0x76DCBA98
170 * 6 ETHERNET 0x77777777 0x77999999 0xFEDCBA98 0x76DCBA98
171 * 7 SDIO 0x77777777 0x77999999 0xFEDCBA98 0x76DCBA98
172 * 8 GPU 0x77777777 0x77777777 0xFEDCBA98 0x76543210
173 * 9 DMAC (port #1) 0x77777777 0x77777777 0xFEDCBA98 0x76543210
174 * 10 DMAC (port #2) 0x77777777 0x77777777 0xFEDCBA98 0x76543210
175 * 11 DVFS 0x00000000 0x60000000 0x00000000 0x00000000
176 */
177
178 #define CREG_AXI_M_SLV0(m) ((void __iomem *)(CREG_BASE + 0x20 * (m)))
179 #define CREG_AXI_M_SLV1(m) ((void __iomem *)(CREG_BASE + 0x20 * (m) + 0x04))
180 #define CREG_AXI_M_OFT0(m) ((void __iomem *)(CREG_BASE + 0x20 * (m) + 0x08))
181 #define CREG_AXI_M_OFT1(m) ((void __iomem *)(CREG_BASE + 0x20 * (m) + 0x0C))
182 #define CREG_AXI_M_UPDT(m) ((void __iomem *)(CREG_BASE + 0x20 * (m) + 0x14))
183
184 #define CREG_AXI_M_HS_CORE_BOOT ((void __iomem *)(CREG_BASE + 0x010))
185
186 #define CREG_PAE ((void __iomem *)(CREG_BASE + 0x180))
187 #define CREG_PAE_UPDT ((void __iomem *)(CREG_BASE + 0x194))
188
hsdk_init_memory_bridge_axi_dmac(void)189 static void __init hsdk_init_memory_bridge_axi_dmac(void)
190 {
191 bool coherent = !!arc_hsdk_axi_dmac_coherent;
192 u32 axi_m_slv1, axi_m_oft1;
193
194 /*
195 * Don't tweak memory bridge configuration if we failed to tweak DTB
196 * as we will end up in a inconsistent state.
197 */
198 if (hsdk_tweak_node_coherency("/soc/dmac@80000", coherent))
199 return;
200
201 if (coherent) {
202 axi_m_slv1 = 0x77999999;
203 axi_m_oft1 = 0x76DCBA98;
204 } else {
205 axi_m_slv1 = 0x77777777;
206 axi_m_oft1 = 0x76543210;
207 }
208
209 writel(0x77777777, CREG_AXI_M_SLV0(M_DMAC_0));
210 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_DMAC_0));
211 writel(axi_m_slv1, CREG_AXI_M_SLV1(M_DMAC_0));
212 writel(axi_m_oft1, CREG_AXI_M_OFT1(M_DMAC_0));
213 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DMAC_0));
214
215 writel(0x77777777, CREG_AXI_M_SLV0(M_DMAC_1));
216 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_DMAC_1));
217 writel(axi_m_slv1, CREG_AXI_M_SLV1(M_DMAC_1));
218 writel(axi_m_oft1, CREG_AXI_M_OFT1(M_DMAC_1));
219 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DMAC_1));
220 }
221
hsdk_init_memory_bridge(void)222 static void __init hsdk_init_memory_bridge(void)
223 {
224 u32 reg;
225
226 /*
227 * M_HS_CORE has one unique register - BOOT.
228 * We need to clean boot mirror (BOOT[1:0]) bits in them to avoid first
229 * aperture to be masked by 'boot mirror'.
230 */
231 reg = readl(CREG_AXI_M_HS_CORE_BOOT) & (~0x3);
232 writel(reg, CREG_AXI_M_HS_CORE_BOOT);
233 writel(0x11111111, CREG_AXI_M_SLV0(M_HS_CORE));
234 writel(0x63111111, CREG_AXI_M_SLV1(M_HS_CORE));
235 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_HS_CORE));
236 writel(0x0E543210, CREG_AXI_M_OFT1(M_HS_CORE));
237 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_HS_CORE));
238
239 writel(0x77777777, CREG_AXI_M_SLV0(M_HS_RTT));
240 writel(0x77777777, CREG_AXI_M_SLV1(M_HS_RTT));
241 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_HS_RTT));
242 writel(0x76543210, CREG_AXI_M_OFT1(M_HS_RTT));
243 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_HS_RTT));
244
245 writel(0x88888888, CREG_AXI_M_SLV0(M_AXI_TUN));
246 writel(0x88888888, CREG_AXI_M_SLV1(M_AXI_TUN));
247 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_AXI_TUN));
248 writel(0x76543210, CREG_AXI_M_OFT1(M_AXI_TUN));
249 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_AXI_TUN));
250
251 writel(0x77777777, CREG_AXI_M_SLV0(M_HDMI_VIDEO));
252 writel(0x77777777, CREG_AXI_M_SLV1(M_HDMI_VIDEO));
253 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_HDMI_VIDEO));
254 writel(0x76543210, CREG_AXI_M_OFT1(M_HDMI_VIDEO));
255 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_HDMI_VIDEO));
256
257 writel(0x77777777, CREG_AXI_M_SLV0(M_HDMI_AUDIO));
258 writel(0x77777777, CREG_AXI_M_SLV1(M_HDMI_AUDIO));
259 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_HDMI_AUDIO));
260 writel(0x76543210, CREG_AXI_M_OFT1(M_HDMI_AUDIO));
261 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_HDMI_AUDIO));
262
263 writel(0x77777777, CREG_AXI_M_SLV0(M_USB_HOST));
264 writel(0x77999999, CREG_AXI_M_SLV1(M_USB_HOST));
265 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_USB_HOST));
266 writel(0x76DCBA98, CREG_AXI_M_OFT1(M_USB_HOST));
267 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_USB_HOST));
268
269 writel(0x77777777, CREG_AXI_M_SLV0(M_ETHERNET));
270 writel(0x77999999, CREG_AXI_M_SLV1(M_ETHERNET));
271 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_ETHERNET));
272 writel(0x76DCBA98, CREG_AXI_M_OFT1(M_ETHERNET));
273 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_ETHERNET));
274
275 writel(0x77777777, CREG_AXI_M_SLV0(M_SDIO));
276 writel(0x77999999, CREG_AXI_M_SLV1(M_SDIO));
277 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_SDIO));
278 writel(0x76DCBA98, CREG_AXI_M_OFT1(M_SDIO));
279 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_SDIO));
280
281 writel(0x77777777, CREG_AXI_M_SLV0(M_GPU));
282 writel(0x77777777, CREG_AXI_M_SLV1(M_GPU));
283 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_GPU));
284 writel(0x76543210, CREG_AXI_M_OFT1(M_GPU));
285 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_GPU));
286
287 writel(0x00000000, CREG_AXI_M_SLV0(M_DVFS));
288 writel(0x60000000, CREG_AXI_M_SLV1(M_DVFS));
289 writel(0x00000000, CREG_AXI_M_OFT0(M_DVFS));
290 writel(0x00000000, CREG_AXI_M_OFT1(M_DVFS));
291 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DVFS));
292
293 hsdk_init_memory_bridge_axi_dmac();
294
295 /*
296 * PAE remapping for DMA clients does not work due to an RTL bug, so
297 * CREG_PAE register must be programmed to all zeroes, otherwise it
298 * will cause problems with DMA to/from peripherals even if PAE40 is
299 * not used.
300 */
301 writel(0x00000000, CREG_PAE);
302 writel(UPDATE_VAL, CREG_PAE_UPDT);
303 }
304
hsdk_init_early(void)305 static void __init hsdk_init_early(void)
306 {
307 hsdk_init_memory_bridge();
308
309 /*
310 * Switch SDIO external ciu clock divider from default div-by-8 to
311 * minimum possible div-by-2.
312 */
313 iowrite32(SDIO_UHS_REG_EXT_DIV_2, (void __iomem *) SDIO_UHS_REG_EXT);
314
315 hsdk_enable_gpio_intc_wire();
316 }
317
318 static const char *hsdk_compat[] __initconst = {
319 "snps,hsdk",
320 NULL,
321 };
322
323 MACHINE_START(SIMULATION, "hsdk")
324 .dt_compat = hsdk_compat,
325 .init_early = hsdk_init_early,
326 MACHINE_END
327